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#ifndef nsCycleCollector_h__
#define nsCycleCollector_h__

class nsISupports;
class nsDeque;
struct nsCycleCollectionTraversalCallback;

// An nsCycleCollectionLanguageRuntime is a per-language object that
// implements language-specific aspects of the cycle collection task.

struct nsCycleCollectionLanguageRuntime
{
    virtual nsresult BeginCycleCollection() = 0;

    virtual nsresult Traverse(void *p, nsCycleCollectionTraversalCallback &cb) = 0;

    virtual nsresult Root(const nsDeque &nodes) = 0;
    virtual nsresult Unlink(const nsDeque &nodes) = 0;
    virtual nsresult Unroot(const nsDeque &nodes) = 0;

    virtual nsresult FinishCycleCollection() = 0;
};


NS_COM PRBool nsCycleCollector_isScanSafe(nsISupports *n);
NS_COM void nsCycleCollector_suspect(nsISupports *n);
NS_COM void nsCycleCollector_forget(nsISupports *n);
NS_COM void nsCycleCollector_collect();
NS_COM void nsCycleCollector_shutdown();

// Helpers for interacting with language-identified scripts

NS_COM void nsCycleCollector_registerRuntime(PRUint32 langID, nsCycleCollectionLanguageRuntime *rt);
NS_COM void nsCycleCollector_forgetRuntime(PRUint32 langID);

#endif // nsCycleCollector_h__
