コード例 #1
0
bool
CodeGeneratorX64::visitAsmJSLoadHeap(LAsmJSLoadHeap *ins)
{
    MAsmJSLoadHeap *mir = ins->mir();
    ArrayBufferView::ViewType vt = mir->viewType();

    Operand srcAddr(HeapReg, ToRegister(ins->ptr()), TimesOne);

    if (vt == ArrayBufferView::TYPE_FLOAT32) {
        FloatRegister dest = ToFloatRegister(ins->output());
        uint32_t before = masm.size();
        masm.movss(srcAddr, dest);
        uint32_t after = masm.size();
        masm.cvtss2sd(dest, dest);
        return gen->noteHeapAccess(AsmJSHeapAccess(before, after, vt, ToAnyRegister(ins->output())));
    }

    uint32_t before = masm.size();
    switch (vt) {
      case ArrayBufferView::TYPE_INT8:    masm.movsbl(srcAddr, ToRegister(ins->output())); break;
      case ArrayBufferView::TYPE_UINT8:   masm.movzbl(srcAddr, ToRegister(ins->output())); break;
      case ArrayBufferView::TYPE_INT16:   masm.movswl(srcAddr, ToRegister(ins->output())); break;
      case ArrayBufferView::TYPE_UINT16:  masm.movzwl(srcAddr, ToRegister(ins->output())); break;
      case ArrayBufferView::TYPE_INT32:   masm.movl(srcAddr, ToRegister(ins->output())); break;
      case ArrayBufferView::TYPE_UINT32:  masm.movl(srcAddr, ToRegister(ins->output())); break;
      case ArrayBufferView::TYPE_FLOAT64: masm.movsd(srcAddr, ToFloatRegister(ins->output())); break;
      default: MOZ_ASSUME_UNREACHABLE("unexpected array type");
    }
    uint32_t after = masm.size();
    return gen->noteHeapAccess(AsmJSHeapAccess(before, after, vt, ToAnyRegister(ins->output())));
}
コード例 #2
0
void
CodeGeneratorX64::emitSimdLoad(LAsmJSLoadHeap *ins)
{
    MAsmJSLoadHeap *mir = ins->mir();
    Scalar::Type type = mir->accessType();
    const LAllocation *ptr = ins->ptr();
    FloatRegister out = ToFloatRegister(ins->output());
    Operand srcAddr(HeapReg);

    if (ptr->isConstant()) {
        int32_t ptrImm = ptr->toConstant()->toInt32();
        MOZ_ASSERT(ptrImm >= 0);
        srcAddr = Operand(HeapReg, ptrImm);
    } else {
        srcAddr = Operand(HeapReg, ToRegister(ptr), TimesOne);
    }

    uint32_t maybeCmpOffset = AsmJSHeapAccess::NoLengthCheck;
    if (mir->needsBoundsCheck()) {
        maybeCmpOffset = masm.cmp32WithPatch(ToRegister(ptr), Imm32(0)).offset();
        masm.j(Assembler::AboveOrEqual, mir->outOfBoundsLabel()); // Throws RangeError
    }

    unsigned numElems = mir->numSimdElems();
    if (numElems == 3) {
        MOZ_ASSERT(type == Scalar::Int32x4 || type == Scalar::Float32x4);

        Operand shiftedOffset(HeapReg);
        if (ptr->isConstant())
            shiftedOffset = Operand(HeapReg, ptr->toConstant()->toInt32() + 2 * sizeof(float));
        else
            shiftedOffset = Operand(HeapReg, ToRegister(ptr), TimesOne, 2 * sizeof(float));

        // Load XY
        uint32_t before = masm.size();
        loadSimd(type, 2, srcAddr, out);
        uint32_t after = masm.size();
        // We're noting a load of 3 elements, so that the bounds check checks
        // for 3 elements.
        masm.append(AsmJSHeapAccess(before, after, 3, type, maybeCmpOffset));

        // Load Z (W is zeroed)
        before = after;
        loadSimd(type, 1, shiftedOffset, ScratchSimdReg);
        after = masm.size();
        masm.append(AsmJSHeapAccess(before, after, 1, type));

        // Move ZW atop XY
        masm.vmovlhps(ScratchSimdReg, out, out);
        return;
    }

    uint32_t before = masm.size();
    loadSimd(type, numElems, srcAddr, out);
    uint32_t after = masm.size();
    masm.append(AsmJSHeapAccess(before, after, numElems, type, maybeCmpOffset));
}
コード例 #3
0
void
CodeGeneratorX64::visitAsmJSLoadHeap(LAsmJSLoadHeap *ins)
{
    MAsmJSLoadHeap *mir = ins->mir();
    Scalar::Type vt = mir->accessType();
    const LAllocation *ptr = ins->ptr();
    const LDefinition *out = ins->output();
    Operand srcAddr(HeapReg);

    if (Scalar::isSimdType(vt))
        return emitSimdLoad(ins);

    if (ptr->isConstant()) {
        int32_t ptrImm = ptr->toConstant()->toInt32();
        MOZ_ASSERT(ptrImm >= 0);
        srcAddr = Operand(HeapReg, ptrImm);
    } else {
        srcAddr = Operand(HeapReg, ToRegister(ptr), TimesOne);
    }

    memoryBarrier(ins->mir()->barrierBefore());
    OutOfLineLoadTypedArrayOutOfBounds *ool = nullptr;
    uint32_t maybeCmpOffset = AsmJSHeapAccess::NoLengthCheck;
    if (mir->needsBoundsCheck()) {
        CodeOffsetLabel cmp = masm.cmp32WithPatch(ToRegister(ptr), Imm32(0));
        ool = new(alloc()) OutOfLineLoadTypedArrayOutOfBounds(ToAnyRegister(out), vt);
        addOutOfLineCode(ool, ins->mir());
        masm.j(Assembler::AboveOrEqual, ool->entry());
        maybeCmpOffset = cmp.offset();
    }

    uint32_t before = masm.size();
    switch (vt) {
      case Scalar::Int8:      masm.movsbl(srcAddr, ToRegister(out)); break;
      case Scalar::Uint8:     masm.movzbl(srcAddr, ToRegister(out)); break;
      case Scalar::Int16:     masm.movswl(srcAddr, ToRegister(out)); break;
      case Scalar::Uint16:    masm.movzwl(srcAddr, ToRegister(out)); break;
      case Scalar::Int32:
      case Scalar::Uint32:    masm.movl(srcAddr, ToRegister(out)); break;
      case Scalar::Float32:   masm.loadFloat32(srcAddr, ToFloatRegister(out)); break;
      case Scalar::Float64:   masm.loadDouble(srcAddr, ToFloatRegister(out)); break;
      case Scalar::Float32x4:
      case Scalar::Int32x4:   MOZ_CRASH("SIMD loads should be handled in emitSimdLoad");
      case Scalar::Uint8Clamped:
      case Scalar::MaxTypedArrayViewType:
          MOZ_CRASH("unexpected array type");
    }
    uint32_t after = masm.size();
    verifyHeapAccessDisassembly(before, after, /*isLoad=*/true, vt, srcAddr, *out->output());
    if (ool)
        masm.bind(ool->rejoin());
    memoryBarrier(ins->mir()->barrierAfter());
    masm.append(AsmJSHeapAccess(before, after, vt, ToAnyRegister(out), maybeCmpOffset));
}
コード例 #4
0
bool
CodeGeneratorX64::visitAsmJSLoadHeap(LAsmJSLoadHeap *ins)
{
    MAsmJSLoadHeap *mir = ins->mir();
    AsmJSHeapAccess::ViewType vt = mir->viewType();
    const LAllocation *ptr = ins->ptr();
    const LDefinition *out = ins->output();
    Operand srcAddr(HeapReg);

    if (ptr->isConstant()) {
        int32_t ptrImm = ptr->toConstant()->toInt32();
        MOZ_ASSERT(ptrImm >= 0);
        srcAddr = Operand(HeapReg, ptrImm);
    } else {
        srcAddr = Operand(HeapReg, ToRegister(ptr), TimesOne);
    }

    memoryBarrier(ins->mir()->barrierBefore());
    OutOfLineLoadTypedArrayOutOfBounds *ool = nullptr;
    uint32_t maybeCmpOffset = AsmJSHeapAccess::NoLengthCheck;
    if (mir->needsBoundsCheck()) {
        ool = new(alloc()) OutOfLineLoadTypedArrayOutOfBounds(ToAnyRegister(out), vt);
        if (!addOutOfLineCode(ool, ins->mir()))
            return false;

        CodeOffsetLabel cmp = masm.cmplWithPatch(ToRegister(ptr), Imm32(0));
        masm.j(Assembler::AboveOrEqual, ool->entry());
        maybeCmpOffset = cmp.offset();
    }

    uint32_t before = masm.size();
    switch (vt) {
      case AsmJSHeapAccess::Int8:      masm.movsbl(srcAddr, ToRegister(out)); break;
      case AsmJSHeapAccess::Uint8:     masm.movzbl(srcAddr, ToRegister(out)); break;
      case AsmJSHeapAccess::Int16:     masm.movswl(srcAddr, ToRegister(out)); break;
      case AsmJSHeapAccess::Uint16:    masm.movzwl(srcAddr, ToRegister(out)); break;
      case AsmJSHeapAccess::Int32:
      case AsmJSHeapAccess::Uint32:    masm.movl(srcAddr, ToRegister(out)); break;
      case AsmJSHeapAccess::Float32:   masm.loadFloat32(srcAddr, ToFloatRegister(out)); break;
      case AsmJSHeapAccess::Float64:   masm.loadDouble(srcAddr, ToFloatRegister(out)); break;
      case AsmJSHeapAccess::Float32x4: masm.loadUnalignedFloat32x4(srcAddr, ToFloatRegister(out)); break;
      case AsmJSHeapAccess::Int32x4:   masm.loadUnalignedInt32x4(srcAddr, ToFloatRegister(out)); break;
      case AsmJSHeapAccess::Uint8Clamped: MOZ_CRASH("unexpected array type");
    }
    uint32_t after = masm.size();
    if (ool)
        masm.bind(ool->rejoin());
    memoryBarrier(ins->mir()->barrierAfter());
    masm.append(AsmJSHeapAccess(before, after, vt, ToAnyRegister(out), maybeCmpOffset));
    return true;
}
コード例 #5
0
bool
CodeGeneratorX64::visitAsmJSLoadHeap(LAsmJSLoadHeap *ins)
{
    MAsmJSLoadHeap *mir = ins->mir();
    ArrayBufferView::ViewType vt = mir->viewType();
    const LAllocation *ptr = ins->ptr();

    // No need to note the access if it will never fault.
    bool skipNote = mir->skipBoundsCheck();
    Operand srcAddr(HeapReg);

    if (ptr->isConstant()) {
        int32_t ptrImm = ptr->toConstant()->toInt32();
        // Note only a positive index is accepted here because a negative offset would
        // not wrap back into the protected area reserved for the heap.
        JS_ASSERT(ptrImm >= 0);
        srcAddr = Operand(HeapReg, ptrImm);
    } else {
        srcAddr = Operand(HeapReg, ToRegister(ptr), TimesOne);
    }

    if (vt == ArrayBufferView::TYPE_FLOAT32) {
        FloatRegister dest = ToFloatRegister(ins->output());
        uint32_t before = masm.size();
        masm.movss(srcAddr, dest);
        uint32_t after = masm.size();
        masm.cvtss2sd(dest, dest);
        return skipNote || gen->noteHeapAccess(AsmJSHeapAccess(before, after, vt, ToAnyRegister(ins->output())));
    }

    uint32_t before = masm.size();
    switch (vt) {
      case ArrayBufferView::TYPE_INT8:    masm.movsbl(srcAddr, ToRegister(ins->output())); break;
      case ArrayBufferView::TYPE_UINT8:   masm.movzbl(srcAddr, ToRegister(ins->output())); break;
      case ArrayBufferView::TYPE_INT16:   masm.movswl(srcAddr, ToRegister(ins->output())); break;
      case ArrayBufferView::TYPE_UINT16:  masm.movzwl(srcAddr, ToRegister(ins->output())); break;
      case ArrayBufferView::TYPE_INT32:
      case ArrayBufferView::TYPE_UINT32:  masm.movl(srcAddr, ToRegister(ins->output())); break;
      case ArrayBufferView::TYPE_FLOAT64: masm.movsd(srcAddr, ToFloatRegister(ins->output())); break;
      default: MOZ_ASSUME_UNREACHABLE("unexpected array type");
    }
    uint32_t after = masm.size();
    return skipNote || gen->noteHeapAccess(AsmJSHeapAccess(before, after, vt, ToAnyRegister(ins->output())));
}