| /* |
| * 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::impl_name_ref_at(int which, bool uncached) { |
| int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); |
| return symbol_at(name_index); |
| } |
| |
| |
| symbolOop constantPoolOopDesc::impl_signature_ref_at(int which, bool uncached) { |
| int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached)); |
| return symbol_at(signature_index); |
| } |
| |
| |
| int constantPoolOopDesc::impl_name_and_type_ref_index_at(int which, bool uncached) { |
| jint ref_index = field_or_method_at(which, uncached); |
| return extract_high_short_from_int(ref_index); |
| } |
| |
| |
| int constantPoolOopDesc::impl_klass_ref_index_at(int which, bool uncached) { |
| jint ref_index = field_or_method_at(which, uncached); |
| return extract_low_short_from_int(ref_index); |
| } |
| |
| |
| |
| int constantPoolOopDesc::map_instruction_operand_to_index(int operand) { |
| if (constantPoolCacheOopDesc::is_secondary_index(operand)) { |
| return cache()->main_entry_at(operand)->constant_pool_index(); |
| } |
| assert((int)(u2)operand == operand, "clean u2"); |
| int index = Bytes::swap_u2(operand); |
| return cache()->entry_at(index)->constant_pool_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::name_ref_index_at(int which_nt) { |
| jint ref_index = name_and_type_at(which_nt); |
| return extract_low_short_from_int(ref_index); |
| } |
| |
| |
| int constantPoolOopDesc::signature_ref_index_at(int which_nt) { |
| jint ref_index = name_and_type_at(which_nt); |
| 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>"; |
| } |
| } |
| |
| |
| 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; |
| } |