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Add a new use_iterator::atEnd() method, which allows us to shrink

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pred_iterator down to a single ivar.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42859 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-10-11 04:18:11 +00:00
parent bdc2154986
commit 3ef437d137
2 changed files with 8 additions and 6 deletions
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11
include/llvm/Support/CFG.h
View File

@ -29,7 +29,6 @@ namespace llvm {
template <class _Ptr, class _USE_iterator> // Predecessor Iterator
class PredIterator : public forward_iterator<_Ptr, ptrdiff_t> {
typedef forward_iterator<_Ptr, ptrdiff_t> super;
_Ptr *BB;
_USE_iterator It;
public:
typedef PredIterator<_Ptr,_USE_iterator> _Self;
@ -37,26 +36,26 @@ public:
inline void advancePastNonTerminators() {
// Loop to ignore non terminator uses (for example PHI nodes)...
while (It != BB->use_end() && !isa<TerminatorInst>(*It))
while (!It.atEnd() && !isa<TerminatorInst>(*It))
++It;
}
inline PredIterator(_Ptr *bb) : BB(bb), It(bb->use_begin()) {
inline PredIterator(_Ptr *bb) : It(bb->use_begin()) {
advancePastNonTerminators();
}
inline PredIterator(_Ptr *bb, bool) : BB(bb), 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 pointer operator*() const {
assert(It != BB->use_end() && "pred_iterator out of range!");
assert(!It.atEnd() && "pred_iterator out of range!");
return cast<TerminatorInst>(*It)->getParent();
}
inline pointer *operator->() const { return &(operator*()); }
inline _Self& operator++() { // Preincrement
assert(It != BB->use_end() && "pred_iterator out of range!");
assert(!It.atEnd() && "pred_iterator out of range!");
++It; advancePastNonTerminators();
return *this;
}

3
include/llvm/Use.h
View File

@ -120,6 +120,9 @@ public:
bool operator!=(const _Self &x) const {
return !operator==(x);
}
/// atEnd - return true if this iterator is equal to use_end() on the value.
bool atEnd() const { return U == 0; }
// Iterator traversal: forward iteration only
_Self &operator++() { // Preincrement