1 //===- ExpandResponseFileCompilationDataBase.cpp --------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "clang/Tooling/CompilationDatabase.h"
10 #include "llvm/ADT/StringRef.h"
11 #include "llvm/ADT/Triple.h"
12 #include "llvm/Support/CommandLine.h"
13 #include "llvm/Support/ConvertUTF.h"
14 #include "llvm/Support/ErrorOr.h"
15 #include "llvm/Support/Host.h"
16 #include "llvm/Support/MemoryBuffer.h"
17 #include "llvm/Support/Path.h"
18 #include "llvm/Support/StringSaver.h"
19 
20 namespace clang {
21 namespace tooling {
22 namespace {
23 
24 class ExpandResponseFilesDatabase : public CompilationDatabase {
25 public:
26   ExpandResponseFilesDatabase(
27       std::unique_ptr<CompilationDatabase> Base,
28       llvm::cl::TokenizerCallback Tokenizer,
29       llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS)
30       : Base(std::move(Base)), Tokenizer(Tokenizer), FS(std::move(FS)) {
31     assert(this->Base != nullptr);
32     assert(this->Tokenizer != nullptr);
33     assert(this->FS != nullptr);
34   }
35 
36   std::vector<std::string> getAllFiles() const override {
37     return Base->getAllFiles();
38   }
39 
40   std::vector<CompileCommand>
41   getCompileCommands(StringRef FilePath) const override {
42     return expand(Base->getCompileCommands(FilePath));
43   }
44 
45   std::vector<CompileCommand> getAllCompileCommands() const override {
46     return expand(Base->getAllCompileCommands());
47   }
48 
49 private:
50   std::vector<CompileCommand> expand(std::vector<CompileCommand> Cmds) const {
51     for (auto &Cmd : Cmds) {
52       bool SeenRSPFile = false;
53       llvm::SmallVector<const char *, 20> Argv;
54       Argv.reserve(Cmd.CommandLine.size());
55       for (auto &Arg : Cmd.CommandLine) {
56         Argv.push_back(Arg.c_str());
57         if (!Arg.empty())
58           SeenRSPFile |= Arg.front() == '@';
59       }
60       if (!SeenRSPFile)
61         continue;
62       llvm::BumpPtrAllocator Alloc;
63       llvm::cl::ExpansionContext ECtx(Alloc, Tokenizer);
64       llvm::Error Err = ECtx.setVFS(FS.get())
65                             .setCurrentDir(Cmd.Directory)
66                             .expandResponseFiles(Argv);
67       if (Err)
68         llvm::errs() << Err;
69       // Don't assign directly, Argv aliases CommandLine.
70       std::vector<std::string> ExpandedArgv(Argv.begin(), Argv.end());
71       Cmd.CommandLine = std::move(ExpandedArgv);
72     }
73     return Cmds;
74   }
75 
76 private:
77   std::unique_ptr<CompilationDatabase> Base;
78   llvm::cl::TokenizerCallback Tokenizer;
79   llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS;
80 };
81 
82 } // namespace
83 
84 std::unique_ptr<CompilationDatabase>
85 expandResponseFiles(std::unique_ptr<CompilationDatabase> Base,
86                     llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS) {
87   auto Tokenizer = llvm::Triple(llvm::sys::getProcessTriple()).isOSWindows()
88                        ? llvm::cl::TokenizeWindowsCommandLine
89                        : llvm::cl::TokenizeGNUCommandLine;
90   return std::make_unique<ExpandResponseFilesDatabase>(
91       std::move(Base), Tokenizer, std::move(FS));
92 }
93 
94 } // namespace tooling
95 } // namespace clang
96