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8012715: G1: GraphKit accesses PtrQueue::_index as int but is size_t Summary: In graphKit INT operations were generated to access PtrQueue::_index which has type size_t. This is 64 bit on 64-bit machines. No problems occur on little endian machines as long as the index fits into 32 bit, but on big endian machines the upper part is read, which is zero. This leads to unnecessary branches to the slow path in the runtime. Reviewed-by: twisti, johnc Contributed-by: Martin Doerr <martin.doerr@sap.com>
author johnc
date Wed, 24 Apr 2013 14:48:43 -0700
parents f95d63e2154a
children
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/*
 * Copyright (c) 1998, 2010, 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.
 *
 */

#ifndef CPU_X86_VM_INTERPRETERRT_X86_HPP
#define CPU_X86_VM_INTERPRETERRT_X86_HPP

#include "memory/allocation.hpp"

// native method calls

class SignatureHandlerGenerator: public NativeSignatureIterator {
 private:
  MacroAssembler* _masm;
#ifdef AMD64
#ifdef _WIN64
  unsigned int _num_args;
#else
  unsigned int _num_fp_args;
  unsigned int _num_int_args;
#endif // _WIN64
  int _stack_offset;
#else
  void move(int from_offset, int to_offset);
  void box(int from_offset, int to_offset);
#endif // AMD64

  void pass_int();
  void pass_long();
  void pass_float();
#ifdef AMD64
  void pass_double();
#endif // AMD64
  void pass_object();

 public:
  // Creation
  SignatureHandlerGenerator(methodHandle method, CodeBuffer* buffer) : NativeSignatureIterator(method) {
    _masm = new MacroAssembler(buffer);
#ifdef AMD64
#ifdef _WIN64
    _num_args = (method->is_static() ? 1 : 0);
    _stack_offset = (Argument::n_int_register_parameters_c+1)* wordSize; // don't overwrite return address
#else
    _num_int_args = (method->is_static() ? 1 : 0);
    _num_fp_args = 0;
    _stack_offset = wordSize; // don't overwrite return address
#endif // _WIN64
#endif // AMD64
  }

  // Code generation
  void generate(uint64_t fingerprint);

  // Code generation support
  static Register from();
  static Register to();
  static Register temp();
};

#endif // CPU_X86_VM_INTERPRETERRT_X86_HPP