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// Copyright 2022 The ChromiumOS Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package main
import (
"bufio"
"bytes"
"fmt"
"os"
"path/filepath"
"strings"
)
type useIWYUMode int
const (
iwyuModeNone useIWYUMode = iota
iwyuModeAll
iwyuModeError
)
var srcFileSuffixes = []string{
".c",
".cc",
".cpp",
".C",
".cxx",
".c++",
}
func findWithIWYUFlag(args []builderArg) (string, []builderArg) {
for i := range args {
if args[i].value == "--with-iwyu" {
args = append(args[:i], args[i+1:]...)
return "1", args
}
}
return "", args
}
func processIWYUFlags(builder *commandBuilder) (cSrcFile string, iwyuFlags []string, mode useIWYUMode) {
builder.transformArgs(func(arg builderArg) string {
const prefix = "-iwyu-flag="
if !strings.HasPrefix(arg.value, prefix) {
return arg.value
}
iwyuFlags = append(iwyuFlags, arg.value[len(prefix):])
return ""
})
cSrcFile = ""
lastArg := ""
for _, arg := range builder.args {
if lastArg != "-o" {
for _, suffix := range srcFileSuffixes {
if strings.HasSuffix(arg.value, suffix) {
cSrcFile = arg.value
break
}
}
}
lastArg = arg.value
}
if cSrcFile == "" {
return "", iwyuFlags, iwyuModeNone
}
withIWYU, _ := builder.env.getenv("WITH_IWYU")
if withIWYU == "" {
withIWYU, builder.args = findWithIWYUFlag(builder.args)
if withIWYU == "" {
return cSrcFile, iwyuFlags, iwyuModeNone
}
}
if withIWYU != "1" {
return cSrcFile, iwyuFlags, iwyuModeError
}
return cSrcFile, iwyuFlags, iwyuModeAll
}
func calcIWYUInvocation(env env, clangCmd *command, cSrcFile string, iwyuFlags ...string) (*command, error) {
resourceDir, err := getClangResourceDir(env, clangCmd.Path)
if err != nil {
return nil, err
}
iwyuPath := filepath.Join(filepath.Dir(clangCmd.Path), "include-what-you-use")
args := append([]string{}, iwyuFlags...)
args = append(args, "-resource-dir="+resourceDir)
args = append(args, clangCmd.Args...)
for i := 0; i < len(args); i++ {
for j := 0; j < len(srcFileSuffixes); j++ {
if strings.HasSuffix(args[i], srcFileSuffixes[j]) {
args = append(args[:i], args[i+1:]...)
break
}
}
}
args = append(args, cSrcFile)
return &command{
Path: iwyuPath,
Args: args,
EnvUpdates: clangCmd.EnvUpdates,
}, nil
}
func runIWYU(env env, clangCmd *command, cSrcFile string, extraIWYUFlags []string) error {
extraIWYUFlags = append(extraIWYUFlags, "-Xiwyu", "--mapping_file=/usr/share/include-what-you-use/libcxx.imp", "-Xiwyu", "--no_fwd_decls")
iwyuCmd, err := calcIWYUInvocation(env, clangCmd, cSrcFile, extraIWYUFlags...)
if err != nil {
return fmt.Errorf("calculating include-what-you-use invocation: %v", err)
}
// Note: We pass nil as stdin as we checked before that the compiler
// was invoked with a source file argument.
var stderr bytes.Buffer
stderrWriter := bufio.NewWriter(&stderr)
exitCode, err := wrapSubprocessErrorWithSourceLoc(iwyuCmd,
env.run(iwyuCmd, nil, nil, stderrWriter))
stderrMessage := stderr.String()
fmt.Fprintln(env.stderr(), stderrMessage)
if err == nil && exitCode != 0 {
// Note: We continue on purpose when include-what-you-use fails
// to maintain compatibility with the previous wrapper.
fmt.Fprintln(env.stderr(), "include-what-you-use failed")
}
iwyuDir := filepath.Join(getCompilerArtifactsDir(env), "linting-output", "iwyu")
if err := os.MkdirAll(iwyuDir, 0777); err != nil {
return fmt.Errorf("creating fixes directory at %q: %v", iwyuDir, err)
}
f, err := os.CreateTemp(iwyuDir, "*.out")
if err != nil {
return fmt.Errorf("making output file for iwyu: %v", err)
}
writer := bufio.NewWriter(f)
if _, err := writer.WriteString(stderrMessage); err != nil {
return fmt.Errorf("writing output file for iwyu: %v", err)
}
if err := writer.Flush(); err != nil {
return fmt.Errorf("flushing output file buffer for iwyu: %v", err)
}
if err := f.Close(); err != nil {
return fmt.Errorf("finalizing output file for iwyu: %v", err)
}
return err
}
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