mirror of
https://github.com/golang/go
synced 2024-11-19 00:14:39 -07:00
5cbf2abd36
&x.f, &x[0], x[i:j], &*x all must panic if x==nil. The first three are already addressed by the semantics of FieldAddr, IndexAddr, Slice; updated docs to reflect this. The final case requires generation of an additional dynamic check. See golang.org/s/go12nil for details. Tested on $GOROOT/test/nilptr2.go (with patch from CL 13108043) Also: remove a TODO where a no-op will do. R=gri, crawshaw CC=golang-dev, rsc https://golang.org/cl/13064044
358 lines
15 KiB
Go
358 lines
15 KiB
Go
// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package interp
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// Emulated functions that we cannot interpret because they are
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// external or because they use "unsafe" or "reflect" operations.
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import (
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"math"
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"os"
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"runtime"
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"syscall"
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"time"
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"code.google.com/p/go.tools/ssa"
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)
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type externalFn func(fn *ssa.Function, args []value) value
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// TODO(adonovan): fix: reflect.Value abstracts an lvalue or an
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// rvalue; Set() causes mutations that can be observed via aliases.
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// We have not captured that correctly here.
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// Key strings are from Function.FullName().
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// That little dot ۰ is an Arabic zero numeral (U+06F0), categories [Nd].
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var externals = map[string]externalFn{
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"(reflect.Value).Bool": ext۰reflect۰Value۰Bool,
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"(reflect.Value).CanAddr": ext۰reflect۰Value۰CanAddr,
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"(reflect.Value).CanInterface": ext۰reflect۰Value۰CanInterface,
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"(reflect.Value).Elem": ext۰reflect۰Value۰Elem,
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"(reflect.Value).Field": ext۰reflect۰Value۰Field,
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"(reflect.Value).Index": ext۰reflect۰Value۰Index,
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"(reflect.Value).Int": ext۰reflect۰Value۰Int,
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"(reflect.Value).Interface": ext۰reflect۰Value۰Interface,
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"(reflect.Value).IsNil": ext۰reflect۰Value۰IsNil,
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"(reflect.Value).IsValid": ext۰reflect۰Value۰IsValid,
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"(reflect.Value).Kind": ext۰reflect۰Value۰Kind,
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"(reflect.Value).Len": ext۰reflect۰Value۰Len,
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"(reflect.Value).NumField": ext۰reflect۰Value۰NumField,
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"(reflect.Value).Pointer": ext۰reflect۰Value۰Pointer,
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"(reflect.Value).String": ext۰reflect۰Value۰String,
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"(reflect.Value).Type": ext۰reflect۰Value۰Type,
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"(reflect.error).Error": ext۰reflect۰error۰Error,
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"(reflect.rtype).Bits": ext۰reflect۰rtype۰Bits,
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"(reflect.rtype).Elem": ext۰reflect۰rtype۰Elem,
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"(reflect.rtype).Kind": ext۰reflect۰rtype۰Kind,
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"(reflect.rtype).NumOut": ext۰reflect۰rtype۰NumOut,
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"(reflect.rtype).Out": ext۰reflect۰rtype۰Out,
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"(reflect.rtype).String": ext۰reflect۰rtype۰String,
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"bytes.Equal": ext۰bytes۰Equal,
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"bytes.IndexByte": ext۰bytes۰IndexByte,
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"math.Float32bits": ext۰math۰Float32bits,
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"math.Float32frombits": ext۰math۰Float32frombits,
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"math.Float64bits": ext۰math۰Float64bits,
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"math.Float64frombits": ext۰math۰Float64frombits,
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"reflect.TypeOf": ext۰reflect۰TypeOf,
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"reflect.ValueOf": ext۰reflect۰ValueOf,
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"reflect.init": ext۰reflect۰Init,
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"reflect.valueInterface": ext۰reflect۰valueInterface,
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"runtime.Breakpoint": ext۰runtime۰Breakpoint,
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"runtime.GC": ext۰runtime۰GC,
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"runtime.GOMAXPROCS": ext۰runtime۰GOMAXPROCS,
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"runtime.Gosched": ext۰runtime۰Gosched,
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"runtime.NumCPU": ext۰runtime۰NumCPU,
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"runtime.ReadMemStats": ext۰runtime۰ReadMemStats,
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"runtime.SetFinalizer": ext۰runtime۰SetFinalizer,
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"runtime.getgoroot": ext۰runtime۰getgoroot,
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"sync.runtime_Syncsemcheck": ext۰sync۰runtime_Syncsemcheck,
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"sync/atomic.AddInt32": ext۰atomic۰AddInt32,
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"sync/atomic.CompareAndSwapInt32": ext۰atomic۰CompareAndSwapInt32,
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"sync/atomic.LoadInt32": ext۰atomic۰LoadInt32,
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"sync/atomic.LoadUint32": ext۰atomic۰LoadUint32,
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"sync/atomic.StoreInt32": ext۰atomic۰StoreInt32,
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"sync/atomic.StoreUint32": ext۰atomic۰StoreUint32,
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"syscall.Close": ext۰syscall۰Close,
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"syscall.Exit": ext۰syscall۰Exit,
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"syscall.Fstat": ext۰syscall۰Fstat,
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"syscall.Getpid": ext۰syscall۰Getpid,
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"syscall.Getwd": ext۰syscall۰Getwd,
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"syscall.Kill": ext۰syscall۰Kill,
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"syscall.Lstat": ext۰syscall۰Lstat,
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"syscall.Open": ext۰syscall۰Open,
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"syscall.ParseDirent": ext۰syscall۰ParseDirent,
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"syscall.Read": ext۰syscall۰Read,
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"syscall.ReadDirent": ext۰syscall۰ReadDirent,
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"syscall.Stat": ext۰syscall۰Stat,
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"syscall.Write": ext۰syscall۰Write,
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"time.Sleep": ext۰time۰Sleep,
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"time.now": ext۰time۰now,
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}
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// wrapError returns an interpreted 'error' interface value for err.
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func wrapError(err error) value {
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if err == nil {
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return iface{}
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}
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return iface{t: errorType, v: err.Error()}
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}
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func ext۰bytes۰Equal(fn *ssa.Function, args []value) value {
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// func Equal(a, b []byte) bool
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a := args[0].([]value)
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b := args[1].([]value)
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if len(a) != len(b) {
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return false
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}
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for i := range a {
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if a[i] != b[i] {
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return false
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}
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}
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return true
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}
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func ext۰bytes۰IndexByte(fn *ssa.Function, args []value) value {
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// func IndexByte(s []byte, c byte) int
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s := args[0].([]value)
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c := args[1].(byte)
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for i, b := range s {
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if b.(byte) == c {
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return i
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}
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}
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return -1
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}
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func ext۰math۰Float64frombits(fn *ssa.Function, args []value) value {
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return math.Float64frombits(args[0].(uint64))
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}
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func ext۰math۰Float64bits(fn *ssa.Function, args []value) value {
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return math.Float64bits(args[0].(float64))
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}
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func ext۰math۰Float32frombits(fn *ssa.Function, args []value) value {
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return math.Float32frombits(args[0].(uint32))
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}
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func ext۰math۰Float32bits(fn *ssa.Function, args []value) value {
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return math.Float32bits(args[0].(float32))
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}
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func ext۰runtime۰Breakpoint(fn *ssa.Function, args []value) value {
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runtime.Breakpoint()
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return nil
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}
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func ext۰runtime۰getgoroot(fn *ssa.Function, args []value) value {
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return os.Getenv("GOROOT")
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}
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func ext۰sync۰runtime_Syncsemcheck(fn *ssa.Function, args []value) value {
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return nil
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}
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func ext۰runtime۰GOMAXPROCS(fn *ssa.Function, args []value) value {
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return runtime.GOMAXPROCS(args[0].(int))
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}
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func ext۰runtime۰GC(fn *ssa.Function, args []value) value {
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runtime.GC()
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return nil
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}
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func ext۰runtime۰Gosched(fn *ssa.Function, args []value) value {
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runtime.Gosched()
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return nil
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}
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func ext۰runtime۰NumCPU(fn *ssa.Function, args []value) value {
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return runtime.NumCPU()
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}
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func ext۰runtime۰ReadMemStats(fn *ssa.Function, args []value) value {
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// TODO(adonovan): populate args[0].(Struct)
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return nil
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}
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func ext۰atomic۰LoadUint32(fn *ssa.Function, args []value) value {
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// TODO(adonovan): fix: not atomic!
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return (*args[0].(*value)).(uint32)
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}
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func ext۰atomic۰StoreUint32(fn *ssa.Function, args []value) value {
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// TODO(adonovan): fix: not atomic!
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*args[0].(*value) = args[1].(uint32)
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return nil
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}
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func ext۰atomic۰LoadInt32(fn *ssa.Function, args []value) value {
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// TODO(adonovan): fix: not atomic!
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return (*args[0].(*value)).(int32)
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}
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func ext۰atomic۰StoreInt32(fn *ssa.Function, args []value) value {
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// TODO(adonovan): fix: not atomic!
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*args[0].(*value) = args[1].(int32)
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return nil
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}
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func ext۰atomic۰CompareAndSwapInt32(fn *ssa.Function, args []value) value {
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// TODO(adonovan): fix: not atomic!
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p := args[0].(*value)
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if (*p).(int32) == args[1].(int32) {
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*p = args[2].(int32)
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return true
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}
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return false
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}
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func ext۰atomic۰AddInt32(fn *ssa.Function, args []value) value {
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// TODO(adonovan): fix: not atomic!
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p := args[0].(*value)
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newv := (*p).(int32) + args[1].(int32)
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*p = newv
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return newv
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}
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func ext۰runtime۰SetFinalizer(fn *ssa.Function, args []value) value {
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return nil // ignore
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}
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func ext۰time۰now(fn *ssa.Function, args []value) value {
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nano := time.Now().UnixNano()
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return tuple{int64(nano / 1e9), int32(nano % 1e9)}
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}
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func ext۰time۰Sleep(fn *ssa.Function, args []value) value {
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time.Sleep(time.Duration(args[0].(int64)))
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return nil
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}
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func ext۰syscall۰Exit(fn *ssa.Function, args []value) value {
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panic(exitPanic(args[0].(int)))
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}
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func ext۰syscall۰Getwd(fn *ssa.Function, args []value) value {
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s, err := syscall.Getwd()
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return tuple{s, wrapError(err)}
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}
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func ext۰syscall۰Getpid(fn *ssa.Function, args []value) value {
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return syscall.Getpid()
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}
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// The set of remaining native functions we need to implement (as needed):
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// crypto/aes/cipher_asm.go:10:func hasAsm() bool
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// crypto/aes/cipher_asm.go:11:func encryptBlockAsm(nr int, xk *uint32, dst, src *byte)
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// crypto/aes/cipher_asm.go:12:func decryptBlockAsm(nr int, xk *uint32, dst, src *byte)
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// crypto/aes/cipher_asm.go:13:func expandKeyAsm(nr int, key *byte, enc *uint32, dec *uint32)
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// hash/crc32/crc32_amd64.go:12:func haveSSE42() bool
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// hash/crc32/crc32_amd64.go:16:func castagnoliSSE42(crc uint32, p []byte) uint32
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// math/abs.go:12:func Abs(x float64) float64
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// math/asin.go:19:func Asin(x float64) float64
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// math/asin.go:51:func Acos(x float64) float64
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// math/atan.go:95:func Atan(x float64) float64
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// math/atan2.go:29:func Atan2(y, x float64) float64
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// math/big/arith_decl.go:8:func mulWW(x, y Word) (z1, z0 Word)
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// math/big/arith_decl.go:9:func divWW(x1, x0, y Word) (q, r Word)
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// math/big/arith_decl.go:10:func addVV(z, x, y []Word) (c Word)
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// math/big/arith_decl.go:11:func subVV(z, x, y []Word) (c Word)
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// math/big/arith_decl.go:12:func addVW(z, x []Word, y Word) (c Word)
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// math/big/arith_decl.go:13:func subVW(z, x []Word, y Word) (c Word)
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// math/big/arith_decl.go:14:func shlVU(z, x []Word, s uint) (c Word)
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// math/big/arith_decl.go:15:func shrVU(z, x []Word, s uint) (c Word)
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// math/big/arith_decl.go:16:func mulAddVWW(z, x []Word, y, r Word) (c Word)
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// math/big/arith_decl.go:17:func addMulVVW(z, x []Word, y Word) (c Word)
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// math/big/arith_decl.go:18:func divWVW(z []Word, xn Word, x []Word, y Word) (r Word)
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// math/big/arith_decl.go:19:func bitLen(x Word) (n int)
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// math/dim.go:13:func Dim(x, y float64) float64
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// math/dim.go:26:func Max(x, y float64) float64
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// math/dim.go:53:func Min(x, y float64) float64
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// math/exp.go:14:func Exp(x float64) float64
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// math/exp.go:135:func Exp2(x float64) float64
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// math/expm1.go:124:func Expm1(x float64) float64
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// math/floor.go:13:func Floor(x float64) float64
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// math/floor.go:36:func Ceil(x float64) float64
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// math/floor.go:48:func Trunc(x float64) float64
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// math/frexp.go:16:func Frexp(f float64) (frac float64, exp int)
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// math/hypot.go:17:func Hypot(p, q float64) float64
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// math/ldexp.go:14:func Ldexp(frac float64, exp int) float64
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// math/log.go:80:func Log(x float64) float64
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// math/log10.go:9:func Log10(x float64) float64
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// math/log10.go:17:func Log2(x float64) float64
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// math/log1p.go:95:func Log1p(x float64) float64
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// math/mod.go:21:func Mod(x, y float64) float64
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// math/modf.go:13:func Modf(f float64) (int float64, frac float64)
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// math/remainder.go:37:func Remainder(x, y float64) float64
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// math/sin.go:117:func Cos(x float64) float64
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// math/sin.go:174:func Sin(x float64) float64
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// math/sincos.go:15:func Sincos(x float64) (sin, cos float64)
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// math/sqrt.go:14:func Sqrt(x float64) float64
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// math/tan.go:82:func Tan(x float64) float64
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// os/file_posix.go:14:func sigpipe() // implemented in package runtime
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// os/signal/signal_unix.go:15:func signal_enable(uint32)
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// os/signal/signal_unix.go:16:func signal_recv() uint32
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// runtime/debug.go:13:func LockOSThread()
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// runtime/debug.go:17:func UnlockOSThread()
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// runtime/debug.go:30:func NumCgoCall() int64
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// runtime/debug.go:33:func NumGoroutine() int
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// runtime/debug.go:90:func MemProfile(p []MemProfileRecord, inuseZero bool) (n int, ok bool)
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// runtime/debug.go:114:func ThreadCreateProfile(p []StackRecord) (n int, ok bool)
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// runtime/debug.go:122:func GoroutineProfile(p []StackRecord) (n int, ok bool)
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// runtime/debug.go:132:func CPUProfile() []byte
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// runtime/debug.go:141:func SetCPUProfileRate(hz int)
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// runtime/debug.go:149:func SetBlockProfileRate(rate int)
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// runtime/debug.go:166:func BlockProfile(p []BlockProfileRecord) (n int, ok bool)
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// runtime/debug.go:172:func Stack(buf []byte, all bool) int
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// runtime/error.go:81:func typestring(interface{}) string
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// runtime/extern.go:19:func Goexit()
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// runtime/extern.go:27:func Caller(skip int) (pc uintptr, file string, line int, ok bool)
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// runtime/extern.go:34:func Callers(skip int, pc []uintptr) int
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// runtime/extern.go:51:func FuncForPC(pc uintptr) *Func
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// runtime/extern.go:68:func funcline_go(*Func, uintptr) (string, int)
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// runtime/extern.go:71:func mid() uint32
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// runtime/pprof/pprof.go:667:func runtime_cyclesPerSecond() int64
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// runtime/race.go:16:func RaceDisable()
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// runtime/race.go:19:func RaceEnable()
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// runtime/race.go:21:func RaceAcquire(addr unsafe.Pointer)
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// runtime/race.go:22:func RaceRelease(addr unsafe.Pointer)
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// runtime/race.go:23:func RaceReleaseMerge(addr unsafe.Pointer)
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// runtime/race.go:25:func RaceRead(addr unsafe.Pointer)
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// runtime/race.go:26:func RaceWrite(addr unsafe.Pointer)
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// runtime/race.go:28:func RaceSemacquire(s *uint32)
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// runtime/race.go:29:func RaceSemrelease(s *uint32)
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// sync/atomic/doc.go:49:func CompareAndSwapInt64(addr *int64, old, new int64) (swapped bool)
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// sync/atomic/doc.go:52:func CompareAndSwapUint32(addr *uint32, old, new uint32) (swapped bool)
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// sync/atomic/doc.go:55:func CompareAndSwapUint64(addr *uint64, old, new uint64) (swapped bool)
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// sync/atomic/doc.go:58:func CompareAndSwapUintptr(addr *uintptr, old, new uintptr) (swapped bool)
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// sync/atomic/doc.go:61:func CompareAndSwapPointer(addr *unsafe.Pointer, old, new unsafe.Pointer) (swapped bool)
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// sync/atomic/doc.go:67:func AddUint32(addr *uint32, delta uint32) (new uint32)
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// sync/atomic/doc.go:70:func AddInt64(addr *int64, delta int64) (new int64)
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// sync/atomic/doc.go:73:func AddUint64(addr *uint64, delta uint64) (new uint64)
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// sync/atomic/doc.go:76:func AddUintptr(addr *uintptr, delta uintptr) (new uintptr)
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// sync/atomic/doc.go:82:func LoadInt64(addr *int64) (val int64)
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// sync/atomic/doc.go:88:func LoadUint64(addr *uint64) (val uint64)
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// sync/atomic/doc.go:91:func LoadUintptr(addr *uintptr) (val uintptr)
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// sync/atomic/doc.go:94:func LoadPointer(addr *unsafe.Pointer) (val unsafe.Pointer)
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// sync/atomic/doc.go:100:func StoreInt64(addr *int64, val int64)
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// sync/atomic/doc.go:106:func StoreUint64(addr *uint64, val uint64)
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// sync/atomic/doc.go:109:func StoreUintptr(addr *uintptr, val uintptr)
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// sync/atomic/doc.go:112:func StorePointer(addr *unsafe.Pointer, val unsafe.Pointer)
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// sync/runtime.go:12:func runtime_Semacquire(s *uint32)
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// sync/runtime.go:18:func runtime_Semrelease(s *uint32)
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// syscall/env_unix.go:30:func setenv_c(k, v string)
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// syscall/syscall_linux_amd64.go:60:func Gettimeofday(tv *Timeval) (err error)
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// syscall/syscall_linux_amd64.go:61:func Time(t *Time_t) (tt Time_t, err error)
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// syscall/syscall_linux_arm.go:28:func Seek(fd int, offset int64, whence int) (newoffset int64, err error)
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// time/sleep.go:25:func startTimer(*runtimeTimer)
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// time/sleep.go:26:func stopTimer(*runtimeTimer) bool
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// time/time.go:758:func now() (sec int64, nsec int32)
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// unsafe/unsafe.go:27:func Sizeof(v ArbitraryType) uintptr
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// unsafe/unsafe.go:32:func Offsetof(v ArbitraryType) uintptr
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// unsafe/unsafe.go:37:func Alignof(v ArbitraryType) uintptr
|