1 //===--- Fuchsia.cpp - Fuchsia ToolChain Implementations --------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "Fuchsia.h"
11 #include "CommonArgs.h"
12 #include "clang/Config/config.h"
13 #include "clang/Driver/Compilation.h"
14 #include "clang/Driver/Driver.h"
15 #include "clang/Driver/DriverDiagnostic.h"
16 #include "clang/Driver/Options.h"
17 #include "clang/Driver/SanitizerArgs.h"
18 #include "llvm/Option/ArgList.h"
19 #include "llvm/Support/Path.h"
20 
21 using namespace clang::driver;
22 using namespace clang::driver::toolchains;
23 using namespace clang::driver::tools;
24 using namespace clang;
25 using namespace llvm::opt;
26 
27 void fuchsia::Linker::ConstructJob(Compilation &C, const JobAction &JA,
28                                    const InputInfo &Output,
29                                    const InputInfoList &Inputs,
30                                    const ArgList &Args,
31                                    const char *LinkingOutput) const {
32   const toolchains::Fuchsia &ToolChain =
33       static_cast<const toolchains::Fuchsia &>(getToolChain());
34   const Driver &D = ToolChain.getDriver();
35 
36   ArgStringList CmdArgs;
37 
38   // Silence warning for "clang -g foo.o -o foo"
39   Args.ClaimAllArgs(options::OPT_g_Group);
40   // and "clang -emit-llvm foo.o -o foo"
41   Args.ClaimAllArgs(options::OPT_emit_llvm);
42   // and for "clang -w foo.o -o foo". Other warning options are already
43   // handled somewhere else.
44   Args.ClaimAllArgs(options::OPT_w);
45 
46   const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
47   if (llvm::sys::path::filename(Exec).equals_lower("ld.lld") ||
48       llvm::sys::path::stem(Exec).equals_lower("ld.lld")) {
49     CmdArgs.push_back("-z");
50     CmdArgs.push_back("rodynamic");
51   }
52 
53   if (!D.SysRoot.empty())
54     CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
55 
56   if (!Args.hasArg(options::OPT_shared) && !Args.hasArg(options::OPT_r))
57     CmdArgs.push_back("-pie");
58 
59   if (Args.hasArg(options::OPT_rdynamic))
60     CmdArgs.push_back("-export-dynamic");
61 
62   if (Args.hasArg(options::OPT_s))
63     CmdArgs.push_back("-s");
64 
65   if (Args.hasArg(options::OPT_r)) {
66     CmdArgs.push_back("-r");
67   } else {
68     CmdArgs.push_back("--build-id");
69     CmdArgs.push_back("--hash-style=gnu");
70   }
71 
72   CmdArgs.push_back("--eh-frame-hdr");
73 
74   if (Args.hasArg(options::OPT_static))
75     CmdArgs.push_back("-Bstatic");
76   else if (Args.hasArg(options::OPT_shared))
77     CmdArgs.push_back("-shared");
78 
79   if (!Args.hasArg(options::OPT_shared)) {
80     std::string Dyld = D.DyldPrefix;
81     if (ToolChain.getSanitizerArgs().needsAsanRt() &&
82         ToolChain.getSanitizerArgs().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   ToolChain.AddFilePathLibArgs(Args, CmdArgs);
102 
103   if (D.isUsingLTO()) {
104     assert(!Inputs.empty() && "Must have at least one input.");
105     AddGoldPlugin(ToolChain, Args, CmdArgs, Output, Inputs[0],
106                   D.getLTOMode() == LTOK_Thin);
107   }
108 
109   addSanitizerRuntimes(ToolChain, Args, CmdArgs);
110 
111   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
112 
113   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
114     if (Args.hasArg(options::OPT_static))
115       CmdArgs.push_back("-Bdynamic");
116 
117     if (D.CCCIsCXX()) {
118       if (ToolChain.ShouldLinkCXXStdlib(Args))
119         ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
120       CmdArgs.push_back("-lm");
121     }
122 
123     AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
124 
125     if (Args.hasArg(options::OPT_pthread) ||
126         Args.hasArg(options::OPT_pthreads))
127       CmdArgs.push_back("-lpthread");
128 
129     if (Args.hasArg(options::OPT_fsplit_stack))
130       CmdArgs.push_back("--wrap=pthread_create");
131 
132     CmdArgs.push_back("-lc");
133   }
134 
135   C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
136 }
137 
138 /// Fuchsia - Fuchsia tool chain which can call as(1) and ld(1) directly.
139 
140 static std::string normalizeTriple(llvm::Triple Triple) {
141   SmallString<64> T;
142   T += Triple.getArchName();
143   T += "-";
144   T += Triple.getOSName();
145   return T.str();
146 }
147 
148 static std::string getTargetDir(const Driver &D,
149                                 llvm::Triple Triple) {
150   SmallString<128> P(llvm::sys::path::parent_path(D.Dir));
151   llvm::sys::path::append(P, "lib", normalizeTriple(Triple));
152   return P.str();
153 }
154 
155 Fuchsia::Fuchsia(const Driver &D, const llvm::Triple &Triple,
156                  const ArgList &Args)
157     : ToolChain(D, Triple, Args) {
158   getProgramPaths().push_back(getDriver().getInstalledDir());
159   if (getDriver().getInstalledDir() != D.Dir)
160     getProgramPaths().push_back(D.Dir);
161 
162   SmallString<128> P(getTargetDir(D, getTriple()));
163   llvm::sys::path::append(P, "lib");
164   getFilePaths().push_back(P.str());
165 
166   if (!D.SysRoot.empty()) {
167     SmallString<128> P(D.SysRoot);
168     llvm::sys::path::append(P, "lib");
169     getFilePaths().push_back(P.str());
170   }
171 }
172 
173 std::string Fuchsia::ComputeEffectiveClangTriple(const ArgList &Args,
174                                                  types::ID InputType) const {
175   llvm::Triple Triple(ComputeLLVMTriple(Args, InputType));
176   Triple.setTriple(normalizeTriple(Triple));
177   return Triple.getTriple();
178 }
179 
180 Tool *Fuchsia::buildLinker() const {
181   return new tools::fuchsia::Linker(*this);
182 }
183 
184 ToolChain::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 
196 ToolChain::CXXStdlibType
197 Fuchsia::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 
208 void 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 
216 void 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 
252 void 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(getTargetDir(getDriver(), getTriple()));
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 
271 void 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 
283 SanitizerMask 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 
293 SanitizerMask Fuchsia::getDefaultSanitizers() const {
294   return SanitizerKind::SafeStack;
295 }
296