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This is part of the implementation of the dataflow analysis framework. See "[RFC] A dataflow analysis framework for Clang AST" on cfe-dev. Reviewed-by: xazax.hun Differential Revision: https://reviews.llvm.org/D116368
73 lines
2.0 KiB
C++
73 lines
2.0 KiB
C++
//===-- Transfer.cpp --------------------------------------------*- 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 transfer functions that evaluate program statements and
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// update an environment accordingly.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Analysis/FlowSensitive/Transfer.h"
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#include "clang/AST/Decl.h"
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#include "clang/AST/DeclBase.h"
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#include "clang/AST/Expr.h"
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#include "clang/AST/Stmt.h"
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#include "clang/AST/StmtVisitor.h"
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#include "clang/Analysis/FlowSensitive/DataflowEnvironment.h"
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#include "llvm/Support/Casting.h"
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#include <cassert>
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namespace clang {
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namespace dataflow {
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class TransferVisitor : public ConstStmtVisitor<TransferVisitor> {
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public:
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TransferVisitor(Environment &Env) : Env(Env) {}
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void VisitDeclStmt(const DeclStmt *S) {
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// FIXME: Add support for group decls, e.g: `int a, b;`
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if (S->isSingleDecl()) {
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if (const auto *D = dyn_cast<VarDecl>(S->getSingleDecl())) {
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visitVarDecl(*D);
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}
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}
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}
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// FIXME: Add support for:
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// - BinaryOperator
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// - CallExpr
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// - CXXBindTemporaryExpr
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// - CXXBoolLiteralExpr
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// - CXXConstructExpr
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// - CXXFunctionalCastExpr
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// - CXXOperatorCallExpr
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// - CXXStaticCastExpr
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// - CXXThisExpr
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// - DeclRefExpr
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// - ImplicitCastExpr
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// - MaterializeTemporaryExpr
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// - MemberExpr
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// - UnaryOperator
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private:
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void visitVarDecl(const VarDecl &D) {
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auto &Loc = Env.createStorageLocation(D);
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Env.setStorageLocation(D, Loc);
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Env.initValueInStorageLocation(Loc, D.getType());
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}
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Environment &Env;
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};
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void transfer(const Stmt &S, Environment &Env) {
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assert(!isa<ParenExpr>(&S));
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TransferVisitor(Env).Visit(&S);
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}
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} // namespace dataflow
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} // namespace clang
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