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//===--- SmartPtrArrayMismatchCheck.cpp - clang-tidy ----------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "SmartPtrArrayMismatchCheck.h"
#include "../utils/ASTUtils.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Lex/Lexer.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace bugprone {
namespace {
constexpr char ConstructExprN[] = "found_construct_expr";
constexpr char NewExprN[] = "found_new_expr";
constexpr char ConstructorN[] = "found_constructor";
bool isInSingleDeclStmt(const DeclaratorDecl *D) {
const DynTypedNodeList Parents =
D->getASTContext().getParentMapContext().getParents(*D);
for (const DynTypedNode &PNode : Parents)
if (const auto *PDecl = PNode.get<DeclStmt>())
return PDecl->isSingleDecl();
return false;
}
const DeclaratorDecl *getConstructedVarOrField(const Expr *FoundConstructExpr,
ASTContext &Ctx) {
const DynTypedNodeList ConstructParents =
Ctx.getParentMapContext().getParents(*FoundConstructExpr);
if (ConstructParents.size() != 1)
return nullptr;
const auto *ParentDecl = ConstructParents.begin()->get<DeclaratorDecl>();
if (isa_and_nonnull<VarDecl, FieldDecl>(ParentDecl))
return ParentDecl;
return nullptr;
}
} // namespace
const char SmartPtrArrayMismatchCheck::PointerTypeN[] = "pointer_type";
SmartPtrArrayMismatchCheck::SmartPtrArrayMismatchCheck(
StringRef Name, ClangTidyContext *Context, StringRef SmartPointerName)
: ClangTidyCheck(Name, Context), SmartPointerName(SmartPointerName) {}
void SmartPtrArrayMismatchCheck::storeOptions(
ClangTidyOptions::OptionMap &Opts) {}
void SmartPtrArrayMismatchCheck::registerMatchers(MatchFinder *Finder) {
// For both shared and unique pointers, we need to find constructor with
// exactly one parameter that has the pointer type. Other constructors are
// not applicable for this check.
auto FindConstructor =
cxxConstructorDecl(ofClass(getSmartPointerClassMatcher()),
parameterCountIs(1), isExplicit())
.bind(ConstructorN);
auto FindConstructExpr =
cxxConstructExpr(
hasDeclaration(FindConstructor), argumentCountIs(1),
hasArgument(0,
cxxNewExpr(isArray(),
hasType(hasCanonicalType(pointerType(
pointee(equalsBoundNode(PointerTypeN))))))
.bind(NewExprN)))
.bind(ConstructExprN);
Finder->addMatcher(FindConstructExpr, this);
}
void SmartPtrArrayMismatchCheck::check(const MatchFinder::MatchResult &Result) {
const auto *FoundNewExpr = Result.Nodes.getNodeAs<CXXNewExpr>(NewExprN);
const auto *FoundConstructExpr =
Result.Nodes.getNodeAs<CXXConstructExpr>(ConstructExprN);
const auto *FoundConstructorDecl =
Result.Nodes.getNodeAs<CXXConstructorDecl>(ConstructorN);
ASTContext &Ctx = FoundConstructorDecl->getASTContext();
const DeclaratorDecl *VarOrField =
getConstructedVarOrField(FoundConstructExpr, Ctx);
auto D = diag(FoundNewExpr->getBeginLoc(),
"%0 pointer to non-array is initialized with array")
<< SmartPointerName;
D << FoundNewExpr->getSourceRange();
if (VarOrField) {
auto TSTypeLoc = VarOrField->getTypeSourceInfo()
->getTypeLoc()
.getAsAdjusted<clang::TemplateSpecializationTypeLoc>();
assert(TSTypeLoc.getNumArgs() >= 1 &&
"Matched type should have at least 1 template argument.");
SourceRange TemplateArgumentRange = TSTypeLoc.getArgLoc(0)
.getTypeSourceInfo()
->getTypeLoc()
.getSourceRange();
D << TemplateArgumentRange;
if (isInSingleDeclStmt(VarOrField)) {
const SourceManager &SM = Ctx.getSourceManager();
if (!utils::rangeCanBeFixed(TemplateArgumentRange, &SM))
return;
SourceLocation InsertLoc = Lexer::getLocForEndOfToken(
TemplateArgumentRange.getEnd(), 0, SM, Ctx.getLangOpts());
D << FixItHint::CreateInsertion(InsertLoc, "[]");
}
}
}
} // namespace bugprone
} // namespace tidy
} // namespace clang
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