dfg/DFGThunks.cpp

   1 /*
   2  * Copyright (C) 2011, 2014 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "DFGThunks.h"
  28
  29 #if ENABLE(DFG_JIT)
  30
  31 #include "CCallHelpers.h"
  32 #include "DFGOSRExitCompiler.h"
  33 #include "FPRInfo.h"
  34 #include "GPRInfo.h"
  35 #include "LinkBuffer.h"
  36 #include "MacroAssembler.h"
  37 #include "JSCInlines.h"
  38
  39 namespace JSC { namespace DFG {
  40
  41 MacroAssemblerCodeRef osrExitGenerationThunkGenerator(VM* vm)
  42 {
  43     MacroAssembler jit;
  44
  45     size_t scratchSize = sizeof(EncodedJSValue) * (GPRInfo::numberOfRegisters + FPRInfo::numberOfRegisters);
  46     ScratchBuffer* scratchBuffer = vm->scratchBufferForSize(scratchSize);
  47     EncodedJSValue* buffer = static_cast<EncodedJSValue*>(scratchBuffer->dataBuffer());
  48
  49     for (unsigned i = 0; i < GPRInfo::numberOfRegisters; ++i) {
  50 #if USE(JSVALUE64)
  51         jit.store64(GPRInfo::toRegister(i), buffer + i);
  52 #else
  53         jit.store32(GPRInfo::toRegister(i), buffer + i);
  54 #endif
  55     }
  56     for (unsigned i = 0; i < FPRInfo::numberOfRegisters; ++i) {
  57         jit.move(MacroAssembler::TrustedImmPtr(buffer + GPRInfo::numberOfRegisters + i), GPRInfo::regT0);
  58         jit.storeDouble(FPRInfo::toRegister(i), MacroAssembler::Address(GPRInfo::regT0));
  59     }
  60
  61     // Tell GC mark phase how much of the scratch buffer is active during call.
  62     jit.move(MacroAssembler::TrustedImmPtr(scratchBuffer->activeLengthPtr()), GPRInfo::regT0);
  63     jit.storePtr(MacroAssembler::TrustedImmPtr(scratchSize), MacroAssembler::Address(GPRInfo::regT0));
  64
  65     // Set up one argument.
  66 #if CPU(X86)
  67     jit.poke(GPRInfo::callFrameRegister, 0);
  68 #else
  69     jit.move(GPRInfo::callFrameRegister, GPRInfo::argumentGPR0);
  70 #endif
  71
  72     MacroAssembler::Call functionCall = jit.call();
  73
  74     jit.move(MacroAssembler::TrustedImmPtr(scratchBuffer->activeLengthPtr()), GPRInfo::regT0);
  75     jit.storePtr(MacroAssembler::TrustedImmPtr(0), MacroAssembler::Address(GPRInfo::regT0));
  76
  77     for (unsigned i = 0; i < FPRInfo::numberOfRegisters; ++i) {
  78         jit.move(MacroAssembler::TrustedImmPtr(buffer + GPRInfo::numberOfRegisters + i), GPRInfo::regT0);
  79         jit.loadDouble(MacroAssembler::Address(GPRInfo::regT0), FPRInfo::toRegister(i));
  80     }
  81     for (unsigned i = 0; i < GPRInfo::numberOfRegisters; ++i) {
  82 #if USE(JSVALUE64)
  83         jit.load64(buffer + i, GPRInfo::toRegister(i));
  84 #else
  85         jit.load32(buffer + i, GPRInfo::toRegister(i));
  86 #endif
  87     }
  88
  89     jit.jump(MacroAssembler::AbsoluteAddress(&vm->osrExitJumpDestination));
  90
  91     LinkBuffer patchBuffer(*vm, jit, GLOBAL_THUNK_ID);
  92
  93     patchBuffer.link(functionCall, compileOSRExit);
  94
  95     return FINALIZE_CODE(patchBuffer, ("DFG OSR exit generation thunk"));
  96 }
  97
  98 MacroAssemblerCodeRef osrEntryThunkGenerator(VM* vm)
  99 {
 100     MacroAssembler jit;
 101
 102     // We get passed the address of a scratch buffer. The first 8-byte slot of the buffer
 103     // is the frame size. The second 8-byte slot is the pointer to where we are supposed to
 104     // jump. The remaining bytes are the new call frame header followed by the locals.
 105
 106     ptrdiff_t offsetOfFrameSize = 0; // This is the DFG frame count.
 107     ptrdiff_t offsetOfTargetPC = offsetOfFrameSize + sizeof(EncodedJSValue);
 108     ptrdiff_t offsetOfPayload = offsetOfTargetPC + sizeof(EncodedJSValue);
 109     ptrdiff_t offsetOfLocals = offsetOfPayload + sizeof(Register) * JSStack::CallFrameHeaderSize;
 110
 111     jit.move(GPRInfo::returnValueGPR2, GPRInfo::regT0);
 112     jit.loadPtr(MacroAssembler::Address(GPRInfo::regT0, offsetOfFrameSize), GPRInfo::regT1); // Load the frame size.
 113     jit.move(GPRInfo::regT1, GPRInfo::regT2);
 114     jit.lshiftPtr(MacroAssembler::Imm32(3), GPRInfo::regT2);
 115     jit.move(GPRInfo::callFrameRegister, MacroAssembler::stackPointerRegister);
 116     jit.subPtr(GPRInfo::regT2, MacroAssembler::stackPointerRegister);
 117
 118     MacroAssembler::Label loop = jit.label();
 119     jit.subPtr(MacroAssembler::TrustedImm32(1), GPRInfo::regT1);
 120     jit.move(GPRInfo::regT1, GPRInfo::regT4);
 121     jit.negPtr(GPRInfo::regT4);
 122     jit.load32(MacroAssembler::BaseIndex(GPRInfo::regT0, GPRInfo::regT1, MacroAssembler::TimesEight, offsetOfLocals), GPRInfo::regT2);
 123     jit.load32(MacroAssembler::BaseIndex(GPRInfo::regT0, GPRInfo::regT1, MacroAssembler::TimesEight, offsetOfLocals + sizeof(int32_t)), GPRInfo::regT3);
 124     jit.store32(GPRInfo::regT2, MacroAssembler::BaseIndex(GPRInfo::callFrameRegister, GPRInfo::regT4, MacroAssembler::TimesEight, -static_cast<intptr_t>(sizeof(Register))));
 125     jit.store32(GPRInfo::regT3, MacroAssembler::BaseIndex(GPRInfo::callFrameRegister, GPRInfo::regT4, MacroAssembler::TimesEight, -static_cast<intptr_t>(sizeof(Register)) + static_cast<intptr_t>(sizeof(int32_t))));
 126     jit.branchPtr(MacroAssembler::NotEqual, GPRInfo::regT1, MacroAssembler::TrustedImmPtr(bitwise_cast<void*>(-static_cast<intptr_t>(JSStack::CallFrameHeaderSize)))).linkTo(loop, &jit);
 127
 128     jit.loadPtr(MacroAssembler::Address(GPRInfo::regT0, offsetOfTargetPC), GPRInfo::regT1);
 129     MacroAssembler::Jump ok = jit.branchPtr(MacroAssembler::Above, GPRInfo::regT1, MacroAssembler::TrustedImmPtr(bitwise_cast<void*>(static_cast<intptr_t>(1000))));
 130     jit.abortWithReason(DFGUnreasonableOSREntryJumpDestination);
 131     ok.link(&jit);
 132     jit.jump(GPRInfo::regT1);
 133
 134     LinkBuffer patchBuffer(*vm, jit, GLOBAL_THUNK_ID);
 135     return FINALIZE_CODE(patchBuffer, ("DFG OSR entry thunk"));
 136 }
 137
 138 } } // namespace JSC::DFG
 139
 140 #endif // ENABLE(DFG_JIT)