Imported WebKit commit e89504fa9195b2063b2530961d4b73dd08de3242 (http://svn.webkit.org/repository/webkit/trunk@135485)

Change-Id: I03774e5ac79721c13ffa30d152537a74d0b12e66
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>

1 files changed, 101 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/jit/JITDisassembler.cpp b/Source/JavaScriptCore/jit/JITDisassembler.cpp
new file mode 100644
index 000000000..35b939913
--- /dev/null
+++ b/Source/JavaScriptCore/jit/JITDisassembler.cpp
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2012 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 "JITDisassembler.h"
+
+#if ENABLE(JIT)
+
+#include "CodeBlock.h"
+#include "JIT.h"
+
+namespace JSC {
+
+JITDisassembler::JITDisassembler(CodeBlock *codeBlock)
+    : m_codeBlock(codeBlock)
+    , m_labelForBytecodeIndexInMainPath(codeBlock->instructionCount())
+    , m_labelForBytecodeIndexInSlowPath(codeBlock->instructionCount())
+{
+}
+
+JITDisassembler::~JITDisassembler()
+{
+}
+
+void JITDisassembler::dump(LinkBuffer& linkBuffer)
+{
+    dataLogF("Baseline JIT code for CodeBlock %p, instruction count = %u:\n", m_codeBlock, m_codeBlock->instructionCount());
+    dataLogF("    Code at [%p, %p):\n", linkBuffer.debugAddress(), static_cast<char*>(linkBuffer.debugAddress()) + linkBuffer.debugSize());
+    dumpDisassembly(linkBuffer, m_startOfCode, m_labelForBytecodeIndexInMainPath[0]);
+    
+    MacroAssembler::Label firstSlowLabel;
+    for (unsigned i = 0; i < m_labelForBytecodeIndexInSlowPath.size(); ++i) {
+        if (m_labelForBytecodeIndexInSlowPath[i].isSet()) {
+            firstSlowLabel = m_labelForBytecodeIndexInSlowPath[i];
+            break;
+        }
+    }
+    dumpForInstructions(linkBuffer, "    ", m_labelForBytecodeIndexInMainPath, firstSlowLabel.isSet() ? firstSlowLabel : m_endOfSlowPath);
+    dataLogF("    (End Of Main Path)\n");
+    dumpForInstructions(linkBuffer, "    (S) ", m_labelForBytecodeIndexInSlowPath, m_endOfSlowPath);
+    dataLogF("    (End Of Slow Path)\n");
+
+    dumpDisassembly(linkBuffer, m_endOfSlowPath, m_endOfCode);
+}
+
+void JITDisassembler::dumpForInstructions(LinkBuffer& linkBuffer, const char* prefix, Vector<MacroAssembler::Label>& labels, MacroAssembler::Label endLabel)
+{
+    for (unsigned i = 0 ; i < labels.size();) {
+        if (!labels[i].isSet()) {
+            i++;
+            continue;
+        }
+        dataLogF("%s", prefix);
+        m_codeBlock->dump(i);
+        for (unsigned nextIndex = i + 1; ; nextIndex++) {
+            if (nextIndex >= labels.size()) {
+                dumpDisassembly(linkBuffer, labels[i], endLabel);
+                return;
+            }
+            if (labels[nextIndex].isSet()) {
+                dumpDisassembly(linkBuffer, labels[i], labels[nextIndex]);
+                i = nextIndex;
+                break;
+            }
+        }
+    }
+}
+
+void JITDisassembler::dumpDisassembly(LinkBuffer& linkBuffer, MacroAssembler::Label from, MacroAssembler::Label to)
+{
+    CodeLocationLabel fromLocation = linkBuffer.locationOf(from);
+    CodeLocationLabel toLocation = linkBuffer.locationOf(to);
+    disassemble(fromLocation, bitwise_cast<uintptr_t>(toLocation.executableAddress()) - bitwise_cast<uintptr_t>(fromLocation.executableAddress()), "        ", WTF::dataFile());
+}
+
+} // namespace JSC
+
+#endif // ENABLE(JIT)
+