Add shared hash key support

diff --git a/hv.h b/hv.h
index 4970363..a9de8ca 100644 (file)
--- a/hv.h
+++ b/hv.h
@@ -32,6 +32,23 @@ struct xpvhv {
     char       *xhv_name;      /* name, if a symbol table */
 };
 
+#define PERL_HASH(hash,str,len) \
+     STMT_START        { \
+       register char *s_PeRlHaSh = str; \
+       register I32 i_PeRlHaSh = len; \
+       register U32 hash_PeRlHaSh = 0; \
+       while (i_PeRlHaSh--) \
+           hash_PeRlHaSh = hash_PeRlHaSh * 33 + *s_PeRlHaSh++; \
+       (hash) = hash_PeRlHaSh; \
+    } STMT_END
+
+
+/* these hash entry flags ride on hent_klen */
+
+#define HEf_LAZYDEL    -1      /* entry must be deleted during next iter step */
+#define HEf_SVKEY      -2      /* hent_key is a SV* (only for magic/tied HVs) */
+
+
 #define Nullhv Null(HV*)
 #define HvARRAY(hv)    ((HE**)((XPVHV*)  SvANY(hv))->xhv_array)
 #define HvFILL(hv)     ((XPVHV*)  SvANY(hv))->xhv_fill
@@ -42,6 +59,10 @@ struct xpvhv {
 #define HvPMROOT(hv)   ((XPVHV*)  SvANY(hv))->xhv_pmroot
 #define HvNAME(hv)     ((XPVHV*)  SvANY(hv))->xhv_name
 
+#define HvSHAREKEYS(hv)                (SvFLAGS(hv) & SVphv_SHAREKEYS)
+#define HvSHAREKEYS_on(hv)     (SvFLAGS(hv) |= SVphv_SHAREKEYS)
+#define HvSHAREKEYS_off(hv)    (SvFLAGS(hv) &= ~SVphv_SHAREKEYS)
+
 #ifdef OVERLOAD
 
 /* Maybe amagical: */
@@ -58,3 +79,23 @@ struct xpvhv {
 */
 
 #endif /* OVERLOAD */
+
+#define Nullhe Null(HE*)
+#define HeNEXT(he)             (he)->hent_next
+#define HeKEY(he)              (he)->hent_key
+#define HeKLEN(he)             (he)->hent_klen
+#define HeVAL(he)              (he)->hent_val
+#define HeHASH(he)             (he)->hent_hash
+#define HePV(he)               ((he)->hent_klen == HEf_SVKEY) ?                \
+                               SvPV((SV*)((he)->hent_key),na) :                \
+                               (he)->hent_key))
+#define HeSVKEY(he)            (((he)->hent_key &&                             \
+                                 (he)->hent_klen == HEf_SVKEY) ?               \
+                                (SV*)((he)->hent_key) : Nullsv)
+
+#define HeSVKEY_force(he)      ((he)->hent_key ?                               \
+                                (((he)->hent_klen == HEf_SVKEY) ?              \
+                                 (SV*)((he)->hent_key) :                       \
+                                 sv_2mortal(newSVpv((he)->hent_key,            \
+                                                    (he)->hent_klen))) :       \
+                                &sv_undef)

diff --git a/sv.h b/sv.h
index c586de4..5b3a72a 100644 (file)
--- a/sv.h
+++ b/sv.h
@@ -129,6 +129,8 @@ struct io {
 #define SVpbm_CASEFOLD 0x40000000
 #define SVpbm_TAIL     0x20000000
 
+#define SVphv_SHAREKEYS 0x20000000     /* keys live on shared string table */
+
 #ifdef OVERLOAD
 #define SVpgv_AM        0x40000000
 /* #define SVpgv_badAM     0x20000000 */