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/DriverDiagnostic.h"
15 #include "clang/Driver/Options.h"
16 #include "llvm/Option/ArgList.h"
18 using namespace clang::driver;
19 using namespace clang::driver::tools;
20 using namespace clang::driver::toolchains;
21 using namespace clang;
22 using namespace llvm::opt;
24 wasm::Linker::Linker(const ToolChain &TC)
25 : GnuTool("wasm::Linker", "lld", TC) {}
27 bool wasm::Linker::isLinkJob() const {
31 bool wasm::Linker::hasIntegratedCPP() const {
35 void wasm::Linker::ConstructJob(Compilation &C, const JobAction &JA,
36 const InputInfo &Output,
37 const InputInfoList &Inputs,
39 const char *LinkingOutput) const {
41 const ToolChain &ToolChain = getToolChain();
42 const char *Linker = Args.MakeArgString(ToolChain.GetLinkerPath());
43 ArgStringList CmdArgs;
44 CmdArgs.push_back("-flavor");
45 CmdArgs.push_back("wasm");
47 if (Args.hasArg(options::OPT_s))
48 CmdArgs.push_back("--strip-all");
50 Args.AddAllArgs(CmdArgs, options::OPT_L);
51 Args.AddAllArgs(CmdArgs, options::OPT_u);
52 ToolChain.AddFilePathLibArgs(Args, CmdArgs);
54 if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles))
55 CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crt1.o")));
57 AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
59 if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
60 if (ToolChain.ShouldLinkCXXStdlib(Args))
61 ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
63 if (Args.hasArg(options::OPT_pthread))
64 CmdArgs.push_back("-lpthread");
66 CmdArgs.push_back("-lc");
67 AddRunTimeLibs(ToolChain, ToolChain.getDriver(), CmdArgs, Args);
70 CmdArgs.push_back("-o");
71 CmdArgs.push_back(Output.getFilename());
73 C.addCommand(llvm::make_unique<Command>(JA, *this, Linker, CmdArgs, Inputs));
76 WebAssembly::WebAssembly(const Driver &D, const llvm::Triple &Triple,
77 const llvm::opt::ArgList &Args)
78 : ToolChain(D, Triple, Args) {
80 assert(Triple.isArch32Bit() != Triple.isArch64Bit());
82 getProgramPaths().push_back(getDriver().getInstalledDir());
84 getFilePaths().push_back(getDriver().SysRoot + "/lib");
87 bool WebAssembly::IsMathErrnoDefault() const { return false; }
89 bool WebAssembly::IsObjCNonFragileABIDefault() const { return true; }
91 bool WebAssembly::UseObjCMixedDispatch() const { return true; }
93 bool WebAssembly::isPICDefault() const { return false; }
95 bool WebAssembly::isPIEDefault() const { return false; }
97 bool WebAssembly::isPICDefaultForced() const { return false; }
99 bool WebAssembly::IsIntegratedAssemblerDefault() const { return true; }
101 bool WebAssembly::hasBlocksRuntime() const { return false; }
103 // TODO: Support profiling.
104 bool WebAssembly::SupportsProfiling() const { return false; }
106 bool WebAssembly::HasNativeLLVMSupport() const { return true; }
108 void WebAssembly::addClangTargetOptions(const ArgList &DriverArgs,
109 ArgStringList &CC1Args,
110 Action::OffloadKind) const {
111 if (DriverArgs.hasFlag(clang::driver::options::OPT_fuse_init_array,
112 options::OPT_fno_use_init_array, true))
113 CC1Args.push_back("-fuse-init-array");
116 ToolChain::RuntimeLibType WebAssembly::GetDefaultRuntimeLibType() const {
117 return ToolChain::RLT_CompilerRT;
120 ToolChain::CXXStdlibType WebAssembly::GetCXXStdlibType(const ArgList &Args) const {
121 if (Arg *A = Args.getLastArg(options::OPT_stdlib_EQ)) {
122 StringRef Value = A->getValue();
123 if (Value != "libc++")
124 getDriver().Diag(diag::err_drv_invalid_stdlib_name)
125 << A->getAsString(Args);
127 return ToolChain::CST_Libcxx;
130 void WebAssembly::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
131 ArgStringList &CC1Args) const {
132 if (!DriverArgs.hasArg(options::OPT_nostdinc))
133 addSystemInclude(DriverArgs, CC1Args, getDriver().SysRoot + "/include");
136 void WebAssembly::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
137 ArgStringList &CC1Args) const {
138 if (!DriverArgs.hasArg(options::OPT_nostdlibinc) &&
139 !DriverArgs.hasArg(options::OPT_nostdincxx))
140 addSystemInclude(DriverArgs, CC1Args,
141 getDriver().SysRoot + "/include/c++/v1");
144 void WebAssembly::AddCXXStdlibLibArgs(const llvm::opt::ArgList &Args,
145 llvm::opt::ArgStringList &CmdArgs) const {
147 switch (GetCXXStdlibType(Args)) {
148 case ToolChain::CST_Libcxx:
149 CmdArgs.push_back("-lc++");
150 CmdArgs.push_back("-lc++abi");
152 case ToolChain::CST_Libstdcxx:
153 llvm_unreachable("invalid stdlib name");
157 std::string WebAssembly::getThreadModel() const {
158 // The WebAssembly MVP does not yet support threads; for now, use the
159 // "single" threading model, which lowers atomics to non-atomic operations.
160 // When threading support is standardized and implemented in popular engines,
161 // this override should be removed.
165 Tool *WebAssembly::buildLinker() const {
166 return new tools::wasm::Linker(*this);