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InitPreprocessor.cpp
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//===--- InitPreprocessor.cpp - PP initialization code. ---------*- C++ -*-===//
//
// 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 the clang::InitializePreprocessor function.
//
//===----------------------------------------------------------------------===//
#include "clang/Basic/FileManager.h"
#include "clang/Basic/HLSLRuntime.h"
#include "clang/Basic/MacroBuilder.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/SyncScope.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Basic/Version.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "clang/Frontend/FrontendOptions.h"
#include "clang/Frontend/Utils.h"
#include "clang/Lex/HeaderSearch.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Lex/PreprocessorOptions.h"
#include "clang/Serialization/ASTReader.h"
#include "llvm/ADT/APFloat.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
using namespace clang;
static bool MacroBodyEndsInBackslash(StringRef MacroBody) {
while (!MacroBody.empty() && isWhitespace(MacroBody.back()))
MacroBody = MacroBody.drop_back();
return !MacroBody.empty() && MacroBody.back() == '\\';
}
// Append a #define line to Buf for Macro. Macro should be of the form XXX,
// in which case we emit "#define XXX 1" or "XXX=Y z W" in which case we emit
// "#define XXX Y z W". To get a #define with no value, use "XXX=".
static void DefineBuiltinMacro(MacroBuilder &Builder, StringRef Macro,
DiagnosticsEngine &Diags) {
std::pair<StringRef, StringRef> MacroPair = Macro.split('=');
StringRef MacroName = MacroPair.first;
StringRef MacroBody = MacroPair.second;
if (MacroName.size() != Macro.size()) {
// Per GCC -D semantics, the macro ends at \n if it exists.
StringRef::size_type End = MacroBody.find_first_of("\n\r");
if (End != StringRef::npos)
Diags.Report(diag::warn_fe_macro_contains_embedded_newline)
<< MacroName;
MacroBody = MacroBody.substr(0, End);
// We handle macro bodies which end in a backslash by appending an extra
// backslash+newline. This makes sure we don't accidentally treat the
// backslash as a line continuation marker.
if (MacroBodyEndsInBackslash(MacroBody))
Builder.defineMacro(MacroName, Twine(MacroBody) + "\\\n");
else
Builder.defineMacro(MacroName, MacroBody);
} else {
// Push "macroname 1".
Builder.defineMacro(Macro);
}
}
/// AddImplicitInclude - Add an implicit \#include of the specified file to the
/// predefines buffer.
/// As these includes are generated by -include arguments the header search
/// logic is going to search relatively to the current working directory.
static void AddImplicitInclude(MacroBuilder &Builder, StringRef File) {
Builder.append(Twine("#include \"") + File + "\"");
}
static void AddImplicitIncludeMacros(MacroBuilder &Builder, StringRef File) {
Builder.append(Twine("#__include_macros \"") + File + "\"");
// Marker token to stop the __include_macros fetch loop.
Builder.append("##"); // ##?
}
/// Add an implicit \#include using the original file used to generate
/// a PCH file.
static void AddImplicitIncludePCH(MacroBuilder &Builder, Preprocessor &PP,
const PCHContainerReader &PCHContainerRdr,
StringRef ImplicitIncludePCH) {
std::string OriginalFile = ASTReader::getOriginalSourceFile(
std::string(ImplicitIncludePCH), PP.getFileManager(), PCHContainerRdr,
PP.getDiagnostics());
if (OriginalFile.empty())
return;
AddImplicitInclude(Builder, OriginalFile);
}
/// PickFP - This is used to pick a value based on the FP semantics of the
/// specified FP model.
template <typename T>
static T PickFP(const llvm::fltSemantics *Sem, T IEEEHalfVal, T IEEESingleVal,
T IEEEDoubleVal, T X87DoubleExtendedVal, T PPCDoubleDoubleVal,
T IEEEQuadVal) {
if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEhalf())
return IEEEHalfVal;
if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEsingle())
return IEEESingleVal;
if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEdouble())
return IEEEDoubleVal;
if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::x87DoubleExtended())
return X87DoubleExtendedVal;
if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::PPCDoubleDouble())
return PPCDoubleDoubleVal;
assert(Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEquad());
return IEEEQuadVal;
}
static void DefineFloatMacros(MacroBuilder &Builder, StringRef Prefix,
const llvm::fltSemantics *Sem, StringRef Ext) {
const char *DenormMin, *NormMax, *Epsilon, *Max, *Min;
NormMax = PickFP(Sem, "6.5504e+4", "3.40282347e+38",
"1.7976931348623157e+308", "1.18973149535723176502e+4932",
"8.98846567431157953864652595394501e+307",
"1.18973149535723176508575932662800702e+4932");
DenormMin = PickFP(Sem, "5.9604644775390625e-8", "1.40129846e-45",
"4.9406564584124654e-324", "3.64519953188247460253e-4951",
"4.94065645841246544176568792868221e-324",
"6.47517511943802511092443895822764655e-4966");
int Digits = PickFP(Sem, 3, 6, 15, 18, 31, 33);
int DecimalDigits = PickFP(Sem, 5, 9, 17, 21, 33, 36);
Epsilon = PickFP(Sem, "9.765625e-4", "1.19209290e-7",
"2.2204460492503131e-16", "1.08420217248550443401e-19",
"4.94065645841246544176568792868221e-324",
"1.92592994438723585305597794258492732e-34");
int MantissaDigits = PickFP(Sem, 11, 24, 53, 64, 106, 113);
int Min10Exp = PickFP(Sem, -4, -37, -307, -4931, -291, -4931);
int Max10Exp = PickFP(Sem, 4, 38, 308, 4932, 308, 4932);
int MinExp = PickFP(Sem, -13, -125, -1021, -16381, -968, -16381);
int MaxExp = PickFP(Sem, 16, 128, 1024, 16384, 1024, 16384);
Min = PickFP(Sem, "6.103515625e-5", "1.17549435e-38", "2.2250738585072014e-308",
"3.36210314311209350626e-4932",
"2.00416836000897277799610805135016e-292",
"3.36210314311209350626267781732175260e-4932");
Max = PickFP(Sem, "6.5504e+4", "3.40282347e+38", "1.7976931348623157e+308",
"1.18973149535723176502e+4932",
"1.79769313486231580793728971405301e+308",
"1.18973149535723176508575932662800702e+4932");
SmallString<32> DefPrefix;
DefPrefix = "__";
DefPrefix += Prefix;
DefPrefix += "_";
Builder.defineMacro(DefPrefix + "DENORM_MIN__", Twine(DenormMin)+Ext);
Builder.defineMacro(DefPrefix + "NORM_MAX__", Twine(NormMax)+Ext);
Builder.defineMacro(DefPrefix + "HAS_DENORM__");
Builder.defineMacro(DefPrefix + "DIG__", Twine(Digits));
Builder.defineMacro(DefPrefix + "DECIMAL_DIG__", Twine(DecimalDigits));
Builder.defineMacro(DefPrefix + "EPSILON__", Twine(Epsilon)+Ext);
Builder.defineMacro(DefPrefix + "HAS_INFINITY__");
Builder.defineMacro(DefPrefix + "HAS_QUIET_NAN__");
Builder.defineMacro(DefPrefix + "MANT_DIG__", Twine(MantissaDigits));
Builder.defineMacro(DefPrefix + "MAX_10_EXP__", Twine(Max10Exp));
Builder.defineMacro(DefPrefix + "MAX_EXP__", Twine(MaxExp));
Builder.defineMacro(DefPrefix + "MAX__", Twine(Max)+Ext);
Builder.defineMacro(DefPrefix + "MIN_10_EXP__","("+Twine(Min10Exp)+")");
Builder.defineMacro(DefPrefix + "MIN_EXP__", "("+Twine(MinExp)+")");
Builder.defineMacro(DefPrefix + "MIN__", Twine(Min)+Ext);
}
/// DefineTypeSize - Emit a macro to the predefines buffer that declares a macro
/// named MacroName with the max value for a type with width 'TypeWidth' a
/// signedness of 'isSigned' and with a value suffix of 'ValSuffix' (e.g. LL).
static void DefineTypeSize(const Twine &MacroName, unsigned TypeWidth,
StringRef ValSuffix, bool isSigned,
MacroBuilder &Builder) {
llvm::APInt MaxVal = isSigned ? llvm::APInt::getSignedMaxValue(TypeWidth)
: llvm::APInt::getMaxValue(TypeWidth);
Builder.defineMacro(MacroName, toString(MaxVal, 10, isSigned) + ValSuffix);
}
/// DefineTypeSize - An overloaded helper that uses TargetInfo to determine
/// the width, suffix, and signedness of the given type
static void DefineTypeSize(const Twine &MacroName, TargetInfo::IntType Ty,
const TargetInfo &TI, MacroBuilder &Builder) {
DefineTypeSize(MacroName, TI.getTypeWidth(Ty), TI.getTypeConstantSuffix(Ty),
TI.isTypeSigned(Ty), Builder);
}
static void DefineFmt(const LangOptions &LangOpts, const Twine &Prefix,
TargetInfo::IntType Ty, const TargetInfo &TI,
MacroBuilder &Builder) {
StringRef FmtModifier = TI.getTypeFormatModifier(Ty);
auto Emitter = [&](char Fmt) {
Builder.defineMacro(Prefix + "_FMT" + Twine(Fmt) + "__",
Twine("\"") + FmtModifier + Twine(Fmt) + "\"");
};
bool IsSigned = TI.isTypeSigned(Ty);
llvm::for_each(StringRef(IsSigned ? "di" : "ouxX"), Emitter);
// C23 added the b and B modifiers for printing binary output of unsigned
// integers. Conditionally define those if compiling in C23 mode.
if (LangOpts.C23 && !IsSigned)
llvm::for_each(StringRef("bB"), Emitter);
}
static void DefineType(const Twine &MacroName, TargetInfo::IntType Ty,
MacroBuilder &Builder) {
Builder.defineMacro(MacroName, TargetInfo::getTypeName(Ty));
}
static void DefineTypeWidth(const Twine &MacroName, TargetInfo::IntType Ty,
const TargetInfo &TI, MacroBuilder &Builder) {
Builder.defineMacro(MacroName, Twine(TI.getTypeWidth(Ty)));
}
static void DefineTypeSizeof(StringRef MacroName, unsigned BitWidth,
const TargetInfo &TI, MacroBuilder &Builder) {
Builder.defineMacro(MacroName,
Twine(BitWidth / TI.getCharWidth()));
}
// This will generate a macro based on the prefix with `_MAX__` as the suffix
// for the max value representable for the type, and a macro with a `_WIDTH__`
// suffix for the width of the type.
static void DefineTypeSizeAndWidth(const Twine &Prefix, TargetInfo::IntType Ty,
const TargetInfo &TI,
MacroBuilder &Builder) {
DefineTypeSize(Prefix + "_MAX__", Ty, TI, Builder);
DefineTypeWidth(Prefix + "_WIDTH__", Ty, TI, Builder);
}
static void DefineExactWidthIntType(const LangOptions &LangOpts,
TargetInfo::IntType Ty,
const TargetInfo &TI,
MacroBuilder &Builder) {
int TypeWidth = TI.getTypeWidth(Ty);
bool IsSigned = TI.isTypeSigned(Ty);
// Use the target specified int64 type, when appropriate, so that [u]int64_t
// ends up being defined in terms of the correct type.
if (TypeWidth == 64)
Ty = IsSigned ? TI.getInt64Type() : TI.getUInt64Type();
// Use the target specified int16 type when appropriate. Some MCU targets
// (such as AVR) have definition of [u]int16_t to [un]signed int.
if (TypeWidth == 16)
Ty = IsSigned ? TI.getInt16Type() : TI.getUInt16Type();
const char *Prefix = IsSigned ? "__INT" : "__UINT";
DefineType(Prefix + Twine(TypeWidth) + "_TYPE__", Ty, Builder);
DefineFmt(LangOpts, Prefix + Twine(TypeWidth), Ty, TI, Builder);
StringRef ConstSuffix(TI.getTypeConstantSuffix(Ty));
Builder.defineMacro(Prefix + Twine(TypeWidth) + "_C_SUFFIX__", ConstSuffix);
}
static void DefineExactWidthIntTypeSize(TargetInfo::IntType Ty,
const TargetInfo &TI,
MacroBuilder &Builder) {
int TypeWidth = TI.getTypeWidth(Ty);
bool IsSigned = TI.isTypeSigned(Ty);
// Use the target specified int64 type, when appropriate, so that [u]int64_t
// ends up being defined in terms of the correct type.
if (TypeWidth == 64)
Ty = IsSigned ? TI.getInt64Type() : TI.getUInt64Type();
// We don't need to define a _WIDTH macro for the exact-width types because
// we already know the width.
const char *Prefix = IsSigned ? "__INT" : "__UINT";
DefineTypeSize(Prefix + Twine(TypeWidth) + "_MAX__", Ty, TI, Builder);
}
static void DefineLeastWidthIntType(const LangOptions &LangOpts,
unsigned TypeWidth, bool IsSigned,
const TargetInfo &TI,
MacroBuilder &Builder) {
TargetInfo::IntType Ty = TI.getLeastIntTypeByWidth(TypeWidth, IsSigned);
if (Ty == TargetInfo::NoInt)
return;
const char *Prefix = IsSigned ? "__INT_LEAST" : "__UINT_LEAST";
DefineType(Prefix + Twine(TypeWidth) + "_TYPE__", Ty, Builder);
// We only want the *_WIDTH macro for the signed types to avoid too many
// predefined macros (the unsigned width and the signed width are identical.)
if (IsSigned)
DefineTypeSizeAndWidth(Prefix + Twine(TypeWidth), Ty, TI, Builder);
else
DefineTypeSize(Prefix + Twine(TypeWidth) + "_MAX__", Ty, TI, Builder);
DefineFmt(LangOpts, Prefix + Twine(TypeWidth), Ty, TI, Builder);
}
static void DefineFastIntType(const LangOptions &LangOpts, unsigned TypeWidth,
bool IsSigned, const TargetInfo &TI,
MacroBuilder &Builder) {
// stdint.h currently defines the fast int types as equivalent to the least
// types.
TargetInfo::IntType Ty = TI.getLeastIntTypeByWidth(TypeWidth, IsSigned);
if (Ty == TargetInfo::NoInt)
return;
const char *Prefix = IsSigned ? "__INT_FAST" : "__UINT_FAST";
DefineType(Prefix + Twine(TypeWidth) + "_TYPE__", Ty, Builder);
// We only want the *_WIDTH macro for the signed types to avoid too many
// predefined macros (the unsigned width and the signed width are identical.)
if (IsSigned)
DefineTypeSizeAndWidth(Prefix + Twine(TypeWidth), Ty, TI, Builder);
else
DefineTypeSize(Prefix + Twine(TypeWidth) + "_MAX__", Ty, TI, Builder);
DefineFmt(LangOpts, Prefix + Twine(TypeWidth), Ty, TI, Builder);
}
/// Get the value the ATOMIC_*_LOCK_FREE macro should have for a type with
/// the specified properties.
static const char *getLockFreeValue(unsigned TypeWidth, const TargetInfo &TI) {
// Fully-aligned, power-of-2 sizes no larger than the inline
// width will be inlined as lock-free operations.
// Note: we do not need to check alignment since _Atomic(T) is always
// appropriately-aligned in clang.
if (TI.hasBuiltinAtomic(TypeWidth, TypeWidth))
return "2"; // "always lock free"
// We cannot be certain what operations the lib calls might be
// able to implement as lock-free on future processors.
return "1"; // "sometimes lock free"
}
/// Add definitions required for a smooth interaction between
/// Objective-C++ automated reference counting and libstdc++ (4.2).
static void AddObjCXXARCLibstdcxxDefines(const LangOptions &LangOpts,
MacroBuilder &Builder) {
Builder.defineMacro("_GLIBCXX_PREDEFINED_OBJC_ARC_IS_SCALAR");
std::string Result;
{
// Provide specializations for the __is_scalar type trait so that
// lifetime-qualified objects are not considered "scalar" types, which
// libstdc++ uses as an indicator of the presence of trivial copy, assign,
// default-construct, and destruct semantics (none of which hold for
// lifetime-qualified objects in ARC).
llvm::raw_string_ostream Out(Result);
Out << "namespace std {\n"
<< "\n"
<< "struct __true_type;\n"
<< "struct __false_type;\n"
<< "\n";
Out << "template<typename _Tp> struct __is_scalar;\n"
<< "\n";
if (LangOpts.ObjCAutoRefCount) {
Out << "template<typename _Tp>\n"
<< "struct __is_scalar<__attribute__((objc_ownership(strong))) _Tp> {\n"
<< " enum { __value = 0 };\n"
<< " typedef __false_type __type;\n"
<< "};\n"
<< "\n";
}
if (LangOpts.ObjCWeak) {
Out << "template<typename _Tp>\n"
<< "struct __is_scalar<__attribute__((objc_ownership(weak))) _Tp> {\n"
<< " enum { __value = 0 };\n"
<< " typedef __false_type __type;\n"
<< "};\n"
<< "\n";
}
if (LangOpts.ObjCAutoRefCount) {
Out << "template<typename _Tp>\n"
<< "struct __is_scalar<__attribute__((objc_ownership(autoreleasing)))"
<< " _Tp> {\n"
<< " enum { __value = 0 };\n"
<< " typedef __false_type __type;\n"
<< "};\n"
<< "\n";
}
Out << "}\n";
}
Builder.append(Result);
}
static void InitializeStandardPredefinedMacros(const TargetInfo &TI,
const LangOptions &LangOpts,
const FrontendOptions &FEOpts,
MacroBuilder &Builder) {
if (LangOpts.HLSL) {
Builder.defineMacro("__hlsl_clang");
// HLSL Version
Builder.defineMacro("__HLSL_VERSION",
Twine((unsigned)LangOpts.getHLSLVersion()));
if (LangOpts.NativeHalfType)
Builder.defineMacro("__HLSL_ENABLE_16_BIT", "1");
// Shader target information
// "enums" for shader stages
Builder.defineMacro("__SHADER_STAGE_VERTEX",
Twine((uint32_t)ShaderStage::Vertex));
Builder.defineMacro("__SHADER_STAGE_PIXEL",
Twine((uint32_t)ShaderStage::Pixel));
Builder.defineMacro("__SHADER_STAGE_GEOMETRY",
Twine((uint32_t)ShaderStage::Geometry));
Builder.defineMacro("__SHADER_STAGE_HULL",
Twine((uint32_t)ShaderStage::Hull));
Builder.defineMacro("__SHADER_STAGE_DOMAIN",
Twine((uint32_t)ShaderStage::Domain));
Builder.defineMacro("__SHADER_STAGE_COMPUTE",
Twine((uint32_t)ShaderStage::Compute));
Builder.defineMacro("__SHADER_STAGE_AMPLIFICATION",
Twine((uint32_t)ShaderStage::Amplification));
Builder.defineMacro("__SHADER_STAGE_MESH",
Twine((uint32_t)ShaderStage::Mesh));
Builder.defineMacro("__SHADER_STAGE_LIBRARY",
Twine((uint32_t)ShaderStage::Library));
// The current shader stage itself
uint32_t StageInteger = static_cast<uint32_t>(
hlsl::getStageFromEnvironment(TI.getTriple().getEnvironment()));
Builder.defineMacro("__SHADER_TARGET_STAGE", Twine(StageInteger));
// Add target versions
if (TI.getTriple().getOS() == llvm::Triple::ShaderModel) {
VersionTuple Version = TI.getTriple().getOSVersion();
Builder.defineMacro("__SHADER_TARGET_MAJOR", Twine(Version.getMajor()));
unsigned Minor = Version.getMinor().value_or(0);
Builder.defineMacro("__SHADER_TARGET_MINOR", Twine(Minor));
}
return;
}
// C++ [cpp.predefined]p1:
// The following macro names shall be defined by the implementation:
// -- __STDC__
// [C++] Whether __STDC__ is predefined and if so, what its value is,
// are implementation-defined.
// (Removed in C++20.)
if ((!LangOpts.MSVCCompat || LangOpts.MSVCEnableStdcMacro) &&
!LangOpts.TraditionalCPP)
Builder.defineMacro("__STDC__");
// -- __STDC_HOSTED__
// The integer literal 1 if the implementation is a hosted
// implementation or the integer literal 0 if it is not.
if (LangOpts.Freestanding)
Builder.defineMacro("__STDC_HOSTED__", "0");
else
Builder.defineMacro("__STDC_HOSTED__");
// -- __STDC_VERSION__
// [C++] Whether __STDC_VERSION__ is predefined and if so, what its
// value is, are implementation-defined.
// (Removed in C++20.)
if (!LangOpts.CPlusPlus) {
if (LangOpts.C2y)
Builder.defineMacro("__STDC_VERSION__", "202400L");
else if (LangOpts.C23)
Builder.defineMacro("__STDC_VERSION__", "202311L");
else if (LangOpts.C17)
Builder.defineMacro("__STDC_VERSION__", "201710L");
else if (LangOpts.C11)
Builder.defineMacro("__STDC_VERSION__", "201112L");
else if (LangOpts.C99)
Builder.defineMacro("__STDC_VERSION__", "199901L");
else if (!LangOpts.GNUMode && LangOpts.Digraphs)
Builder.defineMacro("__STDC_VERSION__", "199409L");
} else {
// -- __cplusplus
if (LangOpts.CPlusPlus26)
// FIXME: Use correct value for C++26.
Builder.defineMacro("__cplusplus", "202400L");
else if (LangOpts.CPlusPlus23)
Builder.defineMacro("__cplusplus", "202302L");
// [C++20] The integer literal 202002L.
else if (LangOpts.CPlusPlus20)
Builder.defineMacro("__cplusplus", "202002L");
// [C++17] The integer literal 201703L.
else if (LangOpts.CPlusPlus17)
Builder.defineMacro("__cplusplus", "201703L");
// [C++14] The name __cplusplus is defined to the value 201402L when
// compiling a C++ translation unit.
else if (LangOpts.CPlusPlus14)
Builder.defineMacro("__cplusplus", "201402L");
// [C++11] The name __cplusplus is defined to the value 201103L when
// compiling a C++ translation unit.
else if (LangOpts.CPlusPlus11)
Builder.defineMacro("__cplusplus", "201103L");
// [C++03] The name __cplusplus is defined to the value 199711L when
// compiling a C++ translation unit.
else
Builder.defineMacro("__cplusplus", "199711L");
// -- __STDCPP_DEFAULT_NEW_ALIGNMENT__
// [C++17] An integer literal of type std::size_t whose value is the
// alignment guaranteed by a call to operator new(std::size_t)
//
// We provide this in all language modes, since it seems generally useful.
Builder.defineMacro("__STDCPP_DEFAULT_NEW_ALIGNMENT__",
Twine(TI.getNewAlign() / TI.getCharWidth()) +
TI.getTypeConstantSuffix(TI.getSizeType()));
// -- __STDCPP_THREADS__
// Defined, and has the value integer literal 1, if and only if a
// program can have more than one thread of execution.
if (LangOpts.getThreadModel() == LangOptions::ThreadModelKind::POSIX)
Builder.defineMacro("__STDCPP_THREADS__", "1");
}
// In C11 these are environment macros. In C++11 they are only defined
// as part of <cuchar>. To prevent breakage when mixing C and C++
// code, define these macros unconditionally. We can define them
// unconditionally, as Clang always uses UTF-16 and UTF-32 for 16-bit
// and 32-bit character literals.
Builder.defineMacro("__STDC_UTF_16__", "1");
Builder.defineMacro("__STDC_UTF_32__", "1");
// __has_embed definitions
Builder.defineMacro("__STDC_EMBED_NOT_FOUND__",
llvm::itostr(static_cast<int>(EmbedResult::NotFound)));
Builder.defineMacro("__STDC_EMBED_FOUND__",
llvm::itostr(static_cast<int>(EmbedResult::Found)));
Builder.defineMacro("__STDC_EMBED_EMPTY__",
llvm::itostr(static_cast<int>(EmbedResult::Empty)));
if (LangOpts.ObjC)
Builder.defineMacro("__OBJC__");
// OpenCL v1.0/1.1 s6.9, v1.2/2.0 s6.10: Preprocessor Directives and Macros.
if (LangOpts.OpenCL) {
if (LangOpts.CPlusPlus) {
switch (LangOpts.OpenCLCPlusPlusVersion) {
case 100:
Builder.defineMacro("__OPENCL_CPP_VERSION__", "100");
break;
case 202100:
Builder.defineMacro("__OPENCL_CPP_VERSION__", "202100");
break;
default:
llvm_unreachable("Unsupported C++ version for OpenCL");
}
Builder.defineMacro("__CL_CPP_VERSION_1_0__", "100");
Builder.defineMacro("__CL_CPP_VERSION_2021__", "202100");
} else {
// OpenCL v1.0 and v1.1 do not have a predefined macro to indicate the
// language standard with which the program is compiled. __OPENCL_VERSION__
// is for the OpenCL version supported by the OpenCL device, which is not
// necessarily the language standard with which the program is compiled.
// A shared OpenCL header file requires a macro to indicate the language
// standard. As a workaround, __OPENCL_C_VERSION__ is defined for
// OpenCL v1.0 and v1.1.
switch (LangOpts.OpenCLVersion) {
case 100:
Builder.defineMacro("__OPENCL_C_VERSION__", "100");
break;
case 110:
Builder.defineMacro("__OPENCL_C_VERSION__", "110");
break;
case 120:
Builder.defineMacro("__OPENCL_C_VERSION__", "120");
break;
case 200:
Builder.defineMacro("__OPENCL_C_VERSION__", "200");
break;
case 300:
Builder.defineMacro("__OPENCL_C_VERSION__", "300");
break;
default:
llvm_unreachable("Unsupported OpenCL version");
}
}
Builder.defineMacro("CL_VERSION_1_0", "100");
Builder.defineMacro("CL_VERSION_1_1", "110");
Builder.defineMacro("CL_VERSION_1_2", "120");
Builder.defineMacro("CL_VERSION_2_0", "200");
Builder.defineMacro("CL_VERSION_3_0", "300");
if (TI.isLittleEndian())
Builder.defineMacro("__ENDIAN_LITTLE__");
if (LangOpts.FastRelaxedMath)
Builder.defineMacro("__FAST_RELAXED_MATH__");
}
if (LangOpts.SYCLIsDevice || LangOpts.SYCLIsHost) {
// SYCL Version is set to a value when building SYCL applications
for (const std::pair<StringRef, StringRef> &Macro :
getSYCLVersionMacros(LangOpts))
Builder.defineMacro(Macro.first, Macro.second);
if (LangOpts.SYCLValueFitInMaxInt)
Builder.defineMacro("__SYCL_ID_QUERIES_FIT_IN_INT__");
// Set __SYCL_DISABLE_PARALLEL_FOR_RANGE_ROUNDING__ macro for
// both host and device compilations if -fsycl-disable-range-rounding
// flag is used.
switch (LangOpts.getSYCLRangeRounding()) {
case LangOptions::SYCLRangeRoundingPreference::Disable:
Builder.defineMacro("__SYCL_DISABLE_PARALLEL_FOR_RANGE_ROUNDING__");
break;
case LangOptions::SYCLRangeRoundingPreference::Force:
Builder.defineMacro("__SYCL_FORCE_PARALLEL_FOR_RANGE_ROUNDING__");
break;
default:
break;
}
// Set __SYCL_EXP_PARALLEL_FOR_RANGE_ROUNDING__ macro for
// both host and device compilations if -fsycl-exp-range-rounding
// flag is used.
if (LangOpts.SYCLExperimentalRangeRounding)
Builder.defineMacro("__SYCL_EXP_PARALLEL_FOR_RANGE_ROUNDING__");
}
if (LangOpts.DeclareSPIRVBuiltins) {
Builder.defineMacro("__SPIRV_BUILTIN_DECLARATIONS__");
}
// Not "standard" per se, but available even with the -undef flag.
if (LangOpts.AsmPreprocessor)
Builder.defineMacro("__ASSEMBLER__");
if (LangOpts.CUDA) {
if (LangOpts.GPURelocatableDeviceCode)
Builder.defineMacro("__CLANG_RDC__");
if (!LangOpts.HIP)
Builder.defineMacro("__CUDA__");
if (LangOpts.GPUDefaultStream ==
LangOptions::GPUDefaultStreamKind::PerThread)
Builder.defineMacro("CUDA_API_PER_THREAD_DEFAULT_STREAM");
}
if (LangOpts.HIP) {
Builder.defineMacro("__HIP__");
Builder.defineMacro("__HIPCC__");
if (LangOpts.HIPStdPar) {
Builder.defineMacro("__HIPSTDPAR__");
if (LangOpts.HIPStdParInterposeAlloc)
Builder.defineMacro("__HIPSTDPAR_INTERPOSE_ALLOC__");
}
if (LangOpts.CUDAIsDevice) {
Builder.defineMacro("__HIP_DEVICE_COMPILE__");
if (!TI.hasHIPImageSupport()) {
Builder.defineMacro("__HIP_NO_IMAGE_SUPPORT__", "1");
// Deprecated.
Builder.defineMacro("__HIP_NO_IMAGE_SUPPORT", "1");
}
}
if (LangOpts.GPUDefaultStream ==
LangOptions::GPUDefaultStreamKind::PerThread) {
Builder.defineMacro("__HIP_API_PER_THREAD_DEFAULT_STREAM__");
// Deprecated.
Builder.defineMacro("HIP_API_PER_THREAD_DEFAULT_STREAM");
}
}
if (LangOpts.HIP || (LangOpts.OpenCL && TI.getTriple().isAMDGPU())) {
Builder.defineMacro("__HIP_MEMORY_SCOPE_SINGLETHREAD", "1");
Builder.defineMacro("__HIP_MEMORY_SCOPE_WAVEFRONT", "2");
Builder.defineMacro("__HIP_MEMORY_SCOPE_WORKGROUP", "3");
Builder.defineMacro("__HIP_MEMORY_SCOPE_AGENT", "4");
Builder.defineMacro("__HIP_MEMORY_SCOPE_SYSTEM", "5");
}
if (LangOpts.OpenACC) {
// FIXME: When we have full support for OpenACC, we should set this to the
// version we support. Until then, set as '1' by default, but provide a
// temporary mechanism for users to override this so real-world examples can
// be tested against.
if (!LangOpts.OpenACCMacroOverride.empty())
Builder.defineMacro("_OPENACC", LangOpts.OpenACCMacroOverride);
else
Builder.defineMacro("_OPENACC", "1");
}
}
/// Initialize the predefined C++ language feature test macros defined in
/// ISO/IEC JTC1/SC22/WG21 (C++) SD-6: "SG10 Feature Test Recommendations".
static void InitializeCPlusPlusFeatureTestMacros(const LangOptions &LangOpts,
MacroBuilder &Builder) {
// C++98 features.
if (LangOpts.RTTI)
Builder.defineMacro("__cpp_rtti", "199711L");
if (LangOpts.CXXExceptions)
Builder.defineMacro("__cpp_exceptions", "199711L");
// C++11 features.
if (LangOpts.CPlusPlus11) {
Builder.defineMacro("__cpp_unicode_characters", "200704L");
Builder.defineMacro("__cpp_raw_strings", "200710L");
Builder.defineMacro("__cpp_unicode_literals", "200710L");
Builder.defineMacro("__cpp_user_defined_literals", "200809L");
Builder.defineMacro("__cpp_lambdas", "200907L");
Builder.defineMacro("__cpp_constexpr", LangOpts.CPlusPlus26 ? "202406L"
: LangOpts.CPlusPlus23 ? "202211L"
: LangOpts.CPlusPlus20 ? "201907L"
: LangOpts.CPlusPlus17 ? "201603L"
: LangOpts.CPlusPlus14 ? "201304L"
: "200704");
Builder.defineMacro("__cpp_constexpr_in_decltype", "201711L");
Builder.defineMacro("__cpp_range_based_for",
LangOpts.CPlusPlus23 ? "202211L"
: LangOpts.CPlusPlus17 ? "201603L"
: "200907");
Builder.defineMacro("__cpp_static_assert", LangOpts.CPlusPlus26 ? "202306L"
: LangOpts.CPlusPlus17
? "201411L"
: "200410");
Builder.defineMacro("__cpp_decltype", "200707L");
Builder.defineMacro("__cpp_attributes", "200809L");
Builder.defineMacro("__cpp_rvalue_references", "200610L");
Builder.defineMacro("__cpp_variadic_templates", "200704L");
Builder.defineMacro("__cpp_initializer_lists", "200806L");
Builder.defineMacro("__cpp_delegating_constructors", "200604L");
Builder.defineMacro("__cpp_nsdmi", "200809L");
Builder.defineMacro("__cpp_inheriting_constructors", "201511L");
Builder.defineMacro("__cpp_ref_qualifiers", "200710L");
Builder.defineMacro("__cpp_alias_templates", "200704L");
}
if (LangOpts.ThreadsafeStatics)
Builder.defineMacro("__cpp_threadsafe_static_init", "200806L");
// C++14 features.
if (LangOpts.CPlusPlus14) {
Builder.defineMacro("__cpp_binary_literals", "201304L");
Builder.defineMacro("__cpp_digit_separators", "201309L");
Builder.defineMacro("__cpp_init_captures",
LangOpts.CPlusPlus20 ? "201803L" : "201304L");
Builder.defineMacro("__cpp_generic_lambdas",
LangOpts.CPlusPlus20 ? "201707L" : "201304L");
Builder.defineMacro("__cpp_decltype_auto", "201304L");
Builder.defineMacro("__cpp_return_type_deduction", "201304L");
Builder.defineMacro("__cpp_aggregate_nsdmi", "201304L");
Builder.defineMacro("__cpp_variable_templates", "201304L");
}
if (LangOpts.SizedDeallocation)
Builder.defineMacro("__cpp_sized_deallocation", "201309L");
// C++17 features.
if (LangOpts.CPlusPlus17) {
Builder.defineMacro("__cpp_hex_float", "201603L");
Builder.defineMacro("__cpp_inline_variables", "201606L");
Builder.defineMacro("__cpp_noexcept_function_type", "201510L");
Builder.defineMacro("__cpp_capture_star_this", "201603L");
Builder.defineMacro("__cpp_if_constexpr", "201606L");
Builder.defineMacro("__cpp_deduction_guides", "201703L"); // (not latest)
Builder.defineMacro("__cpp_template_auto", "201606L"); // (old name)
Builder.defineMacro("__cpp_namespace_attributes", "201411L");
Builder.defineMacro("__cpp_enumerator_attributes", "201411L");
Builder.defineMacro("__cpp_nested_namespace_definitions", "201411L");
Builder.defineMacro("__cpp_variadic_using", "201611L");
Builder.defineMacro("__cpp_aggregate_bases", "201603L");
Builder.defineMacro("__cpp_structured_bindings", "202403L");
Builder.defineMacro("__cpp_nontype_template_args",
"201411L"); // (not latest)
Builder.defineMacro("__cpp_fold_expressions", "201603L");
Builder.defineMacro("__cpp_guaranteed_copy_elision", "201606L");
Builder.defineMacro("__cpp_nontype_template_parameter_auto", "201606L");
}
if (LangOpts.AlignedAllocation && !LangOpts.AlignedAllocationUnavailable)
Builder.defineMacro("__cpp_aligned_new", "201606L");
if (LangOpts.RelaxedTemplateTemplateArgs)
Builder.defineMacro("__cpp_template_template_args", "201611L");
// C++20 features.
if (LangOpts.CPlusPlus20) {
Builder.defineMacro("__cpp_aggregate_paren_init", "201902L");
Builder.defineMacro("__cpp_concepts", "202002");
Builder.defineMacro("__cpp_conditional_explicit", "201806L");
Builder.defineMacro("__cpp_consteval", "202211L");
Builder.defineMacro("__cpp_constexpr_dynamic_alloc", "201907L");
Builder.defineMacro("__cpp_constinit", "201907L");
Builder.defineMacro("__cpp_impl_coroutine", "201902L");
Builder.defineMacro("__cpp_designated_initializers", "201707L");
Builder.defineMacro("__cpp_impl_three_way_comparison", "201907L");
//Builder.defineMacro("__cpp_modules", "201907L");
Builder.defineMacro("__cpp_using_enum", "201907L");
}
// C++23 features.
if (LangOpts.CPlusPlus23) {
Builder.defineMacro("__cpp_implicit_move", "202207L");
Builder.defineMacro("__cpp_size_t_suffix", "202011L");
Builder.defineMacro("__cpp_if_consteval", "202106L");
Builder.defineMacro("__cpp_multidimensional_subscript", "202211L");
Builder.defineMacro("__cpp_auto_cast", "202110L");
}
// We provide those C++23 features as extensions in earlier language modes, so
// we also define their feature test macros.
if (LangOpts.CPlusPlus11)
Builder.defineMacro("__cpp_static_call_operator", "202207L");
Builder.defineMacro("__cpp_named_character_escapes", "202207L");
Builder.defineMacro("__cpp_placeholder_variables", "202306L");
// C++26 features supported in earlier language modes.
Builder.defineMacro("__cpp_pack_indexing", "202311L");
Builder.defineMacro("__cpp_deleted_function", "202403L");
Builder.defineMacro("__cpp_variadic_friend", "202403L");
if (LangOpts.Char8)
Builder.defineMacro("__cpp_char8_t", "202207L");
Builder.defineMacro("__cpp_impl_destroying_delete", "201806L");
}
/// InitializeOpenCLFeatureTestMacros - Define OpenCL macros based on target
/// settings and language version
void InitializeOpenCLFeatureTestMacros(const TargetInfo &TI,
const LangOptions &Opts,
MacroBuilder &Builder) {
const llvm::StringMap<bool> &OpenCLFeaturesMap = TI.getSupportedOpenCLOpts();
// FIXME: OpenCL options which affect language semantics/syntax
// should be moved into LangOptions.
auto defineOpenCLExtMacro = [&](llvm::StringRef Name, auto... OptArgs) {
// Check if extension is supported by target and is available in this
// OpenCL version
if (TI.hasFeatureEnabled(OpenCLFeaturesMap, Name) &&
OpenCLOptions::isOpenCLOptionAvailableIn(Opts, OptArgs...))
Builder.defineMacro(Name);
};
#define OPENCL_GENERIC_EXTENSION(Ext, ...) \
defineOpenCLExtMacro(#Ext, __VA_ARGS__);
#include "clang/Basic/OpenCLExtensions.def"
// Assume compiling for FULL profile
Builder.defineMacro("__opencl_c_int64");
}
llvm::SmallString<32> ConstructFixedPointLiteral(llvm::APFixedPoint Val,
llvm::StringRef Suffix) {
if (Val.isSigned() && Val == llvm::APFixedPoint::getMin(Val.getSemantics())) {
// When representing the min value of a signed fixed point type in source
// code, we cannot simply write `-<lowest value>`. For example, the min
// value of a `short _Fract` cannot be written as `-1.0hr`. This is because
// the parser will read this (and really any negative numerical literal) as
// a UnaryOperator that owns a FixedPointLiteral with a positive value
// rather than just a FixedPointLiteral with a negative value. Compiling
// `-1.0hr` results in an overflow to the maximal value of that fixed point
// type. The correct way to represent a signed min value is to instead split
// it into two halves, like `(-0.5hr-0.5hr)` which is what the standard
// defines SFRACT_MIN as.
llvm::SmallString<32> Literal;
Literal.push_back('(');
llvm::SmallString<32> HalfStr =
ConstructFixedPointLiteral(Val.shr(1), Suffix);
Literal += HalfStr;
Literal += HalfStr;
Literal.push_back(')');
return Literal;
}
llvm::SmallString<32> Str(Val.toString());
Str += Suffix;
return Str;
}
void DefineFixedPointMacros(const TargetInfo &TI, MacroBuilder &Builder,
llvm::StringRef TypeName, llvm::StringRef Suffix,
unsigned Width, unsigned Scale, bool Signed) {
// Saturation doesn't affect the size or scale of a fixed point type, so we
// don't need it here.
llvm::FixedPointSemantics FXSema(
Width, Scale, Signed, /*IsSaturated=*/false,
!Signed && TI.doUnsignedFixedPointTypesHavePadding());
llvm::SmallString<32> MacroPrefix("__");
MacroPrefix += TypeName;
Builder.defineMacro(MacroPrefix + "_EPSILON__",
ConstructFixedPointLiteral(
llvm::APFixedPoint::getEpsilon(FXSema), Suffix));
Builder.defineMacro(MacroPrefix + "_FBIT__", Twine(Scale));
Builder.defineMacro(
MacroPrefix + "_MAX__",
ConstructFixedPointLiteral(llvm::APFixedPoint::getMax(FXSema), Suffix));
// ISO/IEC TR 18037:2008 doesn't specify MIN macros for unsigned types since
// they're all just zero.
if (Signed)
Builder.defineMacro(
MacroPrefix + "_MIN__",
ConstructFixedPointLiteral(llvm::APFixedPoint::getMin(FXSema), Suffix));
}
static void InitializePredefinedMacros(const TargetInfo &TI,
const LangOptions &LangOpts,
const FrontendOptions &FEOpts,
const PreprocessorOptions &PPOpts,
MacroBuilder &Builder) {
// Compiler version introspection macros.
Builder.defineMacro("__llvm__"); // LLVM Backend
Builder.defineMacro("__clang__"); // Clang Frontend
#define TOSTR2(X) #X
#define TOSTR(X) TOSTR2(X)
Builder.defineMacro("__clang_major__", TOSTR(CLANG_VERSION_MAJOR));
Builder.defineMacro("__clang_minor__", TOSTR(CLANG_VERSION_MINOR));
Builder.defineMacro("__clang_patchlevel__", TOSTR(CLANG_VERSION_PATCHLEVEL));
#undef TOSTR
#undef TOSTR2
Builder.defineMacro("__clang_version__",
"\"" CLANG_VERSION_STRING " "
+ getClangFullRepositoryVersion() + "\"");
if (LangOpts.GNUCVersion != 0) {
// Major, minor, patch, are given two decimal places each, so 4.2.1 becomes
// 40201.
unsigned GNUCMajor = LangOpts.GNUCVersion / 100 / 100;
unsigned GNUCMinor = LangOpts.GNUCVersion / 100 % 100;
unsigned GNUCPatch = LangOpts.GNUCVersion % 100;
Builder.defineMacro("__GNUC__", Twine(GNUCMajor));
Builder.defineMacro("__GNUC_MINOR__", Twine(GNUCMinor));
Builder.defineMacro("__GNUC_PATCHLEVEL__", Twine(GNUCPatch));
Builder.defineMacro("__GXX_ABI_VERSION", "1002");
if (LangOpts.CPlusPlus) {
Builder.defineMacro("__GNUG__", Twine(GNUCMajor));
Builder.defineMacro("__GXX_WEAK__");
}
}
// Define macros for the C11 / C++11 memory orderings
Builder.defineMacro("__ATOMIC_RELAXED", "0");
Builder.defineMacro("__ATOMIC_CONSUME", "1");
Builder.defineMacro("__ATOMIC_ACQUIRE", "2");
Builder.defineMacro("__ATOMIC_RELEASE", "3");
Builder.defineMacro("__ATOMIC_ACQ_REL", "4");
Builder.defineMacro("__ATOMIC_SEQ_CST", "5");
// Define macros for the clang atomic scopes.
Builder.defineMacro("__MEMORY_SCOPE_SYSTEM", "0");
Builder.defineMacro("__MEMORY_SCOPE_DEVICE", "1");
Builder.defineMacro("__MEMORY_SCOPE_WRKGRP", "2");
Builder.defineMacro("__MEMORY_SCOPE_WVFRNT", "3");
Builder.defineMacro("__MEMORY_SCOPE_SINGLE", "4");
// Define macros for the OpenCL memory scope.
// The values should match AtomicScopeOpenCLModel::ID enum.
static_assert(
static_cast<unsigned>(AtomicScopeOpenCLModel::WorkGroup) == 1 &&
static_cast<unsigned>(AtomicScopeOpenCLModel::Device) == 2 &&
static_cast<unsigned>(AtomicScopeOpenCLModel::AllSVMDevices) == 3 &&
static_cast<unsigned>(AtomicScopeOpenCLModel::SubGroup) == 4,
"Invalid OpenCL memory scope enum definition");
Builder.defineMacro("__OPENCL_MEMORY_SCOPE_WORK_ITEM", "0");
Builder.defineMacro("__OPENCL_MEMORY_SCOPE_WORK_GROUP", "1");
Builder.defineMacro("__OPENCL_MEMORY_SCOPE_DEVICE", "2");
Builder.defineMacro("__OPENCL_MEMORY_SCOPE_ALL_SVM_DEVICES", "3");
Builder.defineMacro("__OPENCL_MEMORY_SCOPE_SUB_GROUP", "4");
// Define macros for floating-point data classes, used in __builtin_isfpclass.
Builder.defineMacro("__FPCLASS_SNAN", "0x0001");
Builder.defineMacro("__FPCLASS_QNAN", "0x0002");
Builder.defineMacro("__FPCLASS_NEGINF", "0x0004");
Builder.defineMacro("__FPCLASS_NEGNORMAL", "0x0008");
Builder.defineMacro("__FPCLASS_NEGSUBNORMAL", "0x0010");
Builder.defineMacro("__FPCLASS_NEGZERO", "0x0020");
Builder.defineMacro("__FPCLASS_POSZERO", "0x0040");
Builder.defineMacro("__FPCLASS_POSSUBNORMAL", "0x0080");
Builder.defineMacro("__FPCLASS_POSNORMAL", "0x0100");
Builder.defineMacro("__FPCLASS_POSINF", "0x0200");
// Support for #pragma redefine_extname (Sun compatibility)
Builder.defineMacro("__PRAGMA_REDEFINE_EXTNAME", "1");
// Previously this macro was set to a string aiming to achieve compatibility
// with GCC 4.2.1. Now, just return the full Clang version
Builder.defineMacro("__VERSION__", "\"" +
Twine(getClangFullCPPVersion()) + "\"");
// Initialize language-specific preprocessor defines.
// Standard conforming mode?
if (!LangOpts.GNUMode && !LangOpts.MSVCCompat)
Builder.defineMacro("__STRICT_ANSI__");
if (LangOpts.GNUCVersion && LangOpts.CPlusPlus11)
Builder.defineMacro("__GXX_EXPERIMENTAL_CXX0X__");
if (TI.getTriple().isWindowsGNUEnvironment()) {
// Set ABI defining macros for libstdc++ for MinGW, where the
// default in libstdc++ differs from the defaults for this target.
Builder.defineMacro("__GXX_TYPEINFO_EQUALITY_INLINE", "0");
}
if (LangOpts.ObjC) {
if (LangOpts.ObjCRuntime.isNonFragile()) {
Builder.defineMacro("__OBJC2__");
if (LangOpts.ObjCExceptions)
Builder.defineMacro("OBJC_ZEROCOST_EXCEPTIONS");
}
if (LangOpts.getGC() != LangOptions::NonGC)
Builder.defineMacro("__OBJC_GC__");
if (LangOpts.ObjCRuntime.isNeXTFamily())
Builder.defineMacro("__NEXT_RUNTIME__");
if (LangOpts.ObjCRuntime.getKind() == ObjCRuntime::GNUstep) {
auto version = LangOpts.ObjCRuntime.getVersion();
std::string versionString = "1";
// Don't rely on the tuple argument, because we can be asked to target
// later ABIs than we actually support, so clamp these values to those
// currently supported
if (version >= VersionTuple(2, 0))