func wrapMain(funcs []*PkgSym) *Func {
ret := NewFunc() // the main func
// clear r0 for safety
ret.AddInst(inst.Reg(arch8.XOR, 0, 0, 0, 0, 0))
for _, f := range funcs {
ret.AddInst(inst.Jmp(arch8.JAL, 0))
ret.AddLink(FillLink, f)
}
ret.AddInst(inst.Sys(arch8.HALT, 0))
return ret
}
func resolveInstJmp(p lex8.Logger, ops []*lex8.Token) (*inst, bool) {
op0 := ops[0]
opName := op0.Lit
var op uint32
// op sym
switch opName {
case "j":
op = arch8.J
case "jal":
op = arch8.JAL
default:
return nil, false
}
var pack, sym string
var fill int
var symTok *lex8.Token
if argCount(p, ops, 1) {
symTok = ops[1]
if checkLabel(p, ops[1]) {
sym = ops[1].Lit
fill = fillLabel
} else {
pack, sym = parseSym(p, ops[1])
fill = fillLink
}
}
ret := new(inst)
ret.inst = asminst.Jmp(op, 0)
ret.pkg = pack
ret.sym = sym
ret.fill = fill
ret.symTok = symTok
return ret, true
}
func (_s) j(im int32) uint32 { return S.Jmp(A.J, im) }
func (_s) jal(im int32) uint32 { return S.Jmp(A.JAL, im) }