func visitIndex(instr *ssa.Index, infer *TypeInfer, ctx *Context) {
elem, array, index := instr, instr.X, instr.Index
// Array.
if aType, ok := array.Type().Underlying().(*types.Array); ok {
aInst, ok := ctx.F.locals[array]
if !ok {
aInst, ok = ctx.F.Prog.globals[array]
if !ok {
infer.Logger.Fatalf("index: %s: array %+v", ErrUnknownValue, array)
return
}
}
elems, ok := ctx.F.arrays[aInst]
if !ok {
elems, ok = ctx.F.Prog.arrays[aInst]
if !ok {
infer.Logger.Fatalf("index: %s: not an array %+v", ErrUnknownValue, aInst)
return
}
}
infer.Logger.Print(ctx.F.Sprintf(ValSymbol+"%s = %s"+FieldSymbol+"[%s] of type %s", instr.Name(), aInst, index, aType.String()))
if elems[index] != nil {
infer.Logger.Print(ctx.F.Sprintf(SubSymbol+"accessed as %s", elems[index]))
} else {
elems[index] = &Value{elem, ctx.F.InstanceID(), ctx.L.Index}
infer.Logger.Printf(ctx.F.Sprintf(SubSymbol+"elem uninitialised, set to %s", elem.Name()))
}
initNestedRefVar(infer, ctx, elems[index], false)
ctx.F.locals[elem] = elems[index]
return
}
}
func visitIndex(inst *ssa.Index, fr *frame) {
elem := inst
array := inst.X
index := inst.Index
_, isArray := array.Type().Underlying().(*types.Array)
_, isSlice := array.Type().Underlying().(*types.Slice)
if isArray || isSlice {
switch vd, kind := fr.get(array); kind {
case Array:
fmt.Fprintf(os.Stderr, " %s = %s(=%s)[%d] of type %s\n", cyan(reg(elem)), array.Name(), vd.String(), index, elem.Type().String())
if fr.env.arrays[vd][index] == nil { // First use
vdelem := utils.NewDef(elem)
fr.env.arrays[vd][index] = vdelem
fmt.Fprintf(os.Stderr, " ^ accessed for the first time: use %s as elem definition\n", elem.Name())
} else if fr.env.arrays[vd][index].Var != elem { // Previously defined
fmt.Fprintf(os.Stderr, " ^ elem %s previously defined as %s\n", elem.Name(), reg(fr.env.arrays[vd][index].Var))
} // else Accessed before (and unchanged)
fr.locals[elem] = fr.env.arrays[vd][index]
case LocalArray:
fmt.Fprintf(os.Stderr, " %s = %s(=%s)[%d] (local) of type %s\n", cyan(reg(elem)), array.Name(), vd.String(), index, elem.Type().String())
if fr.arrays[vd][index] == nil { // First use
vdElem := utils.NewDef(elem)
fr.arrays[vd][index] = vdElem
fmt.Fprintf(os.Stderr, " ^ accessed for the first time: use %s as elem definition\n", elem.Name())
} else if fr.arrays[vd][index].Var != elem { // Previously defined
fmt.Fprintf(os.Stderr, " ^ elem %s previously defined as %s\n", elem.Name(), reg(fr.arrays[vd][index].Var))
} // else Accessed before (and unchanged)
fr.locals[elem] = fr.arrays[vd][index]
case Nothing, Untracked:
// Nothing: Very likely external struct.
// Untracked: likely branches of return values (e.g. returning nil)
fmt.Fprintf(os.Stderr, " %s = %s(=%s)[%d] (external) of type %s\n", cyan(reg(elem)), inst.X.Name(), vd.String(), index, elem.Type().String())
vd := utils.NewDef(array) // New external array
fr.locals[array] = vd
fr.env.arrays[vd] = make(Elems)
vdElem := utils.NewDef(elem) // New external elem
fr.env.arrays[vd][index] = vdElem
fr.locals[elem] = vdElem
fmt.Fprintf(os.Stderr, " ^ accessed for the first time: use %s as elem definition of type %s\n", elem.Name(), inst.Type().(*types.Pointer).Elem().Underlying().String())
default:
panic(fmt.Sprintf("Index: Cannot access non-array %s", reg(array)))
}
} else {
panic(fmt.Sprintf("Index: Cannot access element - %s not an array", reg(array)))
}
}
