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go/usr/austin/eval/value.go
Austin Clements 75760a4b5d Implement multi-valued functions, multi-valued return, and 
unpacking for assignments, call arguments, and returns.  This
change revamps the whole assignment compilation system to be
multi-valued, using the new MultiType type and multiV value.
Function calls, returns, and assignments now share a lot of
code and produce very consistent error messages.

R=rsc
APPROVED=rsc
DELTA=510  (335 added, 74 deleted, 101 changed)
OCL=32248
CL=32258
2009-07-27 17:32:35 -07:00

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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package eval
import (
"bignum";
"eval";
"fmt";
)
/*
* Bool
*/
type boolV bool
func (v *boolV) String() string {
return fmt.Sprint(*v);
}
func (v *boolV) Assign(o Value) {
*v = boolV(o.(BoolValue).Get());
}
func (v *boolV) Get() bool {
return bool(*v);
}
func (v *boolV) Set(x bool) {
*v = boolV(x);
}
func (t *boolType) Zero() Value {
res := boolV(false);
return &res;
}
/*
* Uint
*/
type uint8V uint8
func (v *uint8V) String() string {
return fmt.Sprint(*v);
}
func (v *uint8V) Assign(o Value) {
*v = uint8V(o.(UintValue).Get());
}
func (v *uint8V) Get() uint64 {
return uint64(*v);
}
func (v *uint8V) Set(x uint64) {
*v = uint8V(x);
}
type uint16V uint16
func (v *uint16V) String() string {
return fmt.Sprint(*v);
}
func (v *uint16V) Assign(o Value) {
*v = uint16V(o.(UintValue).Get());
}
func (v *uint16V) Get() uint64 {
return uint64(*v);
}
func (v *uint16V) Set(x uint64) {
*v = uint16V(x);
}
type uint32V uint32
func (v *uint32V) String() string {
return fmt.Sprint(*v);
}
func (v *uint32V) Assign(o Value) {
*v = uint32V(o.(UintValue).Get());
}
func (v *uint32V) Get() uint64 {
return uint64(*v);
}
func (v *uint32V) Set(x uint64) {
*v = uint32V(x);
}
type uint64V uint64
func (v *uint64V) String() string {
return fmt.Sprint(*v);
}
func (v *uint64V) Assign(o Value) {
*v = uint64V(o.(UintValue).Get());
}
func (v *uint64V) Get() uint64 {
return uint64(*v);
}
func (v *uint64V) Set(x uint64) {
*v = uint64V(x);
}
type uintV uint
func (v *uintV) String() string {
return fmt.Sprint(*v);
}
func (v *uintV) Assign(o Value) {
*v = uintV(o.(UintValue).Get());
}
func (v *uintV) Get() uint64 {
return uint64(*v);
}
func (v *uintV) Set(x uint64) {
*v = uintV(x);
}
type uintptrV uintptr
func (v *uintptrV) String() string {
return fmt.Sprint(*v);
}
func (v *uintptrV) Assign(o Value) {
*v = uintptrV(o.(UintValue).Get());
}
func (v *uintptrV) Get() uint64 {
return uint64(*v);
}
func (v *uintptrV) Set(x uint64) {
*v = uintptrV(x);
}
func (t *uintType) Zero() Value {
switch t.Bits {
case 0:
if t.Ptr {
res := uintptrV(0);
return &res;
} else {
res := uintV(0);
return &res;
}
case 8:
res := uint8V(0);
return &res;
case 16:
res := uint16V(0);
return &res;
case 32:
res := uint32V(0);
return &res;
case 64:
res := uint64V(0);
return &res;
}
panic("unexpected uint bit count: ", t.Bits);
}
/*
* Int
*/
type int8V int8
func (v *int8V) String() string {
return fmt.Sprint(*v);
}
func (v *int8V) Assign(o Value) {
*v = int8V(o.(IntValue).Get());
}
func (v *int8V) Get() int64 {
return int64(*v);
}
func (v *int8V) Set(x int64) {
*v = int8V(x);
}
type int16V int16
func (v *int16V) String() string {
return fmt.Sprint(*v);
}
func (v *int16V) Assign(o Value) {
*v = int16V(o.(IntValue).Get());
}
func (v *int16V) Get() int64 {
return int64(*v);
}
func (v *int16V) Set(x int64) {
*v = int16V(x);
}
type int32V int32
func (v *int32V) String() string {
return fmt.Sprint(*v);
}
func (v *int32V) Assign(o Value) {
*v = int32V(o.(IntValue).Get());
}
func (v *int32V) Get() int64 {
return int64(*v);
}
func (v *int32V) Set(x int64) {
*v = int32V(x);
}
type int64V int64
func (v *int64V) String() string {
return fmt.Sprint(*v);
}
func (v *int64V) Assign(o Value) {
*v = int64V(o.(IntValue).Get());
}
func (v *int64V) Get() int64 {
return int64(*v);
}
func (v *int64V) Set(x int64) {
*v = int64V(x);
}
type intV int
func (v *intV) String() string {
return fmt.Sprint(*v);
}
func (v *intV) Assign(o Value) {
*v = intV(o.(IntValue).Get());
}
func (v *intV) Get() int64 {
return int64(*v);
}
func (v *intV) Set(x int64) {
*v = intV(x);
}
func (t *intType) Zero() Value {
switch t.Bits {
case 8:
res := int8V(0);
return &res;
case 16:
res := int16V(0);
return &res;
case 32:
res := int32V(0);
return &res;
case 64:
res := int64V(0);
return &res;
case 0:
res := intV(0);
return &res;
}
panic("unexpected int bit count: ", t.Bits);
}
/*
* Ideal int
*/
type idealIntV struct {
V *bignum.Integer;
}
func (v *idealIntV) String() string {
return v.V.String();
}
func (v *idealIntV) Assign(o Value) {
v.V = o.(IdealIntValue).Get();
}
func (v *idealIntV) Get() *bignum.Integer {
return v.V;
}
func (t *idealIntType) Zero() Value {
return &idealIntV{bignum.Int(0)};
}
/*
* Float
*/
type float32V float32
func (v *float32V) String() string {
return fmt.Sprint(*v);
}
func (v *float32V) Assign(o Value) {
*v = float32V(o.(FloatValue).Get());
}
func (v *float32V) Get() float64 {
return float64(*v);
}
func (v *float32V) Set(x float64) {
*v = float32V(x);
}
type float64V float64
func (v *float64V) String() string {
return fmt.Sprint(*v);
}
func (v *float64V) Assign(o Value) {
*v = float64V(o.(FloatValue).Get());
}
func (v *float64V) Get() float64 {
return float64(*v);
}
func (v *float64V) Set(x float64) {
*v = float64V(x);
}
type floatV float
func (v *floatV) String() string {
return fmt.Sprint(*v);
}
func (v *floatV) Assign(o Value) {
*v = floatV(o.(FloatValue).Get());
}
func (v *floatV) Get() float64 {
return float64(*v);
}
func (v *floatV) Set(x float64) {
*v = floatV(x);
}
func (t *floatType) Zero() Value {
switch t.Bits {
case 32:
res := float32V(0);
return &res;
case 64:
res := float64V(0);
return &res;
case 0:
res := floatV(0);
return &res;
}
panic("unexpected float bit count: ", t.Bits);
}
/*
* Ideal float
*/
type idealFloatV struct {
V *bignum.Rational;
}
func (v *idealFloatV) String() string {
return ratToString(v.V);
}
func (v *idealFloatV) Assign(o Value) {
v.V = o.(IdealFloatValue).Get();
}
func (v *idealFloatV) Get() *bignum.Rational {
return v.V;
}
func (t *idealFloatType) Zero() Value {
return &idealFloatV{bignum.Rat(1, 0)};
}
/*
* String
*/
type stringV string
func (v *stringV) String() string {
return fmt.Sprint(*v);
}
func (v *stringV) Assign(o Value) {
*v = stringV(o.(StringValue).Get());
}
func (v *stringV) Get() string {
return string(*v);
}
func (v *stringV) Set(x string) {
*v = stringV(x);
}
func (t *stringType) Zero() Value {
res := stringV("");
return &res;
}
/*
* Array
*/
type arrayV []Value
func (v *arrayV) String() string {
return fmt.Sprint(*v);
}
func (v *arrayV) Assign(o Value) {
oa := o.(ArrayValue);
l := int64(len(*v));
for i := int64(0); i < l; i++ {
(*v)[i].Assign(oa.Elem(i));
}
}
func (v *arrayV) Get() ArrayValue {
return v;
}
func (v *arrayV) Elem(i int64) Value {
return (*v)[i];
}
func (t *ArrayType) Zero() Value {
res := arrayV(make([]Value, t.Len));
// TODO(austin) It's unfortunate that each element is
// separately heap allocated. We could add ZeroArray to
// everything, though that doesn't help with multidimensional
// arrays. Or we could do something unsafe. We'll have this
// same problem with structs.
for i := int64(0); i < t.Len; i++ {
res[i] = t.Elem.Zero();
}
return &res;
}
/*
* Pointer
*/
type ptrV struct {
// nil if the pointer is nil
target Value;
}
func (v *ptrV) String() string {
return "&" + v.target.String();
}
func (v *ptrV) Assign(o Value) {
v.target = o.(PtrValue).Get();
}
func (v *ptrV) Get() Value {
return v.target;
}
func (v *ptrV) Set(x Value) {
v.target = x;
}
func (t *PtrType) Zero() Value {
return &ptrV{nil};
}
/*
* Functions
*/
type funcV struct {
target Func;
}
func (v *funcV) String() string {
// TODO(austin) Rob wants to see the definition
return "func {...}";
}
func (v *funcV) Assign(o Value) {
v.target = o.(FuncValue).Get();
}
func (v *funcV) Get() Func {
return v.target;
}
func (v *funcV) Set(x Func) {
v.target = x;
}
func (t *FuncType) Zero() Value {
return &funcV{nil};
}
/*
* Multi-values
*/
type multiV []Value
func (v multiV) String() string {
res := "(";
for i, v := range v {
if i > 0 {
res += ", ";
}
res += v.String();
}
return res + ")";
}
func (v multiV) Assign(o Value) {
omv := o.(multiV);
for i := range v {
v[i].Assign(omv[i]);
}
}
func (t *MultiType) Zero() Value {
res := make([]Value, len(t.Elems));
for i := 0; i < len(t.Elems); i++ {
res[i] = t.Elems[i].Zero();
}
return multiV(res);
}
/*
* Universal constants
*/
// TODO(austin) Nothing complains if I accidentally define init with
// arguments. Is this intentional?
func init() {
s := universe;
true := boolV(true);
s.DefineConst("true", BoolType, &true);
false := boolV(false);
s.DefineConst("false", BoolType, &false);
}
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