diff -r c5955f4b7c84 -r 5c4675ddc00c hotspot/src/share/vm/classfile/classFileParser.cpp.orig --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/hotspot/src/share/vm/classfile/classFileParser.cpp.orig Wed Oct 22 15:24:37 2014 -0700 @@ -0,0 +1,5274 @@ +/* + * 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; + u2 method_parameters_length = 0; + 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(); + if (method_attribute_length != (method_parameters_length * 4u) + 1u) { + 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 = 0; + } 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; +}