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//===-- RaiseAsm.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/Version.h"
#include "llvm/InlineAsm.h"
#if LLVM_VERSION_CODE >= LLVM_VERSION(2, 7)
#include "llvm/LLVMContext.h"
#endif
#if LLVM_VERSION_CODE >= LLVM_VERSION(2, 9)
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/Host.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetRegistry.h"
#endif
using namespace llvm;
using namespace klee;
char RaiseAsmPass::ID = 0;
Function *RaiseAsmPass::getIntrinsic(llvm::Module &M,
unsigned IID,
LLVM_TYPE_Q Type **Tys,
unsigned NumTys) {
#if LLVM_VERSION_CODE >= LLVM_VERSION(3, 0)
return Intrinsic::getDeclaration(&M, (llvm::Intrinsic::ID) IID,
llvm::ArrayRef<llvm::Type*>(Tys, NumTys));
#else
return Intrinsic::getDeclaration(&M, (llvm::Intrinsic::ID) IID, Tys, NumTys);
#endif
}
// FIXME: This should just be implemented as a patch to
// X86TargetAsmInfo.cpp, then everyone will benefit.
bool RaiseAsmPass::runOnInstruction(Module &M, Instruction *I) {
if (CallInst *ci = dyn_cast<CallInst>(I)) {
if (InlineAsm *ia = dyn_cast<InlineAsm>(ci->getCalledValue())) {
#if LLVM_VERSION_CODE >= LLVM_VERSION(2, 9)
(void) ia;
return TLI && TLI->ExpandInlineAsm(ci);
#else
const std::string &as = ia->getAsmString();
const std::string &cs = ia->getConstraintString();
const llvm::Type *T = ci->getType();
// bswaps
#if LLVM_VERSION_CODE < LLVM_VERSION(2, 8)
unsigned NumOperands = ci->getNumOperands();
llvm::Value *Arg0 = NumOperands > 1 ? ci->getOperand(1) : 0;
#else
unsigned NumOperands = ci->getNumArgOperands() + 1;
llvm::Value *Arg0 = NumOperands > 1 ? ci->getArgOperand(0) : 0;
#endif
if (Arg0 && T == Arg0->getType() &&
((T == llvm::Type::getInt16Ty(getGlobalContext()) &&
as == "rorw $$8, ${0:w}" &&
cs == "=r,0,~{dirflag},~{fpsr},~{flags},~{cc}") ||
(T == llvm::Type::getInt32Ty(getGlobalContext()) &&
as == "rorw $$8, ${0:w};rorl $$16, $0;rorw $$8, ${0:w}" &&
cs == "=r,0,~{dirflag},~{fpsr},~{flags},~{cc}"))) {
Function *F = getIntrinsic(M, Intrinsic::bswap, Arg0->getType());
#if LLVM_VERSION_CODE < LLVM_VERSION(2, 8)
ci->setOperand(0, F);
#else
ci->setCalledFunction(F);
#endif
return true;
}
#endif
}
}
return false;
}
bool RaiseAsmPass::runOnModule(Module &M) {
bool changed = false;
#if LLVM_VERSION_CODE >= LLVM_VERSION(2, 9)
std::string Err;
std::string HostTriple = llvm::sys::getHostTriple();
const Target *NativeTarget = TargetRegistry::lookupTarget(HostTriple, Err);
if (NativeTarget == 0) {
llvm::errs() << "Warning: unable to select native target: " << Err << "\n";
TLI = 0;
} else {
#if LLVM_VERSION_CODE >= LLVM_VERSION(3, 0)
TargetMachine *TM = NativeTarget->createTargetMachine(HostTriple, "", "");
#else
TargetMachine *TM = NativeTarget->createTargetMachine(HostTriple, "");
#endif
TLI = TM->getTargetLowering();
}
#endif
for (Module::iterator fi = M.begin(), fe = M.end(); fi != fe; ++fi) {
for (Function::iterator bi = fi->begin(), be = fi->end(); bi != be; ++bi) {
for (BasicBlock::iterator ii = bi->begin(), ie = bi->end(); ii != ie;) {
Instruction *i = ii;
++ii;
changed |= runOnInstruction(M, i);
}
}
}
return changed;
}
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