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
37namespace 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
46bool 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)
75