static std::pair<StringRef, clang::VersionTuple>
getOSAndVersionForDiagnostics(const llvm::Triple &triple) {
StringRef osName;
unsigned major, minor, micro;
if (triple.isMacOSX()) {
// macOS triples represent their versions differently, so we have to use the
// special accessor.
triple.getMacOSXVersion(major, minor, micro);
osName = swift::prettyPlatformString(PlatformKind::OSX);
} else {
triple.getOSVersion(major, minor, micro);
if (triple.isWatchOS()) {
osName = swift::prettyPlatformString(PlatformKind::watchOS);
} else if (triple.isTvOS()) {
assert(triple.isiOS() &&
"LLVM treats tvOS as a kind of iOS, so tvOS is checked first");
osName = swift::prettyPlatformString(PlatformKind::tvOS);
} else if (triple.isiOS()) {
osName = swift::prettyPlatformString(PlatformKind::iOS);
} else {
assert(!triple.isOSDarwin() && "unknown Apple OS");
// Fallback to the LLVM triple name. This isn't great (it won't be
// capitalized or anything), but it's better than nothing.
osName = triple.getOSName();
}
}
assert(!osName.empty());
clang::VersionTuple version;
if (micro != 0)
version = clang::VersionTuple(major, minor, micro);
else
version = clang::VersionTuple(major, minor);
return {osName, version};
}
StringRef swift::getPlatformNameForTriple(const llvm::Triple &triple) {
if (triple.isiOS()) {
if (triple.isTvOS()) {
if (tripleIsAppleTVSimulator(triple))
return "appletvsimulator";
return "appletvos";
}
if (tripleIsiOSSimulator(triple))
return "iphonesimulator";
return "iphoneos";
}
if (triple.isWatchOS()) {
if (tripleIsWatchSimulator(triple))
return "watchsimulator";
return "watchos";
}
if (triple.isAndroid()) {
return "android";
}
if (triple.isMacOSX())
return "macosx";
if (triple.isOSLinux())
return "linux";
if (triple.isOSFreeBSD())
return "freebsd";
return "";
}
/// Returns true if the compiler depends on features provided by the ObjC
/// runtime that are not present on the deployment target indicated by
/// \p triple.
static bool wantsObjCRuntime(const llvm::Triple &triple) {
assert((!triple.isTvOS() || triple.isiOS()) &&
"tvOS is considered a kind of iOS");
// When updating the versions listed here, please record the most recent
// feature being depended on and when it was introduced:
//
// - The hook to override class_getImageName (macOS 10.14 and equivalent)
if (triple.isiOS())
return triple.isOSVersionLT(12);
if (triple.isMacOSX())
return triple.isMacOSXVersionLT(10, 14);
if (triple.isWatchOS())
return triple.isOSVersionLT(5);
llvm_unreachable("unknown Darwin OS");
}
/// Returns true if the compiler depends on features provided by the ObjC
/// runtime that are not present on the deployment target indicated by
/// \p triple.
static bool wantsObjCRuntime(const llvm::Triple &triple) {
assert((!triple.isTvOS() || triple.isiOS()) &&
"tvOS is considered a kind of iOS");
// When updating the versions listed here, please record the most recent
// feature being depended on and when it was introduced:
//
// - Make assigning 'nil' to an NSMutableDictionary subscript delete the
// entry, like it does for Swift.Dictionary, rather than trap.
if (triple.isiOS())
return triple.isOSVersionLT(9);
if (triple.isMacOSX())
return triple.isMacOSXVersionLT(10, 11);
if (triple.isWatchOS())
return false;
llvm_unreachable("unknown Darwin OS");
}
DarwinPlatformKind swift::getDarwinPlatformKind(const llvm::Triple &triple) {
if (triple.isiOS()) {
if (triple.isTvOS()) {
if (tripleIsAppleTVSimulator(triple))
return DarwinPlatformKind::TvOSSimulator;
return DarwinPlatformKind::TvOS;
}
if (tripleIsiOSSimulator(triple))
return DarwinPlatformKind::IPhoneOSSimulator;
return DarwinPlatformKind::IPhoneOS;
}
if (triple.isWatchOS()) {
if (tripleIsWatchSimulator(triple))
return DarwinPlatformKind::WatchOSSimulator;
return DarwinPlatformKind::WatchOS;
}
if (triple.isMacOSX())
return DarwinPlatformKind::MacOS;
llvm_unreachable("Unsupported Darwin platform");
}
bool swift::tripleIsiOSSimulator(const llvm::Triple &triple) {
llvm::Triple::ArchType arch = triple.getArch();
return (triple.isiOS() &&
(arch == llvm::Triple::x86 || arch == llvm::Triple::x86_64));
}
std::pair<bool, bool> LangOptions::setTarget(llvm::Triple triple) {
clearAllPlatformConditionValues();
if (triple.getOS() == llvm::Triple::Darwin &&
triple.getVendor() == llvm::Triple::Apple) {
// Rewrite darwinX.Y triples to macosx10.X'.Y ones.
// It affects code generation on our platform.
llvm::SmallString<16> osxBuf;
llvm::raw_svector_ostream osx(osxBuf);
osx << llvm::Triple::getOSTypeName(llvm::Triple::MacOSX);
unsigned major, minor, micro;
triple.getMacOSXVersion(major, minor, micro);
osx << major << "." << minor;
if (micro != 0)
osx << "." << micro;
triple.setOSName(osx.str());
}
Target = std::move(triple);
bool UnsupportedOS = false;
// Set the "os" platform condition.
if (Target.isMacOSX())
addPlatformConditionValue(PlatformConditionKind::OS, "OSX");
else if (triple.isTvOS())
addPlatformConditionValue(PlatformConditionKind::OS, "tvOS");
else if (triple.isWatchOS())
addPlatformConditionValue(PlatformConditionKind::OS, "watchOS");
else if (triple.isiOS())
addPlatformConditionValue(PlatformConditionKind::OS, "iOS");
else if (triple.isAndroid())
addPlatformConditionValue(PlatformConditionKind::OS, "Android");
else if (triple.isOSLinux())
addPlatformConditionValue(PlatformConditionKind::OS, "Linux");
else if (triple.isOSFreeBSD())
addPlatformConditionValue(PlatformConditionKind::OS, "FreeBSD");
else if (triple.isOSWindows())
addPlatformConditionValue(PlatformConditionKind::OS, "Windows");
else if (triple.isWindowsCygwinEnvironment())
addPlatformConditionValue(PlatformConditionKind::OS, "Cygwin");
else if (triple.isPS4())
addPlatformConditionValue(PlatformConditionKind::OS, "PS4");
else
UnsupportedOS = true;
bool UnsupportedArch = false;
// Set the "arch" platform condition.
switch (Target.getArch()) {
case llvm::Triple::ArchType::arm:
case llvm::Triple::ArchType::thumb:
addPlatformConditionValue(PlatformConditionKind::Arch, "arm");
break;
case llvm::Triple::ArchType::aarch64:
addPlatformConditionValue(PlatformConditionKind::Arch, "arm64");
break;
case llvm::Triple::ArchType::ppc64:
addPlatformConditionValue(PlatformConditionKind::Arch, "powerpc64");
break;
case llvm::Triple::ArchType::ppc64le:
addPlatformConditionValue(PlatformConditionKind::Arch, "powerpc64le");
break;
case llvm::Triple::ArchType::x86:
addPlatformConditionValue(PlatformConditionKind::Arch, "i386");
break;
case llvm::Triple::ArchType::x86_64:
addPlatformConditionValue(PlatformConditionKind::Arch, "x86_64");
break;
case llvm::Triple::ArchType::systemz:
addPlatformConditionValue(PlatformConditionKind::Arch, "s390x");
break;
default:
UnsupportedArch = true;
}
if (UnsupportedOS || UnsupportedArch)
return { UnsupportedOS, UnsupportedArch };
// Set the "_endian" platform condition.
switch (Target.getArch()) {
case llvm::Triple::ArchType::arm:
case llvm::Triple::ArchType::thumb:
addPlatformConditionValue(PlatformConditionKind::Endianness, "little");
break;
case llvm::Triple::ArchType::aarch64:
addPlatformConditionValue(PlatformConditionKind::Endianness, "little");
break;
case llvm::Triple::ArchType::ppc64:
addPlatformConditionValue(PlatformConditionKind::Endianness, "big");
break;
case llvm::Triple::ArchType::ppc64le:
addPlatformConditionValue(PlatformConditionKind::Endianness, "little");
break;
case llvm::Triple::ArchType::x86:
addPlatformConditionValue(PlatformConditionKind::Endianness, "little");
break;
case llvm::Triple::ArchType::x86_64:
addPlatformConditionValue(PlatformConditionKind::Endianness, "little");
break;
case llvm::Triple::ArchType::systemz:
addPlatformConditionValue(PlatformConditionKind::Endianness, "big");
break;
default:
llvm_unreachable("undefined architecture endianness");
}
// Set the "runtime" platform condition.
if (EnableObjCInterop)
addPlatformConditionValue(PlatformConditionKind::Runtime, "_ObjC");
else
addPlatformConditionValue(PlatformConditionKind::Runtime, "_Native");
// If you add anything to this list, change the default size of
// PlatformConditionValues to not require an extra allocation
// in the common case.
return { false, false };
}
static bool supportsNilWithFloatRet(const llvm::Triple &triple) {
return (triple.getVendor() == llvm::Triple::Apple &&
(triple.isiOS() || !triple.isMacOSXVersionLT(10,5)));
}
void getDarwinDefines(MacroBuilder &Builder, const LangOptions &Opts,
const llvm::Triple &Triple, StringRef &PlatformName,
VersionTuple &PlatformMinVersion) {
Builder.defineMacro("__APPLE_CC__", "6000");
Builder.defineMacro("__APPLE__");
Builder.defineMacro("__STDC_NO_THREADS__");
Builder.defineMacro("OBJC_NEW_PROPERTIES");
// AddressSanitizer doesn't play well with source fortification, which is on
// by default on Darwin.
if (Opts.Sanitize.has(SanitizerKind::Address))
Builder.defineMacro("_FORTIFY_SOURCE", "0");
// Darwin defines __weak, __strong, and __unsafe_unretained even in C mode.
if (!Opts.ObjC) {
// __weak is always defined, for use in blocks and with objc pointers.
Builder.defineMacro("__weak", "__attribute__((objc_gc(weak)))");
Builder.defineMacro("__strong", "");
Builder.defineMacro("__unsafe_unretained", "");
}
if (Opts.Static)
Builder.defineMacro("__STATIC__");
else
Builder.defineMacro("__DYNAMIC__");
if (Opts.POSIXThreads)
Builder.defineMacro("_REENTRANT");
// Get the platform type and version number from the triple.
unsigned Maj, Min, Rev;
if (Triple.isMacOSX()) {
Triple.getMacOSXVersion(Maj, Min, Rev);
PlatformName = "macos";
} else {
Triple.getOSVersion(Maj, Min, Rev);
PlatformName = llvm::Triple::getOSTypeName(Triple.getOS());
}
// If -target arch-pc-win32-macho option specified, we're
// generating code for Win32 ABI. No need to emit
// __ENVIRONMENT_XX_OS_VERSION_MIN_REQUIRED__.
if (PlatformName == "win32") {
PlatformMinVersion = VersionTuple(Maj, Min, Rev);
return;
}
// Set the appropriate OS version define.
if (Triple.isiOS()) {
assert(Maj < 100 && Min < 100 && Rev < 100 && "Invalid version!");
char Str[7];
if (Maj < 10) {
Str[0] = '0' + Maj;
Str[1] = '0' + (Min / 10);
Str[2] = '0' + (Min % 10);
Str[3] = '0' + (Rev / 10);
Str[4] = '0' + (Rev % 10);
Str[5] = '\0';
} else {
// Handle versions >= 10.
Str[0] = '0' + (Maj / 10);
Str[1] = '0' + (Maj % 10);
Str[2] = '0' + (Min / 10);
Str[3] = '0' + (Min % 10);
Str[4] = '0' + (Rev / 10);
Str[5] = '0' + (Rev % 10);
Str[6] = '\0';
}
if (Triple.isTvOS())
Builder.defineMacro("__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__", Str);
else
Builder.defineMacro("__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__",
Str);
} else if (Triple.isWatchOS()) {
assert(Maj < 10 && Min < 100 && Rev < 100 && "Invalid version!");
char Str[6];
Str[0] = '0' + Maj;
Str[1] = '0' + (Min / 10);
Str[2] = '0' + (Min % 10);
Str[3] = '0' + (Rev / 10);
Str[4] = '0' + (Rev % 10);
Str[5] = '\0';
Builder.defineMacro("__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__", Str);
} else if (Triple.isMacOSX()) {
// Note that the Driver allows versions which aren't representable in the
// define (because we only get a single digit for the minor and micro
// revision numbers). So, we limit them to the maximum representable
// version.
assert(Maj < 100 && Min < 100 && Rev < 100 && "Invalid version!");
char Str[7];
if (Maj < 10 || (Maj == 10 && Min < 10)) {
Str[0] = '0' + (Maj / 10);
Str[1] = '0' + (Maj % 10);
Str[2] = '0' + std::min(Min, 9U);
Str[3] = '0' + std::min(Rev, 9U);
Str[4] = '\0';
} else {
// Handle versions > 10.9.
Str[0] = '0' + (Maj / 10);
Str[1] = '0' + (Maj % 10);
Str[2] = '0' + (Min / 10);
Str[3] = '0' + (Min % 10);
Str[4] = '0' + (Rev / 10);
Str[5] = '0' + (Rev % 10);
Str[6] = '\0';
}
Builder.defineMacro("__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__", Str);
}
// Tell users about the kernel if there is one.
if (Triple.isOSDarwin())
Builder.defineMacro("__MACH__");
PlatformMinVersion = VersionTuple(Maj, Min, Rev);
}
std::pair<bool, bool> LangOptions::setTarget(llvm::Triple triple) {
clearAllTargetConfigOptions();
if (triple.getOS() == llvm::Triple::Darwin &&
triple.getVendor() == llvm::Triple::Apple) {
// Rewrite darwinX.Y triples to macosx10.X'.Y ones.
// It affects code generation on our platform.
llvm::SmallString<16> osxBuf;
llvm::raw_svector_ostream osx(osxBuf);
osx << llvm::Triple::getOSTypeName(llvm::Triple::MacOSX);
unsigned major, minor, micro;
triple.getMacOSXVersion(major, minor, micro);
osx << major << "." << minor;
if (micro != 0)
osx << "." << micro;
triple.setOSName(osx.str());
}
Target = std::move(triple);
bool UnsupportedOS = false;
// Set the "os" target configuration.
if (Target.isMacOSX())
addTargetConfigOption("os", "OSX");
else if (triple.isTvOS())
addTargetConfigOption("os", "tvOS");
else if (triple.isWatchOS())
addTargetConfigOption("os", "watchOS");
else if (triple.isiOS())
addTargetConfigOption("os", "iOS");
else if (triple.isOSLinux())
addTargetConfigOption("os", "Linux");
else {
UnsupportedOS = true;
}
bool UnsupportedArch = false;
// Set the "arch" target configuration.
switch (Target.getArch()) {
case llvm::Triple::ArchType::arm:
addTargetConfigOption("arch", "arm");
break;
case llvm::Triple::ArchType::aarch64:
addTargetConfigOption("arch", "arm64");
break;
case llvm::Triple::ArchType::x86:
addTargetConfigOption("arch", "i386");
break;
case llvm::Triple::ArchType::x86_64:
addTargetConfigOption("arch", "x86_64");
break;
default:
UnsupportedArch = true;
}
if (UnsupportedOS || UnsupportedArch)
return { UnsupportedOS, UnsupportedArch };
// Set the "runtime" target configuration.
if (EnableObjCInterop)
addTargetConfigOption("_runtime", "_ObjC");
else
addTargetConfigOption("_runtime", "_Native");
return { false, false };
}
void arm::getARMTargetFeatures(const ToolChain &TC,
const llvm::Triple &Triple,
const ArgList &Args,
ArgStringList &CmdArgs,
std::vector<StringRef> &Features,
bool ForAS) {
const Driver &D = TC.getDriver();
bool KernelOrKext =
Args.hasArg(options::OPT_mkernel, options::OPT_fapple_kext);
arm::FloatABI ABI = arm::getARMFloatABI(TC, Args);
const Arg *WaCPU = nullptr, *WaFPU = nullptr;
const Arg *WaHDiv = nullptr, *WaArch = nullptr;
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 (ABI == arm::FloatABI::Soft)
Features.push_back("+soft-float");
// Use software floating point argument passing?
if (ABI != arm::FloatABI::Hard)
Features.push_back("+soft-float-abi");
} else {
// Here, we make sure that -Wa,-mfpu/cpu/arch/hwdiv will be passed down
// to the assembler correctly.
for (const Arg *A :
Args.filtered(options::OPT_Wa_COMMA, options::OPT_Xassembler)) {
StringRef Value = A->getValue();
if (Value.startswith("-mfpu=")) {
WaFPU = A;
} else if (Value.startswith("-mcpu=")) {
WaCPU = A;
} else if (Value.startswith("-mhwdiv=")) {
WaHDiv = A;
} else if (Value.startswith("-march=")) {
WaArch = A;
}
}
}
// Check -march. ClangAs gives preference to -Wa,-march=.
const Arg *ArchArg = Args.getLastArg(options::OPT_march_EQ);
StringRef ArchName;
if (WaArch) {
if (ArchArg)
D.Diag(clang::diag::warn_drv_unused_argument)
<< ArchArg->getAsString(Args);
ArchName = StringRef(WaArch->getValue()).substr(7);
checkARMArchName(D, WaArch, Args, ArchName, Features, Triple);
// FIXME: Set Arch.
D.Diag(clang::diag::warn_drv_unused_argument) << WaArch->getAsString(Args);
} else if (ArchArg) {
ArchName = ArchArg->getValue();
checkARMArchName(D, ArchArg, Args, ArchName, Features, Triple);
}
// Check -mcpu. ClangAs gives preference to -Wa,-mcpu=.
const Arg *CPUArg = Args.getLastArg(options::OPT_mcpu_EQ);
StringRef CPUName;
if (WaCPU) {
if (CPUArg)
D.Diag(clang::diag::warn_drv_unused_argument)
<< CPUArg->getAsString(Args);
CPUName = StringRef(WaCPU->getValue()).substr(6);
checkARMCPUName(D, WaCPU, Args, CPUName, ArchName, Features, Triple);
} else if (CPUArg) {
CPUName = CPUArg->getValue();
checkARMCPUName(D, CPUArg, Args, CPUName, ArchName, Features, Triple);
}
// Add CPU features for generic CPUs
if (CPUName == "native") {
llvm::StringMap<bool> HostFeatures;
if (llvm::sys::getHostCPUFeatures(HostFeatures))
for (auto &F : HostFeatures)
Features.push_back(
Args.MakeArgString((F.second ? "+" : "-") + F.first()));
} else if (!CPUName.empty()) {
DecodeARMFeaturesFromCPU(D, CPUName, Features);
}
// Honor -mfpu=. ClangAs gives preference to -Wa,-mfpu=.
const Arg *FPUArg = Args.getLastArg(options::OPT_mfpu_EQ);
if (WaFPU) {
if (FPUArg)
D.Diag(clang::diag::warn_drv_unused_argument)
<< FPUArg->getAsString(Args);
getARMFPUFeatures(D, WaFPU, Args, StringRef(WaFPU->getValue()).substr(6),
Features);
} else if (FPUArg) {
getARMFPUFeatures(D, FPUArg, Args, FPUArg->getValue(), Features);
}
// Honor -mhwdiv=. ClangAs gives preference to -Wa,-mhwdiv=.
const Arg *HDivArg = Args.getLastArg(options::OPT_mhwdiv_EQ);
if (WaHDiv) {
if (HDivArg)
D.Diag(clang::diag::warn_drv_unused_argument)
<< HDivArg->getAsString(Args);
getARMHWDivFeatures(D, WaHDiv, Args,
StringRef(WaHDiv->getValue()).substr(8), Features);
} else if (HDivArg)
getARMHWDivFeatures(D, HDivArg, Args, HDivArg->getValue(), Features);
// Setting -msoft-float effectively disables NEON because of the GCC
// implementation, although the same isn't true of VFP or VFP3.
if (ABI == arm::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");
}
// Look for the last occurrence of -mlong-calls or -mno-long-calls. If
// neither options are specified, see if we are compiling for kernel/kext and
// decide whether to pass "+long-calls" based on the OS and its version.
if (Arg *A = Args.getLastArg(options::OPT_mlong_calls,
options::OPT_mno_long_calls)) {
if (A->getOption().matches(options::OPT_mlong_calls))
Features.push_back("+long-calls");
} else if (KernelOrKext && (!Triple.isiOS() || Triple.isOSVersionLT(6)) &&
!Triple.isWatchOS()) {
Features.push_back("+long-calls");
}
// Generate execute-only output (no data access to code sections).
// This only makes sense for the compiler, not for the assembler.
if (!ForAS) {
// Supported only on ARMv6T2 and ARMv7 and above.
// Cannot be combined with -mno-movt or -mlong-calls
if (Arg *A = Args.getLastArg(options::OPT_mexecute_only, options::OPT_mno_execute_only)) {
if (A->getOption().matches(options::OPT_mexecute_only)) {
if (getARMSubArchVersionNumber(Triple) < 7 &&
llvm::ARM::parseArch(Triple.getArchName()) != llvm::ARM::ArchKind::ARMV6T2)
D.Diag(diag::err_target_unsupported_execute_only) << Triple.getArchName();
else if (Arg *B = Args.getLastArg(options::OPT_mno_movt))
D.Diag(diag::err_opt_not_valid_with_opt) << A->getAsString(Args) << B->getAsString(Args);
// Long calls create constant pool entries and have not yet been fixed up
// to play nicely with execute-only. Hence, they cannot be used in
// execute-only code for now
else if (Arg *B = Args.getLastArg(options::OPT_mlong_calls, options::OPT_mno_long_calls)) {
if (B->getOption().matches(options::OPT_mlong_calls))
D.Diag(diag::err_opt_not_valid_with_opt) << A->getAsString(Args) << B->getAsString(Args);
}
Features.push_back("+execute-only");
}
}
}
// Kernel code has more strict alignment requirements.
if (KernelOrKext)
Features.push_back("+strict-align");
else if (Arg *A = Args.getLastArg(options::OPT_mno_unaligned_access,
options::OPT_munaligned_access)) {
if (A->getOption().matches(options::OPT_munaligned_access)) {
// No v6M core supports unaligned memory access (v6M ARM ARM A3.2).
if (Triple.getSubArch() == llvm::Triple::SubArchType::ARMSubArch_v6m)
D.Diag(diag::err_target_unsupported_unaligned) << "v6m";
// v8M Baseline follows on from v6M, so doesn't support unaligned memory
// access either.
else if (Triple.getSubArch() == llvm::Triple::SubArchType::ARMSubArch_v8m_baseline)
D.Diag(diag::err_target_unsupported_unaligned) << "v8m.base";
} else
Features.push_back("+strict-align");
} else {
// Assume pre-ARMv6 doesn't support unaligned accesses.
//
// ARMv6 may or may not support unaligned accesses depending on the
// SCTLR.U bit, which is architecture-specific. We assume ARMv6
// Darwin and NetBSD targets support unaligned accesses, and others don't.
//
// ARMv7 always has SCTLR.U set to 1, but it has a new SCTLR.A bit
// which raises an alignment fault on unaligned accesses. Linux
// defaults this bit to 0 and handles it as a system-wide (not
// per-process) setting. It is therefore safe to assume that ARMv7+
// Linux targets support unaligned accesses. The same goes for NaCl.
//
// The above behavior is consistent with GCC.
int VersionNum = getARMSubArchVersionNumber(Triple);
if (Triple.isOSDarwin() || Triple.isOSNetBSD()) {
if (VersionNum < 6 ||
Triple.getSubArch() == llvm::Triple::SubArchType::ARMSubArch_v6m)
Features.push_back("+strict-align");
} else if (Triple.isOSLinux() || Triple.isOSNaCl()) {
if (VersionNum < 7)
Features.push_back("+strict-align");
} else
Features.push_back("+strict-align");
}
// 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))
Features.push_back("+reserve-r9");
// The kext linker doesn't know how to deal with movw/movt.
if (KernelOrKext || Args.hasArg(options::OPT_mno_movt))
Features.push_back("+no-movt");
if (Args.hasArg(options::OPT_mno_neg_immediates))
Features.push_back("+no-neg-immediates");
}