author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 04 Oct 2010 01:32:07 +0300 | |
changeset 2 | 303757a437d3 |
parent 0 | 4f2f89ce4247 |
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 MacroAssemblerCodeRef_h |
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#define MacroAssemblerCodeRef_h |
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#include "ExecutableAllocator.h" |
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#include "PassRefPtr.h" |
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#include "RefPtr.h" |
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#include "UnusedParam.h" |
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#if ENABLE(ASSEMBLER) |
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// ASSERT_VALID_CODE_POINTER checks that ptr is a non-null pointer, and that it is a valid |
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// instruction address on the platform (for example, check any alignment requirements). |
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#if CPU(ARM_THUMB2) |
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// ARM/thumb instructions must be 16-bit aligned, but all code pointers to be loaded |
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// into the processor are decorated with the bottom bit set, indicating that this is |
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// thumb code (as oposed to 32-bit traditional ARM). The first test checks for both |
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// decorated and undectorated null, and the second test ensures that the pointer is |
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// decorated. |
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#define ASSERT_VALID_CODE_POINTER(ptr) \ |
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ASSERT(reinterpret_cast<intptr_t>(ptr) & ~1); \ |
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ASSERT(reinterpret_cast<intptr_t>(ptr) & 1) |
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#define ASSERT_VALID_CODE_OFFSET(offset) \ |
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ASSERT(!(offset & 1)) // Must be multiple of 2. |
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#else |
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#define ASSERT_VALID_CODE_POINTER(ptr) \ |
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ASSERT(ptr) |
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#define ASSERT_VALID_CODE_OFFSET(offset) // Anything goes! |
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#endif |
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namespace JSC { |
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// FunctionPtr: |
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// |
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// FunctionPtr should be used to wrap pointers to C/C++ functions in JSC |
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// (particularly, the stub functions). |
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class FunctionPtr { |
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public: |
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FunctionPtr() |
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: m_value(0) |
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{ |
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} |
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template<typename FunctionType> |
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explicit FunctionPtr(FunctionType* value) |
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#if COMPILER(RVCT) |
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// RVTC compiler needs C-style cast as it fails with the following error |
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// Error: #694: reinterpret_cast cannot cast away const or other type qualifiers |
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: m_value((void*)(value)) |
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#else |
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: m_value(reinterpret_cast<void*>(value)) |
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#endif |
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{ |
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ASSERT_VALID_CODE_POINTER(m_value); |
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} |
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|
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void* value() const { return m_value; } |
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void* executableAddress() const { return m_value; } |
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|
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private: |
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void* m_value; |
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}; |
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// ReturnAddressPtr: |
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// |
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// ReturnAddressPtr should be used to wrap return addresses generated by processor |
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// 'call' instructions exectued in JIT code. We use return addresses to look up |
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// exception and optimization information, and to repatch the call instruction |
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// that is the source of the return address. |
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class ReturnAddressPtr { |
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public: |
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ReturnAddressPtr() |
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: m_value(0) |
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{ |
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} |
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explicit ReturnAddressPtr(void* value) |
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: m_value(value) |
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{ |
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ASSERT_VALID_CODE_POINTER(m_value); |
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} |
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explicit ReturnAddressPtr(FunctionPtr function) |
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: m_value(function.value()) |
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{ |
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ASSERT_VALID_CODE_POINTER(m_value); |
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} |
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void* value() const { return m_value; } |
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private: |
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void* m_value; |
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}; |
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// MacroAssemblerCodePtr: |
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// |
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// MacroAssemblerCodePtr should be used to wrap pointers to JIT generated code. |
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class MacroAssemblerCodePtr { |
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public: |
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MacroAssemblerCodePtr() |
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: m_value(0) |
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{ |
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} |
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explicit MacroAssemblerCodePtr(void* value) |
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#if CPU(ARM_THUMB2) |
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// Decorate the pointer as a thumb code pointer. |
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: m_value(reinterpret_cast<char*>(value) + 1) |
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#else |
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: m_value(value) |
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#endif |
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{ |
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ASSERT_VALID_CODE_POINTER(m_value); |
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} |
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|
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explicit MacroAssemblerCodePtr(ReturnAddressPtr ra) |
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: m_value(ra.value()) |
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{ |
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ASSERT_VALID_CODE_POINTER(m_value); |
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} |
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void* executableAddress() const { return m_value; } |
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#if CPU(ARM_THUMB2) |
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// To use this pointer as a data address remove the decoration. |
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void* dataLocation() const { ASSERT_VALID_CODE_POINTER(m_value); return reinterpret_cast<char*>(m_value) - 1; } |
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#else |
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void* dataLocation() const { ASSERT_VALID_CODE_POINTER(m_value); return m_value; } |
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#endif |
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bool operator!() |
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{ |
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return !m_value; |
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} |
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private: |
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void* m_value; |
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}; |
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// MacroAssemblerCodeRef: |
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// |
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// A reference to a section of JIT generated code. A CodeRef consists of a |
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// pointer to the code, and a ref pointer to the pool from within which it |
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// was allocated. |
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class MacroAssemblerCodeRef { |
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public: |
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MacroAssemblerCodeRef() |
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: m_size(0) |
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{ |
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} |
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MacroAssemblerCodeRef(void* code, PassRefPtr<ExecutablePool> executablePool, size_t size) |
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: m_code(code) |
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, m_executablePool(executablePool) |
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, m_size(size) |
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{ |
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} |
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|
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MacroAssemblerCodePtr m_code; |
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RefPtr<ExecutablePool> m_executablePool; |
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size_t m_size; |
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}; |
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} // namespace JSC |
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|
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#endif // ENABLE(ASSEMBLER) |
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|
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#endif // MacroAssemblerCodeRef_h |