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//===-- ExecutionTreeWriter.cpp -------------------------------------------===//
//
// The KLEE Symbolic Virtual Machine
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "ExecutionTreeWriter.h"
#include "ExecutionTree.h"
#include "klee/Support/ErrorHandling.h"
#include "klee/Support/OptionCategories.h"
#include "llvm/Support/CommandLine.h"
namespace {
llvm::cl::opt<unsigned> BatchSize(
"exec-tree-batch-size", llvm::cl::init(100U),
llvm::cl::desc("Number of execution tree nodes to batch for writing, "
"see --write-exec-tree (default=100)"),
llvm::cl::cat(klee::ExecTreeCat));
} // namespace
using namespace klee;
void prepare_statement(sqlite3 *db, const std::string &query, sqlite3_stmt **stmt) {
int result;
#ifdef SQLITE_PREPARE_PERSISTENT
result = sqlite3_prepare_v3(db, query.c_str(), -1, SQLITE_PREPARE_PERSISTENT,
stmt, nullptr);
#else
result = sqlite3_prepare_v3(db, query.c_str(), -1, 0, stmt, nullptr);
#endif
if (result != SQLITE_OK) {
klee_warning("Execution tree database: cannot prepare query: %s [%s]",
sqlite3_errmsg(db), query.c_str());
sqlite3_close(db);
klee_error("Execution tree database: cannot prepare query: %s",
query.c_str());
}
}
ExecutionTreeWriter::ExecutionTreeWriter(const std::string &dbPath) {
// create database file
if (sqlite3_open(dbPath.c_str(), &db) != SQLITE_OK)
klee_error("Cannot create execution tree database: %s", sqlite3_errmsg(db));
// - set options: asynchronous + WAL
char *errMsg = nullptr;
if (sqlite3_exec(db, "PRAGMA synchronous = OFF;", nullptr, nullptr,
&errMsg) != SQLITE_OK) {
klee_warning("Execution tree database: cannot set option: %s", errMsg);
sqlite3_free(errMsg);
}
if (sqlite3_exec(db, "PRAGMA journal_mode = WAL;", nullptr, nullptr,
&errMsg) != SQLITE_OK) {
klee_warning("Execution tree database: cannot set option: %s", errMsg);
sqlite3_free(errMsg);
}
// - create table
std::string query =
"CREATE TABLE IF NOT EXISTS nodes ("
"ID INT PRIMARY KEY, stateID INT, leftID INT, rightID INT,"
"asmLine INT, kind INT);";
char *zErr = nullptr;
if (sqlite3_exec(db, query.c_str(), nullptr, nullptr, &zErr) != SQLITE_OK) {
klee_warning("Execution tree database: initialisation error: %s", zErr);
sqlite3_free(zErr);
sqlite3_close(db);
klee_error("Execution tree database: initialisation error.");
}
// create prepared statements
// - insertStmt
query = "INSERT INTO nodes VALUES (?, ?, ?, ?, ?, ?);";
prepare_statement(db, query, &insertStmt);
// - transactionBeginStmt
query = "BEGIN TRANSACTION";
prepare_statement(db, query, &transactionBeginStmt);
// - transactionCommitStmt
query = "COMMIT TRANSACTION";
prepare_statement(db, query, &transactionCommitStmt);
// begin transaction
if (sqlite3_step(transactionBeginStmt) != SQLITE_DONE) {
klee_warning("Execution tree database: cannot begin transaction: %s",
sqlite3_errmsg(db));
}
if (sqlite3_reset(transactionBeginStmt) != SQLITE_OK) {
klee_warning("Execution tree database: cannot reset transaction: %s",
sqlite3_errmsg(db));
}
}
ExecutionTreeWriter::~ExecutionTreeWriter() {
batchCommit(!flushed);
// finalize prepared statements
sqlite3_finalize(insertStmt);
sqlite3_finalize(transactionBeginStmt);
sqlite3_finalize(transactionCommitStmt);
// commit
if (sqlite3_exec(db, "END TRANSACTION", nullptr, nullptr, nullptr) !=
SQLITE_OK) {
klee_warning("Execution tree database: cannot end transaction: %s",
sqlite3_errmsg(db));
}
if (sqlite3_close(db) != SQLITE_OK) {
klee_warning("Execution tree database: cannot close database: %s",
sqlite3_errmsg(db));
}
}
void ExecutionTreeWriter::batchCommit(bool force) {
++batch;
if (batch < BatchSize && !force)
return;
// commit and begin transaction
if (sqlite3_step(transactionCommitStmt) != SQLITE_DONE) {
klee_warning("Execution tree database: transaction commit error: %s",
sqlite3_errmsg(db));
}
if (sqlite3_reset(transactionCommitStmt) != SQLITE_OK) {
klee_warning("Execution tree database: transaction reset error: %s",
sqlite3_errmsg(db));
}
if (sqlite3_step(transactionBeginStmt) != SQLITE_DONE) {
klee_warning("Execution tree database: transaction begin error: %s",
sqlite3_errmsg(db));
}
if (sqlite3_reset(transactionBeginStmt) != SQLITE_OK) {
klee_warning("Execution tree database: transaction reset error: %s",
sqlite3_errmsg(db));
}
batch = 0;
flushed = true;
}
void ExecutionTreeWriter::write(const AnnotatedExecutionTreeNode &node) {
unsigned rc = 0;
// bind values (SQLITE_OK is defined as 0 - just check success once at the
// end)
rc |= sqlite3_bind_int64(insertStmt, 1, node.id);
rc |= sqlite3_bind_int(insertStmt, 2, node.stateID);
rc |= sqlite3_bind_int64(
insertStmt, 3,
node.left.getPointer()
? (static_cast<AnnotatedExecutionTreeNode *>(node.left.getPointer()))->id
: 0);
rc |= sqlite3_bind_int64(
insertStmt, 4,
node.right.getPointer()
? (static_cast<AnnotatedExecutionTreeNode *>(node.right.getPointer()))->id
: 0);
rc |= sqlite3_bind_int(insertStmt, 5, node.asmLine);
std::uint8_t value{0};
if (std::holds_alternative<BranchType>(node.kind)) {
value = static_cast<std::uint8_t>(std::get<BranchType>(node.kind));
} else if (std::holds_alternative<StateTerminationType>(node.kind)) {
value =
static_cast<std::uint8_t>(std::get<StateTerminationType>(node.kind));
} else {
assert(false && "ExecutionTreeWriter: Illegal node kind!");
}
rc |= sqlite3_bind_int(insertStmt, 6, value);
if (rc != SQLITE_OK) {
// This is either a programming error (e.g. SQLITE_MISUSE) or we ran out of
// resources (e.g. SQLITE_NOMEM). Calling sqlite3_errmsg() after a possible
// successful call above is undefined, hence no error message here.
klee_error("Execution tree database: cannot persist data for node: %u",
node.id);
}
// insert
if (sqlite3_step(insertStmt) != SQLITE_DONE) {
klee_warning(
"Execution tree database: cannot persist data for node: %u: %s",
node.id, sqlite3_errmsg(db));
}
if (sqlite3_reset(insertStmt) != SQLITE_OK) {
klee_warning("Execution tree database: error reset node: %u: %s", node.id,
sqlite3_errmsg(db));
}
batchCommit();
}
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