1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
//===- LoopPass.h - LoopPass class ----------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines LoopPass class. All loop optimization
// and transformation passes are derived from LoopPass.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_LOOPPASS_H
#define LLVM_ANALYSIS_LOOPPASS_H
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/IR/LegacyPassManagers.h"
#include "llvm/Pass.h"
#include <deque>
namespace llvm {
class LPPassManager;
class Function;
class PMStack;
class LoopPass : public Pass {
public:
explicit LoopPass(char &pid) : Pass(PT_Loop, pid) {}
/// getPrinterPass - Get a pass to print the function corresponding
/// to a Loop.
Pass *createPrinterPass(raw_ostream &O,
const std::string &Banner) const override;
// runOnLoop - This method should be implemented by the subclass to perform
// whatever action is necessary for the specified Loop.
virtual bool runOnLoop(Loop *L, LPPassManager &LPM) = 0;
using llvm::Pass::doInitialization;
using llvm::Pass::doFinalization;
// Initialization and finalization hooks.
virtual bool doInitialization(Loop *L, LPPassManager &LPM) {
return false;
}
// Finalization hook does not supply Loop because at this time
// loop nest is completely different.
virtual bool doFinalization() { return false; }
// Check if this pass is suitable for the current LPPassManager, if
// available. This pass P is not suitable for a LPPassManager if P
// is not preserving higher level analysis info used by other
// LPPassManager passes. In such case, pop LPPassManager from the
// stack. This will force assignPassManager() to create new
// LPPassManger as expected.
void preparePassManager(PMStack &PMS) override;
/// Assign pass manager to manage this pass
void assignPassManager(PMStack &PMS, PassManagerType PMT) override;
/// Return what kind of Pass Manager can manage this pass.
PassManagerType getPotentialPassManagerType() const override {
return PMT_LoopPassManager;
}
//===--------------------------------------------------------------------===//
/// SimpleAnalysis - Provides simple interface to update analysis info
/// maintained by various passes. Note, if required this interface can
/// be extracted into a separate abstract class but it would require
/// additional use of multiple inheritance in Pass class hierarchy, something
/// we are trying to avoid.
/// Each loop pass can override these simple analysis hooks to update
/// desired analysis information.
/// cloneBasicBlockAnalysis - Clone analysis info associated with basic block.
virtual void cloneBasicBlockAnalysis(BasicBlock *F, BasicBlock *T, Loop *L) {}
/// deleteAnalysisValue - Delete analysis info associated with value V.
virtual void deleteAnalysisValue(Value *V, Loop *L) {}
/// Delete analysis info associated with Loop L.
/// Called to notify a Pass that a loop has been deleted and any
/// associated analysis values can be deleted.
virtual void deleteAnalysisLoop(Loop *L) {}
protected:
/// skipOptnoneFunction - Containing function has Attribute::OptimizeNone
/// and most transformation passes should skip it.
bool skipOptnoneFunction(const Loop *L) const;
};
class LPPassManager : public FunctionPass, public PMDataManager {
public:
static char ID;
explicit LPPassManager();
/// run - Execute all of the passes scheduled for execution. Keep track of
/// whether any of the passes modifies the module, and if so, return true.
bool runOnFunction(Function &F) override;
/// Pass Manager itself does not invalidate any analysis info.
// LPPassManager needs LoopInfo.
void getAnalysisUsage(AnalysisUsage &Info) const override;
const char *getPassName() const override {
return "Loop Pass Manager";
}
PMDataManager *getAsPMDataManager() override { return this; }
Pass *getAsPass() override { return this; }
/// Print passes managed by this manager
void dumpPassStructure(unsigned Offset) override;
LoopPass *getContainedPass(unsigned N) {
assert(N < PassVector.size() && "Pass number out of range!");
LoopPass *LP = static_cast<LoopPass *>(PassVector[N]);
return LP;
}
PassManagerType getPassManagerType() const override {
return PMT_LoopPassManager;
}
public:
// Delete loop from the loop queue and loop nest (LoopInfo).
void deleteLoopFromQueue(Loop *L);
// Insert loop into the loop queue and add it as a child of the
// given parent.
void insertLoop(Loop *L, Loop *ParentLoop);
// Insert a loop into the loop queue.
void insertLoopIntoQueue(Loop *L);
// Reoptimize this loop. LPPassManager will re-insert this loop into the
// queue. This allows LoopPass to change loop nest for the loop. This
// utility may send LPPassManager into infinite loops so use caution.
void redoLoop(Loop *L);
//===--------------------------------------------------------------------===//
/// SimpleAnalysis - Provides simple interface to update analysis info
/// maintained by various passes. Note, if required this interface can
/// be extracted into a separate abstract class but it would require
/// additional use of multiple inheritance in Pass class hierarchy, something
/// we are trying to avoid.
/// cloneBasicBlockSimpleAnalysis - Invoke cloneBasicBlockAnalysis hook for
/// all passes that implement simple analysis interface.
void cloneBasicBlockSimpleAnalysis(BasicBlock *From, BasicBlock *To, Loop *L);
/// deleteSimpleAnalysisValue - Invoke deleteAnalysisValue hook for all passes
/// that implement simple analysis interface.
void deleteSimpleAnalysisValue(Value *V, Loop *L);
/// Invoke deleteAnalysisLoop hook for all passes that implement simple
/// analysis interface.
void deleteSimpleAnalysisLoop(Loop *L);
private:
std::deque<Loop *> LQ;
bool skipThisLoop;
bool redoThisLoop;
LoopInfo *LI;
Loop *CurrentLoop;
};
} // End llvm namespace
#endif
|
