clang 19.0.0git
TaggedUnionModeling.h
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1//===- TaggedUnionModeling.h -------------------------------------*- C++ -*-==//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef LLVM_CLANG_LIB_STATICANALYZER_CHECKERS_TAGGEDUNIONMODELING_H
10#define LLVM_CLANG_LIB_STATICANALYZER_CHECKERS_TAGGEDUNIONMODELING_H
11
18#include "llvm/ADT/FoldingSet.h"
19#include <numeric>
20
22
23// The implementation of all these functions can be found in the file
24// StdVariantChecker.cpp under the same directory as this file.
25
26bool isCopyConstructorCall(const CallEvent &Call);
27bool isCopyAssignmentCall(const CallEvent &Call);
28bool isMoveAssignmentCall(const CallEvent &Call);
29bool isMoveConstructorCall(const CallEvent &Call);
30bool isStdType(const Type *Type, const std::string &TypeName);
31bool isStdVariant(const Type *Type);
32
33// When invalidating regions, we also have to follow that by invalidating the
34// corresponding custom data in the program state.
35template <class TypeMap>
38 ProgramStateRef State,
40 // If we do not know anything about the call we shall not continue.
41 // If the call is happens within a system header it is implementation detail.
42 // We should not take it into consideration.
43 if (Call.isInSystemHeader())
44 return State;
45
46 for (const MemRegion *Region : Regions)
47 State = State->remove<TypeMap>(Region);
48
49 return State;
50}
51
52template <class TypeMap>
54 SVal ThisSVal) {
55 ProgramStateRef State = Call.getState();
56
57 if (!State)
58 return;
59
60 auto ArgSVal = Call.getArgSVal(0);
61 const auto *ThisRegion = ThisSVal.getAsRegion();
62 const auto *ArgMemRegion = ArgSVal.getAsRegion();
63
64 // Make changes to the state according to type of constructor/assignment
67 // First we handle copy and move operations
68 if (IsCopy || IsMove) {
69 const QualType *OtherQType = State->get<TypeMap>(ArgMemRegion);
70
71 // If the argument of a copy constructor or assignment is unknown then
72 // we will not know the argument of the copied to object.
73 if (!OtherQType) {
74 State = State->remove<TypeMap>(ThisRegion);
75 } else {
76 // When move semantics is used we can only know that the moved from
77 // object must be in a destructible state. Other usage of the object
78 // than destruction is undefined.
79 if (IsMove)
80 State = State->remove<TypeMap>(ArgMemRegion);
81
82 State = State->set<TypeMap>(ThisRegion, *OtherQType);
83 }
84 } else {
85 // Value constructor
86 auto ArgQType = ArgSVal.getType(C.getASTContext());
87 const Type *ArgTypePtr = ArgQType.getTypePtr();
88
89 QualType WoPointer = ArgTypePtr->getPointeeType();
90 State = State->set<TypeMap>(ThisRegion, WoPointer);
91 }
92
93 C.addTransition(State);
94}
95
96} // namespace clang::ento::tagged_union_modeling
97
98#endif // LLVM_CLANG_LIB_STATICANALYZER_CHECKERS_TAGGEDUNIONMODELING_H
A (possibly-)qualified type.
Definition: Type.h:942
The base class of the type hierarchy.
Definition: Type.h:1826
QualType getPointeeType() const
If this is a pointer, ObjC object pointer, or block pointer, this returns the respective pointee.
Definition: Type.cpp:705
Represents an abstract call to a function or method along a particular path.
Definition: CallEvent.h:153
MemRegion - The root abstract class for all memory regions.
Definition: MemRegion.h:97
SVal - This represents a symbolic expression, which can be either an L-value or an R-value.
Definition: SVals.h:55
const MemRegion * getAsRegion() const
Definition: SVals.cpp:120
ProgramStateRef removeInformationStoredForDeadInstances(const CallEvent &Call, ProgramStateRef State, ArrayRef< const MemRegion * > Regions)
bool isCopyAssignmentCall(const CallEvent &Call)
bool isStdType(const Type *Type, llvm::StringRef TypeName)
bool isMoveAssignmentCall(const CallEvent &Call)
bool isCopyConstructorCall(const CallEvent &Call)
void handleConstructorAndAssignment(const CallEvent &Call, CheckerContext &C, SVal ThisSVal)
bool isMoveConstructorCall(const CallEvent &Call)