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llvm-project/clang/lib/Driver/ToolChain.cpp

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//===--- ToolChain.cpp - Collections of tools for one platform ------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "Tools.h"
#include "clang/Basic/ObjCRuntime.h"
#include "clang/Driver/Action.h"
#include "clang/Driver/Driver.h"
#include "clang/Driver/DriverDiagnostic.h"
#include "clang/Driver/Options.h"
#include "clang/Driver/SanitizerArgs.h"
#include "clang/Driver/ToolChain.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Option/Arg.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Option/Option.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/TargetParser.h"
using namespace clang::driver;
using namespace clang::driver::tools;
using namespace clang;
using namespace llvm;
using namespace llvm::opt;
static llvm::opt::Arg *GetRTTIArgument(const ArgList &Args) {
return Args.getLastArg(options::OPT_mkernel, options::OPT_fapple_kext,
options::OPT_fno_rtti, options::OPT_frtti);
}
static ToolChain::RTTIMode CalculateRTTIMode(const ArgList &Args,
const llvm::Triple &Triple,
const Arg *CachedRTTIArg) {
// Explicit rtti/no-rtti args
if (CachedRTTIArg) {
if (CachedRTTIArg->getOption().matches(options::OPT_frtti))
return ToolChain::RM_EnabledExplicitly;
else
return ToolChain::RM_DisabledExplicitly;
}
// -frtti is default, except for the PS4 CPU.
if (!Triple.isPS4CPU())
return ToolChain::RM_EnabledImplicitly;
// On the PS4, turning on c++ exceptions turns on rtti.
// We're assuming that, if we see -fexceptions, rtti gets turned on.
Arg *Exceptions = Args.getLastArgNoClaim(
options::OPT_fcxx_exceptions, options::OPT_fno_cxx_exceptions,
options::OPT_fexceptions, options::OPT_fno_exceptions);
if (Exceptions &&
(Exceptions->getOption().matches(options::OPT_fexceptions) ||
Exceptions->getOption().matches(options::OPT_fcxx_exceptions)))
return ToolChain::RM_EnabledImplicitly;
return ToolChain::RM_DisabledImplicitly;
}
ToolChain::ToolChain(const Driver &D, const llvm::Triple &T,
const ArgList &Args)
: D(D), Triple(T), Args(Args), CachedRTTIArg(GetRTTIArgument(Args)),
CachedRTTIMode(CalculateRTTIMode(Args, Triple, CachedRTTIArg)) {
if (Arg *A = Args.getLastArg(options::OPT_mthread_model))
if (!isThreadModelSupported(A->getValue()))
D.Diag(diag::err_drv_invalid_thread_model_for_target)
<< A->getValue() << A->getAsString(Args);
}
ToolChain::~ToolChain() {
}
vfs::FileSystem &ToolChain::getVFS() const { return getDriver().getVFS(); }
bool ToolChain::useIntegratedAs() const {
return Args.hasFlag(options::OPT_fintegrated_as,
options::OPT_fno_integrated_as,
IsIntegratedAssemblerDefault());
}
const SanitizerArgs& ToolChain::getSanitizerArgs() const {
if (!SanitizerArguments.get())
SanitizerArguments.reset(new SanitizerArgs(*this, Args));
return *SanitizerArguments.get();
}
namespace {
struct DriverSuffix {
const char *Suffix;
const char *ModeFlag;
};
const DriverSuffix *FindDriverSuffix(StringRef ProgName) {
// A list of known driver suffixes. Suffixes are compared against the
// program name in order. If there is a match, the frontend type is updated as
// necessary by applying the ModeFlag.
static const DriverSuffix DriverSuffixes[] = {
{"clang", nullptr},
{"clang++", "--driver-mode=g++"},
{"clang-c++", "--driver-mode=g++"},
{"clang-cc", nullptr},
{"clang-cpp", "--driver-mode=cpp"},
{"clang-g++", "--driver-mode=g++"},
{"clang-gcc", nullptr},
{"clang-cl", "--driver-mode=cl"},
{"cc", nullptr},
{"cpp", "--driver-mode=cpp"},
{"cl", "--driver-mode=cl"},
{"++", "--driver-mode=g++"},
};
for (size_t i = 0; i < llvm::array_lengthof(DriverSuffixes); ++i)
if (ProgName.endswith(DriverSuffixes[i].Suffix))
return &DriverSuffixes[i];
return nullptr;
}
/// Normalize the program name from argv[0] by stripping the file extension if
/// present and lower-casing the string on Windows.
std::string normalizeProgramName(llvm::StringRef Argv0) {
std::string ProgName = llvm::sys::path::stem(Argv0);
#ifdef LLVM_ON_WIN32
// Transform to lowercase for case insensitive file systems.
std::transform(ProgName.begin(), ProgName.end(), ProgName.begin(), ::tolower);
#endif
return ProgName;
}
const DriverSuffix *parseDriverSuffix(StringRef ProgName) {
// Try to infer frontend type and default target from the program name by
// comparing it against DriverSuffixes in order.
// If there is a match, the function tries to identify a target as prefix.
// E.g. "x86_64-linux-clang" as interpreted as suffix "clang" with target
// prefix "x86_64-linux". If such a target prefix is found, it may be
// added via -target as implicit first argument.
const DriverSuffix *DS = FindDriverSuffix(ProgName);
if (!DS) {
// Try again after stripping any trailing version number:
// clang++3.5 -> clang++
ProgName = ProgName.rtrim("0123456789.");
DS = FindDriverSuffix(ProgName);
}
if (!DS) {
// Try again after stripping trailing -component.
// clang++-tot -> clang++
ProgName = ProgName.slice(0, ProgName.rfind('-'));
DS = FindDriverSuffix(ProgName);
}
return DS;
}
} // anonymous namespace
std::pair<std::string, std::string>
ToolChain::getTargetAndModeFromProgramName(StringRef PN) {
std::string ProgName = normalizeProgramName(PN);
const DriverSuffix *DS = parseDriverSuffix(ProgName);
if (!DS)
return std::make_pair("", "");
std::string ModeFlag = DS->ModeFlag == nullptr ? "" : DS->ModeFlag;
std::string::size_type LastComponent =
ProgName.rfind('-', ProgName.size() - strlen(DS->Suffix));
if (LastComponent == std::string::npos)
return std::make_pair("", ModeFlag);
// Infer target from the prefix.
StringRef Prefix(ProgName);
Prefix = Prefix.slice(0, LastComponent);
std::string IgnoredError;
std::string Target;
if (llvm::TargetRegistry::lookupTarget(Prefix, IgnoredError)) {
Target = Prefix;
}
return std::make_pair(Target, ModeFlag);
}
StringRef ToolChain::getDefaultUniversalArchName() const {
// In universal driver terms, the arch name accepted by -arch isn't exactly
// the same as the ones that appear in the triple. Roughly speaking, this is
// an inverse of the darwin::getArchTypeForDarwinArchName() function, but the
// only interesting special case is powerpc.
switch (Triple.getArch()) {
case llvm::Triple::ppc:
return "ppc";
case llvm::Triple::ppc64:
return "ppc64";
case llvm::Triple::ppc64le:
return "ppc64le";
default:
return Triple.getArchName();
}
}
bool ToolChain::IsUnwindTablesDefault() const {
return false;
}
Tool *ToolChain::getClang() const {
if (!Clang)
Clang.reset(new tools::Clang(*this));
return Clang.get();
}
Tool *ToolChain::buildAssembler() const {
return new tools::ClangAs(*this);
}
Tool *ToolChain::buildLinker() const {
llvm_unreachable("Linking is not supported by this toolchain");
}
Tool *ToolChain::getAssemble() const {
if (!Assemble)
Assemble.reset(buildAssembler());
return Assemble.get();
}
Tool *ToolChain::getClangAs() const {
if (!Assemble)
Assemble.reset(new tools::ClangAs(*this));
return Assemble.get();
}
Tool *ToolChain::getLink() const {
if (!Link)
Link.reset(buildLinker());
return Link.get();
}
Tool *ToolChain::getTool(Action::ActionClass AC) const {
switch (AC) {
case Action::AssembleJobClass:
return getAssemble();
case Action::LinkJobClass:
return getLink();
case Action::InputClass:
case Action::BindArchClass:
case Action::CudaDeviceClass:
case Action::CudaHostClass:
case Action::LipoJobClass:
case Action::DsymutilJobClass:
case Action::VerifyDebugInfoJobClass:
llvm_unreachable("Invalid tool kind.");
case Action::CompileJobClass:
case Action::PrecompileJobClass:
case Action::PreprocessJobClass:
case Action::AnalyzeJobClass:
case Action::MigrateJobClass:
case Action::VerifyPCHJobClass:
case Action::BackendJobClass:
return getClang();
}
llvm_unreachable("Invalid tool kind.");
}
static StringRef getArchNameForCompilerRTLib(const ToolChain &TC,
const ArgList &Args) {
const llvm::Triple &Triple = TC.getTriple();
bool IsWindows = Triple.isOSWindows();
if (Triple.isWindowsMSVCEnvironment() && TC.getArch() == llvm::Triple::x86)
return "i386";
if (TC.getArch() == llvm::Triple::arm || TC.getArch() == llvm::Triple::armeb)
return (arm::getARMFloatABI(TC, Args) == arm::FloatABI::Hard && !IsWindows)
? "armhf"
: "arm";
return TC.getArchName();
}
std::string ToolChain::getCompilerRT(const ArgList &Args, StringRef Component,
bool Shared) const {
const llvm::Triple &TT = getTriple();
const char *Env = TT.isAndroid() ? "-android" : "";
bool IsITANMSVCWindows =
TT.isWindowsMSVCEnvironment() || TT.isWindowsItaniumEnvironment();
StringRef Arch = getArchNameForCompilerRTLib(*this, Args);
const char *Prefix = IsITANMSVCWindows ? "" : "lib";
const char *Suffix = Shared ? (Triple.isOSWindows() ? ".dll" : ".so")
: (IsITANMSVCWindows ? ".lib" : ".a");
SmallString<128> Path(getDriver().ResourceDir);
StringRef OSLibName = Triple.isOSFreeBSD() ? "freebsd" : getOS();
llvm::sys::path::append(Path, "lib", OSLibName);
llvm::sys::path::append(Path, Prefix + Twine("clang_rt.") + Component + "-" +
Arch + Env + Suffix);
return Path.str();
}
const char *ToolChain::getCompilerRTArgString(const llvm::opt::ArgList &Args,
StringRef Component,
bool Shared) const {
return Args.MakeArgString(getCompilerRT(Args, Component, Shared));
}
bool ToolChain::needsProfileRT(const ArgList &Args) {
if (Args.hasFlag(options::OPT_fprofile_arcs, options::OPT_fno_profile_arcs,
false) ||
Args.hasArg(options::OPT_fprofile_generate) ||
Args.hasArg(options::OPT_fprofile_generate_EQ) ||
Args.hasArg(options::OPT_fprofile_instr_generate) ||
Args.hasArg(options::OPT_fprofile_instr_generate_EQ) ||
Args.hasArg(options::OPT_fcreate_profile) ||
Args.hasArg(options::OPT_coverage))
return true;
return false;
}
Tool *ToolChain::SelectTool(const JobAction &JA) const {
if (getDriver().ShouldUseClangCompiler(JA)) return getClang();
Action::ActionClass AC = JA.getKind();
if (AC == Action::AssembleJobClass && useIntegratedAs())
return getClangAs();
return getTool(AC);
}
std::string ToolChain::GetFilePath(const char *Name) const {
return D.GetFilePath(Name, *this);
}
std::string ToolChain::GetProgramPath(const char *Name) const {
return D.GetProgramPath(Name, *this);
}
std::string ToolChain::GetLinkerPath() const {
if (Arg *A = Args.getLastArg(options::OPT_fuse_ld_EQ)) {
StringRef Suffix = A->getValue();
// If we're passed -fuse-ld= with no argument, or with the argument ld,
// then use whatever the default system linker is.
if (Suffix.empty() || Suffix == "ld")
return GetProgramPath("ld");
llvm::SmallString<8> LinkerName("ld.");
LinkerName.append(Suffix);
std::string LinkerPath(GetProgramPath(LinkerName.c_str()));
if (llvm::sys::fs::exists(LinkerPath))
return LinkerPath;
getDriver().Diag(diag::err_drv_invalid_linker_name) << A->getAsString(Args);
return "";
}
return GetProgramPath(DefaultLinker);
}
types::ID ToolChain::LookupTypeForExtension(const char *Ext) const {
return types::lookupTypeForExtension(Ext);
}
bool ToolChain::HasNativeLLVMSupport() const {
return false;
}
bool ToolChain::isCrossCompiling() const {
llvm::Triple HostTriple(LLVM_HOST_TRIPLE);
switch (HostTriple.getArch()) {
// The A32/T32/T16 instruction sets are not separate architectures in this
// context.
case llvm::Triple::arm:
case llvm::Triple::armeb:
case llvm::Triple::thumb:
case llvm::Triple::thumbeb:
return getArch() != llvm::Triple::arm && getArch() != llvm::Triple::thumb &&
getArch() != llvm::Triple::armeb && getArch() != llvm::Triple::thumbeb;
default:
return HostTriple.getArch() != getArch();
}
}
ObjCRuntime ToolChain::getDefaultObjCRuntime(bool isNonFragile) const {
return ObjCRuntime(isNonFragile ? ObjCRuntime::GNUstep : ObjCRuntime::GCC,
VersionTuple());
}
bool ToolChain::isThreadModelSupported(const StringRef Model) const {
if (Model == "single") {
// FIXME: 'single' is only supported on ARM and WebAssembly so far.
return Triple.getArch() == llvm::Triple::arm ||
Triple.getArch() == llvm::Triple::armeb ||
Triple.getArch() == llvm::Triple::thumb ||
Triple.getArch() == llvm::Triple::thumbeb ||
Triple.getArch() == llvm::Triple::wasm32 ||
Triple.getArch() == llvm::Triple::wasm64;
} else if (Model == "posix")
return true;
return false;
}
std::string ToolChain::ComputeLLVMTriple(const ArgList &Args,
types::ID InputType) const {
switch (getTriple().getArch()) {
default:
return getTripleString();
case llvm::Triple::x86_64: {
llvm::Triple Triple = getTriple();
if (!Triple.isOSBinFormatMachO())
return getTripleString();
if (Arg *A = Args.getLastArg(options::OPT_march_EQ)) {
// x86_64h goes in the triple. Other -march options just use the
// vanilla triple we already have.
StringRef MArch = A->getValue();
if (MArch == "x86_64h")
Triple.setArchName(MArch);
}
return Triple.getTriple();
}
case llvm::Triple::aarch64: {
llvm::Triple Triple = getTriple();
if (!Triple.isOSBinFormatMachO())
return getTripleString();
// FIXME: older versions of ld64 expect the "arm64" component in the actual
// triple string and query it to determine whether an LTO file can be
// handled. Remove this when we don't care any more.
Triple.setArchName("arm64");
return Triple.getTriple();
}
case llvm::Triple::arm:
case llvm::Triple::armeb:
case llvm::Triple::thumb:
case llvm::Triple::thumbeb: {
// FIXME: Factor into subclasses.
llvm::Triple Triple = getTriple();
bool IsBigEndian = getTriple().getArch() == llvm::Triple::armeb ||
getTriple().getArch() == llvm::Triple::thumbeb;
// Handle pseudo-target flags '-mlittle-endian'/'-EL' and
// '-mbig-endian'/'-EB'.
if (Arg *A = Args.getLastArg(options::OPT_mlittle_endian,
options::OPT_mbig_endian)) {
IsBigEndian = !A->getOption().matches(options::OPT_mlittle_endian);
}
// Thumb2 is the default for V7 on Darwin.
//
// FIXME: Thumb should just be another -target-feaure, not in the triple.
StringRef MCPU, MArch;
if (const Arg *A = Args.getLastArg(options::OPT_mcpu_EQ))
MCPU = A->getValue();
if (const Arg *A = Args.getLastArg(options::OPT_march_EQ))
MArch = A->getValue();
std::string CPU =
Triple.isOSBinFormatMachO()
? tools::arm::getARMCPUForMArch(MArch, Triple).str()
: tools::arm::getARMTargetCPU(MCPU, MArch, Triple);
StringRef Suffix =
tools::arm::getLLVMArchSuffixForARM(CPU, MArch, Triple);
bool IsMProfile = ARM::parseArchProfile(Suffix) == ARM::PK_M;
bool ThumbDefault = IsMProfile || (ARM::parseArchVersion(Suffix) == 7 &&
getTriple().isOSBinFormatMachO());
// FIXME: this is invalid for WindowsCE
if (getTriple().isOSWindows())
ThumbDefault = true;
std::string ArchName;
if (IsBigEndian)
ArchName = "armeb";
else
ArchName = "arm";
// Assembly files should start in ARM mode, unless arch is M-profile.
if ((InputType != types::TY_PP_Asm && Args.hasFlag(options::OPT_mthumb,
options::OPT_mno_thumb, ThumbDefault)) || IsMProfile) {
if (IsBigEndian)
ArchName = "thumbeb";
else
ArchName = "thumb";
}
Triple.setArchName(ArchName + Suffix.str());
return Triple.getTriple();
}
}
}
std::string ToolChain::ComputeEffectiveClangTriple(const ArgList &Args,
types::ID InputType) const {
return ComputeLLVMTriple(Args, InputType);
}
void ToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
ArgStringList &CC1Args) const {
// Each toolchain should provide the appropriate include flags.
}
void ToolChain::addClangTargetOptions(const ArgList &DriverArgs,
ArgStringList &CC1Args) const {
}
void ToolChain::addClangWarningOptions(ArgStringList &CC1Args) const {}
void ToolChain::addProfileRTLibs(const llvm::opt::ArgList &Args,
llvm::opt::ArgStringList &CmdArgs) const {
if (!needsProfileRT(Args)) return;
CmdArgs.push_back(getCompilerRTArgString(Args, "profile"));
return;
}
ToolChain::RuntimeLibType ToolChain::GetRuntimeLibType(
const ArgList &Args) const {
if (Arg *A = Args.getLastArg(options::OPT_rtlib_EQ)) {
StringRef Value = A->getValue();
if (Value == "compiler-rt")
return ToolChain::RLT_CompilerRT;
if (Value == "libgcc")
return ToolChain::RLT_Libgcc;
getDriver().Diag(diag::err_drv_invalid_rtlib_name)
<< A->getAsString(Args);
}
return GetDefaultRuntimeLibType();
}
ToolChain::CXXStdlibType ToolChain::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;
if (Value == "libstdc++")
return ToolChain::CST_Libstdcxx;
getDriver().Diag(diag::err_drv_invalid_stdlib_name)
<< A->getAsString(Args);
}
return ToolChain::CST_Libstdcxx;
}
/// \brief Utility function to add a system include directory to CC1 arguments.
/*static*/ void ToolChain::addSystemInclude(const ArgList &DriverArgs,
ArgStringList &CC1Args,
const Twine &Path) {
CC1Args.push_back("-internal-isystem");
CC1Args.push_back(DriverArgs.MakeArgString(Path));
}
/// \brief Utility function to add a system include directory with extern "C"
/// semantics to CC1 arguments.
///
/// Note that this should be used rarely, and only for directories that
/// historically and for legacy reasons are treated as having implicit extern
/// "C" semantics. These semantics are *ignored* by and large today, but its
/// important to preserve the preprocessor changes resulting from the
/// classification.
/*static*/ void ToolChain::addExternCSystemInclude(const ArgList &DriverArgs,
ArgStringList &CC1Args,
const Twine &Path) {
CC1Args.push_back("-internal-externc-isystem");
CC1Args.push_back(DriverArgs.MakeArgString(Path));
}
void ToolChain::addExternCSystemIncludeIfExists(const ArgList &DriverArgs,
ArgStringList &CC1Args,
const Twine &Path) {
if (llvm::sys::fs::exists(Path))
addExternCSystemInclude(DriverArgs, CC1Args, Path);
}
/// \brief Utility function to add a list of system include directories to CC1.
/*static*/ void ToolChain::addSystemIncludes(const ArgList &DriverArgs,
ArgStringList &CC1Args,
ArrayRef<StringRef> Paths) {
for (StringRef Path : Paths) {
CC1Args.push_back("-internal-isystem");
CC1Args.push_back(DriverArgs.MakeArgString(Path));
}
}
void ToolChain::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
ArgStringList &CC1Args) const {
// Header search paths should be handled by each of the subclasses.
// Historically, they have not been, and instead have been handled inside of
// the CC1-layer frontend. As the logic is hoisted out, this generic function
// will slowly stop being called.
//
// While it is being called, replicate a bit of a hack to propagate the
// '-stdlib=' flag down to CC1 so that it can in turn customize the C++
// header search paths with it. Once all systems are overriding this
// function, the CC1 flag and this line can be removed.
DriverArgs.AddAllArgs(CC1Args, options::OPT_stdlib_EQ);
}
void ToolChain::AddCXXStdlibLibArgs(const ArgList &Args,
ArgStringList &CmdArgs) const {
CXXStdlibType Type = GetCXXStdlibType(Args);
switch (Type) {
case ToolChain::CST_Libcxx:
CmdArgs.push_back("-lc++");
break;
case ToolChain::CST_Libstdcxx:
CmdArgs.push_back("-lstdc++");
break;
}
}
void ToolChain::AddFilePathLibArgs(const ArgList &Args,
ArgStringList &CmdArgs) const {
for (const auto &LibPath : getFilePaths())
CmdArgs.push_back(Args.MakeArgString(StringRef("-L") + LibPath));
}
void ToolChain::AddCCKextLibArgs(const ArgList &Args,
ArgStringList &CmdArgs) const {
CmdArgs.push_back("-lcc_kext");
}
bool ToolChain::AddFastMathRuntimeIfAvailable(const ArgList &Args,
ArgStringList &CmdArgs) const {
// Do not check for -fno-fast-math or -fno-unsafe-math when -Ofast passed
// (to keep the linker options consistent with gcc and clang itself).
if (!isOptimizationLevelFast(Args)) {
// Check if -ffast-math or -funsafe-math.
Arg *A =
Args.getLastArg(options::OPT_ffast_math, options::OPT_fno_fast_math,
options::OPT_funsafe_math_optimizations,
options::OPT_fno_unsafe_math_optimizations);
if (!A || A->getOption().getID() == options::OPT_fno_fast_math ||
A->getOption().getID() == options::OPT_fno_unsafe_math_optimizations)
return false;
}
// If crtfastmath.o exists add it to the arguments.
std::string Path = GetFilePath("crtfastmath.o");
if (Path == "crtfastmath.o") // Not found.
return false;
CmdArgs.push_back(Args.MakeArgString(Path));
return true;
}
SanitizerMask ToolChain::getSupportedSanitizers() const {
// Return sanitizers which don't require runtime support and are not
// platform dependent.
using namespace SanitizerKind;
SanitizerMask Res = (Undefined & ~Vptr & ~Function) | (CFI & ~CFIICall) |
CFICastStrict | UnsignedIntegerOverflow | LocalBounds;
if (getTriple().getArch() == llvm::Triple::x86 ||
getTriple().getArch() == llvm::Triple::x86_64)
Res |= CFIICall;
return Res;
}
void ToolChain::AddCudaIncludeArgs(const ArgList &DriverArgs,
ArgStringList &CC1Args) const {}
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