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[DAGCombiner] Add target hook function to decide folding (mul (add x, c1), c2)
[llvm-project.git] / lld / COFF / DriverUtils.cpp
blobb5abe8b1196d9d2b0b6f69efb854b3ba6f13e481
1 //===- DriverUtils.cpp ----------------------------------------------------===//
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 // This file contains utility functions for the driver. Because there
10 // are so many small functions, we created this separate file to make
11 // Driver.cpp less cluttered.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #include "Config.h"
16 #include "Driver.h"
17 #include "Symbols.h"
18 #include "lld/Common/ErrorHandler.h"
19 #include "lld/Common/Memory.h"
20 #include "llvm/ADT/Optional.h"
21 #include "llvm/ADT/StringSwitch.h"
22 #include "llvm/BinaryFormat/COFF.h"
23 #include "llvm/Object/COFF.h"
24 #include "llvm/Object/WindowsResource.h"
25 #include "llvm/Option/Arg.h"
26 #include "llvm/Option/ArgList.h"
27 #include "llvm/Option/Option.h"
28 #include "llvm/Support/CommandLine.h"
29 #include "llvm/Support/FileUtilities.h"
30 #include "llvm/Support/MathExtras.h"
31 #include "llvm/Support/Process.h"
32 #include "llvm/Support/Program.h"
33 #include "llvm/Support/raw_ostream.h"
34 #include "llvm/WindowsManifest/WindowsManifestMerger.h"
35 #include <limits>
36 #include <memory>
37
38 using namespace llvm::COFF;
39 using namespace llvm;
40 using llvm::sys::Process;
41
42 namespace lld {
43 namespace coff {
44 namespace {
45
46 const uint16_t SUBLANG_ENGLISH_US = 0x0409;
47 const uint16_t RT_MANIFEST = 24;
48
49 class Executor {
50 public:
51 explicit Executor(StringRef s) : prog(saver.save(s)) {}
52 void add(StringRef s) { args.push_back(saver.save(s)); }
53 void add(std::string &s) { args.push_back(saver.save(s)); }
54 void add(Twine s) { args.push_back(saver.save(s)); }
55 void add(const char *s) { args.push_back(saver.save(s)); }
56
57 void run() {
58 ErrorOr<std::string> exeOrErr = sys::findProgramByName(prog);
59 if (auto ec = exeOrErr.getError())
60 fatal("unable to find " + prog + " in PATH: " + ec.message());
61 StringRef exe = saver.save(*exeOrErr);
62 args.insert(args.begin(), exe);
63
64 if (sys::ExecuteAndWait(args[0], args) != 0)
65 fatal("ExecuteAndWait failed: " +
66 llvm::join(args.begin(), args.end(), " "));
67 }
68
69 private:
70 StringRef prog;
71 std::vector<StringRef> args;
72 };
73
74 } // anonymous namespace
75
76 // Parses a string in the form of "<integer>[,<integer>]".
77 void parseNumbers(StringRef arg, uint64_t *addr, uint64_t *size) {
78 StringRef s1, s2;
79 std::tie(s1, s2) = arg.split(',');
80 if (s1.getAsInteger(0, *addr))
81 fatal("invalid number: " + s1);
82 if (size && !s2.empty() && s2.getAsInteger(0, *size))
83 fatal("invalid number: " + s2);
84 }
85
86 // Parses a string in the form of "<integer>[.<integer>]".
87 // If second number is not present, Minor is set to 0.
88 void parseVersion(StringRef arg, uint32_t *major, uint32_t *minor) {
89 StringRef s1, s2;
90 std::tie(s1, s2) = arg.split('.');
91 if (s1.getAsInteger(10, *major))
92 fatal("invalid number: " + s1);
93 *minor = 0;
94 if (!s2.empty() && s2.getAsInteger(10, *minor))
95 fatal("invalid number: " + s2);
96 }
97
98 void parseGuard(StringRef fullArg) {
99 SmallVector<StringRef, 1> splitArgs;
100 fullArg.split(splitArgs, ",");
101 for (StringRef arg : splitArgs) {
102 if (arg.equals_insensitive("no"))
103 config->guardCF = GuardCFLevel::Off;
104 else if (arg.equals_insensitive("nolongjmp"))
105 config->guardCF &= ~GuardCFLevel::LongJmp;
106 else if (arg.equals_insensitive("noehcont"))
107 config->guardCF &= ~GuardCFLevel::EHCont;
108 else if (arg.equals_insensitive("cf"))
109 config->guardCF = GuardCFLevel::CF;
110 else if (arg.equals_insensitive("longjmp"))
111 config->guardCF |= GuardCFLevel::CF | GuardCFLevel::LongJmp;
112 else if (arg.equals_insensitive("ehcont"))
113 config->guardCF |= GuardCFLevel::CF | GuardCFLevel::EHCont;
114 else
115 fatal("invalid argument to /guard: " + arg);
116 }
117 }
118
119 // Parses a string in the form of "<subsystem>[,<integer>[.<integer>]]".
120 void parseSubsystem(StringRef arg, WindowsSubsystem *sys, uint32_t *major,
121 uint32_t *minor, bool *gotVersion) {
122 StringRef sysStr, ver;
123 std::tie(sysStr, ver) = arg.split(',');
124 std::string sysStrLower = sysStr.lower();
125 *sys = StringSwitch<WindowsSubsystem>(sysStrLower)
126 .Case("boot_application", IMAGE_SUBSYSTEM_WINDOWS_BOOT_APPLICATION)
127 .Case("console", IMAGE_SUBSYSTEM_WINDOWS_CUI)
128 .Case("default", IMAGE_SUBSYSTEM_UNKNOWN)
129 .Case("efi_application", IMAGE_SUBSYSTEM_EFI_APPLICATION)
130 .Case("efi_boot_service_driver", IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER)
131 .Case("efi_rom", IMAGE_SUBSYSTEM_EFI_ROM)
132 .Case("efi_runtime_driver", IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER)
133 .Case("native", IMAGE_SUBSYSTEM_NATIVE)
134 .Case("posix", IMAGE_SUBSYSTEM_POSIX_CUI)
135 .Case("windows", IMAGE_SUBSYSTEM_WINDOWS_GUI)
136 .Default(IMAGE_SUBSYSTEM_UNKNOWN);
137 if (*sys == IMAGE_SUBSYSTEM_UNKNOWN && sysStrLower != "default")
138 fatal("unknown subsystem: " + sysStr);
139 if (!ver.empty())
140 parseVersion(ver, major, minor);
141 if (gotVersion)
142 *gotVersion = !ver.empty();
143 }
144
145 // Parse a string of the form of "<from>=<to>".
146 // Results are directly written to Config.
147 void parseAlternateName(StringRef s) {
148 StringRef from, to;
149 std::tie(from, to) = s.split('=');
150 if (from.empty() || to.empty())
151 fatal("/alternatename: invalid argument: " + s);
152 auto it = config->alternateNames.find(from);
153 if (it != config->alternateNames.end() && it->second != to)
154 fatal("/alternatename: conflicts: " + s);
155 config->alternateNames.insert(it, std::make_pair(from, to));
156 }
157
158 // Parse a string of the form of "<from>=<to>".
159 // Results are directly written to Config.
160 void parseMerge(StringRef s) {
161 StringRef from, to;
162 std::tie(from, to) = s.split('=');
163 if (from.empty() || to.empty())
164 fatal("/merge: invalid argument: " + s);
165 if (from == ".rsrc" || to == ".rsrc")
166 fatal("/merge: cannot merge '.rsrc' with any section");
167 if (from == ".reloc" || to == ".reloc")
168 fatal("/merge: cannot merge '.reloc' with any section");
169 auto pair = config->merge.insert(std::make_pair(from, to));
170 bool inserted = pair.second;
171 if (!inserted) {
172 StringRef existing = pair.first->second;
173 if (existing != to)
174 warn(s + ": already merged into " + existing);
175 }
176 }
177
178 static uint32_t parseSectionAttributes(StringRef s) {
179 uint32_t ret = 0;
180 for (char c : s.lower()) {
181 switch (c) {
182 case 'd':
183 ret |= IMAGE_SCN_MEM_DISCARDABLE;
184 break;
185 case 'e':
186 ret |= IMAGE_SCN_MEM_EXECUTE;
187 break;
188 case 'k':
189 ret |= IMAGE_SCN_MEM_NOT_CACHED;
190 break;
191 case 'p':
192 ret |= IMAGE_SCN_MEM_NOT_PAGED;
193 break;
194 case 'r':
195 ret |= IMAGE_SCN_MEM_READ;
196 break;
197 case 's':
198 ret |= IMAGE_SCN_MEM_SHARED;
199 break;
200 case 'w':
201 ret |= IMAGE_SCN_MEM_WRITE;
202 break;
203 default:
204 fatal("/section: invalid argument: " + s);
205 }
206 }
207 return ret;
208 }
209
210 // Parses /section option argument.
211 void parseSection(StringRef s) {
212 StringRef name, attrs;
213 std::tie(name, attrs) = s.split(',');
214 if (name.empty() || attrs.empty())
215 fatal("/section: invalid argument: " + s);
216 config->section[name] = parseSectionAttributes(attrs);
217 }
218
219 // Parses /aligncomm option argument.
220 void parseAligncomm(StringRef s) {
221 StringRef name, align;
222 std::tie(name, align) = s.split(',');
223 if (name.empty() || align.empty()) {
224 error("/aligncomm: invalid argument: " + s);
225 return;
226 }
227 int v;
228 if (align.getAsInteger(0, v)) {
229 error("/aligncomm: invalid argument: " + s);
230 return;
231 }
232 config->alignComm[std::string(name)] =
233 std::max(config->alignComm[std::string(name)], 1 << v);
234 }
235
236 // Parses /functionpadmin option argument.
237 void parseFunctionPadMin(llvm::opt::Arg *a, llvm::COFF::MachineTypes machine) {
238 StringRef arg = a->getNumValues() ? a->getValue() : "";
239 if (!arg.empty()) {
240 // Optional padding in bytes is given.
241 if (arg.getAsInteger(0, config->functionPadMin))
242 error("/functionpadmin: invalid argument: " + arg);
243 return;
244 }
245 // No optional argument given.
246 // Set default padding based on machine, similar to link.exe.
247 // There is no default padding for ARM platforms.
248 if (machine == I386) {
249 config->functionPadMin = 5;
250 } else if (machine == AMD64) {
251 config->functionPadMin = 6;
252 } else {
253 error("/functionpadmin: invalid argument for this machine: " + arg);
254 }
255 }
256
257 // Parses a string in the form of "EMBED[,=<integer>]|NO".
258 // Results are directly written to Config.
259 void parseManifest(StringRef arg) {
260 if (arg.equals_insensitive("no")) {
261 config->manifest = Configuration::No;
262 return;
263 }
264 if (!arg.startswith_insensitive("embed"))
265 fatal("invalid option " + arg);
266 config->manifest = Configuration::Embed;
267 arg = arg.substr(strlen("embed"));
268 if (arg.empty())
269 return;
270 if (!arg.startswith_insensitive(",id="))
271 fatal("invalid option " + arg);
272 arg = arg.substr(strlen(",id="));
273 if (arg.getAsInteger(0, config->manifestID))
274 fatal("invalid option " + arg);
275 }
276
277 // Parses a string in the form of "level=<string>|uiAccess=<string>|NO".
278 // Results are directly written to Config.
279 void parseManifestUAC(StringRef arg) {
280 if (arg.equals_insensitive("no")) {
281 config->manifestUAC = false;
282 return;
283 }
284 for (;;) {
285 arg = arg.ltrim();
286 if (arg.empty())
287 return;
288 if (arg.startswith_insensitive("level=")) {
289 arg = arg.substr(strlen("level="));
290 std::tie(config->manifestLevel, arg) = arg.split(" ");
291 continue;
292 }
293 if (arg.startswith_insensitive("uiaccess=")) {
294 arg = arg.substr(strlen("uiaccess="));
295 std::tie(config->manifestUIAccess, arg) = arg.split(" ");
296 continue;
297 }
298 fatal("invalid option " + arg);
299 }
300 }
301
302 // Parses a string in the form of "cd|net[,(cd|net)]*"
303 // Results are directly written to Config.
304 void parseSwaprun(StringRef arg) {
305 do {
306 StringRef swaprun, newArg;
307 std::tie(swaprun, newArg) = arg.split(',');
308 if (swaprun.equals_insensitive("cd"))
309 config->swaprunCD = true;
310 else if (swaprun.equals_insensitive("net"))
311 config->swaprunNet = true;
312 else if (swaprun.empty())
313 error("/swaprun: missing argument");
314 else
315 error("/swaprun: invalid argument: " + swaprun);
316 // To catch trailing commas, e.g. `/spawrun:cd,`
317 if (newArg.empty() && arg.endswith(","))
318 error("/swaprun: missing argument");
319 arg = newArg;
320 } while (!arg.empty());
321 }
322
323 // An RAII temporary file class that automatically removes a temporary file.
324 namespace {
325 class TemporaryFile {
326 public:
327 TemporaryFile(StringRef prefix, StringRef extn, StringRef contents = "") {
328 SmallString<128> s;
329 if (auto ec = sys::fs::createTemporaryFile("lld-" + prefix, extn, s))
330 fatal("cannot create a temporary file: " + ec.message());
331 path = std::string(s.str());
332
333 if (!contents.empty()) {
334 std::error_code ec;
335 raw_fd_ostream os(path, ec, sys::fs::OF_None);
336 if (ec)
337 fatal("failed to open " + path + ": " + ec.message());
338 os << contents;
339 }
340 }
341
342 TemporaryFile(TemporaryFile &&obj) {
343 std::swap(path, obj.path);
344 }
345
346 ~TemporaryFile() {
347 if (path.empty())
348 return;
349 if (sys::fs::remove(path))
350 fatal("failed to remove " + path);
351 }
352
353 // Returns a memory buffer of this temporary file.
354 // Note that this function does not leave the file open,
355 // so it is safe to remove the file immediately after this function
356 // is called (you cannot remove an opened file on Windows.)
357 std::unique_ptr<MemoryBuffer> getMemoryBuffer() {
358 // IsVolatile=true forces MemoryBuffer to not use mmap().
359 return CHECK(MemoryBuffer::getFile(path, /*IsText=*/false,
360 /*RequiresNullTerminator=*/false,
361 /*IsVolatile=*/true),
362 "could not open " + path);
363 }
364
365 std::string path;
366 };
367 }
368
369 static std::string createDefaultXml() {
370 std::string ret;
371 raw_string_ostream os(ret);
372
373 // Emit the XML. Note that we do *not* verify that the XML attributes are
374 // syntactically correct. This is intentional for link.exe compatibility.
375 os << "<?xml version=\"1.0\" standalone=\"yes\"?>\n"
376 << "<assembly xmlns=\"urn:schemas-microsoft-com:asm.v1\"\n"
377 << " manifestVersion=\"1.0\">\n";
378 if (config->manifestUAC) {
379 os << " <trustInfo>\n"
380 << " <security>\n"
381 << " <requestedPrivileges>\n"
382 << " <requestedExecutionLevel level=" << config->manifestLevel
383 << " uiAccess=" << config->manifestUIAccess << "/>\n"
384 << " </requestedPrivileges>\n"
385 << " </security>\n"
386 << " </trustInfo>\n";
387 }
388 if (!config->manifestDependency.empty()) {
389 os << " <dependency>\n"
390 << " <dependentAssembly>\n"
391 << " <assemblyIdentity " << config->manifestDependency << " />\n"
392 << " </dependentAssembly>\n"
393 << " </dependency>\n";
394 }
395 os << "</assembly>\n";
396 return os.str();
397 }
398
399 static std::string createManifestXmlWithInternalMt(StringRef defaultXml) {
400 std::unique_ptr<MemoryBuffer> defaultXmlCopy =
401 MemoryBuffer::getMemBufferCopy(defaultXml);
402
403 windows_manifest::WindowsManifestMerger merger;
404 if (auto e = merger.merge(*defaultXmlCopy.get()))
405 fatal("internal manifest tool failed on default xml: " +
406 toString(std::move(e)));
407
408 for (StringRef filename : config->manifestInput) {
409 std::unique_ptr<MemoryBuffer> manifest =
410 check(MemoryBuffer::getFile(filename));
411 if (auto e = merger.merge(*manifest.get()))
412 fatal("internal manifest tool failed on file " + filename + ": " +
413 toString(std::move(e)));
414 }
415
416 return std::string(merger.getMergedManifest().get()->getBuffer());
417 }
418
419 static std::string createManifestXmlWithExternalMt(StringRef defaultXml) {
420 // Create the default manifest file as a temporary file.
421 TemporaryFile Default("defaultxml", "manifest");
422 std::error_code ec;
423 raw_fd_ostream os(Default.path, ec, sys::fs::OF_TextWithCRLF);
424 if (ec)
425 fatal("failed to open " + Default.path + ": " + ec.message());
426 os << defaultXml;
427 os.close();
428
429 // Merge user-supplied manifests if they are given. Since libxml2 is not
430 // enabled, we must shell out to Microsoft's mt.exe tool.
431 TemporaryFile user("user", "manifest");
432
433 Executor e("mt.exe");
434 e.add("/manifest");
435 e.add(Default.path);
436 for (StringRef filename : config->manifestInput) {
437 e.add("/manifest");
438 e.add(filename);
439 }
440 e.add("/nologo");
441 e.add("/out:" + StringRef(user.path));
442 e.run();
443
444 return std::string(
445 CHECK(MemoryBuffer::getFile(user.path), "could not open " + user.path)
446 .get()
447 ->getBuffer());
448 }
449
450 static std::string createManifestXml() {
451 std::string defaultXml = createDefaultXml();
452 if (config->manifestInput.empty())
453 return defaultXml;
454
455 if (windows_manifest::isAvailable())
456 return createManifestXmlWithInternalMt(defaultXml);
457
458 return createManifestXmlWithExternalMt(defaultXml);
459 }
460
461 static std::unique_ptr<WritableMemoryBuffer>
462 createMemoryBufferForManifestRes(size_t manifestSize) {
463 size_t resSize = alignTo(
464 object::WIN_RES_MAGIC_SIZE + object::WIN_RES_NULL_ENTRY_SIZE +
465 sizeof(object::WinResHeaderPrefix) + sizeof(object::WinResIDs) +
466 sizeof(object::WinResHeaderSuffix) + manifestSize,
467 object::WIN_RES_DATA_ALIGNMENT);
468 return WritableMemoryBuffer::getNewMemBuffer(resSize, config->outputFile +
469 ".manifest.res");
470 }
471
472 static void writeResFileHeader(char *&buf) {
473 memcpy(buf, COFF::WinResMagic, sizeof(COFF::WinResMagic));
474 buf += sizeof(COFF::WinResMagic);
475 memset(buf, 0, object::WIN_RES_NULL_ENTRY_SIZE);
476 buf += object::WIN_RES_NULL_ENTRY_SIZE;
477 }
478
479 static void writeResEntryHeader(char *&buf, size_t manifestSize) {
480 // Write the prefix.
481 auto *prefix = reinterpret_cast<object::WinResHeaderPrefix *>(buf);
482 prefix->DataSize = manifestSize;
483 prefix->HeaderSize = sizeof(object::WinResHeaderPrefix) +
484 sizeof(object::WinResIDs) +
485 sizeof(object::WinResHeaderSuffix);
486 buf += sizeof(object::WinResHeaderPrefix);
487
488 // Write the Type/Name IDs.
489 auto *iDs = reinterpret_cast<object::WinResIDs *>(buf);
490 iDs->setType(RT_MANIFEST);
491 iDs->setName(config->manifestID);
492 buf += sizeof(object::WinResIDs);
493
494 // Write the suffix.
495 auto *suffix = reinterpret_cast<object::WinResHeaderSuffix *>(buf);
496 suffix->DataVersion = 0;
497 suffix->MemoryFlags = object::WIN_RES_PURE_MOVEABLE;
498 suffix->Language = SUBLANG_ENGLISH_US;
499 suffix->Version = 0;
500 suffix->Characteristics = 0;
501 buf += sizeof(object::WinResHeaderSuffix);
502 }
503
504 // Create a resource file containing a manifest XML.
505 std::unique_ptr<MemoryBuffer> createManifestRes() {
506 std::string manifest = createManifestXml();
507
508 std::unique_ptr<WritableMemoryBuffer> res =
509 createMemoryBufferForManifestRes(manifest.size());
510
511 char *buf = res->getBufferStart();
512 writeResFileHeader(buf);
513 writeResEntryHeader(buf, manifest.size());
514
515 // Copy the manifest data into the .res file.
516 std::copy(manifest.begin(), manifest.end(), buf);
517 return std::move(res);
518 }
519
520 void createSideBySideManifest() {
521 std::string path = std::string(config->manifestFile);
522 if (path == "")
523 path = config->outputFile + ".manifest";
524 std::error_code ec;
525 raw_fd_ostream out(path, ec, sys::fs::OF_TextWithCRLF);
526 if (ec)
527 fatal("failed to create manifest: " + ec.message());
528 out << createManifestXml();
529 }
530
531 // Parse a string in the form of
532 // "<name>[=<internalname>][,@ordinal[,NONAME]][,DATA][,PRIVATE]"
533 // or "<name>=<dllname>.<name>".
534 // Used for parsing /export arguments.
535 Export parseExport(StringRef arg) {
536 Export e;
537 StringRef rest;
538 std::tie(e.name, rest) = arg.split(",");
539 if (e.name.empty())
540 goto err;
541
542 if (e.name.contains('=')) {
543 StringRef x, y;
544 std::tie(x, y) = e.name.split("=");
545
546 // If "<name>=<dllname>.<name>".
547 if (y.contains(".")) {
548 e.name = x;
549 e.forwardTo = y;
550 return e;
551 }
552
553 e.extName = x;
554 e.name = y;
555 if (e.name.empty())
556 goto err;
557 }
558
559 // If "<name>=<internalname>[,@ordinal[,NONAME]][,DATA][,PRIVATE]"
560 while (!rest.empty()) {
561 StringRef tok;
562 std::tie(tok, rest) = rest.split(",");
563 if (tok.equals_insensitive("noname")) {
564 if (e.ordinal == 0)
565 goto err;
566 e.noname = true;
567 continue;
568 }
569 if (tok.equals_insensitive("data")) {
570 e.data = true;
571 continue;
572 }
573 if (tok.equals_insensitive("constant")) {
574 e.constant = true;
575 continue;
576 }
577 if (tok.equals_insensitive("private")) {
578 e.isPrivate = true;
579 continue;
580 }
581 if (tok.startswith("@")) {
582 int32_t ord;
583 if (tok.substr(1).getAsInteger(0, ord))
584 goto err;
585 if (ord <= 0 || 65535 < ord)
586 goto err;
587 e.ordinal = ord;
588 continue;
589 }
590 goto err;
591 }
592 return e;
593
594 err:
595 fatal("invalid /export: " + arg);
596 }
597
598 static StringRef undecorate(StringRef sym) {
599 if (config->machine != I386)
600 return sym;
601 // In MSVC mode, a fully decorated stdcall function is exported
602 // as-is with the leading underscore (with type IMPORT_NAME).
603 // In MinGW mode, a decorated stdcall function gets the underscore
604 // removed, just like normal cdecl functions.
605 if (sym.startswith("_") && sym.contains('@') && !config->mingw)
606 return sym;
607 return sym.startswith("_") ? sym.substr(1) : sym;
608 }
609
610 // Convert stdcall/fastcall style symbols into unsuffixed symbols,
611 // with or without a leading underscore. (MinGW specific.)
612 static StringRef killAt(StringRef sym, bool prefix) {
613 if (sym.empty())
614 return sym;
615 // Strip any trailing stdcall suffix
616 sym = sym.substr(0, sym.find('@', 1));
617 if (!sym.startswith("@")) {
618 if (prefix && !sym.startswith("_"))
619 return saver.save("_" + sym);
620 return sym;
621 }
622 // For fastcall, remove the leading @ and replace it with an
623 // underscore, if prefixes are used.
624 sym = sym.substr(1);
625 if (prefix)
626 sym = saver.save("_" + sym);
627 return sym;
628 }
629
630 // Performs error checking on all /export arguments.
631 // It also sets ordinals.
632 void fixupExports() {
633 // Symbol ordinals must be unique.
634 std::set<uint16_t> ords;
635 for (Export &e : config->exports) {
636 if (e.ordinal == 0)
637 continue;
638 if (!ords.insert(e.ordinal).second)
639 fatal("duplicate export ordinal: " + e.name);
640 }
641
642 for (Export &e : config->exports) {
643 if (!e.forwardTo.empty()) {
644 e.exportName = undecorate(e.name);
645 } else {
646 e.exportName = undecorate(e.extName.empty() ? e.name : e.extName);
647 }
648 }
649
650 if (config->killAt && config->machine == I386) {
651 for (Export &e : config->exports) {
652 e.name = killAt(e.name, true);
653 e.exportName = killAt(e.exportName, false);
654 e.extName = killAt(e.extName, true);
655 e.symbolName = killAt(e.symbolName, true);
656 }
657 }
658
659 // Uniquefy by name.
660 DenseMap<StringRef, Export *> map(config->exports.size());
661 std::vector<Export> v;
662 for (Export &e : config->exports) {
663 auto pair = map.insert(std::make_pair(e.exportName, &e));
664 bool inserted = pair.second;
665 if (inserted) {
666 v.push_back(e);
667 continue;
668 }
669 Export *existing = pair.first->second;
670 if (e == *existing || e.name != existing->name)
671 continue;
672 warn("duplicate /export option: " + e.name);
673 }
674 config->exports = std::move(v);
675
676 // Sort by name.
677 std::sort(config->exports.begin(), config->exports.end(),
678 [](const Export &a, const Export &b) {
679 return a.exportName < b.exportName;
680 });
681 }
682
683 void assignExportOrdinals() {
684 // Assign unique ordinals if default (= 0).
685 uint32_t max = 0;
686 for (Export &e : config->exports)
687 max = std::max(max, (uint32_t)e.ordinal);
688 for (Export &e : config->exports)
689 if (e.ordinal == 0)
690 e.ordinal = ++max;
691 if (max > std::numeric_limits<uint16_t>::max())
692 fatal("too many exported symbols (max " +
693 Twine(std::numeric_limits<uint16_t>::max()) + ")");
694 }
695
696 // Parses a string in the form of "key=value" and check
697 // if value matches previous values for the same key.
698 void checkFailIfMismatch(StringRef arg, InputFile *source) {
699 StringRef k, v;
700 std::tie(k, v) = arg.split('=');
701 if (k.empty() || v.empty())
702 fatal("/failifmismatch: invalid argument: " + arg);
703 std::pair<StringRef, InputFile *> existing = config->mustMatch[k];
704 if (!existing.first.empty() && v != existing.first) {
705 std::string sourceStr = source ? toString(source) : "cmd-line";
706 std::string existingStr =
707 existing.second ? toString(existing.second) : "cmd-line";
708 fatal("/failifmismatch: mismatch detected for '" + k + "':\n>>> " +
709 existingStr + " has value " + existing.first + "\n>>> " + sourceStr +
710 " has value " + v);
711 }
712 config->mustMatch[k] = {v, source};
713 }
714
715 // Convert Windows resource files (.res files) to a .obj file.
716 // Does what cvtres.exe does, but in-process and cross-platform.
717 MemoryBufferRef convertResToCOFF(ArrayRef<MemoryBufferRef> mbs,
718 ArrayRef<ObjFile *> objs) {
719 object::WindowsResourceParser parser(/* MinGW */ config->mingw);
720
721 std::vector<std::string> duplicates;
722 for (MemoryBufferRef mb : mbs) {
723 std::unique_ptr<object::Binary> bin = check(object::createBinary(mb));
724 object::WindowsResource *rf = dyn_cast<object::WindowsResource>(bin.get());
725 if (!rf)
726 fatal("cannot compile non-resource file as resource");
727
728 if (auto ec = parser.parse(rf, duplicates))
729 fatal(toString(std::move(ec)));
730 }
731
732 // Note: This processes all .res files before all objs. Ideally they'd be
733 // handled in the same order they were linked (to keep the right one, if
734 // there are duplicates that are tolerated due to forceMultipleRes).
735 for (ObjFile *f : objs) {
736 object::ResourceSectionRef rsf;
737 if (auto ec = rsf.load(f->getCOFFObj()))
738 fatal(toString(f) + ": " + toString(std::move(ec)));
739
740 if (auto ec = parser.parse(rsf, f->getName(), duplicates))
741 fatal(toString(std::move(ec)));
742 }
743
744 if (config->mingw)
745 parser.cleanUpManifests(duplicates);
746
747 for (const auto &dupeDiag : duplicates)
748 if (config->forceMultipleRes)
749 warn(dupeDiag);
750 else
751 error(dupeDiag);
752
753 Expected<std::unique_ptr<MemoryBuffer>> e =
754 llvm::object::writeWindowsResourceCOFF(config->machine, parser,
755 config->timestamp);
756 if (!e)
757 fatal("failed to write .res to COFF: " + toString(e.takeError()));
758
759 MemoryBufferRef mbref = **e;
760 make<std::unique_ptr<MemoryBuffer>>(std::move(*e)); // take ownership
761 return mbref;
762 }
763
764 // Create OptTable
765
766 // Create prefix string literals used in Options.td
767 #define PREFIX(NAME, VALUE) const char *const NAME[] = VALUE;
768 #include "Options.inc"
769 #undef PREFIX
770
771 // Create table mapping all options defined in Options.td
772 static const llvm::opt::OptTable::Info infoTable[] = {
773 #define OPTION(X1, X2, ID, KIND, GROUP, ALIAS, X7, X8, X9, X10, X11, X12) \
774 {X1, X2, X10, X11, OPT_##ID, llvm::opt::Option::KIND##Class, \
775 X9, X8, OPT_##GROUP, OPT_##ALIAS, X7, X12},
776 #include "Options.inc"
777 #undef OPTION
778 };
779
780 COFFOptTable::COFFOptTable() : OptTable(infoTable, true) {}
781
782 COFFOptTable optTable;
783
784 // Set color diagnostics according to --color-diagnostics={auto,always,never}
785 // or --no-color-diagnostics flags.
786 static void handleColorDiagnostics(opt::InputArgList &args) {
787 auto *arg = args.getLastArg(OPT_color_diagnostics, OPT_color_diagnostics_eq,
788 OPT_no_color_diagnostics);
789 if (!arg)
790 return;
791 if (arg->getOption().getID() == OPT_color_diagnostics) {
792 lld::errs().enable_colors(true);
793 } else if (arg->getOption().getID() == OPT_no_color_diagnostics) {
794 lld::errs().enable_colors(false);
795 } else {
796 StringRef s = arg->getValue();
797 if (s == "always")
798 lld::errs().enable_colors(true);
799 else if (s == "never")
800 lld::errs().enable_colors(false);
801 else if (s != "auto")
802 error("unknown option: --color-diagnostics=" + s);
803 }
804 }
805
806 static cl::TokenizerCallback getQuotingStyle(opt::InputArgList &args) {
807 if (auto *arg = args.getLastArg(OPT_rsp_quoting)) {
808 StringRef s = arg->getValue();
809 if (s != "windows" && s != "posix")
810 error("invalid response file quoting: " + s);
811 if (s == "windows")
812 return cl::TokenizeWindowsCommandLine;
813 return cl::TokenizeGNUCommandLine;
814 }
815 // The COFF linker always defaults to Windows quoting.
816 return cl::TokenizeWindowsCommandLine;
817 }
818
819 // Parses a given list of options.
820 opt::InputArgList ArgParser::parse(ArrayRef<const char *> argv) {
821 // Make InputArgList from string vectors.
822 unsigned missingIndex;
823 unsigned missingCount;
824
825 // We need to get the quoting style for response files before parsing all
826 // options so we parse here before and ignore all the options but
827 // --rsp-quoting and /lldignoreenv.
828 // (This means --rsp-quoting can't be added through %LINK%.)
829 opt::InputArgList args = optTable.ParseArgs(argv, missingIndex, missingCount);
830
831 // Expand response files (arguments in the form of @<filename>) and insert
832 // flags from %LINK% and %_LINK_%, and then parse the argument again.
833 SmallVector<const char *, 256> expandedArgv(argv.data(),
834 argv.data() + argv.size());
835 if (!args.hasArg(OPT_lldignoreenv))
836 addLINK(expandedArgv);
837 cl::ExpandResponseFiles(saver, getQuotingStyle(args), expandedArgv);
838 args = optTable.ParseArgs(makeArrayRef(expandedArgv).drop_front(),
839 missingIndex, missingCount);
840
841 // Print the real command line if response files are expanded.
842 if (args.hasArg(OPT_verbose) && argv.size() != expandedArgv.size()) {
843 std::string msg = "Command line:";
844 for (const char *s : expandedArgv)
845 msg += " " + std::string(s);
846 message(msg);
847 }
848
849 // Save the command line after response file expansion so we can write it to
850 // the PDB if necessary.
851 config->argv = {expandedArgv.begin(), expandedArgv.end()};
852
853 // Handle /WX early since it converts missing argument warnings to errors.
854 errorHandler().fatalWarnings = args.hasFlag(OPT_WX, OPT_WX_no, false);
855
856 if (missingCount)
857 fatal(Twine(args.getArgString(missingIndex)) + ": missing argument");
858
859 handleColorDiagnostics(args);
860
861 for (opt::Arg *arg : args.filtered(OPT_UNKNOWN)) {
862 std::string nearest;
863 if (optTable.findNearest(arg->getAsString(args), nearest) > 1)
864 warn("ignoring unknown argument '" + arg->getAsString(args) + "'");
865 else
866 warn("ignoring unknown argument '" + arg->getAsString(args) +
867 "', did you mean '" + nearest + "'");
868 }
869
870 if (args.hasArg(OPT_lib))
871 warn("ignoring /lib since it's not the first argument");
872
873 return args;
874 }
875
876 // Tokenizes and parses a given string as command line in .drective section.
877 ParsedDirectives ArgParser::parseDirectives(StringRef s) {
878 ParsedDirectives result;
879 SmallVector<const char *, 16> rest;
880
881 // Handle /EXPORT and /INCLUDE in a fast path. These directives can appear for
882 // potentially every symbol in the object, so they must be handled quickly.
883 SmallVector<StringRef, 16> tokens;
884 cl::TokenizeWindowsCommandLineNoCopy(s, saver, tokens);
885 for (StringRef tok : tokens) {
886 if (tok.startswith_insensitive("/export:") ||
887 tok.startswith_insensitive("-export:"))
888 result.exports.push_back(tok.substr(strlen("/export:")));
889 else if (tok.startswith_insensitive("/include:") ||
890 tok.startswith_insensitive("-include:"))
891 result.includes.push_back(tok.substr(strlen("/include:")));
892 else {
893 // Copy substrings that are not valid C strings. The tokenizer may have
894 // already copied quoted arguments for us, so those do not need to be
895 // copied again.
896 bool HasNul = tok.end() != s.end() && tok.data()[tok.size()] == '\0';
897 rest.push_back(HasNul ? tok.data() : saver.save(tok).data());
898 }
899 }
900
901 // Make InputArgList from unparsed string vectors.
902 unsigned missingIndex;
903 unsigned missingCount;
904
905 result.args = optTable.ParseArgs(rest, missingIndex, missingCount);
906
907 if (missingCount)
908 fatal(Twine(result.args.getArgString(missingIndex)) + ": missing argument");
909 for (auto *arg : result.args.filtered(OPT_UNKNOWN))
910 warn("ignoring unknown argument: " + arg->getAsString(result.args));
911 return result;
912 }
913
914 // link.exe has an interesting feature. If LINK or _LINK_ environment
915 // variables exist, their contents are handled as command line strings.
916 // So you can pass extra arguments using them.
917 void ArgParser::addLINK(SmallVector<const char *, 256> &argv) {
918 // Concatenate LINK env and command line arguments, and then parse them.
919 if (Optional<std::string> s = Process::GetEnv("LINK")) {
920 std::vector<const char *> v = tokenize(*s);
921 argv.insert(std::next(argv.begin()), v.begin(), v.end());
922 }
923 if (Optional<std::string> s = Process::GetEnv("_LINK_")) {
924 std::vector<const char *> v = tokenize(*s);
925 argv.insert(std::next(argv.begin()), v.begin(), v.end());
926 }
927 }
928
929 std::vector<const char *> ArgParser::tokenize(StringRef s) {
930 SmallVector<const char *, 16> tokens;
931 cl::TokenizeWindowsCommandLine(s, saver, tokens);
932 return std::vector<const char *>(tokens.begin(), tokens.end());
933 }
934
935 void printHelp(const char *argv0) {
936 optTable.printHelp(lld::outs(),
937 (std::string(argv0) + " [options] file...").c_str(),
938 "LLVM Linker", false);
939 }
940
941 } // namespace coff
942 } // namespace lld
LLVM monorepo