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- // 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)
- }
- }
- }
- }
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