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
|
//===- AliasAnalysisCounter.cpp - Alias Analysis Query Counter ------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements a pass which can be used to count how many alias queries
// are being made and how the alias analysis implementation being used responds.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/Passes.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/IR/Module.h"
#include "llvm/Pass.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
static cl::opt<bool>
PrintAll("count-aa-print-all-queries", cl::ReallyHidden, cl::init(true));
static cl::opt<bool>
PrintAllFailures("count-aa-print-all-failed-queries", cl::ReallyHidden);
namespace {
class AliasAnalysisCounter : public ModulePass, public AliasAnalysis {
unsigned No, May, Partial, Must;
unsigned NoMR, JustRef, JustMod, MR;
Module *M;
public:
static char ID; // Class identification, replacement for typeinfo
AliasAnalysisCounter() : ModulePass(ID) {
initializeAliasAnalysisCounterPass(*PassRegistry::getPassRegistry());
No = May = Partial = Must = 0;
NoMR = JustRef = JustMod = MR = 0;
}
void printLine(const char *Desc, unsigned Val, unsigned Sum) {
errs() << " " << Val << " " << Desc << " responses ("
<< Val*100/Sum << "%)\n";
}
~AliasAnalysisCounter() {
unsigned AASum = No+May+Partial+Must;
unsigned MRSum = NoMR+JustRef+JustMod+MR;
if (AASum + MRSum) { // Print a report if any counted queries occurred...
errs() << "\n===== Alias Analysis Counter Report =====\n"
<< " Analysis counted:\n"
<< " " << AASum << " Total Alias Queries Performed\n";
if (AASum) {
printLine("no alias", No, AASum);
printLine("may alias", May, AASum);
printLine("partial alias", Partial, AASum);
printLine("must alias", Must, AASum);
errs() << " Alias Analysis Counter Summary: " << No*100/AASum << "%/"
<< May*100/AASum << "%/"
<< Partial*100/AASum << "%/"
<< Must*100/AASum<<"%\n\n";
}
errs() << " " << MRSum << " Total Mod/Ref Queries Performed\n";
if (MRSum) {
printLine("no mod/ref", NoMR, MRSum);
printLine("ref", JustRef, MRSum);
printLine("mod", JustMod, MRSum);
printLine("mod/ref", MR, MRSum);
errs() << " Mod/Ref Analysis Counter Summary: " <<NoMR*100/MRSum
<< "%/" << JustRef*100/MRSum << "%/" << JustMod*100/MRSum
<< "%/" << MR*100/MRSum <<"%\n\n";
}
}
}
bool runOnModule(Module &M) override {
this->M = &M;
InitializeAliasAnalysis(this, &M.getDataLayout());
return false;
}
void getAnalysisUsage(AnalysisUsage &AU) const override {
AliasAnalysis::getAnalysisUsage(AU);
AU.addRequired<AliasAnalysis>();
AU.setPreservesAll();
}
/// getAdjustedAnalysisPointer - This method is used when a pass implements
/// an analysis interface through multiple inheritance. If needed, it
/// should override this to adjust the this pointer as needed for the
/// specified pass info.
void *getAdjustedAnalysisPointer(AnalysisID PI) override {
if (PI == &AliasAnalysis::ID)
return (AliasAnalysis*)this;
return this;
}
// FIXME: We could count these too...
bool pointsToConstantMemory(const Location &Loc, bool OrLocal) override {
return getAnalysis<AliasAnalysis>().pointsToConstantMemory(Loc, OrLocal);
}
// Forwarding functions: just delegate to a real AA implementation, counting
// the number of responses...
AliasResult alias(const Location &LocA, const Location &LocB) override;
ModRefResult getModRefInfo(ImmutableCallSite CS,
const Location &Loc) override;
ModRefResult getModRefInfo(ImmutableCallSite CS1,
ImmutableCallSite CS2) override {
return AliasAnalysis::getModRefInfo(CS1,CS2);
}
};
}
char AliasAnalysisCounter::ID = 0;
INITIALIZE_AG_PASS(AliasAnalysisCounter, AliasAnalysis, "count-aa",
"Count Alias Analysis Query Responses", false, true, false)
ModulePass *llvm::createAliasAnalysisCounterPass() {
return new AliasAnalysisCounter();
}
AliasAnalysis::AliasResult
AliasAnalysisCounter::alias(const Location &LocA, const Location &LocB) {
AliasResult R = getAnalysis<AliasAnalysis>().alias(LocA, LocB);
const char *AliasString = nullptr;
switch (R) {
case NoAlias: No++; AliasString = "No alias"; break;
case MayAlias: May++; AliasString = "May alias"; break;
case PartialAlias: Partial++; AliasString = "Partial alias"; break;
case MustAlias: Must++; AliasString = "Must alias"; break;
}
if (PrintAll || (PrintAllFailures && R == MayAlias)) {
errs() << AliasString << ":\t";
errs() << "[" << LocA.Size << "B] ";
LocA.Ptr->printAsOperand(errs(), true, M);
errs() << ", ";
errs() << "[" << LocB.Size << "B] ";
LocB.Ptr->printAsOperand(errs(), true, M);
errs() << "\n";
}
return R;
}
AliasAnalysis::ModRefResult
AliasAnalysisCounter::getModRefInfo(ImmutableCallSite CS,
const Location &Loc) {
ModRefResult R = getAnalysis<AliasAnalysis>().getModRefInfo(CS, Loc);
const char *MRString = nullptr;
switch (R) {
case NoModRef: NoMR++; MRString = "NoModRef"; break;
case Ref: JustRef++; MRString = "JustRef"; break;
case Mod: JustMod++; MRString = "JustMod"; break;
case ModRef: MR++; MRString = "ModRef"; break;
}
if (PrintAll || (PrintAllFailures && R == ModRef)) {
errs() << MRString << ": Ptr: ";
errs() << "[" << Loc.Size << "B] ";
Loc.Ptr->printAsOperand(errs(), true, M);
errs() << "\t<->" << *CS.getInstruction() << '\n';
}
return R;
}
|
