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android / platform / libcore / dec22baf4d9 / . / hotspot / src / share / vm / classfile / classFileParser.cpp
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/*
* Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#include "classfile/classFileParser.hpp"
#include "classfile/classFileStream.hpp"
#include "classfile/classLoader.hpp"
#include "classfile/classLoaderData.inline.hpp"
#include "classfile/defaultMethods.hpp"
#include "classfile/javaClasses.inline.hpp"
#include "classfile/moduleEntry.hpp"
#include "classfile/symbolTable.hpp"
#include "classfile/systemDictionary.hpp"
#include "classfile/verificationType.hpp"
#include "classfile/verifier.hpp"
#include "classfile/vmSymbols.hpp"
#include "gc/shared/gcLocker.hpp"
#include "logging/log.hpp"
#include "memory/allocation.hpp"
#include "memory/metadataFactory.hpp"
#include "memory/oopFactory.hpp"
#include "memory/resourceArea.hpp"
#include "memory/universe.inline.hpp"
#include "oops/annotations.hpp"
#include "oops/fieldStreams.hpp"
#include "oops/instanceKlass.hpp"
#include "oops/instanceMirrorKlass.hpp"
#include "oops/klass.inline.hpp"
#include "oops/klassVtable.hpp"
#include "oops/metadata.hpp"
#include "oops/method.hpp"
#include "oops/oop.inline.hpp"
#include "oops/symbol.hpp"
#include "prims/jvm.h"
#include "prims/jvmtiExport.hpp"
#include "prims/jvmtiThreadState.hpp"
#include "runtime/javaCalls.hpp"
#include "runtime/perfData.hpp"
#include "runtime/reflection.hpp"
#include "runtime/signature.hpp"
#include "runtime/timer.hpp"
#include "services/classLoadingService.hpp"
#include "services/threadService.hpp"
#include "trace/traceMacros.hpp"
#include "utilities/array.hpp"
#include "utilities/exceptions.hpp"
#include "utilities/globalDefinitions.hpp"
#include "utilities/macros.hpp"
#include "utilities/ostream.hpp"
#include "utilities/resourceHash.hpp"
#if INCLUDE_CDS
#include "classfile/systemDictionaryShared.hpp"
#endif
// We generally try to create the oops directly when parsing, rather than
// allocating temporary data structures and copying the bytes twice. A
// temporary area is only needed when parsing utf8 entries in the constant
// pool and when parsing line number tables.
// We add assert in debug mode when class format is not checked.
#define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
#define JAVA_MIN_SUPPORTED_VERSION 45
#define JAVA_MAX_SUPPORTED_VERSION 53
#define JAVA_MAX_SUPPORTED_MINOR_VERSION 0
// Used for two backward compatibility reasons:
// - to check for new additions to the class file format in JDK1.5
// - to check for bug fixes in the format checker in JDK1.5
#define JAVA_1_5_VERSION 49
// Used for backward compatibility reasons:
// - to check for javac bug fixes that happened after 1.5
// - also used as the max version when running in jdk6
#define JAVA_6_VERSION 50
// Used for backward compatibility reasons:
// - to check NameAndType_info signatures more aggressively
// - to disallow argument and require ACC_STATIC for <clinit> methods
#define JAVA_7_VERSION 51
// Extension method support.
#define JAVA_8_VERSION 52
#define JAVA_9_VERSION 53
void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
ConstantPool* cp,
const int length,
TRAPS) {
assert(stream != NULL, "invariant");
assert(cp != NULL, "invariant");
// Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
// this function (_current can be allocated in a register, with scalar
// replacement of aggregates). The _current pointer is copied back to
// stream() when this function returns. DON'T call another method within
// this method that uses stream().
const ClassFileStream cfs1 = *stream;
const ClassFileStream* const cfs = &cfs1;
assert(cfs->allocated_on_stack(), "should be local");
debug_only(const u1* const old_current = stream->current();)
// Used for batching symbol allocations.
const char* names[SymbolTable::symbol_alloc_batch_size];
int lengths[SymbolTable::symbol_alloc_batch_size];
int indices[SymbolTable::symbol_alloc_batch_size];
unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
int names_count = 0;
// parsing Index 0 is unused
for (int index = 1; index < length; index++) {
// Each of the following case guarantees one more byte in the stream
// for the following tag or the access_flags following constant pool,
// so we don't need bounds-check for reading tag.
const u1 tag = cfs->get_u1_fast();
switch (tag) {
case JVM_CONSTANT_Class : {
cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
const u2 name_index = cfs->get_u2_fast();
cp->klass_index_at_put(index, name_index);
break;
}
case JVM_CONSTANT_Fieldref: {
cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
const u2 class_index = cfs->get_u2_fast();
const u2 name_and_type_index = cfs->get_u2_fast();
cp->field_at_put(index, class_index, name_and_type_index);
break;
}
case JVM_CONSTANT_Methodref: {
cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
const u2 class_index = cfs->get_u2_fast();
const u2 name_and_type_index = cfs->get_u2_fast();
cp->method_at_put(index, class_index, name_and_type_index);
break;
}
case JVM_CONSTANT_InterfaceMethodref: {
cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
const u2 class_index = cfs->get_u2_fast();
const u2 name_and_type_index = cfs->get_u2_fast();
cp->interface_method_at_put(index, class_index, name_and_type_index);
break;
}
case JVM_CONSTANT_String : {
cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags
const u2 string_index = cfs->get_u2_fast();
cp->string_index_at_put(index, string_index);
break;
}
case JVM_CONSTANT_MethodHandle :
case JVM_CONSTANT_MethodType: {
if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
classfile_parse_error(
"Class file version does not support constant tag %u in class file %s",
tag, CHECK);
}
if (tag == JVM_CONSTANT_MethodHandle) {
cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags
const u1 ref_kind = cfs->get_u1_fast();
const u2 method_index = cfs->get_u2_fast();
cp->method_handle_index_at_put(index, ref_kind, method_index);
}
else if (tag == JVM_CONSTANT_MethodType) {
cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags
const u2 signature_index = cfs->get_u2_fast();
cp->method_type_index_at_put(index, signature_index);
}
else {
ShouldNotReachHere();
}
break;
}
case JVM_CONSTANT_InvokeDynamic : {
if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
classfile_parse_error(
"Class file version does not support constant tag %u in class file %s",
tag, CHECK);
}
cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags
const u2 bootstrap_specifier_index = cfs->get_u2_fast();
const u2 name_and_type_index = cfs->get_u2_fast();
if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
_max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later
}
cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
break;
}
case JVM_CONSTANT_Integer: {
cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
const u4 bytes = cfs->get_u4_fast();
cp->int_at_put(index, (jint)bytes);
break;
}
case JVM_CONSTANT_Float: {
cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags
const u4 bytes = cfs->get_u4_fast();
cp->float_at_put(index, *(jfloat*)&bytes);
break;
}
case JVM_CONSTANT_Long: {
// A mangled type might cause you to overrun allocated memory
guarantee_property(index + 1 < length,
"Invalid constant pool entry %u in class file %s",
index,
CHECK);
cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
const u8 bytes = cfs->get_u8_fast();
cp->long_at_put(index, bytes);
index++; // Skip entry following eigth-byte constant, see JVM book p. 98
break;
}
case JVM_CONSTANT_Double: {
// A mangled type might cause you to overrun allocated memory
guarantee_property(index+1 < length,
"Invalid constant pool entry %u in class file %s",
index,
CHECK);
cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags
const u8 bytes = cfs->get_u8_fast();
cp->double_at_put(index, *(jdouble*)&bytes);
index++; // Skip entry following eigth-byte constant, see JVM book p. 98
break;
}
case JVM_CONSTANT_NameAndType: {
cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags
const u2 name_index = cfs->get_u2_fast();
const u2 signature_index = cfs->get_u2_fast();
cp->name_and_type_at_put(index, name_index, signature_index);
break;
}
case JVM_CONSTANT_Utf8 : {
cfs->guarantee_more(2, CHECK); // utf8_length
u2 utf8_length = cfs->get_u2_fast();
const u1* utf8_buffer = cfs->get_u1_buffer();
assert(utf8_buffer != NULL, "null utf8 buffer");
// Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags
cfs->skip_u1_fast(utf8_length);
// Before storing the symbol, make sure it's legal
if (_need_verify) {
verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
}
if (has_cp_patch_at(index)) {
Handle patch = clear_cp_patch_at(index);
guarantee_property(java_lang_String::is_instance(patch()),
"Illegal utf8 patch at %d in class file %s",
index,
CHECK);
const char* const str = java_lang_String::as_utf8_string(patch());
// (could use java_lang_String::as_symbol instead, but might as well batch them)
utf8_buffer = (const u1*) str;
utf8_length = (int) strlen(str);
}
unsigned int hash;
Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
utf8_length,
hash);
if (result == NULL) {
names[names_count] = (const char*)utf8_buffer;
lengths[names_count] = utf8_length;
indices[names_count] = index;
hashValues[names_count++] = hash;
if (names_count == SymbolTable::symbol_alloc_batch_size) {
SymbolTable::new_symbols(_loader_data,
cp,
names_count,
names,
lengths,
indices,
hashValues,
CHECK);
names_count = 0;
}
} else {
cp->symbol_at_put(index, result);
}
break;
}
default: {
classfile_parse_error("Unknown constant tag %u in class file %s",
tag,
CHECK);
break;
}
} // end of switch(tag)
} // end of for
// Allocate the remaining symbols
if (names_count > 0) {
SymbolTable::new_symbols(_loader_data,
cp,
names_count,
names,
lengths,
indices,
hashValues,
CHECK);
}
// Copy _current pointer of local copy back to stream.
assert(stream->current() == old_current, "non-exclusive use of stream");
stream->set_current(cfs1.current());
}
static inline bool valid_cp_range(int index, int length) {
return (index > 0 && index < length);
}
static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
assert(cp != NULL, "invariant");
if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
return cp->symbol_at(index);
}
return NULL;
}
#ifdef ASSERT
PRAGMA_DIAG_PUSH
PRAGMA_FORMAT_NONLITERAL_IGNORED
void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
ResourceMark rm(THREAD);
fatal(msg, _class_name->as_C_string());
}
void ClassFileParser::report_assert_property_failure(const char* msg,
int index,
TRAPS) const {
ResourceMark rm(THREAD);
fatal(msg, index, _class_name->as_C_string());
}
PRAGMA_DIAG_POP
#endif
void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
ConstantPool* const cp,
const int length,
TRAPS) {
assert(cp != NULL, "invariant");
assert(stream != NULL, "invariant");
// parsing constant pool entries
parse_constant_pool_entries(stream, cp, length, CHECK);
int index = 1; // declared outside of loops for portability
// first verification pass - validate cross references
// and fixup class and string constants
for (index = 1; index < length; index++) { // Index 0 is unused
const jbyte tag = cp->tag_at(index).value();
switch (tag) {
case JVM_CONSTANT_Class: {
ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
break;
}
case JVM_CONSTANT_Fieldref:
// fall through
case JVM_CONSTANT_Methodref:
// fall through
case JVM_CONSTANT_InterfaceMethodref: {
if (!_need_verify) break;
const int klass_ref_index = cp->klass_ref_index_at(index);
const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
check_property(valid_klass_reference_at(klass_ref_index),
"Invalid constant pool index %u in class file %s",
klass_ref_index, CHECK);
check_property(valid_cp_range(name_and_type_ref_index, length) &&
cp->tag_at(name_and_type_ref_index).is_name_and_type(),
"Invalid constant pool index %u in class file %s",
name_and_type_ref_index, CHECK);
break;
}
case JVM_CONSTANT_String: {
ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present
break;
}
case JVM_CONSTANT_Integer:
break;
case JVM_CONSTANT_Float:
break;
case JVM_CONSTANT_Long:
case JVM_CONSTANT_Double: {
index++;
check_property(
(index < length && cp->tag_at(index).is_invalid()),
"Improper constant pool long/double index %u in class file %s",
index, CHECK);
break;
}
case JVM_CONSTANT_NameAndType: {
if (!_need_verify) break;
const int name_ref_index = cp->name_ref_index_at(index);
const int signature_ref_index = cp->signature_ref_index_at(index);
check_property(valid_symbol_at(name_ref_index),
"Invalid constant pool index %u in class file %s",
name_ref_index, CHECK);
check_property(valid_symbol_at(signature_ref_index),
"Invalid constant pool index %u in class file %s",
signature_ref_index, CHECK);
break;
}
case JVM_CONSTANT_Utf8:
break;
case JVM_CONSTANT_UnresolvedClass: // fall-through
case JVM_CONSTANT_UnresolvedClassInError: {
ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
break;
}
case JVM_CONSTANT_ClassIndex: {
const int class_index = cp->klass_index_at(index);
check_property(valid_symbol_at(class_index),
"Invalid constant pool index %u in class file %s",
class_index, CHECK);
cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
break;
}
case JVM_CONSTANT_StringIndex: {
const int string_index = cp->string_index_at(index);
check_property(valid_symbol_at(string_index),
"Invalid constant pool index %u in class file %s",
string_index, CHECK);
Symbol* const sym = cp->symbol_at(string_index);
cp->unresolved_string_at_put(index, sym);
break;
}
case JVM_CONSTANT_MethodHandle: {
const int ref_index = cp->method_handle_index_at(index);
check_property(valid_cp_range(ref_index, length),
"Invalid constant pool index %u in class file %s",
ref_index, CHECK);
const constantTag tag = cp->tag_at(ref_index);
const int ref_kind = cp->method_handle_ref_kind_at(index);
switch (ref_kind) {
case JVM_REF_getField:
case JVM_REF_getStatic:
case JVM_REF_putField:
case JVM_REF_putStatic: {
check_property(
tag.is_field(),
"Invalid constant pool index %u in class file %s (not a field)",
ref_index, CHECK);
break;
}
case JVM_REF_invokeVirtual:
case JVM_REF_newInvokeSpecial: {
check_property(
tag.is_method(),
"Invalid constant pool index %u in class file %s (not a method)",
ref_index, CHECK);
break;
}
case JVM_REF_invokeStatic:
case JVM_REF_invokeSpecial: {
check_property(
tag.is_method() ||
((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
"Invalid constant pool index %u in class file %s (not a method)",
ref_index, CHECK);
break;
}
case JVM_REF_invokeInterface: {
check_property(
tag.is_interface_method(),
"Invalid constant pool index %u in class file %s (not an interface method)",
ref_index, CHECK);
break;
}
default: {
classfile_parse_error(
"Bad method handle kind at constant pool index %u in class file %s",
index, CHECK);
}
} // switch(refkind)
// Keep the ref_index unchanged. It will be indirected at link-time.
break;
} // case MethodHandle
case JVM_CONSTANT_MethodType: {
const int ref_index = cp->method_type_index_at(index);
check_property(valid_symbol_at(ref_index),
"Invalid constant pool index %u in class file %s",
ref_index, CHECK);
break;
}
case JVM_CONSTANT_InvokeDynamic: {
const int name_and_type_ref_index =
cp->invoke_dynamic_name_and_type_ref_index_at(index);
check_property(valid_cp_range(name_and_type_ref_index, length) &&
cp->tag_at(name_and_type_ref_index).is_name_and_type(),
"Invalid constant pool index %u in class file %s",
name_and_type_ref_index, CHECK);
// bootstrap specifier index must be checked later,
// when BootstrapMethods attr is available
break;
}
default: {
fatal("bad constant pool tag value %u", cp->tag_at(index).value());
ShouldNotReachHere();
break;
}
} // switch(tag)
} // end of for
if (_cp_patches != NULL) {
// need to treat this_class specially...
int this_class_index;
{
stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
const u1* const mark = stream->current();
stream->skip_u2_fast(1); // skip flags
this_class_index = stream->get_u2_fast();
stream->set_current(mark); // revert to mark
}
for (index = 1; index < length; index++) { // Index 0 is unused
if (has_cp_patch_at(index)) {
guarantee_property(index != this_class_index,
"Illegal constant pool patch to self at %d in class file %s",
index, CHECK);
patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
}
}
}
if (!_need_verify) {
return;
}
// second verification pass - checks the strings are of the right format.
// but not yet to the other entries
for (index = 1; index < length; index++) {
const jbyte tag = cp->tag_at(index).value();
switch (tag) {
case JVM_CONSTANT_UnresolvedClass: {
const Symbol* const class_name = cp->klass_name_at(index);
// check the name, even if _cp_patches will overwrite it
verify_legal_class_name(class_name, CHECK);
break;
}
case JVM_CONSTANT_NameAndType: {
if (_need_verify && _major_version >= JAVA_7_VERSION) {
const int sig_index = cp->signature_ref_index_at(index);
const int name_index = cp->name_ref_index_at(index);
const Symbol* const name = cp->symbol_at(name_index);
const Symbol* const sig = cp->symbol_at(sig_index);
guarantee_property(sig->utf8_length() != 0,
"Illegal zero length constant pool entry at %d in class %s",
sig_index, CHECK);
if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
verify_legal_method_signature(name, sig, CHECK);
} else {
verify_legal_field_signature(name, sig, CHECK);
}
}
break;
}
case JVM_CONSTANT_InvokeDynamic:
case JVM_CONSTANT_Fieldref:
case JVM_CONSTANT_Methodref:
case JVM_CONSTANT_InterfaceMethodref: {
const int name_and_type_ref_index =
cp->name_and_type_ref_index_at(index);
// already verified to be utf8
const int name_ref_index =
cp->name_ref_index_at(name_and_type_ref_index);
// already verified to be utf8
const int signature_ref_index =
cp->signature_ref_index_at(name_and_type_ref_index);
const Symbol* const name = cp->symbol_at(name_ref_index);
const Symbol* const signature = cp->symbol_at(signature_ref_index);
if (tag == JVM_CONSTANT_Fieldref) {
verify_legal_field_name(name, CHECK);
if (_need_verify && _major_version >= JAVA_7_VERSION) {
// Signature is verified above, when iterating NameAndType_info.
// Need only to be sure it's non-zero length and the right type.
if (signature->utf8_length() == 0 ||
signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
throwIllegalSignature(
"Field", name, signature, CHECK);
}
} else {
verify_legal_field_signature(name, signature, CHECK);
}
} else {
verify_legal_method_name(name, CHECK);
if (_need_verify && _major_version >= JAVA_7_VERSION) {
// Signature is verified above, when iterating NameAndType_info.
// Need only to be sure it's non-zero length and the right type.
if (signature->utf8_length() == 0 ||
signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
throwIllegalSignature(
"Method", name, signature, CHECK);
}
} else {
verify_legal_method_signature(name, signature, CHECK);
}
if (tag == JVM_CONSTANT_Methodref) {
// 4509014: If a class method name begins with '<', it must be "<init>".
assert(name != NULL, "method name in constant pool is null");
const unsigned int name_len = name->utf8_length();
if (name_len != 0 && name->byte_at(0) == '<') {
if (name != vmSymbols::object_initializer_name()) {
classfile_parse_error(
"Bad method name at constant pool index %u in class file %s",
name_ref_index, CHECK);
}
}
}
}
break;
}
case JVM_CONSTANT_MethodHandle: {
const int ref_index = cp->method_handle_index_at(index);
const int ref_kind = cp->method_handle_ref_kind_at(index);
switch (ref_kind) {
case JVM_REF_invokeVirtual:
case JVM_REF_invokeStatic:
case JVM_REF_invokeSpecial:
case JVM_REF_newInvokeSpecial: {
const int name_and_type_ref_index =
cp->name_and_type_ref_index_at(ref_index);
const int name_ref_index =
cp->name_ref_index_at(name_and_type_ref_index);
const Symbol* const name = cp->symbol_at(name_ref_index);
if (ref_kind == JVM_REF_newInvokeSpecial) {
if (name != vmSymbols::object_initializer_name()) {
classfile_parse_error(
"Bad constructor name at constant pool index %u in class file %s",
name_ref_index, CHECK);
}
} else {
if (name == vmSymbols::object_initializer_name()) {
classfile_parse_error(
"Bad method name at constant pool index %u in class file %s",
name_ref_index, CHECK);
}
}
break;
}
// Other ref_kinds are already fully checked in previous pass.
} // switch(ref_kind)
break;
}
case JVM_CONSTANT_MethodType: {
const Symbol* const no_name = vmSymbols::type_name(); // place holder
const Symbol* const signature = cp->method_type_signature_at(index);
verify_legal_method_signature(no_name, signature, CHECK);
break;
}
case JVM_CONSTANT_Utf8: {
assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
}
} // switch(tag)
} // end of for
}
void ClassFileParser::patch_constant_pool(ConstantPool* cp,
int index,
Handle patch,
TRAPS) {
assert(cp != NULL, "invariant");
BasicType patch_type = T_VOID;
switch (cp->tag_at(index).value()) {
case JVM_CONSTANT_UnresolvedClass: {
// Patching a class means pre-resolving it.
// The name in the constant pool is ignored.
if (java_lang_Class::is_instance(patch())) {
guarantee_property(!java_lang_Class::is_primitive(patch()),
"Illegal class patch at %d in class file %s",
index, CHECK);
cp->klass_at_put(index, java_lang_Class::as_Klass(patch()));
} else {
guarantee_property(java_lang_String::is_instance(patch()),
"Illegal class patch at %d in class file %s",
index, CHECK);
Symbol* const name = java_lang_String::as_symbol(patch(), CHECK);
cp->unresolved_klass_at_put(index, name);
}
break;
}
case JVM_CONSTANT_String: {
// skip this patch and don't clear it. Needs the oop array for resolved
// references to be created first.
return;
}
case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim;
case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim;
case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim;
case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim;
patch_prim:
{
jvalue value;
BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
guarantee_property(value_type == patch_type,
"Illegal primitive patch at %d in class file %s",
index, CHECK);
switch (value_type) {
case T_INT: cp->int_at_put(index, value.i); break;
case T_FLOAT: cp->float_at_put(index, value.f); break;
case T_LONG: cp->long_at_put(index, value.j); break;
case T_DOUBLE: cp->double_at_put(index, value.d); break;
default: assert(false, "");
}
} // end patch_prim label
break;
default: {
// %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
guarantee_property(!has_cp_patch_at(index),
"Illegal unexpected patch at %d in class file %s",
index, CHECK);
return;
}
} // end of switch(tag)
// On fall-through, mark the patch as used.
clear_cp_patch_at(index);
}
class NameSigHash: public ResourceObj {
public:
const Symbol* _name; // name
const Symbol* _sig; // signature
NameSigHash* _next; // Next entry in hash table
};
static const int HASH_ROW_SIZE = 256;
static unsigned int hash(const Symbol* name, const Symbol* sig) {
unsigned int raw_hash = 0;
raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
}
static void initialize_hashtable(NameSigHash** table) {
memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
}
// Return false if the name/sig combination is found in table.
// Return true if no duplicate is found. And name/sig is added as a new entry in table.
// The old format checker uses heap sort to find duplicates.
// NOTE: caller should guarantee that GC doesn't happen during the life cycle
// of table since we don't expect Symbol*'s to move.
static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
assert(name != NULL, "name in constant pool is NULL");
// First lookup for duplicates
int index = hash(name, sig);
NameSigHash* entry = table[index];
while (entry != NULL) {
if (entry->_name == name && entry->_sig == sig) {
return false;
}
entry = entry->_next;
}
// No duplicate is found, allocate a new entry and fill it.
entry = new NameSigHash();
entry->_name = name;
entry->_sig = sig;
// Insert into hash table
entry->_next = table[index];
table[index] = entry;
return true;
}
// Side-effects: populates the _local_interfaces field
void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
const int itfs_len,
ConstantPool* const cp,
bool* const has_default_methods,
TRAPS) {
assert(stream != NULL, "invariant");
assert(cp != NULL, "invariant");
assert(has_default_methods != NULL, "invariant");
if (itfs_len == 0) {
_local_interfaces = Universe::the_empty_klass_array();
} else {
assert(itfs_len > 0, "only called for len>0");
_local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, itfs_len, NULL, CHECK);
int index;
for (index = 0; index < itfs_len; index++) {
const u2 interface_index = stream->get_u2(CHECK);
KlassHandle interf;
check_property(
valid_klass_reference_at(interface_index),
"Interface name has bad constant pool index %u in class file %s",
interface_index, CHECK);
if (cp->tag_at(interface_index).is_klass()) {
interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
} else {
Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
// Don't need to check legal name because it's checked when parsing constant pool.
// But need to make sure it's not an array type.
guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
"Bad interface name in class file %s", CHECK);
// Call resolve_super so classcircularity is checked
const Klass* const k =
SystemDictionary::resolve_super_or_fail(_class_name,
unresolved_klass,
_loader_data->class_loader(),
_protection_domain,
false,
CHECK);
interf = KlassHandle(THREAD, k);
}
if (!interf()->is_interface()) {
THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
"Implementing class");
}
if (InstanceKlass::cast(interf())->has_default_methods()) {
*has_default_methods = true;
}
_local_interfaces->at_put(index, interf());
}
if (!_need_verify || itfs_len <= 1) {
return;
}
// Check if there's any duplicates in interfaces
ResourceMark rm(THREAD);
NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
NameSigHash*,
HASH_ROW_SIZE);
initialize_hashtable(interface_names);
bool dup = false;
{
debug_only(NoSafepointVerifier nsv;)
for (index = 0; index < itfs_len; index++) {
const Klass* const k = _local_interfaces->at(index);
const Symbol* const name = InstanceKlass::cast(k)->name();
// If no duplicates, add (name, NULL) in hashtable interface_names.
if (!put_after_lookup(name, NULL, interface_names)) {
dup = true;
break;
}
}
}
if (dup) {
classfile_parse_error("Duplicate interface name in class file %s", CHECK);
}
}
}
void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
int constantvalue_index,
int signature_index,
TRAPS) const {
// Make sure the constant pool entry is of a type appropriate to this field
guarantee_property(
(constantvalue_index > 0 &&
constantvalue_index < cp->length()),
"Bad initial value index %u in ConstantValue attribute in class file %s",
constantvalue_index, CHECK);
const constantTag value_type = cp->tag_at(constantvalue_index);
switch(cp->basic_type_for_signature_at(signature_index)) {
case T_LONG: {
guarantee_property(value_type.is_long(),
"Inconsistent constant value type in class file %s",
CHECK);
break;
}
case T_FLOAT: {
guarantee_property(value_type.is_float(),
"Inconsistent constant value type in class file %s",
CHECK);
break;
}
case T_DOUBLE: {
guarantee_property(value_type.is_double(),
"Inconsistent constant value type in class file %s",
CHECK);
break;
}
case T_BYTE:
case T_CHAR:
case T_SHORT:
case T_BOOLEAN:
case T_INT: {
guarantee_property(value_type.is_int(),
"Inconsistent constant value type in class file %s",
CHECK);
break;
}
case T_OBJECT: {
guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
&& value_type.is_string()),
"Bad string initial value in class file %s",
CHECK);
break;
}
default: {
classfile_parse_error("Unable to set initial value %u in class file %s",
constantvalue_index,
CHECK);
}
}
}
class AnnotationCollector : public ResourceObj{
public:
enum Location { _in_field, _in_method, _in_class };
enum ID {
_unknown = 0,
_method_CallerSensitive,
_method_ForceInline,
_method_DontInline,
_method_InjectedProfile,
_method_LambdaForm_Compiled,
_method_LambdaForm_Hidden,
_method_HotSpotIntrinsicCandidate,
_jdk_internal_vm_annotation_Contended,
_field_Stable,
_jdk_internal_vm_annotation_ReservedStackAccess,
_annotation_LIMIT
};
const Location _location;
int _annotations_present;
u2 _contended_group;
AnnotationCollector(Location location)
: _location(location), _annotations_present(0)
{
assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
}
// If this annotation name has an ID, report it (or _none).
ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
// Set the annotation name:
void set_annotation(ID id) {
assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
_annotations_present |= nth_bit((int)id);
}
void remove_annotation(ID id) {
assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
_annotations_present &= ~nth_bit((int)id);
}
// Report if the annotation is present.
bool has_any_annotations() const { return _annotations_present != 0; }
bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
void set_contended_group(u2 group) { _contended_group = group; }
u2 contended_group() const { return _contended_group; }
bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
void set_stable(bool stable) { set_annotation(_field_Stable); }
bool is_stable() const { return has_annotation(_field_Stable); }
};
// This class also doubles as a holder for metadata cleanup.
class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
private:
ClassLoaderData* _loader_data;
AnnotationArray* _field_annotations;
AnnotationArray* _field_type_annotations;
public:
FieldAnnotationCollector(ClassLoaderData* loader_data) :
AnnotationCollector(_in_field),
_loader_data(loader_data),
_field_annotations(NULL),
_field_type_annotations(NULL) {}
~FieldAnnotationCollector();
void apply_to(FieldInfo* f);
AnnotationArray* field_annotations() { return _field_annotations; }
AnnotationArray* field_type_annotations() { return _field_type_annotations; }
void set_field_annotations(AnnotationArray* a) { _field_annotations = a; }
void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
};
class MethodAnnotationCollector : public AnnotationCollector{
public:
MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
void apply_to(methodHandle m);
};
class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
public:
ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
void apply_to(InstanceKlass* ik);
};
static int skip_annotation_value(const u1*, int, int); // fwd decl
// Skip an annotation. Return >=limit if there is any problem.
static int skip_annotation(const u1* buffer, int limit, int index) {
assert(buffer != NULL, "invariant");
// annotation := atype:u2 do(nmem:u2) {member:u2 value}
// value := switch (tag:u1) { ... }
index += 2; // skip atype
if ((index += 2) >= limit) return limit; // read nmem
int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
while (--nmem >= 0 && index < limit) {
index += 2; // skip member
index = skip_annotation_value(buffer, limit, index);
}
return index;
}
// Skip an annotation value. Return >=limit if there is any problem.
static int skip_annotation_value(const u1* buffer, int limit, int index) {
assert(buffer != NULL, "invariant");
// value := switch (tag:u1) {
// case B, C, I, S, Z, D, F, J, c: con:u2;
// case e: e_class:u2 e_name:u2;
// case s: s_con:u2;
// case [: do(nval:u2) {value};
// case @: annotation;
// case s: s_con:u2;
// }
if ((index += 1) >= limit) return limit; // read tag
const u1 tag = buffer[index - 1];
switch (tag) {
case 'B':
case 'C':
case 'I':
case 'S':
case 'Z':
case 'D':
case 'F':
case 'J':
case 'c':
case 's':
index += 2; // skip con or s_con
break;
case 'e':
index += 4; // skip e_class, e_name
break;
case '[':
{
if ((index += 2) >= limit) return limit; // read nval
int nval = Bytes::get_Java_u2((address)buffer + index - 2);
while (--nval >= 0 && index < limit) {
index = skip_annotation_value(buffer, limit, index);
}
}
break;
case '@':
index = skip_annotation(buffer, limit, index);
break;
default:
return limit; // bad tag byte
}
return index;
}
// Sift through annotations, looking for those significant to the VM:
static void parse_annotations(const ConstantPool* const cp,
const u1* buffer, int limit,
AnnotationCollector* coll,
ClassLoaderData* loader_data,
TRAPS) {
assert(cp != NULL, "invariant");
assert(buffer != NULL, "invariant");
assert(coll != NULL, "invariant");
assert(loader_data != NULL, "invariant");
// annotations := do(nann:u2) {annotation}
int index = 0;
if ((index += 2) >= limit) return; // read nann
int nann = Bytes::get_Java_u2((address)buffer + index - 2);
enum { // initial annotation layout
atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;'
count_off = 2, // u2 such as 1 (one value)
member_off = 4, // utf8 such as 'value'
tag_off = 6, // u1 such as 'c' (type) or 'e' (enum)
e_tag_val = 'e',
e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
e_size = 11, // end of 'e' annotation
c_tag_val = 'c', // payload is type
c_con_off = 7, // utf8 payload, such as 'I'
c_size = 9, // end of 'c' annotation
s_tag_val = 's', // payload is String
s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;'
s_size = 9,
min_size = 6 // smallest possible size (zero members)
};
while ((--nann) >= 0 && (index - 2 + min_size <= limit)) {
int index0 = index;
index = skip_annotation(buffer, limit, index);
const u1* const abase = buffer + index0;
const int atype = Bytes::get_Java_u2((address)abase + atype_off);
const int count = Bytes::get_Java_u2((address)abase + count_off);
const Symbol* const aname = check_symbol_at(cp, atype);
if (aname == NULL) break; // invalid annotation name
const Symbol* member = NULL;
if (count >= 1) {
const int member_index = Bytes::get_Java_u2((address)abase + member_off);
member = check_symbol_at(cp, member_index);
if (member == NULL) break; // invalid member name
}
// Here is where parsing particular annotations will take place.
AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
if (AnnotationCollector::_unknown == id) continue;
coll->set_annotation(id);
if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
// @Contended can optionally specify the contention group.
//
// Contended group defines the equivalence class over the fields:
// the fields within the same contended group are not treated distinct.
// The only exception is default group, which does not incur the
// equivalence. Naturally, contention group for classes is meaningless.
//
// While the contention group is specified as String, annotation
// values are already interned, and we might as well use the constant
// pool index as the group tag.
//
u2 group_index = 0; // default contended group
if (count == 1
&& s_size == (index - index0) // match size
&& s_tag_val == *(abase + tag_off)
&& member == vmSymbols::value_name()) {
group_index = Bytes::get_Java_u2((address)abase + s_con_off);
if (cp->symbol_at(group_index)->utf8_length() == 0) {
group_index = 0; // default contended group
}
}
coll->set_contended_group(group_index);
}
}
}
// Parse attributes for a field.
void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
u2 attributes_count,
bool is_static, u2 signature_index,
u2* const constantvalue_index_addr,
bool* const is_synthetic_addr,
u2* const generic_signature_index_addr,
ClassFileParser::FieldAnnotationCollector* parsed_annotations,
TRAPS) {
assert(cfs != NULL, "invariant");
assert(constantvalue_index_addr != NULL, "invariant");
assert(is_synthetic_addr != NULL, "invariant");
assert(generic_signature_index_addr != NULL, "invariant");
assert(parsed_annotations != NULL, "invariant");
assert(attributes_count > 0, "attributes_count should be greater than 0");
u2 constantvalue_index = 0;
u2 generic_signature_index = 0;
bool is_synthetic = false;
const u1* runtime_visible_annotations = NULL;
int runtime_visible_annotations_length = 0;
const u1* runtime_invisible_annotations = NULL;
int runtime_invisible_annotations_length = 0;
const u1* runtime_visible_type_annotations = NULL;
int runtime_visible_type_annotations_length = 0;
const u1* runtime_invisible_type_annotations = NULL;
int runtime_invisible_type_annotations_length = 0;
bool runtime_invisible_annotations_exists = false;
bool runtime_invisible_type_annotations_exists = false;
const ConstantPool* const cp = _cp;
while (attributes_count--) {
cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
const u2 attribute_name_index = cfs->get_u2_fast();
const u4 attribute_length = cfs->get_u4_fast();
check_property(valid_symbol_at(attribute_name_index),
"Invalid field attribute index %u in class file %s",
attribute_name_index,
CHECK);
const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
// ignore if non-static
if (constantvalue_index != 0) {
classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
}
check_property(
attribute_length == 2,
"Invalid ConstantValue field attribute length %u in class file %s",
attribute_length, CHECK);
constantvalue_index = cfs->get_u2(CHECK);
if (_need_verify) {
verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
}
} else if (attribute_name == vmSymbols::tag_synthetic()) {
if (attribute_length != 0) {
classfile_parse_error(
"Invalid Synthetic field attribute length %u in class file %s",
attribute_length, CHECK);
}
is_synthetic = true;
} else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
if (attribute_length != 0) {
classfile_parse_error(
"Invalid Deprecated field attribute length %u in class file %s",
attribute_length, CHECK);
}
} else if (_major_version >= JAVA_1_5_VERSION) {
if (attribute_name == vmSymbols::tag_signature()) {
if (attribute_length != 2) {
classfile_parse_error(
"Wrong size %u for field's Signature attribute in class file %s",
attribute_length, CHECK);
}
generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
} else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
if (runtime_visible_annotations != NULL) {
classfile_parse_error(
"Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
}
runtime_visible_annotations_length = attribute_length;
runtime_visible_annotations = cfs->get_u1_buffer();
assert(runtime_visible_annotations != NULL, "null visible annotations");
parse_annotations(cp,
runtime_visible_annotations,
runtime_visible_annotations_length,
parsed_annotations,
_loader_data,
CHECK);
cfs->skip_u1(runtime_visible_annotations_length, CHECK);
} else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
if (runtime_invisible_annotations_exists) {
classfile_parse_error(
"Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
}
runtime_invisible_annotations_exists = true;
if (PreserveAllAnnotations) {
runtime_invisible_annotations_length = attribute_length;
runtime_invisible_annotations = cfs->get_u1_buffer();
assert(runtime_invisible_annotations != NULL, "null invisible annotations");
}
cfs->skip_u1(attribute_length, CHECK);
} else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
if (runtime_visible_type_annotations != NULL) {
classfile_parse_error(
"Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
}
runtime_visible_type_annotations_length = attribute_length;
runtime_visible_type_annotations = cfs->get_u1_buffer();
assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
} else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
if (runtime_invisible_type_annotations_exists) {
classfile_parse_error(
"Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
} else {
runtime_invisible_type_annotations_exists = true;
}
if (PreserveAllAnnotations) {
runtime_invisible_type_annotations_length = attribute_length;
runtime_invisible_type_annotations = cfs->get_u1_buffer();
assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
}
cfs->skip_u1(attribute_length, CHECK);
} else {
cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
}
} else {
cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes
}
}
*constantvalue_index_addr = constantvalue_index;
*is_synthetic_addr = is_synthetic;
*generic_signature_index_addr = generic_signature_index;
AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
runtime_visible_annotations_length,
runtime_invisible_annotations,
runtime_invisible_annotations_length,
CHECK);
parsed_annotations->set_field_annotations(a);
a = assemble_annotations(runtime_visible_type_annotations,
runtime_visible_type_annotations_length,
runtime_invisible_type_annotations,
runtime_invisible_type_annotations_length,
CHECK);
parsed_annotations->set_field_type_annotations(a);
return;
}
// Field allocation types. Used for computing field offsets.
enum FieldAllocationType {
STATIC_OOP, // Oops
STATIC_BYTE, // Boolean, Byte, char
STATIC_SHORT, // shorts
STATIC_WORD, // ints
STATIC_DOUBLE, // aligned long or double
NONSTATIC_OOP,
NONSTATIC_BYTE,
NONSTATIC_SHORT,
NONSTATIC_WORD,
NONSTATIC_DOUBLE,
MAX_FIELD_ALLOCATION_TYPE,
BAD_ALLOCATION_TYPE = -1
};
static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
BAD_ALLOCATION_TYPE, // 0
BAD_ALLOCATION_TYPE, // 1
BAD_ALLOCATION_TYPE, // 2
BAD_ALLOCATION_TYPE, // 3
NONSTATIC_BYTE , // T_BOOLEAN = 4,
NONSTATIC_SHORT, // T_CHAR = 5,
NONSTATIC_WORD, // T_FLOAT = 6,
NONSTATIC_DOUBLE, // T_DOUBLE = 7,
NONSTATIC_BYTE, // T_BYTE = 8,
NONSTATIC_SHORT, // T_SHORT = 9,
NONSTATIC_WORD, // T_INT = 10,
NONSTATIC_DOUBLE, // T_LONG = 11,
NONSTATIC_OOP, // T_OBJECT = 12,
NONSTATIC_OOP, // T_ARRAY = 13,
BAD_ALLOCATION_TYPE, // T_VOID = 14,
BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
BAD_ALLOCATION_TYPE, // T_METADATA = 17,
BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
BAD_ALLOCATION_TYPE, // 0
BAD_ALLOCATION_TYPE, // 1
BAD_ALLOCATION_TYPE, // 2
BAD_ALLOCATION_TYPE, // 3
STATIC_BYTE , // T_BOOLEAN = 4,
STATIC_SHORT, // T_CHAR = 5,
STATIC_WORD, // T_FLOAT = 6,
STATIC_DOUBLE, // T_DOUBLE = 7,
STATIC_BYTE, // T_BYTE = 8,
STATIC_SHORT, // T_SHORT = 9,
STATIC_WORD, // T_INT = 10,
STATIC_DOUBLE, // T_LONG = 11,
STATIC_OOP, // T_OBJECT = 12,
STATIC_OOP, // T_ARRAY = 13,
BAD_ALLOCATION_TYPE, // T_VOID = 14,
BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
BAD_ALLOCATION_TYPE, // T_METADATA = 17,
BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
};
static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
assert(result != BAD_ALLOCATION_TYPE, "bad type");
return result;
}
class ClassFileParser::FieldAllocationCount : public ResourceObj {
public:
u2 count[MAX_FIELD_ALLOCATION_TYPE];
FieldAllocationCount() {
for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
count[i] = 0;
}
}
FieldAllocationType update(bool is_static, BasicType type) {
FieldAllocationType atype = basic_type_to_atype(is_static, type);
// Make sure there is no overflow with injected fields.
assert(count[atype] < 0xFFFF, "More than 65535 fields");
count[atype]++;
return atype;
}
};
// Side-effects: populates the _fields, _fields_annotations,
// _fields_type_annotations fields
void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
bool is_interface,
FieldAllocationCount* const fac,
ConstantPool* cp,
const int cp_size,
u2* const java_fields_count_ptr,
TRAPS) {
assert(cfs != NULL, "invariant");
assert(fac != NULL, "invariant");
assert(cp != NULL, "invariant");
assert(java_fields_count_ptr != NULL, "invariant");
assert(NULL == _fields, "invariant");
assert(NULL == _fields_annotations, "invariant");
assert(NULL == _fields_type_annotations, "invariant");
cfs->guarantee_more(2, CHECK); // length
const u2 length = cfs->get_u2_fast();
*java_fields_count_ptr = length;
int num_injected = 0;
const InjectedField* const injected = JavaClasses::get_injected(_class_name,
&num_injected);
const int total_fields = length + num_injected;
// The field array starts with tuples of shorts
// [access, name index, sig index, initial value index, byte offset].
// A generic signature slot only exists for field with generic
// signature attribute. And the access flag is set with
// JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
// signature slots are at the end of the field array and after all
// other fields data.
//
// f1: [access, name index, sig index, initial value index, low_offset, high_offset]
// f2: [access, name index, sig index, initial value index, low_offset, high_offset]
// ...
// fn: [access, name index, sig index, initial value index, low_offset, high_offset]
// [generic signature index]
// [generic signature index]
// ...
//
// Allocate a temporary resource array for field data. For each field,
// a slot is reserved in the temporary array for the generic signature
// index. After parsing all fields, the data are copied to a permanent
// array and any unused slots will be discarded.
ResourceMark rm(THREAD);
u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
u2,
total_fields * (FieldInfo::field_slots + 1));
// The generic signature slots start after all other fields' data.
int generic_signature_slot = total_fields * FieldInfo::field_slots;
int num_generic_signature = 0;
for (int n = 0; n < length; n++) {
// access_flags, name_index, descriptor_index, attributes_count
cfs->guarantee_more(8, CHECK);
AccessFlags access_flags;
const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
verify_legal_field_modifiers(flags, is_interface, CHECK);
access_flags.set_flags(flags);
const u2 name_index = cfs->get_u2_fast();
check_property(valid_symbol_at(name_index),
"Invalid constant pool index %u for field name in class file %s",
name_index, CHECK);
const Symbol* const name = cp->symbol_at(name_index);
verify_legal_field_name(name, CHECK);
const u2 signature_index = cfs->get_u2_fast();
check_property(valid_symbol_at(signature_index),
"Invalid constant pool index %u for field signature in class file %s",
signature_index, CHECK);
const Symbol* const sig = cp->symbol_at(signature_index);
verify_legal_field_signature(name, sig, CHECK);
u2 constantvalue_index = 0;
bool is_synthetic = false;
u2 generic_signature_index = 0;
const bool is_static = access_flags.is_static();
FieldAnnotationCollector parsed_annotations(_loader_data);
const u2 attributes_count = cfs->get_u2_fast();
if (attributes_count > 0) {
parse_field_attributes(cfs,
attributes_count,
is_static,
signature_index,
&constantvalue_index,
&is_synthetic,
&generic_signature_index,
&parsed_annotations,
CHECK);
if (parsed_annotations.field_annotations() != NULL) {
if (_fields_annotations == NULL) {
_fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
_loader_data, length, NULL,
CHECK);
}
_fields_annotations->at_put(n, parsed_annotations.field_annotations());
parsed_annotations.set_field_annotations(NULL);
}
if (parsed_annotations.field_type_annotations() != NULL) {
if (_fields_type_annotations == NULL) {
_fields_type_annotations =
MetadataFactory::new_array<AnnotationArray*>(_loader_data,
length,
NULL,
CHECK);
}
_fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
parsed_annotations.set_field_type_annotations(NULL);
}
if (is_synthetic) {
access_flags.set_is_synthetic();
}
if (generic_signature_index != 0) {
access_flags.set_field_has_generic_signature();
fa[generic_signature_slot] = generic_signature_index;
generic_signature_slot ++;
num_generic_signature ++;
}
}
FieldInfo* const field = FieldInfo::from_field_array(fa, n);
field->initialize(access_flags.as_short(),
name_index,
signature_index,
constantvalue_index);
const BasicType type = cp->basic_type_for_signature_at(signature_index);
// Remember how many oops we encountered and compute allocation type
const FieldAllocationType atype = fac->update(is_static, type);
field->set_allocation_type(atype);
// After field is initialized with type, we can augment it with aux info
if (parsed_annotations.has_any_annotations())
parsed_annotations.apply_to(field);
}
int index = length;
if (num_injected != 0) {
for (int n = 0; n < num_injected; n++) {
// Check for duplicates
if (injected[n].may_be_java) {
const Symbol* const name = injected[n].name();
const Symbol* const signature = injected[n].signature();
bool duplicate = false;
for (int i = 0; i < length; i++) {
const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
if (name == cp->symbol_at(f->name_index()) &&
signature == cp->symbol_at(f->signature_index())) {
// Symbol is desclared in Java so skip this one
duplicate = true;
break;
}
}
if (duplicate) {
// These will be removed from the field array at the end
continue;
}
}
// Injected field
FieldInfo* const field = FieldInfo::from_field_array(fa, index);
field->initialize(JVM_ACC_FIELD_INTERNAL,
injected[n].name_index,
injected[n].signature_index,
0);
const BasicType type = FieldType::basic_type(injected[n].signature());
// Remember how many oops we encountered and compute allocation type
const FieldAllocationType atype = fac->update(false, type);
field->set_allocation_type(atype);
index++;
}
}
assert(NULL == _fields, "invariant");
_fields =
MetadataFactory::new_array<u2>(_loader_data,
index * FieldInfo::field_slots + num_generic_signature,
CHECK);
// Sometimes injected fields already exist in the Java source so
// the fields array could be too long. In that case the
// fields array is trimed. Also unused slots that were reserved
// for generic signature indexes are discarded.
{
int i = 0;
for (; i < index * FieldInfo::field_slots; i++) {
_fields->at_put(i, fa[i]);
}
for (int j = total_fields * FieldInfo::field_slots;
j < generic_signature_slot; j++) {
_fields->at_put(i++, fa[j]);
}
assert(_fields->length() == i, "");
}
if (_need_verify && length > 1) {
// Check duplicated fields
ResourceMark rm(THREAD);
NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, NameSigHash*, HASH_ROW_SIZE);
initialize_hashtable(names_and_sigs);
bool dup = false;
{
debug_only(NoSafepointVerifier nsv;)
for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
const Symbol* const name = fs.name();
const Symbol* const sig = fs.signature();
// If no duplicates, add name/signature in hashtable names_and_sigs.
if (!put_after_lookup(name, sig, names_and_sigs)) {
dup = true;
break;
}
}
}
if (dup) {
classfile_parse_error("Duplicate field name&signature in class file %s",
CHECK);
}
}
}
static void copy_u2_with_conversion(u2* dest, const u2* src, int length) {
while (length-- > 0) {
*dest++ = Bytes::get_Java_u2((u1*) (src++));
}
}
const u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
u4 code_length,
u4 exception_table_length,
TRAPS) {
assert(cfs != NULL, "invariant");
const u2* const exception_table_start = cfs->get_u2_buffer();
assert(exception_table_start != NULL, "null exception table");
cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
// end_pc,
// handler_pc,
// catch_type_index
// Will check legal target after parsing code array in verifier.
if (_need_verify) {
for (unsigned int i = 0; i < exception_table_length; i++) {
const u2 start_pc = cfs->get_u2_fast();
const u2 end_pc = cfs->get_u2_fast();
const u2 handler_pc = cfs->get_u2_fast();
const u2 catch_type_index = cfs->get_u2_fast();
guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
"Illegal exception table range in class file %s",
CHECK_NULL);
guarantee_property(handler_pc < code_length,
"Illegal exception table handler in class file %s",
CHECK_NULL);
if (catch_type_index != 0) {
guarantee_property(valid_klass_reference_at(catch_type_index),
"Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
}
}
} else {
cfs->skip_u2_fast(exception_table_length * 4);
}
return exception_table_start;
}
void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
u4 code_length,
CompressedLineNumberWriteStream**const write_stream,
TRAPS) {
const ClassFileStream* const cfs = _stream;
unsigned int num_entries = cfs->get_u2(CHECK);
// Each entry is a u2 start_pc, and a u2 line_number
const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
// Verify line number attribute and table length
check_property(
code_attribute_length == sizeof(u2) + length_in_bytes,
"LineNumberTable attribute has wrong length in class file %s", CHECK);
cfs->guarantee_more(length_in_bytes, CHECK);
if ((*write_stream) == NULL) {
if (length_in_bytes > fixed_buffer_size) {
(*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
} else {
(*write_stream) = new CompressedLineNumberWriteStream(
_linenumbertable_buffer, fixed_buffer_size);
}
}
while (num_entries-- > 0) {
const u2 bci = cfs->get_u2_fast(); // start_pc
const u2 line = cfs->get_u2_fast(); // line_number
guarantee_property(bci < code_length,
"Invalid pc in LineNumberTable in class file %s", CHECK);
(*write_stream)->write_pair(bci, line);
}
}
class LVT_Hash : public AllStatic {
public:
static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
/*
* 3-tuple start_bci/length/slot has to be unique key,
* so the following comparison seems to be redundant:
* && elem->name_cp_index == entry->_elem->name_cp_index
*/
return (e0.start_bci == e1.start_bci &&
e0.length == e1.length &&
e0.name_cp_index == e1.name_cp_index &&
e0.slot == e1.slot);
}
static unsigned int hash(LocalVariableTableElement const& e0) {
unsigned int raw_hash = e0.start_bci;
raw_hash = e0.length + raw_hash * 37;
raw_hash = e0.name_cp_index + raw_hash * 37;
raw_hash = e0.slot + raw_hash * 37;
return raw_hash;
}
};
// Class file LocalVariableTable elements.
class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
public:
u2 start_bci;
u2 length;
u2 name_cp_index;
u2 descriptor_cp_index;
u2 slot;
};
static void copy_lvt_element(const Classfile_LVT_Element* const src,
LocalVariableTableElement* const lvt) {
lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci);
lvt->length = Bytes::get_Java_u2((u1*) &src->length);
lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index);
lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
lvt->signature_cp_index = 0;
lvt->slot = Bytes::get_Java_u2((u1*) &src->slot);
}
// Function is used to parse both attributes:
// LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
const u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
u4 code_length,
u2 max_locals,
u4 code_attribute_length,
u2* const localvariable_table_length,
bool isLVTT,
TRAPS) {
const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
*localvariable_table_length = cfs->get_u2(CHECK_NULL);
const unsigned int size =
(*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
const ConstantPool* const cp = _cp;
// Verify local variable table attribute has right length
if (_need_verify) {
guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
"%s has wrong length in class file %s", tbl_name, CHECK_NULL);
}
const u2* const localvariable_table_start = cfs->get_u2_buffer();
assert(localvariable_table_start != NULL, "null local variable table");
if (!_need_verify) {
cfs->skip_u2_fast(size);
} else {
cfs->guarantee_more(size * 2, CHECK_NULL);
for(int i = 0; i < (*localvariable_table_length); i++) {
const u2 start_pc = cfs->get_u2_fast();
const u2 length = cfs->get_u2_fast();
const u2 name_index = cfs->get_u2_fast();
const u2 descriptor_index = cfs->get_u2_fast();
const u2 index = cfs->get_u2_fast();
// Assign to a u4 to avoid overflow
const u4 end_pc = (u4)start_pc + (u4)length;
if (start_pc >= code_length) {
classfile_parse_error(
"Invalid start_pc %u in %s in class file %s",
start_pc, tbl_name, CHECK_NULL);
}
if (end_pc > code_length) {
classfile_parse_error(
"Invalid length %u in %s in class file %s",
length, tbl_name, CHECK_NULL);
}
const int cp_size = cp->length();
guarantee_property(valid_symbol_at(name_index),
"Name index %u in %s has bad constant type in class file %s",
name_index, tbl_name, CHECK_NULL);
guarantee_property(valid_symbol_at(descriptor_index),
"Signature index %u in %s has bad constant type in class file %s",
descriptor_index, tbl_name, CHECK_NULL);
const Symbol* const name = cp->symbol_at(name_index);
const Symbol* const sig = cp->symbol_at(descriptor_index);
verify_legal_field_name(name, CHECK_NULL);
u2 extra_slot = 0;
if (!isLVTT) {
verify_legal_field_signature(name, sig, CHECK_NULL);
// 4894874: check special cases for double and long local variables
if (sig == vmSymbols::type_signature(T_DOUBLE) ||
sig == vmSymbols::type_signature(T_LONG)) {
extra_slot = 1;
}
}
guarantee_property((index + extra_slot) < max_locals,
"Invalid index %u in %s in class file %s",
index, tbl_name, CHECK_NULL);
}
}
return localvariable_table_start;
}
void ClassFileParser::parse_type_array(u2 array_length,
u4 code_length,
u4* const u1_index,
u4* const u2_index,
u1* const u1_array,
u2* const u2_array,
TRAPS) {
const ClassFileStream* const cfs = _stream;
u2 index = 0; // index in the array with long/double occupying two slots
u4 i1 = *u1_index;
u4 i2 = *u2_index + 1;
for(int i = 0; i < array_length; i++) {
const u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
index++;
if (tag == ITEM_Long || tag == ITEM_Double) {
index++;
} else if (tag == ITEM_Object) {
const u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
guarantee_property(valid_klass_reference_at(class_index),
"Bad class index %u in StackMap in class file %s",
class_index, CHECK);
} else if (tag == ITEM_Uninitialized) {
const u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
guarantee_property(
offset < code_length,
"Bad uninitialized type offset %u in StackMap in class file %s",
offset, CHECK);
} else {
guarantee_property(
tag <= (u1)ITEM_Uninitialized,
"Unknown variable type %u in StackMap in class file %s",
tag, CHECK);
}
}
u2_array[*u2_index] = index;
*u1_index = i1;
*u2_index = i2;
}
static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
u4 code_attribute_length,
bool need_verify,
TRAPS) {
assert(cfs != NULL, "invariant");
if (0 == code_attribute_length) {
return NULL;
}
const u1* const stackmap_table_start = cfs->get_u1_buffer();
assert(stackmap_table_start != NULL, "null stackmap table");
// check code_attribute_length first
cfs->skip_u1(code_attribute_length, CHECK_NULL);
if (!need_verify && !DumpSharedSpaces) {
return NULL;
}
return stackmap_table_start;
}
const u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
u2* const checked_exceptions_length,
u4 method_attribute_length,
TRAPS) {
assert(cfs != NULL, "invariant");
assert(checked_exceptions_length != NULL, "invariant");
cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length
*checked_exceptions_length = cfs->get_u2_fast();
const unsigned int size =
(*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
const u2* const checked_exceptions_start = cfs->get_u2_buffer();
assert(checked_exceptions_start != NULL, "null checked exceptions");
if (!_need_verify) {
cfs->skip_u2_fast(size);
} else {
// Verify each value in the checked exception table
u2 checked_exception;
const u2 len = *checked_exceptions_length;
cfs->guarantee_more(2 * len, CHECK_NULL);
for (int i = 0; i < len; i++) {
checked_exception = cfs->get_u2_fast();
check_property(
valid_klass_reference_at(checked_exception),
"Exception name has bad type at constant pool %u in class file %s",
checked_exception, CHECK_NULL);
}
}
// check exceptions attribute length
if (_need_verify) {
guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
sizeof(u2) * size),
"Exceptions attribute has wrong length in class file %s", CHECK_NULL);
}
return checked_exceptions_start;
}
void ClassFileParser::throwIllegalSignature(const char* type,
const Symbol* name,
const Symbol* sig,
TRAPS) const {
assert(name != NULL, "invariant");
assert(sig != NULL, "invariant");
ResourceMark rm(THREAD);
Exceptions::fthrow(THREAD_AND_LOCATION,
vmSymbols::java_lang_ClassFormatError(),
"%s \"%s\" in class %s has illegal signature \"%s\"", type,
name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
}
AnnotationCollector::ID
AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
const Symbol* name) {
const vmSymbols::SID sid = vmSymbols::find_sid(name);
// Privileged code can use all annotations. Other code silently drops some.
const bool privileged = loader_data->is_the_null_class_loader_data() ||
loader_data->is_platform_class_loader_data() ||
loader_data->is_anonymous();
switch (sid) {
case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_CallerSensitive;
}
case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_ForceInline;
}
case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_DontInline;
}
case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_InjectedProfile;
}
case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_LambdaForm_Compiled;
}
case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): {
if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_LambdaForm_Hidden;
}
case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
if (_location != _in_method) break; // only allow for methods
if (!privileged) break; // only allow in privileged code
return _method_HotSpotIntrinsicCandidate;
}
#if INCLUDE_JVMCI
case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_vm_ci_hotspot_Stable_signature): {
if (_location != _in_field) break; // only allow for fields
if (!privileged) break; // only allow in privileged code
return _field_Stable;
}
#endif
case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
if (_location != _in_field) break; // only allow for fields
if (!privileged) break; // only allow in privileged code
return _field_Stable;
}
case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
if (_location != _in_field && _location != _in_class) {
break; // only allow for fields and classes
}
if (!EnableContended || (RestrictContended && !privileged)) {
break; // honor privileges
}
return _jdk_internal_vm_annotation_Contended;
}
case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
if (_location != _in_method) break; // only allow for methods
if (RestrictReservedStack && !privileged) break; // honor privileges
return _jdk_internal_vm_annotation_ReservedStackAccess;
}
default: {
break;
}
}
return AnnotationCollector::_unknown;
}
void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
if (is_contended())
f->set_contended_group(contended_group());
if (is_stable())
f->set_stable(true);
}
ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
// If there's an error deallocate metadata for field annotations
MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
}
void MethodAnnotationCollector::apply_to(methodHandle m) {
if (has_annotation(_method_CallerSensitive))
m->set_caller_sensitive(true);
if (has_annotation(_method_ForceInline))
m->set_force_inline(true);
if (has_annotation(_method_DontInline))
m->set_dont_inline(true);
if (has_annotation(_method_InjectedProfile))
m->set_has_injected_profile(true);
if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
if (has_annotation(_method_LambdaForm_Hidden))
m->set_hidden(true);
if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
m->set_intrinsic_candidate(true);
if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
m->set_has_reserved_stack_access(true);
}
void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
assert(ik != NULL, "invariant");
ik->set_is_contended(is_contended());
}
#define MAX_ARGS_SIZE 255
#define MAX_CODE_SIZE 65535
#define INITIAL_MAX_LVT_NUMBER 256
/* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
*
* Rules for LVT's and LVTT's are:
* - There can be any number of LVT's and LVTT's.
* - If there are n LVT's, it is the same as if there was just
* one LVT containing all the entries from the n LVT's.
* - There may be no more than one LVT entry per local variable.
* Two LVT entries are 'equal' if these fields are the same:
* start_pc, length, name, slot
* - There may be no more than one LVTT entry per each LVT entry.
* Each LVTT entry has to match some LVT entry.
* - HotSpot internal LVT keeps natural ordering of class file LVT entries.
*/
void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
int lvt_cnt,
u2* const localvariable_table_length,
const u2**const localvariable_table_start,
int lvtt_cnt,
u2* const localvariable_type_table_length,
const u2**const localvariable_type_table_start,
TRAPS) {
ResourceMark rm(THREAD);
typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
&LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
LVT_HashTable* const table = new LVT_HashTable();
// To fill LocalVariableTable in
const Classfile_LVT_Element* cf_lvt;
LocalVariableTableElement* lvt = cm->localvariable_table_start();
for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
copy_lvt_element(&cf_lvt[idx], lvt);
// If no duplicates, add LVT elem in hashtable.
if (table->put(*lvt, lvt) == false
&& _need_verify
&& _major_version >= JAVA_1_5_VERSION) {
classfile_parse_error("Duplicated LocalVariableTable attribute "
"entry for '%s' in class file %s",
_cp->symbol_at(lvt->name_cp_index)->as_utf8(),
CHECK);
}
}
}
// To merge LocalVariableTable and LocalVariableTypeTable
const Classfile_LVT_Element* cf_lvtt;
LocalVariableTableElement lvtt_elem;
for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
LocalVariableTableElement** entry = table->get(lvtt_elem);
if (entry == NULL) {
if (_need_verify) {
classfile_parse_error("LVTT entry for '%s' in class file %s "
"does not match any LVT entry",
_cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
CHECK);
}
} else if ((*entry)->signature_cp_index != 0 && _need_verify) {
classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
"entry for '%s' in class file %s",
_cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
CHECK);
} else {
// to add generic signatures into LocalVariableTable
(*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
}
}
}
}
void ClassFileParser::copy_method_annotations(ConstMethod* cm,
const u1* runtime_visible_annotations,
int runtime_visible_annotations_length,
const u1* runtime_invisible_annotations,
int runtime_invisible_annotations_length,
const u1* runtime_visible_parameter_annotations,
int runtime_visible_parameter_annotations_length,
const u1* runtime_invisible_parameter_annotations,
int runtime_invisible_parameter_annotations_length,
const u1* runtime_visible_type_annotations,
int runtime_visible_type_annotations_length,
const u1* runtime_invisible_type_annotations,
int runtime_invisible_type_annotations_length,
const u1* annotation_default,
int annotation_default_length,
TRAPS) {
AnnotationArray* a;
if (runtime_visible_annotations_length +
runtime_invisible_annotations_length > 0) {
a = assemble_annotations(runtime_visible_annotations,
runtime_visible_annotations_length,
runtime_invisible_annotations,
runtime_invisible_annotations_length,
CHECK);
cm->set_method_annotations(a);
}
if (runtime_visible_parameter_annotations_length +
runtime_invisible_parameter_annotations_length > 0) {
a = assemble_annotations(runtime_visible_parameter_annotations,
runtime_visible_parameter_annotations_length,
runtime_invisible_parameter_annotations,
runtime_invisible_parameter_annotations_length,
CHECK);
cm->set_parameter_annotations(a);
}
if (annotation_default_length > 0) {
a = assemble_annotations(annotation_default,
annotation_default_length,
NULL,
0,
CHECK);
cm->set_default_annotations(a);
}
if (runtime_visible_type_annotations_length +
runtime_invisible_type_annotations_length > 0) {
a = assemble_annotations(runtime_visible_type_annotations,
runtime_visible_type_annotations_length,
runtime_invisible_type_annotations,
runtime_invisible_type_annotations_length,
CHECK);
cm->set_type_annotations(a);
}
}
// Note: the parse_method below is big and clunky because all parsing of the code and exceptions
// attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
// Method* to save footprint, so we only know the size of the resulting Method* when the
// entire method attribute is parsed.
//
// The promoted_flags parameter is used to pass relevant access_flags
// from the method back up to the containing klass. These flag values
// are added to klass's access_flags.
Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
bool is_interface,
const ConstantPool* cp,
AccessFlags* const promoted_flags,
TRAPS) {
assert(cfs != NULL, "invariant");
assert(cp != NULL, "invariant");
assert(promoted_flags != NULL, "invariant");
ResourceMark rm(THREAD);
// Parse fixed parts:
// access_flags, name_index, descriptor_index, attributes_count
cfs->guarantee_more(8, CHECK_NULL);
int flags = cfs->get_u2_fast();
const u2 name_index = cfs->get_u2_fast();
const int cp_size = cp->length();
check_property(
valid_symbol_at(name_index),
"Illegal constant pool index %u for method name in class file %s",
name_index, CHECK_NULL);
const Symbol* const name = cp->symbol_at(name_index);
verify_legal_method_name(name, CHECK_NULL);
const u2 signature_index = cfs->get_u2_fast();
guarantee_property(
valid_symbol_at(signature_index),
"Illegal constant pool index %u for method signature in class file %s",
signature_index, CHECK_NULL);
const Symbol* const signature = cp->symbol_at(signature_index);
if (name == vmSymbols::class_initializer_name()) {
// We ignore the other access flags for a valid class initializer.
// (JVM Spec 2nd ed., chapter 4.6)
if (_major_version < 51) { // backward compatibility
flags = JVM_ACC_STATIC;
} else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
} else {
classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
}
} else {
verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
}
if (name == vmSymbols::object_initializer_name() && is_interface) {
classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
}
int args_size = -1; // only used when _need_verify is true
if (_need_verify) {
args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
verify_legal_method_signature(name, signature, CHECK_NULL);
if (args_size > MAX_ARGS_SIZE) {
classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
}
}
AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
// Default values for code and exceptions attribute elements
u2 max_stack = 0;
u2 max_locals = 0;
u4 code_length = 0;
const u1* code_start = 0;
u2 exception_table_length = 0;
const u2* exception_table_start = NULL;
Array<int>* exception_handlers = Universe::the_empty_int_array();
u2 checked_exceptions_length = 0;
const u2* checked_exceptions_start = NULL;
CompressedLineNumberWriteStream* linenumber_table = NULL;
int linenumber_table_length = 0;
int total_lvt_length = 0;
u2 lvt_cnt = 0;
u2 lvtt_cnt = 0;
bool lvt_allocated = false;
u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
u2* localvariable_table_length = NULL;
const u2** localvariable_table_start = NULL;
u2* localvariable_type_table_length = NULL;
const u2** localvariable_type_table_start = NULL;
int method_parameters_length = -1;
const u1* method_parameters_data = NULL;
bool method_parameters_seen = false;
bool parsed_code_attribute = false;
bool parsed_checked_exceptions_attribute = false;
bool parsed_stackmap_attribute = false;
// stackmap attribute - JDK1.5
const u1* stackmap_data = NULL;
int stackmap_data_length = 0;
u2 generic_signature_index = 0;
MethodAnnotationCollector parsed_annotations;
const u1* runtime_visible_annotations = NULL;
int runtime_visible_annotations_length = 0;
const u1* runtime_invisible_annotations = NULL;
int runtime_invisible_annotations_length = 0;
const u1* runtime_visible_parameter_annotations = NULL;
int runtime_visible_parameter_annotations_length = 0;
const u1* runtime_invisible_parameter_annotations = NULL;
int runtime_invisible_parameter_annotations_length = 0;
const u1* runtime_visible_type_annotations = NULL;
int runtime_visible_type_annotations_length = 0;
const u1* runtime_invisible_type_annotations = NULL;
int runtime_invisible_type_annotations_length = 0;
bool runtime_invisible_annotations_exists = false;
bool runtime_invisible_type_annotations_exists = false;
bool runtime_invisible_parameter_annotations_exists = false;
const u1* annotation_default = NULL;
int annotation_default_length = 0;
// Parse code and exceptions attribute
u2 method_attributes_count = cfs->get_u2_fast();
while (method_attributes_count--) {
cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length
const u2 method_attribute_name_index = cfs->get_u2_fast();
const u4 method_attribute_length = cfs->get_u4_fast();
check_property(
valid_symbol_at(method_attribute_name_index),
"Invalid method attribute name index %u in class file %s",
method_attribute_name_index, CHECK_NULL);
const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
if (method_attribute_name == vmSymbols::tag_code()) {
// Parse Code attribute
if (_need_verify) {
guarantee_property(
!access_flags.is_native() && !access_flags.is_abstract(),
"Code attribute in native or abstract methods in class file %s",
CHECK_NULL);
}
if (parsed_code_attribute) {
classfile_parse_error("Multiple Code attributes in class file %s",
CHECK_NULL);
}
parsed_code_attribute = true;
// Stack size, locals size, and code size
if (_major_version == 45 && _minor_version <= 2) {
cfs->guarantee_more(4, CHECK_NULL);
max_stack = cfs->get_u1_fast();
max_locals = cfs->get_u1_fast();
code_length = cfs->get_u2_fast();
} else {
cfs->guarantee_more(8, CHECK_NULL);
max_stack = cfs->get_u2_fast();
max_locals = cfs->get_u2_fast();
code_length = cfs->get_u4_fast();
}
if (_need_verify) {
guarantee_property(args_size <= max_locals,
"Arguments can't fit into locals in class file %s",
CHECK_NULL);
guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
"Invalid method Code length %u in class file %s",
code_length, CHECK_NULL);
}
// Code pointer
code_start = cfs->get_u1_buffer();
assert(code_start != NULL, "null code start");
cfs->guarantee_more(code_length, CHECK_NULL);
cfs->skip_u1_fast(code_length);
// Exception handler table
cfs->guarantee_more(2, CHECK_NULL); // exception_table_length
exception_table_length = cfs->get_u2_fast();
if (exception_table_length > 0) {
exception_table_start = parse_exception_table(cfs,
code_length,
exception_table_length,
CHECK_NULL);
}
// Parse additional attributes in code attribute
cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count
u2 code_attributes_count = cfs->get_u2_fast();
unsigned int calculated_attribute_length = 0;
if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
calculated_attribute_length =
sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
} else {
// max_stack, locals and length are smaller in pre-version 45.2 classes
calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
}
calculated_attribute_length +=
code_length +
sizeof(exception_table_length) +
sizeof(code_attributes_count) +
exception_table_length *
( sizeof(u2) + // start_pc
sizeof(u2) + // end_pc
sizeof(u2) + // handler_pc
sizeof(u2) ); // catch_type_index
while (code_attributes_count--) {
cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length
const u2 code_attribute_name_index = cfs->get_u2_fast();
const u4 code_attribute_length = cfs->get_u4_fast();
calculated_attribute_length += code_attribute_length +
sizeof(code_attribute_name_index) +
sizeof(code_attribute_length);
check_property(valid_symbol_at(code_attribute_name_index),
"Invalid code attribute name index %u in class file %s",
code_attribute_name_index,
CHECK_NULL);
if (LoadLineNumberTables &&
cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
// Parse and compress line number table
parse_linenumber_table(code_attribute_length,
code_length,
&linenumber_table,
CHECK_NULL);
} else if (LoadLocalVariableTables &&
cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
// Parse local variable table
if (!lvt_allocated) {
localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, u2, INITIAL_MAX_LVT_NUMBER);
localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, const u2*, INITIAL_MAX_LVT_NUMBER);
localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, u2, INITIAL_MAX_LVT_NUMBER);
localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, const u2*, INITIAL_MAX_LVT_NUMBER);
lvt_allocated = true;
}
if (lvt_cnt == max_lvt_cnt) {
max_lvt_cnt <<= 1;
localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
localvariable_table_start = REALLOC_RESOURCE_ARRAY(const u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
}
localvariable_table_start[lvt_cnt] =
parse_localvariable_table(cfs,
code_length,
max_locals,
code_attribute_length,
&localvariable_table_length[lvt_cnt],
false, // is not LVTT
CHECK_NULL);
total_lvt_length += localvariable_table_length[lvt_cnt];
lvt_cnt++;
} else if (LoadLocalVariableTypeTables &&
_major_version >= JAVA_1_5_VERSION &&
cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
if (!lvt_allocated) {
localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, u2, INITIAL_MAX_LVT_NUMBER);
localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, const u2*, INITIAL_MAX_LVT_NUMBER);
localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, u2, INITIAL_MAX_LVT_NUMBER);
localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, const u2*, INITIAL_MAX_LVT_NUMBER);
lvt_allocated = true;
}
// Parse local variable type table
if (lvtt_cnt == max_lvtt_cnt) {
max_lvtt_cnt <<= 1;
localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
}
localvariable_type_table_start[lvtt_cnt] =
parse_localvariable_table(cfs,
code_length,
max_locals,
code_attribute_length,
&localvariable_type_table_length[lvtt_cnt],
true, // is LVTT
CHECK_NULL);
lvtt_cnt++;
} else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
// Stack map is only needed by the new verifier in JDK1.5.
if (parsed_stackmap_attribute) {
classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
}
stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
stackmap_data_length = code_attribute_length;
parsed_stackmap_attribute = true;
} else {
// Skip unknown attributes
cfs->skip_u1(code_attribute_length, CHECK_NULL);
}
}
// check method attribute length
if (_need_verify) {
guarantee_property(method_attribute_length == calculated_attribute_length,
"Code segment has wrong length in class file %s",
CHECK_NULL);
}
} else if (method_attribute_name == vmSymbols::tag_exceptions()) {
// Parse Exceptions attribute
if (parsed_checked_exceptions_attribute) {
classfile_parse_error("Multiple Exceptions attributes in class file %s",
CHECK_NULL);
}
parsed_checked_exceptions_attribute = true;
checked_exceptions_start =
parse_checked_exceptions(cfs,
&checked_exceptions_length,
method_attribute_length,
CHECK_NULL);
} else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
// reject multiple method parameters
if (method_parameters_seen) {
classfile_parse_error("Multiple MethodParameters attributes in class file %s",
CHECK_NULL);
}
method_parameters_seen = true;
method_parameters_length = cfs->get_u1_fast();
const u2 real_length = (method_parameters_length * 4u) + 1u;
if (method_attribute_length != real_length) {
classfile_parse_error(
"Invalid MethodParameters method attribute length %u in class file",
method_attribute_length, CHECK_NULL);
}
method_parameters_data = cfs->get_u1_buffer();
cfs->skip_u2_fast(method_parameters_length);
cfs->skip_u2_fast(method_parameters_length);
// ignore this attribute if it cannot be reflected
if (!SystemDictionary::Parameter_klass_loaded())
method_parameters_length = -1;
} else if (method_attribute_name == vmSymbols::tag_synthetic()) {
if (method_attribute_length != 0) {
classfile_parse_error(
"Invalid Synthetic method attribute length %u in class file %s",
method_attribute_length, CHECK_NULL);
}
// Should we check that there hasn't already been a synthetic attribute?
access_flags.set_is_synthetic();
} else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
if (method_attribute_length != 0) {
classfile_parse_error(
"Invalid Deprecated method attribute length %u in class file %s",
method_attribute_length, CHECK_NULL);
}
} else if (_major_version >= JAVA_1_5_VERSION) {
if (method_attribute_name == vmSymbols::tag_signature()) {
if (method_attribute_length != 2) {
classfile_parse_error(
"Invalid Signature attribute length %u in class file %s",
method_attribute_length, CHECK_NULL);
}
generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
} else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
if (runtime_visible_annotations != NULL) {
classfile_parse_error(
"Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
CHECK_NULL);
}
runtime_visible_annotations_length = method_attribute_length;
runtime_visible_annotations = cfs->get_u1_buffer();
assert(runtime_visible_annotations != NULL, "null visible annotations");
parse_annotations(cp,
runtime_visible_annotations,
runtime_visible_annotations_length,
&parsed_annotations,
_loader_data,
CHECK_NULL);
cfs->skip_u1(runtime_visible_annotations_length, CHECK_NULL);
} else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
if (runtime_invisible_annotations_exists) {
classfile_parse_error(
"Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
CHECK_NULL);
}
runtime_invisible_annotations_exists = true;
if (PreserveAllAnnotations) {
runtime_invisible_annotations_length = method_attribute_length;
runtime_invisible_annotations = cfs->get_u1_buffer();
assert(runtime_invisible_annotations != NULL, "null invisible annotations");
}
cfs->skip_u1(method_attribute_length, CHECK_NULL);
} else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
if (runtime_visible_parameter_annotations != NULL) {
classfile_parse_error(
"Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
CHECK_NULL);
}
runtime_visible_parameter_annotations_length = method_attribute_length;
runtime_visible_parameter_annotations = cfs->get_u1_buffer();
assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
} else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
if (runtime_invisible_parameter_annotations_exists) {
classfile_parse_error(
"Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
CHECK_NULL);
}
runtime_invisible_parameter_annotations_exists = true;
if (PreserveAllAnnotations) {
runtime_invisible_parameter_annotations_length = method_attribute_length;
runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
assert(runtime_invisible_parameter_annotations != NULL,
"null invisible parameter annotations");
}
cfs->skip_u1(method_attribute_length, CHECK_NULL);
} else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
if (annotation_default != NULL) {
classfile_parse_error(
"Multiple AnnotationDefault attributes for method in class file %s",
CHECK_NULL);
}
annotation_default_length = method_attribute_length;
annotation_default = cfs->get_u1_buffer();
assert(annotation_default != NULL, "null annotation default");
cfs->skip_u1(annotation_default_length, CHECK_NULL);
} else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
if (runtime_visible_type_annotations != NULL) {
classfile_parse_error(
"Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
CHECK_NULL);
}
runtime_visible_type_annotations_length = method_attribute_length;
runtime_visible_type_annotations = cfs->get_u1_buffer();
assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
// No need for the VM to parse Type annotations
cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
} else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
if (runtime_invisible_type_annotations_exists) {
classfile_parse_error(
"Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
CHECK_NULL);
} else {
runtime_invisible_type_annotations_exists = true;
}
if (PreserveAllAnnotations) {
runtime_invisible_type_annotations_length = method_attribute_length;
runtime_invisible_type_annotations = cfs->get_u1_buffer();
assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
}
cfs->skip_u1(method_attribute_length, CHECK_NULL);
} else {
// Skip unknown attributes
cfs->skip_u1(method_attribute_length, CHECK_NULL);
}
} else {
// Skip unknown attributes
cfs->skip_u1(method_attribute_length, CHECK_NULL);
}
}
if (linenumber_table != NULL) {
linenumber_table->write_terminator();
linenumber_table_length = linenumber_table->position();
}
// Make sure there's at least one Code attribute in non-native/non-abstract method
if (_need_verify) {
guarantee_property(access_flags.is_native() ||
access_flags.is_abstract() ||
parsed_code_attribute,
"Absent Code attribute in method that is not native or abstract in class file %s",
CHECK_NULL);
}
// All sizing information for a Method* is finally available, now create it
InlineTableSizes sizes(
total_lvt_length,
linenumber_table_length,
exception_table_length,
checked_exceptions_length,
method_parameters_length,
generic_signature_index,
runtime_visible_annotations_length +
runtime_invisible_annotations_length,
runtime_visible_parameter_annotations_length +
runtime_invisible_parameter_annotations_length,
runtime_visible_type_annotations_length +
runtime_invisible_type_annotations_length,
annotation_default_length,
0);
Method* const m = Method::allocate(_loader_data,
code_length,
access_flags,
&sizes,
ConstMethod::NORMAL,
CHECK_NULL);
ClassLoadingService::add_class_method_size(m->size()*wordSize);
// Fill in information from fixed part (access_flags already set)
m->set_constants(_cp);
m->set_name_index(name_index);
m->set_signature_index(signature_index);
ResultTypeFinder rtf(cp->symbol_at(signature_index));
m->constMethod()->set_result_type(rtf.type());
if (args_size >= 0) {
m->set_size_of_parameters(args_size);
} else {
m->compute_size_of_parameters(THREAD);
}
#ifdef ASSERT
if (args_size >= 0) {
m->compute_size_of_parameters(THREAD);
assert(args_size == m->size_of_parameters(), "");
}
#endif
// Fill in code attribute information
m->set_max_stack(max_stack);
m->set_max_locals(max_locals);
if (stackmap_data != NULL) {
m->constMethod()->copy_stackmap_data(_loader_data,
(u1*)stackmap_data,
stackmap_data_length,
CHECK_NULL);
}
// Copy byte codes
m->set_code((u1*)code_start);
// Copy line number table
if (linenumber_table != NULL) {
memcpy(m->compressed_linenumber_table(),
linenumber_table->buffer(),
linenumber_table_length);
}
// Copy exception table
if (exception_table_length > 0) {
int size =
exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
copy_u2_with_conversion((u2*) m->exception_table_start(),
exception_table_start, size);
}
// Copy method parameters
if (method_parameters_length > 0) {
MethodParametersElement* elem = m->constMethod()->method_parameters_start();
for (int i = 0; i < method_parameters_length; i++) {
elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
method_parameters_data += 2;
elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
method_parameters_data += 2;
}
}
// Copy checked exceptions
if (checked_exceptions_length > 0) {
const int size =
checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
copy_u2_with_conversion((u2*) m->checked_exceptions_start(),
checked_exceptions_start,
size);
}
// Copy class file LVT's/LVTT's into the HotSpot internal LVT.
if (total_lvt_length > 0) {
promoted_flags->set_has_localvariable_table();
copy_localvariable_table(m->constMethod(),
lvt_cnt,
localvariable_table_length,
localvariable_table_start,
lvtt_cnt,
localvariable_type_table_length,
localvariable_type_table_start,
CHECK_NULL);
}
if (parsed_annotations.has_any_annotations())
parsed_annotations.apply_to(m);
// Copy annotations
copy_method_annotations(m->constMethod(),
runtime_visible_annotations,
runtime_visible_annotations_length,
runtime_invisible_annotations,
runtime_invisible_annotations_length,
runtime_visible_parameter_annotations,
runtime_visible_parameter_annotations_length,
runtime_invisible_parameter_annotations,
runtime_invisible_parameter_annotations_length,
runtime_visible_type_annotations,
runtime_visible_type_annotations_length,
runtime_invisible_type_annotations,
runtime_invisible_type_annotations_length,
annotation_default,
annotation_default_length,
CHECK_NULL);
if (name == vmSymbols::finalize_method_name() &&
signature == vmSymbols::void_method_signature()) {
if (m->is_empty_method()) {
_has_empty_finalizer = true;
} else {
_has_finalizer = true;
}
}
if (name == vmSymbols::object_initializer_name() &&
signature == vmSymbols::void_method_signature() &&
m->is_vanilla_constructor()) {
_has_vanilla_constructor = true;
}
NOT_PRODUCT(m->verify());
return m;
}
// The promoted_flags parameter is used to pass relevant access_flags
// from the methods back up to the containing klass. These flag values
// are added to klass's access_flags.
// Side-effects: populates the _methods field in the parser
void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
bool is_interface,
AccessFlags* promoted_flags,
bool* has_final_method,
bool* declares_default_methods,
TRAPS) {
assert(cfs != NULL, "invariant");
assert(promoted_flags != NULL, "invariant");
assert(has_final_method != NULL, "invariant");
assert(declares_default_methods != NULL, "invariant");
assert(NULL == _methods, "invariant");
cfs->guarantee_more(2, CHECK); // length
const u2 length = cfs->get_u2_fast();
if (length == 0) {
_methods = Universe::the_empty_method_array();
} else {
_methods = MetadataFactory::new_array<Method*>(_loader_data,
length,
NULL,
CHECK);
HandleMark hm(THREAD);
for (int index = 0; index < length; index++) {
Method* method = parse_method(cfs,
is_interface,
_cp,
promoted_flags,
CHECK);
if (method->is_final()) {
*has_final_method = true;
}
// declares_default_methods: declares concrete instance methods, any access flags
// used for interface initialization, and default method inheritance analysis
if (is_interface && !(*declares_default_methods)
&& !method->is_abstract() && !method->is_static()) {
*declares_default_methods = true;
}
_methods->at_put(index, method);
}
if (_need_verify && length > 1) {
// Check duplicated methods
ResourceMark rm(THREAD);
NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, NameSigHash*, HASH_ROW_SIZE);
initialize_hashtable(names_and_sigs);
bool dup = false;
{
debug_only(NoSafepointVerifier nsv;)
for (int i = 0; i < length; i++) {
const Method* const m = _methods->at(i);
// If no duplicates, add name/signature in hashtable names_and_sigs.
if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
dup = true;
break;
}
}
}
if (dup) {
classfile_parse_error("Duplicate method name&signature in class file %s",
CHECK);
}
}
}
}
static const intArray* sort_methods(Array<Method*>* methods) {
const int length = methods->length();
// If JVMTI original method ordering or sharing is enabled we have to
// remember the original class file ordering.
// We temporarily use the vtable_index field in the Method* to store the
// class file index, so we can read in after calling qsort.
// Put the method ordering in the shared archive.
if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
for (int index = 0; index < length; index++) {
Method* const m = methods->at(index);
assert(!m->valid_vtable_index(), "vtable index should not be set");
m->set_vtable_index(index);
}
}
// Sort method array by ascending method name (for faster lookups & vtable construction)
// Note that the ordering is not alphabetical, see Symbol::fast_compare
Method::sort_methods(methods);
intArray* method_ordering = NULL;
// If JVMTI original method ordering or sharing is enabled construct int
// array remembering the original ordering
if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
method_ordering = new intArray(length, length, -1);
for (int index = 0; index < length; index++) {
Method* const m = methods->at(index);
const int old_index = m->vtable_index();
assert(old_index >= 0 && old_index < length, "invalid method index");
method_ordering->at_put(index, old_index);
m->set_vtable_index(Method::invalid_vtable_index);
}
}
return method_ordering;
}
// Parse generic_signature attribute for methods and fields
u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
TRAPS) {
assert(cfs != NULL, "invariant");
cfs->guarantee_more(2, CHECK_0); // generic_signature_index
const u2 generic_signature_index = cfs->get_u2_fast();
check_property(
valid_symbol_at(generic_signature_index),
"Invalid Signature attribute at constant pool index %u in class file %s",
generic_signature_index, CHECK_0);
return generic_signature_index;
}
void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
TRAPS) {
assert(cfs != NULL, "invariant");
cfs->guarantee_more(2, CHECK); // sourcefile_index
const u2 sourcefile_index = cfs->get_u2_fast();
check_property(
valid_symbol_at(sourcefile_index),
"Invalid SourceFile attribute at constant pool index %u in class file %s",
sourcefile_index, CHECK);
set_class_sourcefile_index(sourcefile_index);
}
void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
int length,
TRAPS) {
assert(cfs != NULL, "invariant");
const u1* const sde_buffer = cfs->get_u1_buffer();
assert(sde_buffer != NULL, "null sde buffer");
// Don't bother storing it if there is no way to retrieve it
if (JvmtiExport::can_get_source_debug_extension()) {
assert((length+1) > length, "Overflow checking");
u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
for (int i = 0; i < length; i++) {
sde[i] = sde_buffer[i];
}
sde[length] = '\0';
set_class_sde_buffer((const char*)sde, length);
}
// Got utf8 string, set stream position forward
cfs->skip_u1(length, CHECK);
}
// Inner classes can be static, private or protected (classic VM does this)
#define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
JVM_ACC_PRIVATE | \
JVM_ACC_PROTECTED | \
JVM_ACC_STATIC \
)
// Return number of classes in the inner classes attribute table
u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
const u1* const inner_classes_attribute_start,
bool parsed_enclosingmethod_attribute,
u2 enclosing_method_class_index,
u2 enclosing_method_method_index,
TRAPS) {
const u1* const current_mark = cfs->current();
u2 length = 0;
if (inner_classes_attribute_start != NULL) {
cfs->set_current(inner_classes_attribute_start);
cfs->guarantee_more(2, CHECK_0); // length
length = cfs->get_u2_fast();
}
// 4-tuples of shorts of inner classes data and 2 shorts of enclosing
// method data:
// [inner_class_info_index,
// outer_class_info_index,
// inner_name_index,
// inner_class_access_flags,
// ...
// enclosing_method_class_index,
// enclosing_method_method_index]
const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
_inner_classes = inner_classes;
int index = 0;
const int cp_size = _cp->length();
cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2
for (int n = 0; n < length; n++) {
// Inner class index
const u2 inner_class_info_index = cfs->get_u2_fast();
check_property(
valid_klass_reference_at(inner_class_info_index),
"inner_class_info_index %u has bad constant type in class file %s",
inner_class_info_index, CHECK_0);
// Outer class index
const u2 outer_class_info_index = cfs->get_u2_fast();
check_property(
outer_class_info_index == 0 ||
valid_klass_reference_at(outer_class_info_index),
"outer_class_info_index %u has bad constant type in class file %s",
outer_class_info_index, CHECK_0);
// Inner class name
const u2 inner_name_index = cfs->get_u2_fast();
check_property(
inner_name_index == 0 || valid_symbol_at(inner_name_index),
"inner_name_index %u has bad constant type in class file %s",
inner_name_index, CHECK_0);
if (_need_verify) {
guarantee_property(inner_class_info_index != outer_class_info_index,
"Class is both outer and inner class in class file %s", CHECK_0);
}
// Access flags
jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
// Set abstract bit for old class files for backward compatibility
flags |= JVM_ACC_ABSTRACT;
}
verify_legal_class_modifiers(flags, CHECK_0);
AccessFlags inner_access_flags(flags);
inner_classes->at_put(index++, inner_class_info_index);
inner_classes->at_put(index++, outer_class_info_index);
inner_classes->at_put(index++, inner_name_index);
inner_classes->at_put(index++, inner_access_flags.as_short());
}
// 4347400: make sure there's no duplicate entry in the classes array
if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
for(int i = 0; i < length * 4; i += 4) {
for(int j = i + 4; j < length * 4; j += 4) {
guarantee_property((inner_classes->at(i) != inner_classes->at(j) ||
inner_classes->at(i+1) != inner_classes->at(j+1) ||
inner_classes->at(i+2) != inner_classes->at(j+2) ||
inner_classes->at(i+3) != inner_classes->at(j+3)),
"Duplicate entry in InnerClasses in class file %s",
CHECK_0);
}
}
}
// Set EnclosingMethod class and method indexes.
if (parsed_enclosingmethod_attribute) {
inner_classes->at_put(index++, enclosing_method_class_index);
inner_classes->at_put(index++, enclosing_method_method_index);
}
assert(index == size, "wrong size");
// Restore buffer's current position.
cfs->set_current(current_mark);
return length;
}
void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
set_class_synthetic_flag(true);
}
void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
assert(cfs != NULL, "invariant");
const u2 signature_index = cfs->get_u2(CHECK);
check_property(
valid_symbol_at(signature_index),
"Invalid constant pool index %u in Signature attribute in class file %s",
signature_index, CHECK);
set_class_generic_signature_index(signature_index);
}
void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
ConstantPool* cp,
u4 attribute_byte_length,
TRAPS) {
assert(cfs != NULL, "invariant");
assert(cp != NULL, "invariant");
const u1* const current_start = cfs->current();
guarantee_property(attribute_byte_length >= sizeof(u2),
"Invalid BootstrapMethods attribute length %u in class file %s",
attribute_byte_length,
CHECK);
cfs->guarantee_more(attribute_byte_length, CHECK);
const int attribute_array_length = cfs->get_u2_fast();
guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
"Short length on BootstrapMethods in class file %s",
CHECK);
// The attribute contains a counted array of counted tuples of shorts,
// represending bootstrap specifiers:
// length*{bootstrap_method_index, argument_count*{argument_index}}
const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
// operand_count = number of shorts in attr, except for leading length
// The attribute is copied into a short[] array.
// The array begins with a series of short[2] pairs, one for each tuple.
const int index_size = (attribute_array_length * 2);
Array<u2>* const operands =
MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
// Eagerly assign operands so they will be deallocated with the constant
// pool if there is an error.
cp->set_operands(operands);
int operand_fill_index = index_size;
const int cp_size = cp->length();
for (int n = 0; n < attribute_array_length; n++) {
// Store a 32-bit offset into the header of the operand array.
ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
// Read a bootstrap specifier.
cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc
const u2 bootstrap_method_index = cfs->get_u2_fast();
const u2 argument_count = cfs->get_u2_fast();
check_property(
valid_cp_range(bootstrap_method_index, cp_size) &&
cp->tag_at(bootstrap_method_index).is_method_handle(),
"bootstrap_method_index %u has bad constant type in class file %s",
bootstrap_method_index,
CHECK);
guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
"Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
CHECK);
operands->at_put(operand_fill_index++, bootstrap_method_index);
operands->at_put(operand_fill_index++, argument_count);
cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc]
for (int j = 0; j < argument_count; j++) {
const u2 argument_index = cfs->get_u2_fast();
check_property(
valid_cp_range(argument_index, cp_size) &&
cp->tag_at(argument_index).is_loadable_constant(),
"argument_index %u has bad constant type in class file %s",
argument_index,
CHECK);
operands->at_put(operand_fill_index++, argument_index);
}
}
guarantee_property(current_start + attribute_byte_length == cfs->current(),
"Bad length on BootstrapMethods in class file %s",
CHECK);
}
void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
ConstantPool* cp,
ClassFileParser::ClassAnnotationCollector* parsed_annotations,
TRAPS) {
assert(cfs != NULL, "invariant");
assert(cp != NULL, "invariant");
assert(parsed_annotations != NULL, "invariant");
// Set inner classes attribute to default sentinel
_inner_classes = Universe::the_empty_short_array();
cfs->guarantee_more(2, CHECK); // attributes_count
u2 attributes_count = cfs->get_u2_fast();
bool parsed_sourcefile_attribute = false;
bool parsed_innerclasses_attribute = false;
bool parsed_enclosingmethod_attribute = false;
bool parsed_bootstrap_methods_attribute = false;
const u1* runtime_visible_annotations = NULL;
int runtime_visible_annotations_length = 0;
const u1* runtime_invisible_annotations = NULL;
int runtime_invisible_annotations_length = 0;
const u1* runtime_visible_type_annotations = NULL;
int runtime_visible_type_annotations_length = 0;
const u1* runtime_invisible_type_annotations = NULL;
int runtime_invisible_type_annotations_length = 0;
bool runtime_invisible_type_annotations_exists = false;
bool runtime_invisible_annotations_exists = false;
bool parsed_source_debug_ext_annotations_exist = false;
const u1* inner_classes_attribute_start = NULL;
u4 inner_classes_attribute_length = 0;
u2 enclosing_method_class_index = 0;
u2 enclosing_method_method_index = 0;
// Iterate over attributes
while (attributes_count--) {
cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
const u2 attribute_name_index = cfs->get_u2_fast();
const u4 attribute_length = cfs->get_u4_fast();
check_property(
valid_symbol_at(attribute_name_index),
"Attribute name has bad constant pool index %u in class file %s",
attribute_name_index, CHECK);
const Symbol* const tag = cp->symbol_at(attribute_name_index);
if (tag == vmSymbols::tag_source_file()) {
// Check for SourceFile tag
if (_need_verify) {
guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
}
if (parsed_sourcefile_attribute) {
classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
} else {
parsed_sourcefile_attribute = true;
}
parse_classfile_sourcefile_attribute(cfs, CHECK);
} else if (tag == vmSymbols::tag_source_debug_extension()) {
// Check for SourceDebugExtension tag
if (parsed_source_debug_ext_annotations_exist) {
classfile_parse_error(
"Multiple SourceDebugExtension attributes in class file %s", CHECK);
}
parsed_source_debug_ext_annotations_exist = true;
parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
} else if (tag == vmSymbols::tag_inner_classes()) {
// Check for InnerClasses tag
if (parsed_innerclasses_attribute) {
classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
} else {
parsed_innerclasses_attribute = true;
}
inner_classes_attribute_start = cfs->get_u1_buffer();
inner_classes_attribute_length = attribute_length;
cfs->skip_u1(inner_classes_attribute_length, CHECK);
} else if (tag == vmSymbols::tag_synthetic()) {
// Check for Synthetic tag
// Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
if (attribute_length != 0) {
classfile_parse_error(
"Invalid Synthetic classfile attribute length %u in class file %s",
attribute_length, CHECK);
}
parse_classfile_synthetic_attribute(CHECK);
} else if (tag == vmSymbols::tag_deprecated()) {
// Check for Deprecatd tag - 4276120
if (attribute_length != 0) {
classfile_parse_error(
"Invalid Deprecated classfile attribute length %u in class file %s",
attribute_length, CHECK);
}
} else if (_major_version >= JAVA_1_5_VERSION) {
if (tag == vmSymbols::tag_signature()) {
if (attribute_length != 2) {
classfile_parse_error(
"Wrong Signature attribute length %u in class file %s",
attribute_length, CHECK);
}
parse_classfile_signature_attribute(cfs, CHECK);
} else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
if (runtime_visible_annotations != NULL) {
classfile_parse_error(
"Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
}
runtime_visible_annotations_length = attribute_length;
runtime_visible_annotations = cfs->get_u1_buffer();
assert(runtime_visible_annotations != NULL, "null visible annotations");
parse_annotations(cp,
runtime_visible_annotations,
runtime_visible_annotations_length,
parsed_annotations,
_loader_data,
CHECK);
cfs->skip_u1(runtime_visible_annotations_length, CHECK);
} else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
if (runtime_invisible_annotations_exists) {
classfile_parse_error(
"Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
}
runtime_invisible_annotations_exists = true;
if (PreserveAllAnnotations) {
runtime_invisible_annotations_length = attribute_length;
runtime_invisible_annotations = cfs->get_u1_buffer();
assert(runtime_invisible_annotations != NULL, "null invisible annotations");
}
cfs->skip_u1(attribute_length, CHECK);
} else if (tag == vmSymbols::tag_enclosing_method()) {
if (parsed_enclosingmethod_attribute) {
classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
} else {
parsed_enclosingmethod_attribute = true;
}
guarantee_property(attribute_length == 4,
"Wrong EnclosingMethod attribute length %u in class file %s",
attribute_length, CHECK);
cfs->guarantee_more(4, CHECK); // class_index, method_index
enclosing_method_class_index = cfs->get_u2_fast();
enclosing_method_method_index = cfs->get_u2_fast();
if (enclosing_method_class_index == 0) {
classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
}
// Validate the constant pool indices and types
check_property(valid_klass_reference_at(enclosing_method_class_index),
"Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
if (enclosing_method_method_index != 0 &&
(!cp->is_within_bounds(enclosing_method_method_index) ||
!cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
}
} else if (tag == vmSymbols::tag_bootstrap_methods() &&
_major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
if (parsed_bootstrap_methods_attribute)
classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
parsed_bootstrap_methods_attribute = true;
parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
} else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
if (runtime_visible_type_annotations != NULL) {
classfile_parse_error(
"Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
}
runtime_visible_type_annotations_length = attribute_length;
runtime_visible_type_annotations = cfs->get_u1_buffer();
assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
// No need for the VM to parse Type annotations
cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
} else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
if (runtime_invisible_type_annotations_exists) {
classfile_parse_error(
"Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
} else {
runtime_invisible_type_annotations_exists = true;
}
if (PreserveAllAnnotations) {
runtime_invisible_type_annotations_length = attribute_length;
runtime_invisible_type_annotations = cfs->get_u1_buffer();
assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
}
cfs->skip_u1(attribute_length, CHECK);
} else {
// Unknown attribute
cfs->skip_u1(attribute_length, CHECK);
}
} else {
// Unknown attribute
cfs->skip_u1(attribute_length, CHECK);
}
}
_annotations = assemble_annotations(runtime_visible_annotations,
runtime_visible_annotations_length,
runtime_invisible_annotations,
runtime_invisible_annotations_length,
CHECK);
_type_annotations = assemble_annotations(runtime_visible_type_annotations,
runtime_visible_type_annotations_length,
runtime_invisible_type_annotations,
runtime_invisible_type_annotations_length,
CHECK);
if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
const u2 num_of_classes = parse_classfile_inner_classes_attribute(
cfs,
inner_classes_attribute_start,
parsed_innerclasses_attribute,
enclosing_method_class_index,
enclosing_method_method_index,
CHECK);
if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
guarantee_property(
inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
"Wrong InnerClasses attribute length in class file %s", CHECK);
}
}
if (_max_bootstrap_specifier_index >= 0) {
guarantee_property(parsed_bootstrap_methods_attribute,
"Missing BootstrapMethods attribute in class file %s", CHECK);
}
}
void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
assert(k != NULL, "invariant");
if (_synthetic_flag)
k->set_is_synthetic();
if (_sourcefile_index != 0) {
k->set_source_file_name_index(_sourcefile_index);
}
if (_generic_signature_index != 0) {
k->set_generic_signature_index(_generic_signature_index);
}
if (_sde_buffer != NULL) {
k->set_source_debug_extension(_sde_buffer, _sde_length);
}
}
// Create the Annotations object that will
// hold the annotations array for the Klass.
void ClassFileParser::create_combined_annotations(TRAPS) {
if (_annotations == NULL &&
_type_annotations == NULL &&
_fields_annotations == NULL &&
_fields_type_annotations == NULL) {
// Don't create the Annotations object unnecessarily.
return;
}
Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
annotations->set_class_annotations(_annotations);
annotations->set_class_type_annotations(_type_annotations);
annotations->set_fields_annotations(_fields_annotations);
annotations->set_fields_type_annotations(_fields_type_annotations);
// This is the Annotations object that will be
// assigned to InstanceKlass being constructed.
_combined_annotations = annotations;
// The annotations arrays below has been transfered the
// _combined_annotations so these fields can now be cleared.
_annotations = NULL;
_type_annotations = NULL;
_fields_annotations = NULL;
_fields_type_annotations = NULL;
}
// Transfer ownership of metadata allocated to the InstanceKlass.
void ClassFileParser::apply_parsed_class_metadata(
InstanceKlass* this_klass,
int java_fields_count, TRAPS) {
assert(this_klass != NULL, "invariant");
_cp->set_pool_holder(this_klass);
this_klass->set_constants(_cp);
this_klass->set_fields(_fields, java_fields_count);
this_klass->set_methods(_methods);
this_klass->set_inner_classes(_inner_classes);
this_klass->set_local_interfaces(_local_interfaces);
this_klass->set_transitive_interfaces(_transitive_interfaces);
this_klass->set_annotations(_combined_annotations);
// Clear out these fields so they don't get deallocated by the destructor
clear_class_metadata();
}
AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
int runtime_visible_annotations_length,
const u1* const runtime_invisible_annotations,
int runtime_invisible_annotations_length,
TRAPS) {
AnnotationArray* annotations = NULL;
if (runtime_visible_annotations != NULL ||
runtime_invisible_annotations != NULL) {
annotations = MetadataFactory::new_array<u1>(_loader_data,
runtime_visible_annotations_length +
runtime_invisible_annotations_length,
CHECK_(annotations));
if (runtime_visible_annotations != NULL) {
for (int i = 0; i < runtime_visible_annotations_length; i++) {
annotations->at_put(i, runtime_visible_annotations[i]);
}
}
if (runtime_invisible_annotations != NULL) {
for (int i = 0; i < runtime_invisible_annotations_length; i++) {
int append = runtime_visible_annotations_length+i;
annotations->at_put(append, runtime_invisible_annotations[i]);
}
}
}
return annotations;
}
const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
const int super_class_index,
const bool need_verify,
TRAPS) {
assert(cp != NULL, "invariant");
const InstanceKlass* super_klass = NULL;
if (super_class_index == 0) {
check_property(_class_name == vmSymbols::java_lang_Object(),
"Invalid superclass index %u in class file %s",
super_class_index,
CHECK_NULL);
} else {
check_property(valid_klass_reference_at(super_class_index),
"Invalid superclass index %u in class file %s",
super_class_index,
CHECK_NULL);
// The class name should be legal because it is checked when parsing constant pool.
// However, make sure it is not an array type.
bool is_array = false;
if (cp->tag_at(super_class_index).is_klass()) {
super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
if (need_verify)
is_array = super_klass->is_array_klass();
} else if (need_verify) {
is_array = (cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
}
if (need_verify) {
guarantee_property(!is_array,
"Bad superclass name in class file %s", CHECK_NULL);
}
}
return super_klass;
}
static unsigned int compute_oop_map_count(const InstanceKlass* super,
unsigned int nonstatic_oop_map_count,
int first_nonstatic_oop_offset) {
unsigned int map_count =
NULL == super ? 0 : super->nonstatic_oop_map_count();
if (nonstatic_oop_map_count > 0) {
// We have oops to add to map
if (map_count == 0) {
map_count = nonstatic_oop_map_count;
}
else {
// Check whether we should add a new map block or whether the last one can
// be extended
const OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
const OopMapBlock* const last_map = first_map + map_count - 1;
const int next_offset = last_map->offset() + last_map->count() * heapOopSize;
if (next_offset == first_nonstatic_oop_offset) {
// There is no gap bettwen superklass's last oop field and first
// local oop field, merge maps.
nonstatic_oop_map_count -= 1;
}
else {
// Superklass didn't end with a oop field, add extra maps
assert(next_offset < first_nonstatic_oop_offset, "just checking");
}
map_count += nonstatic_oop_map_count;
}
}
return map_count;
}
#ifndef PRODUCT
static void print_field_layout(const Symbol* name,
Array<u2>* fields,
constantPoolHandle cp,
int instance_size,
int instance_fields_start,
int instance_fields_end,
int static_fields_end) {
assert(name != NULL, "invariant");
tty->print("%s: field layout\n", name->as_klass_external_name());
tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---");
for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
if (!fs.access_flags().is_static()) {
tty->print(" @%3d \"%s\" %s\n",
fs.offset(),
fs.name()->as_klass_external_name(),
fs.signature()->as_klass_external_name());
}
}
tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---");
tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
if (fs.access_flags().is_static()) {
tty->print(" @%3d \"%s\" %s\n",
fs.offset(),
fs.name()->as_klass_external_name(),
fs.signature()->as_klass_external_name());
}
}
tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---");
tty->print("\n");
}
#endif
// Values needed for oopmap and InstanceKlass creation
class ClassFileParser::FieldLayoutInfo : public ResourceObj {
public:
int* nonstatic_oop_offsets;
unsigned int* nonstatic_oop_counts;
unsigned int nonstatic_oop_map_count;
unsigned int total_oop_map_count;
int instance_size;
int nonstatic_field_size;
int static_field_size;
bool has_nonstatic_fields;
};
// Layout fields and fill in FieldLayoutInfo. Could use more refactoring!
void ClassFileParser::layout_fields(ConstantPool* cp,
const FieldAllocationCount* fac,
const ClassAnnotationCollector* parsed_annotations,
FieldLayoutInfo* info,
TRAPS) {
assert(cp != NULL, "invariant");
// Field size and offset computation
int nonstatic_field_size = _super_klass == NULL ? 0 :
_super_klass->nonstatic_field_size();
// Count the contended fields by type.
//
// We ignore static fields, because @Contended is not supported for them.
// The layout code below will also ignore the static fields.
int nonstatic_contended_count = 0;
FieldAllocationCount fac_contended;
for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
if (fs.is_contended()) {
fac_contended.count[atype]++;
if (!fs.access_flags().is_static()) {
nonstatic_contended_count++;
}
}
}
// Calculate the starting byte offsets
int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields();
int next_static_double_offset = next_static_oop_offset +
((fac->count[STATIC_OOP]) * heapOopSize);
if ( fac->count[STATIC_DOUBLE] &&
(Universe::field_type_should_be_aligned(T_DOUBLE) ||
Universe::field_type_should_be_aligned(T_LONG)) ) {
next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
}
int next_static_word_offset = next_static_double_offset +
((fac->count[STATIC_DOUBLE]) * BytesPerLong);
int next_static_short_offset = next_static_word_offset +
((fac->count[STATIC_WORD]) * BytesPerInt);
int next_static_byte_offset = next_static_short_offset +
((fac->count[STATIC_SHORT]) * BytesPerShort);
int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() +
nonstatic_field_size * heapOopSize;
int next_nonstatic_field_offset = nonstatic_fields_start;
const bool is_contended_class = parsed_annotations->is_contended();
// Class is contended, pad before all the fields
if (is_contended_class) {
next_nonstatic_field_offset += ContendedPaddingWidth;
}
// Compute the non-contended fields count.
// The packing code below relies on these counts to determine if some field
// can be squeezed into the alignment gap. Contended fields are obviously
// exempt from that.
unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD];
unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT];
unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE];
unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP];
// Total non-static fields count, including every contended field
unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
fac->count[NONSTATIC_OOP];
const bool super_has_nonstatic_fields =
(_super_klass != NULL && _super_klass->has_nonstatic_fields());
const bool has_nonstatic_fields =
super_has_nonstatic_fields || (nonstatic_fields_count != 0);
// Prepare list of oops for oop map generation.
//
// "offset" and "count" lists are describing the set of contiguous oop
// regions. offset[i] is the start of the i-th region, which then has
// count[i] oops following. Before we know how many regions are required,
// we pessimistically allocate the maps to fit all the oops into the
// distinct regions.
//
// TODO: We add +1 to always allocate non-zero resource arrays; we need
// to figure out if we still need to do this.
unsigned int nonstatic_oop_map_count = 0;
unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1;
int* nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, int, max_nonstatic_oop_maps);
unsigned int* const nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD(
THREAD, unsigned int, max_nonstatic_oop_maps);
int first_nonstatic_oop_offset = 0; // will be set for first oop field
bool compact_fields = CompactFields;
int allocation_style = FieldsAllocationStyle;
if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
assert(false, "0 <= FieldsAllocationStyle <= 2");
allocation_style = 1; // Optimistic
}
// The next classes have predefined hard-coded fields offsets
// (see in JavaClasses::compute_hard_coded_offsets()).
// Use default fields allocation order for them.
if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
(_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
_class_name == vmSymbols::java_lang_Class() ||
_class_name == vmSymbols::java_lang_ClassLoader() ||
_class_name == vmSymbols::java_lang_ref_Reference() ||
_class_name == vmSymbols::java_lang_ref_SoftReference() ||
_class_name == vmSymbols::java_lang_StackTraceElement() ||
_class_name == vmSymbols::java_lang_String() ||
_class_name == vmSymbols::java_lang_Throwable() ||
_class_name == vmSymbols::java_lang_Boolean() ||
_class_name == vmSymbols::java_lang_Character() ||
_class_name == vmSymbols::java_lang_Float() ||
_class_name == vmSymbols::java_lang_Double() ||
_class_name == vmSymbols::java_lang_Byte() ||
_class_name == vmSymbols::java_lang_Short() ||
_class_name == vmSymbols::java_lang_Integer() ||
_class_name == vmSymbols::java_lang_Long())) {
allocation_style = 0; // Allocate oops first
compact_fields = false; // Don't compact fields
}
int next_nonstatic_oop_offset = 0;
int next_nonstatic_double_offset = 0;
// Rearrange fields for a given allocation style
if( allocation_style == 0 ) {
// Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
next_nonstatic_oop_offset = next_nonstatic_field_offset;
next_nonstatic_double_offset = next_nonstatic_oop_offset +
(nonstatic_oop_count * heapOopSize);
} else if( allocation_style == 1 ) {
// Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
next_nonstatic_double_offset = next_nonstatic_field_offset;
} else if( allocation_style == 2 ) {
// Fields allocation: oops fields in super and sub classes are together.
if( nonstatic_field_size > 0 && _super_klass != NULL &&
_super_klass->nonstatic_oop_map_size() > 0 ) {
const unsigned int map_count = _super_klass->nonstatic_oop_map_count();
const OopMapBlock* const first_map = _super_klass->start_of_nonstatic_oop_maps();
const OopMapBlock* const last_map = first_map + map_count - 1;
const int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
if (next_offset == next_nonstatic_field_offset) {
allocation_style = 0; // allocate oops first
next_nonstatic_oop_offset = next_nonstatic_field_offset;
next_nonstatic_double_offset = next_nonstatic_oop_offset +
(nonstatic_oop_count * heapOopSize);
}
}
if( allocation_style == 2 ) {
allocation_style = 1; // allocate oops last
next_nonstatic_double_offset = next_nonstatic_field_offset;
}
} else {
ShouldNotReachHere();
}
int nonstatic_oop_space_count = 0;
int nonstatic_word_space_count = 0;
int nonstatic_short_space_count = 0;
int nonstatic_byte_space_count = 0;
int nonstatic_oop_space_offset = 0;
int nonstatic_word_space_offset = 0;
int nonstatic_short_space_offset = 0;
int nonstatic_byte_space_offset = 0;
// Try to squeeze some of the fields into the gaps due to
// long/double alignment.
if (nonstatic_double_count > 0) {
int offset = next_nonstatic_double_offset;
next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
if (compact_fields && offset != next_nonstatic_double_offset) {
// Allocate available fields into the gap before double field.
int length = next_nonstatic_double_offset - offset;
assert(length == BytesPerInt, "");
nonstatic_word_space_offset = offset;
if (nonstatic_word_count > 0) {
nonstatic_word_count -= 1;
nonstatic_word_space_count = 1; // Only one will fit
length -= BytesPerInt;
offset += BytesPerInt;
}
nonstatic_short_space_offset = offset;
while (length >= BytesPerShort && nonstatic_short_count > 0) {
nonstatic_short_count -= 1;
nonstatic_short_space_count += 1;
length -= BytesPerShort;
offset += BytesPerShort;
}
nonstatic_byte_space_offset = offset;
while (length > 0 && nonstatic_byte_count > 0) {
nonstatic_byte_count -= 1;
nonstatic_byte_space_count += 1;
length -= 1;
}
// Allocate oop field in the gap if there are no other fields for that.
nonstatic_oop_space_offset = offset;
if (length >= heapOopSize && nonstatic_oop_count > 0 &&
allocation_style != 0) { // when oop fields not first
nonstatic_oop_count -= 1;
nonstatic_oop_space_count = 1; // Only one will fit
length -= heapOopSize;
offset += heapOopSize;
}
}
}
int next_nonstatic_word_offset = next_nonstatic_double_offset +
(nonstatic_double_count * BytesPerLong);
int next_nonstatic_short_offset = next_nonstatic_word_offset +
(nonstatic_word_count * BytesPerInt);
int next_nonstatic_byte_offset = next_nonstatic_short_offset +
(nonstatic_short_count * BytesPerShort);
int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
nonstatic_byte_count;
// let oops jump before padding with this allocation style
if( allocation_style == 1 ) {
next_nonstatic_oop_offset = next_nonstatic_padded_offset;
if( nonstatic_oop_count > 0 ) {
next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
}
next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
}
// Iterate over fields again and compute correct offsets.
// The field allocation type was temporarily stored in the offset slot.
// oop fields are located before non-oop fields (static and non-static).
for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
// skip already laid out fields
if (fs.is_offset_set()) continue;
// contended instance fields are handled below
if (fs.is_contended() && !fs.access_flags().is_static()) continue;
int real_offset = 0;
const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
// pack the rest of the fields
switch (atype) {
case STATIC_OOP:
real_offset = next_static_oop_offset;
next_static_oop_offset += heapOopSize;
break;
case STATIC_BYTE:
real_offset = next_static_byte_offset;
next_static_byte_offset += 1;
break;
case STATIC_SHORT:
real_offset = next_static_short_offset;
next_static_short_offset += BytesPerShort;
break;
case STATIC_WORD:
real_offset = next_static_word_offset;
next_static_word_offset += BytesPerInt;
break;
case STATIC_DOUBLE:
real_offset = next_static_double_offset;
next_static_double_offset += BytesPerLong;
break;
case NONSTATIC_OOP:
if( nonstatic_oop_space_count > 0 ) {
real_offset = nonstatic_oop_space_offset;
nonstatic_oop_space_offset += heapOopSize;
nonstatic_oop_space_count -= 1;
} else {
real_offset = next_nonstatic_oop_offset;
next_nonstatic_oop_offset += heapOopSize;
}
// Record this oop in the oop maps
if( nonstatic_oop_map_count > 0 &&
nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
real_offset -
int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
heapOopSize ) {
// This oop is adjacent to the previous one, add to current oop map
assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
} else {
// This oop is not adjacent to the previous one, create new oop map
assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
nonstatic_oop_map_count += 1;
if( first_nonstatic_oop_offset == 0 ) { // Undefined
first_nonstatic_oop_offset = real_offset;
}
}
break;
case NONSTATIC_BYTE:
if( nonstatic_byte_space_count > 0 ) {
real_offset = nonstatic_byte_space_offset;
nonstatic_byte_space_offset += 1;
nonstatic_byte_space_count -= 1;
} else {
real_offset = next_nonstatic_byte_offset;
next_nonstatic_byte_offset += 1;
}
break;
case NONSTATIC_SHORT:
if( nonstatic_short_space_count > 0 ) {
real_offset = nonstatic_short_space_offset;
nonstatic_short_space_offset += BytesPerShort;
nonstatic_short_space_count -= 1;
} else {
real_offset = next_nonstatic_short_offset;
next_nonstatic_short_offset += BytesPerShort;
}
break;
case NONSTATIC_WORD:
if( nonstatic_word_space_count > 0 ) {
real_offset = nonstatic_word_space_offset;
nonstatic_word_space_offset += BytesPerInt;
nonstatic_word_space_count -= 1;
} else {
real_offset = next_nonstatic_word_offset;
next_nonstatic_word_offset += BytesPerInt;
}
break;
case NONSTATIC_DOUBLE:
real_offset = next_nonstatic_double_offset;
next_nonstatic_double_offset += BytesPerLong;
break;
default:
ShouldNotReachHere();
}
fs.set_offset(real_offset);
}
// Handle the contended cases.
//
// Each contended field should not intersect the cache line with another contended field.
// In the absence of alignment information, we end up with pessimistically separating
// the fields with full-width padding.
//
// Additionally, this should not break alignment for the fields, so we round the alignment up
// for each field.
if (nonstatic_contended_count > 0) {
// if there is at least one contended field, we need to have pre-padding for them
next_nonstatic_padded_offset += ContendedPaddingWidth;
// collect all contended groups
BitMap bm(cp->size());
for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
// skip already laid out fields
if (fs.is_offset_set()) continue;
if (fs.is_contended()) {
bm.set_bit(fs.contended_group());
}
}
int current_group = -1;
while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
// skip already laid out fields
if (fs.is_offset_set()) continue;
// skip non-contended fields and fields from different group
if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
// handle statics below
if (fs.access_flags().is_static()) continue;
int real_offset = 0;
FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
switch (atype) {
case NONSTATIC_BYTE:
next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
real_offset = next_nonstatic_padded_offset;
next_nonstatic_padded_offset += 1;
break;
case NONSTATIC_SHORT:
next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
real_offset = next_nonstatic_padded_offset;
next_nonstatic_padded_offset += BytesPerShort;
break;
case NONSTATIC_WORD:
next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
real_offset = next_nonstatic_padded_offset;
next_nonstatic_padded_offset += BytesPerInt;
break;
case NONSTATIC_DOUBLE:
next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
real_offset = next_nonstatic_padded_offset;
next_nonstatic_padded_offset += BytesPerLong;
break;
case NONSTATIC_OOP:
next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
real_offset = next_nonstatic_padded_offset;
next_nonstatic_padded_offset += heapOopSize;
// Record this oop in the oop maps
if( nonstatic_oop_map_count > 0 &&
nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
real_offset -
int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
heapOopSize ) {
// This oop is adjacent to the previous one, add to current oop map
assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
} else {
// This oop is not adjacent to the previous one, create new oop map
assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
nonstatic_oop_map_count += 1;
if( first_nonstatic_oop_offset == 0 ) { // Undefined
first_nonstatic_oop_offset = real_offset;
}
}
break;
default:
ShouldNotReachHere();
}
if (fs.contended_group() == 0) {
// Contended group defines the equivalence class over the fields:
// the fields within the same contended group are not inter-padded.
// The only exception is default group, which does not incur the
// equivalence, and so requires intra-padding.
next_nonstatic_padded_offset += ContendedPaddingWidth;
}
fs.set_offset(real_offset);
} // for
// Start laying out the next group.
// Note that this will effectively pad the last group in the back;
// this is expected to alleviate memory contention effects for
// subclass fields and/or adjacent object.
// If this was the default group, the padding is already in place.
if (current_group != 0) {
next_nonstatic_padded_offset += ContendedPaddingWidth;
}
}
// handle static fields
}
// Entire class is contended, pad in the back.
// This helps to alleviate memory contention effects for subclass fields
// and/or adjacent object.
if (is_contended_class) {
next_nonstatic_padded_offset += ContendedPaddingWidth;
}
int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize);
int static_fields_end = align_size_up(next_static_byte_offset, wordSize);
int static_field_size = (static_fields_end -
InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
nonstatic_field_size = nonstatic_field_size +
(nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
int instance_size = align_object_size(instance_end / wordSize);
assert(instance_size == align_object_size(align_size_up(
(instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
wordSize) / wordSize), "consistent layout helper value");
// Invariant: nonstatic_field end/start should only change if there are
// nonstatic fields in the class, or if the class is contended. We compare
// against the non-aligned value, so that end alignment will not fail the
// assert without actually having the fields.
assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
is_contended_class ||
(nonstatic_fields_count > 0), "double-check nonstatic start/end");
// Number of non-static oop map blocks allocated at end of klass.
const unsigned int total_oop_map_count =
compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
first_nonstatic_oop_offset);
#ifndef PRODUCT
if (PrintFieldLayout) {
print_field_layout(_class_name,
_fields,
cp,
instance_size,
nonstatic_fields_start,
nonstatic_fields_end,
static_fields_end);
}
#endif
// Pass back information needed for InstanceKlass creation
info->nonstatic_oop_offsets = nonstatic_oop_offsets;
info->nonstatic_oop_counts = nonstatic_oop_counts;
info->nonstatic_oop_map_count = nonstatic_oop_map_count;
info->total_oop_map_count = total_oop_map_count;
info->instance_size = instance_size;
info->static_field_size = static_field_size;
info->nonstatic_field_size = nonstatic_field_size;
info->has_nonstatic_fields = has_nonstatic_fields;
}
static void fill_oop_maps(const InstanceKlass* k,
unsigned int nonstatic_oop_map_count,
const int* nonstatic_oop_offsets,
const unsigned int* nonstatic_oop_counts) {
assert(k != NULL, "invariant");
OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
const InstanceKlass* const super = k->superklass();
const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
if (super_count > 0) {
// Copy maps from superklass
OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
for (unsigned int i = 0; i < super_count; ++i) {
*this_oop_map++ = *super_oop_map++;
}
}
if (nonstatic_oop_map_count > 0) {
if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
// The counts differ because there is no gap between superklass's last oop
// field and the first local oop field. Extend the last oop map copied
// from the superklass instead of creating new one.
nonstatic_oop_map_count--;
nonstatic_oop_offsets++;
this_oop_map--;
this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
this_oop_map++;
}
// Add new map blocks, fill them
while (nonstatic_oop_map_count-- > 0) {
this_oop_map->set_offset(*nonstatic_oop_offsets++);
this_oop_map->set_count(*nonstatic_oop_counts++);
this_oop_map++;
}
assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
this_oop_map, "sanity");
}
}
void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
assert(ik != NULL, "invariant");
const Klass* const super = ik->super();
// Check if this klass has an empty finalize method (i.e. one with return bytecode only),
// in which case we don't have to register objects as finalizable
if (!_has_empty_finalizer) {
if (_has_finalizer ||
(super != NULL && super->has_finalizer())) {
ik->set_has_finalizer();
}
}
#ifdef ASSERT
bool f = false;
const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
vmSymbols::void_method_signature());
if (m != NULL && !m->is_empty_method()) {
f = true;
}
// Spec doesn't prevent agent from redefinition of empty finalizer.
// Despite the fact that it's generally bad idea and redefined finalizer
// will not work as expected we shouldn't abort vm in this case
if (!ik->has_redefined_this_or_super()) {
assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
}
#endif
// Check if this klass supports the java.lang.Cloneable interface
if (SystemDictionary::Cloneable_klass_loaded()) {
if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
ik->set_is_cloneable();
}
}
// Check if this klass has a vanilla default constructor
if (super == NULL) {
// java.lang.Object has empty default constructor
ik->set_has_vanilla_constructor();
} else {
if (super->has_vanilla_constructor() &&
_has_vanilla_constructor) {
ik->set_has_vanilla_constructor();
}
#ifdef ASSERT
bool v = false;
if (super->has_vanilla_constructor()) {
const Method* const constructor =
ik->find_method(vmSymbols::object_initializer_name(),
vmSymbols::void_method_signature());
if (constructor != NULL && constructor->is_vanilla_constructor()) {
v = true;
}
}
assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
#endif
}
// If it cannot be fast-path allocated, set a bit in the layout helper.
// See documentation of InstanceKlass::can_be_fastpath_allocated().
assert(ik->size_helper() > 0, "layout_helper is initialized");
if ((!RegisterFinalizersAtInit && ik->has_finalizer())
|| ik->is_abstract() || ik->is_interface()
|| (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
|| ik->size_helper() >= FastAllocateSizeLimit) {
// Forbid fast-path allocation.
const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
ik->set_layout_helper(lh);
}
}
// Attach super classes and interface classes to class loader data
static void record_defined_class_dependencies(const InstanceKlass* defined_klass,
TRAPS) {
assert(defined_klass != NULL, "invariant");
ClassLoaderData* const defining_loader_data = defined_klass->class_loader_data();
if (defining_loader_data->is_the_null_class_loader_data()) {
// Dependencies to null class loader data are implicit.
return;
} else {
// add super class dependency
Klass* const super = defined_klass->super();
if (super != NULL) {
defining_loader_data->record_dependency(super, CHECK);
}
// add super interface dependencies
const Array<Klass*>* const local_interfaces = defined_klass->local_interfaces();
if (local_interfaces != NULL) {
const int length = local_interfaces->length();
for (int i = 0; i < length; i++) {
defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
}
}
}
}
// utility methods for appending an array with check for duplicates
static void append_interfaces(GrowableArray<Klass*>* result,
const Array<Klass*>* const ifs) {
// iterate over new interfaces
for (int i = 0; i < ifs->length(); i++) {
Klass* const e = ifs->at(i);
assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
// add new interface
result->append_if_missing(e);
}
}
static Array<Klass*>* compute_transitive_interfaces(const InstanceKlass* super,
Array<Klass*>* local_ifs,
ClassLoaderData* loader_data,
TRAPS) {
assert(local_ifs != NULL, "invariant");
assert(loader_data != NULL, "invariant");
// Compute maximum size for transitive interfaces
int max_transitive_size = 0;
int super_size = 0;
// Add superclass transitive interfaces size
if (super != NULL) {
super_size = super->transitive_interfaces()->length();
max_transitive_size += super_size;
}
// Add local interfaces' super interfaces
const int local_size = local_ifs->length();
for (int i = 0; i < local_size; i++) {
Klass* const l = local_ifs->at(i);
max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
}
// Finally add local interfaces
max_transitive_size += local_size;
// Construct array
if (max_transitive_size == 0) {
// no interfaces, use canonicalized array
return Universe::the_empty_klass_array();
} else if (max_transitive_size == super_size) {
// no new local interfaces added, share superklass' transitive interface array
return super->transitive_interfaces();
} else if (max_transitive_size == local_size) {
// only local interfaces added, share local interface array
return local_ifs;
} else {
ResourceMark rm;
GrowableArray<Klass*>* const result = new GrowableArray<Klass*>(max_transitive_size);
// Copy down from superclass
if (super != NULL) {
append_interfaces(result, super->transitive_interfaces());
}
// Copy down from local interfaces' superinterfaces
for (int i = 0; i < local_size; i++) {
Klass* const l = local_ifs->at(i);
append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
}
// Finally add local interfaces
append_interfaces(result, local_ifs);
// length will be less than the max_transitive_size if duplicates were removed
const int length = result->length();
assert(length <= max_transitive_size, "just checking");
Array<Klass*>* const new_result =
MetadataFactory::new_array<Klass*>(loader_data, length, CHECK_NULL);
for (int i = 0; i < length; i++) {
Klass* const e = result->at(i);
assert(e != NULL, "just checking");
new_result->at_put(i, e);
}
return new_result;
}
}
static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
assert(this_klass != NULL, "invariant");
const Klass* const super = this_klass->super();
if (super != NULL) {
Reflection::VerifyClassAccessResults vca_result =
Reflection::verify_class_access(this_klass, super, false);
if (vca_result != Reflection::ACCESS_OK) {
ResourceMark rm(THREAD);
char* msg = Reflection::verify_class_access_msg(this_klass, super, vca_result);
if (msg == NULL) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_IllegalAccessError(),
"class %s cannot access its superclass %s",
this_klass->external_name(),
super->external_name());
} else {
// Add additional message content.
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_IllegalAccessError(),
"superclass access check failed: %s",
msg);
}
}
}
}
static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
assert(this_klass != NULL, "invariant");
const Array<Klass*>* const local_interfaces = this_klass->local_interfaces();
const int lng = local_interfaces->length();
for (int i = lng - 1; i >= 0; i--) {
Klass* const k = local_interfaces->at(i);
assert (k != NULL && k->is_interface(), "invalid interface");
Reflection::VerifyClassAccessResults vca_result =
Reflection::verify_class_access(this_klass, k, false);
if (vca_result != Reflection::ACCESS_OK) {
ResourceMark rm(THREAD);
char* msg = Reflection::verify_class_access_msg(this_klass, k, vca_result);
if (msg == NULL) {
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_IllegalAccessError(),
"class %s cannot access its superinterface %s",
this_klass->external_name(),
k->external_name());
} else {
// Add additional message content.
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_IllegalAccessError(),
"superinterface check failed: %s",
msg);
}
}
}
}
static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
assert(this_klass != NULL, "invariant");
const Array<Method*>* const methods = this_klass->methods();
const int num_methods = methods->length();
// go thru each method and check if it overrides a final method
for (int index = 0; index < num_methods; index++) {
const Method* const m = methods->at(index);
// skip private, static, and <init> methods
if ((!m->is_private() && !m->is_static()) &&
(m->name() != vmSymbols::object_initializer_name())) {
const Symbol* const name = m->name();
const Symbol* const signature = m->signature();
const Klass* k = this_klass->super();
const Method* super_m = NULL;
while (k != NULL) {
// skip supers that don't have final methods.
if (k->has_final_method()) {
// lookup a matching method in the super class hierarchy
super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
if (super_m == NULL) {
break; // didn't find any match; get out
}
if (super_m->is_final() && !super_m->is_static() &&
// matching method in super is final, and not static
(Reflection::verify_field_access(this_klass,
super_m->method_holder(),
super_m->method_holder(),
super_m->access_flags(), false))
// this class can access super final method and therefore override
) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_VerifyError(),
"class %s overrides final method %s.%s%s",
this_klass->external_name(),
super_m->method_holder()->external_name(),
name->as_C_string(),
signature->as_C_string()
);
return;
}
// continue to look from super_m's holder's super.
k = super_m->method_holder()->super();
continue;
}
k = k->super();
}
}
}
}
// assumes that this_klass is an interface
static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
assert(this_klass != NULL, "invariant");
assert(this_klass->is_interface(), "not an interface");
const Array<Method*>* methods = this_klass->methods();
const int num_methods = methods->length();
for (int index = 0; index < num_methods; index++) {
const Method* const m = methods->at(index);
// if m is static and not the init method, throw a verify error
if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_VerifyError(),
"Illegal static method %s in interface %s",
m->name()->as_C_string(),
this_klass->external_name()
);
return;
}
}
}
// utility methods for format checking
void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
if (!_need_verify) { return; }
const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
const bool is_final = (flags & JVM_ACC_FINAL) != 0;
const bool is_super = (flags & JVM_ACC_SUPER) != 0;
const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
const bool is_module_info= (flags & JVM_ACC_MODULE) != 0;
const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
if ((is_abstract && is_final) ||
(is_interface && !is_abstract) ||
(is_interface && major_gte_15 && (is_super || is_enum)) ||
(!is_interface && major_gte_15 && is_annotation) ||
is_module_info) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_ClassFormatError(),
"Illegal class modifiers in class %s: 0x%X",
_class_name->as_C_string(), flags
);
return;
}
}
static bool has_illegal_visibility(jint flags) {
const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
return ((is_public && is_protected) ||
(is_public && is_private) ||
(is_protected && is_private));
}
static bool is_supported_version(u2 major, u2 minor){
const u2 max_version = JAVA_MAX_SUPPORTED_VERSION;
return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
(major <= max_version) &&
((major != max_version) ||
(minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
}
void ClassFileParser::verify_legal_field_modifiers(jint flags,
bool is_interface,
TRAPS) const {
if (!_need_verify) { return; }
const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
const bool is_static = (flags & JVM_ACC_STATIC) != 0;
const bool is_final = (flags & JVM_ACC_FINAL) != 0;
const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
bool is_illegal = false;
if (is_interface) {
if (!is_public || !is_static || !is_final || is_private ||
is_protected || is_volatile || is_transient ||
(major_gte_15 && is_enum)) {
is_illegal = true;
}
} else { // not interface
if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
is_illegal = true;
}
}
if (is_illegal) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_ClassFormatError(),
"Illegal field modifiers in class %s: 0x%X",
_class_name->as_C_string(), flags);
return;
}
}
void ClassFileParser::verify_legal_method_modifiers(jint flags,
bool is_interface,
const Symbol* name,
TRAPS) const {
if (!_need_verify) { return; }
const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
const bool is_static = (flags & JVM_ACC_STATIC) != 0;
const bool is_final = (flags & JVM_ACC_FINAL) != 0;
const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
const bool is_initializer = (name == vmSymbols::object_initializer_name());
bool is_illegal = false;
if (is_interface) {
if (major_gte_8) {
// Class file version is JAVA_8_VERSION or later Methods of
// interfaces may set any of the flags except ACC_PROTECTED,
// ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
// have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
(is_native || is_protected || is_final || is_synchronized) ||
// If a specific method of a class or interface has its
// ACC_ABSTRACT flag set, it must not have any of its
// ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
// ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
// check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
// those flags are illegal irrespective of ACC_ABSTRACT being set or not.
(is_abstract && (is_private || is_static || is_strict))) {
is_illegal = true;
}
} else if (major_gte_15) {
// Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
if (!is_public || is_private || is_protected || is_static || is_final ||
is_synchronized || is_native || !is_abstract || is_strict) {
is_illegal = true;
}
} else {
// Class file version is pre-JAVA_1_5_VERSION
if (!is_public || is_static || is_final || is_native || !is_abstract) {
is_illegal = true;
}
}
} else { // not interface
if (has_illegal_visibility(flags)) {
is_illegal = true;
} else {
if (is_initializer) {
if (is_static || is_final || is_synchronized || is_native ||
is_abstract || (major_gte_15 && is_bridge)) {
is_illegal = true;
}
} else { // not initializer
if (is_abstract) {
if ((is_final || is_native || is_private || is_static ||
(major_gte_15 && (is_synchronized || is_strict)))) {
is_illegal = true;
}
}
}
}
}
if (is_illegal) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_ClassFormatError(),
"Method %s in class %s has illegal modifiers: 0x%X",
name->as_C_string(), _class_name->as_C_string(), flags);
return;
}
}
void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
int length,
TRAPS) const {
assert(_need_verify, "only called when _need_verify is true");
if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
}
}
// Unqualified names may not contain the characters '.', ';', '[', or '/'.
// Method names also may not contain the characters '<' or '>', unless <init>
// or <clinit>. Note that method names may not be <init> or <clinit> in this
// method. Because these names have been checked as special cases before
// calling this method in verify_legal_method_name.
//
// This method is also called from the modular system APIs in modules.cpp
// to verify the validity of module and package names.
bool ClassFileParser::verify_unqualified_name(const char* name,
unsigned int length,
int type) {
for (const char* p = name; p != name + length;) {
jchar ch = *p;
if (ch < 128) {
if (ch == '.') {
// permit '.' in module names unless it's the first char, or
// preceding char is also a '.', or last char is a '.'.
if ((type != ClassFileParser::LegalModule) ||
(p == name) || (*(p-1) == '.') ||
(p == name + length - 1)) {
return false;
}
}
if (ch == ';' || ch == '[' ) {
return false; // do not permit '.', ';', or '['
}
if (type != ClassFileParser::LegalClass && ch == '/') {
return false; // do not permit '/' unless it's class name
}
if (type == ClassFileParser::LegalMethod && (ch == '<' || ch == '>')) {
return false; // do not permit '<' or '>' in method names
}
p++;
} else {
char* tmp_p = UTF8::next(p, &ch);
p = tmp_p;
}
}
return true;
}
// Take pointer to a string. Skip over the longest part of the string that could
// be taken as a fieldname. Allow '/' if slash_ok is true.
// Return a pointer to just past the fieldname.
// Return NULL if no fieldname at all was found, or in the case of slash_ok
// being true, we saw consecutive slashes (meaning we were looking for a
// qualified path but found something that was badly-formed).
static const char* skip_over_field_name(const char* name,
bool slash_ok,
unsigned int length) {
const char* p;
jboolean last_is_slash = false;
jboolean not_first_ch = false;
for (p = name; p != name + length; not_first_ch = true) {
const char* old_p = p;
jchar ch = *p;
if (ch < 128) {
p++;
// quick check for ascii
if ((ch >= 'a' && ch <= 'z') ||
(ch >= 'A' && ch <= 'Z') ||
(ch == '_' || ch == '$') ||
(not_first_ch && ch >= '0' && ch <= '9')) {
last_is_slash = false;
continue;
}
if (slash_ok && ch == '/') {
if (last_is_slash) {
return NULL; // Don't permit consecutive slashes
}
last_is_slash = true;
continue;
}
}
else {
jint unicode_ch;
char* tmp_p = UTF8::next_character(p, &unicode_ch);
p = tmp_p;
last_is_slash = false;
// Check if ch is Java identifier start or is Java identifier part
// 4672820: call java.lang.Character methods directly without generating separate tables.
EXCEPTION_MARK;
// return value
JavaValue result(T_BOOLEAN);
// Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
JavaCallArguments args;
args.push_int(unicode_ch);
// public static boolean isJavaIdentifierStart(char ch);
JavaCalls::call_static(&result,
SystemDictionary::Character_klass(),
vmSymbols::isJavaIdentifierStart_name(),
vmSymbols::int_bool_signature(),
&args,
THREAD);
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION;
return 0;
}
if (result.get_jboolean()) {
continue;
}
if (not_first_ch) {
// public static boolean isJavaIdentifierPart(char ch);
JavaCalls::call_static(&result,
SystemDictionary::Character_klass(),
vmSymbols::isJavaIdentifierPart_name(),
vmSymbols::int_bool_signature(),
&args,
THREAD);
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION;
return 0;
}
if (result.get_jboolean()) {
continue;
}
}
}
return (not_first_ch) ? old_p : NULL;
}
return (not_first_ch) ? p : NULL;
}
// Take pointer to a string. Skip over the longest part of the string that could
// be taken as a field signature. Allow "void" if void_ok.
// Return a pointer to just past the signature.
// Return NULL if no legal signature is found.
const char* ClassFileParser::skip_over_field_signature(const char* signature,
bool void_ok,
unsigned int length,
TRAPS) const {
unsigned int array_dim = 0;
while (length > 0) {
switch (signature[0]) {
case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
case JVM_SIGNATURE_BOOLEAN:
case JVM_SIGNATURE_BYTE:
case JVM_SIGNATURE_CHAR:
case JVM_SIGNATURE_SHORT:
case JVM_SIGNATURE_INT:
case JVM_SIGNATURE_FLOAT:
case JVM_SIGNATURE_LONG:
case JVM_SIGNATURE_DOUBLE:
return signature + 1;
case JVM_SIGNATURE_CLASS: {
if (_major_version < JAVA_1_5_VERSION) {
// Skip over the class name if one is there
const char* const p = skip_over_field_name(signature + 1, true, --length);
// The next character better be a semicolon
if (p && (p - signature) > 1 && p[0] == ';') {
return p + 1;
}
}
else {
// 4900761: For class version > 48, any unicode is allowed in class name.
length--;
signature++;
while (length > 0 && signature[0] != ';') {
if (signature[0] == '.') {
classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
}
length--;
signature++;
}
if (signature[0] == ';') { return signature + 1; }
}
return NULL;
}
case JVM_SIGNATURE_ARRAY:
array_dim++;
if (array_dim > 255) {
// 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
}
// The rest of what's there better be a legal signature
signature++;
length--;
void_ok = false;
break;
default:
return NULL;
}
}
return NULL;
}
// Checks if name is a legal class name.
void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
if (!_need_verify || _relax_verify) { return; }
char buf[fixed_buffer_size];
char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
unsigned int length = name->utf8_length();
bool legal = false;
if (length > 0) {
const char* p;
if (bytes[0] == JVM_SIGNATURE_ARRAY) {
p = skip_over_field_signature(bytes, false, length, CHECK);
legal = (p != NULL) && ((p - bytes) == (int)length);
} else if (_major_version < JAVA_1_5_VERSION) {
if (bytes[0] != '<') {
p = skip_over_field_name(bytes, true, length);
legal = (p != NULL) && ((p - bytes) == (int)length);
}
} else {
// 4900761: relax the constraints based on JSR202 spec
// Class names may be drawn from the entire Unicode character set.
// Identifiers between '/' must be unqualified names.
// The utf8 string has been verified when parsing cpool entries.
legal = verify_unqualified_name(bytes, length, LegalClass);
}
}
if (!legal) {
ResourceMark rm(THREAD);
assert(_class_name != NULL, "invariant");
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_ClassFormatError(),
"Illegal class name \"%s\" in class file %s", bytes,
_class_name->as_C_string()
);
return;
}
}
// Checks if name is a legal field name.
void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
if (!_need_verify || _relax_verify) { return; }
char buf[fixed_buffer_size];
char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
unsigned int length = name->utf8_length();
bool legal = false;
if (length > 0) {
if (_major_version < JAVA_1_5_VERSION) {
if (bytes[0] != '<') {
const char* p = skip_over_field_name(bytes, false, length);
legal = (p != NULL) && ((p - bytes) == (int)length);
}
} else {
// 4881221: relax the constraints based on JSR202 spec
legal = verify_unqualified_name(bytes, length, LegalField);
}
}
if (!legal) {
ResourceMark rm(THREAD);
assert(_class_name != NULL, "invariant");
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_ClassFormatError(),
"Illegal field name \"%s\" in class %s", bytes,
_class_name->as_C_string()
);
return;
}
}
// Checks if name is a legal method name.
void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
if (!_need_verify || _relax_verify) { return; }
assert(name != NULL, "method name is null");
char buf[fixed_buffer_size];
char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
unsigned int length = name->utf8_length();
bool legal = false;
if (length > 0) {
if (bytes[0] == '<') {
if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
legal = true;
}
} else if (_major_version < JAVA_1_5_VERSION) {
const char* p;
p = skip_over_field_name(bytes, false, length);
legal = (p != NULL) && ((p - bytes) == (int)length);
} else {
// 4881221: relax the constraints based on JSR202 spec
legal = verify_unqualified_name(bytes, length, LegalMethod);
}
}
if (!legal) {
ResourceMark rm(THREAD);
assert(_class_name != NULL, "invariant");
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_ClassFormatError(),
"Illegal method name \"%s\" in class %s", bytes,
_class_name->as_C_string()
);
return;
}
}
// Checks if signature is a legal field signature.
void ClassFileParser::verify_legal_field_signature(const Symbol* name,
const Symbol* signature,
TRAPS) const {
if (!_need_verify) { return; }
char buf[fixed_buffer_size];
const char* const bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
const unsigned int length = signature->utf8_length();
const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
if (p == NULL || (p - bytes) != (int)length) {
throwIllegalSignature("Field", name, signature, CHECK);
}
}
// Checks if signature is a legal method signature.
// Returns number of parameters
int ClassFileParser::verify_legal_method_signature(const Symbol* name,
const Symbol* signature,
TRAPS) const {
if (!_need_verify) {
// make sure caller's args_size will be less than 0 even for non-static
// method so it will be recomputed in compute_size_of_parameters().
return -2;
}
// Class initializers cannot have args for class format version >= 51.
if (name == vmSymbols::class_initializer_name() &&
signature != vmSymbols::void_method_signature() &&
_major_version >= JAVA_7_VERSION) {
throwIllegalSignature("Method", name, signature, CHECK_0);
return 0;
}
unsigned int args_size = 0;
char buf[fixed_buffer_size];
const char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
unsigned int length = signature->utf8_length();
const char* nextp;
// The first character must be a '('
if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
length--;
// Skip over legal field signatures
nextp = skip_over_field_signature(p, false, length, CHECK_0);
while ((length > 0) && (nextp != NULL)) {
args_size++;
if (p[0] == 'J' || p[0] == 'D') {
args_size++;
}
length -= nextp - p;
p = nextp;
nextp = skip_over_field_signature(p, false, length, CHECK_0);
}
// The first non-signature thing better be a ')'
if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
length--;
if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
// All internal methods must return void
if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
return args_size;
}
} else {
// Now we better just have a return value
nextp = skip_over_field_signature(p, true, length, CHECK_0);
if (nextp && ((int)length == (nextp - p))) {
return args_size;
}
}
}
}
// Report error
throwIllegalSignature("Method", name, signature, CHECK_0);
return 0;
}
int ClassFileParser::static_field_size() const {
assert(_field_info != NULL, "invariant");
return _field_info->static_field_size;
}
int ClassFileParser::total_oop_map_count() const {
assert(_field_info != NULL, "invariant");
return _field_info->total_oop_map_count;
}
jint ClassFileParser::layout_size() const {
assert(_field_info != NULL, "invariant");
return _field_info->instance_size;
}
static void check_methods_for_intrinsics(const InstanceKlass* ik,
const Array<Method*>* methods) {
assert(ik != NULL, "invariant");
assert(methods != NULL, "invariant");
// Set up Method*::intrinsic_id as soon as we know the names of methods.
// (We used to do this lazily, but now we query it in Rewriter,
// which is eagerly done for every method, so we might as well do it now,
// when everything is fresh in memory.)
const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
if (klass_id != vmSymbols::NO_SID) {
for (int j = 0; j < methods->length(); ++j) {
Method* method = methods->at(j);
method->init_intrinsic_id();
if (CheckIntrinsics) {
// Check if an intrinsic is defined for method 'method',
// but the method is not annotated with @HotSpotIntrinsicCandidate.
if (method->intrinsic_id() != vmIntrinsics::_none &&
!method->intrinsic_candidate()) {
tty->print("Compiler intrinsic is defined for method [%s], "
"but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
method->name_and_sig_as_C_string(),
NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
);
tty->cr();
DEBUG_ONLY(vm_exit(1));
}
// Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
// but there is no intrinsic available for it.
if (method->intrinsic_candidate() &&
method->intrinsic_id() == vmIntrinsics::_none) {
tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
"but no compiler intrinsic is defined for the method.%s",
method->name_and_sig_as_C_string(),
NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
);
tty->cr();
DEBUG_ONLY(vm_exit(1));
}
}
} // end for
#ifdef ASSERT
if (CheckIntrinsics) {
// Check for orphan methods in the current class. A method m
// of a class C is orphan if an intrinsic is defined for method m,
// but class C does not declare m.
// The check is potentially expensive, therefore it is available
// only in debug builds.
for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
if (vmIntrinsics::_compiledLambdaForm == id) {
// The _compiledLamdbdaForm intrinsic is a special marker for bytecode
// generated for the JVM from a LambdaForm and therefore no method
// is defined for it.
continue;
}
if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
// Check if the current class contains a method with the same
// name, flags, signature.
bool match = false;
for (int j = 0; j < methods->length(); ++j) {
const Method* method = methods->at(j);
if (method->intrinsic_id() == id) {
match = true;
break;
}
}
if (!match) {
char buf[1000];
tty->print("Compiler intrinsic is defined for method [%s], "
"but the method is not available in class [%s].%s",
vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
buf, sizeof(buf)),
ik->name()->as_C_string(),
NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
);
tty->cr();
DEBUG_ONLY(vm_exit(1));
}
}
} // end for
} // CheckIntrinsics
#endif // ASSERT
}
}
InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
if (_klass != NULL) {
return _klass;
}
InstanceKlass* const ik =
InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
assert(_klass == ik, "invariant");
return ik;
}
void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
assert(ik != NULL, "invariant");
set_klass_to_deallocate(ik);
assert(_field_info != NULL, "invariant");
assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
assert(ik->nonstatic_oop_map_count() == _field_info->total_oop_map_count,
"sanity");
assert(ik->is_instance_klass(), "sanity");
assert(ik->size_helper() == _field_info->instance_size, "sanity");
// Fill in information already parsed
ik->set_should_verify_class(_need_verify);
// Not yet: supers are done below to support the new subtype-checking fields
ik->set_class_loader_data(_loader_data);
ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
assert(_fac != NULL, "invariant");
ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
// this transfers ownership of a lot of arrays from
// the parser onto the InstanceKlass*
apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
// note that is not safe to use the fields in the parser from this point on
assert(NULL == _cp, "invariant");
assert(NULL == _fields, "invariant");
assert(NULL == _methods, "invariant");
assert(NULL == _inner_classes, "invariant");
assert(NULL == _local_interfaces, "invariant");
assert(NULL == _transitive_interfaces, "invariant");
assert(NULL == _combined_annotations, "invariant");
if (_has_final_method) {
ik->set_has_final_method();
}
ik->copy_method_ordering(_method_ordering, CHECK);
// The InstanceKlass::_methods_jmethod_ids cache
// is managed on the assumption that the initial cache
// size is equal to the number of methods in the class. If
// that changes, then InstanceKlass::idnum_can_increment()
// has to be changed accordingly.
ik->set_initial_method_idnum(ik->methods()->length());
ik->set_name(_class_name);
if (is_anonymous()) {
// I am well known to myself
ik->constants()->klass_at_put(_this_class_index, ik); // eagerly resolve
}
ik->set_minor_version(_minor_version);
ik->set_major_version(_major_version);
ik->set_has_default_methods(_has_default_methods);
ik->set_declares_default_methods(_declares_default_methods);
if (_host_klass != NULL) {
assert (ik->is_anonymous(), "should be the same");
ik->set_host_klass(_host_klass);
}
// Set PackageEntry for this_klass
oop cl = ik->class_loader();
Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
ik->set_package(cld, CHECK);
const Array<Method*>* const methods = ik->methods();
assert(methods != NULL, "invariant");
const int methods_len = methods->length();
check_methods_for_intrinsics(ik, methods);
// Fill in field values obtained by parse_classfile_attributes
if (_parsed_annotations->has_any_annotations()) {
_parsed_annotations->apply_to(ik);
}
apply_parsed_class_attributes(ik);
// Miranda methods
if ((_num_miranda_methods > 0) ||
// if this class introduced new miranda methods or
(_super_klass != NULL && _super_klass->has_miranda_methods())
// super class exists and this class inherited miranda methods
) {
ik->set_has_miranda_methods(); // then set a flag
}
// Fill in information needed to compute superclasses.
ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), CHECK);
// Initialize itable offset tables
klassItable::setup_itable_offset_table(ik);
// Compute transitive closure of interfaces this class implements
// Do final class setup
fill_oop_maps(ik,
_field_info->nonstatic_oop_map_count,
_field_info->nonstatic_oop_offsets,
_field_info->nonstatic_oop_counts);
// Fill in has_finalizer, has_vanilla_constructor, and layout_helper
set_precomputed_flags(ik);
// check if this class can access its super class
check_super_class_access(ik, CHECK);
// check if this class can access its superinterfaces
check_super_interface_access(ik, CHECK);
// check if this class overrides any final method
check_final_method_override(ik, CHECK);
// check that if this class is an interface then it doesn't have static methods
if (ik->is_interface()) {
/* An interface in a JAVA 8 classfile can be static */
if (_major_version < JAVA_8_VERSION) {
check_illegal_static_method(ik, CHECK);
}
}
// Obtain this_klass' module entry
ModuleEntry* module_entry = ik->module();
assert(module_entry != NULL, "module_entry should always be set");
// Obtain java.lang.reflect.Module
Handle module_handle(THREAD, JNIHandles::resolve(module_entry->module()));
// Allocate mirror and initialize static fields
// The create_mirror() call will also call compute_modifiers()
java_lang_Class::create_mirror(ik,
_loader_data->class_loader(),
module_handle,
_protection_domain,
CHECK);
assert(_all_mirandas != NULL, "invariant");
// Generate any default methods - default methods are interface methods
// that have a default implementation. This is new with Lambda project.
if (_has_default_methods ) {
DefaultMethods::generate_default_methods(ik,
_all_mirandas,
CHECK);
}
// Add read edges to the unnamed modules of the bootstrap and app class loaders.
if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
!module_entry->has_default_read_edges()) {
if (!module_entry->set_has_default_read_edges()) {
// We won a potential race
JvmtiExport::add_default_read_edges(module_handle, THREAD);
}
}
// Update the loader_data graph.
record_defined_class_dependencies(ik, CHECK);
ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
if (!is_internal()) {
if (log_is_enabled(Info, classload)) {
ResourceMark rm;
const char* module_name = NULL;
static const size_t modules_image_name_len = strlen(MODULES_IMAGE_NAME);
size_t stream_len = strlen(_stream->source());
// See if _stream->source() ends in "modules"
if (module_entry->is_named() && modules_image_name_len < stream_len &&
(strncmp(_stream->source() + stream_len - modules_image_name_len,
MODULES_IMAGE_NAME, modules_image_name_len) == 0)) {
module_name = module_entry->name()->as_C_string();
}
if (log_is_enabled(Info, classload)) {
ik->print_loading_log(LogLevel::Info, _loader_data, module_name, _stream);
}
// No 'else' here as logging levels are not mutually exclusive
if (log_is_enabled(Debug, classload)) {
ik->print_loading_log(LogLevel::Debug, _loader_data, module_name, _stream);
}
}
if (log_is_enabled(Debug, classresolve)) {
ResourceMark rm;
// print out the superclass.
const char * from = ik->external_name();
if (ik->java_super() != NULL) {
log_debug(classresolve)("%s %s (super)",
from,
ik->java_super()->external_name());
}
// print out each of the interface classes referred to by this class.
const Array<Klass*>* const local_interfaces = ik->local_interfaces();
if (local_interfaces != NULL) {
const int length = local_interfaces->length();
for (int i = 0; i < length; i++) {
const Klass* const k = local_interfaces->at(i);
const char * to = k->external_name();
log_debug(classresolve)("%s %s (interface)", from, to);
}
}
}
}
TRACE_INIT_KLASS_ID(ik);
// If we reach here, all is well.
// Now remove the InstanceKlass* from the _klass_to_deallocate field
// in order for it to not be destroyed in the ClassFileParser destructor.
set_klass_to_deallocate(NULL);
// it's official
set_klass(ik);
debug_only(ik->verify();)
}
ClassFileParser::ClassFileParser(ClassFileStream* stream,
Symbol* name,
ClassLoaderData* loader_data,
Handle protection_domain,
TempNewSymbol* parsed_name,
const Klass* host_klass,
GrowableArray<Handle>* cp_patches,
Publicity pub_level,
TRAPS) :
_stream(stream),
_requested_name(name),
_loader_data(loader_data),
_host_klass(host_klass),
_cp_patches(cp_patches),
_parsed_name(parsed_name),
_super_klass(),
_cp(NULL),
_fields(NULL),
_methods(NULL),
_inner_classes(NULL),
_local_interfaces(NULL),
_transitive_interfaces(NULL),
_combined_annotations(NULL),
_annotations(NULL),
_type_annotations(NULL),
_fields_annotations(NULL),
_fields_type_annotations(NULL),
_klass(NULL),
_klass_to_deallocate(NULL),
_parsed_annotations(NULL),
_fac(NULL),
_field_info(NULL),
_method_ordering(NULL),
_all_mirandas(NULL),
_vtable_size(0),
_itable_size(0),
_num_miranda_methods(0),
_rt(REF_NONE),
_protection_domain(protection_domain),
_access_flags(),
_pub_level(pub_level),
_synthetic_flag(false),
_sde_length(false),
_sde_buffer(NULL),
_sourcefile_index(0),
_generic_signature_index(0),
_major_version(0),
_minor_version(0),
_this_class_index(0),
_super_class_index(0),
_itfs_len(0),
_java_fields_count(0),
_need_verify(false),
_relax_verify(false),
_has_default_methods(false),
_declares_default_methods(false),
_has_final_method(false),
_has_finalizer(false),
_has_empty_finalizer(false),
_has_vanilla_constructor(false),
_max_bootstrap_specifier_index(-1) {
_class_name = name != NULL ? name : vmSymbols::unknown_class_name();
assert(THREAD->is_Java_thread(), "invariant");
assert(_loader_data != NULL, "invariant");
assert(stream != NULL, "invariant");
assert(_stream != NULL, "invariant");
assert(_stream->buffer() == _stream->current(), "invariant");
assert(_class_name != NULL, "invariant");
assert(0 == _access_flags.as_int(), "invariant");
// Figure out whether we can skip format checking (matching classic VM behavior)
if (DumpSharedSpaces) {
// verify == true means it's a 'remote' class (i.e., non-boot class)
// Verification decision is based on BytecodeVerificationRemote flag
// for those classes.
_need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
BytecodeVerificationLocal;
}
else {
_need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
stream->need_verify());
}
// synch back verification state to stream
stream->set_verify(_need_verify);
// Check if verification needs to be relaxed for this class file
// Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
_relax_verify = Verifier::relax_verify_for(_loader_data->class_loader());
parse_stream(stream, CHECK);
post_process_parsed_stream(stream, _cp, CHECK);
}
void ClassFileParser::clear_class_metadata() {
// metadata created before the instance klass is created. Must be
// deallocated if classfile parsing returns an error.
_cp = NULL;
_fields = NULL;
_methods = NULL;
_inner_classes = NULL;
_local_interfaces = NULL;
_transitive_interfaces = NULL;
_combined_annotations = NULL;
_annotations = _type_annotations = NULL;
_fields_annotations = _fields_type_annotations = NULL;
}
// Destructor to clean up
ClassFileParser::~ClassFileParser() {
if (_cp != NULL) {
MetadataFactory::free_metadata(_loader_data, _cp);
}
if (_fields != NULL) {
MetadataFactory::free_array<u2>(_loader_data, _fields);
}
if (_methods != NULL) {
// Free methods
InstanceKlass::deallocate_methods(_loader_data, _methods);
}
// beware of the Universe::empty_blah_array!!
if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
}
// Free interfaces
InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
_local_interfaces, _transitive_interfaces);
if (_combined_annotations != NULL) {
// After all annotations arrays have been created, they are installed into the
// Annotations object that will be assigned to the InstanceKlass being created.
// Deallocate the Annotations object and the installed annotations arrays.
_combined_annotations->deallocate_contents(_loader_data);
// If the _combined_annotations pointer is non-NULL,
// then the other annotations fields should have been cleared.
assert(_annotations == NULL, "Should have been cleared");
assert(_type_annotations == NULL, "Should have been cleared");
assert(_fields_annotations == NULL, "Should have been cleared");
assert(_fields_type_annotations == NULL, "Should have been cleared");
} else {
// If the annotations arrays were not installed into the Annotations object,
// then they have to be deallocated explicitly.
MetadataFactory::free_array<u1>(_loader_data, _annotations);
MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
Annotations::free_contents(_loader_data, _fields_annotations);
Annotations::free_contents(_loader_data, _fields_type_annotations);
}
clear_class_metadata();
// deallocate the klass if already created. Don't directly deallocate, but add
// to the deallocate list so that the klass is removed from the CLD::_klasses list
// at a safepoint.
if (_klass_to_deallocate != NULL) {
_loader_data->add_to_deallocate_list(_klass_to_deallocate);
}
}
void ClassFileParser::parse_stream(const ClassFileStream* const stream,
TRAPS) {
assert(stream != NULL, "invariant");
assert(_class_name != NULL, "invariant");
// BEGIN STREAM PARSING
stream->guarantee_more(8, CHECK); // magic, major, minor
// Magic value
const u4 magic = stream->get_u4_fast();
guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
"Incompatible magic value %u in class file %s",
magic, CHECK);
// Version numbers
_minor_version = stream->get_u2_fast();
_major_version = stream->get_u2_fast();
if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) {
ResourceMark rm;
warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
_major_version, _minor_version, _class_name->as_C_string());
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_UnsupportedClassVersionError(),
"Unsupported major.minor version for dump time %u.%u",
_major_version,
_minor_version);
}
// Check version numbers - we check this even with verifier off
if (!is_supported_version(_major_version, _minor_version)) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_UnsupportedClassVersionError(),
"%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
"this version of the Java Runtime only recognizes class file versions up to %u.%u",
_class_name->as_C_string(),
_major_version,
_minor_version,
JAVA_MAX_SUPPORTED_VERSION,
JAVA_MAX_SUPPORTED_MINOR_VERSION);
return;
}
stream->guarantee_more(3, CHECK); // length, first cp tag
const u2 cp_size = stream->get_u2_fast();
guarantee_property(
cp_size >= 1, "Illegal constant pool size %u in class file %s",
cp_size, CHECK);
_cp = ConstantPool::allocate(_loader_data,
cp_size,
CHECK);
ConstantPool* const cp = _cp;
parse_constant_pool(stream, cp, cp_size, CHECK);
assert(cp_size == (const u2)cp->length(), "invariant");
// ACCESS FLAGS
stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
// Access flags
jint flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
// Set abstract bit for old class files for backward compatibility
flags |= JVM_ACC_ABSTRACT;
}
_access_flags.set_flags(flags);
verify_legal_class_modifiers((jint)_access_flags.as_int(), CHECK);
// This class and superclass
_this_class_index = stream->get_u2_fast();
check_property(
valid_cp_range(_this_class_index, cp_size) &&
cp->tag_at(_this_class_index).is_unresolved_klass(),
"Invalid this class index %u in constant pool in class file %s",
_this_class_index, CHECK);
Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
assert(class_name_in_cp != NULL, "class_name can't be null");
if (_parsed_name != NULL) {
// It's important to set parsed_name *before* resolving the super class.
// (it's used for cleanup by the caller if parsing fails)
*_parsed_name = class_name_in_cp;
// parsed_name is returned and can be used if there's an error, so add to
// its reference count. Caller will decrement the refcount.
(*_parsed_name)->increment_refcount();
}
// Update _class_name which could be null previously
// to reflect the name in the constant pool
_class_name = class_name_in_cp;
// Don't need to check whether this class name is legal or not.
// It has been checked when constant pool is parsed.
// However, make sure it is not an array type.
if (_need_verify) {
guarantee_property(_class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
"Bad class name in class file %s",
CHECK);
}
// Checks if name in class file matches requested name
if (_requested_name != NULL && _requested_name != _class_name) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_NoClassDefFoundError(),
"%s (wrong name: %s)",
_class_name->as_C_string(),
_requested_name != NULL ? _requested_name->as_C_string() : "NoName"
);
return;
}
if (!is_internal()) {
if (log_is_enabled(Debug, classload, preorder)){
ResourceMark rm(THREAD);
outputStream* log = Log(classload, preorder)::debug_stream();
log->print("%s", _class_name->as_klass_external_name());
if (stream->source() != NULL) {
log->print(" source: %s", stream->source());
}
log->cr();
}
#if INCLUDE_CDS
if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
// Only dump the classes that can be stored into CDS archive
if (SystemDictionaryShared::is_sharing_possible(_loader_data)) {
ResourceMark rm(THREAD);
classlist_file->print_cr("%s", _class_name->as_C_string());
classlist_file->flush();
}
}
#endif
}
// SUPERKLASS
_super_class_index = stream->get_u2_fast();
_super_klass = parse_super_class(cp,
_super_class_index,
_need_verify,
CHECK);
// Interfaces
_itfs_len = stream->get_u2_fast();
parse_interfaces(stream,
_itfs_len,
cp,
&_has_default_methods,
CHECK);
assert(_local_interfaces != NULL, "invariant");
// Fields (offsets are filled in later)
_fac = new FieldAllocationCount();
parse_fields(stream,
_access_flags.is_interface(),
_fac,
cp,
cp_size,
&_java_fields_count,
CHECK);
assert(_fields != NULL, "invariant");
// Methods
AccessFlags promoted_flags;
parse_methods(stream,
_access_flags.is_interface(),
&promoted_flags,
&_has_final_method,
&_declares_default_methods,
CHECK);
assert(_methods != NULL, "invariant");
// promote flags from parse_methods() to the klass' flags
_access_flags.add_promoted_flags(promoted_flags.as_int());
if (_declares_default_methods) {
_has_default_methods = true;
}
// Additional attributes/annotations
_parsed_annotations = new ClassAnnotationCollector();
parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
assert(_inner_classes != NULL, "invariant");
// Finalize the Annotations metadata object,
// now that all annotation arrays have been created.
create_combined_annotations(CHECK);
// Make sure this is the end of class file stream
guarantee_property(stream->at_eos(),
"Extra bytes at the end of class file %s",
CHECK);
// all bytes in stream read and parsed
}
void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
ConstantPool* cp,
TRAPS) {
assert(stream != NULL, "invariant");
assert(stream->at_eos(), "invariant");
assert(cp != NULL, "invariant");
assert(_loader_data != NULL, "invariant");
// We check super class after class file is parsed and format is checked
if (_super_class_index > 0 && NULL ==_super_klass) {
Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
if (_access_flags.is_interface()) {
// Before attempting to resolve the superclass, check for class format
// errors not checked yet.
guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
"Interfaces must have java.lang.Object as superclass in class file %s",
CHECK);
}
_super_klass = (const InstanceKlass*)
SystemDictionary::resolve_super_or_fail(_class_name,
super_class_name,
_loader_data->class_loader(),
_protection_domain,
true,
CHECK);
}
if (_super_klass != NULL) {
if (_super_klass->has_default_methods()) {
_has_default_methods = true;
}
if (_super_klass->is_interface()) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_IncompatibleClassChangeError(),
"class %s has interface %s as super class",
_class_name->as_klass_external_name(),
_super_klass->external_name()
);
return;
}
// Make sure super class is not final
if (_super_klass->is_final()) {
THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
}
}
// Compute the transitive list of all unique interfaces implemented by this class
_transitive_interfaces =
compute_transitive_interfaces(_super_klass,
_local_interfaces,
_loader_data,
CHECK);
assert(_transitive_interfaces != NULL, "invariant");
// sort methods
_method_ordering = sort_methods(_methods);
_all_mirandas = new GrowableArray<Method*>(20);
klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
&_num_miranda_methods,
_all_mirandas,
_super_klass,
_methods,
_access_flags,
_loader_data->class_loader(),
_class_name,
_local_interfaces,
CHECK);
// Size of Java itable (in words)
_itable_size = _access_flags.is_interface() ? 0 :
klassItable::compute_itable_size(_transitive_interfaces);
assert(_fac != NULL, "invariant");
assert(_parsed_annotations != NULL, "invariant");
_field_info = new FieldLayoutInfo();
layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
// Compute reference typ
_rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
}
void ClassFileParser::set_klass(InstanceKlass* klass) {
#ifdef ASSERT
if (klass != NULL) {
assert(NULL == _klass, "leaking?");
}
#endif
_klass = klass;
}
void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
#ifdef ASSERT
if (klass != NULL) {
assert(NULL == _klass_to_deallocate, "leaking?");
}
#endif
_klass_to_deallocate = klass;
}
// Caller responsible for ResourceMark
// clone stream with rewound position
const ClassFileStream* ClassFileParser::clone_stream() const {
assert(_stream != NULL, "invariant");
return _stream->clone();
}