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Java example source code file (generateJvmOffsets.cpp)

This example Java source code file (generateJvmOffsets.cpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

assert, compiler1, compiler2, gen_index, gen_offs, gen_offset, gen_size, gen_table, gen_value, lir_opr, name, null, string, type

The generateJvmOffsets.cpp Java example source code

/*
 * Copyright (c) 2003, 2013, 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.
 *
 */

/*
 * This is to provide sanity check in jhelper.d which compares SCCS
 * versions of generateJvmOffsets.cpp used to create and extract
 * contents of __JvmOffsets[] table.
 * The __JvmOffsets[] table is located in generated JvmOffsets.cpp.
 *
 * GENOFFS_SCCS_VER 34
 */

#include "generateJvmOffsets.h"

/* A workaround for private and protected fields */
#define private   public
#define protected public

#include <proc_service.h>
#include "code/codeBlob.hpp"
#include "code/nmethod.hpp"
#include "code/pcDesc.hpp"
#include "gc_interface/collectedHeap.hpp"
#include "memory/heap.hpp"
#include "memory/memRegion.hpp"
#include "memory/universe.hpp"
#include "oops/constMethod.hpp"
#include "oops/klass.hpp"
#include "oops/method.hpp"
#include "oops/oop.hpp"
#include "oops/symbol.hpp"
#include "runtime/virtualspace.hpp"
#include "runtime/vmStructs.hpp"
#include "utilities/accessFlags.hpp"
#include "utilities/globalDefinitions.hpp"
#ifdef COMPILER1
#ifdef ASSERT

/*
 * To avoid the most part of potential link errors
 * we link this program with -z nodefs .
 *
 * But for 'debug1' and 'fastdebug1' we still have to provide
 * a particular workaround for the following symbols below.
 * It will be good to find out a generic way in the future.
 */

#pragma weak tty
#pragma weak CMSExpAvgFactor

#if defined(i386) || defined(__i386) || defined(__amd64)
#pragma weak noreg
#endif /* i386 */

LIR_Opr LIR_OprFact::illegalOpr = (LIR_Opr) 0;

address StubRoutines::_call_stub_return_address = NULL;

StubQueue* AbstractInterpreter::_code = NULL;

#endif /* ASSERT */
#endif /* COMPILER1 */

#define GEN_OFFS(Type,Name)                             \
  switch(gen_variant) {                                 \
  case GEN_OFFSET:                                      \
    printf("#define OFFSET_%-33s %d\n",                 \
            #Type #Name, offset_of(Type, Name));        \
    break;                                              \
  case GEN_INDEX:                                       \
    printf("#define IDX_OFFSET_%-33s %d\n",             \
            #Type #Name, index++);                      \
    break;                                              \
  case GEN_TABLE:                                       \
    printf("\tOFFSET_%s,\n", #Type #Name);              \
    break;                                              \
  }

#define GEN_SIZE(Type)                                  \
  switch(gen_variant) {                                 \
  case GEN_OFFSET:                                      \
    printf("#define SIZE_%-35s %d\n",                   \
            #Type, sizeof(Type));                       \
    break;                                              \
  case GEN_INDEX:                                       \
    printf("#define IDX_SIZE_%-35s %d\n",               \
            #Type, index++);                            \
    break;                                              \
  case GEN_TABLE:                                       \
    printf("\tSIZE_%s,\n", #Type);                      \
    break;                                              \
  }

#define GEN_VALUE(String,Value)                         \
  switch(gen_variant) {                                 \
  case GEN_OFFSET:                                      \
    printf("#define %-40s %d\n", #String, Value);       \
    break;                                              \
  case GEN_INDEX:                                       \
    printf("#define IDX_%-40s %d\n", #String, index++); \
    break;                                              \
  case GEN_TABLE:                                       \
    printf("\t" #String ",\n");                         \
    break;                                              \
  }

void gen_prologue(GEN_variant gen_variant) {
    const char *suffix;

    switch(gen_variant) {
      case GEN_OFFSET: suffix = ".h";        break;
      case GEN_INDEX:  suffix = "Index.h";   break;
      case GEN_TABLE:  suffix = ".cpp";      break;
    }

    printf("/*\n");
    printf(" * JvmOffsets%s !!!DO NOT EDIT!!! \n", suffix);
    printf(" * The generateJvmOffsets program generates this file!\n");
    printf(" */\n\n");
    switch(gen_variant) {

      case GEN_OFFSET:
      case GEN_INDEX:
        break;

      case GEN_TABLE:
        printf("#include \"JvmOffsets.h\"\n");
        printf("\n");
        printf("int __JvmOffsets[] = {\n");
        break;
    }
}

void gen_epilogue(GEN_variant gen_variant) {
    if (gen_variant != GEN_TABLE) {
        return;
    }
    printf("};\n\n");
    return;
}

int generateJvmOffsets(GEN_variant gen_variant) {
  int index = 0;        /* It is used to generate JvmOffsetsIndex.h */
  int pointer_size = sizeof(void *);
  int data_model = (pointer_size == 4) ? PR_MODEL_ILP32 : PR_MODEL_LP64;

  gen_prologue(gen_variant);

  GEN_VALUE(DATA_MODEL, data_model);
  GEN_VALUE(POINTER_SIZE, pointer_size);
#if defined(TIERED)
  GEN_VALUE(COMPILER, 3);
#elif COMPILER1
  GEN_VALUE(COMPILER, 1);
#elif COMPILER2
  GEN_VALUE(COMPILER, 2);
#else
  GEN_VALUE(COMPILER, 0);
#endif // COMPILER1 && COMPILER2
  printf("\n");

  GEN_OFFS(CollectedHeap, _reserved);
  GEN_OFFS(MemRegion, _start);
  GEN_OFFS(MemRegion, _word_size);
  GEN_SIZE(HeapWord);
  printf("\n");

  GEN_OFFS(VMStructEntry, typeName);
  GEN_OFFS(VMStructEntry, fieldName);
  GEN_OFFS(VMStructEntry, address);
  GEN_SIZE(VMStructEntry);
  printf("\n");

  GEN_VALUE(MAX_METHOD_CODE_SIZE, max_method_code_size);
#if defined(sparc) || defined(__sparc)
  GEN_VALUE(OFFSET_interpreter_frame_method, 2 * pointer_size);     /* L2 in saved window */
  GEN_VALUE(OFFSET_interpreter_frame_sender_sp, 13 * pointer_size); /* I5 in saved window */
  // Fake value for consistency. It is not going to be used.
  GEN_VALUE(OFFSET_interpreter_frame_bcx_offset, 0xFFFF);
#elif defined(i386) || defined(__i386) || defined(__amd64)
  GEN_VALUE(OFFSET_interpreter_frame_sender_sp, -1 * pointer_size);
  GEN_VALUE(OFFSET_interpreter_frame_method, -3 * pointer_size);
  GEN_VALUE(OFFSET_interpreter_frame_bcx_offset, -7 * pointer_size);
#endif

  GEN_OFFS(Klass, _name);
  GEN_OFFS(ConstantPool, _pool_holder);
  printf("\n");

  GEN_VALUE(OFFSET_HeapBlockHeader_used, offset_of(HeapBlock::Header, _used));
  GEN_OFFS(oopDesc, _metadata);
  printf("\n");

  GEN_VALUE(AccessFlags_NATIVE, JVM_ACC_NATIVE);
  GEN_VALUE(ConstMethod_has_linenumber_table, ConstMethod::_has_linenumber_table);
  GEN_OFFS(AccessFlags, _flags);
  GEN_OFFS(Symbol, _length);
  GEN_OFFS(Symbol, _body);
  printf("\n");

  GEN_OFFS(Method, _constMethod);
  GEN_OFFS(Method, _access_flags);
  printf("\n");

  GEN_OFFS(ConstMethod, _constants);
  GEN_OFFS(ConstMethod, _flags);
  GEN_OFFS(ConstMethod, _code_size);
  GEN_OFFS(ConstMethod, _name_index);
  GEN_OFFS(ConstMethod, _signature_index);
  printf("\n");

  GEN_OFFS(CodeHeap, _memory);
  GEN_OFFS(CodeHeap, _segmap);
  GEN_OFFS(CodeHeap, _log2_segment_size);
  printf("\n");

  GEN_OFFS(VirtualSpace, _low_boundary);
  GEN_OFFS(VirtualSpace, _high_boundary);
  GEN_OFFS(VirtualSpace, _low);
  GEN_OFFS(VirtualSpace, _high);
  printf("\n");

  GEN_OFFS(CodeBlob, _name);
  GEN_OFFS(CodeBlob, _header_size);
  GEN_OFFS(CodeBlob, _content_offset);
  GEN_OFFS(CodeBlob, _code_offset);
  GEN_OFFS(CodeBlob, _data_offset);
  GEN_OFFS(CodeBlob, _frame_size);
  printf("\n");

  GEN_OFFS(nmethod, _method);
  GEN_OFFS(nmethod, _metadata_offset);
  GEN_OFFS(nmethod, _scopes_data_offset);
  GEN_OFFS(nmethod, _scopes_pcs_offset);
  GEN_OFFS(nmethod, _handler_table_offset);
  GEN_OFFS(nmethod, _deoptimize_offset);
  GEN_OFFS(nmethod, _orig_pc_offset);

  GEN_OFFS(PcDesc, _pc_offset);
  GEN_OFFS(PcDesc, _scope_decode_offset);

  printf("\n");

  GEN_OFFS(NarrowPtrStruct, _base);
  GEN_OFFS(NarrowPtrStruct, _shift);
  printf("\n");

  GEN_VALUE(SIZE_HeapBlockHeader, sizeof(HeapBlock::Header));
  GEN_SIZE(oopDesc);
  GEN_SIZE(ConstantPool);
  printf("\n");

  GEN_SIZE(PcDesc);
  GEN_SIZE(Method);
  GEN_SIZE(ConstMethod);
  GEN_SIZE(nmethod);
  GEN_SIZE(CodeBlob);
  GEN_SIZE(BufferBlob);
  GEN_SIZE(SingletonBlob);
  GEN_SIZE(RuntimeStub);
  GEN_SIZE(SafepointBlob);

  gen_epilogue(gen_variant);
  printf("\n");

  fflush(stdout);
  return 0;
}

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