1//===-- MSVC.cpp - MSVC ToolChain Implementations -------------------------===//
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 "MSVC.h"
10#include "Darwin.h"
11#include "clang/Config/config.h"
12#include "clang/Driver/CommonArgs.h"
13#include "clang/Driver/Compilation.h"
14#include "clang/Driver/Driver.h"
15#include "clang/Driver/Options.h"
16#include "clang/Driver/SanitizerArgs.h"
17#include "llvm/Option/Arg.h"
18#include "llvm/Option/ArgList.h"
19#include "llvm/Support/ConvertUTF.h"
20#include "llvm/Support/ErrorHandling.h"
21#include "llvm/Support/FileSystem.h"
22#include "llvm/Support/Path.h"
23#include "llvm/Support/Process.h"
24#include "llvm/Support/VirtualFileSystem.h"
25#include "llvm/TargetParser/Host.h"
26#include <cstdio>
27
28#ifdef _WIN32
29 #define WIN32_LEAN_AND_MEAN
30 #define NOGDI
31 #ifndef NOMINMAX
32 #define NOMINMAX
33 #endif
34 #include <windows.h>
35#endif
36
37using namespace clang::driver;
38using namespace clang::driver::toolchains;
39using namespace clang::driver::tools;
40using namespace clang;
41using namespace llvm::opt;
42
43static bool canExecute(llvm::vfs::FileSystem &VFS, StringRef Path) {
44 auto Status = VFS.status(Path);
45 if (!Status)
46 return false;
47 return (Status->getPermissions() & llvm::sys::fs::perms::all_exe) != 0;
48}
49
50// Try to find Exe from a Visual Studio distribution. This first tries to find
51// an installed copy of Visual Studio and, failing that, looks in the PATH,
52// making sure that whatever executable that's found is not a same-named exe
53// from clang itself to prevent clang from falling back to itself.
54static std::string FindVisualStudioExecutable(const ToolChain &TC,
55 const char *Exe) {
56 const auto &MSVC = static_cast<const toolchains::MSVCToolChain &>(TC);
57 SmallString<128> FilePath(
58 MSVC.getSubDirectoryPath(Type: llvm::SubDirectoryType::Bin));
59 llvm::sys::path::append(path&: FilePath, a: Exe);
60 return std::string(canExecute(VFS&: TC.getVFS(), Path: FilePath) ? FilePath.str() : Exe);
61}
62
63void visualstudio::Linker::ConstructJob(Compilation &C, const JobAction &JA,
64 const InputInfo &Output,
65 const InputInfoList &Inputs,
66 const ArgList &Args,
67 const char *LinkingOutput) const {
68 ArgStringList CmdArgs;
69
70 auto &TC = static_cast<const toolchains::MSVCToolChain &>(getToolChain());
71
72 assert((Output.isFilename() || Output.isNothing()) && "invalid output");
73 if (Output.isFilename())
74 CmdArgs.push_back(
75 Elt: Args.MakeArgString(Str: std::string("-out:") + Output.getFilename()));
76
77 if (Args.hasArg(Ids: options::OPT_marm64x))
78 CmdArgs.push_back(Elt: "-machine:arm64x");
79 else if (TC.getTriple().isWindowsArm64EC())
80 CmdArgs.push_back(Elt: "-machine:arm64ec");
81
82 if (const Arg *A = Args.getLastArg(Ids: options::OPT_fveclib)) {
83 StringRef V = A->getValue();
84 if (V == "ArmPL")
85 CmdArgs.push_back(Elt: Args.MakeArgString(Str: "--dependent-lib=amath"));
86 }
87
88 if (!Args.hasArg(Ids: options::OPT_nostdlib, Ids: options::OPT_nostartfiles) &&
89 !C.getDriver().IsCLMode() && !C.getDriver().IsFlangMode()) {
90 CmdArgs.push_back(Elt: "-defaultlib:libcmt");
91 CmdArgs.push_back(Elt: "-defaultlib:oldnames");
92 }
93
94 // If the VC environment hasn't been configured (perhaps because the user
95 // did not run vcvarsall), try to build a consistent link environment. If
96 // the environment variable is set however, assume the user knows what
97 // they're doing. If the user passes /vctoolsdir or /winsdkdir, trust that
98 // over env vars.
99 if (const Arg *A = Args.getLastArg(Ids: options::OPT__SLASH_diasdkdir,
100 Ids: options::OPT__SLASH_winsysroot)) {
101 // cl.exe doesn't find the DIA SDK automatically, so this too requires
102 // explicit flags and doesn't automatically look in "DIA SDK" relative
103 // to the path we found for VCToolChainPath.
104 llvm::SmallString<128> DIAPath(A->getValue());
105 if (A->getOption().getID() == options::OPT__SLASH_winsysroot)
106 llvm::sys::path::append(path&: DIAPath, a: "DIA SDK");
107
108 // The DIA SDK always uses the legacy vc arch, even in new MSVC versions.
109 llvm::sys::path::append(path&: DIAPath, a: "lib",
110 b: llvm::archToLegacyVCArch(Arch: TC.getArch()));
111 CmdArgs.push_back(Elt: Args.MakeArgString(Str: Twine("-libpath:") + DIAPath));
112 }
113 if (!llvm::sys::Process::GetEnv(name: "LIB") ||
114 Args.hasArg(Ids: options::OPT__SLASH_vctoolsdir,
115 Ids: options::OPT__SLASH_vctoolsversion,
116 Ids: options::OPT__SLASH_winsysroot)) {
117 CmdArgs.push_back(Elt: Args.MakeArgString(
118 Str: Twine("-libpath:") +
119 TC.getSubDirectoryPath(Type: llvm::SubDirectoryType::Lib)));
120 CmdArgs.push_back(Elt: Args.MakeArgString(
121 Str: Twine("-libpath:") +
122 TC.getSubDirectoryPath(Type: llvm::SubDirectoryType::Lib, SubdirParent: "atlmfc")));
123 }
124 if (!llvm::sys::Process::GetEnv(name: "LIB") ||
125 Args.hasArg(Ids: options::OPT__SLASH_winsdkdir,
126 Ids: options::OPT__SLASH_winsdkversion,
127 Ids: options::OPT__SLASH_winsysroot)) {
128 if (TC.useUniversalCRT()) {
129 std::string UniversalCRTLibPath;
130 if (TC.getUniversalCRTLibraryPath(Args, path&: UniversalCRTLibPath))
131 CmdArgs.push_back(
132 Elt: Args.MakeArgString(Str: Twine("-libpath:") + UniversalCRTLibPath));
133 }
134 std::string WindowsSdkLibPath;
135 if (TC.getWindowsSDKLibraryPath(Args, path&: WindowsSdkLibPath))
136 CmdArgs.push_back(
137 Elt: Args.MakeArgString(Str: std::string("-libpath:") + WindowsSdkLibPath));
138 }
139
140 if (!C.getDriver().IsCLMode() && Args.hasArg(Ids: options::OPT_L))
141 for (const auto &LibPath : Args.getAllArgValues(Id: options::OPT_L))
142 CmdArgs.push_back(Elt: Args.MakeArgString(Str: "-libpath:" + LibPath));
143
144 if (C.getDriver().IsFlangMode() &&
145 !Args.hasArg(Ids: options::OPT_nostdlib, Ids: options::OPT_nodefaultlibs)) {
146 TC.addFortranRuntimeLibraryPath(Args, CmdArgs);
147 TC.addFortranRuntimeLibs(Args, CmdArgs);
148
149 // Inform the MSVC linker that we're generating a console application, i.e.
150 // one with `main` as the "user-defined" entry point. The `main` function is
151 // defined in flang's runtime libraries.
152 CmdArgs.push_back(Elt: "/subsystem:console");
153 }
154
155 // Add the compiler-rt library directories to libpath if they exist to help
156 // the linker find the various sanitizer, builtin, and profiling runtimes.
157 for (const auto &LibPath : TC.getLibraryPaths()) {
158 if (TC.getVFS().exists(Path: LibPath))
159 CmdArgs.push_back(Elt: Args.MakeArgString(Str: "-libpath:" + LibPath));
160 }
161 auto CRTPath = TC.getCompilerRTPath();
162 if (TC.getVFS().exists(Path: CRTPath))
163 CmdArgs.push_back(Elt: Args.MakeArgString(Str: "-libpath:" + CRTPath));
164
165 CmdArgs.push_back(Elt: "-nologo");
166
167 if (Args.hasArg(Ids: options::OPT_g_Group, Ids: options::OPT__SLASH_Z7))
168 CmdArgs.push_back(Elt: "-debug");
169
170 // If we specify /hotpatch, let the linker add padding in front of each
171 // function, like MSVC does.
172 if (Args.hasArg(Ids: options::OPT_fms_hotpatch, Ids: options::OPT__SLASH_hotpatch))
173 CmdArgs.push_back(Elt: "-functionpadmin");
174
175 // Pass on /Brepro if it was passed to the compiler.
176 // Note that /Brepro maps to -mno-incremental-linker-compatible.
177 bool DefaultIncrementalLinkerCompatible =
178 C.getDefaultToolChain().getTriple().isWindowsMSVCEnvironment();
179 if (!Args.hasFlag(Pos: options::OPT_mincremental_linker_compatible,
180 Neg: options::OPT_mno_incremental_linker_compatible,
181 Default: DefaultIncrementalLinkerCompatible))
182 CmdArgs.push_back(Elt: "-Brepro");
183
184 bool DLL = Args.hasArg(Ids: options::OPT__SLASH_LD, Ids: options::OPT__SLASH_LDd,
185 Ids: options::OPT_shared);
186 if (DLL) {
187 CmdArgs.push_back(Elt: Args.MakeArgString(Str: "-dll"));
188
189 SmallString<128> ImplibName(Output.getFilename());
190 llvm::sys::path::replace_extension(path&: ImplibName, extension: "lib");
191 CmdArgs.push_back(Elt: Args.MakeArgString(Str: std::string("-implib:") + ImplibName));
192 }
193
194 if (TC.getSanitizerArgs(JobArgs: Args).needsFuzzer()) {
195 if (!Args.hasArg(Ids: options::OPT_shared))
196 CmdArgs.push_back(
197 Elt: Args.MakeArgString(Str: std::string("-wholearchive:") +
198 TC.getCompilerRTArgString(Args, Component: "fuzzer")));
199 CmdArgs.push_back(Elt: Args.MakeArgString(Str: "-debug"));
200 // Prevent the linker from padding sections we use for instrumentation
201 // arrays.
202 CmdArgs.push_back(Elt: Args.MakeArgString(Str: "-incremental:no"));
203 }
204
205 if (TC.getSanitizerArgs(JobArgs: Args).needsAsanRt()) {
206 CmdArgs.push_back(Elt: Args.MakeArgString(Str: "-debug"));
207 CmdArgs.push_back(Elt: Args.MakeArgString(Str: "-incremental:no"));
208 CmdArgs.push_back(Elt: TC.getCompilerRTArgString(Args, Component: "asan_dynamic"));
209 auto defines = Args.getAllArgValues(Id: options::OPT_D);
210 if (Args.hasArg(Ids: options::OPT__SLASH_MD, Ids: options::OPT__SLASH_MDd) ||
211 llvm::is_contained(Range&: defines, Element: "_DLL")) {
212 // Make sure the dynamic runtime thunk is not optimized out at link time
213 // to ensure proper SEH handling.
214 CmdArgs.push_back(Elt: Args.MakeArgString(
215 Str: TC.getArch() == llvm::Triple::x86
216 ? "-include:___asan_seh_interceptor"
217 : "-include:__asan_seh_interceptor"));
218 // Make sure the linker consider all object files from the dynamic runtime
219 // thunk.
220 CmdArgs.push_back(Elt: Args.MakeArgString(
221 Str: std::string("-wholearchive:") +
222 TC.getCompilerRT(Args, Component: "asan_dynamic_runtime_thunk")));
223 } else {
224 // Make sure the linker consider all object files from the static runtime
225 // thunk.
226 CmdArgs.push_back(Elt: Args.MakeArgString(
227 Str: std::string("-wholearchive:") +
228 TC.getCompilerRT(Args, Component: "asan_static_runtime_thunk")));
229 }
230 }
231
232 if (C.getDriver().isUsingLTO()) {
233 if (Arg *A = tools::getLastProfileSampleUseArg(Args))
234 CmdArgs.push_back(Elt: Args.MakeArgString(Str: std::string("-lto-sample-profile:") +
235 A->getValue()));
236 }
237 Args.AddAllArgValues(Output&: CmdArgs, Id0: options::OPT__SLASH_link);
238
239 // Control Flow Guard checks
240 for (const Arg *A : Args.filtered(Ids: options::OPT__SLASH_guard)) {
241 StringRef GuardArgs = A->getValue();
242 if (GuardArgs.equals_insensitive(RHS: "cf") ||
243 GuardArgs.equals_insensitive(RHS: "cf,nochecks")) {
244 // MSVC doesn't yet support the "nochecks" modifier.
245 CmdArgs.push_back(Elt: "-guard:cf");
246 } else if (GuardArgs.equals_insensitive(RHS: "cf-")) {
247 CmdArgs.push_back(Elt: "-guard:cf-");
248 } else if (GuardArgs.equals_insensitive(RHS: "ehcont")) {
249 CmdArgs.push_back(Elt: "-guard:ehcont");
250 } else if (GuardArgs.equals_insensitive(RHS: "ehcont-")) {
251 CmdArgs.push_back(Elt: "-guard:ehcont-");
252 }
253 }
254
255 if (Args.hasFlag(Pos: options::OPT_fopenmp, PosAlias: options::OPT_fopenmp_EQ,
256 Neg: options::OPT_fno_openmp, Default: false)) {
257 CmdArgs.push_back(Elt: "-nodefaultlib:vcomp.lib");
258 CmdArgs.push_back(Elt: "-nodefaultlib:vcompd.lib");
259 CmdArgs.push_back(Elt: Args.MakeArgString(Str: std::string("-libpath:") +
260 TC.getDriver().Dir + "/../lib"));
261 switch (TC.getDriver().getOpenMPRuntime(Args)) {
262 case Driver::OMPRT_OMP:
263 CmdArgs.push_back(Elt: "-defaultlib:libomp.lib");
264 break;
265 case Driver::OMPRT_IOMP5:
266 CmdArgs.push_back(Elt: "-defaultlib:libiomp5md.lib");
267 break;
268 case Driver::OMPRT_GOMP:
269 break;
270 case Driver::OMPRT_Unknown:
271 // Already diagnosed.
272 break;
273 }
274 }
275
276 // Add compiler-rt lib in case if it was explicitly
277 // specified as an argument for --rtlib option.
278 if (!Args.hasArg(Ids: options::OPT_nostdlib)) {
279 AddRunTimeLibs(TC, D: TC.getDriver(), CmdArgs, Args);
280 }
281
282 StringRef Linker =
283 Args.getLastArgValue(Id: options::OPT_fuse_ld_EQ, CLANG_DEFAULT_LINKER);
284 if (Linker.empty())
285 Linker = "link";
286 // We need to translate 'lld' into 'lld-link'.
287 else if (Linker.equals_insensitive(RHS: "lld"))
288 Linker = "lld-link";
289
290 if (Linker == "lld-link") {
291 for (Arg *A : Args.filtered(Ids: options::OPT_vfsoverlay))
292 CmdArgs.push_back(
293 Elt: Args.MakeArgString(Str: std::string("/vfsoverlay:") + A->getValue()));
294
295 if (C.getDriver().isUsingLTO() &&
296 Args.hasFlag(Pos: options::OPT_gsplit_dwarf, Neg: options::OPT_gno_split_dwarf,
297 Default: false))
298 CmdArgs.push_back(Elt: Args.MakeArgString(Str: Twine("/dwodir:") +
299 Output.getFilename() + "_dwo"));
300 }
301
302 // Add filenames, libraries, and other linker inputs.
303 for (const auto &Input : Inputs) {
304 if (Input.isFilename()) {
305 CmdArgs.push_back(Elt: Input.getFilename());
306 continue;
307 }
308
309 const Arg &A = Input.getInputArg();
310
311 // Render -l options differently for the MSVC linker.
312 if (A.getOption().matches(ID: options::OPT_l)) {
313 StringRef Lib = A.getValue();
314 const char *LinkLibArg;
315 if (Lib.ends_with(Suffix: ".lib"))
316 LinkLibArg = Args.MakeArgString(Str: Lib);
317 else
318 LinkLibArg = Args.MakeArgString(Str: Lib + ".lib");
319 CmdArgs.push_back(Elt: LinkLibArg);
320 continue;
321 }
322
323 // Otherwise, this is some other kind of linker input option like -Wl, -z,
324 // or -L. Render it, even if MSVC doesn't understand it.
325 A.renderAsInput(Args, Output&: CmdArgs);
326 }
327
328 addHIPRuntimeLibArgs(TC, C, Args, CmdArgs);
329
330 TC.addProfileRTLibs(Args, CmdArgs);
331
332 std::vector<const char *> Environment;
333
334 // We need to special case some linker paths. In the case of the regular msvc
335 // linker, we need to use a special search algorithm.
336 llvm::SmallString<128> linkPath;
337 if (Linker.equals_insensitive(RHS: "link")) {
338 // If we're using the MSVC linker, it's not sufficient to just use link
339 // from the program PATH, because other environments like GnuWin32 install
340 // their own link.exe which may come first.
341 linkPath = FindVisualStudioExecutable(TC, Exe: "link.exe");
342
343 if (!TC.FoundMSVCInstall() && !canExecute(VFS&: TC.getVFS(), Path: linkPath)) {
344 llvm::SmallString<128> ClPath;
345 ClPath = TC.GetProgramPath(Name: "cl.exe");
346 if (canExecute(VFS&: TC.getVFS(), Path: ClPath)) {
347 linkPath = llvm::sys::path::parent_path(path: ClPath);
348 llvm::sys::path::append(path&: linkPath, a: "link.exe");
349 if (!canExecute(VFS&: TC.getVFS(), Path: linkPath))
350 C.getDriver().Diag(DiagID: clang::diag::warn_drv_msvc_not_found);
351 } else {
352 C.getDriver().Diag(DiagID: clang::diag::warn_drv_msvc_not_found);
353 }
354 }
355
356 // Clang handles passing the proper asan libs to the linker, which goes
357 // against link.exe's /INFERASANLIBS which automatically finds asan libs.
358 if (TC.getSanitizerArgs(JobArgs: Args).needsAsanRt())
359 CmdArgs.push_back(Elt: "/INFERASANLIBS:NO");
360
361#ifdef _WIN32
362 // When cross-compiling with VS2017 or newer, link.exe expects to have
363 // its containing bin directory at the top of PATH, followed by the
364 // native target bin directory.
365 // e.g. when compiling for x86 on an x64 host, PATH should start with:
366 // /bin/Hostx64/x86;/bin/Hostx64/x64
367 // This doesn't attempt to handle llvm::ToolsetLayout::DevDivInternal.
368 if (TC.getIsVS2017OrNewer() &&
369 llvm::Triple(llvm::sys::getProcessTriple()).getArch() != TC.getArch()) {
370 auto HostArch = llvm::Triple(llvm::sys::getProcessTriple()).getArch();
371
372 auto EnvBlockWide =
373 std::unique_ptr<wchar_t[], decltype(&FreeEnvironmentStringsW)>(
374 GetEnvironmentStringsW(), FreeEnvironmentStringsW);
375 if (!EnvBlockWide)
376 goto SkipSettingEnvironment;
377
378 size_t EnvCount = 0;
379 size_t EnvBlockLen = 0;
380 while (EnvBlockWide[EnvBlockLen] != L'\0') {
381 ++EnvCount;
382 EnvBlockLen += std::wcslen(&EnvBlockWide[EnvBlockLen]) +
383 1 /*string null-terminator*/;
384 }
385 ++EnvBlockLen; // add the block null-terminator
386
387 std::string EnvBlock;
388 if (!llvm::convertUTF16ToUTF8String(
389 llvm::ArrayRef<char>(reinterpret_cast<char *>(EnvBlockWide.get()),
390 EnvBlockLen * sizeof(EnvBlockWide[0])),
391 EnvBlock))
392 goto SkipSettingEnvironment;
393
394 Environment.reserve(EnvCount);
395
396 // Now loop over each string in the block and copy them into the
397 // environment vector, adjusting the PATH variable as needed when we
398 // find it.
399 for (const char *Cursor = EnvBlock.data(); *Cursor != '\0';) {
400 llvm::StringRef EnvVar(Cursor);
401 if (EnvVar.starts_with_insensitive("path=")) {
402 constexpr size_t PrefixLen = 5; // strlen("path=")
403 Environment.push_back(Args.MakeArgString(
404 EnvVar.substr(0, PrefixLen) +
405 TC.getSubDirectoryPath(llvm::SubDirectoryType::Bin) +
406 llvm::Twine(llvm::sys::EnvPathSeparator) +
407 TC.getSubDirectoryPath(llvm::SubDirectoryType::Bin, HostArch) +
408 (EnvVar.size() > PrefixLen
409 ? llvm::Twine(llvm::sys::EnvPathSeparator) +
410 EnvVar.substr(PrefixLen)
411 : "")));
412 } else {
413 Environment.push_back(Args.MakeArgString(EnvVar));
414 }
415 Cursor += EnvVar.size() + 1 /*null-terminator*/;
416 }
417 }
418 SkipSettingEnvironment:;
419#endif
420 } else {
421 linkPath = TC.GetProgramPath(Name: Linker.str().c_str());
422 }
423
424 auto LinkCmd = std::make_unique<Command>(
425 args: JA, args: *this, args: ResponseFileSupport::AtFileUTF16(),
426 args: Args.MakeArgString(Str: linkPath), args&: CmdArgs, args: Inputs, args: Output);
427 if (!Environment.empty())
428 LinkCmd->setEnvironment(Environment);
429 C.addCommand(C: std::move(LinkCmd));
430}
431
432MSVCToolChain::MSVCToolChain(const Driver &D, const llvm::Triple &Triple,
433 const ArgList &Args)
434 : ToolChain(D, Triple, Args), CudaInstallation(D, Triple, Args),
435 RocmInstallation(D, Triple, Args), SYCLInstallation(D, Triple, Args) {
436 getProgramPaths().push_back(Elt: getDriver().Dir);
437
438 std::optional<llvm::StringRef> VCToolsDir, VCToolsVersion;
439 if (Arg *A = Args.getLastArg(Ids: options::OPT__SLASH_vctoolsdir))
440 VCToolsDir = A->getValue();
441 if (Arg *A = Args.getLastArg(Ids: options::OPT__SLASH_vctoolsversion))
442 VCToolsVersion = A->getValue();
443 if (Arg *A = Args.getLastArg(Ids: options::OPT__SLASH_winsdkdir))
444 WinSdkDir = A->getValue();
445 if (Arg *A = Args.getLastArg(Ids: options::OPT__SLASH_winsdkversion))
446 WinSdkVersion = A->getValue();
447 if (Arg *A = Args.getLastArg(Ids: options::OPT__SLASH_winsysroot))
448 WinSysRoot = A->getValue();
449
450 // Check the command line first, that's the user explicitly telling us what to
451 // use. Check the environment next, in case we're being invoked from a VS
452 // command prompt. Failing that, just try to find the newest Visual Studio
453 // version we can and use its default VC toolchain.
454 llvm::findVCToolChainViaCommandLine(VFS&: getVFS(), VCToolsDir, VCToolsVersion,
455 WinSysRoot, Path&: VCToolChainPath, VSLayout) ||
456 llvm::findVCToolChainViaEnvironment(VFS&: getVFS(), Path&: VCToolChainPath,
457 VSLayout) ||
458 llvm::findVCToolChainViaSetupConfig(VFS&: getVFS(), VCToolsVersion,
459 Path&: VCToolChainPath, VSLayout) ||
460 llvm::findVCToolChainViaRegistry(Path&: VCToolChainPath, VSLayout);
461}
462
463Tool *MSVCToolChain::buildLinker() const {
464 return new tools::visualstudio::Linker(*this);
465}
466
467Tool *MSVCToolChain::buildAssembler() const {
468 if (getTriple().isOSBinFormatMachO())
469 return new tools::darwin::Assembler(*this);
470 getDriver().Diag(DiagID: clang::diag::err_no_external_assembler);
471 return nullptr;
472}
473
474ToolChain::UnwindTableLevel
475MSVCToolChain::getDefaultUnwindTableLevel(const ArgList &Args) const {
476 // Don't emit unwind tables by default for MachO targets.
477 if (getTriple().isOSBinFormatMachO())
478 return UnwindTableLevel::None;
479
480 // All non-x86_32 Windows targets require unwind tables. However, LLVM
481 // doesn't know how to generate them for all targets, so only enable
482 // the ones that are actually implemented.
483 if (getArch() == llvm::Triple::x86_64 || getArch() == llvm::Triple::arm ||
484 getArch() == llvm::Triple::thumb || getArch() == llvm::Triple::aarch64)
485 return UnwindTableLevel::Asynchronous;
486
487 return UnwindTableLevel::None;
488}
489
490bool MSVCToolChain::isPICDefault() const {
491 return getArch() == llvm::Triple::x86_64 ||
492 getArch() == llvm::Triple::aarch64;
493}
494
495bool MSVCToolChain::isPIEDefault(const llvm::opt::ArgList &Args) const {
496 return false;
497}
498
499bool MSVCToolChain::isPICDefaultForced() const {
500 return getArch() == llvm::Triple::x86_64 ||
501 getArch() == llvm::Triple::aarch64;
502}
503
504void MSVCToolChain::AddCudaIncludeArgs(const ArgList &DriverArgs,
505 ArgStringList &CC1Args) const {
506 CudaInstallation->AddCudaIncludeArgs(DriverArgs, CC1Args);
507}
508
509void MSVCToolChain::AddHIPIncludeArgs(const ArgList &DriverArgs,
510 ArgStringList &CC1Args) const {
511 RocmInstallation->AddHIPIncludeArgs(DriverArgs, CC1Args);
512}
513
514void MSVCToolChain::addSYCLIncludeArgs(const ArgList &DriverArgs,
515 ArgStringList &CC1Args) const {
516 SYCLInstallation->addSYCLIncludeArgs(DriverArgs, CC1Args);
517}
518
519void MSVCToolChain::AddHIPRuntimeLibArgs(const ArgList &Args,
520 ArgStringList &CmdArgs) const {
521 CmdArgs.append(IL: {Args.MakeArgString(Str: StringRef("-libpath:") +
522 RocmInstallation->getLibPath()),
523 "amdhip64.lib"});
524}
525
526void MSVCToolChain::printVerboseInfo(raw_ostream &OS) const {
527 CudaInstallation->print(OS);
528 RocmInstallation->print(OS);
529}
530
531std::string
532MSVCToolChain::getSubDirectoryPath(llvm::SubDirectoryType Type,
533 llvm::StringRef SubdirParent) const {
534 return llvm::getSubDirectoryPath(Type, VSLayout, VCToolChainPath, TargetArch: getArch(),
535 SubdirParent);
536}
537
538std::string
539MSVCToolChain::getSubDirectoryPath(llvm::SubDirectoryType Type,
540 llvm::Triple::ArchType TargetArch) const {
541 return llvm::getSubDirectoryPath(Type, VSLayout, VCToolChainPath, TargetArch,
542 SubdirParent: "");
543}
544
545// Find the most recent version of Universal CRT or Windows 10 SDK.
546// vcvarsqueryregistry.bat from Visual Studio 2015 sorts entries in the include
547// directory by name and uses the last one of the list.
548// So we compare entry names lexicographically to find the greatest one.
549// Gets the library path required to link against the Windows SDK.
550bool MSVCToolChain::getWindowsSDKLibraryPath(const ArgList &Args,
551 std::string &path) const {
552 std::string sdkPath;
553 int sdkMajor = 0;
554 std::string windowsSDKIncludeVersion;
555 std::string windowsSDKLibVersion;
556
557 path.clear();
558 if (!llvm::getWindowsSDKDir(VFS&: getVFS(), WinSdkDir, WinSdkVersion, WinSysRoot,
559 Path&: sdkPath, Major&: sdkMajor, WindowsSDKIncludeVersion&: windowsSDKIncludeVersion,
560 WindowsSDKLibVersion&: windowsSDKLibVersion))
561 return false;
562
563 llvm::SmallString<128> libPath(sdkPath);
564 llvm::sys::path::append(path&: libPath, a: "Lib");
565 if (sdkMajor >= 10)
566 if (!(WinSdkDir.has_value() || WinSysRoot.has_value()) &&
567 WinSdkVersion.has_value())
568 windowsSDKLibVersion = *WinSdkVersion;
569 if (sdkMajor >= 8)
570 llvm::sys::path::append(path&: libPath, a: windowsSDKLibVersion, b: "um");
571 return llvm::appendArchToWindowsSDKLibPath(SDKMajor: sdkMajor, LibPath: libPath, Arch: getArch(),
572 path);
573}
574
575bool MSVCToolChain::useUniversalCRT() const {
576 return llvm::useUniversalCRT(VSLayout, VCToolChainPath, TargetArch: getArch(), VFS&: getVFS());
577}
578
579bool MSVCToolChain::getUniversalCRTLibraryPath(const ArgList &Args,
580 std::string &Path) const {
581 std::string UniversalCRTSdkPath;
582 std::string UCRTVersion;
583
584 Path.clear();
585 if (!llvm::getUniversalCRTSdkDir(VFS&: getVFS(), WinSdkDir, WinSdkVersion,
586 WinSysRoot, Path&: UniversalCRTSdkPath,
587 UCRTVersion))
588 return false;
589
590 if (!(WinSdkDir.has_value() || WinSysRoot.has_value()) &&
591 WinSdkVersion.has_value())
592 UCRTVersion = *WinSdkVersion;
593
594 StringRef ArchName = llvm::archToWindowsSDKArch(Arch: getArch());
595 if (ArchName.empty())
596 return false;
597
598 llvm::SmallString<128> LibPath(UniversalCRTSdkPath);
599 llvm::sys::path::append(path&: LibPath, a: "Lib", b: UCRTVersion, c: "ucrt", d: ArchName);
600
601 Path = std::string(LibPath);
602 return true;
603}
604
605static VersionTuple getMSVCVersionFromExe(const std::string &BinDir) {
606 VersionTuple Version;
607#ifdef _WIN32
608 SmallString<128> ClExe(BinDir);
609 llvm::sys::path::append(ClExe, "cl.exe");
610
611 std::wstring ClExeWide;
612 if (!llvm::ConvertUTF8toWide(ClExe.c_str(), ClExeWide))
613 return Version;
614
615 const DWORD VersionSize = ::GetFileVersionInfoSizeW(ClExeWide.c_str(),
616 nullptr);
617 if (VersionSize == 0)
618 return Version;
619
620 SmallVector<uint8_t, 4 * 1024> VersionBlock(VersionSize);
621 if (!::GetFileVersionInfoW(ClExeWide.c_str(), 0, VersionSize,
622 VersionBlock.data()))
623 return Version;
624
625 VS_FIXEDFILEINFO *FileInfo = nullptr;
626 UINT FileInfoSize = 0;
627 if (!::VerQueryValueW(VersionBlock.data(), L"\\",
628 reinterpret_cast<LPVOID *>(&FileInfo), &FileInfoSize) ||
629 FileInfoSize < sizeof(*FileInfo))
630 return Version;
631
632 const unsigned Major = (FileInfo->dwFileVersionMS >> 16) & 0xFFFF;
633 const unsigned Minor = (FileInfo->dwFileVersionMS ) & 0xFFFF;
634 const unsigned Micro = (FileInfo->dwFileVersionLS >> 16) & 0xFFFF;
635
636 Version = VersionTuple(Major, Minor, Micro);
637#endif
638 return Version;
639}
640
641void MSVCToolChain::AddSystemIncludeWithSubfolder(
642 const ArgList &DriverArgs, ArgStringList &CC1Args,
643 const std::string &folder, const Twine &subfolder1, const Twine &subfolder2,
644 const Twine &subfolder3) const {
645 llvm::SmallString<128> path(folder);
646 llvm::sys::path::append(path, a: subfolder1, b: subfolder2, c: subfolder3);
647 addSystemInclude(DriverArgs, CC1Args, Path: path);
648}
649
650void MSVCToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
651 ArgStringList &CC1Args) const {
652 if (DriverArgs.hasArg(Ids: options::OPT_nostdinc))
653 return;
654
655 if (!DriverArgs.hasArg(Ids: options::OPT_nobuiltininc)) {
656 AddSystemIncludeWithSubfolder(DriverArgs, CC1Args, folder: getDriver().ResourceDir,
657 subfolder1: "include");
658 }
659
660 // Add %INCLUDE%-like directories from the -imsvc flag.
661 for (const auto &Path : DriverArgs.getAllArgValues(Id: options::OPT__SLASH_imsvc))
662 addSystemInclude(DriverArgs, CC1Args, Path);
663
664 auto AddSystemIncludesFromEnv = [&](StringRef Var) -> bool {
665 if (auto Val = llvm::sys::Process::GetEnv(name: Var)) {
666 SmallVector<StringRef, 8> Dirs;
667 StringRef(*Val).split(A&: Dirs, Separator: ";", /*MaxSplit=*/-1, /*KeepEmpty=*/false);
668 if (!Dirs.empty()) {
669 addSystemIncludes(DriverArgs, CC1Args, Paths: Dirs);
670 return true;
671 }
672 }
673 return false;
674 };
675
676 // Add %INCLUDE%-like dirs via /external:env: flags.
677 for (const auto &Var :
678 DriverArgs.getAllArgValues(Id: options::OPT__SLASH_external_env)) {
679 AddSystemIncludesFromEnv(Var);
680 }
681
682 // Add DIA SDK include if requested.
683 if (const Arg *A = DriverArgs.getLastArg(Ids: options::OPT__SLASH_diasdkdir,
684 Ids: options::OPT__SLASH_winsysroot)) {
685 // cl.exe doesn't find the DIA SDK automatically, so this too requires
686 // explicit flags and doesn't automatically look in "DIA SDK" relative
687 // to the path we found for VCToolChainPath.
688 llvm::SmallString<128> DIASDKPath(A->getValue());
689 if (A->getOption().getID() == options::OPT__SLASH_winsysroot)
690 llvm::sys::path::append(path&: DIASDKPath, a: "DIA SDK");
691 AddSystemIncludeWithSubfolder(DriverArgs, CC1Args, folder: std::string(DIASDKPath),
692 subfolder1: "include");
693 }
694
695 if (DriverArgs.hasArg(Ids: options::OPT_nostdlibinc))
696 return;
697
698 // Honor %INCLUDE% and %EXTERNAL_INCLUDE%. It should have essential search
699 // paths set by vcvarsall.bat. Skip if the user expressly set any of the
700 // Windows SDK or VC Tools options.
701 if (!DriverArgs.hasArg(
702 Ids: options::OPT__SLASH_vctoolsdir, Ids: options::OPT__SLASH_vctoolsversion,
703 Ids: options::OPT__SLASH_winsysroot, Ids: options::OPT__SLASH_winsdkdir,
704 Ids: options::OPT__SLASH_winsdkversion)) {
705 bool Found = AddSystemIncludesFromEnv("INCLUDE");
706 Found |= AddSystemIncludesFromEnv("EXTERNAL_INCLUDE");
707 if (Found)
708 return;
709 }
710
711 // When built with access to the proper Windows APIs, try to actually find
712 // the correct include paths first.
713 if (!VCToolChainPath.empty()) {
714 addSystemInclude(DriverArgs, CC1Args,
715 Path: getSubDirectoryPath(Type: llvm::SubDirectoryType::Include));
716 addSystemInclude(
717 DriverArgs, CC1Args,
718 Path: getSubDirectoryPath(Type: llvm::SubDirectoryType::Include, SubdirParent: "atlmfc"));
719
720 if (useUniversalCRT()) {
721 std::string UniversalCRTSdkPath;
722 std::string UCRTVersion;
723 if (llvm::getUniversalCRTSdkDir(VFS&: getVFS(), WinSdkDir, WinSdkVersion,
724 WinSysRoot, Path&: UniversalCRTSdkPath,
725 UCRTVersion)) {
726 if (!(WinSdkDir.has_value() || WinSysRoot.has_value()) &&
727 WinSdkVersion.has_value())
728 UCRTVersion = *WinSdkVersion;
729 AddSystemIncludeWithSubfolder(DriverArgs, CC1Args, folder: UniversalCRTSdkPath,
730 subfolder1: "Include", subfolder2: UCRTVersion, subfolder3: "ucrt");
731 }
732 }
733
734 std::string WindowsSDKDir;
735 int major = 0;
736 std::string windowsSDKIncludeVersion;
737 std::string windowsSDKLibVersion;
738 if (llvm::getWindowsSDKDir(VFS&: getVFS(), WinSdkDir, WinSdkVersion, WinSysRoot,
739 Path&: WindowsSDKDir, Major&: major, WindowsSDKIncludeVersion&: windowsSDKIncludeVersion,
740 WindowsSDKLibVersion&: windowsSDKLibVersion)) {
741 if (major >= 10)
742 if (!(WinSdkDir.has_value() || WinSysRoot.has_value()) &&
743 WinSdkVersion.has_value())
744 windowsSDKIncludeVersion = windowsSDKLibVersion = *WinSdkVersion;
745 if (major >= 8) {
746 // Note: windowsSDKIncludeVersion is empty for SDKs prior to v10.
747 // Anyway, llvm::sys::path::append is able to manage it.
748 AddSystemIncludeWithSubfolder(DriverArgs, CC1Args, folder: WindowsSDKDir,
749 subfolder1: "Include", subfolder2: windowsSDKIncludeVersion,
750 subfolder3: "shared");
751 AddSystemIncludeWithSubfolder(DriverArgs, CC1Args, folder: WindowsSDKDir,
752 subfolder1: "Include", subfolder2: windowsSDKIncludeVersion,
753 subfolder3: "um");
754 AddSystemIncludeWithSubfolder(DriverArgs, CC1Args, folder: WindowsSDKDir,
755 subfolder1: "Include", subfolder2: windowsSDKIncludeVersion,
756 subfolder3: "winrt");
757 if (major >= 10) {
758 llvm::VersionTuple Tuple;
759 if (!Tuple.tryParse(string: windowsSDKIncludeVersion) &&
760 Tuple.getSubminor().value_or(u: 0) >= 17134) {
761 AddSystemIncludeWithSubfolder(DriverArgs, CC1Args, folder: WindowsSDKDir,
762 subfolder1: "Include", subfolder2: windowsSDKIncludeVersion,
763 subfolder3: "cppwinrt");
764 }
765 }
766 } else {
767 AddSystemIncludeWithSubfolder(DriverArgs, CC1Args, folder: WindowsSDKDir,
768 subfolder1: "Include");
769 }
770 }
771
772 return;
773 }
774
775#if defined(_WIN32)
776 // As a fallback, select default install paths.
777 // FIXME: Don't guess drives and paths like this on Windows.
778 const StringRef Paths[] = {
779 "C:/Program Files/Microsoft Visual Studio 10.0/VC/include",
780 "C:/Program Files/Microsoft Visual Studio 9.0/VC/include",
781 "C:/Program Files/Microsoft Visual Studio 9.0/VC/PlatformSDK/Include",
782 "C:/Program Files/Microsoft Visual Studio 8/VC/include",
783 "C:/Program Files/Microsoft Visual Studio 8/VC/PlatformSDK/Include"
784 };
785 addSystemIncludes(DriverArgs, CC1Args, Paths);
786#endif
787}
788
789void MSVCToolChain::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
790 ArgStringList &CC1Args) const {
791 // FIXME: There should probably be logic here to find libc++ on Windows.
792}
793
794VersionTuple MSVCToolChain::computeMSVCVersion(const Driver *D,
795 const ArgList &Args) const {
796 bool IsWindowsMSVC = getTriple().isWindowsMSVCEnvironment();
797 VersionTuple MSVT = ToolChain::computeMSVCVersion(D, Args);
798 if (MSVT.empty())
799 MSVT = getTriple().getEnvironmentVersion();
800 if (MSVT.empty() && IsWindowsMSVC)
801 MSVT =
802 getMSVCVersionFromExe(BinDir: getSubDirectoryPath(Type: llvm::SubDirectoryType::Bin));
803 if (MSVT.empty() &&
804 Args.hasFlag(Pos: options::OPT_fms_extensions, Neg: options::OPT_fno_ms_extensions,
805 Default: IsWindowsMSVC)) {
806 // -fms-compatibility-version=19.33 is default, aka 2022, 17.3
807 // NOTE: when changing this value, also update
808 // clang/docs/CommandGuide/clang.rst and clang/docs/UsersManual.rst
809 // accordingly.
810 MSVT = VersionTuple(19, 33);
811 }
812 return MSVT;
813}
814
815std::string
816MSVCToolChain::ComputeEffectiveClangTriple(const ArgList &Args,
817 types::ID InputType) const {
818 // The MSVC version doesn't care about the architecture, even though it
819 // may look at the triple internally.
820 VersionTuple MSVT = computeMSVCVersion(/*D=*/nullptr, Args);
821 MSVT = VersionTuple(MSVT.getMajor(), MSVT.getMinor().value_or(u: 0),
822 MSVT.getSubminor().value_or(u: 0));
823
824 // For the rest of the triple, however, a computed architecture name may
825 // be needed.
826 llvm::Triple Triple(ToolChain::ComputeEffectiveClangTriple(Args, InputType));
827 if (Triple.getEnvironment() == llvm::Triple::MSVC) {
828 StringRef ObjFmt = Triple.getEnvironmentName().split(Separator: '-').second;
829 if (ObjFmt.empty())
830 Triple.setEnvironmentName((Twine("msvc") + MSVT.getAsString()).str());
831 else
832 Triple.setEnvironmentName(
833 (Twine("msvc") + MSVT.getAsString() + Twine('-') + ObjFmt).str());
834 }
835 return Triple.getTriple();
836}
837
838SanitizerMask MSVCToolChain::getSupportedSanitizers() const {
839 SanitizerMask Res = ToolChain::getSupportedSanitizers();
840 Res |= SanitizerKind::Address;
841 Res |= SanitizerKind::PointerCompare;
842 Res |= SanitizerKind::PointerSubtract;
843 Res |= SanitizerKind::Fuzzer;
844 Res |= SanitizerKind::FuzzerNoLink;
845 Res &= ~SanitizerKind::CFIMFCall;
846 return Res;
847}
848
849static void TranslateOptArg(Arg *A, llvm::opt::DerivedArgList &DAL,
850 bool SupportsForcingFramePointer,
851 const char *ExpandChar, const OptTable &Opts) {
852 assert(A->getOption().matches(options::OPT__SLASH_O));
853
854 StringRef OptStr = A->getValue();
855 for (size_t I = 0, E = OptStr.size(); I != E; ++I) {
856 const char &OptChar = *(OptStr.data() + I);
857 switch (OptChar) {
858 default:
859 break;
860 case '1':
861 case '2':
862 case 'x':
863 case 'd':
864 // Ignore /O[12xd] flags that aren't the last one on the command line.
865 // Only the last one gets expanded.
866 if (&OptChar != ExpandChar) {
867 A->claim();
868 break;
869 }
870 if (OptChar == 'd') {
871 DAL.AddFlagArg(BaseArg: A, Opt: Opts.getOption(Opt: options::OPT_O0));
872 } else {
873 if (OptChar == '1') {
874 DAL.AddJoinedArg(BaseArg: A, Opt: Opts.getOption(Opt: options::OPT_O), Value: "s");
875 } else if (OptChar == '2' || OptChar == 'x') {
876 DAL.AddFlagArg(BaseArg: A, Opt: Opts.getOption(Opt: options::OPT_fbuiltin));
877 DAL.AddJoinedArg(BaseArg: A, Opt: Opts.getOption(Opt: options::OPT_O), Value: "3");
878 }
879 if (SupportsForcingFramePointer &&
880 !DAL.hasArgNoClaim(Ids: options::OPT_fno_omit_frame_pointer))
881 DAL.AddFlagArg(BaseArg: A, Opt: Opts.getOption(Opt: options::OPT_fomit_frame_pointer));
882 if (OptChar == '1' || OptChar == '2')
883 DAL.AddFlagArg(BaseArg: A, Opt: Opts.getOption(Opt: options::OPT_ffunction_sections));
884 }
885 break;
886 case 'b':
887 if (I + 1 != E && isdigit(OptStr[I + 1])) {
888 switch (OptStr[I + 1]) {
889 case '0':
890 DAL.AddFlagArg(BaseArg: A, Opt: Opts.getOption(Opt: options::OPT_fno_inline));
891 break;
892 case '1':
893 DAL.AddFlagArg(BaseArg: A, Opt: Opts.getOption(Opt: options::OPT_finline_hint_functions));
894 break;
895 case '2':
896 case '3':
897 DAL.AddFlagArg(BaseArg: A, Opt: Opts.getOption(Opt: options::OPT_finline_functions));
898 break;
899 }
900 ++I;
901 }
902 break;
903 case 'g':
904 A->claim();
905 break;
906 case 'i':
907 if (I + 1 != E && OptStr[I + 1] == '-') {
908 ++I;
909 DAL.AddFlagArg(BaseArg: A, Opt: Opts.getOption(Opt: options::OPT_fno_builtin));
910 } else {
911 DAL.AddFlagArg(BaseArg: A, Opt: Opts.getOption(Opt: options::OPT_fbuiltin));
912 }
913 break;
914 case 's':
915 DAL.AddJoinedArg(BaseArg: A, Opt: Opts.getOption(Opt: options::OPT_O), Value: "s");
916 break;
917 case 't':
918 DAL.AddJoinedArg(BaseArg: A, Opt: Opts.getOption(Opt: options::OPT_O), Value: "3");
919 break;
920 case 'y': {
921 bool OmitFramePointer = true;
922 if (I + 1 != E && OptStr[I + 1] == '-') {
923 OmitFramePointer = false;
924 ++I;
925 }
926 if (SupportsForcingFramePointer) {
927 if (OmitFramePointer)
928 DAL.AddFlagArg(BaseArg: A,
929 Opt: Opts.getOption(Opt: options::OPT_fomit_frame_pointer));
930 else
931 DAL.AddFlagArg(
932 BaseArg: A, Opt: Opts.getOption(Opt: options::OPT_fno_omit_frame_pointer));
933 } else {
934 // Don't warn about /Oy- in x86-64 builds (where
935 // SupportsForcingFramePointer is false). The flag having no effect
936 // there is a compiler-internal optimization, and people shouldn't have
937 // to special-case their build files for x86-64 clang-cl.
938 A->claim();
939 }
940 break;
941 }
942 }
943 }
944}
945
946static void TranslateDArg(Arg *A, llvm::opt::DerivedArgList &DAL,
947 const OptTable &Opts) {
948 assert(A->getOption().matches(options::OPT_D));
949
950 StringRef Val = A->getValue();
951 size_t Hash = Val.find(C: '#');
952 if (Hash == StringRef::npos || Hash > Val.find(C: '=')) {
953 DAL.append(A);
954 return;
955 }
956
957 std::string NewVal = std::string(Val);
958 NewVal[Hash] = '=';
959 DAL.AddJoinedArg(BaseArg: A, Opt: Opts.getOption(Opt: options::OPT_D), Value: NewVal);
960}
961
962static void TranslatePermissive(Arg *A, llvm::opt::DerivedArgList &DAL,
963 const OptTable &Opts) {
964 DAL.AddFlagArg(BaseArg: A, Opt: Opts.getOption(Opt: options::OPT__SLASH_Zc_twoPhase_));
965 DAL.AddFlagArg(BaseArg: A, Opt: Opts.getOption(Opt: options::OPT_fno_operator_names));
966}
967
968static void TranslatePermissiveMinus(Arg *A, llvm::opt::DerivedArgList &DAL,
969 const OptTable &Opts) {
970 DAL.AddFlagArg(BaseArg: A, Opt: Opts.getOption(Opt: options::OPT__SLASH_Zc_twoPhase));
971 DAL.AddFlagArg(BaseArg: A, Opt: Opts.getOption(Opt: options::OPT_foperator_names));
972}
973
974llvm::opt::DerivedArgList *
975MSVCToolChain::TranslateArgs(const llvm::opt::DerivedArgList &Args,
976 StringRef BoundArch,
977 Action::OffloadKind OFK) const {
978 DerivedArgList *DAL = new DerivedArgList(Args.getBaseArgs());
979 const OptTable &Opts = getDriver().getOpts();
980
981 // /Oy and /Oy- don't have an effect on X86-64
982 bool SupportsForcingFramePointer = getArch() != llvm::Triple::x86_64;
983
984 // The -O[12xd] flag actually expands to several flags. We must desugar the
985 // flags so that options embedded can be negated. For example, the '-O2' flag
986 // enables '-Oy'. Expanding '-O2' into its constituent flags allows us to
987 // correctly handle '-O2 -Oy-' where the trailing '-Oy-' disables a single
988 // aspect of '-O2'.
989 //
990 // Note that this expansion logic only applies to the *last* of '[12xd]'.
991
992 // First step is to search for the character we'd like to expand.
993 const char *ExpandChar = nullptr;
994 for (Arg *A : Args.filtered(Ids: options::OPT__SLASH_O)) {
995 StringRef OptStr = A->getValue();
996 for (size_t I = 0, E = OptStr.size(); I != E; ++I) {
997 char OptChar = OptStr[I];
998 char PrevChar = I > 0 ? OptStr[I - 1] : '0';
999 if (PrevChar == 'b') {
1000 // OptChar does not expand; it's an argument to the previous char.
1001 continue;
1002 }
1003 if (OptChar == '1' || OptChar == '2' || OptChar == 'x' || OptChar == 'd')
1004 ExpandChar = OptStr.data() + I;
1005 }
1006 }
1007
1008 for (Arg *A : Args) {
1009 if (A->getOption().matches(ID: options::OPT__SLASH_O)) {
1010 // The -O flag actually takes an amalgam of other options. For example,
1011 // '/Ogyb2' is equivalent to '/Og' '/Oy' '/Ob2'.
1012 TranslateOptArg(A, DAL&: *DAL, SupportsForcingFramePointer, ExpandChar, Opts);
1013 } else if (A->getOption().matches(ID: options::OPT_D)) {
1014 // Translate -Dfoo#bar into -Dfoo=bar.
1015 TranslateDArg(A, DAL&: *DAL, Opts);
1016 } else if (A->getOption().matches(ID: options::OPT__SLASH_permissive)) {
1017 // Expand /permissive
1018 TranslatePermissive(A, DAL&: *DAL, Opts);
1019 } else if (A->getOption().matches(ID: options::OPT__SLASH_permissive_)) {
1020 // Expand /permissive-
1021 TranslatePermissiveMinus(A, DAL&: *DAL, Opts);
1022 } else if (OFK != Action::OFK_HIP) {
1023 // HIP Toolchain translates input args by itself.
1024 DAL->append(A);
1025 }
1026 }
1027
1028 return DAL;
1029}
1030
1031void MSVCToolChain::addClangTargetOptions(
1032 const ArgList &DriverArgs, ArgStringList &CC1Args,
1033 Action::OffloadKind DeviceOffloadKind) const {
1034 // MSVC STL kindly allows removing all usages of typeid by defining
1035 // _HAS_STATIC_RTTI to 0. Do so, when compiling with -fno-rtti
1036 if (DriverArgs.hasFlag(Pos: options::OPT_fno_rtti, Neg: options::OPT_frtti,
1037 /*Default=*/false))
1038 CC1Args.push_back(Elt: "-D_HAS_STATIC_RTTI=0");
1039
1040 if (Arg *A = DriverArgs.getLastArgNoClaim(Ids: options::OPT_marm64x))
1041 A->ignoreTargetSpecific();
1042}
1043