// BasicBlock pred_iterator definition
//===----------------------------------------------------------------------===//
-template <class _Ptr, class _USE_iterator> // Predecessor Iterator
+template <class Ptr, class USE_iterator> // Predecessor Iterator
class PredIterator : public std::iterator<std::forward_iterator_tag,
- _Ptr, ptrdiff_t> {
- typedef std::iterator<std::forward_iterator_tag, _Ptr, ptrdiff_t> super;
- _USE_iterator It;
-public:
- typedef PredIterator<_Ptr,_USE_iterator> _Self;
- typedef typename super::pointer pointer;
+ Ptr, ptrdiff_t> {
+ typedef std::iterator<std::forward_iterator_tag, Ptr, ptrdiff_t> super;
+ typedef PredIterator<Ptr, USE_iterator> Self;
+ USE_iterator It;
inline void advancePastNonTerminators() {
- // Loop to ignore non terminator uses (for example PHI nodes)...
+ // Loop to ignore non terminator uses (for example BlockAddresses).
while (!It.atEnd() && !isa<TerminatorInst>(*It))
++It;
}
- inline PredIterator(_Ptr *bb) : It(bb->use_begin()) {
+public:
+ typedef typename super::pointer pointer;
+
+ PredIterator() {}
+ explicit inline PredIterator(Ptr *bb) : It(bb->use_begin()) {
advancePastNonTerminators();
}
- inline PredIterator(_Ptr *bb, bool) : It(bb->use_end()) {}
+ inline PredIterator(Ptr *bb, bool) : It(bb->use_end()) {}
- inline bool operator==(const _Self& x) const { return It == x.It; }
- inline bool operator!=(const _Self& x) const { return !operator==(x); }
+ inline bool operator==(const Self& x) const { return It == x.It; }
+ inline bool operator!=(const Self& x) const { return !operator==(x); }
inline pointer operator*() const {
assert(!It.atEnd() && "pred_iterator out of range!");
return cast<TerminatorInst>(*It)->getParent();
}
- inline pointer *operator->() const { return &(operator*()); }
+ inline pointer *operator->() const { return &operator*(); }
- inline _Self& operator++() { // Preincrement
+ inline Self& operator++() { // Preincrement
assert(!It.atEnd() && "pred_iterator out of range!");
++It; advancePastNonTerminators();
return *this;
}
- inline _Self operator++(int) { // Postincrement
- _Self tmp = *this; ++*this; return tmp;
+ inline Self operator++(int) { // Postincrement
+ Self tmp = *this; ++*this; return tmp;
+ }
+
+ /// getOperandNo - Return the operand number in the predecessor's
+ /// terminator of the successor.
+ unsigned getOperandNo() const {
+ return It.getOperandNo();
}
};
typedef PredIterator<BasicBlock, Value::use_iterator> pred_iterator;
typedef PredIterator<const BasicBlock,
- Value::const_use_iterator> pred_const_iterator;
+ Value::const_use_iterator> const_pred_iterator;
inline pred_iterator pred_begin(BasicBlock *BB) { return pred_iterator(BB); }
-inline pred_const_iterator pred_begin(const BasicBlock *BB) {
- return pred_const_iterator(BB);
+inline const_pred_iterator pred_begin(const BasicBlock *BB) {
+ return const_pred_iterator(BB);
}
inline pred_iterator pred_end(BasicBlock *BB) { return pred_iterator(BB, true);}
-inline pred_const_iterator pred_end(const BasicBlock *BB) {
- return pred_const_iterator(BB, true);
+inline const_pred_iterator pred_end(const BasicBlock *BB) {
+ return const_pred_iterator(BB, true);
}
const Term_ Term;
unsigned idx;
typedef std::iterator<std::bidirectional_iterator_tag, BB_, ptrdiff_t> super;
+ typedef SuccIterator<Term_, BB_> Self;
+
+ inline bool index_is_valid(int idx) {
+ return idx >= 0 && (unsigned) idx < Term->getNumSuccessors();
+ }
+
public:
- typedef SuccIterator<Term_, BB_> _Self;
typedef typename super::pointer pointer;
// TODO: This can be random access iterator, only operator[] missing.
- inline SuccIterator(Term_ T) : Term(T), idx(0) { // begin iterator
- assert(T && "getTerminator returned null!");
+ explicit inline SuccIterator(Term_ T) : Term(T), idx(0) {// begin iterator
}
inline SuccIterator(Term_ T, bool) // end iterator
- : Term(T), idx(Term->getNumSuccessors()) {
- assert(T && "getTerminator returned null!");
- }
-
- inline const _Self &operator=(const _Self &I) {
+ : Term(T) {
+ if (Term)
+ idx = Term->getNumSuccessors();
+ else
+ // Term == NULL happens, if a basic block is not fully constructed and
+ // consequently getTerminator() returns NULL. In this case we construct a
+ // SuccIterator which describes a basic block that has zero successors.
+ // Defining SuccIterator for incomplete and malformed CFGs is especially
+ // useful for debugging.
+ idx = 0;
+ }
+
+ inline const Self &operator=(const Self &I) {
assert(Term == I.Term &&"Cannot assign iterators to two different blocks!");
idx = I.idx;
return *this;
}
- inline bool index_is_valid (int idx) {
- return idx >= 0 && (unsigned) idx < Term->getNumSuccessors();
- }
-
/// getSuccessorIndex - This is used to interface between code that wants to
/// operate on terminator instructions directly.
unsigned getSuccessorIndex() const { return idx; }
- inline bool operator==(const _Self& x) const { return idx == x.idx; }
- inline bool operator!=(const _Self& x) const { return !operator==(x); }
+ inline bool operator==(const Self& x) const { return idx == x.idx; }
+ inline bool operator!=(const Self& x) const { return !operator==(x); }
inline pointer operator*() const { return Term->getSuccessor(idx); }
inline pointer operator->() const { return operator*(); }
- inline _Self& operator++() { ++idx; return *this; } // Preincrement
+ inline Self& operator++() { ++idx; return *this; } // Preincrement
- inline _Self operator++(int) { // Postincrement
- _Self tmp = *this; ++*this; return tmp;
+ inline Self operator++(int) { // Postincrement
+ Self tmp = *this; ++*this; return tmp;
}
- inline _Self& operator--() { --idx; return *this; } // Predecrement
- inline _Self operator--(int) { // Postdecrement
- _Self tmp = *this; --*this; return tmp;
+ inline Self& operator--() { --idx; return *this; } // Predecrement
+ inline Self operator--(int) { // Postdecrement
+ Self tmp = *this; --*this; return tmp;
}
- inline bool operator<(const _Self& x) const {
+ inline bool operator<(const Self& x) const {
assert(Term == x.Term && "Cannot compare iterators of different blocks!");
return idx < x.idx;
}
- inline bool operator<=(const _Self& x) const {
+ inline bool operator<=(const Self& x) const {
assert(Term == x.Term && "Cannot compare iterators of different blocks!");
return idx <= x.idx;
}
- inline bool operator>=(const _Self& x) const {
+ inline bool operator>=(const Self& x) const {
assert(Term == x.Term && "Cannot compare iterators of different blocks!");
return idx >= x.idx;
}
- inline bool operator>(const _Self& x) const {
+ inline bool operator>(const Self& x) const {
assert(Term == x.Term && "Cannot compare iterators of different blocks!");
return idx > x.idx;
}
- inline _Self& operator+=(int Right) {
+ inline Self& operator+=(int Right) {
unsigned new_idx = idx + Right;
assert(index_is_valid(new_idx) && "Iterator index out of bound");
idx = new_idx;
return *this;
}
- inline _Self operator+(int Right) {
- _Self tmp = *this;
+ inline Self operator+(int Right) {
+ Self tmp = *this;
tmp += Right;
return tmp;
}
- inline _Self& operator-=(int Right) {
+ inline Self& operator-=(int Right) {
return operator+=(-Right);
}
- inline _Self operator-(int Right) {
+ inline Self operator-(int Right) {
return operator+(-Right);
}
- inline int operator-(const _Self& x) {
+ inline int operator-(const Self& x) {
assert(Term == x.Term && "Cannot work on iterators of different blocks!");
int distance = idx - x.idx;
return distance;
// be modified are not available.
//
// inline pointer operator[](int offset) {
- // _Self tmp = *this;
+ // Self tmp = *this;
// tmp += offset;
// return tmp.operator*();
// }
/// Get the source BB of this iterator.
inline BB_ *getSource() {
- return Term->getParent();
+ assert(Term && "Source not available, if basic block was malformed");
+ return Term->getParent();
}
};
template <> struct GraphTraits<Inverse<const BasicBlock*> > {
typedef const BasicBlock NodeType;
- typedef pred_const_iterator ChildIteratorType;
+ typedef const_pred_iterator ChildIteratorType;
static NodeType *getEntryNode(Inverse<const BasicBlock*> G) {
return G.Graph;
}
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