+/* ... Thread-safe hints ................................................... */
+
+#if I_WORKAROUND_REQUIRE_PROPAGATION
+
+typedef struct {
+ SV *code;
+ IV require_tag;
+} indirect_hint_t;
+
+#define I_HINT_STRUCT 1
+
+#define I_HINT_CODE(H) ((H)->code)
+
+#define I_HINT_FREE(H) { \
+ indirect_hint_t *h = (H); \
+ SvREFCNT_dec(h->code); \
+ PerlMemShared_free(h); \
+}
+
+#else /* I_WORKAROUND_REQUIRE_PROPAGATION */
+
+typedef SV indirect_hint_t;
+
+#define I_HINT_STRUCT 0
+
+#define I_HINT_CODE(H) (H)
+
+#define I_HINT_FREE(H) SvREFCNT_dec(H);
+
+#endif /* !I_WORKAROUND_REQUIRE_PROPAGATION */
+
+#if I_THREADSAFE
+
+#define PTABLE_NAME ptable_hints
+#define PTABLE_VAL_FREE(V) I_HINT_FREE(V)
+
+#define pPTBL pTHX
+#define pPTBL_ pTHX_
+#define aPTBL aTHX
+#define aPTBL_ aTHX_
+
+#include "ptable.h"
+
+#define ptable_hints_store(T, K, V) ptable_hints_store(aTHX_ (T), (K), (V))
+#define ptable_hints_free(T) ptable_hints_free(aTHX_ (T))
+
+#endif /* I_THREADSAFE */
+
+/* Define the op->str ptable here because we need to be able to clean it during
+ * thread cleanup. */
+
+typedef struct {
+ const char *pos;
+ char *buf;
+ STRLEN len, size;
+ line_t line;
+} indirect_op_info_t;