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// Metaprogram's revision differentiator structure
// Copyright 2023 Nguyễn Gia Phong
//
// This file is distributed under the University of Illinois
// Open Source License. See LICENSE.TXT for details.
#ifndef KLEE_DIFFERENTIATOR_H
#define KLEE_DIFFERENTIATOR_H
#include "ExecutionState.h"
#include "klee/Expr/ArrayCache.h"
#include "klee/Expr/Expr.h"
#include "klee/Expr/ExprVisitor.h"
#include "klee/System/Time.h"
#include <cstdint>
#include <map>
#include <set>
#include <string>
namespace klee {
struct ExprCmbnVisitor : ExprVisitor {
ExprCmbnVisitor(char, ArrayCache&);
Action visitExprPost(const Expr& e) override;
/// Recorded output variables
std::map<std::string, std::map<ref<Expr>, ref<ReadExpr>>> outVars;
private:
char revision;
ArrayCache& arrayCache;
};
struct Differentiator {
/// Buffer of bytes
typedef std::vector<unsigned char> Bytes;
/// CLI arguments
typedef std::vector<Bytes> TestArgs;
/// :rev (:var val) stdout
typedef std::map<std::uint64_t,
std::pair<std::map<std::string, Bytes>,
Bytes>>
TestOuts;
typedef std::map<Bytes, std::set<std::uint64_t>> Clusters;
/// Extract revision number from given condition if any
static std::pair<bool, std::uint64_t> extractPatchNumber(ref<Expr> e);
Differentiator(std::unique_ptr<TimingSolver>*, time::Span&, ArrayCache&);
/// Extract differential test from concrete execution
void extract(ExecutionState*, ExecutionState*,
const std::vector<const Array*>&,
const std::vector<Bytes>&);
/// Compare with other exit states for possible differential tests
void search(ExecutionState*);
/// Log patch differentiation result
void log();
/// Program revision numbers
std::set<std::uint64_t> revisions;
private:
/// Program path for concrete execution.
const char* prog;
/// Exit states
std::map<std::uint64_t,
std::set<ExecutionState*,
ExecutionStatePathCondCompare>> exits;
/// Differential tests
std::map<TestArgs, TestOuts> tests;
/// SMT solver "borrowed" from Executor
std::unique_ptr<TimingSolver>* solver;
/// SMT solving timeout
time::Span solverTimeout;
/// Symbolic memory array
ArrayCache& arrayCache;
/// Symbolic output renamers
ExprCmbnVisitor visitorA, visitorB;
/// Differentiated pairs
std::map<std::pair<std::uint64_t, std::uint64_t>, TestOuts*> done;
};
} // namespace klee
#endif // KLEE_DIFFERENTIATOR_H
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