forked from OSchip/llvm-project
115 lines
3.2 KiB
C++
115 lines
3.2 KiB
C++
//===---- CheckerHelpers.cpp - Helper functions for checkers ----*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines several static functions for use in checkers.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerHelpers.h"
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#include "clang/AST/Decl.h"
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#include "clang/AST/Expr.h"
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namespace clang {
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namespace ento {
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// Recursively find any substatements containing macros
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bool containsMacro(const Stmt *S) {
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if (S->getBeginLoc().isMacroID())
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return true;
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if (S->getEndLoc().isMacroID())
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return true;
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for (const Stmt *Child : S->children())
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if (Child && containsMacro(Child))
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return true;
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return false;
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}
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// Recursively find any substatements containing enum constants
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bool containsEnum(const Stmt *S) {
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const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(S);
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if (DR && isa<EnumConstantDecl>(DR->getDecl()))
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return true;
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for (const Stmt *Child : S->children())
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if (Child && containsEnum(Child))
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return true;
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return false;
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}
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// Recursively find any substatements containing static vars
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bool containsStaticLocal(const Stmt *S) {
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const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(S);
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if (DR)
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if (const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl()))
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if (VD->isStaticLocal())
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return true;
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for (const Stmt *Child : S->children())
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if (Child && containsStaticLocal(Child))
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return true;
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return false;
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}
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// Recursively find any substatements containing __builtin_offsetof
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bool containsBuiltinOffsetOf(const Stmt *S) {
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if (isa<OffsetOfExpr>(S))
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return true;
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for (const Stmt *Child : S->children())
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if (Child && containsBuiltinOffsetOf(Child))
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return true;
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return false;
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}
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// Extract lhs and rhs from assignment statement
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std::pair<const clang::VarDecl *, const clang::Expr *>
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parseAssignment(const Stmt *S) {
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const VarDecl *VD = nullptr;
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const Expr *RHS = nullptr;
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if (auto Assign = dyn_cast_or_null<BinaryOperator>(S)) {
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if (Assign->isAssignmentOp()) {
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// Ordinary assignment
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RHS = Assign->getRHS();
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if (auto DE = dyn_cast_or_null<DeclRefExpr>(Assign->getLHS()))
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VD = dyn_cast_or_null<VarDecl>(DE->getDecl());
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}
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} else if (auto PD = dyn_cast_or_null<DeclStmt>(S)) {
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// Initialization
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assert(PD->isSingleDecl() && "We process decls one by one");
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VD = dyn_cast_or_null<VarDecl>(PD->getSingleDecl());
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RHS = VD->getAnyInitializer();
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}
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return std::make_pair(VD, RHS);
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}
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Nullability getNullabilityAnnotation(QualType Type) {
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const auto *AttrType = Type->getAs<AttributedType>();
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if (!AttrType)
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return Nullability::Unspecified;
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if (AttrType->getAttrKind() == attr::TypeNullable)
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return Nullability::Nullable;
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else if (AttrType->getAttrKind() == attr::TypeNonNull)
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return Nullability::Nonnull;
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return Nullability::Unspecified;
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}
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} // end namespace ento
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} // end namespace clang
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