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85 lines
3.1 KiB
85 lines
3.1 KiB
4 months ago
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//=======- ASTUtis.h ---------------------------------------------*- 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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#ifndef LLVM_CLANG_ANALYZER_WEBKIT_ASTUTILS_H
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#define LLVM_CLANG_ANALYZER_WEBKIT_ASTUTILS_H
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#include "clang/AST/Decl.h"
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#include "llvm/ADT/APInt.h"
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#include "llvm/Support/Casting.h"
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#include <string>
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#include <utility>
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namespace clang {
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class CXXRecordDecl;
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class CXXBaseSpecifier;
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class FunctionDecl;
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class CXXMethodDecl;
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class Expr;
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/// This function de-facto defines a set of transformations that we consider
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/// safe (in heuristical sense). These transformation if passed a safe value as
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/// an input should provide a safe value (or an object that provides safe
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/// values).
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///
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/// For more context see Static Analyzer checkers documentation - specifically
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/// webkit.UncountedCallArgsChecker checker. Whitelist of transformations:
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/// - constructors of ref-counted types (including factory methods)
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/// - getters of ref-counted types
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/// - member overloaded operators
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/// - casts
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/// - unary operators like ``&`` or ``*``
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///
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/// If passed expression is of type uncounted pointer/reference we try to find
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/// the "origin" of the pointer value.
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/// Origin can be for example a local variable, nullptr, constant or
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/// this-pointer.
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///
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/// Certain subexpression nodes represent transformations that don't affect
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/// where the memory address originates from. We try to traverse such
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/// subexpressions to get to the relevant child nodes. Whenever we encounter a
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/// subexpression that either can't be ignored, we don't model its semantics or
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/// that has multiple children we stop.
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///
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/// \p E is an expression of uncounted pointer/reference type.
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/// If \p StopAtFirstRefCountedObj is true and we encounter a subexpression that
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/// represents ref-counted object during the traversal we return relevant
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/// sub-expression and true.
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///
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/// \returns subexpression that we traversed to and if \p
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/// StopAtFirstRefCountedObj is true we also return whether we stopped early.
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std::pair<const clang::Expr *, bool>
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tryToFindPtrOrigin(const clang::Expr *E, bool StopAtFirstRefCountedObj);
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/// For \p E referring to a ref-countable/-counted pointer/reference we return
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/// whether it's a safe call argument. Examples: function parameter or
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/// this-pointer. The logic relies on the set of recursive rules we enforce for
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/// WebKit codebase.
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///
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/// \returns Whether \p E is a safe call arugment.
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bool isASafeCallArg(const clang::Expr *E);
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/// \returns name of AST node or empty string.
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template <typename T> std::string safeGetName(const T *ASTNode) {
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const auto *const ND = llvm::dyn_cast_or_null<clang::NamedDecl>(ASTNode);
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if (!ND)
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return "";
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// In case F is for example "operator|" the getName() method below would
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// assert.
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if (!ND->getDeclName().isIdentifier())
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return "";
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return ND->getName().str();
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}
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} // namespace clang
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#endif
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