rb_iseq_t: reduce to (280 bytes from 288 bytes) on 64-bit

iseq_size and line_info_size may be 32-bit.

4GB instruction sequences should be big enough for anyone.
Other existing line info counters are 32-bit, and nobody
should need all that.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46957 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Sat Jul 26 16:28:06 2014  Eric Wong  <e@80x24.org>
+
+	* vm_core.h (struct rb_iseq_struct): reduce to 280 bytes
+	  (from 288 bytes) on 64-bit
+
 Sat Jul 26 06:44:43 2014  Eric Wong  <e@80x24.org>
 
 	* parse.y (struct parse_params): shrink to 320 to 304 bytes on 64-bit

compile.c

@@ -567,7 +567,7 @@ rb_iseq_translate_threaded_code(rb_iseq_t *iseq)
 {
 #if OPT_DIRECT_THREADED_CODE || OPT_CALL_THREADED_CODE
     const void * const *table = rb_vm_get_insns_address_table();
-    unsigned long i;
+    unsigned int i;
 
     iseq->iseq_encoded = ALLOC_N(VALUE, iseq->iseq_size);
     MEMCPY(iseq->iseq_encoded, iseq->iseq, VALUE, iseq->iseq_size);

iseq.c

@@ -1379,7 +1379,7 @@ rb_iseq_disasm(VALUE self)
     VALUE *iseq;
     VALUE str = rb_str_new(0, 0);
     VALUE child = rb_ary_new();
-    unsigned long size;
+    unsigned int size;
     int i;
     long l;
     ID *tbl;
@@ -2144,7 +2144,8 @@ int
 rb_iseq_line_trace_each(VALUE iseqval, int (*func)(int line, rb_event_flag_t *events_ptr, void *d), void *data)
 {
     int trace_num = 0;
-    size_t pos, insn;
+    unsigned int pos;
+    size_t insn;
     rb_iseq_t *iseq;
     int cont = 1;
     GetISeqPtr(iseqval, iseq);

vm_core.h

@@ -214,13 +214,14 @@ struct rb_iseq_struct {
 
     VALUE *iseq;         /* iseq (insn number and operands) */
     VALUE *iseq_encoded; /* encoded iseq */
-    unsigned long iseq_size;
+    unsigned int iseq_size;
+    unsigned int line_info_size;
+
     const VALUE mark_ary;     /* Array: includes operands which should be GC marked */
     const VALUE coverage;     /* coverage array */
 
     /* insn info, must be freed */
     struct iseq_line_info_entry *line_info_table;
-    size_t line_info_size;
 
     ID *local_table;		/* must free */
     int local_table_size;