1//===- Driver.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 LLD_COFF_DRIVER_H
10#define LLD_COFF_DRIVER_H
11
12#include "Config.h"
13#include "SymbolTable.h"
14#include "lld/Common/LLVM.h"
15#include "lld/Common/Reproduce.h"
16#include "llvm/ADT/StringRef.h"
17#include "llvm/ADT/StringSet.h"
18#include "llvm/Object/Archive.h"
19#include "llvm/Object/COFF.h"
20#include "llvm/Option/Arg.h"
21#include "llvm/Option/ArgList.h"
22#include "llvm/Support/FileSystem.h"
23#include "llvm/Support/TarWriter.h"
24#include "llvm/WindowsDriver/MSVCPaths.h"
25#include <memory>
26#include <optional>
27#include <set>
28#include <vector>
29
30namespace lld::coff {
31
32using llvm::COFF::MachineTypes;
33using llvm::COFF::WindowsSubsystem;
34using std::optional;
35
36class COFFOptTable : public llvm::opt::GenericOptTable {
37public:
38 COFFOptTable();
39};
40
41// The result of parsing the .drective section. The /export: and /include:
42// options are handled separately because they reference symbols, and the number
43// of symbols can be quite large. The LLVM Option library will perform at least
44// one memory allocation per argument, and that is prohibitively slow for
45// parsing directives.
46struct ParsedDirectives {
47 std::vector<StringRef> exports;
48 std::vector<StringRef> includes;
49 std::vector<StringRef> excludes;
50 llvm::opt::InputArgList args;
51};
52
53class ArgParser {
54public:
55 ArgParser(COFFLinkerContext &ctx);
56
57 // Parses command line options.
58 llvm::opt::InputArgList parse(llvm::ArrayRef<const char *> args);
59
60 // Tokenizes a given string and then parses as command line options.
61 llvm::opt::InputArgList parse(StringRef s) { return parse(args: tokenize(s)); }
62
63 // Tokenizes a given string and then parses as command line options in
64 // .drectve section. /EXPORT options are returned in second element
65 // to be processed in fastpath.
66 ParsedDirectives parseDirectives(StringRef s);
67
68private:
69 // Concatenate LINK environment variable.
70 void addLINK(SmallVector<const char *, 256> &argv);
71
72 std::vector<const char *> tokenize(StringRef s);
73
74 COFFLinkerContext &ctx;
75};
76
77class LinkerDriver {
78public:
79 LinkerDriver(COFFLinkerContext &ctx) : ctx(ctx) {}
80
81 void linkerMain(llvm::ArrayRef<const char *> args);
82
83 // Adds various search paths based on the sysroot. Must only be called once
84 // config->machine has been set.
85 void addWinSysRootLibSearchPaths();
86
87 void addClangLibSearchPaths(const std::string &argv0);
88
89 // Used by the resolver to parse .drectve section contents.
90 void parseDirectives(InputFile *file);
91
92 // Used by ArchiveFile to enqueue members.
93 void enqueueArchiveMember(const Archive::Child &c, const Archive::Symbol &sym,
94 StringRef parentName);
95
96 void enqueuePDB(StringRef Path) { enqueuePath(path: Path, wholeArchive: false, lazy: false); }
97
98 MemoryBufferRef takeBuffer(std::unique_ptr<MemoryBuffer> mb);
99
100 void enqueuePath(StringRef path, bool wholeArchive, bool lazy);
101
102 std::unique_ptr<llvm::TarWriter> tar; // for /linkrepro
103
104private:
105 // Searches a file from search paths.
106 std::optional<StringRef> findFileIfNew(StringRef filename);
107 std::optional<StringRef> findLibIfNew(StringRef filename);
108 StringRef findFile(StringRef filename);
109 StringRef findLib(StringRef filename);
110 StringRef findLibMinGW(StringRef filename);
111
112 bool findUnderscoreMangle(StringRef sym);
113
114 // Determines the location of the sysroot based on `args`, environment, etc.
115 void detectWinSysRoot(const llvm::opt::InputArgList &args);
116
117 // Symbol names are mangled by prepending "_" on x86.
118 StringRef mangle(StringRef sym);
119
120 llvm::Triple::ArchType getArch();
121
122 uint64_t getDefaultImageBase();
123
124 bool isDecorated(StringRef sym);
125
126 std::string getMapFile(const llvm::opt::InputArgList &args,
127 llvm::opt::OptSpecifier os,
128 llvm::opt::OptSpecifier osFile);
129
130 std::string getImplibPath();
131
132 // The import name is calculated as follows:
133 //
134 // | LIBRARY w/ ext | LIBRARY w/o ext | no LIBRARY
135 // -----+----------------+---------------------+------------------
136 // LINK | {value} | {value}.{.dll/.exe} | {output name}
137 // LIB | {value} | {value}.dll | {output name}.dll
138 //
139 std::string getImportName(bool asLib);
140
141 void createImportLibrary(bool asLib);
142
143 void parseModuleDefs(StringRef path);
144
145 // Parse an /order file. If an option is given, the linker places COMDAT
146 // sections int he same order as their names appear in the given file.
147 void parseOrderFile(StringRef arg);
148
149 void parseCallGraphFile(StringRef path);
150
151 void parsePDBAltPath();
152
153 // Parses LIB environment which contains a list of search paths.
154 void addLibSearchPaths();
155
156 // Library search path. The first element is always "" (current directory).
157 std::vector<StringRef> searchPaths;
158
159 // Convert resource files and potentially merge input resource object
160 // trees into one resource tree.
161 void convertResources();
162
163 void maybeExportMinGWSymbols(const llvm::opt::InputArgList &args);
164
165 // We don't want to add the same file more than once.
166 // Files are uniquified by their filesystem and file number.
167 std::set<llvm::sys::fs::UniqueID> visitedFiles;
168
169 std::set<std::string> visitedLibs;
170
171 Symbol *addUndefined(StringRef sym);
172
173 StringRef mangleMaybe(Symbol *s);
174
175 // Windows specific -- "main" is not the only main function in Windows.
176 // You can choose one from these four -- {w,}{WinMain,main}.
177 // There are four different entry point functions for them,
178 // {w,}{WinMain,main}CRTStartup, respectively. The linker needs to
179 // choose the right one depending on which "main" function is defined.
180 // This function looks up the symbol table and resolve corresponding
181 // entry point name.
182 StringRef findDefaultEntry();
183 WindowsSubsystem inferSubsystem();
184
185 void addBuffer(std::unique_ptr<MemoryBuffer> mb, bool wholeArchive,
186 bool lazy);
187 void addArchiveBuffer(MemoryBufferRef mbref, StringRef symName,
188 StringRef parentName, uint64_t offsetInArchive);
189
190 void enqueueTask(std::function<void()> task);
191 bool run();
192
193 std::list<std::function<void()>> taskQueue;
194 std::vector<StringRef> filePaths;
195 std::vector<MemoryBufferRef> resources;
196
197 llvm::DenseSet<StringRef> directivesExports;
198 llvm::DenseSet<StringRef> excludedSymbols;
199
200 COFFLinkerContext &ctx;
201
202 llvm::ToolsetLayout vsLayout = llvm::ToolsetLayout::OlderVS;
203 std::string vcToolChainPath;
204 llvm::SmallString<128> diaPath;
205 bool useWinSysRootLibPath = false;
206 llvm::SmallString<128> universalCRTLibPath;
207 int sdkMajor = 0;
208 llvm::SmallString<128> windowsSdkLibPath;
209
210 // Functions below this line are defined in DriverUtils.cpp.
211
212 void printHelp(const char *argv0);
213
214 // Parses a string in the form of "<integer>[,<integer>]".
215 void parseNumbers(StringRef arg, uint64_t *addr, uint64_t *size = nullptr);
216
217 void parseGuard(StringRef arg);
218
219 // Parses a string in the form of "<integer>[.<integer>]".
220 // Minor's default value is 0.
221 void parseVersion(StringRef arg, uint32_t *major, uint32_t *minor);
222
223 // Parses a string in the form of "<subsystem>[,<integer>[.<integer>]]".
224 void parseSubsystem(StringRef arg, WindowsSubsystem *sys, uint32_t *major,
225 uint32_t *minor, bool *gotVersion = nullptr);
226
227 void parseAlternateName(StringRef);
228 void parseMerge(StringRef);
229 void parsePDBPageSize(StringRef);
230 void parseSection(StringRef);
231 void parseAligncomm(StringRef);
232
233 // Parses a string in the form of "[:<integer>]"
234 void parseFunctionPadMin(llvm::opt::Arg *a);
235
236 // Parses a string in the form of "[:<integer>]"
237 void parseDependentLoadFlags(llvm::opt::Arg *a);
238
239 // Parses a string in the form of "EMBED[,=<integer>]|NO".
240 void parseManifest(StringRef arg);
241
242 // Parses a string in the form of "level=<string>|uiAccess=<string>"
243 void parseManifestUAC(StringRef arg);
244
245 // Parses a string in the form of "cd|net[,(cd|net)]*"
246 void parseSwaprun(StringRef arg);
247
248 // Create a resource file containing a manifest XML.
249 std::unique_ptr<MemoryBuffer> createManifestRes();
250 void createSideBySideManifest();
251 std::string createDefaultXml();
252 std::string createManifestXmlWithInternalMt(StringRef defaultXml);
253 std::string createManifestXmlWithExternalMt(StringRef defaultXml);
254 std::string createManifestXml();
255
256 std::unique_ptr<llvm::WritableMemoryBuffer>
257 createMemoryBufferForManifestRes(size_t manifestRes);
258
259 // Used for dllexported symbols.
260 Export parseExport(StringRef arg);
261 void fixupExports();
262 void assignExportOrdinals();
263
264 // Parses a string in the form of "key=value" and check
265 // if value matches previous values for the key.
266 // This feature used in the directive section to reject
267 // incompatible objects.
268 void checkFailIfMismatch(StringRef arg, InputFile *source);
269
270 // Convert Windows resource files (.res files) to a .obj file.
271 MemoryBufferRef convertResToCOFF(ArrayRef<MemoryBufferRef> mbs,
272 ArrayRef<ObjFile *> objs);
273};
274
275// Create enum with OPT_xxx values for each option in Options.td
276enum {
277 OPT_INVALID = 0,
278#define OPTION(...) LLVM_MAKE_OPT_ID(__VA_ARGS__),
279#include "Options.inc"
280#undef OPTION
281};
282
283} // namespace lld::coff
284
285#endif
286

source code of lld/COFF/Driver.h