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//===--- OSTargets.cpp - Implement OS target feature support --------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file implements OS specific TargetInfo types.
//===----------------------------------------------------------------------===//
#include "OSTargets.h"
#include "clang/Basic/MacroBuilder.h"
#include "llvm/ADT/StringRef.h"
using namespace clang;
using namespace clang::targets;
namespace clang {
namespace targets {
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__");
// 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.
VersionTuple OsVersion;
if (Triple.isMacOSX()) {
Triple.getMacOSXVersion(OsVersion);
PlatformName = "macos";
} else {
OsVersion = Triple.getOSVersion();
PlatformName = llvm::Triple::getOSTypeName(Triple.getOS());
if (PlatformName == "ios" && Triple.isMacCatalystEnvironment())
PlatformName = "maccatalyst";
}
// 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 = OsVersion;
return;
}
assert(OsVersion < VersionTuple(100) && "Invalid version!");
char Str[7];
if (Triple.isMacOSX() && OsVersion < VersionTuple(10, 10)) {
Str[0] = '0' + (OsVersion.getMajor() / 10);
Str[1] = '0' + (OsVersion.getMajor() % 10);
Str[2] = '0' + std::min(OsVersion.getMinor().value_or(0), 9U);
Str[3] = '0' + std::min(OsVersion.getSubminor().value_or(0), 9U);
Str[4] = '\0';
} else if (!Triple.isMacOSX() && OsVersion.getMajor() < 10) {
Str[0] = '0' + OsVersion.getMajor();
Str[1] = '0' + (OsVersion.getMinor().value_or(0) / 10);
Str[2] = '0' + (OsVersion.getMinor().value_or(0) % 10);
Str[3] = '0' + (OsVersion.getSubminor().value_or(0) / 10);
Str[4] = '0' + (OsVersion.getSubminor().value_or(0) % 10);
Str[5] = '\0';
} else {
// Handle versions >= 10.
Str[0] = '0' + (OsVersion.getMajor() / 10);
Str[1] = '0' + (OsVersion.getMajor() % 10);
Str[2] = '0' + (OsVersion.getMinor().value_or(0) / 10);
Str[3] = '0' + (OsVersion.getMinor().value_or(0) % 10);
Str[4] = '0' + (OsVersion.getSubminor().value_or(0) / 10);
Str[5] = '0' + (OsVersion.getSubminor().value_or(0) % 10);
Str[6] = '\0';
}
// Set the appropriate OS version define.
if (Triple.isTvOS()) {
Builder.defineMacro("__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__", Str);
} else if (Triple.isiOS()) {
Builder.defineMacro("__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__", Str);
} else if (Triple.isWatchOS()) {
Builder.defineMacro("__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__", Str);
} else if (Triple.isDriverKit()) {
assert(OsVersion.getMinor().value_or(0) < 100 &&
OsVersion.getSubminor().value_or(0) < 100 && "Invalid version!");
Builder.defineMacro("__ENVIRONMENT_DRIVERKIT_VERSION_MIN_REQUIRED__", Str);
} else if (Triple.isMacOSX()) {
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 = OsVersion;
}
static void addMinGWDefines(const llvm::Triple &Triple, const LangOptions &Opts,
MacroBuilder &Builder) {
DefineStd(Builder, "WIN32", Opts);
DefineStd(Builder, "WINNT", Opts);
if (Triple.isArch64Bit()) {
DefineStd(Builder, "WIN64", Opts);
Builder.defineMacro("__MINGW64__");
}
Builder.defineMacro("__MSVCRT__");
Builder.defineMacro("__MINGW32__");
addCygMingDefines(Opts, Builder);
}
static void addVisualCDefines(const LangOptions &Opts, MacroBuilder &Builder) {
if (Opts.CPlusPlus) {
if (Opts.RTTIData)
Builder.defineMacro("_CPPRTTI");
if (Opts.CXXExceptions)
Builder.defineMacro("_CPPUNWIND");
}
if (Opts.Bool)
Builder.defineMacro("__BOOL_DEFINED");
if (!Opts.CharIsSigned)
Builder.defineMacro("_CHAR_UNSIGNED");
// "The /fp:contract option allows the compiler to generate floating-point
// contractions [...]"
if (Opts.getDefaultFPContractMode() != LangOptions::FPModeKind::FPM_Off)
Builder.defineMacro("_M_FP_CONTRACT");
// "The /fp:except option generates code to ensures that any unmasked
// floating-point exceptions are raised at the exact point at which they
// occur, and that no other floating-point exceptions are raised."
if (Opts.getDefaultExceptionMode() ==
LangOptions::FPExceptionModeKind::FPE_Strict)
Builder.defineMacro("_M_FP_EXCEPT");
// "The /fp:fast option allows the compiler to reorder, combine, or simplify
// floating-point operations to optimize floating-point code for speed and
// space. The compiler may omit rounding at assignment statements,
// typecasts, or function calls. It may reorder operations or make algebraic
// transforms, for example, by use of associative and distributive laws. It
// may reorder code even if such transformations result in observably
// different rounding behavior."
//
// "Under /fp:precise and /fp:strict, the compiler doesn't do any mathematical
// transformation unless the transformation is guaranteed to produce a bitwise
// identical result."
const bool any_imprecise_flags =
Opts.FastMath || Opts.FiniteMathOnly || Opts.UnsafeFPMath ||
Opts.AllowFPReassoc || Opts.NoHonorNaNs || Opts.NoHonorInfs ||
Opts.NoSignedZero || Opts.AllowRecip || Opts.ApproxFunc;
// "Under both /fp:precise and /fp:fast, the compiler generates code intended
// to run in the default floating-point environment."
//
// "[The] default floating point environment [...] sets the rounding mode
// to round to nearest."
if (Opts.getDefaultRoundingMode() ==
LangOptions::RoundingMode::NearestTiesToEven) {
if (any_imprecise_flags) {
Builder.defineMacro("_M_FP_FAST");
} else {
Builder.defineMacro("_M_FP_PRECISE");
}
} else if (!any_imprecise_flags && Opts.getDefaultRoundingMode() ==
LangOptions::RoundingMode::Dynamic) {
// "Under /fp:strict, the compiler generates code that allows the
// program to safely unmask floating-point exceptions, read or write
// floating-point status registers, or change rounding modes."
Builder.defineMacro("_M_FP_STRICT");
}
// FIXME: POSIXThreads isn't exactly the option this should be defined for,
// but it works for now.
if (Opts.POSIXThreads)
Builder.defineMacro("_MT");
if (Opts.MSCompatibilityVersion) {
Builder.defineMacro("_MSC_VER",
Twine(Opts.MSCompatibilityVersion / 100000));
Builder.defineMacro("_MSC_FULL_VER", Twine(Opts.MSCompatibilityVersion));
// FIXME We cannot encode the revision information into 32-bits
Builder.defineMacro("_MSC_BUILD", Twine(1));
if (Opts.CPlusPlus11 && Opts.isCompatibleWithMSVC(LangOptions::MSVC2015))
Builder.defineMacro("_HAS_CHAR16_T_LANGUAGE_SUPPORT", Twine(1));
if (Opts.isCompatibleWithMSVC(LangOptions::MSVC2015)) {
if (Opts.CPlusPlus2b)
Builder.defineMacro("_MSVC_LANG", "202004L");
else if (Opts.CPlusPlus20)
Builder.defineMacro("_MSVC_LANG", "202002L");
else if (Opts.CPlusPlus17)
Builder.defineMacro("_MSVC_LANG", "201703L");
else if (Opts.CPlusPlus14)
Builder.defineMacro("_MSVC_LANG", "201402L");
}
}
if (Opts.MicrosoftExt) {
Builder.defineMacro("_MSC_EXTENSIONS");
if (Opts.CPlusPlus11) {
Builder.defineMacro("_RVALUE_REFERENCES_V2_SUPPORTED");
Builder.defineMacro("_RVALUE_REFERENCES_SUPPORTED");
Builder.defineMacro("_NATIVE_NULLPTR_SUPPORTED");
}
}
if (!Opts.MSVolatile)
Builder.defineMacro("_ISO_VOLATILE");
if (Opts.Kernel)
Builder.defineMacro("_KERNEL_MODE");
Builder.defineMacro("_INTEGRAL_MAX_BITS", "64");
Builder.defineMacro("__STDC_NO_THREADS__");
// Starting with VS 2022 17.1, MSVC predefines the below macro to inform
// users of the execution character set defined at compile time.
// The value given is the Windows Code Page Identifier:
// https://docs.microsoft.com/en-us/windows/win32/intl/code-page-identifiers
//
// Clang currently only supports UTF-8, so we'll use 65001
Builder.defineMacro("_MSVC_EXECUTION_CHARACTER_SET", "65001");
}
void addWindowsDefines(const llvm::Triple &Triple, const LangOptions &Opts,
MacroBuilder &Builder) {
Builder.defineMacro("_WIN32");
if (Triple.isArch64Bit())
Builder.defineMacro("_WIN64");
if (Triple.isWindowsGNUEnvironment())
addMinGWDefines(Triple, Opts, Builder);
else if (Triple.isKnownWindowsMSVCEnvironment() ||
(Triple.isWindowsItaniumEnvironment() && Opts.MSVCCompat))
addVisualCDefines(Opts, Builder);
}
} // namespace targets
} // namespace clang
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