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
|
//===- 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/AliasAnalysisCounter.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);
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();
}
AliasAnalysisCounter::AliasAnalysisCounter() : ModulePass(ID) {
initializeAliasAnalysisCounterPass(*PassRegistry::getPassRegistry());
No = May = Partial = Must = 0;
NoMR = JustRef = JustMod = MR = 0;
}
static void printLine(const char *Desc, unsigned Val, unsigned Sum) {
errs() << " " << Val << " " << Desc << " responses (" << Val * 100 / Sum
<< "%)\n";
}
AliasAnalysisCounter::~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 MRI_Mod/MRI_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() << " MRI_Mod/MRI_Ref Analysis Counter Summary: "
<< NoMR * 100 / MRSum << "%/" << JustRef * 100 / MRSum << "%/"
<< JustMod * 100 / MRSum << "%/" << MR * 100 / MRSum << "%\n\n";
}
}
}
bool AliasAnalysisCounter::runOnModule(Module &M) {
this->M = &M;
InitializeAliasAnalysis(this, &M.getDataLayout());
return false;
}
void AliasAnalysisCounter::getAnalysisUsage(AnalysisUsage &AU) const {
AliasAnalysis::getAnalysisUsage(AU);
AU.addRequired<AliasAnalysis>();
AU.setPreservesAll();
}
void *AliasAnalysisCounter::getAdjustedAnalysisPointer(AnalysisID PI) {
if (PI == &AliasAnalysis::ID)
return (AliasAnalysis *)this;
return this;
}
AliasResult AliasAnalysisCounter::alias(const MemoryLocation &LocA,
const MemoryLocation &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;
}
ModRefInfo AliasAnalysisCounter::getModRefInfo(ImmutableCallSite CS,
const MemoryLocation &Loc) {
ModRefInfo R = getAnalysis<AliasAnalysis>().getModRefInfo(CS, Loc);
const char *MRString = nullptr;
switch (R) {
case MRI_NoModRef:
NoMR++;
MRString = "MRI_NoModRef";
break;
case MRI_Ref:
JustRef++;
MRString = "JustRef";
break;
case MRI_Mod:
JustMod++;
MRString = "JustMod";
break;
case MRI_ModRef:
MR++;
MRString = "MRI_ModRef";
break;
}
if (PrintAll || (PrintAllFailures && R == MRI_ModRef)) {
errs() << MRString << ": Ptr: ";
errs() << "[" << Loc.Size << "B] ";
Loc.Ptr->printAsOperand(errs(), true, M);
errs() << "\t<->" << *CS.getInstruction() << '\n';
}
return R;
}
|
