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//===-- ModuleUtil.cpp ----------------------------------------------------===//
//
// The KLEE Symbolic Virtual Machine
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "klee/Internal/Support/ModuleUtil.h"
#include "klee/Config/Version.h"
// FIXME: This does not belong here.
#include "../Core/Common.h"
#if LLVM_VERSION_CODE >= LLVM_VERSION(3, 3)
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IRReader/IRReader.h"
#include "llvm/IR/Module.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/DataStream.h"
#else
#include "llvm/Function.h"
#include "llvm/Instructions.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/Module.h"
#endif
#include "llvm/Linker.h"
#include "llvm/Assembly/AssemblyAnnotationWriter.h"
#include "llvm/Support/CFG.h"
#include "llvm/Support/CallSite.h"
#include "llvm/Support/InstIterator.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/Support/Path.h"
#include <map>
#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
using namespace llvm;
using namespace klee;
Module *klee::linkWithLibrary(Module *module,
const std::string &libraryName) {
#if LLVM_VERSION_CODE >= LLVM_VERSION(3, 3)
if (!sys::fs::exists(libraryName)) {
klee_error("Link with library %s failed. No such file.",
libraryName.c_str());
}
OwningPtr<MemoryBuffer> Buffer;
if (error_code ec = MemoryBuffer::getFile(libraryName,Buffer)) {
klee_error("Link with library %s failed: %s", libraryName.c_str(),
ec.message().c_str());
}
sys::fs::file_magic magic = sys::fs::identify_magic(Buffer->getBuffer());
LLVMContext &Context = getGlobalContext();
std::string ErrorMessage;
if (magic == sys::fs::file_magic::bitcode) {
Module *Result = 0;
Result = ParseBitcodeFile(Buffer.get(), Context, &ErrorMessage);
if (!Result || Linker::LinkModules(module, Result, Linker::DestroySource,
&ErrorMessage))
klee_error("Link with library %s failed: %s", libraryName.c_str(),
ErrorMessage.c_str());
delete Result;
} else if (magic == sys::fs::file_magic::archive) {
OwningPtr<object::Binary> arch;
if (error_code ec = object::createBinary(Buffer.take(), arch))
klee_error("Link with library %s failed: %s", libraryName.c_str(),
ec.message().c_str());
if (object::Archive *a = dyn_cast<object::Archive>(arch.get())) {
for (object::Archive::child_iterator i = a->begin_children(),
e = a->end_children(); i != e; ++i) {
OwningPtr<object::Binary> child;
if (i->getAsBinary(child)) {
// Try opening it as a bitcode file.
OwningPtr<MemoryBuffer> buff;
if (error_code ec = i->getMemoryBuffer(buff))
klee_error("Link with library %s failed: %s", libraryName.c_str(),
ec.message().c_str());
Module *Result = 0;
if (buff)
Result = ParseBitcodeFile(buff.get(), Context, &ErrorMessage);
if (!Result || Linker::LinkModules(module, Result,
Linker::DestroySource, &ErrorMessage))
klee_error("Link with library %s failed: %s", libraryName.c_str(),
ErrorMessage.c_str());
delete Result;
continue;
}
if (object::ObjectFile *o = dyn_cast<object::ObjectFile>(child.get())) {
klee_warning("Link with library: Object file %s in archive %s found. "
"Currently not supported.",
o->getFileName().data(), libraryName.c_str());
}
}
}
} else if (magic.is_object()) {
OwningPtr<object::Binary> obj;
if (object::ObjectFile *o = dyn_cast<object::ObjectFile>(obj.get())) {
klee_warning("Link with library: Object file %s in archive %s found. "
"Currently not supported.",
o->getFileName().data(), libraryName.c_str());
}
} else {
klee_error("Link with library %s failed: Unrecognized file type.",
libraryName.c_str());
}
return module;
#else
Linker linker("klee", module, false);
llvm::sys::Path libraryPath(libraryName);
bool native = false;
if (linker.LinkInFile(libraryPath, native)) {
klee_error("Linking library %s failed", libraryName.c_str());
}
return linker.releaseModule();
#endif
}
Function *klee::getDirectCallTarget(CallSite cs) {
Value *v = cs.getCalledValue();
if (Function *f = dyn_cast<Function>(v)) {
return f;
} else if (llvm::ConstantExpr *ce = dyn_cast<llvm::ConstantExpr>(v)) {
if (ce->getOpcode()==Instruction::BitCast)
if (Function *f = dyn_cast<Function>(ce->getOperand(0)))
return f;
// NOTE: This assert may fire, it isn't necessarily a problem and
// can be disabled, I just wanted to know when and if it happened.
assert(0 && "FIXME: Unresolved direct target for a constant expression.");
}
return 0;
}
static bool valueIsOnlyCalled(const Value *v) {
for (Value::const_use_iterator it = v->use_begin(), ie = v->use_end();
it != ie; ++it) {
if (const Instruction *instr = dyn_cast<Instruction>(*it)) {
if (instr->getOpcode()==0) continue; // XXX function numbering inst
if (!isa<CallInst>(instr) && !isa<InvokeInst>(instr)) return false;
// Make sure that the value is only the target of this call and
// not an argument.
for (unsigned i=1,e=instr->getNumOperands(); i!=e; ++i)
if (instr->getOperand(i)==v)
return false;
} else if (const llvm::ConstantExpr *ce =
dyn_cast<llvm::ConstantExpr>(*it)) {
if (ce->getOpcode()==Instruction::BitCast)
if (valueIsOnlyCalled(ce))
continue;
return false;
} else if (const GlobalAlias *ga = dyn_cast<GlobalAlias>(*it)) {
// XXX what about v is bitcast of aliasee?
if (v==ga->getAliasee() && !valueIsOnlyCalled(ga))
return false;
} else {
return false;
}
}
return true;
}
bool klee::functionEscapes(const Function *f) {
return !valueIsOnlyCalled(f);
}
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