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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
//===-- Passes.h ------------------------------------------------*- C++ -*-===//
//
// The KLEE Symbolic Virtual Machine
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef KLEE_PASSES_H
#define KLEE_PASSES_H
#include "klee/Config/Version.h"
#include "llvm/ADT/Triple.h"
#include "llvm/CodeGen/IntrinsicLowering.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Module.h"
#include "llvm/Pass.h"
namespace llvm {
class Function;
class Instruction;
class Module;
class DataLayout;
class TargetLowering;
class Type;
} // namespace llvm
namespace klee {
/// RaiseAsmPass - This pass raises some common occurences of inline
/// asm which are used by glibc into normal LLVM IR.
class RaiseAsmPass : public llvm::ModulePass {
static char ID;
const llvm::TargetLowering *TLI;
llvm::Triple triple;
llvm::Function *getIntrinsic(llvm::Module &M, unsigned IID, llvm::Type **Tys,
unsigned NumTys);
llvm::Function *getIntrinsic(llvm::Module &M, unsigned IID, llvm::Type *Ty0) {
return getIntrinsic(M, IID, &Ty0, 1);
}
bool runOnInstruction(llvm::Module &M, llvm::Instruction *I);
public:
RaiseAsmPass() : llvm::ModulePass(ID), TLI(0) {}
bool runOnModule(llvm::Module &M) override;
};
// This is a module pass because it can add and delete module
// variables (via intrinsic lowering).
class IntrinsicCleanerPass : public llvm::ModulePass {
static char ID;
const llvm::DataLayout &DataLayout;
llvm::IntrinsicLowering *IL;
bool runOnBasicBlock(llvm::BasicBlock &b, llvm::Module &M);
public:
IntrinsicCleanerPass(const llvm::DataLayout &TD)
: llvm::ModulePass(ID), DataLayout(TD),
IL(new llvm::IntrinsicLowering(TD)) {}
~IntrinsicCleanerPass() { delete IL; }
bool runOnModule(llvm::Module &M) override;
};
// performs two transformations which make interpretation
// easier and faster.
//
// 1) Ensure that all the PHI nodes in a basic block have
// the incoming block list in the same order. Thus the
// incoming block index only needs to be computed once
// for each transfer.
//
// 2) Ensure that no PHI node result is used as an argument to
// a subsequent PHI node in the same basic block. This allows
// the transfer to execute the instructions in order instead
// of in two passes.
class PhiCleanerPass : public llvm::FunctionPass {
static char ID;
public:
PhiCleanerPass() : llvm::FunctionPass(ID) {}
bool runOnFunction(llvm::Function &f) override;
};
class DivCheckPass : public llvm::ModulePass {
static char ID;
public:
DivCheckPass() : ModulePass(ID) {}
bool runOnModule(llvm::Module &M) override;
};
/// This pass injects checks to check for overshifting.
///
/// Overshifting is where a Shl, LShr or AShr is performed
/// where the shift amount is greater than width of the bitvector
/// being shifted.
/// In LLVM (and in C/C++) this undefined behaviour!
///
/// Example:
/// \code
/// unsigned char x=15;
/// x << 4 ; // Defined behaviour
/// x << 8 ; // Undefined behaviour
/// x << 255 ; // Undefined behaviour
/// \endcode
class OvershiftCheckPass : public llvm::ModulePass {
static char ID;
public:
OvershiftCheckPass() : ModulePass(ID) {}
bool runOnModule(llvm::Module &M) override;
};
/// LowerSwitchPass - Replace all SwitchInst instructions with chained branch
/// instructions. Note that this cannot be a BasicBlock pass because it
/// modifies the CFG!
class LowerSwitchPass : public llvm::FunctionPass {
public:
static char ID; // Pass identification, replacement for typeid
LowerSwitchPass() : FunctionPass(ID) {}
bool runOnFunction(llvm::Function &F) override;
struct SwitchCase {
llvm ::Constant *value;
llvm::BasicBlock *block;
SwitchCase() : value(0), block(0) {}
SwitchCase(llvm::Constant *v, llvm::BasicBlock *b) : value(v), block(b) {}
};
typedef std::vector<SwitchCase> CaseVector;
typedef std::vector<SwitchCase>::iterator CaseItr;
private:
void processSwitchInst(llvm::SwitchInst *SI);
void switchConvert(CaseItr begin, CaseItr end, llvm::Value *value,
llvm::BasicBlock *origBlock,
llvm::BasicBlock *defaultBlock);
};
/// InstructionOperandTypeCheckPass - Type checks the types of instruction
/// operands to check that they conform to invariants expected by the Executor.
///
/// This is a ModulePass because other pass types are not meant to maintain
/// state between calls.
class InstructionOperandTypeCheckPass : public llvm::ModulePass {
private:
bool instructionOperandsConform;
public:
static char ID;
InstructionOperandTypeCheckPass()
: llvm::ModulePass(ID), instructionOperandsConform(true) {}
bool runOnModule(llvm::Module &M) override;
bool checkPassed() const { return instructionOperandsConform; }
};
#ifdef USE_WORKAROUND_LLVM_PR39177
/// WorkaroundLLVMPR39177Pass - Workaround for LLVM PR39177 within KLEE repo.
/// For more information on this, please refer to the comments in
/// cmake/workaround_llvm_pr39177.cmake
class WorkaroundLLVMPR39177Pass : public llvm::ModulePass {
public:
static char ID;
WorkaroundLLVMPR39177Pass() : llvm::ModulePass(ID) {}
bool runOnModule(llvm::Module &M) override;
};
#endif
/// Instruments every function that contains a KLEE function call as nonopt
class OptNonePass : public llvm::ModulePass {
public:
static char ID;
OptNonePass() : llvm::ModulePass(ID) {}
bool runOnModule(llvm::Module &M) override;
};
} // namespace klee
#endif
|
