// 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()
}
func (mach X86) OpTrapIfStackExhausted(code gen.Coder) (stackCheckAddr int32) {
var checked links.L
Lea.opFromStack(code, types.I64, regScratch, -0x80000000) // reserve 32-bit displacement
stackCheckAddr = code.Len()
Cmp.opFromReg(code, types.I64, regScratch, regStackLimit)
Jge.rel8.opStub(code)
checked.AddSite(code.Len())
code.OpTrapCall(traps.CallStackExhausted)
checked.Addr = code.Len()
mach.updateBranches8(code, &checked)
return
}