1//=== CXXSelfAssignmentChecker.cpp -----------------------------*- C++ -*--===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file defines CXXSelfAssignmentChecker, which tests all custom defined
11// copy and move assignment operators for the case of self assignment, thus
12// where the parameter refers to the same location where the this pointer
13// points to. The checker itself does not do any checks at all, but it
14// causes the analyzer to check every copy and move assignment operator twice:
15// once for when 'this' aliases with the parameter and once for when it may not.

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46 if (!MD->isCopyAssignmentOperator() && !MD->isMoveAssignmentOperator())
47 return;
48 auto &State = C.getState();
49 auto &SVB = C.getSValBuilder();
50 auto ThisVal =
51 State->getSVal(SVB.getCXXThis(MD, LCtx->getStackFrame()));
52 auto Param = SVB.makeLoc(State->getRegion(MD->getParamDecl(0), LCtx));
53 auto ParamVal = State->getSVal(Param);
54 ProgramStateRef SelfAssignState = State->bindLoc(Param, ThisVal, LCtx);
55 C.addTransition(SelfAssignState);
56 ProgramStateRef NonSelfAssignState = State->bindLoc(Param, ParamVal, LCtx);
57 C.addTransition(NonSelfAssignState);
58}
59
60void ento::registerCXXSelfAssignmentChecker(CheckerManager &Mgr) {
61 Mgr.registerChecker<CXXSelfAssignmentChecker>();
62}