1 //===- Compilation.cpp - Compilation Task Implementation ------------------===//
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/Compilation.h"
10 #include "clang/Basic/LLVM.h"
11 #include "clang/Driver/Action.h"
12 #include "clang/Driver/Driver.h"
13 #include "clang/Driver/DriverDiagnostic.h"
14 #include "clang/Driver/Job.h"
15 #include "clang/Driver/Options.h"
16 #include "clang/Driver/ToolChain.h"
17 #include "clang/Driver/Util.h"
18 #include "llvm/ADT/None.h"
19 #include "llvm/ADT/STLExtras.h"
20 #include "llvm/ADT/SmallVector.h"
21 #include "llvm/ADT/Triple.h"
22 #include "llvm/Option/ArgList.h"
23 #include "llvm/Option/OptSpecifier.h"
24 #include "llvm/Option/Option.h"
25 #include "llvm/Support/FileSystem.h"
26 #include "llvm/Support/raw_ostream.h"
27 #include <cassert>
28 #include <string>
29 #include <system_error>
30 #include <utility>
31 
32 using namespace clang;
33 using namespace driver;
34 using namespace llvm::opt;
35 
36 Compilation::Compilation(const Driver &D, const ToolChain &_DefaultToolChain,
37                          InputArgList *_Args, DerivedArgList *_TranslatedArgs,
38                          bool ContainsError)
39     : TheDriver(D), DefaultToolChain(_DefaultToolChain), Args(_Args),
40       TranslatedArgs(_TranslatedArgs), ContainsError(ContainsError) {
41   // The offloading host toolchain is the default toolchain.
42   OrderedOffloadingToolchains.insert(
43       std::make_pair(Action::OFK_Host, &DefaultToolChain));
44 }
45 
46 Compilation::~Compilation() {
47   // Remove temporary files. This must be done before arguments are freed, as
48   // the file names might be derived from the input arguments.
49   if (!TheDriver.isSaveTempsEnabled() && !ForceKeepTempFiles)
50     CleanupFileList(TempFiles);
51 
52   delete TranslatedArgs;
53   delete Args;
54 
55   // Free any derived arg lists.
56   for (auto Arg : TCArgs)
57     if (Arg.second != TranslatedArgs)
58       delete Arg.second;
59 }
60 
61 const DerivedArgList &
62 Compilation::getArgsForToolChain(const ToolChain *TC, StringRef BoundArch,
63                                  Action::OffloadKind DeviceOffloadKind) {
64   if (!TC)
65     TC = &DefaultToolChain;
66 
67   DerivedArgList *&Entry = TCArgs[{TC, BoundArch, DeviceOffloadKind}];
68   if (!Entry) {
69     SmallVector<Arg *, 4> AllocatedArgs;
70     DerivedArgList *OpenMPArgs = nullptr;
71     // Translate OpenMP toolchain arguments provided via the -Xopenmp-target flags.
72     if (DeviceOffloadKind == Action::OFK_OpenMP) {
73       const ToolChain *HostTC = getSingleOffloadToolChain<Action::OFK_Host>();
74       bool SameTripleAsHost = (TC->getTriple() == HostTC->getTriple());
75       OpenMPArgs = TC->TranslateOpenMPTargetArgs(
76           *TranslatedArgs, SameTripleAsHost, AllocatedArgs);
77     }
78 
79     DerivedArgList *NewDAL = nullptr;
80     if (!OpenMPArgs) {
81       NewDAL = TC->TranslateXarchArgs(*TranslatedArgs, BoundArch,
82                                       DeviceOffloadKind, &AllocatedArgs);
83     } else {
84       NewDAL = TC->TranslateXarchArgs(*OpenMPArgs, BoundArch, DeviceOffloadKind,
85                                       &AllocatedArgs);
86       if (!NewDAL)
87         NewDAL = OpenMPArgs;
88       else
89         delete OpenMPArgs;
90     }
91 
92     if (!NewDAL) {
93       Entry = TC->TranslateArgs(*TranslatedArgs, BoundArch, DeviceOffloadKind);
94       if (!Entry)
95         Entry = TranslatedArgs;
96     } else {
97       Entry = TC->TranslateArgs(*NewDAL, BoundArch, DeviceOffloadKind);
98       if (!Entry)
99         Entry = NewDAL;
100       else
101         delete NewDAL;
102     }
103 
104     // Add allocated arguments to the final DAL.
105     for (auto ArgPtr : AllocatedArgs)
106       Entry->AddSynthesizedArg(ArgPtr);
107   }
108 
109   return *Entry;
110 }
111 
112 bool Compilation::CleanupFile(const char *File, bool IssueErrors) const {
113   // FIXME: Why are we trying to remove files that we have not created? For
114   // example we should only try to remove a temporary assembly file if
115   // "clang -cc1" succeed in writing it. Was this a workaround for when
116   // clang was writing directly to a .s file and sometimes leaving it behind
117   // during a failure?
118 
119   // FIXME: If this is necessary, we can still try to split
120   // llvm::sys::fs::remove into a removeFile and a removeDir and avoid the
121   // duplicated stat from is_regular_file.
122 
123   // Don't try to remove files which we don't have write access to (but may be
124   // able to remove), or non-regular files. Underlying tools may have
125   // intentionally not overwritten them.
126   if (!llvm::sys::fs::can_write(File) || !llvm::sys::fs::is_regular_file(File))
127     return true;
128 
129   if (std::error_code EC = llvm::sys::fs::remove(File)) {
130     // Failure is only failure if the file exists and is "regular". We checked
131     // for it being regular before, and llvm::sys::fs::remove ignores ENOENT,
132     // so we don't need to check again.
133 
134     if (IssueErrors)
135       getDriver().Diag(diag::err_drv_unable_to_remove_file)
136         << EC.message();
137     return false;
138   }
139   return true;
140 }
141 
142 bool Compilation::CleanupFileList(const llvm::opt::ArgStringList &Files,
143                                   bool IssueErrors) const {
144   bool Success = true;
145   for (const auto &File: Files)
146     Success &= CleanupFile(File, IssueErrors);
147   return Success;
148 }
149 
150 bool Compilation::CleanupFileMap(const ArgStringMap &Files,
151                                  const JobAction *JA,
152                                  bool IssueErrors) const {
153   bool Success = true;
154   for (const auto &File : Files) {
155     // If specified, only delete the files associated with the JobAction.
156     // Otherwise, delete all files in the map.
157     if (JA && File.first != JA)
158       continue;
159     Success &= CleanupFile(File.second, IssueErrors);
160   }
161   return Success;
162 }
163 
164 int Compilation::ExecuteCommand(const Command &C,
165                                 const Command *&FailingCommand) const {
166   if ((getDriver().CCPrintOptions ||
167        getArgs().hasArg(options::OPT_v)) && !getDriver().CCGenDiagnostics) {
168     raw_ostream *OS = &llvm::errs();
169     std::unique_ptr<llvm::raw_fd_ostream> OwnedStream;
170 
171     // Follow gcc implementation of CC_PRINT_OPTIONS; we could also cache the
172     // output stream.
173     if (getDriver().CCPrintOptions &&
174         !getDriver().CCPrintOptionsFilename.empty()) {
175       std::error_code EC;
176       OwnedStream.reset(new llvm::raw_fd_ostream(
177           getDriver().CCPrintOptionsFilename, EC,
178           llvm::sys::fs::OF_Append | llvm::sys::fs::OF_TextWithCRLF));
179       if (EC) {
180         getDriver().Diag(diag::err_drv_cc_print_options_failure)
181             << EC.message();
182         FailingCommand = &C;
183         return 1;
184       }
185       OS = OwnedStream.get();
186     }
187 
188     if (getDriver().CCPrintOptions)
189       *OS << "[Logging clang options]\n";
190 
191     C.Print(*OS, "\n", /*Quote=*/getDriver().CCPrintOptions);
192   }
193 
194   std::string Error;
195   bool ExecutionFailed;
196   int Res = C.Execute(Redirects, &Error, &ExecutionFailed);
197   if (PostCallback)
198     PostCallback(C, Res);
199   if (!Error.empty()) {
200     assert(Res && "Error string set with 0 result code!");
201     getDriver().Diag(diag::err_drv_command_failure) << Error;
202   }
203 
204   if (Res)
205     FailingCommand = &C;
206 
207   return ExecutionFailed ? 1 : Res;
208 }
209 
210 using FailingCommandList = SmallVectorImpl<std::pair<int, const Command *>>;
211 
212 static bool ActionFailed(const Action *A,
213                          const FailingCommandList &FailingCommands) {
214   if (FailingCommands.empty())
215     return false;
216 
217   // CUDA/HIP can have the same input source code compiled multiple times so do
218   // not compiled again if there are already failures. It is OK to abort the
219   // CUDA pipeline on errors.
220   if (A->isOffloading(Action::OFK_Cuda) || A->isOffloading(Action::OFK_HIP))
221     return true;
222 
223   for (const auto &CI : FailingCommands)
224     if (A == &(CI.second->getSource()))
225       return true;
226 
227   for (const auto *AI : A->inputs())
228     if (ActionFailed(AI, FailingCommands))
229       return true;
230 
231   return false;
232 }
233 
234 static bool InputsOk(const Command &C,
235                      const FailingCommandList &FailingCommands) {
236   return !ActionFailed(&C.getSource(), FailingCommands);
237 }
238 
239 void Compilation::ExecuteJobs(const JobList &Jobs,
240                               FailingCommandList &FailingCommands) const {
241   // According to UNIX standard, driver need to continue compiling all the
242   // inputs on the command line even one of them failed.
243   // In all but CLMode, execute all the jobs unless the necessary inputs for the
244   // job is missing due to previous failures.
245   for (const auto &Job : Jobs) {
246     if (!InputsOk(Job, FailingCommands))
247       continue;
248     const Command *FailingCommand = nullptr;
249     if (int Res = ExecuteCommand(Job, FailingCommand)) {
250       FailingCommands.push_back(std::make_pair(Res, FailingCommand));
251       // Bail as soon as one command fails in cl driver mode.
252       if (TheDriver.IsCLMode())
253         return;
254     }
255   }
256 }
257 
258 void Compilation::initCompilationForDiagnostics() {
259   ForDiagnostics = true;
260 
261   // Free actions and jobs.
262   Actions.clear();
263   AllActions.clear();
264   Jobs.clear();
265 
266   // Remove temporary files.
267   if (!TheDriver.isSaveTempsEnabled() && !ForceKeepTempFiles)
268     CleanupFileList(TempFiles);
269 
270   // Clear temporary/results file lists.
271   TempFiles.clear();
272   ResultFiles.clear();
273   FailureResultFiles.clear();
274 
275   // Remove any user specified output.  Claim any unclaimed arguments, so as
276   // to avoid emitting warnings about unused args.
277   OptSpecifier OutputOpts[] = {
278       options::OPT_o,  options::OPT_MD, options::OPT_MMD, options::OPT_M,
279       options::OPT_MM, options::OPT_MF, options::OPT_MG,  options::OPT_MJ,
280       options::OPT_MQ, options::OPT_MT, options::OPT_MV};
281   for (unsigned i = 0, e = llvm::array_lengthof(OutputOpts); i != e; ++i) {
282     if (TranslatedArgs->hasArg(OutputOpts[i]))
283       TranslatedArgs->eraseArg(OutputOpts[i]);
284   }
285   TranslatedArgs->ClaimAllArgs();
286 
287   // Force re-creation of the toolchain Args, otherwise our modifications just
288   // above will have no effect.
289   for (auto Arg : TCArgs)
290     if (Arg.second != TranslatedArgs)
291       delete Arg.second;
292   TCArgs.clear();
293 
294   // Redirect stdout/stderr to /dev/null.
295   Redirects = {None, {""}, {""}};
296 
297   // Temporary files added by diagnostics should be kept.
298   ForceKeepTempFiles = true;
299 }
300 
301 StringRef Compilation::getSysRoot() const {
302   return getDriver().SysRoot;
303 }
304 
305 void Compilation::Redirect(ArrayRef<Optional<StringRef>> Redirects) {
306   this->Redirects = Redirects;
307 }
308