1 //===- HeaderSearchOptions.h ------------------------------------*- 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 #ifndef LLVM_CLANG_LEX_HEADERSEARCHOPTIONS_H
10 #define LLVM_CLANG_LEX_HEADERSEARCHOPTIONS_H
11
12 #include "clang/Basic/LLVM.h"
13 #include "llvm/ADT/CachedHashString.h"
14 #include "llvm/ADT/Hashing.h"
15 #include "llvm/ADT/SetVector.h"
16 #include "llvm/ADT/StringRef.h"
17 #include <cstdint>
18 #include <string>
19 #include <vector>
20 #include <map>
21
22 namespace clang {
23
24 namespace frontend {
25
26 /// IncludeDirGroup - Identifies the group an include Entry belongs to,
27 /// representing its relative positive in the search list.
28 /// \#include directives whose paths are enclosed by string quotes ("")
29 /// start searching at the Quoted group (specified by '-iquote'),
30 /// then search the Angled group, then the System group, etc.
31 enum IncludeDirGroup {
32 /// '\#include ""' paths, added by 'gcc -iquote'.
33 Quoted = 0,
34
35 /// Paths for '\#include <>' added by '-I'.
36 Angled,
37
38 /// Like Angled, but marks header maps used when building frameworks.
39 IndexHeaderMap,
40
41 /// Like Angled, but marks system directories.
42 System,
43
44 /// Like System, but headers are implicitly wrapped in extern "C".
45 ExternCSystem,
46
47 /// Like System, but only used for C.
48 CSystem,
49
50 /// Like System, but only used for C++.
51 CXXSystem,
52
53 /// Like System, but only used for ObjC.
54 ObjCSystem,
55
56 /// Like System, but only used for ObjC++.
57 ObjCXXSystem,
58
59 /// Like System, but searched after the system directories.
60 After
61 };
62
63 } // namespace frontend
64
65 /// HeaderSearchOptions - Helper class for storing options related to the
66 /// initialization of the HeaderSearch object.
67 class HeaderSearchOptions {
68 public:
69 struct Entry {
70 std::string Path;
71 frontend::IncludeDirGroup Group;
72 unsigned IsFramework : 1;
73
74 /// IgnoreSysRoot - This is false if an absolute path should be treated
75 /// relative to the sysroot, or true if it should always be the absolute
76 /// path.
77 unsigned IgnoreSysRoot : 1;
78
EntryEntry79 Entry(StringRef path, frontend::IncludeDirGroup group, bool isFramework,
80 bool ignoreSysRoot)
81 : Path(path), Group(group), IsFramework(isFramework),
82 IgnoreSysRoot(ignoreSysRoot) {}
83 };
84
85 struct SystemHeaderPrefix {
86 /// A prefix to be matched against paths in \#include directives.
87 std::string Prefix;
88
89 /// True if paths beginning with this prefix should be treated as system
90 /// headers.
91 bool IsSystemHeader;
92
SystemHeaderPrefixSystemHeaderPrefix93 SystemHeaderPrefix(StringRef Prefix, bool IsSystemHeader)
94 : Prefix(Prefix), IsSystemHeader(IsSystemHeader) {}
95 };
96
97 /// If non-empty, the directory to use as a "virtual system root" for include
98 /// paths.
99 std::string Sysroot;
100
101 /// User specified include entries.
102 std::vector<Entry> UserEntries;
103
104 /// User-specified system header prefixes.
105 std::vector<SystemHeaderPrefix> SystemHeaderPrefixes;
106
107 /// The directory which holds the compiler resource files (builtin includes,
108 /// etc.).
109 std::string ResourceDir;
110
111 /// The directory used for the module cache.
112 std::string ModuleCachePath;
113
114 /// The directory used for a user build.
115 std::string ModuleUserBuildPath;
116
117 /// The mapping of module names to prebuilt module files.
118 std::map<std::string, std::string, std::less<>> PrebuiltModuleFiles;
119
120 /// The directories used to load prebuilt module files.
121 std::vector<std::string> PrebuiltModulePaths;
122
123 /// The module/pch container format.
124 std::string ModuleFormat;
125
126 /// Whether we should disable the use of the hash string within the
127 /// module cache.
128 ///
129 /// Note: Only used for testing!
130 unsigned DisableModuleHash : 1;
131
132 /// Implicit module maps. This option is enabld by default when
133 /// modules is enabled.
134 unsigned ImplicitModuleMaps : 1;
135
136 /// Set the 'home directory' of a module map file to the current
137 /// working directory (or the home directory of the module map file that
138 /// contained the 'extern module' directive importing this module map file
139 /// if any) rather than the directory containing the module map file.
140 //
141 /// The home directory is where we look for files named in the module map
142 /// file.
143 unsigned ModuleMapFileHomeIsCwd : 1;
144
145 /// Also search for prebuilt implicit modules in the prebuilt module cache
146 /// path.
147 unsigned EnablePrebuiltImplicitModules : 1;
148
149 /// The interval (in seconds) between pruning operations.
150 ///
151 /// This operation is expensive, because it requires Clang to walk through
152 /// the directory structure of the module cache, stat()'ing and removing
153 /// files.
154 ///
155 /// The default value is large, e.g., the operation runs once a week.
156 unsigned ModuleCachePruneInterval = 7 * 24 * 60 * 60;
157
158 /// The time (in seconds) after which an unused module file will be
159 /// considered unused and will, therefore, be pruned.
160 ///
161 /// When the module cache is pruned, any module file that has not been
162 /// accessed in this many seconds will be removed. The default value is
163 /// large, e.g., a month, to avoid forcing infrequently-used modules to be
164 /// regenerated often.
165 unsigned ModuleCachePruneAfter = 31 * 24 * 60 * 60;
166
167 /// The time in seconds when the build session started.
168 ///
169 /// This time is used by other optimizations in header search and module
170 /// loading.
171 uint64_t BuildSessionTimestamp = 0;
172
173 /// The set of macro names that should be ignored for the purposes
174 /// of computing the module hash.
175 llvm::SmallSetVector<llvm::CachedHashString, 16> ModulesIgnoreMacros;
176
177 /// The set of user-provided virtual filesystem overlay files.
178 std::vector<std::string> VFSOverlayFiles;
179
180 /// Include the compiler builtin includes.
181 unsigned UseBuiltinIncludes : 1;
182
183 /// Include the system standard include search directories.
184 unsigned UseStandardSystemIncludes : 1;
185
186 /// Include the system standard C++ library include search directories.
187 unsigned UseStandardCXXIncludes : 1;
188
189 /// Use libc++ instead of the default libstdc++.
190 unsigned UseLibcxx : 1;
191
192 /// Whether header search information should be output as for -v.
193 unsigned Verbose : 1;
194
195 /// If true, skip verifying input files used by modules if the
196 /// module was already verified during this build session (see
197 /// \c BuildSessionTimestamp).
198 unsigned ModulesValidateOncePerBuildSession : 1;
199
200 /// Whether to validate system input files when a module is loaded.
201 unsigned ModulesValidateSystemHeaders : 1;
202
203 // Whether the content of input files should be hashed and used to
204 // validate consistency.
205 unsigned ValidateASTInputFilesContent : 1;
206
207 /// Whether the module includes debug information (-gmodules).
208 unsigned UseDebugInfo : 1;
209
210 unsigned ModulesValidateDiagnosticOptions : 1;
211
212 unsigned ModulesHashContent : 1;
213
214 /// Whether we should include all things that could impact the module in the
215 /// hash.
216 ///
217 /// This includes things like the full header search path, and enabled
218 /// diagnostics.
219 unsigned ModulesStrictContextHash : 1;
220
221 HeaderSearchOptions(StringRef _Sysroot = "/")
Sysroot(_Sysroot)222 : Sysroot(_Sysroot), ModuleFormat("raw"), DisableModuleHash(false),
223 ImplicitModuleMaps(false), ModuleMapFileHomeIsCwd(false),
224 EnablePrebuiltImplicitModules(false), UseBuiltinIncludes(true),
225 UseStandardSystemIncludes(true), UseStandardCXXIncludes(true),
226 UseLibcxx(false), Verbose(false),
227 ModulesValidateOncePerBuildSession(false),
228 ModulesValidateSystemHeaders(false),
229 ValidateASTInputFilesContent(false), UseDebugInfo(false),
230 ModulesValidateDiagnosticOptions(true), ModulesHashContent(false),
231 ModulesStrictContextHash(false) {}
232
233 /// AddPath - Add the \p Path path to the specified \p Group list.
AddPath(StringRef Path,frontend::IncludeDirGroup Group,bool IsFramework,bool IgnoreSysRoot)234 void AddPath(StringRef Path, frontend::IncludeDirGroup Group,
235 bool IsFramework, bool IgnoreSysRoot) {
236 UserEntries.emplace_back(Path, Group, IsFramework, IgnoreSysRoot);
237 }
238
239 /// AddSystemHeaderPrefix - Override whether \#include directives naming a
240 /// path starting with \p Prefix should be considered as naming a system
241 /// header.
AddSystemHeaderPrefix(StringRef Prefix,bool IsSystemHeader)242 void AddSystemHeaderPrefix(StringRef Prefix, bool IsSystemHeader) {
243 SystemHeaderPrefixes.emplace_back(Prefix, IsSystemHeader);
244 }
245
AddVFSOverlayFile(StringRef Name)246 void AddVFSOverlayFile(StringRef Name) {
247 VFSOverlayFiles.push_back(std::string(Name));
248 }
249
AddPrebuiltModulePath(StringRef Name)250 void AddPrebuiltModulePath(StringRef Name) {
251 PrebuiltModulePaths.push_back(std::string(Name));
252 }
253 };
254
hash_value(const HeaderSearchOptions::Entry & E)255 inline llvm::hash_code hash_value(const HeaderSearchOptions::Entry &E) {
256 return llvm::hash_combine(E.Path, E.Group, E.IsFramework, E.IgnoreSysRoot);
257 }
258
259 inline llvm::hash_code
hash_value(const HeaderSearchOptions::SystemHeaderPrefix & SHP)260 hash_value(const HeaderSearchOptions::SystemHeaderPrefix &SHP) {
261 return llvm::hash_combine(SHP.Prefix, SHP.IsSystemHeader);
262 }
263
264 } // namespace clang
265
266 #endif // LLVM_CLANG_LEX_HEADERSEARCHOPTIONS_H
267