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 "llvm/Option/ArgList.h"
18 #include "llvm/Support/Path.h"
19 
20 using namespace clang::driver;
21 using namespace clang::driver::toolchains;
22 using namespace clang::driver::tools;
23 using namespace clang;
24 using namespace llvm::opt;
25 
26 void 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::stem(Exec).equals_lower("lld")) {
47     CmdArgs.push_back("-flavor");
48     CmdArgs.push_back("gnu");
49   }
50 
51   if (!D.SysRoot.empty())
52     CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
53 
54   if (!Args.hasArg(options::OPT_shared) && !Args.hasArg(options::OPT_r))
55     CmdArgs.push_back("-pie");
56 
57   if (Args.hasArg(options::OPT_rdynamic))
58     CmdArgs.push_back("-export-dynamic");
59 
60   if (Args.hasArg(options::OPT_s))
61     CmdArgs.push_back("-s");
62 
63   if (Args.hasArg(options::OPT_r))
64     CmdArgs.push_back("-r");
65   else
66     CmdArgs.push_back("--build-id");
67 
68   if (!Args.hasArg(options::OPT_static))
69     CmdArgs.push_back("--eh-frame-hdr");
70 
71   if (Args.hasArg(options::OPT_static))
72     CmdArgs.push_back("-Bstatic");
73   else if (Args.hasArg(options::OPT_shared))
74     CmdArgs.push_back("-shared");
75 
76   if (!Args.hasArg(options::OPT_static)) {
77     if (Args.hasArg(options::OPT_rdynamic))
78       CmdArgs.push_back("-export-dynamic");
79 
80     if (!Args.hasArg(options::OPT_shared)) {
81       CmdArgs.push_back("-dynamic-linker");
82       CmdArgs.push_back(Args.MakeArgString(D.DyldPrefix + "ld.so.1"));
83     }
84   }
85 
86   CmdArgs.push_back("-o");
87   CmdArgs.push_back(Output.getFilename());
88 
89   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
90     if (!Args.hasArg(options::OPT_shared)) {
91       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("Scrt1.o")));
92     }
93   }
94 
95   Args.AddAllArgs(CmdArgs, options::OPT_L);
96   Args.AddAllArgs(CmdArgs, options::OPT_u);
97 
98   ToolChain.AddFilePathLibArgs(Args, CmdArgs);
99 
100   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
101 
102   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
103     if (Args.hasArg(options::OPT_static))
104       CmdArgs.push_back("-Bdynamic");
105 
106     if (D.CCCIsCXX()) {
107       bool OnlyLibstdcxxStatic = Args.hasArg(options::OPT_static_libstdcxx) &&
108                                  !Args.hasArg(options::OPT_static);
109       if (OnlyLibstdcxxStatic)
110         CmdArgs.push_back("-Bstatic");
111       ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
112       if (OnlyLibstdcxxStatic)
113         CmdArgs.push_back("-Bdynamic");
114       CmdArgs.push_back("-lm");
115     }
116 
117     AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
118 
119     if (Args.hasArg(options::OPT_pthread) ||
120         Args.hasArg(options::OPT_pthreads))
121       CmdArgs.push_back("-lpthread");
122 
123     if (Args.hasArg(options::OPT_fsplit_stack))
124       CmdArgs.push_back("--wrap=pthread_create");
125 
126     CmdArgs.push_back("-lc");
127   }
128 
129   C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
130 }
131 
132 /// Fuchsia - Fuchsia tool chain which can call as(1) and ld(1) directly.
133 
134 Fuchsia::Fuchsia(const Driver &D, const llvm::Triple &Triple,
135                  const ArgList &Args)
136     : Generic_ELF(D, Triple, Args) {
137 
138   getFilePaths().push_back(D.SysRoot + "/lib");
139   getFilePaths().push_back(D.ResourceDir + "/lib/fuchsia");
140 }
141 
142 Tool *Fuchsia::buildAssembler() const {
143   return new tools::gnutools::Assembler(*this);
144 }
145 
146 Tool *Fuchsia::buildLinker() const {
147   return new tools::fuchsia::Linker(*this);
148 }
149 
150 ToolChain::RuntimeLibType Fuchsia::GetRuntimeLibType(
151     const ArgList &Args) const {
152   if (Arg *A = Args.getLastArg(clang::driver::options::OPT_rtlib_EQ)) {
153     StringRef Value = A->getValue();
154     if (Value != "compiler-rt")
155       getDriver().Diag(clang::diag::err_drv_invalid_rtlib_name)
156           << A->getAsString(Args);
157   }
158 
159   return ToolChain::RLT_CompilerRT;
160 }
161 
162 ToolChain::CXXStdlibType
163 Fuchsia::GetCXXStdlibType(const ArgList &Args) const {
164   if (Arg *A = Args.getLastArg(options::OPT_stdlib_EQ)) {
165     StringRef Value = A->getValue();
166     if (Value != "libc++")
167       getDriver().Diag(diag::err_drv_invalid_stdlib_name)
168         << A->getAsString(Args);
169   }
170 
171   return ToolChain::CST_Libcxx;
172 }
173 
174 void Fuchsia::addClangTargetOptions(const ArgList &DriverArgs,
175                                     ArgStringList &CC1Args) const {
176   if (DriverArgs.hasFlag(options::OPT_fuse_init_array,
177                          options::OPT_fno_use_init_array, true))
178     CC1Args.push_back("-fuse-init-array");
179 }
180 
181 void Fuchsia::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
182                                         ArgStringList &CC1Args) const {
183   const Driver &D = getDriver();
184 
185   if (DriverArgs.hasArg(options::OPT_nostdinc))
186     return;
187 
188   if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
189     SmallString<128> P(D.ResourceDir);
190     llvm::sys::path::append(P, "include");
191     addSystemInclude(DriverArgs, CC1Args, P);
192   }
193 
194   if (DriverArgs.hasArg(options::OPT_nostdlibinc))
195     return;
196 
197   // Check for configure-time C include directories.
198   StringRef CIncludeDirs(C_INCLUDE_DIRS);
199   if (CIncludeDirs != "") {
200     SmallVector<StringRef, 5> dirs;
201     CIncludeDirs.split(dirs, ":");
202     for (StringRef dir : dirs) {
203       StringRef Prefix =
204           llvm::sys::path::is_absolute(dir) ? StringRef(D.SysRoot) : "";
205       addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir);
206     }
207     return;
208   }
209 
210   addExternCSystemInclude(DriverArgs, CC1Args, D.SysRoot + "/include");
211 }
212 
213 std::string Fuchsia::findLibCxxIncludePath() const {
214   return getDriver().SysRoot + "/include/c++/v1";
215 }
216 
217 void Fuchsia::AddCXXStdlibLibArgs(const ArgList &Args,
218                                   ArgStringList &CmdArgs) const {
219   (void) GetCXXStdlibType(Args);
220   CmdArgs.push_back("-lc++");
221   CmdArgs.push_back("-lc++abi");
222   CmdArgs.push_back("-lunwind");
223 }
224 
225 SanitizerMask Fuchsia::getSupportedSanitizers() const {
226   SanitizerMask Res = ToolChain::getSupportedSanitizers();
227   Res |= SanitizerKind::SafeStack;
228   return Res;
229 }
230