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Use references in DF iterators. This eliminates copy-ctor calls on huge objects (graphs)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45063 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov 2007-12-15 22:23:24 +00:00
parent 9e4635a5b8
commit ffe9e63c4a
2 changed files with 22 additions and 18 deletions
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36
include/llvm/ADT/DepthFirstIterator.h
View File

@ -96,16 +96,16 @@ public:
typedef df_iterator<GraphT, SetType, ExtStorage, GT> _Self;
// Provide static begin and end methods as our public "constructors"
static inline _Self begin(GraphT G) {
static inline _Self begin(const GraphT& G) {
return _Self(GT::getEntryNode(G));
}
static inline _Self end(GraphT G) { return _Self(); }
static inline _Self end(const GraphT& G) { return _Self(); }
// Static begin and end methods as our public ctors for external iterators
static inline _Self begin(GraphT G, SetType &S) {
static inline _Self begin(const GraphT& G, SetType &S) {
return _Self(GT::getEntryNode(G), S);
}
static inline _Self end(GraphT G, SetType &S) { return _Self(S); }
static inline _Self end(const GraphT& G, SetType &S) { return _Self(S); }
inline bool operator==(const _Self& x) const {
return VisitStack.size() == x.VisitStack.size() &&
@ -162,12 +162,12 @@ public:
// Provide global constructors that automatically figure out correct types...
//
template <class T>
df_iterator<T> df_begin(T G) {
df_iterator<T> df_begin(const T& G) {
return df_iterator<T>::begin(G);
}
template <class T>
df_iterator<T> df_end(T G) {
df_iterator<T> df_end(const T& G) {
return df_iterator<T>::end(G);
}
@ -179,12 +179,12 @@ struct df_ext_iterator : public df_iterator<T, SetTy, true> {
};
template <class T, class SetTy>
df_ext_iterator<T, SetTy> df_ext_begin(T G, SetTy &S) {
df_ext_iterator<T, SetTy> df_ext_begin(const T& G, SetTy &S) {
return df_ext_iterator<T, SetTy>::begin(G, S);
}
template <class T, class SetTy>
df_ext_iterator<T, SetTy> df_ext_end(T G, SetTy &S) {
df_ext_iterator<T, SetTy> df_ext_end(const T& G, SetTy &S) {
return df_ext_iterator<T, SetTy>::end(G, S);
}
@ -199,13 +199,15 @@ struct idf_iterator : public df_iterator<Inverse<T>, SetTy, External> {
};
template <class T>
idf_iterator<T> idf_begin(T G) {
return idf_iterator<T>::begin(G);
idf_iterator<T> idf_begin(const T& G) {
Inverse<T> DummyG;
return idf_iterator<T>::begin(DummyG);
}
template <class T>
idf_iterator<T> idf_end(T G){
return idf_iterator<T>::end(G);
idf_iterator<T> idf_end(const T& G){
Inverse<T> DummyG;
return idf_iterator<T>::end(DummyG);
}
// Provide global definitions of external inverse depth first iterators...
@ -218,13 +220,15 @@ struct idf_ext_iterator : public idf_iterator<T, SetTy, true> {
};
template <class T, class SetTy>
idf_ext_iterator<T, SetTy> idf_ext_begin(T G, SetTy &S) {
return idf_ext_iterator<T, SetTy>::begin(G, S);
idf_ext_iterator<T, SetTy> idf_ext_begin(const T& G, SetTy &S) {
Inverse<T> DummyG(G);
return idf_ext_iterator<T, SetTy>::begin(DummyG, S);
}
template <class T, class SetTy>
idf_ext_iterator<T, SetTy> idf_ext_end(T G, SetTy &S) {
return idf_ext_iterator<T, SetTy>::end(G, S);
idf_ext_iterator<T, SetTy> idf_ext_end(const T& G, SetTy &S) {
Inverse<T> DummyG(G);
return idf_ext_iterator<T, SetTy>::end(DummyG, S);
}
} // End llvm namespace

4
include/llvm/ADT/GraphTraits.h
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@ -73,9 +73,9 @@ struct GraphTraits {
//
template <class GraphType>
struct Inverse {
GraphType &Graph;
const GraphType &Graph;
inline Inverse(GraphType &G) : Graph(G) {}
inline Inverse(const GraphType &G) : Graph(G) {}
};
// Provide a partial specialization of GraphTraits so that the inverse of an inverse