Bug Summary

File:clang/lib/Driver/ToolChains/CommonArgs.cpp
Warning:line 1870, column 7
Forming reference to null pointer

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name CommonArgs.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mframe-pointer=none -relaxed-aliasing -fmath-errno -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/llvm-toolchain-snapshot-14~++20211016100712+8e1d532707fd/build-llvm -resource-dir /usr/lib/llvm-14/lib/clang/14.0.0 -D CLANG_ROUND_TRIP_CC1_ARGS=ON -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I tools/clang/lib/Driver -I /build/llvm-toolchain-snapshot-14~++20211016100712+8e1d532707fd/clang/lib/Driver -I /build/llvm-toolchain-snapshot-14~++20211016100712+8e1d532707fd/clang/include -I tools/clang/include -I include -I /build/llvm-toolchain-snapshot-14~++20211016100712+8e1d532707fd/llvm/include -D NDEBUG -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/x86_64-linux-gnu/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/backward -internal-isystem /usr/lib/llvm-14/lib/clang/14.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-command-line-argument -Wno-unknown-warning-option -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/build/llvm-toolchain-snapshot-14~++20211016100712+8e1d532707fd/build-llvm -ferror-limit 19 -fvisibility-inlines-hidden -fgnuc-version=4.2.1 -fcolor-diagnostics -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2021-10-17-004846-21170-1 -x c++ /build/llvm-toolchain-snapshot-14~++20211016100712+8e1d532707fd/clang/lib/Driver/ToolChains/CommonArgs.cpp
1//===--- CommonArgs.cpp - Args handling for multiple toolchains -*- 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#include "CommonArgs.h"
10#include "Arch/AArch64.h"
11#include "Arch/ARM.h"
12#include "Arch/M68k.h"
13#include "Arch/Mips.h"
14#include "Arch/PPC.h"
15#include "Arch/SystemZ.h"
16#include "Arch/VE.h"
17#include "Arch/X86.h"
18#include "HIP.h"
19#include "Hexagon.h"
20#include "clang/Basic/CharInfo.h"
21#include "clang/Basic/LangOptions.h"
22#include "clang/Basic/ObjCRuntime.h"
23#include "clang/Basic/Version.h"
24#include "clang/Config/config.h"
25#include "clang/Driver/Action.h"
26#include "clang/Driver/Compilation.h"
27#include "clang/Driver/Driver.h"
28#include "clang/Driver/DriverDiagnostic.h"
29#include "clang/Driver/InputInfo.h"
30#include "clang/Driver/Job.h"
31#include "clang/Driver/Options.h"
32#include "clang/Driver/SanitizerArgs.h"
33#include "clang/Driver/ToolChain.h"
34#include "clang/Driver/Util.h"
35#include "clang/Driver/XRayArgs.h"
36#include "llvm/ADT/STLExtras.h"
37#include "llvm/ADT/SmallSet.h"
38#include "llvm/ADT/SmallString.h"
39#include "llvm/ADT/StringExtras.h"
40#include "llvm/ADT/StringSwitch.h"
41#include "llvm/ADT/Twine.h"
42#include "llvm/Config/llvm-config.h"
43#include "llvm/Option/Arg.h"
44#include "llvm/Option/ArgList.h"
45#include "llvm/Option/Option.h"
46#include "llvm/Support/CodeGen.h"
47#include "llvm/Support/Compression.h"
48#include "llvm/Support/Debug.h"
49#include "llvm/Support/ErrorHandling.h"
50#include "llvm/Support/FileSystem.h"
51#include "llvm/Support/Host.h"
52#include "llvm/Support/Path.h"
53#include "llvm/Support/Process.h"
54#include "llvm/Support/Program.h"
55#include "llvm/Support/ScopedPrinter.h"
56#include "llvm/Support/TargetParser.h"
57#include "llvm/Support/Threading.h"
58#include "llvm/Support/VirtualFileSystem.h"
59#include "llvm/Support/YAMLParser.h"
60
61using namespace clang::driver;
62using namespace clang::driver::tools;
63using namespace clang;
64using namespace llvm::opt;
65
66static void renderRpassOptions(const ArgList &Args, ArgStringList &CmdArgs) {
67 if (const Arg *A = Args.getLastArg(options::OPT_Rpass_EQ))
68 CmdArgs.push_back(Args.MakeArgString(Twine("--plugin-opt=-pass-remarks=") +
69 A->getValue()));
70
71 if (const Arg *A = Args.getLastArg(options::OPT_Rpass_missed_EQ))
72 CmdArgs.push_back(Args.MakeArgString(
73 Twine("--plugin-opt=-pass-remarks-missed=") + A->getValue()));
74
75 if (const Arg *A = Args.getLastArg(options::OPT_Rpass_analysis_EQ))
76 CmdArgs.push_back(Args.MakeArgString(
77 Twine("--plugin-opt=-pass-remarks-analysis=") + A->getValue()));
78}
79
80static void renderRemarksOptions(const ArgList &Args, ArgStringList &CmdArgs,
81 const llvm::Triple &Triple,
82 const InputInfo &Input,
83 const InputInfo &Output) {
84 StringRef Format = "yaml";
85 if (const Arg *A = Args.getLastArg(options::OPT_fsave_optimization_record_EQ))
86 Format = A->getValue();
87
88 SmallString<128> F;
89 const Arg *A = Args.getLastArg(options::OPT_foptimization_record_file_EQ);
90 if (A)
91 F = A->getValue();
92 else if (Output.isFilename())
93 F = Output.getFilename();
94
95 assert(!F.empty() && "Cannot determine remarks output name.")(static_cast <bool> (!F.empty() && "Cannot determine remarks output name."
) ? void (0) : __assert_fail ("!F.empty() && \"Cannot determine remarks output name.\""
, "/build/llvm-toolchain-snapshot-14~++20211016100712+8e1d532707fd/clang/lib/Driver/ToolChains/CommonArgs.cpp"
, 95, __extension__ __PRETTY_FUNCTION__))
;
96 // Append "opt.ld.<format>" to the end of the file name.
97 CmdArgs.push_back(
98 Args.MakeArgString(Twine("--plugin-opt=opt-remarks-filename=") + F +
99 Twine(".opt.ld.") + Format));
100
101 if (const Arg *A =
102 Args.getLastArg(options::OPT_foptimization_record_passes_EQ))
103 CmdArgs.push_back(Args.MakeArgString(
104 Twine("--plugin-opt=opt-remarks-passes=") + A->getValue()));
105
106 CmdArgs.push_back(Args.MakeArgString(
107 Twine("--plugin-opt=opt-remarks-format=") + Format.data()));
108}
109
110static void renderRemarksHotnessOptions(const ArgList &Args,
111 ArgStringList &CmdArgs) {
112 if (Args.hasFlag(options::OPT_fdiagnostics_show_hotness,
113 options::OPT_fno_diagnostics_show_hotness, false))
114 CmdArgs.push_back("--plugin-opt=opt-remarks-with-hotness");
115
116 if (const Arg *A =
117 Args.getLastArg(options::OPT_fdiagnostics_hotness_threshold_EQ))
118 CmdArgs.push_back(Args.MakeArgString(
119 Twine("--plugin-opt=opt-remarks-hotness-threshold=") + A->getValue()));
120}
121
122void tools::addPathIfExists(const Driver &D, const Twine &Path,
123 ToolChain::path_list &Paths) {
124 if (D.getVFS().exists(Path))
125 Paths.push_back(Path.str());
126}
127
128void tools::handleTargetFeaturesGroup(const ArgList &Args,
129 std::vector<StringRef> &Features,
130 OptSpecifier Group) {
131 for (const Arg *A : Args.filtered(Group)) {
132 StringRef Name = A->getOption().getName();
133 A->claim();
134
135 // Skip over "-m".
136 assert(Name.startswith("m") && "Invalid feature name.")(static_cast <bool> (Name.startswith("m") && "Invalid feature name."
) ? void (0) : __assert_fail ("Name.startswith(\"m\") && \"Invalid feature name.\""
, "/build/llvm-toolchain-snapshot-14~++20211016100712+8e1d532707fd/clang/lib/Driver/ToolChains/CommonArgs.cpp"
, 136, __extension__ __PRETTY_FUNCTION__))
;
137 Name = Name.substr(1);
138
139 bool IsNegative = Name.startswith("no-");
140 if (IsNegative)
141 Name = Name.substr(3);
142 Features.push_back(Args.MakeArgString((IsNegative ? "-" : "+") + Name));
143 }
144}
145
146std::vector<StringRef>
147tools::unifyTargetFeatures(const std::vector<StringRef> &Features) {
148 std::vector<StringRef> UnifiedFeatures;
149 // Find the last of each feature.
150 llvm::StringMap<unsigned> LastOpt;
151 for (unsigned I = 0, N = Features.size(); I < N; ++I) {
152 StringRef Name = Features[I];
153 assert(Name[0] == '-' || Name[0] == '+')(static_cast <bool> (Name[0] == '-' || Name[0] == '+') ?
void (0) : __assert_fail ("Name[0] == '-' || Name[0] == '+'"
, "/build/llvm-toolchain-snapshot-14~++20211016100712+8e1d532707fd/clang/lib/Driver/ToolChains/CommonArgs.cpp"
, 153, __extension__ __PRETTY_FUNCTION__))
;
154 LastOpt[Name.drop_front(1)] = I;
155 }
156
157 for (unsigned I = 0, N = Features.size(); I < N; ++I) {
158 // If this feature was overridden, ignore it.
159 StringRef Name = Features[I];
160 llvm::StringMap<unsigned>::iterator LastI = LastOpt.find(Name.drop_front(1));
161 assert(LastI != LastOpt.end())(static_cast <bool> (LastI != LastOpt.end()) ? void (0)
: __assert_fail ("LastI != LastOpt.end()", "/build/llvm-toolchain-snapshot-14~++20211016100712+8e1d532707fd/clang/lib/Driver/ToolChains/CommonArgs.cpp"
, 161, __extension__ __PRETTY_FUNCTION__))
;
162 unsigned Last = LastI->second;
163 if (Last != I)
164 continue;
165
166 UnifiedFeatures.push_back(Name);
167 }
168 return UnifiedFeatures;
169}
170
171void tools::addDirectoryList(const ArgList &Args, ArgStringList &CmdArgs,
172 const char *ArgName, const char *EnvVar) {
173 const char *DirList = ::getenv(EnvVar);
174 bool CombinedArg = false;
175
176 if (!DirList)
177 return; // Nothing to do.
178
179 StringRef Name(ArgName);
180 if (Name.equals("-I") || Name.equals("-L") || Name.empty())
181 CombinedArg = true;
182
183 StringRef Dirs(DirList);
184 if (Dirs.empty()) // Empty string should not add '.'.
185 return;
186
187 StringRef::size_type Delim;
188 while ((Delim = Dirs.find(llvm::sys::EnvPathSeparator)) != StringRef::npos) {
189 if (Delim == 0) { // Leading colon.
190 if (CombinedArg) {
191 CmdArgs.push_back(Args.MakeArgString(std::string(ArgName) + "."));
192 } else {
193 CmdArgs.push_back(ArgName);
194 CmdArgs.push_back(".");
195 }
196 } else {
197 if (CombinedArg) {
198 CmdArgs.push_back(
199 Args.MakeArgString(std::string(ArgName) + Dirs.substr(0, Delim)));
200 } else {
201 CmdArgs.push_back(ArgName);
202 CmdArgs.push_back(Args.MakeArgString(Dirs.substr(0, Delim)));
203 }
204 }
205 Dirs = Dirs.substr(Delim + 1);
206 }
207
208 if (Dirs.empty()) { // Trailing colon.
209 if (CombinedArg) {
210 CmdArgs.push_back(Args.MakeArgString(std::string(ArgName) + "."));
211 } else {
212 CmdArgs.push_back(ArgName);
213 CmdArgs.push_back(".");
214 }
215 } else { // Add the last path.
216 if (CombinedArg) {
217 CmdArgs.push_back(Args.MakeArgString(std::string(ArgName) + Dirs));
218 } else {
219 CmdArgs.push_back(ArgName);
220 CmdArgs.push_back(Args.MakeArgString(Dirs));
221 }
222 }
223}
224
225void tools::AddLinkerInputs(const ToolChain &TC, const InputInfoList &Inputs,
226 const ArgList &Args, ArgStringList &CmdArgs,
227 const JobAction &JA) {
228 const Driver &D = TC.getDriver();
229
230 // Add extra linker input arguments which are not treated as inputs
231 // (constructed via -Xarch_).
232 Args.AddAllArgValues(CmdArgs, options::OPT_Zlinker_input);
233
234 // LIBRARY_PATH are included before user inputs and only supported on native
235 // toolchains.
236 if (!TC.isCrossCompiling())
237 addDirectoryList(Args, CmdArgs, "-L", "LIBRARY_PATH");
238
239 for (const auto &II : Inputs) {
240 // If the current tool chain refers to an OpenMP offloading host, we
241 // should ignore inputs that refer to OpenMP offloading devices -
242 // they will be embedded according to a proper linker script.
243 if (auto *IA = II.getAction())
244 if ((JA.isHostOffloading(Action::OFK_OpenMP) &&
245 IA->isDeviceOffloading(Action::OFK_OpenMP)))
246 continue;
247
248 if (!TC.HasNativeLLVMSupport() && types::isLLVMIR(II.getType()))
249 // Don't try to pass LLVM inputs unless we have native support.
250 D.Diag(diag::err_drv_no_linker_llvm_support) << TC.getTripleString();
251
252 // Add filenames immediately.
253 if (II.isFilename()) {
254 CmdArgs.push_back(II.getFilename());
255 continue;
256 }
257
258 // Otherwise, this is a linker input argument.
259 const Arg &A = II.getInputArg();
260
261 // Handle reserved library options.
262 if (A.getOption().matches(options::OPT_Z_reserved_lib_stdcxx))
263 TC.AddCXXStdlibLibArgs(Args, CmdArgs);
264 else if (A.getOption().matches(options::OPT_Z_reserved_lib_cckext))
265 TC.AddCCKextLibArgs(Args, CmdArgs);
266 else if (A.getOption().matches(options::OPT_z)) {
267 // Pass -z prefix for gcc linker compatibility.
268 A.claim();
269 A.render(Args, CmdArgs);
270 } else if (A.getOption().matches(options::OPT_b)) {
271 const llvm::Triple &T = TC.getTriple();
272 if (!T.isOSAIX()) {
273 TC.getDriver().Diag(diag::err_drv_unsupported_opt_for_target)
274 << A.getSpelling() << T.str();
275 }
276 // Pass -b prefix for AIX linker.
277 A.claim();
278 A.render(Args, CmdArgs);
279 } else {
280 A.renderAsInput(Args, CmdArgs);
281 }
282 }
283}
284
285void tools::addLinkerCompressDebugSectionsOption(
286 const ToolChain &TC, const llvm::opt::ArgList &Args,
287 llvm::opt::ArgStringList &CmdArgs) {
288 // GNU ld supports --compress-debug-sections=none|zlib|zlib-gnu|zlib-gabi
289 // whereas zlib is an alias to zlib-gabi. Therefore -gz=none|zlib|zlib-gnu
290 // are translated to --compress-debug-sections=none|zlib|zlib-gnu.
291 // -gz is not translated since ld --compress-debug-sections option requires an
292 // argument.
293 if (const Arg *A = Args.getLastArg(options::OPT_gz_EQ)) {
294 StringRef V = A->getValue();
295 if (V == "none" || V == "zlib" || V == "zlib-gnu")
296 CmdArgs.push_back(Args.MakeArgString("--compress-debug-sections=" + V));
297 else
298 TC.getDriver().Diag(diag::err_drv_unsupported_option_argument)
299 << A->getOption().getName() << V;
300 }
301}
302
303void tools::AddTargetFeature(const ArgList &Args,
304 std::vector<StringRef> &Features,
305 OptSpecifier OnOpt, OptSpecifier OffOpt,
306 StringRef FeatureName) {
307 if (Arg *A = Args.getLastArg(OnOpt, OffOpt)) {
308 if (A->getOption().matches(OnOpt))
309 Features.push_back(Args.MakeArgString("+" + FeatureName));
310 else
311 Features.push_back(Args.MakeArgString("-" + FeatureName));
312 }
313}
314
315/// Get the (LLVM) name of the AMDGPU gpu we are targeting.
316static std::string getAMDGPUTargetGPU(const llvm::Triple &T,
317 const ArgList &Args) {
318 if (Arg *A = Args.getLastArg(options::OPT_mcpu_EQ)) {
319 auto GPUName = getProcessorFromTargetID(T, A->getValue());
320 return llvm::StringSwitch<std::string>(GPUName)
321 .Cases("rv630", "rv635", "r600")
322 .Cases("rv610", "rv620", "rs780", "rs880")
323 .Case("rv740", "rv770")
324 .Case("palm", "cedar")
325 .Cases("sumo", "sumo2", "sumo")
326 .Case("hemlock", "cypress")
327 .Case("aruba", "cayman")
328 .Default(GPUName.str());
329 }
330 return "";
331}
332
333static std::string getLanaiTargetCPU(const ArgList &Args) {
334 if (Arg *A = Args.getLastArg(options::OPT_mcpu_EQ)) {
335 return A->getValue();
336 }
337 return "";
338}
339
340/// Get the (LLVM) name of the WebAssembly cpu we are targeting.
341static StringRef getWebAssemblyTargetCPU(const ArgList &Args) {
342 // If we have -mcpu=, use that.
343 if (Arg *A = Args.getLastArg(options::OPT_mcpu_EQ)) {
344 StringRef CPU = A->getValue();
345
346#ifdef __wasm__
347 // Handle "native" by examining the host. "native" isn't meaningful when
348 // cross compiling, so only support this when the host is also WebAssembly.
349 if (CPU == "native")
350 return llvm::sys::getHostCPUName();
351#endif
352
353 return CPU;
354 }
355
356 return "generic";
357}
358
359std::string tools::getCPUName(const Driver &D, const ArgList &Args,
360 const llvm::Triple &T, bool FromAs) {
361 Arg *A;
362
363 switch (T.getArch()) {
364 default:
365 return "";
366
367 case llvm::Triple::aarch64:
368 case llvm::Triple::aarch64_32:
369 case llvm::Triple::aarch64_be:
370 return aarch64::getAArch64TargetCPU(Args, T, A);
371
372 case llvm::Triple::arm:
373 case llvm::Triple::armeb:
374 case llvm::Triple::thumb:
375 case llvm::Triple::thumbeb: {
376 StringRef MArch, MCPU;
377 arm::getARMArchCPUFromArgs(Args, MArch, MCPU, FromAs);
378 return arm::getARMTargetCPU(MCPU, MArch, T);
379 }
380
381 case llvm::Triple::avr:
382 if (const Arg *A = Args.getLastArg(options::OPT_mmcu_EQ))
383 return A->getValue();
384 return "";
385
386 case llvm::Triple::m68k:
387 return m68k::getM68kTargetCPU(Args);
388
389 case llvm::Triple::mips:
390 case llvm::Triple::mipsel:
391 case llvm::Triple::mips64:
392 case llvm::Triple::mips64el: {
393 StringRef CPUName;
394 StringRef ABIName;
395 mips::getMipsCPUAndABI(Args, T, CPUName, ABIName);
396 return std::string(CPUName);
397 }
398
399 case llvm::Triple::nvptx:
400 case llvm::Triple::nvptx64:
401 if (const Arg *A = Args.getLastArg(options::OPT_march_EQ))
402 return A->getValue();
403 return "";
404
405 case llvm::Triple::ppc:
406 case llvm::Triple::ppcle:
407 case llvm::Triple::ppc64:
408 case llvm::Triple::ppc64le: {
409 std::string TargetCPUName = ppc::getPPCTargetCPU(Args);
410 // LLVM may default to generating code for the native CPU,
411 // but, like gcc, we default to a more generic option for
412 // each architecture. (except on AIX)
413 if (!TargetCPUName.empty())
414 return TargetCPUName;
415
416 if (T.isOSAIX())
417 TargetCPUName = "pwr7";
418 else if (T.getArch() == llvm::Triple::ppc64le)
419 TargetCPUName = "ppc64le";
420 else if (T.getArch() == llvm::Triple::ppc64)
421 TargetCPUName = "ppc64";
422 else
423 TargetCPUName = "ppc";
424
425 return TargetCPUName;
426 }
427 case llvm::Triple::riscv32:
428 case llvm::Triple::riscv64:
429 if (const Arg *A = Args.getLastArg(options::OPT_mcpu_EQ))
430 return A->getValue();
431 return "";
432
433 case llvm::Triple::bpfel:
434 case llvm::Triple::bpfeb:
435 case llvm::Triple::sparc:
436 case llvm::Triple::sparcel:
437 case llvm::Triple::sparcv9:
438 if (const Arg *A = Args.getLastArg(options::OPT_mcpu_EQ))
439 return A->getValue();
440 if (T.getArch() == llvm::Triple::sparc && T.isOSSolaris())
441 return "v9";
442 return "";
443
444 case llvm::Triple::x86:
445 case llvm::Triple::x86_64:
446 return x86::getX86TargetCPU(D, Args, T);
447
448 case llvm::Triple::hexagon:
449 return "hexagon" +
450 toolchains::HexagonToolChain::GetTargetCPUVersion(Args).str();
451
452 case llvm::Triple::lanai:
453 return getLanaiTargetCPU(Args);
454
455 case llvm::Triple::systemz:
456 return systemz::getSystemZTargetCPU(Args);
457
458 case llvm::Triple::r600:
459 case llvm::Triple::amdgcn:
460 return getAMDGPUTargetGPU(T, Args);
461
462 case llvm::Triple::wasm32:
463 case llvm::Triple::wasm64:
464 return std::string(getWebAssemblyTargetCPU(Args));
465 }
466}
467
468llvm::StringRef tools::getLTOParallelism(const ArgList &Args, const Driver &D) {
469 Arg *LtoJobsArg = Args.getLastArg(options::OPT_flto_jobs_EQ);
470 if (!LtoJobsArg)
471 return {};
472 if (!llvm::get_threadpool_strategy(LtoJobsArg->getValue()))
473 D.Diag(diag::err_drv_invalid_int_value)
474 << LtoJobsArg->getAsString(Args) << LtoJobsArg->getValue();
475 return LtoJobsArg->getValue();
476}
477
478// CloudABI uses -ffunction-sections and -fdata-sections by default.
479bool tools::isUseSeparateSections(const llvm::Triple &Triple) {
480 return Triple.getOS() == llvm::Triple::CloudABI;
481}
482
483void tools::addLTOOptions(const ToolChain &ToolChain, const ArgList &Args,
484 ArgStringList &CmdArgs, const InputInfo &Output,
485 const InputInfo &Input, bool IsThinLTO) {
486 const char *Linker = Args.MakeArgString(ToolChain.GetLinkerPath());
487 const Driver &D = ToolChain.getDriver();
488 if (llvm::sys::path::filename(Linker) != "ld.lld" &&
489 llvm::sys::path::stem(Linker) != "ld.lld") {
490 // Tell the linker to load the plugin. This has to come before
491 // AddLinkerInputs as gold requires -plugin to come before any -plugin-opt
492 // that -Wl might forward.
493 CmdArgs.push_back("-plugin");
494
495#if defined(_WIN32)
496 const char *Suffix = ".dll";
497#elif defined(__APPLE__)
498 const char *Suffix = ".dylib";
499#else
500 const char *Suffix = ".so";
501#endif
502
503 SmallString<1024> Plugin;
504 llvm::sys::path::native(
505 Twine(D.Dir) + "/../lib" CLANG_LIBDIR_SUFFIX"" "/LLVMgold" + Suffix,
506 Plugin);
507 CmdArgs.push_back(Args.MakeArgString(Plugin));
508 }
509
510 // Try to pass driver level flags relevant to LTO code generation down to
511 // the plugin.
512
513 // Handle flags for selecting CPU variants.
514 std::string CPU = getCPUName(D, Args, ToolChain.getTriple());
515 if (!CPU.empty())
516 CmdArgs.push_back(Args.MakeArgString(Twine("-plugin-opt=mcpu=") + CPU));
517
518 if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
519 // The optimization level matches
520 // CompilerInvocation.cpp:getOptimizationLevel().
521 StringRef OOpt;
522 if (A->getOption().matches(options::OPT_O4) ||
523 A->getOption().matches(options::OPT_Ofast))
524 OOpt = "3";
525 else if (A->getOption().matches(options::OPT_O)) {
526 OOpt = A->getValue();
527 if (OOpt == "g")
528 OOpt = "1";
529 else if (OOpt == "s" || OOpt == "z")
530 OOpt = "2";
531 } else if (A->getOption().matches(options::OPT_O0))
532 OOpt = "0";
533 if (!OOpt.empty())
534 CmdArgs.push_back(Args.MakeArgString(Twine("-plugin-opt=O") + OOpt));
535 }
536
537 if (Args.hasArg(options::OPT_gsplit_dwarf)) {
538 CmdArgs.push_back(
539 Args.MakeArgString(Twine("-plugin-opt=dwo_dir=") +
540 Output.getFilename() + "_dwo"));
541 }
542
543 if (IsThinLTO)
544 CmdArgs.push_back("-plugin-opt=thinlto");
545
546 StringRef Parallelism = getLTOParallelism(Args, D);
547 if (!Parallelism.empty())
548 CmdArgs.push_back(
549 Args.MakeArgString("-plugin-opt=jobs=" + Twine(Parallelism)));
550
551 // If an explicit debugger tuning argument appeared, pass it along.
552 if (Arg *A = Args.getLastArg(options::OPT_gTune_Group,
553 options::OPT_ggdbN_Group)) {
554 if (A->getOption().matches(options::OPT_glldb))
555 CmdArgs.push_back("-plugin-opt=-debugger-tune=lldb");
556 else if (A->getOption().matches(options::OPT_gsce))
557 CmdArgs.push_back("-plugin-opt=-debugger-tune=sce");
558 else if (A->getOption().matches(options::OPT_gdbx))
559 CmdArgs.push_back("-plugin-opt=-debugger-tune=dbx");
560 else
561 CmdArgs.push_back("-plugin-opt=-debugger-tune=gdb");
562 }
563
564 bool UseSeparateSections =
565 isUseSeparateSections(ToolChain.getEffectiveTriple());
566
567 if (Args.hasFlag(options::OPT_ffunction_sections,
568 options::OPT_fno_function_sections, UseSeparateSections)) {
569 CmdArgs.push_back("-plugin-opt=-function-sections");
570 }
571
572 if (Args.hasFlag(options::OPT_fdata_sections, options::OPT_fno_data_sections,
573 UseSeparateSections)) {
574 CmdArgs.push_back("-plugin-opt=-data-sections");
575 }
576
577 if (Arg *A = getLastProfileSampleUseArg(Args)) {
578 StringRef FName = A->getValue();
579 if (!llvm::sys::fs::exists(FName))
580 D.Diag(diag::err_drv_no_such_file) << FName;
581 else
582 CmdArgs.push_back(
583 Args.MakeArgString(Twine("-plugin-opt=sample-profile=") + FName));
584 }
585
586 auto *CSPGOGenerateArg = Args.getLastArg(options::OPT_fcs_profile_generate,
587 options::OPT_fcs_profile_generate_EQ,
588 options::OPT_fno_profile_generate);
589 if (CSPGOGenerateArg &&
590 CSPGOGenerateArg->getOption().matches(options::OPT_fno_profile_generate))
591 CSPGOGenerateArg = nullptr;
592
593 auto *ProfileUseArg = getLastProfileUseArg(Args);
594
595 if (CSPGOGenerateArg) {
596 CmdArgs.push_back(Args.MakeArgString("-plugin-opt=cs-profile-generate"));
597 if (CSPGOGenerateArg->getOption().matches(
598 options::OPT_fcs_profile_generate_EQ)) {
599 SmallString<128> Path(CSPGOGenerateArg->getValue());
600 llvm::sys::path::append(Path, "default_%m.profraw");
601 CmdArgs.push_back(
602 Args.MakeArgString(Twine("-plugin-opt=cs-profile-path=") + Path));
603 } else
604 CmdArgs.push_back(
605 Args.MakeArgString("-plugin-opt=cs-profile-path=default_%m.profraw"));
606 } else if (ProfileUseArg) {
607 SmallString<128> Path(
608 ProfileUseArg->getNumValues() == 0 ? "" : ProfileUseArg->getValue());
609 if (Path.empty() || llvm::sys::fs::is_directory(Path))
610 llvm::sys::path::append(Path, "default.profdata");
611 CmdArgs.push_back(Args.MakeArgString(Twine("-plugin-opt=cs-profile-path=") +
612 Path));
613 }
614
615 // Pass an option to enable/disable the new pass manager.
616 if (auto *A = Args.getLastArg(options::OPT_flegacy_pass_manager,
617 options::OPT_fno_legacy_pass_manager)) {
618 if (A->getOption().matches(options::OPT_flegacy_pass_manager))
619 CmdArgs.push_back("-plugin-opt=legacy-pass-manager");
620 else
621 CmdArgs.push_back("-plugin-opt=new-pass-manager");
622 }
623
624 // Setup statistics file output.
625 SmallString<128> StatsFile = getStatsFileName(Args, Output, Input, D);
626 if (!StatsFile.empty())
627 CmdArgs.push_back(
628 Args.MakeArgString(Twine("-plugin-opt=stats-file=") + StatsFile));
629
630 addX86AlignBranchArgs(D, Args, CmdArgs, /*IsLTO=*/true);
631
632 // Handle remark diagnostics on screen options: '-Rpass-*'.
633 renderRpassOptions(Args, CmdArgs);
634
635 // Handle serialized remarks options: '-fsave-optimization-record'
636 // and '-foptimization-record-*'.
637 if (willEmitRemarks(Args))
638 renderRemarksOptions(Args, CmdArgs, ToolChain.getEffectiveTriple(), Input,
639 Output);
640
641 // Handle remarks hotness/threshold related options.
642 renderRemarksHotnessOptions(Args, CmdArgs);
643
644 addMachineOutlinerArgs(D, Args, CmdArgs, ToolChain.getEffectiveTriple(),
645 /*IsLTO=*/true);
646}
647
648void tools::addArchSpecificRPath(const ToolChain &TC, const ArgList &Args,
649 ArgStringList &CmdArgs) {
650 // Enable -frtlib-add-rpath by default for the case of VE.
651 const bool IsVE = TC.getTriple().isVE();
652 bool DefaultValue = IsVE;
653 if (!Args.hasFlag(options::OPT_frtlib_add_rpath,
654 options::OPT_fno_rtlib_add_rpath, DefaultValue))
655 return;
656
657 std::string CandidateRPath = TC.getArchSpecificLibPath();
658 if (TC.getVFS().exists(CandidateRPath)) {
659 CmdArgs.push_back("-rpath");
660 CmdArgs.push_back(Args.MakeArgString(CandidateRPath));
661 }
662}
663
664bool tools::addOpenMPRuntime(ArgStringList &CmdArgs, const ToolChain &TC,
665 const ArgList &Args, bool ForceStaticHostRuntime,
666 bool IsOffloadingHost, bool GompNeedsRT) {
667 if (!Args.hasFlag(options::OPT_fopenmp, options::OPT_fopenmp_EQ,
668 options::OPT_fno_openmp, false))
669 return false;
670
671 Driver::OpenMPRuntimeKind RTKind = TC.getDriver().getOpenMPRuntime(Args);
672
673 if (RTKind == Driver::OMPRT_Unknown)
674 // Already diagnosed.
675 return false;
676
677 if (ForceStaticHostRuntime)
678 CmdArgs.push_back("-Bstatic");
679
680 switch (RTKind) {
681 case Driver::OMPRT_OMP:
682 CmdArgs.push_back("-lomp");
683 break;
684 case Driver::OMPRT_GOMP:
685 CmdArgs.push_back("-lgomp");
686 break;
687 case Driver::OMPRT_IOMP5:
688 CmdArgs.push_back("-liomp5");
689 break;
690 case Driver::OMPRT_Unknown:
691 break;
692 }
693
694 if (ForceStaticHostRuntime)
695 CmdArgs.push_back("-Bdynamic");
696
697 if (RTKind == Driver::OMPRT_GOMP && GompNeedsRT)
698 CmdArgs.push_back("-lrt");
699
700 if (IsOffloadingHost)
701 CmdArgs.push_back("-lomptarget");
702
703 addArchSpecificRPath(TC, Args, CmdArgs);
704
705 return true;
706}
707
708static void addSanitizerRuntime(const ToolChain &TC, const ArgList &Args,
709 ArgStringList &CmdArgs, StringRef Sanitizer,
710 bool IsShared, bool IsWhole) {
711 // Wrap any static runtimes that must be forced into executable in
712 // whole-archive.
713 if (IsWhole) CmdArgs.push_back("--whole-archive");
714 CmdArgs.push_back(TC.getCompilerRTArgString(
715 Args, Sanitizer, IsShared ? ToolChain::FT_Shared : ToolChain::FT_Static));
716 if (IsWhole) CmdArgs.push_back("--no-whole-archive");
717
718 if (IsShared) {
719 addArchSpecificRPath(TC, Args, CmdArgs);
720 }
721}
722
723// Tries to use a file with the list of dynamic symbols that need to be exported
724// from the runtime library. Returns true if the file was found.
725static bool addSanitizerDynamicList(const ToolChain &TC, const ArgList &Args,
726 ArgStringList &CmdArgs,
727 StringRef Sanitizer) {
728 // Solaris ld defaults to --export-dynamic behaviour but doesn't support
729 // the option, so don't try to pass it.
730 if (TC.getTriple().getOS() == llvm::Triple::Solaris)
731 return true;
732 SmallString<128> SanRT(TC.getCompilerRT(Args, Sanitizer));
733 if (llvm::sys::fs::exists(SanRT + ".syms")) {
734 CmdArgs.push_back(Args.MakeArgString("--dynamic-list=" + SanRT + ".syms"));
735 return true;
736 }
737 return false;
738}
739
740static const char *getAsNeededOption(const ToolChain &TC, bool as_needed) {
741 assert(!TC.getTriple().isOSAIX() &&(static_cast <bool> (!TC.getTriple().isOSAIX() &&
"AIX linker does not support any form of --as-needed option yet."
) ? void (0) : __assert_fail ("!TC.getTriple().isOSAIX() && \"AIX linker does not support any form of --as-needed option yet.\""
, "/build/llvm-toolchain-snapshot-14~++20211016100712+8e1d532707fd/clang/lib/Driver/ToolChains/CommonArgs.cpp"
, 742, __extension__ __PRETTY_FUNCTION__))
742 "AIX linker does not support any form of --as-needed option yet.")(static_cast <bool> (!TC.getTriple().isOSAIX() &&
"AIX linker does not support any form of --as-needed option yet."
) ? void (0) : __assert_fail ("!TC.getTriple().isOSAIX() && \"AIX linker does not support any form of --as-needed option yet.\""
, "/build/llvm-toolchain-snapshot-14~++20211016100712+8e1d532707fd/clang/lib/Driver/ToolChains/CommonArgs.cpp"
, 742, __extension__ __PRETTY_FUNCTION__))
;
743
744 // While the Solaris 11.2 ld added --as-needed/--no-as-needed as aliases
745 // for the native forms -z ignore/-z record, they are missing in Illumos,
746 // so always use the native form.
747 if (TC.getTriple().isOSSolaris())
748 return as_needed ? "-zignore" : "-zrecord";
749 else
750 return as_needed ? "--as-needed" : "--no-as-needed";
751}
752
753void tools::linkSanitizerRuntimeDeps(const ToolChain &TC,
754 ArgStringList &CmdArgs) {
755 // Fuchsia never needs these. Any sanitizer runtimes with system
756 // dependencies use the `.deplibs` feature instead.
757 if (TC.getTriple().isOSFuchsia())
758 return;
759
760 // Force linking against the system libraries sanitizers depends on
761 // (see PR15823 why this is necessary).
762 CmdArgs.push_back(getAsNeededOption(TC, false));
763 // There's no libpthread or librt on RTEMS & Android.
764 if (TC.getTriple().getOS() != llvm::Triple::RTEMS &&
765 !TC.getTriple().isAndroid()) {
766 CmdArgs.push_back("-lpthread");
767 if (!TC.getTriple().isOSOpenBSD())
768 CmdArgs.push_back("-lrt");
769 }
770 CmdArgs.push_back("-lm");
771 // There's no libdl on all OSes.
772 if (!TC.getTriple().isOSFreeBSD() && !TC.getTriple().isOSNetBSD() &&
773 !TC.getTriple().isOSOpenBSD() &&
774 TC.getTriple().getOS() != llvm::Triple::RTEMS)
775 CmdArgs.push_back("-ldl");
776 // Required for backtrace on some OSes
777 if (TC.getTriple().isOSFreeBSD() ||
778 TC.getTriple().isOSNetBSD() ||
779 TC.getTriple().isOSOpenBSD())
780 CmdArgs.push_back("-lexecinfo");
781}
782
783static void
784collectSanitizerRuntimes(const ToolChain &TC, const ArgList &Args,
785 SmallVectorImpl<StringRef> &SharedRuntimes,
786 SmallVectorImpl<StringRef> &StaticRuntimes,
787 SmallVectorImpl<StringRef> &NonWholeStaticRuntimes,
788 SmallVectorImpl<StringRef> &HelperStaticRuntimes,
789 SmallVectorImpl<StringRef> &RequiredSymbols) {
790 const SanitizerArgs &SanArgs = TC.getSanitizerArgs();
791 // Collect shared runtimes.
792 if (SanArgs.needsSharedRt()) {
793 if (SanArgs.needsAsanRt() && SanArgs.linkRuntimes()) {
794 SharedRuntimes.push_back("asan");
795 if (!Args.hasArg(options::OPT_shared) && !TC.getTriple().isAndroid())
796 HelperStaticRuntimes.push_back("asan-preinit");
797 }
798 if (SanArgs.needsMemProfRt() && SanArgs.linkRuntimes()) {
799 SharedRuntimes.push_back("memprof");
800 if (!Args.hasArg(options::OPT_shared) && !TC.getTriple().isAndroid())
801 HelperStaticRuntimes.push_back("memprof-preinit");
802 }
803 if (SanArgs.needsUbsanRt() && SanArgs.linkRuntimes()) {
804 if (SanArgs.requiresMinimalRuntime())
805 SharedRuntimes.push_back("ubsan_minimal");
806 else
807 SharedRuntimes.push_back("ubsan_standalone");
808 }
809 if (SanArgs.needsScudoRt() && SanArgs.linkRuntimes()) {
810 if (SanArgs.requiresMinimalRuntime())
811 SharedRuntimes.push_back("scudo_minimal");
812 else
813 SharedRuntimes.push_back("scudo");
814 }
815 if (SanArgs.needsTsanRt() && SanArgs.linkRuntimes())
816 SharedRuntimes.push_back("tsan");
817 if (SanArgs.needsHwasanRt() && SanArgs.linkRuntimes()) {
818 if (SanArgs.needsHwasanAliasesRt())
819 SharedRuntimes.push_back("hwasan_aliases");
820 else
821 SharedRuntimes.push_back("hwasan");
822 }
823 }
824
825 // The stats_client library is also statically linked into DSOs.
826 if (SanArgs.needsStatsRt() && SanArgs.linkRuntimes())
827 StaticRuntimes.push_back("stats_client");
828
829 // Collect static runtimes.
830 if (Args.hasArg(options::OPT_shared)) {
831 // Don't link static runtimes into DSOs.
832 return;
833 }
834
835 // Each static runtime that has a DSO counterpart above is excluded below,
836 // but runtimes that exist only as static are not affected by needsSharedRt.
837
838 if (!SanArgs.needsSharedRt() && SanArgs.needsAsanRt() && SanArgs.linkRuntimes()) {
839 StaticRuntimes.push_back("asan");
840 if (SanArgs.linkCXXRuntimes())
841 StaticRuntimes.push_back("asan_cxx");
842 }
843
844 if (!SanArgs.needsSharedRt() && SanArgs.needsMemProfRt() &&
845 SanArgs.linkRuntimes()) {
846 StaticRuntimes.push_back("memprof");
847 if (SanArgs.linkCXXRuntimes())
848 StaticRuntimes.push_back("memprof_cxx");
849 }
850
851 if (!SanArgs.needsSharedRt() && SanArgs.needsHwasanRt() && SanArgs.linkRuntimes()) {
852 if (SanArgs.needsHwasanAliasesRt()) {
853 StaticRuntimes.push_back("hwasan_aliases");
854 if (SanArgs.linkCXXRuntimes())
855 StaticRuntimes.push_back("hwasan_aliases_cxx");
856 } else {
857 StaticRuntimes.push_back("hwasan");
858 if (SanArgs.linkCXXRuntimes())
859 StaticRuntimes.push_back("hwasan_cxx");
860 }
861 }
862 if (SanArgs.needsDfsanRt() && SanArgs.linkRuntimes())
863 StaticRuntimes.push_back("dfsan");
864 if (SanArgs.needsLsanRt() && SanArgs.linkRuntimes())
865 StaticRuntimes.push_back("lsan");
866 if (SanArgs.needsMsanRt() && SanArgs.linkRuntimes()) {
867 StaticRuntimes.push_back("msan");
868 if (SanArgs.linkCXXRuntimes())
869 StaticRuntimes.push_back("msan_cxx");
870 }
871 if (!SanArgs.needsSharedRt() && SanArgs.needsTsanRt() &&
872 SanArgs.linkRuntimes()) {
873 StaticRuntimes.push_back("tsan");
874 if (SanArgs.linkCXXRuntimes())
875 StaticRuntimes.push_back("tsan_cxx");
876 }
877 if (!SanArgs.needsSharedRt() && SanArgs.needsUbsanRt() && SanArgs.linkRuntimes()) {
878 if (SanArgs.requiresMinimalRuntime()) {
879 StaticRuntimes.push_back("ubsan_minimal");
880 } else {
881 StaticRuntimes.push_back("ubsan_standalone");
882 if (SanArgs.linkCXXRuntimes())
883 StaticRuntimes.push_back("ubsan_standalone_cxx");
884 }
885 }
886 if (SanArgs.needsSafeStackRt() && SanArgs.linkRuntimes()) {
887 NonWholeStaticRuntimes.push_back("safestack");
888 RequiredSymbols.push_back("__safestack_init");
889 }
890 if (!(SanArgs.needsSharedRt() && SanArgs.needsUbsanRt() && SanArgs.linkRuntimes())) {
891 if (SanArgs.needsCfiRt() && SanArgs.linkRuntimes())
892 StaticRuntimes.push_back("cfi");
893 if (SanArgs.needsCfiDiagRt() && SanArgs.linkRuntimes()) {
894 StaticRuntimes.push_back("cfi_diag");
895 if (SanArgs.linkCXXRuntimes())
896 StaticRuntimes.push_back("ubsan_standalone_cxx");
897 }
898 }
899 if (SanArgs.needsStatsRt() && SanArgs.linkRuntimes()) {
900 NonWholeStaticRuntimes.push_back("stats");
901 RequiredSymbols.push_back("__sanitizer_stats_register");
902 }
903 if (!SanArgs.needsSharedRt() && SanArgs.needsScudoRt() && SanArgs.linkRuntimes()) {
904 if (SanArgs.requiresMinimalRuntime()) {
905 StaticRuntimes.push_back("scudo_minimal");
906 if (SanArgs.linkCXXRuntimes())
907 StaticRuntimes.push_back("scudo_cxx_minimal");
908 } else {
909 StaticRuntimes.push_back("scudo");
910 if (SanArgs.linkCXXRuntimes())
911 StaticRuntimes.push_back("scudo_cxx");
912 }
913 }
914}
915
916// Should be called before we add system libraries (C++ ABI, libstdc++/libc++,
917// C runtime, etc). Returns true if sanitizer system deps need to be linked in.
918bool tools::addSanitizerRuntimes(const ToolChain &TC, const ArgList &Args,
919 ArgStringList &CmdArgs) {
920 SmallVector<StringRef, 4> SharedRuntimes, StaticRuntimes,
921 NonWholeStaticRuntimes, HelperStaticRuntimes, RequiredSymbols;
922 collectSanitizerRuntimes(TC, Args, SharedRuntimes, StaticRuntimes,
923 NonWholeStaticRuntimes, HelperStaticRuntimes,
924 RequiredSymbols);
925
926 const SanitizerArgs &SanArgs = TC.getSanitizerArgs();
927 // Inject libfuzzer dependencies.
928 if (SanArgs.needsFuzzer() && SanArgs.linkRuntimes() &&
929 !Args.hasArg(options::OPT_shared)) {
930
931 addSanitizerRuntime(TC, Args, CmdArgs, "fuzzer", false, true);
932 if (SanArgs.needsFuzzerInterceptors())
933 addSanitizerRuntime(TC, Args, CmdArgs, "fuzzer_interceptors", false,
934 true);
935 if (!Args.hasArg(clang::driver::options::OPT_nostdlibxx)) {
936 bool OnlyLibstdcxxStatic = Args.hasArg(options::OPT_static_libstdcxx) &&
937 !Args.hasArg(options::OPT_static);
938 if (OnlyLibstdcxxStatic)
939 CmdArgs.push_back("-Bstatic");
940 TC.AddCXXStdlibLibArgs(Args, CmdArgs);
941 if (OnlyLibstdcxxStatic)
942 CmdArgs.push_back("-Bdynamic");
943 }
944 }
945
946 for (auto RT : SharedRuntimes)
947 addSanitizerRuntime(TC, Args, CmdArgs, RT, true, false);
948 for (auto RT : HelperStaticRuntimes)
949 addSanitizerRuntime(TC, Args, CmdArgs, RT, false, true);
950 bool AddExportDynamic = false;
951 for (auto RT : StaticRuntimes) {
952 addSanitizerRuntime(TC, Args, CmdArgs, RT, false, true);
953 AddExportDynamic |= !addSanitizerDynamicList(TC, Args, CmdArgs, RT);
954 }
955 for (auto RT : NonWholeStaticRuntimes) {
956 addSanitizerRuntime(TC, Args, CmdArgs, RT, false, false);
957 AddExportDynamic |= !addSanitizerDynamicList(TC, Args, CmdArgs, RT);
958 }
959 for (auto S : RequiredSymbols) {
960 CmdArgs.push_back("-u");
961 CmdArgs.push_back(Args.MakeArgString(S));
962 }
963 // If there is a static runtime with no dynamic list, force all the symbols
964 // to be dynamic to be sure we export sanitizer interface functions.
965 if (AddExportDynamic)
966 CmdArgs.push_back("--export-dynamic");
967
968 if (SanArgs.hasCrossDsoCfi() && !AddExportDynamic)
969 CmdArgs.push_back("--export-dynamic-symbol=__cfi_check");
970
971 return !StaticRuntimes.empty() || !NonWholeStaticRuntimes.empty();
972}
973
974bool tools::addXRayRuntime(const ToolChain&TC, const ArgList &Args, ArgStringList &CmdArgs) {
975 if (Args.hasArg(options::OPT_shared))
976 return false;
977
978 if (TC.getXRayArgs().needsXRayRt()) {
979 CmdArgs.push_back("-whole-archive");
980 CmdArgs.push_back(TC.getCompilerRTArgString(Args, "xray"));
981 for (const auto &Mode : TC.getXRayArgs().modeList())
982 CmdArgs.push_back(TC.getCompilerRTArgString(Args, Mode));
983 CmdArgs.push_back("-no-whole-archive");
984 return true;
985 }
986
987 return false;
988}
989
990void tools::linkXRayRuntimeDeps(const ToolChain &TC, ArgStringList &CmdArgs) {
991 CmdArgs.push_back(getAsNeededOption(TC, false));
992 CmdArgs.push_back("-lpthread");
993 if (!TC.getTriple().isOSOpenBSD())
994 CmdArgs.push_back("-lrt");
995 CmdArgs.push_back("-lm");
996
997 if (!TC.getTriple().isOSFreeBSD() &&
998 !TC.getTriple().isOSNetBSD() &&
999 !TC.getTriple().isOSOpenBSD())
1000 CmdArgs.push_back("-ldl");
1001}
1002
1003bool tools::areOptimizationsEnabled(const ArgList &Args) {
1004 // Find the last -O arg and see if it is non-zero.
1005 if (Arg *A = Args.getLastArg(options::OPT_O_Group))
1006 return !A->getOption().matches(options::OPT_O0);
1007 // Defaults to -O0.
1008 return false;
1009}
1010
1011const char *tools::SplitDebugName(const JobAction &JA, const ArgList &Args,
1012 const InputInfo &Input,
1013 const InputInfo &Output) {
1014 auto AddPostfix = [JA](auto &F) {
1015 if (JA.getOffloadingDeviceKind() == Action::OFK_HIP)
1016 F += (Twine("_") + JA.getOffloadingArch()).str();
1017 F += ".dwo";
1018 };
1019 if (Arg *A = Args.getLastArg(options::OPT_gsplit_dwarf_EQ))
1020 if (StringRef(A->getValue()) == "single")
1021 return Args.MakeArgString(Output.getFilename());
1022
1023 Arg *FinalOutput = Args.getLastArg(options::OPT_o);
1024 if (FinalOutput && Args.hasArg(options::OPT_c)) {
1025 SmallString<128> T(FinalOutput->getValue());
1026 llvm::sys::path::remove_filename(T);
1027 llvm::sys::path::append(T, llvm::sys::path::stem(FinalOutput->getValue()));
1028 AddPostfix(T);
1029 return Args.MakeArgString(T);
1030 } else {
1031 // Use the compilation dir.
1032 Arg *A = Args.getLastArg(options::OPT_ffile_compilation_dir_EQ,
1033 options::OPT_fdebug_compilation_dir_EQ);
1034 SmallString<128> T(A ? A->getValue() : "");
1035 SmallString<128> F(llvm::sys::path::stem(Input.getBaseInput()));
1036 AddPostfix(F);
1037 T += F;
1038 return Args.MakeArgString(T);
1039 }
1040}
1041
1042void tools::SplitDebugInfo(const ToolChain &TC, Compilation &C, const Tool &T,
1043 const JobAction &JA, const ArgList &Args,
1044 const InputInfo &Output, const char *OutFile) {
1045 ArgStringList ExtractArgs;
1046 ExtractArgs.push_back("--extract-dwo");
1047
1048 ArgStringList StripArgs;
1049 StripArgs.push_back("--strip-dwo");
1050
1051 // Grabbing the output of the earlier compile step.
1052 StripArgs.push_back(Output.getFilename());
1053 ExtractArgs.push_back(Output.getFilename());
1054 ExtractArgs.push_back(OutFile);
1055
1056 const char *Exec =
1057 Args.MakeArgString(TC.GetProgramPath(CLANG_DEFAULT_OBJCOPY"objcopy"));
1058 InputInfo II(types::TY_Object, Output.getFilename(), Output.getFilename());
1059
1060 // First extract the dwo sections.
1061 C.addCommand(std::make_unique<Command>(JA, T,
1062 ResponseFileSupport::AtFileCurCP(),
1063 Exec, ExtractArgs, II, Output));
1064
1065 // Then remove them from the original .o file.
1066 C.addCommand(std::make_unique<Command>(
1067 JA, T, ResponseFileSupport::AtFileCurCP(), Exec, StripArgs, II, Output));
1068}
1069
1070// Claim options we don't want to warn if they are unused. We do this for
1071// options that build systems might add but are unused when assembling or only
1072// running the preprocessor for example.
1073void tools::claimNoWarnArgs(const ArgList &Args) {
1074 // Don't warn about unused -f(no-)?lto. This can happen when we're
1075 // preprocessing, precompiling or assembling.
1076 Args.ClaimAllArgs(options::OPT_flto_EQ);
1077 Args.ClaimAllArgs(options::OPT_flto);
1078 Args.ClaimAllArgs(options::OPT_fno_lto);
1079}
1080
1081Arg *tools::getLastProfileUseArg(const ArgList &Args) {
1082 auto *ProfileUseArg = Args.getLastArg(
1083 options::OPT_fprofile_instr_use, options::OPT_fprofile_instr_use_EQ,
1084 options::OPT_fprofile_use, options::OPT_fprofile_use_EQ,
1085 options::OPT_fno_profile_instr_use);
1086
1087 if (ProfileUseArg &&
1088 ProfileUseArg->getOption().matches(options::OPT_fno_profile_instr_use))
1089 ProfileUseArg = nullptr;
1090
1091 return ProfileUseArg;
1092}
1093
1094Arg *tools::getLastProfileSampleUseArg(const ArgList &Args) {
1095 auto *ProfileSampleUseArg = Args.getLastArg(
1096 options::OPT_fprofile_sample_use, options::OPT_fprofile_sample_use_EQ,
1097 options::OPT_fauto_profile, options::OPT_fauto_profile_EQ,
1098 options::OPT_fno_profile_sample_use, options::OPT_fno_auto_profile);
1099
1100 if (ProfileSampleUseArg &&
1101 (ProfileSampleUseArg->getOption().matches(
1102 options::OPT_fno_profile_sample_use) ||
1103 ProfileSampleUseArg->getOption().matches(options::OPT_fno_auto_profile)))
1104 return nullptr;
1105
1106 return Args.getLastArg(options::OPT_fprofile_sample_use_EQ,
1107 options::OPT_fauto_profile_EQ);
1108}
1109
1110/// Parses the various -fpic/-fPIC/-fpie/-fPIE arguments. Then,
1111/// smooshes them together with platform defaults, to decide whether
1112/// this compile should be using PIC mode or not. Returns a tuple of
1113/// (RelocationModel, PICLevel, IsPIE).
1114std::tuple<llvm::Reloc::Model, unsigned, bool>
1115tools::ParsePICArgs(const ToolChain &ToolChain, const ArgList &Args) {
1116 const llvm::Triple &EffectiveTriple = ToolChain.getEffectiveTriple();
1117 const llvm::Triple &Triple = ToolChain.getTriple();
1118
1119 bool PIE = ToolChain.isPIEDefault();
1120 bool PIC = PIE || ToolChain.isPICDefault();
1121 // The Darwin/MachO default to use PIC does not apply when using -static.
1122 if (Triple.isOSBinFormatMachO() && Args.hasArg(options::OPT_static))
1123 PIE = PIC = false;
1124 bool IsPICLevelTwo = PIC;
1125
1126 bool KernelOrKext =
1127 Args.hasArg(options::OPT_mkernel, options::OPT_fapple_kext);
1128
1129 // Android-specific defaults for PIC/PIE
1130 if (Triple.isAndroid()) {
1131 switch (Triple.getArch()) {
1132 case llvm::Triple::arm:
1133 case llvm::Triple::armeb:
1134 case llvm::Triple::thumb:
1135 case llvm::Triple::thumbeb:
1136 case llvm::Triple::aarch64:
1137 case llvm::Triple::mips:
1138 case llvm::Triple::mipsel:
1139 case llvm::Triple::mips64:
1140 case llvm::Triple::mips64el:
1141 PIC = true; // "-fpic"
1142 break;
1143
1144 case llvm::Triple::x86:
1145 case llvm::Triple::x86_64:
1146 PIC = true; // "-fPIC"
1147 IsPICLevelTwo = true;
1148 break;
1149
1150 default:
1151 break;
1152 }
1153 }
1154
1155 // OpenBSD-specific defaults for PIE
1156 if (Triple.isOSOpenBSD()) {
1157 switch (ToolChain.getArch()) {
1158 case llvm::Triple::arm:
1159 case llvm::Triple::aarch64:
1160 case llvm::Triple::mips64:
1161 case llvm::Triple::mips64el:
1162 case llvm::Triple::x86:
1163 case llvm::Triple::x86_64:
1164 IsPICLevelTwo = false; // "-fpie"
1165 break;
1166
1167 case llvm::Triple::ppc:
1168 case llvm::Triple::sparcv9:
1169 IsPICLevelTwo = true; // "-fPIE"
1170 break;
1171
1172 default:
1173 break;
1174 }
1175 }
1176
1177 // AMDGPU-specific defaults for PIC.
1178 if (Triple.getArch() == llvm::Triple::amdgcn)
1179 PIC = true;
1180
1181 // The last argument relating to either PIC or PIE wins, and no
1182 // other argument is used. If the last argument is any flavor of the
1183 // '-fno-...' arguments, both PIC and PIE are disabled. Any PIE
1184 // option implicitly enables PIC at the same level.
1185 Arg *LastPICArg = Args.getLastArg(options::OPT_fPIC, options::OPT_fno_PIC,
1186 options::OPT_fpic, options::OPT_fno_pic,
1187 options::OPT_fPIE, options::OPT_fno_PIE,
1188 options::OPT_fpie, options::OPT_fno_pie);
1189 if (Triple.isOSWindows() && LastPICArg &&
1190 LastPICArg ==
1191 Args.getLastArg(options::OPT_fPIC, options::OPT_fpic,
1192 options::OPT_fPIE, options::OPT_fpie)) {
1193 ToolChain.getDriver().Diag(diag::err_drv_unsupported_opt_for_target)
1194 << LastPICArg->getSpelling() << Triple.str();
1195 if (Triple.getArch() == llvm::Triple::x86_64)
1196 return std::make_tuple(llvm::Reloc::PIC_, 2U, false);
1197 return std::make_tuple(llvm::Reloc::Static, 0U, false);
1198 }
1199
1200 // Check whether the tool chain trumps the PIC-ness decision. If the PIC-ness
1201 // is forced, then neither PIC nor PIE flags will have no effect.
1202 if (!ToolChain.isPICDefaultForced()) {
1203 if (LastPICArg) {
1204 Option O = LastPICArg->getOption();
1205 if (O.matches(options::OPT_fPIC) || O.matches(options::OPT_fpic) ||
1206 O.matches(options::OPT_fPIE) || O.matches(options::OPT_fpie)) {
1207 PIE = O.matches(options::OPT_fPIE) || O.matches(options::OPT_fpie);
1208 PIC =
1209 PIE || O.matches(options::OPT_fPIC) || O.matches(options::OPT_fpic);
1210 IsPICLevelTwo =
1211 O.matches(options::OPT_fPIE) || O.matches(options::OPT_fPIC);
1212 } else {
1213 PIE = PIC = false;
1214 if (EffectiveTriple.isPS4CPU()) {
1215 Arg *ModelArg = Args.getLastArg(options::OPT_mcmodel_EQ);
1216 StringRef Model = ModelArg ? ModelArg->getValue() : "";
1217 if (Model != "kernel") {
1218 PIC = true;
1219 ToolChain.getDriver().Diag(diag::warn_drv_ps4_force_pic)
1220 << LastPICArg->getSpelling();
1221 }
1222 }
1223 }
1224 }
1225 }
1226
1227 // Introduce a Darwin and PS4-specific hack. If the default is PIC, but the
1228 // PIC level would've been set to level 1, force it back to level 2 PIC
1229 // instead.
1230 if (PIC && (Triple.isOSDarwin() || EffectiveTriple.isPS4CPU()))
1231 IsPICLevelTwo |= ToolChain.isPICDefault();
1232
1233 // This kernel flags are a trump-card: they will disable PIC/PIE
1234 // generation, independent of the argument order.
1235 if (KernelOrKext &&
1236 ((!EffectiveTriple.isiOS() || EffectiveTriple.isOSVersionLT(6)) &&
1237 !EffectiveTriple.isWatchOS()))
1238 PIC = PIE = false;
1239
1240 if (Arg *A = Args.getLastArg(options::OPT_mdynamic_no_pic)) {
1241 // This is a very special mode. It trumps the other modes, almost no one
1242 // uses it, and it isn't even valid on any OS but Darwin.
1243 if (!Triple.isOSDarwin())
1244 ToolChain.getDriver().Diag(diag::err_drv_unsupported_opt_for_target)
1245 << A->getSpelling() << Triple.str();
1246
1247 // FIXME: Warn when this flag trumps some other PIC or PIE flag.
1248
1249 // Only a forced PIC mode can cause the actual compile to have PIC defines
1250 // etc., no flags are sufficient. This behavior was selected to closely
1251 // match that of llvm-gcc and Apple GCC before that.
1252 PIC = ToolChain.isPICDefault() && ToolChain.isPICDefaultForced();
1253
1254 return std::make_tuple(llvm::Reloc::DynamicNoPIC, PIC ? 2U : 0U, false);
1255 }
1256
1257 bool EmbeddedPISupported;
1258 switch (Triple.getArch()) {
1259 case llvm::Triple::arm:
1260 case llvm::Triple::armeb:
1261 case llvm::Triple::thumb:
1262 case llvm::Triple::thumbeb:
1263 EmbeddedPISupported = true;
1264 break;
1265 default:
1266 EmbeddedPISupported = false;
1267 break;
1268 }
1269
1270 bool ROPI = false, RWPI = false;
1271 Arg* LastROPIArg = Args.getLastArg(options::OPT_fropi, options::OPT_fno_ropi);
1272 if (LastROPIArg && LastROPIArg->getOption().matches(options::OPT_fropi)) {
1273 if (!EmbeddedPISupported)
1274 ToolChain.getDriver().Diag(diag::err_drv_unsupported_opt_for_target)
1275 << LastROPIArg->getSpelling() << Triple.str();
1276 ROPI = true;
1277 }
1278 Arg *LastRWPIArg = Args.getLastArg(options::OPT_frwpi, options::OPT_fno_rwpi);
1279 if (LastRWPIArg && LastRWPIArg->getOption().matches(options::OPT_frwpi)) {
1280 if (!EmbeddedPISupported)
1281 ToolChain.getDriver().Diag(diag::err_drv_unsupported_opt_for_target)
1282 << LastRWPIArg->getSpelling() << Triple.str();
1283 RWPI = true;
1284 }
1285
1286 // ROPI and RWPI are not compatible with PIC or PIE.
1287 if ((ROPI || RWPI) && (PIC || PIE))
1288 ToolChain.getDriver().Diag(diag::err_drv_ropi_rwpi_incompatible_with_pic);
1289
1290 if (Triple.isMIPS()) {
1291 StringRef CPUName;
1292 StringRef ABIName;
1293 mips::getMipsCPUAndABI(Args, Triple, CPUName, ABIName);
1294 // When targeting the N64 ABI, PIC is the default, except in the case
1295 // when the -mno-abicalls option is used. In that case we exit
1296 // at next check regardless of PIC being set below.
1297 if (ABIName == "n64")
1298 PIC = true;
1299 // When targettng MIPS with -mno-abicalls, it's always static.
1300 if(Args.hasArg(options::OPT_mno_abicalls))
1301 return std::make_tuple(llvm::Reloc::Static, 0U, false);
1302 // Unlike other architectures, MIPS, even with -fPIC/-mxgot/multigot,
1303 // does not use PIC level 2 for historical reasons.
1304 IsPICLevelTwo = false;
1305 }
1306
1307 if (PIC)
1308 return std::make_tuple(llvm::Reloc::PIC_, IsPICLevelTwo ? 2U : 1U, PIE);
1309
1310 llvm::Reloc::Model RelocM = llvm::Reloc::Static;
1311 if (ROPI && RWPI)
1312 RelocM = llvm::Reloc::ROPI_RWPI;
1313 else if (ROPI)
1314 RelocM = llvm::Reloc::ROPI;
1315 else if (RWPI)
1316 RelocM = llvm::Reloc::RWPI;
1317
1318 return std::make_tuple(RelocM, 0U, false);
1319}
1320
1321// `-falign-functions` indicates that the functions should be aligned to a
1322// 16-byte boundary.
1323//
1324// `-falign-functions=1` is the same as `-fno-align-functions`.
1325//
1326// The scalar `n` in `-falign-functions=n` must be an integral value between
1327// [0, 65536]. If the value is not a power-of-two, it will be rounded up to
1328// the nearest power-of-two.
1329//
1330// If we return `0`, the frontend will default to the backend's preferred
1331// alignment.
1332//
1333// NOTE: icc only allows values between [0, 4096]. icc uses `-falign-functions`
1334// to mean `-falign-functions=16`. GCC defaults to the backend's preferred
1335// alignment. For unaligned functions, we default to the backend's preferred
1336// alignment.
1337unsigned tools::ParseFunctionAlignment(const ToolChain &TC,
1338 const ArgList &Args) {
1339 const Arg *A = Args.getLastArg(options::OPT_falign_functions,
1340 options::OPT_falign_functions_EQ,
1341 options::OPT_fno_align_functions);
1342 if (!A || A->getOption().matches(options::OPT_fno_align_functions))
1343 return 0;
1344
1345 if (A->getOption().matches(options::OPT_falign_functions))
1346 return 0;
1347
1348 unsigned Value = 0;
1349 if (StringRef(A->getValue()).getAsInteger(10, Value) || Value > 65536)
1350 TC.getDriver().Diag(diag::err_drv_invalid_int_value)
1351 << A->getAsString(Args) << A->getValue();
1352 return Value ? llvm::Log2_32_Ceil(std::min(Value, 65536u)) : Value;
1353}
1354
1355unsigned tools::ParseDebugDefaultVersion(const ToolChain &TC,
1356 const ArgList &Args) {
1357 const Arg *A = Args.getLastArg(options::OPT_fdebug_default_version);
1358
1359 if (!A)
1360 return 0;
1361
1362 unsigned Value = 0;
1363 if (StringRef(A->getValue()).getAsInteger(10, Value) || Value > 5 ||
1364 Value < 2)
1365 TC.getDriver().Diag(diag::err_drv_invalid_int_value)
1366 << A->getAsString(Args) << A->getValue();
1367 return Value;
1368}
1369
1370void tools::AddAssemblerKPIC(const ToolChain &ToolChain, const ArgList &Args,
1371 ArgStringList &CmdArgs) {
1372 llvm::Reloc::Model RelocationModel;
1373 unsigned PICLevel;
1374 bool IsPIE;
1375 std::tie(RelocationModel, PICLevel, IsPIE) = ParsePICArgs(ToolChain, Args);
1376
1377 if (RelocationModel != llvm::Reloc::Static)
1378 CmdArgs.push_back("-KPIC");
1379}
1380
1381/// Determine whether Objective-C automated reference counting is
1382/// enabled.
1383bool tools::isObjCAutoRefCount(const ArgList &Args) {
1384 return Args.hasFlag(options::OPT_fobjc_arc, options::OPT_fno_objc_arc, false);
1385}
1386
1387enum class LibGccType { UnspecifiedLibGcc, StaticLibGcc, SharedLibGcc };
1388
1389static LibGccType getLibGccType(const ToolChain &TC, const Driver &D,
1390 const ArgList &Args) {
1391 if (Args.hasArg(options::OPT_static_libgcc) ||
1392 Args.hasArg(options::OPT_static) || Args.hasArg(options::OPT_static_pie))
1393 return LibGccType::StaticLibGcc;
1394 if (Args.hasArg(options::OPT_shared_libgcc))
1395 return LibGccType::SharedLibGcc;
1396 // The Android NDK only provides libunwind.a, not libunwind.so.
1397 if (TC.getTriple().isAndroid())
1398 return LibGccType::StaticLibGcc;
1399 // For MinGW, don't imply a shared libgcc here, we only want to return
1400 // SharedLibGcc if that was explicitly requested.
1401 if (D.CCCIsCXX() && !TC.getTriple().isOSCygMing())
1402 return LibGccType::SharedLibGcc;
1403 return LibGccType::UnspecifiedLibGcc;
1404}
1405
1406// Gcc adds libgcc arguments in various ways:
1407//
1408// gcc <none>: -lgcc --as-needed -lgcc_s --no-as-needed
1409// g++ <none>: -lgcc_s -lgcc
1410// gcc shared: -lgcc_s -lgcc
1411// g++ shared: -lgcc_s -lgcc
1412// gcc static: -lgcc -lgcc_eh
1413// g++ static: -lgcc -lgcc_eh
1414// gcc static-pie: -lgcc -lgcc_eh
1415// g++ static-pie: -lgcc -lgcc_eh
1416//
1417// Also, certain targets need additional adjustments.
1418
1419static void AddUnwindLibrary(const ToolChain &TC, const Driver &D,
1420 ArgStringList &CmdArgs, const ArgList &Args) {
1421 ToolChain::UnwindLibType UNW = TC.GetUnwindLibType(Args);
1422 // Targets that don't use unwind libraries.
1423 if ((TC.getTriple().isAndroid() && UNW == ToolChain::UNW_Libgcc) ||
1424 TC.getTriple().isOSIAMCU() || TC.getTriple().isOSBinFormatWasm() ||
1425 UNW == ToolChain::UNW_None)
1426 return;
1427
1428 LibGccType LGT = getLibGccType(TC, D, Args);
1429 bool AsNeeded = LGT == LibGccType::UnspecifiedLibGcc &&
1430 !TC.getTriple().isAndroid() &&
1431 !TC.getTriple().isOSCygMing() && !TC.getTriple().isOSAIX();
1432 if (AsNeeded)
1433 CmdArgs.push_back(getAsNeededOption(TC, true));
1434
1435 switch (UNW) {
1436 case ToolChain::UNW_None:
1437 return;
1438 case ToolChain::UNW_Libgcc: {
1439 if (LGT == LibGccType::StaticLibGcc)
1440 CmdArgs.push_back("-lgcc_eh");
1441 else
1442 CmdArgs.push_back("-lgcc_s");
1443 break;
1444 }
1445 case ToolChain::UNW_CompilerRT:
1446 if (TC.getTriple().isOSAIX()) {
1447 // AIX only has libunwind as a shared library. So do not pass
1448 // anything in if -static is specified.
1449 if (LGT != LibGccType::StaticLibGcc)
1450 CmdArgs.push_back("-lunwind");
1451 } else if (LGT == LibGccType::StaticLibGcc) {
1452 CmdArgs.push_back("-l:libunwind.a");
1453 } else if (TC.getTriple().isOSCygMing()) {
1454 if (LGT == LibGccType::SharedLibGcc)
1455 CmdArgs.push_back("-l:libunwind.dll.a");
1456 else
1457 // Let the linker choose between libunwind.dll.a and libunwind.a
1458 // depending on what's available, and depending on the -static flag
1459 CmdArgs.push_back("-lunwind");
1460 } else {
1461 CmdArgs.push_back("-l:libunwind.so");
1462 }
1463 break;
1464 }
1465
1466 if (AsNeeded)
1467 CmdArgs.push_back(getAsNeededOption(TC, false));
1468}
1469
1470static void AddLibgcc(const ToolChain &TC, const Driver &D,
1471 ArgStringList &CmdArgs, const ArgList &Args) {
1472 LibGccType LGT = getLibGccType(TC, D, Args);
1473 if (LGT != LibGccType::SharedLibGcc)
1474 CmdArgs.push_back("-lgcc");
1475 AddUnwindLibrary(TC, D, CmdArgs, Args);
1476 if (LGT == LibGccType::SharedLibGcc)
1477 CmdArgs.push_back("-lgcc");
1478}
1479
1480void tools::AddRunTimeLibs(const ToolChain &TC, const Driver &D,
1481 ArgStringList &CmdArgs, const ArgList &Args) {
1482 // Make use of compiler-rt if --rtlib option is used
1483 ToolChain::RuntimeLibType RLT = TC.GetRuntimeLibType(Args);
1484
1485 switch (RLT) {
1486 case ToolChain::RLT_CompilerRT:
1487 CmdArgs.push_back(TC.getCompilerRTArgString(Args, "builtins"));
1488 AddUnwindLibrary(TC, D, CmdArgs, Args);
1489 break;
1490 case ToolChain::RLT_Libgcc:
1491 // Make sure libgcc is not used under MSVC environment by default
1492 if (TC.getTriple().isKnownWindowsMSVCEnvironment()) {
1493 // Issue error diagnostic if libgcc is explicitly specified
1494 // through command line as --rtlib option argument.
1495 if (Args.hasArg(options::OPT_rtlib_EQ)) {
1496 TC.getDriver().Diag(diag::err_drv_unsupported_rtlib_for_platform)
1497 << Args.getLastArg(options::OPT_rtlib_EQ)->getValue() << "MSVC";
1498 }
1499 } else
1500 AddLibgcc(TC, D, CmdArgs, Args);
1501 break;
1502 }
1503
1504 // On Android, the unwinder uses dl_iterate_phdr (or one of
1505 // dl_unwind_find_exidx/__gnu_Unwind_Find_exidx on arm32) from libdl.so. For
1506 // statically-linked executables, these functions come from libc.a instead.
1507 if (TC.getTriple().isAndroid() && !Args.hasArg(options::OPT_static) &&
1508 !Args.hasArg(options::OPT_static_pie))
1509 CmdArgs.push_back("-ldl");
1510}
1511
1512SmallString<128> tools::getStatsFileName(const llvm::opt::ArgList &Args,
1513 const InputInfo &Output,
1514 const InputInfo &Input,
1515 const Driver &D) {
1516 const Arg *A = Args.getLastArg(options::OPT_save_stats_EQ);
1517 if (!A)
1518 return {};
1519
1520 StringRef SaveStats = A->getValue();
1521 SmallString<128> StatsFile;
1522 if (SaveStats == "obj" && Output.isFilename()) {
1523 StatsFile.assign(Output.getFilename());
1524 llvm::sys::path::remove_filename(StatsFile);
1525 } else if (SaveStats != "cwd") {
1526 D.Diag(diag::err_drv_invalid_value) << A->getAsString(Args) << SaveStats;
1527 return {};
1528 }
1529
1530 StringRef BaseName = llvm::sys::path::filename(Input.getBaseInput());
1531 llvm::sys::path::append(StatsFile, BaseName);
1532 llvm::sys::path::replace_extension(StatsFile, "stats");
1533 return StatsFile;
1534}
1535
1536void tools::addMultilibFlag(bool Enabled, const char *const Flag,
1537 Multilib::flags_list &Flags) {
1538 Flags.push_back(std::string(Enabled ? "+" : "-") + Flag);
1539}
1540
1541void tools::addX86AlignBranchArgs(const Driver &D, const ArgList &Args,
1542 ArgStringList &CmdArgs, bool IsLTO) {
1543 auto addArg = [&, IsLTO](const Twine &Arg) {
1544 if (IsLTO) {
1545 CmdArgs.push_back(Args.MakeArgString("-plugin-opt=" + Arg));
1546 } else {
1547 CmdArgs.push_back("-mllvm");
1548 CmdArgs.push_back(Args.MakeArgString(Arg));
1549 }
1550 };
1551
1552 if (Args.hasArg(options::OPT_mbranches_within_32B_boundaries)) {
1553 addArg(Twine("-x86-branches-within-32B-boundaries"));
1554 }
1555 if (const Arg *A = Args.getLastArg(options::OPT_malign_branch_boundary_EQ)) {
1556 StringRef Value = A->getValue();
1557 unsigned Boundary;
1558 if (Value.getAsInteger(10, Boundary) || Boundary < 16 ||
1559 !llvm::isPowerOf2_64(Boundary)) {
1560 D.Diag(diag::err_drv_invalid_argument_to_option)
1561 << Value << A->getOption().getName();
1562 } else {
1563 addArg("-x86-align-branch-boundary=" + Twine(Boundary));
1564 }
1565 }
1566 if (const Arg *A = Args.getLastArg(options::OPT_malign_branch_EQ)) {
1567 std::string AlignBranch;
1568 for (StringRef T : A->getValues()) {
1569 if (T != "fused" && T != "jcc" && T != "jmp" && T != "call" &&
1570 T != "ret" && T != "indirect")
1571 D.Diag(diag::err_drv_invalid_malign_branch_EQ)
1572 << T << "fused, jcc, jmp, call, ret, indirect";
1573 if (!AlignBranch.empty())
1574 AlignBranch += '+';
1575 AlignBranch += T;
1576 }
1577 addArg("-x86-align-branch=" + Twine(AlignBranch));
1578 }
1579 if (const Arg *A = Args.getLastArg(options::OPT_mpad_max_prefix_size_EQ)) {
1580 StringRef Value = A->getValue();
1581 unsigned PrefixSize;
1582 if (Value.getAsInteger(10, PrefixSize)) {
1583 D.Diag(diag::err_drv_invalid_argument_to_option)
1584 << Value << A->getOption().getName();
1585 } else {
1586 addArg("-x86-pad-max-prefix-size=" + Twine(PrefixSize));
1587 }
1588 }
1589}
1590
1591/// SDLSearch: Search for Static Device Library
1592/// The search for SDL bitcode files is consistent with how static host
1593/// libraries are discovered. That is, the -l option triggers a search for
1594/// files in a set of directories called the LINKPATH. The host library search
1595/// procedure looks for a specific filename in the LINKPATH. The filename for
1596/// a host library is lib<libname>.a or lib<libname>.so. For SDLs, there is an
1597/// ordered-set of filenames that are searched. We call this ordered-set of
1598/// filenames as SEARCH-ORDER. Since an SDL can either be device-type specific,
1599/// architecture specific, or generic across all architectures, a naming
1600/// convention and search order is used where the file name embeds the
1601/// architecture name <arch-name> (nvptx or amdgcn) and the GPU device type
1602/// <device-name> such as sm_30 and gfx906. <device-name> is absent in case of
1603/// device-independent SDLs. To reduce congestion in host library directories,
1604/// the search first looks for files in the “libdevice” subdirectory. SDLs that
1605/// are bc files begin with the prefix “lib”.
1606///
1607/// Machine-code SDLs can also be managed as an archive (*.a file). The
1608/// convention has been to use the prefix “lib”. To avoid confusion with host
1609/// archive libraries, we use prefix "libbc-" for the bitcode SDL archives.
1610///
1611bool tools::SDLSearch(const Driver &D, const llvm::opt::ArgList &DriverArgs,
1612 llvm::opt::ArgStringList &CC1Args,
1613 SmallVector<std::string, 8> LibraryPaths, std::string Lib,
1614 StringRef Arch, StringRef Target, bool isBitCodeSDL,
1615 bool postClangLink) {
1616 SmallVector<std::string, 12> SDLs;
1617
1618 std::string LibDeviceLoc = "/libdevice";
1619 std::string LibBcPrefix = "/libbc-";
1620 std::string LibPrefix = "/lib";
1621
1622 if (isBitCodeSDL) {
1623 // SEARCH-ORDER for Bitcode SDLs:
1624 // libdevice/libbc-<libname>-<arch-name>-<device-type>.a
1625 // libbc-<libname>-<arch-name>-<device-type>.a
1626 // libdevice/libbc-<libname>-<arch-name>.a
1627 // libbc-<libname>-<arch-name>.a
1628 // libdevice/libbc-<libname>.a
1629 // libbc-<libname>.a
1630 // libdevice/lib<libname>-<arch-name>-<device-type>.bc
1631 // lib<libname>-<arch-name>-<device-type>.bc
1632 // libdevice/lib<libname>-<arch-name>.bc
1633 // lib<libname>-<arch-name>.bc
1634 // libdevice/lib<libname>.bc
1635 // lib<libname>.bc
1636
1637 for (StringRef Base : {LibBcPrefix, LibPrefix}) {
1638 const auto *Ext = Base.contains(LibBcPrefix) ? ".a" : ".bc";
1639
1640 for (auto Suffix : {Twine(Lib + "-" + Arch + "-" + Target).str(),
1641 Twine(Lib + "-" + Arch).str(), Twine(Lib).str()}) {
1642 SDLs.push_back(Twine(LibDeviceLoc + Base + Suffix + Ext).str());
1643 SDLs.push_back(Twine(Base + Suffix + Ext).str());
1644 }
1645 }
1646 } else {
1647 // SEARCH-ORDER for Machine-code SDLs:
1648 // libdevice/lib<libname>-<arch-name>-<device-type>.a
1649 // lib<libname>-<arch-name>-<device-type>.a
1650 // libdevice/lib<libname>-<arch-name>.a
1651 // lib<libname>-<arch-name>.a
1652
1653 const auto *Ext = ".a";
1654
1655 for (auto Suffix : {Twine(Lib + "-" + Arch + "-" + Target).str(),
1656 Twine(Lib + "-" + Arch).str()}) {
1657 SDLs.push_back(Twine(LibDeviceLoc + LibPrefix + Suffix + Ext).str());
1658 SDLs.push_back(Twine(LibPrefix + Suffix + Ext).str());
1659 }
1660 }
1661
1662 // The CUDA toolchain does not use a global device llvm-link before the LLVM
1663 // backend generates ptx. So currently, the use of bitcode SDL for nvptx is
1664 // only possible with post-clang-cc1 linking. Clang cc1 has a feature that
1665 // will link libraries after clang compilation while the LLVM IR is still in
1666 // memory. This utilizes a clang cc1 option called “-mlink-builtin-bitcode”.
1667 // This is a clang -cc1 option that is generated by the clang driver. The
1668 // option value must a full path to an existing file.
1669 bool FoundSDL = false;
1670 for (auto LPath : LibraryPaths) {
1671 for (auto SDL : SDLs) {
1672 auto FullName = Twine(LPath + SDL).str();
1673 if (llvm::sys::fs::exists(FullName)) {
1674 if (postClangLink)
1675 CC1Args.push_back("-mlink-builtin-bitcode");
1676 CC1Args.push_back(DriverArgs.MakeArgString(FullName));
1677 FoundSDL = true;
1678 break;
1679 }
1680 }
1681 if (FoundSDL)
1682 break;
1683 }
1684 return FoundSDL;
1685}
1686
1687/// Search if a user provided archive file lib<libname>.a exists in any of
1688/// the library paths. If so, add a new command to clang-offload-bundler to
1689/// unbundle this archive and create a temporary device specific archive. Name
1690/// of this SDL is passed to the llvm-link (for amdgcn) or to the
1691/// clang-nvlink-wrapper (for nvptx) commands by the driver.
1692bool tools::GetSDLFromOffloadArchive(
1693 Compilation &C, const Driver &D, const Tool &T, const JobAction &JA,
1694 const InputInfoList &Inputs, const llvm::opt::ArgList &DriverArgs,
1695 llvm::opt::ArgStringList &CC1Args, SmallVector<std::string, 8> LibraryPaths,
1696 StringRef Lib, StringRef Arch, StringRef Target, bool isBitCodeSDL,
1697 bool postClangLink) {
1698
1699 // We don't support bitcode archive bundles for nvptx
1700 if (isBitCodeSDL && Arch.contains("nvptx"))
1701 return false;
1702
1703 bool FoundAOB = false;
1704 SmallVector<std::string, 2> AOBFileNames;
1705 std::string ArchiveOfBundles;
1706 for (auto LPath : LibraryPaths) {
1707 ArchiveOfBundles.clear();
1708
1709 AOBFileNames.push_back(Twine(LPath + "/libdevice/lib" + Lib + ".a").str());
1710 AOBFileNames.push_back(Twine(LPath + "/lib" + Lib + ".a").str());
1711
1712 for (auto AOB : AOBFileNames) {
1713 if (llvm::sys::fs::exists(AOB)) {
1714 ArchiveOfBundles = AOB;
1715 FoundAOB = true;
1716 break;
1717 }
1718 }
1719
1720 if (!FoundAOB)
1721 continue;
1722
1723 StringRef Prefix = isBitCodeSDL ? "libbc-" : "lib";
1724 std::string OutputLib = D.GetTemporaryPath(
1725 Twine(Prefix + Lib + "-" + Arch + "-" + Target).str(), "a");
1726
1727 C.addTempFile(C.getArgs().MakeArgString(OutputLib.c_str()));
1728
1729 ArgStringList CmdArgs;
1730 SmallString<128> DeviceTriple;
1731 DeviceTriple += Action::GetOffloadKindName(JA.getOffloadingDeviceKind());
1732 DeviceTriple += '-';
1733 std::string NormalizedTriple = T.getToolChain().getTriple().normalize();
1734 DeviceTriple += NormalizedTriple;
1735 if (!Target.empty()) {
1736 DeviceTriple += '-';
1737 DeviceTriple += Target;
1738 }
1739
1740 std::string UnbundleArg("-unbundle");
1741 std::string TypeArg("-type=a");
1742 std::string InputArg("-inputs=" + ArchiveOfBundles);
1743 std::string OffloadArg("-targets=" + std::string(DeviceTriple));
1744 std::string OutputArg("-outputs=" + OutputLib);
1745
1746 const char *UBProgram = DriverArgs.MakeArgString(
1747 T.getToolChain().GetProgramPath("clang-offload-bundler"));
1748
1749 ArgStringList UBArgs;
1750 UBArgs.push_back(C.getArgs().MakeArgString(UnbundleArg.c_str()));
1751 UBArgs.push_back(C.getArgs().MakeArgString(TypeArg.c_str()));
1752 UBArgs.push_back(C.getArgs().MakeArgString(InputArg.c_str()));
1753 UBArgs.push_back(C.getArgs().MakeArgString(OffloadArg.c_str()));
1754 UBArgs.push_back(C.getArgs().MakeArgString(OutputArg.c_str()));
1755
1756 // Add this flag to not exit from clang-offload-bundler if no compatible
1757 // code object is found in heterogenous archive library.
1758 std::string AdditionalArgs("-allow-missing-bundles");
1759 UBArgs.push_back(C.getArgs().MakeArgString(AdditionalArgs.c_str()));
1760
1761 C.addCommand(std::make_unique<Command>(
1762 JA, T, ResponseFileSupport::AtFileCurCP(), UBProgram, UBArgs, Inputs,
1763 InputInfo(&JA, C.getArgs().MakeArgString(OutputLib.c_str()))));
1764 if (postClangLink)
1765 CC1Args.push_back("-mlink-builtin-bitcode");
1766
1767 CC1Args.push_back(DriverArgs.MakeArgString(OutputLib));
1768 break;
1769 }
1770
1771 return FoundAOB;
1772}
1773
1774// Wrapper function used by driver for adding SDLs during link phase.
1775void tools::AddStaticDeviceLibsLinking(Compilation &C, const Tool &T,
1776 const JobAction &JA,
1777 const InputInfoList &Inputs,
1778 const llvm::opt::ArgList &DriverArgs,
1779 llvm::opt::ArgStringList &CC1Args,
1780 StringRef Arch, StringRef Target,
1781 bool isBitCodeSDL, bool postClangLink) {
1782 AddStaticDeviceLibs(&C, &T, &JA, &Inputs, C.getDriver(), DriverArgs, CC1Args,
1783 Arch, Target, isBitCodeSDL, postClangLink);
1784}
1785
1786// Wrapper function used for post clang linking of bitcode SDLS for nvptx by
1787// the CUDA toolchain.
1788void tools::AddStaticDeviceLibsPostLinking(const Driver &D,
1789 const llvm::opt::ArgList &DriverArgs,
1790 llvm::opt::ArgStringList &CC1Args,
1791 StringRef Arch, StringRef Target,
1792 bool isBitCodeSDL, bool postClangLink) {
1793 AddStaticDeviceLibs(nullptr, nullptr, nullptr, nullptr, D, DriverArgs,
1
Passing null pointer value via 1st parameter 'C'
2
Calling 'AddStaticDeviceLibs'
1794 CC1Args, Arch, Target, isBitCodeSDL, postClangLink);
1795}
1796
1797// User defined Static Device Libraries(SDLs) can be passed to clang for
1798// offloading GPU compilers. Like static host libraries, the use of a SDL is
1799// specified with the -l command line option. The primary difference between
1800// host and SDLs is the filenames for SDLs (refer SEARCH-ORDER for Bitcode SDLs
1801// and SEARCH-ORDER for Machine-code SDLs for the naming convention).
1802// SDLs are of following types:
1803//
1804// * Bitcode SDLs: They can either be a *.bc file or an archive of *.bc files.
1805// For NVPTX, these libraries are post-clang linked following each
1806// compilation. For AMDGPU, these libraries are linked one time
1807// during the application link phase.
1808//
1809// * Machine-code SDLs: They are archive files. For NVPTX, the archive members
1810// contain cubin for Nvidia GPUs and are linked one time during the
1811// link phase by the CUDA SDK linker called nvlink. For AMDGPU, the
1812// process for machine code SDLs is still in development. But they
1813// will be linked by the LLVM tool lld.
1814//
1815// * Bundled objects that contain both host and device codes: Bundled objects
1816// may also contain library code compiled from source. For NVPTX, the
1817// bundle contains cubin. For AMDGPU, the bundle contains bitcode.
1818//
1819// For Bitcode and Machine-code SDLs, current compiler toolchains hardcode the
1820// inclusion of specific SDLs such as math libraries and the OpenMP device
1821// library libomptarget.
1822void tools::AddStaticDeviceLibs(Compilation *C, const Tool *T,
1823 const JobAction *JA,
1824 const InputInfoList *Inputs, const Driver &D,
1825 const llvm::opt::ArgList &DriverArgs,
1826 llvm::opt::ArgStringList &CC1Args,
1827 StringRef Arch, StringRef Target,
1828 bool isBitCodeSDL, bool postClangLink) {
1829
1830 SmallVector<std::string, 8> LibraryPaths;
1831 // Add search directories from LIBRARY_PATH env variable
1832 llvm::Optional<std::string> LibPath =
1833 llvm::sys::Process::GetEnv("LIBRARY_PATH");
1834 if (LibPath) {
3
Assuming the condition is false
4
Taking false branch
1835 SmallVector<StringRef, 8> Frags;
1836 const char EnvPathSeparatorStr[] = {llvm::sys::EnvPathSeparator, '\0'};
1837 llvm::SplitString(*LibPath, Frags, EnvPathSeparatorStr);
1838 for (StringRef Path : Frags)
1839 LibraryPaths.emplace_back(Path.trim());
1840 }
1841
1842 // Add directories from user-specified -L options
1843 for (std::string Search_Dir : DriverArgs.getAllArgValues(options::OPT_L))
1844 LibraryPaths.emplace_back(Search_Dir);
1845
1846 // Add path to lib-debug folders
1847 SmallString<256> DefaultLibPath = llvm::sys::path::parent_path(D.Dir);
1848 llvm::sys::path::append(DefaultLibPath, Twine("lib") + CLANG_LIBDIR_SUFFIX"");
1849 LibraryPaths.emplace_back(DefaultLibPath.c_str());
1850
1851 // Build list of Static Device Libraries SDLs specified by -l option
1852 llvm::SmallSet<std::string, 16> SDLNames;
1853 static const StringRef HostOnlyArchives[] = {
1854 "omp", "cudart", "m", "gcc", "gcc_s", "pthread", "hip_hcc"};
1855 for (auto SDLName : DriverArgs.getAllArgValues(options::OPT_l)) {
1856 if (!HostOnlyArchives->contains(SDLName)) {
1857 SDLNames.insert(SDLName);
1858 }
1859 }
1860
1861 // The search stops as soon as an SDL file is found. The driver then provides
1862 // the full filename of the SDL to the llvm-link or clang-nvlink-wrapper
1863 // command. If no SDL is found after searching each LINKPATH with
1864 // SEARCH-ORDER, it is possible that an archive file lib<libname>.a exists
1865 // and may contain bundled object files.
1866 for (auto SDLName : SDLNames) {
1867 // This is the only call to SDLSearch
1868 if (!SDLSearch(D, DriverArgs, CC1Args, LibraryPaths, SDLName, Arch, Target,
5
Assuming the condition is true
6
Taking true branch
1869 isBitCodeSDL, postClangLink)) {
1870 GetSDLFromOffloadArchive(*C, D, *T, *JA, *Inputs, DriverArgs, CC1Args,
7
Forming reference to null pointer
1871 LibraryPaths, SDLName, Arch, Target,
1872 isBitCodeSDL, postClangLink);
1873 }
1874 }
1875}
1876
1877static llvm::opt::Arg *
1878getAMDGPUCodeObjectArgument(const Driver &D, const llvm::opt::ArgList &Args) {
1879 // The last of -mcode-object-v3, -mno-code-object-v3 and
1880 // -mcode-object-version=<version> wins.
1881 return Args.getLastArg(options::OPT_mcode_object_v3_legacy,
1882 options::OPT_mno_code_object_v3_legacy,
1883 options::OPT_mcode_object_version_EQ);
1884}
1885
1886void tools::checkAMDGPUCodeObjectVersion(const Driver &D,
1887 const llvm::opt::ArgList &Args) {
1888 const unsigned MinCodeObjVer = 2;
1889 const unsigned MaxCodeObjVer = 4;
1890
1891 // Emit warnings for legacy options even if they are overridden.
1892 if (Args.hasArg(options::OPT_mno_code_object_v3_legacy))
1893 D.Diag(diag::warn_drv_deprecated_arg) << "-mno-code-object-v3"
1894 << "-mcode-object-version=2";
1895
1896 if (Args.hasArg(options::OPT_mcode_object_v3_legacy))
1897 D.Diag(diag::warn_drv_deprecated_arg) << "-mcode-object-v3"
1898 << "-mcode-object-version=3";
1899
1900 if (auto *CodeObjArg = getAMDGPUCodeObjectArgument(D, Args)) {
1901 if (CodeObjArg->getOption().getID() ==
1902 options::OPT_mcode_object_version_EQ) {
1903 unsigned CodeObjVer = MaxCodeObjVer;
1904 auto Remnant =
1905 StringRef(CodeObjArg->getValue()).getAsInteger(0, CodeObjVer);
1906 if (Remnant || CodeObjVer < MinCodeObjVer || CodeObjVer > MaxCodeObjVer)
1907 D.Diag(diag::err_drv_invalid_int_value)
1908 << CodeObjArg->getAsString(Args) << CodeObjArg->getValue();
1909 }
1910 }
1911}
1912
1913unsigned tools::getAMDGPUCodeObjectVersion(const Driver &D,
1914 const llvm::opt::ArgList &Args) {
1915 unsigned CodeObjVer = 4; // default
1916 if (auto *CodeObjArg = getAMDGPUCodeObjectArgument(D, Args)) {
1917 if (CodeObjArg->getOption().getID() ==
1918 options::OPT_mno_code_object_v3_legacy) {
1919 CodeObjVer = 2;
1920 } else if (CodeObjArg->getOption().getID() ==
1921 options::OPT_mcode_object_v3_legacy) {
1922 CodeObjVer = 3;
1923 } else {
1924 StringRef(CodeObjArg->getValue()).getAsInteger(0, CodeObjVer);
1925 }
1926 }
1927 return CodeObjVer;
1928}
1929
1930bool tools::haveAMDGPUCodeObjectVersionArgument(
1931 const Driver &D, const llvm::opt::ArgList &Args) {
1932 return getAMDGPUCodeObjectArgument(D, Args) != nullptr;
1933}
1934
1935void tools::addMachineOutlinerArgs(const Driver &D,
1936 const llvm::opt::ArgList &Args,
1937 llvm::opt::ArgStringList &CmdArgs,
1938 const llvm::Triple &Triple, bool IsLTO) {
1939 auto addArg = [&, IsLTO](const Twine &Arg) {
1940 if (IsLTO) {
1941 CmdArgs.push_back(Args.MakeArgString("-plugin-opt=" + Arg));
1942 } else {
1943 CmdArgs.push_back("-mllvm");
1944 CmdArgs.push_back(Args.MakeArgString(Arg));
1945 }
1946 };
1947
1948 if (Arg *A = Args.getLastArg(options::OPT_moutline,
1949 options::OPT_mno_outline)) {
1950 if (A->getOption().matches(options::OPT_moutline)) {
1951 // We only support -moutline in AArch64 and ARM targets right now. If
1952 // we're not compiling for these, emit a warning and ignore the flag.
1953 // Otherwise, add the proper mllvm flags.
1954 if (!(Triple.isARM() || Triple.isThumb() ||
1955 Triple.getArch() == llvm::Triple::aarch64 ||
1956 Triple.getArch() == llvm::Triple::aarch64_32)) {
1957 D.Diag(diag::warn_drv_moutline_unsupported_opt) << Triple.getArchName();
1958 } else {
1959 addArg(Twine("-enable-machine-outliner"));
1960 }
1961 } else {
1962 // Disable all outlining behaviour.
1963 addArg(Twine("-enable-machine-outliner=never"));
1964 }
1965 }
1966}
1967
1968void tools::addOpenMPDeviceRTL(const Driver &D,
1969 const llvm::opt::ArgList &DriverArgs,
1970 llvm::opt::ArgStringList &CC1Args,
1971 StringRef BitcodeSuffix,
1972 const llvm::Triple &Triple) {
1973 SmallVector<StringRef, 8> LibraryPaths;
1974
1975 // Add path to clang lib / lib64 folder.
1976 SmallString<256> DefaultLibPath = llvm::sys::path::parent_path(D.Dir);
1977 llvm::sys::path::append(DefaultLibPath, Twine("lib") + CLANG_LIBDIR_SUFFIX"");
1978 LibraryPaths.emplace_back(DefaultLibPath.c_str());
1979
1980 // Add user defined library paths from LIBRARY_PATH.
1981 llvm::Optional<std::string> LibPath =
1982 llvm::sys::Process::GetEnv("LIBRARY_PATH");
1983 if (LibPath) {
1984 SmallVector<StringRef, 8> Frags;
1985 const char EnvPathSeparatorStr[] = {llvm::sys::EnvPathSeparator, '\0'};
1986 llvm::SplitString(*LibPath, Frags, EnvPathSeparatorStr);
1987 for (StringRef Path : Frags)
1988 LibraryPaths.emplace_back(Path.trim());
1989 }
1990
1991 OptSpecifier LibomptargetBCPathOpt =
1992 Triple.isAMDGCN() ? options::OPT_libomptarget_amdgcn_bc_path_EQ
1993 : options::OPT_libomptarget_nvptx_bc_path_EQ;
1994
1995 StringRef ArchPrefix = Triple.isAMDGCN() ? "amdgcn" : "nvptx";
1996 std::string LibOmpTargetName = "libomptarget-" + BitcodeSuffix.str() + ".bc";
1997
1998 // First check whether user specifies bc library
1999 if (const Arg *A = DriverArgs.getLastArg(LibomptargetBCPathOpt)) {
2000 SmallString<128> LibOmpTargetFile(A->getValue());
2001 if (llvm::sys::fs::exists(LibOmpTargetFile) &&
2002 llvm::sys::fs::is_directory(LibOmpTargetFile)) {
2003 llvm::sys::path::append(LibOmpTargetFile, LibOmpTargetName);
2004 }
2005
2006 if (llvm::sys::fs::exists(LibOmpTargetFile)) {
2007 CC1Args.push_back("-mlink-builtin-bitcode");
2008 CC1Args.push_back(DriverArgs.MakeArgString(LibOmpTargetFile));
2009 } else {
2010 D.Diag(diag::err_drv_omp_offload_target_bcruntime_not_found)
2011 << LibOmpTargetFile;
2012 }
2013 } else {
2014 bool FoundBCLibrary = false;
2015
2016 for (StringRef LibraryPath : LibraryPaths) {
2017 SmallString<128> LibOmpTargetFile(LibraryPath);
2018 llvm::sys::path::append(LibOmpTargetFile, LibOmpTargetName);
2019 if (llvm::sys::fs::exists(LibOmpTargetFile)) {
2020 CC1Args.push_back("-mlink-builtin-bitcode");
2021 CC1Args.push_back(DriverArgs.MakeArgString(LibOmpTargetFile));
2022 FoundBCLibrary = true;
2023 break;
2024 }
2025 }
2026
2027 if (!FoundBCLibrary)
2028 D.Diag(diag::err_drv_omp_offload_target_missingbcruntime)
2029 << LibOmpTargetName << ArchPrefix;
2030 }
2031}