clang/lib/Driver/ToolChains/CloudABI.cpp

   1 //===--- CloudABI.cpp - CloudABI ToolChain Implementations ------*- C++ -*-===//
   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 "CloudABI.h"
  10 #include "CommonArgs.h"
  11 #include "clang/Driver/Compilation.h"
  12 #include "clang/Driver/Driver.h"
  13 #include "clang/Driver/InputInfo.h"
  14 #include "clang/Driver/Options.h"
  15 #include "llvm/ADT/SmallString.h"
  16 #include "llvm/Option/ArgList.h"
  17 #include "llvm/Support/Path.h"
  18
  19 using namespace clang::driver;
  20 using namespace clang::driver::tools;
  21 using namespace clang::driver::toolchains;
  22 using namespace clang;
  23 using namespace llvm::opt;
  24
  25 void cloudabi::Linker::ConstructJob(Compilation &C, const JobAction &JA,
  26                                     const InputInfo &Output,
  27                                     const InputInfoList &Inputs,
  28                                     const ArgList &Args,
  29                                     const char *LinkingOutput) const {
  30   const ToolChain &ToolChain = getToolChain();
  31   const Driver &D = ToolChain.getDriver();
  32   ArgStringList CmdArgs;
  33
  34   // Silence warning for "clang -g foo.o -o foo"
  35   Args.ClaimAllArgs(options::OPT_g_Group);
  36   // and "clang -emit-llvm foo.o -o foo"
  37   Args.ClaimAllArgs(options::OPT_emit_llvm);
  38   // and for "clang -w foo.o -o foo". Other warning options are already
  39   // handled somewhere else.
  40   Args.ClaimAllArgs(options::OPT_w);
  41
  42   if (!D.SysRoot.empty())
  43     CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
  44
  45   // CloudABI only supports static linkage.
  46   CmdArgs.push_back("-Bstatic");
  47   CmdArgs.push_back("--no-dynamic-linker");
  48
  49   // Provide PIE linker flags in case PIE is default for the architecture.
  50   if (ToolChain.isPIEDefault(Args)) {
  51     CmdArgs.push_back("-pie");
  52     CmdArgs.push_back("-zrelro");
  53   }
  54
  55   CmdArgs.push_back("--eh-frame-hdr");
  56   CmdArgs.push_back("--gc-sections");
  57
  58   if (Output.isFilename()) {
  59     CmdArgs.push_back("-o");
  60     CmdArgs.push_back(Output.getFilename());
  61   } else {
  62     assert(Output.isNothing() && "Invalid output.");
  63   }
  64
  65   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
  66     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crt0.o")));
  67     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtbegin.o")));
  68   }
  69
  70   Args.AddAllArgs(CmdArgs, options::OPT_L);
  71   ToolChain.AddFilePathLibArgs(Args, CmdArgs);
  72   Args.AddAllArgs(CmdArgs,
  73                   {options::OPT_T_Group, options::OPT_e, options::OPT_s,
  74                    options::OPT_t, options::OPT_Z_Flag, options::OPT_r});
  75
  76   if (D.isUsingLTO()) {
  77     assert(!Inputs.empty() && "Must have at least one input.");
  78     addLTOOptions(ToolChain, Args, CmdArgs, Output, Inputs[0],
  79                   D.getLTOMode() == LTOK_Thin);
  80   }
  81
  82   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
  83
  84   if (ToolChain.ShouldLinkCXXStdlib(Args))
  85     ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
  86   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
  87     CmdArgs.push_back("-lc");
  88     CmdArgs.push_back("-lcompiler_rt");
  89   }
  90
  91   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles))
  92     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtend.o")));
  93
  94   const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
  95   C.addCommand(std::make_unique<Command>(JA, *this,
  96                                          ResponseFileSupport::AtFileCurCP(),
  97                                          Exec, CmdArgs, Inputs, Output));
  98 }
  99
 100 // CloudABI - CloudABI tool chain which can call ld(1) directly.
 101
 102 CloudABI::CloudABI(const Driver &D, const llvm::Triple &Triple,
 103                    const ArgList &Args)
 104     : Generic_ELF(D, Triple, Args) {
 105   SmallString<128> P(getDriver().Dir);
 106   llvm::sys::path::append(P, "..", getTriple().str(), "lib");
 107   getFilePaths().push_back(std::string(P.str()));
 108 }
 109
 110 void CloudABI::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
 111                                      llvm::opt::ArgStringList &CC1Args) const {
 112   SmallString<128> P(getDriver().Dir);
 113   llvm::sys::path::append(P, "..", getTriple().str(), "include/c++/v1");
 114   addSystemInclude(DriverArgs, CC1Args, P.str());
 115 }
 116
 117 void CloudABI::AddCXXStdlibLibArgs(const ArgList &Args,
 118                                    ArgStringList &CmdArgs) const {
 119   CmdArgs.push_back("-lc++");
 120   if (Args.hasArg(options::OPT_fexperimental_library))
 121     CmdArgs.push_back("-lc++experimental");
 122   CmdArgs.push_back("-lc++abi");
 123   CmdArgs.push_back("-lunwind");
 124 }
 125
 126 Tool *CloudABI::buildLinker() const {
 127   return new tools::cloudabi::Linker(*this);
 128 }
 129
 130 bool CloudABI::isPIEDefault(const llvm::opt::ArgList &Args) const {
 131   // Only enable PIE on architectures that support PC-relative
 132   // addressing. PC-relative addressing is required, as the process
 133   // startup code must be able to relocate itself.
 134   switch (getTriple().getArch()) {
 135   case llvm::Triple::aarch64:
 136   case llvm::Triple::x86_64:
 137     return true;
 138   default:
 139     return false;
 140   }
 141 }
 142
 143 SanitizerMask CloudABI::getSupportedSanitizers() const {
 144   SanitizerMask Res = ToolChain::getSupportedSanitizers();
 145   Res |= SanitizerKind::SafeStack;
 146   return Res;
 147 }
 148
 149 SanitizerMask CloudABI::getDefaultSanitizers() const {
 150   return SanitizerKind::SafeStack;
 151 }