| // 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 ( |
| "big" |
| "fmt" |
| ) |
| |
| type Value interface { |
| String() string |
| // Assign copies another value into this one. It should |
| // assume that the other value satisfies the same specific |
| // value interface (BoolValue, etc.), but must not assume |
| // anything about its specific type. |
| Assign(t *Thread, o Value) |
| } |
| |
| type BoolValue interface { |
| Value |
| Get(*Thread) bool |
| Set(*Thread, bool) |
| } |
| |
| type UintValue interface { |
| Value |
| Get(*Thread) uint64 |
| Set(*Thread, uint64) |
| } |
| |
| type IntValue interface { |
| Value |
| Get(*Thread) int64 |
| Set(*Thread, int64) |
| } |
| |
| // TODO(austin) IdealIntValue and IdealFloatValue should not exist |
| // because ideals are not l-values. |
| type IdealIntValue interface { |
| Value |
| Get() *big.Int |
| } |
| |
| type FloatValue interface { |
| Value |
| Get(*Thread) float64 |
| Set(*Thread, float64) |
| } |
| |
| type IdealFloatValue interface { |
| Value |
| Get() *big.Rat |
| } |
| |
| type StringValue interface { |
| Value |
| Get(*Thread) string |
| Set(*Thread, string) |
| } |
| |
| type ArrayValue interface { |
| Value |
| // TODO(austin) Get() is here for uniformity, but is |
| // completely useless. If a lot of other types have similarly |
| // useless Get methods, just special-case these uses. |
| Get(*Thread) ArrayValue |
| Elem(*Thread, int64) Value |
| // Sub returns an ArrayValue backed by the same array that |
| // starts from element i and has length len. |
| Sub(i int64, len int64) ArrayValue |
| } |
| |
| type StructValue interface { |
| Value |
| // TODO(austin) This is another useless Get() |
| Get(*Thread) StructValue |
| Field(*Thread, int) Value |
| } |
| |
| type PtrValue interface { |
| Value |
| Get(*Thread) Value |
| Set(*Thread, Value) |
| } |
| |
| type Func interface { |
| NewFrame() *Frame |
| Call(*Thread) |
| } |
| |
| type FuncValue interface { |
| Value |
| Get(*Thread) Func |
| Set(*Thread, Func) |
| } |
| |
| type Interface struct { |
| Type Type |
| Value Value |
| } |
| |
| type InterfaceValue interface { |
| Value |
| Get(*Thread) Interface |
| Set(*Thread, Interface) |
| } |
| |
| type Slice struct { |
| Base ArrayValue |
| Len, Cap int64 |
| } |
| |
| type SliceValue interface { |
| Value |
| Get(*Thread) Slice |
| Set(*Thread, Slice) |
| } |
| |
| type Map interface { |
| Len(*Thread) int64 |
| // Retrieve an element from the map, returning nil if it does |
| // not exist. |
| Elem(t *Thread, key interface{}) Value |
| // Set an entry in the map. If val is nil, delete the entry. |
| SetElem(t *Thread, key interface{}, val Value) |
| // TODO(austin) Perhaps there should be an iterator interface instead. |
| Iter(func(key interface{}, val Value) bool) |
| } |
| |
| type MapValue interface { |
| Value |
| Get(*Thread) Map |
| Set(*Thread, Map) |
| } |
| |
| /* |
| * Bool |
| */ |
| |
| type boolV bool |
| |
| func (v *boolV) String() string { return fmt.Sprint(*v) } |
| |
| func (v *boolV) Assign(t *Thread, o Value) { *v = boolV(o.(BoolValue).Get(t)) } |
| |
| func (v *boolV) Get(*Thread) bool { return bool(*v) } |
| |
| func (v *boolV) Set(t *Thread, x bool) { *v = boolV(x) } |
| |
| /* |
| * Uint |
| */ |
| |
| type uint8V uint8 |
| |
| func (v *uint8V) String() string { return fmt.Sprint(*v) } |
| |
| func (v *uint8V) Assign(t *Thread, o Value) { *v = uint8V(o.(UintValue).Get(t)) } |
| |
| func (v *uint8V) Get(*Thread) uint64 { return uint64(*v) } |
| |
| func (v *uint8V) Set(t *Thread, x uint64) { *v = uint8V(x) } |
| |
| type uint16V uint16 |
| |
| func (v *uint16V) String() string { return fmt.Sprint(*v) } |
| |
| func (v *uint16V) Assign(t *Thread, o Value) { *v = uint16V(o.(UintValue).Get(t)) } |
| |
| func (v *uint16V) Get(*Thread) uint64 { return uint64(*v) } |
| |
| func (v *uint16V) Set(t *Thread, x uint64) { *v = uint16V(x) } |
| |
| type uint32V uint32 |
| |
| func (v *uint32V) String() string { return fmt.Sprint(*v) } |
| |
| func (v *uint32V) Assign(t *Thread, o Value) { *v = uint32V(o.(UintValue).Get(t)) } |
| |
| func (v *uint32V) Get(*Thread) uint64 { return uint64(*v) } |
| |
| func (v *uint32V) Set(t *Thread, x uint64) { *v = uint32V(x) } |
| |
| type uint64V uint64 |
| |
| func (v *uint64V) String() string { return fmt.Sprint(*v) } |
| |
| func (v *uint64V) Assign(t *Thread, o Value) { *v = uint64V(o.(UintValue).Get(t)) } |
| |
| func (v *uint64V) Get(*Thread) uint64 { return uint64(*v) } |
| |
| func (v *uint64V) Set(t *Thread, x uint64) { *v = uint64V(x) } |
| |
| type uintV uint |
| |
| func (v *uintV) String() string { return fmt.Sprint(*v) } |
| |
| func (v *uintV) Assign(t *Thread, o Value) { *v = uintV(o.(UintValue).Get(t)) } |
| |
| func (v *uintV) Get(*Thread) uint64 { return uint64(*v) } |
| |
| func (v *uintV) Set(t *Thread, x uint64) { *v = uintV(x) } |
| |
| type uintptrV uintptr |
| |
| func (v *uintptrV) String() string { return fmt.Sprint(*v) } |
| |
| func (v *uintptrV) Assign(t *Thread, o Value) { *v = uintptrV(o.(UintValue).Get(t)) } |
| |
| func (v *uintptrV) Get(*Thread) uint64 { return uint64(*v) } |
| |
| func (v *uintptrV) Set(t *Thread, x uint64) { *v = uintptrV(x) } |
| |
| /* |
| * Int |
| */ |
| |
| type int8V int8 |
| |
| func (v *int8V) String() string { return fmt.Sprint(*v) } |
| |
| func (v *int8V) Assign(t *Thread, o Value) { *v = int8V(o.(IntValue).Get(t)) } |
| |
| func (v *int8V) Get(*Thread) int64 { return int64(*v) } |
| |
| func (v *int8V) Set(t *Thread, x int64) { *v = int8V(x) } |
| |
| type int16V int16 |
| |
| func (v *int16V) String() string { return fmt.Sprint(*v) } |
| |
| func (v *int16V) Assign(t *Thread, o Value) { *v = int16V(o.(IntValue).Get(t)) } |
| |
| func (v *int16V) Get(*Thread) int64 { return int64(*v) } |
| |
| func (v *int16V) Set(t *Thread, x int64) { *v = int16V(x) } |
| |
| type int32V int32 |
| |
| func (v *int32V) String() string { return fmt.Sprint(*v) } |
| |
| func (v *int32V) Assign(t *Thread, o Value) { *v = int32V(o.(IntValue).Get(t)) } |
| |
| func (v *int32V) Get(*Thread) int64 { return int64(*v) } |
| |
| func (v *int32V) Set(t *Thread, x int64) { *v = int32V(x) } |
| |
| type int64V int64 |
| |
| func (v *int64V) String() string { return fmt.Sprint(*v) } |
| |
| func (v *int64V) Assign(t *Thread, o Value) { *v = int64V(o.(IntValue).Get(t)) } |
| |
| func (v *int64V) Get(*Thread) int64 { return int64(*v) } |
| |
| func (v *int64V) Set(t *Thread, x int64) { *v = int64V(x) } |
| |
| type intV int |
| |
| func (v *intV) String() string { return fmt.Sprint(*v) } |
| |
| func (v *intV) Assign(t *Thread, o Value) { *v = intV(o.(IntValue).Get(t)) } |
| |
| func (v *intV) Get(*Thread) int64 { return int64(*v) } |
| |
| func (v *intV) Set(t *Thread, x int64) { *v = intV(x) } |
| |
| /* |
| * Ideal int |
| */ |
| |
| type idealIntV struct { |
| V *big.Int |
| } |
| |
| func (v *idealIntV) String() string { return v.V.String() } |
| |
| func (v *idealIntV) Assign(t *Thread, o Value) { |
| v.V = o.(IdealIntValue).Get() |
| } |
| |
| func (v *idealIntV) Get() *big.Int { return v.V } |
| |
| /* |
| * Float |
| */ |
| |
| type float32V float32 |
| |
| func (v *float32V) String() string { return fmt.Sprint(*v) } |
| |
| func (v *float32V) Assign(t *Thread, o Value) { *v = float32V(o.(FloatValue).Get(t)) } |
| |
| func (v *float32V) Get(*Thread) float64 { return float64(*v) } |
| |
| func (v *float32V) Set(t *Thread, x float64) { *v = float32V(x) } |
| |
| type float64V float64 |
| |
| func (v *float64V) String() string { return fmt.Sprint(*v) } |
| |
| func (v *float64V) Assign(t *Thread, o Value) { *v = float64V(o.(FloatValue).Get(t)) } |
| |
| func (v *float64V) Get(*Thread) float64 { return float64(*v) } |
| |
| func (v *float64V) Set(t *Thread, x float64) { *v = float64V(x) } |
| |
| /* |
| * Ideal float |
| */ |
| |
| type idealFloatV struct { |
| V *big.Rat |
| } |
| |
| func (v *idealFloatV) String() string { return v.V.FloatString(6) } |
| |
| func (v *idealFloatV) Assign(t *Thread, o Value) { |
| v.V = o.(IdealFloatValue).Get() |
| } |
| |
| func (v *idealFloatV) Get() *big.Rat { return v.V } |
| |
| /* |
| * String |
| */ |
| |
| type stringV string |
| |
| func (v *stringV) String() string { return fmt.Sprint(*v) } |
| |
| func (v *stringV) Assign(t *Thread, o Value) { *v = stringV(o.(StringValue).Get(t)) } |
| |
| func (v *stringV) Get(*Thread) string { return string(*v) } |
| |
| func (v *stringV) Set(t *Thread, x string) { *v = stringV(x) } |
| |
| /* |
| * Array |
| */ |
| |
| type arrayV []Value |
| |
| func (v *arrayV) String() string { |
| res := "{" |
| for i, e := range *v { |
| if i > 0 { |
| res += ", " |
| } |
| res += e.String() |
| } |
| return res + "}" |
| } |
| |
| func (v *arrayV) Assign(t *Thread, o Value) { |
| oa := o.(ArrayValue) |
| l := int64(len(*v)) |
| for i := int64(0); i < l; i++ { |
| (*v)[i].Assign(t, oa.Elem(t, i)) |
| } |
| } |
| |
| func (v *arrayV) Get(*Thread) ArrayValue { return v } |
| |
| func (v *arrayV) Elem(t *Thread, i int64) Value { |
| return (*v)[i] |
| } |
| |
| func (v *arrayV) Sub(i int64, len int64) ArrayValue { |
| res := (*v)[i : i+len] |
| return &res |
| } |
| |
| /* |
| * Struct |
| */ |
| |
| type structV []Value |
| |
| // TODO(austin) Should these methods (and arrayV's) be on structV |
| // instead of *structV? |
| func (v *structV) String() string { |
| res := "{" |
| for i, v := range *v { |
| if i > 0 { |
| res += ", " |
| } |
| res += v.String() |
| } |
| return res + "}" |
| } |
| |
| func (v *structV) Assign(t *Thread, o Value) { |
| oa := o.(StructValue) |
| l := len(*v) |
| for i := 0; i < l; i++ { |
| (*v)[i].Assign(t, oa.Field(t, i)) |
| } |
| } |
| |
| func (v *structV) Get(*Thread) StructValue { return v } |
| |
| func (v *structV) Field(t *Thread, i int) Value { |
| return (*v)[i] |
| } |
| |
| /* |
| * Pointer |
| */ |
| |
| type ptrV struct { |
| // nil if the pointer is nil |
| target Value |
| } |
| |
| func (v *ptrV) String() string { |
| if v.target == nil { |
| return "<nil>" |
| } |
| return "&" + v.target.String() |
| } |
| |
| func (v *ptrV) Assign(t *Thread, o Value) { v.target = o.(PtrValue).Get(t) } |
| |
| func (v *ptrV) Get(*Thread) Value { return v.target } |
| |
| func (v *ptrV) Set(t *Thread, x Value) { v.target = x } |
| |
| /* |
| * 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(t *Thread, o Value) { v.target = o.(FuncValue).Get(t) } |
| |
| func (v *funcV) Get(*Thread) Func { return v.target } |
| |
| func (v *funcV) Set(t *Thread, x Func) { v.target = x } |
| |
| /* |
| * Interfaces |
| */ |
| |
| type interfaceV struct { |
| Interface |
| } |
| |
| func (v *interfaceV) String() string { |
| if v.Type == nil || v.Value == nil { |
| return "<nil>" |
| } |
| return v.Value.String() |
| } |
| |
| func (v *interfaceV) Assign(t *Thread, o Value) { |
| v.Interface = o.(InterfaceValue).Get(t) |
| } |
| |
| func (v *interfaceV) Get(*Thread) Interface { return v.Interface } |
| |
| func (v *interfaceV) Set(t *Thread, x Interface) { |
| v.Interface = x |
| } |
| |
| /* |
| * Slices |
| */ |
| |
| type sliceV struct { |
| Slice |
| } |
| |
| func (v *sliceV) String() string { |
| if v.Base == nil { |
| return "<nil>" |
| } |
| return v.Base.Sub(0, v.Len).String() |
| } |
| |
| func (v *sliceV) Assign(t *Thread, o Value) { v.Slice = o.(SliceValue).Get(t) } |
| |
| func (v *sliceV) Get(*Thread) Slice { return v.Slice } |
| |
| func (v *sliceV) Set(t *Thread, x Slice) { v.Slice = x } |
| |
| /* |
| * Maps |
| */ |
| |
| type mapV struct { |
| target Map |
| } |
| |
| func (v *mapV) String() string { |
| if v.target == nil { |
| return "<nil>" |
| } |
| res := "map[" |
| i := 0 |
| v.target.Iter(func(key interface{}, val Value) bool { |
| if i > 0 { |
| res += ", " |
| } |
| i++ |
| res += fmt.Sprint(key) + ":" + val.String() |
| return true |
| }) |
| return res + "]" |
| } |
| |
| func (v *mapV) Assign(t *Thread, o Value) { v.target = o.(MapValue).Get(t) } |
| |
| func (v *mapV) Get(*Thread) Map { return v.target } |
| |
| func (v *mapV) Set(t *Thread, x Map) { v.target = x } |
| |
| type evalMap map[interface{}]Value |
| |
| func (m evalMap) Len(t *Thread) int64 { return int64(len(m)) } |
| |
| func (m evalMap) Elem(t *Thread, key interface{}) Value { |
| return m[key] |
| } |
| |
| func (m evalMap) SetElem(t *Thread, key interface{}, val Value) { |
| if val == nil { |
| m[key] = nil, false |
| } else { |
| m[key] = val |
| } |
| } |
| |
| func (m evalMap) Iter(cb func(key interface{}, val Value) bool) { |
| for k, v := range m { |
| if !cb(k, v) { |
| break |
| } |
| } |
| } |
| |
| /* |
| * 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(t *Thread, o Value) { |
| omv := o.(multiV) |
| for i := range v { |
| v[i].Assign(t, omv[i]) |
| } |
| } |
| |
| /* |
| * Universal constants |
| */ |
| |
| func init() { |
| s := universe |
| |
| true := boolV(true) |
| s.DefineConst("true", universePos, BoolType, &true) |
| false := boolV(false) |
| s.DefineConst("false", universePos, BoolType, &false) |
| } |
