disassembler/X86Disassembler.cpp

   1 /*
   2  * Copyright (C) 2013, 2014 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "Disassembler.h"
  28
  29 #if ENABLE(DISASSEMBLER)
  30 #if USE(UDIS86) || (USE(LLVM_DISASSEMBLER) && (CPU(X86_64) || CPU(X86)))
  31
  32 #include "MacroAssemblerCodeRef.h"
  33 #include "Options.h"
  34 #include "UDis86Disassembler.h"
  35 #include "LLVMDisassembler.h"
  36
  37 namespace JSC {
  38
  39 // This horrifying monster is needed because neither of our disassemblers supports
  40 // all of x86, and using them together to disassemble the same instruction stream
  41 // would result in a fairly jarring print-out since they print in different
  42 // styles. Maybe we can do better in the future, but for now the caller hints
  43 // whether he's using the subset of the architecture that our MacroAssembler
  44 // supports (in which case we go with UDis86) or if he's using the LLVM subset.
  45
  46 bool tryToDisassemble(const MacroAssemblerCodePtr& codePtr, size_t size, const char* prefix, PrintStream& out, InstructionSubsetHint subsetHint)
  47 {
  48     if (Options::forceUDis86Disassembler())
  49         return tryToDisassembleWithUDis86(codePtr, size, prefix, out, subsetHint);
  50
  51     if (Options::forceLLVMDisassembler())
  52         return tryToDisassembleWithLLVM(codePtr, size, prefix, out, subsetHint);
  53
  54     if (subsetHint == MacroAssemblerSubset
  55         && tryToDisassembleWithUDis86(codePtr, size, prefix, out, MacroAssemblerSubset))
  56         return true;
  57
  58     if (subsetHint == LLVMSubset
  59         && tryToDisassembleWithLLVM(codePtr, size, prefix, out, LLVMSubset))
  60         return true;
  61
  62     if (tryToDisassembleWithUDis86(codePtr, size, prefix, out, subsetHint))
  63         return true;
  64     if (tryToDisassembleWithLLVM(codePtr, size, prefix, out, subsetHint))
  65         return true;
  66
  67     RELEASE_ASSERT_NOT_REACHED();
  68     return false;
  69 }
  70
  71 } // namespace JSC
  72
  73 #endif // USE(UDIS86) || USE(LLVM_DISASSEMBLER)
  74 #endif // ENABLE(DISASSEMBLER)