--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/JavaScriptCore/assembler/CodeLocation.h	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,185 @@
+/*
+ * Copyright (C) 2009 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. 
+ */
+
+#ifndef CodeLocation_h
+#define CodeLocation_h
+
+
+#include <MacroAssemblerCodeRef.h>
+
+#if ENABLE(ASSEMBLER)
+
+namespace JSC {
+
+class CodeLocationInstruction;
+class CodeLocationLabel;
+class CodeLocationJump;
+class CodeLocationCall;
+class CodeLocationNearCall;
+class CodeLocationDataLabel32;
+class CodeLocationDataLabelPtr;
+
+// The CodeLocation* types are all pretty much do-nothing wrappers around
+// CodePtr (or MacroAssemblerCodePtr, to give it its full name).  These
+// classes only exist to provide type-safety when linking and patching code.
+//
+// The one new piece of functionallity introduced by these classes is the
+// ability to create (or put another way, to re-discover) another CodeLocation
+// at an offset from one you already know.  When patching code to optimize it
+// we often want to patch a number of instructions that are short, fixed
+// offsets apart.  To reduce memory overhead we will only retain a pointer to
+// one of the instructions, and we will use the *AtOffset methods provided by
+// CodeLocationCommon to find the other points in the code to modify.
+class CodeLocationCommon : public MacroAssemblerCodePtr {
+public:
+    CodeLocationInstruction instructionAtOffset(int offset);
+    CodeLocationLabel labelAtOffset(int offset);
+    CodeLocationJump jumpAtOffset(int offset);
+    CodeLocationCall callAtOffset(int offset);
+    CodeLocationNearCall nearCallAtOffset(int offset);
+    CodeLocationDataLabelPtr dataLabelPtrAtOffset(int offset);
+    CodeLocationDataLabel32 dataLabel32AtOffset(int offset);
+
+protected:
+    CodeLocationCommon()
+    {
+    }
+
+    CodeLocationCommon(MacroAssemblerCodePtr location)
+        : MacroAssemblerCodePtr(location)
+    {
+    }
+};
+
+class CodeLocationInstruction : public CodeLocationCommon {
+public:
+    CodeLocationInstruction() {}
+    explicit CodeLocationInstruction(MacroAssemblerCodePtr location)
+        : CodeLocationCommon(location) {}
+    explicit CodeLocationInstruction(void* location)
+        : CodeLocationCommon(MacroAssemblerCodePtr(location)) {}
+};
+
+class CodeLocationLabel : public CodeLocationCommon {
+public:
+    CodeLocationLabel() {}
+    explicit CodeLocationLabel(MacroAssemblerCodePtr location)
+        : CodeLocationCommon(location) {}
+    explicit CodeLocationLabel(void* location)
+        : CodeLocationCommon(MacroAssemblerCodePtr(location)) {}
+};
+
+class CodeLocationJump : public CodeLocationCommon {
+public:
+    CodeLocationJump() {}
+    explicit CodeLocationJump(MacroAssemblerCodePtr location)
+        : CodeLocationCommon(location) {}
+    explicit CodeLocationJump(void* location)
+        : CodeLocationCommon(MacroAssemblerCodePtr(location)) {}
+};
+
+class CodeLocationCall : public CodeLocationCommon {
+public:
+    CodeLocationCall() {}
+    explicit CodeLocationCall(MacroAssemblerCodePtr location)
+        : CodeLocationCommon(location) {}
+    explicit CodeLocationCall(void* location)
+        : CodeLocationCommon(MacroAssemblerCodePtr(location)) {}
+};
+
+class CodeLocationNearCall : public CodeLocationCommon {
+public:
+    CodeLocationNearCall() {}
+    explicit CodeLocationNearCall(MacroAssemblerCodePtr location)
+        : CodeLocationCommon(location) {}
+    explicit CodeLocationNearCall(void* location)
+        : CodeLocationCommon(MacroAssemblerCodePtr(location)) {}
+};
+
+class CodeLocationDataLabel32 : public CodeLocationCommon {
+public:
+    CodeLocationDataLabel32() {}
+    explicit CodeLocationDataLabel32(MacroAssemblerCodePtr location)
+        : CodeLocationCommon(location) {}
+    explicit CodeLocationDataLabel32(void* location)
+        : CodeLocationCommon(MacroAssemblerCodePtr(location)) {}
+};
+
+class CodeLocationDataLabelPtr : public CodeLocationCommon {
+public:
+    CodeLocationDataLabelPtr() {}
+    explicit CodeLocationDataLabelPtr(MacroAssemblerCodePtr location)
+        : CodeLocationCommon(location) {}
+    explicit CodeLocationDataLabelPtr(void* location)
+        : CodeLocationCommon(MacroAssemblerCodePtr(location)) {}
+};
+
+inline CodeLocationInstruction CodeLocationCommon::instructionAtOffset(int offset)
+{
+    ASSERT_VALID_CODE_OFFSET(offset);
+    return CodeLocationInstruction(reinterpret_cast<char*>(dataLocation()) + offset);
+}
+
+inline CodeLocationLabel CodeLocationCommon::labelAtOffset(int offset)
+{
+    ASSERT_VALID_CODE_OFFSET(offset);
+    return CodeLocationLabel(reinterpret_cast<char*>(dataLocation()) + offset);
+}
+
+inline CodeLocationJump CodeLocationCommon::jumpAtOffset(int offset)
+{
+    ASSERT_VALID_CODE_OFFSET(offset);
+    return CodeLocationJump(reinterpret_cast<char*>(dataLocation()) + offset);
+}
+
+inline CodeLocationCall CodeLocationCommon::callAtOffset(int offset)
+{
+    ASSERT_VALID_CODE_OFFSET(offset);
+    return CodeLocationCall(reinterpret_cast<char*>(dataLocation()) + offset);
+}
+
+inline CodeLocationNearCall CodeLocationCommon::nearCallAtOffset(int offset)
+{
+    ASSERT_VALID_CODE_OFFSET(offset);
+    return CodeLocationNearCall(reinterpret_cast<char*>(dataLocation()) + offset);
+}
+
+inline CodeLocationDataLabelPtr CodeLocationCommon::dataLabelPtrAtOffset(int offset)
+{
+    ASSERT_VALID_CODE_OFFSET(offset);
+    return CodeLocationDataLabelPtr(reinterpret_cast<char*>(dataLocation()) + offset);
+}
+
+inline CodeLocationDataLabel32 CodeLocationCommon::dataLabel32AtOffset(int offset)
+{
+    ASSERT_VALID_CODE_OFFSET(offset);
+    return CodeLocationDataLabel32(reinterpret_cast<char*>(dataLocation()) + offset);
+}
+
+} // namespace JSC
+
+#endif // ENABLE(ASSEMBLER)
+
+#endif // CodeLocation_h