| //===- DynamicTypeMap.cpp - Dynamic Type Info related APIs ----------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file defines APIs that track and query dynamic type information. This |
| // information can be used to devirtualize calls during the symbolic execution |
| // or do type checking. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "clang/StaticAnalyzer/Core/PathSensitive/DynamicTypeMap.h" |
| #include "clang/Basic/LLVM.h" |
| #include "clang/StaticAnalyzer/Core/PathSensitive/MemRegion.h" |
| #include "clang/StaticAnalyzer/Core/PathSensitive/ProgramState.h" |
| #include "clang/StaticAnalyzer/Core/PathSensitive/SymExpr.h" |
| #include "llvm/Support/Casting.h" |
| #include "llvm/Support/raw_ostream.h" |
| #include <cassert> |
| |
| namespace clang { |
| namespace ento { |
| |
| DynamicTypeInfo getDynamicTypeInfo(ProgramStateRef State, |
| const MemRegion *Reg) { |
| Reg = Reg->StripCasts(); |
| |
| // Look up the dynamic type in the GDM. |
| const DynamicTypeInfo *GDMType = State->get<DynamicTypeMap>(Reg); |
| if (GDMType) |
| return *GDMType; |
| |
| // Otherwise, fall back to what we know about the region. |
| if (const auto *TR = dyn_cast<TypedRegion>(Reg)) |
| return DynamicTypeInfo(TR->getLocationType(), /*CanBeSubclass=*/false); |
| |
| if (const auto *SR = dyn_cast<SymbolicRegion>(Reg)) { |
| SymbolRef Sym = SR->getSymbol(); |
| return DynamicTypeInfo(Sym->getType()); |
| } |
| |
| return {}; |
| } |
| |
| ProgramStateRef setDynamicTypeInfo(ProgramStateRef State, const MemRegion *Reg, |
| DynamicTypeInfo NewTy) { |
| Reg = Reg->StripCasts(); |
| ProgramStateRef NewState = State->set<DynamicTypeMap>(Reg, NewTy); |
| assert(NewState); |
| return NewState; |
| } |
| |
| void printDynamicTypeInfo(ProgramStateRef State, raw_ostream &Out, |
| const char *NL, const char *Sep) { |
| bool First = true; |
| for (const auto &I : State->get<DynamicTypeMap>()) { |
| if (First) { |
| Out << NL << "Dynamic types of regions:" << NL; |
| First = false; |
| } |
| const MemRegion *MR = I.first; |
| const DynamicTypeInfo &DTI = I.second; |
| Out << MR << " : "; |
| if (DTI.isValid()) { |
| Out << DTI.getType()->getPointeeType().getAsString(); |
| if (DTI.canBeASubClass()) { |
| Out << " (or its subclass)"; |
| } |
| } else { |
| Out << "Invalid type info"; |
| } |
| Out << NL; |
| } |
| } |
| |
| } // namespace ento |
| } // namespace clang |