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_DIFFLOG_H_
  15 #define _LLVM_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)
  42       : consumer(c), Format(Format) {}
  43
  44     LogBuilder &operator<<(Value *V) {
  45       Arguments.push_back(V);
  46       return *this;
  47     }
  48
  49     ~LogBuilder();
  50
  51     StringRef getFormat() const;
  52     unsigned getNumArguments() const;
  53     Value *getArgument(unsigned I) const;
  54   };
  55
  56   /// A temporary-object class for building up diff messages.
  57   class DiffLogBuilder {
  58     typedef std::pair<Instruction*,Instruction*> DiffRecord;
  59     SmallVector<DiffRecord, 20> Diff;
  60
  61     Consumer &consumer;
  62
  63   public:
  64     DiffLogBuilder(Consumer &c) : consumer(c) {}
  65     ~DiffLogBuilder();
  66
  67     void addMatch(Instruction *L, Instruction *R);
  68     // HACK: VS 2010 has a bug in the stdlib that requires this.
  69     void addLeft(Instruction *L);
  70     void addRight(Instruction *R);
  71
  72     unsigned getNumLines() const;
  73     DiffChange getLineKind(unsigned I) const;
  74     Instruction *getLeft(unsigned I) const;
  75     Instruction *getRight(unsigned I) const;
  76   };
  77
  78 }
  79
  80 #endif