Mercurial > hg > graal-compiler
view src/share/vm/prims/jvmtiClassFileReconstituter.cpp @ 10566:a6632ef9c84d
GPU generate_kernel return for Cuda function
author | Morris Meyer <morris.meyer@oracle.com> |
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date | Thu, 27 Jun 2013 19:57:43 -0400 |
parents | b5fef8013a95 |
children | de6a9e811145 |
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/* * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "precompiled.hpp" #include "classfile/symbolTable.hpp" #include "interpreter/bytecodeStream.hpp" #include "oops/fieldStreams.hpp" #include "prims/jvmtiClassFileReconstituter.hpp" #include "runtime/signature.hpp" #ifdef TARGET_ARCH_x86 # include "bytes_x86.hpp" #endif #ifdef TARGET_ARCH_sparc # include "bytes_sparc.hpp" #endif #ifdef TARGET_ARCH_zero # include "bytes_zero.hpp" #endif #ifdef TARGET_ARCH_arm # include "bytes_arm.hpp" #endif #ifdef TARGET_ARCH_ppc # include "bytes_ppc.hpp" #endif // FIXME: add Deprecated attribute // FIXME: fix Synthetic attribute // FIXME: per Serguei, add error return handling for ConstantPool::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()); Array<AnnotationArray*>* fields_anno = ikh()->fields_annotations(); // Compute the real number of Java fields int java_fields = ikh()->java_fields_count(); write_u2(java_fields); for (JavaFieldStream fs(ikh()); !fs.done(); fs.next()) { AccessFlags access_flags = fs.access_flags(); int name_index = fs.name_index(); int signature_index = fs.signature_index(); int initial_value_index = fs.initval_index(); guarantee(name_index != 0 && signature_index != 0, "bad constant pool index for field"); // int offset = ikh()->field_offset( index ); int generic_signature_index = fs.generic_signature_index(); AnnotationArray* anno = fields_anno == NULL ? NULL : fields_anno->at(fs.index()); // 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(access_flags.as_int() & 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 != 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 != 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) { ConstMethod* const_method = method->constMethod(); u2 line_num_cnt = 0; int stackmap_len = 0; int local_variable_table_length = 0; int local_variable_type_table_length = 0; // compute number and length of attributes 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; } } if (method->has_localvariable_table()) { local_variable_table_length = method->localvariable_table_length(); if (local_variable_table_length != 0) { ++attr_count; // Compute the size of the local variable table attribute (VM stores raw): // LocalVariableTable_attribute { // u2 attribute_name_index; // u4 attribute_length; // u2 local_variable_table_length; // { // u2 start_pc; // u2 length; // u2 name_index; // u2 descriptor_index; // u2 index; // } attr_size += 2 + 4 + 2 + local_variable_table_length * (2 + 2 + 2 + 2 + 2); // Local variables with generic signatures must have LVTT entries LocalVariableTableElement *elem = method->localvariable_table_start(); for (int idx = 0; idx < local_variable_table_length; idx++) { if (elem[idx].signature_cp_index != 0) { local_variable_type_table_length++; } } if (local_variable_type_table_length != 0) { ++attr_count; // Compute the size of the local variable type table attribute (VM stores raw): // LocalVariableTypeTable_attribute { // u2 attribute_name_index; // u4 attribute_length; // u2 local_variable_type_table_length; // { // u2 start_pc; // u2 length; // u2 name_index; // u2 signature_index; // u2 index; // } attr_size += 2 + 4 + 2 + local_variable_type_table_length * (2 + 2 + 2 + 2 + 2); } } } ExceptionTable exception_table(method()); int exception_table_length = exception_table.length(); 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_length + // exception_table 2 + // attributes_count attr_size; // attributes write_attribute_name_index("Code"); write_u4(size); write_u2(method->verifier_max_stack()); write_u2(method->max_locals()); write_u4(code_size); copy_bytecodes(method, (unsigned char*)writeable_address(code_size)); write_u2(exception_table_length); for (int index = 0; index < exception_table_length; index++) { write_u2(exception_table.start_pc(index)); write_u2(exception_table.end_pc(index)); write_u2(exception_table.handler_pc(index)); write_u2(exception_table.catch_type_index(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); } if (local_variable_table_length != 0) { write_local_variable_table_attribute(method, local_variable_table_length); } if (local_variable_type_table_length != 0) { write_local_variable_type_table_attribute(method, local_variable_type_table_length); } } // 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(ConstMethod* 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| u1 debug_extension[attribute_length]; // JSR45| } void JvmtiClassFileReconstituter::write_source_debug_extension_attribute() { assert(ikh()->source_debug_extension() != NULL, "caller must check"); write_attribute_name_index("SourceDebugExtension"); int len = (int)strlen(ikh()->source_debug_extension()); write_u4(len); u1* ext = (u1*)ikh()->source_debug_extension(); for (int i=0; i<len; i++) { write_u1(ext[i]); } } // 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() { InnerClassesIterator iter(ikh()); return iter.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, AnnotationArray* annos) { u4 length = annos->length(); write_attribute_name_index(attr_name); write_u4(length); memcpy(writeable_address(length), annos->adr_at(0), length); } // BootstrapMethods_attribute { // u2 attribute_name_index; // u4 attribute_length; // u2 num_bootstrap_methods; // { u2 bootstrap_method_ref; // u2 num_bootstrap_arguments; // u2 bootstrap_arguments[num_bootstrap_arguments]; // } bootstrap_methods[num_bootstrap_methods]; // } void JvmtiClassFileReconstituter::write_bootstrapmethod_attribute() { Array<u2>* operands = cpool()->operands(); write_attribute_name_index("BootstrapMethods"); int num_bootstrap_methods = ConstantPool::operand_array_length(operands); // calculate length of attribute int length = sizeof(u2); // num_bootstrap_methods for (int n = 0; n < num_bootstrap_methods; n++) { u2 num_bootstrap_arguments = cpool()->operand_argument_count_at(n); length += sizeof(u2); // bootstrap_method_ref length += sizeof(u2); // num_bootstrap_arguments length += sizeof(u2) * num_bootstrap_arguments; // bootstrap_arguments[num_bootstrap_arguments] } write_u4(length); // write attribute write_u2(num_bootstrap_methods); for (int n = 0; n < num_bootstrap_methods; n++) { u2 bootstrap_method_ref = cpool()->operand_bootstrap_method_ref_index_at(n); u2 num_bootstrap_arguments = cpool()->operand_argument_count_at(n); write_u2(bootstrap_method_ref); write_u2(num_bootstrap_arguments); for (int arg = 0; arg < num_bootstrap_arguments; arg++) { u2 bootstrap_argument = cpool()->operand_argument_index_at(n, arg); write_u2(bootstrap_argument); } } } // 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) { InnerClassesIterator iter(ikh()); guarantee(iter.length() != 0 && iter.length() == length, "caller must check"); 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 (; !iter.done(); iter.next()) { write_u2(iter.inner_class_info_index()); write_u2(iter.outer_class_info_index()); write_u2(iter.inner_name_index()); write_u2(iter.inner_access_flags()); } } // 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 LocalVariableTable attribute // JVMSpec| LocalVariableTable_attribute { // JVMSpec| u2 attribute_name_index; // JVMSpec| u4 attribute_length; // JVMSpec| u2 local_variable_table_length; // JVMSpec| { u2 start_pc; // JVMSpec| u2 length; // JVMSpec| u2 name_index; // JVMSpec| u2 descriptor_index; // JVMSpec| u2 index; // JVMSpec| } local_variable_table[local_variable_table_length]; // JVMSpec| } void JvmtiClassFileReconstituter::write_local_variable_table_attribute(methodHandle method, u2 num_entries) { write_attribute_name_index("LocalVariableTable"); write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2)); write_u2(num_entries); assert(method->localvariable_table_length() == num_entries, "just checking"); LocalVariableTableElement *elem = method->localvariable_table_start(); for (int j=0; j<method->localvariable_table_length(); j++) { write_u2(elem->start_bci); write_u2(elem->length); write_u2(elem->name_cp_index); write_u2(elem->descriptor_cp_index); write_u2(elem->slot); elem++; } } // Write LocalVariableTypeTable attribute // JVMSpec| LocalVariableTypeTable_attribute { // JVMSpec| u2 attribute_name_index; // JVMSpec| u4 attribute_length; // JVMSpec| u2 local_variable_type_table_length; // JVMSpec| { u2 start_pc; // JVMSpec| u2 length; // JVMSpec| u2 name_index; // JVMSpec| u2 signature_index; // JVMSpec| u2 index; // JVMSpec| } local_variable_type_table[local_variable_type_table_length]; // JVMSpec| } void JvmtiClassFileReconstituter::write_local_variable_type_table_attribute(methodHandle method, u2 num_entries) { write_attribute_name_index("LocalVariableTypeTable"); write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2)); write_u2(num_entries); LocalVariableTableElement *elem = method->localvariable_table_start(); for (int j=0; j<method->localvariable_table_length(); j++) { if (elem->signature_cp_index > 0) { // Local variable has a generic signature - write LVTT attribute entry write_u2(elem->start_bci); write_u2(elem->length); write_u2(elem->name_cp_index); write_u2(elem->signature_cp_index); write_u2(elem->slot); num_entries--; } elem++; } assert(num_entries == 0, "just checking"); } // 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()->adr_at(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(); ConstMethod* const_method = method->constMethod(); u2 generic_signature_index = const_method->generic_signature_index(); AnnotationArray* anno = method->annotations(); AnnotationArray* param_anno = method->parameter_annotations(); AnnotationArray* default_anno = method->annotation_default(); // skip generated default interface methods if (method->is_overpass()) { return; } 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 != 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 != NULL) { ++attr_count; // has RuntimeVisibleAnnotations attribute } if (param_anno != 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 != 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 != NULL) { write_annotations_attribute("RuntimeVisibleAnnotations", anno); } if (param_anno != 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(); Symbol* generic_signature = ikh()->generic_signature(); AnnotationArray* anno = 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 != NULL) { ++attr_count; // has RuntimeVisibleAnnotations attribute } if (cpool()->operands() != NULL) { ++attr_count; } 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 != NULL) { write_annotations_attribute("RuntimeVisibleAnnotations", anno); } if (cpool()->operands() != NULL) { write_bootstrapmethod_attribute(); } } // 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()); Array<Method*>* methods = ikh()->methods(); int num_methods = methods->length(); int num_overpass = 0; // count the generated default interface methods // these will not be re-created by write_method_info // and should not be included in the total count for (int index = 0; index < num_methods; index++) { Method* method = methods->at(index); if (method->is_overpass()) { num_overpass++; } } write_u2(num_methods - num_overpass); if (JvmtiExport::can_maintain_original_method_order()) { int index; int original_index; intArray method_order(num_methods, 0); // invert the method order mapping for (index = 0; index < num_methods; index++) { original_index = ikh()->method_ordering()->at(index); assert(original_index >= 0 && original_index < num_methods, "invalid original method index"); method_order.at_put(original_index, index); } // write in original order for (original_index = 0; original_index < num_methods; original_index++) { index = method_order.at(original_index); methodHandle method(thread(), methods->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(), methods->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())); Klass* super_class = ikh()->super(); write_u2(super_class == NULL? 0 : // zero for java.lang.Object class_symbol_to_cpool_index(super_class->name())); // JVMSpec| u2 interfaces_count; // JVMSpec| u2 interfaces[interfaces_count]; Array<Klass*>* interfaces = 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(), interfaces->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) { TempNewSymbol sym = SymbolTable::probe(name, (int)strlen(name)); 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 = 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.instruction_size(); 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 > 1) { bool is_wide = false; 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) || (code == Bytecodes::_invokedynamic && len == 5), "sanity check"); int cpci = Bytes::get_native_u2(bcp+1); bool is_invokedynamic = (EnableInvokeDynamic && code == Bytecodes::_invokedynamic); ConstantPoolCacheEntry* entry; if (is_invokedynamic) { cpci = Bytes::get_native_u4(bcp+1); entry = mh->constants()->invokedynamic_cp_cache_entry_at(cpci); } else { // cache cannot be pre-fetched since some classes won't have it yet entry = mh->constants()->cache()->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; } case Bytecodes::_ldc_w: is_wide = true; // fall through case Bytecodes::_ldc: { if (bs.raw_code() == Bytecodes::_fast_aldc || bs.raw_code() == Bytecodes::_fast_aldc_w) { int cpci = is_wide ? Bytes::get_native_u2(bcp+1) : (u1)(*(bcp+1)); int i = mh->constants()->object_to_cp_index(cpci); assert(i < mh->constants()->length(), "sanity check"); if (is_wide) { Bytes::put_Java_u2((address)(p+1), (u2)i); // java byte ordering } else { *(p+1) = (u1)i; } } break; } } } p += len; } }