clang  14.0.0git
WebAssembly.cpp
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1 //===--- WebAssembly.cpp - WebAssembly ToolChain Implementation -*- 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 "WebAssembly.h"
10 #include "CommonArgs.h"
11 #include "clang/Basic/Version.h"
12 #include "clang/Config/config.h"
14 #include "clang/Driver/Driver.h"
16 #include "clang/Driver/Options.h"
17 #include "llvm/Support/FileSystem.h"
18 #include "llvm/Support/Path.h"
19 #include "llvm/Option/ArgList.h"
20 
21 using namespace clang::driver;
22 using namespace clang::driver::tools;
23 using namespace clang::driver::toolchains;
24 using namespace clang;
25 using namespace llvm::opt;
26 
27 /// Following the conventions in https://wiki.debian.org/Multiarch/Tuples,
28 /// we remove the vendor field to form the multiarch triple.
29 std::string WebAssembly::getMultiarchTriple(const Driver &D,
30  const llvm::Triple &TargetTriple,
31  StringRef SysRoot) const {
32  return (TargetTriple.getArchName() + "-" +
33  TargetTriple.getOSAndEnvironmentName()).str();
34 }
35 
36 std::string wasm::Linker::getLinkerPath(const ArgList &Args) const {
37  const ToolChain &ToolChain = getToolChain();
38  if (const Arg* A = Args.getLastArg(options::OPT_fuse_ld_EQ)) {
39  StringRef UseLinker = A->getValue();
40  if (!UseLinker.empty()) {
41  if (llvm::sys::path::is_absolute(UseLinker) &&
42  llvm::sys::fs::can_execute(UseLinker))
43  return std::string(UseLinker);
44 
45  // Accept 'lld', and 'ld' as aliases for the default linker
46  if (UseLinker != "lld" && UseLinker != "ld")
47  ToolChain.getDriver().Diag(diag::err_drv_invalid_linker_name)
48  << A->getAsString(Args);
49  }
50  }
51 
53 }
54 
56  const InputInfo &Output,
57  const InputInfoList &Inputs,
58  const ArgList &Args,
59  const char *LinkingOutput) const {
60 
61  const ToolChain &ToolChain = getToolChain();
62  const char *Linker = Args.MakeArgString(getLinkerPath(Args));
63  ArgStringList CmdArgs;
64 
65  CmdArgs.push_back("-m");
66  if (ToolChain.getTriple().isArch64Bit())
67  CmdArgs.push_back("wasm64");
68  else
69  CmdArgs.push_back("wasm32");
70 
71  if (Args.hasArg(options::OPT_s))
72  CmdArgs.push_back("--strip-all");
73 
74  Args.AddAllArgs(CmdArgs, options::OPT_L);
75  Args.AddAllArgs(CmdArgs, options::OPT_u);
76  ToolChain.AddFilePathLibArgs(Args, CmdArgs);
77 
78  const char *Crt1 = "crt1.o";
79  const char *Entry = NULL;
80 
81  // If crt1-command.o exists, it supports new-style commands, so use it.
82  // Otherwise, use the old crt1.o. This is a temporary transition measure.
83  // Once WASI libc no longer needs to support LLVM versions which lack
84  // support for new-style command, it can make crt1.o the same as
85  // crt1-command.o. And once LLVM no longer needs to support WASI libc
86  // versions before that, it can switch to using crt1-command.o.
87  if (ToolChain.GetFilePath("crt1-command.o") != "crt1-command.o")
88  Crt1 = "crt1-command.o";
89 
90  if (const Arg *A = Args.getLastArg(options::OPT_mexec_model_EQ)) {
91  StringRef CM = A->getValue();
92  if (CM == "command") {
93  // Use default values.
94  } else if (CM == "reactor") {
95  Crt1 = "crt1-reactor.o";
96  Entry = "_initialize";
97  } else {
98  ToolChain.getDriver().Diag(diag::err_drv_invalid_argument_to_option)
99  << CM << A->getOption().getName();
100  }
101  }
102  if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles))
103  CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(Crt1)));
104  if (Entry) {
105  CmdArgs.push_back(Args.MakeArgString("--entry"));
106  CmdArgs.push_back(Args.MakeArgString(Entry));
107  }
108 
109  AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
110 
111  if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
112  if (ToolChain.ShouldLinkCXXStdlib(Args))
113  ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
114 
115  if (Args.hasArg(options::OPT_pthread)) {
116  CmdArgs.push_back("-lpthread");
117  CmdArgs.push_back("--shared-memory");
118  }
119 
120  CmdArgs.push_back("-lc");
121  AddRunTimeLibs(ToolChain, ToolChain.getDriver(), CmdArgs, Args);
122  }
123 
124  CmdArgs.push_back("-o");
125  CmdArgs.push_back(Output.getFilename());
126 
127  C.addCommand(std::make_unique<Command>(JA, *this,
129  Linker, CmdArgs, Inputs, Output));
130 
131  // When optimizing, if wasm-opt is available, run it.
132  if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
133  auto WasmOptPath = ToolChain.GetProgramPath("wasm-opt");
134  if (WasmOptPath != "wasm-opt") {
135  StringRef OOpt = "s";
136  if (A->getOption().matches(options::OPT_O4) ||
137  A->getOption().matches(options::OPT_Ofast))
138  OOpt = "4";
139  else if (A->getOption().matches(options::OPT_O0))
140  OOpt = "0";
141  else if (A->getOption().matches(options::OPT_O))
142  OOpt = A->getValue();
143 
144  if (OOpt != "0") {
145  const char *WasmOpt = Args.MakeArgString(WasmOptPath);
146  ArgStringList CmdArgs;
147  CmdArgs.push_back(Output.getFilename());
148  CmdArgs.push_back(Args.MakeArgString(llvm::Twine("-O") + OOpt));
149  CmdArgs.push_back("-o");
150  CmdArgs.push_back(Output.getFilename());
151  C.addCommand(std::make_unique<Command>(
152  JA, *this, ResponseFileSupport::AtFileCurCP(), WasmOpt, CmdArgs,
153  Inputs, Output));
154  }
155  }
156  }
157 }
158 
159 /// Given a base library directory, append path components to form the
160 /// LTO directory.
162  // The version allows the path to be keyed to the specific version of
163  // LLVM in used, as the bitcode format is not stable.
164  return Dir + "/llvm-lto/" LLVM_VERSION_STRING;
165 }
166 
167 WebAssembly::WebAssembly(const Driver &D, const llvm::Triple &Triple,
168  const llvm::opt::ArgList &Args)
169  : ToolChain(D, Triple, Args) {
170 
171  assert(Triple.isArch32Bit() != Triple.isArch64Bit());
172 
173  getProgramPaths().push_back(getDriver().getInstalledDir());
174 
175  auto SysRoot = getDriver().SysRoot;
176  if (getTriple().getOS() == llvm::Triple::UnknownOS) {
177  // Theoretically an "unknown" OS should mean no standard libraries, however
178  // it could also mean that a custom set of libraries is in use, so just add
179  // /lib to the search path. Disable multiarch in this case, to discourage
180  // paths containing "unknown" from acquiring meanings.
181  getFilePaths().push_back(SysRoot + "/lib");
182  } else {
183  const std::string MultiarchTriple =
184  getMultiarchTriple(getDriver(), Triple, SysRoot);
185  if (D.isUsingLTO()) {
186  // For LTO, enable use of lto-enabled sysroot libraries too, if available.
187  // Note that the directory is keyed to the LLVM revision, as LLVM's
188  // bitcode format is not stable.
189  auto Dir = AppendLTOLibDir(SysRoot + "/lib/" + MultiarchTriple);
190  getFilePaths().push_back(Dir);
191  }
192  getFilePaths().push_back(SysRoot + "/lib/" + MultiarchTriple);
193  }
194 }
195 
196 bool WebAssembly::IsMathErrnoDefault() const { return false; }
197 
198 bool WebAssembly::IsObjCNonFragileABIDefault() const { return true; }
199 
200 bool WebAssembly::UseObjCMixedDispatch() const { return true; }
201 
202 bool WebAssembly::isPICDefault() const { return false; }
203 
204 bool WebAssembly::isPIEDefault() const { return false; }
205 
206 bool WebAssembly::isPICDefaultForced() const { return false; }
207 
208 bool WebAssembly::IsIntegratedAssemblerDefault() const { return true; }
209 
210 bool WebAssembly::hasBlocksRuntime() const { return false; }
211 
212 // TODO: Support profiling.
213 bool WebAssembly::SupportsProfiling() const { return false; }
214 
215 bool WebAssembly::HasNativeLLVMSupport() const { return true; }
216 
217 void WebAssembly::addClangTargetOptions(const ArgList &DriverArgs,
218  ArgStringList &CC1Args,
219  Action::OffloadKind) const {
220  if (!DriverArgs.hasFlag(clang::driver::options::OPT_fuse_init_array,
221  options::OPT_fno_use_init_array, true))
222  CC1Args.push_back("-fno-use-init-array");
223 
224  // '-pthread' implies atomics, bulk-memory, mutable-globals, and sign-ext
225  if (DriverArgs.hasFlag(options::OPT_pthread, options::OPT_no_pthread,
226  false)) {
227  if (DriverArgs.hasFlag(options::OPT_mno_atomics, options::OPT_matomics,
228  false))
229  getDriver().Diag(diag::err_drv_argument_not_allowed_with)
230  << "-pthread"
231  << "-mno-atomics";
232  if (DriverArgs.hasFlag(options::OPT_mno_bulk_memory,
233  options::OPT_mbulk_memory, false))
234  getDriver().Diag(diag::err_drv_argument_not_allowed_with)
235  << "-pthread"
236  << "-mno-bulk-memory";
237  if (DriverArgs.hasFlag(options::OPT_mno_mutable_globals,
238  options::OPT_mmutable_globals, false))
239  getDriver().Diag(diag::err_drv_argument_not_allowed_with)
240  << "-pthread"
241  << "-mno-mutable-globals";
242  if (DriverArgs.hasFlag(options::OPT_mno_sign_ext, options::OPT_msign_ext,
243  false))
244  getDriver().Diag(diag::err_drv_argument_not_allowed_with)
245  << "-pthread"
246  << "-mno-sign-ext";
247  CC1Args.push_back("-target-feature");
248  CC1Args.push_back("+atomics");
249  CC1Args.push_back("-target-feature");
250  CC1Args.push_back("+bulk-memory");
251  CC1Args.push_back("-target-feature");
252  CC1Args.push_back("+mutable-globals");
253  CC1Args.push_back("-target-feature");
254  CC1Args.push_back("+sign-ext");
255  }
256 
257  if (!DriverArgs.hasFlag(options::OPT_mmutable_globals,
258  options::OPT_mno_mutable_globals, false)) {
259  // -fPIC implies +mutable-globals because the PIC ABI used by the linker
260  // depends on importing and exporting mutable globals.
261  llvm::Reloc::Model RelocationModel;
262  unsigned PICLevel;
263  bool IsPIE;
264  std::tie(RelocationModel, PICLevel, IsPIE) =
265  ParsePICArgs(*this, DriverArgs);
266  if (RelocationModel == llvm::Reloc::PIC_) {
267  if (DriverArgs.hasFlag(options::OPT_mno_mutable_globals,
268  options::OPT_mmutable_globals, false)) {
269  getDriver().Diag(diag::err_drv_argument_not_allowed_with)
270  << "-fPIC"
271  << "-mno-mutable-globals";
272  }
273  CC1Args.push_back("-target-feature");
274  CC1Args.push_back("+mutable-globals");
275  }
276  }
277 
278  if (DriverArgs.getLastArg(options::OPT_fwasm_exceptions)) {
279  // '-fwasm-exceptions' is not compatible with '-mno-exception-handling'
280  if (DriverArgs.hasFlag(options::OPT_mno_exception_handing,
281  options::OPT_mexception_handing, false))
282  getDriver().Diag(diag::err_drv_argument_not_allowed_with)
283  << "-fwasm-exceptions"
284  << "-mno-exception-handling";
285  // '-fwasm-exceptions' is not compatible with
286  // '-mllvm -enable-emscripten-cxx-exceptions'
287  for (const Arg *A : DriverArgs.filtered(options::OPT_mllvm)) {
288  if (StringRef(A->getValue(0)) == "-enable-emscripten-cxx-exceptions")
289  getDriver().Diag(diag::err_drv_argument_not_allowed_with)
290  << "-fwasm-exceptions"
291  << "-mllvm -enable-emscripten-cxx-exceptions";
292  }
293  // '-fwasm-exceptions' implies exception-handling feature
294  CC1Args.push_back("-target-feature");
295  CC1Args.push_back("+exception-handling");
296  // Backend needs -wasm-enable-eh to enable Wasm EH
297  CC1Args.push_back("-mllvm");
298  CC1Args.push_back("-wasm-enable-eh");
299  }
300 
301  for (const Arg *A : DriverArgs.filtered(options::OPT_mllvm)) {
302  StringRef Opt = A->getValue(0);
303  if (Opt.startswith("-emscripten-cxx-exceptions-allowed")) {
304  // '-mllvm -emscripten-cxx-exceptions-allowed' should be used with
305  // '-mllvm -enable-emscripten-cxx-exceptions'
306  bool EmEHArgExists = false;
307  for (const Arg *A : DriverArgs.filtered(options::OPT_mllvm)) {
308  if (StringRef(A->getValue(0)) == "-enable-emscripten-cxx-exceptions") {
309  EmEHArgExists = true;
310  break;
311  }
312  }
313  if (!EmEHArgExists)
314  getDriver().Diag(diag::err_drv_argument_only_allowed_with)
315  << "-mllvm -emscripten-cxx-exceptions-allowed"
316  << "-mllvm -enable-emscripten-cxx-exceptions";
317 
318  // Prevent functions specified in -emscripten-cxx-exceptions-allowed list
319  // from being inlined before reaching the wasm backend.
320  StringRef FuncNamesStr = Opt.split('=').second;
321  SmallVector<StringRef, 4> FuncNames;
322  FuncNamesStr.split(FuncNames, ',');
323  for (auto Name : FuncNames) {
324  CC1Args.push_back("-mllvm");
325  CC1Args.push_back(DriverArgs.MakeArgString("--force-attribute=" + Name +
326  ":noinline"));
327  }
328  }
329 
330  if (Opt.startswith("-wasm-enable-sjlj")) {
331  // '-mllvm -wasm-enable-sjlj' is not compatible with
332  // '-mno-exception-handling'
333  if (DriverArgs.hasFlag(options::OPT_mno_exception_handing,
334  options::OPT_mexception_handing, false))
335  getDriver().Diag(diag::err_drv_argument_not_allowed_with)
336  << "-mllvm -wasm-enable-sjlj"
337  << "-mno-exception-handling";
338  // '-mllvm -wasm-enable-sjlj' is not compatible with
339  // '-mllvm -enable-emscripten-cxx-exceptions'
340  // because we don't allow Emscripten EH + Wasm SjLj
341  for (const Arg *A : DriverArgs.filtered(options::OPT_mllvm)) {
342  if (StringRef(A->getValue(0)) == "-enable-emscripten-cxx-exceptions")
343  getDriver().Diag(diag::err_drv_argument_not_allowed_with)
344  << "-mllvm -wasm-enable-sjlj"
345  << "-mllvm -enable-emscripten-cxx-exceptions";
346  }
347  // '-mllvm -wasm-enable-sjlj' is not compatible with
348  // '-mllvm -enable-emscripten-sjlj'
349  for (const Arg *A : DriverArgs.filtered(options::OPT_mllvm)) {
350  if (StringRef(A->getValue(0)) == "-enable-emscripten-sjlj")
351  getDriver().Diag(diag::err_drv_argument_not_allowed_with)
352  << "-mllvm -wasm-enable-sjlj"
353  << "-mllvm -enable-emscripten-sjlj";
354  }
355  // '-mllvm -wasm-enable-sjlj' implies exception-handling feature
356  CC1Args.push_back("-target-feature");
357  CC1Args.push_back("+exception-handling");
358  // Backend needs '-exception-model=wasm' to use Wasm EH instructions
359  CC1Args.push_back("-exception-model=wasm");
360  }
361  }
362 }
363 
364 ToolChain::RuntimeLibType WebAssembly::GetDefaultRuntimeLibType() const {
366 }
367 
369 WebAssembly::GetCXXStdlibType(const ArgList &Args) const {
370  if (Arg *A = Args.getLastArg(options::OPT_stdlib_EQ)) {
371  StringRef Value = A->getValue();
372  if (Value != "libc++")
373  getDriver().Diag(diag::err_drv_invalid_stdlib_name)
374  << A->getAsString(Args);
375  }
376  return ToolChain::CST_Libcxx;
377 }
378 
379 void WebAssembly::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
380  ArgStringList &CC1Args) const {
381  if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc))
382  return;
383 
384  const Driver &D = getDriver();
385 
386  if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
388  llvm::sys::path::append(P, "include");
389  addSystemInclude(DriverArgs, CC1Args, P);
390  }
391 
392  if (DriverArgs.hasArg(options::OPT_nostdlibinc))
393  return;
394 
395  // Check for configure-time C include directories.
396  StringRef CIncludeDirs(C_INCLUDE_DIRS);
397  if (CIncludeDirs != "") {
399  CIncludeDirs.split(dirs, ":");
400  for (StringRef dir : dirs) {
401  StringRef Prefix =
402  llvm::sys::path::is_absolute(dir) ? "" : StringRef(D.SysRoot);
403  addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir);
404  }
405  return;
406  }
407 
408  if (getTriple().getOS() != llvm::Triple::UnknownOS) {
409  const std::string MultiarchTriple =
410  getMultiarchTriple(D, getTriple(), D.SysRoot);
411  addSystemInclude(DriverArgs, CC1Args, D.SysRoot + "/include/" + MultiarchTriple);
412  }
413  addSystemInclude(DriverArgs, CC1Args, D.SysRoot + "/include");
414 }
415 
416 void WebAssembly::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
417  ArgStringList &CC1Args) const {
418  if (!DriverArgs.hasArg(options::OPT_nostdlibinc) &&
419  !DriverArgs.hasArg(options::OPT_nostdincxx)) {
420  if (getTriple().getOS() != llvm::Triple::UnknownOS) {
421  const std::string MultiarchTriple =
422  getMultiarchTriple(getDriver(), getTriple(), getDriver().SysRoot);
423  addSystemInclude(DriverArgs, CC1Args,
424  getDriver().SysRoot + "/include/" + MultiarchTriple +
425  "/c++/v1");
426  }
427  addSystemInclude(DriverArgs, CC1Args,
428  getDriver().SysRoot + "/include/c++/v1");
429  }
430 }
431 
432 void WebAssembly::AddCXXStdlibLibArgs(const llvm::opt::ArgList &Args,
433  llvm::opt::ArgStringList &CmdArgs) const {
434 
435  switch (GetCXXStdlibType(Args)) {
437  CmdArgs.push_back("-lc++");
438  CmdArgs.push_back("-lc++abi");
439  break;
441  llvm_unreachable("invalid stdlib name");
442  }
443 }
444 
445 SanitizerMask WebAssembly::getSupportedSanitizers() const {
447  if (getTriple().isOSEmscripten()) {
448  Res |= SanitizerKind::Vptr | SanitizerKind::Leak | SanitizerKind::Address;
449  }
450  return Res;
451 }
452 
453 Tool *WebAssembly::buildLinker() const {
454  return new tools::wasm::Linker(*this);
455 }
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Definition: WebAssembly.h:21
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Definition: Tool.h:32
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Definition: ToolChain.h:223
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std::string SysRoot
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Definition: Driver.h:151
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@ CST_Libcxx
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Definition: ToolChain.h:97
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std::string ResourceDir
The path to the compiler resource directory.
Definition: Driver.h:135
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AddFilePathLibArgs - Add each thing in getFilePaths() as a "-L" option.
Definition: ToolChain.cpp:955
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bool ShouldLinkCXXStdlib(const llvm::opt::ArgList &Args) const
Returns if the C++ standard library should be linked in.
Definition: ToolChain.cpp:932
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void ConstructJob(Compilation &C, const JobAction &JA, const InputInfo &Output, const InputInfoList &Inputs, const llvm::opt::ArgList &TCArgs, const char *LinkingOutput) const override
ConstructJob - Construct jobs to perform the action JA, writing to Output and with Inputs,...
Definition: WebAssembly.cpp:55
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virtual SanitizerMask getSupportedSanitizers() const
Return sanitizers which are available in this toolchain.
Definition: ToolChain.cpp:998
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bool isUsingLTO(bool IsOffload=false) const
Returns true if we are performing any kind of LTO.
Definition: Driver.h:559
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virtual void AddCXXStdlibLibArgs(const llvm::opt::ArgList &Args, llvm::opt::ArgStringList &CmdArgs) const
AddCXXStdlibLibArgs - Add the system specific linker arguments to use for the given C++ standard libr...
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ToolChain - Access to tools for a single platform.
Definition: ToolChain.h:91
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@ RLT_CompilerRT
Definition: ToolChain.h:101
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Definition: UninitializedValues.cpp:102
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void AddRunTimeLibs(const ToolChain &TC, const Driver &D, llvm::opt::ArgStringList &CmdArgs, const llvm::opt::ArgList &Args)
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Compilation - A set of tasks to perform for a single driver invocation.
Definition: Compilation.h:45
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const char * getFilename() const
Definition: InputInfo.h:83
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Definition: CalledOnceCheck.h:17
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static std::string AppendLTOLibDir(const std::string &Dir)
Given a base library directory, append path components to form the LTO directory.
Definition: WebAssembly.cpp:161
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Definition: Driver.h:59
clang::driver::ToolChain::addExternCSystemInclude
static void addExternCSystemInclude(const llvm::opt::ArgList &DriverArgs, llvm::opt::ArgStringList &CC1Args, const Twine &Path)
Utility function to add a system include directory with extern "C" semantics to CC1 arguments.
Definition: ToolChain.cpp:860
clang::driver::Action::OffloadKind
OffloadKind
Definition: Action.h:85
clang::driver
Definition: Action.h:31
clang::driver::ToolChain::addSystemInclude
static void addSystemInclude(const llvm::opt::ArgList &DriverArgs, llvm::opt::ArgStringList &CC1Args, const Twine &Path)
Utility function to add a system include directory to CC1 arguments.
Definition: ToolChain.cpp:845
clang::driver::tools::wasm::Linker::getLinkerPath
std::string getLinkerPath(const llvm::opt::ArgList &Args) const
Definition: WebAssembly.cpp:36
clang::driver::JobAction
Definition: Action.h:380
clang::SanitizerMask
Definition: Sanitizers.h:30