/* * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "precompiled.hpp" #include "classfile/classFileParser.hpp" #include "classfile/classLoader.hpp" #include "classfile/classLoaderData.hpp" #include "classfile/classLoaderData.inline.hpp" #include "classfile/defaultMethods.hpp" #include "classfile/javaClasses.hpp" #include "classfile/symbolTable.hpp" #include "classfile/systemDictionary.hpp" #if INCLUDE_CDS #include "classfile/systemDictionaryShared.hpp" #endif #include "classfile/verificationType.hpp" #include "classfile/verifier.hpp" #include "classfile/vmSymbols.hpp" #include "memory/allocation.hpp" #include "memory/gcLocker.hpp" #include "memory/metadataFactory.hpp" #include "memory/oopFactory.hpp" #include "memory/referenceType.hpp" #include "memory/universe.inline.hpp" #include "oops/constantPool.hpp" #include "oops/fieldStreams.hpp" #include "oops/instanceKlass.hpp" #include "oops/instanceMirrorKlass.hpp" #include "oops/klass.inline.hpp" #include "oops/klassVtable.hpp" #include "oops/method.hpp" #include "oops/symbol.hpp" #include "prims/jvm.h" #include "prims/jvmtiExport.hpp" #include "prims/jvmtiThreadState.hpp" #include "runtime/javaCalls.hpp" #include "runtime/perfData.hpp" #include "runtime/reflection.hpp" #include "runtime/signature.hpp" #include "runtime/timer.hpp" #include "services/classLoadingService.hpp" #include "services/threadService.hpp" #include "utilities/array.hpp" #include "utilities/globalDefinitions.hpp" #include "utilities/ostream.hpp" // We generally try to create the oops directly when parsing, rather than // allocating temporary data structures and copying the bytes twice. A // temporary area is only needed when parsing utf8 entries in the constant // pool and when parsing line number tables. // We add assert in debug mode when class format is not checked. #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE #define JAVA_MIN_SUPPORTED_VERSION 45 #define JAVA_MAX_SUPPORTED_VERSION 52 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0 // Used for two backward compatibility reasons: // - to check for new additions to the class file format in JDK1.5 // - to check for bug fixes in the format checker in JDK1.5 #define JAVA_1_5_VERSION 49 // Used for backward compatibility reasons: // - to check for javac bug fixes that happened after 1.5 // - also used as the max version when running in jdk6 #define JAVA_6_VERSION 50 // Used for backward compatibility reasons: // - to check NameAndType_info signatures more aggressively #define JAVA_7_VERSION 51 // Extension method support. #define JAVA_8_VERSION 52 void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) { // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize // this function (_current can be allocated in a register, with scalar // replacement of aggregates). The _current pointer is copied back to // stream() when this function returns. DON'T call another method within // this method that uses stream(). ClassFileStream* cfs0 = stream(); ClassFileStream cfs1 = *cfs0; ClassFileStream* cfs = &cfs1; #ifdef ASSERT assert(cfs->allocated_on_stack(),"should be local"); u1* old_current = cfs0->current(); #endif Handle class_loader(THREAD, _loader_data->class_loader()); // Used for batching symbol allocations. const char* names[SymbolTable::symbol_alloc_batch_size]; int lengths[SymbolTable::symbol_alloc_batch_size]; int indices[SymbolTable::symbol_alloc_batch_size]; unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; int names_count = 0; // parsing Index 0 is unused for (int index = 1; index < length; index++) { // Each of the following case guarantees one more byte in the stream // for the following tag or the access_flags following constant pool, // so we don't need bounds-check for reading tag. u1 tag = cfs->get_u1_fast(); switch (tag) { case JVM_CONSTANT_Class : { cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags u2 name_index = cfs->get_u2_fast(); _cp->klass_index_at_put(index, name_index); } break; case JVM_CONSTANT_Fieldref : { cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags u2 class_index = cfs->get_u2_fast(); u2 name_and_type_index = cfs->get_u2_fast(); _cp->field_at_put(index, class_index, name_and_type_index); } break; case JVM_CONSTANT_Methodref : { cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags u2 class_index = cfs->get_u2_fast(); u2 name_and_type_index = cfs->get_u2_fast(); _cp->method_at_put(index, class_index, name_and_type_index); } break; case JVM_CONSTANT_InterfaceMethodref : { cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags u2 class_index = cfs->get_u2_fast(); u2 name_and_type_index = cfs->get_u2_fast(); _cp->interface_method_at_put(index, class_index, name_and_type_index); } break; case JVM_CONSTANT_String : { cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags u2 string_index = cfs->get_u2_fast(); _cp->string_index_at_put(index, string_index); } break; case JVM_CONSTANT_MethodHandle : case JVM_CONSTANT_MethodType : if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { classfile_parse_error( "Class file version does not support constant tag %u in class file %s", tag, CHECK); } if (tag == JVM_CONSTANT_MethodHandle) { cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags u1 ref_kind = cfs->get_u1_fast(); u2 method_index = cfs->get_u2_fast(); _cp->method_handle_index_at_put(index, ref_kind, method_index); } else if (tag == JVM_CONSTANT_MethodType) { cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags u2 signature_index = cfs->get_u2_fast(); _cp->method_type_index_at_put(index, signature_index); } else { ShouldNotReachHere(); } break; case JVM_CONSTANT_InvokeDynamic : { if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { classfile_parse_error( "Class file version does not support constant tag %u in class file %s", tag, CHECK); } cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags u2 bootstrap_specifier_index = cfs->get_u2_fast(); u2 name_and_type_index = cfs->get_u2_fast(); if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later _cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index); } break; case JVM_CONSTANT_Integer : { cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags u4 bytes = cfs->get_u4_fast(); _cp->int_at_put(index, (jint) bytes); } break; case JVM_CONSTANT_Float : { cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags u4 bytes = cfs->get_u4_fast(); _cp->float_at_put(index, *(jfloat*)&bytes); } break; case JVM_CONSTANT_Long : // A mangled type might cause you to overrun allocated memory guarantee_property(index+1 < length, "Invalid constant pool entry %u in class file %s", index, CHECK); { cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags u8 bytes = cfs->get_u8_fast(); _cp->long_at_put(index, bytes); } index++; // Skip entry following eigth-byte constant, see JVM book p. 98 break; case JVM_CONSTANT_Double : // A mangled type might cause you to overrun allocated memory guarantee_property(index+1 < length, "Invalid constant pool entry %u in class file %s", index, CHECK); { cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags u8 bytes = cfs->get_u8_fast(); _cp->double_at_put(index, *(jdouble*)&bytes); } index++; // Skip entry following eigth-byte constant, see JVM book p. 98 break; case JVM_CONSTANT_NameAndType : { cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags u2 name_index = cfs->get_u2_fast(); u2 signature_index = cfs->get_u2_fast(); _cp->name_and_type_at_put(index, name_index, signature_index); } break; case JVM_CONSTANT_Utf8 : { cfs->guarantee_more(2, CHECK); // utf8_length u2 utf8_length = cfs->get_u2_fast(); u1* utf8_buffer = cfs->get_u1_buffer(); assert(utf8_buffer != NULL, "null utf8 buffer"); // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags cfs->skip_u1_fast(utf8_length); // Before storing the symbol, make sure it's legal if (_need_verify) { verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK); } if (has_cp_patch_at(index)) { Handle patch = clear_cp_patch_at(index); guarantee_property(java_lang_String::is_instance(patch()), "Illegal utf8 patch at %d in class file %s", index, CHECK); char* str = java_lang_String::as_utf8_string(patch()); // (could use java_lang_String::as_symbol instead, but might as well batch them) utf8_buffer = (u1*) str; utf8_length = (int) strlen(str); } unsigned int hash; Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash); if (result == NULL) { names[names_count] = (char*)utf8_buffer; lengths[names_count] = utf8_length; indices[names_count] = index; hashValues[names_count++] = hash; if (names_count == SymbolTable::symbol_alloc_batch_size) { SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK); names_count = 0; } } else { _cp->symbol_at_put(index, result); } } break; default: classfile_parse_error( "Unknown constant tag %u in class file %s", tag, CHECK); break; } } // Allocate the remaining symbols if (names_count > 0) { SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK); } // Copy _current pointer of local copy back to stream(). #ifdef ASSERT assert(cfs0->current() == old_current, "non-exclusive use of stream()"); #endif cfs0->set_current(cfs1.current()); } bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); } inline Symbol* check_symbol_at(constantPoolHandle cp, int index) { if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) return cp->symbol_at(index); else return NULL; } constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) { ClassFileStream* cfs = stream(); constantPoolHandle nullHandle; cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag u2 length = cfs->get_u2_fast(); guarantee_property( length >= 1, "Illegal constant pool size %u in class file %s", length, CHECK_(nullHandle)); ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length, CHECK_(nullHandle)); _cp = constant_pool; // save in case of errors constantPoolHandle cp (THREAD, constant_pool); // parsing constant pool entries parse_constant_pool_entries(length, CHECK_(nullHandle)); int index = 1; // declared outside of loops for portability // first verification pass - validate cross references and fixup class and string constants for (index = 1; index < length; index++) { // Index 0 is unused jbyte tag = cp->tag_at(index).value(); switch (tag) { case JVM_CONSTANT_Class : ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present break; case JVM_CONSTANT_Fieldref : // fall through case JVM_CONSTANT_Methodref : // fall through case JVM_CONSTANT_InterfaceMethodref : { if (!_need_verify) break; int klass_ref_index = cp->klass_ref_index_at(index); int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); check_property(valid_klass_reference_at(klass_ref_index), "Invalid constant pool index %u in class file %s", klass_ref_index, CHECK_(nullHandle)); check_property(valid_cp_range(name_and_type_ref_index, length) && cp->tag_at(name_and_type_ref_index).is_name_and_type(), "Invalid constant pool index %u in class file %s", name_and_type_ref_index, CHECK_(nullHandle)); break; } case JVM_CONSTANT_String : ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present break; case JVM_CONSTANT_Integer : break; case JVM_CONSTANT_Float : break; case JVM_CONSTANT_Long : case JVM_CONSTANT_Double : index++; check_property( (index < length && cp->tag_at(index).is_invalid()), "Improper constant pool long/double index %u in class file %s", index, CHECK_(nullHandle)); break; case JVM_CONSTANT_NameAndType : { if (!_need_verify) break; int name_ref_index = cp->name_ref_index_at(index); int signature_ref_index = cp->signature_ref_index_at(index); check_property(valid_symbol_at(name_ref_index), "Invalid constant pool index %u in class file %s", name_ref_index, CHECK_(nullHandle)); check_property(valid_symbol_at(signature_ref_index), "Invalid constant pool index %u in class file %s", signature_ref_index, CHECK_(nullHandle)); break; } case JVM_CONSTANT_Utf8 : break; case JVM_CONSTANT_UnresolvedClass : // fall-through case JVM_CONSTANT_UnresolvedClassInError: ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present break; case JVM_CONSTANT_ClassIndex : { int class_index = cp->klass_index_at(index); check_property(valid_symbol_at(class_index), "Invalid constant pool index %u in class file %s", class_index, CHECK_(nullHandle)); cp->unresolved_klass_at_put(index, cp->symbol_at(class_index)); } break; case JVM_CONSTANT_StringIndex : { int string_index = cp->string_index_at(index); check_property(valid_symbol_at(string_index), "Invalid constant pool index %u in class file %s", string_index, CHECK_(nullHandle)); Symbol* sym = cp->symbol_at(string_index); cp->unresolved_string_at_put(index, sym); } break; case JVM_CONSTANT_MethodHandle : { int ref_index = cp->method_handle_index_at(index); check_property( valid_cp_range(ref_index, length), "Invalid constant pool index %u in class file %s", ref_index, CHECK_(nullHandle)); constantTag tag = cp->tag_at(ref_index); int ref_kind = cp->method_handle_ref_kind_at(index); switch (ref_kind) { case JVM_REF_getField: case JVM_REF_getStatic: case JVM_REF_putField: case JVM_REF_putStatic: check_property( tag.is_field(), "Invalid constant pool index %u in class file %s (not a field)", ref_index, CHECK_(nullHandle)); break; case JVM_REF_invokeVirtual: case JVM_REF_newInvokeSpecial: check_property( tag.is_method(), "Invalid constant pool index %u in class file %s (not a method)", ref_index, CHECK_(nullHandle)); break; case JVM_REF_invokeStatic: case JVM_REF_invokeSpecial: check_property(tag.is_method() || ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()), "Invalid constant pool index %u in class file %s (not a method)", ref_index, CHECK_(nullHandle)); break; case JVM_REF_invokeInterface: check_property( tag.is_interface_method(), "Invalid constant pool index %u in class file %s (not an interface method)", ref_index, CHECK_(nullHandle)); break; default: classfile_parse_error( "Bad method handle kind at constant pool index %u in class file %s", index, CHECK_(nullHandle)); } // Keep the ref_index unchanged. It will be indirected at link-time. } break; case JVM_CONSTANT_MethodType : { int ref_index = cp->method_type_index_at(index); check_property(valid_symbol_at(ref_index), "Invalid constant pool index %u in class file %s", ref_index, CHECK_(nullHandle)); } break; case JVM_CONSTANT_InvokeDynamic : { int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index); check_property(valid_cp_range(name_and_type_ref_index, length) && cp->tag_at(name_and_type_ref_index).is_name_and_type(), "Invalid constant pool index %u in class file %s", name_and_type_ref_index, CHECK_(nullHandle)); // bootstrap specifier index must be checked later, when BootstrapMethods attr is available break; } default: fatal(err_msg("bad constant pool tag value %u", cp->tag_at(index).value())); ShouldNotReachHere(); break; } // end of switch } // end of for if (_cp_patches != NULL) { // need to treat this_class specially... int this_class_index; { cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len u1* mark = cfs->current(); u2 flags = cfs->get_u2_fast(); this_class_index = cfs->get_u2_fast(); cfs->set_current(mark); // revert to mark } for (index = 1; index < length; index++) { // Index 0 is unused if (has_cp_patch_at(index)) { guarantee_property(index != this_class_index, "Illegal constant pool patch to self at %d in class file %s", index, CHECK_(nullHandle)); patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle)); } } } if (!_need_verify) { return cp; } // second verification pass - checks the strings are of the right format. // but not yet to the other entries for (index = 1; index < length; index++) { jbyte tag = cp->tag_at(index).value(); switch (tag) { case JVM_CONSTANT_UnresolvedClass: { Symbol* class_name = cp->klass_name_at(index); // check the name, even if _cp_patches will overwrite it verify_legal_class_name(class_name, CHECK_(nullHandle)); break; } case JVM_CONSTANT_NameAndType: { if (_need_verify && _major_version >= JAVA_7_VERSION) { int sig_index = cp->signature_ref_index_at(index); int name_index = cp->name_ref_index_at(index); Symbol* name = cp->symbol_at(name_index); Symbol* sig = cp->symbol_at(sig_index); if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) { verify_legal_method_signature(name, sig, CHECK_(nullHandle)); } else { verify_legal_field_signature(name, sig, CHECK_(nullHandle)); } } break; } case JVM_CONSTANT_InvokeDynamic: case JVM_CONSTANT_Fieldref: case JVM_CONSTANT_Methodref: case JVM_CONSTANT_InterfaceMethodref: { int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); // already verified to be utf8 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); // already verified to be utf8 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index); Symbol* name = cp->symbol_at(name_ref_index); Symbol* signature = cp->symbol_at(signature_ref_index); if (tag == JVM_CONSTANT_Fieldref) { verify_legal_field_name(name, CHECK_(nullHandle)); if (_need_verify && _major_version >= JAVA_7_VERSION) { // Signature is verified above, when iterating NameAndType_info. // Need only to be sure it's the right type. if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) { throwIllegalSignature( "Field", name, signature, CHECK_(nullHandle)); } } else { verify_legal_field_signature(name, signature, CHECK_(nullHandle)); } } else { verify_legal_method_name(name, CHECK_(nullHandle)); if (_need_verify && _major_version >= JAVA_7_VERSION) { // Signature is verified above, when iterating NameAndType_info. // Need only to be sure it's the right type. if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) { throwIllegalSignature( "Method", name, signature, CHECK_(nullHandle)); } } else { verify_legal_method_signature(name, signature, CHECK_(nullHandle)); } if (tag == JVM_CONSTANT_Methodref) { // 4509014: If a class method name begins with '<', it must be "". assert(name != NULL, "method name in constant pool is null"); unsigned int name_len = name->utf8_length(); assert(name_len > 0, "bad method name"); // already verified as legal name if (name->byte_at(0) == '<') { if (name != vmSymbols::object_initializer_name()) { classfile_parse_error( "Bad method name at constant pool index %u in class file %s", name_ref_index, CHECK_(nullHandle)); } } } } break; } case JVM_CONSTANT_MethodHandle: { int ref_index = cp->method_handle_index_at(index); int ref_kind = cp->method_handle_ref_kind_at(index); switch (ref_kind) { case JVM_REF_invokeVirtual: case JVM_REF_invokeStatic: case JVM_REF_invokeSpecial: case JVM_REF_newInvokeSpecial: { int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index); int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); Symbol* name = cp->symbol_at(name_ref_index); if (ref_kind == JVM_REF_newInvokeSpecial) { if (name != vmSymbols::object_initializer_name()) { classfile_parse_error( "Bad constructor name at constant pool index %u in class file %s", name_ref_index, CHECK_(nullHandle)); } } else { if (name == vmSymbols::object_initializer_name()) { classfile_parse_error( "Bad method name at constant pool index %u in class file %s", name_ref_index, CHECK_(nullHandle)); } } } break; // Other ref_kinds are already fully checked in previous pass. } break; } case JVM_CONSTANT_MethodType: { Symbol* no_name = vmSymbols::type_name(); // place holder Symbol* signature = cp->method_type_signature_at(index); verify_legal_method_signature(no_name, signature, CHECK_(nullHandle)); break; } case JVM_CONSTANT_Utf8: { assert(cp->symbol_at(index)->refcount() != 0, "count corrupted"); } } // end of switch } // end of for return cp; } void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) { BasicType patch_type = T_VOID; switch (cp->tag_at(index).value()) { case JVM_CONSTANT_UnresolvedClass : // Patching a class means pre-resolving it. // The name in the constant pool is ignored. if (java_lang_Class::is_instance(patch())) { guarantee_property(!java_lang_Class::is_primitive(patch()), "Illegal class patch at %d in class file %s", index, CHECK); cp->klass_at_put(index, java_lang_Class::as_Klass(patch())); } else { guarantee_property(java_lang_String::is_instance(patch()), "Illegal class patch at %d in class file %s", index, CHECK); Symbol* name = java_lang_String::as_symbol(patch(), CHECK); cp->unresolved_klass_at_put(index, name); } break; case JVM_CONSTANT_String : // skip this patch and don't clear it. Needs the oop array for resolved // references to be created first. return; case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim; case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim; case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim; case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim; patch_prim: { jvalue value; BasicType value_type = java_lang_boxing_object::get_value(patch(), &value); guarantee_property(value_type == patch_type, "Illegal primitive patch at %d in class file %s", index, CHECK); switch (value_type) { case T_INT: cp->int_at_put(index, value.i); break; case T_FLOAT: cp->float_at_put(index, value.f); break; case T_LONG: cp->long_at_put(index, value.j); break; case T_DOUBLE: cp->double_at_put(index, value.d); break; default: assert(false, ""); } } break; default: // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc. guarantee_property(!has_cp_patch_at(index), "Illegal unexpected patch at %d in class file %s", index, CHECK); return; } // On fall-through, mark the patch as used. clear_cp_patch_at(index); } class NameSigHash: public ResourceObj { public: Symbol* _name; // name Symbol* _sig; // signature NameSigHash* _next; // Next entry in hash table }; #define HASH_ROW_SIZE 256 unsigned int hash(Symbol* name, Symbol* sig) { unsigned int raw_hash = 0; raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2); raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize; return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE; } void initialize_hashtable(NameSigHash** table) { memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE); } // Return false if the name/sig combination is found in table. // Return true if no duplicate is found. And name/sig is added as a new entry in table. // The old format checker uses heap sort to find duplicates. // NOTE: caller should guarantee that GC doesn't happen during the life cycle // of table since we don't expect Symbol*'s to move. bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) { assert(name != NULL, "name in constant pool is NULL"); // First lookup for duplicates int index = hash(name, sig); NameSigHash* entry = table[index]; while (entry != NULL) { if (entry->_name == name && entry->_sig == sig) { return false; } entry = entry->_next; } // No duplicate is found, allocate a new entry and fill it. entry = new NameSigHash(); entry->_name = name; entry->_sig = sig; // Insert into hash table entry->_next = table[index]; table[index] = entry; return true; } Array* ClassFileParser::parse_interfaces(int length, Handle protection_domain, Symbol* class_name, bool* has_default_methods, TRAPS) { if (length == 0) { _local_interfaces = Universe::the_empty_klass_array(); } else { ClassFileStream* cfs = stream(); assert(length > 0, "only called for length>0"); _local_interfaces = MetadataFactory::new_array(_loader_data, length, NULL, CHECK_NULL); int index; for (index = 0; index < length; index++) { u2 interface_index = cfs->get_u2(CHECK_NULL); KlassHandle interf; check_property( valid_klass_reference_at(interface_index), "Interface name has bad constant pool index %u in class file %s", interface_index, CHECK_NULL); if (_cp->tag_at(interface_index).is_klass()) { interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index)); } else { Symbol* unresolved_klass = _cp->klass_name_at(interface_index); // Don't need to check legal name because it's checked when parsing constant pool. // But need to make sure it's not an array type. guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY, "Bad interface name in class file %s", CHECK_NULL); Handle class_loader(THREAD, _loader_data->class_loader()); // Call resolve_super so classcircularity is checked Klass* k = SystemDictionary::resolve_super_or_fail(class_name, unresolved_klass, class_loader, protection_domain, false, CHECK_NULL); interf = KlassHandle(THREAD, k); } if (!interf()->is_interface()) { THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL); } if (InstanceKlass::cast(interf())->has_default_methods()) { *has_default_methods = true; } _local_interfaces->at_put(index, interf()); } if (!_need_verify || length <= 1) { return _local_interfaces; } // Check if there's any duplicates in interfaces ResourceMark rm(THREAD); NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD( THREAD, NameSigHash*, HASH_ROW_SIZE); initialize_hashtable(interface_names); bool dup = false; { debug_only(No_Safepoint_Verifier nsv;) for (index = 0; index < length; index++) { Klass* k = _local_interfaces->at(index); Symbol* name = InstanceKlass::cast(k)->name(); // If no duplicates, add (name, NULL) in hashtable interface_names. if (!put_after_lookup(name, NULL, interface_names)) { dup = true; break; } } } if (dup) { classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL); } } return _local_interfaces; } void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) { // Make sure the constant pool entry is of a type appropriate to this field guarantee_property( (constantvalue_index > 0 && constantvalue_index < _cp->length()), "Bad initial value index %u in ConstantValue attribute in class file %s", constantvalue_index, CHECK); constantTag value_type = _cp->tag_at(constantvalue_index); switch ( _cp->basic_type_for_signature_at(signature_index) ) { case T_LONG: guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK); break; case T_FLOAT: guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK); break; case T_DOUBLE: guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK); break; case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT: guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK); break; case T_OBJECT: guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;") && value_type.is_string()), "Bad string initial value in class file %s", CHECK); break; default: classfile_parse_error( "Unable to set initial value %u in class file %s", constantvalue_index, CHECK); } } // Parse attributes for a field. void ClassFileParser::parse_field_attributes(u2 attributes_count, bool is_static, u2 signature_index, u2* constantvalue_index_addr, bool* is_synthetic_addr, u2* generic_signature_index_addr, ClassFileParser::FieldAnnotationCollector* parsed_annotations, TRAPS) { ClassFileStream* cfs = stream(); assert(attributes_count > 0, "length should be greater than 0"); u2 constantvalue_index = 0; u2 generic_signature_index = 0; bool is_synthetic = false; u1* runtime_visible_annotations = NULL; int runtime_visible_annotations_length = 0; u1* runtime_invisible_annotations = NULL; int runtime_invisible_annotations_length = 0; u1* runtime_visible_type_annotations = NULL; int runtime_visible_type_annotations_length = 0; u1* runtime_invisible_type_annotations = NULL; int runtime_invisible_type_annotations_length = 0; bool runtime_invisible_annotations_exists = false; bool runtime_invisible_type_annotations_exists = false; while (attributes_count--) { cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length u2 attribute_name_index = cfs->get_u2_fast(); u4 attribute_length = cfs->get_u4_fast(); check_property(valid_symbol_at(attribute_name_index), "Invalid field attribute index %u in class file %s", attribute_name_index, CHECK); Symbol* attribute_name = _cp->symbol_at(attribute_name_index); if (is_static && attribute_name == vmSymbols::tag_constant_value()) { // ignore if non-static if (constantvalue_index != 0) { classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK); } check_property( attribute_length == 2, "Invalid ConstantValue field attribute length %u in class file %s", attribute_length, CHECK); constantvalue_index = cfs->get_u2(CHECK); if (_need_verify) { verify_constantvalue(constantvalue_index, signature_index, CHECK); } } else if (attribute_name == vmSymbols::tag_synthetic()) { if (attribute_length != 0) { classfile_parse_error( "Invalid Synthetic field attribute length %u in class file %s", attribute_length, CHECK); } is_synthetic = true; } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 if (attribute_length != 0) { classfile_parse_error( "Invalid Deprecated field attribute length %u in class file %s", attribute_length, CHECK); } } else if (_major_version >= JAVA_1_5_VERSION) { if (attribute_name == vmSymbols::tag_signature()) { if (attribute_length != 2) { classfile_parse_error( "Wrong size %u for field's Signature attribute in class file %s", attribute_length, CHECK); } generic_signature_index = parse_generic_signature_attribute(CHECK); } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { if (runtime_visible_annotations != NULL) { classfile_parse_error( "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK); } runtime_visible_annotations_length = attribute_length; runtime_visible_annotations = cfs->get_u1_buffer(); assert(runtime_visible_annotations != NULL, "null visible annotations"); parse_annotations(runtime_visible_annotations, runtime_visible_annotations_length, parsed_annotations, CHECK); cfs->skip_u1(runtime_visible_annotations_length, CHECK); } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { if (runtime_invisible_annotations_exists) { classfile_parse_error( "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK); } runtime_invisible_annotations_exists = true; if (PreserveAllAnnotations) { runtime_invisible_annotations_length = attribute_length; runtime_invisible_annotations = cfs->get_u1_buffer(); assert(runtime_invisible_annotations != NULL, "null invisible annotations"); } cfs->skip_u1(attribute_length, CHECK); } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { if (runtime_visible_type_annotations != NULL) { classfile_parse_error( "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK); } runtime_visible_type_annotations_length = attribute_length; runtime_visible_type_annotations = cfs->get_u1_buffer(); assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { if (runtime_invisible_type_annotations_exists) { classfile_parse_error( "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK); } else { runtime_invisible_type_annotations_exists = true; } if (PreserveAllAnnotations) { runtime_invisible_type_annotations_length = attribute_length; runtime_invisible_type_annotations = cfs->get_u1_buffer(); assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); } cfs->skip_u1(attribute_length, CHECK); } else { cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes } } else { cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes } } *constantvalue_index_addr = constantvalue_index; *is_synthetic_addr = is_synthetic; *generic_signature_index_addr = generic_signature_index; AnnotationArray* a = assemble_annotations(runtime_visible_annotations, runtime_visible_annotations_length, runtime_invisible_annotations, runtime_invisible_annotations_length, CHECK); parsed_annotations->set_field_annotations(a); a = assemble_annotations(runtime_visible_type_annotations, runtime_visible_type_annotations_length, runtime_invisible_type_annotations, runtime_invisible_type_annotations_length, CHECK); parsed_annotations->set_field_type_annotations(a); return; } // Field allocation types. Used for computing field offsets. enum FieldAllocationType { STATIC_OOP, // Oops STATIC_BYTE, // Boolean, Byte, char STATIC_SHORT, // shorts STATIC_WORD, // ints STATIC_DOUBLE, // aligned long or double NONSTATIC_OOP, NONSTATIC_BYTE, NONSTATIC_SHORT, NONSTATIC_WORD, NONSTATIC_DOUBLE, MAX_FIELD_ALLOCATION_TYPE, BAD_ALLOCATION_TYPE = -1 }; static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = { BAD_ALLOCATION_TYPE, // 0 BAD_ALLOCATION_TYPE, // 1 BAD_ALLOCATION_TYPE, // 2 BAD_ALLOCATION_TYPE, // 3 NONSTATIC_BYTE , // T_BOOLEAN = 4, NONSTATIC_SHORT, // T_CHAR = 5, NONSTATIC_WORD, // T_FLOAT = 6, NONSTATIC_DOUBLE, // T_DOUBLE = 7, NONSTATIC_BYTE, // T_BYTE = 8, NONSTATIC_SHORT, // T_SHORT = 9, NONSTATIC_WORD, // T_INT = 10, NONSTATIC_DOUBLE, // T_LONG = 11, NONSTATIC_OOP, // T_OBJECT = 12, NONSTATIC_OOP, // T_ARRAY = 13, BAD_ALLOCATION_TYPE, // T_VOID = 14, BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, BAD_ALLOCATION_TYPE, // T_METADATA = 17, BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, BAD_ALLOCATION_TYPE, // 0 BAD_ALLOCATION_TYPE, // 1 BAD_ALLOCATION_TYPE, // 2 BAD_ALLOCATION_TYPE, // 3 STATIC_BYTE , // T_BOOLEAN = 4, STATIC_SHORT, // T_CHAR = 5, STATIC_WORD, // T_FLOAT = 6, STATIC_DOUBLE, // T_DOUBLE = 7, STATIC_BYTE, // T_BYTE = 8, STATIC_SHORT, // T_SHORT = 9, STATIC_WORD, // T_INT = 10, STATIC_DOUBLE, // T_LONG = 11, STATIC_OOP, // T_OBJECT = 12, STATIC_OOP, // T_ARRAY = 13, BAD_ALLOCATION_TYPE, // T_VOID = 14, BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, BAD_ALLOCATION_TYPE, // T_METADATA = 17, BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, }; static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) { assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values"); FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)]; assert(result != BAD_ALLOCATION_TYPE, "bad type"); return result; } class FieldAllocationCount: public ResourceObj { public: u2 count[MAX_FIELD_ALLOCATION_TYPE]; FieldAllocationCount() { for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) { count[i] = 0; } } FieldAllocationType update(bool is_static, BasicType type) { FieldAllocationType atype = basic_type_to_atype(is_static, type); // Make sure there is no overflow with injected fields. assert(count[atype] < 0xFFFF, "More than 65535 fields"); count[atype]++; return atype; } }; Array* ClassFileParser::parse_fields(Symbol* class_name, bool is_interface, FieldAllocationCount *fac, u2* java_fields_count_ptr, TRAPS) { ClassFileStream* cfs = stream(); cfs->guarantee_more(2, CHECK_NULL); // length u2 length = cfs->get_u2_fast(); *java_fields_count_ptr = length; int num_injected = 0; InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected); int total_fields = length + num_injected; // The field array starts with tuples of shorts // [access, name index, sig index, initial value index, byte offset]. // A generic signature slot only exists for field with generic // signature attribute. And the access flag is set with // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic // signature slots are at the end of the field array and after all // other fields data. // // f1: [access, name index, sig index, initial value index, low_offset, high_offset] // f2: [access, name index, sig index, initial value index, low_offset, high_offset] // ... // fn: [access, name index, sig index, initial value index, low_offset, high_offset] // [generic signature index] // [generic signature index] // ... // // Allocate a temporary resource array for field data. For each field, // a slot is reserved in the temporary array for the generic signature // index. After parsing all fields, the data are copied to a permanent // array and any unused slots will be discarded. ResourceMark rm(THREAD); u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD( THREAD, u2, total_fields * (FieldInfo::field_slots + 1)); // The generic signature slots start after all other fields' data. int generic_signature_slot = total_fields * FieldInfo::field_slots; int num_generic_signature = 0; for (int n = 0; n < length; n++) { cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count AccessFlags access_flags; jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS; verify_legal_field_modifiers(flags, is_interface, CHECK_NULL); access_flags.set_flags(flags); u2 name_index = cfs->get_u2_fast(); int cp_size = _cp->length(); check_property(valid_symbol_at(name_index), "Invalid constant pool index %u for field name in class file %s", name_index, CHECK_NULL); Symbol* name = _cp->symbol_at(name_index); verify_legal_field_name(name, CHECK_NULL); u2 signature_index = cfs->get_u2_fast(); check_property(valid_symbol_at(signature_index), "Invalid constant pool index %u for field signature in class file %s", signature_index, CHECK_NULL); Symbol* sig = _cp->symbol_at(signature_index); verify_legal_field_signature(name, sig, CHECK_NULL); u2 constantvalue_index = 0; bool is_synthetic = false; u2 generic_signature_index = 0; bool is_static = access_flags.is_static(); FieldAnnotationCollector parsed_annotations(_loader_data); u2 attributes_count = cfs->get_u2_fast(); if (attributes_count > 0) { parse_field_attributes(attributes_count, is_static, signature_index, &constantvalue_index, &is_synthetic, &generic_signature_index, &parsed_annotations, CHECK_NULL); if (parsed_annotations.field_annotations() != NULL) { if (_fields_annotations == NULL) { _fields_annotations = MetadataFactory::new_array( _loader_data, length, NULL, CHECK_NULL); } _fields_annotations->at_put(n, parsed_annotations.field_annotations()); parsed_annotations.set_field_annotations(NULL); } if (parsed_annotations.field_type_annotations() != NULL) { if (_fields_type_annotations == NULL) { _fields_type_annotations = MetadataFactory::new_array( _loader_data, length, NULL, CHECK_NULL); } _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations()); parsed_annotations.set_field_type_annotations(NULL); } if (is_synthetic) { access_flags.set_is_synthetic(); } if (generic_signature_index != 0) { access_flags.set_field_has_generic_signature(); fa[generic_signature_slot] = generic_signature_index; generic_signature_slot ++; num_generic_signature ++; } } FieldInfo* field = FieldInfo::from_field_array(fa, n); field->initialize(access_flags.as_short(), name_index, signature_index, constantvalue_index); BasicType type = _cp->basic_type_for_signature_at(signature_index); // Remember how many oops we encountered and compute allocation type FieldAllocationType atype = fac->update(is_static, type); field->set_allocation_type(atype); // After field is initialized with type, we can augment it with aux info if (parsed_annotations.has_any_annotations()) parsed_annotations.apply_to(field); } int index = length; if (num_injected != 0) { for (int n = 0; n < num_injected; n++) { // Check for duplicates if (injected[n].may_be_java) { Symbol* name = injected[n].name(); Symbol* signature = injected[n].signature(); bool duplicate = false; for (int i = 0; i < length; i++) { FieldInfo* f = FieldInfo::from_field_array(fa, i); if (name == _cp->symbol_at(f->name_index()) && signature == _cp->symbol_at(f->signature_index())) { // Symbol is desclared in Java so skip this one duplicate = true; break; } } if (duplicate) { // These will be removed from the field array at the end continue; } } // Injected field FieldInfo* field = FieldInfo::from_field_array(fa, index); field->initialize(JVM_ACC_FIELD_INTERNAL, injected[n].name_index, injected[n].signature_index, 0); BasicType type = FieldType::basic_type(injected[n].signature()); // Remember how many oops we encountered and compute allocation type FieldAllocationType atype = fac->update(false, type); field->set_allocation_type(atype); index++; } } // Now copy the fields' data from the temporary resource array. // Sometimes injected fields already exist in the Java source so // the fields array could be too long. In that case the // fields array is trimed. Also unused slots that were reserved // for generic signature indexes are discarded. Array* fields = MetadataFactory::new_array( _loader_data, index * FieldInfo::field_slots + num_generic_signature, CHECK_NULL); _fields = fields; // save in case of error { int i = 0; for (; i < index * FieldInfo::field_slots; i++) { fields->at_put(i, fa[i]); } for (int j = total_fields * FieldInfo::field_slots; j < generic_signature_slot; j++) { fields->at_put(i++, fa[j]); } assert(i == fields->length(), ""); } if (_need_verify && length > 1) { // Check duplicated fields ResourceMark rm(THREAD); NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( THREAD, NameSigHash*, HASH_ROW_SIZE); initialize_hashtable(names_and_sigs); bool dup = false; { debug_only(No_Safepoint_Verifier nsv;) for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) { Symbol* name = fs.name(); Symbol* sig = fs.signature(); // If no duplicates, add name/signature in hashtable names_and_sigs. if (!put_after_lookup(name, sig, names_and_sigs)) { dup = true; break; } } } if (dup) { classfile_parse_error("Duplicate field name&signature in class file %s", CHECK_NULL); } } return fields; } static void copy_u2_with_conversion(u2* dest, u2* src, int length) { while (length-- > 0) { *dest++ = Bytes::get_Java_u2((u1*) (src++)); } } u2* ClassFileParser::parse_exception_table(u4 code_length, u4 exception_table_length, TRAPS) { ClassFileStream* cfs = stream(); u2* exception_table_start = cfs->get_u2_buffer(); assert(exception_table_start != NULL, "null exception table"); cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index // Will check legal target after parsing code array in verifier. if (_need_verify) { for (unsigned int i = 0; i < exception_table_length; i++) { u2 start_pc = cfs->get_u2_fast(); u2 end_pc = cfs->get_u2_fast(); u2 handler_pc = cfs->get_u2_fast(); u2 catch_type_index = cfs->get_u2_fast(); guarantee_property((start_pc < end_pc) && (end_pc <= code_length), "Illegal exception table range in class file %s", CHECK_NULL); guarantee_property(handler_pc < code_length, "Illegal exception table handler in class file %s", CHECK_NULL); if (catch_type_index != 0) { guarantee_property(valid_klass_reference_at(catch_type_index), "Catch type in exception table has bad constant type in class file %s", CHECK_NULL); } } } else { cfs->skip_u2_fast(exception_table_length * 4); } return exception_table_start; } void ClassFileParser::parse_linenumber_table( u4 code_attribute_length, u4 code_length, CompressedLineNumberWriteStream** write_stream, TRAPS) { ClassFileStream* cfs = stream(); unsigned int num_entries = cfs->get_u2(CHECK); // Each entry is a u2 start_pc, and a u2 line_number unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2)); // Verify line number attribute and table length check_property( code_attribute_length == sizeof(u2) + length_in_bytes, "LineNumberTable attribute has wrong length in class file %s", CHECK); cfs->guarantee_more(length_in_bytes, CHECK); if ((*write_stream) == NULL) { if (length_in_bytes > fixed_buffer_size) { (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); } else { (*write_stream) = new CompressedLineNumberWriteStream( linenumbertable_buffer, fixed_buffer_size); } } while (num_entries-- > 0) { u2 bci = cfs->get_u2_fast(); // start_pc u2 line = cfs->get_u2_fast(); // line_number guarantee_property(bci < code_length, "Invalid pc in LineNumberTable in class file %s", CHECK); (*write_stream)->write_pair(bci, line); } } // Class file LocalVariableTable elements. class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC { public: u2 start_bci; u2 length; u2 name_cp_index; u2 descriptor_cp_index; u2 slot; }; class LVT_Hash: public CHeapObj { public: LocalVariableTableElement *_elem; // element LVT_Hash* _next; // Next entry in hash table }; unsigned int hash(LocalVariableTableElement *elem) { unsigned int raw_hash = elem->start_bci; raw_hash = elem->length + raw_hash * 37; raw_hash = elem->name_cp_index + raw_hash * 37; raw_hash = elem->slot + raw_hash * 37; return raw_hash % HASH_ROW_SIZE; } void initialize_hashtable(LVT_Hash** table) { for (int i = 0; i < HASH_ROW_SIZE; i++) { table[i] = NULL; } } void clear_hashtable(LVT_Hash** table) { for (int i = 0; i < HASH_ROW_SIZE; i++) { LVT_Hash* current = table[i]; LVT_Hash* next; while (current != NULL) { next = current->_next; current->_next = NULL; delete(current); current = next; } table[i] = NULL; } } LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) { LVT_Hash* entry = table[index]; /* * 3-tuple start_bci/length/slot has to be unique key, * so the following comparison seems to be redundant: * && elem->name_cp_index == entry->_elem->name_cp_index */ while (entry != NULL) { if (elem->start_bci == entry->_elem->start_bci && elem->length == entry->_elem->length && elem->name_cp_index == entry->_elem->name_cp_index && elem->slot == entry->_elem->slot ) { return entry; } entry = entry->_next; } return NULL; } // Return false if the local variable is found in table. // Return true if no duplicate is found. // And local variable is added as a new entry in table. bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) { // First lookup for duplicates int index = hash(elem); LVT_Hash* entry = LVT_lookup(elem, index, table); if (entry != NULL) { return false; } // No duplicate is found, allocate a new entry and fill it. if ((entry = new LVT_Hash()) == NULL) { return false; } entry->_elem = elem; // Insert into hash table entry->_next = table[index]; table[index] = entry; return true; } void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) { lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); lvt->length = Bytes::get_Java_u2((u1*) &src->length); lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); lvt->signature_cp_index = 0; lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); } // Function is used to parse both attributes: // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) u2* ClassFileParser::parse_localvariable_table(u4 code_length, u2 max_locals, u4 code_attribute_length, u2* localvariable_table_length, bool isLVTT, TRAPS) { ClassFileStream* cfs = stream(); const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; *localvariable_table_length = cfs->get_u2(CHECK_NULL); unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); // Verify local variable table attribute has right length if (_need_verify) { guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), "%s has wrong length in class file %s", tbl_name, CHECK_NULL); } u2* localvariable_table_start = cfs->get_u2_buffer(); assert(localvariable_table_start != NULL, "null local variable table"); if (!_need_verify) { cfs->skip_u2_fast(size); } else { cfs->guarantee_more(size * 2, CHECK_NULL); for(int i = 0; i < (*localvariable_table_length); i++) { u2 start_pc = cfs->get_u2_fast(); u2 length = cfs->get_u2_fast(); u2 name_index = cfs->get_u2_fast(); u2 descriptor_index = cfs->get_u2_fast(); u2 index = cfs->get_u2_fast(); // Assign to a u4 to avoid overflow u4 end_pc = (u4)start_pc + (u4)length; if (start_pc >= code_length) { classfile_parse_error( "Invalid start_pc %u in %s in class file %s", start_pc, tbl_name, CHECK_NULL); } if (end_pc > code_length) { classfile_parse_error( "Invalid length %u in %s in class file %s", length, tbl_name, CHECK_NULL); } int cp_size = _cp->length(); guarantee_property(valid_symbol_at(name_index), "Name index %u in %s has bad constant type in class file %s", name_index, tbl_name, CHECK_NULL); guarantee_property(valid_symbol_at(descriptor_index), "Signature index %u in %s has bad constant type in class file %s", descriptor_index, tbl_name, CHECK_NULL); Symbol* name = _cp->symbol_at(name_index); Symbol* sig = _cp->symbol_at(descriptor_index); verify_legal_field_name(name, CHECK_NULL); u2 extra_slot = 0; if (!isLVTT) { verify_legal_field_signature(name, sig, CHECK_NULL); // 4894874: check special cases for double and long local variables if (sig == vmSymbols::type_signature(T_DOUBLE) || sig == vmSymbols::type_signature(T_LONG)) { extra_slot = 1; } } guarantee_property((index + extra_slot) < max_locals, "Invalid index %u in %s in class file %s", index, tbl_name, CHECK_NULL); } } return localvariable_table_start; } void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index, u1* u1_array, u2* u2_array, TRAPS) { ClassFileStream* cfs = stream(); u2 index = 0; // index in the array with long/double occupying two slots u4 i1 = *u1_index; u4 i2 = *u2_index + 1; for(int i = 0; i < array_length; i++) { u1 tag = u1_array[i1++] = cfs->get_u1(CHECK); index++; if (tag == ITEM_Long || tag == ITEM_Double) { index++; } else if (tag == ITEM_Object) { u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK); guarantee_property(valid_klass_reference_at(class_index), "Bad class index %u in StackMap in class file %s", class_index, CHECK); } else if (tag == ITEM_Uninitialized) { u2 offset = u2_array[i2++] = cfs->get_u2(CHECK); guarantee_property( offset < code_length, "Bad uninitialized type offset %u in StackMap in class file %s", offset, CHECK); } else { guarantee_property( tag <= (u1)ITEM_Uninitialized, "Unknown variable type %u in StackMap in class file %s", tag, CHECK); } } u2_array[*u2_index] = index; *u1_index = i1; *u2_index = i2; } u1* ClassFileParser::parse_stackmap_table( u4 code_attribute_length, TRAPS) { if (code_attribute_length == 0) return NULL; ClassFileStream* cfs = stream(); u1* stackmap_table_start = cfs->get_u1_buffer(); assert(stackmap_table_start != NULL, "null stackmap table"); // check code_attribute_length first stream()->skip_u1(code_attribute_length, CHECK_NULL); if (!_need_verify && !DumpSharedSpaces) { return NULL; } return stackmap_table_start; } u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length, u4 method_attribute_length, TRAPS) { ClassFileStream* cfs = stream(); cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length *checked_exceptions_length = cfs->get_u2_fast(); unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); u2* checked_exceptions_start = cfs->get_u2_buffer(); assert(checked_exceptions_start != NULL, "null checked exceptions"); if (!_need_verify) { cfs->skip_u2_fast(size); } else { // Verify each value in the checked exception table u2 checked_exception; u2 len = *checked_exceptions_length; cfs->guarantee_more(2 * len, CHECK_NULL); for (int i = 0; i < len; i++) { checked_exception = cfs->get_u2_fast(); check_property( valid_klass_reference_at(checked_exception), "Exception name has bad type at constant pool %u in class file %s", checked_exception, CHECK_NULL); } } // check exceptions attribute length if (_need_verify) { guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + sizeof(u2) * size), "Exceptions attribute has wrong length in class file %s", CHECK_NULL); } return checked_exceptions_start; } void ClassFileParser::throwIllegalSignature( const char* type, Symbol* name, Symbol* sig, TRAPS) { ResourceMark rm(THREAD); Exceptions::fthrow(THREAD_AND_LOCATION, vmSymbols::java_lang_ClassFormatError(), "%s \"%s\" in class %s has illegal signature \"%s\"", type, name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); } // Skip an annotation. Return >=limit if there is any problem. int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) { // annotation := atype:u2 do(nmem:u2) {member:u2 value} // value := switch (tag:u1) { ... } index += 2; // skip atype if ((index += 2) >= limit) return limit; // read nmem int nmem = Bytes::get_Java_u2(buffer+index-2); while (--nmem >= 0 && index < limit) { index += 2; // skip member index = skip_annotation_value(buffer, limit, index); } return index; } // Skip an annotation value. Return >=limit if there is any problem. int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) { // value := switch (tag:u1) { // case B, C, I, S, Z, D, F, J, c: con:u2; // case e: e_class:u2 e_name:u2; // case s: s_con:u2; // case [: do(nval:u2) {value}; // case @: annotation; // case s: s_con:u2; // } if ((index += 1) >= limit) return limit; // read tag u1 tag = buffer[index-1]; switch (tag) { case 'B': case 'C': case 'I': case 'S': case 'Z': case 'D': case 'F': case 'J': case 'c': case 's': index += 2; // skip con or s_con break; case 'e': index += 4; // skip e_class, e_name break; case '[': { if ((index += 2) >= limit) return limit; // read nval int nval = Bytes::get_Java_u2(buffer+index-2); while (--nval >= 0 && index < limit) { index = skip_annotation_value(buffer, limit, index); } } break; case '@': index = skip_annotation(buffer, limit, index); break; default: assert(false, "annotation tag"); return limit; // bad tag byte } return index; } // Sift through annotations, looking for those significant to the VM: void ClassFileParser::parse_annotations(u1* buffer, int limit, ClassFileParser::AnnotationCollector* coll, TRAPS) { // annotations := do(nann:u2) {annotation} int index = 0; if ((index += 2) >= limit) return; // read nann int nann = Bytes::get_Java_u2(buffer+index-2); enum { // initial annotation layout atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;' count_off = 2, // u2 such as 1 (one value) member_off = 4, // utf8 such as 'value' tag_off = 6, // u1 such as 'c' (type) or 'e' (enum) e_tag_val = 'e', e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;' e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME' e_size = 11, // end of 'e' annotation c_tag_val = 'c', // payload is type c_con_off = 7, // utf8 payload, such as 'I' c_size = 9, // end of 'c' annotation s_tag_val = 's', // payload is String s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;' s_size = 9, min_size = 6 // smallest possible size (zero members) }; while ((--nann) >= 0 && (index-2 + min_size <= limit)) { int index0 = index; index = skip_annotation(buffer, limit, index); u1* abase = buffer + index0; int atype = Bytes::get_Java_u2(abase + atype_off); int count = Bytes::get_Java_u2(abase + count_off); Symbol* aname = check_symbol_at(_cp, atype); if (aname == NULL) break; // invalid annotation name Symbol* member = NULL; if (count >= 1) { int member_index = Bytes::get_Java_u2(abase + member_off); member = check_symbol_at(_cp, member_index); if (member == NULL) break; // invalid member name } // Here is where parsing particular annotations will take place. AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname); if (id == AnnotationCollector::_unknown) continue; coll->set_annotation(id); if (id == AnnotationCollector::_sun_misc_Contended) { // @Contended can optionally specify the contention group. // // Contended group defines the equivalence class over the fields: // the fields within the same contended group are not treated distinct. // The only exception is default group, which does not incur the // equivalence. Naturally, contention group for classes is meaningless. // // While the contention group is specified as String, annotation // values are already interned, and we might as well use the constant // pool index as the group tag. // u2 group_index = 0; // default contended group if (count == 1 && s_size == (index - index0) // match size && s_tag_val == *(abase + tag_off) && member == vmSymbols::value_name()) { group_index = Bytes::get_Java_u2(abase + s_con_off); if (_cp->symbol_at(group_index)->utf8_length() == 0) { group_index = 0; // default contended group } } coll->set_contended_group(group_index); } } } ClassFileParser::AnnotationCollector::ID ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data, Symbol* name) { vmSymbols::SID sid = vmSymbols::find_sid(name); // Privileged code can use all annotations. Other code silently drops some. const bool privileged = loader_data->is_the_null_class_loader_data() || loader_data->is_ext_class_loader_data() || loader_data->is_anonymous(); switch (sid) { case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature): if (_location != _in_method) break; // only allow for methods if (!privileged) break; // only allow in privileged code return _method_CallerSensitive; case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature): if (_location != _in_method) break; // only allow for methods if (!privileged) break; // only allow in privileged code return _method_ForceInline; case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature): if (_location != _in_method) break; // only allow for methods if (!privileged) break; // only allow in privileged code return _method_DontInline; case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): if (_location != _in_method) break; // only allow for methods if (!privileged) break; // only allow in privileged code return _method_LambdaForm_Compiled; case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): if (_location != _in_method) break; // only allow for methods if (!privileged) break; // only allow in privileged code return _method_LambdaForm_Hidden; case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature): if (_location != _in_field) break; // only allow for fields if (!privileged) break; // only allow in privileged code return _field_Stable; case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature): if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges return _sun_misc_Contended; default: break; } return AnnotationCollector::_unknown; } void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { if (is_contended()) f->set_contended_group(contended_group()); if (is_stable()) f->set_stable(true); } ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() { // If there's an error deallocate metadata for field annotations MetadataFactory::free_array(_loader_data, _field_annotations); MetadataFactory::free_array(_loader_data, _field_type_annotations); } void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) { if (has_annotation(_method_CallerSensitive)) m->set_caller_sensitive(true); if (has_annotation(_method_ForceInline)) m->set_force_inline(true); if (has_annotation(_method_DontInline)) m->set_dont_inline(true); if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none) m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm); if (has_annotation(_method_LambdaForm_Hidden)) m->set_hidden(true); } void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) { k->set_is_contended(is_contended()); } #define MAX_ARGS_SIZE 255 #define MAX_CODE_SIZE 65535 #define INITIAL_MAX_LVT_NUMBER 256 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. * * Rules for LVT's and LVTT's are: * - There can be any number of LVT's and LVTT's. * - If there are n LVT's, it is the same as if there was just * one LVT containing all the entries from the n LVT's. * - There may be no more than one LVT entry per local variable. * Two LVT entries are 'equal' if these fields are the same: * start_pc, length, name, slot * - There may be no more than one LVTT entry per each LVT entry. * Each LVTT entry has to match some LVT entry. * - HotSpot internal LVT keeps natural ordering of class file LVT entries. */ void ClassFileParser::copy_localvariable_table(ConstMethod* cm, int lvt_cnt, u2* localvariable_table_length, u2** localvariable_table_start, int lvtt_cnt, u2* localvariable_type_table_length, u2** localvariable_type_table_start, TRAPS) { LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE); initialize_hashtable(lvt_Hash); // To fill LocalVariableTable in Classfile_LVT_Element* cf_lvt; LocalVariableTableElement* lvt = cm->localvariable_table_start(); for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { copy_lvt_element(&cf_lvt[idx], lvt); // If no duplicates, add LVT elem in hashtable lvt_Hash. if (LVT_put_after_lookup(lvt, lvt_Hash) == false && _need_verify && _major_version >= JAVA_1_5_VERSION) { clear_hashtable(lvt_Hash); classfile_parse_error("Duplicated LocalVariableTable attribute " "entry for '%s' in class file %s", _cp->symbol_at(lvt->name_cp_index)->as_utf8(), CHECK); } } } // To merge LocalVariableTable and LocalVariableTypeTable Classfile_LVT_Element* cf_lvtt; LocalVariableTableElement lvtt_elem; for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); int index = hash(&lvtt_elem); LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash); if (entry == NULL) { if (_need_verify) { clear_hashtable(lvt_Hash); classfile_parse_error("LVTT entry for '%s' in class file %s " "does not match any LVT entry", _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), CHECK); } } else if (entry->_elem->signature_cp_index != 0 && _need_verify) { clear_hashtable(lvt_Hash); classfile_parse_error("Duplicated LocalVariableTypeTable attribute " "entry for '%s' in class file %s", _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), CHECK); } else { // to add generic signatures into LocalVariableTable entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index; } } } clear_hashtable(lvt_Hash); } void ClassFileParser::copy_method_annotations(ConstMethod* cm, u1* runtime_visible_annotations, int runtime_visible_annotations_length, u1* runtime_invisible_annotations, int runtime_invisible_annotations_length, u1* runtime_visible_parameter_annotations, int runtime_visible_parameter_annotations_length, u1* runtime_invisible_parameter_annotations, int runtime_invisible_parameter_annotations_length, u1* runtime_visible_type_annotations, int runtime_visible_type_annotations_length, u1* runtime_invisible_type_annotations, int runtime_invisible_type_annotations_length, u1* annotation_default, int annotation_default_length, TRAPS) { AnnotationArray* a; if (runtime_visible_annotations_length + runtime_invisible_annotations_length > 0) { a = assemble_annotations(runtime_visible_annotations, runtime_visible_annotations_length, runtime_invisible_annotations, runtime_invisible_annotations_length, CHECK); cm->set_method_annotations(a); } if (runtime_visible_parameter_annotations_length + runtime_invisible_parameter_annotations_length > 0) { a = assemble_annotations(runtime_visible_parameter_annotations, runtime_visible_parameter_annotations_length, runtime_invisible_parameter_annotations, runtime_invisible_parameter_annotations_length, CHECK); cm->set_parameter_annotations(a); } if (annotation_default_length > 0) { a = assemble_annotations(annotation_default, annotation_default_length, NULL, 0, CHECK); cm->set_default_annotations(a); } if (runtime_visible_type_annotations_length + runtime_invisible_type_annotations_length > 0) { a = assemble_annotations(runtime_visible_type_annotations, runtime_visible_type_annotations_length, runtime_invisible_type_annotations, runtime_invisible_type_annotations_length, CHECK); cm->set_type_annotations(a); } } // Note: the parse_method below is big and clunky because all parsing of the code and exceptions // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the // Method* to save footprint, so we only know the size of the resulting Method* when the // entire method attribute is parsed. // // The promoted_flags parameter is used to pass relevant access_flags // from the method back up to the containing klass. These flag values // are added to klass's access_flags. methodHandle ClassFileParser::parse_method(bool is_interface, AccessFlags *promoted_flags, TRAPS) { ClassFileStream* cfs = stream(); methodHandle nullHandle; ResourceMark rm(THREAD); // Parse fixed parts cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count int flags = cfs->get_u2_fast(); u2 name_index = cfs->get_u2_fast(); int cp_size = _cp->length(); check_property( valid_symbol_at(name_index), "Illegal constant pool index %u for method name in class file %s", name_index, CHECK_(nullHandle)); Symbol* name = _cp->symbol_at(name_index); verify_legal_method_name(name, CHECK_(nullHandle)); u2 signature_index = cfs->get_u2_fast(); guarantee_property( valid_symbol_at(signature_index), "Illegal constant pool index %u for method signature in class file %s", signature_index, CHECK_(nullHandle)); Symbol* signature = _cp->symbol_at(signature_index); AccessFlags access_flags; if (name == vmSymbols::class_initializer_name()) { // We ignore the other access flags for a valid class initializer. // (JVM Spec 2nd ed., chapter 4.6) if (_major_version < 51) { // backward compatibility flags = JVM_ACC_STATIC; } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) { flags &= JVM_ACC_STATIC | JVM_ACC_STRICT; } } else { verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle)); } int args_size = -1; // only used when _need_verify is true if (_need_verify) { args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + verify_legal_method_signature(name, signature, CHECK_(nullHandle)); if (args_size > MAX_ARGS_SIZE) { classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle)); } } access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); // Default values for code and exceptions attribute elements u2 max_stack = 0; u2 max_locals = 0; u4 code_length = 0; u1* code_start = 0; u2 exception_table_length = 0; u2* exception_table_start = NULL; Array* exception_handlers = Universe::the_empty_int_array(); u2 checked_exceptions_length = 0; u2* checked_exceptions_start = NULL; CompressedLineNumberWriteStream* linenumber_table = NULL; int linenumber_table_length = 0; int total_lvt_length = 0; u2 lvt_cnt = 0; u2 lvtt_cnt = 0; bool lvt_allocated = false; u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; u2* localvariable_table_length; u2** localvariable_table_start; u2* localvariable_type_table_length; u2** localvariable_type_table_start; int method_parameters_length = -1; u1* method_parameters_data = NULL; bool method_parameters_seen = false; bool parsed_code_attribute = false; bool parsed_checked_exceptions_attribute = false; bool parsed_stackmap_attribute = false; // stackmap attribute - JDK1.5 u1* stackmap_data = NULL; int stackmap_data_length = 0; u2 generic_signature_index = 0; MethodAnnotationCollector parsed_annotations; u1* runtime_visible_annotations = NULL; int runtime_visible_annotations_length = 0; u1* runtime_invisible_annotations = NULL; int runtime_invisible_annotations_length = 0; u1* runtime_visible_parameter_annotations = NULL; int runtime_visible_parameter_annotations_length = 0; u1* runtime_invisible_parameter_annotations = NULL; int runtime_invisible_parameter_annotations_length = 0; u1* runtime_visible_type_annotations = NULL; int runtime_visible_type_annotations_length = 0; u1* runtime_invisible_type_annotations = NULL; int runtime_invisible_type_annotations_length = 0; bool runtime_invisible_annotations_exists = false; bool runtime_invisible_type_annotations_exists = false; bool runtime_invisible_parameter_annotations_exists = false; u1* annotation_default = NULL; int annotation_default_length = 0; // Parse code and exceptions attribute u2 method_attributes_count = cfs->get_u2_fast(); while (method_attributes_count--) { cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length u2 method_attribute_name_index = cfs->get_u2_fast(); u4 method_attribute_length = cfs->get_u4_fast(); check_property( valid_symbol_at(method_attribute_name_index), "Invalid method attribute name index %u in class file %s", method_attribute_name_index, CHECK_(nullHandle)); Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index); if (method_attribute_name == vmSymbols::tag_code()) { // Parse Code attribute if (_need_verify) { guarantee_property( !access_flags.is_native() && !access_flags.is_abstract(), "Code attribute in native or abstract methods in class file %s", CHECK_(nullHandle)); } if (parsed_code_attribute) { classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle)); } parsed_code_attribute = true; // Stack size, locals size, and code size if (_major_version == 45 && _minor_version <= 2) { cfs->guarantee_more(4, CHECK_(nullHandle)); max_stack = cfs->get_u1_fast(); max_locals = cfs->get_u1_fast(); code_length = cfs->get_u2_fast(); } else { cfs->guarantee_more(8, CHECK_(nullHandle)); max_stack = cfs->get_u2_fast(); max_locals = cfs->get_u2_fast(); code_length = cfs->get_u4_fast(); } if (_need_verify) { guarantee_property(args_size <= max_locals, "Arguments can't fit into locals in class file %s", CHECK_(nullHandle)); guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, "Invalid method Code length %u in class file %s", code_length, CHECK_(nullHandle)); } // Code pointer code_start = cfs->get_u1_buffer(); assert(code_start != NULL, "null code start"); cfs->guarantee_more(code_length, CHECK_(nullHandle)); cfs->skip_u1_fast(code_length); // Exception handler table cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length exception_table_length = cfs->get_u2_fast(); if (exception_table_length > 0) { exception_table_start = parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle)); } // Parse additional attributes in code attribute cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count u2 code_attributes_count = cfs->get_u2_fast(); unsigned int calculated_attribute_length = 0; if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) { calculated_attribute_length = sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); } else { // max_stack, locals and length are smaller in pre-version 45.2 classes calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2); } calculated_attribute_length += code_length + sizeof(exception_table_length) + sizeof(code_attributes_count) + exception_table_length * ( sizeof(u2) + // start_pc sizeof(u2) + // end_pc sizeof(u2) + // handler_pc sizeof(u2) ); // catch_type_index while (code_attributes_count--) { cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length u2 code_attribute_name_index = cfs->get_u2_fast(); u4 code_attribute_length = cfs->get_u4_fast(); calculated_attribute_length += code_attribute_length + sizeof(code_attribute_name_index) + sizeof(code_attribute_length); check_property(valid_symbol_at(code_attribute_name_index), "Invalid code attribute name index %u in class file %s", code_attribute_name_index, CHECK_(nullHandle)); if (LoadLineNumberTables && _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { // Parse and compress line number table parse_linenumber_table(code_attribute_length, code_length, &linenumber_table, CHECK_(nullHandle)); } else if (LoadLocalVariableTables && _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { // Parse local variable table if (!lvt_allocated) { localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( THREAD, u2, INITIAL_MAX_LVT_NUMBER); localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( THREAD, u2*, INITIAL_MAX_LVT_NUMBER); localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( THREAD, u2, INITIAL_MAX_LVT_NUMBER); localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( THREAD, u2*, INITIAL_MAX_LVT_NUMBER); lvt_allocated = true; } if (lvt_cnt == max_lvt_cnt) { max_lvt_cnt <<= 1; localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); localvariable_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); } localvariable_table_start[lvt_cnt] = parse_localvariable_table(code_length, max_locals, code_attribute_length, &localvariable_table_length[lvt_cnt], false, // is not LVTT CHECK_(nullHandle)); total_lvt_length += localvariable_table_length[lvt_cnt]; lvt_cnt++; } else if (LoadLocalVariableTypeTables && _major_version >= JAVA_1_5_VERSION && _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { if (!lvt_allocated) { localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( THREAD, u2, INITIAL_MAX_LVT_NUMBER); localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( THREAD, u2*, INITIAL_MAX_LVT_NUMBER); localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( THREAD, u2, INITIAL_MAX_LVT_NUMBER); localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( THREAD, u2*, INITIAL_MAX_LVT_NUMBER); lvt_allocated = true; } // Parse local variable type table if (lvtt_cnt == max_lvtt_cnt) { max_lvtt_cnt <<= 1; localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); } localvariable_type_table_start[lvtt_cnt] = parse_localvariable_table(code_length, max_locals, code_attribute_length, &localvariable_type_table_length[lvtt_cnt], true, // is LVTT CHECK_(nullHandle)); lvtt_cnt++; } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { // Stack map is only needed by the new verifier in JDK1.5. if (parsed_stackmap_attribute) { classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle)); } stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle)); stackmap_data_length = code_attribute_length; parsed_stackmap_attribute = true; } else { // Skip unknown attributes cfs->skip_u1(code_attribute_length, CHECK_(nullHandle)); } } // check method attribute length if (_need_verify) { guarantee_property(method_attribute_length == calculated_attribute_length, "Code segment has wrong length in class file %s", CHECK_(nullHandle)); } } else if (method_attribute_name == vmSymbols::tag_exceptions()) { // Parse Exceptions attribute if (parsed_checked_exceptions_attribute) { classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle)); } parsed_checked_exceptions_attribute = true; checked_exceptions_start = parse_checked_exceptions(&checked_exceptions_length, method_attribute_length, CHECK_(nullHandle)); } else if (method_attribute_name == vmSymbols::tag_method_parameters()) { // reject multiple method parameters if (method_parameters_seen) { classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle)); } method_parameters_seen = true; method_parameters_length = cfs->get_u1_fast(); const u2 real_length = (method_parameters_length * 4u) + 1u; if (method_attribute_length != real_length) { classfile_parse_error( "Invalid MethodParameters method attribute length %u in class file", method_attribute_length, CHECK_(nullHandle)); } method_parameters_data = cfs->get_u1_buffer(); cfs->skip_u2_fast(method_parameters_length); cfs->skip_u2_fast(method_parameters_length); // ignore this attribute if it cannot be reflected if (!SystemDictionary::Parameter_klass_loaded()) method_parameters_length = -1; } else if (method_attribute_name == vmSymbols::tag_synthetic()) { if (method_attribute_length != 0) { classfile_parse_error( "Invalid Synthetic method attribute length %u in class file %s", method_attribute_length, CHECK_(nullHandle)); } // Should we check that there hasn't already been a synthetic attribute? access_flags.set_is_synthetic(); } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 if (method_attribute_length != 0) { classfile_parse_error( "Invalid Deprecated method attribute length %u in class file %s", method_attribute_length, CHECK_(nullHandle)); } } else if (_major_version >= JAVA_1_5_VERSION) { if (method_attribute_name == vmSymbols::tag_signature()) { if (method_attribute_length != 2) { classfile_parse_error( "Invalid Signature attribute length %u in class file %s", method_attribute_length, CHECK_(nullHandle)); } generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle)); } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { if (runtime_visible_annotations != NULL) { classfile_parse_error( "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle)); } runtime_visible_annotations_length = method_attribute_length; runtime_visible_annotations = cfs->get_u1_buffer(); assert(runtime_visible_annotations != NULL, "null visible annotations"); parse_annotations(runtime_visible_annotations, runtime_visible_annotations_length, &parsed_annotations, CHECK_(nullHandle)); cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle)); } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { if (runtime_invisible_annotations_exists) { classfile_parse_error( "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle)); } runtime_invisible_annotations_exists = true; if (PreserveAllAnnotations) { runtime_invisible_annotations_length = method_attribute_length; runtime_invisible_annotations = cfs->get_u1_buffer(); assert(runtime_invisible_annotations != NULL, "null invisible annotations"); } cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { if (runtime_visible_parameter_annotations != NULL) { classfile_parse_error( "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle)); } runtime_visible_parameter_annotations_length = method_attribute_length; runtime_visible_parameter_annotations = cfs->get_u1_buffer(); assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle)); } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { if (runtime_invisible_parameter_annotations_exists) { classfile_parse_error( "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle)); } runtime_invisible_parameter_annotations_exists = true; if (PreserveAllAnnotations) { runtime_invisible_parameter_annotations_length = method_attribute_length; runtime_invisible_parameter_annotations = cfs->get_u1_buffer(); assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations"); } cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { if (annotation_default != NULL) { classfile_parse_error( "Multiple AnnotationDefault attributes for method in class file %s", CHECK_(nullHandle)); } annotation_default_length = method_attribute_length; annotation_default = cfs->get_u1_buffer(); assert(annotation_default != NULL, "null annotation default"); cfs->skip_u1(annotation_default_length, CHECK_(nullHandle)); } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { if (runtime_visible_type_annotations != NULL) { classfile_parse_error( "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s", CHECK_(nullHandle)); } runtime_visible_type_annotations_length = method_attribute_length; runtime_visible_type_annotations = cfs->get_u1_buffer(); assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); // No need for the VM to parse Type annotations cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle)); } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { if (runtime_invisible_type_annotations_exists) { classfile_parse_error( "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s", CHECK_(nullHandle)); } else { runtime_invisible_type_annotations_exists = true; } if (PreserveAllAnnotations) { runtime_invisible_type_annotations_length = method_attribute_length; runtime_invisible_type_annotations = cfs->get_u1_buffer(); assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); } cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); } else { // Skip unknown attributes cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); } } else { // Skip unknown attributes cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); } } if (linenumber_table != NULL) { linenumber_table->write_terminator(); linenumber_table_length = linenumber_table->position(); } // Make sure there's at least one Code attribute in non-native/non-abstract method if (_need_verify) { guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute, "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle)); } // All sizing information for a Method* is finally available, now create it InlineTableSizes sizes( total_lvt_length, linenumber_table_length, exception_table_length, checked_exceptions_length, method_parameters_length, generic_signature_index, runtime_visible_annotations_length + runtime_invisible_annotations_length, runtime_visible_parameter_annotations_length + runtime_invisible_parameter_annotations_length, runtime_visible_type_annotations_length + runtime_invisible_type_annotations_length, annotation_default_length, 0); Method* m = Method::allocate( _loader_data, code_length, access_flags, &sizes, ConstMethod::NORMAL, CHECK_(nullHandle)); ClassLoadingService::add_class_method_size(m->size()*HeapWordSize); // Fill in information from fixed part (access_flags already set) m->set_constants(_cp); m->set_name_index(name_index); m->set_signature_index(signature_index); #ifdef CC_INTERP // hmm is there a gc issue here?? ResultTypeFinder rtf(_cp->symbol_at(signature_index)); m->set_result_index(rtf.type()); #endif if (args_size >= 0) { m->set_size_of_parameters(args_size); } else { m->compute_size_of_parameters(THREAD); } #ifdef ASSERT if (args_size >= 0) { m->compute_size_of_parameters(THREAD); assert(args_size == m->size_of_parameters(), ""); } #endif // Fill in code attribute information m->set_max_stack(max_stack); m->set_max_locals(max_locals); if (stackmap_data != NULL) { m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data, stackmap_data_length, CHECK_NULL); } // Copy byte codes m->set_code(code_start); // Copy line number table if (linenumber_table != NULL) { memcpy(m->compressed_linenumber_table(), linenumber_table->buffer(), linenumber_table_length); } // Copy exception table if (exception_table_length > 0) { int size = exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2); copy_u2_with_conversion((u2*) m->exception_table_start(), exception_table_start, size); } // Copy method parameters if (method_parameters_length > 0) { MethodParametersElement* elem = m->constMethod()->method_parameters_start(); for (int i = 0; i < method_parameters_length; i++) { elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data); method_parameters_data += 2; elem[i].flags = Bytes::get_Java_u2(method_parameters_data); method_parameters_data += 2; } } // Copy checked exceptions if (checked_exceptions_length > 0) { int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2); copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size); } // Copy class file LVT's/LVTT's into the HotSpot internal LVT. if (total_lvt_length > 0) { promoted_flags->set_has_localvariable_table(); copy_localvariable_table(m->constMethod(), lvt_cnt, localvariable_table_length, localvariable_table_start, lvtt_cnt, localvariable_type_table_length, localvariable_type_table_start, CHECK_NULL); } if (parsed_annotations.has_any_annotations()) parsed_annotations.apply_to(m); // Copy annotations copy_method_annotations(m->constMethod(), runtime_visible_annotations, runtime_visible_annotations_length, runtime_invisible_annotations, runtime_invisible_annotations_length, runtime_visible_parameter_annotations, runtime_visible_parameter_annotations_length, runtime_invisible_parameter_annotations, runtime_invisible_parameter_annotations_length, runtime_visible_type_annotations, runtime_visible_type_annotations_length, runtime_invisible_type_annotations, runtime_invisible_type_annotations_length, annotation_default, annotation_default_length, CHECK_NULL); if (name == vmSymbols::finalize_method_name() && signature == vmSymbols::void_method_signature()) { if (m->is_empty_method()) { _has_empty_finalizer = true; } else { _has_finalizer = true; } } if (name == vmSymbols::object_initializer_name() && signature == vmSymbols::void_method_signature() && m->is_vanilla_constructor()) { _has_vanilla_constructor = true; } NOT_PRODUCT(m->verify()); return m; } // The promoted_flags parameter is used to pass relevant access_flags // from the methods back up to the containing klass. These flag values // are added to klass's access_flags. Array* ClassFileParser::parse_methods(bool is_interface, AccessFlags* promoted_flags, bool* has_final_method, bool* has_default_methods, TRAPS) { ClassFileStream* cfs = stream(); cfs->guarantee_more(2, CHECK_NULL); // length u2 length = cfs->get_u2_fast(); if (length == 0) { _methods = Universe::the_empty_method_array(); } else { _methods = MetadataFactory::new_array(_loader_data, length, NULL, CHECK_NULL); HandleMark hm(THREAD); for (int index = 0; index < length; index++) { methodHandle method = parse_method(is_interface, promoted_flags, CHECK_NULL); if (method->is_final()) { *has_final_method = true; } if (is_interface && !(*has_default_methods) && !method->is_abstract() && !method->is_static() && !method->is_private()) { // default method *has_default_methods = true; } _methods->at_put(index, method()); } if (_need_verify && length > 1) { // Check duplicated methods ResourceMark rm(THREAD); NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( THREAD, NameSigHash*, HASH_ROW_SIZE); initialize_hashtable(names_and_sigs); bool dup = false; { debug_only(No_Safepoint_Verifier nsv;) for (int i = 0; i < length; i++) { Method* m = _methods->at(i); // If no duplicates, add name/signature in hashtable names_and_sigs. if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) { dup = true; break; } } } if (dup) { classfile_parse_error("Duplicate method name&signature in class file %s", CHECK_NULL); } } } return _methods; } intArray* ClassFileParser::sort_methods(Array* methods) { int length = methods->length(); // If JVMTI original method ordering or sharing is enabled we have to // remember the original class file ordering. // We temporarily use the vtable_index field in the Method* to store the // class file index, so we can read in after calling qsort. // Put the method ordering in the shared archive. if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { for (int index = 0; index < length; index++) { Method* m = methods->at(index); assert(!m->valid_vtable_index(), "vtable index should not be set"); m->set_vtable_index(index); } } // Sort method array by ascending method name (for faster lookups & vtable construction) // Note that the ordering is not alphabetical, see Symbol::fast_compare Method::sort_methods(methods); intArray* method_ordering = NULL; // If JVMTI original method ordering or sharing is enabled construct int // array remembering the original ordering if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { method_ordering = new intArray(length); for (int index = 0; index < length; index++) { Method* m = methods->at(index); int old_index = m->vtable_index(); assert(old_index >= 0 && old_index < length, "invalid method index"); method_ordering->at_put(index, old_index); m->set_vtable_index(Method::invalid_vtable_index); } } return method_ordering; } // Parse generic_signature attribute for methods and fields u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) { ClassFileStream* cfs = stream(); cfs->guarantee_more(2, CHECK_0); // generic_signature_index u2 generic_signature_index = cfs->get_u2_fast(); check_property( valid_symbol_at(generic_signature_index), "Invalid Signature attribute at constant pool index %u in class file %s", generic_signature_index, CHECK_0); return generic_signature_index; } void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) { ClassFileStream* cfs = stream(); cfs->guarantee_more(2, CHECK); // sourcefile_index u2 sourcefile_index = cfs->get_u2_fast(); check_property( valid_symbol_at(sourcefile_index), "Invalid SourceFile attribute at constant pool index %u in class file %s", sourcefile_index, CHECK); set_class_sourcefile_index(sourcefile_index); } void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) { ClassFileStream* cfs = stream(); u1* sde_buffer = cfs->get_u1_buffer(); assert(sde_buffer != NULL, "null sde buffer"); // Don't bother storing it if there is no way to retrieve it if (JvmtiExport::can_get_source_debug_extension()) { assert((length+1) > length, "Overflow checking"); u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1); for (int i = 0; i < length; i++) { sde[i] = sde_buffer[i]; } sde[length] = '\0'; set_class_sde_buffer((char*)sde, length); } // Got utf8 string, set stream position forward cfs->skip_u1(length, CHECK); } // Inner classes can be static, private or protected (classic VM does this) #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC) // Return number of classes in the inner classes attribute table u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start, bool parsed_enclosingmethod_attribute, u2 enclosing_method_class_index, u2 enclosing_method_method_index, TRAPS) { ClassFileStream* cfs = stream(); u1* current_mark = cfs->current(); u2 length = 0; if (inner_classes_attribute_start != NULL) { cfs->set_current(inner_classes_attribute_start); cfs->guarantee_more(2, CHECK_0); // length length = cfs->get_u2_fast(); } // 4-tuples of shorts of inner classes data and 2 shorts of enclosing // method data: // [inner_class_info_index, // outer_class_info_index, // inner_name_index, // inner_class_access_flags, // ... // enclosing_method_class_index, // enclosing_method_method_index] int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0); Array* inner_classes = MetadataFactory::new_array(_loader_data, size, CHECK_0); _inner_classes = inner_classes; int index = 0; int cp_size = _cp->length(); cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 for (int n = 0; n < length; n++) { // Inner class index u2 inner_class_info_index = cfs->get_u2_fast(); check_property( inner_class_info_index == 0 || valid_klass_reference_at(inner_class_info_index), "inner_class_info_index %u has bad constant type in class file %s", inner_class_info_index, CHECK_0); // Outer class index u2 outer_class_info_index = cfs->get_u2_fast(); check_property( outer_class_info_index == 0 || valid_klass_reference_at(outer_class_info_index), "outer_class_info_index %u has bad constant type in class file %s", outer_class_info_index, CHECK_0); // Inner class name u2 inner_name_index = cfs->get_u2_fast(); check_property( inner_name_index == 0 || valid_symbol_at(inner_name_index), "inner_name_index %u has bad constant type in class file %s", inner_name_index, CHECK_0); if (_need_verify) { guarantee_property(inner_class_info_index != outer_class_info_index, "Class is both outer and inner class in class file %s", CHECK_0); } // Access flags AccessFlags inner_access_flags; jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { // Set abstract bit for old class files for backward compatibility flags |= JVM_ACC_ABSTRACT; } verify_legal_class_modifiers(flags, CHECK_0); inner_access_flags.set_flags(flags); inner_classes->at_put(index++, inner_class_info_index); inner_classes->at_put(index++, outer_class_info_index); inner_classes->at_put(index++, inner_name_index); inner_classes->at_put(index++, inner_access_flags.as_short()); } // 4347400: make sure there's no duplicate entry in the classes array if (_need_verify && _major_version >= JAVA_1_5_VERSION) { for(int i = 0; i < length * 4; i += 4) { for(int j = i + 4; j < length * 4; j += 4) { guarantee_property((inner_classes->at(i) != inner_classes->at(j) || inner_classes->at(i+1) != inner_classes->at(j+1) || inner_classes->at(i+2) != inner_classes->at(j+2) || inner_classes->at(i+3) != inner_classes->at(j+3)), "Duplicate entry in InnerClasses in class file %s", CHECK_0); } } } // Set EnclosingMethod class and method indexes. if (parsed_enclosingmethod_attribute) { inner_classes->at_put(index++, enclosing_method_class_index); inner_classes->at_put(index++, enclosing_method_method_index); } assert(index == size, "wrong size"); // Restore buffer's current position. cfs->set_current(current_mark); return length; } void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) { set_class_synthetic_flag(true); } void ClassFileParser::parse_classfile_signature_attribute(TRAPS) { ClassFileStream* cfs = stream(); u2 signature_index = cfs->get_u2(CHECK); check_property( valid_symbol_at(signature_index), "Invalid constant pool index %u in Signature attribute in class file %s", signature_index, CHECK); set_class_generic_signature_index(signature_index); } void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) { ClassFileStream* cfs = stream(); u1* current_start = cfs->current(); guarantee_property(attribute_byte_length >= sizeof(u2), "Invalid BootstrapMethods attribute length %u in class file %s", attribute_byte_length, CHECK); cfs->guarantee_more(attribute_byte_length, CHECK); int attribute_array_length = cfs->get_u2_fast(); guarantee_property(_max_bootstrap_specifier_index < attribute_array_length, "Short length on BootstrapMethods in class file %s", CHECK); // The attribute contains a counted array of counted tuples of shorts, // represending bootstrap specifiers: // length*{bootstrap_method_index, argument_count*{argument_index}} int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2); // operand_count = number of shorts in attr, except for leading length // The attribute is copied into a short[] array. // The array begins with a series of short[2] pairs, one for each tuple. int index_size = (attribute_array_length * 2); Array* operands = MetadataFactory::new_array(_loader_data, index_size + operand_count, CHECK); // Eagerly assign operands so they will be deallocated with the constant // pool if there is an error. _cp->set_operands(operands); int operand_fill_index = index_size; int cp_size = _cp->length(); for (int n = 0; n < attribute_array_length; n++) { // Store a 32-bit offset into the header of the operand array. ConstantPool::operand_offset_at_put(operands, n, operand_fill_index); // Read a bootstrap specifier. cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc u2 bootstrap_method_index = cfs->get_u2_fast(); u2 argument_count = cfs->get_u2_fast(); check_property( valid_cp_range(bootstrap_method_index, cp_size) && _cp->tag_at(bootstrap_method_index).is_method_handle(), "bootstrap_method_index %u has bad constant type in class file %s", bootstrap_method_index, CHECK); guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(), "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s", CHECK); operands->at_put(operand_fill_index++, bootstrap_method_index); operands->at_put(operand_fill_index++, argument_count); cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc] for (int j = 0; j < argument_count; j++) { u2 argument_index = cfs->get_u2_fast(); check_property( valid_cp_range(argument_index, cp_size) && _cp->tag_at(argument_index).is_loadable_constant(), "argument_index %u has bad constant type in class file %s", argument_index, CHECK); operands->at_put(operand_fill_index++, argument_index); } } u1* current_end = cfs->current(); guarantee_property(current_end == current_start + attribute_byte_length, "Bad length on BootstrapMethods in class file %s", CHECK); } void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations, TRAPS) { ClassFileStream* cfs = stream(); // Set inner classes attribute to default sentinel _inner_classes = Universe::the_empty_short_array(); cfs->guarantee_more(2, CHECK); // attributes_count u2 attributes_count = cfs->get_u2_fast(); bool parsed_sourcefile_attribute = false; bool parsed_innerclasses_attribute = false; bool parsed_enclosingmethod_attribute = false; bool parsed_bootstrap_methods_attribute = false; u1* runtime_visible_annotations = NULL; int runtime_visible_annotations_length = 0; u1* runtime_invisible_annotations = NULL; int runtime_invisible_annotations_length = 0; u1* runtime_visible_type_annotations = NULL; int runtime_visible_type_annotations_length = 0; u1* runtime_invisible_type_annotations = NULL; int runtime_invisible_type_annotations_length = 0; bool runtime_invisible_type_annotations_exists = false; bool runtime_invisible_annotations_exists = false; bool parsed_source_debug_ext_annotations_exist = false; u1* inner_classes_attribute_start = NULL; u4 inner_classes_attribute_length = 0; u2 enclosing_method_class_index = 0; u2 enclosing_method_method_index = 0; // Iterate over attributes while (attributes_count--) { cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length u2 attribute_name_index = cfs->get_u2_fast(); u4 attribute_length = cfs->get_u4_fast(); check_property( valid_symbol_at(attribute_name_index), "Attribute name has bad constant pool index %u in class file %s", attribute_name_index, CHECK); Symbol* tag = _cp->symbol_at(attribute_name_index); if (tag == vmSymbols::tag_source_file()) { // Check for SourceFile tag if (_need_verify) { guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); } if (parsed_sourcefile_attribute) { classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); } else { parsed_sourcefile_attribute = true; } parse_classfile_sourcefile_attribute(CHECK); } else if (tag == vmSymbols::tag_source_debug_extension()) { // Check for SourceDebugExtension tag if (parsed_source_debug_ext_annotations_exist) { classfile_parse_error( "Multiple SourceDebugExtension attributes in class file %s", CHECK); } parsed_source_debug_ext_annotations_exist = true; parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK); } else if (tag == vmSymbols::tag_inner_classes()) { // Check for InnerClasses tag if (parsed_innerclasses_attribute) { classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); } else { parsed_innerclasses_attribute = true; } inner_classes_attribute_start = cfs->get_u1_buffer(); inner_classes_attribute_length = attribute_length; cfs->skip_u1(inner_classes_attribute_length, CHECK); } else if (tag == vmSymbols::tag_synthetic()) { // Check for Synthetic tag // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec if (attribute_length != 0) { classfile_parse_error( "Invalid Synthetic classfile attribute length %u in class file %s", attribute_length, CHECK); } parse_classfile_synthetic_attribute(CHECK); } else if (tag == vmSymbols::tag_deprecated()) { // Check for Deprecatd tag - 4276120 if (attribute_length != 0) { classfile_parse_error( "Invalid Deprecated classfile attribute length %u in class file %s", attribute_length, CHECK); } } else if (_major_version >= JAVA_1_5_VERSION) { if (tag == vmSymbols::tag_signature()) { if (attribute_length != 2) { classfile_parse_error( "Wrong Signature attribute length %u in class file %s", attribute_length, CHECK); } parse_classfile_signature_attribute(CHECK); } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { if (runtime_visible_annotations != NULL) { classfile_parse_error( "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK); } runtime_visible_annotations_length = attribute_length; runtime_visible_annotations = cfs->get_u1_buffer(); assert(runtime_visible_annotations != NULL, "null visible annotations"); parse_annotations(runtime_visible_annotations, runtime_visible_annotations_length, parsed_annotations, CHECK); cfs->skip_u1(runtime_visible_annotations_length, CHECK); } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) { if (runtime_invisible_annotations_exists) { classfile_parse_error( "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK); } runtime_invisible_annotations_exists = true; if (PreserveAllAnnotations) { runtime_invisible_annotations_length = attribute_length; runtime_invisible_annotations = cfs->get_u1_buffer(); assert(runtime_invisible_annotations != NULL, "null invisible annotations"); } cfs->skip_u1(attribute_length, CHECK); } else if (tag == vmSymbols::tag_enclosing_method()) { if (parsed_enclosingmethod_attribute) { classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); } else { parsed_enclosingmethod_attribute = true; } guarantee_property(attribute_length == 4, "Wrong EnclosingMethod attribute length %u in class file %s", attribute_length, CHECK); cfs->guarantee_more(4, CHECK); // class_index, method_index enclosing_method_class_index = cfs->get_u2_fast(); enclosing_method_method_index = cfs->get_u2_fast(); if (enclosing_method_class_index == 0) { classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); } // Validate the constant pool indices and types check_property(valid_klass_reference_at(enclosing_method_class_index), "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); if (enclosing_method_method_index != 0 && (!_cp->is_within_bounds(enclosing_method_method_index) || !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) { classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); } } else if (tag == vmSymbols::tag_bootstrap_methods() && _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { if (parsed_bootstrap_methods_attribute) classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK); parsed_bootstrap_methods_attribute = true; parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK); } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) { if (runtime_visible_type_annotations != NULL) { classfile_parse_error( "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK); } runtime_visible_type_annotations_length = attribute_length; runtime_visible_type_annotations = cfs->get_u1_buffer(); assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); // No need for the VM to parse Type annotations cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) { if (runtime_invisible_type_annotations_exists) { classfile_parse_error( "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK); } else { runtime_invisible_type_annotations_exists = true; } if (PreserveAllAnnotations) { runtime_invisible_type_annotations_length = attribute_length; runtime_invisible_type_annotations = cfs->get_u1_buffer(); assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); } cfs->skip_u1(attribute_length, CHECK); } else { // Unknown attribute cfs->skip_u1(attribute_length, CHECK); } } else { // Unknown attribute cfs->skip_u1(attribute_length, CHECK); } } _annotations = assemble_annotations(runtime_visible_annotations, runtime_visible_annotations_length, runtime_invisible_annotations, runtime_invisible_annotations_length, CHECK); _type_annotations = assemble_annotations(runtime_visible_type_annotations, runtime_visible_type_annotations_length, runtime_invisible_type_annotations, runtime_invisible_type_annotations_length, CHECK); if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) { u2 num_of_classes = parse_classfile_inner_classes_attribute( inner_classes_attribute_start, parsed_innerclasses_attribute, enclosing_method_class_index, enclosing_method_method_index, CHECK); if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) { guarantee_property( inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, "Wrong InnerClasses attribute length in class file %s", CHECK); } } if (_max_bootstrap_specifier_index >= 0) { guarantee_property(parsed_bootstrap_methods_attribute, "Missing BootstrapMethods attribute in class file %s", CHECK); } } void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) { if (_synthetic_flag) k->set_is_synthetic(); if (_sourcefile_index != 0) { k->set_source_file_name_index(_sourcefile_index); } if (_generic_signature_index != 0) { k->set_generic_signature_index(_generic_signature_index); } if (_sde_buffer != NULL) { k->set_source_debug_extension(_sde_buffer, _sde_length); } } // Transfer ownership of metadata allocated to the InstanceKlass. void ClassFileParser::apply_parsed_class_metadata( instanceKlassHandle this_klass, int java_fields_count, TRAPS) { // Assign annotations if needed if (_annotations != NULL || _type_annotations != NULL || _fields_annotations != NULL || _fields_type_annotations != NULL) { Annotations* annotations = Annotations::allocate(_loader_data, CHECK); annotations->set_class_annotations(_annotations); annotations->set_class_type_annotations(_type_annotations); annotations->set_fields_annotations(_fields_annotations); annotations->set_fields_type_annotations(_fields_type_annotations); this_klass->set_annotations(annotations); } _cp->set_pool_holder(this_klass()); this_klass->set_constants(_cp); this_klass->set_fields(_fields, java_fields_count); this_klass->set_methods(_methods); this_klass->set_inner_classes(_inner_classes); this_klass->set_local_interfaces(_local_interfaces); this_klass->set_transitive_interfaces(_transitive_interfaces); // Clear out these fields so they don't get deallocated by the destructor clear_class_metadata(); } AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations, int runtime_visible_annotations_length, u1* runtime_invisible_annotations, int runtime_invisible_annotations_length, TRAPS) { AnnotationArray* annotations = NULL; if (runtime_visible_annotations != NULL || runtime_invisible_annotations != NULL) { annotations = MetadataFactory::new_array(_loader_data, runtime_visible_annotations_length + runtime_invisible_annotations_length, CHECK_(annotations)); if (runtime_visible_annotations != NULL) { for (int i = 0; i < runtime_visible_annotations_length; i++) { annotations->at_put(i, runtime_visible_annotations[i]); } } if (runtime_invisible_annotations != NULL) { for (int i = 0; i < runtime_invisible_annotations_length; i++) { int append = runtime_visible_annotations_length+i; annotations->at_put(append, runtime_invisible_annotations[i]); } } } return annotations; } instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index, TRAPS) { instanceKlassHandle super_klass; if (super_class_index == 0) { check_property(_class_name == vmSymbols::java_lang_Object(), "Invalid superclass index %u in class file %s", super_class_index, CHECK_NULL); } else { check_property(valid_klass_reference_at(super_class_index), "Invalid superclass index %u in class file %s", super_class_index, CHECK_NULL); // The class name should be legal because it is checked when parsing constant pool. // However, make sure it is not an array type. bool is_array = false; if (_cp->tag_at(super_class_index).is_klass()) { super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index)); if (_need_verify) is_array = super_klass->oop_is_array(); } else if (_need_verify) { is_array = (_cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY); } if (_need_verify) { guarantee_property(!is_array, "Bad superclass name in class file %s", CHECK_NULL); } } return super_klass; } // Values needed for oopmap and InstanceKlass creation class FieldLayoutInfo : public StackObj { public: int* nonstatic_oop_offsets; unsigned int* nonstatic_oop_counts; unsigned int nonstatic_oop_map_count; unsigned int total_oop_map_count; int instance_size; int nonstatic_field_size; int static_field_size; bool has_nonstatic_fields; }; // Layout fields and fill in FieldLayoutInfo. Could use more refactoring! void ClassFileParser::layout_fields(Handle class_loader, FieldAllocationCount* fac, ClassAnnotationCollector* parsed_annotations, FieldLayoutInfo* info, TRAPS) { // Field size and offset computation int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size(); int next_static_oop_offset; int next_static_double_offset; int next_static_word_offset; int next_static_short_offset; int next_static_byte_offset; int next_nonstatic_oop_offset; int next_nonstatic_double_offset; int next_nonstatic_word_offset; int next_nonstatic_short_offset; int next_nonstatic_byte_offset; int first_nonstatic_oop_offset; int next_nonstatic_field_offset; int next_nonstatic_padded_offset; // Count the contended fields by type. // // We ignore static fields, because @Contended is not supported for them. // The layout code below will also ignore the static fields. int nonstatic_contended_count = 0; FieldAllocationCount fac_contended; for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); if (fs.is_contended()) { fac_contended.count[atype]++; if (!fs.access_flags().is_static()) { nonstatic_contended_count++; } } } // Calculate the starting byte offsets next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields(); next_static_double_offset = next_static_oop_offset + ((fac->count[STATIC_OOP]) * heapOopSize); if ( fac->count[STATIC_DOUBLE] && (Universe::field_type_should_be_aligned(T_DOUBLE) || Universe::field_type_should_be_aligned(T_LONG)) ) { next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong); } next_static_word_offset = next_static_double_offset + ((fac->count[STATIC_DOUBLE]) * BytesPerLong); next_static_short_offset = next_static_word_offset + ((fac->count[STATIC_WORD]) * BytesPerInt); next_static_byte_offset = next_static_short_offset + ((fac->count[STATIC_SHORT]) * BytesPerShort); int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size * heapOopSize; next_nonstatic_field_offset = nonstatic_fields_start; bool is_contended_class = parsed_annotations->is_contended(); // Class is contended, pad before all the fields if (is_contended_class) { next_nonstatic_field_offset += ContendedPaddingWidth; } // Compute the non-contended fields count. // The packing code below relies on these counts to determine if some field // can be squeezed into the alignment gap. Contended fields are obviously // exempt from that. unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE]; unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD]; unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT]; unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE]; unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP]; // Total non-static fields count, including every contended field unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] + fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] + fac->count[NONSTATIC_OOP]; bool super_has_nonstatic_fields = (_super_klass() != NULL && _super_klass->has_nonstatic_fields()); bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0); // Prepare list of oops for oop map generation. // // "offset" and "count" lists are describing the set of contiguous oop // regions. offset[i] is the start of the i-th region, which then has // count[i] oops following. Before we know how many regions are required, // we pessimistically allocate the maps to fit all the oops into the // distinct regions. // // TODO: We add +1 to always allocate non-zero resource arrays; we need // to figure out if we still need to do this. int* nonstatic_oop_offsets; unsigned int* nonstatic_oop_counts; unsigned int nonstatic_oop_map_count = 0; unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1; nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD( THREAD, int, max_nonstatic_oop_maps); nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD( THREAD, unsigned int, max_nonstatic_oop_maps); first_nonstatic_oop_offset = 0; // will be set for first oop field bool compact_fields = CompactFields; int allocation_style = FieldsAllocationStyle; if( allocation_style < 0 || allocation_style > 2 ) { // Out of range? assert(false, "0 <= FieldsAllocationStyle <= 2"); allocation_style = 1; // Optimistic } // The next classes have predefined hard-coded fields offsets // (see in JavaClasses::compute_hard_coded_offsets()). // Use default fields allocation order for them. if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() && (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() || _class_name == vmSymbols::java_lang_Class() || _class_name == vmSymbols::java_lang_ClassLoader() || _class_name == vmSymbols::java_lang_ref_Reference() || _class_name == vmSymbols::java_lang_ref_SoftReference() || _class_name == vmSymbols::java_lang_StackTraceElement() || _class_name == vmSymbols::java_lang_String() || _class_name == vmSymbols::java_lang_Throwable() || _class_name == vmSymbols::java_lang_Boolean() || _class_name == vmSymbols::java_lang_Character() || _class_name == vmSymbols::java_lang_Float() || _class_name == vmSymbols::java_lang_Double() || _class_name == vmSymbols::java_lang_Byte() || _class_name == vmSymbols::java_lang_Short() || _class_name == vmSymbols::java_lang_Integer() || _class_name == vmSymbols::java_lang_Long())) { allocation_style = 0; // Allocate oops first compact_fields = false; // Don't compact fields } // Rearrange fields for a given allocation style if( allocation_style == 0 ) { // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields next_nonstatic_oop_offset = next_nonstatic_field_offset; next_nonstatic_double_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); } else if( allocation_style == 1 ) { // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields next_nonstatic_double_offset = next_nonstatic_field_offset; } else if( allocation_style == 2 ) { // Fields allocation: oops fields in super and sub classes are together. if( nonstatic_field_size > 0 && _super_klass() != NULL && _super_klass->nonstatic_oop_map_size() > 0 ) { unsigned int map_count = _super_klass->nonstatic_oop_map_count(); OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps(); OopMapBlock* last_map = first_map + map_count - 1; int next_offset = last_map->offset() + (last_map->count() * heapOopSize); if (next_offset == next_nonstatic_field_offset) { allocation_style = 0; // allocate oops first next_nonstatic_oop_offset = next_nonstatic_field_offset; next_nonstatic_double_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); } } if( allocation_style == 2 ) { allocation_style = 1; // allocate oops last next_nonstatic_double_offset = next_nonstatic_field_offset; } } else { ShouldNotReachHere(); } int nonstatic_oop_space_count = 0; int nonstatic_word_space_count = 0; int nonstatic_short_space_count = 0; int nonstatic_byte_space_count = 0; int nonstatic_oop_space_offset; int nonstatic_word_space_offset; int nonstatic_short_space_offset; int nonstatic_byte_space_offset; // Try to squeeze some of the fields into the gaps due to // long/double alignment. if( nonstatic_double_count > 0 ) { int offset = next_nonstatic_double_offset; next_nonstatic_double_offset = align_size_up(offset, BytesPerLong); if( compact_fields && offset != next_nonstatic_double_offset ) { // Allocate available fields into the gap before double field. int length = next_nonstatic_double_offset - offset; assert(length == BytesPerInt, ""); nonstatic_word_space_offset = offset; if( nonstatic_word_count > 0 ) { nonstatic_word_count -= 1; nonstatic_word_space_count = 1; // Only one will fit length -= BytesPerInt; offset += BytesPerInt; } nonstatic_short_space_offset = offset; while( length >= BytesPerShort && nonstatic_short_count > 0 ) { nonstatic_short_count -= 1; nonstatic_short_space_count += 1; length -= BytesPerShort; offset += BytesPerShort; } nonstatic_byte_space_offset = offset; while( length > 0 && nonstatic_byte_count > 0 ) { nonstatic_byte_count -= 1; nonstatic_byte_space_count += 1; length -= 1; } // Allocate oop field in the gap if there are no other fields for that. nonstatic_oop_space_offset = offset; if( length >= heapOopSize && nonstatic_oop_count > 0 && allocation_style != 0 ) { // when oop fields not first nonstatic_oop_count -= 1; nonstatic_oop_space_count = 1; // Only one will fit length -= heapOopSize; offset += heapOopSize; } } } next_nonstatic_word_offset = next_nonstatic_double_offset + (nonstatic_double_count * BytesPerLong); next_nonstatic_short_offset = next_nonstatic_word_offset + (nonstatic_word_count * BytesPerInt); next_nonstatic_byte_offset = next_nonstatic_short_offset + (nonstatic_short_count * BytesPerShort); next_nonstatic_padded_offset = next_nonstatic_byte_offset + nonstatic_byte_count; // let oops jump before padding with this allocation style if( allocation_style == 1 ) { next_nonstatic_oop_offset = next_nonstatic_padded_offset; if( nonstatic_oop_count > 0 ) { next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize); } next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); } // Iterate over fields again and compute correct offsets. // The field allocation type was temporarily stored in the offset slot. // oop fields are located before non-oop fields (static and non-static). for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { // skip already laid out fields if (fs.is_offset_set()) continue; // contended instance fields are handled below if (fs.is_contended() && !fs.access_flags().is_static()) continue; int real_offset; FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); // pack the rest of the fields switch (atype) { case STATIC_OOP: real_offset = next_static_oop_offset; next_static_oop_offset += heapOopSize; break; case STATIC_BYTE: real_offset = next_static_byte_offset; next_static_byte_offset += 1; break; case STATIC_SHORT: real_offset = next_static_short_offset; next_static_short_offset += BytesPerShort; break; case STATIC_WORD: real_offset = next_static_word_offset; next_static_word_offset += BytesPerInt; break; case STATIC_DOUBLE: real_offset = next_static_double_offset; next_static_double_offset += BytesPerLong; break; case NONSTATIC_OOP: if( nonstatic_oop_space_count > 0 ) { real_offset = nonstatic_oop_space_offset; nonstatic_oop_space_offset += heapOopSize; nonstatic_oop_space_count -= 1; } else { real_offset = next_nonstatic_oop_offset; next_nonstatic_oop_offset += heapOopSize; } // Update oop maps if( nonstatic_oop_map_count > 0 && nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == real_offset - int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * heapOopSize ) { // Extend current oop map assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; } else { // Create new oop map assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; nonstatic_oop_counts [nonstatic_oop_map_count] = 1; nonstatic_oop_map_count += 1; if( first_nonstatic_oop_offset == 0 ) { // Undefined first_nonstatic_oop_offset = real_offset; } } break; case NONSTATIC_BYTE: if( nonstatic_byte_space_count > 0 ) { real_offset = nonstatic_byte_space_offset; nonstatic_byte_space_offset += 1; nonstatic_byte_space_count -= 1; } else { real_offset = next_nonstatic_byte_offset; next_nonstatic_byte_offset += 1; } break; case NONSTATIC_SHORT: if( nonstatic_short_space_count > 0 ) { real_offset = nonstatic_short_space_offset; nonstatic_short_space_offset += BytesPerShort; nonstatic_short_space_count -= 1; } else { real_offset = next_nonstatic_short_offset; next_nonstatic_short_offset += BytesPerShort; } break; case NONSTATIC_WORD: if( nonstatic_word_space_count > 0 ) { real_offset = nonstatic_word_space_offset; nonstatic_word_space_offset += BytesPerInt; nonstatic_word_space_count -= 1; } else { real_offset = next_nonstatic_word_offset; next_nonstatic_word_offset += BytesPerInt; } break; case NONSTATIC_DOUBLE: real_offset = next_nonstatic_double_offset; next_nonstatic_double_offset += BytesPerLong; break; default: ShouldNotReachHere(); } fs.set_offset(real_offset); } // Handle the contended cases. // // Each contended field should not intersect the cache line with another contended field. // In the absence of alignment information, we end up with pessimistically separating // the fields with full-width padding. // // Additionally, this should not break alignment for the fields, so we round the alignment up // for each field. if (nonstatic_contended_count > 0) { // if there is at least one contended field, we need to have pre-padding for them next_nonstatic_padded_offset += ContendedPaddingWidth; // collect all contended groups BitMap bm(_cp->size()); for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { // skip already laid out fields if (fs.is_offset_set()) continue; if (fs.is_contended()) { bm.set_bit(fs.contended_group()); } } int current_group = -1; while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) { for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { // skip already laid out fields if (fs.is_offset_set()) continue; // skip non-contended fields and fields from different group if (!fs.is_contended() || (fs.contended_group() != current_group)) continue; // handle statics below if (fs.access_flags().is_static()) continue; int real_offset; FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); switch (atype) { case NONSTATIC_BYTE: next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1); real_offset = next_nonstatic_padded_offset; next_nonstatic_padded_offset += 1; break; case NONSTATIC_SHORT: next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort); real_offset = next_nonstatic_padded_offset; next_nonstatic_padded_offset += BytesPerShort; break; case NONSTATIC_WORD: next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt); real_offset = next_nonstatic_padded_offset; next_nonstatic_padded_offset += BytesPerInt; break; case NONSTATIC_DOUBLE: next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong); real_offset = next_nonstatic_padded_offset; next_nonstatic_padded_offset += BytesPerLong; break; case NONSTATIC_OOP: next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize); real_offset = next_nonstatic_padded_offset; next_nonstatic_padded_offset += heapOopSize; // Create new oop map assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; nonstatic_oop_counts [nonstatic_oop_map_count] = 1; nonstatic_oop_map_count += 1; if( first_nonstatic_oop_offset == 0 ) { // Undefined first_nonstatic_oop_offset = real_offset; } break; default: ShouldNotReachHere(); } if (fs.contended_group() == 0) { // Contended group defines the equivalence class over the fields: // the fields within the same contended group are not inter-padded. // The only exception is default group, which does not incur the // equivalence, and so requires intra-padding. next_nonstatic_padded_offset += ContendedPaddingWidth; } fs.set_offset(real_offset); } // for // Start laying out the next group. // Note that this will effectively pad the last group in the back; // this is expected to alleviate memory contention effects for // subclass fields and/or adjacent object. // If this was the default group, the padding is already in place. if (current_group != 0) { next_nonstatic_padded_offset += ContendedPaddingWidth; } } // handle static fields } // Entire class is contended, pad in the back. // This helps to alleviate memory contention effects for subclass fields // and/or adjacent object. if (is_contended_class) { next_nonstatic_padded_offset += ContendedPaddingWidth; } int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset; int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize); int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize); int static_fields_end = align_size_up(next_static_byte_offset, wordSize); int static_field_size = (static_fields_end - InstanceMirrorKlass::offset_of_static_fields()) / wordSize; nonstatic_field_size = nonstatic_field_size + (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize; int instance_size = align_object_size(instance_end / wordSize); assert(instance_size == align_object_size(align_size_up( (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value"); // Invariant: nonstatic_field end/start should only change if there are // nonstatic fields in the class, or if the class is contended. We compare // against the non-aligned value, so that end alignment will not fail the // assert without actually having the fields. assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) || is_contended_class || (nonstatic_fields_count > 0), "double-check nonstatic start/end"); // Number of non-static oop map blocks allocated at end of klass. const unsigned int total_oop_map_count = compute_oop_map_count(_super_klass, nonstatic_oop_map_count, first_nonstatic_oop_offset); #ifndef PRODUCT if (PrintFieldLayout) { print_field_layout(_class_name, _fields, _cp, instance_size, nonstatic_fields_start, nonstatic_fields_end, static_fields_end); } #endif // Pass back information needed for InstanceKlass creation info->nonstatic_oop_offsets = nonstatic_oop_offsets; info->nonstatic_oop_counts = nonstatic_oop_counts; info->nonstatic_oop_map_count = nonstatic_oop_map_count; info->total_oop_map_count = total_oop_map_count; info->instance_size = instance_size; info->static_field_size = static_field_size; info->nonstatic_field_size = nonstatic_field_size; info->has_nonstatic_fields = has_nonstatic_fields; } instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name, ClassLoaderData* loader_data, Handle protection_domain, KlassHandle host_klass, GrowableArray* cp_patches, TempNewSymbol& parsed_name, bool verify, TRAPS) { // When a retransformable agent is attached, JVMTI caches the // class bytes that existed before the first retransformation. // If RedefineClasses() was used before the retransformable // agent attached, then the cached class bytes may not be the // original class bytes. JvmtiCachedClassFileData *cached_class_file = NULL; Handle class_loader(THREAD, loader_data->class_loader()); bool has_default_methods = false; ResourceMark rm(THREAD); ClassFileStream* cfs = stream(); // Timing assert(THREAD->is_Java_thread(), "must be a JavaThread"); JavaThread* jt = (JavaThread*) THREAD; PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(), ClassLoader::perf_class_parse_selftime(), NULL, jt->get_thread_stat()->perf_recursion_counts_addr(), jt->get_thread_stat()->perf_timers_addr(), PerfClassTraceTime::PARSE_CLASS); init_parsed_class_attributes(loader_data); if (JvmtiExport::should_post_class_file_load_hook()) { // Get the cached class file bytes (if any) from the class that // is being redefined or retransformed. We use jvmti_thread_state() // instead of JvmtiThreadState::state_for(jt) so we don't allocate // a JvmtiThreadState any earlier than necessary. This will help // avoid the bug described by 7126851. JvmtiThreadState *state = jt->jvmti_thread_state(); if (state != NULL) { KlassHandle *h_class_being_redefined = state->get_class_being_redefined(); if (h_class_being_redefined != NULL) { instanceKlassHandle ikh_class_being_redefined = instanceKlassHandle(THREAD, (*h_class_being_redefined)()); cached_class_file = ikh_class_being_redefined->get_cached_class_file(); } } unsigned char* ptr = cfs->buffer(); unsigned char* end_ptr = cfs->buffer() + cfs->length(); JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain, &ptr, &end_ptr, &cached_class_file); if (ptr != cfs->buffer()) { // JVMTI agent has modified class file data. // Set new class file stream using JVMTI agent modified // class file data. cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source()); set_stream(cfs); } } _host_klass = host_klass; _cp_patches = cp_patches; instanceKlassHandle nullHandle; // Figure out whether we can skip format checking (matching classic VM behavior) if (DumpSharedSpaces) { // verify == true means it's a 'remote' class (i.e., non-boot class) // Verification decision is based on BytecodeVerificationRemote flag // for those classes. _need_verify = (verify) ? BytecodeVerificationRemote : BytecodeVerificationLocal; } else { _need_verify = Verifier::should_verify_for(class_loader(), verify); } // Set the verify flag in stream cfs->set_verify(_need_verify); // Save the class file name for easier error message printing. _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name(); cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor // Magic value u4 magic = cfs->get_u4_fast(); guarantee_property(magic == JAVA_CLASSFILE_MAGIC, "Incompatible magic value %u in class file %s", magic, CHECK_(nullHandle)); // Version numbers u2 minor_version = cfs->get_u2_fast(); u2 major_version = cfs->get_u2_fast(); if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) { ResourceMark rm; warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s", major_version, minor_version, name->as_C_string()); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_UnsupportedClassVersionError(), "Unsupported major.minor version for dump time %u.%u", major_version, minor_version); } // Check version numbers - we check this even with verifier off if (!is_supported_version(major_version, minor_version)) { if (name == NULL) { Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_UnsupportedClassVersionError(), "Unsupported class file version %u.%u, " "this version of the Java Runtime only recognizes class file versions up to %u.%u", major_version, minor_version, JAVA_MAX_SUPPORTED_VERSION, JAVA_MAX_SUPPORTED_MINOR_VERSION); } else { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_UnsupportedClassVersionError(), "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), " "this version of the Java Runtime only recognizes class file versions up to %u.%u", name->as_C_string(), major_version, minor_version, JAVA_MAX_SUPPORTED_VERSION, JAVA_MAX_SUPPORTED_MINOR_VERSION); } return nullHandle; } _major_version = major_version; _minor_version = minor_version; // Check if verification needs to be relaxed for this class file // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) _relax_verify = Verifier::relax_verify_for(class_loader()); // Constant pool constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle)); int cp_size = cp->length(); cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len // Access flags AccessFlags access_flags; jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { // Set abstract bit for old class files for backward compatibility flags |= JVM_ACC_ABSTRACT; } verify_legal_class_modifiers(flags, CHECK_(nullHandle)); access_flags.set_flags(flags); // This class and superclass u2 this_class_index = cfs->get_u2_fast(); check_property( valid_cp_range(this_class_index, cp_size) && cp->tag_at(this_class_index).is_unresolved_klass(), "Invalid this class index %u in constant pool in class file %s", this_class_index, CHECK_(nullHandle)); Symbol* class_name = cp->klass_name_at(this_class_index); assert(class_name != NULL, "class_name can't be null"); // It's important to set parsed_name *before* resolving the super class. // (it's used for cleanup by the caller if parsing fails) parsed_name = class_name; // parsed_name is returned and can be used if there's an error, so add to // its reference count. Caller will decrement the refcount. parsed_name->increment_refcount(); // Update _class_name which could be null previously to be class_name _class_name = class_name; // Don't need to check whether this class name is legal or not. // It has been checked when constant pool is parsed. // However, make sure it is not an array type. if (_need_verify) { guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY, "Bad class name in class file %s", CHECK_(nullHandle)); } Klass* preserve_this_klass; // for storing result across HandleMark // release all handles when parsing is done { HandleMark hm(THREAD); // Checks if name in class file matches requested name if (name != NULL && class_name != name) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_NoClassDefFoundError(), "%s (wrong name: %s)", name->as_C_string(), class_name->as_C_string() ); return nullHandle; } if (TraceClassLoadingPreorder) { tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName"); if (cfs->source() != NULL) tty->print(" from %s", cfs->source()); tty->print_cr("]"); } #if INCLUDE_CDS if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) { // Only dump the classes that can be stored into CDS archive if (SystemDictionaryShared::is_sharing_possible(loader_data)) { if (name != NULL) { ResourceMark rm(THREAD); classlist_file->print_cr("%s", name->as_C_string()); classlist_file->flush(); } } } #endif u2 super_class_index = cfs->get_u2_fast(); instanceKlassHandle super_klass = parse_super_class(super_class_index, CHECK_NULL); // Interfaces u2 itfs_len = cfs->get_u2_fast(); Array* local_interfaces = parse_interfaces(itfs_len, protection_domain, _class_name, &has_default_methods, CHECK_(nullHandle)); u2 java_fields_count = 0; // Fields (offsets are filled in later) FieldAllocationCount fac; Array* fields = parse_fields(class_name, access_flags.is_interface(), &fac, &java_fields_count, CHECK_(nullHandle)); // Methods bool has_final_method = false; AccessFlags promoted_flags; promoted_flags.set_flags(0); Array* methods = parse_methods(access_flags.is_interface(), &promoted_flags, &has_final_method, &has_default_methods, CHECK_(nullHandle)); // Additional attributes ClassAnnotationCollector parsed_annotations; parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle)); // Make sure this is the end of class file stream guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle)); // We check super class after class file is parsed and format is checked if (super_class_index > 0 && super_klass.is_null()) { Symbol* sk = cp->klass_name_at(super_class_index); if (access_flags.is_interface()) { // Before attempting to resolve the superclass, check for class format // errors not checked yet. guarantee_property(sk == vmSymbols::java_lang_Object(), "Interfaces must have java.lang.Object as superclass in class file %s", CHECK_(nullHandle)); } Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk, class_loader, protection_domain, true, CHECK_(nullHandle)); KlassHandle kh (THREAD, k); super_klass = instanceKlassHandle(THREAD, kh()); } if (super_klass.not_null()) { if (super_klass->has_default_methods()) { has_default_methods = true; } if (super_klass->is_interface()) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_IncompatibleClassChangeError(), "class %s has interface %s as super class", class_name->as_klass_external_name(), super_klass->external_name() ); return nullHandle; } // Make sure super class is not final if (super_klass->is_final()) { THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle); } } // save super klass for error handling. _super_klass = super_klass; // Compute the transitive list of all unique interfaces implemented by this class _transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle)); // sort methods intArray* method_ordering = sort_methods(methods); // promote flags from parse_methods() to the klass' flags access_flags.add_promoted_flags(promoted_flags.as_int()); // Size of Java vtable (in words) int vtable_size = 0; int itable_size = 0; int num_miranda_methods = 0; GrowableArray all_mirandas(20); klassVtable::compute_vtable_size_and_num_mirandas( &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods, access_flags, class_loader, class_name, local_interfaces, CHECK_(nullHandle)); // Size of Java itable (in words) itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces); FieldLayoutInfo info; layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL); int total_oop_map_size2 = InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count); // Compute reference type ReferenceType rt; if (super_klass() == NULL) { rt = REF_NONE; } else { rt = super_klass->reference_type(); } // We can now create the basic Klass* for this klass _klass = InstanceKlass::allocate_instance_klass(loader_data, vtable_size, itable_size, info.static_field_size, total_oop_map_size2, rt, access_flags, name, super_klass(), !host_klass.is_null(), CHECK_(nullHandle)); instanceKlassHandle this_klass (THREAD, _klass); assert(this_klass->static_field_size() == info.static_field_size, "sanity"); assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count, "sanity"); // Fill in information already parsed this_klass->set_should_verify_class(verify); jint lh = Klass::instance_layout_helper(info.instance_size, false); this_klass->set_layout_helper(lh); assert(this_klass->oop_is_instance(), "layout is correct"); assert(this_klass->size_helper() == info.instance_size, "correct size_helper"); // Not yet: supers are done below to support the new subtype-checking fields //this_klass->set_super(super_klass()); this_klass->set_class_loader_data(loader_data); this_klass->set_nonstatic_field_size(info.nonstatic_field_size); this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields); this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]); apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL); if (has_final_method) { this_klass->set_has_final_method(); } this_klass->copy_method_ordering(method_ordering, CHECK_NULL); // The InstanceKlass::_methods_jmethod_ids cache // is managed on the assumption that the initial cache // size is equal to the number of methods in the class. If // that changes, then InstanceKlass::idnum_can_increment() // has to be changed accordingly. this_klass->set_initial_method_idnum(methods->length()); this_klass->set_name(cp->klass_name_at(this_class_index)); if (is_anonymous()) // I am well known to myself cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve this_klass->set_minor_version(minor_version); this_klass->set_major_version(major_version); this_klass->set_has_default_methods(has_default_methods); if (!host_klass.is_null()) { assert (this_klass->is_anonymous(), "should be the same"); this_klass->set_host_klass(host_klass()); } // Set up Method*::intrinsic_id as soon as we know the names of methods. // (We used to do this lazily, but now we query it in Rewriter, // which is eagerly done for every method, so we might as well do it now, // when everything is fresh in memory.) if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) { for (int j = 0; j < methods->length(); j++) { methods->at(j)->init_intrinsic_id(); } } if (cached_class_file != NULL) { // JVMTI: we have an InstanceKlass now, tell it about the cached bytes this_klass->set_cached_class_file(cached_class_file); } // Fill in field values obtained by parse_classfile_attributes if (parsed_annotations.has_any_annotations()) parsed_annotations.apply_to(this_klass); apply_parsed_class_attributes(this_klass); // Miranda methods if ((num_miranda_methods > 0) || // if this class introduced new miranda methods or (super_klass.not_null() && (super_klass->has_miranda_methods())) // super class exists and this class inherited miranda methods ) { this_klass->set_has_miranda_methods(); // then set a flag } // Fill in information needed to compute superclasses. this_klass->initialize_supers(super_klass(), CHECK_(nullHandle)); // Initialize itable offset tables klassItable::setup_itable_offset_table(this_klass); // Compute transitive closure of interfaces this class implements // Do final class setup fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts); // Fill in has_finalizer, has_vanilla_constructor, and layout_helper set_precomputed_flags(this_klass); // reinitialize modifiers, using the InnerClasses attribute int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle)); this_klass->set_modifier_flags(computed_modifiers); // check if this class can access its super class check_super_class_access(this_klass, CHECK_(nullHandle)); // check if this class can access its superinterfaces check_super_interface_access(this_klass, CHECK_(nullHandle)); // check if this class overrides any final method check_final_method_override(this_klass, CHECK_(nullHandle)); // check that if this class is an interface then it doesn't have static methods if (this_klass->is_interface()) { /* An interface in a JAVA 8 classfile can be static */ if (_major_version < JAVA_8_VERSION) { check_illegal_static_method(this_klass, CHECK_(nullHandle)); } } // Allocate mirror and initialize static fields java_lang_Class::create_mirror(this_klass, class_loader, protection_domain, CHECK_(nullHandle)); // Generate any default methods - default methods are interface methods // that have a default implementation. This is new with Lambda project. if (has_default_methods ) { DefaultMethods::generate_default_methods( this_klass(), &all_mirandas, CHECK_(nullHandle)); } // Update the loader_data graph. record_defined_class_dependencies(this_klass, CHECK_NULL); ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()), false /* not shared class */); if (TraceClassLoading) { ResourceMark rm; // print in a single call to reduce interleaving of output if (cfs->source() != NULL) { tty->print("[Loaded %s from %s]\n", this_klass->external_name(), cfs->source()); } else if (class_loader.is_null()) { Klass* caller = THREAD->is_Java_thread() ? ((JavaThread*)THREAD)->security_get_caller_class(1) : NULL; // caller can be NULL, for example, during a JVMTI VM_Init hook if (caller != NULL) { tty->print("[Loaded %s by instance of %s]\n", this_klass->external_name(), InstanceKlass::cast(caller)->external_name()); } else { tty->print("[Loaded %s]\n", this_klass->external_name()); } } else { tty->print("[Loaded %s from %s]\n", this_klass->external_name(), InstanceKlass::cast(class_loader->klass())->external_name()); } } if (TraceClassResolution) { ResourceMark rm; // print out the superclass. const char * from = this_klass()->external_name(); if (this_klass->java_super() != NULL) { tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name()); } // print out each of the interface classes referred to by this class. Array* local_interfaces = this_klass->local_interfaces(); if (local_interfaces != NULL) { int length = local_interfaces->length(); for (int i = 0; i < length; i++) { Klass* k = local_interfaces->at(i); InstanceKlass* to_class = InstanceKlass::cast(k); const char * to = to_class->external_name(); tty->print("RESOLVE %s %s (interface)\n", from, to); } } } // preserve result across HandleMark preserve_this_klass = this_klass(); } // Create new handle outside HandleMark (might be needed for // Extended Class Redefinition) instanceKlassHandle this_klass (THREAD, preserve_this_klass); debug_only(this_klass->verify();) // Clear class if no error has occurred so destructor doesn't deallocate it _klass = NULL; return this_klass; } // Destructor to clean up if there's an error ClassFileParser::~ClassFileParser() { MetadataFactory::free_metadata(_loader_data, _cp); MetadataFactory::free_array(_loader_data, _fields); // Free methods InstanceKlass::deallocate_methods(_loader_data, _methods); // beware of the Universe::empty_blah_array!! if (_inner_classes != Universe::the_empty_short_array()) { MetadataFactory::free_array(_loader_data, _inner_classes); } // Free interfaces InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(), _local_interfaces, _transitive_interfaces); MetadataFactory::free_array(_loader_data, _annotations); MetadataFactory::free_array(_loader_data, _type_annotations); Annotations::free_contents(_loader_data, _fields_annotations); Annotations::free_contents(_loader_data, _fields_type_annotations); clear_class_metadata(); // deallocate the klass if already created. Don't directly deallocate, but add // to the deallocate list so that the klass is removed from the CLD::_klasses list // at a safepoint. if (_klass != NULL) { _loader_data->add_to_deallocate_list(_klass); } _klass = NULL; } void ClassFileParser::print_field_layout(Symbol* name, Array* fields, constantPoolHandle cp, int instance_size, int instance_fields_start, int instance_fields_end, int static_fields_end) { tty->print("%s: field layout\n", name->as_klass_external_name()); tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---"); for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { if (!fs.access_flags().is_static()) { tty->print(" @%3d \"%s\" %s\n", fs.offset(), fs.name()->as_klass_external_name(), fs.signature()->as_klass_external_name()); } } tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---"); tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---"); tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---"); for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { if (fs.access_flags().is_static()) { tty->print(" @%3d \"%s\" %s\n", fs.offset(), fs.name()->as_klass_external_name(), fs.signature()->as_klass_external_name()); } } tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---"); tty->print("\n"); } unsigned int ClassFileParser::compute_oop_map_count(instanceKlassHandle super, unsigned int nonstatic_oop_map_count, int first_nonstatic_oop_offset) { unsigned int map_count = super.is_null() ? 0 : super->nonstatic_oop_map_count(); if (nonstatic_oop_map_count > 0) { // We have oops to add to map if (map_count == 0) { map_count = nonstatic_oop_map_count; } else { // Check whether we should add a new map block or whether the last one can // be extended OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps(); OopMapBlock* const last_map = first_map + map_count - 1; int next_offset = last_map->offset() + last_map->count() * heapOopSize; if (next_offset == first_nonstatic_oop_offset) { // There is no gap bettwen superklass's last oop field and first // local oop field, merge maps. nonstatic_oop_map_count -= 1; } else { // Superklass didn't end with a oop field, add extra maps assert(next_offset < first_nonstatic_oop_offset, "just checking"); } map_count += nonstatic_oop_map_count; } } return map_count; } void ClassFileParser::fill_oop_maps(instanceKlassHandle k, unsigned int nonstatic_oop_map_count, int* nonstatic_oop_offsets, unsigned int* nonstatic_oop_counts) { OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps(); const InstanceKlass* const super = k->superklass(); const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0; if (super_count > 0) { // Copy maps from superklass OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps(); for (unsigned int i = 0; i < super_count; ++i) { *this_oop_map++ = *super_oop_map++; } } if (nonstatic_oop_map_count > 0) { if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) { // The counts differ because there is no gap between superklass's last oop // field and the first local oop field. Extend the last oop map copied // from the superklass instead of creating new one. nonstatic_oop_map_count--; nonstatic_oop_offsets++; this_oop_map--; this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++); this_oop_map++; } // Add new map blocks, fill them while (nonstatic_oop_map_count-- > 0) { this_oop_map->set_offset(*nonstatic_oop_offsets++); this_oop_map->set_count(*nonstatic_oop_counts++); this_oop_map++; } assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() == this_oop_map, "sanity"); } } void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) { Klass* super = k->super(); // Check if this klass has an empty finalize method (i.e. one with return bytecode only), // in which case we don't have to register objects as finalizable if (!_has_empty_finalizer) { if (_has_finalizer || (super != NULL && super->has_finalizer())) { k->set_has_finalizer(); } } #ifdef ASSERT bool f = false; Method* m = k->lookup_method(vmSymbols::finalize_method_name(), vmSymbols::void_method_signature()); if (m != NULL && !m->is_empty_method()) { f = true; } // Spec doesn't prevent agent from redefinition of empty finalizer. // Despite the fact that it's generally bad idea and redefined finalizer // will not work as expected we shouldn't abort vm in this case if (!k->has_redefined_this_or_super()) { assert(f == k->has_finalizer(), "inconsistent has_finalizer"); } #endif // Check if this klass supports the java.lang.Cloneable interface if (SystemDictionary::Cloneable_klass_loaded()) { if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) { k->set_is_cloneable(); } } // Check if this klass has a vanilla default constructor if (super == NULL) { // java.lang.Object has empty default constructor k->set_has_vanilla_constructor(); } else { if (super->has_vanilla_constructor() && _has_vanilla_constructor) { k->set_has_vanilla_constructor(); } #ifdef ASSERT bool v = false; if (super->has_vanilla_constructor()) { Method* constructor = k->find_method(vmSymbols::object_initializer_name( ), vmSymbols::void_method_signature()); if (constructor != NULL && constructor->is_vanilla_constructor()) { v = true; } } assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); #endif } // If it cannot be fast-path allocated, set a bit in the layout helper. // See documentation of InstanceKlass::can_be_fastpath_allocated(). assert(k->size_helper() > 0, "layout_helper is initialized"); if ((!RegisterFinalizersAtInit && k->has_finalizer()) || k->is_abstract() || k->is_interface() || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL) || k->size_helper() >= FastAllocateSizeLimit) { // Forbid fast-path allocation. jint lh = Klass::instance_layout_helper(k->size_helper(), true); k->set_layout_helper(lh); } } // Attach super classes and interface classes to class loader data void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) { ClassLoaderData * defining_loader_data = defined_klass->class_loader_data(); if (defining_loader_data->is_the_null_class_loader_data()) { // Dependencies to null class loader data are implicit. return; } else { // add super class dependency Klass* super = defined_klass->super(); if (super != NULL) { defining_loader_data->record_dependency(super, CHECK); } // add super interface dependencies Array* local_interfaces = defined_klass->local_interfaces(); if (local_interfaces != NULL) { int length = local_interfaces->length(); for (int i = 0; i < length; i++) { defining_loader_data->record_dependency(local_interfaces->at(i), CHECK); } } } } // utility methods for appending an array with check for duplicates void append_interfaces(GrowableArray* result, Array* ifs) { // iterate over new interfaces for (int i = 0; i < ifs->length(); i++) { Klass* e = ifs->at(i); assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking"); // add new interface result->append_if_missing(e); } } Array* ClassFileParser::compute_transitive_interfaces( instanceKlassHandle super, Array* local_ifs, TRAPS) { // Compute maximum size for transitive interfaces int max_transitive_size = 0; int super_size = 0; // Add superclass transitive interfaces size if (super.not_null()) { super_size = super->transitive_interfaces()->length(); max_transitive_size += super_size; } // Add local interfaces' super interfaces int local_size = local_ifs->length(); for (int i = 0; i < local_size; i++) { Klass* l = local_ifs->at(i); max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length(); } // Finally add local interfaces max_transitive_size += local_size; // Construct array if (max_transitive_size == 0) { // no interfaces, use canonicalized array return Universe::the_empty_klass_array(); } else if (max_transitive_size == super_size) { // no new local interfaces added, share superklass' transitive interface array return super->transitive_interfaces(); } else if (max_transitive_size == local_size) { // only local interfaces added, share local interface array return local_ifs; } else { ResourceMark rm; GrowableArray* result = new GrowableArray(max_transitive_size); // Copy down from superclass if (super.not_null()) { append_interfaces(result, super->transitive_interfaces()); } // Copy down from local interfaces' superinterfaces for (int i = 0; i < local_ifs->length(); i++) { Klass* l = local_ifs->at(i); append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces()); } // Finally add local interfaces append_interfaces(result, local_ifs); // length will be less than the max_transitive_size if duplicates were removed int length = result->length(); assert(length <= max_transitive_size, "just checking"); Array* new_result = MetadataFactory::new_array(_loader_data, length, CHECK_NULL); for (int i = 0; i < length; i++) { Klass* e = result->at(i); assert(e != NULL, "just checking"); new_result->at_put(i, e); } return new_result; } } void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) { Klass* super = this_klass->super(); if ((super != NULL) && (!Reflection::verify_class_access(this_klass(), super, false))) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_IllegalAccessError(), "class %s cannot access its superclass %s", this_klass->external_name(), InstanceKlass::cast(super)->external_name() ); return; } } void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) { Array* local_interfaces = this_klass->local_interfaces(); int lng = local_interfaces->length(); for (int i = lng - 1; i >= 0; i--) { Klass* k = local_interfaces->at(i); assert (k != NULL && k->is_interface(), "invalid interface"); if (!Reflection::verify_class_access(this_klass(), k, false)) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_IllegalAccessError(), "class %s cannot access its superinterface %s", this_klass->external_name(), InstanceKlass::cast(k)->external_name() ); return; } } } void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) { Array* methods = this_klass->methods(); int num_methods = methods->length(); // go thru each method and check if it overrides a final method for (int index = 0; index < num_methods; index++) { Method* m = methods->at(index); // skip private, static, and methods if ((!m->is_private() && !m->is_static()) && (m->name() != vmSymbols::object_initializer_name())) { Symbol* name = m->name(); Symbol* signature = m->signature(); Klass* k = this_klass->super(); Method* super_m = NULL; while (k != NULL) { // skip supers that don't have final methods. if (k->has_final_method()) { // lookup a matching method in the super class hierarchy super_m = InstanceKlass::cast(k)->lookup_method(name, signature); if (super_m == NULL) { break; // didn't find any match; get out } if (super_m->is_final() && !super_m->is_static() && // matching method in super is final, and not static (Reflection::verify_field_access(this_klass(), super_m->method_holder(), super_m->method_holder(), super_m->access_flags(), false)) // this class can access super final method and therefore override ) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_VerifyError(), "class %s overrides final method %s.%s%s", this_klass->external_name(), super_m->method_holder()->external_name(), name->as_C_string(), signature->as_C_string() ); return; } // continue to look from super_m's holder's super. k = super_m->method_holder()->super(); continue; } k = k->super(); } } } } // assumes that this_klass is an interface void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) { assert(this_klass->is_interface(), "not an interface"); Array* methods = this_klass->methods(); int num_methods = methods->length(); for (int index = 0; index < num_methods; index++) { Method* m = methods->at(index); // if m is static and not the init method, throw a verify error if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_VerifyError(), "Illegal static method %s in interface %s", m->name()->as_C_string(), this_klass->external_name() ); return; } } } // utility methods for format checking void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) { if (!_need_verify) { return; } const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; const bool is_final = (flags & JVM_ACC_FINAL) != 0; const bool is_super = (flags & JVM_ACC_SUPER) != 0; const bool is_enum = (flags & JVM_ACC_ENUM) != 0; const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; if ((is_abstract && is_final) || (is_interface && !is_abstract) || (is_interface && major_gte_15 && (is_super || is_enum)) || (!is_interface && major_gte_15 && is_annotation)) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_ClassFormatError(), "Illegal class modifiers in class %s: 0x%X", _class_name->as_C_string(), flags ); return; } } bool ClassFileParser::has_illegal_visibility(jint flags) { const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; return ((is_public && is_protected) || (is_public && is_private) || (is_protected && is_private)); } bool ClassFileParser::is_supported_version(u2 major, u2 minor) { u2 max_version = JAVA_MAX_SUPPORTED_VERSION; return (major >= JAVA_MIN_SUPPORTED_VERSION) && (major <= max_version) && ((major != max_version) || (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION)); } void ClassFileParser::verify_legal_field_modifiers( jint flags, bool is_interface, TRAPS) { if (!_need_verify) { return; } const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; const bool is_static = (flags & JVM_ACC_STATIC) != 0; const bool is_final = (flags & JVM_ACC_FINAL) != 0; const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; const bool is_enum = (flags & JVM_ACC_ENUM) != 0; const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; bool is_illegal = false; if (is_interface) { if (!is_public || !is_static || !is_final || is_private || is_protected || is_volatile || is_transient || (major_gte_15 && is_enum)) { is_illegal = true; } } else { // not interface if (has_illegal_visibility(flags) || (is_final && is_volatile)) { is_illegal = true; } } if (is_illegal) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_ClassFormatError(), "Illegal field modifiers in class %s: 0x%X", _class_name->as_C_string(), flags); return; } } void ClassFileParser::verify_legal_method_modifiers( jint flags, bool is_interface, Symbol* name, TRAPS) { if (!_need_verify) { return; } const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; const bool is_static = (flags & JVM_ACC_STATIC) != 0; const bool is_final = (flags & JVM_ACC_FINAL) != 0; const bool is_native = (flags & JVM_ACC_NATIVE) != 0; const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; const bool is_strict = (flags & JVM_ACC_STRICT) != 0; const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; const bool major_gte_8 = _major_version >= JAVA_8_VERSION; const bool is_initializer = (name == vmSymbols::object_initializer_name()); bool is_illegal = false; if (is_interface) { if (major_gte_8) { // Class file version is JAVA_8_VERSION or later Methods of // interfaces may set any of the flags except ACC_PROTECTED, // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set. if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */ (is_native || is_protected || is_final || is_synchronized) || // If a specific method of a class or interface has its // ACC_ABSTRACT flag set, it must not have any of its // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC, // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as // those flags are illegal irrespective of ACC_ABSTRACT being set or not. (is_abstract && (is_private || is_static || is_strict))) { is_illegal = true; } } else if (major_gte_15) { // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION) if (!is_public || is_static || is_final || is_synchronized || is_native || !is_abstract || is_strict) { is_illegal = true; } } else { // Class file version is pre-JAVA_1_5_VERSION if (!is_public || is_static || is_final || is_native || !is_abstract) { is_illegal = true; } } } else { // not interface if (is_initializer) { if (is_static || is_final || is_synchronized || is_native || is_abstract || (major_gte_15 && is_bridge)) { is_illegal = true; } } else { // not initializer if (is_abstract) { if ((is_final || is_native || is_private || is_static || (major_gte_15 && (is_synchronized || is_strict)))) { is_illegal = true; } } if (has_illegal_visibility(flags)) { is_illegal = true; } } } if (is_illegal) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_ClassFormatError(), "Method %s in class %s has illegal modifiers: 0x%X", name->as_C_string(), _class_name->as_C_string(), flags); return; } } void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) { assert(_need_verify, "only called when _need_verify is true"); int i = 0; int count = length >> 2; for (int k=0; k= 128 (highest bit 1) for v == 0 or v >= 128. unsigned char res = b0 | b0 - 1 | b1 | b1 - 1 | b2 | b2 - 1 | b3 | b3 - 1; if (res >= 128) break; i += 4; } for(; i < length; i++) { unsigned short c; // no embedded zeros guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK); if(buffer[i] < 128) { continue; } if ((i + 5) < length) { // see if it's legal supplementary character if (UTF8::is_supplementary_character(&buffer[i])) { c = UTF8::get_supplementary_character(&buffer[i]); i += 5; continue; } } switch (buffer[i] >> 4) { default: break; case 0x8: case 0x9: case 0xA: case 0xB: case 0xF: classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); case 0xC: case 0xD: // 110xxxxx 10xxxxxx c = (buffer[i] & 0x1F) << 6; i++; if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) { c += buffer[i] & 0x3F; if (_major_version <= 47 || c == 0 || c >= 0x80) { // for classes with major > 47, c must a null or a character in its shortest form break; } } classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx c = (buffer[i] & 0xF) << 12; i += 2; if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) { c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F); if (_major_version <= 47 || c >= 0x800) { // for classes with major > 47, c must be in its shortest form break; } } classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); } // end of switch } // end of for } // Checks if name is a legal class name. void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) { if (!_need_verify || _relax_verify) { return; } char buf[fixed_buffer_size]; char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); unsigned int length = name->utf8_length(); bool legal = false; if (length > 0) { char* p; if (bytes[0] == JVM_SIGNATURE_ARRAY) { p = skip_over_field_signature(bytes, false, length, CHECK); legal = (p != NULL) && ((p - bytes) == (int)length); } else if (_major_version < JAVA_1_5_VERSION) { if (bytes[0] != '<') { p = skip_over_field_name(bytes, true, length); legal = (p != NULL) && ((p - bytes) == (int)length); } } else { // 4900761: relax the constraints based on JSR202 spec // Class names may be drawn from the entire Unicode character set. // Identifiers between '/' must be unqualified names. // The utf8 string has been verified when parsing cpool entries. legal = verify_unqualified_name(bytes, length, LegalClass); } } if (!legal) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_ClassFormatError(), "Illegal class name \"%s\" in class file %s", bytes, _class_name->as_C_string() ); return; } } // Checks if name is a legal field name. void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) { if (!_need_verify || _relax_verify) { return; } char buf[fixed_buffer_size]; char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); unsigned int length = name->utf8_length(); bool legal = false; if (length > 0) { if (_major_version < JAVA_1_5_VERSION) { if (bytes[0] != '<') { char* p = skip_over_field_name(bytes, false, length); legal = (p != NULL) && ((p - bytes) == (int)length); } } else { // 4881221: relax the constraints based on JSR202 spec legal = verify_unqualified_name(bytes, length, LegalField); } } if (!legal) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_ClassFormatError(), "Illegal field name \"%s\" in class %s", bytes, _class_name->as_C_string() ); return; } } // Checks if name is a legal method name. void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) { if (!_need_verify || _relax_verify) { return; } assert(name != NULL, "method name is null"); char buf[fixed_buffer_size]; char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); unsigned int length = name->utf8_length(); bool legal = false; if (length > 0) { if (bytes[0] == '<') { if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { legal = true; } } else if (_major_version < JAVA_1_5_VERSION) { char* p; p = skip_over_field_name(bytes, false, length); legal = (p != NULL) && ((p - bytes) == (int)length); } else { // 4881221: relax the constraints based on JSR202 spec legal = verify_unqualified_name(bytes, length, LegalMethod); } } if (!legal) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_ClassFormatError(), "Illegal method name \"%s\" in class %s", bytes, _class_name->as_C_string() ); return; } } // Checks if signature is a legal field signature. void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) { if (!_need_verify) { return; } char buf[fixed_buffer_size]; char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); unsigned int length = signature->utf8_length(); char* p = skip_over_field_signature(bytes, false, length, CHECK); if (p == NULL || (p - bytes) != (int)length) { throwIllegalSignature("Field", name, signature, CHECK); } } // Checks if signature is a legal method signature. // Returns number of parameters int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) { if (!_need_verify) { // make sure caller's args_size will be less than 0 even for non-static // method so it will be recomputed in compute_size_of_parameters(). return -2; } unsigned int args_size = 0; char buf[fixed_buffer_size]; char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); unsigned int length = signature->utf8_length(); char* nextp; // The first character must be a '(' if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { length--; // Skip over legal field signatures nextp = skip_over_field_signature(p, false, length, CHECK_0); while ((length > 0) && (nextp != NULL)) { args_size++; if (p[0] == 'J' || p[0] == 'D') { args_size++; } length -= nextp - p; p = nextp; nextp = skip_over_field_signature(p, false, length, CHECK_0); } // The first non-signature thing better be a ')' if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { length--; if (name->utf8_length() > 0 && name->byte_at(0) == '<') { // All internal methods must return void if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { return args_size; } } else { // Now we better just have a return value nextp = skip_over_field_signature(p, true, length, CHECK_0); if (nextp && ((int)length == (nextp - p))) { return args_size; } } } } // Report error throwIllegalSignature("Method", name, signature, CHECK_0); return 0; } // Unqualified names may not contain the characters '.', ';', '[', or '/'. // Method names also may not contain the characters '<' or '>', unless // or . Note that method names may not be or in this // method. Because these names have been checked as special cases before // calling this method in verify_legal_method_name. bool ClassFileParser::verify_unqualified_name( char* name, unsigned int length, int type) { jchar ch; for (char* p = name; p != name + length; ) { ch = *p; if (ch < 128) { p++; if (ch == '.' || ch == ';' || ch == '[' ) { return false; // do not permit '.', ';', or '[' } if (type != LegalClass && ch == '/') { return false; // do not permit '/' unless it's class name } if (type == LegalMethod && (ch == '<' || ch == '>')) { return false; // do not permit '<' or '>' in method names } } else { char* tmp_p = UTF8::next(p, &ch); p = tmp_p; } } return true; } // Take pointer to a string. Skip over the longest part of the string that could // be taken as a fieldname. Allow '/' if slash_ok is true. // Return a pointer to just past the fieldname. // Return NULL if no fieldname at all was found, or in the case of slash_ok // being true, we saw consecutive slashes (meaning we were looking for a // qualified path but found something that was badly-formed). char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) { char* p; jchar ch; jboolean last_is_slash = false; jboolean not_first_ch = false; for (p = name; p != name + length; not_first_ch = true) { char* old_p = p; ch = *p; if (ch < 128) { p++; // quick check for ascii if ((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') || (ch == '_' || ch == '$') || (not_first_ch && ch >= '0' && ch <= '9')) { last_is_slash = false; continue; } if (slash_ok && ch == '/') { if (last_is_slash) { return NULL; // Don't permit consecutive slashes } last_is_slash = true; continue; } } else { jint unicode_ch; char* tmp_p = UTF8::next_character(p, &unicode_ch); p = tmp_p; last_is_slash = false; // Check if ch is Java identifier start or is Java identifier part // 4672820: call java.lang.Character methods directly without generating separate tables. EXCEPTION_MARK; instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass()); // return value JavaValue result(T_BOOLEAN); // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart JavaCallArguments args; args.push_int(unicode_ch); // public static boolean isJavaIdentifierStart(char ch); JavaCalls::call_static(&result, klass, vmSymbols::isJavaIdentifierStart_name(), vmSymbols::int_bool_signature(), &args, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return 0; } if (result.get_jboolean()) { continue; } if (not_first_ch) { // public static boolean isJavaIdentifierPart(char ch); JavaCalls::call_static(&result, klass, vmSymbols::isJavaIdentifierPart_name(), vmSymbols::int_bool_signature(), &args, THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return 0; } if (result.get_jboolean()) { continue; } } } return (not_first_ch) ? old_p : NULL; } return (not_first_ch) ? p : NULL; } // Take pointer to a string. Skip over the longest part of the string that could // be taken as a field signature. Allow "void" if void_ok. // Return a pointer to just past the signature. // Return NULL if no legal signature is found. char* ClassFileParser::skip_over_field_signature(char* signature, bool void_ok, unsigned int length, TRAPS) { unsigned int array_dim = 0; while (length > 0) { switch (signature[0]) { case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } case JVM_SIGNATURE_BOOLEAN: case JVM_SIGNATURE_BYTE: case JVM_SIGNATURE_CHAR: case JVM_SIGNATURE_SHORT: case JVM_SIGNATURE_INT: case JVM_SIGNATURE_FLOAT: case JVM_SIGNATURE_LONG: case JVM_SIGNATURE_DOUBLE: return signature + 1; case JVM_SIGNATURE_CLASS: { if (_major_version < JAVA_1_5_VERSION) { // Skip over the class name if one is there char* p = skip_over_field_name(signature + 1, true, --length); // The next character better be a semicolon if (p && (p - signature) > 1 && p[0] == ';') { return p + 1; } } else { // 4900761: For class version > 48, any unicode is allowed in class name. length--; signature++; while (length > 0 && signature[0] != ';') { if (signature[0] == '.') { classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0); } length--; signature++; } if (signature[0] == ';') { return signature + 1; } } return NULL; } case JVM_SIGNATURE_ARRAY: array_dim++; if (array_dim > 255) { // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0); } // The rest of what's there better be a legal signature signature++; length--; void_ok = false; break; default: return NULL; } } return NULL; }