kythe.io@v0.0.68-0.20240422202219-7225dbc01741/kythe/go/util/tools/write_extra_action/write_extra_action.go (about)

     1  /*
     2   * Copyright 2019 The Kythe Authors. All rights reserved.
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *   http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  // Binary write_extra_action reads a textproto ExtraActionInfo, wire-encodes it,
    18  // and writes it to another file.
    19  //
    20  // Usage:
    21  //
    22  //	write_extra_action <text_proto_file> <output_path>
    23  package main
    24  
    25  import (
    26  	"context"
    27  	"flag"
    28  	"fmt"
    29  	"io/ioutil"
    30  	"os"
    31  	"path/filepath"
    32  
    33  	"kythe.io/kythe/go/platform/vfs"
    34  	"kythe.io/kythe/go/util/log"
    35  
    36  	"google.golang.org/protobuf/encoding/prototext"
    37  	"google.golang.org/protobuf/proto"
    38  
    39  	xapb "kythe.io/third_party/bazel/extra_actions_base_go_proto"
    40  )
    41  
    42  func main() {
    43  	flag.Parse()
    44  
    45  	if flag.NArg() < 2 || (flag.NArg() > 2 && flag.Arg(2) != "--") {
    46  		fmt.Printf("usage: %s <text_proto_file> <output_path> [-- <arg>...]\n", filepath.Base(os.Args[0]))
    47  		os.Exit(2)
    48  	}
    49  
    50  	ctx := context.Background()
    51  	textFile := flag.Arg(0)
    52  	outFile := flag.Arg(1)
    53  
    54  	in, err := vfs.Open(ctx, textFile)
    55  	if err != nil {
    56  		log.Fatal(err)
    57  	}
    58  
    59  	txt, err := ioutil.ReadAll(in)
    60  	in.Close()
    61  	if err != nil {
    62  		log.Fatal(err)
    63  	}
    64  
    65  	var xa xapb.ExtraActionInfo
    66  	if err := prototext.Unmarshal(txt, &xa); err != nil {
    67  		log.Fatal(err)
    68  	}
    69  
    70  	// C++ command line arguments are not available in Starlark, so the extension cannot
    71  	// be completed populated there and must delegate to an external binary.
    72  	if cc := proto.GetExtension(&xa, xapb.E_CppCompileInfo_CppCompileInfo).(*xapb.CppCompileInfo); cc != nil {
    73  		populateCppCompileInfo(cc)
    74  	}
    75  
    76  	rec, err := proto.Marshal(&xa)
    77  	if err != nil {
    78  		log.Fatal(err)
    79  	}
    80  
    81  	f, err := vfs.Create(ctx, outFile)
    82  	if err != nil {
    83  		log.Fatal(err)
    84  	} else if _, err := f.Write(rec); err != nil {
    85  		log.Fatal(err)
    86  	} else if err := f.Close(); err != nil {
    87  		log.Fatal(err)
    88  	}
    89  }
    90  
    91  func populateCppCompileInfo(cc *xapb.CppCompileInfo) {
    92  	if flag.NArg() <= 3 || flag.Arg(2) != "--" {
    93  		return // No additional flags, end early.
    94  	}
    95  	cc.Tool = proto.String(flag.Arg(3))
    96  	cc.CompilerOption = flag.Args()[4:flag.NArg()]
    97  	for i, arg := range cc.CompilerOption {
    98  		if arg == "-c" && i+1 < len(cc.CompilerOption) {
    99  			cc.SourceFile = proto.String(cc.CompilerOption[i+1])
   100  			break
   101  		}
   102  	}
   103  }