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1 //===--- Fuchsia.cpp - Fuchsia ToolChain Implementations --------*- C++ -*-===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #include "Fuchsia.h"
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10 #include "CommonArgs.h"
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11 #include "clang/Config/config.h"
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12 #include "clang/Driver/Compilation.h"
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13 #include "clang/Driver/Driver.h"
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14 #include "clang/Driver/DriverDiagnostic.h"
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15 #include "clang/Driver/Options.h"
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16 #include "clang/Driver/SanitizerArgs.h"
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17 #include "llvm/Option/ArgList.h"
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221
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18 #include "llvm/ProfileData/InstrProf.h"
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150
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19 #include "llvm/Support/FileSystem.h"
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20 #include "llvm/Support/Path.h"
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21 #include "llvm/Support/VirtualFileSystem.h"
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22
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23 using namespace clang::driver;
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24 using namespace clang::driver::toolchains;
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25 using namespace clang::driver::tools;
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26 using namespace clang;
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27 using namespace llvm::opt;
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28
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29 using tools::addMultilibFlag;
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30
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31 void fuchsia::Linker::ConstructJob(Compilation &C, const JobAction &JA,
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32 const InputInfo &Output,
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33 const InputInfoList &Inputs,
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34 const ArgList &Args,
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35 const char *LinkingOutput) const {
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36 const toolchains::Fuchsia &ToolChain =
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37 static_cast<const toolchains::Fuchsia &>(getToolChain());
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38 const Driver &D = ToolChain.getDriver();
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39
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40 ArgStringList CmdArgs;
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41
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42 // Silence warning for "clang -g foo.o -o foo"
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43 Args.ClaimAllArgs(options::OPT_g_Group);
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44 // and "clang -emit-llvm foo.o -o foo"
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45 Args.ClaimAllArgs(options::OPT_emit_llvm);
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46 // and for "clang -w foo.o -o foo". Other warning options are already
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47 // handled somewhere else.
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48 Args.ClaimAllArgs(options::OPT_w);
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49
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50 CmdArgs.push_back("-z");
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173
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51 CmdArgs.push_back("max-page-size=4096");
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52
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53 CmdArgs.push_back("-z");
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150
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54 CmdArgs.push_back("now");
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55
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56 const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
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57 if (llvm::sys::path::filename(Exec).equals_lower("ld.lld") ||
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58 llvm::sys::path::stem(Exec).equals_lower("ld.lld")) {
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59 CmdArgs.push_back("-z");
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60 CmdArgs.push_back("rodynamic");
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61 CmdArgs.push_back("-z");
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62 CmdArgs.push_back("separate-loadable-segments");
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173
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63 CmdArgs.push_back("--pack-dyn-relocs=relr");
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150
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64 }
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65
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66 if (!D.SysRoot.empty())
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67 CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
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68
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69 if (!Args.hasArg(options::OPT_shared) && !Args.hasArg(options::OPT_r))
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70 CmdArgs.push_back("-pie");
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71
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72 if (Args.hasArg(options::OPT_rdynamic))
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73 CmdArgs.push_back("-export-dynamic");
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74
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75 if (Args.hasArg(options::OPT_s))
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76 CmdArgs.push_back("-s");
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77
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78 if (Args.hasArg(options::OPT_r)) {
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79 CmdArgs.push_back("-r");
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80 } else {
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81 CmdArgs.push_back("--build-id");
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82 CmdArgs.push_back("--hash-style=gnu");
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83 }
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84
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85 CmdArgs.push_back("--eh-frame-hdr");
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86
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87 if (Args.hasArg(options::OPT_static))
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88 CmdArgs.push_back("-Bstatic");
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89 else if (Args.hasArg(options::OPT_shared))
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90 CmdArgs.push_back("-shared");
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91
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92 const SanitizerArgs &SanArgs = ToolChain.getSanitizerArgs();
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93
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94 if (!Args.hasArg(options::OPT_shared)) {
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95 std::string Dyld = D.DyldPrefix;
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96 if (SanArgs.needsAsanRt() && SanArgs.needsSharedRt())
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97 Dyld += "asan/";
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221
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98 if (SanArgs.needsHwasanRt() && SanArgs.needsSharedRt())
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99 Dyld += "hwasan/";
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100 if (SanArgs.needsTsanRt() && SanArgs.needsSharedRt())
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101 Dyld += "tsan/";
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150
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102 Dyld += "ld.so.1";
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103 CmdArgs.push_back("-dynamic-linker");
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104 CmdArgs.push_back(Args.MakeArgString(Dyld));
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105 }
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106
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107 CmdArgs.push_back("-o");
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108 CmdArgs.push_back(Output.getFilename());
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109
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110 if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
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111 if (!Args.hasArg(options::OPT_shared)) {
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112 CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("Scrt1.o")));
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113 }
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114 }
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115
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116 Args.AddAllArgs(CmdArgs, options::OPT_L);
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117 Args.AddAllArgs(CmdArgs, options::OPT_u);
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118
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119 ToolChain.AddFilePathLibArgs(Args, CmdArgs);
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120
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121 if (D.isUsingLTO()) {
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122 assert(!Inputs.empty() && "Must have at least one input.");
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173
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123 addLTOOptions(ToolChain, Args, CmdArgs, Output, Inputs[0],
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124 D.getLTOMode() == LTOK_Thin);
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125 }
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126
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127 bool NeedsSanitizerDeps = addSanitizerRuntimes(ToolChain, Args, CmdArgs);
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128 bool NeedsXRayDeps = addXRayRuntime(ToolChain, Args, CmdArgs);
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129 AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
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130 ToolChain.addProfileRTLibs(Args, CmdArgs);
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131
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132 if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
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133 if (Args.hasArg(options::OPT_static))
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134 CmdArgs.push_back("-Bdynamic");
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135
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136 if (D.CCCIsCXX()) {
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137 if (ToolChain.ShouldLinkCXXStdlib(Args)) {
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138 bool OnlyLibstdcxxStatic = Args.hasArg(options::OPT_static_libstdcxx) &&
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139 !Args.hasArg(options::OPT_static);
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140 CmdArgs.push_back("--push-state");
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141 CmdArgs.push_back("--as-needed");
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142 if (OnlyLibstdcxxStatic)
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143 CmdArgs.push_back("-Bstatic");
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144 ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
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145 if (OnlyLibstdcxxStatic)
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146 CmdArgs.push_back("-Bdynamic");
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147 CmdArgs.push_back("-lm");
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148 CmdArgs.push_back("--pop-state");
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149 }
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150 }
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151
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152 if (NeedsSanitizerDeps)
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153 linkSanitizerRuntimeDeps(ToolChain, CmdArgs);
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154
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155 if (NeedsXRayDeps)
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156 linkXRayRuntimeDeps(ToolChain, CmdArgs);
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157
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158 AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
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159
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160 if (Args.hasArg(options::OPT_pthread) ||
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161 Args.hasArg(options::OPT_pthreads))
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162 CmdArgs.push_back("-lpthread");
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163
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164 if (Args.hasArg(options::OPT_fsplit_stack))
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165 CmdArgs.push_back("--wrap=pthread_create");
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166
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167 if (!Args.hasArg(options::OPT_nolibc))
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168 CmdArgs.push_back("-lc");
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169 }
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170
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221
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171 C.addCommand(std::make_unique<Command>(JA, *this, ResponseFileSupport::None(),
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172 Exec, CmdArgs, Inputs, Output));
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150
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173 }
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174
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175 /// Fuchsia - Fuchsia tool chain which can call as(1) and ld(1) directly.
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176
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177 Fuchsia::Fuchsia(const Driver &D, const llvm::Triple &Triple,
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178 const ArgList &Args)
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179 : ToolChain(D, Triple, Args) {
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180 getProgramPaths().push_back(getDriver().getInstalledDir());
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181 if (getDriver().getInstalledDir() != D.Dir)
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182 getProgramPaths().push_back(D.Dir);
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183
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184 if (!D.SysRoot.empty()) {
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185 SmallString<128> P(D.SysRoot);
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186 llvm::sys::path::append(P, "lib");
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187 getFilePaths().push_back(std::string(P.str()));
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188 }
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189
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190 auto FilePaths = [&](const Multilib &M) -> std::vector<std::string> {
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191 std::vector<std::string> FP;
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221
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192 SmallString<128> P(getStdlibPath());
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193 llvm::sys::path::append(P, M.gccSuffix());
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194 FP.push_back(std::string(P.str()));
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150
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195 return FP;
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196 };
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197
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198 Multilibs.push_back(Multilib());
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199 // Use the noexcept variant with -fno-exceptions to avoid the extra overhead.
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200 Multilibs.push_back(Multilib("noexcept", {}, {}, 1)
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201 .flag("-fexceptions")
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202 .flag("+fno-exceptions"));
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203 // ASan has higher priority because we always want the instrumentated version.
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204 Multilibs.push_back(Multilib("asan", {}, {}, 2)
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205 .flag("+fsanitize=address"));
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206 // Use the asan+noexcept variant with ASan and -fno-exceptions.
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207 Multilibs.push_back(Multilib("asan+noexcept", {}, {}, 3)
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208 .flag("+fsanitize=address")
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209 .flag("-fexceptions")
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210 .flag("+fno-exceptions"));
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221
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211 // HWASan has higher priority because we always want the instrumentated
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212 // version.
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213 Multilibs.push_back(
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214 Multilib("hwasan", {}, {}, 4).flag("+fsanitize=hwaddress"));
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215 // Use the hwasan+noexcept variant with HWASan and -fno-exceptions.
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216 Multilibs.push_back(Multilib("hwasan+noexcept", {}, {}, 5)
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217 .flag("+fsanitize=hwaddress")
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218 .flag("-fexceptions")
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219 .flag("+fno-exceptions"));
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220 // Use the relative vtables ABI.
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221 // TODO: Remove these multilibs once relative vtables are enabled by default
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222 // for Fuchsia.
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223 Multilibs.push_back(Multilib("relative-vtables", {}, {}, 6)
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224 .flag("+fexperimental-relative-c++-abi-vtables"));
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225 Multilibs.push_back(Multilib("relative-vtables+noexcept", {}, {}, 7)
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226 .flag("+fexperimental-relative-c++-abi-vtables")
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227 .flag("-fexceptions")
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228 .flag("+fno-exceptions"));
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229 Multilibs.push_back(Multilib("relative-vtables+asan", {}, {}, 8)
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230 .flag("+fexperimental-relative-c++-abi-vtables")
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231 .flag("+fsanitize=address"));
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232 Multilibs.push_back(Multilib("relative-vtables+asan+noexcept", {}, {}, 9)
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233 .flag("+fexperimental-relative-c++-abi-vtables")
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234 .flag("+fsanitize=address")
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235 .flag("-fexceptions")
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236 .flag("+fno-exceptions"));
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237 Multilibs.push_back(Multilib("relative-vtables+hwasan", {}, {}, 10)
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238 .flag("+fexperimental-relative-c++-abi-vtables")
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239 .flag("+fsanitize=hwaddress"));
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240 Multilibs.push_back(Multilib("relative-vtables+hwasan+noexcept", {}, {}, 11)
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241 .flag("+fexperimental-relative-c++-abi-vtables")
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242 .flag("+fsanitize=hwaddress")
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243 .flag("-fexceptions")
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244 .flag("+fno-exceptions"));
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245 // Use Itanium C++ ABI for the compat multilib.
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246 Multilibs.push_back(Multilib("compat", {}, {}, 12).flag("+fc++-abi=itanium"));
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247
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248 Multilibs.FilterOut([&](const Multilib &M) {
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249 std::vector<std::string> RD = FilePaths(M);
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250 return std::all_of(RD.begin(), RD.end(), [&](std::string P) {
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251 return !getVFS().exists(P);
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252 });
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253 });
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254
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255 Multilib::flags_list Flags;
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256 addMultilibFlag(
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257 Args.hasFlag(options::OPT_fexceptions, options::OPT_fno_exceptions, true),
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258 "fexceptions", Flags);
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259 addMultilibFlag(getSanitizerArgs().needsAsanRt(), "fsanitize=address", Flags);
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221
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260 addMultilibFlag(getSanitizerArgs().needsHwasanRt(), "fsanitize=hwaddress",
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261 Flags);
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262
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263 addMultilibFlag(
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264 Args.hasFlag(options::OPT_fexperimental_relative_cxx_abi_vtables,
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265 options::OPT_fno_experimental_relative_cxx_abi_vtables,
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266 /*default=*/false),
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267 "fexperimental-relative-c++-abi-vtables", Flags);
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268 addMultilibFlag(Args.getLastArgValue(options::OPT_fcxx_abi_EQ) == "itanium",
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269 "fc++-abi=itanium", Flags);
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270
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150
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271 Multilibs.setFilePathsCallback(FilePaths);
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272
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273 if (Multilibs.select(Flags, SelectedMultilib))
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274 if (!SelectedMultilib.isDefault())
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275 if (const auto &PathsCallback = Multilibs.filePathsCallback())
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276 for (const auto &Path : PathsCallback(SelectedMultilib))
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277 // Prepend the multilib path to ensure it takes the precedence.
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278 getFilePaths().insert(getFilePaths().begin(), Path);
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279 }
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280
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281 std::string Fuchsia::ComputeEffectiveClangTriple(const ArgList &Args,
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282 types::ID InputType) const {
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283 llvm::Triple Triple(ComputeLLVMTriple(Args, InputType));
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284 return Triple.str();
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285 }
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286
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287 Tool *Fuchsia::buildLinker() const {
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288 return new tools::fuchsia::Linker(*this);
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289 }
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290
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291 ToolChain::RuntimeLibType Fuchsia::GetRuntimeLibType(
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292 const ArgList &Args) const {
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293 if (Arg *A = Args.getLastArg(clang::driver::options::OPT_rtlib_EQ)) {
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294 StringRef Value = A->getValue();
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295 if (Value != "compiler-rt")
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296 getDriver().Diag(clang::diag::err_drv_invalid_rtlib_name)
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297 << A->getAsString(Args);
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298 }
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299
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300 return ToolChain::RLT_CompilerRT;
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301 }
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302
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303 ToolChain::CXXStdlibType
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304 Fuchsia::GetCXXStdlibType(const ArgList &Args) const {
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305 if (Arg *A = Args.getLastArg(options::OPT_stdlib_EQ)) {
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306 StringRef Value = A->getValue();
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307 if (Value != "libc++")
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308 getDriver().Diag(diag::err_drv_invalid_stdlib_name)
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309 << A->getAsString(Args);
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310 }
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311
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312 return ToolChain::CST_Libcxx;
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313 }
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314
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315 void Fuchsia::addClangTargetOptions(const ArgList &DriverArgs,
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316 ArgStringList &CC1Args,
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317 Action::OffloadKind) const {
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318 if (!DriverArgs.hasFlag(options::OPT_fuse_init_array,
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319 options::OPT_fno_use_init_array, true))
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320 CC1Args.push_back("-fno-use-init-array");
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321 }
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322
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323 void Fuchsia::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
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324 ArgStringList &CC1Args) const {
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325 const Driver &D = getDriver();
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326
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327 if (DriverArgs.hasArg(options::OPT_nostdinc))
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328 return;
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329
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330 if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
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331 SmallString<128> P(D.ResourceDir);
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332 llvm::sys::path::append(P, "include");
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333 addSystemInclude(DriverArgs, CC1Args, P);
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334 }
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335
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336 if (DriverArgs.hasArg(options::OPT_nostdlibinc))
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337 return;
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338
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339 // Check for configure-time C include directories.
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340 StringRef CIncludeDirs(C_INCLUDE_DIRS);
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341 if (CIncludeDirs != "") {
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342 SmallVector<StringRef, 5> dirs;
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343 CIncludeDirs.split(dirs, ":");
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344 for (StringRef dir : dirs) {
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345 StringRef Prefix =
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173
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346 llvm::sys::path::is_absolute(dir) ? "" : StringRef(D.SysRoot);
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150
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347 addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir);
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348 }
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349 return;
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350 }
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351
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352 if (!D.SysRoot.empty()) {
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353 SmallString<128> P(D.SysRoot);
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354 llvm::sys::path::append(P, "include");
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355 addExternCSystemInclude(DriverArgs, CC1Args, P.str());
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356 }
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357 }
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358
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359 void Fuchsia::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
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360 ArgStringList &CC1Args) const {
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361 if (DriverArgs.hasArg(options::OPT_nostdlibinc) ||
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362 DriverArgs.hasArg(options::OPT_nostdincxx))
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363 return;
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364
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221
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365 const Driver &D = getDriver();
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366 std::string Target = getTripleString();
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367
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368 auto AddCXXIncludePath = [&](StringRef Path) {
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369 std::string Version = detectLibcxxVersion(Path);
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370 if (Version.empty())
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371 return;
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372
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373 // First add the per-target include path.
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374 SmallString<128> TargetDir(Path);
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375 llvm::sys::path::append(TargetDir, Target, "c++", Version);
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376 if (getVFS().exists(TargetDir))
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377 addSystemInclude(DriverArgs, CC1Args, TargetDir);
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378
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379 // Second add the generic one.
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380 SmallString<128> Dir(Path);
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381 llvm::sys::path::append(Dir, "c++", Version);
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382 addSystemInclude(DriverArgs, CC1Args, Dir);
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383 };
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384
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150
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385 switch (GetCXXStdlibType(DriverArgs)) {
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386 case ToolChain::CST_Libcxx: {
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221
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387 SmallString<128> P(D.Dir);
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388 llvm::sys::path::append(P, "..", "include");
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389 AddCXXIncludePath(P);
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150
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390 break;
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391 }
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392
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393 default:
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394 llvm_unreachable("invalid stdlib name");
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395 }
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396 }
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397
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398 void Fuchsia::AddCXXStdlibLibArgs(const ArgList &Args,
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399 ArgStringList &CmdArgs) const {
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400 switch (GetCXXStdlibType(Args)) {
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401 case ToolChain::CST_Libcxx:
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402 CmdArgs.push_back("-lc++");
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403 break;
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404
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405 case ToolChain::CST_Libstdcxx:
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406 llvm_unreachable("invalid stdlib name");
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407 }
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408 }
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409
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410 SanitizerMask Fuchsia::getSupportedSanitizers() const {
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411 SanitizerMask Res = ToolChain::getSupportedSanitizers();
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412 Res |= SanitizerKind::Address;
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221
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413 Res |= SanitizerKind::HWAddress;
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|
150
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414 Res |= SanitizerKind::PointerCompare;
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415 Res |= SanitizerKind::PointerSubtract;
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416 Res |= SanitizerKind::Fuzzer;
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417 Res |= SanitizerKind::FuzzerNoLink;
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418 Res |= SanitizerKind::Leak;
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419 Res |= SanitizerKind::SafeStack;
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420 Res |= SanitizerKind::Scudo;
|
|
221
|
421 Res |= SanitizerKind::Thread;
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|
150
|
422 return Res;
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|
|
423 }
|
|
|
424
|
|
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425 SanitizerMask Fuchsia::getDefaultSanitizers() const {
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|
|
426 SanitizerMask Res;
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|
|
427 switch (getTriple().getArch()) {
|
|
|
428 case llvm::Triple::aarch64:
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|
|
429 Res |= SanitizerKind::ShadowCallStack;
|
|
|
430 break;
|
|
|
431 case llvm::Triple::x86_64:
|
|
|
432 Res |= SanitizerKind::SafeStack;
|
|
|
433 break;
|
|
|
434 default:
|
|
|
435 // TODO: Enable SafeStack on RISC-V once tested.
|
|
|
436 break;
|
|
|
437 }
|
|
|
438 return Res;
|
|
|
439 }
|
|
221
|
440
|
|
|
441 void Fuchsia::addProfileRTLibs(const llvm::opt::ArgList &Args,
|
|
|
442 llvm::opt::ArgStringList &CmdArgs) const {
|
|
|
443 // Add linker option -u__llvm_profile_runtime to cause runtime
|
|
|
444 // initialization module to be linked in.
|
|
|
445 if (needsProfileRT(Args))
|
|
|
446 CmdArgs.push_back(Args.MakeArgString(
|
|
|
447 Twine("-u", llvm::getInstrProfRuntimeHookVarName())));
|
|
|
448 ToolChain::addProfileRTLibs(Args, CmdArgs);
|
|
|
449 }
|
