1 //===--- Compiler.cpp --------------------------------------------*- C++-*-===//
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 "Compiler.h"
10 #include "Logger.h"
11 #include "clang/Basic/TargetInfo.h"
12 #include "clang/Lex/PreprocessorOptions.h"
13 #include "clang/Serialization/PCHContainerOperations.h"
14 #include "llvm/Support/Format.h"
15 #include "llvm/Support/FormatVariadic.h"
16 
17 namespace clang {
18 namespace clangd {
19 
20 void IgnoreDiagnostics::log(DiagnosticsEngine::Level DiagLevel,
21                             const clang::Diagnostic &Info) {
22   // FIXME: format lazily, in case vlog is off.
23   llvm::SmallString<64> Message;
24   Info.FormatDiagnostic(Message);
25 
26   llvm::SmallString<64> Location;
27   if (Info.hasSourceManager() && Info.getLocation().isValid()) {
28     auto &SourceMgr = Info.getSourceManager();
29     auto Loc = SourceMgr.getFileLoc(Info.getLocation());
30     llvm::raw_svector_ostream OS(Location);
31     Loc.print(OS, SourceMgr);
32     OS << ":";
33   }
34 
35   clangd::vlog("Ignored diagnostic. {0}{1}", Location, Message);
36 }
37 
38 void IgnoreDiagnostics::HandleDiagnostic(DiagnosticsEngine::Level DiagLevel,
39                                          const clang::Diagnostic &Info) {
40   IgnoreDiagnostics::log(DiagLevel, Info);
41 }
42 
43 std::unique_ptr<CompilerInvocation>
44 buildCompilerInvocation(const ParseInputs &Inputs) {
45   std::vector<const char *> ArgStrs;
46   for (const auto &S : Inputs.CompileCommand.CommandLine)
47     ArgStrs.push_back(S.c_str());
48 
49   if (Inputs.FS->setCurrentWorkingDirectory(Inputs.CompileCommand.Directory)) {
50     log("Couldn't set working directory when creating compiler invocation.");
51     // We proceed anyway, our lit-tests rely on results for non-existing working
52     // dirs.
53   }
54 
55   // FIXME(ibiryukov): store diagnostics from CommandLine when we start
56   // reporting them.
57   IgnoreDiagnostics IgnoreDiagnostics;
58   llvm::IntrusiveRefCntPtr<DiagnosticsEngine> CommandLineDiagsEngine =
59       CompilerInstance::createDiagnostics(new DiagnosticOptions,
60                                           &IgnoreDiagnostics, false);
61   std::unique_ptr<CompilerInvocation> CI = createInvocationFromCommandLine(
62       ArgStrs, CommandLineDiagsEngine, Inputs.FS);
63   if (!CI)
64     return nullptr;
65   // createInvocationFromCommandLine sets DisableFree.
66   CI->getFrontendOpts().DisableFree = false;
67   CI->getLangOpts()->CommentOpts.ParseAllComments = true;
68   return CI;
69 }
70 
71 std::unique_ptr<CompilerInstance>
72 prepareCompilerInstance(std::unique_ptr<clang::CompilerInvocation> CI,
73                         const PrecompiledPreamble *Preamble,
74                         std::unique_ptr<llvm::MemoryBuffer> Buffer,
75                         llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS,
76                         DiagnosticConsumer &DiagsClient) {
77   assert(VFS && "VFS is null");
78   assert(!CI->getPreprocessorOpts().RetainRemappedFileBuffers &&
79          "Setting RetainRemappedFileBuffers to true will cause a memory leak "
80          "of ContentsBuffer");
81 
82   // NOTE: we use Buffer.get() when adding remapped files, so we have to make
83   // sure it will be released if no error is emitted.
84   if (Preamble) {
85     Preamble->OverridePreamble(*CI, VFS, Buffer.get());
86   } else {
87     CI->getPreprocessorOpts().addRemappedFile(
88         CI->getFrontendOpts().Inputs[0].getFile(), Buffer.get());
89   }
90 
91   auto Clang = llvm::make_unique<CompilerInstance>(
92       std::make_shared<PCHContainerOperations>());
93   Clang->setInvocation(std::move(CI));
94   Clang->createDiagnostics(&DiagsClient, false);
95 
96   if (auto VFSWithRemapping = createVFSFromCompilerInvocation(
97           Clang->getInvocation(), Clang->getDiagnostics(), VFS))
98     VFS = VFSWithRemapping;
99   Clang->createFileManager(VFS);
100 
101   Clang->setTarget(TargetInfo::CreateTargetInfo(
102       Clang->getDiagnostics(), Clang->getInvocation().TargetOpts));
103   if (!Clang->hasTarget())
104     return nullptr;
105 
106   // RemappedFileBuffers will handle the lifetime of the Buffer pointer,
107   // release it.
108   Buffer.release();
109   return Clang;
110 }
111 
112 } // namespace clangd
113 } // namespace clang
114