153 lines
4.4 KiB
C++
153 lines
4.4 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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#include "clang/Lex/Preprocessor.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 = cast<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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llvm::Optional<int> tryExpandAsInteger(StringRef Macro,
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const Preprocessor &PP) {
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const auto *MacroII = PP.getIdentifierInfo(Macro);
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if (!MacroII)
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return llvm::None;
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const MacroInfo *MI = PP.getMacroInfo(MacroII);
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if (!MI)
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return llvm::None;
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// Filter out parens.
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std::vector<Token> FilteredTokens;
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FilteredTokens.reserve(MI->tokens().size());
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for (auto &T : MI->tokens())
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if (!T.isOneOf(tok::l_paren, tok::r_paren))
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FilteredTokens.push_back(T);
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// Parse an integer at the end of the macro definition.
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const Token &T = FilteredTokens.back();
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// FIXME: EOF macro token coming from a PCH file on macOS while marked as
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// literal, doesn't contain any literal data
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if (!T.isLiteral() || !T.getLiteralData())
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return llvm::None;
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StringRef ValueStr = StringRef(T.getLiteralData(), T.getLength());
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llvm::APInt IntValue;
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constexpr unsigned AutoSenseRadix = 0;
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if (ValueStr.getAsInteger(AutoSenseRadix, IntValue))
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return llvm::None;
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// Parse an optional minus sign.
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size_t Size = FilteredTokens.size();
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if (Size >= 2) {
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if (FilteredTokens[Size - 2].is(tok::minus))
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IntValue = -IntValue;
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}
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return IntValue.getSExtValue();
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}
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} // namespace ento
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} // namespace clang
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