389 lines
14 KiB
C++
389 lines
14 KiB
C++
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//===--- WebAssembly.cpp - WebAssembly ToolChain Implementation -*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "WebAssembly.h"
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#include "CommonArgs.h"
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#include "clang/Basic/Version.h"
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#include "clang/Config/config.h"
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#include "clang/Driver/Compilation.h"
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#include "clang/Driver/Driver.h"
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#include "clang/Driver/DriverDiagnostic.h"
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#include "clang/Driver/Options.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Option/ArgList.h"
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using namespace clang::driver;
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using namespace clang::driver::tools;
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using namespace clang::driver::toolchains;
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using namespace clang;
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using namespace llvm::opt;
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/// Following the conventions in https://wiki.debian.org/Multiarch/Tuples,
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/// we remove the vendor field to form the multiarch triple.
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static std::string getMultiarchTriple(const Driver &D,
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const llvm::Triple &TargetTriple,
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StringRef SysRoot) {
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return (TargetTriple.getArchName() + "-" +
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TargetTriple.getOSAndEnvironmentName()).str();
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}
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std::string wasm::Linker::getLinkerPath(const ArgList &Args) const {
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const ToolChain &ToolChain = getToolChain();
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if (const Arg* A = Args.getLastArg(options::OPT_fuse_ld_EQ)) {
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StringRef UseLinker = A->getValue();
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if (!UseLinker.empty()) {
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if (llvm::sys::path::is_absolute(UseLinker) &&
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llvm::sys::fs::can_execute(UseLinker))
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return std::string(UseLinker);
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// Accept 'lld', and 'ld' as aliases for the default linker
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if (UseLinker != "lld" && UseLinker != "ld")
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ToolChain.getDriver().Diag(diag::err_drv_invalid_linker_name)
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<< A->getAsString(Args);
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}
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}
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return ToolChain.GetProgramPath(ToolChain.getDefaultLinker());
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}
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void wasm::Linker::ConstructJob(Compilation &C, const JobAction &JA,
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const InputInfo &Output,
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const InputInfoList &Inputs,
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const ArgList &Args,
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const char *LinkingOutput) const {
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const ToolChain &ToolChain = getToolChain();
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const char *Linker = Args.MakeArgString(getLinkerPath(Args));
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ArgStringList CmdArgs;
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CmdArgs.push_back("-m");
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if (getToolChain().getTriple().isArch64Bit())
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CmdArgs.push_back("wasm64");
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else
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CmdArgs.push_back("wasm32");
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if (Args.hasArg(options::OPT_s))
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CmdArgs.push_back("--strip-all");
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Args.AddAllArgs(CmdArgs, options::OPT_L);
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Args.AddAllArgs(CmdArgs, options::OPT_u);
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ToolChain.AddFilePathLibArgs(Args, CmdArgs);
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const char *Crt1 = "crt1.o";
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const char *Entry = NULL;
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if (const Arg *A = Args.getLastArg(options::OPT_mexec_model_EQ)) {
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StringRef CM = A->getValue();
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if (CM == "command") {
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// Use default values.
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} else if (CM == "reactor") {
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Crt1 = "crt1-reactor.o";
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Entry = "_initialize";
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} else {
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ToolChain.getDriver().Diag(diag::err_drv_invalid_argument_to_option)
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<< CM << A->getOption().getName();
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}
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}
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if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles))
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CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(Crt1)));
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if (Entry) {
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CmdArgs.push_back(Args.MakeArgString("--entry"));
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CmdArgs.push_back(Args.MakeArgString(Entry));
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}
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AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
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if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
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if (ToolChain.ShouldLinkCXXStdlib(Args))
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ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
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if (Args.hasArg(options::OPT_pthread)) {
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CmdArgs.push_back("-lpthread");
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CmdArgs.push_back("--shared-memory");
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}
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CmdArgs.push_back("-lc");
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AddRunTimeLibs(ToolChain, ToolChain.getDriver(), CmdArgs, Args);
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}
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CmdArgs.push_back("-o");
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CmdArgs.push_back(Output.getFilename());
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C.addCommand(std::make_unique<Command>(JA, *this,
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ResponseFileSupport::AtFileCurCP(),
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Linker, CmdArgs, Inputs, Output));
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// When optimizing, if wasm-opt is available, run it.
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if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
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auto WasmOptPath = getToolChain().GetProgramPath("wasm-opt");
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if (WasmOptPath != "wasm-opt") {
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StringRef OOpt = "s";
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if (A->getOption().matches(options::OPT_O4) ||
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A->getOption().matches(options::OPT_Ofast))
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OOpt = "4";
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else if (A->getOption().matches(options::OPT_O0))
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OOpt = "0";
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else if (A->getOption().matches(options::OPT_O))
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OOpt = A->getValue();
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if (OOpt != "0") {
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const char *WasmOpt = Args.MakeArgString(WasmOptPath);
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ArgStringList CmdArgs;
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CmdArgs.push_back(Output.getFilename());
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CmdArgs.push_back(Args.MakeArgString(llvm::Twine("-O") + OOpt));
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CmdArgs.push_back("-o");
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CmdArgs.push_back(Output.getFilename());
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C.addCommand(std::make_unique<Command>(
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JA, *this, ResponseFileSupport::AtFileCurCP(), WasmOpt, CmdArgs,
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Inputs, Output));
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}
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}
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}
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}
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/// Given a base library directory, append path components to form the
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/// LTO directory.
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static std::string AppendLTOLibDir(const std::string &Dir) {
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// The version allows the path to be keyed to the specific version of
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// LLVM in used, as the bitcode format is not stable.
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return Dir + "/llvm-lto/" LLVM_VERSION_STRING;
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}
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WebAssembly::WebAssembly(const Driver &D, const llvm::Triple &Triple,
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const llvm::opt::ArgList &Args)
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: ToolChain(D, Triple, Args) {
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assert(Triple.isArch32Bit() != Triple.isArch64Bit());
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getProgramPaths().push_back(getDriver().getInstalledDir());
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auto SysRoot = getDriver().SysRoot;
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if (getTriple().getOS() == llvm::Triple::UnknownOS) {
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// Theoretically an "unknown" OS should mean no standard libraries, however
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// it could also mean that a custom set of libraries is in use, so just add
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// /lib to the search path. Disable multiarch in this case, to discourage
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// paths containing "unknown" from acquiring meanings.
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getFilePaths().push_back(SysRoot + "/lib");
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} else {
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const std::string MultiarchTriple =
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getMultiarchTriple(getDriver(), Triple, SysRoot);
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if (D.isUsingLTO()) {
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// For LTO, enable use of lto-enabled sysroot libraries too, if available.
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// Note that the directory is keyed to the LLVM revision, as LLVM's
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// bitcode format is not stable.
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auto Dir = AppendLTOLibDir(SysRoot + "/lib/" + MultiarchTriple);
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getFilePaths().push_back(Dir);
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}
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getFilePaths().push_back(SysRoot + "/lib/" + MultiarchTriple);
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}
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}
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bool WebAssembly::IsMathErrnoDefault() const { return false; }
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bool WebAssembly::IsObjCNonFragileABIDefault() const { return true; }
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bool WebAssembly::UseObjCMixedDispatch() const { return true; }
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bool WebAssembly::isPICDefault() const { return false; }
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bool WebAssembly::isPIEDefault() const { return false; }
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bool WebAssembly::isPICDefaultForced() const { return false; }
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bool WebAssembly::IsIntegratedAssemblerDefault() const { return true; }
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bool WebAssembly::hasBlocksRuntime() const { return false; }
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// TODO: Support profiling.
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bool WebAssembly::SupportsProfiling() const { return false; }
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bool WebAssembly::HasNativeLLVMSupport() const { return true; }
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void WebAssembly::addClangTargetOptions(const ArgList &DriverArgs,
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ArgStringList &CC1Args,
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Action::OffloadKind) const {
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if (!DriverArgs.hasFlag(clang::driver::options::OPT_fuse_init_array,
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options::OPT_fno_use_init_array, true))
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CC1Args.push_back("-fno-use-init-array");
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// '-pthread' implies atomics, bulk-memory, mutable-globals, and sign-ext
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if (DriverArgs.hasFlag(options::OPT_pthread, options::OPT_no_pthread,
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false)) {
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if (DriverArgs.hasFlag(options::OPT_mno_atomics, options::OPT_matomics,
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false))
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getDriver().Diag(diag::err_drv_argument_not_allowed_with)
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<< "-pthread"
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<< "-mno-atomics";
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if (DriverArgs.hasFlag(options::OPT_mno_bulk_memory,
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options::OPT_mbulk_memory, false))
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getDriver().Diag(diag::err_drv_argument_not_allowed_with)
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<< "-pthread"
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<< "-mno-bulk-memory";
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if (DriverArgs.hasFlag(options::OPT_mno_mutable_globals,
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options::OPT_mmutable_globals, false))
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getDriver().Diag(diag::err_drv_argument_not_allowed_with)
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<< "-pthread"
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<< "-mno-mutable-globals";
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if (DriverArgs.hasFlag(options::OPT_mno_sign_ext, options::OPT_msign_ext,
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false))
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getDriver().Diag(diag::err_drv_argument_not_allowed_with)
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<< "-pthread"
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<< "-mno-sign-ext";
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CC1Args.push_back("-target-feature");
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CC1Args.push_back("+atomics");
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CC1Args.push_back("-target-feature");
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CC1Args.push_back("+bulk-memory");
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CC1Args.push_back("-target-feature");
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CC1Args.push_back("+mutable-globals");
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CC1Args.push_back("-target-feature");
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CC1Args.push_back("+sign-ext");
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}
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if (!DriverArgs.hasFlag(options::OPT_mmutable_globals,
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options::OPT_mno_mutable_globals, false)) {
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// -fPIC implies +mutable-globals because the PIC ABI used by the linker
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// depends on importing and exporting mutable globals.
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llvm::Reloc::Model RelocationModel;
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unsigned PICLevel;
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bool IsPIE;
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std::tie(RelocationModel, PICLevel, IsPIE) =
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ParsePICArgs(*this, DriverArgs);
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if (RelocationModel == llvm::Reloc::PIC_) {
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if (DriverArgs.hasFlag(options::OPT_mno_mutable_globals,
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options::OPT_mmutable_globals, false)) {
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getDriver().Diag(diag::err_drv_argument_not_allowed_with)
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<< "-fPIC"
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<< "-mno-mutable-globals";
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}
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CC1Args.push_back("-target-feature");
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CC1Args.push_back("+mutable-globals");
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}
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}
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if (DriverArgs.getLastArg(options::OPT_fwasm_exceptions)) {
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// '-fwasm-exceptions' is not compatible with '-mno-exception-handling'
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if (DriverArgs.hasFlag(options::OPT_mno_exception_handing,
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options::OPT_mexception_handing, false))
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getDriver().Diag(diag::err_drv_argument_not_allowed_with)
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<< "-fwasm-exceptions"
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<< "-mno-exception-handling";
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// '-fwasm-exceptions' is not compatible with '-mno-reference-types'
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if (DriverArgs.hasFlag(options::OPT_mno_reference_types,
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options::OPT_mexception_handing, false))
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getDriver().Diag(diag::err_drv_argument_not_allowed_with)
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<< "-fwasm-exceptions"
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<< "-mno-reference-types";
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// '-fwasm-exceptions' is not compatible with
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// '-mllvm -enable-emscripten-cxx-exceptions'
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for (const Arg *A : DriverArgs.filtered(options::OPT_mllvm)) {
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if (StringRef(A->getValue(0)) == "-enable-emscripten-cxx-exceptions")
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getDriver().Diag(diag::err_drv_argument_not_allowed_with)
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<< "-fwasm-exceptions"
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<< "-mllvm -enable-emscripten-cxx-exceptions";
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}
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// '-fwasm-exceptions' implies exception-handling and reference-types
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CC1Args.push_back("-target-feature");
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CC1Args.push_back("+exception-handling");
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CC1Args.push_back("-target-feature");
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CC1Args.push_back("+reference-types");
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}
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}
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ToolChain::RuntimeLibType WebAssembly::GetDefaultRuntimeLibType() const {
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return ToolChain::RLT_CompilerRT;
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}
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ToolChain::CXXStdlibType
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WebAssembly::GetCXXStdlibType(const ArgList &Args) const {
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if (Arg *A = Args.getLastArg(options::OPT_stdlib_EQ)) {
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StringRef Value = A->getValue();
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if (Value != "libc++")
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getDriver().Diag(diag::err_drv_invalid_stdlib_name)
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<< A->getAsString(Args);
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}
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return ToolChain::CST_Libcxx;
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}
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void WebAssembly::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
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ArgStringList &CC1Args) const {
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if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc))
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return;
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const Driver &D = getDriver();
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if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
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SmallString<128> P(D.ResourceDir);
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llvm::sys::path::append(P, "include");
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addSystemInclude(DriverArgs, CC1Args, P);
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}
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if (DriverArgs.hasArg(options::OPT_nostdlibinc))
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return;
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// Check for configure-time C include directories.
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StringRef CIncludeDirs(C_INCLUDE_DIRS);
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if (CIncludeDirs != "") {
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SmallVector<StringRef, 5> dirs;
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CIncludeDirs.split(dirs, ":");
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for (StringRef dir : dirs) {
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StringRef Prefix =
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llvm::sys::path::is_absolute(dir) ? "" : StringRef(D.SysRoot);
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addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir);
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||
|
|
}
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (getTriple().getOS() != llvm::Triple::UnknownOS) {
|
||
|
|
const std::string MultiarchTriple =
|
||
|
|
getMultiarchTriple(D, getTriple(), D.SysRoot);
|
||
|
|
addSystemInclude(DriverArgs, CC1Args, D.SysRoot + "/include/" + MultiarchTriple);
|
||
|
|
}
|
||
|
|
addSystemInclude(DriverArgs, CC1Args, D.SysRoot + "/include");
|
||
|
|
}
|
||
|
|
|
||
|
|
void WebAssembly::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
|
||
|
|
ArgStringList &CC1Args) const {
|
||
|
|
if (!DriverArgs.hasArg(options::OPT_nostdlibinc) &&
|
||
|
|
!DriverArgs.hasArg(options::OPT_nostdincxx)) {
|
||
|
|
if (getTriple().getOS() != llvm::Triple::UnknownOS) {
|
||
|
|
const std::string MultiarchTriple =
|
||
|
|
getMultiarchTriple(getDriver(), getTriple(), getDriver().SysRoot);
|
||
|
|
addSystemInclude(DriverArgs, CC1Args,
|
||
|
|
getDriver().SysRoot + "/include/" + MultiarchTriple +
|
||
|
|
"/c++/v1");
|
||
|
|
}
|
||
|
|
addSystemInclude(DriverArgs, CC1Args,
|
||
|
|
getDriver().SysRoot + "/include/c++/v1");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void WebAssembly::AddCXXStdlibLibArgs(const llvm::opt::ArgList &Args,
|
||
|
|
llvm::opt::ArgStringList &CmdArgs) const {
|
||
|
|
|
||
|
|
switch (GetCXXStdlibType(Args)) {
|
||
|
|
case ToolChain::CST_Libcxx:
|
||
|
|
CmdArgs.push_back("-lc++");
|
||
|
|
CmdArgs.push_back("-lc++abi");
|
||
|
|
break;
|
||
|
|
case ToolChain::CST_Libstdcxx:
|
||
|
|
llvm_unreachable("invalid stdlib name");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
SanitizerMask WebAssembly::getSupportedSanitizers() const {
|
||
|
|
SanitizerMask Res = ToolChain::getSupportedSanitizers();
|
||
|
|
if (getTriple().isOSEmscripten()) {
|
||
|
|
Res |= SanitizerKind::Vptr | SanitizerKind::Leak | SanitizerKind::Address;
|
||
|
|
}
|
||
|
|
return Res;
|
||
|
|
}
|
||
|
|
|
||
|
|
Tool *WebAssembly::buildLinker() const {
|
||
|
|
return new tools::wasm::Linker(*this);
|
||
|
|
}
|