e46468407a
This enables raw R"" string literals in C in some language modes and adds an option to disable or enable them explicitly as an extension. Background: GCC supports raw string literals in C in `-gnuXY` modes starting with gnu99. This pr both enables raw string literals in gnu99 mode and later in C and adds an `-f[no-]raw-string-literals` flag to override this behaviour. The decision not to enable raw string literals in gnu89 mode, according to the GCC devs, is intentional as that mode is supposed to be used for ‘old code’ that they don’t want to break; we’ve decided to match GCC’s behaviour here as well. The `-fraw-string-literals` flag can additionally be used to enable raw string literals in modes where they aren’t enabled by default (such as c99—as opposed to gnu99—or even e.g. C++03); conversely, the negated flag can be used to disable them in any gnuXY modes that *do* provide them by default, or to override a previous flag. However, we do *not* support disabling raw string literals (or indeed either of these two options) in C++11 mode and later, because we don’t want to just start supporting disabling features that are actually part of the language in the general case. This fixes #85703.
241 lines
9.0 KiB
C++
241 lines
9.0 KiB
C++
//===- LangOptions.cpp - C Language Family Language Options ---------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the LangOptions class.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Basic/LangOptions.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Support/Path.h"
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using namespace clang;
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LangOptions::LangOptions() : LangStd(LangStandard::lang_unspecified) {
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#define LANGOPT(Name, Bits, Default, Description) Name = Default;
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#define ENUM_LANGOPT(Name, Type, Bits, Default, Description) set##Name(Default);
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#include "clang/Basic/LangOptions.def"
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}
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void LangOptions::resetNonModularOptions() {
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#define LANGOPT(Name, Bits, Default, Description)
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#define BENIGN_LANGOPT(Name, Bits, Default, Description) Name = Default;
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#define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
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Name = static_cast<unsigned>(Default);
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#include "clang/Basic/LangOptions.def"
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// Reset "benign" options with implied values (Options.td ImpliedBy relations)
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// rather than their defaults. This avoids unexpected combinations and
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// invocations that cannot be round-tripped to arguments.
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// FIXME: we should derive this automatically from ImpliedBy in tablegen.
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AllowFPReassoc = UnsafeFPMath;
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NoHonorNaNs = FiniteMathOnly;
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NoHonorInfs = FiniteMathOnly;
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// These options do not affect AST generation.
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NoSanitizeFiles.clear();
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XRayAlwaysInstrumentFiles.clear();
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XRayNeverInstrumentFiles.clear();
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CurrentModule.clear();
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IsHeaderFile = false;
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}
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bool LangOptions::isNoBuiltinFunc(StringRef FuncName) const {
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for (unsigned i = 0, e = NoBuiltinFuncs.size(); i != e; ++i)
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if (FuncName == NoBuiltinFuncs[i])
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return true;
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return false;
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}
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VersionTuple LangOptions::getOpenCLVersionTuple() const {
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const int Ver = OpenCLCPlusPlus ? OpenCLCPlusPlusVersion : OpenCLVersion;
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if (OpenCLCPlusPlus && Ver != 100)
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return VersionTuple(Ver / 100);
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return VersionTuple(Ver / 100, (Ver % 100) / 10);
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}
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unsigned LangOptions::getOpenCLCompatibleVersion() const {
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if (!OpenCLCPlusPlus)
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return OpenCLVersion;
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if (OpenCLCPlusPlusVersion == 100)
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return 200;
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if (OpenCLCPlusPlusVersion == 202100)
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return 300;
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llvm_unreachable("Unknown OpenCL version");
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}
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void LangOptions::remapPathPrefix(SmallVectorImpl<char> &Path) const {
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for (const auto &Entry : MacroPrefixMap)
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if (llvm::sys::path::replace_path_prefix(Path, Entry.first, Entry.second))
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break;
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}
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std::string LangOptions::getOpenCLVersionString() const {
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std::string Result;
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{
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llvm::raw_string_ostream Out(Result);
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Out << (OpenCLCPlusPlus ? "C++ for OpenCL" : "OpenCL C") << " version "
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<< getOpenCLVersionTuple().getAsString();
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}
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return Result;
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}
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void LangOptions::setLangDefaults(LangOptions &Opts, Language Lang,
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const llvm::Triple &T,
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std::vector<std::string> &Includes,
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LangStandard::Kind LangStd) {
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// Set some properties which depend solely on the input kind; it would be nice
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// to move these to the language standard, and have the driver resolve the
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// input kind + language standard.
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//
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// FIXME: Perhaps a better model would be for a single source file to have
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// multiple language standards (C / C++ std, ObjC std, OpenCL std, OpenMP std)
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// simultaneously active?
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if (Lang == Language::Asm) {
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Opts.AsmPreprocessor = 1;
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} else if (Lang == Language::ObjC || Lang == Language::ObjCXX) {
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Opts.ObjC = 1;
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}
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if (LangStd == LangStandard::lang_unspecified)
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LangStd = getDefaultLanguageStandard(Lang, T);
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const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
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Opts.LangStd = LangStd;
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Opts.LineComment = Std.hasLineComments();
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Opts.C99 = Std.isC99();
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Opts.C11 = Std.isC11();
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Opts.C17 = Std.isC17();
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Opts.C23 = Std.isC23();
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Opts.C2y = Std.isC2y();
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Opts.CPlusPlus = Std.isCPlusPlus();
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Opts.CPlusPlus11 = Std.isCPlusPlus11();
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Opts.CPlusPlus14 = Std.isCPlusPlus14();
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Opts.CPlusPlus17 = Std.isCPlusPlus17();
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Opts.CPlusPlus20 = Std.isCPlusPlus20();
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Opts.CPlusPlus23 = Std.isCPlusPlus23();
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Opts.CPlusPlus26 = Std.isCPlusPlus26();
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Opts.GNUMode = Std.isGNUMode();
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Opts.GNUCVersion = 0;
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Opts.HexFloats = Std.hasHexFloats();
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Opts.WChar = Std.isCPlusPlus();
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Opts.Digraphs = Std.hasDigraphs();
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Opts.RawStringLiterals = Std.hasRawStringLiterals();
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Opts.HLSL = Lang == Language::HLSL;
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if (Opts.HLSL && Opts.IncludeDefaultHeader)
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Includes.push_back("hlsl.h");
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// Set OpenCL Version.
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Opts.OpenCL = Std.isOpenCL();
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if (LangStd == LangStandard::lang_opencl10)
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Opts.OpenCLVersion = 100;
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else if (LangStd == LangStandard::lang_opencl11)
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Opts.OpenCLVersion = 110;
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else if (LangStd == LangStandard::lang_opencl12)
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Opts.OpenCLVersion = 120;
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else if (LangStd == LangStandard::lang_opencl20)
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Opts.OpenCLVersion = 200;
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else if (LangStd == LangStandard::lang_opencl30)
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Opts.OpenCLVersion = 300;
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else if (LangStd == LangStandard::lang_openclcpp10)
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Opts.OpenCLCPlusPlusVersion = 100;
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else if (LangStd == LangStandard::lang_openclcpp2021)
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Opts.OpenCLCPlusPlusVersion = 202100;
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else if (LangStd == LangStandard::lang_hlsl2015)
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Opts.HLSLVersion = (unsigned)LangOptions::HLSL_2015;
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else if (LangStd == LangStandard::lang_hlsl2016)
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Opts.HLSLVersion = (unsigned)LangOptions::HLSL_2016;
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else if (LangStd == LangStandard::lang_hlsl2017)
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Opts.HLSLVersion = (unsigned)LangOptions::HLSL_2017;
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else if (LangStd == LangStandard::lang_hlsl2018)
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Opts.HLSLVersion = (unsigned)LangOptions::HLSL_2018;
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else if (LangStd == LangStandard::lang_hlsl2021)
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Opts.HLSLVersion = (unsigned)LangOptions::HLSL_2021;
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else if (LangStd == LangStandard::lang_hlsl202x)
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Opts.HLSLVersion = (unsigned)LangOptions::HLSL_202x;
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// OpenCL has some additional defaults.
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if (Opts.OpenCL) {
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Opts.AltiVec = 0;
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Opts.ZVector = 0;
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Opts.setDefaultFPContractMode(LangOptions::FPM_On);
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Opts.OpenCLCPlusPlus = Opts.CPlusPlus;
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Opts.OpenCLPipes = Opts.getOpenCLCompatibleVersion() == 200;
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Opts.OpenCLGenericAddressSpace = Opts.getOpenCLCompatibleVersion() == 200;
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// Include default header file for OpenCL.
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if (Opts.IncludeDefaultHeader) {
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if (Opts.DeclareOpenCLBuiltins) {
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// Only include base header file for builtin types and constants.
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Includes.push_back("opencl-c-base.h");
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} else {
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Includes.push_back("opencl-c.h");
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}
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}
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}
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Opts.HIP = Lang == Language::HIP;
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Opts.CUDA = Lang == Language::CUDA || Opts.HIP;
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if (Opts.HIP) {
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// HIP toolchain does not support 'Fast' FPOpFusion in backends since it
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// fuses multiplication/addition instructions without contract flag from
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// device library functions in LLVM bitcode, which causes accuracy loss in
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// certain math functions, e.g. tan(-1e20) becomes -0.933 instead of 0.8446.
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// For device library functions in bitcode to work, 'Strict' or 'Standard'
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// FPOpFusion options in backends is needed. Therefore 'fast-honor-pragmas'
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// FP contract option is used to allow fuse across statements in frontend
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// whereas respecting contract flag in backend.
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Opts.setDefaultFPContractMode(LangOptions::FPM_FastHonorPragmas);
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} else if (Opts.CUDA) {
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if (T.isSPIRV()) {
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// Emit OpenCL version metadata in LLVM IR when targeting SPIR-V.
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Opts.OpenCLVersion = 200;
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}
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// Allow fuse across statements disregarding pragmas.
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Opts.setDefaultFPContractMode(LangOptions::FPM_Fast);
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}
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Opts.RenderScript = Lang == Language::RenderScript;
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// OpenCL, C++ and C23 have bool, true, false keywords.
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Opts.Bool = Opts.OpenCL || Opts.CPlusPlus || Opts.C23;
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// OpenCL and HLSL have half keyword
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Opts.Half = Opts.OpenCL || Opts.HLSL;
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}
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FPOptions FPOptions::defaultWithoutTrailingStorage(const LangOptions &LO) {
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FPOptions result(LO);
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return result;
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}
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FPOptionsOverride FPOptions::getChangesSlow(const FPOptions &Base) const {
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FPOptions::storage_type OverrideMask = 0;
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#define OPTION(NAME, TYPE, WIDTH, PREVIOUS) \
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if (get##NAME() != Base.get##NAME()) \
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OverrideMask |= NAME##Mask;
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#include "clang/Basic/FPOptions.def"
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return FPOptionsOverride(*this, OverrideMask);
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}
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LLVM_DUMP_METHOD void FPOptions::dump() {
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#define OPTION(NAME, TYPE, WIDTH, PREVIOUS) \
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llvm::errs() << "\n " #NAME " " << get##NAME();
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#include "clang/Basic/FPOptions.def"
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llvm::errs() << "\n";
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}
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LLVM_DUMP_METHOD void FPOptionsOverride::dump() {
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#define OPTION(NAME, TYPE, WIDTH, PREVIOUS) \
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if (has##NAME##Override()) \
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llvm::errs() << "\n " #NAME " Override is " << get##NAME##Override();
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#include "clang/Basic/FPOptions.def"
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llvm::errs() << "\n";
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}
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