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::stem(Exec).equals_lower("lld")) {
48     CmdArgs.push_back("-flavor");
49     CmdArgs.push_back("gnu");
50 
51     CmdArgs.push_back("-z");
52     CmdArgs.push_back("rodynamic");
53   }
54 
55   if (!D.SysRoot.empty())
56     CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
57 
58   if (!Args.hasArg(options::OPT_shared) && !Args.hasArg(options::OPT_r))
59     CmdArgs.push_back("-pie");
60 
61   if (Args.hasArg(options::OPT_rdynamic))
62     CmdArgs.push_back("-export-dynamic");
63 
64   if (Args.hasArg(options::OPT_s))
65     CmdArgs.push_back("-s");
66 
67   if (Args.hasArg(options::OPT_r)) {
68     CmdArgs.push_back("-r");
69   } else {
70     CmdArgs.push_back("--build-id");
71     CmdArgs.push_back("--hash-style=gnu");
72   }
73 
74   CmdArgs.push_back("--eh-frame-hdr");
75 
76   if (Args.hasArg(options::OPT_static))
77     CmdArgs.push_back("-Bstatic");
78   else if (Args.hasArg(options::OPT_shared))
79     CmdArgs.push_back("-shared");
80 
81   if (!Args.hasArg(options::OPT_shared)) {
82     std::string Dyld = D.DyldPrefix;
83     if (ToolChain.getSanitizerArgs().needsAsanRt() &&
84         ToolChain.getSanitizerArgs().needsSharedAsanRt())
85       Dyld += "asan/";
86     Dyld += "ld.so.1";
87     CmdArgs.push_back("-dynamic-linker");
88     CmdArgs.push_back(Args.MakeArgString(Dyld));
89   }
90 
91   CmdArgs.push_back("-o");
92   CmdArgs.push_back(Output.getFilename());
93 
94   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
95     if (!Args.hasArg(options::OPT_shared)) {
96       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("Scrt1.o")));
97     }
98   }
99 
100   Args.AddAllArgs(CmdArgs, options::OPT_L);
101   Args.AddAllArgs(CmdArgs, options::OPT_u);
102 
103   ToolChain.AddFilePathLibArgs(Args, CmdArgs);
104 
105   addSanitizerRuntimes(ToolChain, Args, CmdArgs);
106 
107   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
108 
109   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
110     if (Args.hasArg(options::OPT_static))
111       CmdArgs.push_back("-Bdynamic");
112 
113     if (D.CCCIsCXX()) {
114       if (ToolChain.ShouldLinkCXXStdlib(Args))
115         ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
116       CmdArgs.push_back("-lm");
117     }
118 
119     AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
120 
121     if (Args.hasArg(options::OPT_pthread) ||
122         Args.hasArg(options::OPT_pthreads))
123       CmdArgs.push_back("-lpthread");
124 
125     if (Args.hasArg(options::OPT_fsplit_stack))
126       CmdArgs.push_back("--wrap=pthread_create");
127 
128     CmdArgs.push_back("-lc");
129   }
130 
131   C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
132 }
133 
134 /// Fuchsia - Fuchsia tool chain which can call as(1) and ld(1) directly.
135 
136 static std::string normalizeTriple(llvm::Triple Triple) {
137   SmallString<64> T;
138   T += Triple.getArchName();
139   T += "-";
140   T += Triple.getOSName();
141   return T.str();
142 }
143 
144 static std::string getTargetDir(const Driver &D,
145                                 llvm::Triple Triple) {
146   SmallString<128> P(llvm::sys::path::parent_path(D.Dir));
147   llvm::sys::path::append(P, "lib", normalizeTriple(Triple));
148   return P.str();
149 }
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   SmallString<128> P(getTargetDir(D, getTriple()));
159   llvm::sys::path::append(P, "lib");
160   getFilePaths().push_back(P.str());
161 
162   if (!D.SysRoot.empty()) {
163     SmallString<128> P(D.SysRoot);
164     llvm::sys::path::append(P, "lib");
165     getFilePaths().push_back(P.str());
166   }
167 }
168 
169 std::string Fuchsia::ComputeEffectiveClangTriple(const ArgList &Args,
170                                                  types::ID InputType) const {
171   llvm::Triple Triple(ComputeLLVMTriple(Args, InputType));
172   Triple.setTriple(normalizeTriple(Triple));
173   return Triple.getTriple();
174 }
175 
176 Tool *Fuchsia::buildLinker() const {
177   return new tools::fuchsia::Linker(*this);
178 }
179 
180 ToolChain::RuntimeLibType Fuchsia::GetRuntimeLibType(
181     const ArgList &Args) const {
182   if (Arg *A = Args.getLastArg(clang::driver::options::OPT_rtlib_EQ)) {
183     StringRef Value = A->getValue();
184     if (Value != "compiler-rt")
185       getDriver().Diag(clang::diag::err_drv_invalid_rtlib_name)
186           << A->getAsString(Args);
187   }
188 
189   return ToolChain::RLT_CompilerRT;
190 }
191 
192 ToolChain::CXXStdlibType
193 Fuchsia::GetCXXStdlibType(const ArgList &Args) const {
194   if (Arg *A = Args.getLastArg(options::OPT_stdlib_EQ)) {
195     StringRef Value = A->getValue();
196     if (Value != "libc++")
197       getDriver().Diag(diag::err_drv_invalid_stdlib_name)
198         << A->getAsString(Args);
199   }
200 
201   return ToolChain::CST_Libcxx;
202 }
203 
204 void Fuchsia::addClangTargetOptions(const ArgList &DriverArgs,
205                                     ArgStringList &CC1Args,
206                                     Action::OffloadKind) const {
207   if (DriverArgs.hasFlag(options::OPT_fuse_init_array,
208                          options::OPT_fno_use_init_array, true))
209     CC1Args.push_back("-fuse-init-array");
210 }
211 
212 void Fuchsia::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
213                                         ArgStringList &CC1Args) const {
214   const Driver &D = getDriver();
215 
216   if (DriverArgs.hasArg(options::OPT_nostdinc))
217     return;
218 
219   if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
220     SmallString<128> P(D.ResourceDir);
221     llvm::sys::path::append(P, "include");
222     addSystemInclude(DriverArgs, CC1Args, P);
223   }
224 
225   if (DriverArgs.hasArg(options::OPT_nostdlibinc))
226     return;
227 
228   // Check for configure-time C include directories.
229   StringRef CIncludeDirs(C_INCLUDE_DIRS);
230   if (CIncludeDirs != "") {
231     SmallVector<StringRef, 5> dirs;
232     CIncludeDirs.split(dirs, ":");
233     for (StringRef dir : dirs) {
234       StringRef Prefix =
235           llvm::sys::path::is_absolute(dir) ? StringRef(D.SysRoot) : "";
236       addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir);
237     }
238     return;
239   }
240 
241   if (!D.SysRoot.empty()) {
242     SmallString<128> P(D.SysRoot);
243     llvm::sys::path::append(P, "include");
244     addExternCSystemInclude(DriverArgs, CC1Args, P.str());
245   }
246 }
247 
248 void Fuchsia::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
249                                            ArgStringList &CC1Args) const {
250   if (DriverArgs.hasArg(options::OPT_nostdlibinc) ||
251       DriverArgs.hasArg(options::OPT_nostdincxx))
252     return;
253 
254   switch (GetCXXStdlibType(DriverArgs)) {
255   case ToolChain::CST_Libcxx: {
256     SmallString<128> P(getTargetDir(getDriver(), getTriple()));
257     llvm::sys::path::append(P, "include", "c++", "v1");
258     addSystemInclude(DriverArgs, CC1Args, P.str());
259     break;
260   }
261 
262   default:
263     llvm_unreachable("invalid stdlib name");
264   }
265 }
266 
267 void Fuchsia::AddCXXStdlibLibArgs(const ArgList &Args,
268                                   ArgStringList &CmdArgs) const {
269   switch (GetCXXStdlibType(Args)) {
270   case ToolChain::CST_Libcxx:
271     CmdArgs.push_back("-lc++");
272     CmdArgs.push_back("-lc++abi");
273     CmdArgs.push_back("-lunwind");
274     break;
275 
276   case ToolChain::CST_Libstdcxx:
277     llvm_unreachable("invalid stdlib name");
278   }
279 }
280 
281 SanitizerMask Fuchsia::getSupportedSanitizers() const {
282   SanitizerMask Res = ToolChain::getSupportedSanitizers();
283   Res |= SanitizerKind::SafeStack;
284   Res |= SanitizerKind::Address;
285   return Res;
286 }
287