feat: support snapshot and revert syscalls

c/generator_utils.h

@@ -39,6 +39,9 @@
 #define GW_SYS_BN_ADD 3601
 #define GW_SYS_BN_MUL 3602
 #define GW_SYS_BN_PAIRING 3603
+/* Syscall state */
+#define GW_SYS_SNAPSHOT 3701
+#define GW_SYS_REVERT 3702
 
 typedef struct gw_context_t {
   /* verification context */
@@ -70,6 +73,8 @@ typedef struct gw_context_t {
       sys_get_registry_address_by_script_hash;
   gw_get_script_hash_by_registry_address_fn
       sys_get_script_hash_by_registry_address;
+  gw_snapshot_fn sys_snapshot;
+  gw_revert_fn sys_revert;
   _gw_load_raw_fn _internal_load_raw;
   _gw_store_raw_fn _internal_store_raw;
 } gw_context_t;
@@ -405,6 +410,22 @@ int sys_pay_fee(gw_context_t *ctx, gw_reg_addr_t addr, uint32_t sudt_id,
   return syscall(GW_SYS_PAY_FEE, buf, len, sudt_id, (uint8_t *)&amount, 0, 0);
 }
 
+int sys_snapshot(gw_context_t *ctx, uint32_t *snapshot) {
+  if (ctx == NULL) {
+    return GW_FATAL_INVALID_CONTEXT;
+  }
+
+  return syscall(GW_SYS_SNAPSHOT, snapshot, 0, 0, 0, 0, 0);
+}
+
+int sys_revert(gw_context_t *ctx, uint32_t snapshot) {
+  if (ctx == NULL) {
+    return GW_FATAL_INVALID_CONTEXT;
+  }
+
+  return syscall(GW_SYS_REVERT, snapshot, 0, 0, 0, 0, 0);
+}
+
 int _sys_load_rollup_config(uint8_t *addr, uint64_t *len) {
   volatile uint64_t inner_len = *len;
   int ret = syscall(GW_SYS_LOAD_ROLLUP_CONFIG, addr, &inner_len, 0, 0, 0, 0);
@@ -448,6 +469,8 @@ int gw_context_init(gw_context_t *ctx) {
       _gw_get_registry_address_by_script_hash;
   ctx->sys_get_script_hash_by_registry_address =
       _gw_get_script_hash_by_registry_address;
+  ctx->sys_snapshot = sys_snapshot;
+  ctx->sys_revert = sys_revert;
   ctx->_internal_load_raw = _internal_load_raw;
   ctx->_internal_store_raw = _internal_store_raw;
 

c/gw_def.h

@@ -315,6 +315,24 @@ typedef int (*gw_get_registry_address_by_script_hash_fn)(
 typedef int (*gw_get_script_hash_by_registry_address_fn)(
     struct gw_context_t *ctx, gw_reg_addr_t *address, uint8_t script_hash[32]);
 
+/**
+ * Create snapshot of state
+ *
+ * @param ctx        The godwoken context
+ * @param snapshot_id The pointer of the snapshot id to save the result
+ * @return           The status code, 0 is success
+ */
+typedef int (*gw_snapshot_fn)(struct gw_context_t *ctx, uint32_t *snapshot_id);
+
+/**
+ * Revert state
+ *
+ * @param ctx        The godwoken context
+ * @param snapshot_id The snapshot id
+ * @return           The status code, 0 is success
+ */
+typedef int (*gw_revert_fn)(struct gw_context_t *ctx, uint32_t snapshot_id);
+
 /**
  * Load value by raw key from state tree
  *

c/validator_utils.h

@@ -78,6 +78,8 @@ typedef struct gw_context_t {
       sys_get_registry_address_by_script_hash;
   gw_get_script_hash_by_registry_address_fn
       sys_get_script_hash_by_registry_address;
+  gw_snapshot_fn sys_snapshot;
+  gw_revert_fn sys_revert;
   _gw_load_raw_fn _internal_load_raw;
   _gw_store_raw_fn _internal_store_raw;
 
@@ -690,6 +692,14 @@ int sys_pay_fee(gw_context_t *ctx, gw_reg_addr_t payer_addr, uint32_t sudt_id,
   return 0;
 }
 
+int sys_snapshot(gw_context_t *ctx, uint32_t *snapshot) {
+  return GW_UNIMPLEMENTED;
+}
+
+int sys_revert(gw_context_t *ctx, uint32_t snapshot) {
+  return GW_UNIMPLEMENTED;
+}
+
 /* Find cell by type hash */
 int _find_cell_by_type_hash(uint8_t type_hash[32], uint64_t source,
                             uint64_t *index) {
@@ -1623,6 +1633,8 @@ int gw_context_init(gw_context_t *ctx) {
       _gw_get_registry_address_by_script_hash;
   ctx->sys_get_script_hash_by_registry_address =
       _gw_get_script_hash_by_registry_address;
+  ctx->sys_snapshot = sys_snapshot;
+  ctx->sys_revert = sys_revert;
   ctx->_internal_load_raw = _internal_load_raw;
   ctx->_internal_store_raw = _internal_store_raw;