forked from OSchip/llvm-project
85 lines
2.9 KiB
C++
85 lines
2.9 KiB
C++
//===--- ProBoundsArrayToPointerDecayCheck.cpp - clang-tidy----------------===//
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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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#include "ProBoundsArrayToPointerDecayCheck.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/ParentMapContext.h"
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#include "clang/ASTMatchers/ASTMatchFinder.h"
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using namespace clang::ast_matchers;
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namespace clang {
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namespace tidy {
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namespace cppcoreguidelines {
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namespace {
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AST_MATCHER_P(CXXForRangeStmt, hasRangeBeginEndStmt,
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ast_matchers::internal::Matcher<DeclStmt>, InnerMatcher) {
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for (const DeclStmt *Stmt : {Node.getBeginStmt(), Node.getEndStmt()})
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if (Stmt != nullptr && InnerMatcher.matches(*Stmt, Finder, Builder))
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return true;
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return false;
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}
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AST_MATCHER(Stmt, isInsideOfRangeBeginEndStmt) {
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return stmt(hasAncestor(cxxForRangeStmt(
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hasRangeBeginEndStmt(hasDescendant(equalsNode(&Node))))))
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.matches(Node, Finder, Builder);
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}
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AST_MATCHER_P(Expr, hasParentIgnoringImpCasts,
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ast_matchers::internal::Matcher<Expr>, InnerMatcher) {
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const Expr *E = &Node;
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do {
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DynTypedNodeList Parents = Finder->getASTContext().getParents(*E);
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if (Parents.size() != 1)
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return false;
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E = Parents[0].get<Expr>();
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if (!E)
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return false;
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} while (isa<ImplicitCastExpr>(E));
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return InnerMatcher.matches(*E, Finder, Builder);
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}
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} // namespace
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void ProBoundsArrayToPointerDecayCheck::registerMatchers(MatchFinder *Finder) {
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// The only allowed array to pointer decay
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// 1) just before array subscription
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// 2) inside a range-for over an array
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// 3) if it converts a string literal to a pointer
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Finder->addMatcher(
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traverse(
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TK_AsIs,
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implicitCastExpr(
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unless(hasParent(arraySubscriptExpr())),
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unless(hasParentIgnoringImpCasts(explicitCastExpr())),
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unless(isInsideOfRangeBeginEndStmt()),
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unless(hasSourceExpression(ignoringParens(stringLiteral()))),
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unless(hasSourceExpression(ignoringParens(conditionalOperator(
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allOf(hasTrueExpression(stringLiteral()),
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hasFalseExpression(stringLiteral())))))))
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.bind("cast")),
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this);
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}
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void ProBoundsArrayToPointerDecayCheck::check(
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const MatchFinder::MatchResult &Result) {
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const auto *MatchedCast = Result.Nodes.getNodeAs<ImplicitCastExpr>("cast");
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if (MatchedCast->getCastKind() != CK_ArrayToPointerDecay)
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return;
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diag(MatchedCast->getExprLoc(), "do not implicitly decay an array into a "
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"pointer; consider using gsl::array_view or "
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"an explicit cast instead");
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}
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} // namespace cppcoreguidelines
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} // namespace tidy
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} // namespace clang
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