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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"
"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 := os.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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