| /* |
| * 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/classLoaderData.hpp" |
| #include "classfile/javaClasses.inline.hpp" |
| #include "classfile/metadataOnStackMark.hpp" |
| #include "classfile/stringTable.hpp" |
| #include "classfile/systemDictionary.hpp" |
| #include "classfile/vmSymbols.hpp" |
| #include "interpreter/linkResolver.hpp" |
| #include "memory/heapInspection.hpp" |
| #include "memory/metadataFactory.hpp" |
| #include "memory/oopFactory.hpp" |
| #include "oops/constantPool.hpp" |
| #include "oops/instanceKlass.hpp" |
| #include "oops/objArrayKlass.hpp" |
| #include "oops/objArrayOop.inline.hpp" |
| #include "oops/oop.inline.hpp" |
| #include "runtime/fieldType.hpp" |
| #include "runtime/init.hpp" |
| #include "runtime/javaCalls.hpp" |
| #include "runtime/signature.hpp" |
| #include "runtime/vframe.hpp" |
| #include "utilities/copy.hpp" |
| |
| ConstantPool* ConstantPool::allocate(ClassLoaderData* loader_data, int length, TRAPS) { |
| // Tags are RW but comment below applies to tags also. |
| Array<u1>* tags = MetadataFactory::new_writeable_array<u1>(loader_data, length, 0, CHECK_NULL); |
| |
| int size = ConstantPool::size(length); |
| |
| // CDS considerations: |
| // Allocate read-write but may be able to move to read-only at dumping time |
| // if all the klasses are resolved. The only other field that is writable is |
| // the resolved_references array, which is recreated at startup time. |
| // But that could be moved to InstanceKlass (although a pain to access from |
| // assembly code). Maybe it could be moved to the cpCache which is RW. |
| return new (loader_data, size, false, MetaspaceObj::ConstantPoolType, THREAD) ConstantPool(tags); |
| } |
| |
| #ifdef ASSERT |
| |
| // MetaspaceObj allocation invariant is calloc equivalent memory |
| // simple verification of this here (JVM_CONSTANT_Invalid == 0 ) |
| static bool tag_array_is_zero_initialized(Array<u1>* tags) { |
| assert(tags != NULL, "invariant"); |
| const int length = tags->length(); |
| for (int index = 0; index < length; ++index) { |
| if (JVM_CONSTANT_Invalid != tags->at(index)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| #endif |
| |
| ConstantPool::ConstantPool(Array<u1>* tags) : |
| _tags(tags), |
| _length(tags->length()) { |
| |
| assert(_tags != NULL, "invariant"); |
| assert(tags->length() == _length, "invariant"); |
| assert(tag_array_is_zero_initialized(tags), "invariant"); |
| assert(0 == _flags, "invariant"); |
| assert(0 == version(), "invariant"); |
| assert(NULL == _pool_holder, "invariant"); |
| } |
| |
| void ConstantPool::deallocate_contents(ClassLoaderData* loader_data) { |
| MetadataFactory::free_metadata(loader_data, cache()); |
| set_cache(NULL); |
| MetadataFactory::free_array<u2>(loader_data, reference_map()); |
| set_reference_map(NULL); |
| |
| MetadataFactory::free_array<jushort>(loader_data, operands()); |
| set_operands(NULL); |
| |
| release_C_heap_structures(); |
| |
| // free tag array |
| MetadataFactory::free_array<u1>(loader_data, tags()); |
| set_tags(NULL); |
| } |
| |
| void ConstantPool::release_C_heap_structures() { |
| // walk constant pool and decrement symbol reference counts |
| unreference_symbols(); |
| } |
| |
| objArrayOop ConstantPool::resolved_references() const { |
| return (objArrayOop)JNIHandles::resolve(_resolved_references); |
| } |
| |
| // Create resolved_references array and mapping array for original cp indexes |
| // The ldc bytecode was rewritten to have the resolved reference array index so need a way |
| // to map it back for resolving and some unlikely miscellaneous uses. |
| // The objects created by invokedynamic are appended to this list. |
| void ConstantPool::initialize_resolved_references(ClassLoaderData* loader_data, |
| const intStack& reference_map, |
| int constant_pool_map_length, |
| TRAPS) { |
| // Initialized the resolved object cache. |
| int map_length = reference_map.length(); |
| if (map_length > 0) { |
| // Only need mapping back to constant pool entries. The map isn't used for |
| // invokedynamic resolved_reference entries. For invokedynamic entries, |
| // the constant pool cache index has the mapping back to both the constant |
| // pool and to the resolved reference index. |
| if (constant_pool_map_length > 0) { |
| Array<u2>* om = MetadataFactory::new_array<u2>(loader_data, constant_pool_map_length, CHECK); |
| |
| for (int i = 0; i < constant_pool_map_length; i++) { |
| int x = reference_map.at(i); |
| assert(x == (int)(jushort) x, "klass index is too big"); |
| om->at_put(i, (jushort)x); |
| } |
| set_reference_map(om); |
| } |
| |
| // Create Java array for holding resolved strings, methodHandles, |
| // methodTypes, invokedynamic and invokehandle appendix objects, etc. |
| objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); |
| Handle refs_handle (THREAD, (oop)stom); // must handleize. |
| set_resolved_references(loader_data->add_handle(refs_handle)); |
| } |
| } |
| |
| // CDS support. Create a new resolved_references array. |
| void ConstantPool::restore_unshareable_info(TRAPS) { |
| |
| // Only create the new resolved references array if it hasn't been attempted before |
| if (resolved_references() != NULL) return; |
| |
| // restore the C++ vtable from the shared archive |
| restore_vtable(); |
| |
| if (SystemDictionary::Object_klass_loaded()) { |
| // Recreate the object array and add to ClassLoaderData. |
| int map_length = resolved_reference_length(); |
| if (map_length > 0) { |
| objArrayOop stom = oopFactory::new_objArray(SystemDictionary::Object_klass(), map_length, CHECK); |
| Handle refs_handle (THREAD, (oop)stom); // must handleize. |
| |
| ClassLoaderData* loader_data = pool_holder()->class_loader_data(); |
| set_resolved_references(loader_data->add_handle(refs_handle)); |
| } |
| } |
| } |
| |
| void ConstantPool::remove_unshareable_info() { |
| // Resolved references are not in the shared archive. |
| // Save the length for restoration. It is not necessarily the same length |
| // as reference_map.length() if invokedynamic is saved. |
| set_resolved_reference_length( |
| resolved_references() != NULL ? resolved_references()->length() : 0); |
| set_resolved_references(NULL); |
| } |
| |
| int ConstantPool::cp_to_object_index(int cp_index) { |
| // this is harder don't do this so much. |
| int i = reference_map()->find(cp_index); |
| // We might not find the index for jsr292 call. |
| return (i < 0) ? _no_index_sentinel : i; |
| } |
| |
| void ConstantPool::string_at_put(int which, int obj_index, oop str) { |
| resolved_references()->obj_at_put(obj_index, str); |
| } |
| |
| void ConstantPool::trace_class_resolution(const constantPoolHandle& this_cp, KlassHandle k) { |
| 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()); |
| Symbol* s = vfst.method()->method_holder()->source_file_name(); |
| if (s != NULL) { |
| source_file = s->as_C_string(); |
| } |
| } |
| } |
| if (k() != this_cp->pool_holder()) { |
| // only print something if the classes are different |
| if (source_file != NULL) { |
| log_info(classresolve)("%s %s %s:%d", |
| this_cp->pool_holder()->external_name(), |
| k->external_name(), source_file, line_number); |
| } else { |
| log_info(classresolve)("%s %s", |
| this_cp->pool_holder()->external_name(), |
| k->external_name()); |
| } |
| } |
| } |
| |
| Klass* ConstantPool::klass_at_impl(const constantPoolHandle& this_cp, int which, |
| bool save_resolution_error, TRAPS) { |
| assert(THREAD->is_Java_thread(), "must be a Java thread"); |
| |
| // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. |
| // 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. |
| CPSlot entry = this_cp->slot_at(which); |
| if (entry.is_resolved()) { |
| assert(entry.get_klass()->is_klass(), "must be"); |
| // Already resolved - return entry. |
| return entry.get_klass(); |
| } |
| |
| // This tag doesn't change back to unresolved class unless at a safepoint. |
| if (this_cp->tag_at(which).is_unresolved_klass_in_error()) { |
| // The original attempt to resolve this constant pool entry failed so find the |
| // class of the original error and throw another error of the same class |
| // (JVMS 5.4.3). |
| // If there is a detail message, pass that detail message to the error. |
| // The JVMS does not strictly require us to duplicate the same detail message, |
| // or any internal exception fields such as cause or stacktrace. But since the |
| // detail message is often a class name or other literal string, we will repeat it |
| // if we can find it in the symbol table. |
| throw_resolution_error(this_cp, which, CHECK_0); |
| ShouldNotReachHere(); |
| } |
| |
| Handle mirror_handle; |
| Symbol* name = entry.get_symbol(); |
| Handle loader (THREAD, this_cp->pool_holder()->class_loader()); |
| Handle protection_domain (THREAD, this_cp->pool_holder()->protection_domain()); |
| Klass* kk = SystemDictionary::resolve_or_fail(name, loader, protection_domain, true, THREAD); |
| KlassHandle k (THREAD, kk); |
| if (!HAS_PENDING_EXCEPTION) { |
| // preserve the resolved klass from unloading |
| mirror_handle = Handle(THREAD, kk->java_mirror()); |
| // Do access check for klasses |
| verify_constant_pool_resolve(this_cp, 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) { |
| if (save_resolution_error) { |
| save_and_throw_exception(this_cp, which, constantTag(JVM_CONSTANT_UnresolvedClass), CHECK_NULL); |
| // If CHECK_NULL above doesn't return the exception, that means that |
| // some other thread has beaten us and has resolved the class. |
| // To preserve old behavior, we return the resolved class. |
| entry = this_cp->resolved_klass_at(which); |
| assert(entry.is_resolved(), "must be resolved if exception was cleared"); |
| assert(entry.get_klass()->is_klass(), "must be resolved to a klass"); |
| return entry.get_klass(); |
| } else { |
| return NULL; // return the pending exception |
| } |
| } |
| |
| // Make this class loader depend upon the class loader owning the class reference |
| ClassLoaderData* this_key = this_cp->pool_holder()->class_loader_data(); |
| this_key->record_dependency(k(), CHECK_NULL); // Can throw OOM |
| |
| if (log_is_enabled(Info, classresolve) && !k->is_array_klass()) { |
| // skip resolving the constant pool so that this code gets |
| // called the next time some bytecodes refer to this class. |
| trace_class_resolution(this_cp, k); |
| return k(); |
| } else { |
| this_cp->klass_at_put(which, k()); |
| } |
| |
| entry = this_cp->resolved_klass_at(which); |
| assert(entry.is_resolved() && entry.get_klass()->is_klass(), "must be resolved at this point"); |
| return entry.get_klass(); |
| } |
| |
| |
| // Does not update ConstantPool* - 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 |
| Klass* ConstantPool::klass_at_if_loaded(const constantPoolHandle& this_cp, int which) { |
| CPSlot entry = this_cp->slot_at(which); |
| if (entry.is_resolved()) { |
| assert(entry.get_klass()->is_klass(), "must be"); |
| return entry.get_klass(); |
| } else { |
| assert(entry.is_unresolved(), "must be either symbol or klass"); |
| Thread *thread = Thread::current(); |
| Symbol* name = entry.get_symbol(); |
| oop loader = this_cp->pool_holder()->class_loader(); |
| oop protection_domain = this_cp->pool_holder()->protection_domain(); |
| Handle h_prot (thread, protection_domain); |
| Handle h_loader (thread, loader); |
| Klass* 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_cp, klass, THREAD); |
| if (HAS_PENDING_EXCEPTION) { |
| CLEAR_PENDING_EXCEPTION; |
| return NULL; |
| } |
| return klass(); |
| } else { |
| return k; |
| } |
| } |
| } |
| |
| |
| Klass* ConstantPool::klass_ref_at_if_loaded(const constantPoolHandle& this_cp, int which) { |
| return klass_at_if_loaded(this_cp, this_cp->klass_ref_index_at(which)); |
| } |
| |
| |
| Method* ConstantPool::method_at_if_loaded(const constantPoolHandle& cpool, |
| int which) { |
| if (cpool->cache() == NULL) return NULL; // nothing to load yet |
| int cache_index = decode_cpcache_index(which, true); |
| if (!(cache_index >= 0 && cache_index < cpool->cache()->length())) { |
| // FIXME: should be an assert |
| if (PrintMiscellaneous && (Verbose||WizardMode)) { |
| tty->print_cr("bad operand %d in:", which); cpool->print(); |
| } |
| return NULL; |
| } |
| ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
| return e->method_if_resolved(cpool); |
| } |
| |
| |
| bool ConstantPool::has_appendix_at_if_loaded(const constantPoolHandle& cpool, int which) { |
| if (cpool->cache() == NULL) return false; // nothing to load yet |
| int cache_index = decode_cpcache_index(which, true); |
| ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
| return e->has_appendix(); |
| } |
| |
| oop ConstantPool::appendix_at_if_loaded(const constantPoolHandle& cpool, int which) { |
| if (cpool->cache() == NULL) return NULL; // nothing to load yet |
| int cache_index = decode_cpcache_index(which, true); |
| ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
| return e->appendix_if_resolved(cpool); |
| } |
| |
| |
| bool ConstantPool::has_method_type_at_if_loaded(const constantPoolHandle& cpool, int which) { |
| if (cpool->cache() == NULL) return false; // nothing to load yet |
| int cache_index = decode_cpcache_index(which, true); |
| ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
| return e->has_method_type(); |
| } |
| |
| oop ConstantPool::method_type_at_if_loaded(const constantPoolHandle& cpool, int which) { |
| if (cpool->cache() == NULL) return NULL; // nothing to load yet |
| int cache_index = decode_cpcache_index(which, true); |
| ConstantPoolCacheEntry* e = cpool->cache()->entry_at(cache_index); |
| return e->method_type_if_resolved(cpool); |
| } |
| |
| |
| Symbol* ConstantPool::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); |
| } |
| |
| |
| Symbol* ConstantPool::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 ConstantPool::impl_name_and_type_ref_index_at(int which, bool uncached) { |
| int i = which; |
| if (!uncached && cache() != NULL) { |
| if (ConstantPool::is_invokedynamic_index(which)) { |
| // Invokedynamic index is index into resolved_references |
| int pool_index = invokedynamic_cp_cache_entry_at(which)->constant_pool_index(); |
| pool_index = invoke_dynamic_name_and_type_ref_index_at(pool_index); |
| assert(tag_at(pool_index).is_name_and_type(), ""); |
| return pool_index; |
| } |
| // change byte-ordering and go via cache |
| i = remap_instruction_operand_from_cache(which); |
| } else { |
| if (tag_at(which).is_invoke_dynamic()) { |
| int pool_index = invoke_dynamic_name_and_type_ref_index_at(which); |
| assert(tag_at(pool_index).is_name_and_type(), ""); |
| return pool_index; |
| } |
| } |
| assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); |
| assert(!tag_at(i).is_invoke_dynamic(), "Must be handled above"); |
| jint ref_index = *int_at_addr(i); |
| return extract_high_short_from_int(ref_index); |
| } |
| |
| |
| int ConstantPool::impl_klass_ref_index_at(int which, bool uncached) { |
| guarantee(!ConstantPool::is_invokedynamic_index(which), |
| "an invokedynamic instruction does not have a klass"); |
| int i = which; |
| if (!uncached && cache() != NULL) { |
| // change byte-ordering and go via cache |
| i = remap_instruction_operand_from_cache(which); |
| } |
| assert(tag_at(i).is_field_or_method(), "Corrupted constant pool"); |
| jint ref_index = *int_at_addr(i); |
| return extract_low_short_from_int(ref_index); |
| } |
| |
| |
| |
| int ConstantPool::remap_instruction_operand_from_cache(int operand) { |
| int cpc_index = operand; |
| DEBUG_ONLY(cpc_index -= CPCACHE_INDEX_TAG); |
| assert((int)(u2)cpc_index == cpc_index, "clean u2"); |
| int member_index = cache()->entry_at(cpc_index)->constant_pool_index(); |
| return member_index; |
| } |
| |
| |
| void ConstantPool::verify_constant_pool_resolve(const constantPoolHandle& this_cp, KlassHandle k, TRAPS) { |
| if (k->is_instance_klass() || k->is_objArray_klass()) { |
| instanceKlassHandle holder (THREAD, this_cp->pool_holder()); |
| Klass* elem = k->is_instance_klass() ? k() : ObjArrayKlass::cast(k())->bottom_klass(); |
| KlassHandle element (THREAD, elem); |
| |
| // The element type could be a typeArray - we only need the access check if it is |
| // an reference to another class |
| if (element->is_instance_klass()) { |
| LinkResolver::check_klass_accessability(holder, element, CHECK); |
| } |
| } |
| } |
| |
| |
| int ConstantPool::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 ConstantPool::signature_ref_index_at(int which_nt) { |
| jint ref_index = name_and_type_at(which_nt); |
| return extract_high_short_from_int(ref_index); |
| } |
| |
| |
| Klass* ConstantPool::klass_ref_at(int which, TRAPS) { |
| return klass_at(klass_ref_index_at(which), THREAD); |
| } |
| |
| |
| Symbol* ConstantPool::klass_name_at(int which) const { |
| assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(), |
| "Corrupted constant pool"); |
| // A resolved constantPool entry will contain a Klass*, otherwise a Symbol*. |
| // 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. |
| CPSlot entry = slot_at(which); |
| if (entry.is_resolved()) { |
| // Already resolved - return entry's name. |
| assert(entry.get_klass()->is_klass(), "must be"); |
| return entry.get_klass()->name(); |
| } else { |
| assert(entry.is_unresolved(), "must be either symbol or klass"); |
| return entry.get_symbol(); |
| } |
| } |
| |
| Symbol* ConstantPool::klass_ref_at_noresolve(int which) { |
| jint ref_index = klass_ref_index_at(which); |
| return klass_at_noresolve(ref_index); |
| } |
| |
| Symbol* ConstantPool::uncached_klass_ref_at_noresolve(int which) { |
| jint ref_index = uncached_klass_ref_index_at(which); |
| return klass_at_noresolve(ref_index); |
| } |
| |
| char* ConstantPool::string_at_noresolve(int which) { |
| return unresolved_string_at(which)->as_C_string(); |
| } |
| |
| BasicType ConstantPool::basic_type_for_signature_at(int which) const { |
| return FieldType::basic_type(symbol_at(which)); |
| } |
| |
| |
| void ConstantPool::resolve_string_constants_impl(const constantPoolHandle& this_cp, TRAPS) { |
| for (int index = 1; index < this_cp->length(); index++) { // Index 0 is unused |
| if (this_cp->tag_at(index).is_string()) { |
| this_cp->string_at(index, CHECK); |
| } |
| } |
| } |
| |
| // Resolve all the classes in the constant pool. If they are all resolved, |
| // the constant pool is read-only. Enhancement: allocate cp entries to |
| // another metaspace, and copy to read-only or read-write space if this |
| // bit is set. |
| bool ConstantPool::resolve_class_constants(TRAPS) { |
| constantPoolHandle cp(THREAD, this); |
| for (int index = 1; index < length(); index++) { // Index 0 is unused |
| if (tag_at(index).is_unresolved_klass() && |
| klass_at_if_loaded(cp, index) == NULL) { |
| return false; |
| } |
| } |
| // set_preresolution(); or some bit for future use |
| return true; |
| } |
| |
| Symbol* ConstantPool::exception_message(const constantPoolHandle& this_cp, int which, constantTag tag, oop pending_exception) { |
| // Dig out the detailed message to reuse if possible |
| Symbol* message = java_lang_Throwable::detail_message(pending_exception); |
| if (message != NULL) { |
| return message; |
| } |
| |
| // Return specific message for the tag |
| switch (tag.value()) { |
| case JVM_CONSTANT_UnresolvedClass: |
| // return the class name in the error message |
| message = this_cp->klass_name_at(which); |
| break; |
| case JVM_CONSTANT_MethodHandle: |
| // return the method handle name in the error message |
| message = this_cp->method_handle_name_ref_at(which); |
| break; |
| case JVM_CONSTANT_MethodType: |
| // return the method type signature in the error message |
| message = this_cp->method_type_signature_at(which); |
| break; |
| default: |
| ShouldNotReachHere(); |
| } |
| |
| return message; |
| } |
| |
| void ConstantPool::throw_resolution_error(const constantPoolHandle& this_cp, int which, TRAPS) { |
| Symbol* message = NULL; |
| Symbol* error = SystemDictionary::find_resolution_error(this_cp, which, &message); |
| assert(error != NULL && message != NULL, "checking"); |
| CLEAR_PENDING_EXCEPTION; |
| ResourceMark rm; |
| THROW_MSG(error, message->as_C_string()); |
| } |
| |
| // If resolution for Class, MethodHandle or MethodType fails, save the exception |
| // in the resolution error table, so that the same exception is thrown again. |
| void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, int which, |
| constantTag tag, TRAPS) { |
| Symbol* error = PENDING_EXCEPTION->klass()->name(); |
| |
| int error_tag = tag.error_value(); |
| |
| 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_cp->tag_at(which).value() != error_tag) { |
| Symbol* message = exception_message(this_cp, which, tag, PENDING_EXCEPTION); |
| SystemDictionary::add_resolution_error(this_cp, which, error, message); |
| // CAS in the tag. If a thread beat us to registering this error that's fine. |
| // If another thread resolved the reference, this is a race condition. This |
| // thread may have had a security manager or something temporary. |
| // This doesn't deterministically get an error. So why do we save this? |
| // We save this because jvmti can add classes to the bootclass path after |
| // this error, so it needs to get the same error if the error is first. |
| jbyte old_tag = Atomic::cmpxchg((jbyte)error_tag, |
| (jbyte*)this_cp->tag_addr_at(which), (jbyte)tag.value()); |
| if (old_tag != error_tag && old_tag != tag.value()) { |
| // MethodHandles and MethodType doesn't change to resolved version. |
| assert(this_cp->tag_at(which).is_klass(), "Wrong tag value"); |
| // Forget the exception and use the resolved class. |
| CLEAR_PENDING_EXCEPTION; |
| } |
| } else { |
| // some other thread put this in error state |
| throw_resolution_error(this_cp, which, CHECK); |
| } |
| } |
| |
| // Called to resolve constants in the constant pool and return an oop. |
| // Some constant pool entries cache their resolved oop. This is also |
| // called to create oops from constants to use in arguments for invokedynamic |
| oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp, int index, int cache_index, TRAPS) { |
| oop result_oop = NULL; |
| Handle throw_exception; |
| |
| if (cache_index == _possible_index_sentinel) { |
| // It is possible that this constant is one which is cached in the objects. |
| // We'll do a linear search. This should be OK because this usage is rare. |
| assert(index > 0, "valid index"); |
| cache_index = this_cp->cp_to_object_index(index); |
| } |
| assert(cache_index == _no_index_sentinel || cache_index >= 0, ""); |
| assert(index == _no_index_sentinel || index >= 0, ""); |
| |
| if (cache_index >= 0) { |
| result_oop = this_cp->resolved_references()->obj_at(cache_index); |
| if (result_oop != NULL) { |
| return result_oop; |
| // That was easy... |
| } |
| index = this_cp->object_to_cp_index(cache_index); |
| } |
| |
| jvalue prim_value; // temp used only in a few cases below |
| |
| constantTag tag = this_cp->tag_at(index); |
| |
| switch (tag.value()) { |
| |
| case JVM_CONSTANT_UnresolvedClass: |
| case JVM_CONSTANT_UnresolvedClassInError: |
| case JVM_CONSTANT_Class: |
| { |
| assert(cache_index == _no_index_sentinel, "should not have been set"); |
| Klass* resolved = klass_at_impl(this_cp, index, true, CHECK_NULL); |
| // ldc wants the java mirror. |
| result_oop = resolved->java_mirror(); |
| break; |
| } |
| |
| case JVM_CONSTANT_String: |
| assert(cache_index != _no_index_sentinel, "should have been set"); |
| if (this_cp->is_pseudo_string_at(index)) { |
| result_oop = this_cp->pseudo_string_at(index, cache_index); |
| break; |
| } |
| result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL); |
| break; |
| |
| case JVM_CONSTANT_MethodHandleInError: |
| case JVM_CONSTANT_MethodTypeInError: |
| { |
| throw_resolution_error(this_cp, index, CHECK_NULL); |
| break; |
| } |
| |
| case JVM_CONSTANT_MethodHandle: |
| { |
| int ref_kind = this_cp->method_handle_ref_kind_at(index); |
| int callee_index = this_cp->method_handle_klass_index_at(index); |
| Symbol* name = this_cp->method_handle_name_ref_at(index); |
| Symbol* signature = this_cp->method_handle_signature_ref_at(index); |
| if (PrintMiscellaneous) |
| tty->print_cr("resolve JVM_CONSTANT_MethodHandle:%d [%d/%d/%d] %s.%s", |
| ref_kind, index, this_cp->method_handle_index_at(index), |
| callee_index, name->as_C_string(), signature->as_C_string()); |
| KlassHandle callee; |
| { Klass* k = klass_at_impl(this_cp, callee_index, true, CHECK_NULL); |
| callee = KlassHandle(THREAD, k); |
| } |
| KlassHandle klass(THREAD, this_cp->pool_holder()); |
| Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind, |
| callee, name, signature, |
| THREAD); |
| result_oop = value(); |
| if (HAS_PENDING_EXCEPTION) { |
| save_and_throw_exception(this_cp, index, tag, CHECK_NULL); |
| } |
| break; |
| } |
| |
| case JVM_CONSTANT_MethodType: |
| { |
| Symbol* signature = this_cp->method_type_signature_at(index); |
| if (PrintMiscellaneous) |
| tty->print_cr("resolve JVM_CONSTANT_MethodType [%d/%d] %s", |
| index, this_cp->method_type_index_at(index), |
| signature->as_C_string()); |
| KlassHandle klass(THREAD, this_cp->pool_holder()); |
| Handle value = SystemDictionary::find_method_handle_type(signature, klass, THREAD); |
| result_oop = value(); |
| if (HAS_PENDING_EXCEPTION) { |
| save_and_throw_exception(this_cp, index, tag, CHECK_NULL); |
| } |
| break; |
| } |
| |
| case JVM_CONSTANT_Integer: |
| assert(cache_index == _no_index_sentinel, "should not have been set"); |
| prim_value.i = this_cp->int_at(index); |
| result_oop = java_lang_boxing_object::create(T_INT, &prim_value, CHECK_NULL); |
| break; |
| |
| case JVM_CONSTANT_Float: |
| assert(cache_index == _no_index_sentinel, "should not have been set"); |
| prim_value.f = this_cp->float_at(index); |
| result_oop = java_lang_boxing_object::create(T_FLOAT, &prim_value, CHECK_NULL); |
| break; |
| |
| case JVM_CONSTANT_Long: |
| assert(cache_index == _no_index_sentinel, "should not have been set"); |
| prim_value.j = this_cp->long_at(index); |
| result_oop = java_lang_boxing_object::create(T_LONG, &prim_value, CHECK_NULL); |
| break; |
| |
| case JVM_CONSTANT_Double: |
| assert(cache_index == _no_index_sentinel, "should not have been set"); |
| prim_value.d = this_cp->double_at(index); |
| result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL); |
| break; |
| |
| default: |
| DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d", |
| this_cp(), index, cache_index, tag.value())); |
| assert(false, "unexpected constant tag"); |
| break; |
| } |
| |
| if (cache_index >= 0) { |
| // Benign race condition: resolved_references may already be filled in. |
| // The important thing here is that all threads pick up the same result. |
| // It doesn't matter which racing thread wins, as long as only one |
| // result is used by all threads, and all future queries. |
| oop old_result = this_cp->resolved_references()->atomic_compare_exchange_oop(cache_index, result_oop, NULL); |
| if (old_result == NULL) { |
| return result_oop; // was installed |
| } else { |
| // Return the winning thread's result. This can be different than |
| // the result here for MethodHandles. |
| return old_result; |
| } |
| } else { |
| return result_oop; |
| } |
| } |
| |
| oop ConstantPool::uncached_string_at(int which, TRAPS) { |
| Symbol* sym = unresolved_string_at(which); |
| oop str = StringTable::intern(sym, CHECK_(NULL)); |
| assert(java_lang_String::is_instance(str), "must be string"); |
| return str; |
| } |
| |
| |
| oop ConstantPool::resolve_bootstrap_specifier_at_impl(const constantPoolHandle& this_cp, int index, TRAPS) { |
| assert(this_cp->tag_at(index).is_invoke_dynamic(), "Corrupted constant pool"); |
| |
| Handle bsm; |
| int argc; |
| { |
| // JVM_CONSTANT_InvokeDynamic is an ordered pair of [bootm, name&type], plus optional arguments |
| // The bootm, being a JVM_CONSTANT_MethodHandle, has its own cache entry. |
| // It is accompanied by the optional arguments. |
| int bsm_index = this_cp->invoke_dynamic_bootstrap_method_ref_index_at(index); |
| oop bsm_oop = this_cp->resolve_possibly_cached_constant_at(bsm_index, CHECK_NULL); |
| if (!java_lang_invoke_MethodHandle::is_instance(bsm_oop)) { |
| THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "BSM not an MethodHandle"); |
| } |
| |
| // Extract the optional static arguments. |
| argc = this_cp->invoke_dynamic_argument_count_at(index); |
| if (argc == 0) return bsm_oop; |
| |
| bsm = Handle(THREAD, bsm_oop); |
| } |
| |
| objArrayHandle info; |
| { |
| objArrayOop info_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(), 1+argc, CHECK_NULL); |
| info = objArrayHandle(THREAD, info_oop); |
| } |
| |
| info->obj_at_put(0, bsm()); |
| for (int i = 0; i < argc; i++) { |
| int arg_index = this_cp->invoke_dynamic_argument_index_at(index, i); |
| oop arg_oop = this_cp->resolve_possibly_cached_constant_at(arg_index, CHECK_NULL); |
| info->obj_at_put(1+i, arg_oop); |
| } |
| |
| return info(); |
| } |
| |
| oop ConstantPool::string_at_impl(const constantPoolHandle& this_cp, int which, int obj_index, TRAPS) { |
| // If the string has already been interned, this entry will be non-null |
| oop str = this_cp->resolved_references()->obj_at(obj_index); |
| if (str != NULL) return str; |
| Symbol* sym = this_cp->unresolved_string_at(which); |
| str = StringTable::intern(sym, CHECK_(NULL)); |
| this_cp->string_at_put(which, obj_index, str); |
| assert(java_lang_String::is_instance(str), "must be string"); |
| return str; |
| } |
| |
| |
| bool ConstantPool::klass_name_at_matches(instanceKlassHandle k, |
| int which) { |
| // Names are interned, so we can compare Symbol*s directly |
| Symbol* cp_name = klass_name_at(which); |
| return (cp_name == k->name()); |
| } |
| |
| |
| // Iterate over symbols and decrement ones which are Symbol*s |
| // This is done during GC. |
| // Only decrement the UTF8 symbols. Unresolved classes and strings point to |
| // these symbols but didn't increment the reference count. |
| void ConstantPool::unreference_symbols() { |
| for (int index = 1; index < length(); index++) { // Index 0 is unused |
| constantTag tag = tag_at(index); |
| if (tag.is_symbol()) { |
| symbol_at(index)->decrement_refcount(); |
| } |
| } |
| } |
| |
| |
| // Compare this constant pool's entry at index1 to the constant pool |
| // cp2's entry at index2. |
| bool ConstantPool::compare_entry_to(int index1, const constantPoolHandle& cp2, |
| int index2, TRAPS) { |
| |
| // The error tags are equivalent to non-error tags when comparing |
| jbyte t1 = tag_at(index1).non_error_value(); |
| jbyte t2 = cp2->tag_at(index2).non_error_value(); |
| |
| 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 as different. |
| // From the ConstantPool* API point of view, this is correct |
| // behavior. See VM_RedefineClasses::merge_constant_pools() to see how this |
| // plays out in the context of ConstantPool* merging. |
| return false; |
| } |
| |
| switch (t1) { |
| case JVM_CONSTANT_Class: |
| { |
| Klass* k1 = klass_at(index1, CHECK_false); |
| Klass* 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_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: |
| { |
| Symbol* k1 = klass_name_at(index1); |
| Symbol* k2 = cp2->klass_name_at(index2); |
| if (k1 == k2) { |
| return true; |
| } |
| } break; |
| |
| case JVM_CONSTANT_MethodType: |
| { |
| int k1 = method_type_index_at_error_ok(index1); |
| int k2 = cp2->method_type_index_at_error_ok(index2); |
| bool match = compare_entry_to(k1, cp2, k2, CHECK_false); |
| if (match) { |
| return true; |
| } |
| } break; |
| |
| case JVM_CONSTANT_MethodHandle: |
| { |
| int k1 = method_handle_ref_kind_at_error_ok(index1); |
| int k2 = cp2->method_handle_ref_kind_at_error_ok(index2); |
| if (k1 == k2) { |
| int i1 = method_handle_index_at_error_ok(index1); |
| int i2 = cp2->method_handle_index_at_error_ok(index2); |
| bool match = compare_entry_to(i1, cp2, i2, CHECK_false); |
| if (match) { |
| return true; |
| } |
| } |
| } break; |
| |
| case JVM_CONSTANT_InvokeDynamic: |
| { |
| int k1 = invoke_dynamic_name_and_type_ref_index_at(index1); |
| int k2 = cp2->invoke_dynamic_name_and_type_ref_index_at(index2); |
| int i1 = invoke_dynamic_bootstrap_specifier_index(index1); |
| int i2 = cp2->invoke_dynamic_bootstrap_specifier_index(index2); |
| // separate statements and variables because CHECK_false is used |
| bool match_entry = compare_entry_to(k1, cp2, k2, CHECK_false); |
| bool match_operand = compare_operand_to(i1, cp2, i2, CHECK_false); |
| return (match_entry && match_operand); |
| } break; |
| |
| case JVM_CONSTANT_String: |
| { |
| Symbol* s1 = unresolved_string_at(index1); |
| Symbol* s2 = cp2->unresolved_string_at(index2); |
| if (s1 == s2) { |
| return true; |
| } |
| } break; |
| |
| case JVM_CONSTANT_Utf8: |
| { |
| Symbol* s1 = symbol_at(index1); |
| Symbol* 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() |
| |
| |
| // Resize the operands array with delta_len and delta_size. |
| // Used in RedefineClasses for CP merge. |
| void ConstantPool::resize_operands(int delta_len, int delta_size, TRAPS) { |
| int old_len = operand_array_length(operands()); |
| int new_len = old_len + delta_len; |
| int min_len = (delta_len > 0) ? old_len : new_len; |
| |
| int old_size = operands()->length(); |
| int new_size = old_size + delta_size; |
| int min_size = (delta_size > 0) ? old_size : new_size; |
| |
| ClassLoaderData* loader_data = pool_holder()->class_loader_data(); |
| Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, new_size, CHECK); |
| |
| // Set index in the resized array for existing elements only |
| for (int idx = 0; idx < min_len; idx++) { |
| int offset = operand_offset_at(idx); // offset in original array |
| operand_offset_at_put(new_ops, idx, offset + 2*delta_len); // offset in resized array |
| } |
| // Copy the bootstrap specifiers only |
| Copy::conjoint_memory_atomic(operands()->adr_at(2*old_len), |
| new_ops->adr_at(2*new_len), |
| (min_size - 2*min_len) * sizeof(u2)); |
| // Explicitly deallocate old operands array. |
| // Note, it is not needed for 7u backport. |
| if ( operands() != NULL) { // the safety check |
| MetadataFactory::free_array<u2>(loader_data, operands()); |
| } |
| set_operands(new_ops); |
| } // end resize_operands() |
| |
| |
| // Extend the operands array with the length and size of the ext_cp operands. |
| // Used in RedefineClasses for CP merge. |
| void ConstantPool::extend_operands(const constantPoolHandle& ext_cp, TRAPS) { |
| int delta_len = operand_array_length(ext_cp->operands()); |
| if (delta_len == 0) { |
| return; // nothing to do |
| } |
| int delta_size = ext_cp->operands()->length(); |
| |
| assert(delta_len > 0 && delta_size > 0, "extended operands array must be bigger"); |
| |
| if (operand_array_length(operands()) == 0) { |
| ClassLoaderData* loader_data = pool_holder()->class_loader_data(); |
| Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, delta_size, CHECK); |
| // The first element index defines the offset of second part |
| operand_offset_at_put(new_ops, 0, 2*delta_len); // offset in new array |
| set_operands(new_ops); |
| } else { |
| resize_operands(delta_len, delta_size, CHECK); |
| } |
| |
| } // end extend_operands() |
| |
| |
| // Shrink the operands array to a smaller array with new_len length. |
| // Used in RedefineClasses for CP merge. |
| void ConstantPool::shrink_operands(int new_len, TRAPS) { |
| int old_len = operand_array_length(operands()); |
| if (new_len == old_len) { |
| return; // nothing to do |
| } |
| assert(new_len < old_len, "shrunken operands array must be smaller"); |
| |
| int free_base = operand_next_offset_at(new_len - 1); |
| int delta_len = new_len - old_len; |
| int delta_size = 2*delta_len + free_base - operands()->length(); |
| |
| resize_operands(delta_len, delta_size, CHECK); |
| |
| } // end shrink_operands() |
| |
| |
| void ConstantPool::copy_operands(const constantPoolHandle& from_cp, |
| const constantPoolHandle& to_cp, |
| TRAPS) { |
| |
| int from_oplen = operand_array_length(from_cp->operands()); |
| int old_oplen = operand_array_length(to_cp->operands()); |
| if (from_oplen != 0) { |
| ClassLoaderData* loader_data = to_cp->pool_holder()->class_loader_data(); |
| // append my operands to the target's operands array |
| if (old_oplen == 0) { |
| // Can't just reuse from_cp's operand list because of deallocation issues |
| int len = from_cp->operands()->length(); |
| Array<u2>* new_ops = MetadataFactory::new_array<u2>(loader_data, len, CHECK); |
| Copy::conjoint_memory_atomic( |
| from_cp->operands()->adr_at(0), new_ops->adr_at(0), len * sizeof(u2)); |
| to_cp->set_operands(new_ops); |
| } else { |
| int old_len = to_cp->operands()->length(); |
| int from_len = from_cp->operands()->length(); |
| int old_off = old_oplen * sizeof(u2); |
| int from_off = from_oplen * sizeof(u2); |
| // Use the metaspace for the destination constant pool |
| Array<u2>* new_operands = MetadataFactory::new_array<u2>(loader_data, old_len + from_len, CHECK); |
| int fillp = 0, len = 0; |
| // first part of dest |
| Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(0), |
| new_operands->adr_at(fillp), |
| (len = old_off) * sizeof(u2)); |
| fillp += len; |
| // first part of src |
| Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(0), |
| new_operands->adr_at(fillp), |
| (len = from_off) * sizeof(u2)); |
| fillp += len; |
| // second part of dest |
| Copy::conjoint_memory_atomic(to_cp->operands()->adr_at(old_off), |
| new_operands->adr_at(fillp), |
| (len = old_len - old_off) * sizeof(u2)); |
| fillp += len; |
| // second part of src |
| Copy::conjoint_memory_atomic(from_cp->operands()->adr_at(from_off), |
| new_operands->adr_at(fillp), |
| (len = from_len - from_off) * sizeof(u2)); |
| fillp += len; |
| assert(fillp == new_operands->length(), ""); |
| |
| // Adjust indexes in the first part of the copied operands array. |
| for (int j = 0; j < from_oplen; j++) { |
| int offset = operand_offset_at(new_operands, old_oplen + j); |
| assert(offset == operand_offset_at(from_cp->operands(), j), "correct copy"); |
| offset += old_len; // every new tuple is preceded by old_len extra u2's |
| operand_offset_at_put(new_operands, old_oplen + j, offset); |
| } |
| |
| // replace target operands array with combined array |
| to_cp->set_operands(new_operands); |
| } |
| } |
| } // end copy_operands() |
| |
| |
| // 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 ConstantPool::copy_cp_to_impl(const constantPoolHandle& from_cp, int start_i, int end_i, |
| const 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(from_cp, src_i, to_cp, dest_i, CHECK); |
| |
| switch (from_cp->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; |
| } |
| } |
| copy_operands(from_cp, to_cp, CHECK); |
| |
| } // end copy_cp_to_impl() |
| |
| |
| // Copy this constant pool's entry at from_i to the constant pool |
| // to_cp's entry at to_i. |
| void ConstantPool::copy_entry_to(const constantPoolHandle& from_cp, int from_i, |
| const constantPoolHandle& to_cp, int to_i, |
| TRAPS) { |
| |
| int tag = from_cp->tag_at(from_i).value(); |
| switch (tag) { |
| case JVM_CONSTANT_Class: |
| { |
| Klass* k = from_cp->klass_at(from_i, CHECK); |
| to_cp->klass_at_put(to_i, k); |
| } break; |
| |
| case JVM_CONSTANT_ClassIndex: |
| { |
| jint ki = from_cp->klass_index_at(from_i); |
| to_cp->klass_index_at_put(to_i, ki); |
| } break; |
| |
| case JVM_CONSTANT_Double: |
| { |
| jdouble d = from_cp->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 = from_cp->uncached_klass_ref_index_at(from_i); |
| int name_and_type_index = from_cp->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 = from_cp->float_at(from_i); |
| to_cp->float_at_put(to_i, f); |
| } break; |
| |
| case JVM_CONSTANT_Integer: |
| { |
| jint i = from_cp->int_at(from_i); |
| to_cp->int_at_put(to_i, i); |
| } break; |
| |
| case JVM_CONSTANT_InterfaceMethodref: |
| { |
| int class_index = from_cp->uncached_klass_ref_index_at(from_i); |
| int name_and_type_index = from_cp->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 = from_cp->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 = from_cp->uncached_klass_ref_index_at(from_i); |
| int name_and_type_index = from_cp->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 = from_cp->name_ref_index_at(from_i); |
| int signature_ref_index = from_cp->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_StringIndex: |
| { |
| jint si = from_cp->string_index_at(from_i); |
| to_cp->string_index_at_put(to_i, si); |
| } break; |
| |
| case JVM_CONSTANT_UnresolvedClass: |
| case JVM_CONSTANT_UnresolvedClassInError: |
| { |
| // Can be resolved after checking tag, so check the slot first. |
| CPSlot entry = from_cp->slot_at(from_i); |
| if (entry.is_resolved()) { |
| assert(entry.get_klass()->is_klass(), "must be"); |
| // Already resolved |
| to_cp->klass_at_put(to_i, entry.get_klass()); |
| } else { |
| to_cp->unresolved_klass_at_put(to_i, entry.get_symbol()); |
| } |
| } break; |
| |
| case JVM_CONSTANT_String: |
| { |
| Symbol* s = from_cp->unresolved_string_at(from_i); |
| to_cp->unresolved_string_at_put(to_i, s); |
| } break; |
| |
| case JVM_CONSTANT_Utf8: |
| { |
| Symbol* s = from_cp->symbol_at(from_i); |
| // Need to increase refcount, the old one will be thrown away and deferenced |
| s->increment_refcount(); |
| to_cp->symbol_at_put(to_i, s); |
| } break; |
| |
| case JVM_CONSTANT_MethodType: |
| case JVM_CONSTANT_MethodTypeInError: |
| { |
| jint k = from_cp->method_type_index_at_error_ok(from_i); |
| to_cp->method_type_index_at_put(to_i, k); |
| } break; |
| |
| case JVM_CONSTANT_MethodHandle: |
| case JVM_CONSTANT_MethodHandleInError: |
| { |
| int k1 = from_cp->method_handle_ref_kind_at_error_ok(from_i); |
| int k2 = from_cp->method_handle_index_at_error_ok(from_i); |
| to_cp->method_handle_index_at_put(to_i, k1, k2); |
| } break; |
| |
| case JVM_CONSTANT_InvokeDynamic: |
| { |
| int k1 = from_cp->invoke_dynamic_bootstrap_specifier_index(from_i); |
| int k2 = from_cp->invoke_dynamic_name_and_type_ref_index_at(from_i); |
| k1 += operand_array_length(to_cp->operands()); // to_cp might already have operands |
| to_cp->invoke_dynamic_at_put(to_i, k1, k2); |
| } 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; |
| } |
| } // 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 ConstantPool::find_matching_entry(int pattern_i, |
| const 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() |
| |
| |
| // Compare this constant pool's bootstrap specifier at idx1 to the constant pool |
| // cp2's bootstrap specifier at idx2. |
| bool ConstantPool::compare_operand_to(int idx1, const constantPoolHandle& cp2, int idx2, TRAPS) { |
| int k1 = operand_bootstrap_method_ref_index_at(idx1); |
| int k2 = cp2->operand_bootstrap_method_ref_index_at(idx2); |
| bool match = compare_entry_to(k1, cp2, k2, CHECK_false); |
| |
| if (!match) { |
| return false; |
| } |
| int argc = operand_argument_count_at(idx1); |
| if (argc == cp2->operand_argument_count_at(idx2)) { |
| for (int j = 0; j < argc; j++) { |
| k1 = operand_argument_index_at(idx1, j); |
| k2 = cp2->operand_argument_index_at(idx2, j); |
| match = compare_entry_to(k1, cp2, k2, CHECK_false); |
| if (!match) { |
| return false; |
| } |
| } |
| return true; // got through loop; all elements equal |
| } |
| return false; |
| } // end compare_operand_to() |
| |
| // Search constant pool search_cp for a bootstrap specifier that matches |
| // this constant pool's bootstrap specifier at pattern_i index. |
| // Return the index of a matching bootstrap specifier or (-1) if there is no match. |
| int ConstantPool::find_matching_operand(int pattern_i, |
| const constantPoolHandle& search_cp, int search_len, TRAPS) { |
| for (int i = 0; i < search_len; i++) { |
| bool found = compare_operand_to(pattern_i, search_cp, i, CHECK_(-1)); |
| if (found) { |
| return i; |
| } |
| } |
| return -1; // bootstrap specifier not found; return unused index (-1) |
| } // end find_matching_operand() |
| |
| |
| #ifndef PRODUCT |
| |
| const char* ConstantPool::printable_name_at(int which) { |
| |
| constantTag tag = tag_at(which); |
| |
| if (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 debugging of constant pool |
| const bool debug_cpool = false; |
| |
| #define DBG(code) do { if (debug_cpool) { (code); } } while(0) |
| |
| static void print_cpool_bytes(jint cnt, u1 *bytes) { |
| const char* WARN_MSG = "Must not be such entry!"; |
| 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, (int64_t) *(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; |
| } |
| } |
| 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 ConstantPool::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_MethodType: |
| case JVM_CONSTANT_MethodTypeInError: |
| return 3; |
| |
| case JVM_CONSTANT_MethodHandle: |
| case JVM_CONSTANT_MethodHandleInError: |
| return 4; //tag, ref_kind, ref_index |
| |
| 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_InvokeDynamic: |
| // u1 tag, u2 bsm, u2 nt |
| 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 ConstantPool::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: { |
| Symbol* 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: { |
| Symbol* 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 ConstantPool::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: { |
| Symbol* 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; |
| Symbol* 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: { |
| *bytes = JVM_CONSTANT_String; |
| Symbol* 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(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, sym->as_utf8())); |
| 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; |
| } |
| case JVM_CONSTANT_MethodHandle: |
| case JVM_CONSTANT_MethodHandleInError: { |
| *bytes = JVM_CONSTANT_MethodHandle; |
| int kind = method_handle_ref_kind_at_error_ok(idx); |
| idx1 = method_handle_index_at_error_ok(idx); |
| *(bytes+1) = (unsigned char) kind; |
| Bytes::put_Java_u2((address) (bytes+2), idx1); |
| DBG(printf("JVM_CONSTANT_MethodHandle: %d %hd", kind, idx1)); |
| break; |
| } |
| case JVM_CONSTANT_MethodType: |
| case JVM_CONSTANT_MethodTypeInError: { |
| *bytes = JVM_CONSTANT_MethodType; |
| idx1 = method_type_index_at_error_ok(idx); |
| Bytes::put_Java_u2((address) (bytes+1), idx1); |
| DBG(printf("JVM_CONSTANT_MethodType: %hd", idx1)); |
| break; |
| } |
| case JVM_CONSTANT_InvokeDynamic: { |
| *bytes = tag; |
| idx1 = extract_low_short_from_int(*int_at_addr(idx)); |
| idx2 = extract_high_short_from_int(*int_at_addr(idx)); |
| assert(idx2 == invoke_dynamic_name_and_type_ref_index_at(idx), "correct half of u4"); |
| Bytes::put_Java_u2((address) (bytes+1), idx1); |
| Bytes::put_Java_u2((address) (bytes+3), idx2); |
| DBG(printf("JVM_CONSTANT_InvokeDynamic: %hd %hd", idx1, idx2)); |
| 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 */ |
| |
| #undef DBG |
| |
| |
| void ConstantPool::set_on_stack(const bool value) { |
| if (value) { |
| // Only record if it's not already set. |
| if (!on_stack()) { |
| _flags |= _on_stack; |
| MetadataOnStackMark::record(this); |
| } |
| } else { |
| // Clearing is done single-threadedly. |
| _flags &= ~_on_stack; |
| } |
| } |
| |
| // JSR 292 support for patching constant pool oops after the class is linked and |
| // the oop array for resolved references are created. |
| // We can't do this during classfile parsing, which is how the other indexes are |
| // patched. The other patches are applied early for some error checking |
| // so only defer the pseudo_strings. |
| void ConstantPool::patch_resolved_references(GrowableArray<Handle>* cp_patches) { |
| for (int index = 1; index < cp_patches->length(); index++) { // Index 0 is unused |
| Handle patch = cp_patches->at(index); |
| if (patch.not_null()) { |
| assert (tag_at(index).is_string(), "should only be string left"); |
| // Patching a string means pre-resolving it. |
| // The spelling in the constant pool is ignored. |
| // The constant reference may be any object whatever. |
| // If it is not a real interned string, the constant is referred |
| // to as a "pseudo-string", and must be presented to the CP |
| // explicitly, because it may require scavenging. |
| int obj_index = cp_to_object_index(index); |
| pseudo_string_at_put(index, obj_index, patch()); |
| DEBUG_ONLY(cp_patches->at_put(index, Handle());) |
| } |
| } |
| #ifdef ASSERT |
| // Ensure that all the patches have been used. |
| for (int index = 0; index < cp_patches->length(); index++) { |
| assert(cp_patches->at(index).is_null(), |
| "Unused constant pool patch at %d in class file %s", |
| index, |
| pool_holder()->external_name()); |
| } |
| #endif // ASSERT |
| } |
| |
| #ifndef PRODUCT |
| |
| // CompileTheWorld support. Preload all classes loaded references in the passed in constantpool |
| void ConstantPool::preload_and_initialize_all_classes(ConstantPool* obj, TRAPS) { |
| guarantee(obj->is_constantPool(), "object must be constant pool"); |
| constantPoolHandle cp(THREAD, (ConstantPool*)obj); |
| guarantee(cp->pool_holder() != NULL, "must be fully loaded"); |
| |
| for (int i = 0; i< cp->length(); i++) { |
| if (cp->tag_at(i).is_unresolved_klass()) { |
| // This will force loading of the class |
| Klass* klass = cp->klass_at(i, CHECK); |
| if (klass->is_instance_klass()) { |
| // Force initialization of class |
| InstanceKlass::cast(klass)->initialize(CHECK); |
| } |
| } |
| } |
| } |
| |
| #endif |
| |
| |
| // Printing |
| |
| void ConstantPool::print_on(outputStream* st) const { |
| assert(is_constantPool(), "must be constantPool"); |
| st->print_cr("%s", internal_name()); |
| if (flags() != 0) { |
| st->print(" - flags: 0x%x", flags()); |
| if (has_preresolution()) st->print(" has_preresolution"); |
| if (on_stack()) st->print(" on_stack"); |
| st->cr(); |
| } |
| if (pool_holder() != NULL) { |
| st->print_cr(" - holder: " INTPTR_FORMAT, p2i(pool_holder())); |
| } |
| st->print_cr(" - cache: " INTPTR_FORMAT, p2i(cache())); |
| st->print_cr(" - resolved_references: " INTPTR_FORMAT, p2i(resolved_references())); |
| st->print_cr(" - reference_map: " INTPTR_FORMAT, p2i(reference_map())); |
| |
| for (int index = 1; index < length(); index++) { // Index 0 is unused |
| ((ConstantPool*)this)->print_entry_on(index, st); |
| switch (tag_at(index).value()) { |
| case JVM_CONSTANT_Long : |
| case JVM_CONSTANT_Double : |
| index++; // Skip entry following eigth-byte constant |
| } |
| |
| } |
| st->cr(); |
| } |
| |
| // Print one constant pool entry |
| void ConstantPool::print_entry_on(const int index, outputStream* st) { |
| EXCEPTION_MARK; |
| st->print(" - %3d : ", index); |
| tag_at(index).print_on(st); |
| st->print(" : "); |
| switch (tag_at(index).value()) { |
| case JVM_CONSTANT_Class : |
| { Klass* k = klass_at(index, CATCH); |
| guarantee(k != NULL, "need klass"); |
| k->print_value_on(st); |
| st->print(" {" PTR_FORMAT "}", p2i(k)); |
| } |
| break; |
| case JVM_CONSTANT_Fieldref : |
| case JVM_CONSTANT_Methodref : |
| case JVM_CONSTANT_InterfaceMethodref : |
| st->print("klass_index=%d", uncached_klass_ref_index_at(index)); |
| st->print(" name_and_type_index=%d", uncached_name_and_type_ref_index_at(index)); |
| break; |
| case JVM_CONSTANT_String : |
| if (is_pseudo_string_at(index)) { |
| oop anObj = pseudo_string_at(index); |
| anObj->print_value_on(st); |
| st->print(" {" PTR_FORMAT "}", p2i(anObj)); |
| } else { |
| unresolved_string_at(index)->print_value_on(st); |
| } |
| break; |
| case JVM_CONSTANT_Integer : |
| st->print("%d", int_at(index)); |
| break; |
| case JVM_CONSTANT_Float : |
| st->print("%f", float_at(index)); |
| break; |
| case JVM_CONSTANT_Long : |
| st->print_jlong(long_at(index)); |
| break; |
| case JVM_CONSTANT_Double : |
| st->print("%lf", double_at(index)); |
| break; |
| case JVM_CONSTANT_NameAndType : |
| st->print("name_index=%d", name_ref_index_at(index)); |
| st->print(" signature_index=%d", signature_ref_index_at(index)); |
| break; |
| case JVM_CONSTANT_Utf8 : |
| symbol_at(index)->print_value_on(st); |
| break; |
| case JVM_CONSTANT_UnresolvedClass : // fall-through |
| case JVM_CONSTANT_UnresolvedClassInError: { |
| CPSlot entry = slot_at(index); |
| if (entry.is_resolved()) { |
| entry.get_klass()->print_value_on(st); |
| } else { |
| entry.get_symbol()->print_value_on(st); |
| } |
| } |
| break; |
| case JVM_CONSTANT_MethodHandle : |
| case JVM_CONSTANT_MethodHandleInError : |
| st->print("ref_kind=%d", method_handle_ref_kind_at_error_ok(index)); |
| st->print(" ref_index=%d", method_handle_index_at_error_ok(index)); |
| break; |
| case JVM_CONSTANT_MethodType : |
| case JVM_CONSTANT_MethodTypeInError : |
| st->print("signature_index=%d", method_type_index_at_error_ok(index)); |
| break; |
| case JVM_CONSTANT_InvokeDynamic : |
| { |
| st->print("bootstrap_method_index=%d", invoke_dynamic_bootstrap_method_ref_index_at(index)); |
| st->print(" name_and_type_index=%d", invoke_dynamic_name_and_type_ref_index_at(index)); |
| int argc = invoke_dynamic_argument_count_at(index); |
| if (argc > 0) { |
| for (int arg_i = 0; arg_i < argc; arg_i++) { |
| int arg = invoke_dynamic_argument_index_at(index, arg_i); |
| st->print((arg_i == 0 ? " arguments={%d" : ", %d"), arg); |
| } |
| st->print("}"); |
| } |
| } |
| break; |
| default: |
| ShouldNotReachHere(); |
| break; |
| } |
| st->cr(); |
| } |
| |
| void ConstantPool::print_value_on(outputStream* st) const { |
| assert(is_constantPool(), "must be constantPool"); |
| st->print("constant pool [%d]", length()); |
| if (has_preresolution()) st->print("/preresolution"); |
| if (operands() != NULL) st->print("/operands[%d]", operands()->length()); |
| print_address_on(st); |
| st->print(" for "); |
| pool_holder()->print_value_on(st); |
| if (pool_holder() != NULL) { |
| bool extra = (pool_holder()->constants() != this); |
| if (extra) st->print(" (extra)"); |
| } |
| if (cache() != NULL) { |
| st->print(" cache=" PTR_FORMAT, p2i(cache())); |
| } |
| } |
| |
| #if INCLUDE_SERVICES |
| // Size Statistics |
| void ConstantPool::collect_statistics(KlassSizeStats *sz) const { |
| sz->_cp_all_bytes += (sz->_cp_bytes = sz->count(this)); |
| sz->_cp_all_bytes += (sz->_cp_tags_bytes = sz->count_array(tags())); |
| sz->_cp_all_bytes += (sz->_cp_cache_bytes = sz->count(cache())); |
| sz->_cp_all_bytes += (sz->_cp_operands_bytes = sz->count_array(operands())); |
| sz->_cp_all_bytes += (sz->_cp_refmap_bytes = sz->count_array(reference_map())); |
| |
| sz->_ro_bytes += sz->_cp_operands_bytes + sz->_cp_tags_bytes + |
| sz->_cp_refmap_bytes; |
| sz->_rw_bytes += sz->_cp_bytes + sz->_cp_cache_bytes; |
| } |
| #endif // INCLUDE_SERVICES |
| |
| // Verification |
| |
| void ConstantPool::verify_on(outputStream* st) { |
| guarantee(is_constantPool(), "object must be constant pool"); |
| for (int i = 0; i< length(); i++) { |
| constantTag tag = tag_at(i); |
| CPSlot entry = slot_at(i); |
| if (tag.is_klass()) { |
| if (entry.is_resolved()) { |
| guarantee(entry.get_klass()->is_klass(), "should be klass"); |
| } |
| } else if (tag.is_unresolved_klass()) { |
| if (entry.is_resolved()) { |
| guarantee(entry.get_klass()->is_klass(), "should be klass"); |
| } |
| } else if (tag.is_symbol()) { |
| guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); |
| } else if (tag.is_string()) { |
| guarantee(entry.get_symbol()->refcount() != 0, "should have nonzero reference count"); |
| } |
| } |
| if (cache() != NULL) { |
| // Note: cache() can be NULL before a class is completely setup or |
| // in temporary constant pools used during constant pool merging |
| guarantee(cache()->is_constantPoolCache(), "should be constant pool cache"); |
| } |
| if (pool_holder() != NULL) { |
| // Note: pool_holder() can be NULL in temporary constant pools |
| // used during constant pool merging |
| guarantee(pool_holder()->is_klass(), "should be klass"); |
| } |
| } |
| |
| |
| void SymbolHashMap::add_entry(Symbol* 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(Symbol* 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; |
| } |