d44621c7a7
...in
<b9d678d22f>
"[Clang] Use TargetInfo when deciding if an address space is compatible
(#115777)"
Change-Id: Ibe9e4882057edbdcdbd286416c3d317c292b2298
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/176760
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <stephan.bergmann@allotropia.de>
1025 lines
39 KiB
C++
1025 lines
39 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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// Warn about certain redundant casts:
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//
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// * A reinterpret_cast<T*>(...) whose result is then implicitly cast to a void
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// pointer
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//
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// * A static_cast<T*>(e) where e is of void pointer type and whose result is
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// then implicitly cast to a void pointer
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//
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// * Various const_casts that are either not needed (like casting away constness
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// in a delete expression) or are implicitly cast back afterwards
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//
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// C-style casts are ignored because it makes this plugin simpler, and they
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// should eventually be eliminated via loplugin:cstylecast and/or
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// -Wold-style-cast. That implies that this plugin is only relevant for C++
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// code.
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#include "clang/Sema/Sema.h"
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#include "check.hxx"
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#include "compat.hxx"
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#include "plugin.hxx"
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#include <iostream>
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namespace {
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bool isVoidPointer(QualType type) {
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return type->isPointerType()
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&& type->getAs<clang::PointerType>()->getPointeeType()->isVoidType();
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}
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bool isRedundantConstCast(CXXConstCastExpr const * expr) {
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auto const sub = compat::getSubExprAsWritten(expr);
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return
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(expr->getType().getCanonicalType()
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== sub->getType().getCanonicalType())
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&& (expr->getValueKind() != VK_XValue
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|| sub->getValueKind() == VK_XValue);
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}
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bool canConstCastFromTo(Expr const * from, Expr const * to) {
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auto const k1 = from->getValueKind();
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auto const k2 = to->getValueKind();
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return (k2 == VK_LValue && k1 == VK_LValue)
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|| (k2 == VK_XValue
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&& (k1 != compat::VK_PRValue || from->getType()->isRecordType()));
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}
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char const * printExprValueKind(ExprValueKind k) {
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switch (k) {
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case compat::VK_PRValue:
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return "prvalue";
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case VK_LValue:
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return "lvalue";
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case VK_XValue:
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return "xvalue";
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};
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llvm_unreachable("unknown ExprValueKind");
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}
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QualType desugarElaboratedType(QualType type) {
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if (auto const t = dyn_cast<ElaboratedType>(type)) {
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return t->desugar();
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}
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return type;
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}
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enum class AlgebraicType { None, Integer, FloatingPoint };
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AlgebraicType algebraicType(clang::Type const & type) {
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if (type.isIntegralOrEnumerationType()) {
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return AlgebraicType::Integer;
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} else if (type.isRealFloatingType()) {
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return AlgebraicType::FloatingPoint;
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} else {
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return AlgebraicType::None;
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}
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}
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// Do not look through FunctionToPointerDecay, but through e.g. NullToPointer:
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Expr const * stopAtFunctionPointerDecay(ExplicitCastExpr const * expr) {
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auto const e1 = expr->getSubExpr();
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if (auto const e2 = dyn_cast<ImplicitCastExpr>(e1)) {
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if (e2->getCastKind() != CK_FunctionToPointerDecay) {
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return e2->getSubExpr();
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}
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}
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return e1;
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}
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class RedundantCast:
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public loplugin::FilteringRewritePlugin<RedundantCast>
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{
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public:
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explicit RedundantCast(loplugin::InstantiationData const & data):
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FilteringRewritePlugin(data)
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{}
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virtual void run() override {
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if (compiler.getLangOpts().CPlusPlus) {
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TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
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}
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}
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bool TraverseInitListExpr(InitListExpr * expr, DataRecursionQueue * queue = nullptr) {
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return WalkUpFromInitListExpr(expr)
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&& TraverseSynOrSemInitListExpr(
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expr->isSemanticForm() ? expr : expr->getSemanticForm(), queue);
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}
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bool TraverseReturnStmt(ReturnStmt * stmt) {
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auto const saved = returnExpr_;
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returnExpr_ = stmt->getRetValue();
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auto const ret = FilteringRewritePlugin::TraverseReturnStmt(stmt);
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returnExpr_ = saved;
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return ret;
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}
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bool VisitImplicitCastExpr(ImplicitCastExpr const * expr);
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bool VisitCXXStaticCastExpr(CXXStaticCastExpr const * expr);
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bool VisitCXXReinterpretCastExpr(CXXReinterpretCastExpr const * expr);
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bool VisitCXXConstCastExpr(CXXConstCastExpr const * expr);
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bool VisitCXXFunctionalCastExpr(CXXFunctionalCastExpr const * expr);
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bool VisitCXXDynamicCastExpr(CXXDynamicCastExpr const * expr);
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bool VisitCallExpr(CallExpr const * expr);
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bool VisitCXXDeleteExpr(CXXDeleteExpr const * expr);
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bool VisitCStyleCastExpr(CStyleCastExpr const * expr);
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bool VisitBinaryOperator(BinaryOperator const * expr) {
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auto const op = expr->getOpcode();
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if (op == BO_Sub || expr->isRelationalOp() || expr->isEqualityOp()) {
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return visitBinOp(expr);
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}
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if (op == BO_Assign) {
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if (ignoreLocation(expr)) {
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return true;
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}
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visitAssign(expr->getLHS()->getType(), expr->getRHS());
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return true;
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}
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return true;
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}
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bool VisitVarDecl(VarDecl const * varDecl);
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private:
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bool visitBinOp(BinaryOperator const * expr);
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void visitAssign(QualType lhs, Expr const * rhs);
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bool isOverloadedFunction(FunctionDecl const * decl);
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bool isInIgnoredMacroBody(Expr const * expr) {
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auto const loc = expr->getBeginLoc();
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return compiler.getSourceManager().isMacroBodyExpansion(loc)
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&& ignoreLocation(compiler.getSourceManager().getSpellingLoc(loc));
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}
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Expr const * returnExpr_ = nullptr;
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};
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bool RedundantCast::VisitImplicitCastExpr(const ImplicitCastExpr * expr) {
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if (ignoreLocation(expr)) {
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return true;
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}
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switch (expr->getCastKind()) {
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case CK_NoOp:
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if (expr->getType()->isPointerType()
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|| expr->getType()->isObjectType())
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{
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auto e = dyn_cast<CXXConstCastExpr>(
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expr->getSubExpr()->IgnoreParenImpCasts());
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if (e != nullptr && !isRedundantConstCast(e)) {
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auto t1 = e->getSubExpr()->getType().getCanonicalType();
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auto t3 = expr->getType().getCanonicalType();
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bool ObjCLifetimeConversion;
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if (t1.getTypePtr() == t3.getTypePtr()
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|| (compiler.getSema().IsQualificationConversion(
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t1, t3, false, ObjCLifetimeConversion)
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&& (e->getType().getCanonicalType().getTypePtr()
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!= t3.getTypePtr())))
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{
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report(
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DiagnosticsEngine::Warning,
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("redundant const_cast from %0 to %1, result is"
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" implicitly cast to %2"),
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e->getExprLoc())
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<< e->getSubExprAsWritten()->getType() << e->getType()
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<< expr->getType() << expr->getSourceRange();
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}
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}
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}
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break;
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case CK_BitCast:
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if (isVoidPointer(expr->getType())
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&& expr->getSubExpr()->getType()->isPointerType())
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{
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Expr const * e = expr->getSubExpr()->IgnoreParenImpCasts();
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while (isa<CXXConstCastExpr>(e)) {
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auto cc = dyn_cast<CXXConstCastExpr>(e);
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if (compat::isAtLeastAsQualifiedAs(
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expr->getType()->getAs<clang::PointerType>()->getPointeeType(),
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cc->getSubExpr()->getType()->getAs<clang::PointerType>()->getPointeeType(),
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compiler.getASTContext()))
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{
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report(
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DiagnosticsEngine::Warning,
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("redundant const_cast from %0 to %1, result is"
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" ultimately implicitly cast to %2"),
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cc->getExprLoc())
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<< cc->getSubExprAsWritten()->getType() << cc->getType()
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<< expr->getType() << expr->getSourceRange();
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}
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e = cc->getSubExpr()->IgnoreParenImpCasts();
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}
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if (isa<CXXReinterpretCastExpr>(e)) {
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report(
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DiagnosticsEngine::Warning,
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("redundant reinterpret_cast, result is implicitly cast to"
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" void pointer"),
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e->getExprLoc())
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<< e->getSourceRange();
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} else if (isa<CXXStaticCastExpr>(e)
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&& isVoidPointer(
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dyn_cast<CXXStaticCastExpr>(e)->getSubExpr()
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->IgnoreParenImpCasts()->getType())
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&& !compiler.getSourceManager().isMacroBodyExpansion(
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e->getBeginLoc()))
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{
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report(
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DiagnosticsEngine::Warning,
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("redundant static_cast from void pointer, result is"
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" implicitly cast to void pointer"),
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e->getExprLoc())
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<< e->getSourceRange();
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}
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}
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break;
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case CK_DerivedToBase:
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case CK_UncheckedDerivedToBase:
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if (expr->getType()->isPointerType()) {
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Expr const * e = expr->getSubExpr()->IgnoreParenImpCasts();
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while (isa<CXXConstCastExpr>(e)) {
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auto cc = dyn_cast<CXXConstCastExpr>(e);
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if (compat::isAtLeastAsQualifiedAs(
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expr->getType()->getAs<clang::PointerType>()->getPointeeType(),
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cc->getSubExpr()->getType()->getAs<clang::PointerType>()->getPointeeType(),
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compiler.getASTContext()))
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{
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report(
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DiagnosticsEngine::Warning,
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("redundant const_cast from %0 to %1, result is"
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" ultimately implicitly cast to %2"),
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cc->getExprLoc())
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<< cc->getSubExprAsWritten()->getType() << cc->getType()
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<< expr->getType() << expr->getSourceRange();
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}
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e = cc->getSubExpr()->IgnoreParenImpCasts();
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}
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} else if (expr->getType()->isReferenceType()) {
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Expr const * e = expr->getSubExpr()->IgnoreParenImpCasts();
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while (isa<CXXConstCastExpr>(e)) {
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auto cc = dyn_cast<CXXConstCastExpr>(e);
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if (compat::isAtLeastAsQualifiedAs(
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expr->getType()->getAs<ReferenceType>()->getPointeeType(),
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cc->getSubExpr()->getType()->getAs<ReferenceType>()->getPointeeType(),
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compiler.getASTContext()))
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{
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report(
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DiagnosticsEngine::Warning,
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("redundant const_cast from %0 to %1, result is"
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" ultimately implicitly cast to %2"),
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cc->getExprLoc())
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<< cc->getSubExprAsWritten()->getType() << cc->getType()
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<< expr->getType() << expr->getSourceRange();
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}
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e = cc->getSubExpr()->IgnoreParenImpCasts();
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}
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}
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break;
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case CK_FloatingToIntegral:
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case CK_IntegralToFloating:
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if (auto e = dyn_cast<ExplicitCastExpr>(expr->getSubExpr()->IgnoreParenImpCasts())) {
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if ((isa<CXXStaticCastExpr>(e) || isa<CXXFunctionalCastExpr>(e))
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&& (algebraicType(*e->getSubExprAsWritten()->getType())
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== algebraicType(*expr->getType())))
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{
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report(
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DiagnosticsEngine::Warning,
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("suspicious %select{static_cast|functional cast}0 from %1 to %2, result is"
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" implicitly cast to %3"),
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e->getExprLoc())
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<< isa<CXXFunctionalCastExpr>(e) << e->getSubExprAsWritten()->getType()
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<< e->getTypeAsWritten() << expr->getType() << expr->getSourceRange();
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}
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}
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break;
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default:
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break;
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}
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return true;
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}
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bool RedundantCast::VisitCStyleCastExpr(CStyleCastExpr const * expr) {
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if (ignoreLocation(expr)) {
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return true;
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}
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if (isInUnoIncludeFile(compiler.getSourceManager().getSpellingLoc(expr->getBeginLoc()))) {
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return true;
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}
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auto t1 = compat::getSubExprAsWritten(expr)->getType();
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auto t2 = expr->getTypeAsWritten();
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if (auto templateType = dyn_cast<SubstTemplateTypeParmType>(t1)) {
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t1 = templateType->desugar();
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}
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if (desugarElaboratedType(t1) != desugarElaboratedType(t2)) {
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return true;
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}
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if (!t1->isBuiltinType() && !loplugin::TypeCheck(t1).Enum() && !loplugin::TypeCheck(t1).Typedef()) {
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return true;
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}
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if (!loplugin::isOkToRemoveArithmeticCast(compiler.getASTContext(), t1, t2, expr->getSubExpr()))
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{
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return true;
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}
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// Ignore FD_ISSET expanding to "...(SOCKET)(fd)..." in some Microsoft
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|
// winsock2.h (TODO: improve heuristic of determining that the whole
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// expr is part of a single macro body expansion):
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auto l1 = expr->getBeginLoc();
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while (compiler.getSourceManager().isMacroArgExpansion(l1)) {
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l1 = compiler.getSourceManager().getImmediateMacroCallerLoc(l1);
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}
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auto l2 = expr->getExprLoc();
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while (compiler.getSourceManager().isMacroArgExpansion(l2)) {
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l2 = compiler.getSourceManager().getImmediateMacroCallerLoc(l2);
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}
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auto l3 = expr->getEndLoc();
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while (compiler.getSourceManager().isMacroArgExpansion(l3)) {
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l3 = compiler.getSourceManager().getImmediateMacroCallerLoc(l3);
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}
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if (compiler.getSourceManager().isMacroBodyExpansion(l1)
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&& compiler.getSourceManager().isMacroBodyExpansion(l2)
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&& compiler.getSourceManager().isMacroBodyExpansion(l3)
|
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&& ignoreLocation(compiler.getSourceManager().getSpellingLoc(l2)))
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{
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return true;
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}
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report(
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DiagnosticsEngine::Warning,
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"redundant cstyle cast from %0 to %1", expr->getExprLoc())
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<< t1 << t2 << expr->getSourceRange();
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return true;
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}
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bool RedundantCast::VisitVarDecl(VarDecl const * varDecl) {
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if (ignoreLocation(varDecl)) {
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return true;
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}
|
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if (!varDecl->getInit())
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return true;
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visitAssign(varDecl->getType(), varDecl->getInit());
|
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if (varDecl->getInitStyle() != VarDecl::CInit
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&& isa<CXXTemporaryObjectExpr>(varDecl->getInit())
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&& !compiler.getSourceManager().isMacroBodyExpansion(varDecl->getInit()->getBeginLoc()))
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|
{
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report(
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DiagnosticsEngine::Warning, "redundant functional cast",
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varDecl->getBeginLoc())
|
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<< varDecl->getSourceRange();
|
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}
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return true;
|
|
}
|
|
|
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void RedundantCast::visitAssign(QualType t1, Expr const * rhs)
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|
{
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auto staticCastExpr = dyn_cast<CXXStaticCastExpr>(rhs->IgnoreImplicit());
|
|
if (!staticCastExpr)
|
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return;
|
|
|
|
auto const t2 = staticCastExpr->getSubExpr()->IgnoreImplicit()->getType();
|
|
|
|
// if there is more than one copy of the LHS, this cast is resolving ambiguity
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bool foundOne = false;
|
|
if (t1->isRecordType())
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|
{
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foundOne = loplugin::derivedFromCount(t2, t1) == 1;
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|
}
|
|
else
|
|
{
|
|
auto pointee1 = t1->getPointeeCXXRecordDecl();
|
|
auto pointee2 = t2->getPointeeCXXRecordDecl();
|
|
if (pointee1 && pointee2)
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|
foundOne = loplugin::derivedFromCount(pointee2, pointee1) == 1;
|
|
}
|
|
|
|
if (foundOne)
|
|
{
|
|
report(
|
|
DiagnosticsEngine::Warning, "redundant static_cast from %0 to %1",
|
|
staticCastExpr->getExprLoc())
|
|
<< t2 << t1 << staticCastExpr->getSourceRange();
|
|
}
|
|
}
|
|
|
|
bool RedundantCast::VisitCXXStaticCastExpr(CXXStaticCastExpr const * expr) {
|
|
if (ignoreLocation(expr)) {
|
|
return true;
|
|
}
|
|
auto const t2 = expr->getTypeAsWritten();
|
|
bool const fnptr = t2->isFunctionPointerType() || t2->isMemberFunctionPointerType();
|
|
auto const sub = fnptr ? stopAtFunctionPointerDecay(expr) : compat::getSubExprAsWritten(expr);
|
|
auto const t1 = sub->getType();
|
|
auto const nonClassObjectType = t2->isObjectType()
|
|
&& !(t2->isRecordType() || t2->isArrayType());
|
|
if (nonClassObjectType && t2.hasLocalQualifiers()) {
|
|
report(
|
|
DiagnosticsEngine::Warning,
|
|
("in static_cast from %0 %1 to %2 %3, remove redundant top-level"
|
|
" %select{const qualifier|volatile qualifier|const volatile"
|
|
" qualifiers}4"),
|
|
expr->getExprLoc())
|
|
<< t1 << printExprValueKind(sub->getValueKind())
|
|
<< t2 << printExprValueKind(expr->getValueKind())
|
|
<< ((t2.isLocalConstQualified() ? 1 : 0)
|
|
+ (t2.isLocalVolatileQualified() ? 2 : 0) - 1)
|
|
<< expr->getSourceRange();
|
|
return true;
|
|
}
|
|
if (auto const impl = dyn_cast<ImplicitCastExpr>(expr->getSubExpr())) {
|
|
if (impl->getCastKind() == CK_ArrayToPointerDecay && impl->getType() == t2)
|
|
//TODO: instead of exact QualType match, allow some variation?
|
|
{
|
|
auto const fn = handler.getMainFileName();
|
|
if (!(loplugin::isSamePathname(
|
|
fn, SRCDIR "/sal/qa/rtl/strings/test_ostring_concat.cxx")
|
|
|| loplugin::isSamePathname(
|
|
fn, SRCDIR "/sal/qa/rtl/strings/test_ostring_stringliterals.cxx")
|
|
|| loplugin::isSamePathname(
|
|
fn, SRCDIR "/sal/qa/rtl/strings/test_oustring_concat.cxx")
|
|
|| loplugin::isSamePathname(
|
|
fn, SRCDIR "/sal/qa/rtl/strings/test_oustring_stringliterals.cxx")
|
|
|| isInIgnoredMacroBody(expr)))
|
|
{
|
|
report(
|
|
DiagnosticsEngine::Warning, "redundant static_cast from %0 to %1",
|
|
expr->getExprLoc())
|
|
<< expr->getSubExprAsWritten()->getType() << t2 << expr->getSourceRange();
|
|
}
|
|
return true;
|
|
}
|
|
}
|
|
auto const t3 = expr->getType();
|
|
auto const c1 = t1.getCanonicalType();
|
|
auto const c3 = t3.getCanonicalType();
|
|
if (nonClassObjectType || !canConstCastFromTo(sub, expr)
|
|
? c1.getTypePtr() != c3.getTypePtr() : c1 != c3)
|
|
{
|
|
bool ObjCLifetimeConversion;
|
|
if (nonClassObjectType
|
|
|| (c1.getTypePtr() != c3.getTypePtr()
|
|
&& !compiler.getSema().IsQualificationConversion(
|
|
c1, c3, false, ObjCLifetimeConversion)))
|
|
{
|
|
return true;
|
|
}
|
|
report(
|
|
DiagnosticsEngine::Warning,
|
|
"static_cast from %0 %1 to %2 %3 should be written as const_cast",
|
|
expr->getExprLoc())
|
|
<< t1 << printExprValueKind(sub->getValueKind())
|
|
<< t2 << printExprValueKind(expr->getValueKind())
|
|
<< expr->getSourceRange();
|
|
return true;
|
|
}
|
|
if (!loplugin::isOkToRemoveArithmeticCast(compiler.getASTContext(), t1, t2, expr->getSubExpr()))
|
|
{
|
|
return true;
|
|
}
|
|
// Don't warn if the types are 'void *' and at least one involves a typedef
|
|
// (and if both involve typedefs, they're different) (this covers cases like
|
|
// 'oslModule', or 'CURL *', or casts between 'LPVOID' and 'HANDLE' in
|
|
// Windows-only code):
|
|
if (loplugin::TypeCheck(t1).Pointer().NonConstVolatile().Void()) {
|
|
if (auto const td1 = t1->getAs<TypedefType>()) {
|
|
auto const td2 = t2->getAs<TypedefType>();
|
|
if (td2 == nullptr || td2 != td1) {
|
|
return true;
|
|
}
|
|
} else if (auto const td2 = t2->getAs<TypedefType>()) {
|
|
auto const td1 = t1->getAs<TypedefType>();
|
|
if (td1 == nullptr || td1 != td2) {
|
|
return true;
|
|
}
|
|
} else {
|
|
auto const pt1 = t1->getAs<clang::PointerType>()->getPointeeType();
|
|
auto const pt2 = t2->getAs<clang::PointerType>()->getPointeeType();
|
|
if (auto const ptd1 = pt1->getAs<TypedefType>()) {
|
|
auto const ptd2 = pt2->getAs<TypedefType>();
|
|
if (ptd2 == nullptr || ptd2 != ptd1) {
|
|
return true;
|
|
}
|
|
} else if (auto const ptd2 = pt2->getAs<TypedefType>()) {
|
|
auto const ptd1 = pt1->getAs<TypedefType>();
|
|
if (ptd1 == nullptr || ptd1 != ptd2) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
auto const k1 = sub->getValueKind();
|
|
auto const k3 = expr->getValueKind();
|
|
if ((k3 == VK_XValue && k1 != VK_XValue)
|
|
|| (k3 == VK_LValue && k1 == VK_XValue))
|
|
{
|
|
return true;
|
|
}
|
|
// For <http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2266r1.html> "P2266R1: Simpler
|
|
// implicit move" (as implemented with <https://github.com/llvm/llvm-project/commit/
|
|
// bf20631782183cd19e0bb7219e908c2bbb01a75f> "[clang] Implement P2266 Simpler implicit move"
|
|
// towards Clang 13), don't warn about a static_cast in a return statement like
|
|
//
|
|
// return static_cast<int &>(x);
|
|
//
|
|
// that needs an lvalue but where in a return statement like
|
|
//
|
|
// return x;
|
|
//
|
|
// the expression would now be an xvalue:
|
|
if (k3 == VK_LValue && k1 == VK_LValue && returnExpr_ != nullptr
|
|
&& expr == returnExpr_->IgnoreParens())
|
|
{
|
|
return true;
|
|
}
|
|
// Don't warn if a static_cast on a pointer to function or member function is used to
|
|
// disambiguate an overloaded function:
|
|
if (fnptr) {
|
|
auto e = sub->IgnoreParenImpCasts();
|
|
if (auto const e1 = dyn_cast<UnaryOperator>(e)) {
|
|
if (e1->getOpcode() == UO_AddrOf) {
|
|
e = e1->getSubExpr()->IgnoreParenImpCasts();
|
|
}
|
|
}
|
|
if (auto const e1 = dyn_cast<DeclRefExpr>(e)) {
|
|
if (auto const fdecl = dyn_cast<FunctionDecl>(e1->getDecl())) {
|
|
if (isOverloadedFunction(fdecl)) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// Suppress warnings from static_cast<bool> in C++ definition of assert in
|
|
// <https://sourceware.org/git/?p=glibc.git;a=commit;
|
|
// h=b5889d25e9bf944a89fdd7bcabf3b6c6f6bb6f7c> "assert: Support types
|
|
// without operator== (int) [BZ #21972]":
|
|
if (t1->isBooleanType() && t2->isBooleanType()) {
|
|
auto loc = expr->getBeginLoc();
|
|
if (compiler.getSourceManager().isMacroBodyExpansion(loc)
|
|
&& (Lexer::getImmediateMacroName(
|
|
loc, compiler.getSourceManager(), compiler.getLangOpts())
|
|
== "assert"))
|
|
{
|
|
return true;
|
|
}
|
|
}
|
|
report(
|
|
DiagnosticsEngine::Warning,
|
|
("static_cast from %0 %1 to %2 %3 is redundant%select{| or should be"
|
|
" written as an explicit construction of a temporary}4"),
|
|
expr->getExprLoc())
|
|
<< t1 << printExprValueKind(k1) << t2 << printExprValueKind(k3)
|
|
<< (k3 == compat::VK_PRValue && (k1 != compat::VK_PRValue || t1->isRecordType()))
|
|
<< expr->getSourceRange();
|
|
return true;
|
|
}
|
|
|
|
bool RedundantCast::VisitCXXReinterpretCastExpr(
|
|
CXXReinterpretCastExpr const * expr)
|
|
{
|
|
if (ignoreLocation(expr)) {
|
|
return true;
|
|
}
|
|
if (expr->getTypeAsWritten() == expr->getSubExprAsWritten()->getType())
|
|
//TODO: instead of exact QualType match, allow some variation?
|
|
{
|
|
report(
|
|
DiagnosticsEngine::Warning, "redundant reinterpret_cast from %0 to %1",
|
|
expr->getExprLoc())
|
|
<< expr->getSubExprAsWritten()->getType() << expr->getTypeAsWritten()
|
|
<< expr->getSourceRange();
|
|
return true;
|
|
}
|
|
if (auto const sub = dyn_cast<ImplicitCastExpr>(expr->getSubExpr())) {
|
|
if (sub->getCastKind() == CK_ArrayToPointerDecay && sub->getType() == expr->getType())
|
|
//TODO: instead of exact QualType match, allow some variation?
|
|
{
|
|
if (loplugin::TypeCheck(sub->getType()).Pointer().Const().Char()) {
|
|
if (auto const lit = dyn_cast<clang::StringLiteral>(expr->getSubExprAsWritten())) {
|
|
if (lit->getKind() == compat::StringLiteralKind::UTF8) {
|
|
// Don't warn about
|
|
//
|
|
// redundant_cast<char const *>(u8"...")
|
|
//
|
|
// in pre-C++2a code:
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
report(
|
|
DiagnosticsEngine::Warning, "redundant reinterpret_cast from %0 to %1",
|
|
expr->getExprLoc())
|
|
<< expr->getSubExprAsWritten()->getType() << expr->getTypeAsWritten()
|
|
<< expr->getSourceRange();
|
|
return true;
|
|
}
|
|
}
|
|
if (expr->getSubExpr()->getType()->isVoidPointerType()) {
|
|
auto t = expr->getType()->getAs<clang::PointerType>();
|
|
if (t == nullptr || !t->getPointeeType()->isObjectType()) {
|
|
return true;
|
|
}
|
|
if (rewriter != nullptr) {
|
|
auto loc = expr->getBeginLoc();
|
|
while (compiler.getSourceManager().isMacroArgExpansion(loc)) {
|
|
loc = compiler.getSourceManager().getImmediateMacroCallerLoc(
|
|
loc);
|
|
}
|
|
if (compiler.getSourceManager().isMacroBodyExpansion(loc)) {
|
|
auto loc2 = expr->getEndLoc();
|
|
while (compiler.getSourceManager().isMacroArgExpansion(loc2)) {
|
|
loc2 = compiler.getSourceManager()
|
|
.getImmediateMacroCallerLoc(loc2);
|
|
}
|
|
if (compiler.getSourceManager().isMacroBodyExpansion(loc2)) {
|
|
//TODO: check loc, loc2 are in same macro body expansion
|
|
loc = compiler.getSourceManager().getSpellingLoc(loc);
|
|
}
|
|
}
|
|
auto s = compiler.getSourceManager().getCharacterData(loc);
|
|
auto n = Lexer::MeasureTokenLength(
|
|
loc, compiler.getSourceManager(), compiler.getLangOpts());
|
|
std::string tok(s, n);
|
|
if (tok == "reinterpret_cast" && replaceText(loc, n, "static_cast"))
|
|
{
|
|
return true;
|
|
}
|
|
}
|
|
report(
|
|
DiagnosticsEngine::Warning,
|
|
"reinterpret_cast from %0 to %1 can be simplified to static_cast",
|
|
expr->getExprLoc())
|
|
<< expr->getSubExprAsWritten()->getType() << expr->getType()
|
|
<< expr->getSourceRange();
|
|
} else if (expr->getType()->isVoidPointerType()) {
|
|
auto t = expr->getSubExpr()->getType()->getAs<clang::PointerType>();
|
|
if (t == nullptr || !t->getPointeeType()->isObjectType()) {
|
|
return true;
|
|
}
|
|
report(
|
|
DiagnosticsEngine::Warning,
|
|
("reinterpret_cast from %0 to %1 can be simplified to static_cast"
|
|
" or an implicit conversion"),
|
|
expr->getExprLoc())
|
|
<< expr->getSubExprAsWritten()->getType() << expr->getType()
|
|
<< expr->getSourceRange();
|
|
} else if (expr->getType()->isFundamentalType()) {
|
|
if (auto const sub = dyn_cast<CXXConstCastExpr>(
|
|
expr->getSubExpr()->IgnoreParens()))
|
|
{
|
|
report(
|
|
DiagnosticsEngine::Warning,
|
|
("redundant const_cast from %0 to %1 within reinterpret_cast to"
|
|
" fundamental type %2"),
|
|
expr->getExprLoc())
|
|
<< sub->getSubExprAsWritten()->getType()
|
|
<< sub->getTypeAsWritten() << expr->getTypeAsWritten()
|
|
<< expr->getSourceRange();
|
|
return true;
|
|
}
|
|
}
|
|
if (auto const t1 = expr->getSubExpr()->getType()->getAs<clang::PointerType>()) {
|
|
if (auto const t2 = expr->getType()->getAs<clang::PointerType>()) {
|
|
if (auto const d1 = t1->getPointeeCXXRecordDecl()) {
|
|
if (auto const d2 = t2->getPointeeCXXRecordDecl()) {
|
|
if (d1->hasDefinition() && d1->isDerivedFrom(d2)) {
|
|
report(
|
|
DiagnosticsEngine::Warning,
|
|
"suspicious reinterpret_cast from derived %0 to base %1, maybe this was"
|
|
" meant to be a static_cast",
|
|
expr->getExprLoc())
|
|
<< expr->getSubExprAsWritten()->getType() << expr->getTypeAsWritten()
|
|
<< expr->getSourceRange();
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool RedundantCast::VisitCXXConstCastExpr(CXXConstCastExpr const * expr) {
|
|
if (ignoreLocation(expr)) {
|
|
return true;
|
|
}
|
|
auto const sub = compat::getSubExprAsWritten(expr);
|
|
if (isRedundantConstCast(expr)) {
|
|
report(
|
|
DiagnosticsEngine::Warning,
|
|
"redundant const_cast from %0 %1 to %2 %3", expr->getExprLoc())
|
|
<< sub->getType() << printExprValueKind(sub->getValueKind())
|
|
<< expr->getTypeAsWritten()
|
|
<< printExprValueKind(expr->getValueKind())
|
|
<< expr->getSourceRange();
|
|
return true;
|
|
}
|
|
if (auto const dce = dyn_cast<CXXStaticCastExpr>(
|
|
sub->IgnoreParenImpCasts()))
|
|
{
|
|
auto const sub2 = compat::getSubExprAsWritten(dce);
|
|
auto t1 = sub2->getType().getCanonicalType();
|
|
auto isNullptr = t1->isNullPtrType();
|
|
auto t2 = dce->getType().getCanonicalType();
|
|
auto t3 = expr->getType().getCanonicalType();
|
|
auto redundant = false;
|
|
for (;;) {
|
|
if ((t2.isConstQualified()
|
|
&& (isNullptr || !t1.isConstQualified())
|
|
&& !t3.isConstQualified())
|
|
|| (t2.isVolatileQualified()
|
|
&& (isNullptr || !t1.isVolatileQualified())
|
|
&& !t3.isVolatileQualified()))
|
|
{
|
|
redundant = true;
|
|
break;
|
|
}
|
|
if (!isNullptr) {
|
|
auto const p1 = t1->getAs<clang::PointerType>();
|
|
if (p1 == nullptr) {
|
|
break;
|
|
}
|
|
t1 = p1->getPointeeType();
|
|
isNullptr = t1->isNullPtrType();
|
|
}
|
|
auto const p2 = t2->getAs<clang::PointerType>();
|
|
if (p2 == nullptr) {
|
|
break;
|
|
}
|
|
t2 = p2->getPointeeType();
|
|
auto const p3 = t3->getAs<clang::PointerType>();
|
|
if (p3 == nullptr) {
|
|
break;
|
|
}
|
|
t3 = p3->getPointeeType();
|
|
}
|
|
if (redundant) {
|
|
report(
|
|
DiagnosticsEngine::Warning,
|
|
("redundant static_cast/const_cast combination from %0 via %1"
|
|
" to %2"),
|
|
expr->getExprLoc())
|
|
<< sub2->getType() << dce->getTypeAsWritten()
|
|
<< expr->getTypeAsWritten() << expr->getSourceRange();
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool RedundantCast::VisitCXXFunctionalCastExpr(CXXFunctionalCastExpr const * expr) {
|
|
if (ignoreLocation(expr)) {
|
|
return true;
|
|
}
|
|
// Restrict this to "real" casts (compared to uses of braced-init-list, like
|
|
//
|
|
// Foo{bar, baz}
|
|
//
|
|
// or
|
|
//
|
|
// std::initializer_list<Foo>{bar, baz}
|
|
//
|
|
// ), and only to cases where the sub-expression already is a prvalue of
|
|
// non-class type (and thus the cast is unlikely to be meant to create a
|
|
// temporary):
|
|
auto const t1 = expr->getTypeAsWritten();
|
|
bool const fnptr = t1->isFunctionPointerType() || t1->isMemberFunctionPointerType();
|
|
auto const sub = fnptr ? stopAtFunctionPointerDecay(expr) : compat::getSubExprAsWritten(expr);
|
|
if ((sub->getValueKind() != compat::VK_PRValue && !fnptr) || expr->getType()->isRecordType()
|
|
|| isa<InitListExpr>(sub) || isa<CXXStdInitializerListExpr>(sub))
|
|
{
|
|
return true;
|
|
}
|
|
|
|
// See "There might even be good reasons(?) not to warn inside explicit
|
|
// casts" block in compilerplugins/clang/test/cppunitassertequals.cxx:
|
|
auto const eloc = expr->getExprLoc();
|
|
if (compiler.getSourceManager().isMacroArgExpansion(eloc)) {
|
|
auto const name = Lexer::getImmediateMacroName(
|
|
eloc, compiler.getSourceManager(), compiler.getLangOpts());
|
|
if (name == "CPPUNIT_ASSERT" || name == "CPPUNIT_ASSERT_MESSAGE") {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// Don't warn if a functional cast on a pointer to function or member function is used to
|
|
// disambiguate an overloaded function:
|
|
if (fnptr) {
|
|
auto e = sub->IgnoreParenImpCasts();
|
|
if (auto const e1 = dyn_cast<UnaryOperator>(e)) {
|
|
if (e1->getOpcode() == UO_AddrOf) {
|
|
e = e1->getSubExpr()->IgnoreParenImpCasts();
|
|
}
|
|
}
|
|
if (auto const e1 = dyn_cast<DeclRefExpr>(e)) {
|
|
if (auto const fdecl = dyn_cast<FunctionDecl>(e1->getDecl())) {
|
|
if (isOverloadedFunction(fdecl)) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// See the commit message of d0e7d020fa405ab94f19916ec96fbd4611da0031
|
|
// "socket.c -> socket.cxx" for the reason to have
|
|
//
|
|
// bool(FD_ISSET(...))
|
|
//
|
|
// in sal/osl/unx/socket.cxx:
|
|
//TODO: Better check that sub is exactly an expansion of FD_ISSET:
|
|
if (sub->getEndLoc().isMacroID()) {
|
|
for (auto loc = sub->getBeginLoc();
|
|
loc.isMacroID()
|
|
&& (compiler.getSourceManager()
|
|
.isAtStartOfImmediateMacroExpansion(loc));
|
|
loc = compiler.getSourceManager().getImmediateMacroCallerLoc(loc))
|
|
{
|
|
if (Lexer::getImmediateMacroName(
|
|
loc, compiler.getSourceManager(), compiler.getLangOpts())
|
|
== "FD_ISSET")
|
|
{
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
auto const t2 = sub->getType();
|
|
if (t1.getCanonicalType() != t2.getCanonicalType())
|
|
return true;
|
|
if (!loplugin::isOkToRemoveArithmeticCast(compiler.getASTContext(), t1, t2, expr->getSubExpr()))
|
|
return true;
|
|
report(
|
|
DiagnosticsEngine::Warning,
|
|
"redundant functional cast from %0 to %1", expr->getExprLoc())
|
|
<< t2 << t1 << expr->getSourceRange();
|
|
return true;
|
|
}
|
|
|
|
bool RedundantCast::VisitCXXDynamicCastExpr(CXXDynamicCastExpr const * expr) {
|
|
if (ignoreLocation(expr)) {
|
|
return true;
|
|
}
|
|
auto const sub = compat::getSubExprAsWritten(expr);
|
|
auto const t1 = expr->getTypeAsWritten();
|
|
auto const t2 = sub->getType();
|
|
QualType qt1 = t1.getCanonicalType();
|
|
QualType qt2 = t2.getCanonicalType();
|
|
if (qt1 == qt2)
|
|
{
|
|
report(
|
|
DiagnosticsEngine::Warning,
|
|
"redundant dynamic cast from %0 to %1", expr->getExprLoc())
|
|
<< t2 << t1 << expr->getSourceRange();
|
|
return true;
|
|
}
|
|
if (qt1->isPointerType() && qt2->isPointerType())
|
|
{
|
|
// casting from 'T*' to 'const T*' is redundant, so compare without the qualifiers
|
|
qt1 = qt1->getPointeeType().getUnqualifiedType();
|
|
qt2 = qt2->getPointeeType().getUnqualifiedType();
|
|
if (qt1 == qt2)
|
|
{
|
|
report(
|
|
DiagnosticsEngine::Warning,
|
|
"redundant dynamic cast from %0 to %1", expr->getExprLoc())
|
|
<< t2 << t1 << expr->getSourceRange();
|
|
return true;
|
|
}
|
|
if (qt1->getAsCXXRecordDecl() && qt2->getAsCXXRecordDecl() && qt2->getAsCXXRecordDecl()->isDerivedFrom(qt1->getAsCXXRecordDecl()))
|
|
{
|
|
report(
|
|
DiagnosticsEngine::Warning,
|
|
"redundant dynamic upcast from %0 to %1", expr->getExprLoc())
|
|
<< t2 << t1 << expr->getSourceRange();
|
|
return true;
|
|
}
|
|
}
|
|
else if (qt1->isReferenceType() && qt2->isRecordType())
|
|
{
|
|
// casting from 'T&' to 'const T&' is redundant, so compare without the qualifiers
|
|
qt1 = qt1->getPointeeType().getUnqualifiedType();
|
|
qt2 = qt2.getUnqualifiedType();
|
|
if (qt1 == qt2)
|
|
{
|
|
report(
|
|
DiagnosticsEngine::Warning,
|
|
"redundant dynamic cast from %0 to %1", expr->getExprLoc())
|
|
<< t2 << t1 << expr->getSourceRange();
|
|
return true;
|
|
}
|
|
if (qt1->getAsCXXRecordDecl() && qt2->getAsCXXRecordDecl()->isDerivedFrom(qt1->getAsCXXRecordDecl()))
|
|
{
|
|
report(
|
|
DiagnosticsEngine::Warning,
|
|
"redundant dynamic upcast from %0 to %1", expr->getExprLoc())
|
|
<< t2 << t1 << expr->getSourceRange();
|
|
return true;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool RedundantCast::VisitCallExpr(CallExpr const * expr) {
|
|
if (ignoreLocation(expr)) {
|
|
return true;
|
|
}
|
|
auto f = expr->getDirectCallee();
|
|
if (f == nullptr || !f->isVariadic()
|
|
|| expr->getNumArgs() <= f->getNumParams())
|
|
{
|
|
return true;
|
|
}
|
|
for (auto i = f->getNumParams(); i != expr->getNumArgs(); ++i) {
|
|
auto a = expr->getArg(i);
|
|
if (a->getType()->isPointerType()) {
|
|
auto e = dyn_cast<CXXConstCastExpr>(a->IgnoreParenImpCasts());
|
|
if (e != nullptr) {
|
|
report(
|
|
DiagnosticsEngine::Warning,
|
|
"redundant const_cast of variadic function argument",
|
|
e->getExprLoc())
|
|
<< expr->getSourceRange();
|
|
}
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool RedundantCast::VisitCXXDeleteExpr(CXXDeleteExpr const * expr) {
|
|
if (ignoreLocation(expr)) {
|
|
return true;
|
|
}
|
|
auto e = dyn_cast<CXXConstCastExpr>(
|
|
expr->getArgument()->IgnoreParenImpCasts());
|
|
if (e != nullptr) {
|
|
report(
|
|
DiagnosticsEngine::Warning,
|
|
"redundant const_cast in delete expression", e->getExprLoc())
|
|
<< expr->getSourceRange();
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool RedundantCast::visitBinOp(BinaryOperator const * expr) {
|
|
if (ignoreLocation(expr)) {
|
|
return true;
|
|
}
|
|
if (expr->getLHS()->getType()->isPointerType()
|
|
&& expr->getRHS()->getType()->isPointerType())
|
|
{
|
|
auto e = dyn_cast<CXXConstCastExpr>(
|
|
expr->getLHS()->IgnoreParenImpCasts());
|
|
if (e != nullptr) {
|
|
report(
|
|
DiagnosticsEngine::Warning,
|
|
"redundant const_cast on lhs of pointer %select{comparison|subtraction}0 expression",
|
|
e->getExprLoc())
|
|
<< (expr->getOpcode() == BO_Sub) << expr->getSourceRange();
|
|
}
|
|
e = dyn_cast<CXXConstCastExpr>(
|
|
expr->getRHS()->IgnoreParenImpCasts());
|
|
if (e != nullptr) {
|
|
report(
|
|
DiagnosticsEngine::Warning,
|
|
"redundant const_cast on rhs of pointer %select{comparison|subtraction}0 expression",
|
|
e->getExprLoc())
|
|
<< (expr->getOpcode() == BO_Sub) << expr->getSourceRange();
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool RedundantCast::isOverloadedFunction(FunctionDecl const * decl) {
|
|
auto const ctx = decl->getDeclContext();
|
|
if (!ctx->isLookupContext()) {
|
|
return false;
|
|
}
|
|
auto const canon = decl->getCanonicalDecl();
|
|
auto const res = ctx->lookup(decl->getDeclName());
|
|
for (auto d = res.begin(); d != res.end(); ++d) {
|
|
if (auto const f = dyn_cast<FunctionDecl>(*d)) {
|
|
if (f->getCanonicalDecl() != canon) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
loplugin::Plugin::Registration<RedundantCast> X("redundantcast", true);
|
|
|
|
}
|
|
|
|
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|