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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 "klee/Support/ErrorHandling.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/InlineAsm.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
#if LLVM_VERSION_CODE >= LLVM_VERSION(6, 0)
#include "llvm/CodeGen/TargetLowering.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/Target/TargetMachine.h"
#else
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetSubtargetInfo.h"
#endif
using namespace llvm;
using namespace klee;
char RaiseAsmPass::ID = 0;
Function *RaiseAsmPass::getIntrinsic(llvm::Module &M, unsigned IID, Type **Tys,
unsigned NumTys) {
return Intrinsic::getDeclaration(&M, (llvm::Intrinsic::ID) IID,
llvm::ArrayRef<llvm::Type*>(Tys, NumTys));
}
// FIXME: This should just be implemented as a patch to
// X86TargetAsmInfo.cpp, then everyone will benefit.
bool RaiseAsmPass::runOnInstruction(Module &M, Instruction *I) {
// We can just raise inline assembler using calls
CallInst *ci = dyn_cast<CallInst>(I);
if (!ci)
return false;
InlineAsm *ia = dyn_cast<InlineAsm>(ci->getCalledValue());
if (!ia)
return false;
// Try to use existing infrastructure
if (!TLI)
return false;
if (TLI->ExpandInlineAsm(ci))
return true;
if (triple.getArch() == llvm::Triple::x86_64 &&
(triple.getOS() == llvm::Triple::Linux ||
triple.getOS() == llvm::Triple::Darwin ||
triple.getOS() == llvm::Triple::FreeBSD)) {
if (ia->getAsmString() == "" && ia->hasSideEffects() &&
ia->getFunctionType()->getReturnType()->isVoidTy()) {
IRBuilder<> Builder(I);
#if LLVM_VERSION_CODE >= LLVM_VERSION(3, 9)
Builder.CreateFence(llvm::AtomicOrdering::SequentiallyConsistent);
#else
Builder.CreateFence(llvm::SequentiallyConsistent);
#endif
I->eraseFromParent();
return true;
}
}
return false;
}
bool RaiseAsmPass::runOnModule(Module &M) {
bool changed = false;
std::string Err;
std::string HostTriple = llvm::sys::getDefaultTargetTriple();
const Target *NativeTarget = TargetRegistry::lookupTarget(HostTriple, Err);
TargetMachine * TM = 0;
if (NativeTarget == 0) {
klee_warning("Warning: unable to select native target: %s", Err.c_str());
TLI = 0;
} else {
#if LLVM_VERSION_CODE >= LLVM_VERSION(3, 9)
TM = NativeTarget->createTargetMachine(HostTriple, "", "", TargetOptions(),
None);
TLI = TM->getSubtargetImpl(*(M.begin()))->getTargetLowering();
#else
TM = NativeTarget->createTargetMachine(HostTriple, "", "", TargetOptions());
TLI = TM->getSubtargetImpl(*(M.begin()))->getTargetLowering();
#endif
triple = llvm::Triple(HostTriple);
}
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);
}
}
}
delete TM;
return changed;
}
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