| //===-- 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 |