1 //===--- WebAssembly.cpp - WebAssembly ToolChain Implementation -*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
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"
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;
23 wasm::Linker::Linker(const ToolChain &TC)
24 : GnuTool("wasm::Linker", "lld", TC) {}
26 bool wasm::Linker::isLinkJob() const {
30 bool wasm::Linker::hasIntegratedCPP() const {
34 void wasm::Linker::ConstructJob(Compilation &C, const JobAction &JA,
35 const InputInfo &Output,
36 const InputInfoList &Inputs,
38 const char *LinkingOutput) const {
40 const ToolChain &ToolChain = getToolChain();
41 const char *Linker = Args.MakeArgString(ToolChain.GetLinkerPath());
42 ArgStringList CmdArgs;
43 CmdArgs.push_back("-flavor");
44 CmdArgs.push_back("wasm");
46 if (Args.hasArg(options::OPT_s))
47 CmdArgs.push_back("--strip-all");
49 Args.AddAllArgs(CmdArgs, options::OPT_L);
50 Args.AddAllArgs(CmdArgs, options::OPT_u);
51 ToolChain.AddFilePathLibArgs(Args, CmdArgs);
53 if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles))
54 CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crt1.o")));
56 AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
58 if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
59 if (ToolChain.ShouldLinkCXXStdlib(Args))
60 ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
62 if (Args.hasArg(options::OPT_pthread))
63 CmdArgs.push_back("-lpthread");
65 CmdArgs.push_back("-allow-undefined-file");
66 CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("wasm.syms")));
67 CmdArgs.push_back("-lc");
68 AddRunTimeLibs(ToolChain, ToolChain.getDriver(), CmdArgs, Args);
71 CmdArgs.push_back("-o");
72 CmdArgs.push_back(Output.getFilename());
74 C.addCommand(llvm::make_unique<Command>(JA, *this, Linker, CmdArgs, Inputs));
77 WebAssembly::WebAssembly(const Driver &D, const llvm::Triple &Triple,
78 const llvm::opt::ArgList &Args)
79 : ToolChain(D, Triple, Args) {
81 assert(Triple.isArch32Bit() != Triple.isArch64Bit());
83 getProgramPaths().push_back(getDriver().getInstalledDir());
85 getFilePaths().push_back(getDriver().SysRoot + "/lib");
88 bool WebAssembly::IsMathErrnoDefault() const { return false; }
90 bool WebAssembly::IsObjCNonFragileABIDefault() const { return true; }
92 bool WebAssembly::UseObjCMixedDispatch() const { return true; }
94 bool WebAssembly::isPICDefault() const { return false; }
96 bool WebAssembly::isPIEDefault() const { return false; }
98 bool WebAssembly::isPICDefaultForced() const { return false; }
100 bool WebAssembly::IsIntegratedAssemblerDefault() const { return true; }
102 bool WebAssembly::hasBlocksRuntime() const { return false; }
104 // TODO: Support profiling.
105 bool WebAssembly::SupportsProfiling() const { return false; }
107 bool WebAssembly::HasNativeLLVMSupport() const { return true; }
109 void WebAssembly::addClangTargetOptions(const ArgList &DriverArgs,
110 ArgStringList &CC1Args,
111 Action::OffloadKind) const {
112 if (DriverArgs.hasFlag(clang::driver::options::OPT_fuse_init_array,
113 options::OPT_fno_use_init_array, true))
114 CC1Args.push_back("-fuse-init-array");
117 ToolChain::RuntimeLibType WebAssembly::GetDefaultRuntimeLibType() const {
118 return ToolChain::RLT_CompilerRT;
121 ToolChain::CXXStdlibType WebAssembly::GetCXXStdlibType(const ArgList &Args) const {
122 return ToolChain::CST_Libcxx;
125 void WebAssembly::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
126 ArgStringList &CC1Args) const {
127 if (!DriverArgs.hasArg(options::OPT_nostdinc))
128 addSystemInclude(DriverArgs, CC1Args, getDriver().SysRoot + "/include");
131 void WebAssembly::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
132 ArgStringList &CC1Args) const {
133 if (!DriverArgs.hasArg(options::OPT_nostdlibinc) &&
134 !DriverArgs.hasArg(options::OPT_nostdincxx))
135 addSystemInclude(DriverArgs, CC1Args,
136 getDriver().SysRoot + "/include/c++/v1");
139 std::string WebAssembly::getThreadModel() const {
140 // The WebAssembly MVP does not yet support threads; for now, use the
141 // "single" threading model, which lowers atomics to non-atomic operations.
142 // When threading support is standardized and implemented in popular engines,
143 // this override should be removed.
147 Tool *WebAssembly::buildLinker() const {
148 return new tools::wasm::Linker(*this);