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cmd/cgo: pass end position info for C function arguments.

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Pass information about original end position for c function arguments
processed in pointer checking generated code.

Fixes #42580

Change-Id: Ic8a578168362f0ca6055064dbbea092ad37477a6
Reviewed-on: https://go-review.googlesource.com/c/go/+/269760
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
This commit is contained in:
wolf1996 2020-11-13 14:30:15 +03:00 committed by Ian Lance Taylor
parent e985245cd5
commit d5b9dc1317
3 changed files with 203 additions and 9 deletions
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134
misc/cgo/errors/argposition_test.go Normal file
View File

@ -0,0 +1,134 @@
// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Issue 42580: cmd/cgo: shifting identifier position in ast
package errorstest
import (
"bytes"
"fmt"
"go/ast"
"go/parser"
"go/token"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strings"
"testing"
)
type ShortPosition struct {
Line int
Column int
Visited bool
}
type IdentPositionInfo map[string][]ShortPosition
type Visitor struct {
identPosInfo IdentPositionInfo
fset *token.FileSet
t *testing.T
}
func (v *Visitor) Visit(node ast.Node) ast.Visitor {
if ident, ok := node.(*ast.Ident); ok {
if expectedPositions, ok := v.identPosInfo[ident.Name]; ok {
gotMatch := false
var errorMessage strings.Builder
for caseIndex, expectedPos := range expectedPositions {
actualPosition := v.fset.PositionFor(ident.Pos(), true)
errorOccured := false
if expectedPos.Line != actualPosition.Line {
fmt.Fprintf(&errorMessage, "wrong line number for ident %s: expected: %d got: %d\n", ident.Name, expectedPos.Line, actualPosition.Line)
errorOccured = true
}
if expectedPos.Column != actualPosition.Column {
fmt.Fprintf(&errorMessage, "wrong column number for ident %s: expected: %d got: %d\n", ident.Name, expectedPos.Column, actualPosition.Column)
errorOccured = true
}
if errorOccured {
continue
}
gotMatch = true
expectedPositions[caseIndex].Visited = true
}
if !gotMatch {
v.t.Errorf(errorMessage.String())
}
}
}
return v
}
func TestArgumentsPositions(t *testing.T) {
testdata, err := filepath.Abs("testdata")
if err != nil {
t.Fatal(err)
}
tmpPath := t.TempDir()
dir := filepath.Join(tmpPath, "src", "testpositions")
if err := os.MkdirAll(dir, 0755); err != nil {
t.Fatal(err)
}
cmd := exec.Command("go", "tool", "cgo",
"-srcdir", testdata,
"-objdir", dir,
"issue42580.go")
cmd.Stderr = new(bytes.Buffer)
err = cmd.Run()
if err != nil {
t.Fatalf("%s: %v\n%s", cmd, err, cmd.Stderr)
}
mainProcessed, err := ioutil.ReadFile(filepath.Join(dir, "issue42580.cgo1.go"))
if err != nil {
t.Fatal(err)
}
fset := token.NewFileSet()
f, err := parser.ParseFile(fset, "", mainProcessed, parser.AllErrors)
if err != nil {
fmt.Println(err)
return
}
expectation := IdentPositionInfo{
"checkedPointer": []ShortPosition{
ShortPosition{
Line: 32,
Column: 56,
},
},
"singleInnerPointerChecked": []ShortPosition{
ShortPosition{
Line: 37,
Column: 91,
},
},
"doublePointerChecked": []ShortPosition{
ShortPosition{
Line: 42,
Column: 91,
},
},
}
for _, decl := range f.Decls {
if fdecl, ok := decl.(*ast.FuncDecl); ok {
ast.Walk(&Visitor{expectation, fset, t}, fdecl.Body)
}
}
for ident, positions := range expectation {
for _, position := range positions {
if !position.Visited {
t.Errorf("Position %d:%d missed for %s ident", position.Line, position.Column, ident)
}
}
}
}

44
misc/cgo/errors/testdata/issue42580.go vendored Normal file
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@ -0,0 +1,44 @@
// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Issue 42580: cmd/cgo: shifting identifier position in ast
package cgotest
// typedef int (*intFunc) ();
//
// char* strarg = "";
//
// int func_with_char(char* arg, void* dummy)
// {return 5;}
//
// int* get_arr(char* arg, void* dummy)
// {return NULL;}
import "C"
import "unsafe"
// Test variables
var (
checkedPointer = []byte{1}
doublePointerChecked = []byte{1}
singleInnerPointerChecked = []byte{1}
)
// This test checks the positions of variable identifiers.
// Changing the positions of the test variables idents after this point will break the test.
func TestSingleArgumentCast() C.int {
retcode := C.func_with_char((*C.char)(unsafe.Pointer(&checkedPointer[0])), unsafe.Pointer(C.strarg))
return retcode
}
func TestSingleArgumentCastRecFuncAsSimpleArg() C.int {
retcode := C.func_with_char((*C.char)(unsafe.Pointer(C.get_arr((*C.char)(unsafe.Pointer(&singleInnerPointerChecked[0])), unsafe.Pointer(C.strarg)))), nil)
return retcode
}
func TestSingleArgumentCastRecFunc() C.int {
retcode := C.func_with_char((*C.char)(unsafe.Pointer(C.get_arr((*C.char)(unsafe.Pointer(&doublePointerChecked[0])), unsafe.Pointer(C.strarg)))), unsafe.Pointer(C.strarg))
return retcode
}

34
src/cmd/cgo/gcc.go
View File

@ -909,7 +909,7 @@ func (p *Package) rewriteCall(f *File, call *Call) (string, bool) {
var sbCheck bytes.Buffer
for i, param := range params {
origArg := args[i]
arg, nu := p.mangle(f, &args[i])
arg, nu := p.mangle(f, &args[i], true)
if nu {
needsUnsafe = true
}
@ -952,7 +952,7 @@ func (p *Package) rewriteCall(f *File, call *Call) (string, bool) {
sb.WriteString("return ")
}
m, nu := p.mangle(f, &call.Call.Fun)
m, nu := p.mangle(f, &call.Call.Fun, false)
if nu {
needsUnsafe = true
}
@ -1086,7 +1086,8 @@ func (p *Package) hasPointer(f *File, t ast.Expr, top bool) bool {
// rewriting calls when it finds them.
// It removes the corresponding references in f.Ref and f.Calls, so that we
// don't try to do the replacement again in rewriteRef or rewriteCall.
func (p *Package) mangle(f *File, arg *ast.Expr) (ast.Expr, bool) {
// If addPosition is true, add position info to the idents of C names in arg.
func (p *Package) mangle(f *File, arg *ast.Expr, addPosition bool) (ast.Expr, bool) {
needsUnsafe := false
f.walk(arg, ctxExpr, func(f *File, arg interface{}, context astContext) {
px, ok := arg.(*ast.Expr)
@ -1101,7 +1102,7 @@ func (p *Package) mangle(f *File, arg *ast.Expr) (ast.Expr, bool) {
for _, r := range f.Ref {
if r.Expr == px {
*px = p.rewriteName(f, r)
*px = p.rewriteName(f, r, addPosition)
r.Done = true
break
}
@ -1361,7 +1362,7 @@ func (p *Package) rewriteRef(f *File) {
}
}
expr := p.rewriteName(f, r)
expr := p.rewriteName(f, r, false)
if *godefs {
// Substitute definition for mangled type name.
@ -1424,8 +1425,23 @@ func (p *Package) rewriteRef(f *File) {
}
// rewriteName returns the expression used to rewrite a reference.
func (p *Package) rewriteName(f *File, r *Ref) ast.Expr {
var expr ast.Expr = ast.NewIdent(r.Name.Mangle) // default
// If addPosition is true, add position info in the ident name.
func (p *Package) rewriteName(f *File, r *Ref, addPosition bool) ast.Expr {
getNewIdent := ast.NewIdent
if addPosition {
getNewIdent = func(newName string) *ast.Ident {
mangledIdent := ast.NewIdent(newName)
if len(newName) == len(r.Name.Go) {
return mangledIdent
}
p := fset.Position((*r.Expr).End())
if p.Column == 0 {
return mangledIdent
}
return ast.NewIdent(fmt.Sprintf("%s /*line :%d:%d*/", newName, p.Line, p.Column))
}
}
var expr ast.Expr = getNewIdent(r.Name.Mangle) // default
switch r.Context {
case ctxCall, ctxCall2:
if r.Name.Kind != "func" {
@ -1453,7 +1469,7 @@ func (p *Package) rewriteName(f *File, r *Ref) ast.Expr {
n.Mangle = "_C2func_" + n.Go
f.Name["2"+r.Name.Go] = n
}
expr = ast.NewIdent(n.Mangle)
expr = getNewIdent(n.Mangle)
r.Name = n
break
}
@ -1484,7 +1500,7 @@ func (p *Package) rewriteName(f *File, r *Ref) ast.Expr {
// issue 7757.
expr = &ast.CallExpr{
Fun: &ast.Ident{NamePos: (*r.Expr).Pos(), Name: "_Cgo_ptr"},
Args: []ast.Expr{ast.NewIdent(name.Mangle)},
Args: []ast.Expr{getNewIdent(name.Mangle)},
}
case "type":
// Okay - might be new(T)