JavaScriptCore-7600.1.4.9.tar.gz

[apple/javascriptcore.git] / disassembler / X86Disassembler.cpp

diff --git a/disassembler/X86Disassembler.cpp b/disassembler/X86Disassembler.cpp
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+/*
+ * Copyright (C) 2013, 2014 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+#include "Disassembler.h"
+
+#if ENABLE(DISASSEMBLER)
+#if USE(UDIS86) || (USE(LLVM_DISASSEMBLER) && (CPU(X86_64) || CPU(X86)))
+
+#include "MacroAssemblerCodeRef.h"
+#include "Options.h"
+#include "UDis86Disassembler.h"
+#include "LLVMDisassembler.h"
+
+namespace JSC {
+
+// This horrifying monster is needed because neither of our disassemblers supports
+// all of x86, and using them together to disassemble the same instruction stream
+// would result in a fairly jarring print-out since they print in different
+// styles. Maybe we can do better in the future, but for now the caller hints
+// whether he's using the subset of the architecture that our MacroAssembler
+// supports (in which case we go with UDis86) or if he's using the LLVM subset.
+
+bool tryToDisassemble(const MacroAssemblerCodePtr& codePtr, size_t size, const char* prefix, PrintStream& out, InstructionSubsetHint subsetHint)
+{
+    if (Options::forceUDis86Disassembler())
+        return tryToDisassembleWithUDis86(codePtr, size, prefix, out, subsetHint);
+
+    if (Options::forceLLVMDisassembler())
+        return tryToDisassembleWithLLVM(codePtr, size, prefix, out, subsetHint);
+    
+    if (subsetHint == MacroAssemblerSubset
+        && tryToDisassembleWithUDis86(codePtr, size, prefix, out, MacroAssemblerSubset))
+        return true;
+
+    if (subsetHint == LLVMSubset
+        && tryToDisassembleWithLLVM(codePtr, size, prefix, out, LLVMSubset))
+        return true;
+    
+    if (tryToDisassembleWithUDis86(codePtr, size, prefix, out, subsetHint))
+        return true;
+    if (tryToDisassembleWithLLVM(codePtr, size, prefix, out, subsetHint))
+        return true;
+    
+    RELEASE_ASSERT_NOT_REACHED();
+    return false;
+}
+
+} // namespace JSC
+
+#endif // USE(UDIS86) || USE(LLVM_DISASSEMBLER)
+#endif // ENABLE(DISASSEMBLER)