tools/llvm-diff/DiffLog.h

   1 //===-- DiffLog.h - Difference Log Builder and accessories ------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This header defines the interface to the LLVM difference log builder.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LLVM_TOOLS_LLVM_DIFF_DIFFLOG_H
  15 #define LLVM_TOOLS_LLVM_DIFF_DIFFLOG_H
  16
  17 #include "llvm/ADT/SmallVector.h"
  18 #include "llvm/ADT/StringRef.h"
  19
  20 namespace llvm {
  21   class Instruction;
  22   class Value;
  23   class Consumer;
  24
  25   /// Trichotomy assumption
  26   enum DiffChange { DC_match, DC_left, DC_right };
  27
  28   /// A temporary-object class for building up log messages.
  29   class LogBuilder {
  30     Consumer *consumer;
  31
  32     /// The use of a stored StringRef here is okay because
  33     /// LogBuilder should be used only as a temporary, and as a
  34     /// temporary it will be destructed before whatever temporary
  35     /// might be initializing this format.
  36     StringRef Format;
  37
  38     SmallVector<Value*, 4> Arguments;
  39
  40   public:
  41     LogBuilder(Consumer &c, StringRef Format) : consumer(&c), Format(Format) {}
  42     LogBuilder(LogBuilder &&L)
  43         : consumer(L.consumer), Format(L.Format),
  44           Arguments(std::move(L.Arguments)) {
  45       L.consumer = nullptr;
  46     }
  47
  48     LogBuilder &operator<<(Value *V) {
  49       Arguments.push_back(V);
  50       return *this;
  51     }
  52
  53     ~LogBuilder();
  54
  55     StringRef getFormat() const;
  56     unsigned getNumArguments() const;
  57     Value *getArgument(unsigned I) const;
  58   };
  59
  60   /// A temporary-object class for building up diff messages.
  61   class DiffLogBuilder {
  62     typedef std::pair<Instruction*,Instruction*> DiffRecord;
  63     SmallVector<DiffRecord, 20> Diff;
  64
  65     Consumer &consumer;
  66
  67   public:
  68     DiffLogBuilder(Consumer &c) : consumer(c) {}
  69     ~DiffLogBuilder();
  70
  71     void addMatch(Instruction *L, Instruction *R);
  72     // HACK: VS 2010 has a bug in the stdlib that requires this.
  73     void addLeft(Instruction *L);
  74     void addRight(Instruction *R);
  75
  76     unsigned getNumLines() const;
  77     DiffChange getLineKind(unsigned I) const;
  78     Instruction *getLeft(unsigned I) const;
  79     Instruction *getRight(unsigned I) const;
  80   };
  81
  82 }
  83
  84 #endif