CodeQL library for C/C++

codeql/cpp-all 2.1.1-dev (changelog, source)

Module StackAddress

Provides utilities for determining which expressions contain stack addresses.

Import path

import semmle.code.cpp.dataflow.StackAddress

Imports

SSA	Provides classes and predicates for SSA representation (Static Single Assignment form).
cpp	Provides classes and predicates for working with C/C++ code.

Predicates

constructorMightRunOnStack	Helper predicate for memberFcnMightRunOnStack. Function calls to constructors need to be treated as a special case, because `call.getQualifier()` is empty. Instead, we need to check whether the constructor is called from an initializer. There are several kinds of initializers to consider.
isReferenceVariable	The type of the variable is a reference type, such as int&.
memberFcnMightRunOnStack	Holds if this member function might be called on an object which is allocated on the stack.
pointerParamFlowsToDef	Helper predicate for stackPointerFlowsToUse. Tracks the flow of stack addresses which arrived through one of the function’s parameters. This predicate is very similar to stackPointerFlowsToDef but they cannot be merged, because we cannot identify a sensible source expression here.
referenceParamFlowsToDef	Helper predicate for stackPointerFlowsToUse. Tracks the flow of stack addresses which arrived through one of the function’s parameters. This predicate is very similar to stackPointerFlowsToDef but they cannot be merged, because we cannot identify a sensible source expression here.
stackPointerFlowsToDef	Helper predicate for stackPointerFlowsToUse. Tracks the flow of stack addresses through SSA definitions.
stackPointerFlowsToUse	A stack address flows to `use`. The simplest case is when `use` is the expression `&var`, but assignments are also handled. For example:
stackReferenceFlowsToDef	Helper predicate for stackPointerFlowsToUse. Tracks the flow of stack references through SSA definitions. This predicate is almost identical to stackPointerFlowsToDef, except it handles references types, such as int&, rather than pointers.
stackReferenceFlowsToDef_Impl	stackReferenceFlowsToDef delegates most of the work to this predicate.
stackReferenceFlowsToUse	Holds if `use` has type `useType` and `source` is an access to a stack variable that flows to `use`. `isLocal` is `true` if `use` is accessed via a parameter, and `false` otherwise.