mirror of
https://github.com/golang/go
synced 2024-11-18 19:54:44 -07:00
01f8cd246d
They will be deleted from their current homes once this has landed. Changes made to import paths to make the code compile, and to find errchk in the right place in cmd/vet's Makefile. TODO in a later CL: tidy up vet. R=golang-dev, gri CC=golang-dev https://golang.org/cl/9495043
534 lines
12 KiB
Go
534 lines
12 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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// Identify mismatches between assembly files and Go func declarations.
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package main
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import (
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"bytes"
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"fmt"
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"go/ast"
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"go/token"
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"regexp"
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"strconv"
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"strings"
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)
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// 'kind' is a kind of assembly variable.
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// The kinds 1, 2, 4, 8 stand for values of that size.
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type asmKind int
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// These special kinds are not valid sizes.
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const (
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asmString asmKind = 100 + iota
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asmSlice
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asmInterface
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asmEmptyInterface
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)
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// An asmArch describes assembly parameters for an architecture
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type asmArch struct {
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name string
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ptrSize int
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intSize int
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bigEndian bool
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}
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// An asmFunc describes the expected variables for a function on a given architecture.
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type asmFunc struct {
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arch *asmArch
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size int // size of all arguments
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vars map[string]*asmVar
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varByOffset map[int]*asmVar
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}
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// An asmVar describes a single assembly variable.
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type asmVar struct {
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name string
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kind asmKind
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typ string
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off int
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size int
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inner []*asmVar
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}
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var (
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asmArch386 = asmArch{"386", 4, 4, false}
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asmArchArm = asmArch{"arm", 4, 4, false}
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asmArchAmd64 = asmArch{"amd64", 8, 8, false}
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arches = []*asmArch{
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&asmArch386,
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&asmArchArm,
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&asmArchAmd64,
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}
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)
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var (
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re = regexp.MustCompile
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asmPlusBuild = re(`//\s+\+build\s+([^\n]+)`)
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asmTEXT = re(`\bTEXT\b.*·([^\(]+)\(SB\)(?:\s*,\s*([0-9]+))?(?:\s*,\s*\$([0-9]+)(?:-([0-9]+))?)?`)
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asmDATA = re(`\b(DATA|GLOBL)\b`)
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asmNamedFP = re(`([a-zA-Z0-9_\xFF-\x{10FFFF}]+)(?:\+([0-9]+))\(FP\)`)
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asmUnnamedFP = re(`[^+\-0-9]](([0-9]+)\(FP\))`)
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asmOpcode = re(`^\s*(?:[A-Z0-9a-z_]+:)?\s*([A-Z]+)\s*([^,]*)(?:,\s*(.*))?`)
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)
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func asmCheck(pkg *Package) {
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if !vet("asmdecl") {
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return
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}
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// No work if no assembly files.
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if !pkg.hasFileWithSuffix(".s") {
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return
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}
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// Gather declarations. knownFunc[name][arch] is func description.
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knownFunc := make(map[string]map[string]*asmFunc)
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for _, f := range pkg.files {
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if f.file != nil {
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for _, decl := range f.file.Decls {
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if decl, ok := decl.(*ast.FuncDecl); ok && decl.Body == nil {
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knownFunc[decl.Name.Name] = f.asmParseDecl(decl)
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}
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}
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}
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}
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var fn *asmFunc
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for _, f := range pkg.files {
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if !strings.HasSuffix(f.name, ".s") {
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continue
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}
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Println("Checking file", f.name)
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// Determine architecture from file name if possible.
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var arch string
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for _, a := range arches {
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if strings.HasSuffix(f.name, "_"+a.name+".s") {
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arch = a.name
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break
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}
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}
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lines := strings.SplitAfter(string(f.content), "\n")
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for lineno, line := range lines {
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lineno++
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warnf := func(format string, args ...interface{}) {
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f.Warnf(token.NoPos, "%s:%d: [%s] %s", f.name, lineno, arch, fmt.Sprintf(format, args...))
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}
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if arch == "" {
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// Determine architecture from +build line if possible.
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if m := asmPlusBuild.FindStringSubmatch(line); m != nil {
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Fields:
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for _, fld := range strings.Fields(m[1]) {
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for _, a := range arches {
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if a.name == fld {
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arch = a.name
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break Fields
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}
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}
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}
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}
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}
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if m := asmTEXT.FindStringSubmatch(line); m != nil {
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if arch == "" {
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f.Warnf(token.NoPos, "%s: cannot determine architecture for assembly file", f.name)
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return
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}
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fn = knownFunc[m[1]][arch]
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if fn != nil {
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size, _ := strconv.Atoi(m[4])
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if size != fn.size && (m[2] != "7" || size != 0) {
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warnf("wrong argument size %d; expected $...-%d", size, fn.size)
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}
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}
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continue
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} else if strings.Contains(line, "TEXT") && strings.Contains(line, "SB") {
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// function, but not visible from Go (didn't match asmTEXT), so stop checking
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fn = nil
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continue
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}
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if asmDATA.FindStringSubmatch(line) != nil {
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fn = nil
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}
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if fn == nil {
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continue
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}
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for _, m := range asmUnnamedFP.FindAllStringSubmatch(line, -1) {
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warnf("use of unnamed argument %s", m[1])
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}
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for _, m := range asmNamedFP.FindAllStringSubmatch(line, -1) {
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name := m[1]
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off := 0
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if m[2] != "" {
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off, _ = strconv.Atoi(m[2])
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}
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v := fn.vars[name]
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if v == nil {
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// Allow argframe+0(FP).
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if name == "argframe" && off == 0 {
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continue
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}
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v = fn.varByOffset[off]
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if v != nil {
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warnf("unknown variable %s; offset %d is %s+%d(FP)", name, off, v.name, v.off)
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} else {
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warnf("unknown variable %s", name)
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}
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continue
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}
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asmCheckVar(warnf, fn, line, m[0], off, v)
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}
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}
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}
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}
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// asmParseDecl parses a function decl for expected assembly variables.
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func (f *File) asmParseDecl(decl *ast.FuncDecl) map[string]*asmFunc {
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var (
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arch *asmArch
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fn *asmFunc
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offset int
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failed bool
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)
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addVar := func(outer string, v asmVar) {
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if vo := fn.vars[outer]; vo != nil {
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vo.inner = append(vo.inner, &v)
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}
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fn.vars[v.name] = &v
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for i := 0; i < v.size; i++ {
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fn.varByOffset[v.off+i] = &v
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}
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}
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addParams := func(list []*ast.Field) {
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for i, fld := range list {
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// Determine alignment, size, and kind of type in declaration.
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var align, size int
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var kind asmKind
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names := fld.Names
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typ := f.gofmt(fld.Type)
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switch t := fld.Type.(type) {
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default:
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switch typ {
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default:
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f.Warnf(fld.Type.Pos(), "unknown assembly argument type %s", typ)
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failed = true
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return
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case "int8", "uint8", "byte", "bool":
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size = 1
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case "int16", "uint16":
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size = 2
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case "int32", "uint32", "float32":
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size = 4
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case "int64", "uint64", "float64":
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align = arch.ptrSize
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size = 8
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case "int", "uint":
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size = arch.intSize
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case "uintptr", "iword", "Word", "Errno", "unsafe.Pointer":
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size = arch.ptrSize
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case "string":
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size = arch.ptrSize * 2
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align = arch.ptrSize
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kind = asmString
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}
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case *ast.ChanType, *ast.FuncType, *ast.MapType, *ast.StarExpr:
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size = arch.ptrSize
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case *ast.InterfaceType:
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align = arch.ptrSize
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size = 2 * arch.ptrSize
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if len(t.Methods.List) > 0 {
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kind = asmInterface
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} else {
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kind = asmEmptyInterface
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}
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case *ast.ArrayType:
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if t.Len == nil {
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size = arch.ptrSize + 2*arch.intSize
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align = arch.ptrSize
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kind = asmSlice
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break
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}
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f.Warnf(fld.Type.Pos(), "unsupported assembly argument type %s", typ)
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failed = true
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case *ast.StructType:
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f.Warnf(fld.Type.Pos(), "unsupported assembly argument type %s", typ)
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failed = true
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}
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if align == 0 {
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align = size
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}
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if kind == 0 {
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kind = asmKind(size)
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}
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offset += -offset & (align - 1)
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// Create variable for each name being declared with this type.
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if len(names) == 0 {
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name := "unnamed"
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if decl.Type.Results != nil && len(decl.Type.Results.List) > 0 && &list[0] == &decl.Type.Results.List[0] && i == 0 {
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// Assume assembly will refer to single unnamed result as r.
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name = "ret"
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}
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names = []*ast.Ident{{Name: name}}
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}
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for _, id := range names {
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name := id.Name
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addVar("", asmVar{
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name: name,
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kind: kind,
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typ: typ,
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off: offset,
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size: size,
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})
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switch kind {
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case 8:
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if arch.ptrSize == 4 {
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w1, w2 := "lo", "hi"
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if arch.bigEndian {
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w1, w2 = w2, w1
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}
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addVar(name, asmVar{
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name: name + "_" + w1,
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kind: 4,
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typ: "half " + typ,
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off: offset,
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size: 4,
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})
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addVar(name, asmVar{
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name: name + "_" + w2,
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kind: 4,
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typ: "half " + typ,
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off: offset + 4,
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size: 4,
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})
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}
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case asmEmptyInterface:
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addVar(name, asmVar{
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name: name + "_type",
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kind: asmKind(arch.ptrSize),
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typ: "interface type",
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off: offset,
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size: arch.ptrSize,
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})
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addVar(name, asmVar{
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name: name + "_data",
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kind: asmKind(arch.ptrSize),
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typ: "interface data",
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off: offset + arch.ptrSize,
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size: arch.ptrSize,
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})
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case asmInterface:
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addVar(name, asmVar{
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name: name + "_itable",
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kind: asmKind(arch.ptrSize),
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typ: "interface itable",
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off: offset,
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size: arch.ptrSize,
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})
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addVar(name, asmVar{
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name: name + "_data",
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kind: asmKind(arch.ptrSize),
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typ: "interface data",
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off: offset + arch.ptrSize,
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size: arch.ptrSize,
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})
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case asmSlice:
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addVar(name, asmVar{
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name: name + "_base",
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kind: asmKind(arch.ptrSize),
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typ: "slice base",
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off: offset,
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size: arch.ptrSize,
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})
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addVar(name, asmVar{
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name: name + "_len",
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kind: asmKind(arch.intSize),
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typ: "slice len",
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off: offset + arch.ptrSize,
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size: arch.intSize,
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})
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addVar(name, asmVar{
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name: name + "_cap",
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kind: asmKind(arch.intSize),
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typ: "slice cap",
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off: offset + arch.ptrSize + arch.intSize,
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size: arch.intSize,
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})
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case asmString:
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addVar(name, asmVar{
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name: name + "_base",
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kind: asmKind(arch.ptrSize),
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typ: "string base",
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off: offset,
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size: arch.ptrSize,
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})
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addVar(name, asmVar{
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name: name + "_len",
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kind: asmKind(arch.intSize),
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typ: "string len",
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off: offset + arch.ptrSize,
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size: arch.intSize,
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})
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}
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offset += size
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}
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}
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}
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m := make(map[string]*asmFunc)
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for _, arch = range arches {
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fn = &asmFunc{
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arch: arch,
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vars: make(map[string]*asmVar),
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varByOffset: make(map[int]*asmVar),
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}
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offset = 0
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addParams(decl.Type.Params.List)
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if decl.Type.Results != nil && len(decl.Type.Results.List) > 0 {
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offset += -offset & (arch.ptrSize - 1)
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addParams(decl.Type.Results.List)
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}
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fn.size = offset
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m[arch.name] = fn
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}
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if failed {
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return nil
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}
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return m
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}
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// asmCheckVar checks a single variable reference.
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func asmCheckVar(warnf func(string, ...interface{}), fn *asmFunc, line, expr string, off int, v *asmVar) {
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m := asmOpcode.FindStringSubmatch(line)
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if m == nil {
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warnf("cannot find assembly opcode")
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}
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// Determine operand sizes from instruction.
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// Typically the suffix suffices, but there are exceptions.
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var src, dst, kind asmKind
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op := m[1]
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switch fn.arch.name + "." + op {
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case "386.FMOVLP":
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src, dst = 8, 4
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case "arm.MOVD":
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src = 8
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case "arm.MOVW":
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src = 4
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case "arm.MOVH", "arm.MOVHU":
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src = 2
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case "arm.MOVB", "arm.MOVBU":
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src = 1
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default:
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if fn.arch.name == "386" || fn.arch.name == "amd64" {
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if strings.HasPrefix(op, "F") && (strings.HasSuffix(op, "D") || strings.HasSuffix(op, "DP")) {
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// FMOVDP, FXCHD, etc
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src = 8
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break
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}
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if strings.HasPrefix(op, "F") && (strings.HasSuffix(op, "F") || strings.HasSuffix(op, "FP")) {
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// FMOVFP, FXCHF, etc
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src = 4
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break
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}
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if strings.HasSuffix(op, "SD") {
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// MOVSD, SQRTSD, etc
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src = 8
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break
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}
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if strings.HasSuffix(op, "SS") {
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// MOVSS, SQRTSS, etc
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src = 4
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break
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}
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if strings.HasPrefix(op, "SET") {
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// SETEQ, etc
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src = 1
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break
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}
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switch op[len(op)-1] {
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case 'B':
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src = 1
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case 'W':
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src = 2
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case 'L':
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src = 4
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case 'D', 'Q':
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src = 8
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}
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}
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}
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if dst == 0 {
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dst = src
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}
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// Determine whether the match we're holding
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// is the first or second argument.
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if strings.Index(line, expr) > strings.Index(line, ",") {
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kind = dst
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} else {
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kind = src
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}
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vk := v.kind
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vt := v.typ
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switch vk {
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case asmInterface, asmEmptyInterface, asmString, asmSlice:
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// allow reference to first word (pointer)
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vk = v.inner[0].kind
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vt = v.inner[0].typ
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}
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if off != v.off {
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var inner bytes.Buffer
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for i, vi := range v.inner {
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if len(v.inner) > 1 {
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fmt.Fprintf(&inner, ",")
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}
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fmt.Fprintf(&inner, " ")
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if i == len(v.inner)-1 {
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fmt.Fprintf(&inner, "or ")
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}
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fmt.Fprintf(&inner, "%s+%d(FP)", vi.name, vi.off)
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}
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warnf("invalid offset %s; expected %s+%d(FP)%s", expr, v.name, v.off, inner.String())
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return
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}
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if kind != 0 && kind != vk {
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var inner bytes.Buffer
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if len(v.inner) > 0 {
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fmt.Fprintf(&inner, " containing")
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for i, vi := range v.inner {
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if i > 0 && len(v.inner) > 2 {
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fmt.Fprintf(&inner, ",")
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}
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fmt.Fprintf(&inner, " ")
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if i > 0 && i == len(v.inner)-1 {
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fmt.Fprintf(&inner, "and ")
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}
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fmt.Fprintf(&inner, "%s+%d(FP)", vi.name, vi.off)
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}
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}
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warnf("invalid %s of %s; %s is %d-byte value%s", op, expr, vt, vk, inner.String())
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}
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}
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