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Provide a specialization of _Alloc_traits, which allows the G++ runtime to avoid

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storing an instance of the allocator in each data structure it uses.  Yaay.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9795 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2003-11-07 23:20:56 +00:00
parent c1a2be18ea
commit 94db57024f
2 changed files with 26 additions and 4 deletions
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15
include/Support/MallocAllocator.h
View File

@ -44,11 +44,11 @@ struct MallocAllocator {
const_pointer address(const_reference x) const { return &x; } const_pointer address(const_reference x) const { return &x; }
size_type max_size() const { return ~0 / sizeof(T); } size_type max_size() const { return ~0 / sizeof(T); }
pointer allocate(size_t n, void* hint = 0) { static pointer allocate(size_t n, void* hint = 0) {
return (pointer)malloc(n*sizeof(T)); return (pointer)malloc(n*sizeof(T));
} }
void deallocate(pointer p, size_t n) { static void deallocate(pointer p, size_t n) {
free((void*)p); free((void*)p);
} }
@ -69,4 +69,15 @@ inline bool operator!=(const MallocAllocator<T>&, const MallocAllocator<T>&) {
return false; return false;
} }
namespace std {
template<typename Type, typename Type2>
struct _Alloc_traits<Type, ::MallocAllocator<Type2> > {
static const bool _S_instanceless = true;
typedef ::MallocAllocator<Type> base_alloc_type;
typedef ::MallocAllocator<Type> _Alloc_type;
typedef ::MallocAllocator<Type> allocator_type;
};
}
#endif #endif

15
include/llvm/Support/MallocAllocator.h
View File

@ -44,11 +44,11 @@ struct MallocAllocator {
const_pointer address(const_reference x) const { return &x; } const_pointer address(const_reference x) const { return &x; }
size_type max_size() const { return ~0 / sizeof(T); } size_type max_size() const { return ~0 / sizeof(T); }
pointer allocate(size_t n, void* hint = 0) { static pointer allocate(size_t n, void* hint = 0) {
return (pointer)malloc(n*sizeof(T)); return (pointer)malloc(n*sizeof(T));
} }
void deallocate(pointer p, size_t n) { static void deallocate(pointer p, size_t n) {
free((void*)p); free((void*)p);
} }
@ -69,4 +69,15 @@ inline bool operator!=(const MallocAllocator<T>&, const MallocAllocator<T>&) {
return false; return false;
} }
namespace std {
template<typename Type, typename Type2>
struct _Alloc_traits<Type, ::MallocAllocator<Type2> > {
static const bool _S_instanceless = true;
typedef ::MallocAllocator<Type> base_alloc_type;
typedef ::MallocAllocator<Type> _Alloc_type;
typedef ::MallocAllocator<Type> allocator_type;
};
}
#endif #endif