005daf1bc6
cast UseNullptr previously matched the implicit cast to const pointer as well as the explicit cast within that has an implicit cast to nullptr as a descendant. -Refactored UseNullptr to avoid special-casing certain kinds of cast sequences -Added test cases. llvm-svn: 178907
70 lines
2.0 KiB
C++
70 lines
2.0 KiB
C++
//===-- nullptr-convert/Matchers.cpp - Matchers for null casts ------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// \brief This file contains the definitions for matcher-generating functions
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/// and a custom AST_MATCHER for identifying casts of type CK_NullTo*.
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///
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//===----------------------------------------------------------------------===//
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#include "NullptrMatchers.h"
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#include "clang/AST/ASTContext.h"
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using namespace clang::ast_matchers;
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using namespace clang;
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const char *CastSequence = "sequence";
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namespace clang {
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namespace ast_matchers {
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/// \brief Matches cast expressions that have a cast kind of CK_NullToPointer
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/// or CK_NullToMemberPointer.
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///
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/// Given
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/// \code
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/// int *p = 0;
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/// \endcode
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/// implicitCastExpr(isNullToPointer()) matches the implicit cast clang adds
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/// around \c 0.
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AST_MATCHER(CastExpr, isNullToPointer) {
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return Node.getCastKind() == CK_NullToPointer ||
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Node.getCastKind() == CK_NullToMemberPointer;
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}
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AST_MATCHER(Type, sugaredNullptrType) {
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const Type *DesugaredType = Node.getUnqualifiedDesugaredType();
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if (const BuiltinType *BT = dyn_cast<BuiltinType>(DesugaredType))
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return BT->getKind() == BuiltinType::NullPtr;
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return false;
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}
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} // end namespace ast_matchers
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} // end namespace clang
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StatementMatcher makeCastSequenceMatcher() {
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StatementMatcher ImplicitCastToNull =
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implicitCastExpr(
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isNullToPointer(),
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unless(
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hasSourceExpression(
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hasType(sugaredNullptrType())
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)
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)
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);
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return castExpr(
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anyOf(
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ImplicitCastToNull,
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explicitCastExpr(
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hasDescendant(ImplicitCastToNull)
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)
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),
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unless(hasAncestor(explicitCastExpr()))
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).bind(CastSequence);
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}
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