mirror of
https://github.com/golang/go
synced 2024-11-18 22:24:50 -07:00
281 lines
14 KiB
Go
281 lines
14 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 pointer
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// This package defines the treatment of intrinsics, i.e. library
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// functions requiring special analytical treatment.
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//
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// Most of these are C or assembly functions, but even some Go
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// functions require may special treatment if the analysis completely
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// replaces the implementation of an API such as reflection.
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// TODO(adonovan): support a means of writing analytic summaries in
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// the target code, so that users can summarise the effects of their
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// own C functions using a snippet of Go.
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import (
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"code.google.com/p/go.tools/ssa"
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)
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// Instances of 'intrinsic' generate analysis constraints for calls to
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// intrinsic functions.
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type intrinsic func(a *analysis, cgn *cgnode)
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// Initialized in explicit init() to defeat (spurious) initialization
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// cycle error.
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var intrinsicsByName map[string]intrinsic
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func init() {
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// Key strings are from Function.String().
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// That little dot ۰ is an Arabic zero numeral (U+06F0),
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// categories [Nd].
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intrinsicsByName = map[string]intrinsic{
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// reflect.Value methods.
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// "(reflect.Value).Addr": ext۰reflect۰Value۰Addr,
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"(reflect.Value).Bool": ext۰NoEffect,
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// "(reflect.Value).Bytes": ext۰reflect۰Value۰Bytes,
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// "(reflect.Value).Call": ext۰reflect۰Value۰Call,
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// "(reflect.Value).CallSlice": ext۰reflect۰Value۰CallSlice,
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"(reflect.Value).CanAddr": ext۰NoEffect,
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"(reflect.Value).CanInterface": ext۰NoEffect,
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"(reflect.Value).CanSet": ext۰NoEffect,
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"(reflect.Value).Cap": ext۰NoEffect,
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"(reflect.Value).Close": ext۰NoEffect,
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"(reflect.Value).Complex": ext۰NoEffect,
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// "(reflect.Value).Convert": ext۰reflect۰Value۰Convert,
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// "(reflect.Value).Elem": ext۰reflect۰Value۰Elem,
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// "(reflect.Value).Field": ext۰reflect۰Value۰Field,
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// "(reflect.Value).FieldByIndex": ext۰reflect۰Value۰FieldByIndex,
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// "(reflect.Value).FieldByName": ext۰reflect۰Value۰FieldByName,
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// "(reflect.Value).FieldByNameFunc": ext۰reflect۰Value۰FieldByNameFunc,
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"(reflect.Value).Float": ext۰NoEffect,
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// "(reflect.Value).Index": ext۰reflect۰Value۰Index,
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"(reflect.Value).Int": ext۰NoEffect,
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// "(reflect.Value).Interface": ext۰reflect۰Value۰Interface,
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"(reflect.Value).InterfaceData": ext۰NoEffect,
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"(reflect.Value).IsNil": ext۰NoEffect,
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"(reflect.Value).IsValid": ext۰NoEffect,
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"(reflect.Value).Kind": ext۰NoEffect,
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"(reflect.Value).Len": ext۰NoEffect,
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// "(reflect.Value).MapIndex": ext۰reflect۰Value۰MapIndex,
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// "(reflect.Value).MapKeys": ext۰reflect۰Value۰MapKeys,
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// "(reflect.Value).Method": ext۰reflect۰Value۰Method,
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// "(reflect.Value).MethodByName": ext۰reflect۰Value۰MethodByName,
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"(reflect.Value).NumField": ext۰NoEffect,
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"(reflect.Value).NumMethod": ext۰NoEffect,
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"(reflect.Value).OverflowComplex": ext۰NoEffect,
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"(reflect.Value).OverflowFloat": ext۰NoEffect,
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"(reflect.Value).OverflowInt": ext۰NoEffect,
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"(reflect.Value).OverflowUint": ext۰NoEffect,
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"(reflect.Value).Pointer": ext۰NoEffect,
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// "(reflect.Value).Set": ext۰reflect۰Value۰Set,
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"(reflect.Value).SetBool": ext۰NoEffect,
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// "(reflect.Value).SetBytes": ext۰reflect۰Value۰SetBytes,
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"(reflect.Value).SetComplex": ext۰NoEffect,
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"(reflect.Value).SetFloat": ext۰NoEffect,
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"(reflect.Value).SetInt": ext۰NoEffect,
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"(reflect.Value).SetLen": ext۰NoEffect,
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// "(reflect.Value).SetMapIndex": ext۰reflect۰Value۰SetMapIndex,
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// "(reflect.Value).SetPointer": ext۰reflect۰Value۰SetPointer,
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"(reflect.Value).SetString": ext۰NoEffect,
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"(reflect.Value).SetUint": ext۰NoEffect,
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// "(reflect.Value).Slice": ext۰reflect۰Value۰Slice,
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"(reflect.Value).String": ext۰NoEffect,
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"(reflect.Value).Type": ext۰NoEffect,
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"(reflect.Value).Uint": ext۰NoEffect,
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"(reflect.Value).UnsafeAddr": ext۰NoEffect,
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// Standalone reflect.* functions.
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"reflect.Append": ext۰NotYetImplemented,
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"reflect.AppendSlice": ext۰NotYetImplemented,
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"reflect.Copy": ext۰NotYetImplemented,
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// "reflect.ChanOf": ext۰reflect۰ChanOf,
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"reflect.DeepEqual": ext۰NoEffect,
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// "reflect.Indirect": ext۰reflect۰Indirect,
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// "reflect.MakeChan": ext۰reflect۰MakeChan,
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"reflect.MakeFunc": ext۰NotYetImplemented,
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"reflect.MakeMap": ext۰NotYetImplemented,
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"reflect.MakeSlice": ext۰NotYetImplemented,
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"reflect.MapOf": ext۰NotYetImplemented,
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// "reflect.New": ext۰reflect۰New,
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// "reflect.NewAt": ext۰reflect۰NewAt,
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"reflect.PtrTo": ext۰NotYetImplemented,
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"reflect.Select": ext۰NotYetImplemented,
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"reflect.SliceOf": ext۰NotYetImplemented,
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// "reflect.TypeOf": ext۰reflect۰TypeOf,
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// "reflect.ValueOf": ext۰reflect۰ValueOf,
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// "reflect.Zero": ext۰reflect۰Zero,
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"reflect.init": ext۰NoEffect,
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// *reflect.rtype methods
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"(*reflect.rtype).Align": ext۰NoEffect,
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"(*reflect.rtype).AssignableTo": ext۰NoEffect,
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"(*reflect.rtype).Bits": ext۰NoEffect,
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"(*reflect.rtype).ChanDir": ext۰NoEffect,
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"(*reflect.rtype).ConvertibleTo": ext۰NoEffect,
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// "(*reflect.rtype).Elem": ext۰reflect۰rtype۰Elem,
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"(*reflect.rtype).Field": ext۰NotYetImplemented,
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"(*reflect.rtype).FieldAlign": ext۰NoEffect,
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// "(*reflect.rtype).FieldByIndex": ext۰reflect۰rtype۰FieldByIndex,
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// "(*reflect.rtype).FieldByName": ext۰reflect۰rtype۰FieldByName,
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// "(*reflect.rtype).FieldByNameFunc": ext۰reflect۰rtype۰FieldByNameFunc,
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"(*reflect.rtype).Implements": ext۰NoEffect,
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// "(*reflect.rtype).In": ext۰reflect۰rtype۰In,
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"(*reflect.rtype).IsVariadic": ext۰NoEffect,
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// "(*reflect.rtype).Key": ext۰reflect۰rtype۰Key,
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"(*reflect.rtype).Kind": ext۰NoEffect,
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"(*reflect.rtype).Len": ext۰NoEffect,
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"(*reflect.rtype).Method": ext۰NotYetImplemented,
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"(*reflect.rtype).MethodByName": ext۰NotYetImplemented,
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"(*reflect.rtype).Name": ext۰NoEffect,
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"(*reflect.rtype).NumField": ext۰NoEffect,
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"(*reflect.rtype).NumIn": ext۰NoEffect,
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"(*reflect.rtype).NumMethod": ext۰NoEffect,
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"(*reflect.rtype).NumOut": ext۰NoEffect,
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// "(*reflect.rtype).Out": ext۰reflect۰rtype۰Out,
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"(*reflect.rtype).PkgPath": ext۰NoEffect,
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"(*reflect.rtype).Size": ext۰NoEffect,
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"(*reflect.rtype).String": ext۰NoEffect,
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// Other packages.
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"bytes.Equal": ext۰NoEffect,
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"bytes.IndexByte": ext۰NoEffect,
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"math.Abs": ext۰NoEffect,
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"math.Acos": ext۰NoEffect,
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"math.Asin": ext۰NoEffect,
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"math.Atan": ext۰NoEffect,
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"math.Atan2": ext۰NoEffect,
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"math.Ceil": ext۰NoEffect,
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"math.Cos": ext۰NoEffect,
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"math.Dim": ext۰NoEffect,
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"math.Exp": ext۰NoEffect,
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"math.Exp2": ext۰NoEffect,
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"math.Expm1": ext۰NoEffect,
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"math.Float32bits": ext۰NoEffect,
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"math.Float32frombits": ext۰NoEffect,
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"math.Float64bits": ext۰NoEffect,
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"math.Float64frombits": ext۰NoEffect,
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"math.Floor": ext۰NoEffect,
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"math.Frexp": ext۰NoEffect,
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"math.Hypot": ext۰NoEffect,
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"math.Ldexp": ext۰NoEffect,
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"math.Log": ext۰NoEffect,
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"math.Log10": ext۰NoEffect,
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"math.Log1p": ext۰NoEffect,
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"math.Log2": ext۰NoEffect,
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"math.Max": ext۰NoEffect,
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"math.Min": ext۰NoEffect,
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"math.Mod": ext۰NoEffect,
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"math.Modf": ext۰NoEffect,
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"math.Remainder": ext۰NoEffect,
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"math.Sin": ext۰NoEffect,
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"math.Sincos": ext۰NoEffect,
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"math.Sqrt": ext۰NoEffect,
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"math.Tan": ext۰NoEffect,
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"math.Trunc": ext۰NoEffect,
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"math/big.addMulVVW": ext۰NoEffect,
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"math/big.addVV": ext۰NoEffect,
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"math/big.addVW": ext۰NoEffect,
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"math/big.bitLen": ext۰NoEffect,
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"math/big.divWVW": ext۰NoEffect,
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"math/big.divWW": ext۰NoEffect,
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"math/big.mulAddVWW": ext۰NoEffect,
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"math/big.mulWW": ext۰NoEffect,
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"math/big.shlVU": ext۰NoEffect,
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"math/big.shrVU": ext۰NoEffect,
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"math/big.subVV": ext۰NoEffect,
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"math/big.subVW": ext۰NoEffect,
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"os.epipecheck": ext۰NoEffect,
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"runtime.BlockProfile": ext۰NoEffect,
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"runtime.Breakpoint": ext۰NoEffect,
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"runtime.CPUProfile": ext۰NotYetImplemented,
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"runtime.Caller": ext۰NoEffect,
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"runtime.FuncForPC": ext۰NotYetImplemented,
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"runtime.GC": ext۰NoEffect,
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"runtime.GOMAXPROCS": ext۰NoEffect,
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"runtime.Goexit": ext۰NoEffect,
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"runtime.GoroutineProfile": ext۰NoEffect,
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"runtime.Gosched": ext۰NoEffect,
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"runtime.MemProfile": ext۰NoEffect,
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"runtime.NumCPU": ext۰NoEffect,
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"runtime.NumGoroutine": ext۰NoEffect,
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"runtime.ReadMemStats": ext۰NoEffect,
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"runtime.SetBlockProfileRate": ext۰NoEffect,
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"runtime.SetCPUProfileRate": ext۰NoEffect,
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"runtime.SetFinalizer": ext۰NotYetImplemented,
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"runtime.Stack": ext۰NoEffect,
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"runtime.ThreadCreateProfile": ext۰NoEffect,
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"runtime.funcentry_go": ext۰NoEffect,
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"runtime.funcline_go": ext۰NoEffect,
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"runtime.funcname_go": ext۰NoEffect,
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"runtime.getgoroot": ext۰NoEffect,
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"runtime/pprof.runtime_cyclesPerSecond": ext۰NoEffect,
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"strings.IndexByte": ext۰NoEffect,
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"sync.runtime_Semacquire": ext۰NoEffect,
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"sync.runtime_Semrelease": ext۰NoEffect,
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"sync.runtime_Syncsemcheck": ext۰NoEffect,
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"sync/atomic.AddInt32": ext۰NoEffect,
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"sync/atomic.CompareAndSwapInt32": ext۰NoEffect,
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"sync/atomic.LoadInt32": ext۰NoEffect,
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"sync/atomic.LoadUint32": ext۰NoEffect,
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"sync/atomic.StoreInt32": ext۰NoEffect,
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"sync/atomic.StoreUint32": ext۰NoEffect,
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"syscall.Close": ext۰NoEffect,
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"syscall.Exit": ext۰NoEffect,
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"syscall.Getpid": ext۰NoEffect,
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"syscall.Getwd": ext۰NoEffect,
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"syscall.Kill": ext۰NoEffect,
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"syscall.RawSyscall": ext۰NoEffect,
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"syscall.Syscall": ext۰NoEffect,
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"syscall.Syscall6": ext۰NoEffect,
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"time.Sleep": ext۰NoEffect,
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"time.now": ext۰NoEffect,
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"time.startTimer": ext۰NoEffect,
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"time.stopTimer": ext۰NoEffect,
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}
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}
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// findIntrinsic returns the constraint generation function for an
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// intrinsic function fn, or nil if the function should be handled normally.
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//
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func (a *analysis) findIntrinsic(fn *ssa.Function) intrinsic {
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// Consult the *Function-keyed cache.
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// A cached nil indicates a normal non-intrinsic function.
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impl, ok := a.intrinsics[fn]
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if !ok {
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impl = intrinsicsByName[fn.String()] // may be nil
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// Ensure all "reflect" code is treated intrinsically.
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if impl == nil && fn.Pkg != nil && a.reflectValueObj != nil && a.reflectValueObj.Pkg() == fn.Pkg.Object {
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impl = ext۰NotYetImplemented
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}
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a.intrinsics[fn] = impl
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}
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return impl
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}
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// A trivial intrinsic suitable for any function that does not:
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// 1) induce aliases between its arguments or any global variables;
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// 2) call any functions; or
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// 3) create any labels.
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//
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// We sometimes violate condition #3 if the function creates only
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// non-function labels, as the control-flow graph is still sound.
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//
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func ext۰NoEffect(a *analysis, cgn *cgnode) {}
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func ext۰NotYetImplemented(a *analysis, cgn *cgnode) {
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// TODO(adonovan): enable this warning when we've implemented
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// enough that it's not unbearably annoying.
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// a.warnf(fn.Pos(), "unsound: intrinsic treatment of %s not yet implemented", fn)
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}
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// We'll model reflect.Value as an interface{} containing pointers.
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// We must use pointers since some reflect.Values (those derived by
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// Field, Elem, etc) are abstractions of lvalues, not rvalues, and
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// mutations via Set are reflected in the underlying value. (We could
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// represent it as a union of lvalue and rvalue but that's more work.)
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