1 //===--- Utils.h - Misc utilities for the front-end -------------*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This header contains miscellaneous utilities for various front-end actions.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #ifndef LLVM_CLANG_FRONTEND_UTILS_H
15 #define LLVM_CLANG_FRONTEND_UTILS_H
16
17 #include "clang/Basic/Diagnostic.h"
18 #include "clang/Basic/VirtualFileSystem.h"
19 #include "llvm/ADT/IntrusiveRefCntPtr.h"
20 #include "llvm/ADT/StringRef.h"
21 #include "llvm/ADT/StringSet.h"
22 #include "llvm/Option/OptSpecifier.h"
23
24 namespace llvm {
25 class raw_fd_ostream;
26 class Triple;
27
28 namespace opt {
29 class ArgList;
30 }
31 }
32
33 namespace clang {
34 class ASTConsumer;
35 class ASTReader;
36 class CompilerInstance;
37 class CompilerInvocation;
38 class Decl;
39 class DependencyOutputOptions;
40 class DiagnosticsEngine;
41 class DiagnosticOptions;
42 class ExternalSemaSource;
43 class FileManager;
44 class HeaderSearch;
45 class HeaderSearchOptions;
46 class IdentifierTable;
47 class LangOptions;
48 class PCHContainerReader;
49 class Preprocessor;
50 class PreprocessorOptions;
51 class PreprocessorOutputOptions;
52 class SourceManager;
53 class Stmt;
54 class TargetInfo;
55 class FrontendOptions;
56
57 /// Apply the header search options to get given HeaderSearch object.
58 void ApplyHeaderSearchOptions(HeaderSearch &HS,
59 const HeaderSearchOptions &HSOpts,
60 const LangOptions &Lang,
61 const llvm::Triple &triple);
62
63 /// InitializePreprocessor - Initialize the preprocessor getting it and the
64 /// environment ready to process a single file.
65 void InitializePreprocessor(Preprocessor &PP, const PreprocessorOptions &PPOpts,
66 const PCHContainerReader &PCHContainerRdr,
67 const FrontendOptions &FEOpts);
68
69 /// DoPrintPreprocessedInput - Implement -E mode.
70 void DoPrintPreprocessedInput(Preprocessor &PP, raw_ostream* OS,
71 const PreprocessorOutputOptions &Opts);
72
73 /// An interface for collecting the dependencies of a compilation. Users should
74 /// use \c attachToPreprocessor and \c attachToASTReader to get all of the
75 /// dependencies.
76 // FIXME: Migrate DependencyFileGen, DependencyGraphGen, ModuleDepCollectory to
77 // use this interface.
78 class DependencyCollector {
79 public:
80 void attachToPreprocessor(Preprocessor &PP);
81 void attachToASTReader(ASTReader &R);
getDependencies()82 llvm::ArrayRef<std::string> getDependencies() const { return Dependencies; }
83
84 /// Called when a new file is seen. Return true if \p Filename should be added
85 /// to the list of dependencies.
86 ///
87 /// The default implementation ignores <built-in> and system files.
88 virtual bool sawDependency(StringRef Filename, bool FromModule,
89 bool IsSystem, bool IsModuleFile, bool IsMissing);
90 /// Called when the end of the main file is reached.
finishedMainFile()91 virtual void finishedMainFile() { }
92 /// Return true if system files should be passed to sawDependency().
needSystemDependencies()93 virtual bool needSystemDependencies() { return false; }
94 virtual ~DependencyCollector();
95
96 public: // implementation detail
97 /// Add a dependency \p Filename if it has not been seen before and
98 /// sawDependency() returns true.
99 void maybeAddDependency(StringRef Filename, bool FromModule, bool IsSystem,
100 bool IsModuleFile, bool IsMissing);
101 private:
102 llvm::StringSet<> Seen;
103 std::vector<std::string> Dependencies;
104 };
105
106 /// Builds a depdenency file when attached to a Preprocessor (for includes) and
107 /// ASTReader (for module imports), and writes it out at the end of processing
108 /// a source file. Users should attach to the ast reader whenever a module is
109 /// loaded.
110 class DependencyFileGenerator {
111 void *Impl; // Opaque implementation
112 DependencyFileGenerator(void *Impl);
113 public:
114 static DependencyFileGenerator *CreateAndAttachToPreprocessor(
115 Preprocessor &PP, const DependencyOutputOptions &Opts);
116 void AttachToASTReader(ASTReader &R);
117 };
118
119 /// Collects the dependencies for imported modules into a directory. Users
120 /// should attach to the AST reader whenever a module is loaded.
121 class ModuleDependencyCollector {
122 std::string DestDir;
123 bool HasErrors;
124 llvm::StringSet<> Seen;
125 vfs::YAMLVFSWriter VFSWriter;
126
127 public:
getDest()128 StringRef getDest() { return DestDir; }
insertSeen(StringRef Filename)129 bool insertSeen(StringRef Filename) { return Seen.insert(Filename).second; }
setHasErrors()130 void setHasErrors() { HasErrors = true; }
addFileMapping(StringRef VPath,StringRef RPath)131 void addFileMapping(StringRef VPath, StringRef RPath) {
132 VFSWriter.addFileMapping(VPath, RPath);
133 }
134
135 void attachToASTReader(ASTReader &R);
136 void writeFileMap();
hasErrors()137 bool hasErrors() { return HasErrors; }
ModuleDependencyCollector(std::string DestDir)138 ModuleDependencyCollector(std::string DestDir)
139 : DestDir(DestDir), HasErrors(false) {}
~ModuleDependencyCollector()140 ~ModuleDependencyCollector() { writeFileMap(); }
141 };
142
143 /// AttachDependencyGraphGen - Create a dependency graph generator, and attach
144 /// it to the given preprocessor.
145 void AttachDependencyGraphGen(Preprocessor &PP, StringRef OutputFile,
146 StringRef SysRoot);
147
148 /// AttachHeaderIncludeGen - Create a header include list generator, and attach
149 /// it to the given preprocessor.
150 ///
151 /// \param ExtraHeaders - If not empty, will write the header filenames, just
152 /// like they were included during a regular preprocessing. Useful for
153 /// implicit include dependencies, like sanitizer blacklists.
154 /// \param ShowAllHeaders - If true, show all header information instead of just
155 /// headers following the predefines buffer. This is useful for making sure
156 /// includes mentioned on the command line are also reported, but differs from
157 /// the default behavior used by -H.
158 /// \param OutputPath - If non-empty, a path to write the header include
159 /// information to, instead of writing to stderr.
160 /// \param ShowDepth - Whether to indent to show the nesting of the includes.
161 /// \param MSStyle - Whether to print in cl.exe /showIncludes style.
162 void AttachHeaderIncludeGen(Preprocessor &PP,
163 const std::vector<std::string> &ExtraHeaders,
164 bool ShowAllHeaders = false,
165 StringRef OutputPath = "",
166 bool ShowDepth = true, bool MSStyle = false);
167
168 /// Cache tokens for use with PCH. Note that this requires a seekable stream.
169 void CacheTokens(Preprocessor &PP, raw_pwrite_stream *OS);
170
171 /// The ChainedIncludesSource class converts headers to chained PCHs in
172 /// memory, mainly for testing.
173 IntrusiveRefCntPtr<ExternalSemaSource>
174 createChainedIncludesSource(CompilerInstance &CI,
175 IntrusiveRefCntPtr<ExternalSemaSource> &Reader);
176
177 /// createInvocationFromCommandLine - Construct a compiler invocation object for
178 /// a command line argument vector.
179 ///
180 /// \return A CompilerInvocation, or 0 if none was built for the given
181 /// argument vector.
182 CompilerInvocation *
183 createInvocationFromCommandLine(ArrayRef<const char *> Args,
184 IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
185 IntrusiveRefCntPtr<DiagnosticsEngine>());
186
187 /// Return the value of the last argument as an integer, or a default. If Diags
188 /// is non-null, emits an error if the argument is given, but non-integral.
189 int getLastArgIntValue(const llvm::opt::ArgList &Args,
190 llvm::opt::OptSpecifier Id, int Default,
191 DiagnosticsEngine *Diags = nullptr);
192
getLastArgIntValue(const llvm::opt::ArgList & Args,llvm::opt::OptSpecifier Id,int Default,DiagnosticsEngine & Diags)193 inline int getLastArgIntValue(const llvm::opt::ArgList &Args,
194 llvm::opt::OptSpecifier Id, int Default,
195 DiagnosticsEngine &Diags) {
196 return getLastArgIntValue(Args, Id, Default, &Diags);
197 }
198
199 uint64_t getLastArgUInt64Value(const llvm::opt::ArgList &Args,
200 llvm::opt::OptSpecifier Id, uint64_t Default,
201 DiagnosticsEngine *Diags = nullptr);
202
getLastArgUInt64Value(const llvm::opt::ArgList & Args,llvm::opt::OptSpecifier Id,uint64_t Default,DiagnosticsEngine & Diags)203 inline uint64_t getLastArgUInt64Value(const llvm::opt::ArgList &Args,
204 llvm::opt::OptSpecifier Id,
205 uint64_t Default,
206 DiagnosticsEngine &Diags) {
207 return getLastArgUInt64Value(Args, Id, Default, &Diags);
208 }
209
210 // When Clang->getFrontendOpts().DisableFree is set we don't delete some of the
211 // global objects, but we don't want LeakDetectors to complain, so we bury them
212 // in a globally visible array.
213 void BuryPointer(const void *Ptr);
BuryPointer(std::unique_ptr<T> Ptr)214 template <typename T> void BuryPointer(std::unique_ptr<T> Ptr) {
215 BuryPointer(Ptr.release());
216 }
217
218 } // end namespace clang
219
220 #endif
221