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