| //===---- CheckerHelpers.cpp - Helper functions for checkers ----*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file defines several static functions for use in checkers. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "clang/StaticAnalyzer/Core/PathSensitive/CheckerHelpers.h" |
| #include "clang/AST/Decl.h" |
| #include "clang/AST/Expr.h" |
| |
| // Recursively find any substatements containing macros |
| bool clang::ento::containsMacro(const Stmt *S) { |
| if (S->getLocStart().isMacroID()) |
| return true; |
| |
| if (S->getLocEnd().isMacroID()) |
| return true; |
| |
| for (const Stmt *Child : S->children()) |
| if (Child && containsMacro(Child)) |
| return true; |
| |
| return false; |
| } |
| |
| // Recursively find any substatements containing enum constants |
| bool clang::ento::containsEnum(const Stmt *S) { |
| const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(S); |
| |
| if (DR && isa<EnumConstantDecl>(DR->getDecl())) |
| return true; |
| |
| for (const Stmt *Child : S->children()) |
| if (Child && containsEnum(Child)) |
| return true; |
| |
| return false; |
| } |
| |
| // Recursively find any substatements containing static vars |
| bool clang::ento::containsStaticLocal(const Stmt *S) { |
| const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(S); |
| |
| if (DR) |
| if (const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl())) |
| if (VD->isStaticLocal()) |
| return true; |
| |
| for (const Stmt *Child : S->children()) |
| if (Child && containsStaticLocal(Child)) |
| return true; |
| |
| return false; |
| } |
| |
| // Recursively find any substatements containing __builtin_offsetof |
| bool clang::ento::containsBuiltinOffsetOf(const Stmt *S) { |
| if (isa<OffsetOfExpr>(S)) |
| return true; |
| |
| for (const Stmt *Child : S->children()) |
| if (Child && containsBuiltinOffsetOf(Child)) |
| return true; |
| |
| return false; |
| } |
| |
| // Extract lhs and rhs from assignment statement |
| std::pair<const clang::VarDecl *, const clang::Expr *> |
| clang::ento::parseAssignment(const Stmt *S) { |
| const VarDecl *VD = nullptr; |
| const Expr *RHS = nullptr; |
| |
| if (auto Assign = dyn_cast_or_null<BinaryOperator>(S)) { |
| if (Assign->isAssignmentOp()) { |
| // Ordinary assignment |
| RHS = Assign->getRHS(); |
| if (auto DE = dyn_cast_or_null<DeclRefExpr>(Assign->getLHS())) |
| VD = dyn_cast_or_null<VarDecl>(DE->getDecl()); |
| } |
| } else if (auto PD = dyn_cast_or_null<DeclStmt>(S)) { |
| // Initialization |
| assert(PD->isSingleDecl() && "We process decls one by one"); |
| VD = dyn_cast_or_null<VarDecl>(PD->getSingleDecl()); |
| RHS = VD->getAnyInitializer(); |
| } |
| |
| return std::make_pair(VD, RHS); |
| } |