In safecalloc, use the system calloc() for the non-DEBUGGING case, as

it may be able to memset() to 0 for free.

p4raw-id: //depot/perl@30652

diff --git a/util.c b/util.c
index 5a95d68..b6acab4 100644 (file)
--- a/util.c
+++ b/util.c
@@ -258,11 +258,16 @@ Perl_safesyscalloc(MEM_SIZE count, MEM_SIZE size)
 {
     dTHX;
     Malloc_t ptr;
+    const MEM_SIZE total_size = size * count
+#ifdef PERL_TRACK_MEMPOOL
+       + sTHX
+#endif
+       ;
 
 #ifdef HAS_64K_LIMIT
-    if (size * count > 0xffff) {
+    if (total_size > 0xffff) {
        PerlIO_printf(Perl_error_log,
-                     "Allocation too large: %lx\n", size * count) FLUSH;
+                     "Allocation too large: %lx\n", total_size) FLUSH;
        my_exit(1);
     }
 #endif /* HAS_64K_LIMIT */
@@ -270,20 +275,24 @@ Perl_safesyscalloc(MEM_SIZE count, MEM_SIZE size)
     if ((long)size < 0 || (long)count < 0)
        Perl_croak_nocontext("panic: calloc");
 #endif
-    size *= count;
 #ifdef PERL_TRACK_MEMPOOL
-    size += sTHX;
+    /* Have to use malloc() because we've added some space for our tracking
+       header.  */
+    ptr = (Malloc_t)PerlMem_malloc(total_size);
+#else
+    /* Use calloc() because it might save a memset() if the memory is fresh
+       and clean from the OS.  */
+    ptr = (Malloc_t)PerlMem_calloc(count, size);
 #endif
-    ptr = (Malloc_t)PerlMem_malloc(size?size:1);       /* malloc(0) is NASTY on our system */
     PERL_ALLOC_CHECK(ptr);
-    DEBUG_m(PerlIO_printf(Perl_debug_log, "0x%"UVxf": (%05ld) calloc %ld x %ld bytes\n",PTR2UV(ptr),(long)PL_an++,(long)count,(long)size));
+    DEBUG_m(PerlIO_printf(Perl_debug_log, "0x%"UVxf": (%05ld) calloc %ld x %ld bytes\n",PTR2UV(ptr),(long)PL_an++,(long)count,(long)total_size));
     if (ptr != NULL) {
-       memset((void*)ptr, 0, size);
 #ifdef PERL_TRACK_MEMPOOL
        {
            struct perl_memory_debug_header *const header
                = (struct perl_memory_debug_header *)ptr;
 
+           memset((void*)ptr, 0, total_size);
            header->interpreter = aTHX;
            /* Link us into the list.  */
            header->prev = &PL_memory_debug_header;
@@ -291,7 +300,7 @@ Perl_safesyscalloc(MEM_SIZE count, MEM_SIZE size)
            PL_memory_debug_header.next = header;
            header->next->prev = header;
 #  ifdef PERL_POISON
-           header->size = size;
+           header->size = total_size;
 #  endif
            ptr = (Malloc_t)((char*)ptr+sTHX);
        }