stage1 指针计算类型的错误修复 as运算符优先级的修改 ir2vm的bug修复

stage0/spl_vm.h

@@ -19,7 +19,7 @@ typedef struct {
 typedef VEC(spl_vm_val_t) spl_stack_vec_t;
 typedef VEC(spl_callframe_t) spl_frame_vec_t;
 
-typedef struct {
+typedef struct spl_vm {
     spl_stack_vec_t stacks;
     spl_frame_vec_t frames;
     uintptr_t gp; // global pointer
@@ -52,6 +52,8 @@ void spl_vm_init_ex(spl_vm_t *vm, int stack_size, int call_depth);
 /* Free dynamically allocated memory in VM */
 void spl_vm_drop(spl_vm_t *vm);
 
+int spl_vm_addr_valid(uintptr_t p, usize size);
+
 int spl_vm_load_prog(spl_vm_t *vm, spl_prog_t *prog);
 int spl_vm_prepare(spl_vm_t *vm, const char *entry, int argc, const char **argv, const char **envp);