6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
112 lines
4.0 KiB
C++
112 lines
4.0 KiB
C++
//===-- AdornedCFG.h ------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines an AdornedCFG class that is used by dataflow analyses that
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// run over Control-Flow Graphs (CFGs).
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_ANALYSIS_FLOWSENSITIVE_ADORNEDCFG_H
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#define LLVM_CLANG_ANALYSIS_FLOWSENSITIVE_ADORNEDCFG_H
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/Decl.h"
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#include "clang/AST/Stmt.h"
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#include "clang/Analysis/CFG.h"
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#include "clang/Analysis/FlowSensitive/ASTOps.h"
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#include "llvm/ADT/BitVector.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/Support/Error.h"
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#include <memory>
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#include <utility>
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namespace clang {
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namespace dataflow {
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namespace internal {
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class StmtToBlockMap {
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public:
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StmtToBlockMap(const CFG &Cfg);
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const CFGBlock *lookup(const Stmt &S) const {
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return StmtToBlock.lookup(&ignoreCFGOmittedNodes(S));
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}
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private:
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llvm::DenseMap<const Stmt *, const CFGBlock *> StmtToBlock;
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};
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} // namespace internal
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/// Holds CFG with additional information derived from it that is needed to
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/// perform dataflow analysis.
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class AdornedCFG {
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public:
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/// Builds an `AdornedCFG` from a `FunctionDecl`.
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/// `Func.doesThisDeclarationHaveABody()` must be true, and
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/// `Func.isTemplated()` must be false.
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static llvm::Expected<AdornedCFG> build(const FunctionDecl &Func);
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/// Builds an `AdornedCFG` from an AST node. `D` is the function in which
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/// `S` resides. `D.isTemplated()` must be false.
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static llvm::Expected<AdornedCFG> build(const Decl &D, Stmt &S,
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ASTContext &C);
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/// Returns the `Decl` containing the statement used to construct the CFG, if
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/// available.
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const Decl &getDecl() const { return ContainingDecl; }
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/// Returns the CFG that is stored in this context.
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const CFG &getCFG() const { return *Cfg; }
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/// Returns the basic block that contains `S`, or null if no basic block
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/// containing `S` is found.
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const CFGBlock *blockForStmt(const Stmt &S) const {
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return StmtToBlock.lookup(S);
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}
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/// Returns whether `B` is reachable from the entry block.
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bool isBlockReachable(const CFGBlock &B) const {
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return BlockReachable[B.getBlockID()];
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}
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/// Returns whether `B` contains an expression that is consumed in a
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/// different block than `B` (i.e. the parent of the expression is in a
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/// different block).
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/// This happens if there is control flow within a full-expression (triggered
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/// by `&&`, `||`, or the conditional operator). Note that the operands of
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/// these operators are not the only expressions that can be consumed in a
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/// different block. For example, in the function call
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/// `f(&i, cond() ? 1 : 0)`, `&i` is in a different block than the `CallExpr`.
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bool containsExprConsumedInDifferentBlock(const CFGBlock &B) const {
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return ContainsExprConsumedInDifferentBlock.contains(&B);
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}
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private:
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AdornedCFG(
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const Decl &D, std::unique_ptr<CFG> Cfg,
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internal::StmtToBlockMap StmtToBlock, llvm::BitVector BlockReachable,
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llvm::DenseSet<const CFGBlock *> ContainsExprConsumedInDifferentBlock)
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: ContainingDecl(D), Cfg(std::move(Cfg)),
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StmtToBlock(std::move(StmtToBlock)),
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BlockReachable(std::move(BlockReachable)),
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ContainsExprConsumedInDifferentBlock(
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std::move(ContainsExprConsumedInDifferentBlock)) {}
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/// The `Decl` containing the statement used to construct the CFG.
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const Decl &ContainingDecl;
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std::unique_ptr<CFG> Cfg;
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internal::StmtToBlockMap StmtToBlock;
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llvm::BitVector BlockReachable;
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llvm::DenseSet<const CFGBlock *> ContainsExprConsumedInDifferentBlock;
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};
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} // namespace dataflow
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} // namespace clang
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#endif // LLVM_CLANG_ANALYSIS_FLOWSENSITIVE_ADORNEDCFG_H
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