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comparison llvm/tools/llvm-diff/DifferenceEngine.h @ 150:1d019706d866

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LLVM10
author anatofuz
date Thu, 13 Feb 2020 15:10:13 +0900
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147:c2174574ed3a 150:1d019706d866
1 //===-- DifferenceEngine.h - Module comparator ------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This header defines the interface to the LLVM difference engine,
10 // which structurally compares functions within a module.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #ifndef LLVM_TOOLS_LLVM_DIFF_DIFFERENCEENGINE_H
15 #define LLVM_TOOLS_LLVM_DIFF_DIFFERENCEENGINE_H
16
17 #include "DiffConsumer.h"
18 #include "DiffLog.h"
19 #include "llvm/ADT/StringRef.h"
20 #include <utility>
21
22 namespace llvm {
23 class Function;
24 class GlobalValue;
25 class Instruction;
26 class LLVMContext;
27 class Module;
28 class Twine;
29 class Value;
30
31 /// A class for performing structural comparisons of LLVM assembly.
32 class DifferenceEngine {
33 public:
34 /// A RAII object for recording the current context.
35 struct Context {
36 Context(DifferenceEngine &Engine, Value *L, Value *R) : Engine(Engine) {
37 Engine.consumer.enterContext(L, R);
38 }
39
40 ~Context() {
41 Engine.consumer.exitContext();
42 }
43
44 private:
45 DifferenceEngine &Engine;
46 };
47
48 /// An oracle for answering whether two values are equivalent as
49 /// operands.
50 class Oracle {
51 virtual void anchor();
52 public:
53 virtual bool operator()(Value *L, Value *R) = 0;
54
55 protected:
56 virtual ~Oracle() {}
57 };
58
59 DifferenceEngine(Consumer &consumer)
60 : consumer(consumer), globalValueOracle(nullptr) {}
61
62 void diff(Module *L, Module *R);
63 void diff(Function *L, Function *R);
64 void log(StringRef text) {
65 consumer.log(text);
66 }
67 LogBuilder logf(StringRef text) {
68 return LogBuilder(consumer, text);
69 }
70 Consumer& getConsumer() const { return consumer; }
71
72 /// Installs an oracle to decide whether two global values are
73 /// equivalent as operands. Without an oracle, global values are
74 /// considered equivalent as operands precisely when they have the
75 /// same name.
76 void setGlobalValueOracle(Oracle *oracle) {
77 globalValueOracle = oracle;
78 }
79
80 /// Determines whether two global values are equivalent.
81 bool equivalentAsOperands(GlobalValue *L, GlobalValue *R);
82
83 private:
84 Consumer &consumer;
85 Oracle *globalValueOracle;
86 };
87 }
88
89 #endif