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#include "clang/Analysis/FlowSensitive/SmartPointerAccessorCaching.h"
#include "clang/AST/CanonicalType.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/Type.h"
#include "clang/ASTMatchers/ASTMatchers.h"
#include "clang/ASTMatchers/ASTMatchersMacros.h"
#include "clang/Basic/OperatorKinds.h"
namespace clang::dataflow {
namespace {
using ast_matchers::callee;
using ast_matchers::cxxMemberCallExpr;
using ast_matchers::cxxMethodDecl;
using ast_matchers::cxxOperatorCallExpr;
using ast_matchers::hasCanonicalType;
using ast_matchers::hasName;
using ast_matchers::hasOverloadedOperatorName;
using ast_matchers::ofClass;
using ast_matchers::parameterCountIs;
using ast_matchers::pointerType;
using ast_matchers::referenceType;
using ast_matchers::returns;
CanQualType getLikeReturnType(QualType RT) {
if (!RT.isNull() && RT->isPointerType()) {
return RT->getPointeeType()
->getCanonicalTypeUnqualified()
.getUnqualifiedType();
}
return {};
}
CanQualType valueLikeReturnType(QualType RT) {
if (!RT.isNull() && RT->isReferenceType()) {
return RT.getNonReferenceType()
->getCanonicalTypeUnqualified()
.getUnqualifiedType();
}
return {};
}
CanQualType pointerLikeReturnType(const CXXRecordDecl &RD) {
// We may want to cache this search, but in current profiles it hasn't shown
// up as a hot spot (possibly because there aren't many hits, relatively).
CanQualType StarReturnType, ArrowReturnType;
for (const auto *MD : RD.methods()) {
// We only consider methods that are const and have zero parameters.
// It may be that there is a non-const overload for the method, but
// there should at least be a const overload as well.
if (!MD->isConst() || MD->getNumParams() != 0)
continue;
switch (MD->getOverloadedOperator()) {
case OO_Star:
StarReturnType = valueLikeReturnType(MD->getReturnType());
break;
case OO_Arrow:
ArrowReturnType = getLikeReturnType(MD->getReturnType());
break;
default:
break;
}
}
if (!StarReturnType.isNull() && !ArrowReturnType.isNull() &&
StarReturnType == ArrowReturnType)
return StarReturnType;
return {};
}
QualType findReturnType(const CXXRecordDecl &RD, StringRef MethodName) {
for (const auto *MD : RD.methods()) {
// We only consider methods that are const and have zero parameters.
// It may be that there is a non-const overload for the method, but
// there should at least be a const overload as well.
if (!MD->isConst() || MD->getNumParams() != 0 ||
MD->getOverloadedOperator() != OO_None)
continue;
clang::IdentifierInfo *II = MD->getIdentifier();
if (II && II->isStr(MethodName))
return MD->getReturnType();
}
return {};
}
} // namespace
} // namespace clang::dataflow
// AST_MATCHER macros create an "internal" namespace, so we put it in
// its own anonymous namespace instead of in clang::dataflow.
namespace {
using clang::dataflow::findReturnType;
using clang::dataflow::getLikeReturnType;
using clang::dataflow::pointerLikeReturnType;
using clang::dataflow::valueLikeReturnType;
AST_MATCHER_P(clang::CXXRecordDecl, smartPointerClassWithGetLike,
clang::StringRef, MethodName) {
auto RT = pointerLikeReturnType(Node);
if (RT.isNull())
return false;
return getLikeReturnType(findReturnType(Node, MethodName)) == RT;
}
AST_MATCHER_P(clang::CXXRecordDecl, smartPointerClassWithValueLike,
clang::StringRef, MethodName) {
auto RT = pointerLikeReturnType(Node);
if (RT.isNull())
return false;
return valueLikeReturnType(findReturnType(Node, MethodName)) == RT;
}
AST_MATCHER(clang::CXXRecordDecl, smartPointerClassWithGetOrValue) {
auto RT = pointerLikeReturnType(Node);
if (RT.isNull())
return false;
return getLikeReturnType(findReturnType(Node, "get")) == RT ||
valueLikeReturnType(findReturnType(Node, "value")) == RT;
}
AST_MATCHER(clang::CXXRecordDecl, pointerClass) {
return !pointerLikeReturnType(Node).isNull();
}
} // namespace
namespace clang::dataflow {
ast_matchers::StatementMatcher isSmartPointerLikeOperatorStar() {
return cxxOperatorCallExpr(
hasOverloadedOperatorName("*"),
callee(cxxMethodDecl(parameterCountIs(0),
returns(hasCanonicalType(referenceType())),
ofClass(smartPointerClassWithGetOrValue()))));
}
ast_matchers::StatementMatcher isSmartPointerLikeOperatorArrow() {
return cxxOperatorCallExpr(
hasOverloadedOperatorName("->"),
callee(cxxMethodDecl(parameterCountIs(0),
returns(hasCanonicalType(pointerType())),
ofClass(smartPointerClassWithGetOrValue()))));
}
ast_matchers::StatementMatcher isPointerLikeOperatorStar() {
return cxxOperatorCallExpr(
hasOverloadedOperatorName("*"),
callee(cxxMethodDecl(parameterCountIs(0),
returns(hasCanonicalType(referenceType())),
ofClass(pointerClass()))));
}
ast_matchers::StatementMatcher isPointerLikeOperatorArrow() {
return cxxOperatorCallExpr(
hasOverloadedOperatorName("->"),
callee(cxxMethodDecl(parameterCountIs(0),
returns(hasCanonicalType(pointerType())),
ofClass(pointerClass()))));
}
ast_matchers::StatementMatcher
isSmartPointerLikeValueMethodCall(clang::StringRef MethodName) {
return cxxMemberCallExpr(callee(cxxMethodDecl(
parameterCountIs(0), returns(hasCanonicalType(referenceType())),
hasName(MethodName),
ofClass(smartPointerClassWithValueLike(MethodName)))));
}
ast_matchers::StatementMatcher
isSmartPointerLikeGetMethodCall(clang::StringRef MethodName) {
return cxxMemberCallExpr(callee(cxxMethodDecl(
parameterCountIs(0), returns(hasCanonicalType(pointerType())),
hasName(MethodName), ofClass(smartPointerClassWithGetLike(MethodName)))));
}
const FunctionDecl *
getCanonicalSmartPointerLikeOperatorCallee(const CallExpr *CE) {
const FunctionDecl *CanonicalCallee = nullptr;
const CXXMethodDecl *Callee =
cast_or_null<CXXMethodDecl>(CE->getDirectCallee());
if (Callee == nullptr)
return nullptr;
const CXXRecordDecl *RD = Callee->getParent();
if (RD == nullptr)
return nullptr;
for (const auto *MD : RD->methods()) {
if (MD->getOverloadedOperator() == OO_Star && MD->isConst() &&
MD->getNumParams() == 0 && MD->getReturnType()->isReferenceType()) {
CanonicalCallee = MD;
break;
}
}
return CanonicalCallee;
}
} // namespace clang::dataflow
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