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   const SanitizerArgs &SanArgs = ToolChain.getSanitizerArgs();
80 
81   if (!Args.hasArg(options::OPT_shared)) {
82     std::string Dyld = D.DyldPrefix;
83     if (SanArgs.needsAsanRt() && SanArgs.needsSharedRt())
84       Dyld += "asan/";
85     Dyld += "ld.so.1";
86     CmdArgs.push_back("-dynamic-linker");
87     CmdArgs.push_back(Args.MakeArgString(Dyld));
88   }
89 
90   CmdArgs.push_back("-o");
91   CmdArgs.push_back(Output.getFilename());
92 
93   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
94     if (!Args.hasArg(options::OPT_shared)) {
95       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("Scrt1.o")));
96     }
97   }
98 
99   Args.AddAllArgs(CmdArgs, options::OPT_L);
100   Args.AddAllArgs(CmdArgs, options::OPT_u);
101 
102   addSanitizerPathLibArgs(ToolChain, Args, CmdArgs);
103 
104   ToolChain.AddFilePathLibArgs(Args, CmdArgs);
105 
106   if (D.isUsingLTO()) {
107     assert(!Inputs.empty() && "Must have at least one input.");
108     AddGoldPlugin(ToolChain, Args, CmdArgs, Output, Inputs[0],
109                   D.getLTOMode() == LTOK_Thin);
110   }
111 
112   addSanitizerRuntimes(ToolChain, Args, CmdArgs);
113 
114   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
115   ToolChain.addProfileRTLibs(Args, CmdArgs);
116 
117   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
118     if (Args.hasArg(options::OPT_static))
119       CmdArgs.push_back("-Bdynamic");
120 
121     if (D.CCCIsCXX()) {
122       if (ToolChain.ShouldLinkCXXStdlib(Args)) {
123         bool OnlyLibstdcxxStatic = Args.hasArg(options::OPT_static_libstdcxx) &&
124                                    !Args.hasArg(options::OPT_static);
125         CmdArgs.push_back("--push-state");
126         CmdArgs.push_back("--as-needed");
127         if (OnlyLibstdcxxStatic)
128           CmdArgs.push_back("-Bstatic");
129         ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
130         if (OnlyLibstdcxxStatic)
131           CmdArgs.push_back("-Bdynamic");
132         CmdArgs.push_back("-lm");
133         CmdArgs.push_back("--pop-state");
134       }
135     }
136 
137     AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
138 
139     if (Args.hasArg(options::OPT_pthread) ||
140         Args.hasArg(options::OPT_pthreads))
141       CmdArgs.push_back("-lpthread");
142 
143     if (Args.hasArg(options::OPT_fsplit_stack))
144       CmdArgs.push_back("--wrap=pthread_create");
145 
146     CmdArgs.push_back("-lc");
147   }
148 
149   C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
150 }
151 
152 /// Fuchsia - Fuchsia tool chain which can call as(1) and ld(1) directly.
153 
154 Fuchsia::Fuchsia(const Driver &D, const llvm::Triple &Triple,
155                  const ArgList &Args)
156     : ToolChain(D, Triple, Args) {
157   getProgramPaths().push_back(getDriver().getInstalledDir());
158   if (getDriver().getInstalledDir() != D.Dir)
159     getProgramPaths().push_back(D.Dir);
160 
161   if (!D.SysRoot.empty()) {
162     SmallString<128> P(D.SysRoot);
163     llvm::sys::path::append(P, "lib");
164     getFilePaths().push_back(P.str());
165   }
166 }
167 
168 std::string Fuchsia::ComputeEffectiveClangTriple(const ArgList &Args,
169                                                  types::ID InputType) const {
170   llvm::Triple Triple(ComputeLLVMTriple(Args, InputType));
171   return (Triple.getArchName() + "-" + Triple.getOSName()).str();
172 }
173 
174 Tool *Fuchsia::buildLinker() const {
175   return new tools::fuchsia::Linker(*this);
176 }
177 
178 ToolChain::RuntimeLibType Fuchsia::GetRuntimeLibType(
179     const ArgList &Args) const {
180   if (Arg *A = Args.getLastArg(clang::driver::options::OPT_rtlib_EQ)) {
181     StringRef Value = A->getValue();
182     if (Value != "compiler-rt")
183       getDriver().Diag(clang::diag::err_drv_invalid_rtlib_name)
184           << A->getAsString(Args);
185   }
186 
187   return ToolChain::RLT_CompilerRT;
188 }
189 
190 ToolChain::CXXStdlibType
191 Fuchsia::GetCXXStdlibType(const ArgList &Args) const {
192   if (Arg *A = Args.getLastArg(options::OPT_stdlib_EQ)) {
193     StringRef Value = A->getValue();
194     if (Value != "libc++")
195       getDriver().Diag(diag::err_drv_invalid_stdlib_name)
196         << A->getAsString(Args);
197   }
198 
199   return ToolChain::CST_Libcxx;
200 }
201 
202 void Fuchsia::addClangTargetOptions(const ArgList &DriverArgs,
203                                     ArgStringList &CC1Args,
204                                     Action::OffloadKind) const {
205   if (DriverArgs.hasFlag(options::OPT_fuse_init_array,
206                          options::OPT_fno_use_init_array, true))
207     CC1Args.push_back("-fuse-init-array");
208 }
209 
210 void Fuchsia::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
211                                         ArgStringList &CC1Args) const {
212   const Driver &D = getDriver();
213 
214   if (DriverArgs.hasArg(options::OPT_nostdinc))
215     return;
216 
217   if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
218     SmallString<128> P(D.ResourceDir);
219     llvm::sys::path::append(P, "include");
220     addSystemInclude(DriverArgs, CC1Args, P);
221   }
222 
223   if (DriverArgs.hasArg(options::OPT_nostdlibinc))
224     return;
225 
226   // Check for configure-time C include directories.
227   StringRef CIncludeDirs(C_INCLUDE_DIRS);
228   if (CIncludeDirs != "") {
229     SmallVector<StringRef, 5> dirs;
230     CIncludeDirs.split(dirs, ":");
231     for (StringRef dir : dirs) {
232       StringRef Prefix =
233           llvm::sys::path::is_absolute(dir) ? StringRef(D.SysRoot) : "";
234       addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir);
235     }
236     return;
237   }
238 
239   if (!D.SysRoot.empty()) {
240     SmallString<128> P(D.SysRoot);
241     llvm::sys::path::append(P, "include");
242     addExternCSystemInclude(DriverArgs, CC1Args, P.str());
243   }
244 }
245 
246 void Fuchsia::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
247                                            ArgStringList &CC1Args) const {
248   if (DriverArgs.hasArg(options::OPT_nostdlibinc) ||
249       DriverArgs.hasArg(options::OPT_nostdincxx))
250     return;
251 
252   switch (GetCXXStdlibType(DriverArgs)) {
253   case ToolChain::CST_Libcxx: {
254     SmallString<128> P(getDriver().ResourceDir);
255     llvm::sys::path::append(P, "include", "c++", "v1");
256     addSystemInclude(DriverArgs, CC1Args, P.str());
257     break;
258   }
259 
260   default:
261     llvm_unreachable("invalid stdlib name");
262   }
263 }
264 
265 void Fuchsia::AddCXXStdlibLibArgs(const ArgList &Args,
266                                   ArgStringList &CmdArgs) const {
267   switch (GetCXXStdlibType(Args)) {
268   case ToolChain::CST_Libcxx:
269     CmdArgs.push_back("-lc++");
270     break;
271 
272   case ToolChain::CST_Libstdcxx:
273     llvm_unreachable("invalid stdlib name");
274   }
275 }
276 
277 SanitizerMask Fuchsia::getSupportedSanitizers() const {
278   SanitizerMask Res = ToolChain::getSupportedSanitizers();
279   Res |= SanitizerKind::Address;
280   Res |= SanitizerKind::Fuzzer;
281   Res |= SanitizerKind::FuzzerNoLink;
282   Res |= SanitizerKind::SafeStack;
283   Res |= SanitizerKind::Scudo;
284   return Res;
285 }
286 
287 SanitizerMask Fuchsia::getDefaultSanitizers() const {
288   return SanitizerKind::SafeStack;
289 }
290