| /* |
| * Copyright 2005-2006 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/_jvmtiClassFileReconstituter.cpp.incl" |
| |
| // FIXME: add Deprecated, LVT, LVTT attributes |
| // FIXME: fix Synthetic attribute |
| // FIXME: per Serguei, add error return handling for constantPoolOopDesc::copy_cpool_bytes() |
| |
| |
| // Write the field information portion of ClassFile structure |
| // JVMSpec| u2 fields_count; |
| // JVMSpec| field_info fields[fields_count]; |
| void JvmtiClassFileReconstituter::write_field_infos() { |
| HandleMark hm(thread()); |
| typeArrayHandle fields(thread(), ikh()->fields()); |
| int fields_length = fields->length(); |
| int num_fields = fields_length / instanceKlass::next_offset; |
| objArrayHandle fields_anno(thread(), ikh()->fields_annotations()); |
| |
| write_u2(num_fields); |
| for (int index = 0; index < fields_length; index += instanceKlass::next_offset) { |
| AccessFlags access_flags; |
| int flags = fields->ushort_at(index + instanceKlass::access_flags_offset); |
| access_flags.set_flags(flags); |
| int name_index = fields->ushort_at(index + instanceKlass::name_index_offset); |
| int signature_index = fields->ushort_at(index + instanceKlass::signature_index_offset); |
| int initial_value_index = fields->ushort_at(index + instanceKlass::initval_index_offset); |
| guarantee(name_index != 0 && signature_index != 0, "bad constant pool index for field"); |
| int offset = ikh()->offset_from_fields( index ); |
| int generic_signature_index = |
| fields->ushort_at(index + instanceKlass::generic_signature_offset); |
| typeArrayHandle anno(thread(), fields_anno.not_null() ? |
| (typeArrayOop)(fields_anno->obj_at(index / instanceKlass::next_offset)) : |
| (typeArrayOop)NULL); |
| |
| // JVMSpec| field_info { |
| // JVMSpec| u2 access_flags; |
| // JVMSpec| u2 name_index; |
| // JVMSpec| u2 descriptor_index; |
| // JVMSpec| u2 attributes_count; |
| // JVMSpec| attribute_info attributes[attributes_count]; |
| // JVMSpec| } |
| |
| write_u2(flags & JVM_RECOGNIZED_FIELD_MODIFIERS); |
| write_u2(name_index); |
| write_u2(signature_index); |
| int attr_count = 0; |
| if (initial_value_index != 0) { |
| ++attr_count; |
| } |
| if (access_flags.is_synthetic()) { |
| // ++attr_count; |
| } |
| if (generic_signature_index != 0) { |
| ++attr_count; |
| } |
| if (anno.not_null()) { |
| ++attr_count; // has RuntimeVisibleAnnotations attribute |
| } |
| |
| write_u2(attr_count); |
| |
| if (initial_value_index != 0) { |
| write_attribute_name_index("ConstantValue"); |
| write_u4(2); //length always 2 |
| write_u2(initial_value_index); |
| } |
| if (access_flags.is_synthetic()) { |
| // write_synthetic_attribute(); |
| } |
| if (generic_signature_index != 0) { |
| write_signature_attribute(generic_signature_index); |
| } |
| if (anno.not_null()) { |
| write_annotations_attribute("RuntimeVisibleAnnotations", anno); |
| } |
| } |
| } |
| |
| // Write Code attribute |
| // JVMSpec| Code_attribute { |
| // JVMSpec| u2 attribute_name_index; |
| // JVMSpec| u4 attribute_length; |
| // JVMSpec| u2 max_stack; |
| // JVMSpec| u2 max_locals; |
| // JVMSpec| u4 code_length; |
| // JVMSpec| u1 code[code_length]; |
| // JVMSpec| u2 exception_table_length; |
| // JVMSpec| { u2 start_pc; |
| // JVMSpec| u2 end_pc; |
| // JVMSpec| u2 handler_pc; |
| // JVMSpec| u2 catch_type; |
| // JVMSpec| } exception_table[exception_table_length]; |
| // JVMSpec| u2 attributes_count; |
| // JVMSpec| attribute_info attributes[attributes_count]; |
| // JVMSpec| } |
| void JvmtiClassFileReconstituter::write_code_attribute(methodHandle method) { |
| constMethodHandle const_method(thread(), method->constMethod()); |
| u2 line_num_cnt = 0; |
| int stackmap_len = 0; |
| |
| // compute number and length of attributes -- FIXME: for now no LVT |
| int attr_count = 0; |
| int attr_size = 0; |
| if (const_method->has_linenumber_table()) { |
| line_num_cnt = line_number_table_entries(method); |
| if (line_num_cnt != 0) { |
| ++attr_count; |
| // Compute the complete size of the line number table attribute: |
| // LineNumberTable_attribute { |
| // u2 attribute_name_index; |
| // u4 attribute_length; |
| // u2 line_number_table_length; |
| // { u2 start_pc; |
| // u2 line_number; |
| // } line_number_table[line_number_table_length]; |
| // } |
| attr_size += 2 + 4 + 2 + line_num_cnt * (2 + 2); |
| } |
| } |
| if (method->has_stackmap_table()) { |
| stackmap_len = method->stackmap_data()->length(); |
| if (stackmap_len != 0) { |
| ++attr_count; |
| // Compute the size of the stack map table attribute (VM stores raw): |
| // StackMapTable_attribute { |
| // u2 attribute_name_index; |
| // u4 attribute_length; |
| // u2 number_of_entries; |
| // stack_map_frame_entries[number_of_entries]; |
| // } |
| attr_size += 2 + 4 + stackmap_len; |
| } |
| } |
| |
| typeArrayHandle exception_table(thread(), const_method->exception_table()); |
| int exception_table_length = exception_table->length(); |
| int exception_table_entries = exception_table_length / 4; |
| int code_size = const_method->code_size(); |
| int size = |
| 2+2+4 + // max_stack, max_locals, code_length |
| code_size + // code |
| 2 + // exception_table_length |
| (2+2+2+2) * exception_table_entries + // exception_table |
| 2 + // attributes_count |
| attr_size; // attributes |
| |
| write_attribute_name_index("Code"); |
| write_u4(size); |
| write_u2(method->max_stack()); |
| write_u2(method->max_locals()); |
| write_u4(code_size); |
| copy_bytecodes(method, (unsigned char*)writeable_address(code_size)); |
| write_u2(exception_table_entries); |
| for (int index = 0; index < exception_table_length; ) { |
| write_u2(exception_table->int_at(index++)); |
| write_u2(exception_table->int_at(index++)); |
| write_u2(exception_table->int_at(index++)); |
| write_u2(exception_table->int_at(index++)); |
| } |
| write_u2(attr_count); |
| if (line_num_cnt != 0) { |
| write_line_number_table_attribute(method, line_num_cnt); |
| } |
| if (stackmap_len != 0) { |
| write_stackmap_table_attribute(method, stackmap_len); |
| } |
| |
| // FIXME: write LVT attribute |
| } |
| |
| // Write Exceptions attribute |
| // JVMSpec| Exceptions_attribute { |
| // JVMSpec| u2 attribute_name_index; |
| // JVMSpec| u4 attribute_length; |
| // JVMSpec| u2 number_of_exceptions; |
| // JVMSpec| u2 exception_index_table[number_of_exceptions]; |
| // JVMSpec| } |
| void JvmtiClassFileReconstituter::write_exceptions_attribute(constMethodHandle const_method) { |
| CheckedExceptionElement* checked_exceptions = const_method->checked_exceptions_start(); |
| int checked_exceptions_length = const_method->checked_exceptions_length(); |
| int size = |
| 2 + // number_of_exceptions |
| 2 * checked_exceptions_length; // exception_index_table |
| |
| write_attribute_name_index("Exceptions"); |
| write_u4(size); |
| write_u2(checked_exceptions_length); |
| for (int index = 0; index < checked_exceptions_length; index++) { |
| write_u2(checked_exceptions[index].class_cp_index); |
| } |
| } |
| |
| // Write SourceFile attribute |
| // JVMSpec| SourceFile_attribute { |
| // JVMSpec| u2 attribute_name_index; |
| // JVMSpec| u4 attribute_length; |
| // JVMSpec| u2 sourcefile_index; |
| // JVMSpec| } |
| void JvmtiClassFileReconstituter::write_source_file_attribute() { |
| assert(ikh()->source_file_name() != NULL, "caller must check"); |
| |
| write_attribute_name_index("SourceFile"); |
| write_u4(2); // always length 2 |
| write_u2(symbol_to_cpool_index(ikh()->source_file_name())); |
| } |
| |
| // Write SourceDebugExtension attribute |
| // JSR45| SourceDebugExtension_attribute { |
| // JSR45| u2 attribute_name_index; |
| // JSR45| u4 attribute_length; |
| // JSR45| u2 sourcefile_index; |
| // JSR45| } |
| void JvmtiClassFileReconstituter::write_source_debug_extension_attribute() { |
| assert(ikh()->source_debug_extension() != NULL, "caller must check"); |
| |
| write_attribute_name_index("SourceDebugExtension"); |
| write_u4(2); // always length 2 |
| write_u2(symbol_to_cpool_index(ikh()->source_debug_extension())); |
| } |
| |
| // Write (generic) Signature attribute |
| // JVMSpec| Signature_attribute { |
| // JVMSpec| u2 attribute_name_index; |
| // JVMSpec| u4 attribute_length; |
| // JVMSpec| u2 signature_index; |
| // JVMSpec| } |
| void JvmtiClassFileReconstituter::write_signature_attribute(u2 generic_signature_index) { |
| write_attribute_name_index("Signature"); |
| write_u4(2); // always length 2 |
| write_u2(generic_signature_index); |
| } |
| |
| // Compute the number of entries in the InnerClasses attribute |
| u2 JvmtiClassFileReconstituter::inner_classes_attribute_length() { |
| typeArrayOop inner_class_list = ikh()->inner_classes(); |
| return (inner_class_list == NULL) ? 0 : inner_class_list->length(); |
| } |
| |
| // Write an annotation attribute. The VM stores them in raw form, so all we need |
| // to do is add the attrubute name and fill in the length. |
| // JSR202| *Annotations_attribute { |
| // JSR202| u2 attribute_name_index; |
| // JSR202| u4 attribute_length; |
| // JSR202| ... |
| // JSR202| } |
| void JvmtiClassFileReconstituter::write_annotations_attribute(const char* attr_name, |
| typeArrayHandle annos) { |
| u4 length = annos->length(); |
| write_attribute_name_index(attr_name); |
| write_u4(length); |
| memcpy(writeable_address(length), annos->byte_at_addr(0), length); |
| } |
| |
| |
| // Write InnerClasses attribute |
| // JVMSpec| InnerClasses_attribute { |
| // JVMSpec| u2 attribute_name_index; |
| // JVMSpec| u4 attribute_length; |
| // JVMSpec| u2 number_of_classes; |
| // JVMSpec| { u2 inner_class_info_index; |
| // JVMSpec| u2 outer_class_info_index; |
| // JVMSpec| u2 inner_name_index; |
| // JVMSpec| u2 inner_class_access_flags; |
| // JVMSpec| } classes[number_of_classes]; |
| // JVMSpec| } |
| void JvmtiClassFileReconstituter::write_inner_classes_attribute(int length) { |
| typeArrayOop inner_class_list = ikh()->inner_classes(); |
| guarantee(inner_class_list != NULL && inner_class_list->length() == length, |
| "caller must check"); |
| typeArrayHandle inner_class_list_h(thread(), inner_class_list); |
| assert (length % instanceKlass::inner_class_next_offset == 0, "just checking"); |
| u2 entry_count = length / instanceKlass::inner_class_next_offset; |
| u4 size = 2 + entry_count * (2+2+2+2); |
| |
| write_attribute_name_index("InnerClasses"); |
| write_u4(size); |
| write_u2(entry_count); |
| for (int i = 0; i < length; i += instanceKlass::inner_class_next_offset) { |
| write_u2(inner_class_list_h->ushort_at( |
| i + instanceKlass::inner_class_inner_class_info_offset)); |
| write_u2(inner_class_list_h->ushort_at( |
| i + instanceKlass::inner_class_outer_class_info_offset)); |
| write_u2(inner_class_list_h->ushort_at( |
| i + instanceKlass::inner_class_inner_name_offset)); |
| write_u2(inner_class_list_h->ushort_at( |
| i + instanceKlass::inner_class_access_flags_offset)); |
| } |
| } |
| |
| // Write Synthetic attribute |
| // JVMSpec| Synthetic_attribute { |
| // JVMSpec| u2 attribute_name_index; |
| // JVMSpec| u4 attribute_length; |
| // JVMSpec| } |
| void JvmtiClassFileReconstituter::write_synthetic_attribute() { |
| write_attribute_name_index("Synthetic"); |
| write_u4(0); //length always zero |
| } |
| |
| // Compute size of LineNumberTable |
| u2 JvmtiClassFileReconstituter::line_number_table_entries(methodHandle method) { |
| // The line number table is compressed so we don't know how big it is until decompressed. |
| // Decompression is really fast so we just do it twice. |
| u2 num_entries = 0; |
| CompressedLineNumberReadStream stream(method->compressed_linenumber_table()); |
| while (stream.read_pair()) { |
| num_entries++; |
| } |
| return num_entries; |
| } |
| |
| // Write LineNumberTable attribute |
| // JVMSpec| LineNumberTable_attribute { |
| // JVMSpec| u2 attribute_name_index; |
| // JVMSpec| u4 attribute_length; |
| // JVMSpec| u2 line_number_table_length; |
| // JVMSpec| { u2 start_pc; |
| // JVMSpec| u2 line_number; |
| // JVMSpec| } line_number_table[line_number_table_length]; |
| // JVMSpec| } |
| void JvmtiClassFileReconstituter::write_line_number_table_attribute(methodHandle method, |
| u2 num_entries) { |
| |
| write_attribute_name_index("LineNumberTable"); |
| write_u4(2 + num_entries * (2 + 2)); |
| write_u2(num_entries); |
| |
| CompressedLineNumberReadStream stream(method->compressed_linenumber_table()); |
| while (stream.read_pair()) { |
| write_u2(stream.bci()); |
| write_u2(stream.line()); |
| } |
| } |
| |
| // Write stack map table attribute |
| // JSR-202| StackMapTable_attribute { |
| // JSR-202| u2 attribute_name_index; |
| // JSR-202| u4 attribute_length; |
| // JSR-202| u2 number_of_entries; |
| // JSR-202| stack_map_frame_entries[number_of_entries]; |
| // JSR-202| } |
| void JvmtiClassFileReconstituter::write_stackmap_table_attribute(methodHandle method, |
| int stackmap_len) { |
| |
| write_attribute_name_index("StackMapTable"); |
| write_u4(stackmap_len); |
| memcpy( |
| writeable_address(stackmap_len), |
| (void*)(method->stackmap_data()->byte_at_addr(0)), |
| stackmap_len); |
| } |
| |
| // Write one method_info structure |
| // JVMSpec| method_info { |
| // JVMSpec| u2 access_flags; |
| // JVMSpec| u2 name_index; |
| // JVMSpec| u2 descriptor_index; |
| // JVMSpec| u2 attributes_count; |
| // JVMSpec| attribute_info attributes[attributes_count]; |
| // JVMSpec| } |
| void JvmtiClassFileReconstituter::write_method_info(methodHandle method) { |
| AccessFlags access_flags = method->access_flags(); |
| constMethodHandle const_method(thread(), method->constMethod()); |
| u2 generic_signature_index = const_method->generic_signature_index(); |
| typeArrayHandle anno(thread(), method->annotations()); |
| typeArrayHandle param_anno(thread(), method->parameter_annotations()); |
| typeArrayHandle default_anno(thread(), method->annotation_default()); |
| |
| write_u2(access_flags.get_flags() & JVM_RECOGNIZED_METHOD_MODIFIERS); |
| write_u2(const_method->name_index()); |
| write_u2(const_method->signature_index()); |
| |
| // write attributes in the same order javac does, so we can test with byte for |
| // byte comparison |
| int attr_count = 0; |
| if (const_method->code_size() != 0) { |
| ++attr_count; // has Code attribute |
| } |
| if (const_method->has_checked_exceptions()) { |
| ++attr_count; // has Exceptions attribute |
| } |
| if (default_anno.not_null()) { |
| ++attr_count; // has AnnotationDefault attribute |
| } |
| // Deprecated attribute would go here |
| if (access_flags.is_synthetic()) { // FIXME |
| // ++attr_count; |
| } |
| if (generic_signature_index != 0) { |
| ++attr_count; |
| } |
| if (anno.not_null()) { |
| ++attr_count; // has RuntimeVisibleAnnotations attribute |
| } |
| if (param_anno.not_null()) { |
| ++attr_count; // has RuntimeVisibleParameterAnnotations attribute |
| } |
| |
| write_u2(attr_count); |
| if (const_method->code_size() > 0) { |
| write_code_attribute(method); |
| } |
| if (const_method->has_checked_exceptions()) { |
| write_exceptions_attribute(const_method); |
| } |
| if (default_anno.not_null()) { |
| write_annotations_attribute("AnnotationDefault", default_anno); |
| } |
| // Deprecated attribute would go here |
| if (access_flags.is_synthetic()) { |
| // write_synthetic_attribute(); |
| } |
| if (generic_signature_index != 0) { |
| write_signature_attribute(generic_signature_index); |
| } |
| if (anno.not_null()) { |
| write_annotations_attribute("RuntimeVisibleAnnotations", anno); |
| } |
| if (param_anno.not_null()) { |
| write_annotations_attribute("RuntimeVisibleParameterAnnotations", param_anno); |
| } |
| } |
| |
| // Write the class attributes portion of ClassFile structure |
| // JVMSpec| u2 attributes_count; |
| // JVMSpec| attribute_info attributes[attributes_count]; |
| void JvmtiClassFileReconstituter::write_class_attributes() { |
| u2 inner_classes_length = inner_classes_attribute_length(); |
| symbolHandle generic_signature(thread(), ikh()->generic_signature()); |
| typeArrayHandle anno(thread(), ikh()->class_annotations()); |
| |
| int attr_count = 0; |
| if (generic_signature() != NULL) { |
| ++attr_count; |
| } |
| if (ikh()->source_file_name() != NULL) { |
| ++attr_count; |
| } |
| if (ikh()->source_debug_extension() != NULL) { |
| ++attr_count; |
| } |
| if (inner_classes_length > 0) { |
| ++attr_count; |
| } |
| if (anno.not_null()) { |
| ++attr_count; // has RuntimeVisibleAnnotations attribute |
| } |
| |
| write_u2(attr_count); |
| |
| if (generic_signature() != NULL) { |
| write_signature_attribute(symbol_to_cpool_index(generic_signature())); |
| } |
| if (ikh()->source_file_name() != NULL) { |
| write_source_file_attribute(); |
| } |
| if (ikh()->source_debug_extension() != NULL) { |
| write_source_debug_extension_attribute(); |
| } |
| if (inner_classes_length > 0) { |
| write_inner_classes_attribute(inner_classes_length); |
| } |
| if (anno.not_null()) { |
| write_annotations_attribute("RuntimeVisibleAnnotations", anno); |
| } |
| } |
| |
| // Write the method information portion of ClassFile structure |
| // JVMSpec| u2 methods_count; |
| // JVMSpec| method_info methods[methods_count]; |
| void JvmtiClassFileReconstituter::write_method_infos() { |
| HandleMark hm(thread()); |
| objArrayHandle methods(thread(), ikh()->methods()); |
| int num_methods = methods->length(); |
| |
| write_u2(num_methods); |
| if (JvmtiExport::can_maintain_original_method_order()) { |
| int index; |
| int original_index; |
| int* method_order = NEW_RESOURCE_ARRAY(int, num_methods); |
| |
| // invert the method order mapping |
| for (index = 0; index < num_methods; index++) { |
| original_index = ikh()->method_ordering()->int_at(index); |
| assert(original_index >= 0 && original_index < num_methods, |
| "invalid original method index"); |
| method_order[original_index] = index; |
| } |
| |
| // write in original order |
| for (original_index = 0; original_index < num_methods; original_index++) { |
| index = method_order[original_index]; |
| methodHandle method(thread(), (methodOop)(ikh()->methods()->obj_at(index))); |
| write_method_info(method); |
| } |
| } else { |
| // method order not preserved just dump the method infos |
| for (int index = 0; index < num_methods; index++) { |
| methodHandle method(thread(), (methodOop)(ikh()->methods()->obj_at(index))); |
| write_method_info(method); |
| } |
| } |
| } |
| |
| void JvmtiClassFileReconstituter::write_class_file_format() { |
| ReallocMark(); |
| |
| // JVMSpec| ClassFile { |
| // JVMSpec| u4 magic; |
| write_u4(0xCAFEBABE); |
| |
| // JVMSpec| u2 minor_version; |
| // JVMSpec| u2 major_version; |
| write_u2(ikh()->minor_version()); |
| u2 major = ikh()->major_version(); |
| write_u2(major); |
| |
| // JVMSpec| u2 constant_pool_count; |
| // JVMSpec| cp_info constant_pool[constant_pool_count-1]; |
| write_u2(cpool()->length()); |
| copy_cpool_bytes(writeable_address(cpool_size())); |
| |
| // JVMSpec| u2 access_flags; |
| write_u2(ikh()->access_flags().get_flags() & JVM_RECOGNIZED_CLASS_MODIFIERS); |
| |
| // JVMSpec| u2 this_class; |
| // JVMSpec| u2 super_class; |
| write_u2(class_symbol_to_cpool_index(ikh()->name())); |
| klassOop super_class = ikh()->super(); |
| write_u2(super_class == NULL? 0 : // zero for java.lang.Object |
| class_symbol_to_cpool_index(super_class->klass_part()->name())); |
| |
| // JVMSpec| u2 interfaces_count; |
| // JVMSpec| u2 interfaces[interfaces_count]; |
| objArrayHandle interfaces(thread(), ikh()->local_interfaces()); |
| int num_interfaces = interfaces->length(); |
| write_u2(num_interfaces); |
| for (int index = 0; index < num_interfaces; index++) { |
| HandleMark hm(thread()); |
| instanceKlassHandle iikh(thread(), klassOop(interfaces->obj_at(index))); |
| write_u2(class_symbol_to_cpool_index(iikh->name())); |
| } |
| |
| // JVMSpec| u2 fields_count; |
| // JVMSpec| field_info fields[fields_count]; |
| write_field_infos(); |
| |
| // JVMSpec| u2 methods_count; |
| // JVMSpec| method_info methods[methods_count]; |
| write_method_infos(); |
| |
| // JVMSpec| u2 attributes_count; |
| // JVMSpec| attribute_info attributes[attributes_count]; |
| // JVMSpec| } /* end ClassFile 8? |
| write_class_attributes(); |
| } |
| |
| address JvmtiClassFileReconstituter::writeable_address(size_t size) { |
| size_t used_size = _buffer_ptr - _buffer; |
| if (size + used_size >= _buffer_size) { |
| // compute the new buffer size: must be at least twice as big as before |
| // plus whatever new is being used; then convert to nice clean block boundary |
| size_t new_buffer_size = (size + _buffer_size*2 + 1) / initial_buffer_size |
| * initial_buffer_size; |
| |
| // VM goes belly-up if the memory isn't available, so cannot do OOM processing |
| _buffer = REALLOC_RESOURCE_ARRAY(u1, _buffer, _buffer_size, new_buffer_size); |
| _buffer_size = new_buffer_size; |
| _buffer_ptr = _buffer + used_size; |
| } |
| u1* ret_ptr = _buffer_ptr; |
| _buffer_ptr += size; |
| return ret_ptr; |
| } |
| |
| void JvmtiClassFileReconstituter::write_attribute_name_index(const char* name) { |
| unsigned int hash_ignored; |
| symbolOop sym = SymbolTable::lookup_only(name, (int)strlen(name), hash_ignored); |
| assert(sym != NULL, "attribute name symbol not found"); |
| u2 attr_name_index = symbol_to_cpool_index(sym); |
| assert(attr_name_index != 0, "attribute name symbol not in constant pool"); |
| write_u2(attr_name_index); |
| } |
| |
| void JvmtiClassFileReconstituter::write_u1(u1 x) { |
| *writeable_address(1) = x; |
| } |
| |
| void JvmtiClassFileReconstituter::write_u2(u2 x) { |
| Bytes::put_Java_u2(writeable_address(2), x); |
| } |
| |
| void JvmtiClassFileReconstituter::write_u4(u4 x) { |
| Bytes::put_Java_u4(writeable_address(4), x); |
| } |
| |
| void JvmtiClassFileReconstituter::write_u8(u8 x) { |
| Bytes::put_Java_u8(writeable_address(8), x); |
| } |
| |
| void JvmtiClassFileReconstituter::copy_bytecodes(methodHandle mh, |
| unsigned char* bytecodes) { |
| // use a BytecodeStream to iterate over the bytecodes. JVM/fast bytecodes |
| // and the breakpoint bytecode are converted to their original bytecodes. |
| |
| BytecodeStream bs(mh); |
| |
| unsigned char* p = bytecodes; |
| Bytecodes::Code code; |
| bool is_rewritten = instanceKlass::cast(mh->method_holder())->is_rewritten(); |
| |
| while ((code = bs.next()) >= 0) { |
| assert(Bytecodes::is_java_code(code), "sanity check"); |
| assert(code != Bytecodes::_breakpoint, "sanity check"); |
| |
| // length of bytecode (mnemonic + operands) |
| address bcp = bs.bcp(); |
| int len = bs.next_bcp() - bcp; |
| assert(len > 0, "length must be > 0"); |
| |
| // copy the bytecodes |
| *p = (unsigned char) (bs.is_wide()? Bytecodes::_wide : code); |
| if (len > 1) { |
| memcpy(p+1, bcp+1, len-1); |
| } |
| |
| // During linking the get/put and invoke instructions are rewritten |
| // with an index into the constant pool cache. The original constant |
| // pool index must be returned to caller. Rewrite the index. |
| if (is_rewritten && len >= 3) { |
| switch (code) { |
| case Bytecodes::_getstatic : // fall through |
| case Bytecodes::_putstatic : // fall through |
| case Bytecodes::_getfield : // fall through |
| case Bytecodes::_putfield : // fall through |
| case Bytecodes::_invokevirtual : // fall through |
| case Bytecodes::_invokespecial : // fall through |
| case Bytecodes::_invokestatic : // fall through |
| case Bytecodes::_invokedynamic : // fall through |
| case Bytecodes::_invokeinterface : |
| assert(len == 3 || (code == Bytecodes::_invokeinterface && len ==5), |
| "sanity check"); |
| int cpci = Bytes::get_native_u2(bcp+1); |
| bool is_invokedynamic = (EnableInvokeDynamic && code == Bytecodes::_invokedynamic); |
| if (is_invokedynamic) |
| cpci = Bytes::get_native_u4(bcp+1); |
| // cache cannot be pre-fetched since some classes won't have it yet |
| ConstantPoolCacheEntry* entry = |
| mh->constants()->cache()->main_entry_at(cpci); |
| int i = entry->constant_pool_index(); |
| assert(i < mh->constants()->length(), "sanity check"); |
| Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering |
| if (is_invokedynamic) *(p+3) = *(p+4) = 0; |
| break; |
| } |
| } |
| |
| p += len; |
| } |
| } |
