Exemplo n.º 1
0
func (f *Function) AllocInstr(instr *ssa.Alloc) (string, *Error) {
	asm := ""
	if instr == nil {
		return ErrorMsg("AllocInstr: nil instr")

	}
	if instr.Heap {
		msg := "Heap allocations are unsupported (are all print and log statements removed?), ssa variable: %v, type: %v"
		msgstr := fmt.Sprintf(msg, instr.Name(), instr.Type())
		return ErrorMsg(msgstr)
	}

	//Alloc values are always addresses, and have pointer types, so the type
	//of the allocated variable is actually
	//Type().Underlying().(*types.Pointer).Elem().
	info := f.identifiers[instr.Name()]
	if info.local == nil {
		ice(fmt.Sprintf("expected %v to be a local variable", instr.Name()))
	}
	if _, ok := info.typ.(*types.Pointer); ok {
	} else {
	}
	f.identifiers[instr.Name()] = info
	return asm, nil
}
Exemplo n.º 2
0
// visitAlloc is for variable allocation (usually by 'new')
// Everything allocated here are pointers
func visitAlloc(inst *ssa.Alloc, fr *frame) {
	locn := loc(fr, inst.Pos())
	allocType := inst.Type().(*types.Pointer).Elem()
	if allocType == nil {
		panic("Alloc: Cannot Alloc for non-pointer type")
	}
	var val ssa.Value = inst

	switch t := allocType.Underlying().(type) {
	case *types.Array:
		vd := utils.NewDef(val)
		fr.locals[val] = vd
		if inst.Heap {
			fr.env.arrays[vd] = make(Elems)
			fmt.Fprintf(os.Stderr, "   %s = Alloc (array@heap) of type %s (%d elems) at %s\n", cyan(reg(inst)), inst.Type().String(), t.Len(), locn)
		} else {
			fr.arrays[vd] = make(Elems)
			fmt.Fprintf(os.Stderr, "   %s = Alloc (array@local) of type %s (%d elems) at %s\n", cyan(reg(inst)), inst.Type().String(), t.Len(), locn)
		}

	case *types.Chan:
		// VD will be created in MakeChan so no need to allocate here.
		fmt.Fprintf(os.Stderr, "   %s = Alloc (chan) of type %s at %s\n", cyan(reg(inst)), inst.Type().String(), locn)

	case *types.Struct:
		vd := utils.NewDef(val)
		fr.locals[val] = vd
		if inst.Heap {
			fr.env.structs[vd] = make(Fields, t.NumFields())
			fmt.Fprintf(os.Stderr, "   %s = Alloc (struct@heap) of type %s (%d fields) at %s\n", cyan(reg(inst)), inst.Type().String(), t.NumFields(), locn)
		} else {
			fr.structs[vd] = make(Fields, t.NumFields())
			fmt.Fprintf(os.Stderr, "   %s = Alloc (struct@local) of type %s (%d fields) at %s\n", cyan(reg(inst)), inst.Type().String(), t.NumFields(), locn)
		}

	default:
		fmt.Fprintf(os.Stderr, "   # %s = "+red("Alloc %s")+" of type %s\n", inst.Name(), inst.String(), t.String())
	}
}