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//===-- 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; }
};
/// FunctionAliasPass - Enables a user of KLEE to specify aliases to functions
/// using -function-alias=<name|pattern>:<replacement> which are injected as
/// GlobalAliases into the module. The replaced function is removed.
class FunctionAliasPass : public llvm::ModulePass {
public:
static char ID;
FunctionAliasPass() : llvm::ModulePass(ID) {}
bool runOnModule(llvm::Module &M) override;
private:
static const llvm::FunctionType *getFunctionType(const llvm::GlobalValue *gv);
static bool checkType(const llvm::GlobalValue *match, const llvm::GlobalValue *replacement);
static bool tryToReplace(llvm::GlobalValue *match, llvm::GlobalValue *replacement);
static bool isFunctionOrGlobalFunctionAlias(const llvm::GlobalValue *gv);
};
#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
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