clang/Basic/CodeGenOptions.h

//===--- CodeGenOptions.h ---------------------------------------*- 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 defines the CodeGenOptions interface.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_BASIC_CODEGENOPTIONS_H
#define LLVM_CLANG_BASIC_CODEGENOPTIONS_H

#include "clang/Basic/DebugInfoOptions.h"
#include "clang/Basic/Sanitizers.h"
#include "clang/Basic/XRayInstr.h"
#include "llvm/ADT/FloatingPointMode.h"
#include "llvm/Support/CodeGen.h"
#include "llvm/Support/Regex.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Transforms/Instrumentation/AddressSanitizerOptions.h"
#include <map>
#include <memory>
#include <string>
#include <vector>

namespace clang {

/// Bitfields of CodeGenOptions, split out from CodeGenOptions to ensure
/// that this large collection of bitfields is a trivial class type.
class CodeGenOptionsBase {
  friend class CompilerInvocation;

public:
#define CODEGENOPT(Name, Bits, Default) unsigned Name : Bits;
#define ENUM_CODEGENOPT(Name, Type, Bits, Default)
#include "clang/Basic/CodeGenOptions.def"

protected:
#define CODEGENOPT(Name, Bits, Default)
#define ENUM_CODEGENOPT(Name, Type, Bits, Default) unsigned Name : Bits;
#include "clang/Basic/CodeGenOptions.def"
};

/// CodeGenOptions - Track various options which control how the code
/// is optimized and passed to the backend.
class CodeGenOptions : public CodeGenOptionsBase {
public:
  enum InliningMethod {
    NormalInlining,     // Use the standard function inlining pass.
    OnlyHintInlining,   // Inline only (implicitly) hinted functions.
    OnlyAlwaysInlining  // Only run the always inlining pass.
  };

  enum VectorLibrary {
    NoLibrary,         // Don't use any vector library.
    Accelerate,        // Use the Accelerate framework.
    LIBMVEC,           // GLIBC vector math library.
    MASSV,             // IBM MASS vector library.
    SVML,              // Intel short vector math library.
    Darwin_libsystem_m // Use Darwin's libsytem_m vector functions.
  };

  enum ObjCDispatchMethodKind {
    Legacy = 0,
    NonLegacy = 1,
    Mixed = 2
  };

  enum TLSModel {
    GeneralDynamicTLSModel,
    LocalDynamicTLSModel,
    InitialExecTLSModel,
    LocalExecTLSModel
  };

  enum StructReturnConventionKind {
    SRCK_Default,  // No special option was passed.
    SRCK_OnStack,  // Small structs on the stack (-fpcc-struct-return).
    SRCK_InRegs    // Small structs in registers (-freg-struct-return).
  };

  enum ProfileInstrKind {
    ProfileNone,       // Profile instrumentation is turned off.
    ProfileClangInstr, // Clang instrumentation to generate execution counts
                       // to use with PGO.
    ProfileIRInstr,    // IR level PGO instrumentation in LLVM.
    ProfileCSIRInstr, // IR level PGO context sensitive instrumentation in LLVM.
  };

  enum EmbedBitcodeKind {
    Embed_Off,      // No embedded bitcode.
    Embed_All,      // Embed both bitcode and commandline in the output.
    Embed_Bitcode,  // Embed just the bitcode in the output.
    Embed_Marker    // Embed a marker as a placeholder for bitcode.
  };

  // This field stores one of the allowed values for the option
  // -fbasic-block-sections=.  The allowed values with this option are:
  // {"labels", "all", "list=<file>", "none"}.
  //
  // "labels":      Only generate basic block symbols (labels) for all basic
  //                blocks, do not generate unique sections for basic blocks.
  //                Use the machine basic block id in the symbol name to
  //                associate profile info from virtual address to machine
  //                basic block.
  // "all" :        Generate basic block sections for all basic blocks.
  // "list=<file>": Generate basic block sections for a subset of basic blocks.
  //                The functions and the machine basic block ids are specified
  //                in the file.
  // "none":        Disable sections/labels for basic blocks.
  std::string BBSections;

  // If set, override the default value of MCAsmInfo::BinutilsVersion. If
  // DisableIntegratedAS is specified, the assembly output will consider GNU as
  // support. "none" means that all ELF features can be used, regardless of
  // binutils support.
  std::string BinutilsVersion;

  enum class FramePointerKind {
    None,        // Omit all frame pointers.
    NonLeaf,     // Keep non-leaf frame pointers.
    All,         // Keep all frame pointers.
  };

  enum FiniteLoopsKind {
    Language, // Not specified, use language standard.
    Always,   // All loops are assumed to be finite.
    Never,    // No loop is assumed to be finite.
  };

  /// The code model to use (-mcmodel).
  std::string CodeModel;

  /// The filename with path we use for coverage data files. The runtime
  /// allows further manipulation with the GCOV_PREFIX and GCOV_PREFIX_STRIP
  /// environment variables.
  std::string CoverageDataFile;

  /// The filename with path we use for coverage notes files.
  std::string CoverageNotesFile;

  /// Regexes separated by a semi-colon to filter the files to instrument.
  std::string ProfileFilterFiles;

  /// Regexes separated by a semi-colon to filter the files to not instrument.
  std::string ProfileExcludeFiles;

  /// The version string to put into coverage files.
  char CoverageVersion[4];

  /// Enable additional debugging information.
  std::string DebugPass;

  /// The string to embed in debug information as the current working directory.
  std::string DebugCompilationDir;

  /// The string to embed in coverage mapping as the current working directory.
  std::string CoverageCompilationDir;

  /// The string to embed in the debug information for the compile unit, if
  /// non-empty.
  std::string DwarfDebugFlags;

  /// The string containing the commandline for the llvm.commandline metadata,
  /// if non-empty.
  std::string RecordCommandLine;

  std::map<std::string, std::string> DebugPrefixMap;
  std::map<std::string, std::string> CoveragePrefixMap;

  /// The ABI to use for passing floating point arguments.
  std::string FloatABI;

  /// The file to use for dumping bug report by `Debugify` for original
  /// debug info.
  std::string DIBugsReportFilePath;

  /// The floating-point denormal mode to use.
  llvm::DenormalMode FPDenormalMode = llvm::DenormalMode::getIEEE();

  /// The floating-point denormal mode to use, for float.
  llvm::DenormalMode FP32DenormalMode = llvm::DenormalMode::getIEEE();

  /// The float precision limit to use, if non-empty.
  std::string LimitFloatPrecision;

  struct BitcodeFileToLink {
    /// The filename of the bitcode file to link in.
    std::string Filename;
    /// If true, we set attributes functions in the bitcode library according to
    /// our CodeGenOptions, much as we set attrs on functions that we generate
    /// ourselves.
    bool PropagateAttrs = false;
    /// If true, we use LLVM module internalizer.
    bool Internalize = false;
    /// Bitwise combination of llvm::Linker::Flags, passed to the LLVM linker.
    unsigned LinkFlags = 0;
  };

  /// The files specified here are linked in to the module before optimizations.
  std::vector<BitcodeFileToLink> LinkBitcodeFiles;

  /// The user provided name for the "main file", if non-empty. This is useful
  /// in situations where the input file name does not match the original input
  /// file, for example with -save-temps.
  std::string MainFileName;

  /// The name for the split debug info file used for the DW_AT_[GNU_]dwo_name
  /// attribute in the skeleton CU.
  std::string SplitDwarfFile;

  /// Output filename for the split debug info, not used in the skeleton CU.
  std::string SplitDwarfOutput;

  /// The name of the relocation model to use.
  llvm::Reloc::Model RelocationModel;

  /// If not an empty string, trap intrinsics are lowered to calls to this
  /// function instead of to trap instructions.
  std::string TrapFuncName;

  /// A list of dependent libraries.
  std::vector<std::string> DependentLibraries;

  /// A list of linker options to embed in the object file.
  std::vector<std::string> LinkerOptions;

  /// Name of the profile file to use as output for -fprofile-instr-generate,
  /// -fprofile-generate, and -fcs-profile-generate.
  std::string InstrProfileOutput;

  /// Name of the profile file to use with -fprofile-sample-use.
  std::string SampleProfileFile;

  /// Name of the profile file to use as output for with -fmemory-profile.
  std::string MemoryProfileOutput;

  /// Name of the profile file to use as input for -fprofile-instr-use
  std::string ProfileInstrumentUsePath;

  /// Name of the profile remapping file to apply to the profile data supplied
  /// by -fprofile-sample-use or -fprofile-instr-use.
  std::string ProfileRemappingFile;

  /// Name of the function summary index file to use for ThinLTO function
  /// importing.
  std::string ThinLTOIndexFile;

  /// Name of a file that can optionally be written with minimized bitcode
  /// to be used as input for the ThinLTO thin link step, which only needs
  /// the summary and module symbol table (and not, e.g. any debug metadata).
  std::string ThinLinkBitcodeFile;

  /// Prefix to use for -save-temps output.
  std::string SaveTempsFilePrefix;

  /// Name of file passed with -fcuda-include-gpubinary option to forward to
  /// CUDA runtime back-end for incorporating them into host-side object file.
  std::string CudaGpuBinaryFileName;

  /// The name of the file to which the backend should save YAML optimization
  /// records.
  std::string OptRecordFile;

  /// The regex that filters the passes that should be saved to the optimization
  /// records.
  std::string OptRecordPasses;

  /// The format used for serializing remarks (default: YAML)
  std::string OptRecordFormat;

  /// The name of the partition that symbols are assigned to, specified with
  /// -fsymbol-partition (see https://lld.llvm.org/Partitions.html).
  std::string SymbolPartition;

  enum RemarkKind {
    RK_Missing,            // Remark argument not present on the command line.
    RK_Enabled,            // Remark enabled via '-Rgroup'.
    RK_EnabledEverything,  // Remark enabled via '-Reverything'.
    RK_Disabled,           // Remark disabled via '-Rno-group'.
    RK_DisabledEverything, // Remark disabled via '-Rno-everything'.
    RK_WithPattern,        // Remark pattern specified via '-Rgroup=regexp'.
  };

  /// Optimization remark with an optional regular expression pattern.
  struct OptRemark {
    RemarkKind Kind;
    std::string Pattern;
    std::shared_ptr<llvm::Regex> Regex;

    /// By default, optimization remark is missing.
    OptRemark() : Kind(RK_Missing), Pattern(""), Regex(nullptr) {}

    /// Returns true iff the optimization remark holds a valid regular
    /// expression.
    bool hasValidPattern() const { return Regex != nullptr; }

    /// Matches the given string against the regex, if there is some.
    bool patternMatches(StringRef String) const {
      return hasValidPattern() && Regex->match(String);
    }
  };

  /// Selected optimizations for which we should enable optimization remarks.
  /// Transformation passes whose name matches the contained (optional) regular
  /// expression (and support this feature), will emit a diagnostic whenever
  /// they perform a transformation.
  OptRemark OptimizationRemark;

  /// Selected optimizations for which we should enable missed optimization
  /// remarks. Transformation passes whose name matches the contained (optional)
  /// regular expression (and support this feature), will emit a diagnostic
  /// whenever they tried but failed to perform a transformation.
  OptRemark OptimizationRemarkMissed;

  /// Selected optimizations for which we should enable optimization analyses.
  /// Transformation passes whose name matches the contained (optional) regular
  /// expression (and support this feature), will emit a diagnostic whenever
  /// they want to explain why they decided to apply or not apply a given
  /// transformation.
  OptRemark OptimizationRemarkAnalysis;

  /// Set of files defining the rules for the symbol rewriting.
  std::vector<std::string> RewriteMapFiles;

  /// Set of sanitizer checks that are non-fatal (i.e. execution should be
  /// continued when possible).
  SanitizerSet SanitizeRecover;

  /// Set of sanitizer checks that trap rather than diagnose.
  SanitizerSet SanitizeTrap;

  /// List of backend command-line options for -fembed-bitcode.
  std::vector<uint8_t> CmdArgs;

  /// A list of all -fno-builtin-* function names (e.g., memset).
  std::vector<std::string> NoBuiltinFuncs;

  std::vector<std::string> Reciprocals;

  /// The preferred width for auto-vectorization transforms. This is intended to
  /// override default transforms based on the width of the architected vector
  /// registers.
  std::string PreferVectorWidth;

  /// Set of XRay instrumentation kinds to emit.
  XRayInstrSet XRayInstrumentationBundle;

  std::vector<std::string> DefaultFunctionAttrs;

  /// List of dynamic shared object files to be loaded as pass plugins.
  std::vector<std::string> PassPlugins;

  /// Path to allowlist file specifying which objects
  /// (files, functions) should exclusively be instrumented
  /// by sanitizer coverage pass.
  std::vector<std::string> SanitizeCoverageAllowlistFiles;

  /// The guard style used for stack protector to get a initial value, this
  /// value usually be gotten from TLS or get from __stack_chk_guard, or some
  /// other styles we may implement in the future.
  std::string StackProtectorGuard;

  /// The TLS base register when StackProtectorGuard is "tls", or register used
  /// to store the stack canary for "sysreg".
  /// On x86 this can be "fs" or "gs".
  /// On AArch64 this can only be "sp_el0".
  std::string StackProtectorGuardReg;

  /// Path to ignorelist file specifying which objects
  /// (files, functions) listed for instrumentation by sanitizer
  /// coverage pass should actually not be instrumented.
  std::vector<std::string> SanitizeCoverageIgnorelistFiles;

  /// Name of the stack usage file (i.e., .su file) if user passes
  /// -fstack-usage. If empty, it can be implied that -fstack-usage is not
  /// passed on the command line.
  std::string StackUsageOutput;

  /// Executable and command-line used to create a given CompilerInvocation.
  /// Most of the time this will be the full -cc1 command.
  const char *Argv0 = nullptr;
  ArrayRef<const char *> CommandLineArgs;

  /// The minimum hotness value a diagnostic needs in order to be included in
  /// optimization diagnostics.
  ///
  /// The threshold is an Optional value, which maps to one of the 3 states:
  /// 1. 0            => threshold disabled. All remarks will be printed.
  /// 2. positive int => manual threshold by user. Remarks with hotness exceed
  ///                    threshold will be printed.
  /// 3. None         => 'auto' threshold by user. The actual value is not
  ///                    available at command line, but will be synced with
  ///                    hotness threshold from profile summary during
  ///                    compilation.
  ///
  /// If threshold option is not specified, it is disabled by default.
  Optional<uint64_t> DiagnosticsHotnessThreshold = 0;

public:
  // Define accessors/mutators for code generation options of enumeration type.
#define CODEGENOPT(Name, Bits, Default)
#define ENUM_CODEGENOPT(Name, Type, Bits, Default) \
  Type get##Name() const { return static_cast<Type>(Name); } \
  void set##Name(Type Value) { Name = static_cast<unsigned>(Value); }
#include "clang/Basic/CodeGenOptions.def"

  CodeGenOptions();

  const std::vector<std::string> &getNoBuiltinFuncs() const {
    return NoBuiltinFuncs;
  }

  /// Check if Clang profile instrumenation is on.
  bool hasProfileClangInstr() const {
    return getProfileInstr() == ProfileClangInstr;
  }

  /// Check if IR level profile instrumentation is on.
  bool hasProfileIRInstr() const {
    return getProfileInstr() == ProfileIRInstr;
  }

  /// Check if CS IR level profile instrumentation is on.
  bool hasProfileCSIRInstr() const {
    return getProfileInstr() == ProfileCSIRInstr;
  }

  /// Check if Clang profile use is on.
  bool hasProfileClangUse() const {
    return getProfileUse() == ProfileClangInstr;
  }

  /// Check if IR level profile use is on.
  bool hasProfileIRUse() const {
    return getProfileUse() == ProfileIRInstr ||
           getProfileUse() == ProfileCSIRInstr;
  }

  /// Check if CSIR profile use is on.
  bool hasProfileCSIRUse() const { return getProfileUse() == ProfileCSIRInstr; }

  /// Check if type and variable info should be emitted.
  bool hasReducedDebugInfo() const {
    return getDebugInfo() >= codegenoptions::DebugInfoConstructor;
  }

  /// Check if maybe unused type info should be emitted.
  bool hasMaybeUnusedDebugInfo() const {
    return getDebugInfo() >= codegenoptions::UnusedTypeInfo;
  }

  // Check if any one of SanitizeCoverage* is enabled.
  bool hasSanitizeCoverage() const {
    return SanitizeCoverageType || SanitizeCoverageIndirectCalls ||
           SanitizeCoverageTraceCmp;
  }
};

}  // end namespace clang

#endif