Clarify the use of `MRB_64BIT` and `MRB_INT64` in `dump.c` and `load.c`.

- `MRB_64BIT`: the size of a pointer is 64 bits
- `MRB_INT64`: the size of `mrb_int` is 64 bits

4 files changed, 15 insertions, 9 deletions

diff --git a/src/codedump.c b/src/codedump.c
index fd73f3104..0e90f22db 100644
--- a/src/codedump.c
+++ b/src/codedump.c
@@ -122,7 +122,7 @@ codedump(mrb_state *mrb, const mrb_irep *irep)
       case IREP_TT_INT32:
         printf("OP_LOADL\tR%d\tL(%d)\t; %" PRId32, a, b, irep->pool[b].u.i32);
         break;
-#ifdef MRB_INT64
+#ifdef MRB_64BIT
       case IREP_TT_INT64:
         printf("OP_LOADL\tR%d\tL(%d)\t; %" PRId64, a, b, irep->pool[b].u.i64);
         break;
diff --git a/src/dump.c b/src/dump.c
index c0c349d68..31dceb593 100644
--- a/src/dump.c
+++ b/src/dump.c
@@ -113,7 +113,7 @@ get_pool_block_size(mrb_state *mrb, const mrb_irep *irep)
 
     switch (irep->pool[pool_no].tt) {
     case IREP_TT_INT64:
-#ifdef MRB_INT64
+#ifdef MRB_64BIT
       {
         int64_t i = irep->pool[pool_no].u.i64;
 
@@ -169,7 +169,7 @@ write_pool_block(mrb_state *mrb, const mrb_irep *irep, uint8_t *buf)
     int ai = mrb_gc_arena_save(mrb);
 
     switch (irep->pool[pool_no].tt) {
-#ifdef MRB_INT64
+#ifdef MRB_64BIT
     case IREP_TT_INT64:
       {
         int64_t i = irep->pool[pool_no].u.i64;
@@ -938,7 +938,7 @@ dump_pool(mrb_state *mrb, const mrb_pool_value *p, FILE *fp)
     case IREP_TT_INT32:
       fprintf(fp, "{IREP_TT_INT32, {.i32=%"PRId32"}},\n", p->u.i32);
       break;
-#ifdef MRB_INT64
+#ifdef MRB_64BIT
     case IREP_TT_INT64:
       fprintf(fp, "{IREP_TT_INT64, {.i64=%"PRId64"}},\n", p->u.i64);
       break;
diff --git a/src/load.c b/src/load.c
index 31059e833..766aa0648 100644
--- a/src/load.c
+++ b/src/load.c
@@ -137,7 +137,7 @@ read_irep_record_1(mrb_state *mrb, const uint8_t *bin, size_t *len, uint8_t flag
         {
           mrb_int v = (int32_t)bin_to_uint32(src);
           src += sizeof(uint32_t);
-#ifdef MRB_INT64
+#ifdef MRB_64BIT
           pool[i].tt = IREP_TT_INT64;
           pool[i].u.i64 = (int64_t)v;
 #else
@@ -147,7 +147,7 @@ read_irep_record_1(mrb_state *mrb, const uint8_t *bin, size_t *len, uint8_t flag
         }
         break;
       case IREP_TT_INT64:
-#ifdef MRB_INT64
+#ifdef MRB_64BIT
         {
           uint64_t i = bin_to_uint32(src);
           src += sizeof(uint32_t);
@@ -156,10 +156,10 @@ read_irep_record_1(mrb_state *mrb, const uint8_t *bin, size_t *len, uint8_t flag
           src += sizeof(uint32_t);
           pool[i].u.i64 = (int64_t)i;
         }
+        break;
 #else
-        return NULL;            /* INT64 not supported on MRB_INT32 */
+        return NULL;            /* INT64 not supported on MRB_32BIT */
 #endif
-        break;
 
       case IREP_TT_FLOAT:
 #ifndef MRB_WITHOUT_FLOAT
diff --git a/src/vm.c b/src/vm.c
index 62805b7ed..98f17e287 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -1017,10 +1017,16 @@ RETRY_TRY_BLOCK:
       case IREP_TT_INT32:
         regs[a] = mrb_fixnum_value((mrb_int)pool[b].u.i32);
         break;
-#ifdef MRB_INT64
       case IREP_TT_INT64:
+#if defined(MRB_INT64) && defined(MRB_64BIT)
         regs[a] = mrb_fixnum_value((mrb_int)pool[b].u.i64);
         break;
+#else
+        {
+          mrb_value exc = mrb_exc_new_str_lit(mrb, E_RUNTIME_ERROR, "integer overflow");
+          mrb_exc_set(mrb, exc);
+        }
+        goto L_RAISE;
 #endif
 #ifndef MRB_WITHOUT_FLOAT
       case IREP_TT_FLOAT: