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//===-- Transfer.h ----------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines a transfer function that evaluates a program statement and
// updates an environment accordingly.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_ANALYSIS_FLOWSENSITIVE_TRANSFER_H
#define LLVM_CLANG_ANALYSIS_FLOWSENSITIVE_TRANSFER_H
#include "clang/AST/Stmt.h"
#include "clang/Analysis/FlowSensitive/DataflowAnalysisContext.h"
#include "clang/Analysis/FlowSensitive/DataflowEnvironment.h"
#include "clang/Analysis/FlowSensitive/TypeErasedDataflowAnalysis.h"
namespace clang {
namespace dataflow {
/// Maps statements to the environments of basic blocks that contain them.
class StmtToEnvMap {
public:
// `CurBlockID` is the ID of the block currently being processed, and
// `CurState` is the pending state currently associated with this block. These
// are supplied separately as the pending state for the current block may not
// yet be represented in `BlockToState`.
StmtToEnvMap(const AdornedCFG &ACFG,
llvm::ArrayRef<std::optional<TypeErasedDataflowAnalysisState>>
BlockToState,
unsigned CurBlockID,
const TypeErasedDataflowAnalysisState &CurState)
: ACFG(ACFG), BlockToState(BlockToState), CurBlockID(CurBlockID),
CurState(CurState) {}
/// Returns the environment of the basic block that contains `S`.
/// The result is guaranteed never to be null.
const Environment *getEnvironment(const Stmt &S) const;
private:
const AdornedCFG &ACFG;
llvm::ArrayRef<std::optional<TypeErasedDataflowAnalysisState>> BlockToState;
unsigned CurBlockID;
const TypeErasedDataflowAnalysisState &CurState;
};
/// Evaluates `S` and updates `Env` accordingly.
///
/// Requirements:
///
/// `S` must not be `ParenExpr` or `ExprWithCleanups`.
void transfer(const StmtToEnvMap &StmtToEnv, const Stmt &S, Environment &Env,
Environment::ValueModel &Model);
} // namespace dataflow
} // namespace clang
#endif // LLVM_CLANG_ANALYSIS_FLOWSENSITIVE_TRANSFER_H
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