void tools::AddGoldPlugin(const ToolChain &ToolChain, const ArgList &Args,
ArgStringList &CmdArgs, bool IsThinLTO,
const Driver &D) {
// Tell the linker to load the plugin. This has to come before AddLinkerInputs
// as gold requires -plugin to come before any -plugin-opt that -Wl might
// forward.
CmdArgs.push_back("-plugin");
#if defined(LLVM_ON_WIN32)
const char *Suffix = ".dll";
#elif defined(__APPLE__)
const char *Suffix = ".dylib";
#else
const char *Suffix = ".so";
#endif
SmallString<1024> Plugin;
llvm::sys::path::native(Twine(ToolChain.getDriver().Dir) +
"/../lib" CLANG_LIBDIR_SUFFIX "/LLVMgold" +
Suffix,
Plugin);
CmdArgs.push_back(Args.MakeArgString(Plugin));
// Try to pass driver level flags relevant to LTO code generation down to
// the plugin.
// Handle flags for selecting CPU variants.
std::string CPU = getCPUName(Args, ToolChain.getTriple());
if (!CPU.empty())
CmdArgs.push_back(Args.MakeArgString(Twine("-plugin-opt=mcpu=") + CPU));
if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
StringRef OOpt;
if (A->getOption().matches(options::OPT_O4) ||
A->getOption().matches(options::OPT_Ofast))
OOpt = "3";
else if (A->getOption().matches(options::OPT_O))
OOpt = A->getValue();
else if (A->getOption().matches(options::OPT_O0))
OOpt = "0";
if (!OOpt.empty())
CmdArgs.push_back(Args.MakeArgString(Twine("-plugin-opt=O") + OOpt));
}
if (IsThinLTO)
CmdArgs.push_back("-plugin-opt=thinlto");
if (unsigned Parallelism = getLTOParallelism(Args, D))
CmdArgs.push_back(Args.MakeArgString(Twine("-plugin-opt=jobs=") +
llvm::to_string(Parallelism)));
// If an explicit debugger tuning argument appeared, pass it along.
if (Arg *A = Args.getLastArg(options::OPT_gTune_Group,
options::OPT_ggdbN_Group)) {
if (A->getOption().matches(options::OPT_glldb))
CmdArgs.push_back("-plugin-opt=-debugger-tune=lldb");
else if (A->getOption().matches(options::OPT_gsce))
CmdArgs.push_back("-plugin-opt=-debugger-tune=sce");
else
CmdArgs.push_back("-plugin-opt=-debugger-tune=gdb");
}
bool UseSeparateSections =
isUseSeparateSections(ToolChain.getEffectiveTriple());
if (Args.hasFlag(options::OPT_ffunction_sections,
options::OPT_fno_function_sections, UseSeparateSections)) {
CmdArgs.push_back("-plugin-opt=-function-sections");
}
if (Args.hasFlag(options::OPT_fdata_sections, options::OPT_fno_data_sections,
UseSeparateSections)) {
CmdArgs.push_back("-plugin-opt=-data-sections");
}
if (Arg *A = getLastProfileSampleUseArg(Args)) {
StringRef FName = A->getValue();
if (!llvm::sys::fs::exists(FName))
D.Diag(diag::err_drv_no_such_file) << FName;
else
CmdArgs.push_back(
Args.MakeArgString(Twine("-plugin-opt=sample-profile=") + FName));
}
// Need this flag to turn on new pass manager via Gold plugin.
if (Args.hasFlag(options::OPT_fexperimental_new_pass_manager,
options::OPT_fno_experimental_new_pass_manager,
/* Default */ false)) {
CmdArgs.push_back("-plugin-opt=new-pass-manager");
}
}
/// Parses the various -fpic/-fPIC/-fpie/-fPIE arguments. Then,
/// smooshes them together with platform defaults, to decide whether
/// this compile should be using PIC mode or not. Returns a tuple of
/// (RelocationModel, PICLevel, IsPIE).
std::tuple<llvm::Reloc::Model, unsigned, bool>
tools::ParsePICArgs(const ToolChain &ToolChain, const ArgList &Args) {
const llvm::Triple &EffectiveTriple = ToolChain.getEffectiveTriple();
const llvm::Triple &Triple = ToolChain.getTriple();
bool PIE = ToolChain.isPIEDefault();
bool PIC = PIE || ToolChain.isPICDefault();
// The Darwin/MachO default to use PIC does not apply when using -static.
if (Triple.isOSBinFormatMachO() && Args.hasArg(options::OPT_static))
PIE = PIC = false;
bool IsPICLevelTwo = PIC;
bool KernelOrKext =
Args.hasArg(options::OPT_mkernel, options::OPT_fapple_kext);
// Android-specific defaults for PIC/PIE
if (Triple.isAndroid()) {
switch (Triple.getArch()) {
case llvm::Triple::arm:
case llvm::Triple::armeb:
case llvm::Triple::thumb:
case llvm::Triple::thumbeb:
case llvm::Triple::aarch64:
case llvm::Triple::mips:
case llvm::Triple::mipsel:
case llvm::Triple::mips64:
case llvm::Triple::mips64el:
PIC = true; // "-fpic"
break;
case llvm::Triple::x86:
case llvm::Triple::x86_64:
PIC = true; // "-fPIC"
IsPICLevelTwo = true;
break;
default:
break;
}
}
// OpenBSD-specific defaults for PIE
if (Triple.getOS() == llvm::Triple::OpenBSD) {
switch (ToolChain.getArch()) {
case llvm::Triple::arm:
case llvm::Triple::aarch64:
case llvm::Triple::mips64:
case llvm::Triple::mips64el:
case llvm::Triple::x86:
case llvm::Triple::x86_64:
IsPICLevelTwo = false; // "-fpie"
break;
case llvm::Triple::ppc:
case llvm::Triple::sparc:
case llvm::Triple::sparcel:
case llvm::Triple::sparcv9:
IsPICLevelTwo = true; // "-fPIE"
break;
default:
break;
}
}
// The last argument relating to either PIC or PIE wins, and no
// other argument is used. If the last argument is any flavor of the
// '-fno-...' arguments, both PIC and PIE are disabled. Any PIE
// option implicitly enables PIC at the same level.
Arg *LastPICArg = Args.getLastArg(options::OPT_fPIC, options::OPT_fno_PIC,
options::OPT_fpic, options::OPT_fno_pic,
options::OPT_fPIE, options::OPT_fno_PIE,
options::OPT_fpie, options::OPT_fno_pie);
if (Triple.isOSWindows() && LastPICArg &&
LastPICArg ==
Args.getLastArg(options::OPT_fPIC, options::OPT_fpic,
options::OPT_fPIE, options::OPT_fpie)) {
ToolChain.getDriver().Diag(diag::err_drv_unsupported_opt_for_target)
<< LastPICArg->getSpelling() << Triple.str();
if (Triple.getArch() == llvm::Triple::x86_64)
return std::make_tuple(llvm::Reloc::PIC_, 2U, false);
return std::make_tuple(llvm::Reloc::Static, 0U, false);
}
// Check whether the tool chain trumps the PIC-ness decision. If the PIC-ness
// is forced, then neither PIC nor PIE flags will have no effect.
if (!ToolChain.isPICDefaultForced()) {
if (LastPICArg) {
Option O = LastPICArg->getOption();
if (O.matches(options::OPT_fPIC) || O.matches(options::OPT_fpic) ||
O.matches(options::OPT_fPIE) || O.matches(options::OPT_fpie)) {
PIE = O.matches(options::OPT_fPIE) || O.matches(options::OPT_fpie);
PIC =
PIE || O.matches(options::OPT_fPIC) || O.matches(options::OPT_fpic);
IsPICLevelTwo =
O.matches(options::OPT_fPIE) || O.matches(options::OPT_fPIC);
} else {
PIE = PIC = false;
if (EffectiveTriple.isPS4CPU()) {
Arg *ModelArg = Args.getLastArg(options::OPT_mcmodel_EQ);
StringRef Model = ModelArg ? ModelArg->getValue() : "";
if (Model != "kernel") {
PIC = true;
ToolChain.getDriver().Diag(diag::warn_drv_ps4_force_pic)
<< LastPICArg->getSpelling();
}
}
}
}
}
// Introduce a Darwin and PS4-specific hack. If the default is PIC, but the
// PIC level would've been set to level 1, force it back to level 2 PIC
// instead.
if (PIC && (Triple.isOSDarwin() || EffectiveTriple.isPS4CPU()))
IsPICLevelTwo |= ToolChain.isPICDefault();
// This kernel flags are a trump-card: they will disable PIC/PIE
// generation, independent of the argument order.
if (KernelOrKext &&
((!EffectiveTriple.isiOS() || EffectiveTriple.isOSVersionLT(6)) &&
!EffectiveTriple.isWatchOS()))
PIC = PIE = false;
if (Arg *A = Args.getLastArg(options::OPT_mdynamic_no_pic)) {
// This is a very special mode. It trumps the other modes, almost no one
// uses it, and it isn't even valid on any OS but Darwin.
if (!Triple.isOSDarwin())
ToolChain.getDriver().Diag(diag::err_drv_unsupported_opt_for_target)
<< A->getSpelling() << Triple.str();
// FIXME: Warn when this flag trumps some other PIC or PIE flag.
// Only a forced PIC mode can cause the actual compile to have PIC defines
// etc., no flags are sufficient. This behavior was selected to closely
// match that of llvm-gcc and Apple GCC before that.
PIC = ToolChain.isPICDefault() && ToolChain.isPICDefaultForced();
return std::make_tuple(llvm::Reloc::DynamicNoPIC, PIC ? 2U : 0U, false);
}
bool EmbeddedPISupported;
switch (Triple.getArch()) {
case llvm::Triple::arm:
case llvm::Triple::armeb:
case llvm::Triple::thumb:
case llvm::Triple::thumbeb:
EmbeddedPISupported = true;
break;
default:
EmbeddedPISupported = false;
break;
}
bool ROPI = false, RWPI = false;
Arg* LastROPIArg = Args.getLastArg(options::OPT_fropi, options::OPT_fno_ropi);
if (LastROPIArg && LastROPIArg->getOption().matches(options::OPT_fropi)) {
if (!EmbeddedPISupported)
ToolChain.getDriver().Diag(diag::err_drv_unsupported_opt_for_target)
<< LastROPIArg->getSpelling() << Triple.str();
ROPI = true;
}
Arg *LastRWPIArg = Args.getLastArg(options::OPT_frwpi, options::OPT_fno_rwpi);
if (LastRWPIArg && LastRWPIArg->getOption().matches(options::OPT_frwpi)) {
if (!EmbeddedPISupported)
ToolChain.getDriver().Diag(diag::err_drv_unsupported_opt_for_target)
<< LastRWPIArg->getSpelling() << Triple.str();
RWPI = true;
}
// ROPI and RWPI are not comaptible with PIC or PIE.
if ((ROPI || RWPI) && (PIC || PIE))
ToolChain.getDriver().Diag(diag::err_drv_ropi_rwpi_incompatible_with_pic);
// When targettng MIPS64 with N64, the default is PIC, unless -mno-abicalls is
// used.
if ((Triple.getArch() == llvm::Triple::mips64 ||
Triple.getArch() == llvm::Triple::mips64el) &&
Args.hasArg(options::OPT_mno_abicalls))
return std::make_tuple(llvm::Reloc::Static, 0U, false);
if (PIC)
return std::make_tuple(llvm::Reloc::PIC_, IsPICLevelTwo ? 2U : 1U, PIE);
llvm::Reloc::Model RelocM = llvm::Reloc::Static;
if (ROPI && RWPI)
RelocM = llvm::Reloc::ROPI_RWPI;
else if (ROPI)
RelocM = llvm::Reloc::ROPI;
else if (RWPI)
RelocM = llvm::Reloc::RWPI;
return std::make_tuple(RelocM, 0U, false);
}
// Select the float ABI as determined by -msoft-float, -mhard-float, and
// -mfloat-abi=.
arm::FloatABI arm::getARMFloatABI(const ToolChain &TC, const ArgList &Args) {
const Driver &D = TC.getDriver();
const llvm::Triple &Triple = TC.getEffectiveTriple();
auto SubArch = getARMSubArchVersionNumber(Triple);
arm::FloatABI ABI = FloatABI::Invalid;
if (Arg *A =
Args.getLastArg(options::OPT_msoft_float, options::OPT_mhard_float,
options::OPT_mfloat_abi_EQ)) {
if (A->getOption().matches(options::OPT_msoft_float)) {
ABI = FloatABI::Soft;
} else if (A->getOption().matches(options::OPT_mhard_float)) {
ABI = FloatABI::Hard;
} else {
ABI = llvm::StringSwitch<arm::FloatABI>(A->getValue())
.Case("soft", FloatABI::Soft)
.Case("softfp", FloatABI::SoftFP)
.Case("hard", FloatABI::Hard)
.Default(FloatABI::Invalid);
if (ABI == FloatABI::Invalid && !StringRef(A->getValue()).empty()) {
D.Diag(diag::err_drv_invalid_mfloat_abi) << A->getAsString(Args);
ABI = FloatABI::Soft;
}
}
// It is incorrect to select hard float ABI on MachO platforms if the ABI is
// "apcs-gnu".
if (Triple.isOSBinFormatMachO() && !useAAPCSForMachO(Triple) &&
ABI == FloatABI::Hard) {
D.Diag(diag::err_drv_unsupported_opt_for_target) << A->getAsString(Args)
<< Triple.getArchName();
}
}
// If unspecified, choose the default based on the platform.
if (ABI == FloatABI::Invalid) {
switch (Triple.getOS()) {
case llvm::Triple::Darwin:
case llvm::Triple::MacOSX:
case llvm::Triple::IOS:
case llvm::Triple::TvOS: {
// Darwin defaults to "softfp" for v6 and v7.
ABI = (SubArch == 6 || SubArch == 7) ? FloatABI::SoftFP : FloatABI::Soft;
ABI = Triple.isWatchABI() ? FloatABI::Hard : ABI;
break;
}
case llvm::Triple::WatchOS:
ABI = FloatABI::Hard;
break;
// FIXME: this is invalid for WindowsCE
case llvm::Triple::Win32:
ABI = FloatABI::Hard;
break;
case llvm::Triple::NetBSD:
switch (Triple.getEnvironment()) {
case llvm::Triple::EABIHF:
case llvm::Triple::GNUEABIHF:
ABI = FloatABI::Hard;
break;
default:
ABI = FloatABI::Soft;
break;
}
break;
case llvm::Triple::FreeBSD:
switch (Triple.getEnvironment()) {
case llvm::Triple::GNUEABIHF:
ABI = FloatABI::Hard;
break;
default:
// FreeBSD defaults to soft float
ABI = FloatABI::Soft;
break;
}
break;
case llvm::Triple::OpenBSD:
ABI = FloatABI::Soft;
break;
default:
switch (Triple.getEnvironment()) {
case llvm::Triple::GNUEABIHF:
case llvm::Triple::MuslEABIHF:
case llvm::Triple::EABIHF:
ABI = FloatABI::Hard;
break;
case llvm::Triple::GNUEABI:
case llvm::Triple::MuslEABI:
case llvm::Triple::EABI:
// EABI is always AAPCS, and if it was not marked 'hard', it's softfp
ABI = FloatABI::SoftFP;
break;
case llvm::Triple::Android:
ABI = (SubArch == 7) ? FloatABI::SoftFP : FloatABI::Soft;
break;
default:
// Assume "soft", but warn the user we are guessing.
if (Triple.isOSBinFormatMachO() &&
Triple.getSubArch() == llvm::Triple::ARMSubArch_v7em)
ABI = FloatABI::Hard;
else
ABI = FloatABI::Soft;
if (Triple.getOS() != llvm::Triple::UnknownOS ||
!Triple.isOSBinFormatMachO())
D.Diag(diag::warn_drv_assuming_mfloat_abi_is) << "soft";
break;
}
}
}
assert(ABI != FloatABI::Invalid && "must select an ABI");
return ABI;
}