mirror of
https://github.com/golang/go
synced 2024-10-01 13:18:33 -06:00
94c387c610
The implementation follows the basic pattern of an indirect
function call (genDynamicCall).
We use the same trick as SetFinalizer so that direct calls to
(r.V).Call, which are overwhelmingly the norm, are inlined.
Bug fix (and simplification): calling untag() to unbox a
reflect.Value is wrong for reflect.Values containing interfaces
(rare). Now, we call untag for concrete types and typeFilter
for interface types, and we can use this pattern in all cases.
It corresponds to the ssa.TypeAssert operator, so we call
it typeAssert. Added tests to cover this.
We also specialize reflect.{In,Out} when the operand is an int
literal.
+ Tests.
Also:
- make taggedValue() panic, not return nil, eliminating many checks.
We call isTaggedValue for the one place that cares.
- pointer_test: recover from panics in Analyze() and dump the log.
R=crawshaw
CC=golang-dev
https://golang.org/cl/14426050
385 lines
17 KiB
Go
385 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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||
}
|
||
|
||
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 indirect {
|
||
// 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)
|
||
if !ok {
|
||
continue // not a function
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||
}
|
||
if tSig.Recv() != nil {
|
||
panic(tSig)
|
||
}
|
||
if tSig.Params().Len() != 1 {
|
||
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.typeAssert(tx, tmp, c.x, false)
|
||
|
||
// Call f(tmp).
|
||
a.store(f, tmp, 1, a.sizeof(tx))
|
||
|
||
// Add dynamic call target.
|
||
if a.onlineCopy(c.targets, f) {
|
||
a.addWork(c.targets)
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||
}
|
||
}
|
||
}
|
||
|
||
func ext۰runtime۰SetFinalizer(a *analysis, cgn *cgnode) {
|
||
// 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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||
}
|