stage0 修复部分问题

stage0/spl_mcode.c

@@ -19,6 +19,7 @@ void spl_prog_init(spl_prog_t *prog) {
     vec_init(prog->natives);
     vec_init(prog->strtab);
     vec_init(prog->gdata);
+    vec_push(prog->gdata, (spl_vm_gdata_t){0});
     map_init(prog->symtab, MAP_HASH_STR, MAP_CMP_STR);
     prog->debug = NULL;
 }
@@ -296,7 +297,7 @@ int spl_prog_store_to_file(const char *fname, spl_prog_t *prog) {
     ninsns = vec_size(prog->insns);
     nnatives = vec_size(prog->natives);
     nstrs = vec_size(prog->strtab);
-    ndata = vec_size(prog->gdata);
+    ndata = vec_size(prog->gdata) - 1; /* jump 0 node */
 
     /* Calculate total size */
     total = 8                    /* magic */
@@ -325,7 +326,7 @@ int spl_prog_store_to_file(const char *fname, spl_prog_t *prog) {
     }
 
     /* gdata */
-    for (i = 0; i < ndata; i++) {
+    for (i = 1; i < vec_size(prog->gdata); i++) {
         usize dsize = vec_at(prog->gdata, i).size;
         total += 8 + ALIGN8(dsize); /* dsize + data(pad) */
     }
@@ -398,7 +399,7 @@ int spl_prog_store_to_file(const char *fname, spl_prog_t *prog) {
     }
 
     /* ---- global data ---- */
-    for (i = 0; i < ndata; i++) {
+    for (i = 1; i <= ndata; i++) {
         spl_vm_gdata_t *entry = &vec_at(prog->gdata, i);
         pad = ALIGN8(entry->size) - entry->size;
         wr64(&p, entry->size);
@@ -452,7 +453,7 @@ int spl_prog_add_data(spl_prog_t *prog, void *ptr, usize size) {
     memcpy(entry.data, ptr, size);
     entry.size = size;
     vec_push(prog->gdata, entry);
-    return vec_size(prog->gdata);
+    return (int)(vec_size(prog->gdata) - 1);
 }
 
 spl_vm_func_t *spl_prog_get_func(spl_prog_t *prog, const char *name) {
@@ -528,4 +529,4 @@ void spl_vm_ins_dump(spl_vm_ins_t *ins, spl_vm_val_t addr) {
         printf(" %s", spl_vm_type_kind_name((spl_vm_kind_t)ins->type));
     printf(" %zd:%zx", ins->imm, ins->imm);
     printf("\n");
-}
+}