| /* |
| * Copyright (C) 2013 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 FTLSlowPathCallKey_h |
| #define FTLSlowPathCallKey_h |
| |
| #if ENABLE(FTL_JIT) |
| |
| #include "RegisterSet.h" |
| |
| namespace JSC { namespace FTL { |
| |
| // This is used for creating some sanity in slow-path calls out of the FTL's inline |
| // caches. The idea is that we don't want all of the register save/restore stuff to |
| // be generated at each IC site. Instead, the IC slow path call site will just save |
| // the registers needed for the arguments. It will arrange for there to be enough |
| // space on top of stack to save the remaining registers and the return PC. Then it |
| // will call a shared thunk that will save the remaining registers. That thunk needs |
| // to know the stack offset at which things get saved along with the call target. |
| |
| // Note that the offset is *not including* the return PC that would be pushed on X86. |
| |
| class SlowPathCallKey { |
| public: |
| SlowPathCallKey() |
| : m_callTarget(0) |
| , m_offset(0) |
| { |
| } |
| |
| SlowPathCallKey(const RegisterSet& set, void* callTarget, ptrdiff_t offset) |
| : m_usedRegisters(set) |
| , m_callTarget(callTarget) |
| , m_offset(offset) |
| { |
| } |
| |
| const RegisterSet& usedRegisters() const { return m_usedRegisters; } |
| void* callTarget() const { return m_callTarget; } |
| ptrdiff_t offset() const { return m_offset; } |
| |
| void dump(PrintStream&) const; |
| |
| enum EmptyValueTag { EmptyValue }; |
| enum DeletedValueTag { DeletedValue }; |
| |
| SlowPathCallKey(EmptyValueTag) |
| : m_usedRegisters(RegisterSet::EmptyValue) |
| , m_callTarget(0) |
| , m_offset(0) |
| { |
| } |
| |
| SlowPathCallKey(DeletedValueTag) |
| : m_usedRegisters(RegisterSet::DeletedValue) |
| , m_callTarget(0) |
| , m_offset(0) |
| { |
| } |
| |
| bool isEmptyValue() const { return m_usedRegisters.isEmptyValue(); } |
| bool isDeletedValue() const { return m_usedRegisters.isDeletedValue(); } |
| |
| bool operator==(const SlowPathCallKey& other) const |
| { |
| return m_usedRegisters == other.m_usedRegisters |
| && m_callTarget == other.m_callTarget |
| && m_offset == other.m_offset; |
| } |
| unsigned hash() const |
| { |
| return m_usedRegisters.hash() + PtrHash<void*>::hash(m_callTarget) + m_offset; |
| } |
| |
| private: |
| RegisterSet m_usedRegisters; |
| void* m_callTarget; |
| ptrdiff_t m_offset; |
| }; |
| |
| struct SlowPathCallKeyHash { |
| static unsigned hash(const SlowPathCallKey& key) { return key.hash(); } |
| static bool equal(const SlowPathCallKey& a, const SlowPathCallKey& b) { return a == b; } |
| static const bool safeToCompareToEmptyOrDeleted = false; |
| }; |
| |
| } } // namespace JSC::FTL |
| |
| namespace WTF { |
| |
| template<typename T> struct DefaultHash; |
| template<> struct DefaultHash<JSC::FTL::SlowPathCallKey> { |
| typedef JSC::FTL::SlowPathCallKeyHash Hash; |
| }; |
| |
| template<typename T> struct HashTraits; |
| template<> struct HashTraits<JSC::FTL::SlowPathCallKey> : public CustomHashTraits<JSC::FTL::SlowPathCallKey> { }; |
| |
| } // namespace WTF |
| |
| #endif // ENABLE(FTL_JIT) |
| |
| #endif // FTLSlowPathCallKey_h |
| |