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         if (OnlyLibstdcxxStatic)
126           CmdArgs.push_back("-Bstatic");
127         ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
128         if (OnlyLibstdcxxStatic)
129           CmdArgs.push_back("-Bdynamic");
130       }
131       CmdArgs.push_back("-lm");
132     }
133 
134     AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
135 
136     if (Args.hasArg(options::OPT_pthread) ||
137         Args.hasArg(options::OPT_pthreads))
138       CmdArgs.push_back("-lpthread");
139 
140     if (Args.hasArg(options::OPT_fsplit_stack))
141       CmdArgs.push_back("--wrap=pthread_create");
142 
143     CmdArgs.push_back("-lc");
144   }
145 
146   C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
147 }
148 
149 /// Fuchsia - Fuchsia tool chain which can call as(1) and ld(1) directly.
150 
151 Fuchsia::Fuchsia(const Driver &D, const llvm::Triple &Triple,
152                  const ArgList &Args)
153     : ToolChain(D, Triple, Args) {
154   getProgramPaths().push_back(getDriver().getInstalledDir());
155   if (getDriver().getInstalledDir() != D.Dir)
156     getProgramPaths().push_back(D.Dir);
157 
158   if (!D.SysRoot.empty()) {
159     SmallString<128> P(D.SysRoot);
160     llvm::sys::path::append(P, "lib");
161     getFilePaths().push_back(P.str());
162   }
163 }
164 
165 std::string Fuchsia::ComputeEffectiveClangTriple(const ArgList &Args,
166                                                  types::ID InputType) const {
167   llvm::Triple Triple(ComputeLLVMTriple(Args, InputType));
168   return (Triple.getArchName() + "-" + Triple.getOSName()).str();
169 }
170 
171 Tool *Fuchsia::buildLinker() const {
172   return new tools::fuchsia::Linker(*this);
173 }
174 
175 ToolChain::RuntimeLibType Fuchsia::GetRuntimeLibType(
176     const ArgList &Args) const {
177   if (Arg *A = Args.getLastArg(clang::driver::options::OPT_rtlib_EQ)) {
178     StringRef Value = A->getValue();
179     if (Value != "compiler-rt")
180       getDriver().Diag(clang::diag::err_drv_invalid_rtlib_name)
181           << A->getAsString(Args);
182   }
183 
184   return ToolChain::RLT_CompilerRT;
185 }
186 
187 ToolChain::CXXStdlibType
188 Fuchsia::GetCXXStdlibType(const ArgList &Args) const {
189   if (Arg *A = Args.getLastArg(options::OPT_stdlib_EQ)) {
190     StringRef Value = A->getValue();
191     if (Value != "libc++")
192       getDriver().Diag(diag::err_drv_invalid_stdlib_name)
193         << A->getAsString(Args);
194   }
195 
196   return ToolChain::CST_Libcxx;
197 }
198 
199 void Fuchsia::addClangTargetOptions(const ArgList &DriverArgs,
200                                     ArgStringList &CC1Args,
201                                     Action::OffloadKind) const {
202   if (DriverArgs.hasFlag(options::OPT_fuse_init_array,
203                          options::OPT_fno_use_init_array, true))
204     CC1Args.push_back("-fuse-init-array");
205 }
206 
207 void Fuchsia::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
208                                         ArgStringList &CC1Args) const {
209   const Driver &D = getDriver();
210 
211   if (DriverArgs.hasArg(options::OPT_nostdinc))
212     return;
213 
214   if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
215     SmallString<128> P(D.ResourceDir);
216     llvm::sys::path::append(P, "include");
217     addSystemInclude(DriverArgs, CC1Args, P);
218   }
219 
220   if (DriverArgs.hasArg(options::OPT_nostdlibinc))
221     return;
222 
223   // Check for configure-time C include directories.
224   StringRef CIncludeDirs(C_INCLUDE_DIRS);
225   if (CIncludeDirs != "") {
226     SmallVector<StringRef, 5> dirs;
227     CIncludeDirs.split(dirs, ":");
228     for (StringRef dir : dirs) {
229       StringRef Prefix =
230           llvm::sys::path::is_absolute(dir) ? StringRef(D.SysRoot) : "";
231       addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir);
232     }
233     return;
234   }
235 
236   if (!D.SysRoot.empty()) {
237     SmallString<128> P(D.SysRoot);
238     llvm::sys::path::append(P, "include");
239     addExternCSystemInclude(DriverArgs, CC1Args, P.str());
240   }
241 }
242 
243 void Fuchsia::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
244                                            ArgStringList &CC1Args) const {
245   if (DriverArgs.hasArg(options::OPT_nostdlibinc) ||
246       DriverArgs.hasArg(options::OPT_nostdincxx))
247     return;
248 
249   switch (GetCXXStdlibType(DriverArgs)) {
250   case ToolChain::CST_Libcxx: {
251     SmallString<128> P(getDriver().ResourceDir);
252     llvm::sys::path::append(P, "include", "c++", "v1");
253     addSystemInclude(DriverArgs, CC1Args, P.str());
254     break;
255   }
256 
257   default:
258     llvm_unreachable("invalid stdlib name");
259   }
260 }
261 
262 void Fuchsia::AddCXXStdlibLibArgs(const ArgList &Args,
263                                   ArgStringList &CmdArgs) const {
264   switch (GetCXXStdlibType(Args)) {
265   case ToolChain::CST_Libcxx:
266     CmdArgs.push_back("-lc++");
267     break;
268 
269   case ToolChain::CST_Libstdcxx:
270     llvm_unreachable("invalid stdlib name");
271   }
272 }
273 
274 SanitizerMask Fuchsia::getSupportedSanitizers() const {
275   SanitizerMask Res = ToolChain::getSupportedSanitizers();
276   Res |= SanitizerKind::Address;
277   Res |= SanitizerKind::Fuzzer;
278   Res |= SanitizerKind::FuzzerNoLink;
279   Res |= SanitizerKind::SafeStack;
280   Res |= SanitizerKind::Scudo;
281   return Res;
282 }
283 
284 SanitizerMask Fuchsia::getDefaultSanitizers() const {
285   return SanitizerKind::SafeStack;
286 }
287