Coverage Report

Created: 2018-09-17 19:50

/Users/buildslave/jenkins/workspace/clang-stage2-coverage-R/llvm/include/llvm/MC/SubtargetFeature.h
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//===- llvm/MC/SubtargetFeature.h - CPU characteristics ---------*- C++ -*-===//
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//
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//                     The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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/// \file Defines and manages user or tool specified CPU characteristics.
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/// The intent is to be able to package specific features that should or should
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/// not be used on a specific target processor.  A tool, such as llc, could, as
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/// as example, gather chip info from the command line, a long with features
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/// that should be used on that chip.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_SUBTARGETFEATURE_H
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#define LLVM_MC_SUBTARGETFEATURE_H
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#include "llvm/ADT/StringRef.h"
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#include <bitset>
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#include <initializer_list>
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#include <string>
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#include <vector>
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namespace llvm {
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template <typename T> class ArrayRef;
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class raw_ostream;
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class Triple;
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const unsigned MAX_SUBTARGET_FEATURES = 192;
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/// Container class for subtarget features.
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/// This is convenient because std::bitset does not have a constructor
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/// with an initializer list of set bits.
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class FeatureBitset : public std::bitset<MAX_SUBTARGET_FEATURES> {
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public:
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  // Cannot inherit constructors because it's not supported by VC++..
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  FeatureBitset() = default;
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  FeatureBitset(const bitset<MAX_SUBTARGET_FEATURES>& B) : bitset(B) {}
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  FeatureBitset(std::initializer_list<unsigned> Init) {
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    for (auto I : Init)
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      set(I);
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  }
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};
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//===----------------------------------------------------------------------===//
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/// Used to provide key value pairs for feature and CPU bit flags.
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struct SubtargetFeatureKV {
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  const char *Key;                      ///< K-V key string
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  const char *Desc;                     ///< Help descriptor
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  FeatureBitset Value;                  ///< K-V integer value
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  FeatureBitset Implies;                ///< K-V bit mask
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  /// Compare routine for std::lower_bound
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  bool operator<(StringRef S) const {
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    return StringRef(Key) < S;
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  }
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  /// Compare routine for std::is_sorted.
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  bool operator<(const SubtargetFeatureKV &Other) const {
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    return StringRef(Key) < StringRef(Other.Key);
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  }
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};
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//===----------------------------------------------------------------------===//
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/// Used to provide key value pairs for CPU and arbitrary pointers.
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struct SubtargetInfoKV {
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  const char *Key;                      ///< K-V key string
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  const void *Value;                    ///< K-V pointer value
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  /// Compare routine for std::lower_bound
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  bool operator<(StringRef S) const {
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    return StringRef(Key) < S;
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  }
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};
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//===----------------------------------------------------------------------===//
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/// Manages the enabling and disabling of subtarget specific features.
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///
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/// Features are encoded as a string of the form
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///   "+attr1,+attr2,-attr3,...,+attrN"
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/// A comma separates each feature from the next (all lowercase.)
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/// Each of the remaining features is prefixed with + or - indicating whether
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/// that feature should be enabled or disabled contrary to the cpu
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/// specification.
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class SubtargetFeatures {
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  std::vector<std::string> Features;    ///< Subtarget features as a vector
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public:
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  explicit SubtargetFeatures(StringRef Initial = "");
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  /// Returns features as a string.
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  std::string getString() const;
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  /// Adds Features.
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  void AddFeature(StringRef String, bool Enable = true);
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  /// Toggles a feature and update the feature bits.
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  static void ToggleFeature(FeatureBitset &Bits, StringRef String,
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                            ArrayRef<SubtargetFeatureKV> FeatureTable);
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  /// Applies the feature flag and update the feature bits.
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  static void ApplyFeatureFlag(FeatureBitset &Bits, StringRef Feature,
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                               ArrayRef<SubtargetFeatureKV> FeatureTable);
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  /// Returns feature bits of a CPU.
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  FeatureBitset getFeatureBits(StringRef CPU,
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                               ArrayRef<SubtargetFeatureKV> CPUTable,
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                               ArrayRef<SubtargetFeatureKV> FeatureTable);
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  /// Returns the vector of individual subtarget features.
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  const std::vector<std::string> &getFeatures() const { return Features; }
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  /// Prints feature string.
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  void print(raw_ostream &OS) const;
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  // Dumps feature info.
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  void dump() const;
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  /// Adds the default features for the specified target triple.
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  void getDefaultSubtargetFeatures(const Triple& Triple);
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};
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} // end namespace llvm
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#endif // LLVM_MC_SUBTARGETFEATURE_H