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
|
//===-- IntrinsicCleaner.cpp ----------------------------------------------===//
//
// The KLEE Symbolic Virtual Machine
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "Passes.h"
#include "klee/Config/config.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
#include "llvm/InstrTypes.h"
#include "llvm/Instruction.h"
#include "llvm/Instructions.h"
#include "llvm/IntrinsicInst.h"
#if !(LLVM_VERSION_MAJOR == 2 && LLVM_VERSION_MINOR < 7)
#include "llvm/LLVMContext.h"
#endif
#include "llvm/Module.h"
#include "llvm/Pass.h"
#include "llvm/Type.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "llvm/Target/TargetData.h"
using namespace llvm;
namespace klee {
char IntrinsicCleanerPass::ID;
bool IntrinsicCleanerPass::runOnModule(Module &M) {
bool dirty = false;
for (Module::iterator f = M.begin(), fe = M.end(); f != fe; ++f)
for (Function::iterator b = f->begin(), be = f->end(); b != be; ++b)
dirty |= runOnBasicBlock(*b);
return dirty;
}
bool IntrinsicCleanerPass::runOnBasicBlock(BasicBlock &b) {
bool dirty = false;
unsigned WordSize = TargetData.getPointerSizeInBits() / 8;
for (BasicBlock::iterator i = b.begin(), ie = b.end(); i != ie;) {
IntrinsicInst *ii = dyn_cast<IntrinsicInst>(&*i);
// increment now since LowerIntrinsic deletion makes iterator invalid.
++i;
if(ii) {
switch (ii->getIntrinsicID()) {
case Intrinsic::vastart:
case Intrinsic::vaend:
break;
// Lower vacopy so that object resolution etc is handled by
// normal instructions.
//
// FIXME: This is much more target dependent than just the word size,
// however this works for x86-32 and x86-64.
case Intrinsic::vacopy: { // (dst, src) -> *((i8**) dst) = *((i8**) src)
#if (LLVM_VERSION_MAJOR == 2 && LLVM_VERSION_MINOR < 8)
Value *dst = ii->getOperand(1);
Value *src = ii->getOperand(2);
#else
Value *dst = ii->getArgOperand(0);
Value *src = ii->getArgOperand(1);
#endif
if (WordSize == 4) {
Type *i8pp = PointerType::getUnqual(PointerType::getUnqual(Type::getInt8Ty(getGlobalContext())));
Value *castedDst = CastInst::CreatePointerCast(dst, i8pp, "vacopy.cast.dst", ii);
Value *castedSrc = CastInst::CreatePointerCast(src, i8pp, "vacopy.cast.src", ii);
Value *load = new LoadInst(castedSrc, "vacopy.read", ii);
new StoreInst(load, castedDst, false, ii);
} else {
assert(WordSize == 8 && "Invalid word size!");
Type *i64p = PointerType::getUnqual(Type::getInt64Ty(getGlobalContext()));
Value *pDst = CastInst::CreatePointerCast(dst, i64p, "vacopy.cast.dst", ii);
Value *pSrc = CastInst::CreatePointerCast(src, i64p, "vacopy.cast.src", ii);
Value *val = new LoadInst(pSrc, std::string(), ii); new StoreInst(val, pDst, ii);
Value *off = ConstantInt::get(Type::getInt64Ty(getGlobalContext()), 1);
pDst = GetElementPtrInst::Create(pDst, off, std::string(), ii);
pSrc = GetElementPtrInst::Create(pSrc, off, std::string(), ii);
val = new LoadInst(pSrc, std::string(), ii); new StoreInst(val, pDst, ii);
pDst = GetElementPtrInst::Create(pDst, off, std::string(), ii);
pSrc = GetElementPtrInst::Create(pSrc, off, std::string(), ii);
val = new LoadInst(pSrc, std::string(), ii); new StoreInst(val, pDst, ii);
}
ii->removeFromParent();
delete ii;
break;
}
#if (LLVM_VERSION_MAJOR == 2 && LLVM_VERSION_MINOR < 7)
case Intrinsic::dbg_stoppoint: {
// We can remove this stoppoint if the next instruction is
// sure to be another stoppoint. This is nice for cleanliness
// but also important for switch statements where it can allow
// the targets to be joined.
bool erase = false;
if (isa<DbgStopPointInst>(i) ||
isa<UnreachableInst>(i)) {
erase = true;
} else if (isa<BranchInst>(i) ||
isa<SwitchInst>(i)) {
BasicBlock *bb = i->getParent();
erase = true;
for (succ_iterator it=succ_begin(bb), ie=succ_end(bb);
it!=ie; ++it) {
if (!isa<DbgStopPointInst>(it->getFirstNonPHI())) {
erase = false;
break;
}
}
}
if (erase) {
ii->eraseFromParent();
dirty = true;
}
break;
}
case Intrinsic::dbg_region_start:
case Intrinsic::dbg_region_end:
case Intrinsic::dbg_func_start:
#else
case Intrinsic::dbg_value:
#endif
case Intrinsic::dbg_declare:
// Remove these regardless of lower intrinsics flag. This can
// be removed once IntrinsicLowering is fixed to not have bad
// caches.
ii->eraseFromParent();
dirty = true;
break;
default:
if (LowerIntrinsics)
IL->LowerIntrinsicCall(ii);
dirty = true;
break;
}
}
}
return dirty;
}
}
|
