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llvm-project/clang/lib/Driver/ToolChains/WebAssembly.cpp
Heejin Ahn 3fbc344b49
[WebAssembly] Refactor Wasm EH/SjLj error checking (#122466) 
There were many overlaps between error checking and feature enabling
routines for Wasm EH and Wasm SjLj. This tries to factor out those
common routines in separate lambda functions.

This is not NFC because this ends up disallowing a few new combinations
(e.g. `-fwasm-exceptions` and `-emscripten-cxx-exceptions-allowed`), and
also deletes `-mllvm` from the error messages to share the same lambda
function between options with `-mllvm` and those without it.

This adds a few more tests but does not try to cover every single
possible disallowed combination.
2025-01-10 13:05:57 -08:00

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//===--- 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 "Gnu.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/Config/llvm-config.h" // for LLVM_VERSION_STRING
#include "llvm/Option/ArgList.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/VirtualFileSystem.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.
std::string WebAssembly::getMultiarchTriple(const Driver &D,
const llvm::Triple &TargetTriple,
StringRef SysRoot) const {
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);
// Interpret 'lld' as explicitly requesting `wasm-ld`, so look for that
// linker. Note that for `wasm32-wasip2` this overrides the default linker
// of `wasm-component-ld`.
if (UseLinker == "lld") {
return ToolChain.GetProgramPath("wasm-ld");
}
// Allow 'ld' as an alias for the default linker
if (UseLinker != "ld")
ToolChain.getDriver().Diag(diag::err_drv_invalid_linker_name)
<< A->getAsString(Args);
}
}
return ToolChain.GetProgramPath(ToolChain.getDefaultLinker());
}
static bool TargetBuildsComponents(const llvm::Triple &TargetTriple) {
// WASIp2 and above are all based on components, so test for WASI but exclude
// the original `wasi` target in addition to the `wasip1` name.
return TargetTriple.isOSWASI() && TargetTriple.getOSName() != "wasip1" &&
TargetTriple.getOSName() != "wasi";
}
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 (ToolChain.getTriple().isArch64Bit())
CmdArgs.push_back("wasm64");
else
CmdArgs.push_back("wasm32");
if (Args.hasArg(options::OPT_s))
CmdArgs.push_back("--strip-all");
// On `wasip2` the default linker is `wasm-component-ld` which wraps the
// execution of `wasm-ld`. Find `wasm-ld` and pass it as an argument of where
// to find it to avoid it needing to hunt and rediscover or search `PATH` for
// where it is.
if (llvm::sys::path::stem(Linker).ends_with_insensitive(
"wasm-component-ld")) {
CmdArgs.push_back("--wasm-ld-path");
CmdArgs.push_back(Args.MakeArgString(ToolChain.GetProgramPath("wasm-ld")));
}
Args.addAllArgs(CmdArgs, {options::OPT_L, options::OPT_u});
ToolChain.AddFilePathLibArgs(Args, CmdArgs);
bool IsCommand = true;
const char *Crt1;
const char *Entry = nullptr;
// When -shared is specified, use the reactor exec model unless
// specified otherwise.
if (Args.hasArg(options::OPT_shared))
IsCommand = false;
if (const Arg *A = Args.getLastArg(options::OPT_mexec_model_EQ)) {
StringRef CM = A->getValue();
if (CM == "command") {
IsCommand = true;
} else if (CM == "reactor") {
IsCommand = false;
} else {
ToolChain.getDriver().Diag(diag::err_drv_invalid_argument_to_option)
<< CM << A->getOption().getName();
}
}
if (IsCommand) {
// If crt1-command.o exists, it supports new-style commands, so use it.
// Otherwise, use the old crt1.o. This is a temporary transition measure.
// Once WASI libc no longer needs to support LLVM versions which lack
// support for new-style command, it can make crt1.o the same as
// crt1-command.o. And once LLVM no longer needs to support WASI libc
// versions before that, it can switch to using crt1-command.o.
Crt1 = "crt1.o";
if (ToolChain.GetFilePath("crt1-command.o") != "crt1-command.o")
Crt1 = "crt1-command.o";
} else {
Crt1 = "crt1-reactor.o";
Entry = "_initialize";
}
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));
}
if (Args.hasArg(options::OPT_shared))
CmdArgs.push_back(Args.MakeArgString("-shared"));
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);
}
ToolChain.addProfileRTLibs(Args, CmdArgs);
CmdArgs.push_back("-o");
CmdArgs.push_back(Output.getFilename());
// Don't use wasm-opt by default on `wasip2` as it doesn't have support for
// components at this time. Retain the historical default otherwise, though,
// of running `wasm-opt` by default.
bool WasmOptDefault = !TargetBuildsComponents(ToolChain.getTriple());
bool RunWasmOpt = Args.hasFlag(options::OPT_wasm_opt,
options::OPT_no_wasm_opt, WasmOptDefault);
// If wasm-opt is enabled and optimizations are happening look for the
// `wasm-opt` program. If it's not found auto-disable it.
std::string WasmOptPath;
if (RunWasmOpt && Args.getLastArg(options::OPT_O_Group)) {
WasmOptPath = ToolChain.GetProgramPath("wasm-opt");
if (WasmOptPath == "wasm-opt") {
WasmOptPath = {};
}
}
if (!WasmOptPath.empty()) {
CmdArgs.push_back("--keep-section=target_features");
}
C.addCommand(std::make_unique<Command>(JA, *this,
ResponseFileSupport::AtFileCurCP(),
Linker, CmdArgs, Inputs, Output));
if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
if (!WasmOptPath.empty()) {
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 OptArgs;
OptArgs.push_back(Output.getFilename());
OptArgs.push_back(Args.MakeArgString(llvm::Twine("-O") + OOpt));
OptArgs.push_back("-o");
OptArgs.push_back(Output.getFilename());
C.addCommand(std::make_unique<Command>(
JA, *this, ResponseFileSupport::AtFileCurCP(), WasmOpt, OptArgs,
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().Dir);
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);
}
}
const char *WebAssembly::getDefaultLinker() const {
if (TargetBuildsComponents(getTriple()))
return "wasm-component-ld";
return "wasm-ld";
}
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 llvm::opt::ArgList &Args) const {
return false;
}
bool WebAssembly::isPICDefaultForced() const { return false; }
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");
}
}
// Bans incompatible options for Wasm EH / SjLj. We don't allow using
// different modes for EH and SjLj.
auto BanIncompatibleOptionsForWasmEHSjLj = [&](StringRef CurOption) {
if (DriverArgs.hasFlag(options::OPT_mno_exception_handing,
options::OPT_mexception_handing, false))
getDriver().Diag(diag::err_drv_argument_not_allowed_with)
<< CurOption << "-mno-exception-handling";
// The standardized Wasm EH spec requires multivalue and reference-types.
if (DriverArgs.hasFlag(options::OPT_mno_multivalue,
options::OPT_mmultivalue, false))
getDriver().Diag(diag::err_drv_argument_not_allowed_with)
<< CurOption << "-mno-multivalue";
if (DriverArgs.hasFlag(options::OPT_mno_reference_types,
options::OPT_mreference_types, false))
getDriver().Diag(diag::err_drv_argument_not_allowed_with)
<< CurOption << "-mno-reference-types";
for (const Arg *A : DriverArgs.filtered(options::OPT_mllvm)) {
for (const auto *Option :
{"-enable-emscripten-cxx-exceptions", "-enable-emscripten-sjlj",
"-emscripten-cxx-exceptions-allowed"}) {
if (StringRef(A->getValue(0)) == Option)
getDriver().Diag(diag::err_drv_argument_not_allowed_with)
<< CurOption << Option;
}
}
};
// Enable necessary features for Wasm EH / SjLj in the backend.
auto EnableFeaturesForWasmEHSjLj = [&]() {
CC1Args.push_back("-target-feature");
CC1Args.push_back("+exception-handling");
// The standardized Wasm EH spec requires multivalue and reference-types.
CC1Args.push_back("-target-feature");
CC1Args.push_back("+multivalue");
CC1Args.push_back("-target-feature");
CC1Args.push_back("+reference-types");
// Backend needs '-exception-model=wasm' to use Wasm EH instructions
CC1Args.push_back("-exception-model=wasm");
};
if (DriverArgs.getLastArg(options::OPT_fwasm_exceptions)) {
BanIncompatibleOptionsForWasmEHSjLj("-fwasm-exceptions");
EnableFeaturesForWasmEHSjLj();
// Backend needs -wasm-enable-eh to enable Wasm EH
CC1Args.push_back("-mllvm");
CC1Args.push_back("-wasm-enable-eh");
}
for (const Arg *A : DriverArgs.filtered(options::OPT_mllvm)) {
StringRef Opt = A->getValue(0);
if (Opt.starts_with("-emscripten-cxx-exceptions-allowed")) {
// '-mllvm -emscripten-cxx-exceptions-allowed' should be used with
// '-mllvm -enable-emscripten-cxx-exceptions'
bool EmEHArgExists = false;
for (const Arg *A : DriverArgs.filtered(options::OPT_mllvm)) {
if (StringRef(A->getValue(0)) == "-enable-emscripten-cxx-exceptions") {
EmEHArgExists = true;
break;
}
}
if (!EmEHArgExists)
getDriver().Diag(diag::err_drv_argument_only_allowed_with)
<< "-mllvm -emscripten-cxx-exceptions-allowed"
<< "-mllvm -enable-emscripten-cxx-exceptions";
// Prevent functions specified in -emscripten-cxx-exceptions-allowed list
// from being inlined before reaching the wasm backend.
StringRef FuncNamesStr = Opt.split('=').second;
SmallVector<StringRef, 4> FuncNames;
FuncNamesStr.split(FuncNames, ',');
for (auto Name : FuncNames) {
CC1Args.push_back("-mllvm");
CC1Args.push_back(DriverArgs.MakeArgString("--force-attribute=" + Name +
":noinline"));
}
}
for (const auto *Option : {"-wasm-enable-eh", "-wasm-enable-sjlj"}) {
if (Opt.starts_with(Option)) {
BanIncompatibleOptionsForWasmEHSjLj(Option);
EnableFeaturesForWasmEHSjLj();
}
}
}
}
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++")
return ToolChain::CST_Libcxx;
else if (Value == "libstdc++")
return ToolChain::CST_Libstdcxx;
else
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, options::OPT_nostdinc,
options::OPT_nostdincxx))
return;
switch (GetCXXStdlibType(DriverArgs)) {
case ToolChain::CST_Libcxx:
addLibCxxIncludePaths(DriverArgs, CC1Args);
break;
case ToolChain::CST_Libstdcxx:
addLibStdCXXIncludePaths(DriverArgs, CC1Args);
break;
}
}
void WebAssembly::AddCXXStdlibLibArgs(const llvm::opt::ArgList &Args,
llvm::opt::ArgStringList &CmdArgs) const {
switch (GetCXXStdlibType(Args)) {
case ToolChain::CST_Libcxx:
CmdArgs.push_back("-lc++");
if (Args.hasArg(options::OPT_fexperimental_library))
CmdArgs.push_back("-lc++experimental");
CmdArgs.push_back("-lc++abi");
break;
case ToolChain::CST_Libstdcxx:
CmdArgs.push_back("-lstdc++");
break;
}
}
SanitizerMask WebAssembly::getSupportedSanitizers() const {
SanitizerMask Res = ToolChain::getSupportedSanitizers();
if (getTriple().isOSEmscripten()) {
Res |= SanitizerKind::Vptr | SanitizerKind::Leak | SanitizerKind::Address;
}
// -fsanitize=function places two words before the function label, which are
// -unsupported.
Res &= ~SanitizerKind::Function;
return Res;
}
Tool *WebAssembly::buildLinker() const {
return new tools::wasm::Linker(*this);
}
void WebAssembly::addLibCxxIncludePaths(
const llvm::opt::ArgList &DriverArgs,
llvm::opt::ArgStringList &CC1Args) const {
const Driver &D = getDriver();
std::string SysRoot = computeSysRoot();
std::string LibPath = SysRoot + "/include";
const std::string MultiarchTriple =
getMultiarchTriple(D, getTriple(), SysRoot);
bool IsKnownOs = (getTriple().getOS() != llvm::Triple::UnknownOS);
std::string Version = detectLibcxxVersion(LibPath);
if (Version.empty())
return;
// First add the per-target include path if the OS is known.
if (IsKnownOs) {
std::string TargetDir = LibPath + "/" + MultiarchTriple + "/c++/" + Version;
addSystemInclude(DriverArgs, CC1Args, TargetDir);
}
// Second add the generic one.
addSystemInclude(DriverArgs, CC1Args, LibPath + "/c++/" + Version);
}
void WebAssembly::addLibStdCXXIncludePaths(
const llvm::opt::ArgList &DriverArgs,
llvm::opt::ArgStringList &CC1Args) const {
// We cannot use GCCInstallationDetector here as the sysroot usually does
// not contain a full GCC installation.
// Instead, we search the given sysroot for /usr/include/xx, similar
// to how we do it for libc++.
const Driver &D = getDriver();
std::string SysRoot = computeSysRoot();
std::string LibPath = SysRoot + "/include";
const std::string MultiarchTriple =
getMultiarchTriple(D, getTriple(), SysRoot);
bool IsKnownOs = (getTriple().getOS() != llvm::Triple::UnknownOS);
// This is similar to detectLibcxxVersion()
std::string Version;
{
std::error_code EC;
Generic_GCC::GCCVersion MaxVersion =
Generic_GCC::GCCVersion::Parse("0.0.0");
SmallString<128> Path(LibPath);
llvm::sys::path::append(Path, "c++");
for (llvm::vfs::directory_iterator LI = getVFS().dir_begin(Path, EC), LE;
!EC && LI != LE; LI = LI.increment(EC)) {
StringRef VersionText = llvm::sys::path::filename(LI->path());
if (VersionText[0] != 'v') {
auto Version = Generic_GCC::GCCVersion::Parse(VersionText);
if (Version > MaxVersion)
MaxVersion = Version;
}
}
if (MaxVersion.Major > 0)
Version = MaxVersion.Text;
}
if (Version.empty())
return;
// First add the per-target include path if the OS is known.
if (IsKnownOs) {
std::string TargetDir = LibPath + "/c++/" + Version + "/" + MultiarchTriple;
addSystemInclude(DriverArgs, CC1Args, TargetDir);
}
// Second add the generic one.
addSystemInclude(DriverArgs, CC1Args, LibPath + "/c++/" + Version);
// Third the backward one.
addSystemInclude(DriverArgs, CC1Args, LibPath + "/c++/" + Version + "/backward");
}
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