clang/lib/Driver/ToolChains/CrossWindows.cpp

   1 //===-- CrossWindows.cpp - Cross Windows Tool Chain -----------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "CrossWindows.h"
  10 #include "CommonArgs.h"
  11 #include "clang/Driver/Compilation.h"
  12 #include "clang/Driver/Driver.h"
  13 #include "clang/Driver/Options.h"
  14 #include "clang/Driver/SanitizerArgs.h"
  15 #include "llvm/Option/ArgList.h"
  16 #include "llvm/Support/Path.h"
  17
  18 using namespace clang::driver;
  19 using namespace clang::driver::toolchains;
  20
  21 using llvm::opt::ArgList;
  22 using llvm::opt::ArgStringList;
  23
  24 void tools::CrossWindows::Assembler::ConstructJob(
  25     Compilation &C, const JobAction &JA, const InputInfo &Output,
  26     const InputInfoList &Inputs, const ArgList &Args,
  27     const char *LinkingOutput) const {
  28   claimNoWarnArgs(Args);
  29   const auto &TC =
  30       static_cast<const toolchains::CrossWindowsToolChain &>(getToolChain());
  31   ArgStringList CmdArgs;
  32   const char *Exec;
  33
  34   switch (TC.getArch()) {
  35   default:
  36     llvm_unreachable("unsupported architecture");
  37   case llvm::Triple::arm:
  38   case llvm::Triple::thumb:
  39   case llvm::Triple::aarch64:
  40     break;
  41   case llvm::Triple::x86:
  42     CmdArgs.push_back("--32");
  43     break;
  44   case llvm::Triple::x86_64:
  45     CmdArgs.push_back("--64");
  46     break;
  47   }
  48
  49   Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
  50
  51   CmdArgs.push_back("-o");
  52   CmdArgs.push_back(Output.getFilename());
  53
  54   for (const auto &Input : Inputs)
  55     CmdArgs.push_back(Input.getFilename());
  56
  57   const std::string Assembler = TC.GetProgramPath("as");
  58   Exec = Args.MakeArgString(Assembler);
  59
  60   C.addCommand(std::make_unique<Command>(JA, *this, ResponseFileSupport::None(),
  61                                          Exec, CmdArgs, Inputs, Output));
  62 }
  63
  64 void tools::CrossWindows::Linker::ConstructJob(
  65     Compilation &C, const JobAction &JA, const InputInfo &Output,
  66     const InputInfoList &Inputs, const ArgList &Args,
  67     const char *LinkingOutput) const {
  68   const auto &TC =
  69       static_cast<const toolchains::CrossWindowsToolChain &>(getToolChain());
  70   const llvm::Triple &T = TC.getTriple();
  71   const Driver &D = TC.getDriver();
  72   SmallString<128> EntryPoint;
  73   ArgStringList CmdArgs;
  74   const char *Exec;
  75
  76   // Silence warning for "clang -g foo.o -o foo"
  77   Args.ClaimAllArgs(options::OPT_g_Group);
  78   // and "clang -emit-llvm foo.o -o foo"
  79   Args.ClaimAllArgs(options::OPT_emit_llvm);
  80   // and for "clang -w foo.o -o foo"
  81   Args.ClaimAllArgs(options::OPT_w);
  82   // Other warning options are already handled somewhere else.
  83
  84   if (!D.SysRoot.empty())
  85     CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
  86
  87   if (Args.hasArg(options::OPT_pie))
  88     CmdArgs.push_back("-pie");
  89   if (Args.hasArg(options::OPT_rdynamic))
  90     CmdArgs.push_back("-export-dynamic");
  91   if (Args.hasArg(options::OPT_s))
  92     CmdArgs.push_back("--strip-all");
  93
  94   CmdArgs.push_back("-m");
  95   switch (TC.getArch()) {
  96   default:
  97     llvm_unreachable("unsupported architecture");
  98   case llvm::Triple::arm:
  99   case llvm::Triple::thumb:
 100     // FIXME: this is incorrect for WinCE
 101     CmdArgs.push_back("thumb2pe");
 102     break;
 103   case llvm::Triple::aarch64:
 104     CmdArgs.push_back("arm64pe");
 105     break;
 106   case llvm::Triple::x86:
 107     CmdArgs.push_back("i386pe");
 108     EntryPoint.append("_");
 109     break;
 110   case llvm::Triple::x86_64:
 111     CmdArgs.push_back("i386pep");
 112     break;
 113   }
 114
 115   if (Args.hasArg(options::OPT_shared)) {
 116     switch (T.getArch()) {
 117     default:
 118       llvm_unreachable("unsupported architecture");
 119     case llvm::Triple::aarch64:
 120     case llvm::Triple::arm:
 121     case llvm::Triple::thumb:
 122     case llvm::Triple::x86_64:
 123       EntryPoint.append("_DllMainCRTStartup");
 124       break;
 125     case llvm::Triple::x86:
 126       EntryPoint.append("_DllMainCRTStartup@12");
 127       break;
 128     }
 129
 130     CmdArgs.push_back("-shared");
 131     CmdArgs.push_back(Args.hasArg(options::OPT_static) ? "-Bstatic"
 132                                                        : "-Bdynamic");
 133
 134     CmdArgs.push_back("--enable-auto-image-base");
 135
 136     CmdArgs.push_back("--entry");
 137     CmdArgs.push_back(Args.MakeArgString(EntryPoint));
 138   } else {
 139     EntryPoint.append("mainCRTStartup");
 140
 141     CmdArgs.push_back(Args.hasArg(options::OPT_static) ? "-Bstatic"
 142                                                        : "-Bdynamic");
 143
 144     if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
 145       CmdArgs.push_back("--entry");
 146       CmdArgs.push_back(Args.MakeArgString(EntryPoint));
 147     }
 148
 149     // FIXME: handle subsystem
 150   }
 151
 152   // NOTE: deal with multiple definitions on Windows (e.g. COMDAT)
 153   CmdArgs.push_back("--allow-multiple-definition");
 154
 155   CmdArgs.push_back("-o");
 156   CmdArgs.push_back(Output.getFilename());
 157
 158   if (Args.hasArg(options::OPT_shared) || Args.hasArg(options::OPT_rdynamic)) {
 159     SmallString<261> ImpLib(Output.getFilename());
 160     llvm::sys::path::replace_extension(ImpLib, ".lib");
 161
 162     CmdArgs.push_back("--out-implib");
 163     CmdArgs.push_back(Args.MakeArgString(ImpLib));
 164   }
 165
 166   Args.AddAllArgs(CmdArgs, options::OPT_L);
 167   TC.AddFilePathLibArgs(Args, CmdArgs);
 168   AddLinkerInputs(TC, Inputs, Args, CmdArgs, JA);
 169
 170   if (TC.ShouldLinkCXXStdlib(Args)) {
 171     bool StaticCXX = Args.hasArg(options::OPT_static_libstdcxx) &&
 172                      !Args.hasArg(options::OPT_static);
 173     if (StaticCXX)
 174       CmdArgs.push_back("-Bstatic");
 175     TC.AddCXXStdlibLibArgs(Args, CmdArgs);
 176     if (StaticCXX)
 177       CmdArgs.push_back("-Bdynamic");
 178   }
 179
 180   if (!Args.hasArg(options::OPT_nostdlib)) {
 181     if (!Args.hasArg(options::OPT_nodefaultlibs)) {
 182       // TODO handle /MT[d] /MD[d]
 183       CmdArgs.push_back("-lmsvcrt");
 184       AddRunTimeLibs(TC, D, CmdArgs, Args);
 185     }
 186   }
 187
 188   if (TC.getSanitizerArgs(Args).needsAsanRt()) {
 189     // TODO handle /MT[d] /MD[d]
 190     if (Args.hasArg(options::OPT_shared)) {
 191       CmdArgs.push_back(TC.getCompilerRTArgString(Args, "asan_dll_thunk"));
 192     } else {
 193       for (const auto &Lib : {"asan_dynamic", "asan_dynamic_runtime_thunk"})
 194         CmdArgs.push_back(TC.getCompilerRTArgString(Args, Lib));
 195       // Make sure the dynamic runtime thunk is not optimized out at link time
 196       // to ensure proper SEH handling.
 197       CmdArgs.push_back(Args.MakeArgString("--undefined"));
 198       CmdArgs.push_back(Args.MakeArgString(TC.getArch() == llvm::Triple::x86
 199                                                ? "___asan_seh_interceptor"
 200                                                : "__asan_seh_interceptor"));
 201     }
 202   }
 203
 204   Exec = Args.MakeArgString(TC.GetLinkerPath());
 205
 206   C.addCommand(std::make_unique<Command>(JA, *this,
 207                                          ResponseFileSupport::AtFileUTF8(),
 208                                          Exec, CmdArgs, Inputs, Output));
 209 }
 210
 211 CrossWindowsToolChain::CrossWindowsToolChain(const Driver &D,
 212                                              const llvm::Triple &T,
 213                                              const llvm::opt::ArgList &Args)
 214     : Generic_GCC(D, T, Args) {}
 215
 216 bool CrossWindowsToolChain::IsUnwindTablesDefault(const ArgList &Args) const {
 217   // FIXME: all non-x86 targets need unwind tables, however, LLVM currently does
 218   // not know how to emit them.
 219   return getArch() == llvm::Triple::x86_64;
 220 }
 221
 222 bool CrossWindowsToolChain::isPICDefault() const {
 223   return getArch() == llvm::Triple::x86_64;
 224 }
 225
 226 bool CrossWindowsToolChain::isPIEDefault(const llvm::opt::ArgList &Args) const {
 227   return getArch() == llvm::Triple::x86_64;
 228 }
 229
 230 bool CrossWindowsToolChain::isPICDefaultForced() const {
 231   return getArch() == llvm::Triple::x86_64;
 232 }
 233
 234 void CrossWindowsToolChain::
 235 AddClangSystemIncludeArgs(const llvm::opt::ArgList &DriverArgs,
 236                           llvm::opt::ArgStringList &CC1Args) const {
 237   const Driver &D = getDriver();
 238   const std::string &SysRoot = D.SysRoot;
 239
 240   auto AddSystemAfterIncludes = [&]() {
 241     for (const auto &P : DriverArgs.getAllArgValues(options::OPT_isystem_after))
 242       addSystemInclude(DriverArgs, CC1Args, P);
 243   };
 244
 245   if (DriverArgs.hasArg(options::OPT_nostdinc)) {
 246     AddSystemAfterIncludes();
 247     return;
 248   }
 249
 250   addSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/local/include");
 251   if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
 252     SmallString<128> ResourceDir(D.ResourceDir);
 253     llvm::sys::path::append(ResourceDir, "include");
 254     addSystemInclude(DriverArgs, CC1Args, ResourceDir);
 255   }
 256   AddSystemAfterIncludes();
 257   addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/include");
 258 }
 259
 260 void CrossWindowsToolChain::
 261 AddClangCXXStdlibIncludeArgs(const llvm::opt::ArgList &DriverArgs,
 262                              llvm::opt::ArgStringList &CC1Args) const {
 263   const std::string &SysRoot = getDriver().SysRoot;
 264
 265   if (DriverArgs.hasArg(options::OPT_nostdinc) ||
 266       DriverArgs.hasArg(options::OPT_nostdincxx))
 267     return;
 268
 269   if (GetCXXStdlibType(DriverArgs) == ToolChain::CST_Libcxx)
 270     addSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/include/c++/v1");
 271 }
 272
 273 void CrossWindowsToolChain::
 274 AddCXXStdlibLibArgs(const llvm::opt::ArgList &Args,
 275                     llvm::opt::ArgStringList &CmdArgs) const {
 276   if (GetCXXStdlibType(Args) == ToolChain::CST_Libcxx) {
 277     CmdArgs.push_back("-lc++");
 278     if (Args.hasArg(options::OPT_fexperimental_library))
 279       CmdArgs.push_back("-lc++experimental");
 280   }
 281 }
 282
 283 clang::SanitizerMask CrossWindowsToolChain::getSupportedSanitizers() const {
 284   SanitizerMask Res = ToolChain::getSupportedSanitizers();
 285   Res |= SanitizerKind::Address;
 286   Res |= SanitizerKind::PointerCompare;
 287   Res |= SanitizerKind::PointerSubtract;
 288   return Res;
 289 }
 290
 291 Tool *CrossWindowsToolChain::buildLinker() const {
 292   return new tools::CrossWindows::Linker(*this);
 293 }
 294
 295 Tool *CrossWindowsToolChain::buildAssembler() const {
 296   return new tools::CrossWindows::Assembler(*this);
 297 }