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Driver.cpp
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Driver.cpp
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//===--- Driver.cpp - Clang GCC Compatible Driver -------------------------===//
//
// 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 "clang/Driver/Driver.h"
#include "ToolChains/AIX.h"
#include "ToolChains/AMDGPU.h"
#include "ToolChains/AMDGPUOpenMP.h"
#include "ToolChains/AVR.h"
#include "ToolChains/Arch/RISCV.h"
#include "ToolChains/BareMetal.h"
#include "ToolChains/CSKYToolChain.h"
#include "ToolChains/Clang.h"
#include "ToolChains/CrossWindows.h"
#include "ToolChains/Cuda.h"
#include "ToolChains/Darwin.h"
#include "ToolChains/DragonFly.h"
#include "ToolChains/FreeBSD.h"
#include "ToolChains/Fuchsia.h"
#include "ToolChains/Gnu.h"
#include "ToolChains/HIPAMD.h"
#include "ToolChains/HIPSPV.h"
#include "ToolChains/HLSL.h"
#include "ToolChains/Haiku.h"
#include "ToolChains/Hexagon.h"
#include "ToolChains/Hurd.h"
#include "ToolChains/Lanai.h"
#include "ToolChains/Linux.h"
#include "ToolChains/MSP430.h"
#include "ToolChains/MSVC.h"
#include "ToolChains/MinGW.h"
#include "ToolChains/MipsLinux.h"
#include "ToolChains/NaCl.h"
#include "ToolChains/NetBSD.h"
#include "ToolChains/OHOS.h"
#include "ToolChains/OpenBSD.h"
#include "ToolChains/PPCFreeBSD.h"
#include "ToolChains/PPCLinux.h"
#include "ToolChains/PS4CPU.h"
#include "ToolChains/RISCVToolchain.h"
#include "ToolChains/SPIRV.h"
#include "ToolChains/Solaris.h"
#include "ToolChains/TCE.h"
#include "ToolChains/UEFI.h"
#include "ToolChains/VEToolchain.h"
#include "ToolChains/WebAssembly.h"
#include "ToolChains/XCore.h"
#include "ToolChains/ZOS.h"
#include "clang/Basic/DiagnosticDriver.h"
#include "clang/Basic/TargetID.h"
#include "clang/Basic/Version.h"
#include "clang/Config/config.h"
#include "clang/Driver/Action.h"
#include "clang/Driver/Compilation.h"
#include "clang/Driver/InputInfo.h"
#include "clang/Driver/Job.h"
#include "clang/Driver/Options.h"
#include "clang/Driver/Phases.h"
#include "clang/Driver/SanitizerArgs.h"
#include "clang/Driver/Tool.h"
#include "clang/Driver/ToolChain.h"
#include "clang/Driver/Types.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Option/Arg.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Option/OptSpecifier.h"
#include "llvm/Option/OptTable.h"
#include "llvm/Option/Option.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/ExitCodes.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/FormatVariadic.h"
#include "llvm/Support/MD5.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Process.h"
#include "llvm/Support/Program.h"
#include "llvm/Support/Regex.h"
#include "llvm/Support/StringSaver.h"
#include "llvm/Support/VirtualFileSystem.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/TargetParser/Host.h"
#include "llvm/TargetParser/RISCVISAInfo.h"
#include <cstdlib> // ::getenv
#include <map>
#include <memory>
#include <optional>
#include <set>
#include <utility>
#if LLVM_ON_UNIX
#include <unistd.h> // getpid
#endif
using namespace clang::driver;
using namespace clang;
using namespace llvm::opt;
static std::optional<llvm::Triple> getOffloadTargetTriple(const Driver &D,
const ArgList &Args) {
auto OffloadTargets = Args.getAllArgValues(options::OPT_offload_EQ);
// Offload compilation flow does not support multiple targets for now. We
// need the HIPActionBuilder (and possibly the CudaActionBuilder{,Base}too)
// to support multiple tool chains first.
switch (OffloadTargets.size()) {
default:
D.Diag(diag::err_drv_only_one_offload_target_supported);
return std::nullopt;
case 0:
D.Diag(diag::err_drv_invalid_or_unsupported_offload_target) << "";
return std::nullopt;
case 1:
break;
}
return llvm::Triple(OffloadTargets[0]);
}
static std::optional<llvm::Triple>
getNVIDIAOffloadTargetTriple(const Driver &D, const ArgList &Args,
const llvm::Triple &HostTriple) {
if (!Args.hasArg(options::OPT_offload_EQ)) {
return llvm::Triple(HostTriple.isArch64Bit() ? "nvptx64-nvidia-cuda"
: "nvptx-nvidia-cuda");
}
auto TT = getOffloadTargetTriple(D, Args);
if (TT && (TT->getArch() == llvm::Triple::spirv32 ||
TT->getArch() == llvm::Triple::spirv64)) {
if (Args.hasArg(options::OPT_emit_llvm))
return TT;
D.Diag(diag::err_drv_cuda_offload_only_emit_bc);
return std::nullopt;
}
D.Diag(diag::err_drv_invalid_or_unsupported_offload_target) << TT->str();
return std::nullopt;
}
static std::optional<llvm::Triple>
getHIPOffloadTargetTriple(const Driver &D, const ArgList &Args) {
if (!Args.hasArg(options::OPT_offload_EQ)) {
auto OffloadArchs = Args.getAllArgValues(options::OPT_offload_arch_EQ);
if (llvm::is_contained(OffloadArchs, "amdgcnspirv") &&
OffloadArchs.size() == 1)
return llvm::Triple("spirv64-amd-amdhsa");
return llvm::Triple("amdgcn-amd-amdhsa"); // Default HIP triple.
}
auto TT = getOffloadTargetTriple(D, Args);
if (!TT)
return std::nullopt;
if (TT->getArch() == llvm::Triple::amdgcn &&
TT->getVendor() == llvm::Triple::AMD &&
TT->getOS() == llvm::Triple::AMDHSA)
return TT;
if (TT->getArch() == llvm::Triple::spirv64)
return TT;
D.Diag(diag::err_drv_invalid_or_unsupported_offload_target) << TT->str();
return std::nullopt;
}
// static
std::string Driver::GetResourcesPath(StringRef BinaryPath) {
// Since the resource directory is embedded in the module hash, it's important
// that all places that need it call this function, so that they get the
// exact same string ("a/../b/" and "b/" get different hashes, for example).
// Dir is bin/ or lib/, depending on where BinaryPath is.
StringRef Dir = llvm::sys::path::parent_path(BinaryPath);
SmallString<128> P(Dir);
StringRef ConfiguredResourceDir(CLANG_RESOURCE_DIR);
if (!ConfiguredResourceDir.empty()) {
llvm::sys::path::append(P, ConfiguredResourceDir);
} else {
// On Windows, libclang.dll is in bin/.
// On non-Windows, libclang.so/.dylib is in lib/.
// With a static-library build of libclang, LibClangPath will contain the
// path of the embedding binary, which for LLVM binaries will be in bin/.
// ../lib gets us to lib/ in both cases.
P = llvm::sys::path::parent_path(Dir);
// This search path is also created in the COFF driver of lld, so any
// changes here also needs to happen in lld/COFF/Driver.cpp
llvm::sys::path::append(P, CLANG_INSTALL_LIBDIR_BASENAME, "clang",
CLANG_VERSION_MAJOR_STRING);
}
return std::string(P);
}
Driver::Driver(StringRef ClangExecutable, StringRef TargetTriple,
DiagnosticsEngine &Diags, std::string Title,
IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS)
: Diags(Diags), VFS(std::move(VFS)), Mode(GCCMode),
SaveTemps(SaveTempsNone), BitcodeEmbed(EmbedNone),
Offload(OffloadHostDevice), CXX20HeaderType(HeaderMode_None),
ModulesModeCXX20(false), LTOMode(LTOK_None),
ClangExecutable(ClangExecutable), SysRoot(DEFAULT_SYSROOT),
DriverTitle(Title), CCCPrintBindings(false), CCPrintOptions(false),
CCLogDiagnostics(false), CCGenDiagnostics(false),
CCPrintProcessStats(false), CCPrintInternalStats(false),
TargetTriple(TargetTriple), Saver(Alloc), PrependArg(nullptr),
CheckInputsExist(true), ProbePrecompiled(true),
SuppressMissingInputWarning(false) {
// Provide a sane fallback if no VFS is specified.
if (!this->VFS)
this->VFS = llvm::vfs::getRealFileSystem();
Name = std::string(llvm::sys::path::filename(ClangExecutable));
Dir = std::string(llvm::sys::path::parent_path(ClangExecutable));
if ((!SysRoot.empty()) && llvm::sys::path::is_relative(SysRoot)) {
// Prepend InstalledDir if SysRoot is relative
SmallString<128> P(Dir);
llvm::sys::path::append(P, SysRoot);
SysRoot = std::string(P);
}
#if defined(CLANG_CONFIG_FILE_SYSTEM_DIR)
if (llvm::sys::path::is_absolute(CLANG_CONFIG_FILE_SYSTEM_DIR)) {
SystemConfigDir = CLANG_CONFIG_FILE_SYSTEM_DIR;
} else {
SmallString<128> configFileDir(Dir);
llvm::sys::path::append(configFileDir, CLANG_CONFIG_FILE_SYSTEM_DIR);
llvm::sys::path::remove_dots(configFileDir, true);
SystemConfigDir = static_cast<std::string>(configFileDir);
}
#endif
#if defined(CLANG_CONFIG_FILE_USER_DIR)
{
SmallString<128> P;
llvm::sys::fs::expand_tilde(CLANG_CONFIG_FILE_USER_DIR, P);
UserConfigDir = static_cast<std::string>(P);
}
#endif
// Compute the path to the resource directory.
ResourceDir = GetResourcesPath(ClangExecutable);
}
void Driver::setDriverMode(StringRef Value) {
static StringRef OptName =
getOpts().getOption(options::OPT_driver_mode).getPrefixedName();
if (auto M = llvm::StringSwitch<std::optional<DriverMode>>(Value)
.Case("gcc", GCCMode)
.Case("g++", GXXMode)
.Case("cpp", CPPMode)
.Case("cl", CLMode)
.Case("flang", FlangMode)
.Case("dxc", DXCMode)
.Default(std::nullopt))
Mode = *M;
else
Diag(diag::err_drv_unsupported_option_argument) << OptName << Value;
}
InputArgList Driver::ParseArgStrings(ArrayRef<const char *> ArgStrings,
bool UseDriverMode, bool &ContainsError) {
llvm::PrettyStackTraceString CrashInfo("Command line argument parsing");
ContainsError = false;
llvm::opt::Visibility VisibilityMask = getOptionVisibilityMask(UseDriverMode);
unsigned MissingArgIndex, MissingArgCount;
InputArgList Args = getOpts().ParseArgs(ArgStrings, MissingArgIndex,
MissingArgCount, VisibilityMask);
// Check for missing argument error.
if (MissingArgCount) {
Diag(diag::err_drv_missing_argument)
<< Args.getArgString(MissingArgIndex) << MissingArgCount;
ContainsError |=
Diags.getDiagnosticLevel(diag::err_drv_missing_argument,
SourceLocation()) > DiagnosticsEngine::Warning;
}
// Check for unsupported options.
for (const Arg *A : Args) {
if (A->getOption().hasFlag(options::Unsupported)) {
Diag(diag::err_drv_unsupported_opt) << A->getAsString(Args);
ContainsError |= Diags.getDiagnosticLevel(diag::err_drv_unsupported_opt,
SourceLocation()) >
DiagnosticsEngine::Warning;
continue;
}
// Warn about -mcpu= without an argument.
if (A->getOption().matches(options::OPT_mcpu_EQ) && A->containsValue("")) {
Diag(diag::warn_drv_empty_joined_argument) << A->getAsString(Args);
ContainsError |= Diags.getDiagnosticLevel(
diag::warn_drv_empty_joined_argument,
SourceLocation()) > DiagnosticsEngine::Warning;
}
}
for (const Arg *A : Args.filtered(options::OPT_UNKNOWN)) {
unsigned DiagID;
auto ArgString = A->getAsString(Args);
std::string Nearest;
if (getOpts().findNearest(ArgString, Nearest, VisibilityMask) > 1) {
if (!IsCLMode() &&
getOpts().findExact(ArgString, Nearest,
llvm::opt::Visibility(options::CC1Option))) {
DiagID = diag::err_drv_unknown_argument_with_suggestion;
Diags.Report(DiagID) << ArgString << "-Xclang " + Nearest;
} else {
DiagID = IsCLMode() ? diag::warn_drv_unknown_argument_clang_cl
: diag::err_drv_unknown_argument;
Diags.Report(DiagID) << ArgString;
}
} else {
DiagID = IsCLMode()
? diag::warn_drv_unknown_argument_clang_cl_with_suggestion
: diag::err_drv_unknown_argument_with_suggestion;
Diags.Report(DiagID) << ArgString << Nearest;
}
ContainsError |= Diags.getDiagnosticLevel(DiagID, SourceLocation()) >
DiagnosticsEngine::Warning;
}
for (const Arg *A : Args.filtered(options::OPT_o)) {
if (ArgStrings[A->getIndex()] == A->getSpelling())
continue;
// Warn on joined arguments that are similar to a long argument.
std::string ArgString = ArgStrings[A->getIndex()];
std::string Nearest;
if (getOpts().findExact("-" + ArgString, Nearest, VisibilityMask))
Diags.Report(diag::warn_drv_potentially_misspelled_joined_argument)
<< A->getAsString(Args) << Nearest;
}
return Args;
}
// Determine which compilation mode we are in. We look for options which
// affect the phase, starting with the earliest phases, and record which
// option we used to determine the final phase.
phases::ID Driver::getFinalPhase(const DerivedArgList &DAL,
Arg **FinalPhaseArg) const {
Arg *PhaseArg = nullptr;
phases::ID FinalPhase;
// -{E,EP,P,M,MM} only run the preprocessor.
if (CCCIsCPP() || (PhaseArg = DAL.getLastArg(options::OPT_E)) ||
(PhaseArg = DAL.getLastArg(options::OPT__SLASH_EP)) ||
(PhaseArg = DAL.getLastArg(options::OPT_M, options::OPT_MM)) ||
(PhaseArg = DAL.getLastArg(options::OPT__SLASH_P)) ||
CCGenDiagnostics) {
FinalPhase = phases::Preprocess;
// --precompile only runs up to precompilation.
// Options that cause the output of C++20 compiled module interfaces or
// header units have the same effect.
} else if ((PhaseArg = DAL.getLastArg(options::OPT__precompile)) ||
(PhaseArg = DAL.getLastArg(options::OPT_extract_api)) ||
(PhaseArg = DAL.getLastArg(options::OPT_fmodule_header,
options::OPT_fmodule_header_EQ))) {
FinalPhase = phases::Precompile;
// -{fsyntax-only,-analyze,emit-ast} only run up to the compiler.
} else if ((PhaseArg = DAL.getLastArg(options::OPT_fsyntax_only)) ||
(PhaseArg = DAL.getLastArg(options::OPT_print_supported_cpus)) ||
(PhaseArg = DAL.getLastArg(options::OPT_print_enabled_extensions)) ||
(PhaseArg = DAL.getLastArg(options::OPT_module_file_info)) ||
(PhaseArg = DAL.getLastArg(options::OPT_verify_pch)) ||
(PhaseArg = DAL.getLastArg(options::OPT_rewrite_objc)) ||
(PhaseArg = DAL.getLastArg(options::OPT_rewrite_legacy_objc)) ||
(PhaseArg = DAL.getLastArg(options::OPT__migrate)) ||
(PhaseArg = DAL.getLastArg(options::OPT__analyze)) ||
(PhaseArg = DAL.getLastArg(options::OPT_emit_cir)) ||
(PhaseArg = DAL.getLastArg(options::OPT_emit_ast))) {
FinalPhase = phases::Compile;
// -S only runs up to the backend.
} else if ((PhaseArg = DAL.getLastArg(options::OPT_S))) {
FinalPhase = phases::Backend;
// -c compilation only runs up to the assembler.
} else if ((PhaseArg = DAL.getLastArg(options::OPT_c))) {
FinalPhase = phases::Assemble;
} else if ((PhaseArg = DAL.getLastArg(options::OPT_emit_interface_stubs))) {
FinalPhase = phases::IfsMerge;
// Otherwise do everything.
} else
FinalPhase = phases::Link;
if (FinalPhaseArg)
*FinalPhaseArg = PhaseArg;
return FinalPhase;
}
static Arg *MakeInputArg(DerivedArgList &Args, const OptTable &Opts,
StringRef Value, bool Claim = true) {
Arg *A = new Arg(Opts.getOption(options::OPT_INPUT), Value,
Args.getBaseArgs().MakeIndex(Value), Value.data());
Args.AddSynthesizedArg(A);
if (Claim)
A->claim();
return A;
}
DerivedArgList *Driver::TranslateInputArgs(const InputArgList &Args) const {
const llvm::opt::OptTable &Opts = getOpts();
DerivedArgList *DAL = new DerivedArgList(Args);
bool HasNostdlib = Args.hasArg(options::OPT_nostdlib);
bool HasNostdlibxx = Args.hasArg(options::OPT_nostdlibxx);
bool HasNodefaultlib = Args.hasArg(options::OPT_nodefaultlibs);
bool IgnoreUnused = false;
for (Arg *A : Args) {
if (IgnoreUnused)
A->claim();
if (A->getOption().matches(options::OPT_start_no_unused_arguments)) {
IgnoreUnused = true;
continue;
}
if (A->getOption().matches(options::OPT_end_no_unused_arguments)) {
IgnoreUnused = false;
continue;
}
// Unfortunately, we have to parse some forwarding options (-Xassembler,
// -Xlinker, -Xpreprocessor) because we either integrate their functionality
// (assembler and preprocessor), or bypass a previous driver ('collect2').
// Rewrite linker options, to replace --no-demangle with a custom internal
// option.
if ((A->getOption().matches(options::OPT_Wl_COMMA) ||
A->getOption().matches(options::OPT_Xlinker)) &&
A->containsValue("--no-demangle")) {
// Add the rewritten no-demangle argument.
DAL->AddFlagArg(A, Opts.getOption(options::OPT_Z_Xlinker__no_demangle));
// Add the remaining values as Xlinker arguments.
for (StringRef Val : A->getValues())
if (Val != "--no-demangle")
DAL->AddSeparateArg(A, Opts.getOption(options::OPT_Xlinker), Val);
continue;
}
// Rewrite preprocessor options, to replace -Wp,-MD,FOO which is used by
// some build systems. We don't try to be complete here because we don't
// care to encourage this usage model.
if (A->getOption().matches(options::OPT_Wp_COMMA) &&
A->getNumValues() > 0 &&
(A->getValue(0) == StringRef("-MD") ||
A->getValue(0) == StringRef("-MMD"))) {
// Rewrite to -MD/-MMD along with -MF.
if (A->getValue(0) == StringRef("-MD"))
DAL->AddFlagArg(A, Opts.getOption(options::OPT_MD));
else
DAL->AddFlagArg(A, Opts.getOption(options::OPT_MMD));
if (A->getNumValues() == 2)
DAL->AddSeparateArg(A, Opts.getOption(options::OPT_MF), A->getValue(1));
continue;
}
// Rewrite reserved library names.
if (A->getOption().matches(options::OPT_l)) {
StringRef Value = A->getValue();
// Rewrite unless -nostdlib is present.
if (!HasNostdlib && !HasNodefaultlib && !HasNostdlibxx &&
Value == "stdc++") {
DAL->AddFlagArg(A, Opts.getOption(options::OPT_Z_reserved_lib_stdcxx));
continue;
}
// Rewrite unconditionally.
if (Value == "cc_kext") {
DAL->AddFlagArg(A, Opts.getOption(options::OPT_Z_reserved_lib_cckext));
continue;
}
}
// Pick up inputs via the -- option.
if (A->getOption().matches(options::OPT__DASH_DASH)) {
A->claim();
for (StringRef Val : A->getValues())
DAL->append(MakeInputArg(*DAL, Opts, Val, false));
continue;
}
DAL->append(A);
}
// DXC mode quits before assembly if an output object file isn't specified.
if (IsDXCMode() && !Args.hasArg(options::OPT_dxc_Fo))
DAL->AddFlagArg(nullptr, Opts.getOption(options::OPT_S));
// Enforce -static if -miamcu is present.
if (Args.hasFlag(options::OPT_miamcu, options::OPT_mno_iamcu, false))
DAL->AddFlagArg(nullptr, Opts.getOption(options::OPT_static));
// Add a default value of -mlinker-version=, if one was given and the user
// didn't specify one.
#if defined(HOST_LINK_VERSION)
if (!Args.hasArg(options::OPT_mlinker_version_EQ) &&
strlen(HOST_LINK_VERSION) > 0) {
DAL->AddJoinedArg(0, Opts.getOption(options::OPT_mlinker_version_EQ),
HOST_LINK_VERSION);
DAL->getLastArg(options::OPT_mlinker_version_EQ)->claim();
}
#endif
return DAL;
}
/// Compute target triple from args.
///
/// This routine provides the logic to compute a target triple from various
/// args passed to the driver and the default triple string.
static llvm::Triple computeTargetTriple(const Driver &D,
StringRef TargetTriple,
const ArgList &Args,
StringRef DarwinArchName = "") {
// FIXME: Already done in Compilation *Driver::BuildCompilation
if (const Arg *A = Args.getLastArg(options::OPT_target))
TargetTriple = A->getValue();
llvm::Triple Target(llvm::Triple::normalize(TargetTriple));
// GNU/Hurd's triples should have been -hurd-gnu*, but were historically made
// -gnu* only, and we can not change this, so we have to detect that case as
// being the Hurd OS.
if (TargetTriple.contains("-unknown-gnu") || TargetTriple.contains("-pc-gnu"))
Target.setOSName("hurd");
// Handle Apple-specific options available here.
if (Target.isOSBinFormatMachO()) {
// If an explicit Darwin arch name is given, that trumps all.
if (!DarwinArchName.empty()) {
tools::darwin::setTripleTypeForMachOArchName(Target, DarwinArchName,
Args);
return Target;
}
// Handle the Darwin '-arch' flag.
if (Arg *A = Args.getLastArg(options::OPT_arch)) {
StringRef ArchName = A->getValue();
tools::darwin::setTripleTypeForMachOArchName(Target, ArchName, Args);
}
}
// Handle pseudo-target flags '-mlittle-endian'/'-EL' and
// '-mbig-endian'/'-EB'.
if (Arg *A = Args.getLastArgNoClaim(options::OPT_mlittle_endian,
options::OPT_mbig_endian)) {
llvm::Triple T = A->getOption().matches(options::OPT_mlittle_endian)
? Target.getLittleEndianArchVariant()
: Target.getBigEndianArchVariant();
if (T.getArch() != llvm::Triple::UnknownArch) {
Target = std::move(T);
Args.claimAllArgs(options::OPT_mlittle_endian, options::OPT_mbig_endian);
}
}
// Skip further flag support on OSes which don't support '-m32' or '-m64'.
if (Target.getArch() == llvm::Triple::tce)
return Target;
// On AIX, the env OBJECT_MODE may affect the resulting arch variant.
if (Target.isOSAIX()) {
if (std::optional<std::string> ObjectModeValue =
llvm::sys::Process::GetEnv("OBJECT_MODE")) {
StringRef ObjectMode = *ObjectModeValue;
llvm::Triple::ArchType AT = llvm::Triple::UnknownArch;
if (ObjectMode == "64") {
AT = Target.get64BitArchVariant().getArch();
} else if (ObjectMode == "32") {
AT = Target.get32BitArchVariant().getArch();
} else {
D.Diag(diag::err_drv_invalid_object_mode) << ObjectMode;
}
if (AT != llvm::Triple::UnknownArch && AT != Target.getArch())
Target.setArch(AT);
}
}
// The `-maix[32|64]` flags are only valid for AIX targets.
if (Arg *A = Args.getLastArgNoClaim(options::OPT_maix32, options::OPT_maix64);
A && !Target.isOSAIX())
D.Diag(diag::err_drv_unsupported_opt_for_target)
<< A->getAsString(Args) << Target.str();
// Handle pseudo-target flags '-m64', '-mx32', '-m32' and '-m16'.
Arg *A = Args.getLastArg(options::OPT_m64, options::OPT_mx32,
options::OPT_m32, options::OPT_m16,
options::OPT_maix32, options::OPT_maix64);
if (A) {
llvm::Triple::ArchType AT = llvm::Triple::UnknownArch;
if (A->getOption().matches(options::OPT_m64) ||
A->getOption().matches(options::OPT_maix64)) {
AT = Target.get64BitArchVariant().getArch();
if (Target.getEnvironment() == llvm::Triple::GNUX32 ||
Target.getEnvironment() == llvm::Triple::GNUT64)
Target.setEnvironment(llvm::Triple::GNU);
else if (Target.getEnvironment() == llvm::Triple::MuslX32)
Target.setEnvironment(llvm::Triple::Musl);
} else if (A->getOption().matches(options::OPT_mx32) &&
Target.get64BitArchVariant().getArch() == llvm::Triple::x86_64) {
AT = llvm::Triple::x86_64;
if (Target.getEnvironment() == llvm::Triple::Musl)
Target.setEnvironment(llvm::Triple::MuslX32);
else
Target.setEnvironment(llvm::Triple::GNUX32);
} else if (A->getOption().matches(options::OPT_m32) ||
A->getOption().matches(options::OPT_maix32)) {
AT = Target.get32BitArchVariant().getArch();
if (Target.getEnvironment() == llvm::Triple::GNUX32)
Target.setEnvironment(llvm::Triple::GNU);
else if (Target.getEnvironment() == llvm::Triple::MuslX32)
Target.setEnvironment(llvm::Triple::Musl);
} else if (A->getOption().matches(options::OPT_m16) &&
Target.get32BitArchVariant().getArch() == llvm::Triple::x86) {
AT = llvm::Triple::x86;
Target.setEnvironment(llvm::Triple::CODE16);
}
if (AT != llvm::Triple::UnknownArch && AT != Target.getArch()) {
Target.setArch(AT);
if (Target.isWindowsGNUEnvironment())
toolchains::MinGW::fixTripleArch(D, Target, Args);
}
}
// Handle -miamcu flag.
if (Args.hasFlag(options::OPT_miamcu, options::OPT_mno_iamcu, false)) {
if (Target.get32BitArchVariant().getArch() != llvm::Triple::x86)
D.Diag(diag::err_drv_unsupported_opt_for_target) << "-miamcu"
<< Target.str();
if (A && !A->getOption().matches(options::OPT_m32))
D.Diag(diag::err_drv_argument_not_allowed_with)
<< "-miamcu" << A->getBaseArg().getAsString(Args);
Target.setArch(llvm::Triple::x86);
Target.setArchName("i586");
Target.setEnvironment(llvm::Triple::UnknownEnvironment);
Target.setEnvironmentName("");
Target.setOS(llvm::Triple::ELFIAMCU);
Target.setVendor(llvm::Triple::UnknownVendor);
Target.setVendorName("intel");
}
// If target is MIPS adjust the target triple
// accordingly to provided ABI name.
if (Target.isMIPS()) {
if ((A = Args.getLastArg(options::OPT_mabi_EQ))) {
StringRef ABIName = A->getValue();
if (ABIName == "32") {
Target = Target.get32BitArchVariant();
if (Target.getEnvironment() == llvm::Triple::GNUABI64 ||
Target.getEnvironment() == llvm::Triple::GNUABIN32)
Target.setEnvironment(llvm::Triple::GNU);
} else if (ABIName == "n32") {
Target = Target.get64BitArchVariant();
if (Target.getEnvironment() == llvm::Triple::GNU ||
Target.getEnvironment() == llvm::Triple::GNUT64 ||
Target.getEnvironment() == llvm::Triple::GNUABI64)
Target.setEnvironment(llvm::Triple::GNUABIN32);
else if (Target.getEnvironment() == llvm::Triple::Musl ||
Target.getEnvironment() == llvm::Triple::MuslABI64)
Target.setEnvironment(llvm::Triple::MuslABIN32);
} else if (ABIName == "64") {
Target = Target.get64BitArchVariant();
if (Target.getEnvironment() == llvm::Triple::GNU ||
Target.getEnvironment() == llvm::Triple::GNUT64 ||
Target.getEnvironment() == llvm::Triple::GNUABIN32)
Target.setEnvironment(llvm::Triple::GNUABI64);
else if (Target.getEnvironment() == llvm::Triple::Musl ||
Target.getEnvironment() == llvm::Triple::MuslABIN32)
Target.setEnvironment(llvm::Triple::MuslABI64);
}
}
}
// If target is RISC-V adjust the target triple according to
// provided architecture name
if (Target.isRISCV()) {
if (Args.hasArg(options::OPT_march_EQ) ||
Args.hasArg(options::OPT_mcpu_EQ)) {
std::string ArchName = tools::riscv::getRISCVArch(Args, Target);
auto ISAInfo = llvm::RISCVISAInfo::parseArchString(
ArchName, /*EnableExperimentalExtensions=*/true);
if (!llvm::errorToBool(ISAInfo.takeError())) {
unsigned XLen = (*ISAInfo)->getXLen();
if (XLen == 32)
Target.setArch(llvm::Triple::riscv32);
else if (XLen == 64)
Target.setArch(llvm::Triple::riscv64);
}
}
}
return Target;
}
// Parse the LTO options and record the type of LTO compilation
// based on which -f(no-)?lto(=.*)? or -f(no-)?offload-lto(=.*)?
// option occurs last.
static driver::LTOKind parseLTOMode(Driver &D, const llvm::opt::ArgList &Args,
OptSpecifier OptEq, OptSpecifier OptNeg) {
if (!Args.hasFlag(OptEq, OptNeg, false))
return LTOK_None;
const Arg *A = Args.getLastArg(OptEq);
StringRef LTOName = A->getValue();
driver::LTOKind LTOMode = llvm::StringSwitch<LTOKind>(LTOName)
.Case("full", LTOK_Full)
.Case("thin", LTOK_Thin)
.Default(LTOK_Unknown);
if (LTOMode == LTOK_Unknown) {
D.Diag(diag::err_drv_unsupported_option_argument)
<< A->getSpelling() << A->getValue();
return LTOK_None;
}
return LTOMode;
}
// Parse the LTO options.
void Driver::setLTOMode(const llvm::opt::ArgList &Args) {
LTOMode =
parseLTOMode(*this, Args, options::OPT_flto_EQ, options::OPT_fno_lto);
OffloadLTOMode = parseLTOMode(*this, Args, options::OPT_foffload_lto_EQ,
options::OPT_fno_offload_lto);
// Try to enable `-foffload-lto=full` if `-fopenmp-target-jit` is on.
if (Args.hasFlag(options::OPT_fopenmp_target_jit,
options::OPT_fno_openmp_target_jit, false)) {
if (Arg *A = Args.getLastArg(options::OPT_foffload_lto_EQ,
options::OPT_fno_offload_lto))
if (OffloadLTOMode != LTOK_Full)
Diag(diag::err_drv_incompatible_options)
<< A->getSpelling() << "-fopenmp-target-jit";
OffloadLTOMode = LTOK_Full;
}
}
/// Compute the desired OpenMP runtime from the flags provided.
Driver::OpenMPRuntimeKind Driver::getOpenMPRuntime(const ArgList &Args) const {
StringRef RuntimeName(CLANG_DEFAULT_OPENMP_RUNTIME);
const Arg *A = Args.getLastArg(options::OPT_fopenmp_EQ);
if (A)
RuntimeName = A->getValue();
auto RT = llvm::StringSwitch<OpenMPRuntimeKind>(RuntimeName)
.Case("libomp", OMPRT_OMP)
.Case("libgomp", OMPRT_GOMP)
.Case("libiomp5", OMPRT_IOMP5)
.Default(OMPRT_Unknown);
if (RT == OMPRT_Unknown) {
if (A)
Diag(diag::err_drv_unsupported_option_argument)
<< A->getSpelling() << A->getValue();
else
// FIXME: We could use a nicer diagnostic here.
Diag(diag::err_drv_unsupported_opt) << "-fopenmp";
}
return RT;
}
void Driver::CreateOffloadingDeviceToolChains(Compilation &C,
InputList &Inputs) {
//
// CUDA/HIP
//
// We need to generate a CUDA/HIP toolchain if any of the inputs has a CUDA
// or HIP type. However, mixed CUDA/HIP compilation is not supported.
bool IsCuda =
llvm::any_of(Inputs, [](std::pair<types::ID, const llvm::opt::Arg *> &I) {
return types::isCuda(I.first);
});
bool IsHIP =
llvm::any_of(Inputs,
[](std::pair<types::ID, const llvm::opt::Arg *> &I) {
return types::isHIP(I.first);
}) ||
C.getInputArgs().hasArg(options::OPT_hip_link) ||
C.getInputArgs().hasArg(options::OPT_hipstdpar);
bool UseLLVMOffload = C.getInputArgs().hasArg(
options::OPT_foffload_via_llvm, options::OPT_fno_offload_via_llvm, false);
if (IsCuda && IsHIP) {
Diag(clang::diag::err_drv_mix_cuda_hip);
return;
}
if (IsCuda && !UseLLVMOffload) {
const ToolChain *HostTC = C.getSingleOffloadToolChain<Action::OFK_Host>();
const llvm::Triple &HostTriple = HostTC->getTriple();
auto OFK = Action::OFK_Cuda;
auto CudaTriple =
getNVIDIAOffloadTargetTriple(*this, C.getInputArgs(), HostTriple);
if (!CudaTriple)
return;
// Use the CUDA and host triples as the key into the ToolChains map,
// because the device toolchain we create depends on both.
auto &CudaTC = ToolChains[CudaTriple->str() + "/" + HostTriple.str()];
if (!CudaTC) {
CudaTC = std::make_unique<toolchains::CudaToolChain>(
*this, *CudaTriple, *HostTC, C.getInputArgs());
// Emit a warning if the detected CUDA version is too new.
CudaInstallationDetector &CudaInstallation =
static_cast<toolchains::CudaToolChain &>(*CudaTC).CudaInstallation;
if (CudaInstallation.isValid())
CudaInstallation.WarnIfUnsupportedVersion();
}
C.addOffloadDeviceToolChain(CudaTC.get(), OFK);
} else if (IsHIP && !UseLLVMOffload) {
if (auto *OMPTargetArg =
C.getInputArgs().getLastArg(options::OPT_fopenmp_targets_EQ)) {
Diag(clang::diag::err_drv_unsupported_opt_for_language_mode)
<< OMPTargetArg->getSpelling() << "HIP";
return;
}
const ToolChain *HostTC = C.getSingleOffloadToolChain<Action::OFK_Host>();
auto OFK = Action::OFK_HIP;
auto HIPTriple = getHIPOffloadTargetTriple(*this, C.getInputArgs());
if (!HIPTriple)
return;
auto *HIPTC = &getOffloadingDeviceToolChain(C.getInputArgs(), *HIPTriple,
*HostTC, OFK);
assert(HIPTC && "Could not create offloading device tool chain.");
C.addOffloadDeviceToolChain(HIPTC, OFK);
}
//
// OpenMP
//
// We need to generate an OpenMP toolchain if the user specified targets with
// the -fopenmp-targets option or used --offload-arch with OpenMP enabled.
bool IsOpenMPOffloading =
((IsCuda || IsHIP) && UseLLVMOffload) ||
(C.getInputArgs().hasFlag(options::OPT_fopenmp, options::OPT_fopenmp_EQ,
options::OPT_fno_openmp, false) &&
(C.getInputArgs().hasArg(options::OPT_fopenmp_targets_EQ) ||
C.getInputArgs().hasArg(options::OPT_offload_arch_EQ)));
if (IsOpenMPOffloading) {
// We expect that -fopenmp-targets is always used in conjunction with the
// option -fopenmp specifying a valid runtime with offloading support, i.e.
// libomp or libiomp.
OpenMPRuntimeKind RuntimeKind = getOpenMPRuntime(C.getInputArgs());
if (RuntimeKind != OMPRT_OMP && RuntimeKind != OMPRT_IOMP5) {
Diag(clang::diag::err_drv_expecting_fopenmp_with_fopenmp_targets);
return;
}
llvm::StringMap<llvm::DenseSet<StringRef>> DerivedArchs;
llvm::StringMap<StringRef> FoundNormalizedTriples;
std::multiset<StringRef> OpenMPTriples;
// If the user specified -fopenmp-targets= we create a toolchain for each
// valid triple. Otherwise, if only --offload-arch= was specified we instead
// attempt to derive the appropriate toolchains from the arguments.
if (Arg *OpenMPTargets =
C.getInputArgs().getLastArg(options::OPT_fopenmp_targets_EQ)) {
if (OpenMPTargets && !OpenMPTargets->getNumValues()) {
Diag(clang::diag::warn_drv_empty_joined_argument)
<< OpenMPTargets->getAsString(C.getInputArgs());
return;
}
for (StringRef T : OpenMPTargets->getValues())
OpenMPTriples.insert(T);
} else if (C.getInputArgs().hasArg(options::OPT_offload_arch_EQ) &&
((!IsHIP && !IsCuda) || UseLLVMOffload)) {
const ToolChain *HostTC = C.getSingleOffloadToolChain<Action::OFK_Host>();
auto AMDTriple = getHIPOffloadTargetTriple(*this, C.getInputArgs());
auto NVPTXTriple = getNVIDIAOffloadTargetTriple(*this, C.getInputArgs(),
HostTC->getTriple());
// Attempt to deduce the offloading triple from the set of architectures.
// We can only correctly deduce NVPTX / AMDGPU triples currently. We need
// to temporarily create these toolchains so that we can access tools for
// inferring architectures.
llvm::DenseSet<StringRef> Archs;
if (NVPTXTriple) {
auto TempTC = std::make_unique<toolchains::CudaToolChain>(
*this, *NVPTXTriple, *HostTC, C.getInputArgs());
for (StringRef Arch : getOffloadArchs(
C, C.getArgs(), Action::OFK_OpenMP, &*TempTC, true))
Archs.insert(Arch);
}
if (AMDTriple) {
auto TempTC = std::make_unique<toolchains::AMDGPUOpenMPToolChain>(
*this, *AMDTriple, *HostTC, C.getInputArgs());
for (StringRef Arch : getOffloadArchs(
C, C.getArgs(), Action::OFK_OpenMP, &*TempTC, true))
Archs.insert(Arch);
}
if (!AMDTriple && !NVPTXTriple) {
for (StringRef Arch :
getOffloadArchs(C, C.getArgs(), Action::OFK_OpenMP, nullptr, true))
Archs.insert(Arch);
}
for (StringRef Arch : Archs) {
if (NVPTXTriple && IsNVIDIAOffloadArch(StringToOffloadArch(
getProcessorFromTargetID(*NVPTXTriple, Arch)))) {
DerivedArchs[NVPTXTriple->getTriple()].insert(Arch);
} else if (AMDTriple &&
IsAMDOffloadArch(StringToOffloadArch(
getProcessorFromTargetID(*AMDTriple, Arch)))) {
DerivedArchs[AMDTriple->getTriple()].insert(Arch);
} else {
Diag(clang::diag::err_drv_failed_to_deduce_target_from_arch) << Arch;
return;
}
}
// If the set is empty then we failed to find a native architecture.
if (Archs.empty()) {
Diag(clang::diag::err_drv_failed_to_deduce_target_from_arch)
<< "native";
return;
}
for (const auto &TripleAndArchs : DerivedArchs)
OpenMPTriples.insert(TripleAndArchs.first());
}
for (StringRef Val : OpenMPTriples) {
llvm::Triple TT(ToolChain::getOpenMPTriple(Val));
std::string NormalizedName = TT.normalize();
// Make sure we don't have a duplicate triple.
auto Duplicate = FoundNormalizedTriples.find(NormalizedName);
if (Duplicate != FoundNormalizedTriples.end()) {
Diag(clang::diag::warn_drv_omp_offload_target_duplicate)
<< Val << Duplicate->second;
continue;
}
// Store the current triple so that we can check for duplicates in the
// following iterations.
FoundNormalizedTriples[NormalizedName] = Val;
// If the specified target is invalid, emit a diagnostic.
if (TT.getArch() == llvm::Triple::UnknownArch)
Diag(clang::diag::err_drv_invalid_omp_target) << Val;
else {
const ToolChain *TC;
// Device toolchains have to be selected differently. They pair host
// and device in their implementation.
if (TT.isNVPTX() || TT.isAMDGCN()) {
const ToolChain *HostTC =
C.getSingleOffloadToolChain<Action::OFK_Host>();
assert(HostTC && "Host toolchain should be always defined.");
auto &DeviceTC =
ToolChains[TT.str() + "/" + HostTC->getTriple().normalize()];
if (!DeviceTC) {
if (TT.isNVPTX())
DeviceTC = std::make_unique<toolchains::CudaToolChain>(
*this, TT, *HostTC, C.getInputArgs());
else if (TT.isAMDGCN())
DeviceTC = std::make_unique<toolchains::AMDGPUOpenMPToolChain>(
*this, TT, *HostTC, C.getInputArgs());
else
assert(DeviceTC && "Device toolchain not defined.");
}
TC = DeviceTC.get();
} else
TC = &getToolChain(C.getInputArgs(), TT);
C.addOffloadDeviceToolChain(TC, Action::OFK_OpenMP);
auto It = DerivedArchs.find(TT.getTriple());
if (It != DerivedArchs.end())
KnownArchs[TC] = It->second;
}
}
} else if (C.getInputArgs().hasArg(options::OPT_fopenmp_targets_EQ)) {
Diag(clang::diag::err_drv_expecting_fopenmp_with_fopenmp_targets);
return;
}
//
// TODO: Add support for other offloading programming models here.
//
}