예제 #1
0
MacroAssemblerCodeRef osrExitGenerationThunkGenerator(VM* vm)
{
    MacroAssembler jit;

    // This needs to happen before we use the scratch buffer because this function also uses the scratch buffer.
    adjustFrameAndStackInOSRExitCompilerThunk<DFG::JITCode>(jit, vm, JITCode::DFGJIT);
    
    size_t scratchSize = sizeof(EncodedJSValue) * (GPRInfo::numberOfRegisters + FPRInfo::numberOfRegisters);
    ScratchBuffer* scratchBuffer = vm->scratchBufferForSize(scratchSize);
    EncodedJSValue* buffer = static_cast<EncodedJSValue*>(scratchBuffer->dataBuffer());
    
    for (unsigned i = 0; i < GPRInfo::numberOfRegisters; ++i) {
#if USE(JSVALUE64)
        jit.store64(GPRInfo::toRegister(i), buffer + i);
#else
        jit.store32(GPRInfo::toRegister(i), buffer + i);
#endif
    }
    for (unsigned i = 0; i < FPRInfo::numberOfRegisters; ++i) {
        jit.move(MacroAssembler::TrustedImmPtr(buffer + GPRInfo::numberOfRegisters + i), GPRInfo::regT0);
        jit.storeDouble(FPRInfo::toRegister(i), MacroAssembler::Address(GPRInfo::regT0));
    }
    
    // Tell GC mark phase how much of the scratch buffer is active during call.
    jit.move(MacroAssembler::TrustedImmPtr(scratchBuffer->activeLengthPtr()), GPRInfo::regT0);
    jit.storePtr(MacroAssembler::TrustedImmPtr(scratchSize), MacroAssembler::Address(GPRInfo::regT0));

    // Set up one argument.
#if CPU(X86)
    jit.poke(GPRInfo::callFrameRegister, 0);
#else
    jit.move(GPRInfo::callFrameRegister, GPRInfo::argumentGPR0);
#endif

    MacroAssembler::Call functionCall = jit.call();

    jit.move(MacroAssembler::TrustedImmPtr(scratchBuffer->activeLengthPtr()), GPRInfo::regT0);
    jit.storePtr(MacroAssembler::TrustedImmPtr(0), MacroAssembler::Address(GPRInfo::regT0));

    for (unsigned i = 0; i < FPRInfo::numberOfRegisters; ++i) {
        jit.move(MacroAssembler::TrustedImmPtr(buffer + GPRInfo::numberOfRegisters + i), GPRInfo::regT0);
        jit.loadDouble(MacroAssembler::Address(GPRInfo::regT0), FPRInfo::toRegister(i));
    }
    for (unsigned i = 0; i < GPRInfo::numberOfRegisters; ++i) {
#if USE(JSVALUE64)
        jit.load64(buffer + i, GPRInfo::toRegister(i));
#else
        jit.load32(buffer + i, GPRInfo::toRegister(i));
#endif
    }
    
    jit.jump(MacroAssembler::AbsoluteAddress(&vm->osrExitJumpDestination));
    
    LinkBuffer patchBuffer(*vm, jit, GLOBAL_THUNK_ID);
    
    patchBuffer.link(functionCall, compileOSRExit);
    
    return FINALIZE_CODE(patchBuffer, ("DFG OSR exit generation thunk"));
}
예제 #2
0
MacroAssemblerCodeRef osrExitGenerationThunkGenerator(JSGlobalData* globalData)
{
    MacroAssembler jit;
    
    size_t scratchSize = sizeof(EncodedJSValue) * (GPRInfo::numberOfRegisters + FPRInfo::numberOfRegisters);
    ScratchBuffer* scratchBuffer = globalData->scratchBufferForSize(scratchSize);
    EncodedJSValue* buffer = static_cast<EncodedJSValue*>(scratchBuffer->dataBuffer());
    
    for (unsigned i = 0; i < GPRInfo::numberOfRegisters; ++i)
        jit.storePtr(GPRInfo::toRegister(i), buffer + i);
    for (unsigned i = 0; i < FPRInfo::numberOfRegisters; ++i) {
        jit.move(MacroAssembler::TrustedImmPtr(buffer + GPRInfo::numberOfRegisters + i), GPRInfo::regT0);
        jit.storeDouble(FPRInfo::toRegister(i), GPRInfo::regT0);
    }
    
    // Tell GC mark phase how much of the scratch buffer is active during call.
    jit.move(MacroAssembler::TrustedImmPtr(scratchBuffer->activeLengthPtr()), GPRInfo::regT0);
    jit.storePtr(MacroAssembler::TrustedImmPtr(scratchSize), GPRInfo::regT0);

    // Set up one argument.
#if CPU(X86)
    jit.poke(GPRInfo::callFrameRegister, 0);
#else
    jit.move(GPRInfo::callFrameRegister, GPRInfo::argumentGPR0);
#endif

    MacroAssembler::Call functionCall = jit.call();

    jit.move(MacroAssembler::TrustedImmPtr(scratchBuffer->activeLengthPtr()), GPRInfo::regT0);
    jit.storePtr(MacroAssembler::TrustedImmPtr(0), GPRInfo::regT0);

    for (unsigned i = 0; i < FPRInfo::numberOfRegisters; ++i) {
        jit.move(MacroAssembler::TrustedImmPtr(buffer + GPRInfo::numberOfRegisters + i), GPRInfo::regT0);
        jit.loadDouble(GPRInfo::regT0, FPRInfo::toRegister(i));
    }
    for (unsigned i = 0; i < GPRInfo::numberOfRegisters; ++i)
        jit.loadPtr(buffer + i, GPRInfo::toRegister(i));
    
    jit.jump(MacroAssembler::AbsoluteAddress(&globalData->osrExitJumpDestination));
    
    LinkBuffer patchBuffer(*globalData, &jit, GLOBAL_THUNK_ID);
    
    patchBuffer.link(functionCall, compileOSRExit);
    
    return FINALIZE_CODE(patchBuffer, ("DFG OSR exit generation thunk"));
}
예제 #3
0
MacroAssemblerCodeRef osrExitGenerationThunkGenerator(VM* vm)
{
    AssemblyHelpers jit(vm, 0);
    
    // Note that the "return address" will be the OSR exit ID.
    
    ptrdiff_t stackMisalignment = MacroAssembler::pushToSaveByteOffset();
    
    // Pretend that we're a C call frame.
    jit.pushToSave(MacroAssembler::framePointerRegister);
    jit.move(MacroAssembler::stackPointerRegister, MacroAssembler::framePointerRegister);
    stackMisalignment += MacroAssembler::pushToSaveByteOffset();
    
    // Now create ourselves enough stack space to give saveAllRegisters() a scratch slot.
    unsigned numberOfRequiredPops = 0;
    do {
        jit.pushToSave(GPRInfo::regT0);
        stackMisalignment += MacroAssembler::pushToSaveByteOffset();
        numberOfRequiredPops++;
    } while (stackMisalignment % stackAlignmentBytes());
    
    ScratchBuffer* scratchBuffer = vm->scratchBufferForSize(requiredScratchMemorySizeInBytes());
    char* buffer = static_cast<char*>(scratchBuffer->dataBuffer());
    
    saveAllRegisters(jit, buffer);
    
    // Tell GC mark phase how much of the scratch buffer is active during call.
    jit.move(MacroAssembler::TrustedImmPtr(scratchBuffer->activeLengthPtr()), GPRInfo::nonArgGPR1);
    jit.storePtr(MacroAssembler::TrustedImmPtr(requiredScratchMemorySizeInBytes()), GPRInfo::nonArgGPR1);

    jit.loadPtr(GPRInfo::callFrameRegister, GPRInfo::argumentGPR0);
    jit.peek(
        GPRInfo::argumentGPR1,
        (stackMisalignment - MacroAssembler::pushToSaveByteOffset()) / sizeof(void*));
    MacroAssembler::Call functionCall = jit.call();
    
    // At this point we want to make a tail call to what was returned to us in the
    // returnValueGPR. But at the same time as we do this, we must restore all registers.
    // The way we will accomplish this is by arranging to have the tail call target in the
    // return address "slot" (be it a register or the stack).
    
    jit.move(GPRInfo::returnValueGPR, GPRInfo::regT0);
    
    // Make sure we tell the GC that we're not using the scratch buffer anymore.
    jit.move(MacroAssembler::TrustedImmPtr(scratchBuffer->activeLengthPtr()), GPRInfo::regT1);
    jit.storePtr(MacroAssembler::TrustedImmPtr(0), GPRInfo::regT1);
    
    // Prepare for tail call.
    while (numberOfRequiredPops--)
        jit.popToRestore(GPRInfo::regT1);
    jit.popToRestore(MacroAssembler::framePointerRegister);
    
    // At this point we're sitting on the return address - so if we did a jump right now, the
    // tail-callee would be happy. Instead we'll stash the callee in the return address and then
    // restore all registers.
    
    jit.restoreReturnAddressBeforeReturn(GPRInfo::regT0);

    restoreAllRegisters(jit, buffer);

    jit.ret();
    
    LinkBuffer patchBuffer(*vm, jit, GLOBAL_THUNK_ID);
    patchBuffer.link(functionCall, compileFTLOSRExit);
    return FINALIZE_CODE(patchBuffer, ("FTL OSR exit generation thunk"));
}