diff options
Diffstat (limited to 'compilerplugins/clang/check.cxx')
| -rw-r--r-- | compilerplugins/clang/check.cxx | 369 |
1 files changed, 369 insertions, 0 deletions
diff --git a/compilerplugins/clang/check.cxx b/compilerplugins/clang/check.cxx new file mode 100644 index 000000000..b4317c07b --- /dev/null +++ b/compilerplugins/clang/check.cxx @@ -0,0 +1,369 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + */ + +#include <cassert> + +#include <clang/AST/DeclCXX.h> +#include <clang/AST/DeclTemplate.h> + +#include "check.hxx" + +namespace loplugin { + +TypeCheck TypeCheck::NonConst() const { + return !type_.isNull() && !type_.isConstQualified() + ? *this : TypeCheck(); + // returning TypeCheck(type_.getUnqualifiedType()) instead of *this + // may look tempting, but could remove sugar we might be interested in + // checking for +} + +TypeCheck TypeCheck::NonConstVolatile() const { + return + (!type_.isNull() && !type_.isConstQualified() + && !type_.isVolatileQualified()) + ? *this : TypeCheck(); + // returning TypeCheck(type_.getUnqualifiedType()) instead of *this + // may look tempting, but could remove sugar we might be interested in + // checking for +} + +TypeCheck TypeCheck::Const() const { + return + (!type_.isNull() && type_.isConstQualified() + && !type_.isVolatileQualified()) + ? *this : TypeCheck(); + // returning TypeCheck(type_.getUnqualifiedType()) instead of *this + // may look tempting, but could remove sugar we might be interested in + // checking for +} + +TypeCheck TypeCheck::Volatile() const { + return + (!type_.isNull() && !type_.isConstQualified() + && type_.isVolatileQualified()) + ? *this : TypeCheck(); + // returning TypeCheck(type_.getUnqualifiedType()) instead of *this + // may look tempting, but could remove sugar we might be interested in + // checking for +} + +TypeCheck TypeCheck::ConstVolatile() const { + return + (!type_.isNull() && type_.isConstQualified() + && type_.isVolatileQualified()) + ? *this : TypeCheck(); + // returning TypeCheck(type_.getUnqualifiedType()) instead of *this + // may look tempting, but could remove sugar we might be interested in + // checking for +} + +TerminalCheck TypeCheck::Void() const { + return TerminalCheck( + !type_.isNull() + && type_->isSpecificBuiltinType(clang::BuiltinType::Void)); +} + +TerminalCheck TypeCheck::Char() const { + return TerminalCheck( + !type_.isNull() + && (type_->isSpecificBuiltinType(clang::BuiltinType::Char_S) + || type_->isSpecificBuiltinType(clang::BuiltinType::Char_U))); +} + +TerminalCheck TypeCheck::AnyBoolean() const { + if (type_->isBooleanType()) { + return TerminalCheck(true); + } + auto t = type_->getAs<clang::TypedefType>(); + if (t == nullptr) { + return TerminalCheck(false); + } + auto n =t->getDecl()->getName(); + return TerminalCheck( + n == "sal_Bool" || n == "BOOL" || n == "Boolean" || n == "FT_Bool" + || n == "FcBool" || n == "GLboolean" || n == "NPBool" || n == "TW_BOOL" + || n == "UBool" || n == "boolean" || n == "dbus_bool_t" + || n == "gboolean" || n == "hb_bool_t" || n == "jboolean" || n == "my_bool"); +} + +TypeCheck TypeCheck::LvalueReference() const { + if (!type_.isNull()) { + auto const t = type_->getAs<clang::LValueReferenceType>(); + if (t != nullptr) { + return TypeCheck(t->getPointeeType()); + } + } + return TypeCheck(); +} + +TypeCheck TypeCheck::Pointer() const { + if (!type_.isNull()) { + auto const t = type_->getAs<clang::PointerType>(); + if (t != nullptr) { + return TypeCheck(t->getPointeeType()); + } + } + return TypeCheck(); +} + +TerminalCheck TypeCheck::Enum() const { + if (!type_.isNull()) { + auto const t = type_->getAs<clang::EnumType>(); + if (t != nullptr) { + return TerminalCheck(true); + } + } + return TerminalCheck(false); +} + +TypeCheck TypeCheck::Typedef() const { + if (!type_.isNull()) { + if (auto const t = type_->getAs<clang::TypedefType>()) { + return TypeCheck(t->desugar()); + } + } + return TypeCheck(); +} + +DeclCheck TypeCheck::TemplateSpecializationClass() const { + if (!type_.isNull()) { + if (auto const t = type_->getAs<clang::TemplateSpecializationType>()) { + if (!t->isTypeAlias()) { + if (auto const d = llvm::dyn_cast_or_null<clang::ClassTemplateDecl>( + t->getTemplateName().getAsTemplateDecl())) + { + return DeclCheck(d->getTemplatedDecl()); + } + } + } + } + return DeclCheck(); +} + +TypeCheck TypeCheck::NotSubstTemplateTypeParmType() const { + return + (!type_.isNull() + && type_->getAs<clang::SubstTemplateTypeParmType>() == nullptr) + ? *this : TypeCheck(); +} + +ContextCheck DeclCheck::Operator(clang::OverloadedOperatorKind op) const { + assert(op != clang::OO_None); + auto f = llvm::dyn_cast_or_null<clang::FunctionDecl>(decl_); + return ContextCheck( + f != nullptr && f->getOverloadedOperator() == op + ? f->getDeclContext() : nullptr); +} + +ContextCheck DeclCheck::MemberFunction() const { + auto m = llvm::dyn_cast_or_null<clang::CXXMethodDecl>(decl_); + return ContextCheck(m == nullptr ? nullptr : m->getParent()); +} + +namespace { + +bool isGlobalNamespace(clang::DeclContext const * context) { + assert(context != nullptr); + return (context->isLookupContext() ? context : context->getLookupParent())->isTranslationUnit(); +} + +} + +TerminalCheck ContextCheck::GlobalNamespace() const { + return TerminalCheck(context_ != nullptr && isGlobalNamespace(context_)); +} + +TerminalCheck ContextCheck::StdNamespace() const { + return TerminalCheck( + context_ != nullptr && context_->isStdNamespace()); +} + +namespace { + +bool isStdOrNestedNamespace(clang::DeclContext const * context) { + assert(context != nullptr); + if (!context->isNamespace()) { + return false; + } + if (isGlobalNamespace(context)) { + return false; + } + if (context->isStdNamespace()) { + return true; + } + return isStdOrNestedNamespace(context->getParent()); +} + +} + +TerminalCheck ContextCheck::StdOrNestedNamespace() const { + return TerminalCheck(context_ != nullptr && isStdOrNestedNamespace(context_)); +} + +ContextCheck ContextCheck::AnonymousNamespace() const { + auto n = llvm::dyn_cast_or_null<clang::NamespaceDecl>(context_); + return ContextCheck( + n != nullptr && n->isAnonymousNamespace() ? n->getParent() : nullptr); +} + +namespace { + +bool BaseCheckNotSomethingInterestingSubclass(const clang::CXXRecordDecl *BaseDefinition) { + if (BaseDefinition) { + auto tc = TypeCheck(BaseDefinition); + if (tc.Class("Dialog").GlobalNamespace() || tc.Class("SfxPoolItem").GlobalNamespace()) { + return false; + } + } + return true; +} + +bool isDerivedFromSomethingInteresting(const clang::CXXRecordDecl *decl) { + if (!decl) + return false; + auto tc = TypeCheck(decl); + if (tc.Class("Dialog")) + return true; + if (tc.Class("SfxPoolItem")) + return true; + if (!decl->hasDefinition()) { + return false; + } + if (// not sure what hasAnyDependentBases() does, + // but it avoids classes we don't want, e.g. WeakAggComponentImplHelper1 + !decl->hasAnyDependentBases() && + !decl->forallBases(BaseCheckNotSomethingInterestingSubclass)) { + return true; + } + return false; +} + +} + +bool isExtraWarnUnusedType(clang::QualType type) { + auto const rec = type->getAsCXXRecordDecl(); + if (rec == nullptr) { + return false; + } + auto const tc = TypeCheck(rec); + // Check some common non-LO types: + if (tc.Class("basic_string").StdNamespace() + || tc.Class("deque").StdNamespace() + || tc.Class("list").StdNamespace() + || tc.Class("map").StdNamespace() + || tc.Class("pair").StdNamespace() + || tc.Class("queue").StdNamespace() + || tc.Class("set").StdNamespace() + || tc.Class("stack").StdNamespace() + || tc.Class("unordered_map").StdNamespace() + || tc.Class("unordered_set").StdNamespace() + || tc.Class("vector").StdNamespace()) + { + return true; + } + return isDerivedFromSomethingInteresting(rec); +} + +namespace { + +// Make sure Foo and ::Foo are considered equal: +bool areSameSugaredType(clang::QualType type1, clang::QualType type2) { + auto t1 = type1.getLocalUnqualifiedType(); + if (auto const et = llvm::dyn_cast<clang::ElaboratedType>(t1)) { + t1 = et->getNamedType(); + } + auto t2 = type2.getLocalUnqualifiedType(); + if (auto const et = llvm::dyn_cast<clang::ElaboratedType>(t2)) { + t2 = et->getNamedType(); + } + return t1 == t2; +} + +bool isArithmeticOp(clang::Expr const * expr) { + expr = expr->IgnoreParenImpCasts(); + if (auto const e = llvm::dyn_cast<clang::BinaryOperator>(expr)) { + switch (e->getOpcode()) { + case clang::BO_Mul: + case clang::BO_Div: + case clang::BO_Rem: + case clang::BO_Add: + case clang::BO_Sub: + case clang::BO_Shl: + case clang::BO_Shr: + case clang::BO_And: + case clang::BO_Xor: + case clang::BO_Or: + return true; + case clang::BO_Comma: + return isArithmeticOp(e->getRHS()); + default: + return false; + } + } + return llvm::isa<clang::UnaryOperator>(expr) + || llvm::isa<clang::AbstractConditionalOperator>(expr); +} + +} + +bool isOkToRemoveArithmeticCast( + clang::ASTContext & context, clang::QualType t1, clang::QualType t2, const clang::Expr* subExpr) +{ + // Don't warn if the types are arithmetic (in the C++ meaning), and: either + // at least one is a typedef or decltype (and if both are, they're different), + // or the sub-expression involves some operation that is likely to change + // types through promotion, or the sub-expression is an integer literal (so + // its type generally depends on its value and suffix if any---even with a + // suffix like L it could still be either long or long long): + if ((t1->isIntegralType(context) + || t1->isRealFloatingType()) + && ((!areSameSugaredType(t1, t2) + && (loplugin::TypeCheck(t1).Typedef() + || loplugin::TypeCheck(t2).Typedef() + || llvm::isa<clang::DecltypeType>(t1) || llvm::isa<clang::DecltypeType>(t2))) + || isArithmeticOp(subExpr) + || llvm::isa<clang::IntegerLiteral>(subExpr->IgnoreParenImpCasts()))) + { + return false; + } + return true; +} + + +static bool BaseCheckNotSubclass(const clang::CXXRecordDecl *BaseDefinition, void *p) { + if (!BaseDefinition) + return true; + auto const & base = *static_cast<const DeclChecker *>(p); + if (base(BaseDefinition)) { + return false; + } + return true; +} + +bool isDerivedFrom(const clang::CXXRecordDecl *decl, DeclChecker base) { + if (!decl) + return false; + if (base(decl)) + return true; + if (!decl->hasDefinition()) { + return false; + } + if (!decl->forallBases( + [&base](const clang::CXXRecordDecl *BaseDefinition) -> bool + { return BaseCheckNotSubclass(BaseDefinition, &base); })) + { + return true; + } + return false; +} + +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |