reflect: add support for non-named basic types
Этот коммит содержится в:
Ayke van Laethem
родитель
222c4c75b1
коммит
fb23e9c212
7 изменённых файлов: 397 добавлений и 26 удалений
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@ -104,15 +104,6 @@ func (t *typeInfo) getMethod(signature *signatureInfo) *methodInfo {
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panic("could not find method")
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}
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// id returns the fully-qualified type name including import path, removing the
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// $type suffix.
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func (t *typeInfo) id() string {
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if !strings.HasSuffix(t.name, "$type") {
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panic("concrete type does not have $type suffix: " + t.name)
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}
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return t.name[:len(t.name)-len("$type")]
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}
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// typeInfoSlice implements sort.Slice, sorting the most commonly used types
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// first.
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type typeInfoSlice []*typeInfo
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@ -423,9 +414,7 @@ func (p *lowerInterfacesPass) run() {
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}
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// Assign a type code for each type.
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for i, t := range typeSlice {
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t.num = uint64(i + 1)
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}
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p.assignTypeCodes(typeSlice)
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// Replace each call to runtime.makeInterface with the constant type code.
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for _, use := range makeInterfaceUses {
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@ -691,7 +680,7 @@ func (p *lowerInterfacesPass) createInterfaceMethodFunc(itf *interfaceInfo, sign
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// Define all possible functions that can be called.
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for _, typ := range itf.types {
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bb := llvm.AddBasicBlock(fn, typ.id())
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bb := llvm.AddBasicBlock(fn, typ.name)
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sw.AddCase(llvm.ConstInt(p.uintptrType, typ.num, false), bb)
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// The function we will redirect to when the interface has this type.
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@ -79,9 +79,58 @@ func (c *Compiler) parseMakeInterface(val llvm.Value, typ types.Type, global str
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// It returns a pointer to an external global which should be replaced with the
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// real type in the interface lowering pass.
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func (c *Compiler) getTypeCode(typ types.Type) llvm.Value {
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global := c.mod.NamedGlobal(typ.String() + "$type")
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var globalName string
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switch typ := typ.(type) {
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case *types.Basic:
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var name string
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switch typ.Kind() {
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case types.Bool:
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name = "bool"
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case types.Int:
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name = "int"
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case types.Int8:
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name = "int8"
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case types.Int16:
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name = "int16"
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case types.Int32:
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name = "int32"
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case types.Int64:
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name = "int64"
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case types.Uint:
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name = "uint"
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case types.Uint8:
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name = "uint8"
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case types.Uint16:
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name = "uint16"
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case types.Uint32:
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name = "uint32"
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case types.Uint64:
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name = "uint64"
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case types.Uintptr:
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name = "uintptr"
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case types.Float32:
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name = "float32"
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case types.Float64:
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name = "float64"
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case types.Complex64:
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name = "complex64"
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case types.Complex128:
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name = "complex128"
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case types.String:
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name = "string"
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case types.UnsafePointer:
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name = "unsafeptr"
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default:
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panic("unknown basic type: " + typ.Name())
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}
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globalName = "type:basic:" + name
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default:
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// Unknown type, fall back to the .String() method for identification.
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globalName = "type:other:" + typ.String()
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}
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global := c.mod.NamedGlobal(globalName)
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if global.IsNil() {
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global = llvm.AddGlobal(c.mod, c.ctx.Int8Type(), typ.String()+"$type")
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global = llvm.AddGlobal(c.mod, c.ctx.Int8Type(), globalName)
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global.SetGlobalConstant(true)
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}
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return global
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55
compiler/reflect.go
Обычный файл
55
compiler/reflect.go
Обычный файл
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@ -0,0 +1,55 @@
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package compiler
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import (
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"strings"
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)
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var basicTypes = map[string]uint64{
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"bool": 1,
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"int": 2,
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"int8": 3,
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"int16": 4,
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"int32": 5,
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"int64": 6,
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"uint": 7,
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"uint8": 8,
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"uint16": 9,
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"uint32": 10,
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"uint64": 11,
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"uintptr": 12,
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"float32": 13,
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"float64": 14,
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"complex64": 15,
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"complex128": 16,
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"string": 17,
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"unsafeptr": 18,
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}
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func (c *Compiler) assignTypeCodes(typeSlice typeInfoSlice) {
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fn := c.mod.NamedFunction("reflect.ValueOf")
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if fn.IsNil() {
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// reflect.ValueOf is never used, so we can use the most efficient
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// encoding possible.
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for i, t := range typeSlice {
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t.num = uint64(i + 1)
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}
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return
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}
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// Assign typecodes the way the reflect package expects.
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fallbackIndex := 1
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for _, t := range typeSlice {
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if strings.HasPrefix(t.name, "type:basic:") {
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// Basic types have a typecode with the lowest bit set to 0.
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num, ok := basicTypes[t.name[len("type:basic:"):]]
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if !ok {
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panic("invalid basic type: " + t.name)
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}
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t.num = num<<1 | 0
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} else {
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// Fallback types have a typecode with the lowest bit set to 1.
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t.num = uint64(fallbackIndex<<1 | 1)
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fallbackIndex++
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}
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}
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}
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@ -26,6 +26,8 @@ const (
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Float64
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Complex64
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Complex128
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String
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UnsafePointer
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Array
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Chan
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Func
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@ -33,11 +35,52 @@ const (
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Map
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Ptr
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Slice
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String
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Struct
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UnsafePointer
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)
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func (k Kind) String() string {
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switch k {
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case Bool:
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return "bool"
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case Int:
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return "int"
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case Int8:
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return "int8"
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case Int16:
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return "int16"
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case Int32:
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return "int32"
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case Int64:
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return "int64"
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case Uint:
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return "uint"
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case Uint8:
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return "uint8"
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case Uint16:
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return "uint16"
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case Uint32:
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return "uint32"
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case Uint64:
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return "uint64"
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case Uintptr:
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return "uintptr"
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case Float32:
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return "float32"
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case Float64:
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return "float64"
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case Complex64:
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return "complex64"
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case Complex128:
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return "complex128"
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case String:
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return "string"
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case UnsafePointer:
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return "unsafe.Pointer"
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default:
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return "T"
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}
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}
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// The typecode as used in an interface{}.
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type Type uintptr
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@ -50,8 +93,13 @@ func (t Type) String() string {
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}
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func (t Type) Kind() Kind {
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if t & 1 == 0 {
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// Basic type
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return Kind(t >> 1)
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} else {
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return Invalid // TODO
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}
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}
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func (t Type) Elem() Type {
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panic("unimplemented: (reflect.Type).Elem()")
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@ -33,7 +33,14 @@ func (v Value) IsNil() bool {
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}
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func (v Value) Pointer() uintptr {
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switch v.Type().Kind() {
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case UnsafePointer:
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return uintptr(v.value)
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case Chan, Func, Map, Ptr, Slice:
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panic("unimplemented: (reflect.Value).Pointer()")
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default:
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panic(&ValueError{"Pointer"})
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}
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}
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func (v Value) IsValid() bool {
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@ -57,27 +64,132 @@ func (v Value) CanSet() bool {
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}
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func (v Value) Bool() bool {
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panic("unimplemented: (reflect.Value).Bool()")
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switch v.Type().Kind() {
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case Bool:
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return uintptr(v.value) != 0
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default:
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panic(&ValueError{"Bool"})
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}
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}
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func (v Value) Int() int64 {
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panic("unimplemented: (reflect.Value).Int()")
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switch v.Type().Kind() {
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case Int:
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if unsafe.Sizeof(int(0)) <= unsafe.Sizeof(uintptr(0)) {
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return int64(int(uintptr(v.value)))
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} else {
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return int64(*(*int)(v.value))
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}
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case Int8:
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return int64(int8(uintptr(v.value)))
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case Int16:
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return int64(int16(uintptr(v.value)))
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case Int32:
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if unsafe.Sizeof(int32(0)) <= unsafe.Sizeof(uintptr(0)) {
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return int64(int32(uintptr(v.value)))
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} else {
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return int64(*(*int32)(v.value))
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}
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return int64(uintptr(v.value))
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case Int64:
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if unsafe.Sizeof(int64(0)) <= unsafe.Sizeof(uintptr(0)) {
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return int64(uintptr(v.value))
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} else {
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return *(*int64)(v.value)
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}
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default:
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panic(&ValueError{"Int"})
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}
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}
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func (v Value) Uint() uint64 {
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panic("unimplemented: (reflect.Value).Uint()")
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switch v.Type().Kind() {
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case Uintptr, Uint8, Uint16:
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return uint64(uintptr(v.value))
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case Uint:
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if unsafe.Sizeof(uint(0)) <= unsafe.Sizeof(uintptr(0)) {
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return uint64(uintptr(v.value))
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} else {
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// For systems with 16-bit pointers.
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return uint64(*(*uint)(v.value))
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}
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case Uint32:
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if unsafe.Sizeof(uint32(0)) <= unsafe.Sizeof(uintptr(0)) {
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return uint64(uintptr(v.value))
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} else {
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// For systems with 16-bit pointers.
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return uint64(*(*uint32)(v.value))
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}
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case Uint64:
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if unsafe.Sizeof(uint64(0)) <= unsafe.Sizeof(uintptr(0)) {
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return uint64(uintptr(v.value))
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} else {
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// For systems with 16-bit or 32-bit pointers.
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return *(*uint64)(v.value)
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}
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default:
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panic(&ValueError{"Uint"})
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}
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}
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func (v Value) Float() float64 {
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panic("unimplemented: (reflect.Value).Float()")
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switch v.Type().Kind() {
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case Float32:
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if unsafe.Sizeof(float32(0)) <= unsafe.Sizeof(uintptr(0)) {
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// The float is directly stored in the interface value on systems
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// with 32-bit and 64-bit pointers.
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return float64(*(*float32)(unsafe.Pointer(&v.value)))
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} else {
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// The float is stored as an external value on systems with 16-bit
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// pointers.
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return float64(*(*float32)(v.value))
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}
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case Float64:
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if unsafe.Sizeof(float64(0)) <= unsafe.Sizeof(uintptr(0)) {
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// The float is directly stored in the interface value on systems
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// with 64-bit pointers.
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return *(*float64)(unsafe.Pointer(&v.value))
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} else {
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// For systems with 16-bit and 32-bit pointers.
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return *(*float64)(v.value)
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}
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default:
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panic(&ValueError{"Float"})
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}
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}
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func (v Value) Complex() complex128 {
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panic("unimplemented: (reflect.Value).Complex()")
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switch v.Type().Kind() {
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case Complex64:
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if unsafe.Sizeof(complex64(0)) <= unsafe.Sizeof(uintptr(0)) {
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// The complex number is directly stored in the interface value on
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// systems with 64-bit pointers.
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return complex128(*(*complex64)(unsafe.Pointer(&v.value)))
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} else {
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// The complex number is stored as an external value on systems with
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// 16-bit and 32-bit pointers.
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return complex128(*(*complex64)(v.value))
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}
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case Complex128:
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// This is a 128-bit value, which is always stored as an external value.
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// It may be stored in the pointer directly on very uncommon
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// architectures with 128-bit pointers, however.
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return *(*complex128)(v.value)
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default:
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panic(&ValueError{"Complex"})
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}
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}
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func (v Value) String() string {
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panic("unimplemented: (reflect.Value).String()")
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switch v.Type().Kind() {
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case String:
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// A string value is always bigger than a pointer as it is made of a
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// pointer and a length.
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return *(*string)(v.value)
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default:
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// Special case because of the special treatment of .String() in Go.
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return "<T>"
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}
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}
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func (v Value) Bytes() []byte {
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@ -147,3 +259,11 @@ func (v Value) SetString(x string) {
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func MakeSlice(typ Type, len, cap int) Value {
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panic("unimplemented: reflect.MakeSlice()")
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}
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type ValueError struct {
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Method string
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}
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func (e *ValueError) Error() string {
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return "reflect: call of reflect.Value." + e.Method + " on invalid type"
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}
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62
testdata/reflect.go
предоставленный
62
testdata/reflect.go
предоставленный
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@ -1,6 +1,9 @@
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package main
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import "reflect"
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import (
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"reflect"
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"unsafe"
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)
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type myint int
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@ -9,4 +12,61 @@ func main() {
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println(reflect.TypeOf(int(3)) == reflect.TypeOf(int(5)))
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println(reflect.TypeOf(int(3)) == reflect.TypeOf(uint(5)))
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println(reflect.TypeOf(myint(3)) == reflect.TypeOf(int(5)))
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println("\nvalues of interfaces")
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for _, v := range []interface{}{
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true,
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false,
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int(2000),
|
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int(-2000),
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uint(2000),
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int8(-3),
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int8(3),
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uint8(200),
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int16(-300),
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int16(300),
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uint16(50000),
|
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int32(7 << 20),
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int32(-7 << 20),
|
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uint32(7 << 20),
|
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int64(9 << 40),
|
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int64(-9 << 40),
|
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uint64(9 << 40),
|
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uintptr(12345),
|
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float32(3.14),
|
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float64(3.14),
|
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complex64(1.2 + 0.3i),
|
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complex128(1.3 + 0.4i),
|
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"foo",
|
||||
unsafe.Pointer(new(int)),
|
||||
} {
|
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showValue(v)
|
||||
}
|
||||
}
|
||||
|
||||
func showValue(v interface{}) {
|
||||
rv := reflect.ValueOf(v)
|
||||
rt := rv.Type()
|
||||
if reflect.TypeOf(v) != rt {
|
||||
panic("direct TypeOf() is different from ValueOf().Type()")
|
||||
}
|
||||
println("reflect type:", rt.Kind().String())
|
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switch rt.Kind() {
|
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case reflect.Bool:
|
||||
println(" bool:", rv.Bool())
|
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
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println(" int:", rv.Int())
|
||||
case reflect.Uint, reflect.Uintptr, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
|
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println(" uint:", rv.Uint())
|
||||
case reflect.Float32, reflect.Float64:
|
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println(" float:", rv.Float())
|
||||
case reflect.Complex64, reflect.Complex128:
|
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println(" complex:", rv.Complex())
|
||||
case reflect.String:
|
||||
println(" string:", rv.String())
|
||||
case reflect.UnsafePointer:
|
||||
println(" pointer:", rv.Pointer() != 0)
|
||||
default:
|
||||
println(" unknown type kind!")
|
||||
}
|
||||
}
|
||||
|
|
|
|||
50
testdata/reflect.txt
предоставленный
50
testdata/reflect.txt
предоставленный
|
|
@ -2,3 +2,53 @@ matching types
|
|||
true
|
||||
false
|
||||
false
|
||||
|
||||
values of interfaces
|
||||
reflect type: bool
|
||||
bool: true
|
||||
reflect type: bool
|
||||
bool: false
|
||||
reflect type: int
|
||||
int: 2000
|
||||
reflect type: int
|
||||
int: -2000
|
||||
reflect type: uint
|
||||
uint: 2000
|
||||
reflect type: int8
|
||||
int: -3
|
||||
reflect type: int8
|
||||
int: 3
|
||||
reflect type: uint8
|
||||
uint: 200
|
||||
reflect type: int16
|
||||
int: -300
|
||||
reflect type: int16
|
||||
int: 300
|
||||
reflect type: uint16
|
||||
uint: 50000
|
||||
reflect type: int32
|
||||
int: 7340032
|
||||
reflect type: int32
|
||||
int: -7340032
|
||||
reflect type: uint32
|
||||
uint: 7340032
|
||||
reflect type: int64
|
||||
int: 9895604649984
|
||||
reflect type: int64
|
||||
int: -9895604649984
|
||||
reflect type: uint64
|
||||
uint: 9895604649984
|
||||
reflect type: uintptr
|
||||
uint: 12345
|
||||
reflect type: float32
|
||||
float: +3.140000e+000
|
||||
reflect type: float64
|
||||
float: +3.140000e+000
|
||||
reflect type: complex64
|
||||
complex: (+1.200000e+000+3.000000e-001i)
|
||||
reflect type: complex128
|
||||
complex: (+1.300000e+000+4.000000e-001i)
|
||||
reflect type: string
|
||||
string: foo
|
||||
reflect type: unsafe.Pointer
|
||||
pointer: true
|
||||
|
|
|
|||
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Создание таблицы
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