clang 20.0.0git
Job.cpp
Go to the documentation of this file.
1//===- Job.cpp - Command to Execute ---------------------------------------===//
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 "clang/Driver/Job.h"
10#include "clang/Basic/LLVM.h"
11#include "clang/Driver/Driver.h"
13#include "clang/Driver/Tool.h"
15#include "llvm/ADT/ArrayRef.h"
16#include "llvm/ADT/SmallString.h"
17#include "llvm/ADT/SmallVector.h"
18#include "llvm/ADT/StringExtras.h"
19#include "llvm/ADT/StringRef.h"
20#include "llvm/ADT/StringSet.h"
21#include "llvm/ADT/StringSwitch.h"
22#include "llvm/Support/CrashRecoveryContext.h"
23#include "llvm/Support/FileSystem.h"
24#include "llvm/Support/Path.h"
25#include "llvm/Support/PrettyStackTrace.h"
26#include "llvm/Support/Program.h"
27#include "llvm/Support/raw_ostream.h"
28#include <cassert>
29#include <cstddef>
30#include <string>
31#include <system_error>
32#include <utility>
33
34using namespace clang;
35using namespace driver;
36
37Command::Command(const Action &Source, const Tool &Creator,
38 ResponseFileSupport ResponseSupport, const char *Executable,
39 const llvm::opt::ArgStringList &Arguments,
41 const char *PrependArg)
42 : Source(Source), Creator(Creator), ResponseSupport(ResponseSupport),
43 Executable(Executable), PrependArg(PrependArg), Arguments(Arguments) {
44 for (const auto &II : Inputs)
45 if (II.isFilename())
46 InputInfoList.push_back(II);
47 for (const auto &II : Outputs)
48 if (II.isFilename())
49 OutputFilenames.push_back(II.getFilename());
50}
51
52/// Check if the compiler flag in question should be skipped when
53/// emitting a reproducer. Also track how many arguments it has and if the
54/// option is some kind of include path.
55static bool skipArgs(const char *Flag, bool HaveCrashVFS, int &SkipNum,
56 bool &IsInclude) {
57 SkipNum = 2;
58 // These flags are all of the form -Flag <Arg> and are treated as two
59 // arguments. Therefore, we need to skip the flag and the next argument.
60 bool ShouldSkip = llvm::StringSwitch<bool>(Flag)
61 .Cases("-MF", "-MT", "-MQ", "-serialize-diagnostic-file", true)
62 .Cases("-o", "-dependency-file", true)
63 .Cases("-fdebug-compilation-dir", "-diagnostic-log-file", true)
64 .Cases("-dwarf-debug-flags", "-ivfsoverlay", true)
65 .Default(false);
66 if (ShouldSkip)
67 return true;
68
69 // Some include flags shouldn't be skipped if we have a crash VFS
70 IsInclude = llvm::StringSwitch<bool>(Flag)
71 .Cases("-include", "-header-include-file", true)
72 .Cases("-idirafter", "-internal-isystem", "-iwithprefix", true)
73 .Cases("-internal-externc-isystem", "-iprefix", true)
74 .Cases("-iwithprefixbefore", "-isystem", "-iquote", true)
75 .Cases("-isysroot", "-I", "-F", "-resource-dir", true)
76 .Cases("-iframework", "-include-pch", true)
77 .Default(false);
78 if (IsInclude)
79 return !HaveCrashVFS;
80
81 // The remaining flags are treated as a single argument.
82
83 // These flags are all of the form -Flag and have no second argument.
84 ShouldSkip = llvm::StringSwitch<bool>(Flag)
85 .Cases("-M", "-MM", "-MG", "-MP", "-MD", true)
86 .Case("-MMD", true)
87 .Default(false);
88
89 // Match found.
90 SkipNum = 1;
91 if (ShouldSkip)
92 return true;
93
94 // These flags are treated as a single argument (e.g., -F<Dir>).
95 StringRef FlagRef(Flag);
96 IsInclude = FlagRef.starts_with("-F") || FlagRef.starts_with("-I");
97 if (IsInclude)
98 return !HaveCrashVFS;
99 if (FlagRef.starts_with("-fmodules-cache-path="))
100 return true;
101
102 SkipNum = 0;
103 return false;
104}
105
106void Command::writeResponseFile(raw_ostream &OS) const {
107 // In a file list, we only write the set of inputs to the response file
108 if (ResponseSupport.ResponseKind == ResponseFileSupport::RF_FileList) {
109 for (const auto *Arg : InputFileList) {
110 OS << Arg << '\n';
111 }
112 return;
113 }
114
115 // In regular response files, we send all arguments to the response file.
116 // Wrapping all arguments in double quotes ensures that both Unix tools and
117 // Windows tools understand the response file.
118 for (const auto *Arg : Arguments) {
119 OS << '"';
120
121 for (; *Arg != '\0'; Arg++) {
122 if (*Arg == '\"' || *Arg == '\\') {
123 OS << '\\';
124 }
125 OS << *Arg;
126 }
127
128 OS << "\" ";
129 }
130}
131
132void Command::buildArgvForResponseFile(
134 // When not a file list, all arguments are sent to the response file.
135 // This leaves us to set the argv to a single parameter, requesting the tool
136 // to read the response file.
137 if (ResponseSupport.ResponseKind != ResponseFileSupport::RF_FileList) {
138 Out.push_back(Executable);
139 Out.push_back(ResponseFileFlag.c_str());
140 return;
141 }
142
143 llvm::StringSet<> Inputs;
144 for (const auto *InputName : InputFileList)
145 Inputs.insert(InputName);
146 Out.push_back(Executable);
147
148 if (PrependArg)
149 Out.push_back(PrependArg);
150
151 // In a file list, build args vector ignoring parameters that will go in the
152 // response file (elements of the InputFileList vector)
153 bool FirstInput = true;
154 for (const auto *Arg : Arguments) {
155 if (Inputs.count(Arg) == 0) {
156 Out.push_back(Arg);
157 } else if (FirstInput) {
158 FirstInput = false;
159 Out.push_back(ResponseSupport.ResponseFlag);
160 Out.push_back(ResponseFile);
161 }
162 }
163}
164
165/// Rewrite relative include-like flag paths to absolute ones.
166static void
168 size_t NumArgs,
170 using namespace llvm;
171 using namespace sys;
172
173 auto getAbsPath = [](StringRef InInc, SmallVectorImpl<char> &OutInc) -> bool {
174 if (path::is_absolute(InInc)) // Nothing to do here...
175 return false;
176 std::error_code EC = fs::current_path(OutInc);
177 if (EC)
178 return false;
179 path::append(OutInc, InInc);
180 return true;
181 };
182
183 SmallString<128> NewInc;
184 if (NumArgs == 1) {
185 StringRef FlagRef(Args[Idx + NumArgs - 1]);
186 assert((FlagRef.starts_with("-F") || FlagRef.starts_with("-I")) &&
187 "Expecting -I or -F");
188 StringRef Inc = FlagRef.slice(2, StringRef::npos);
189 if (getAbsPath(Inc, NewInc)) {
190 SmallString<128> NewArg(FlagRef.slice(0, 2));
191 NewArg += NewInc;
192 IncFlags.push_back(std::move(NewArg));
193 }
194 return;
195 }
196
197 assert(NumArgs == 2 && "Not expecting more than two arguments");
198 StringRef Inc(Args[Idx + NumArgs - 1]);
199 if (!getAbsPath(Inc, NewInc))
200 return;
201 IncFlags.push_back(SmallString<128>(Args[Idx]));
202 IncFlags.push_back(std::move(NewInc));
203}
204
205void Command::Print(raw_ostream &OS, const char *Terminator, bool Quote,
206 CrashReportInfo *CrashInfo) const {
207 // Always quote the exe.
208 OS << ' ';
209 llvm::sys::printArg(OS, Executable, /*Quote=*/true);
210
211 ArrayRef<const char *> Args = Arguments;
213 if (ResponseFile != nullptr) {
214 buildArgvForResponseFile(ArgsRespFile);
215 Args = ArrayRef<const char *>(ArgsRespFile).slice(1); // no executable name
216 } else if (PrependArg) {
217 OS << ' ';
218 llvm::sys::printArg(OS, PrependArg, /*Quote=*/true);
219 }
220
221 bool HaveCrashVFS = CrashInfo && !CrashInfo->VFSPath.empty();
222 for (size_t i = 0, e = Args.size(); i < e; ++i) {
223 const char *const Arg = Args[i];
224
225 if (CrashInfo) {
226 int NumArgs = 0;
227 bool IsInclude = false;
228 if (skipArgs(Arg, HaveCrashVFS, NumArgs, IsInclude)) {
229 i += NumArgs - 1;
230 continue;
231 }
232
233 // Relative includes need to be expanded to absolute paths.
234 if (HaveCrashVFS && IsInclude) {
235 SmallVector<SmallString<128>, 2> NewIncFlags;
236 rewriteIncludes(Args, i, NumArgs, NewIncFlags);
237 if (!NewIncFlags.empty()) {
238 for (auto &F : NewIncFlags) {
239 OS << ' ';
240 llvm::sys::printArg(OS, F.c_str(), Quote);
241 }
242 i += NumArgs - 1;
243 continue;
244 }
245 }
246
247 auto Found = llvm::find_if(InputInfoList, [&Arg](const InputInfo &II) {
248 return II.getFilename() == Arg;
249 });
250 if (Found != InputInfoList.end() &&
251 (i == 0 || StringRef(Args[i - 1]) != "-main-file-name")) {
252 // Replace the input file name with the crashinfo's file name.
253 OS << ' ';
254 StringRef ShortName = llvm::sys::path::filename(CrashInfo->Filename);
255 llvm::sys::printArg(OS, ShortName.str(), Quote);
256 continue;
257 }
258 }
259
260 OS << ' ';
261 llvm::sys::printArg(OS, Arg, Quote);
262 }
263
264 if (CrashInfo && HaveCrashVFS) {
265 OS << ' ';
266 llvm::sys::printArg(OS, "-ivfsoverlay", Quote);
267 OS << ' ';
268 llvm::sys::printArg(OS, CrashInfo->VFSPath.str(), Quote);
269
270 // The leftover modules from the crash are stored in
271 // <name>.cache/vfs/modules
272 // Leave it untouched for pcm inspection and provide a clean/empty dir
273 // path to contain the future generated module cache:
274 // <name>.cache/vfs/repro-modules
275 SmallString<128> RelModCacheDir = llvm::sys::path::parent_path(
276 llvm::sys::path::parent_path(CrashInfo->VFSPath));
277 llvm::sys::path::append(RelModCacheDir, "repro-modules");
278
279 std::string ModCachePath = "-fmodules-cache-path=";
280 ModCachePath.append(RelModCacheDir.c_str());
281
282 OS << ' ';
283 llvm::sys::printArg(OS, ModCachePath, Quote);
284 }
285
286 if (ResponseFile != nullptr) {
287 OS << "\n Arguments passed via response file:\n";
288 writeResponseFile(OS);
289 // Avoiding duplicated newline terminator, since FileLists are
290 // newline-separated.
291 if (ResponseSupport.ResponseKind != ResponseFileSupport::RF_FileList)
292 OS << "\n";
293 OS << " (end of response file)";
294 }
295
296 OS << Terminator;
297}
298
300 ResponseFile = FileName;
301 ResponseFileFlag = ResponseSupport.ResponseFlag;
302 ResponseFileFlag += FileName;
303}
304
306 Environment.reserve(NewEnvironment.size() + 1);
307 Environment.assign(NewEnvironment.begin(), NewEnvironment.end());
308 Environment.push_back(nullptr);
309}
310
312 const std::vector<std::optional<std::string>> &Redirects) {
313 RedirectFiles = Redirects;
314}
315
318 for (const auto &Arg : InputInfoList)
319 llvm::outs() << llvm::sys::path::filename(Arg.getFilename()) << "\n";
320 llvm::outs().flush();
321 }
322}
323
324int Command::Execute(ArrayRef<std::optional<StringRef>> Redirects,
325 std::string *ErrMsg, bool *ExecutionFailed) const {
327
329 if (ResponseFile == nullptr) {
330 Argv.push_back(Executable);
331 if (PrependArg)
332 Argv.push_back(PrependArg);
333 Argv.append(Arguments.begin(), Arguments.end());
334 Argv.push_back(nullptr);
335 } else {
336 // If the command is too large, we need to put arguments in a response file.
337 std::string RespContents;
338 llvm::raw_string_ostream SS(RespContents);
339
340 // Write file contents and build the Argv vector
341 writeResponseFile(SS);
342 buildArgvForResponseFile(Argv);
343 Argv.push_back(nullptr);
344
345 // Save the response file in the appropriate encoding
346 if (std::error_code EC = writeFileWithEncoding(
347 ResponseFile, RespContents, ResponseSupport.ResponseEncoding)) {
348 if (ErrMsg)
349 *ErrMsg = EC.message();
350 if (ExecutionFailed)
351 *ExecutionFailed = true;
352 // Return -1 by convention (see llvm/include/llvm/Support/Program.h) to
353 // indicate the requested executable cannot be started.
354 return -1;
355 }
356 }
357
358 std::optional<ArrayRef<StringRef>> Env;
359 std::vector<StringRef> ArgvVectorStorage;
360 if (!Environment.empty()) {
361 assert(Environment.back() == nullptr &&
362 "Environment vector should be null-terminated by now");
363 ArgvVectorStorage = llvm::toStringRefArray(Environment.data());
364 Env = ArrayRef(ArgvVectorStorage);
365 }
366
367 auto Args = llvm::toStringRefArray(Argv.data());
368
369 // Use Job-specific redirect files if they are present.
370 if (!RedirectFiles.empty()) {
371 std::vector<std::optional<StringRef>> RedirectFilesOptional;
372 for (const auto &Ele : RedirectFiles)
373 if (Ele)
374 RedirectFilesOptional.push_back(std::optional<StringRef>(*Ele));
375 else
376 RedirectFilesOptional.push_back(std::nullopt);
377
378 return llvm::sys::ExecuteAndWait(Executable, Args, Env,
379 ArrayRef(RedirectFilesOptional),
380 /*secondsToWait=*/0, /*memoryLimit=*/0,
381 ErrMsg, ExecutionFailed, &ProcStat);
382 }
383
384 return llvm::sys::ExecuteAndWait(Executable, Args, Env, Redirects,
385 /*secondsToWait*/ 0, /*memoryLimit*/ 0,
386 ErrMsg, ExecutionFailed, &ProcStat);
387}
388
389CC1Command::CC1Command(const Action &Source, const Tool &Creator,
390 ResponseFileSupport ResponseSupport,
391 const char *Executable,
392 const llvm::opt::ArgStringList &Arguments,
394 const char *PrependArg)
395 : Command(Source, Creator, ResponseSupport, Executable, Arguments, Inputs,
396 Outputs, PrependArg) {
397 InProcess = true;
398}
399
400void CC1Command::Print(raw_ostream &OS, const char *Terminator, bool Quote,
401 CrashReportInfo *CrashInfo) const {
402 if (InProcess)
403 OS << " (in-process)\n";
404 Command::Print(OS, Terminator, Quote, CrashInfo);
405}
406
407int CC1Command::Execute(ArrayRef<std::optional<StringRef>> Redirects,
408 std::string *ErrMsg, bool *ExecutionFailed) const {
409 // FIXME: Currently, if there're more than one job, we disable
410 // -fintegrate-cc1. If we're no longer a integrated-cc1 job, fallback to
411 // out-of-process execution. See discussion in https://reviews.llvm.org/D74447
412 if (!InProcess)
413 return Command::Execute(Redirects, ErrMsg, ExecutionFailed);
414
416
418 Argv.push_back(getExecutable());
419 Argv.append(getArguments().begin(), getArguments().end());
420 Argv.push_back(nullptr);
421 Argv.pop_back(); // The terminating null element shall not be part of the
422 // slice (main() behavior).
423
424 // This flag simply indicates that the program couldn't start, which isn't
425 // applicable here.
426 if (ExecutionFailed)
427 *ExecutionFailed = false;
428
429 llvm::CrashRecoveryContext CRC;
430 CRC.DumpStackAndCleanupOnFailure = true;
431
432 const void *PrettyState = llvm::SavePrettyStackState();
433 const Driver &D = getCreator().getToolChain().