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Tools.cpp
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Tools.cpp
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//===--- Tools.cpp - Tools Implementations --------------------------------===//
//
// 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 "InputInfo.h"
#include "ToolChains.h"
#include "clang/Basic/CharInfo.h"
#include "clang/Basic/LangOptions.h"
#include "clang/Basic/ObjCRuntime.h"
#include "clang/Basic/Version.h"
#include "clang/Config/config.h"
#include "clang/Driver/Action.h"
#include "clang/Driver/Compilation.h"
#include "clang/Driver/Driver.h"
#include "clang/Driver/DriverDiagnostic.h"
#include "clang/Driver/Job.h"
#include "clang/Driver/Options.h"
#include "clang/Driver/SanitizerArgs.h"
#include "clang/Driver/ToolChain.h"
#include "clang/Driver/Util.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Option/Arg.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Option/Option.h"
#include "llvm/Support/TargetParser.h"
#include "llvm/Support/Compression.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Process.h"
#include "llvm/Support/Program.h"
#include "llvm/Support/raw_ostream.h"
#ifdef LLVM_ON_UNIX
#include <unistd.h> // For getuid().
#endif
using namespace clang::driver;
using namespace clang::driver::tools;
using namespace clang;
using namespace llvm::opt;
static void addAssemblerKPIC(const ArgList &Args, ArgStringList &CmdArgs) {
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 (!LastPICArg)
return;
if (LastPICArg->getOption().matches(options::OPT_fPIC) ||
LastPICArg->getOption().matches(options::OPT_fpic) ||
LastPICArg->getOption().matches(options::OPT_fPIE) ||
LastPICArg->getOption().matches(options::OPT_fpie)) {
CmdArgs.push_back("-KPIC");
}
}
/// CheckPreprocessingOptions - Perform some validation of preprocessing
/// arguments that is shared with gcc.
static void CheckPreprocessingOptions(const Driver &D, const ArgList &Args) {
if (Arg *A = Args.getLastArg(options::OPT_C, options::OPT_CC)) {
if (!Args.hasArg(options::OPT_E) && !Args.hasArg(options::OPT__SLASH_P) &&
!Args.hasArg(options::OPT__SLASH_EP) && !D.CCCIsCPP()) {
D.Diag(diag::err_drv_argument_only_allowed_with)
<< A->getBaseArg().getAsString(Args)
<< (D.IsCLMode() ? "/E, /P or /EP" : "-E");
}
}
}
/// CheckCodeGenerationOptions - Perform some validation of code generation
/// arguments that is shared with gcc.
static void CheckCodeGenerationOptions(const Driver &D, const ArgList &Args) {
// In gcc, only ARM checks this, but it seems reasonable to check universally.
if (Args.hasArg(options::OPT_static))
if (const Arg *A = Args.getLastArg(options::OPT_dynamic,
options::OPT_mdynamic_no_pic))
D.Diag(diag::err_drv_argument_not_allowed_with)
<< A->getAsString(Args) << "-static";
}
// Add backslashes to escape spaces and other backslashes.
// This is used for the space-separated argument list specified with
// the -dwarf-debug-flags option.
static void EscapeSpacesAndBackslashes(const char *Arg,
SmallVectorImpl<char> &Res) {
for ( ; *Arg; ++Arg) {
switch (*Arg) {
default: break;
case ' ':
case '\\':
Res.push_back('\\');
break;
}
Res.push_back(*Arg);
}
}
// Quote target names for inclusion in GNU Make dependency files.
// Only the characters '$', '#', ' ', '\t' are quoted.
static void QuoteTarget(StringRef Target,
SmallVectorImpl<char> &Res) {
for (unsigned i = 0, e = Target.size(); i != e; ++i) {
switch (Target[i]) {
case ' ':
case '\t':
// Escape the preceding backslashes
for (int j = i - 1; j >= 0 && Target[j] == '\\'; --j)
Res.push_back('\\');
// Escape the space/tab
Res.push_back('\\');
break;
case '$':
Res.push_back('$');
break;
case '#':
Res.push_back('\\');
break;
default:
break;
}
Res.push_back(Target[i]);
}
}
static void addDirectoryList(const ArgList &Args,
ArgStringList &CmdArgs,
const char *ArgName,
const char *EnvVar) {
const char *DirList = ::getenv(EnvVar);
bool CombinedArg = false;
if (!DirList)
return; // Nothing to do.
StringRef Name(ArgName);
if (Name.equals("-I") || Name.equals("-L"))
CombinedArg = true;
StringRef Dirs(DirList);
if (Dirs.empty()) // Empty string should not add '.'.
return;
StringRef::size_type Delim;
while ((Delim = Dirs.find(llvm::sys::EnvPathSeparator)) != StringRef::npos) {
if (Delim == 0) { // Leading colon.
if (CombinedArg) {
CmdArgs.push_back(Args.MakeArgString(std::string(ArgName) + "."));
} else {
CmdArgs.push_back(ArgName);
CmdArgs.push_back(".");
}
} else {
if (CombinedArg) {
CmdArgs.push_back(Args.MakeArgString(std::string(ArgName) + Dirs.substr(0, Delim)));
} else {
CmdArgs.push_back(ArgName);
CmdArgs.push_back(Args.MakeArgString(Dirs.substr(0, Delim)));
}
}
Dirs = Dirs.substr(Delim + 1);
}
if (Dirs.empty()) { // Trailing colon.
if (CombinedArg) {
CmdArgs.push_back(Args.MakeArgString(std::string(ArgName) + "."));
} else {
CmdArgs.push_back(ArgName);
CmdArgs.push_back(".");
}
} else { // Add the last path.
if (CombinedArg) {
CmdArgs.push_back(Args.MakeArgString(std::string(ArgName) + Dirs));
} else {
CmdArgs.push_back(ArgName);
CmdArgs.push_back(Args.MakeArgString(Dirs));
}
}
}
static void AddLinkerInputs(const ToolChain &TC,
const InputInfoList &Inputs, const ArgList &Args,
ArgStringList &CmdArgs) {
const Driver &D = TC.getDriver();
// Add extra linker input arguments which are not treated as inputs
// (constructed via -Xarch_).
Args.AddAllArgValues(CmdArgs, options::OPT_Zlinker_input);
for (const auto &II : Inputs) {
if (!TC.HasNativeLLVMSupport()) {
// Don't try to pass LLVM inputs unless we have native support.
if (II.getType() == types::TY_LLVM_IR ||
II.getType() == types::TY_LTO_IR ||
II.getType() == types::TY_LLVM_BC ||
II.getType() == types::TY_LTO_BC)
D.Diag(diag::err_drv_no_linker_llvm_support)
<< TC.getTripleString();
}
// Add filenames immediately.
if (II.isFilename()) {
CmdArgs.push_back(II.getFilename());
continue;
}
// Otherwise, this is a linker input argument.
const Arg &A = II.getInputArg();
// Handle reserved library options.
if (A.getOption().matches(options::OPT_Z_reserved_lib_stdcxx))
TC.AddCXXStdlibLibArgs(Args, CmdArgs);
else if (A.getOption().matches(options::OPT_Z_reserved_lib_cckext))
TC.AddCCKextLibArgs(Args, CmdArgs);
else if (A.getOption().matches(options::OPT_z)) {
// Pass -z prefix for gcc linker compatibility.
A.claim();
A.render(Args, CmdArgs);
} else {
A.renderAsInput(Args, CmdArgs);
}
}
// LIBRARY_PATH - included following the user specified library paths.
// and only supported on native toolchains.
if (!TC.isCrossCompiling())
addDirectoryList(Args, CmdArgs, "-L", "LIBRARY_PATH");
}
/// \brief Determine whether Objective-C automated reference counting is
/// enabled.
static bool isObjCAutoRefCount(const ArgList &Args) {
return Args.hasFlag(options::OPT_fobjc_arc, options::OPT_fno_objc_arc, false);
}
/// \brief Determine whether we are linking the ObjC runtime.
static bool isObjCRuntimeLinked(const ArgList &Args) {
if (isObjCAutoRefCount(Args)) {
Args.ClaimAllArgs(options::OPT_fobjc_link_runtime);
return true;
}
return Args.hasArg(options::OPT_fobjc_link_runtime);
}
static bool forwardToGCC(const Option &O) {
// Don't forward inputs from the original command line. They are added from
// InputInfoList.
return O.getKind() != Option::InputClass &&
!O.hasFlag(options::DriverOption) &&
!O.hasFlag(options::LinkerInput);
}
void Clang::AddPreprocessingOptions(Compilation &C,
const JobAction &JA,
const Driver &D,
const ArgList &Args,
ArgStringList &CmdArgs,
const InputInfo &Output,
const InputInfoList &Inputs) const {
Arg *A;
CheckPreprocessingOptions(D, Args);
Args.AddLastArg(CmdArgs, options::OPT_C);
Args.AddLastArg(CmdArgs, options::OPT_CC);
// Handle dependency file generation.
if ((A = Args.getLastArg(options::OPT_M, options::OPT_MM)) ||
(A = Args.getLastArg(options::OPT_MD)) ||
(A = Args.getLastArg(options::OPT_MMD))) {
// Determine the output location.
const char *DepFile;
if (Arg *MF = Args.getLastArg(options::OPT_MF)) {
DepFile = MF->getValue();
C.addFailureResultFile(DepFile, &JA);
} else if (Output.getType() == types::TY_Dependencies) {
DepFile = Output.getFilename();
} else if (A->getOption().matches(options::OPT_M) ||
A->getOption().matches(options::OPT_MM)) {
DepFile = "-";
} else {
DepFile = getDependencyFileName(Args, Inputs);
C.addFailureResultFile(DepFile, &JA);
}
CmdArgs.push_back("-dependency-file");
CmdArgs.push_back(DepFile);
// Add a default target if one wasn't specified.
if (!Args.hasArg(options::OPT_MT) && !Args.hasArg(options::OPT_MQ)) {
const char *DepTarget;
// If user provided -o, that is the dependency target, except
// when we are only generating a dependency file.
Arg *OutputOpt = Args.getLastArg(options::OPT_o);
if (OutputOpt && Output.getType() != types::TY_Dependencies) {
DepTarget = OutputOpt->getValue();
} else {
// Otherwise derive from the base input.
//
// FIXME: This should use the computed output file location.
SmallString<128> P(Inputs[0].getBaseInput());
llvm::sys::path::replace_extension(P, "o");
DepTarget = Args.MakeArgString(llvm::sys::path::filename(P));
}
CmdArgs.push_back("-MT");
SmallString<128> Quoted;
QuoteTarget(DepTarget, Quoted);
CmdArgs.push_back(Args.MakeArgString(Quoted));
}
if (A->getOption().matches(options::OPT_M) ||
A->getOption().matches(options::OPT_MD))
CmdArgs.push_back("-sys-header-deps");
if ((isa<PrecompileJobAction>(JA) &&
!Args.hasArg(options::OPT_fno_module_file_deps)) ||
Args.hasArg(options::OPT_fmodule_file_deps))
CmdArgs.push_back("-module-file-deps");
}
if (Args.hasArg(options::OPT_MG)) {
if (!A || A->getOption().matches(options::OPT_MD) ||
A->getOption().matches(options::OPT_MMD))
D.Diag(diag::err_drv_mg_requires_m_or_mm);
CmdArgs.push_back("-MG");
}
Args.AddLastArg(CmdArgs, options::OPT_MP);
Args.AddLastArg(CmdArgs, options::OPT_MV);
// Convert all -MQ <target> args to -MT <quoted target>
for (const Arg *A : Args.filtered(options::OPT_MT, options::OPT_MQ)) {
A->claim();
if (A->getOption().matches(options::OPT_MQ)) {
CmdArgs.push_back("-MT");
SmallString<128> Quoted;
QuoteTarget(A->getValue(), Quoted);
CmdArgs.push_back(Args.MakeArgString(Quoted));
// -MT flag - no change
} else {
A->render(Args, CmdArgs);
}
}
// Add -i* options, and automatically translate to
// -include-pch/-include-pth for transparent PCH support. It's
// wonky, but we include looking for .gch so we can support seamless
// replacement into a build system already set up to be generating
// .gch files.
bool RenderedImplicitInclude = false;
for (const Arg *A : Args.filtered(options::OPT_clang_i_Group)) {
if (A->getOption().matches(options::OPT_include)) {
bool IsFirstImplicitInclude = !RenderedImplicitInclude;
RenderedImplicitInclude = true;
// Use PCH if the user requested it.
bool UsePCH = D.CCCUsePCH;
bool FoundPTH = false;
bool FoundPCH = false;
SmallString<128> P(A->getValue());
// We want the files to have a name like foo.h.pch. Add a dummy extension
// so that replace_extension does the right thing.
P += ".dummy";
if (UsePCH) {
llvm::sys::path::replace_extension(P, "pch");
if (llvm::sys::fs::exists(P))
FoundPCH = true;
}
if (!FoundPCH) {
llvm::sys::path::replace_extension(P, "pth");
if (llvm::sys::fs::exists(P))
FoundPTH = true;
}
if (!FoundPCH && !FoundPTH) {
llvm::sys::path::replace_extension(P, "gch");
if (llvm::sys::fs::exists(P)) {
FoundPCH = UsePCH;
FoundPTH = !UsePCH;
}
}
if (FoundPCH || FoundPTH) {
if (IsFirstImplicitInclude) {
A->claim();
if (UsePCH)
CmdArgs.push_back("-include-pch");
else
CmdArgs.push_back("-include-pth");
CmdArgs.push_back(Args.MakeArgString(P));
continue;
} else {
// Ignore the PCH if not first on command line and emit warning.
D.Diag(diag::warn_drv_pch_not_first_include)
<< P << A->getAsString(Args);
}
}
}
// Not translated, render as usual.
A->claim();
A->render(Args, CmdArgs);
}
Args.AddAllArgs(CmdArgs, options::OPT_D, options::OPT_U);
Args.AddAllArgs(CmdArgs, options::OPT_I_Group, options::OPT_F,
options::OPT_index_header_map);
// Add -Wp, and -Xassembler if using the preprocessor.
// FIXME: There is a very unfortunate problem here, some troubled
// souls abuse -Wp, to pass preprocessor options in gcc syntax. To
// really support that we would have to parse and then translate
// those options. :(
Args.AddAllArgValues(CmdArgs, options::OPT_Wp_COMMA,
options::OPT_Xpreprocessor);
// -I- is a deprecated GCC feature, reject it.
if (Arg *A = Args.getLastArg(options::OPT_I_))
D.Diag(diag::err_drv_I_dash_not_supported) << A->getAsString(Args);
// If we have a --sysroot, and don't have an explicit -isysroot flag, add an
// -isysroot to the CC1 invocation.
StringRef sysroot = C.getSysRoot();
if (sysroot != "") {
if (!Args.hasArg(options::OPT_isysroot)) {
CmdArgs.push_back("-isysroot");
CmdArgs.push_back(C.getArgs().MakeArgString(sysroot));
}
}
// Parse additional include paths from environment variables.
// FIXME: We should probably sink the logic for handling these from the
// frontend into the driver. It will allow deleting 4 otherwise unused flags.
// CPATH - included following the user specified includes (but prior to
// builtin and standard includes).
addDirectoryList(Args, CmdArgs, "-I", "CPATH");
// C_INCLUDE_PATH - system includes enabled when compiling C.
addDirectoryList(Args, CmdArgs, "-c-isystem", "C_INCLUDE_PATH");
// CPLUS_INCLUDE_PATH - system includes enabled when compiling C++.
addDirectoryList(Args, CmdArgs, "-cxx-isystem", "CPLUS_INCLUDE_PATH");
// OBJC_INCLUDE_PATH - system includes enabled when compiling ObjC.
addDirectoryList(Args, CmdArgs, "-objc-isystem", "OBJC_INCLUDE_PATH");
// OBJCPLUS_INCLUDE_PATH - system includes enabled when compiling ObjC++.
addDirectoryList(Args, CmdArgs, "-objcxx-isystem", "OBJCPLUS_INCLUDE_PATH");
// Add C++ include arguments, if needed.
if (types::isCXX(Inputs[0].getType()))
getToolChain().AddClangCXXStdlibIncludeArgs(Args, CmdArgs);
// Add system include arguments.
getToolChain().AddClangSystemIncludeArgs(Args, CmdArgs);
}
// FIXME: Move to target hook.
static bool isSignedCharDefault(const llvm::Triple &Triple) {
switch (Triple.getArch()) {
default:
return true;
case llvm::Triple::aarch64:
case llvm::Triple::aarch64_be:
case llvm::Triple::arm:
case llvm::Triple::armeb:
case llvm::Triple::thumb:
case llvm::Triple::thumbeb:
if (Triple.isOSDarwin() || Triple.isOSWindows())
return true;
return false;
case llvm::Triple::ppc:
case llvm::Triple::ppc64:
if (Triple.isOSDarwin())
return true;
return false;
case llvm::Triple::hexagon:
case llvm::Triple::ppc64le:
case llvm::Triple::systemz:
case llvm::Triple::xcore:
return false;
}
}
static bool isNoCommonDefault(const llvm::Triple &Triple) {
switch (Triple.getArch()) {
default:
return false;
case llvm::Triple::xcore:
return true;
}
}
// Handle -mhwdiv=.
static void getARMHWDivFeatures(const Driver &D, const Arg *A,
const ArgList &Args,
std::vector<const char *> &Features) {
StringRef HWDiv = A->getValue();
if (HWDiv == "arm") {
Features.push_back("+hwdiv-arm");
Features.push_back("-hwdiv");
} else if (HWDiv == "thumb") {
Features.push_back("-hwdiv-arm");
Features.push_back("+hwdiv");
} else if (HWDiv == "arm,thumb" || HWDiv == "thumb,arm") {
Features.push_back("+hwdiv-arm");
Features.push_back("+hwdiv");
} else if (HWDiv == "none") {
Features.push_back("-hwdiv-arm");
Features.push_back("-hwdiv");
} else
D.Diag(diag::err_drv_clang_unsupported) << A->getAsString(Args);
}
// Handle -mfpu=.
static void getARMFPUFeatures(const Driver &D, const Arg *A,
const ArgList &Args,
std::vector<const char *> &Features) {
StringRef FPU = A->getValue();
unsigned FPUID = llvm::ARMTargetParser::parseFPU(FPU);
if (!llvm::ARMTargetParser::getFPUFeatures(FPUID, Features))
D.Diag(diag::err_drv_clang_unsupported) << A->getAsString(Args);
}
static int getARMSubArchVersionNumber(const llvm::Triple &Triple) {
llvm::StringRef Arch = Triple.getArchName();
return llvm::ARMTargetParser::parseArchVersion(Arch);
}
static bool isARMMProfile(const llvm::Triple &Triple) {
llvm::StringRef Arch = Triple.getArchName();
unsigned Profile = llvm::ARMTargetParser::parseArchProfile(Arch);
return Profile == llvm::ARM::PK_M;
}
// Select the float ABI as determined by -msoft-float, -mhard-float, and
// -mfloat-abi=.
StringRef tools::arm::getARMFloatABI(const Driver &D, const ArgList &Args,
const llvm::Triple &Triple) {
StringRef FloatABI;
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))
FloatABI = "soft";
else if (A->getOption().matches(options::OPT_mhard_float))
FloatABI = "hard";
else {
FloatABI = A->getValue();
if (FloatABI != "soft" && FloatABI != "softfp" && FloatABI != "hard") {
D.Diag(diag::err_drv_invalid_mfloat_abi)
<< A->getAsString(Args);
FloatABI = "soft";
}
}
}
// If unspecified, choose the default based on the platform.
if (FloatABI.empty()) {
switch (Triple.getOS()) {
case llvm::Triple::Darwin:
case llvm::Triple::MacOSX:
case llvm::Triple::IOS: {
// Darwin defaults to "softfp" for v6 and v7.
//
if (getARMSubArchVersionNumber(Triple) == 6 ||
getARMSubArchVersionNumber(Triple) == 7)
FloatABI = "softfp";
else
FloatABI = "soft";
break;
}
// FIXME: this is invalid for WindowsCE
case llvm::Triple::Win32:
FloatABI = "hard";
break;
case llvm::Triple::FreeBSD:
switch(Triple.getEnvironment()) {
case llvm::Triple::GNUEABIHF:
FloatABI = "hard";
break;
default:
// FreeBSD defaults to soft float
FloatABI = "soft";
break;
}
break;
default:
switch(Triple.getEnvironment()) {
case llvm::Triple::GNUEABIHF:
FloatABI = "hard";
break;
case llvm::Triple::GNUEABI:
FloatABI = "softfp";
break;
case llvm::Triple::EABIHF:
FloatABI = "hard";
break;
case llvm::Triple::EABI:
// EABI is always AAPCS, and if it was not marked 'hard', it's softfp
FloatABI = "softfp";
break;
case llvm::Triple::Android: {
if (getARMSubArchVersionNumber(Triple) == 7)
FloatABI = "softfp";
else
FloatABI = "soft";
break;
}
default:
// Assume "soft", but warn the user we are guessing.
FloatABI = "soft";
if (Triple.getOS() != llvm::Triple::UnknownOS ||
!Triple.isOSBinFormatMachO())
D.Diag(diag::warn_drv_assuming_mfloat_abi_is) << "soft";
break;
}
}
}
return FloatABI;
}
static void getARMTargetFeatures(const Driver &D, const llvm::Triple &Triple,
const ArgList &Args,
std::vector<const char *> &Features,
bool ForAS) {
StringRef FloatABI = tools::arm::getARMFloatABI(D, Args, Triple);
if (!ForAS) {
// FIXME: Note, this is a hack, the LLVM backend doesn't actually use these
// yet (it uses the -mfloat-abi and -msoft-float options), and it is
// stripped out by the ARM target. We should probably pass this a new
// -target-option, which is handled by the -cc1/-cc1as invocation.
//
// FIXME2: For consistency, it would be ideal if we set up the target
// machine state the same when using the frontend or the assembler. We don't
// currently do that for the assembler, we pass the options directly to the
// backend and never even instantiate the frontend TargetInfo. If we did,
// and used its handleTargetFeatures hook, then we could ensure the
// assembler and the frontend behave the same.
// Use software floating point operations?
if (FloatABI == "soft")
Features.push_back("+soft-float");
// Use software floating point argument passing?
if (FloatABI != "hard")
Features.push_back("+soft-float-abi");
}
// Honor -mfpu=.
if (const Arg *A = Args.getLastArg(options::OPT_mfpu_EQ))
getARMFPUFeatures(D, A, Args, Features);
if (const Arg *A = Args.getLastArg(options::OPT_mhwdiv_EQ))
getARMHWDivFeatures(D, A, Args, Features);
// Check if -march is valid by checking if it can be canonicalised and parsed.
// getARMArch is used here instead of just checking the -march value in order
// to handle -march=native correctly.
if (const Arg *A = Args.getLastArg(options::OPT_march_EQ)) {
std::string Arch = arm::getARMArch(Args, Triple);
if (llvm::ARMTargetParser::parseArch(Arch) == llvm::ARM::AK_INVALID)
D.Diag(diag::err_drv_clang_unsupported) << A->getAsString(Args);
}
// We do a similar thing with -mcpu, but here things are complicated because
// the only function we have to check if a cpu is valid is
// getLLVMArchSuffixForARM which also needs an architecture.
if (const Arg *A = Args.getLastArg(options::OPT_mcpu_EQ)) {
std::string CPU = arm::getARMTargetCPU(Args, Triple);
std::string Arch = arm::getARMArch(Args, Triple);
if (strcmp(arm::getLLVMArchSuffixForARM(CPU, Arch), "") == 0)
D.Diag(diag::err_drv_clang_unsupported) << A->getAsString(Args);
}
// Setting -msoft-float effectively disables NEON because of the GCC
// implementation, although the same isn't true of VFP or VFP3.
if (FloatABI == "soft") {
Features.push_back("-neon");
// Also need to explicitly disable features which imply NEON.
Features.push_back("-crypto");
}
// En/disable crc code generation.
if (Arg *A = Args.getLastArg(options::OPT_mcrc, options::OPT_mnocrc)) {
if (A->getOption().matches(options::OPT_mcrc))
Features.push_back("+crc");
else
Features.push_back("-crc");
}
if (Triple.getSubArch() == llvm::Triple::SubArchType::ARMSubArch_v8_1a) {
Features.insert(Features.begin(), "+v8.1a");
}
}
void Clang::AddARMTargetArgs(const ArgList &Args,
ArgStringList &CmdArgs,
bool KernelOrKext) const {
const Driver &D = getToolChain().getDriver();
// Get the effective triple, which takes into account the deployment target.
std::string TripleStr = getToolChain().ComputeEffectiveClangTriple(Args);
llvm::Triple Triple(TripleStr);
// Select the ABI to use.
//
// FIXME: Support -meabi.
// FIXME: Parts of this are duplicated in the backend, unify this somehow.
const char *ABIName = nullptr;
if (Arg *A = Args.getLastArg(options::OPT_mabi_EQ)) {
ABIName = A->getValue();
} else if (Triple.isOSBinFormatMachO()) {
// The backend is hardwired to assume AAPCS for M-class processors, ensure
// the frontend matches that.
if (Triple.getEnvironment() == llvm::Triple::EABI ||
Triple.getOS() == llvm::Triple::UnknownOS ||
isARMMProfile(Triple)) {
ABIName = "aapcs";
} else {
ABIName = "apcs-gnu";
}
} else if (Triple.isOSWindows()) {
// FIXME: this is invalid for WindowsCE
ABIName = "aapcs";
} else {
// Select the default based on the platform.
switch(Triple.getEnvironment()) {
case llvm::Triple::Android:
case llvm::Triple::GNUEABI:
case llvm::Triple::GNUEABIHF:
ABIName = "aapcs-linux";
break;
case llvm::Triple::EABIHF:
case llvm::Triple::EABI:
ABIName = "aapcs";
break;
default:
if (Triple.getOS() == llvm::Triple::NetBSD)
ABIName = "apcs-gnu";
else
ABIName = "aapcs";
break;
}
}
CmdArgs.push_back("-target-abi");
CmdArgs.push_back(ABIName);
// Determine floating point ABI from the options & target defaults.
StringRef FloatABI = tools::arm::getARMFloatABI(D, Args, Triple);
if (FloatABI == "soft") {
// Floating point operations and argument passing are soft.
//
// FIXME: This changes CPP defines, we need -target-soft-float.
CmdArgs.push_back("-msoft-float");
CmdArgs.push_back("-mfloat-abi");
CmdArgs.push_back("soft");
} else if (FloatABI == "softfp") {
// Floating point operations are hard, but argument passing is soft.
CmdArgs.push_back("-mfloat-abi");
CmdArgs.push_back("soft");
} else {
// Floating point operations and argument passing are hard.
assert(FloatABI == "hard" && "Invalid float abi!");
CmdArgs.push_back("-mfloat-abi");
CmdArgs.push_back("hard");
}
// Kernel code has more strict alignment requirements.
if (KernelOrKext) {
if (!Triple.isiOS() || Triple.isOSVersionLT(6)) {
CmdArgs.push_back("-backend-option");
CmdArgs.push_back("-arm-long-calls");
}
CmdArgs.push_back("-backend-option");
CmdArgs.push_back("-arm-strict-align");
// The kext linker doesn't know how to deal with movw/movt.
CmdArgs.push_back("-backend-option");
CmdArgs.push_back("-arm-use-movt=0");
}
// -mkernel implies -mstrict-align; don't add the redundant option.
if (!KernelOrKext) {
if (Arg *A = Args.getLastArg(options::OPT_mno_unaligned_access,
options::OPT_munaligned_access)) {
CmdArgs.push_back("-backend-option");
if (A->getOption().matches(options::OPT_mno_unaligned_access))
CmdArgs.push_back("-arm-strict-align");
else {
if (Triple.getSubArch() == llvm::Triple::SubArchType::ARMSubArch_v6m)
D.Diag(diag::err_target_unsupported_unaligned) << "v6m";
CmdArgs.push_back("-arm-no-strict-align");
}
}
}
// Forward the -mglobal-merge option for explicit control over the pass.
if (Arg *A = Args.getLastArg(options::OPT_mglobal_merge,
options::OPT_mno_global_merge)) {
CmdArgs.push_back("-backend-option");
if (A->getOption().matches(options::OPT_mno_global_merge))
CmdArgs.push_back("-arm-global-merge=false");
else
CmdArgs.push_back("-arm-global-merge=true");
}
if (!Args.hasFlag(options::OPT_mimplicit_float,
options::OPT_mno_implicit_float,
true))
CmdArgs.push_back("-no-implicit-float");
// llvm does not support reserving registers in general. There is support
// for reserving r9 on ARM though (defined as a platform-specific register
// in ARM EABI).
if (Args.hasArg(options::OPT_ffixed_r9)) {
CmdArgs.push_back("-backend-option");
CmdArgs.push_back("-arm-reserve-r9");
}
}
/// getAArch64TargetCPU - Get the (LLVM) name of the AArch64 cpu we are
/// targeting.
static std::string getAArch64TargetCPU(const ArgList &Args) {
Arg *A;
std::string CPU;
// If we have -mtune or -mcpu, use that.
if ((A = Args.getLastArg(options::OPT_mtune_EQ))) {
CPU = A->getValue();
} else if ((A = Args.getLastArg(options::OPT_mcpu_EQ))) {
StringRef Mcpu = A->getValue();
CPU = Mcpu.split("+").first.lower();
}
// Handle CPU name is 'native'.
if (CPU == "native")
return llvm::sys::getHostCPUName();
else if (CPU.size())
return CPU;
// Make sure we pick "cyclone" if -arch is used.
// FIXME: Should this be picked by checking the target triple instead?
if (Args.getLastArg(options::OPT_arch))
return "cyclone";
return "generic";
}
void Clang::AddAArch64TargetArgs(const ArgList &Args,
ArgStringList &CmdArgs) const {
std::string TripleStr = getToolChain().ComputeEffectiveClangTriple(Args);
llvm::Triple Triple(TripleStr);
if (!Args.hasFlag(options::OPT_mred_zone, options::OPT_mno_red_zone, true) ||
Args.hasArg(options::OPT_mkernel) ||
Args.hasArg(options::OPT_fapple_kext))
CmdArgs.push_back("-disable-red-zone");
if (!Args.hasFlag(options::OPT_mimplicit_float,
options::OPT_mno_implicit_float, true))
CmdArgs.push_back("-no-implicit-float");
const char *ABIName = nullptr;
if (Arg *A = Args.getLastArg(options::OPT_mabi_EQ))
ABIName = A->getValue();
else if (Triple.isOSDarwin())
ABIName = "darwinpcs";
else
ABIName = "aapcs";
CmdArgs.push_back("-target-abi");
CmdArgs.push_back(ABIName);
if (Arg *A = Args.getLastArg(options::OPT_mno_unaligned_access,
options::OPT_munaligned_access)) {
CmdArgs.push_back("-backend-option");
if (A->getOption().matches(options::OPT_mno_unaligned_access))
CmdArgs.push_back("-aarch64-strict-align");
else
CmdArgs.push_back("-aarch64-no-strict-align");
}
if (Arg *A = Args.getLastArg(options::OPT_mfix_cortex_a53_835769,
options::OPT_mno_fix_cortex_a53_835769)) {
CmdArgs.push_back("-backend-option");
if (A->getOption().matches(options::OPT_mfix_cortex_a53_835769))
CmdArgs.push_back("-aarch64-fix-cortex-a53-835769=1");
else
CmdArgs.push_back("-aarch64-fix-cortex-a53-835769=0");
} else if (Triple.getEnvironment() == llvm::Triple::Android) {
// Enabled A53 errata (835769) workaround by default on android
CmdArgs.push_back("-backend-option");
CmdArgs.push_back("-aarch64-fix-cortex-a53-835769=1");
}
// Forward the -mglobal-merge option for explicit control over the pass.
if (Arg *A = Args.getLastArg(options::OPT_mglobal_merge,
options::OPT_mno_global_merge)) {
CmdArgs.push_back("-backend-option");
if (A->getOption().matches(options::OPT_mno_global_merge))
CmdArgs.push_back("-aarch64-global-merge=false");
else
CmdArgs.push_back("-aarch64-global-merge=true");
}
if (Args.hasArg(options::OPT_ffixed_x18)) {
CmdArgs.push_back("-backend-option");
CmdArgs.push_back("-aarch64-reserve-x18");
}
}
// Get CPU and ABI names. They are not independent
// so we have to calculate them together.
void mips::getMipsCPUAndABI(const ArgList &Args,
const llvm::Triple &Triple,
StringRef &CPUName,
StringRef &ABIName) {
const char *DefMips32CPU = "mips32r2";
const char *DefMips64CPU = "mips64r2";
// MIPS32r6 is the default for mips(el)?-img-linux-gnu and MIPS64r6 is the
// default for mips64(el)?-img-linux-gnu.
if (Triple.getVendor() == llvm::Triple::ImaginationTechnologies &&
Triple.getEnvironment() == llvm::Triple::GNU) {
DefMips32CPU = "mips32r6";
DefMips64CPU = "mips64r6";
}
// MIPS3 is the default for mips64*-unknown-openbsd.
if (Triple.getOS() == llvm::Triple::OpenBSD)
DefMips64CPU = "mips3";
if (Arg *A = Args.getLastArg(options::OPT_march_EQ,
options::OPT_mcpu_EQ))
CPUName = A->getValue();
if (Arg *A = Args.getLastArg(options::OPT_mabi_EQ)) {
ABIName = A->getValue();
// Convert a GNU style Mips ABI name to the name
// accepted by LLVM Mips backend.
ABIName = llvm::StringSwitch<llvm::StringRef>(ABIName)
.Case("32", "o32")
.Case("64", "n64")
.Default(ABIName);
}
// Setup default CPU and ABI names.
if (CPUName.empty() && ABIName.empty()) {
switch (Triple.getArch()) {
default:
llvm_unreachable("Unexpected triple arch name");
case llvm::Triple::mips:
case llvm::Triple::mipsel:
CPUName = DefMips32CPU;
break;
case llvm::Triple::mips64:
case llvm::Triple::mips64el:
CPUName = DefMips64CPU;
break;
}
}
if (ABIName.empty()) {
// Deduce ABI name from the target triple.
if (Triple.getArch() == llvm::Triple::mips ||
Triple.getArch() == llvm::Triple::mipsel)
ABIName = "o32";
else
ABIName = "n64";
}
if (CPUName.empty()) {
// Deduce CPU name from ABI name.
CPUName = llvm::StringSwitch<const char *>(ABIName)
.Cases("o32", "eabi", DefMips32CPU)
.Cases("n32", "n64", DefMips64CPU)
.Default("");
}