Mercurial > hg > truffle
view src/share/vm/classfile/classFileParser.cpp @ 690:d142f1feeed5
Merge
author | acorn |
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date | Sun, 29 Mar 2009 18:19:05 -0400 |
parents | 715dceaa89b7 |
children | e5b0439ef4ae |
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/* * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ #include "incls/_precompiled.incl" #include "incls/_classFileParser.cpp.incl" // 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 51 #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 void ClassFileParser::parse_constant_pool_entries(constantPoolHandle cp, 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 u1* old_current = cfs0->current(); #endif // 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_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 (AnonymousClasses && 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; symbolOop 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) { oopFactory::new_symbols(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) { oopFactory::new_symbols(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); } 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)); constantPoolOop constant_pool = oopFactory::new_constantPool(length, methodOopDesc::IsSafeConc, CHECK_(nullHandle)); constantPoolHandle cp (THREAD, constant_pool); cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops // parsing constant pool entries parse_constant_pool_entries(cp, 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 switch (cp->tag_at(index).value()) { 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_cp_range(klass_ref_index, length) && is_klass_reference(cp, 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_cp_range(name_ref_index, length) && cp->tag_at(name_ref_index).is_utf8(), "Invalid constant pool index %u in class file %s", name_ref_index, CHECK_(nullHandle)); check_property( valid_cp_range(signature_ref_index, length) && cp->tag_at(signature_ref_index).is_utf8(), "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_cp_range(class_index, length) && cp->tag_at(class_index).is_utf8(), "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_UnresolvedString : ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present break; case JVM_CONSTANT_StringIndex : { int string_index = cp->string_index_at(index); check_property( valid_cp_range(string_index, length) && cp->tag_at(string_index).is_utf8(), "Invalid constant pool index %u in class file %s", string_index, CHECK_(nullHandle)); symbolOop sym = cp->symbol_at(string_index); cp->unresolved_string_at_put(index, sym); } break; default: fatal1("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... assert(AnonymousClasses, ""); 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)); } } // Ensure that all the patches have been used. for (index = 0; index < _cp_patches->length(); index++) { guarantee_property(!has_cp_patch_at(index), "Unused constant pool patch at %d in class file %s", 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: { symbolHandle class_name(THREAD, cp->unresolved_klass_at(index)); // check the name, even if _cp_patches will overwrite it verify_legal_class_name(class_name, CHECK_(nullHandle)); break; } 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); symbolHandle name(THREAD, cp->symbol_at(name_ref_index)); symbolHandle signature(THREAD, cp->symbol_at(signature_ref_index)); if (tag == JVM_CONSTANT_Fieldref) { verify_legal_field_name(name, CHECK_(nullHandle)); verify_legal_field_signature(name, signature, CHECK_(nullHandle)); } else { verify_legal_method_name(name, CHECK_(nullHandle)); verify_legal_method_signature(name, signature, CHECK_(nullHandle)); if (tag == JVM_CONSTANT_Methodref) { // 4509014: If a class method name begins with '<', it must be "<init>". assert(!name.is_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; } } // end of switch } // end of for return cp; } void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) { assert(AnonymousClasses, ""); 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 (patch->klass() == SystemDictionary::class_klass()) { // %%% java_lang_Class::is_instance 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_klassOop(patch())); } else { guarantee_property(java_lang_String::is_instance(patch()), "Illegal class patch at %d in class file %s", index, CHECK); symbolHandle name = java_lang_String::as_symbol(patch(), CHECK); cp->unresolved_klass_at_put(index, name()); } break; case JVM_CONSTANT_UnresolvedString : // Patching a string means pre-resolving it. // The spelling in the constant pool is ignored. // The constant reference may be any object whatever. // If it is not a real interned string, the constant is referred // to as a "pseudo-string", and must be presented to the CP // explicitly, because it may require scavenging. cp->pseudo_string_at_put(index, patch()); break; 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: symbolOop _name; // name symbolOop _sig; // signature NameSigHash* _next; // Next entry in hash table }; #define HASH_ROW_SIZE 256 unsigned int hash(symbolOop name, symbolOop 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 symbolOop's to move. bool put_after_lookup(symbolOop name, symbolOop 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; } objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp, int length, Handle class_loader, Handle protection_domain, PerfTraceTime* vmtimer, symbolHandle class_name, TRAPS) { ClassFileStream* cfs = stream(); assert(length > 0, "only called for length>0"); objArrayHandle nullHandle; objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); objArrayHandle interfaces (THREAD, interface_oop); int index; for (index = 0; index < length; index++) { u2 interface_index = cfs->get_u2(CHECK_(nullHandle)); KlassHandle interf; check_property( valid_cp_range(interface_index, cp->length()) && is_klass_reference(cp, interface_index), "Interface name has bad constant pool index %u in class file %s", interface_index, CHECK_(nullHandle)); if (cp->tag_at(interface_index).is_klass()) { interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index)); } else { symbolHandle unresolved_klass (THREAD, 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_(nullHandle)); vmtimer->suspend(); // do not count recursive loading twice // Call resolve_super so classcircularity is checked klassOop k = SystemDictionary::resolve_super_or_fail(class_name, unresolved_klass, class_loader, protection_domain, false, CHECK_(nullHandle)); interf = KlassHandle(THREAD, k); vmtimer->resume(); if (LinkWellKnownClasses) // my super type is well known to me cp->klass_at_put(interface_index, interf()); // eagerly resolve } if (!Klass::cast(interf())->is_interface()) { THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle); } interfaces->obj_at_put(index, interf()); } if (!_need_verify || length <= 1) { return 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++) { klassOop k = (klassOop)interfaces->obj_at(index); symbolOop 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_(nullHandle)); } return interfaces; } void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, 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;", 18) && (value_type.is_string() || value_type.is_unresolved_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(constantPoolHandle cp, u2 attributes_count, bool is_static, u2 signature_index, u2* constantvalue_index_addr, bool* is_synthetic_addr, u2* generic_signature_index_addr, typeArrayHandle* field_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; 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_cp_range(attribute_name_index, cp->length()) && cp->tag_at(attribute_name_index).is_utf8(), "Invalid field attribute index %u in class file %s", attribute_name_index, CHECK); symbolOop 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, cp, 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 = cfs->get_u2(CHECK); } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { runtime_visible_annotations_length = attribute_length; runtime_visible_annotations = cfs->get_u1_buffer(); assert(runtime_visible_annotations != NULL, "null visible annotations"); cfs->skip_u1(runtime_visible_annotations_length, CHECK); } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { runtime_invisible_annotations_length = attribute_length; runtime_invisible_annotations = cfs->get_u1_buffer(); assert(runtime_invisible_annotations != NULL, "null invisible annotations"); cfs->skip_u1(runtime_invisible_annotations_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; *field_annotations = assemble_annotations(runtime_visible_annotations, runtime_visible_annotations_length, runtime_invisible_annotations, runtime_invisible_annotations_length, CHECK); 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, // long or double STATIC_ALIGNED_DOUBLE,// aligned long or double NONSTATIC_OOP, NONSTATIC_BYTE, NONSTATIC_SHORT, NONSTATIC_WORD, NONSTATIC_DOUBLE, NONSTATIC_ALIGNED_DOUBLE }; struct FieldAllocationCount { int static_oop_count; int static_byte_count; int static_short_count; int static_word_count; int static_double_count; int nonstatic_oop_count; int nonstatic_byte_count; int nonstatic_short_count; int nonstatic_word_count; int nonstatic_double_count; }; typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface, struct FieldAllocationCount *fac, objArrayHandle* fields_annotations, TRAPS) { ClassFileStream* cfs = stream(); typeArrayHandle nullHandle; cfs->guarantee_more(2, CHECK_(nullHandle)); // length u2 length = cfs->get_u2_fast(); // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index] typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle)); typeArrayHandle fields(THREAD, new_fields); int index = 0; typeArrayHandle field_annotations; for (int n = 0; n < length; n++) { cfs->guarantee_more(8, CHECK_(nullHandle)); // 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_(nullHandle)); access_flags.set_flags(flags); u2 name_index = cfs->get_u2_fast(); int cp_size = cp->length(); check_property( valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(), "Invalid constant pool index %u for field name in class file %s", name_index, CHECK_(nullHandle)); symbolHandle name(THREAD, cp->symbol_at(name_index)); verify_legal_field_name(name, CHECK_(nullHandle)); u2 signature_index = cfs->get_u2_fast(); check_property( valid_cp_range(signature_index, cp_size) && cp->tag_at(signature_index).is_utf8(), "Invalid constant pool index %u for field signature in class file %s", signature_index, CHECK_(nullHandle)); symbolHandle sig(THREAD, cp->symbol_at(signature_index)); verify_legal_field_signature(name, sig, CHECK_(nullHandle)); u2 constantvalue_index = 0; bool is_synthetic = false; u2 generic_signature_index = 0; bool is_static = access_flags.is_static(); u2 attributes_count = cfs->get_u2_fast(); if (attributes_count > 0) { parse_field_attributes(cp, attributes_count, is_static, signature_index, &constantvalue_index, &is_synthetic, &generic_signature_index, &field_annotations, CHECK_(nullHandle)); if (field_annotations.not_null()) { if (fields_annotations->is_null()) { objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); *fields_annotations = objArrayHandle(THREAD, md); } (*fields_annotations)->obj_at_put(n, field_annotations()); } if (is_synthetic) { access_flags.set_is_synthetic(); } } fields->short_at_put(index++, access_flags.as_short()); fields->short_at_put(index++, name_index); fields->short_at_put(index++, signature_index); fields->short_at_put(index++, constantvalue_index); // Remember how many oops we encountered and compute allocation type BasicType type = cp->basic_type_for_signature_at(signature_index); FieldAllocationType atype; if ( is_static ) { switch ( type ) { case T_BOOLEAN: case T_BYTE: fac->static_byte_count++; atype = STATIC_BYTE; break; case T_LONG: case T_DOUBLE: if (Universe::field_type_should_be_aligned(type)) { atype = STATIC_ALIGNED_DOUBLE; } else { atype = STATIC_DOUBLE; } fac->static_double_count++; break; case T_CHAR: case T_SHORT: fac->static_short_count++; atype = STATIC_SHORT; break; case T_FLOAT: case T_INT: fac->static_word_count++; atype = STATIC_WORD; break; case T_ARRAY: case T_OBJECT: fac->static_oop_count++; atype = STATIC_OOP; break; case T_ADDRESS: case T_VOID: default: assert(0, "bad field type"); } } else { switch ( type ) { case T_BOOLEAN: case T_BYTE: fac->nonstatic_byte_count++; atype = NONSTATIC_BYTE; break; case T_LONG: case T_DOUBLE: if (Universe::field_type_should_be_aligned(type)) { atype = NONSTATIC_ALIGNED_DOUBLE; } else { atype = NONSTATIC_DOUBLE; } fac->nonstatic_double_count++; break; case T_CHAR: case T_SHORT: fac->nonstatic_short_count++; atype = NONSTATIC_SHORT; break; case T_FLOAT: case T_INT: fac->nonstatic_word_count++; atype = NONSTATIC_WORD; break; case T_ARRAY: case T_OBJECT: fac->nonstatic_oop_count++; atype = NONSTATIC_OOP; break; case T_ADDRESS: case T_VOID: default: assert(0, "bad field type"); } } // The correct offset is computed later (all oop fields will be located together) // We temporarily store the allocation type in the offset field fields->short_at_put(index++, atype); fields->short_at_put(index++, 0); // Clear out high word of byte offset fields->short_at_put(index++, generic_signature_index); } 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 (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) { int name_index = fields->ushort_at(i + instanceKlass::name_index_offset); symbolOop name = cp->symbol_at(name_index); int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset); symbolOop sig = cp->symbol_at(sig_index); // 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_(nullHandle)); } } return fields; } static void copy_u2_with_conversion(u2* dest, u2* src, int length) { while (length-- > 0) { *dest++ = Bytes::get_Java_u2((u1*) (src++)); } } typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length, u4 exception_table_length, constantPoolHandle cp, TRAPS) { ClassFileStream* cfs = stream(); typeArrayHandle nullHandle; // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index] typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle)); typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh); int index = 0; cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index 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(); // Will check legal target after parsing code array in verifier. if (_need_verify) { guarantee_property((start_pc < end_pc) && (end_pc <= code_length), "Illegal exception table range in class file %s", CHECK_(nullHandle)); guarantee_property(handler_pc < code_length, "Illegal exception table handler in class file %s", CHECK_(nullHandle)); if (catch_type_index != 0) { guarantee_property(valid_cp_range(catch_type_index, cp->length()) && is_klass_reference(cp, catch_type_index), "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle)); } } exception_handlers->int_at_put(index++, start_pc); exception_handlers->int_at_put(index++, end_pc); exception_handlers->int_at_put(index++, handler_pc); exception_handlers->int_at_put(index++, catch_type_index); } return exception_handlers; } 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, constantPoolHandle cp, 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_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(), "Name index %u in %s has bad constant type in class file %s", name_index, tbl_name, CHECK_NULL); guarantee_property( valid_cp_range(descriptor_index, cp_size) && cp->tag_at(descriptor_index).is_utf8(), "Signature index %u in %s has bad constant type in class file %s", descriptor_index, tbl_name, CHECK_NULL); symbolHandle name(THREAD, cp->symbol_at(name_index)); symbolHandle sig(THREAD, 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, constantPoolHandle cp, 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_cp_range(class_index, cp->length()) && is_klass_reference(cp, 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; } typeArrayOop 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; } typeArrayOop stackmap_data = oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL); stackmap_data->set_length(code_attribute_length); memcpy((void*)stackmap_data->byte_at_addr(0), (void*)stackmap_table_start, code_attribute_length); return stackmap_data; } u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length, u4 method_attribute_length, constantPoolHandle cp, 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_cp_range(checked_exception, cp->length()) && is_klass_reference(cp, 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; } #define MAX_ARGS_SIZE 255 #define MAX_CODE_SIZE 65535 #define INITIAL_MAX_LVT_NUMBER 256 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the // methodOop to save footprint, so we only know the size of the resulting methodOop 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(constantPoolHandle cp, bool is_interface, AccessFlags *promoted_flags, typeArrayHandle* method_annotations, typeArrayHandle* method_parameter_annotations, typeArrayHandle* method_default_annotations, 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_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(), "Illegal constant pool index %u for method name in class file %s", name_index, CHECK_(nullHandle)); symbolHandle name(THREAD, cp->symbol_at(name_index)); verify_legal_method_name(name, CHECK_(nullHandle)); u2 signature_index = cfs->get_u2_fast(); guarantee_property( valid_cp_range(signature_index, cp_size) && cp->tag_at(signature_index).is_utf8(), "Illegal constant pool index %u for method signature in class file %s", signature_index, CHECK_(nullHandle)); symbolHandle signature(THREAD, cp->symbol_at(signature_index)); AccessFlags access_flags; if (name == vmSymbols::class_initializer_name()) { // We ignore the access flags for a class initializer. (JVM Spec. p. 116) flags = JVM_ACC_STATIC; } 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; typeArrayHandle exception_handlers(THREAD, 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; bool parsed_code_attribute = false; bool parsed_checked_exceptions_attribute = false; bool parsed_stackmap_attribute = false; // stackmap attribute - JDK1.5 typeArrayHandle stackmap_data; u2 generic_signature_index = 0; 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* 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_cp_range(method_attribute_name_index, cp_size) && cp->tag_at(method_attribute_name_index).is_utf8(), "Invalid method attribute name index %u in class file %s", method_attribute_name_index, CHECK_(nullHandle)); symbolOop 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_handlers = parse_exception_table(code_length, exception_table_length, cp, 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_cp_range(code_attribute_name_index, cp_size) && cp->tag_at(code_attribute_name_index).is_utf8(), "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; REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 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, cp, &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; REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 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, cp, &localvariable_type_table_length[lvtt_cnt], true, // is LVTT CHECK_(nullHandle)); lvtt_cnt++; } else if (UseSplitVerifier && _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)); } typeArrayOop sm = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle)); stackmap_data = typeArrayHandle(THREAD, sm); 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, cp, CHECK_(nullHandle)); } 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)); } cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index generic_signature_index = cfs->get_u2_fast(); } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { runtime_visible_annotations_length = method_attribute_length; runtime_visible_annotations = cfs->get_u1_buffer(); assert(runtime_visible_annotations != NULL, "null visible annotations"); cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle)); } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 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(runtime_invisible_annotations_length, CHECK_(nullHandle)); } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 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 (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 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(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle)); } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 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 { // 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 methodOop is finally available, now create it methodOop m_oop = oopFactory::new_method( code_length, access_flags, linenumber_table_length, total_lvt_length, checked_exceptions_length, methodOopDesc::IsSafeConc, CHECK_(nullHandle)); methodHandle m (THREAD, m_oop); ClassLoadingService::add_class_method_size(m_oop->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); m->set_generic_signature_index(generic_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); m->constMethod()->set_stackmap_data(stackmap_data()); /** * The exception_table field is the flag used to indicate * that the methodOop and it's associated constMethodOop are partially * initialized and thus are exempt from pre/post GC verification. Once * the field is set, the oops are considered fully initialized so make * sure that the oops can pass verification when this field is set. */ m->set_exception_table(exception_handlers()); // Copy byte codes if (code_length > 0) { memcpy(m->code_base(), code_start, code_length); } // Copy line number table if (linenumber_table != NULL) { memcpy(m->compressed_linenumber_table(), linenumber_table->buffer(), linenumber_table_length); } // 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. * * 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. */ if (total_lvt_length > 0) { int tbl_no, idx; promoted_flags->set_has_localvariable_table(); 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 = m->localvariable_table_start(); for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; for (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_(nullHandle)); } } } // To merge LocalVariableTable and LocalVariableTypeTable Classfile_LVT_Element* cf_lvtt; LocalVariableTableElement lvtt_elem; for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; for (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_(nullHandle)); } } 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_(nullHandle)); } else { // to add generic signatures into LocalVariableTable entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index; } } } clear_hashtable(lvt_Hash); } *method_annotations = assemble_annotations(runtime_visible_annotations, runtime_visible_annotations_length, runtime_invisible_annotations, runtime_invisible_annotations_length, CHECK_(nullHandle)); *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations, runtime_visible_parameter_annotations_length, runtime_invisible_parameter_annotations, runtime_invisible_parameter_annotations_length, CHECK_(nullHandle)); *method_default_annotations = assemble_annotations(annotation_default, annotation_default_length, NULL, 0, CHECK_(nullHandle)); 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; } 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. objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface, AccessFlags* promoted_flags, bool* has_final_method, objArrayOop* methods_annotations_oop, objArrayOop* methods_parameter_annotations_oop, objArrayOop* methods_default_annotations_oop, TRAPS) { ClassFileStream* cfs = stream(); objArrayHandle nullHandle; typeArrayHandle method_annotations; typeArrayHandle method_parameter_annotations; typeArrayHandle method_default_annotations; cfs->guarantee_more(2, CHECK_(nullHandle)); // length u2 length = cfs->get_u2_fast(); if (length == 0) { return objArrayHandle(THREAD, Universe::the_empty_system_obj_array()); } else { objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); objArrayHandle methods(THREAD, m); HandleMark hm(THREAD); objArrayHandle methods_annotations; objArrayHandle methods_parameter_annotations; objArrayHandle methods_default_annotations; for (int index = 0; index < length; index++) { methodHandle method = parse_method(cp, is_interface, promoted_flags, &method_annotations, &method_parameter_annotations, &method_default_annotations, CHECK_(nullHandle)); if (method->is_final()) { *has_final_method = true; } methods->obj_at_put(index, method()); if (method_annotations.not_null()) { if (methods_annotations.is_null()) { objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); methods_annotations = objArrayHandle(THREAD, md); } methods_annotations->obj_at_put(index, method_annotations()); } if (method_parameter_annotations.not_null()) { if (methods_parameter_annotations.is_null()) { objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); methods_parameter_annotations = objArrayHandle(THREAD, md); } methods_parameter_annotations->obj_at_put(index, method_parameter_annotations()); } if (method_default_annotations.not_null()) { if (methods_default_annotations.is_null()) { objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); methods_default_annotations = objArrayHandle(THREAD, md); } methods_default_annotations->obj_at_put(index, method_default_annotations()); } } 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++) { methodOop m = (methodOop)methods->obj_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_(nullHandle)); } } *methods_annotations_oop = methods_annotations(); *methods_parameter_annotations_oop = methods_parameter_annotations(); *methods_default_annotations_oop = methods_default_annotations(); return methods; } } typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods, objArrayHandle methods_annotations, objArrayHandle methods_parameter_annotations, objArrayHandle methods_default_annotations, TRAPS) { typeArrayHandle nullHandle; int length = methods()->length(); // If JVMTI original method ordering is enabled we have to // remember the original class file ordering. // We temporarily use the vtable_index field in the methodOop to store the // class file index, so we can read in after calling qsort. if (JvmtiExport::can_maintain_original_method_order()) { for (int index = 0; index < length; index++) { methodOop m = methodOop(methods->obj_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 symbolOopDesc::fast_compare methodOopDesc::sort_methods(methods(), methods_annotations(), methods_parameter_annotations(), methods_default_annotations()); // If JVMTI original method ordering is enabled construct int array remembering the original ordering if (JvmtiExport::can_maintain_original_method_order()) { typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle)); typeArrayHandle method_ordering(THREAD, new_ordering); for (int index = 0; index < length; index++) { methodOop m = methodOop(methods->obj_at(index)); int old_index = m->vtable_index(); assert(old_index >= 0 && old_index < length, "invalid method index"); method_ordering->int_at_put(index, old_index); m->set_vtable_index(methodOopDesc::invalid_vtable_index); } return method_ordering; } else { return typeArrayHandle(THREAD, Universe::the_empty_int_array()); } } void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { ClassFileStream* cfs = stream(); cfs->guarantee_more(2, CHECK); // sourcefile_index u2 sourcefile_index = cfs->get_u2_fast(); check_property( valid_cp_range(sourcefile_index, cp->length()) && cp->tag_at(sourcefile_index).is_utf8(), "Invalid SourceFile attribute at constant pool index %u in class file %s", sourcefile_index, CHECK); k->set_source_file_name(cp->symbol_at(sourcefile_index)); } void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp, instanceKlassHandle k, 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()) { // Optimistically assume that only 1 byte UTF format is used // (common case) symbolOop sde_symbol = oopFactory::new_symbol((char*)sde_buffer, length, CHECK); k->set_source_debug_extension(sde_symbol); } // 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(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { ClassFileStream* cfs = stream(); cfs->guarantee_more(2, CHECK_0); // length u2 length = cfs->get_u2_fast(); // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags] typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0); typeArrayHandle inner_classes(THREAD, ic); 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_cp_range(inner_class_info_index, cp_size) && is_klass_reference(cp, 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_cp_range(outer_class_info_index, cp_size) && is_klass_reference(cp, 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_cp_range(inner_name_index, cp_size) && cp->tag_at(inner_name_index).is_utf8()), "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->short_at_put(index++, inner_class_info_index); inner_classes->short_at_put(index++, outer_class_info_index); inner_classes->short_at_put(index++, inner_name_index); inner_classes->short_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 < inner_classes->length(); i += 4) { for(int j = i + 4; j < inner_classes->length(); j += 4) { guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) || inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) || inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) || inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)), "Duplicate entry in InnerClasses in class file %s", CHECK_0); } } } // Update instanceKlass with inner class info. k->set_inner_classes(inner_classes()); return length; } void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { k->set_is_synthetic(); } void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { ClassFileStream* cfs = stream(); u2 signature_index = cfs->get_u2(CHECK); check_property( valid_cp_range(signature_index, cp->length()) && cp->tag_at(signature_index).is_utf8(), "Invalid constant pool index %u in Signature attribute in class file %s", signature_index, CHECK); k->set_generic_signature(cp->symbol_at(signature_index)); } void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { ClassFileStream* cfs = stream(); // Set inner classes attribute to default sentinel k->set_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; u1* runtime_visible_annotations = NULL; int runtime_visible_annotations_length = 0; u1* runtime_invisible_annotations = NULL; int runtime_invisible_annotations_length = 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_cp_range(attribute_name_index, cp->length()) && cp->tag_at(attribute_name_index).is_utf8(), "Attribute name has bad constant pool index %u in class file %s", attribute_name_index, CHECK); symbolOop 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(cp, k, CHECK); } else if (tag == vmSymbols::tag_source_debug_extension()) { // Check for SourceDebugExtension tag parse_classfile_source_debug_extension_attribute(cp, k, (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; } u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK); if (_need_verify && _major_version >= JAVA_1_5_VERSION) { guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, "Wrong InnerClasses attribute length in class file %s", 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(cp, k, 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(cp, k, CHECK); } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { runtime_visible_annotations_length = attribute_length; runtime_visible_annotations = cfs->get_u1_buffer(); assert(runtime_visible_annotations != NULL, "null visible annotations"); cfs->skip_u1(runtime_visible_annotations_length, CHECK); } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) { runtime_invisible_annotations_length = attribute_length; runtime_invisible_annotations = cfs->get_u1_buffer(); assert(runtime_invisible_annotations != NULL, "null invisible annotations"); cfs->skip_u1(runtime_invisible_annotations_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; } cfs->guarantee_more(4, CHECK); // class_index, method_index u2 class_index = cfs->get_u2_fast(); u2 method_index = cfs->get_u2_fast(); if (class_index == 0) { classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); } // Validate the constant pool indices and types if (!cp->is_within_bounds(class_index) || !is_klass_reference(cp, class_index)) { classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); } if (method_index != 0 && (!cp->is_within_bounds(method_index) || !cp->tag_at(method_index).is_name_and_type())) { classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); } k->set_enclosing_method_indices(class_index, method_index); } else { // Unknown attribute cfs->skip_u1(attribute_length, CHECK); } } else { // Unknown attribute cfs->skip_u1(attribute_length, CHECK); } } typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations, runtime_visible_annotations_length, runtime_invisible_annotations, runtime_invisible_annotations_length, CHECK); k->set_class_annotations(annotations()); } typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations, int runtime_visible_annotations_length, u1* runtime_invisible_annotations, int runtime_invisible_annotations_length, TRAPS) { typeArrayHandle annotations; if (runtime_visible_annotations != NULL || runtime_invisible_annotations != NULL) { typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length + runtime_invisible_annotations_length, CHECK_(annotations)); annotations = typeArrayHandle(THREAD, anno); if (runtime_visible_annotations != NULL) { memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length); } if (runtime_invisible_annotations != NULL) { memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length); } } return annotations; } static void initialize_static_field(fieldDescriptor* fd, TRAPS) { KlassHandle h_k (THREAD, fd->field_holder()); assert(h_k.not_null() && fd->is_static(), "just checking"); if (fd->has_initial_value()) { BasicType t = fd->field_type(); switch (t) { case T_BYTE: h_k()->byte_field_put(fd->offset(), fd->int_initial_value()); break; case T_BOOLEAN: h_k()->bool_field_put(fd->offset(), fd->int_initial_value()); break; case T_CHAR: h_k()->char_field_put(fd->offset(), fd->int_initial_value()); break; case T_SHORT: h_k()->short_field_put(fd->offset(), fd->int_initial_value()); break; case T_INT: h_k()->int_field_put(fd->offset(), fd->int_initial_value()); break; case T_FLOAT: h_k()->float_field_put(fd->offset(), fd->float_initial_value()); break; case T_DOUBLE: h_k()->double_field_put(fd->offset(), fd->double_initial_value()); break; case T_LONG: h_k()->long_field_put(fd->offset(), fd->long_initial_value()); break; case T_OBJECT: { #ifdef ASSERT symbolOop sym = oopFactory::new_symbol("Ljava/lang/String;", CHECK); assert(fd->signature() == sym, "just checking"); #endif oop string = fd->string_initial_value(CHECK); h_k()->obj_field_put(fd->offset(), string); } break; default: THROW_MSG(vmSymbols::java_lang_ClassFormatError(), "Illegal ConstantValue attribute in class file"); } } } void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr, constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) { // This code is for compatibility with earlier jdk's that do not // have the "discovered" field in java.lang.ref.Reference. For 1.5 // the check for the "discovered" field should issue a warning if // the field is not found. For 1.6 this code should be issue a // fatal error if the "discovered" field is not found. // // Increment fac.nonstatic_oop_count so that the start of the // next type of non-static oops leaves room for the fake oop. // Do not increment next_nonstatic_oop_offset so that the // fake oop is place after the java.lang.ref.Reference oop // fields. // // Check the fields in java.lang.ref.Reference for the "discovered" // field. If it is not present, artifically create a field for it. // This allows this VM to run on early JDK where the field is not // present. // // Increment fac.nonstatic_oop_count so that the start of the // next type of non-static oops leaves room for the fake oop. // Do not increment next_nonstatic_oop_offset so that the // fake oop is place after the java.lang.ref.Reference oop // fields. // // Check the fields in java.lang.ref.Reference for the "discovered" // field. If it is not present, artifically create a field for it. // This allows this VM to run on early JDK where the field is not // present. int reference_sig_index = 0; int reference_name_index = 0; int reference_index = 0; int extra = java_lang_ref_Reference::number_of_fake_oop_fields; const int n = (*fields_ptr)()->length(); for (int i = 0; i < n; i += instanceKlass::next_offset ) { int name_index = (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset); int sig_index = (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset); symbolOop f_name = cp->symbol_at(name_index); symbolOop f_sig = cp->symbol_at(sig_index); if (f_sig == vmSymbols::reference_signature() && reference_index == 0) { // Save the index for reference signature for later use. // The fake discovered field does not entries in the // constant pool so the index for its signature cannot // be extracted from the constant pool. It will need // later, however. It's signature is vmSymbols::reference_signature() // so same an index for that signature. reference_sig_index = sig_index; reference_name_index = name_index; reference_index = i; } if (f_name == vmSymbols::reference_discovered_name() && f_sig == vmSymbols::reference_signature()) { // The values below are fake but will force extra // non-static oop fields and a corresponding non-static // oop map block to be allocated. extra = 0; break; } } if (extra != 0) { fac_ptr->nonstatic_oop_count += extra; // Add the additional entry to "fields" so that the klass // contains the "discoverd" field and the field will be initialized // in instances of the object. int fields_with_fix_length = (*fields_ptr)()->length() + instanceKlass::next_offset; typeArrayOop ff = oopFactory::new_permanent_shortArray( fields_with_fix_length, CHECK); typeArrayHandle fields_with_fix(THREAD, ff); // Take everything from the original but the length. for (int idx = 0; idx < (*fields_ptr)->length(); idx++) { fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx)); } // Add the fake field at the end. int i = (*fields_ptr)->length(); // There is no name index for the fake "discovered" field nor // signature but a signature is needed so that the field will // be properly initialized. Use one found for // one of the other reference fields. Be sure the index for the // name is 0. In fieldDescriptor::initialize() the index of the // name is checked. That check is by passed for the last nonstatic // oop field in a java.lang.ref.Reference which is assumed to be // this artificial "discovered" field. An assertion checks that // the name index is 0. assert(reference_index != 0, "Missing signature for reference"); int j; for (j = 0; j < instanceKlass::next_offset; j++) { fields_with_fix->ushort_at_put(i + j, (*fields_ptr)->ushort_at(reference_index +j)); } // Clear the public access flag and set the private access flag. short flags; flags = fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset); assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set"); flags = flags & (~JVM_ACC_PUBLIC); flags = flags | JVM_ACC_PRIVATE; AccessFlags access_flags; access_flags.set_flags(flags); assert(!access_flags.is_public(), "Failed to clear public flag"); assert(access_flags.is_private(), "Failed to set private flag"); fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset, flags); assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset) == reference_name_index, "The fake reference name is incorrect"); assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset) == reference_sig_index, "The fake reference signature is incorrect"); // The type of the field is stored in the low_offset entry during // parsing. assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) == NONSTATIC_OOP, "The fake reference type is incorrect"); // "fields" is allocated in the permanent generation. Disgard // it and let it be collected. (*fields_ptr) = fields_with_fix; } return; } void ClassFileParser::java_lang_Class_fix_pre(objArrayHandle* methods_ptr, FieldAllocationCount *fac_ptr, TRAPS) { // Add fake fields for java.lang.Class instances // // This is not particularly nice. We should consider adding a // private transient object field at the Java level to // java.lang.Class. Alternatively we could add a subclass of // instanceKlass which provides an accessor and size computer for // this field, but that appears to be more code than this hack. // // NOTE that we wedge these in at the beginning rather than the // end of the object because the Class layout changed between JDK // 1.3 and JDK 1.4 with the new reflection implementation; some // nonstatic oop fields were added at the Java level. The offsets // of these fake fields can't change between these two JDK // versions because when the offsets are computed at bootstrap // time we don't know yet which version of the JDK we're running in. // The values below are fake but will force two non-static oop fields and // a corresponding non-static oop map block to be allocated. const int extra = java_lang_Class::number_of_fake_oop_fields; fac_ptr->nonstatic_oop_count += extra; } void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) { // Cause the extra fake fields in java.lang.Class to show up before // the Java fields for layout compatibility between 1.3 and 1.4 // Incrementing next_nonstatic_oop_offset here advances the // location where the real java fields are placed. const int extra = java_lang_Class::number_of_fake_oop_fields; (*next_nonstatic_oop_offset_ptr) += (extra * heapOopSize); } instanceKlassHandle ClassFileParser::parseClassFile(symbolHandle name, Handle class_loader, Handle protection_domain, GrowableArray<Handle>* cp_patches, symbolHandle& parsed_name, TRAPS) { // So that JVMTI can cache class file in the state before retransformable agents // have modified it unsigned char *cached_class_file_bytes = NULL; jint cached_class_file_length; ClassFileStream* cfs = stream(); // Timing PerfTraceTime vmtimer(ClassLoader::perf_accumulated_time()); _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false; if (JvmtiExport::should_post_class_file_load_hook()) { 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_bytes, &cached_class_file_length); 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); } } _cp_patches = cp_patches; instanceKlassHandle nullHandle; // Figure out whether we can skip format checking (matching classic VM behavior) _need_verify = Verifier::should_verify_for(class_loader()); // Set the verify flag in stream cfs->set_verify(_need_verify); // Save the class file name for easier error message printing. _class_name = name.not_null()? name : vmSymbolHandles::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(); // Check version numbers - we check this even with verifier off if (!is_supported_version(major_version, minor_version)) { if (name.is_null()) { Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbolHandles::java_lang_UnsupportedClassVersionError(), "Unsupported major.minor version %u.%u", major_version, minor_version); } else { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbolHandles::java_lang_UnsupportedClassVersionError(), "%s : Unsupported major.minor version %u.%u", name->as_C_string(), major_version, 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 instanceKlassHandle super_klass; 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)); symbolHandle class_name (THREAD, cp->unresolved_klass_at(this_class_index)); assert(class_name.not_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; // 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)); } klassOop 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.not_null() && class_name() != name()) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbolHandles::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()->as_klass_external_name()); if (cfs->source() != NULL) tty->print(" from %s", cfs->source()); tty->print_cr("]"); } u2 super_class_index = cfs->get_u2_fast(); 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_(nullHandle)); } else { check_property(valid_cp_range(super_class_index, cp_size) && is_klass_reference(cp, super_class_index), "Invalid superclass index %u in class file %s", super_class_index, CHECK_(nullHandle)); // 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->unresolved_klass_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_(nullHandle)); } } // Interfaces u2 itfs_len = cfs->get_u2_fast(); objArrayHandle local_interfaces; if (itfs_len == 0) { local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array()); } else { local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, &vmtimer, _class_name, CHECK_(nullHandle)); } // Fields (offsets are filled in later) struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0}; objArrayHandle fields_annotations; typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle)); // Methods bool has_final_method = false; AccessFlags promoted_flags; promoted_flags.set_flags(0); // These need to be oop pointers because they are allocated lazily // inside parse_methods inside a nested HandleMark objArrayOop methods_annotations_oop = NULL; objArrayOop methods_parameter_annotations_oop = NULL; objArrayOop methods_default_annotations_oop = NULL; objArrayHandle methods = parse_methods(cp, access_flags.is_interface(), &promoted_flags, &has_final_method, &methods_annotations_oop, &methods_parameter_annotations_oop, &methods_default_annotations_oop, CHECK_(nullHandle)); objArrayHandle methods_annotations(THREAD, methods_annotations_oop); objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop); objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop); // We check super class after class file is parsed and format is checked if (super_class_index > 0 && super_klass.is_null()) { symbolHandle sk (THREAD, 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)); } klassOop 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 (LinkWellKnownClasses) // my super class is well known to me cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve } if (super_klass.not_null()) { if (super_klass->is_interface()) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbolHandles::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); } } // Compute the transitive list of all unique interfaces implemented by this class objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle)); // sort methods typeArrayHandle method_ordering = sort_methods(methods, methods_annotations, methods_parameter_annotations, methods_default_annotations, CHECK_(nullHandle)); // 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; klassVtable::compute_vtable_size_and_num_mirandas(vtable_size, num_miranda_methods, 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); // Field size and offset computation int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size(); #ifndef PRODUCT int orig_nonstatic_field_size = 0; #endif int static_field_size = 0; 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_static_type_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 next_nonstatic_type_offset; int first_nonstatic_oop_offset; int first_nonstatic_field_offset; int next_nonstatic_field_offset; // Calculate the starting byte offsets next_static_oop_offset = (instanceKlass::header_size() + align_object_offset(vtable_size) + align_object_offset(itable_size)) * wordSize; next_static_double_offset = next_static_oop_offset + (fac.static_oop_count * heapOopSize); if ( fac.static_double_count && (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.static_double_count * BytesPerLong); next_static_short_offset = next_static_word_offset + (fac.static_word_count * BytesPerInt); next_static_byte_offset = next_static_short_offset + (fac.static_short_count * BytesPerShort); next_static_type_offset = align_size_up((next_static_byte_offset + fac.static_byte_count ), wordSize ); static_field_size = (next_static_type_offset - next_static_oop_offset) / wordSize; first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size * heapOopSize; next_nonstatic_field_offset = first_nonstatic_field_offset; // Add fake fields for java.lang.Class instances (also see below) if (class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) { java_lang_Class_fix_pre(&methods, &fac, CHECK_(nullHandle)); } // Add a fake "discovered" field if it is not present // for compatibility with earlier jdk's. if (class_name() == vmSymbols::java_lang_ref_Reference() && class_loader.is_null()) { java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle)); } // end of "discovered" field compactibility fix int nonstatic_double_count = fac.nonstatic_double_count; int nonstatic_word_count = fac.nonstatic_word_count; int nonstatic_short_count = fac.nonstatic_short_count; int nonstatic_byte_count = fac.nonstatic_byte_count; int nonstatic_oop_count = fac.nonstatic_oop_count; bool super_has_nonstatic_fields = (super_klass() != NULL && super_klass->has_nonstatic_fields()); bool has_nonstatic_fields = super_has_nonstatic_fields || ((nonstatic_double_count + nonstatic_word_count + nonstatic_short_count + nonstatic_byte_count + nonstatic_oop_count) != 0); // Prepare list of oops for oop maps generation. u2* nonstatic_oop_offsets; u2* nonstatic_oop_length; int nonstatic_oop_map_count = 0; nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD( THREAD, u2, nonstatic_oop_count+1); nonstatic_oop_length = NEW_RESOURCE_ARRAY_IN_THREAD( THREAD, u2, nonstatic_oop_count+1); // Add fake fields for java.lang.Class instances (also see above). // FieldsAllocationStyle and CompactFields values will be reset to default. if(class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) { java_lang_Class_fix_post(&next_nonstatic_field_offset); nonstatic_oop_offsets[0] = (u2)first_nonstatic_field_offset; int fake_oop_count = (( next_nonstatic_field_offset - first_nonstatic_field_offset ) / heapOopSize); nonstatic_oop_length [0] = (u2)fake_oop_count; nonstatic_oop_map_count = 1; nonstatic_oop_count -= fake_oop_count; first_nonstatic_oop_offset = first_nonstatic_field_offset; } else { first_nonstatic_oop_offset = 0; // will be set for first oop field } #ifndef PRODUCT if( PrintCompactFieldsSavings ) { next_nonstatic_double_offset = next_nonstatic_field_offset + (nonstatic_oop_count * heapOopSize); if ( nonstatic_double_count > 0 ) { next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong); } 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_type_offset = align_size_up((next_nonstatic_byte_offset + nonstatic_byte_count ), heapOopSize ); orig_nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize); } #endif bool compact_fields = CompactFields; int allocation_style = FieldsAllocationStyle; if( allocation_style < 0 || allocation_style > 1 ) { // Out of range? assert(false, "0 <= FieldsAllocationStyle <= 1"); 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 } if( allocation_style == 0 ) { // Fields order: oops, longs/doubles, ints, shorts/chars, bytes 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 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; 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); int notaligned_offset; if( allocation_style == 0 ) { notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count; } else { // allocation_style == 1 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count; if( nonstatic_oop_count > 0 ) { next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize); } notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); } next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize ); nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset - first_nonstatic_field_offset)/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). int len = fields->length(); for (int i = 0; i < len; i += instanceKlass::next_offset) { int real_offset; FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i+4); 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_ALIGNED_DOUBLE: 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] == (u2)(real_offset - nonstatic_oop_length[nonstatic_oop_map_count - 1] * heapOopSize) ) { // Extend current oop map nonstatic_oop_length[nonstatic_oop_map_count - 1] += 1; } else { // Create new oop map nonstatic_oop_offsets[nonstatic_oop_map_count] = (u2)real_offset; nonstatic_oop_length [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_ALIGNED_DOUBLE: case NONSTATIC_DOUBLE: real_offset = next_nonstatic_double_offset; next_nonstatic_double_offset += BytesPerLong; break; default: ShouldNotReachHere(); } fields->short_at_put(i+4, extract_low_short_from_int(real_offset) ); fields->short_at_put(i+5, extract_high_short_from_int(real_offset) ); } // Size of instances int instance_size; next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize ); instance_size = align_object_size(next_nonstatic_type_offset / 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"); // Size of non-static oop map blocks (in words) allocated at end of klass int nonstatic_oop_map_size = compute_oop_map_size(super_klass, nonstatic_oop_map_count, first_nonstatic_oop_offset); // Compute reference type ReferenceType rt; if (super_klass() == NULL) { rt = REF_NONE; } else { rt = super_klass->reference_type(); } // We can now create the basic klassOop for this klass klassOop ik = oopFactory::new_instanceKlass( vtable_size, itable_size, static_field_size, nonstatic_oop_map_size, rt, CHECK_(nullHandle)); instanceKlassHandle this_klass (THREAD, ik); assert(this_klass->static_field_size() == static_field_size && this_klass->nonstatic_oop_map_size() == nonstatic_oop_map_size, "sanity check"); // Fill in information already parsed this_klass->set_access_flags(access_flags); jint lh = Klass::instance_layout_helper(instance_size, false); this_klass->set_layout_helper(lh); assert(this_klass->oop_is_instance(), "layout is correct"); assert(this_klass->size_helper() == 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(class_loader()); this_klass->set_nonstatic_field_size(nonstatic_field_size); this_klass->set_has_nonstatic_fields(has_nonstatic_fields); this_klass->set_static_oop_field_size(fac.static_oop_count); cp->set_pool_holder(this_klass()); this_klass->set_constants(cp()); this_klass->set_local_interfaces(local_interfaces()); this_klass->set_fields(fields()); this_klass->set_methods(methods()); if (has_final_method) { this_klass->set_has_final_method(); } this_klass->set_method_ordering(method_ordering()); this_klass->set_initial_method_idnum(methods->length()); this_klass->set_name(cp->klass_name_at(this_class_index)); if (LinkWellKnownClasses) // I am well known to myself cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve this_klass->set_protection_domain(protection_domain()); this_klass->set_fields_annotations(fields_annotations()); this_klass->set_methods_annotations(methods_annotations()); this_klass->set_methods_parameter_annotations(methods_parameter_annotations()); this_klass->set_methods_default_annotations(methods_default_annotations()); this_klass->set_minor_version(minor_version); this_klass->set_major_version(major_version); if (cached_class_file_bytes != NULL) { // JVMTI: we have an instanceKlass now, tell it about the cached bytes this_klass->set_cached_class_file(cached_class_file_bytes, cached_class_file_length); } // 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 } // Additional attributes parse_classfile_attributes(cp, this_klass, 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)); // Initialize static fields this_klass->do_local_static_fields(&initialize_static_field, CHECK_(nullHandle)); // VerifyOops believes that once this has been set, the object is completely loaded. // Compute transitive closure of interfaces this class implements this_klass->set_transitive_interfaces(transitive_interfaces()); // 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); // Do final class setup fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_length); 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()) { check_illegal_static_method(this_klass, CHECK_(nullHandle)); } ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()), false /* not shared class */); if (TraceClassLoading) { // 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()) { if (THREAD->is_Java_thread()) { klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1); 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 { ResourceMark rm; tty->print("[Loaded %s from %s]\n", this_klass->external_name(), instanceKlass::cast(class_loader->klass())->external_name()); } } if (TraceClassResolution) { // print out the superclass. const char * from = Klass::cast(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. objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces()); if (!local_interfaces.is_null()) { int length = local_interfaces->length(); for (int i = 0; i < length; i++) { klassOop k = klassOop(local_interfaces->obj_at(i)); instanceKlass* to_class = instanceKlass::cast(k); const char * to = to_class->external_name(); tty->print("RESOLVE %s %s (interface)\n", from, to); } } } #ifndef PRODUCT if( PrintCompactFieldsSavings ) { if( nonstatic_field_size < orig_nonstatic_field_size ) { tty->print("[Saved %d of %d bytes in %s]\n", (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize, orig_nonstatic_field_size*heapOopSize, this_klass->external_name()); } else if( nonstatic_field_size > orig_nonstatic_field_size ) { tty->print("[Wasted %d over %d bytes in %s]\n", (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize, orig_nonstatic_field_size*heapOopSize, this_klass->external_name()); } } #endif // preserve result across HandleMark preserve_this_klass = this_klass(); } // Create new handle outside HandleMark instanceKlassHandle this_klass (THREAD, preserve_this_klass); debug_only(this_klass->as_klassOop()->verify();) return this_klass; } int ClassFileParser::compute_oop_map_size(instanceKlassHandle super, int nonstatic_oop_map_count, int first_nonstatic_oop_offset) { int map_size = super.is_null() ? 0 : super->nonstatic_oop_map_size(); if (nonstatic_oop_map_count > 0) { // We have oops to add to map if (map_size == 0) { map_size = nonstatic_oop_map_count; } else { // Check whether we should add a new map block or whether the last one can be extended OopMapBlock* first_map = super->start_of_nonstatic_oop_maps(); OopMapBlock* last_map = first_map + map_size - 1; int next_offset = last_map->offset() + (last_map->length() * 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_size += nonstatic_oop_map_count; } } return map_size; } void ClassFileParser::fill_oop_maps(instanceKlassHandle k, int nonstatic_oop_map_count, u2* nonstatic_oop_offsets, u2* nonstatic_oop_length) { OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps(); OopMapBlock* last_oop_map = this_oop_map + k->nonstatic_oop_map_size(); instanceKlass* super = k->superklass(); if (super != NULL) { int super_oop_map_size = super->nonstatic_oop_map_size(); OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps(); // Copy maps from superklass while (super_oop_map_size-- > 0) { *this_oop_map++ = *super_oop_map++; } } if (nonstatic_oop_map_count > 0) { if (this_oop_map + nonstatic_oop_map_count > last_oop_map) { // Calculated in compute_oop_map_size() number of oop maps is less then // collected oop maps since there is no gap between superklass's last oop // field and 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_length(this_oop_map->length() + *nonstatic_oop_length++); this_oop_map++; } assert((this_oop_map + nonstatic_oop_map_count) == last_oop_map, "just checking"); // Add new map blocks, fill them while (nonstatic_oop_map_count-- > 0) { this_oop_map->set_offset(*nonstatic_oop_offsets++); this_oop_map->set_length(*nonstatic_oop_length++); this_oop_map++; } } } void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) { klassOop 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->klass_part()->has_finalizer())) { k->set_has_finalizer(); } } #ifdef ASSERT bool f = false; methodOop m = k->lookup_method(vmSymbols::finalize_method_name(), vmSymbols::void_method_signature()); if (m != NULL && !m->is_empty_method()) { f = true; } 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 (Klass::cast(super)->has_vanilla_constructor() && _has_vanilla_constructor) { k->set_has_vanilla_constructor(); } #ifdef ASSERT bool v = false; if (Klass::cast(super)->has_vanilla_constructor()) { methodOop 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); } } // utility method for appending and array with check for duplicates void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) { // iterate over new interfaces for (int i = 0; i < ifs->length(); i++) { oop e = ifs->obj_at(i); assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking"); // check for duplicates bool duplicate = false; for (int j = 0; j < index; j++) { if (result->obj_at(j) == e) { duplicate = true; break; } } // add new interface if (!duplicate) { result->obj_at_put(index++, e); } } } objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle 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++) { klassOop l = klassOop(local_ifs->obj_at(i)); max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length(); } // Finally add local interfaces max_transitive_size += local_size; // Construct array objArrayHandle result; if (max_transitive_size == 0) { // no interfaces, use canonicalized array result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array()); } else if (max_transitive_size == super_size) { // no new local interfaces added, share superklass' transitive interface array result = objArrayHandle(THREAD, super->transitive_interfaces()); } else if (max_transitive_size == local_size) { // only local interfaces added, share local interface array result = local_ifs; } else { objArrayHandle nullHandle; objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle)); result = objArrayHandle(THREAD, new_objarray); int index = 0; // Copy down from superclass if (super.not_null()) { append_interfaces(result, index, super->transitive_interfaces()); } // Copy down from local interfaces' superinterfaces for (int i = 0; i < local_ifs->length(); i++) { klassOop l = klassOop(local_ifs->obj_at(i)); append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces()); } // Finally add local interfaces append_interfaces(result, index, local_ifs()); // Check if duplicates were removed if (index != max_transitive_size) { assert(index < max_transitive_size, "just checking"); objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle)); for (int i = 0; i < index; i++) { oop e = result->obj_at(i); assert(e != NULL, "just checking"); new_result->obj_at_put(i, e); } result = objArrayHandle(THREAD, new_result); } } return result; } void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) { klassOop super = this_klass->super(); if ((super != NULL) && (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbolHandles::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) { objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces()); int lng = local_interfaces->length(); for (int i = lng - 1; i >= 0; i--) { klassOop k = klassOop(local_interfaces->obj_at(i)); assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface"); if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbolHandles::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) { objArrayHandle methods (THREAD, 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++) { methodOop m = (methodOop)methods->obj_at(index); // skip private, static and <init> methods if ((!m->is_private()) && (!m->is_static()) && (m->name() != vmSymbols::object_initializer_name())) { symbolOop name = m->name(); symbolOop signature = m->signature(); klassOop k = this_klass->super(); methodOop super_m = NULL; while (k != NULL) { // skip supers that don't have final methods. if (k->klass_part()->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() && // matching method in super is final (Reflection::verify_field_access(this_klass->as_klassOop(), 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, vmSymbolHandles::java_lang_VerifyError(), "class %s overrides final method %s.%s", this_klass->external_name(), name->as_C_string(), signature->as_C_string() ); return; } // continue to look from super_m's holder's super. k = instanceKlass::cast(super_m->method_holder())->super(); continue; } k = k->klass_part()->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"); objArrayHandle methods (THREAD, this_klass->methods()); int num_methods = methods->length(); for (int index = 0; index < num_methods; index++) { methodOop m = (methodOop)methods->obj_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, vmSymbolHandles::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, vmSymbolHandles::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 = JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION : JAVA_6_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, vmSymbolHandles::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, symbolHandle 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 major_gte_15 = _major_version >= JAVA_1_5_VERSION; const bool is_initializer = (name == vmSymbols::object_initializer_name()); bool is_illegal = false; if (is_interface) { if (!is_abstract || !is_public || is_static || is_final || is_native || (major_gte_15 && (is_synchronized || is_strict))) { 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, vmSymbolHandles::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<count; k++) { unsigned char b0 = buffer[i]; unsigned char b1 = buffer[i+1]; unsigned char b2 = buffer[i+2]; unsigned char b3 = buffer[i+3]; // For an unsigned char v, // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128; // (v | v - 1) is >= 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(symbolHandle 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, vmSymbolHandles::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(symbolHandle 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, vmSymbolHandles::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(symbolHandle name, TRAPS) { if (!_need_verify || _relax_verify) { return; } assert(!name.is_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, vmSymbolHandles::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(symbolHandle name, symbolHandle 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) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbolHandles::java_lang_ClassFormatError(), "Field \"%s\" in class %s has illegal signature \"%s\"", name->as_C_string(), _class_name->as_C_string(), bytes ); return; } } // Checks if signature is a legal method signature. // Returns number of parameters int ClassFileParser::verify_legal_method_signature(symbolHandle name, symbolHandle 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 ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbolHandles::java_lang_ClassFormatError(), "Method \"%s\" in class %s has illegal signature \"%s\"", name->as_C_string(), _class_name->as_C_string(), p ); return 0; } // Unqualified names may not contain the characters '.', ';', or '/'. // Method names also may not contain the characters '<' or '>', unless <init> or <clinit>. // Note that method names may not be <init> or <clinit> 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 == ';') { 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::char_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, vmSymbolHandles::isJavaIdentifierStart_name(), vmSymbolHandles::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, vmSymbolHandles::isJavaIdentifierPart_name(), vmSymbolHandles::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; }