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//===-- InstructionInfoTable.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/Module/InstructionInfoTable.h"
#include "klee/Config/Version.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Module.h"
# if LLVM_VERSION_CODE < LLVM_VERSION(3,5)
#include "llvm/Assembly/AssemblyAnnotationWriter.h"
#include "llvm/Support/InstIterator.h"
#include "llvm/Linker.h"
#else
#include "llvm/IR/AssemblyAnnotationWriter.h"
#include "llvm/IR/InstIterator.h"
#include "llvm/Linker/Linker.h"
#endif
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/raw_ostream.h"
#if LLVM_VERSION_CODE >= LLVM_VERSION(3,5)
#include "llvm/IR/DebugInfo.h"
#else
#include "llvm/DebugInfo.h"
#endif
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/Support/ErrorHandling.h"
#include <map>
#include <string>
using namespace llvm;
using namespace klee;
class InstructionToLineAnnotator : public llvm::AssemblyAnnotationWriter {
public:
void emitInstructionAnnot(const Instruction *i,
llvm::formatted_raw_ostream &os) {
os << "%%%";
os << (uintptr_t) i;
}
};
static void buildInstructionToLineMap(Module *m,
std::map<const Instruction*, unsigned> &out) {
InstructionToLineAnnotator a;
std::string str;
llvm::raw_string_ostream os(str);
m->print(os, &a);
os.flush();
const char *s;
unsigned line = 1;
for (s=str.c_str(); *s; s++) {
if (*s=='\n') {
line++;
if (s[1]=='%' && s[2]=='%' && s[3]=='%') {
s += 4;
char *end;
unsigned long long value = strtoull(s, &end, 10);
if (end!=s) {
out.insert(std::make_pair((const Instruction*) value, line));
}
s = end;
}
}
}
}
static std::string getDSPIPath(const DILocation &Loc) {
std::string dir = Loc.getDirectory();
std::string file = Loc.getFilename();
if (dir.empty() || file[0] == '/') {
return file;
} else if (*dir.rbegin() == '/') {
return dir + file;
} else {
return dir + "/" + file;
}
}
bool InstructionInfoTable::getInstructionDebugInfo(const llvm::Instruction *I,
const std::string *&File,
unsigned &Line) {
if (MDNode *N = I->getMetadata("dbg")) {
#if LLVM_VERSION_CODE >= LLVM_VERSION(3, 7)
DILocation *Loc = cast<DILocation>(N);
File = internString(getDSPIPath(*Loc));
Line = Loc->getLine();
#else
DILocation Loc(N);
File = internString(getDSPIPath(Loc));
Line = Loc.getLineNumber();
#endif
return true;
}
return false;
}
InstructionInfoTable::InstructionInfoTable(Module *m)
: dummyString(""), dummyInfo(0, dummyString, 0, 0) {
unsigned id = 0;
std::map<const Instruction*, unsigned> lineTable;
buildInstructionToLineMap(m, lineTable);
for (Module::iterator fnIt = m->begin(), fn_ie = m->end();
fnIt != fn_ie; ++fnIt) {
Function *fn = &*fnIt;
// We want to ensure that as all instructions have source information, if
// available. Clang sometimes will not write out debug information on the
// initial instructions in a function (correspond to the formal parameters),
// so we first search forward to find the first instruction with debug info,
// if any.
const std::string *initialFile = &dummyString;
unsigned initialLine = 0;
for (inst_iterator it = inst_begin(fn), ie = inst_end(fn); it != ie; ++it) {
if (getInstructionDebugInfo(&*it, initialFile, initialLine))
break;
}
const std::string *file = initialFile;
unsigned line = initialLine;
for (inst_iterator it = inst_begin(fn), ie = inst_end(fn); it != ie;
++it) {
Instruction *instr = &*it;
unsigned assemblyLine = lineTable[instr];
// Update our source level debug information.
getInstructionDebugInfo(instr, file, line);
infos.insert(std::make_pair(instr,
InstructionInfo(id++, *file, line,
assemblyLine)));
}
}
}
InstructionInfoTable::~InstructionInfoTable() {
for (std::set<const std::string *, ltstr>::iterator
it = internedStrings.begin(), ie = internedStrings.end();
it != ie; ++it)
delete *it;
}
const std::string *InstructionInfoTable::internString(std::string s) {
std::set<const std::string *, ltstr>::iterator it = internedStrings.find(&s);
if (it==internedStrings.end()) {
std::string *interned = new std::string(s);
internedStrings.insert(interned);
return interned;
} else {
return *it;
}
}
unsigned InstructionInfoTable::getMaxID() const {
return infos.size();
}
const InstructionInfo &
InstructionInfoTable::getInfo(const Instruction *inst) const {
std::map<const llvm::Instruction*, InstructionInfo>::const_iterator it =
infos.find(inst);
if (it == infos.end())
llvm::report_fatal_error("invalid instruction, not present in "
"initial module!");
return it->second;
}
const InstructionInfo &
InstructionInfoTable::getFunctionInfo(const Function *f) const {
if (f->isDeclaration()) {
// FIXME: We should probably eliminate this dummyInfo object, and instead
// allocate a per-function object to track the stats for that function
// (otherwise, anyone actually trying to use those stats is getting ones
// shared across all functions). I'd like to see if this matters in practice
// and construct a test case for it if it does, though.
return dummyInfo;
} else {
return getInfo(&*(f->begin()->begin()));
}
}
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