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//===-- TreeStream.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/ADT/TreeStream.h"
#include "klee/Internal/Support/Debug.h"
#include <cassert>
#include <iomanip>
#include <fstream>
#include <iterator>
#include <map>
#include "llvm/Support/raw_ostream.h"
#include <string.h>
using namespace klee;
///
TreeStreamWriter::TreeStreamWriter(const std::string &_path)
: lastID(0),
bufferCount(0),
path(_path),
output(new std::ofstream(path.c_str(),
std::ios::out | std::ios::binary)),
ids(1) {
if (!output->good()) {
delete output;
output = 0;
}
}
TreeStreamWriter::~TreeStreamWriter() {
flush();
if (output)
delete output;
}
bool TreeStreamWriter::good() {
return !!output;
}
TreeOStream TreeStreamWriter::open() {
return open(TreeOStream(*this, 0));
}
TreeOStream TreeStreamWriter::open(const TreeOStream &os) {
assert(output && os.writer==this);
flushBuffer();
unsigned id = ids++;
output->write(reinterpret_cast<const char*>(&os.id), 4);
unsigned tag = id | (1<<31);
output->write(reinterpret_cast<const char*>(&tag), 4);
return TreeOStream(*this, id);
}
void TreeStreamWriter::write(TreeOStream &os, const char *s, unsigned size) {
#if 1
if (bufferCount &&
(os.id!=lastID || size+bufferCount>bufferSize))
flushBuffer();
if (bufferCount) { // (os.id==lastID && size+bufferCount<=bufferSize)
memcpy(&buffer[bufferCount], s, size);
bufferCount += size;
} else if (size<bufferSize) {
lastID = os.id;
memcpy(buffer, s, size);
bufferCount = size;
} else {
output->write(reinterpret_cast<const char*>(&os.id), 4);
output->write(reinterpret_cast<const char*>(&size), 4);
output->write(buffer, size);
}
#else
output->write(reinterpret_cast<const char*>(&os.id), 4);
output->write(reinterpret_cast<const char*>(&size), 4);
output->write(s, size);
#endif
}
void TreeStreamWriter::flushBuffer() {
if (bufferCount) {
output->write(reinterpret_cast<const char*>(&lastID), 4);
output->write(reinterpret_cast<const char*>(&bufferCount), 4);
output->write(buffer, bufferCount);
bufferCount = 0;
}
}
void TreeStreamWriter::flush() {
flushBuffer();
output->flush();
}
void TreeStreamWriter::readStream(TreeStreamID streamID,
std::vector<unsigned char> &out) {
assert(streamID>0 && streamID<ids);
flush();
std::ifstream is(path.c_str(),
std::ios::in | std::ios::binary);
assert(is.good());
KLEE_DEBUG_WITH_TYPE("TreeStreamWriter",
llvm::errs() << "finding chain for: " << streamID << "\n");
std::map<unsigned,unsigned> parents;
std::vector<unsigned> roots;
for (;;) {
assert(is.good());
unsigned id;
unsigned tag;
is.read(reinterpret_cast<char*>(&id), 4);
is.read(reinterpret_cast<char*>(&tag), 4);
if (tag&(1<<31)) { // fork
unsigned child = tag ^ (1<<31);
if (child==streamID) {
roots.push_back(child);
while (id) {
roots.push_back(id);
std::map<unsigned, unsigned>::iterator it = parents.find(id);
assert(it!=parents.end());
id = it->second;
}
break;
} else {
parents.insert(std::make_pair(child,id));
}
} else {
unsigned size = tag;
while (size--) is.get();
}
}
KLEE_DEBUG({
llvm::errs() << "roots: ";
for (size_t i = 0, e = roots.size(); i < e; ++i) {
llvm::errs() << roots[i] << " ";
}
llvm::errs() << "\n";
});
is.seekg(0, std::ios::beg);
for (;;) {
unsigned id;
unsigned tag;
is.read(reinterpret_cast<char*>(&id), 4);
is.read(reinterpret_cast<char*>(&tag), 4);
if (!is.good()) break;
if (tag&(1<<31)) { // fork
unsigned child = tag ^ (1<<31);
if (id==roots.back() && roots.size()>1 && child==roots[roots.size()-2])
roots.pop_back();
} else {
unsigned size = tag;
if (id==roots.back()) {
while (size--) out.push_back(is.get());
} else {
while (size--) is.get();
}
}
}
}
///
TreeOStream::TreeOStream()
: writer(0),
id(0) {
}
TreeOStream::TreeOStream(TreeStreamWriter &_writer, unsigned _id)
: writer(&_writer),
id(_id) {
}
TreeOStream::~TreeOStream() {
}
unsigned TreeOStream::getID() const {
assert(writer);
return id;
}
void TreeOStream::write(const char *buffer, unsigned size) {
assert(writer);
writer->write(*this, buffer, size);
}
TreeOStream &TreeOStream::operator<<(const std::string &s) {
assert(writer);
write(s.c_str(), s.size());
return *this;
}
void TreeOStream::flush() {
assert(writer);
writer->flush();
}
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