view src/os/bsd/vm/decoder_machO.hpp @ 15388:769fc3629f59

Add phase FlowSensitiveReductionPhase. It is possible to remove GuardingPiNodes, CheckCastNodes, and FixedGuards during HighTier under certain conditions (control-flow sensitive conditions). The phase added in this commit (FlowSensitiveReductionPhase) does that, and in addition replaces usages with "downcasting" PiNodes when possible thus resulting in more precise object stamps (e.g., non-null). Finally, usages of floating, side-effects free, expressions are also simplified (as per control-flow sensitive conditions). The newly added phase runs only during HighTier and can be deactivated using Graal option FlowSensitiveReduction (it is active by default).
author Miguel Garcia <miguel.m.garcia@oracle.com>
date Fri, 25 Apr 2014 16:50:52 +0200
parents 3b01d0321dfa
children
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/*
 * Copyright (c) 2011, 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.
 *
 */

#ifndef OS_BSD_VM_DECODER_MACHO_HPP
#define OS_BSD_VM_DECODER_MACHO_HPP

#ifdef __APPLE__

#include "utilities/decoder.hpp"

// Just a placehold for now, a real implementation should derive
// from AbstractDecoder
class MachODecoder : public AbstractDecoder {
 public:
  MachODecoder() { }
  ~MachODecoder() { }
  virtual bool can_decode_C_frame_in_vm() const {
    return true;
  }
  virtual bool demangle(const char* symbol, char* buf, int buflen);
  virtual bool decode(address pc, char* buf, int buflen, int* offset,
                      const void* base);
  virtual bool decode(address pc, char* buf, int buflen, int* offset,
                      const char* module_path = NULL) {
    ShouldNotReachHere();
    return false;
  }

 private:
  void * mach_find_command(struct mach_header_64 * mach_base, uint32_t command_wanted);
  char * mach_find_in_stringtable(char *strtab, uint32_t tablesize, int strx_wanted);
};

#endif

#endif // OS_BSD_VM_DECODER_MACHO_HPP