mirror of
https://github.com/golang/go
synced 2024-11-19 07:04:43 -07:00
8bb20b8231
Support for:
(*reflect.rtype).Field
(*reflect.rtype).FieldByName
reflect.MakeSlice
runtime.SetFinalizer
Details:
- analysis locates ssa.Functions for (reflect.Value).Call
and runtime.SetFinalizer during startup to that it can
special-case them during genCall. ('Call' is forthcoming.)
- The callsite.targets mechanism is only used for dynamic
calls now. For static calls we call callEdge during constraint
generation; this is a minor optimisation.
- Static calls to SetFinalizer are inlined so that the call
appears to go direct to the finalizer. (We'll use the same
trick for (reflect.Value).Call.)
- runtime.FuncForPC: treat as a no-op.
- Fixed pointer_test to properly deal with expectations
that are multi-sets.
- Inlined rtypeMethodByNameConstraint.addMethod.
- More tests.
R=crawshaw
CC=golang-dev
https://golang.org/cl/14682045
388 lines
17 KiB
Go
388 lines
17 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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"fmt"
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"code.google.com/p/go.tools/go/types"
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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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// Implementations may exploit information from the calling site
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// via cgn.callersite; for shared contours this is nil.
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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).Recv": ext۰reflect۰Value۰Recv,
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"(reflect.Value).Send": ext۰reflect۰Value۰Send,
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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).TryRecv": ext۰reflect۰Value۰Recv,
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"(reflect.Value).TrySend": ext۰reflect۰Value۰Send,
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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": ext۰reflect۰Append,
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"reflect.AppendSlice": ext۰reflect۰AppendSlice,
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"reflect.Copy": ext۰reflect۰Copy,
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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": ext۰reflect۰MakeFunc,
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"reflect.MakeMap": ext۰reflect۰MakeMap,
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"reflect.MakeSlice": ext۰reflect۰MakeSlice,
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"reflect.MapOf": ext۰reflect۰MapOf,
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"reflect.New": ext۰reflect۰New,
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"reflect.NewAt": ext۰reflect۰NewAt,
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"reflect.PtrTo": ext۰reflect۰PtrTo,
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"reflect.Select": ext۰reflect۰Select,
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"reflect.SliceOf": ext۰reflect۰SliceOf,
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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": ext۰reflect۰rtype۰Field,
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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": ext۰reflect۰rtype۰Method,
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"(*reflect.rtype).MethodByName": ext۰reflect۰rtype۰MethodByName,
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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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"crypto/aes.decryptBlockAsm": ext۰NoEffect,
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"crypto/aes.encryptBlockAsm": ext۰NoEffect,
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"crypto/aes.expandKeyAsm": ext۰NoEffect,
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"crypto/aes.hasAsm": ext۰NoEffect,
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"crypto/md5.block": ext۰NoEffect,
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"crypto/rc4.xorKeyStream": ext۰NoEffect,
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"crypto/sha1.block": ext۰NoEffect,
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"hash/crc32.castagnoliSSE42": ext۰NoEffect,
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"hash/crc32.haveSSE42": 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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"net.runtime_Semacquire": ext۰NoEffect,
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"net.runtime_Semrelease": ext۰NoEffect,
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"net.runtime_pollClose": ext۰NoEffect,
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"net.runtime_pollOpen": ext۰NoEffect,
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"net.runtime_pollReset": ext۰NoEffect,
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"net.runtime_pollServerInit": ext۰NoEffect,
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"net.runtime_pollSetDeadline": ext۰NoEffect,
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"net.runtime_pollUnblock": ext۰NoEffect,
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"net.runtime_pollWait": 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": ext۰NoEffect,
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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": ext۰runtime۰SetFinalizer,
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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_Syncsemacquire": ext۰NoEffect,
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"sync.runtime_Syncsemcheck": ext۰NoEffect,
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"sync.runtime_Syncsemrelease": ext۰NoEffect,
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"sync/atomic.AddInt32": ext۰NoEffect,
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"sync/atomic.AddUint32": ext۰NoEffect,
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"sync/atomic.CompareAndSwapInt32": ext۰NoEffect,
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"sync/atomic.CompareAndSwapUint32": ext۰NoEffect,
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"sync/atomic.CompareAndSwapUint64": ext۰NoEffect,
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"sync/atomic.CompareAndSwapUintptr": ext۰NoEffect,
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"sync/atomic.LoadInt32": ext۰NoEffect,
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"sync/atomic.LoadUint32": ext۰NoEffect,
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"sync/atomic.LoadUint64": 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.RawSyscall6": ext۰NoEffect,
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"syscall.Syscall": ext۰NoEffect,
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"syscall.Syscall6": ext۰NoEffect,
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"syscall.runtime_AfterFork": ext۰NoEffect,
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"syscall.runtime_BeforeFork": 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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if fn.Pkg != nil && a.reflectValueObj != nil && a.reflectValueObj.Pkg() == fn.Pkg.Object {
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if !a.config.Reflection {
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impl = ext۰NoEffect // reflection disabled
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} else if impl == nil {
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// Ensure all "reflect" code is treated intrinsically.
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impl = ext۰NotYetImplemented
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}
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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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// Many intrinsics (such as CompareAndSwapInt32) have a fourth kind of
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// effect: loading or storing through a pointer. Though these could
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// be significant, we deliberately ignore them because they are
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// generally not worth the effort.
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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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// ---------- func runtime.SetFinalizer(x, f interface{}) ----------
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// runtime.SetFinalizer(x, f)
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type runtimeSetFinalizerConstraint struct {
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targets nodeid
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f nodeid // (ptr)
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x nodeid
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}
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func (c *runtimeSetFinalizerConstraint) String() string {
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return fmt.Sprintf("runtime.SetFinalizer(n%d, n%d)", c.x, c.f)
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}
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func (c *runtimeSetFinalizerConstraint) ptr() nodeid {
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return c.f
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}
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func (c *runtimeSetFinalizerConstraint) solve(a *analysis, _ *node, delta nodeset) {
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for fObj := range delta {
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tDyn, f, indirect := a.taggedValue(fObj)
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if tDyn == nil {
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panic("not a tagged object")
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}
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if indirect {
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// TODO(adonovan): we'll need to implement this
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// when we start creating indirect tagged objects.
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panic("indirect tagged object")
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}
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tSig, ok := tDyn.Underlying().(*types.Signature)
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||
if !ok {
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continue // not a function
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||
}
|
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if tSig.Recv() != nil {
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panic(tSig)
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}
|
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if tSig.Params().Len() != 1 {
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continue // not a unary function
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||
}
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|
||
// Extract x to tmp.
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tx := tSig.Params().At(0).Type()
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tmp := a.addNodes(tx, "SetFinalizer.tmp")
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a.untag(tx, tmp, c.x, false)
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// Call f(tmp).
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a.store(f, tmp, 1, a.sizeof(tx))
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|
||
// Add dynamic call target.
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if a.onlineCopy(c.targets, f) {
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a.addWork(c.targets)
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}
|
||
}
|
||
}
|
||
|
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func ext۰runtime۰SetFinalizer(a *analysis, cgn *cgnode) {
|
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// This is the shared contour, used for dynamic calls.
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targets := a.addOneNode(tInvalid, "SetFinalizer.targets", nil)
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cgn.sites = append(cgn.sites, &callsite{targets: targets})
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params := a.funcParams(cgn.obj)
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a.addConstraint(&runtimeSetFinalizerConstraint{
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targets: targets,
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x: params,
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f: params + 1,
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})
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||
}
|