Clang Project

clang_source_code/lib/Driver/ToolChains/Fuchsia.cpp
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/Options.h"
16#include "clang/Driver/SanitizerArgs.h"
17#include "llvm/Option/ArgList.h"
18#include "llvm/Support/Path.h"
19
20using namespace clang::driver;
21using namespace clang::driver::toolchains;
22using namespace clang::driver::tools;
23using namespace clang;
24using namespace llvm::opt;
25
26void fuchsia::Linker::ConstructJob(Compilation &C, const JobAction &JA,
27                                   const InputInfo &Output,
28                                   const InputInfoList &Inputs,
29                                   const ArgList &Args,
30                                   const char *LinkingOutput) const {
31  const toolchains::Fuchsia &ToolChain =
32      static_cast<const toolchains::Fuchsia &>(getToolChain());
33  const Driver &D = ToolChain.getDriver();
34
35  ArgStringList CmdArgs;
36
37  // Silence warning for "clang -g foo.o -o foo"
38  Args.ClaimAllArgs(options::OPT_g_Group);
39  // and "clang -emit-llvm foo.o -o foo"
40  Args.ClaimAllArgs(options::OPT_emit_llvm);
41  // and for "clang -w foo.o -o foo". Other warning options are already
42  // handled somewhere else.
43  Args.ClaimAllArgs(options::OPT_w);
44
45  const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
46  if (llvm::sys::path::filename(Exec).equals_lower("ld.lld") ||
47      llvm::sys::path::stem(Exec).equals_lower("ld.lld")) {
48    CmdArgs.push_back("-z");
49    CmdArgs.push_back("rodynamic");
50  }
51
52  if (!D.SysRoot.empty())
53    CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
54
55  if (!Args.hasArg(options::OPT_shared) && !Args.hasArg(options::OPT_r))
56    CmdArgs.push_back("-pie");
57
58  if (Args.hasArg(options::OPT_rdynamic))
59    CmdArgs.push_back("-export-dynamic");
60
61  if (Args.hasArg(options::OPT_s))
62    CmdArgs.push_back("-s");
63
64  if (Args.hasArg(options::OPT_r)) {
65    CmdArgs.push_back("-r");
66  } else {
67    CmdArgs.push_back("--build-id");
68    CmdArgs.push_back("--hash-style=gnu");
69  }
70
71  CmdArgs.push_back("--eh-frame-hdr");
72
73  if (Args.hasArg(options::OPT_static))
74    CmdArgs.push_back("-Bstatic");
75  else if (Args.hasArg(options::OPT_shared))
76    CmdArgs.push_back("-shared");
77
78  const SanitizerArgs &SanArgs = ToolChain.getSanitizerArgs();
79
80  if (!Args.hasArg(options::OPT_shared)) {
81    std::string Dyld = D.DyldPrefix;
82    if (SanArgs.needsAsanRt() && SanArgs.needsSharedRt())
83      Dyld += "asan/";
84    Dyld += "ld.so.1";
85    CmdArgs.push_back("-dynamic-linker");
86    CmdArgs.push_back(Args.MakeArgString(Dyld));
87  }
88
89  CmdArgs.push_back("-o");
90  CmdArgs.push_back(Output.getFilename());
91
92  if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
93    if (!Args.hasArg(options::OPT_shared)) {
94      CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("Scrt1.o")));
95    }
96  }
97
98  Args.AddAllArgs(CmdArgs, options::OPT_L);
99  Args.AddAllArgs(CmdArgs, options::OPT_u);
100
101  addSanitizerPathLibArgs(ToolChain, Args, CmdArgs);
102
103  ToolChain.AddFilePathLibArgs(Args, CmdArgs);
104
105  if (D.isUsingLTO()) {
106     (0) . __assert_fail ("!Inputs.empty() && \"Must have at least one input.\"", "/home/seafit/code_projects/clang_source/clang/lib/Driver/ToolChains/Fuchsia.cpp", 106, __PRETTY_FUNCTION__))" file_link="../../../../include/assert.h.html#88" macro="true">assert(!Inputs.empty() && "Must have at least one input.");
107    AddGoldPlugin(ToolChain, Args, CmdArgs, Output, Inputs[0],
108                  D.getLTOMode() == LTOK_Thin);
109  }
110
111  bool NeedsSanitizerDeps = addSanitizerRuntimes(ToolChain, Args, CmdArgs);
112  bool NeedsXRayDeps = addXRayRuntime(ToolChain, Args, CmdArgs);
113  AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
114  ToolChain.addProfileRTLibs(Args, CmdArgs);
115
116  if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
117    if (Args.hasArg(options::OPT_static))
118      CmdArgs.push_back("-Bdynamic");
119
120    if (D.CCCIsCXX()) {
121      if (ToolChain.ShouldLinkCXXStdlib(Args)) {
122        bool OnlyLibstdcxxStatic = Args.hasArg(options::OPT_static_libstdcxx) &&
123                                   !Args.hasArg(options::OPT_static);
124        CmdArgs.push_back("--push-state");
125        CmdArgs.push_back("--as-needed");
126        if (OnlyLibstdcxxStatic)
127          CmdArgs.push_back("-Bstatic");
128        ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
129        if (OnlyLibstdcxxStatic)
130          CmdArgs.push_back("-Bdynamic");
131        CmdArgs.push_back("-lm");
132        CmdArgs.push_back("--pop-state");
133      }
134    }
135
136    if (NeedsSanitizerDeps)
137      linkSanitizerRuntimeDeps(ToolChain, CmdArgs);
138
139    if (NeedsXRayDeps)
140      linkXRayRuntimeDeps(ToolChain, CmdArgs);
141
142    AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
143
144    if (Args.hasArg(options::OPT_pthread) ||
145        Args.hasArg(options::OPT_pthreads))
146      CmdArgs.push_back("-lpthread");
147
148    if (Args.hasArg(options::OPT_fsplit_stack))
149      CmdArgs.push_back("--wrap=pthread_create");
150
151    if (!Args.hasArg(options::OPT_nolibc))
152      CmdArgs.push_back("-lc");
153  }
154
155  C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
156}
157
158/// Fuchsia - Fuchsia tool chain which can call as(1) and ld(1) directly.
159
160Fuchsia::Fuchsia(const Driver &D, const llvm::Triple &Triple,
161                 const ArgList &Args)
162    : ToolChain(D, Triple, Args) {
163  getProgramPaths().push_back(getDriver().getInstalledDir());
164  if (getDriver().getInstalledDir() != D.Dir)
165    getProgramPaths().push_back(D.Dir);
166
167  if (!D.SysRoot.empty()) {
168    SmallString<128> P(D.SysRoot);
169    llvm::sys::path::append(P, "lib");
170    getFilePaths().push_back(P.str());
171  }
172}
173
174std::string Fuchsia::ComputeEffectiveClangTriple(const ArgList &Args,
175                                                 types::ID InputType) const {
176  llvm::Triple Triple(ComputeLLVMTriple(Args, InputType));
177  return (Triple.getArchName() + "-" + Triple.getOSName()).str();
178}
179
180Tool *Fuchsia::buildLinker() const {
181  return new tools::fuchsia::Linker(*this);
182}
183
184ToolChain::RuntimeLibType Fuchsia::GetRuntimeLibType(
185    const ArgList &Args) const {
186  if (Arg *A = Args.getLastArg(clang::driver::options::OPT_rtlib_EQ)) {
187    StringRef Value = A->getValue();
188    if (Value != "compiler-rt")
189      getDriver().Diag(clang::diag::err_drv_invalid_rtlib_name)
190          << A->getAsString(Args);
191  }
192
193  return ToolChain::RLT_CompilerRT;
194}
195
196ToolChain::CXXStdlibType
197Fuchsia::GetCXXStdlibType(const ArgList &Args) const {
198  if (Arg *A = Args.getLastArg(options::OPT_stdlib_EQ)) {
199    StringRef Value = A->getValue();
200    if (Value != "libc++")
201      getDriver().Diag(diag::err_drv_invalid_stdlib_name)
202        << A->getAsString(Args);
203  }
204
205  return ToolChain::CST_Libcxx;
206}
207
208void Fuchsia::addClangTargetOptions(const ArgList &DriverArgs,
209                                    ArgStringList &CC1Args,
210                                    Action::OffloadKind) const {
211  if (DriverArgs.hasFlag(options::OPT_fuse_init_array,
212                         options::OPT_fno_use_init_array, true))
213    CC1Args.push_back("-fuse-init-array");
214}
215
216void Fuchsia::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
217                                        ArgStringList &CC1Args) const {
218  const Driver &D = getDriver();
219
220  if (DriverArgs.hasArg(options::OPT_nostdinc))
221    return;
222
223  if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
224    SmallString<128> P(D.ResourceDir);
225    llvm::sys::path::append(P, "include");
226    addSystemInclude(DriverArgs, CC1Args, P);
227  }
228
229  if (DriverArgs.hasArg(options::OPT_nostdlibinc))
230    return;
231
232  // Check for configure-time C include directories.
233  StringRef CIncludeDirs(C_INCLUDE_DIRS);
234  if (CIncludeDirs != "") {
235    SmallVector<StringRef, 5> dirs;
236    CIncludeDirs.split(dirs, ":");
237    for (StringRef dir : dirs) {
238      StringRef Prefix =
239          llvm::sys::path::is_absolute(dir) ? StringRef(D.SysRoot) : "";
240      addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir);
241    }
242    return;
243  }
244
245  if (!D.SysRoot.empty()) {
246    SmallString<128> P(D.SysRoot);
247    llvm::sys::path::append(P, "include");
248    addExternCSystemInclude(DriverArgs, CC1Args, P.str());
249  }
250}
251
252void Fuchsia::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
253                                           ArgStringList &CC1Args) const {
254  if (DriverArgs.hasArg(options::OPT_nostdlibinc) ||
255      DriverArgs.hasArg(options::OPT_nostdincxx))
256    return;
257
258  switch (GetCXXStdlibType(DriverArgs)) {
259  case ToolChain::CST_Libcxx: {
260    SmallString<128> P(getDriver().ResourceDir);
261    llvm::sys::path::append(P, "include", "c++", "v1");
262    addSystemInclude(DriverArgs, CC1Args, P.str());
263    break;
264  }
265
266  default:
267    llvm_unreachable("invalid stdlib name");
268  }
269}
270
271void Fuchsia::AddCXXStdlibLibArgs(const ArgList &Args,
272                                  ArgStringList &CmdArgs) const {
273  switch (GetCXXStdlibType(Args)) {
274  case ToolChain::CST_Libcxx:
275    CmdArgs.push_back("-lc++");
276    break;
277
278  case ToolChain::CST_Libstdcxx:
279    llvm_unreachable("invalid stdlib name");
280  }
281}
282
283SanitizerMask Fuchsia::getSupportedSanitizers() const {
284  SanitizerMask Res = ToolChain::getSupportedSanitizers();
285  Res |= SanitizerKind::Address;
286  Res |= SanitizerKind::Fuzzer;
287  Res |= SanitizerKind::FuzzerNoLink;
288  Res |= SanitizerKind::SafeStack;
289  Res |= SanitizerKind::Scudo;
290  return Res;
291}
292
293SanitizerMask Fuchsia::getDefaultSanitizers() const {
294  return SanitizerKind::SafeStack;
295}
296
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