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      1 //===--- StmtIterator.cpp - Iterators for Statements ------------------------===//
      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 internal methods for StmtIterator.
     11 //
     12 //===----------------------------------------------------------------------===//
     13 
     14 #include "clang/AST/StmtIterator.h"
     15 #include "clang/AST/Decl.h"
     16 
     17 using namespace clang;
     18 
     19 // FIXME: Add support for dependent-sized array types in C++?
     20 // Does it even make sense to build a CFG for an uninstantiated template?
     21 static inline const VariableArrayType *FindVA(const Type* t) {
     22   while (const ArrayType *vt = dyn_cast<ArrayType>(t)) {
     23     if (const VariableArrayType *vat = dyn_cast<VariableArrayType>(vt))
     24       if (vat->getSizeExpr())
     25         return vat;
     26 
     27     t = vt->getElementType().getTypePtr();
     28   }
     29 
     30   return nullptr;
     31 }
     32 
     33 void StmtIteratorBase::NextVA() {
     34   assert (getVAPtr());
     35 
     36   const VariableArrayType *p = getVAPtr();
     37   p = FindVA(p->getElementType().getTypePtr());
     38   setVAPtr(p);
     39 
     40   if (p)
     41     return;
     42 
     43   if (inDeclGroup()) {
     44     if (VarDecl* VD = dyn_cast<VarDecl>(*DGI))
     45       if (VD->Init)
     46         return;
     47 
     48     NextDecl();
     49   }
     50   else {
     51     assert(inSizeOfTypeVA());
     52     RawVAPtr = 0;
     53   }
     54 }
     55 
     56 void StmtIteratorBase::NextDecl(bool ImmediateAdvance) {
     57   assert(getVAPtr() == nullptr);
     58   assert(inDeclGroup());
     59 
     60   if (ImmediateAdvance)
     61     ++DGI;
     62 
     63   for ( ; DGI != DGE; ++DGI)
     64     if (HandleDecl(*DGI))
     65       return;
     66 
     67   RawVAPtr = 0;
     68 }
     69 
     70 bool StmtIteratorBase::HandleDecl(Decl* D) {
     71   if (VarDecl* VD = dyn_cast<VarDecl>(D)) {
     72     if (const VariableArrayType* VAPtr = FindVA(VD->getType().getTypePtr())) {
     73       setVAPtr(VAPtr);
     74       return true;
     75     }
     76 
     77     if (VD->getInit())
     78       return true;
     79   }
     80   else if (TypedefNameDecl* TD = dyn_cast<TypedefNameDecl>(D)) {
     81     if (const VariableArrayType* VAPtr =
     82         FindVA(TD->getUnderlyingType().getTypePtr())) {
     83       setVAPtr(VAPtr);
     84       return true;
     85     }
     86   }
     87   else if (EnumConstantDecl* ECD = dyn_cast<EnumConstantDecl>(D)) {
     88     if (ECD->getInitExpr())
     89       return true;
     90   }
     91 
     92   return false;
     93 }
     94 
     95 StmtIteratorBase::StmtIteratorBase(Decl** dgi, Decl** dge)
     96   : DGI(dgi), RawVAPtr(DeclGroupMode), DGE(dge) {
     97   NextDecl(false);
     98 }
     99 
    100 StmtIteratorBase::StmtIteratorBase(const VariableArrayType* t)
    101   : DGI(nullptr), RawVAPtr(SizeOfTypeVAMode) {
    102   RawVAPtr |= reinterpret_cast<uintptr_t>(t);
    103 }
    104 
    105 Stmt*& StmtIteratorBase::GetDeclExpr() const {
    106   if (const VariableArrayType* VAPtr = getVAPtr()) {
    107     assert (VAPtr->SizeExpr);
    108     return const_cast<Stmt*&>(VAPtr->SizeExpr);
    109   }
    110 
    111   assert (inDeclGroup());
    112   VarDecl* VD = cast<VarDecl>(*DGI);
    113   return *VD->getInitAddress();
    114 }
    115