duke@435: /*
duke@435:  * Copyright 2005-2006 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: # include "incls/_precompiled.incl"
duke@435: # include "incls/_jvmtiClassFileReconstituter.cpp.incl"
duke@435: 
duke@435: // FIXME: add Deprecated, LVT, LVTT attributes
duke@435: // FIXME: fix Synthetic attribute
duke@435: // FIXME: per Serguei, add error return handling for constantPoolOopDesc::copy_cpool_bytes()
duke@435: 
duke@435: 
duke@435: // Write the field information portion of ClassFile structure
duke@435: // JVMSpec|     u2 fields_count;
duke@435: // JVMSpec|     field_info fields[fields_count];
duke@435: void JvmtiClassFileReconstituter::write_field_infos() {
duke@435:   HandleMark hm(thread());
duke@435:   typeArrayHandle fields(thread(), ikh()->fields());
duke@435:   int fields_length = fields->length();
duke@435:   int num_fields = fields_length / instanceKlass::next_offset;
duke@435:   objArrayHandle fields_anno(thread(), ikh()->fields_annotations());
duke@435: 
duke@435:   write_u2(num_fields);
duke@435:   for (int index = 0; index < fields_length; index += instanceKlass::next_offset) {
duke@435:     AccessFlags access_flags;
duke@435:     int flags = fields->ushort_at(index + instanceKlass::access_flags_offset);
duke@435:     access_flags.set_flags(flags);
duke@435:     int name_index = fields->ushort_at(index + instanceKlass::name_index_offset);
duke@435:     int signature_index = fields->ushort_at(index + instanceKlass::signature_index_offset);
duke@435:     int initial_value_index = fields->ushort_at(index + instanceKlass::initval_index_offset);
duke@435:     guarantee(name_index != 0 && signature_index != 0, "bad constant pool index for field");
duke@435:     int offset = ikh()->offset_from_fields( index );
duke@435:     int generic_signature_index =
duke@435:                         fields->ushort_at(index + instanceKlass::generic_signature_offset);
duke@435:     typeArrayHandle anno(thread(), fields_anno.not_null() ?
duke@435:                                  (typeArrayOop)(fields_anno->obj_at(index / instanceKlass::next_offset)) :
duke@435:                                  (typeArrayOop)NULL);
duke@435: 
duke@435:     // JVMSpec|   field_info {
duke@435:     // JVMSpec|         u2 access_flags;
duke@435:     // JVMSpec|         u2 name_index;
duke@435:     // JVMSpec|         u2 descriptor_index;
duke@435:     // JVMSpec|         u2 attributes_count;
duke@435:     // JVMSpec|         attribute_info attributes[attributes_count];
duke@435:     // JVMSpec|   }
duke@435: 
duke@435:     write_u2(flags & JVM_RECOGNIZED_FIELD_MODIFIERS);
duke@435:     write_u2(name_index);
duke@435:     write_u2(signature_index);
duke@435:     int attr_count = 0;
duke@435:     if (initial_value_index != 0) {
duke@435:       ++attr_count;
duke@435:     }
duke@435:     if (access_flags.is_synthetic()) {
duke@435:       // ++attr_count;
duke@435:     }
duke@435:     if (generic_signature_index != 0) {
duke@435:       ++attr_count;
duke@435:     }
duke@435:     if (anno.not_null()) {
duke@435:       ++attr_count;     // has RuntimeVisibleAnnotations attribute
duke@435:     }
duke@435: 
duke@435:     write_u2(attr_count);
duke@435: 
duke@435:     if (initial_value_index != 0) {
duke@435:       write_attribute_name_index("ConstantValue");
duke@435:       write_u4(2); //length always 2
duke@435:       write_u2(initial_value_index);
duke@435:     }
duke@435:     if (access_flags.is_synthetic()) {
duke@435:       // write_synthetic_attribute();
duke@435:     }
duke@435:     if (generic_signature_index != 0) {
duke@435:       write_signature_attribute(generic_signature_index);
duke@435:     }
duke@435:     if (anno.not_null()) {
duke@435:       write_annotations_attribute("RuntimeVisibleAnnotations", anno);
duke@435:     }
duke@435:   }
duke@435: }
duke@435: 
duke@435: // Write Code attribute
duke@435: // JVMSpec|   Code_attribute {
duke@435: // JVMSpec|     u2 attribute_name_index;
duke@435: // JVMSpec|     u4 attribute_length;
duke@435: // JVMSpec|     u2 max_stack;
duke@435: // JVMSpec|     u2 max_locals;
duke@435: // JVMSpec|     u4 code_length;
duke@435: // JVMSpec|     u1 code[code_length];
duke@435: // JVMSpec|     u2 exception_table_length;
duke@435: // JVMSpec|     {       u2 start_pc;
duke@435: // JVMSpec|             u2 end_pc;
duke@435: // JVMSpec|             u2  handler_pc;
duke@435: // JVMSpec|             u2  catch_type;
duke@435: // JVMSpec|     }       exception_table[exception_table_length];
duke@435: // JVMSpec|     u2 attributes_count;
duke@435: // JVMSpec|     attribute_info attributes[attributes_count];
duke@435: // JVMSpec|   }
duke@435: void JvmtiClassFileReconstituter::write_code_attribute(methodHandle method) {
duke@435:   constMethodHandle const_method(thread(), method->constMethod());
duke@435:   u2 line_num_cnt = 0;
duke@435:   int stackmap_len = 0;
duke@435: 
duke@435:   // compute number and length of attributes -- FIXME: for now no LVT
duke@435:   int attr_count = 0;
duke@435:   int attr_size = 0;
duke@435:   if (const_method->has_linenumber_table()) {
duke@435:     line_num_cnt = line_number_table_entries(method);
duke@435:     if (line_num_cnt != 0) {
duke@435:       ++attr_count;
duke@435:       // Compute the complete size of the line number table attribute:
duke@435:       //      LineNumberTable_attribute {
duke@435:       //        u2 attribute_name_index;
duke@435:       //        u4 attribute_length;
duke@435:       //        u2 line_number_table_length;
duke@435:       //        {  u2 start_pc;
duke@435:       //           u2 line_number;
duke@435:       //        } line_number_table[line_number_table_length];
duke@435:       //      }
duke@435:       attr_size += 2 + 4 + 2 + line_num_cnt * (2 + 2);
duke@435:     }
duke@435:   }
duke@435:   if (method->has_stackmap_table()) {
duke@435:     stackmap_len = method->stackmap_data()->length();
duke@435:     if (stackmap_len != 0) {
duke@435:       ++attr_count;
duke@435:       // Compute the  size of the stack map table attribute (VM stores raw):
duke@435:       //      StackMapTable_attribute {
duke@435:       //        u2 attribute_name_index;
duke@435:       //        u4 attribute_length;
duke@435:       //        u2 number_of_entries;
duke@435:       //        stack_map_frame_entries[number_of_entries];
duke@435:       //      }
duke@435:       attr_size += 2 + 4 + stackmap_len;
duke@435:     }
duke@435:   }
duke@435: 
duke@435:   typeArrayHandle exception_table(thread(), const_method->exception_table());
duke@435:   int exception_table_length = exception_table->length();
duke@435:   int exception_table_entries = exception_table_length / 4;
duke@435:   int code_size = const_method->code_size();
duke@435:   int size =
duke@435:     2+2+4 +                                // max_stack, max_locals, code_length
duke@435:     code_size +                            // code
duke@435:     2 +                                    // exception_table_length
duke@435:     (2+2+2+2) * exception_table_entries +  // exception_table
duke@435:     2 +                                    // attributes_count
duke@435:     attr_size;                             // attributes
duke@435: 
duke@435:   write_attribute_name_index("Code");
duke@435:   write_u4(size);
duke@435:   write_u2(method->max_stack());
duke@435:   write_u2(method->max_locals());
duke@435:   write_u4(code_size);
duke@435:   copy_bytecodes(method, (unsigned char*)writeable_address(code_size));
duke@435:   write_u2(exception_table_entries);
duke@435:   for (int index = 0; index < exception_table_length; ) {
duke@435:     write_u2(exception_table->int_at(index++));
duke@435:     write_u2(exception_table->int_at(index++));
duke@435:     write_u2(exception_table->int_at(index++));
duke@435:     write_u2(exception_table->int_at(index++));
duke@435:   }
duke@435:   write_u2(attr_count);
duke@435:   if (line_num_cnt != 0) {
duke@435:     write_line_number_table_attribute(method, line_num_cnt);
duke@435:   }
duke@435:   if (stackmap_len != 0) {
duke@435:     write_stackmap_table_attribute(method, stackmap_len);
duke@435:   }
duke@435: 
duke@435:   // FIXME: write LVT attribute
duke@435: }
duke@435: 
duke@435: // Write Exceptions attribute
duke@435: // JVMSpec|   Exceptions_attribute {
duke@435: // JVMSpec|     u2 attribute_name_index;
duke@435: // JVMSpec|     u4 attribute_length;
duke@435: // JVMSpec|     u2 number_of_exceptions;
duke@435: // JVMSpec|     u2 exception_index_table[number_of_exceptions];
duke@435: // JVMSpec|   }
duke@435: void JvmtiClassFileReconstituter::write_exceptions_attribute(constMethodHandle const_method) {
duke@435:   CheckedExceptionElement* checked_exceptions = const_method->checked_exceptions_start();
duke@435:   int checked_exceptions_length = const_method->checked_exceptions_length();
duke@435:   int size =
duke@435:     2 +                                    // number_of_exceptions
duke@435:     2 * checked_exceptions_length;         // exception_index_table
duke@435: 
duke@435:   write_attribute_name_index("Exceptions");
duke@435:   write_u4(size);
duke@435:   write_u2(checked_exceptions_length);
duke@435:   for (int index = 0; index < checked_exceptions_length; index++) {
duke@435:     write_u2(checked_exceptions[index].class_cp_index);
duke@435:   }
duke@435: }
duke@435: 
duke@435: // Write SourceFile attribute
duke@435: // JVMSpec|   SourceFile_attribute {
duke@435: // JVMSpec|     u2 attribute_name_index;
duke@435: // JVMSpec|     u4 attribute_length;
duke@435: // JVMSpec|     u2 sourcefile_index;
duke@435: // JVMSpec|   }
duke@435: void JvmtiClassFileReconstituter::write_source_file_attribute() {
duke@435:   assert(ikh()->source_file_name() != NULL, "caller must check");
duke@435: 
duke@435:   write_attribute_name_index("SourceFile");
duke@435:   write_u4(2);  // always length 2
duke@435:   write_u2(symbol_to_cpool_index(ikh()->source_file_name()));
duke@435: }
duke@435: 
duke@435: // Write SourceDebugExtension attribute
duke@435: // JSR45|   SourceDebugExtension_attribute {
duke@435: // JSR45|       u2 attribute_name_index;
duke@435: // JSR45|       u4 attribute_length;
duke@435: // JSR45|       u2 sourcefile_index;
duke@435: // JSR45|   }
duke@435: void JvmtiClassFileReconstituter::write_source_debug_extension_attribute() {
duke@435:   assert(ikh()->source_debug_extension() != NULL, "caller must check");
duke@435: 
duke@435:   write_attribute_name_index("SourceDebugExtension");
duke@435:   write_u4(2);  // always length 2
duke@435:   write_u2(symbol_to_cpool_index(ikh()->source_debug_extension()));
duke@435: }
duke@435: 
duke@435: // Write (generic) Signature attribute
duke@435: // JVMSpec|   Signature_attribute {
duke@435: // JVMSpec|     u2 attribute_name_index;
duke@435: // JVMSpec|     u4 attribute_length;
duke@435: // JVMSpec|     u2 signature_index;
duke@435: // JVMSpec|   }
duke@435: void JvmtiClassFileReconstituter::write_signature_attribute(u2 generic_signature_index) {
duke@435:   write_attribute_name_index("Signature");
duke@435:   write_u4(2);  // always length 2
duke@435:   write_u2(generic_signature_index);
duke@435: }
duke@435: 
duke@435: // Compute the number of entries in the InnerClasses attribute
duke@435: u2 JvmtiClassFileReconstituter::inner_classes_attribute_length() {
duke@435:   typeArrayOop inner_class_list = ikh()->inner_classes();
duke@435:   return (inner_class_list == NULL) ? 0 : inner_class_list->length();
duke@435: }
duke@435: 
duke@435: // Write an annotation attribute.  The VM stores them in raw form, so all we need
duke@435: // to do is add the attrubute name and fill in the length.
duke@435: // JSR202|   *Annotations_attribute {
duke@435: // JSR202|     u2 attribute_name_index;
duke@435: // JSR202|     u4 attribute_length;
duke@435: // JSR202|     ...
duke@435: // JSR202|   }
duke@435: void JvmtiClassFileReconstituter::write_annotations_attribute(const char* attr_name,
duke@435:                                                               typeArrayHandle annos) {
duke@435:   u4 length = annos->length();
duke@435:   write_attribute_name_index(attr_name);
duke@435:   write_u4(length);
duke@435:   memcpy(writeable_address(length), annos->byte_at_addr(0), length);
duke@435: }
duke@435: 
duke@435: 
duke@435: // Write InnerClasses attribute
duke@435: // JVMSpec|   InnerClasses_attribute {
duke@435: // JVMSpec|     u2 attribute_name_index;
duke@435: // JVMSpec|     u4 attribute_length;
duke@435: // JVMSpec|     u2 number_of_classes;
duke@435: // JVMSpec|     {  u2 inner_class_info_index;
duke@435: // JVMSpec|        u2 outer_class_info_index;
duke@435: // JVMSpec|        u2 inner_name_index;
duke@435: // JVMSpec|        u2 inner_class_access_flags;
duke@435: // JVMSpec|     } classes[number_of_classes];
duke@435: // JVMSpec|   }
duke@435: void JvmtiClassFileReconstituter::write_inner_classes_attribute(int length) {
duke@435:   typeArrayOop inner_class_list = ikh()->inner_classes();
duke@435:   guarantee(inner_class_list != NULL && inner_class_list->length() == length,
duke@435:             "caller must check");
duke@435:   typeArrayHandle inner_class_list_h(thread(), inner_class_list);
duke@435:   assert (length % instanceKlass::inner_class_next_offset == 0, "just checking");
duke@435:   u2 entry_count = length / instanceKlass::inner_class_next_offset;
duke@435:   u4 size = 2 + entry_count * (2+2+2+2);
duke@435: 
duke@435:   write_attribute_name_index("InnerClasses");
duke@435:   write_u4(size);
duke@435:   write_u2(entry_count);
duke@435:   for (int i = 0; i < length; i += instanceKlass::inner_class_next_offset) {
duke@435:     write_u2(inner_class_list_h->ushort_at(
duke@435:                       i + instanceKlass::inner_class_inner_class_info_offset));
duke@435:     write_u2(inner_class_list_h->ushort_at(
duke@435:                       i + instanceKlass::inner_class_outer_class_info_offset));
duke@435:     write_u2(inner_class_list_h->ushort_at(
duke@435:                       i + instanceKlass::inner_class_inner_name_offset));
duke@435:     write_u2(inner_class_list_h->ushort_at(
duke@435:                       i + instanceKlass::inner_class_access_flags_offset));
duke@435:   }
duke@435: }
duke@435: 
duke@435: // Write Synthetic attribute
duke@435: // JVMSpec|   Synthetic_attribute {
duke@435: // JVMSpec|     u2 attribute_name_index;
duke@435: // JVMSpec|     u4 attribute_length;
duke@435: // JVMSpec|   }
duke@435: void JvmtiClassFileReconstituter::write_synthetic_attribute() {
duke@435:   write_attribute_name_index("Synthetic");
duke@435:   write_u4(0); //length always zero
duke@435: }
duke@435: 
duke@435: // Compute size of LineNumberTable
duke@435: u2 JvmtiClassFileReconstituter::line_number_table_entries(methodHandle method) {
duke@435:   // The line number table is compressed so we don't know how big it is until decompressed.
duke@435:   // Decompression is really fast so we just do it twice.
duke@435:   u2 num_entries = 0;
duke@435:   CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
duke@435:   while (stream.read_pair()) {
duke@435:     num_entries++;
duke@435:   }
duke@435:   return num_entries;
duke@435: }
duke@435: 
duke@435: // Write LineNumberTable attribute
duke@435: // JVMSpec|   LineNumberTable_attribute {
duke@435: // JVMSpec|     u2 attribute_name_index;
duke@435: // JVMSpec|     u4 attribute_length;
duke@435: // JVMSpec|     u2 line_number_table_length;
duke@435: // JVMSpec|     {  u2 start_pc;
duke@435: // JVMSpec|        u2 line_number;
duke@435: // JVMSpec|     } line_number_table[line_number_table_length];
duke@435: // JVMSpec|   }
duke@435: void JvmtiClassFileReconstituter::write_line_number_table_attribute(methodHandle method,
duke@435:                                                                     u2 num_entries) {
duke@435: 
duke@435:   write_attribute_name_index("LineNumberTable");
duke@435:   write_u4(2 + num_entries * (2 + 2));
duke@435:   write_u2(num_entries);
duke@435: 
duke@435:   CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
duke@435:   while (stream.read_pair()) {
duke@435:     write_u2(stream.bci());
duke@435:     write_u2(stream.line());
duke@435:   }
duke@435: }
duke@435: 
duke@435: // Write stack map table attribute
duke@435: // JSR-202|   StackMapTable_attribute {
duke@435: // JSR-202|     u2 attribute_name_index;
duke@435: // JSR-202|     u4 attribute_length;
duke@435: // JSR-202|     u2 number_of_entries;
duke@435: // JSR-202|     stack_map_frame_entries[number_of_entries];
duke@435: // JSR-202|   }
duke@435: void JvmtiClassFileReconstituter::write_stackmap_table_attribute(methodHandle method,
duke@435:                                                                  int stackmap_len) {
duke@435: 
duke@435:   write_attribute_name_index("StackMapTable");
duke@435:   write_u4(stackmap_len);
duke@435:   memcpy(
duke@435:     writeable_address(stackmap_len),
duke@435:     (void*)(method->stackmap_data()->byte_at_addr(0)),
duke@435:     stackmap_len);
duke@435: }
duke@435: 
duke@435: // Write one method_info structure
duke@435: // JVMSpec|   method_info {
duke@435: // JVMSpec|     u2 access_flags;
duke@435: // JVMSpec|     u2 name_index;
duke@435: // JVMSpec|     u2 descriptor_index;
duke@435: // JVMSpec|     u2 attributes_count;
duke@435: // JVMSpec|     attribute_info attributes[attributes_count];
duke@435: // JVMSpec|   }
duke@435: void JvmtiClassFileReconstituter::write_method_info(methodHandle method) {
duke@435:   AccessFlags access_flags = method->access_flags();
duke@435:   constMethodHandle const_method(thread(), method->constMethod());
duke@435:   u2 generic_signature_index = const_method->generic_signature_index();
duke@435:   typeArrayHandle anno(thread(), method->annotations());
duke@435:   typeArrayHandle param_anno(thread(), method->parameter_annotations());
duke@435:   typeArrayHandle default_anno(thread(), method->annotation_default());
duke@435: 
duke@435:   write_u2(access_flags.get_flags() & JVM_RECOGNIZED_METHOD_MODIFIERS);
duke@435:   write_u2(const_method->name_index());
duke@435:   write_u2(const_method->signature_index());
duke@435: 
duke@435:   // write attributes in the same order javac does, so we can test with byte for
duke@435:   // byte comparison
duke@435:   int attr_count = 0;
duke@435:   if (const_method->code_size() != 0) {
duke@435:     ++attr_count;     // has Code attribute
duke@435:   }
duke@435:   if (const_method->has_checked_exceptions()) {
duke@435:     ++attr_count;     // has Exceptions attribute
duke@435:   }
duke@435:   if (default_anno.not_null()) {
duke@435:     ++attr_count;     // has AnnotationDefault attribute
duke@435:   }
duke@435:   // Deprecated attribute would go here
duke@435:   if (access_flags.is_synthetic()) { // FIXME
duke@435:     // ++attr_count;
duke@435:   }
duke@435:   if (generic_signature_index != 0) {
duke@435:     ++attr_count;
duke@435:   }
duke@435:   if (anno.not_null()) {
duke@435:     ++attr_count;     // has RuntimeVisibleAnnotations attribute
duke@435:   }
duke@435:   if (param_anno.not_null()) {
duke@435:     ++attr_count;     // has RuntimeVisibleParameterAnnotations attribute
duke@435:   }
duke@435: 
duke@435:   write_u2(attr_count);
duke@435:   if (const_method->code_size() > 0) {
duke@435:     write_code_attribute(method);
duke@435:   }
duke@435:   if (const_method->has_checked_exceptions()) {
duke@435:     write_exceptions_attribute(const_method);
duke@435:   }
duke@435:   if (default_anno.not_null()) {
duke@435:     write_annotations_attribute("AnnotationDefault", default_anno);
duke@435:   }
duke@435:   // Deprecated attribute would go here
duke@435:   if (access_flags.is_synthetic()) {
duke@435:     // write_synthetic_attribute();
duke@435:   }
duke@435:   if (generic_signature_index != 0) {
duke@435:     write_signature_attribute(generic_signature_index);
duke@435:   }
duke@435:   if (anno.not_null()) {
duke@435:     write_annotations_attribute("RuntimeVisibleAnnotations", anno);
duke@435:   }
duke@435:   if (param_anno.not_null()) {
duke@435:     write_annotations_attribute("RuntimeVisibleParameterAnnotations", param_anno);
duke@435:   }
duke@435: }
duke@435: 
duke@435: // Write the class attributes portion of ClassFile structure
duke@435: // JVMSpec|     u2 attributes_count;
duke@435: // JVMSpec|     attribute_info attributes[attributes_count];
duke@435: void JvmtiClassFileReconstituter::write_class_attributes() {
duke@435:   u2 inner_classes_length = inner_classes_attribute_length();
duke@435:   symbolHandle generic_signature(thread(), ikh()->generic_signature());
duke@435:   typeArrayHandle anno(thread(), ikh()->class_annotations());
duke@435: 
duke@435:   int attr_count = 0;
duke@435:   if (generic_signature() != NULL) {
duke@435:     ++attr_count;
duke@435:   }
duke@435:   if (ikh()->source_file_name() != NULL) {
duke@435:     ++attr_count;
duke@435:   }
duke@435:   if (ikh()->source_debug_extension() != NULL) {
duke@435:     ++attr_count;
duke@435:   }
duke@435:   if (inner_classes_length > 0) {
duke@435:     ++attr_count;
duke@435:   }
duke@435:   if (anno.not_null()) {
duke@435:     ++attr_count;     // has RuntimeVisibleAnnotations attribute
duke@435:   }
duke@435: 
duke@435:   write_u2(attr_count);
duke@435: 
duke@435:   if (generic_signature() != NULL) {
duke@435:     write_signature_attribute(symbol_to_cpool_index(generic_signature()));
duke@435:   }
duke@435:   if (ikh()->source_file_name() != NULL) {
duke@435:     write_source_file_attribute();
duke@435:   }
duke@435:   if (ikh()->source_debug_extension() != NULL) {
duke@435:     write_source_debug_extension_attribute();
duke@435:   }
duke@435:   if (inner_classes_length > 0) {
duke@435:     write_inner_classes_attribute(inner_classes_length);
duke@435:   }
duke@435:   if (anno.not_null()) {
duke@435:     write_annotations_attribute("RuntimeVisibleAnnotations", anno);
duke@435:   }
duke@435: }
duke@435: 
duke@435: // Write the method information portion of ClassFile structure
duke@435: // JVMSpec|     u2 methods_count;
duke@435: // JVMSpec|     method_info methods[methods_count];
duke@435: void JvmtiClassFileReconstituter::write_method_infos() {
duke@435:   HandleMark hm(thread());
duke@435:   objArrayHandle methods(thread(), ikh()->methods());
duke@435:   int num_methods = methods->length();
duke@435: 
duke@435:   write_u2(num_methods);
duke@435:   if (JvmtiExport::can_maintain_original_method_order()) {
duke@435:     int index;
duke@435:     int original_index;
duke@435:     int* method_order = NEW_RESOURCE_ARRAY(int, num_methods);
duke@435: 
duke@435:     // invert the method order mapping
duke@435:     for (index = 0; index < num_methods; index++) {
duke@435:       original_index = ikh()->method_ordering()->int_at(index);
duke@435:       assert(original_index >= 0 && original_index < num_methods,
duke@435:              "invalid original method index");
duke@435:       method_order[original_index] = index;
duke@435:     }
duke@435: 
duke@435:     // write in original order
duke@435:     for (original_index = 0; original_index < num_methods; original_index++) {
duke@435:       index = method_order[original_index];
duke@435:       methodHandle method(thread(), (methodOop)(ikh()->methods()->obj_at(index)));
duke@435:       write_method_info(method);
duke@435:     }
duke@435:   } else {
duke@435:     // method order not preserved just dump the method infos
duke@435:     for (int index = 0; index < num_methods; index++) {
duke@435:       methodHandle method(thread(), (methodOop)(ikh()->methods()->obj_at(index)));
duke@435:       write_method_info(method);
duke@435:     }
duke@435:   }
duke@435: }
duke@435: 
duke@435: void JvmtiClassFileReconstituter::write_class_file_format() {
duke@435:   ReallocMark();
duke@435: 
duke@435:   // JVMSpec|   ClassFile {
duke@435:   // JVMSpec|           u4 magic;
duke@435:   write_u4(0xCAFEBABE);
duke@435: 
duke@435:   // JVMSpec|           u2 minor_version;
duke@435:   // JVMSpec|           u2 major_version;
duke@435:   write_u2(ikh()->minor_version());
duke@435:   u2 major = ikh()->major_version();
duke@435:   write_u2(major);
duke@435: 
duke@435:   // JVMSpec|           u2 constant_pool_count;
duke@435:   // JVMSpec|           cp_info constant_pool[constant_pool_count-1];
duke@435:   write_u2(cpool()->length());
duke@435:   copy_cpool_bytes(writeable_address(cpool_size()));
duke@435: 
duke@435:   // JVMSpec|           u2 access_flags;
duke@435:   write_u2(ikh()->access_flags().get_flags() & JVM_RECOGNIZED_CLASS_MODIFIERS);
duke@435: 
duke@435:   // JVMSpec|           u2 this_class;
duke@435:   // JVMSpec|           u2 super_class;
duke@435:   write_u2(class_symbol_to_cpool_index(ikh()->name()));
duke@435:   klassOop super_class = ikh()->super();
duke@435:   write_u2(super_class == NULL? 0 :  // zero for java.lang.Object
duke@435:                 class_symbol_to_cpool_index(super_class->klass_part()->name()));
duke@435: 
duke@435:   // JVMSpec|           u2 interfaces_count;
duke@435:   // JVMSpec|           u2 interfaces[interfaces_count];
duke@435:   objArrayHandle interfaces(thread(), ikh()->local_interfaces());
duke@435:   int num_interfaces = interfaces->length();
duke@435:   write_u2(num_interfaces);
duke@435:   for (int index = 0; index < num_interfaces; index++) {
duke@435:     HandleMark hm(thread());
duke@435:     instanceKlassHandle iikh(thread(), klassOop(interfaces->obj_at(index)));
duke@435:     write_u2(class_symbol_to_cpool_index(iikh->name()));
duke@435:   }
duke@435: 
duke@435:   // JVMSpec|           u2 fields_count;
duke@435:   // JVMSpec|           field_info fields[fields_count];
duke@435:   write_field_infos();
duke@435: 
duke@435:   // JVMSpec|           u2 methods_count;
duke@435:   // JVMSpec|           method_info methods[methods_count];
duke@435:   write_method_infos();
duke@435: 
duke@435:   // JVMSpec|           u2 attributes_count;
duke@435:   // JVMSpec|           attribute_info attributes[attributes_count];
duke@435:   // JVMSpec|   } /* end ClassFile 8?
duke@435:   write_class_attributes();
duke@435: }
duke@435: 
duke@435: address JvmtiClassFileReconstituter::writeable_address(size_t size) {
duke@435:   size_t used_size = _buffer_ptr - _buffer;
duke@435:   if (size + used_size >= _buffer_size) {
duke@435:     // compute the new buffer size: must be at least twice as big as before
duke@435:     // plus whatever new is being used; then convert to nice clean block boundary
duke@435:     size_t new_buffer_size = (size + _buffer_size*2 + 1) / initial_buffer_size
duke@435:                                                          * initial_buffer_size;
duke@435: 
duke@435:     // VM goes belly-up if the memory isn't available, so cannot do OOM processing
duke@435:     _buffer = REALLOC_RESOURCE_ARRAY(u1, _buffer, _buffer_size, new_buffer_size);
duke@435:     _buffer_size = new_buffer_size;
duke@435:     _buffer_ptr = _buffer + used_size;
duke@435:   }
duke@435:   u1* ret_ptr = _buffer_ptr;
duke@435:   _buffer_ptr += size;
duke@435:   return ret_ptr;
duke@435: }
duke@435: 
duke@435: void JvmtiClassFileReconstituter::write_attribute_name_index(const char* name) {
duke@435:   unsigned int hash_ignored;
duke@435:   symbolOop sym = SymbolTable::lookup_only(name, (int)strlen(name), hash_ignored);
duke@435:   assert(sym != NULL, "attribute name symbol not found");
duke@435:   u2 attr_name_index = symbol_to_cpool_index(sym);
duke@435:   assert(attr_name_index != 0, "attribute name symbol not in constant pool");
duke@435:   write_u2(attr_name_index);
duke@435: }
duke@435: 
duke@435: void JvmtiClassFileReconstituter::write_u1(u1 x) {
duke@435:   *writeable_address(1) = x;
duke@435: }
duke@435: 
duke@435: void JvmtiClassFileReconstituter::write_u2(u2 x) {
duke@435:   Bytes::put_Java_u2(writeable_address(2), x);
duke@435: }
duke@435: 
duke@435: void JvmtiClassFileReconstituter::write_u4(u4 x) {
duke@435:   Bytes::put_Java_u4(writeable_address(4), x);
duke@435: }
duke@435: 
duke@435: void JvmtiClassFileReconstituter::write_u8(u8 x) {
duke@435:   Bytes::put_Java_u8(writeable_address(8), x);
duke@435: }
duke@435: 
duke@435: void JvmtiClassFileReconstituter::copy_bytecodes(methodHandle mh,
duke@435:                                                  unsigned char* bytecodes) {
duke@435:   // use a BytecodeStream to iterate over the bytecodes. JVM/fast bytecodes
duke@435:   // and the breakpoint bytecode are converted to their original bytecodes.
duke@435: 
duke@435:   BytecodeStream bs(mh);
duke@435: 
duke@435:   unsigned char* p = bytecodes;
duke@435:   Bytecodes::Code code;
duke@435:   bool is_rewritten = instanceKlass::cast(mh->method_holder())->is_rewritten();
duke@435: 
duke@435:   while ((code = bs.next()) >= 0) {
duke@435:     assert(Bytecodes::is_java_code(code), "sanity check");
duke@435:     assert(code != Bytecodes::_breakpoint, "sanity check");
duke@435: 
duke@435:     // length of bytecode (mnemonic + operands)
duke@435:     address bcp = bs.bcp();
duke@435:     int len = bs.next_bcp() - bcp;
duke@435:     assert(len > 0, "length must be > 0");
duke@435: 
duke@435:     // copy the bytecodes
duke@435:     *p = (unsigned char) (bs.is_wide()? Bytecodes::_wide : code);
duke@435:     if (len > 1) {
duke@435:       memcpy(p+1, bcp+1, len-1);
duke@435:     }
duke@435: 
duke@435:     // During linking the get/put and invoke instructions are rewritten
duke@435:     // with an index into the constant pool cache. The original constant
duke@435:     // pool index must be returned to caller.  Rewrite the index.
duke@435:     if (is_rewritten && len >= 3) {
duke@435:       switch (code) {
duke@435:       case Bytecodes::_getstatic       :  // fall through
duke@435:       case Bytecodes::_putstatic       :  // fall through
duke@435:       case Bytecodes::_getfield        :  // fall through
duke@435:       case Bytecodes::_putfield        :  // fall through
duke@435:       case Bytecodes::_invokevirtual   :  // fall through
duke@435:       case Bytecodes::_invokespecial   :  // fall through
duke@435:       case Bytecodes::_invokestatic    :  // fall through
duke@435:       case Bytecodes::_invokeinterface :
duke@435:         assert(len == 3 || (code == Bytecodes::_invokeinterface && len ==5),
duke@435:                "sanity check");
duke@435:         // cache cannot be pre-fetched since some classes won't have it yet
duke@435:         ConstantPoolCacheEntry* entry =
duke@435:           mh->constants()->cache()->entry_at(Bytes::get_native_u2(bcp+1));
duke@435:         int i = entry->constant_pool_index();
duke@435:         assert(i < mh->constants()->length(), "sanity check");
duke@435:         Bytes::put_Java_u2((address)(p+1), (u2)i);     // java byte ordering
duke@435:         break;
duke@435:       }
duke@435:     }
duke@435: 
duke@435:     p += len;
duke@435:   }
duke@435: }