1 //===--- Fuchsia.cpp - Fuchsia ToolChain Implementations --------*- 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 "Fuchsia.h"
10 #include "CommonArgs.h"
11 #include "clang/Config/config.h"
12 #include "clang/Driver/Compilation.h"
13 #include "clang/Driver/Driver.h"
14 #include "clang/Driver/DriverDiagnostic.h"
15 #include "clang/Driver/MultilibBuilder.h"
16 #include "clang/Driver/Options.h"
17 #include "clang/Driver/SanitizerArgs.h"
18 #include "llvm/Option/ArgList.h"
19 #include "llvm/ProfileData/InstrProf.h"
20 #include "llvm/Support/FileSystem.h"
21 #include "llvm/Support/Path.h"
22 #include "llvm/Support/VirtualFileSystem.h"
23
24 using namespace clang::driver;
25 using namespace clang::driver::toolchains;
26 using namespace clang::driver::tools;
27 using namespace clang;
28 using namespace llvm::opt;
29
30 using tools::addMultilibFlag;
31
ConstructJob(Compilation & C,const JobAction & JA,const InputInfo & Output,const InputInfoList & Inputs,const ArgList & Args,const char * LinkingOutput) const32 void fuchsia::Linker::ConstructJob(Compilation &C, const JobAction &JA,
33 const InputInfo &Output,
34 const InputInfoList &Inputs,
35 const ArgList &Args,
36 const char *LinkingOutput) const {
37 const auto &ToolChain = static_cast<const Fuchsia &>(getToolChain());
38 const Driver &D = ToolChain.getDriver();
39
40 const llvm::Triple &Triple = ToolChain.getEffectiveTriple();
41
42 ArgStringList CmdArgs;
43
44 // Silence warning for "clang -g foo.o -o foo"
45 Args.ClaimAllArgs(options::OPT_g_Group);
46 // and "clang -emit-llvm foo.o -o foo"
47 Args.ClaimAllArgs(options::OPT_emit_llvm);
48 // and for "clang -w foo.o -o foo". Other warning options are already
49 // handled somewhere else.
50 Args.ClaimAllArgs(options::OPT_w);
51
52 CmdArgs.push_back("-z");
53 CmdArgs.push_back("max-page-size=4096");
54
55 CmdArgs.push_back("-z");
56 CmdArgs.push_back("now");
57
58 CmdArgs.push_back("-z");
59 CmdArgs.push_back("start-stop-visibility=hidden");
60
61 const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
62 if (llvm::sys::path::filename(Exec).equals_insensitive("ld.lld") ||
63 llvm::sys::path::stem(Exec).equals_insensitive("ld.lld")) {
64 CmdArgs.push_back("-z");
65 CmdArgs.push_back("rodynamic");
66 CmdArgs.push_back("-z");
67 CmdArgs.push_back("separate-loadable-segments");
68 CmdArgs.push_back("-z");
69 CmdArgs.push_back("rel");
70 CmdArgs.push_back("--pack-dyn-relocs=relr");
71 }
72
73 if (!D.SysRoot.empty())
74 CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
75
76 if (!Args.hasArg(options::OPT_shared) && !Args.hasArg(options::OPT_r))
77 CmdArgs.push_back("-pie");
78
79 if (Args.hasArg(options::OPT_rdynamic))
80 CmdArgs.push_back("-export-dynamic");
81
82 if (Args.hasArg(options::OPT_s))
83 CmdArgs.push_back("-s");
84
85 if (Args.hasArg(options::OPT_r)) {
86 CmdArgs.push_back("-r");
87 } else {
88 CmdArgs.push_back("--build-id");
89 CmdArgs.push_back("--hash-style=gnu");
90 }
91
92 if (ToolChain.getArch() == llvm::Triple::aarch64) {
93 CmdArgs.push_back("--execute-only");
94
95 std::string CPU = getCPUName(D, Args, Triple);
96 if (CPU.empty() || CPU == "generic" || CPU == "cortex-a53")
97 CmdArgs.push_back("--fix-cortex-a53-843419");
98 }
99
100 CmdArgs.push_back("--eh-frame-hdr");
101
102 if (Args.hasArg(options::OPT_static))
103 CmdArgs.push_back("-Bstatic");
104 else if (Args.hasArg(options::OPT_shared))
105 CmdArgs.push_back("-shared");
106
107 const SanitizerArgs &SanArgs = ToolChain.getSanitizerArgs(Args);
108
109 if (!Args.hasArg(options::OPT_shared) && !Args.hasArg(options::OPT_r)) {
110 std::string Dyld = D.DyldPrefix;
111 if (SanArgs.needsAsanRt() && SanArgs.needsSharedRt())
112 Dyld += "asan/";
113 if (SanArgs.needsHwasanRt() && SanArgs.needsSharedRt())
114 Dyld += "hwasan/";
115 if (SanArgs.needsTsanRt() && SanArgs.needsSharedRt())
116 Dyld += "tsan/";
117 Dyld += "ld.so.1";
118 CmdArgs.push_back("-dynamic-linker");
119 CmdArgs.push_back(Args.MakeArgString(Dyld));
120 }
121
122 if (Triple.isRISCV64()) {
123 CmdArgs.push_back("-X");
124 if (Args.hasArg(options::OPT_mno_relax))
125 CmdArgs.push_back("--no-relax");
126 }
127
128 CmdArgs.push_back("-o");
129 CmdArgs.push_back(Output.getFilename());
130
131 if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles,
132 options::OPT_r)) {
133 if (!Args.hasArg(options::OPT_shared)) {
134 CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("Scrt1.o")));
135 }
136 }
137
138 Args.addAllArgs(CmdArgs, {options::OPT_L, options::OPT_u});
139
140 ToolChain.AddFilePathLibArgs(Args, CmdArgs);
141
142 if (D.isUsingLTO()) {
143 assert(!Inputs.empty() && "Must have at least one input.");
144 // Find the first filename InputInfo object.
145 auto Input = llvm::find_if(
146 Inputs, [](const InputInfo &II) -> bool { return II.isFilename(); });
147 if (Input == Inputs.end())
148 // For a very rare case, all of the inputs to the linker are
149 // InputArg. If that happens, just use the first InputInfo.
150 Input = Inputs.begin();
151
152 addLTOOptions(ToolChain, Args, CmdArgs, Output, *Input,
153 D.getLTOMode() == LTOK_Thin);
154 }
155
156 addLinkerCompressDebugSectionsOption(ToolChain, Args, CmdArgs);
157 AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
158
159 if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs,
160 options::OPT_r)) {
161 if (Args.hasArg(options::OPT_static))
162 CmdArgs.push_back("-Bdynamic");
163
164 if (D.CCCIsCXX()) {
165 if (ToolChain.ShouldLinkCXXStdlib(Args)) {
166 bool OnlyLibstdcxxStatic = Args.hasArg(options::OPT_static_libstdcxx) &&
167 !Args.hasArg(options::OPT_static);
168 CmdArgs.push_back("--push-state");
169 CmdArgs.push_back("--as-needed");
170 if (OnlyLibstdcxxStatic)
171 CmdArgs.push_back("-Bstatic");
172 ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
173 if (OnlyLibstdcxxStatic)
174 CmdArgs.push_back("-Bdynamic");
175 CmdArgs.push_back("-lm");
176 CmdArgs.push_back("--pop-state");
177 }
178 }
179
180 // Note that Fuchsia never needs to link in sanitizer runtime deps. Any
181 // sanitizer runtimes with system dependencies use the `.deplibs` feature
182 // instead.
183 addSanitizerRuntimes(ToolChain, Args, CmdArgs);
184
185 addXRayRuntime(ToolChain, Args, CmdArgs);
186
187 ToolChain.addProfileRTLibs(Args, CmdArgs);
188
189 AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
190
191 if (Args.hasArg(options::OPT_pthread) ||
192 Args.hasArg(options::OPT_pthreads))
193 CmdArgs.push_back("-lpthread");
194
195 if (Args.hasArg(options::OPT_fsplit_stack))
196 CmdArgs.push_back("--wrap=pthread_create");
197
198 if (!Args.hasArg(options::OPT_nolibc))
199 CmdArgs.push_back("-lc");
200 }
201
202 C.addCommand(std::make_unique<Command>(JA, *this,
203 ResponseFileSupport::AtFileCurCP(),
204 Exec, CmdArgs, Inputs, Output));
205 }
206
ConstructJob(Compilation & C,const JobAction & JA,const InputInfo & Output,const InputInfoList & Inputs,const ArgList & Args,const char * LinkingOutput) const207 void fuchsia::StaticLibTool::ConstructJob(Compilation &C, const JobAction &JA,
208 const InputInfo &Output,
209 const InputInfoList &Inputs,
210 const ArgList &Args,
211 const char *LinkingOutput) const {
212 const Driver &D = getToolChain().getDriver();
213
214 // Silence warning for "clang -g foo.o -o foo"
215 Args.ClaimAllArgs(options::OPT_g_Group);
216 // and "clang -emit-llvm foo.o -o foo"
217 Args.ClaimAllArgs(options::OPT_emit_llvm);
218 // and for "clang -w foo.o -o foo". Other warning options are already
219 // handled somewhere else.
220 Args.ClaimAllArgs(options::OPT_w);
221 // Silence warnings when linking C code with a C++ '-stdlib' argument.
222 Args.ClaimAllArgs(options::OPT_stdlib_EQ);
223
224 // ar tool command "llvm-ar <options> <output_file> <input_files>".
225 ArgStringList CmdArgs;
226 // Create and insert file members with a deterministic index.
227 CmdArgs.push_back("rcsD");
228 CmdArgs.push_back(Output.getFilename());
229
230 for (const auto &II : Inputs) {
231 if (II.isFilename()) {
232 CmdArgs.push_back(II.getFilename());
233 }
234 }
235
236 // Delete old output archive file if it already exists before generating a new
237 // archive file.
238 const char *OutputFileName = Output.getFilename();
239 if (Output.isFilename() && llvm::sys::fs::exists(OutputFileName)) {
240 if (std::error_code EC = llvm::sys::fs::remove(OutputFileName)) {
241 D.Diag(diag::err_drv_unable_to_remove_file) << EC.message();
242 return;
243 }
244 }
245
246 const char *Exec = Args.MakeArgString(getToolChain().GetStaticLibToolPath());
247 C.addCommand(std::make_unique<Command>(JA, *this,
248 ResponseFileSupport::AtFileCurCP(),
249 Exec, CmdArgs, Inputs, Output));
250 }
251
252 /// Fuchsia - Fuchsia tool chain which can call as(1) and ld(1) directly.
253
Fuchsia(const Driver & D,const llvm::Triple & Triple,const ArgList & Args)254 Fuchsia::Fuchsia(const Driver &D, const llvm::Triple &Triple,
255 const ArgList &Args)
256 : ToolChain(D, Triple, Args) {
257 getProgramPaths().push_back(getDriver().Dir);
258
259 if (!D.SysRoot.empty()) {
260 SmallString<128> P(D.SysRoot);
261 llvm::sys::path::append(P, "lib");
262 getFilePaths().push_back(std::string(P));
263 }
264
265 auto FilePaths = [&](const Multilib &M) -> std::vector<std::string> {
266 std::vector<std::string> FP;
267 if (std::optional<std::string> Path = getStdlibPath()) {
268 SmallString<128> P(*Path);
269 llvm::sys::path::append(P, M.gccSuffix());
270 FP.push_back(std::string(P));
271 }
272 return FP;
273 };
274
275 Multilibs.push_back(Multilib());
276 // Use the noexcept variant with -fno-exceptions to avoid the extra overhead.
277 Multilibs.push_back(MultilibBuilder("noexcept", {}, {})
278 .flag("-fexceptions", /*Disallow=*/true)
279 .flag("-fno-exceptions")
280 .makeMultilib());
281 // ASan has higher priority because we always want the instrumentated version.
282 Multilibs.push_back(MultilibBuilder("asan", {}, {})
283 .flag("-fsanitize=address")
284 .makeMultilib());
285 // Use the asan+noexcept variant with ASan and -fno-exceptions.
286 Multilibs.push_back(MultilibBuilder("asan+noexcept", {}, {})
287 .flag("-fsanitize=address")
288 .flag("-fexceptions", /*Disallow=*/true)
289 .flag("-fno-exceptions")
290 .makeMultilib());
291 // HWASan has higher priority because we always want the instrumentated
292 // version.
293 Multilibs.push_back(MultilibBuilder("hwasan", {}, {})
294 .flag("-fsanitize=hwaddress")
295 .makeMultilib());
296 // Use the hwasan+noexcept variant with HWASan and -fno-exceptions.
297 Multilibs.push_back(MultilibBuilder("hwasan+noexcept", {}, {})
298 .flag("-fsanitize=hwaddress")
299 .flag("-fexceptions", /*Disallow=*/true)
300 .flag("-fno-exceptions")
301 .makeMultilib());
302 // Use Itanium C++ ABI for the compat multilib.
303 Multilibs.push_back(MultilibBuilder("compat", {}, {})
304 .flag("-fc++-abi=itanium")
305 .makeMultilib());
306
307 Multilibs.FilterOut([&](const Multilib &M) {
308 std::vector<std::string> RD = FilePaths(M);
309 return llvm::all_of(RD, [&](std::string P) { return !getVFS().exists(P); });
310 });
311
312 Multilib::flags_list Flags;
313 bool Exceptions =
314 Args.hasFlag(options::OPT_fexceptions, options::OPT_fno_exceptions, true);
315 addMultilibFlag(Exceptions, "-fexceptions", Flags);
316 addMultilibFlag(!Exceptions, "-fno-exceptions", Flags);
317 addMultilibFlag(getSanitizerArgs(Args).needsAsanRt(), "-fsanitize=address",
318 Flags);
319 addMultilibFlag(getSanitizerArgs(Args).needsHwasanRt(),
320 "-fsanitize=hwaddress", Flags);
321
322 addMultilibFlag(Args.getLastArgValue(options::OPT_fcxx_abi_EQ) == "itanium",
323 "-fc++-abi=itanium", Flags);
324
325 Multilibs.setFilePathsCallback(FilePaths);
326
327 if (Multilibs.select(Flags, SelectedMultilibs)) {
328 // Ensure that -print-multi-directory only outputs one multilib directory.
329 Multilib LastSelected = SelectedMultilibs.back();
330 SelectedMultilibs = {LastSelected};
331
332 if (!SelectedMultilibs.back().isDefault())
333 if (const auto &PathsCallback = Multilibs.filePathsCallback())
334 for (const auto &Path : PathsCallback(SelectedMultilibs.back()))
335 // Prepend the multilib path to ensure it takes the precedence.
336 getFilePaths().insert(getFilePaths().begin(), Path);
337 }
338 }
339
ComputeEffectiveClangTriple(const ArgList & Args,types::ID InputType) const340 std::string Fuchsia::ComputeEffectiveClangTriple(const ArgList &Args,
341 types::ID InputType) const {
342 llvm::Triple Triple(ComputeLLVMTriple(Args, InputType));
343 return Triple.str();
344 }
345
buildLinker() const346 Tool *Fuchsia::buildLinker() const {
347 return new tools::fuchsia::Linker(*this);
348 }
349
buildStaticLibTool() const350 Tool *Fuchsia::buildStaticLibTool() const {
351 return new tools::fuchsia::StaticLibTool(*this);
352 }
353
GetRuntimeLibType(const ArgList & Args) const354 ToolChain::RuntimeLibType Fuchsia::GetRuntimeLibType(
355 const ArgList &Args) const {
356 if (Arg *A = Args.getLastArg(clang::driver::options::OPT_rtlib_EQ)) {
357 StringRef Value = A->getValue();
358 if (Value != "compiler-rt")
359 getDriver().Diag(clang::diag::err_drv_invalid_rtlib_name)
360 << A->getAsString(Args);
361 }
362
363 return ToolChain::RLT_CompilerRT;
364 }
365
366 ToolChain::CXXStdlibType
GetCXXStdlibType(const ArgList & Args) const367 Fuchsia::GetCXXStdlibType(const ArgList &Args) const {
368 if (Arg *A = Args.getLastArg(options::OPT_stdlib_EQ)) {
369 StringRef Value = A->getValue();
370 if (Value != "libc++")
371 getDriver().Diag(diag::err_drv_invalid_stdlib_name)
372 << A->getAsString(Args);
373 }
374
375 return ToolChain::CST_Libcxx;
376 }
377
addClangTargetOptions(const ArgList & DriverArgs,ArgStringList & CC1Args,Action::OffloadKind) const378 void Fuchsia::addClangTargetOptions(const ArgList &DriverArgs,
379 ArgStringList &CC1Args,
380 Action::OffloadKind) const {
381 if (!DriverArgs.hasFlag(options::OPT_fuse_init_array,
382 options::OPT_fno_use_init_array, true))
383 CC1Args.push_back("-fno-use-init-array");
384 }
385
AddClangSystemIncludeArgs(const ArgList & DriverArgs,ArgStringList & CC1Args) const386 void Fuchsia::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
387 ArgStringList &CC1Args) const {
388 const Driver &D = getDriver();
389
390 if (DriverArgs.hasArg(options::OPT_nostdinc))
391 return;
392
393 if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
394 SmallString<128> P(D.ResourceDir);
395 llvm::sys::path::append(P, "include");
396 addSystemInclude(DriverArgs, CC1Args, P);
397 }
398
399 if (DriverArgs.hasArg(options::OPT_nostdlibinc))
400 return;
401
402 // Check for configure-time C include directories.
403 StringRef CIncludeDirs(C_INCLUDE_DIRS);
404 if (CIncludeDirs != "") {
405 SmallVector<StringRef, 5> dirs;
406 CIncludeDirs.split(dirs, ":");
407 for (StringRef dir : dirs) {
408 StringRef Prefix =
409 llvm::sys::path::is_absolute(dir) ? "" : StringRef(D.SysRoot);
410 addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir);
411 }
412 return;
413 }
414
415 if (!D.SysRoot.empty()) {
416 SmallString<128> P(D.SysRoot);
417 llvm::sys::path::append(P, "include");
418 addExternCSystemInclude(DriverArgs, CC1Args, P.str());
419 }
420 }
421
AddClangCXXStdlibIncludeArgs(const ArgList & DriverArgs,ArgStringList & CC1Args) const422 void Fuchsia::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
423 ArgStringList &CC1Args) const {
424 if (DriverArgs.hasArg(options::OPT_nostdinc, options::OPT_nostdlibinc,
425 options::OPT_nostdincxx))
426 return;
427
428 const Driver &D = getDriver();
429 std::string Target = getTripleString();
430
431 auto AddCXXIncludePath = [&](StringRef Path) {
432 std::string Version = detectLibcxxVersion(Path);
433 if (Version.empty())
434 return;
435
436 // First add the per-target multilib include dir.
437 if (!SelectedMultilibs.empty() && !SelectedMultilibs.back().isDefault()) {
438 const Multilib &M = SelectedMultilibs.back();
439 SmallString<128> TargetDir(Path);
440 llvm::sys::path::append(TargetDir, Target, M.gccSuffix(), "c++", Version);
441 if (getVFS().exists(TargetDir)) {
442 addSystemInclude(DriverArgs, CC1Args, TargetDir);
443 }
444 }
445
446 // Second add the per-target include dir.
447 SmallString<128> TargetDir(Path);
448 llvm::sys::path::append(TargetDir, Target, "c++", Version);
449 if (getVFS().exists(TargetDir))
450 addSystemInclude(DriverArgs, CC1Args, TargetDir);
451
452 // Third the generic one.
453 SmallString<128> Dir(Path);
454 llvm::sys::path::append(Dir, "c++", Version);
455 addSystemInclude(DriverArgs, CC1Args, Dir);
456 };
457
458 switch (GetCXXStdlibType(DriverArgs)) {
459 case ToolChain::CST_Libcxx: {
460 SmallString<128> P(D.Dir);
461 llvm::sys::path::append(P, "..", "include");
462 AddCXXIncludePath(P);
463 break;
464 }
465
466 default:
467 llvm_unreachable("invalid stdlib name");
468 }
469 }
470
AddCXXStdlibLibArgs(const ArgList & Args,ArgStringList & CmdArgs) const471 void Fuchsia::AddCXXStdlibLibArgs(const ArgList &Args,
472 ArgStringList &CmdArgs) const {
473 switch (GetCXXStdlibType(Args)) {
474 case ToolChain::CST_Libcxx:
475 CmdArgs.push_back("-lc++");
476 if (Args.hasArg(options::OPT_fexperimental_library))
477 CmdArgs.push_back("-lc++experimental");
478 break;
479
480 case ToolChain::CST_Libstdcxx:
481 llvm_unreachable("invalid stdlib name");
482 }
483 }
484
getSupportedSanitizers() const485 SanitizerMask Fuchsia::getSupportedSanitizers() const {
486 SanitizerMask Res = ToolChain::getSupportedSanitizers();
487 Res |= SanitizerKind::Address;
488 Res |= SanitizerKind::HWAddress;
489 Res |= SanitizerKind::PointerCompare;
490 Res |= SanitizerKind::PointerSubtract;
491 Res |= SanitizerKind::Fuzzer;
492 Res |= SanitizerKind::FuzzerNoLink;
493 Res |= SanitizerKind::Leak;
494 Res |= SanitizerKind::SafeStack;
495 Res |= SanitizerKind::Scudo;
496 Res |= SanitizerKind::Thread;
497 return Res;
498 }
499
getDefaultSanitizers() const500 SanitizerMask Fuchsia::getDefaultSanitizers() const {
501 SanitizerMask Res;
502 switch (getTriple().getArch()) {
503 case llvm::Triple::aarch64:
504 case llvm::Triple::riscv64:
505 Res |= SanitizerKind::ShadowCallStack;
506 break;
507 case llvm::Triple::x86_64:
508 Res |= SanitizerKind::SafeStack;
509 break;
510 default:
511 break;
512 }
513 return Res;
514 }
515