author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 17 Sep 2010 09:02:29 +0300 | |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (C) 2009 Apple Inc. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#ifndef CodeLocation_h |
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#define CodeLocation_h |
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#include <MacroAssemblerCodeRef.h> |
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#if ENABLE(ASSEMBLER) |
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namespace JSC { |
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class CodeLocationInstruction; |
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class CodeLocationLabel; |
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class CodeLocationJump; |
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class CodeLocationCall; |
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class CodeLocationNearCall; |
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class CodeLocationDataLabel32; |
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class CodeLocationDataLabelPtr; |
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// The CodeLocation* types are all pretty much do-nothing wrappers around |
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// CodePtr (or MacroAssemblerCodePtr, to give it its full name). These |
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// classes only exist to provide type-safety when linking and patching code. |
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// |
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// The one new piece of functionallity introduced by these classes is the |
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// ability to create (or put another way, to re-discover) another CodeLocation |
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// at an offset from one you already know. When patching code to optimize it |
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// we often want to patch a number of instructions that are short, fixed |
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// offsets apart. To reduce memory overhead we will only retain a pointer to |
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// one of the instructions, and we will use the *AtOffset methods provided by |
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// CodeLocationCommon to find the other points in the code to modify. |
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class CodeLocationCommon : public MacroAssemblerCodePtr { |
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public: |
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CodeLocationInstruction instructionAtOffset(int offset); |
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CodeLocationLabel labelAtOffset(int offset); |
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CodeLocationJump jumpAtOffset(int offset); |
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CodeLocationCall callAtOffset(int offset); |
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CodeLocationNearCall nearCallAtOffset(int offset); |
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CodeLocationDataLabelPtr dataLabelPtrAtOffset(int offset); |
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CodeLocationDataLabel32 dataLabel32AtOffset(int offset); |
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protected: |
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CodeLocationCommon() |
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{ |
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} |
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CodeLocationCommon(MacroAssemblerCodePtr location) |
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: MacroAssemblerCodePtr(location) |
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{ |
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} |
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}; |
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class CodeLocationInstruction : public CodeLocationCommon { |
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public: |
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CodeLocationInstruction() {} |
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explicit CodeLocationInstruction(MacroAssemblerCodePtr location) |
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: CodeLocationCommon(location) {} |
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explicit CodeLocationInstruction(void* location) |
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: CodeLocationCommon(MacroAssemblerCodePtr(location)) {} |
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}; |
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class CodeLocationLabel : public CodeLocationCommon { |
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public: |
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CodeLocationLabel() {} |
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explicit CodeLocationLabel(MacroAssemblerCodePtr location) |
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: CodeLocationCommon(location) {} |
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explicit CodeLocationLabel(void* location) |
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: CodeLocationCommon(MacroAssemblerCodePtr(location)) {} |
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}; |
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class CodeLocationJump : public CodeLocationCommon { |
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public: |
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CodeLocationJump() {} |
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explicit CodeLocationJump(MacroAssemblerCodePtr location) |
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: CodeLocationCommon(location) {} |
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explicit CodeLocationJump(void* location) |
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: CodeLocationCommon(MacroAssemblerCodePtr(location)) {} |
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}; |
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class CodeLocationCall : public CodeLocationCommon { |
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public: |
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CodeLocationCall() {} |
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explicit CodeLocationCall(MacroAssemblerCodePtr location) |
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: CodeLocationCommon(location) {} |
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explicit CodeLocationCall(void* location) |
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: CodeLocationCommon(MacroAssemblerCodePtr(location)) {} |
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}; |
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class CodeLocationNearCall : public CodeLocationCommon { |
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public: |
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CodeLocationNearCall() {} |
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explicit CodeLocationNearCall(MacroAssemblerCodePtr location) |
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: CodeLocationCommon(location) {} |
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explicit CodeLocationNearCall(void* location) |
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: CodeLocationCommon(MacroAssemblerCodePtr(location)) {} |
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}; |
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class CodeLocationDataLabel32 : public CodeLocationCommon { |
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public: |
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CodeLocationDataLabel32() {} |
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explicit CodeLocationDataLabel32(MacroAssemblerCodePtr location) |
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: CodeLocationCommon(location) {} |
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explicit CodeLocationDataLabel32(void* location) |
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: CodeLocationCommon(MacroAssemblerCodePtr(location)) {} |
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}; |
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class CodeLocationDataLabelPtr : public CodeLocationCommon { |
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public: |
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CodeLocationDataLabelPtr() {} |
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explicit CodeLocationDataLabelPtr(MacroAssemblerCodePtr location) |
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: CodeLocationCommon(location) {} |
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explicit CodeLocationDataLabelPtr(void* location) |
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: CodeLocationCommon(MacroAssemblerCodePtr(location)) {} |
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}; |
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inline CodeLocationInstruction CodeLocationCommon::instructionAtOffset(int offset) |
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{ |
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ASSERT_VALID_CODE_OFFSET(offset); |
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return CodeLocationInstruction(reinterpret_cast<char*>(dataLocation()) + offset); |
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} |
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inline CodeLocationLabel CodeLocationCommon::labelAtOffset(int offset) |
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{ |
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ASSERT_VALID_CODE_OFFSET(offset); |
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return CodeLocationLabel(reinterpret_cast<char*>(dataLocation()) + offset); |
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} |
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inline CodeLocationJump CodeLocationCommon::jumpAtOffset(int offset) |
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{ |
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ASSERT_VALID_CODE_OFFSET(offset); |
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return CodeLocationJump(reinterpret_cast<char*>(dataLocation()) + offset); |
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} |
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inline CodeLocationCall CodeLocationCommon::callAtOffset(int offset) |
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{ |
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ASSERT_VALID_CODE_OFFSET(offset); |
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return CodeLocationCall(reinterpret_cast<char*>(dataLocation()) + offset); |
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} |
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inline CodeLocationNearCall CodeLocationCommon::nearCallAtOffset(int offset) |
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{ |
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ASSERT_VALID_CODE_OFFSET(offset); |
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return CodeLocationNearCall(reinterpret_cast<char*>(dataLocation()) + offset); |
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} |
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inline CodeLocationDataLabelPtr CodeLocationCommon::dataLabelPtrAtOffset(int offset) |
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{ |
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ASSERT_VALID_CODE_OFFSET(offset); |
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return CodeLocationDataLabelPtr(reinterpret_cast<char*>(dataLocation()) + offset); |
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} |
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inline CodeLocationDataLabel32 CodeLocationCommon::dataLabel32AtOffset(int offset) |
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{ |
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ASSERT_VALID_CODE_OFFSET(offset); |
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return CodeLocationDataLabel32(reinterpret_cast<char*>(dataLocation()) + offset); |
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} |
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} // namespace JSC |
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#endif // ENABLE(ASSEMBLER) |
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#endif // CodeLocation_h |