e8b2b8868d
Summary: This adds `-fwasm-exceptions` (in similar fashion with `-fdwarf-exceptions` or `-fsjlj-exceptions`) that turns on everything with wasm exception handling from the frontend to the backend. We currently have `-mexception-handling` in clang frontend, but this is only about the architecture capability and does not turn on other necessary options such as the exception model in the backend. (This can be turned on with `llc -exception-model=wasm`, but llc is not invoked separately as a command line tool, so this option has to be transferred from clang.) Turning on `-fwasm-exceptions` in clang also turns on `-mexception-handling` if not specified, and will error out if `-mno-exception-handling` is specified. Reviewers: dschuff, tlively, sbc100 Subscribers: aprantl, jgravelle-google, sunfish, cfe-commits Tags: #clang Differential Revision: https://reviews.llvm.org/D67208 llvm-svn: 371708
283 lines
10 KiB
C++
283 lines
10 KiB
C++
//===--- 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/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 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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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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if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles))
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CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crt1.o")));
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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, Linker, CmdArgs, Inputs));
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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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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(getDriver().SysRoot + "/lib");
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} else {
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const std::string MultiarchTriple =
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getMultiarchTriple(getDriver(), Triple, getDriver().SysRoot);
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getFilePaths().push_back(getDriver().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("-fuse-init-array");
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// '-pthread' implies atomics, bulk-memory, and mutable-globals
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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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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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}
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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
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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
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CC1Args.push_back("-target-feature");
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CC1Args.push_back("+exception-handling");
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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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}
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return;
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}
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if (getTriple().getOS() != llvm::Triple::UnknownOS) {
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const std::string MultiarchTriple =
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getMultiarchTriple(D, getTriple(), D.SysRoot);
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addSystemInclude(DriverArgs, CC1Args, D.SysRoot + "/include/" + MultiarchTriple);
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}
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addSystemInclude(DriverArgs, CC1Args, D.SysRoot + "/include");
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}
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void WebAssembly::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
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ArgStringList &CC1Args) const {
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if (!DriverArgs.hasArg(options::OPT_nostdlibinc) &&
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!DriverArgs.hasArg(options::OPT_nostdincxx)) {
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if (getTriple().getOS() != llvm::Triple::UnknownOS) {
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const std::string MultiarchTriple =
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getMultiarchTriple(getDriver(), getTriple(), getDriver().SysRoot);
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addSystemInclude(DriverArgs, CC1Args,
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getDriver().SysRoot + "/include/" + MultiarchTriple +
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"/c++/v1");
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}
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addSystemInclude(DriverArgs, CC1Args,
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getDriver().SysRoot + "/include/c++/v1");
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}
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}
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void WebAssembly::AddCXXStdlibLibArgs(const llvm::opt::ArgList &Args,
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llvm::opt::ArgStringList &CmdArgs) const {
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switch (GetCXXStdlibType(Args)) {
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case ToolChain::CST_Libcxx:
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CmdArgs.push_back("-lc++");
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CmdArgs.push_back("-lc++abi");
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break;
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case ToolChain::CST_Libstdcxx:
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llvm_unreachable("invalid stdlib name");
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}
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}
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SanitizerMask WebAssembly::getSupportedSanitizers() const {
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SanitizerMask Res = ToolChain::getSupportedSanitizers();
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if (getTriple().isOSEmscripten()) {
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Res |= SanitizerKind::Vptr | SanitizerKind::Leak | SanitizerKind::Address;
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}
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return Res;
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}
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Tool *WebAssembly::buildLinker() const {
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return new tools::wasm::Linker(*this);
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}
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