[PATCH 3/6] wrap jhash calls to hash_loc

[Eric Wong <e@80x24.org>]

This will make it easier to keep a consistent hash seed
and/or switch to different hashes in the future.
---
 Mwrap.xs     | 4 ++--
 mwrap_core.h | 9 +++++++--
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/Mwrap.xs b/Mwrap.xs
index 8aeb425..a5ffeed 100644
--- a/Mwrap.xs
+++ b/Mwrap.xs
@@ -164,12 +164,12 @@ CODE:
 		k = (void *)kbuf;
 		memcpy(k->k, &p, sizeof(p));
 		k->capa = 0;
-		k->hval = jhash(k->k, sizeof(p), 0xdeadbeef);
+		hash_loc(k, sizeof(p));
 	} else {
 		k = (void *)kbuf;
 		memcpy(k->k, str, len + 1);
 		k->capa = len + 1;
-		k->hval = jhash(k->k, k->capa, 0xdeadbeef);
+		hash_loc(k, k->capa);
 	}
 
 	if (!k)
diff --git a/mwrap_core.h b/mwrap_core.h
index 94a6af3..d9396e6 100644
--- a/mwrap_core.h
+++ b/mwrap_core.h
@@ -272,6 +272,11 @@ static const COP *mwp_curcop(void)
 	return NULL;
 }
 
+static void hash_loc(struct src_loc *k, size_t len)
+{
+	k->hval = jhash(k->k, len, 0xdeadbeef);
+}
+
 static struct src_loc *assign_line(size_t size, const char *file, unsigned line)
 {
 	/* avoid vsnprintf or anything which could call malloc here: */
@@ -298,7 +303,7 @@ static struct src_loc *assign_line(size_t size, const char *file, unsigned line)
 	assert(dst && "bad math");
 	*dst = 0;	/* terminate string */
 	k->capa = (uint32_t)(dst - k->k + 1);
-	k->hval = jhash(k->k, k->capa, 0xdeadbeef);
+	hash_loc(k, k->capa);
 	return totals_add_rcu(k);
 }
 
@@ -325,7 +330,7 @@ update_stats_rcu_lock(size_t *generation, size_t size, uintptr_t caller)
 		k->total = size;
 		memcpy(k->k, &caller, xlen);
 		k->capa = 0;
-		k->hval = jhash(k->k, xlen, 0xdeadbeef);
+		hash_loc(k, xlen);
 		ret = totals_add_rcu(k);
 	}
 out: