예제 #1
0
파일: x86.go 프로젝트: tsavola/wag
// OpCallIndirect using table index located in result register.
func (mach X86) OpCallIndirect(code gen.Coder, tableLen, sigIndex int32) int32 {
	var outOfBounds links.L
	var checksOut links.L

	mach.opCompareBounds(code, regResult, tableLen)
	Jle.rel8.opStub(code) // TODO: is this the correct comparison?
	outOfBounds.AddSite(code.Len())

	Mov.opFromAddr(code, types.I64, regResult, 3, regResult, code.RODataAddr()+gen.ROTableAddr)
	Mov.opFromReg(code, types.I32, regScratch, regResult) // zero-extended function address
	ShrImm.op(code, types.I64, regResult, 32)             // signature index
	Cmp.opImm(code, types.I32, regResult, sigIndex)
	Je.rel8.opStub(code)
	checksOut.AddSite(code.Len())

	code.OpTrapCall(traps.IndirectCallSignature)

	outOfBounds.Addr = code.Len()
	mach.updateBranches8(code, &outOfBounds)

	code.OpTrapCall(traps.IndirectCallIndex)

	checksOut.Addr = code.Len()
	mach.updateBranches8(code, &checksOut)

	Add.opFromReg(code, types.I64, regScratch, regTextBase)
	Call.opReg(code, regScratch)
	return code.Len()
}
예제 #2
0
파일: x86.go 프로젝트: tsavola/wag
// OpLoadROIntIndex32ScaleDisp must not allocate registers.
func (mach X86) OpLoadROIntIndex32ScaleDisp(code gen.Coder, t types.T, reg regs.R, regZeroExt bool, scale uint8, addr int32) (resultZeroExt bool) {
	if !regZeroExt {
		Mov.opFromReg(code, types.I32, reg, reg)
	}

	Mov.opFromAddr(code, t, reg, scale, reg, code.RODataAddr()+addr)
	resultZeroExt = true
	return
}