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-rw-r--r--core/fxcrt/include/cfx_count_ref.h9
1 files changed, 8 insertions, 1 deletions
diff --git a/core/fxcrt/include/cfx_count_ref.h b/core/fxcrt/include/cfx_count_ref.h
index d709efb67c..a879967b28 100644
--- a/core/fxcrt/include/cfx_count_ref.h
+++ b/core/fxcrt/include/cfx_count_ref.h
@@ -56,15 +56,22 @@ class CFX_CountRef {
CountedObj(Args... params) : ObjClass(params...), m_RefCount(0) {}
CountedObj(const CountedObj& src) : ObjClass(src), m_RefCount(0) {}
+ ~CountedObj() { m_RefCount = 0; }
bool HasOneRef() const { return m_RefCount == 1; }
void Retain() { m_RefCount++; }
void Release() {
- if (--m_RefCount <= 0)
+ ASSERT(m_RefCount);
+ if (--m_RefCount == 0)
delete this;
}
private:
+ // To ensure ref counts do not overflow, consider the worst possible case:
+ // the entire address space contains nothing but pointers to this object.
+ // Since the count increments with each new pointer, the largest value is
+ // the number of pointers that can fit into the address space. The size of
+ // the address space itself is a good upper bound on it.
intptr_t m_RefCount;
};