contrib/llvm/tools/clang/lib/Driver/ToolChains/WebAssembly.cpp

   1 //===--- WebAssembly.cpp - WebAssembly ToolChain Implementation -*- 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 "WebAssembly.h"
  11 #include "CommonArgs.h"
  12 #include "clang/Driver/Compilation.h"
  13 #include "clang/Driver/Driver.h"
  14 #include "clang/Driver/Options.h"
  15 #include "llvm/Option/ArgList.h"
  16
  17 using namespace clang::driver;
  18 using namespace clang::driver::tools;
  19 using namespace clang::driver::toolchains;
  20 using namespace clang;
  21 using namespace llvm::opt;
  22
  23 wasm::Linker::Linker(const ToolChain &TC)
  24   : GnuTool("wasm::Linker", "lld", TC) {}
  25
  26 bool wasm::Linker::isLinkJob() const {
  27   return true;
  28 }
  29
  30 bool wasm::Linker::hasIntegratedCPP() const {
  31   return false;
  32 }
  33
  34 void wasm::Linker::ConstructJob(Compilation &C, const JobAction &JA,
  35                                 const InputInfo &Output,
  36                                 const InputInfoList &Inputs,
  37                                 const ArgList &Args,
  38                                 const char *LinkingOutput) const {
  39
  40   const ToolChain &ToolChain = getToolChain();
  41   const Driver &D = ToolChain.getDriver();
  42   const char *Linker = Args.MakeArgString(ToolChain.GetLinkerPath());
  43   ArgStringList CmdArgs;
  44   CmdArgs.push_back("-flavor");
  45   CmdArgs.push_back("wasm");
  46
  47   // Enable garbage collection of unused input sections by default, since code
  48   // size is of particular importance. This is significantly facilitated by
  49   // the enabling of -ffunction-sections and -fdata-sections in
  50   // Clang::ConstructJob.
  51   if (areOptimizationsEnabled(Args))
  52     CmdArgs.push_back("--gc-sections");
  53
  54   if (Args.hasArg(options::OPT_rdynamic))
  55     CmdArgs.push_back("-export-dynamic");
  56   if (Args.hasArg(options::OPT_s))
  57     CmdArgs.push_back("--strip-all");
  58   if (Args.hasArg(options::OPT_shared))
  59     CmdArgs.push_back("-shared");
  60   if (Args.hasArg(options::OPT_static))
  61     CmdArgs.push_back("-Bstatic");
  62
  63   Args.AddAllArgs(CmdArgs, options::OPT_L);
  64   ToolChain.AddFilePathLibArgs(Args, CmdArgs);
  65
  66   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
  67     if (Args.hasArg(options::OPT_shared))
  68       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("rcrt1.o")));
  69     else if (Args.hasArg(options::OPT_pie))
  70       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("Scrt1.o")));
  71     else
  72       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crt1.o")));
  73
  74     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crti.o")));
  75   }
  76
  77   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
  78
  79   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
  80     if (D.CCCIsCXX())
  81       ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
  82
  83     if (Args.hasArg(options::OPT_pthread))
  84       CmdArgs.push_back("-lpthread");
  85
  86     CmdArgs.push_back("-allow-undefined-file");
  87     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("wasm.syms")));
  88     CmdArgs.push_back("-lc");
  89     CmdArgs.push_back("-lcompiler_rt");
  90   }
  91
  92   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles))
  93     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtn.o")));
  94
  95   CmdArgs.push_back("-o");
  96   CmdArgs.push_back(Output.getFilename());
  97
  98   C.addCommand(llvm::make_unique<Command>(JA, *this, Linker, CmdArgs, Inputs));
  99 }
 100
 101 WebAssembly::WebAssembly(const Driver &D, const llvm::Triple &Triple,
 102                          const llvm::opt::ArgList &Args)
 103   : ToolChain(D, Triple, Args) {
 104
 105   assert(Triple.isArch32Bit() != Triple.isArch64Bit());
 106
 107   getProgramPaths().push_back(getDriver().getInstalledDir());
 108
 109   getFilePaths().push_back(getDriver().SysRoot + "/lib");
 110 }
 111
 112 bool WebAssembly::IsMathErrnoDefault() const { return false; }
 113
 114 bool WebAssembly::IsObjCNonFragileABIDefault() const { return true; }
 115
 116 bool WebAssembly::UseObjCMixedDispatch() const { return true; }
 117
 118 bool WebAssembly::isPICDefault() const { return false; }
 119
 120 bool WebAssembly::isPIEDefault() const { return false; }
 121
 122 bool WebAssembly::isPICDefaultForced() const { return false; }
 123
 124 bool WebAssembly::IsIntegratedAssemblerDefault() const { return true; }
 125
 126 // TODO: Support Objective C stuff.
 127 bool WebAssembly::SupportsObjCGC() const { return false; }
 128
 129 bool WebAssembly::hasBlocksRuntime() const { return false; }
 130
 131 // TODO: Support profiling.
 132 bool WebAssembly::SupportsProfiling() const { return false; }
 133
 134 bool WebAssembly::HasNativeLLVMSupport() const { return true; }
 135
 136 void WebAssembly::addClangTargetOptions(const ArgList &DriverArgs,
 137                                         ArgStringList &CC1Args,
 138                                         Action::OffloadKind) const {
 139   if (DriverArgs.hasFlag(clang::driver::options::OPT_fuse_init_array,
 140                          options::OPT_fno_use_init_array, true))
 141     CC1Args.push_back("-fuse-init-array");
 142 }
 143
 144 ToolChain::RuntimeLibType WebAssembly::GetDefaultRuntimeLibType() const {
 145   return ToolChain::RLT_CompilerRT;
 146 }
 147
 148 ToolChain::CXXStdlibType WebAssembly::GetCXXStdlibType(const ArgList &Args) const {
 149   return ToolChain::CST_Libcxx;
 150 }
 151
 152 void WebAssembly::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
 153                                             ArgStringList &CC1Args) const {
 154   if (!DriverArgs.hasArg(options::OPT_nostdinc))
 155     addSystemInclude(DriverArgs, CC1Args, getDriver().SysRoot + "/include");
 156 }
 157
 158 void WebAssembly::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
 159                                                ArgStringList &CC1Args) const {
 160   if (!DriverArgs.hasArg(options::OPT_nostdlibinc) &&
 161       !DriverArgs.hasArg(options::OPT_nostdincxx))
 162     addSystemInclude(DriverArgs, CC1Args,
 163                      getDriver().SysRoot + "/include/c++/v1");
 164 }
 165
 166 Tool *WebAssembly::buildLinker() const {
 167   return new tools::wasm::Linker(*this);
 168 }