jdk8-mips64-public/hotspot: src/share/vm/prims/jvmtiClassFileReconstituter.cpp@8150fa46d2ed (annotated)

src/share/vm/prims/jvmtiClassFileReconstituter.cpp@8150fa46d2ed (annotated)

src/share/vm/prims/jvmtiClassFileReconstituter.cpp

Tue, 26 Jun 2012 19:08:44 -0400

author: jiangli
date: Tue, 26 Jun 2012 19:08:44 -0400
changeset 3917: 8150fa46d2ed
parent 3670: f7c4174b33ba
child 3921: e74da3c2b827
permissions: -rw-r--r--

7178145: Change constMethodOop::_exception_table to optionally inlined u2 table.
Summary: Change constMethodOop::_exception_table to optionally inlined u2 table.
Reviewed-by: bdelsart, coleenp, kamg

 /*
  * 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, 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());
   objArrayHandle fields_anno(thread(), 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();
     typeArrayHandle anno(thread(), fields_anno.not_null() ?
                                  (typeArrayOop)(fields_anno->obj_at(fs.index())) :
                                  (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(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.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;
   int local_variable_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();
     ++attr_count;
     if (local_variable_table_length != 0) {
       // 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);
     }
   }
   ExceptionTable exception_table(method());
   int exception_table_length = exception_table.length();
   int code_size = const_method->code_size();
   int size =
 +2+4 +                                // max_stack, max_locals, code_length
     code_size +                            // code
 +                                    // exception_table_length
     (2+2+2+2) * exception_table_length +   // exception_table
 +                                    // 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_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);
   }
 }
 // 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 =
 +                                    // number_of_exceptions
 * 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() {
   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,
                                                               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) {
   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 LineNumberTable 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 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();
   Symbol* generic_signature = 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) {
   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 = 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.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 >= 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) ||
                (code == Bytecodes::_invokedynamic   && 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;
   }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/prims/jvmtiClassFileReconstituter.cpp@8150fa46d2ed (annotated)

src/share/vm/prims/jvmtiClassFileReconstituter.cpp