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/*
This file is part of the clazy static checker.
Copyright (C) 2016-2017 Sergio Martins <smartins@kde.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "TypeUtils.h"
#include "Utils.h"
#include "StmtBodyRange.h"
#include "ClazyContext.h"
#include <HierarchyUtils.h>
#include <StringUtils.h>
#include <clang/Frontend/CompilerInstance.h>
#include <clang/AST/ASTContext.h>
using namespace clang;
bool TypeUtils::classifyQualType(const ClazyContext *context, const VarDecl *varDecl, QualTypeClassification &classif, clang::Stmt *body)
{
if (!varDecl)
return false;
QualType qualType = TypeUtils::unrefQualType(varDecl->getType());
const Type *paramType = qualType.getTypePtrOrNull();
if (!paramType || paramType->isIncompleteType())
return false;
if (isUndeducibleAuto(paramType))
return false;
classif.size_of_T = context->astContext.getTypeSize(qualType) / 8;
classif.isBig = classif.size_of_T > 16;
CXXRecordDecl *recordDecl = paramType->getAsCXXRecordDecl();
classif.isNonTriviallyCopyable = recordDecl && (recordDecl->hasNonTrivialCopyConstructor() || recordDecl->hasNonTrivialDestructor());
classif.isReference = varDecl->getType()->isLValueReferenceType();
classif.isConst = qualType.isConstQualified();
if (varDecl->getType()->isRValueReferenceType()) // && ref, nothing to do here
return true;
if (classif.isConst && !classif.isReference) {
classif.passNonTriviallyCopyableByConstRef = classif.isNonTriviallyCopyable;
if (classif.isBig) {
classif.passBigTypeByConstRef = true;
}
} else if (classif.isConst && classif.isReference && !classif.isNonTriviallyCopyable && !classif.isBig) {
classif.passSmallTrivialByValue = true;
} else if (!classif.isConst && !classif.isReference && (classif.isBig || classif.isNonTriviallyCopyable)) {
if (body && (Utils::containsNonConstMemberCall(context->parentMap, body, varDecl) || Utils::isPassedToFunction(StmtBodyRange(body), varDecl, /*byrefonly=*/ true)))
return true;
classif.passNonTriviallyCopyableByConstRef = classif.isNonTriviallyCopyable;
if (classif.isBig) {
classif.passBigTypeByConstRef = true;
}
}
return true;
}
void TypeUtils::heapOrStackAllocated(Expr *arg, const std::string &type,
const clang::LangOptions &lo,
bool &isStack, bool &isHeap)
{
isStack = false;
isHeap = false;
if (isa<CXXNewExpr>(arg)) {
isHeap = true;
return;
}
std::vector<DeclRefExpr*> declrefs;
clazy::getChilds(arg, declrefs, 3);
std::vector<DeclRefExpr*> interestingDeclRefs;
for (auto declref : declrefs) {
auto t = declref->getType().getTypePtrOrNull();
if (!t)
continue;
// Remove the '*' if it's a pointer
QualType qt = t->isPointerType() ? t->getPointeeType()
: declref->getType();
if (t && type == clazy::simpleTypeName(qt, lo)) {
interestingDeclRefs.push_back(declref);
}
}
if (interestingDeclRefs.size() > 1) {
// Too complex
return;
}
if (!interestingDeclRefs.empty()) {
auto declref = interestingDeclRefs[0];
isStack = !declref->getType().getTypePtr()->isPointerType();
isHeap = !isStack;
}
}
bool TypeUtils::derivesFrom(const CXXRecordDecl *derived, const CXXRecordDecl *possibleBase,
std::vector<CXXRecordDecl*> *baseClasses)
{
if (!derived || !possibleBase || derived == possibleBase)
return false;
for (auto base : derived->bases()) {
const Type *type = base.getType().getTypePtrOrNull();
if (!type) continue;
CXXRecordDecl *baseDecl = type->getAsCXXRecordDecl();
baseDecl = baseDecl ? baseDecl->getCanonicalDecl() : nullptr;
if (possibleBase == baseDecl || derivesFrom(baseDecl, possibleBase, baseClasses)) {
if (baseClasses)
baseClasses->push_back(baseDecl);
return true;
}
}
return false;
}
bool TypeUtils::derivesFrom(const clang::CXXRecordDecl *derived, const std::string &possibleBase)
{
if (!derived || !derived->hasDefinition())
return false;
if (derived->getQualifiedNameAsString() == possibleBase)
return true;
for (auto base : derived->bases()) {
if (derivesFrom(recordFromBaseSpecifier(base), possibleBase))
return true;
}
return false;
}
bool TypeUtils::derivesFrom(QualType derivedQT, const std::string &possibleBase)
{
derivedQT = pointeeQualType(derivedQT);
const auto t = derivedQT.getTypePtrOrNull();
return t ? derivesFrom(t->getAsCXXRecordDecl(), possibleBase) : false;
}
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