74e4d55dcc
for range stmts now have split begin and ends, just apply OR to the condition. Should unbreak the build. llvm-svn: 263900
79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
//===--- ProBoundsArrayToPointerDecayCheck.cpp - clang-tidy----------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "ProBoundsArrayToPointerDecayCheck.h"
|
|
#include "clang/AST/ASTContext.h"
|
|
#include "clang/ASTMatchers/ASTMatchFinder.h"
|
|
|
|
using namespace clang::ast_matchers;
|
|
|
|
namespace clang {
|
|
namespace tidy {
|
|
|
|
AST_MATCHER_P(CXXForRangeStmt, hasRangeBeginEndStmt,
|
|
ast_matchers::internal::Matcher<DeclStmt>, InnerMatcher) {
|
|
for (const DeclStmt *Stmt : {Node.getBeginStmt(), Node.getEndStmt()})
|
|
if (Stmt != nullptr && InnerMatcher.matches(*Stmt, Finder, Builder))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
AST_MATCHER(Stmt, isInsideOfRangeBeginEndStmt) {
|
|
return stmt(hasAncestor(cxxForRangeStmt(
|
|
hasRangeBeginEndStmt(hasDescendant(equalsNode(&Node))))))
|
|
.matches(Node, Finder, Builder);
|
|
}
|
|
|
|
AST_MATCHER_P(Expr, hasParentIgnoringImpCasts,
|
|
ast_matchers::internal::Matcher<Expr>, InnerMatcher) {
|
|
const Expr *E = &Node;
|
|
do {
|
|
ASTContext::DynTypedNodeList Parents =
|
|
Finder->getASTContext().getParents(*E);
|
|
if (Parents.size() != 1)
|
|
return false;
|
|
E = Parents[0].get<Expr>();
|
|
if (!E)
|
|
return false;
|
|
} while (isa<ImplicitCastExpr>(E));
|
|
|
|
return InnerMatcher.matches(*E, Finder, Builder);
|
|
}
|
|
|
|
void ProBoundsArrayToPointerDecayCheck::registerMatchers(MatchFinder *Finder) {
|
|
if (!getLangOpts().CPlusPlus)
|
|
return;
|
|
|
|
// The only allowed array to pointer decay
|
|
// 1) just before array subscription
|
|
// 2) inside a range-for over an array
|
|
// 3) if it converts a string literal to a pointer
|
|
Finder->addMatcher(
|
|
implicitCastExpr(unless(hasParent(arraySubscriptExpr())),
|
|
unless(hasParentIgnoringImpCasts(explicitCastExpr())),
|
|
unless(isInsideOfRangeBeginEndStmt()),
|
|
unless(hasSourceExpression(stringLiteral())))
|
|
.bind("cast"),
|
|
this);
|
|
}
|
|
|
|
void ProBoundsArrayToPointerDecayCheck::check(
|
|
const MatchFinder::MatchResult &Result) {
|
|
const auto *MatchedCast = Result.Nodes.getNodeAs<ImplicitCastExpr>("cast");
|
|
if (MatchedCast->getCastKind() != CK_ArrayToPointerDecay)
|
|
return;
|
|
|
|
diag(MatchedCast->getExprLoc(), "do not implicitly decay an array into a "
|
|
"pointer; consider using gsl::array_view or "
|
|
"an explicit cast instead");
|
|
}
|
|
|
|
} // namespace tidy
|
|
} // namespace clang
|