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android / platform / libcore / 4be4e2435b44dd460abaadc30d02c1e14f5b266e / . / hotspot / src / share / vm / oops / constantPoolOop.cpp
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/*
* Copyright 1997-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
*/
# include "incls/_precompiled.incl"
# include "incls/_constantPoolOop.cpp.incl"
void constantPoolOopDesc::set_flag_at(FlagBit fb) {
const int MAX_STATE_CHANGES = 2;
for (int i = MAX_STATE_CHANGES + 10; i > 0; i--) {
int oflags = _flags;
int nflags = oflags | (1 << (int)fb);
if (Atomic::cmpxchg(nflags, &_flags, oflags) == oflags)
return;
}
assert(false, "failed to cmpxchg flags");
_flags |= (1 << (int)fb); // better than nothing
}
klassOop constantPoolOopDesc::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
// A resolved constantPool entry will contain a klassOop, otherwise a symbolOop.
// It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
// tag is not updated atomicly.
oop entry = *(this_oop->obj_at_addr(which));
if (entry->is_klass()) {
// Already resolved - return entry.
return (klassOop)entry;
}
// Acquire lock on constant oop while doing update. After we get the lock, we check if another object
// already has updated the object
assert(THREAD->is_Java_thread(), "must be a Java thread");
bool do_resolve = false;
bool in_error = false;
symbolHandle name;
Handle loader;
{ ObjectLocker ol(this_oop, THREAD);
if (this_oop->tag_at(which).is_unresolved_klass()) {
if (this_oop->tag_at(which).is_unresolved_klass_in_error()) {
in_error = true;
} else {
do_resolve = true;
name = symbolHandle(THREAD, this_oop->unresolved_klass_at(which));
loader = Handle(THREAD, instanceKlass::cast(this_oop->pool_holder())->class_loader());
}
}
} // unlocking constantPool
// The original attempt to resolve this constant pool entry failed so find the
// original error and throw it again (JVMS 5.4.3).
if (in_error) {
symbolOop error = SystemDictionary::find_resolution_error(this_oop, which);
guarantee(error != (symbolOop)NULL, "tag mismatch with resolution error table");
ResourceMark rm;
// exception text will be the class name
const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
THROW_MSG_0(error, className);
}
if (do_resolve) {
// this_oop must be unlocked during resolve_or_fail
oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
Handle h_prot (THREAD, protection_domain);
klassOop k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD);
KlassHandle k;
if (!HAS_PENDING_EXCEPTION) {
k = KlassHandle(THREAD, k_oop);
// Do access check for klasses
verify_constant_pool_resolve(this_oop, k, THREAD);
}
// Failed to resolve class. We must record the errors so that subsequent attempts
// to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
if (HAS_PENDING_EXCEPTION) {
ResourceMark rm;
symbolHandle error(PENDING_EXCEPTION->klass()->klass_part()->name());
bool throw_orig_error = false;
{
ObjectLocker ol (this_oop, THREAD);
// some other thread has beaten us and has resolved the class.
if (this_oop->tag_at(which).is_klass()) {
CLEAR_PENDING_EXCEPTION;
entry = this_oop->resolved_klass_at(which);
return (klassOop)entry;
}
if (!PENDING_EXCEPTION->
is_a(SystemDictionary::linkageError_klass())) {
// Just throw the exception and don't prevent these classes from
// being loaded due to virtual machine errors like StackOverflow
// and OutOfMemoryError, etc, or if the thread was hit by stop()
// Needs clarification to section 5.4.3 of the VM spec (see 6308271)
}
else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) {
SystemDictionary::add_resolution_error(this_oop, which, error);
this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError);
} else {
// some other thread has put the class in error state.
error = symbolHandle(SystemDictionary::find_resolution_error(this_oop, which));
assert(!error.is_null(), "checking");
throw_orig_error = true;
}
} // unlocked
if (throw_orig_error) {
CLEAR_PENDING_EXCEPTION;
ResourceMark rm;
const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
THROW_MSG_0(error, className);
}
return 0;
}
if (TraceClassResolution && !k()->klass_part()->oop_is_array()) {
// skip resolving the constant pool so that this code get's
// called the next time some bytecodes refer to this class.
ResourceMark rm;
int line_number = -1;
const char * source_file = NULL;
if (JavaThread::current()->has_last_Java_frame()) {
// try to identify the method which called this function.
vframeStream vfst(JavaThread::current());
if (!vfst.at_end()) {
line_number = vfst.method()->line_number_from_bci(vfst.bci());
symbolOop s = instanceKlass::cast(vfst.method()->method_holder())->source_file_name();
if (s != NULL) {
source_file = s->as_C_string();
}
}
}
if (k() != this_oop->pool_holder()) {
// only print something if the classes are different
if (source_file != NULL) {
tty->print("RESOLVE %s %s %s:%d\n",
instanceKlass::cast(this_oop->pool_holder())->external_name(),
instanceKlass::cast(k())->external_name(), source_file, line_number);
} else {
tty->print("RESOLVE %s %s\n",
instanceKlass::cast(this_oop->pool_holder())->external_name(),
instanceKlass::cast(k())->external_name());
}
}
return k();
} else {
ObjectLocker ol (this_oop, THREAD);
// Only updated constant pool - if it is resolved.
do_resolve = this_oop->tag_at(which).is_unresolved_klass();
if (do_resolve) {
this_oop->klass_at_put(which, k());
}
}
}
entry = this_oop->resolved_klass_at(which);
assert(entry->is_klass(), "must be resolved at this point");
return (klassOop)entry;
}
// Does not update constantPoolOop - to avoid any exception throwing. Used
// by compiler and exception handling. Also used to avoid classloads for
// instanceof operations. Returns NULL if the class has not been loaded or
// if the verification of constant pool failed
klassOop constantPoolOopDesc::klass_at_if_loaded(constantPoolHandle this_oop, int which) {
oop entry = *this_oop->obj_at_addr(which);
if (entry->is_klass()) {
return (klassOop)entry;
} else {
assert(entry->is_symbol(), "must be either symbol or klass");
Thread *thread = Thread::current();
symbolHandle name (thread, (symbolOop)entry);
oop loader = instanceKlass::cast(this_oop->pool_holder())->class_loader();
oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
Handle h_prot (thread, protection_domain);
Handle h_loader (thread, loader);
klassOop k = SystemDictionary::find(name, h_loader, h_prot, thread);
if (k != NULL) {
// Make sure that resolving is legal
EXCEPTION_MARK;
KlassHandle klass(THREAD, k);
// return NULL if verification fails
verify_constant_pool_resolve(this_oop, klass, THREAD);
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION;
return NULL;
}
return klass();
} else {
return k;
}
}
}
klassOop constantPoolOopDesc::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) {
return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which));
}
// This is an interface for the compiler that allows accessing non-resolved entries
// in the constant pool - but still performs the validations tests. Must be used
// in a pre-parse of the compiler - to determine what it can do and not do.
// Note: We cannot update the ConstantPool from the vm_thread.
klassOop constantPoolOopDesc::klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int index, TRAPS) {
int which = this_oop->klass_ref_index_at(index);
oop entry = *this_oop->obj_at_addr(which);
if (entry->is_klass()) {
return (klassOop)entry;
} else {
assert(entry->is_symbol(), "must be either symbol or klass");
symbolHandle name (THREAD, (symbolOop)entry);
oop loader = instanceKlass::cast(this_oop->pool_holder())->class_loader();
oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
Handle h_loader(THREAD, loader);
Handle h_prot (THREAD, protection_domain);
KlassHandle k(THREAD, SystemDictionary::find(name, h_loader, h_prot, THREAD));
// Do access check for klasses
if( k.not_null() ) verify_constant_pool_resolve(this_oop, k, CHECK_NULL);
return k();
}
}
symbolOop constantPoolOopDesc::uncached_name_ref_at(int which) {
jint ref_index = name_and_type_at(uncached_name_and_type_ref_index_at(which));
int name_index = extract_low_short_from_int(ref_index);
return symbol_at(name_index);
}
symbolOop constantPoolOopDesc::uncached_signature_ref_at(int which) {
jint ref_index = name_and_type_at(uncached_name_and_type_ref_index_at(which));
int signature_index = extract_high_short_from_int(ref_index);
return symbol_at(signature_index);
}
int constantPoolOopDesc::uncached_name_and_type_ref_index_at(int which) {
jint ref_index = field_or_method_at(which, true);
return extract_high_short_from_int(ref_index);
}
int constantPoolOopDesc::uncached_klass_ref_index_at(int which) {
jint ref_index = field_or_method_at(which, true);
return extract_low_short_from_int(ref_index);
}
void constantPoolOopDesc::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) {
if (k->oop_is_instance() || k->oop_is_objArray()) {
instanceKlassHandle holder (THREAD, this_oop->pool_holder());
klassOop elem_oop = k->oop_is_instance() ? k() : objArrayKlass::cast(k())->bottom_klass();
KlassHandle element (THREAD, elem_oop);
// The element type could be a typeArray - we only need the access check if it is
// an reference to another class
if (element->oop_is_instance()) {
LinkResolver::check_klass_accessability(holder, element, CHECK);
}
}
}
int constantPoolOopDesc::klass_ref_index_at(int which) {
jint ref_index = field_or_method_at(which, false);
return extract_low_short_from_int(ref_index);
}
int constantPoolOopDesc::name_and_type_ref_index_at(int which) {
jint ref_index = field_or_method_at(which, false);
return extract_high_short_from_int(ref_index);
}
int constantPoolOopDesc::name_ref_index_at(int which) {
jint ref_index = name_and_type_at(which);
return extract_low_short_from_int(ref_index);
}
int constantPoolOopDesc::signature_ref_index_at(int which) {
jint ref_index = name_and_type_at(which);
return extract_high_short_from_int(ref_index);
}
klassOop constantPoolOopDesc::klass_ref_at(int which, TRAPS) {
return klass_at(klass_ref_index_at(which), CHECK_NULL);
}
symbolOop constantPoolOopDesc::klass_name_at(int which) {
assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
"Corrupted constant pool");
// A resolved constantPool entry will contain a klassOop, otherwise a symbolOop.
// It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
// tag is not updated atomicly.
oop entry = *(obj_at_addr(which));
if (entry->is_klass()) {
// Already resolved - return entry's name.
return klassOop(entry)->klass_part()->name();
} else {
assert(entry->is_symbol(), "must be either symbol or klass");
return (symbolOop)entry;
}
}
symbolOop constantPoolOopDesc::klass_ref_at_noresolve(int which) {
jint ref_index = klass_ref_index_at(which);
return klass_at_noresolve(ref_index);
}
char* constantPoolOopDesc::string_at_noresolve(int which) {
// Test entry type in case string is resolved while in here.
oop entry = *(obj_at_addr(which));
if (entry->is_symbol()) {
return ((symbolOop)entry)->as_C_string();
} else if (java_lang_String::is_instance(entry)) {
return java_lang_String::as_utf8_string(entry);
} else {
return (char*)"<pseudo-string>";
}
}
symbolOop constantPoolOopDesc::name_ref_at(int which) {
jint ref_index = name_and_type_at(name_and_type_ref_index_at(which));
int name_index = extract_low_short_from_int(ref_index);
return symbol_at(name_index);
}
symbolOop constantPoolOopDesc::signature_ref_at(int which) {
jint ref_index = name_and_type_at(name_and_type_ref_index_at(which));
int signature_index = extract_high_short_from_int(ref_index);
return symbol_at(signature_index);
}
BasicType constantPoolOopDesc::basic_type_for_signature_at(int which) {
return FieldType::basic_type(symbol_at(which));
}
void constantPoolOopDesc::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) {
for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused
if (this_oop->tag_at(index).is_unresolved_string()) {
this_oop->string_at(index, CHECK);
}
}
}
oop constantPoolOopDesc::string_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
oop entry = *(this_oop->obj_at_addr(which));
if (entry->is_symbol()) {
ObjectLocker ol(this_oop, THREAD);
if (this_oop->tag_at(which).is_unresolved_string()) {
// Intern string
symbolOop sym = this_oop->unresolved_string_at(which);
entry = StringTable::intern(sym, CHECK_(constantPoolOop(NULL)));
this_oop->string_at_put(which, entry);
} else {
// Another thread beat us and interned string, read string from constant pool
entry = this_oop->resolved_string_at(which);
}
}
assert(java_lang_String::is_instance(entry), "must be string");
return entry;
}
bool constantPoolOopDesc::is_pseudo_string_at(int which) {
oop entry = *(obj_at_addr(which));
if (entry->is_symbol())
// Not yet resolved, but it will resolve to a string.
return false;
else if (java_lang_String::is_instance(entry))
return false; // actually, it might be a non-interned or non-perm string
else
// truly pseudo
return true;
}
bool constantPoolOopDesc::klass_name_at_matches(instanceKlassHandle k,
int which) {
// Names are interned, so we can compare symbolOops directly
symbolOop cp_name = klass_name_at(which);
return (cp_name == k->name());
}
int constantPoolOopDesc::pre_resolve_shared_klasses(TRAPS) {
ResourceMark rm;
int count = 0;
for (int index = 1; index < tags()->length(); index++) { // Index 0 is unused
if (tag_at(index).is_unresolved_string()) {
// Intern string
symbolOop sym = unresolved_string_at(index);
oop entry = StringTable::intern(sym, CHECK_(-1));
string_at_put(index, entry);
}
}
return count;
}
// Iterate over symbols which are used as class, field, method names and
// signatures (in preparation for writing to the shared archive).
void constantPoolOopDesc::shared_symbols_iterate(OopClosure* closure) {
for (int index = 1; index < length(); index++) { // Index 0 is unused
switch (tag_at(index).value()) {
case JVM_CONSTANT_UnresolvedClass:
closure->do_oop(obj_at_addr(index));
break;
case JVM_CONSTANT_NameAndType:
{
int i = *int_at_addr(index);
closure->do_oop(obj_at_addr((unsigned)i >> 16));
closure->do_oop(obj_at_addr((unsigned)i & 0xffff));
}
break;
case JVM_CONSTANT_Class:
case JVM_CONSTANT_InterfaceMethodref:
case JVM_CONSTANT_Fieldref:
case JVM_CONSTANT_Methodref:
case JVM_CONSTANT_Integer:
case JVM_CONSTANT_Float:
// Do nothing! Not an oop.
// These constant types do not reference symbols at this point.
break;
case JVM_CONSTANT_String:
// Do nothing! Not a symbol.
break;
case JVM_CONSTANT_UnresolvedString:
case JVM_CONSTANT_Utf8:
// These constants are symbols, but unless these symbols are
// actually to be used for something, we don't want to mark them.
break;
case JVM_CONSTANT_Long:
case JVM_CONSTANT_Double:
// Do nothing! Not an oop. (But takes two pool entries.)
++index;
break;
default:
ShouldNotReachHere();
break;
}
}
}
// Iterate over the [one] tags array (in preparation for writing to the
// shared archive).
void constantPoolOopDesc::shared_tags_iterate(OopClosure* closure) {
closure->do_oop(tags_addr());
}
// Iterate over String objects (in preparation for writing to the shared
// archive).
void constantPoolOopDesc::shared_strings_iterate(OopClosure* closure) {
for (int index = 1; index < length(); index++) { // Index 0 is unused
switch (tag_at(index).value()) {
case JVM_CONSTANT_UnresolvedClass:
case JVM_CONSTANT_NameAndType:
// Do nothing! Not a String.
break;
case JVM_CONSTANT_Class:
case JVM_CONSTANT_InterfaceMethodref:
case JVM_CONSTANT_Fieldref:
case JVM_CONSTANT_Methodref:
case JVM_CONSTANT_Integer:
case JVM_CONSTANT_Float:
// Do nothing! Not an oop.
// These constant types do not reference symbols at this point.
break;
case JVM_CONSTANT_String:
closure->do_oop(obj_at_addr(index));
break;
case JVM_CONSTANT_UnresolvedString:
case JVM_CONSTANT_Utf8:
// These constants are symbols, but unless these symbols are
// actually to be used for something, we don't want to mark them.
break;
case JVM_CONSTANT_Long:
case JVM_CONSTANT_Double:
// Do nothing! Not an oop. (But takes two pool entries.)
++index;
break;
default:
ShouldNotReachHere();
break;
}
}
}
// Compare this constant pool's entry at index1 to the constant pool
// cp2's entry at index2.
bool constantPoolOopDesc::compare_entry_to(int index1, constantPoolHandle cp2,
int index2, TRAPS) {
jbyte t1 = tag_at(index1).value();
jbyte t2 = cp2->tag_at(index2).value();
// JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass
// when comparing
if (t1 == JVM_CONSTANT_UnresolvedClassInError) {
t1 = JVM_CONSTANT_UnresolvedClass;
}
if (t2 == JVM_CONSTANT_UnresolvedClassInError) {
t2 = JVM_CONSTANT_UnresolvedClass;
}
if (t1 != t2) {
// Not the same entry type so there is nothing else to check. Note
// that this style of checking will consider resolved/unresolved
// class pairs and resolved/unresolved string pairs as different.
// From the constantPoolOop API point of view, this is correct
// behavior. See constantPoolKlass::merge() to see how this plays
// out in the context of constantPoolOop merging.
return false;
}
switch (t1) {
case JVM_CONSTANT_Class:
{
klassOop k1 = klass_at(index1, CHECK_false);
klassOop k2 = cp2->klass_at(index2, CHECK_false);
if (k1 == k2) {
return true;
}
} break;
case JVM_CONSTANT_ClassIndex:
{
int recur1 = klass_index_at(index1);
int recur2 = cp2->klass_index_at(index2);
bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
if (match) {
return true;
}
} break;
case JVM_CONSTANT_Double:
{
jdouble d1 = double_at(index1);
jdouble d2 = cp2->double_at(index2);
if (d1 == d2) {
return true;
}
} break;
case JVM_CONSTANT_Fieldref:
case JVM_CONSTANT_InterfaceMethodref:
case JVM_CONSTANT_Methodref:
{
int recur1 = uncached_klass_ref_index_at(index1);
int recur2 = cp2->uncached_klass_ref_index_at(index2);
bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
if (match) {
recur1 = uncached_name_and_type_ref_index_at(index1);
recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
if (match) {
return true;
}
}
} break;
case JVM_CONSTANT_Float:
{
jfloat f1 = float_at(index1);
jfloat f2 = cp2->float_at(index2);
if (f1 == f2) {
return true;
}
} break;
case JVM_CONSTANT_Integer:
{
jint i1 = int_at(index1);
jint i2 = cp2->int_at(index2);
if (i1 == i2) {
return true;
}
} break;
case JVM_CONSTANT_Long:
{
jlong l1 = long_at(index1);
jlong l2 = cp2->long_at(index2);
if (l1 == l2) {
return true;
}
} break;
case JVM_CONSTANT_NameAndType:
{
int recur1 = name_ref_index_at(index1);
int recur2 = cp2->name_ref_index_at(index2);
bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
if (match) {
recur1 = signature_ref_index_at(index1);
recur2 = cp2->signature_ref_index_at(index2);
match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
if (match) {
return true;
}
}
} break;
case JVM_CONSTANT_String:
{
oop s1 = string_at(index1, CHECK_false);
oop s2 = cp2->string_at(index2, CHECK_false);
if (s1 == s2) {
return true;
}
} break;
case JVM_CONSTANT_StringIndex:
{
int recur1 = string_index_at(index1);
int recur2 = cp2->string_index_at(index2);
bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
if (match) {
return true;
}
} break;
case JVM_CONSTANT_UnresolvedClass:
{
symbolOop k1 = unresolved_klass_at(index1);
symbolOop k2 = cp2->unresolved_klass_at(index2);
if (k1 == k2) {
return true;
}
} break;
case JVM_CONSTANT_UnresolvedString:
{
symbolOop s1 = unresolved_string_at(index1);
symbolOop s2 = cp2->unresolved_string_at(index2);
if (s1 == s2) {
return true;
}
} break;
case JVM_CONSTANT_Utf8:
{
symbolOop s1 = symbol_at(index1);
symbolOop s2 = cp2->symbol_at(index2);
if (s1 == s2) {
return true;
}
} break;
// Invalid is used as the tag for the second constant pool entry
// occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
// not be seen by itself.
case JVM_CONSTANT_Invalid: // fall through
default:
ShouldNotReachHere();
break;
}
return false;
} // end compare_entry_to()
// Copy this constant pool's entries at start_i to end_i (inclusive)
// to the constant pool to_cp's entries starting at to_i. A total of
// (end_i - start_i) + 1 entries are copied.
void constantPoolOopDesc::copy_cp_to(int start_i, int end_i,
constantPoolHandle to_cp, int to_i, TRAPS) {
int dest_i = to_i; // leave original alone for debug purposes
for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
copy_entry_to(src_i, to_cp, dest_i, CHECK);
switch (tag_at(src_i).value()) {
case JVM_CONSTANT_Double:
case JVM_CONSTANT_Long:
// double and long take two constant pool entries
src_i += 2;
dest_i += 2;
break;
default:
// all others take one constant pool entry
src_i++;
dest_i++;
break;
}
}
} // end copy_cp_to()
// Copy this constant pool's entry at from_i to the constant pool
// to_cp's entry at to_i.
void constantPoolOopDesc::copy_entry_to(int from_i, constantPoolHandle to_cp,
int to_i, TRAPS) {
switch (tag_at(from_i).value()) {
case JVM_CONSTANT_Class:
{
klassOop k = klass_at(from_i, CHECK);
to_cp->klass_at_put(to_i, k);
} break;
case JVM_CONSTANT_ClassIndex:
{
jint ki = klass_index_at(from_i);
to_cp->klass_index_at_put(to_i, ki);
} break;
case JVM_CONSTANT_Double:
{
jdouble d = double_at(from_i);
to_cp->double_at_put(to_i, d);
// double takes two constant pool entries so init second entry's tag
to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
} break;
case JVM_CONSTANT_Fieldref:
{
int class_index = uncached_klass_ref_index_at(from_i);
int name_and_type_index = uncached_name_and_type_ref_index_at(from_i);
to_cp->field_at_put(to_i, class_index, name_and_type_index);
} break;
case JVM_CONSTANT_Float:
{
jfloat f = float_at(from_i);
to_cp->float_at_put(to_i, f);
} break;
case JVM_CONSTANT_Integer:
{
jint i = int_at(from_i);
to_cp->int_at_put(to_i, i);
} break;
case JVM_CONSTANT_InterfaceMethodref:
{
int class_index = uncached_klass_ref_index_at(from_i);
int name_and_type_index = uncached_name_and_type_ref_index_at(from_i);
to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
} break;
case JVM_CONSTANT_Long:
{
jlong l = long_at(from_i);
to_cp->long_at_put(to_i, l);
// long takes two constant pool entries so init second entry's tag
to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
} break;
case JVM_CONSTANT_Methodref:
{
int class_index = uncached_klass_ref_index_at(from_i);
int name_and_type_index = uncached_name_and_type_ref_index_at(from_i);
to_cp->method_at_put(to_i, class_index, name_and_type_index);
} break;
case JVM_CONSTANT_NameAndType:
{
int name_ref_index = name_ref_index_at(from_i);
int signature_ref_index = signature_ref_index_at(from_i);
to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
} break;
case JVM_CONSTANT_String:
{
oop s = string_at(from_i, CHECK);
to_cp->string_at_put(to_i, s);
} break;
case JVM_CONSTANT_StringIndex:
{
jint si = string_index_at(from_i);
to_cp->string_index_at_put(to_i, si);
} break;
case JVM_CONSTANT_UnresolvedClass:
{
symbolOop k = unresolved_klass_at(from_i);
to_cp->unresolved_klass_at_put(to_i, k);
} break;
case JVM_CONSTANT_UnresolvedClassInError:
{
symbolOop k = unresolved_klass_at(from_i);
to_cp->unresolved_klass_at_put(to_i, k);
to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError);
} break;
case JVM_CONSTANT_UnresolvedString:
{
symbolOop s = unresolved_string_at(from_i);
to_cp->unresolved_string_at_put(to_i, s);
} break;
case JVM_CONSTANT_Utf8:
{
symbolOop s = symbol_at(from_i);
to_cp->symbol_at_put(to_i, s);
} break;
// Invalid is used as the tag for the second constant pool entry
// occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
// not be seen by itself.
case JVM_CONSTANT_Invalid: // fall through
default:
{
jbyte bad_value = tag_at(from_i).value(); // leave a breadcrumb
ShouldNotReachHere();
} break;
}
} // end copy_entry_to()
// Search constant pool search_cp for an entry that matches this
// constant pool's entry at pattern_i. Returns the index of a
// matching entry or zero (0) if there is no matching entry.
int constantPoolOopDesc::find_matching_entry(int pattern_i,
constantPoolHandle search_cp, TRAPS) {
// index zero (0) is not used
for (int i = 1; i < search_cp->length(); i++) {
bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
if (found) {
return i;
}
}
return 0; // entry not found; return unused index zero (0)
} // end find_matching_entry()
#ifndef PRODUCT
const char* constantPoolOopDesc::printable_name_at(int which) {
constantTag tag = tag_at(which);
if (tag.is_unresolved_string() || tag.is_string()) {
return string_at_noresolve(which);
} else if (tag.is_klass() || tag.is_unresolved_klass()) {
return klass_name_at(which)->as_C_string();
} else if (tag.is_symbol()) {
return symbol_at(which)->as_C_string();
}
return "";
}
#endif // PRODUCT
// JVMTI GetConstantPool support
// For temporary use until code is stable.
#define DBG(code)
static const char* WARN_MSG = "Must not be such entry!";
static void print_cpool_bytes(jint cnt, u1 *bytes) {
jint size = 0;
u2 idx1, idx2;
for (jint idx = 1; idx < cnt; idx++) {
jint ent_size = 0;
u1 tag = *bytes++;
size++; // count tag
printf("const #%03d, tag: %02d ", idx, tag);
switch(tag) {
case JVM_CONSTANT_Invalid: {
printf("Invalid");
break;
}
case JVM_CONSTANT_Unicode: {
printf("Unicode %s", WARN_MSG);
break;
}
case JVM_CONSTANT_Utf8: {
u2 len = Bytes::get_Java_u2(bytes);
char str[128];
if (len > 127) {
len = 127;
}
strncpy(str, (char *) (bytes+2), len);
str[len] = '\0';
printf("Utf8 \"%s\"", str);
ent_size = 2 + len;
break;
}
case JVM_CONSTANT_Integer: {
u4 val = Bytes::get_Java_u4(bytes);
printf("int %d", *(int *) &val);
ent_size = 4;
break;
}
case JVM_CONSTANT_Float: {
u4 val = Bytes::get_Java_u4(bytes);
printf("float %5.3ff", *(float *) &val);
ent_size = 4;
break;
}
case JVM_CONSTANT_Long: {
u8 val = Bytes::get_Java_u8(bytes);
printf("long "INT64_FORMAT, *(jlong *) &val);
ent_size = 8;
idx++; // Long takes two cpool slots
break;
}
case JVM_CONSTANT_Double: {
u8 val = Bytes::get_Java_u8(bytes);
printf("double %5.3fd", *(jdouble *)&val);
ent_size = 8;
idx++; // Double takes two cpool slots
break;
}
case JVM_CONSTANT_Class: {
idx1 = Bytes::get_Java_u2(bytes);
printf("class #%03d", idx1);
ent_size = 2;
break;
}
case JVM_CONSTANT_String: {
idx1 = Bytes::get_Java_u2(bytes);
printf("String #%03d", idx1);
ent_size = 2;
break;
}
case JVM_CONSTANT_Fieldref: {
idx1 = Bytes::get_Java_u2(bytes);
idx2 = Bytes::get_Java_u2(bytes+2);
printf("Field #%03d, #%03d", (int) idx1, (int) idx2);
ent_size = 4;
break;
}
case JVM_CONSTANT_Methodref: {
idx1 = Bytes::get_Java_u2(bytes);
idx2 = Bytes::get_Java_u2(bytes+2);
printf("Method #%03d, #%03d", idx1, idx2);
ent_size = 4;
break;
}
case JVM_CONSTANT_InterfaceMethodref: {
idx1 = Bytes::get_Java_u2(bytes);
idx2 = Bytes::get_Java_u2(bytes+2);
printf("InterfMethod #%03d, #%03d", idx1, idx2);
ent_size = 4;
break;
}
case JVM_CONSTANT_NameAndType: {
idx1 = Bytes::get_Java_u2(bytes);
idx2 = Bytes::get_Java_u2(bytes+2);
printf("NameAndType #%03d, #%03d", idx1, idx2);
ent_size = 4;
break;
}
case JVM_CONSTANT_ClassIndex: {
printf("ClassIndex %s", WARN_MSG);
break;
}
case JVM_CONSTANT_UnresolvedClass: {
printf("UnresolvedClass: %s", WARN_MSG);
break;
}
case JVM_CONSTANT_UnresolvedClassInError: {
printf("UnresolvedClassInErr: %s", WARN_MSG);
break;
}
case JVM_CONSTANT_StringIndex: {
printf("StringIndex: %s", WARN_MSG);
break;
}
case JVM_CONSTANT_UnresolvedString: {
printf("UnresolvedString: %s", WARN_MSG);
break;
}
}
printf(";\n");
bytes += ent_size;
size += ent_size;
}
printf("Cpool size: %d\n", size);
fflush(0);
return;
} /* end print_cpool_bytes */
// Returns size of constant pool entry.
jint constantPoolOopDesc::cpool_entry_size(jint idx) {
switch(tag_at(idx).value()) {
case JVM_CONSTANT_Invalid:
case JVM_CONSTANT_Unicode:
return 1;
case JVM_CONSTANT_Utf8:
return 3 + symbol_at(idx)->utf8_length();
case JVM_CONSTANT_Class:
case JVM_CONSTANT_String:
case JVM_CONSTANT_ClassIndex:
case JVM_CONSTANT_UnresolvedClass:
case JVM_CONSTANT_UnresolvedClassInError:
case JVM_CONSTANT_StringIndex:
case JVM_CONSTANT_UnresolvedString:
return 3;
case JVM_CONSTANT_Integer:
case JVM_CONSTANT_Float:
case JVM_CONSTANT_Fieldref:
case JVM_CONSTANT_Methodref:
case JVM_CONSTANT_InterfaceMethodref:
case JVM_CONSTANT_NameAndType:
return 5;
case JVM_CONSTANT_Long:
case JVM_CONSTANT_Double:
return 9;
}
assert(false, "cpool_entry_size: Invalid constant pool entry tag");
return 1;
} /* end cpool_entry_size */
// SymbolHashMap is used to find a constant pool index from a string.
// This function fills in SymbolHashMaps, one for utf8s and one for
// class names, returns size of the cpool raw bytes.
jint constantPoolOopDesc::hash_entries_to(SymbolHashMap *symmap,
SymbolHashMap *classmap) {
jint size = 0;
for (u2 idx = 1; idx < length(); idx++) {
u2 tag = tag_at(idx).value();
size += cpool_entry_size(idx);
switch(tag) {
case JVM_CONSTANT_Utf8: {
symbolOop sym = symbol_at(idx);
symmap->add_entry(sym, idx);
DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
break;
}
case JVM_CONSTANT_Class:
case JVM_CONSTANT_UnresolvedClass:
case JVM_CONSTANT_UnresolvedClassInError: {
symbolOop sym = klass_name_at(idx);
classmap->add_entry(sym, idx);
DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
break;
}
case JVM_CONSTANT_Long:
case JVM_CONSTANT_Double: {
idx++; // Both Long and Double take two cpool slots
break;
}
}
}
return size;
} /* end hash_utf8_entries_to */
// Copy cpool bytes.
// Returns:
// 0, in case of OutOfMemoryError
// -1, in case of internal error
// > 0, count of the raw cpool bytes that have been copied
int constantPoolOopDesc::copy_cpool_bytes(int cpool_size,
SymbolHashMap* tbl,
unsigned char *bytes) {
u2 idx1, idx2;
jint size = 0;
jint cnt = length();
unsigned char *start_bytes = bytes;
for (jint idx = 1; idx < cnt; idx++) {
u1 tag = tag_at(idx).value();
jint ent_size = cpool_entry_size(idx);
assert(size + ent_size <= cpool_size, "Size mismatch");
*bytes = tag;
DBG(printf("#%03hd tag=%03hd, ", idx, tag));
switch(tag) {
case JVM_CONSTANT_Invalid: {
DBG(printf("JVM_CONSTANT_Invalid"));
break;
}
case JVM_CONSTANT_Unicode: {
assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
DBG(printf("JVM_CONSTANT_Unicode"));
break;
}
case JVM_CONSTANT_Utf8: {
symbolOop sym = symbol_at(idx);
char* str = sym->as_utf8();
// Warning! It's crashing on x86 with len = sym->utf8_length()
int len = (int) strlen(str);
Bytes::put_Java_u2((address) (bytes+1), (u2) len);
for (int i = 0; i < len; i++) {
bytes[3+i] = (u1) str[i];
}
DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
break;
}
case JVM_CONSTANT_Integer: {
jint val = int_at(idx);
Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
break;
}
case JVM_CONSTANT_Float: {
jfloat val = float_at(idx);
Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
break;
}
case JVM_CONSTANT_Long: {
jlong val = long_at(idx);
Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
idx++; // Long takes two cpool slots
break;
}
case JVM_CONSTANT_Double: {
jdouble val = double_at(idx);
Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
idx++; // Double takes two cpool slots
break;
}
case JVM_CONSTANT_Class:
case JVM_CONSTANT_UnresolvedClass:
case JVM_CONSTANT_UnresolvedClassInError: {
*bytes = JVM_CONSTANT_Class;
symbolOop sym = klass_name_at(idx);
idx1 = tbl->symbol_to_value(sym);
assert(idx1 != 0, "Have not found a hashtable entry");
Bytes::put_Java_u2((address) (bytes+1), idx1);
DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
break;
}
case JVM_CONSTANT_String: {
unsigned int hash;
char *str = string_at_noresolve(idx);
symbolOop sym = SymbolTable::lookup_only(str, (int) strlen(str), hash);
idx1 = tbl->symbol_to_value(sym);
assert(idx1 != 0, "Have not found a hashtable entry");
Bytes::put_Java_u2((address) (bytes+1), idx1);
DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, str));
break;
}
case JVM_CONSTANT_UnresolvedString: {
*bytes = JVM_CONSTANT_String;
symbolOop sym = unresolved_string_at(idx);
idx1 = tbl->symbol_to_value(sym);
assert(idx1 != 0, "Have not found a hashtable entry");
Bytes::put_Java_u2((address) (bytes+1), idx1);
DBG(char *str = sym->as_utf8());
DBG(printf("JVM_CONSTANT_UnresolvedString: idx=#%03hd, %s", idx1, str));
break;
}
case JVM_CONSTANT_Fieldref:
case JVM_CONSTANT_Methodref:
case JVM_CONSTANT_InterfaceMethodref: {
idx1 = uncached_klass_ref_index_at(idx);
idx2 = uncached_name_and_type_ref_index_at(idx);
Bytes::put_Java_u2((address) (bytes+1), idx1);
Bytes::put_Java_u2((address) (bytes+3), idx2);
DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
break;
}
case JVM_CONSTANT_NameAndType: {
idx1 = name_ref_index_at(idx);
idx2 = signature_ref_index_at(idx);
Bytes::put_Java_u2((address) (bytes+1), idx1);
Bytes::put_Java_u2((address) (bytes+3), idx2);
DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
break;
}
case JVM_CONSTANT_ClassIndex: {
*bytes = JVM_CONSTANT_Class;
idx1 = klass_index_at(idx);
Bytes::put_Java_u2((address) (bytes+1), idx1);
DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
break;
}
case JVM_CONSTANT_StringIndex: {
*bytes = JVM_CONSTANT_String;
idx1 = string_index_at(idx);
Bytes::put_Java_u2((address) (bytes+1), idx1);
DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
break;
}
}
DBG(printf("\n"));
bytes += ent_size;
size += ent_size;
}
assert(size == cpool_size, "Size mismatch");
// Keep temorarily for debugging until it's stable.
DBG(print_cpool_bytes(cnt, start_bytes));
return (int)(bytes - start_bytes);
} /* end copy_cpool_bytes */
void SymbolHashMap::add_entry(symbolOop sym, u2 value) {
char *str = sym->as_utf8();
unsigned int hash = compute_hash(str, sym->utf8_length());
unsigned int index = hash % table_size();
// check if already in map
// we prefer the first entry since it is more likely to be what was used in
// the class file
for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
if (en->hash() == hash && en->symbol() == sym) {
return; // already there
}
}
SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
entry->set_next(bucket(index));
_buckets[index].set_entry(entry);
assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
}
SymbolHashMapEntry* SymbolHashMap::find_entry(symbolOop sym) {
assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
char *str = sym->as_utf8();
int len = sym->utf8_length();
unsigned int hash = SymbolHashMap::compute_hash(str, len);
unsigned int index = hash % table_size();
for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
if (en->hash() == hash && en->symbol() == sym) {
return en;
}
}
return NULL;
}