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                         clang::DiagnosticConsumer &D) {
46   std::vector<const char *> ArgStrs;
47   for (const auto &S : Inputs.CompileCommand.CommandLine)
48     ArgStrs.push_back(S.c_str());
49 
50   if (Inputs.FS->setCurrentWorkingDirectory(Inputs.CompileCommand.Directory)) {
51     log("Couldn't set working directory when creating compiler invocation.");
52     // We proceed anyway, our lit-tests rely on results for non-existing working
53     // dirs.
54   }
55 
56   llvm::IntrusiveRefCntPtr<DiagnosticsEngine> CommandLineDiagsEngine =
57       CompilerInstance::createDiagnostics(new DiagnosticOptions, &D, false);
58   std::unique_ptr<CompilerInvocation> CI = createInvocationFromCommandLine(
59       ArgStrs, CommandLineDiagsEngine, Inputs.FS,
60       /*ShouldRecoverOnErrors=*/true);
61   if (!CI)
62     return nullptr;
63   // createInvocationFromCommandLine sets DisableFree.
64   CI->getFrontendOpts().DisableFree = false;
65   CI->getLangOpts()->CommentOpts.ParseAllComments = true;
66   CI->getLangOpts()->RetainCommentsFromSystemHeaders = true;
67   return CI;
68 }
69 
70 std::unique_ptr<CompilerInstance>
71 prepareCompilerInstance(std::unique_ptr<clang::CompilerInvocation> CI,
72                         const PrecompiledPreamble *Preamble,
73                         std::unique_ptr<llvm::MemoryBuffer> Buffer,
74                         llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS,
75                         DiagnosticConsumer &DiagsClient) {
76   assert(VFS && "VFS is null");
77   assert(!CI->getPreprocessorOpts().RetainRemappedFileBuffers &&
78          "Setting RetainRemappedFileBuffers to true will cause a memory leak "
79          "of ContentsBuffer");
80 
81   // NOTE: we use Buffer.get() when adding remapped files, so we have to make
82   // sure it will be released if no error is emitted.
83   if (Preamble) {
84     Preamble->OverridePreamble(*CI, VFS, Buffer.get());
85   } else {
86     CI->getPreprocessorOpts().addRemappedFile(
87         CI->getFrontendOpts().Inputs[0].getFile(), Buffer.get());
88   }
89 
90   auto Clang = std::make_unique<CompilerInstance>(
91       std::make_shared<PCHContainerOperations>());
92   Clang->setInvocation(std::move(CI));
93   Clang->createDiagnostics(&DiagsClient, false);
94 
95   if (auto VFSWithRemapping = createVFSFromCompilerInvocation(
96           Clang->getInvocation(), Clang->getDiagnostics(), VFS))
97     VFS = VFSWithRemapping;
98   Clang->createFileManager(VFS);
99 
100   Clang->setTarget(TargetInfo::CreateTargetInfo(
101       Clang->getDiagnostics(), Clang->getInvocation().TargetOpts));
102   if (!Clang->hasTarget())
103     return nullptr;
104 
105   // RemappedFileBuffers will handle the lifetime of the Buffer pointer,
106   // release it.
107   Buffer.release();
108   return Clang;
109 }
110 
111 } // namespace clangd
112 } // namespace clang
113