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Diffstat (limited to 'Source/JavaScriptCore/jit/SpecializedThunkJIT.h')
| -rw-r--r-- | Source/JavaScriptCore/jit/SpecializedThunkJIT.h | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/jit/SpecializedThunkJIT.h b/Source/JavaScriptCore/jit/SpecializedThunkJIT.h new file mode 100644 index 000000000..1802216fa --- /dev/null +++ b/Source/JavaScriptCore/jit/SpecializedThunkJIT.h @@ -0,0 +1,179 @@ +/* + * Copyright (C) 2010 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. AND ITS CONTRIBUTORS ``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 ITS 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 SpecializedThunkJIT_h +#define SpecializedThunkJIT_h + +#if ENABLE(JIT) + +#include "Executable.h" +#include "JSInterfaceJIT.h" +#include "LinkBuffer.h" + +namespace JSC { + + class SpecializedThunkJIT : public JSInterfaceJIT { + public: + static const int ThisArgument = -1; + SpecializedThunkJIT(int expectedArgCount, JSGlobalData* globalData) + : m_expectedArgCount(expectedArgCount) + , m_globalData(globalData) + { + // Check that we have the expected number of arguments + m_failures.append(branch32(NotEqual, payloadFor(RegisterFile::ArgumentCount), TrustedImm32(expectedArgCount + 1))); + } + + void loadDoubleArgument(int argument, FPRegisterID dst, RegisterID scratch) + { + unsigned src = CallFrame::argumentOffset(argument); + m_failures.append(emitLoadDouble(src, dst, scratch)); + } + + void loadCellArgument(int argument, RegisterID dst) + { + unsigned src = CallFrame::argumentOffset(argument); + m_failures.append(emitLoadJSCell(src, dst)); + } + + void loadJSStringArgument(int argument, RegisterID dst) + { + loadCellArgument(argument, dst); + m_failures.append(branchPtr(NotEqual, Address(dst, JSCell::classInfoOffset()), TrustedImmPtr(&JSString::s_info))); + } + + void loadInt32Argument(int argument, RegisterID dst, Jump& failTarget) + { + unsigned src = CallFrame::argumentOffset(argument); + failTarget = emitLoadInt32(src, dst); + } + + void loadInt32Argument(int argument, RegisterID dst) + { + Jump conversionFailed; + loadInt32Argument(argument, dst, conversionFailed); + m_failures.append(conversionFailed); + } + + void appendFailure(const Jump& failure) + { + m_failures.append(failure); + } + + void returnJSValue(RegisterID src) + { + if (src != regT0) + move(src, regT0); + loadPtr(payloadFor(RegisterFile::CallerFrame, callFrameRegister), callFrameRegister); + ret(); + } + + void returnDouble(FPRegisterID src) + { +#if USE(JSVALUE64) + moveDoubleToPtr(src, regT0); + Jump zero = branchTestPtr(Zero, regT0); + subPtr(tagTypeNumberRegister, regT0); + Jump done = jump(); + zero.link(this); + move(tagTypeNumberRegister, regT0); + done.link(this); +#else + storeDouble(src, Address(stackPointerRegister, -(int)sizeof(double))); + loadPtr(Address(stackPointerRegister, OBJECT_OFFSETOF(JSValue, u.asBits.tag) - sizeof(double)), regT1); + loadPtr(Address(stackPointerRegister, OBJECT_OFFSETOF(JSValue, u.asBits.payload) - sizeof(double)), regT0); + Jump lowNonZero = branchTestPtr(NonZero, regT1); + Jump highNonZero = branchTestPtr(NonZero, regT0); + move(TrustedImm32(0), regT0); + move(TrustedImm32(Int32Tag), regT1); + lowNonZero.link(this); + highNonZero.link(this); +#endif + loadPtr(payloadFor(RegisterFile::CallerFrame, callFrameRegister), callFrameRegister); + ret(); + } + + void returnInt32(RegisterID src) + { + if (src != regT0) + move(src, regT0); + tagReturnAsInt32(); + loadPtr(payloadFor(RegisterFile::CallerFrame, callFrameRegister), callFrameRegister); + ret(); + } + + void returnJSCell(RegisterID src) + { + if (src != regT0) + move(src, regT0); + tagReturnAsJSCell(); + loadPtr(payloadFor(RegisterFile::CallerFrame, callFrameRegister), callFrameRegister); + ret(); + } + + MacroAssemblerCodeRef finalize(JSGlobalData& globalData, MacroAssemblerCodePtr fallback) + { + LinkBuffer patchBuffer(globalData, this); + patchBuffer.link(m_failures, CodeLocationLabel(fallback)); + for (unsigned i = 0; i < m_calls.size(); i++) + patchBuffer.link(m_calls[i].first, m_calls[i].second); + return patchBuffer.finalizeCode(); + } + + // Assumes that the target function uses fpRegister0 as the first argument + // and return value. Like any sensible architecture would. + void callDoubleToDouble(FunctionPtr function) + { + m_calls.append(std::make_pair(call(), function)); + } + + private: + + void tagReturnAsInt32() + { +#if USE(JSVALUE64) + orPtr(tagTypeNumberRegister, regT0); +#else + move(TrustedImm32(JSValue::Int32Tag), regT1); +#endif + } + + void tagReturnAsJSCell() + { +#if USE(JSVALUE32_64) + move(TrustedImm32(JSValue::CellTag), regT1); +#endif + } + + int m_expectedArgCount; + JSGlobalData* m_globalData; + MacroAssembler::JumpList m_failures; + Vector<std::pair<Call, FunctionPtr> > m_calls; + }; + +} + +#endif // ENABLE(JIT) + +#endif // SpecializedThunkJIT_h |