starknet_os: os resources test - add replace_class

Author: dorimedini-starkware

crates/apollo_starknet_os_program/src/cairo/starkware/starknet/core/os/constants.cairo

@@ -114,7 +114,7 @@ const GET_BLOCK_HASH_GAS_COST = 10810;
 const GET_CLASS_HASH_AT_GAS_COST = 10000;
 const GET_EXECUTION_INFO_GAS_COST = 11240;
 const LIBRARY_CALL_GAS_COST = 88660;
-const REPLACE_CLASS_GAS_COST = 10670;
+const REPLACE_CLASS_GAS_COST = 10000;
 // TODO(Yoni, 1/1/2026): take into account Patricia updates and dict squash.
 const STORAGE_READ_GAS_COST = 24070;
 const STORAGE_WRITE_GAS_COST = 59970;

crates/apollo_starknet_os_program/src/program_hash.json

@@ -1,5 +1,5 @@
 {
-  "os": "0x643d546d56b7ff2fcf7a78062cc331fbfc5c53405741dd566c9f67cde6954da",
+  "os": "0x3ab760e55c8e6396b6b37f16076c9038ef6750bcebed93827b884194940fd53",
   "virtual_os": "0x66a46bb88553c4dafd12959575033660780d689c99659ab3620e2f524f71701",
   "aggregator": "0x700786d51b3854af43d8e12180380bda3029be6c1767e007858de6ca2edac40",
   "aggregator_with_prefix": "0xe08d300e3f5996e43d6d7cc5a20068e0e58cf1309089f2348317ac580f6c1f"

crates/blockifier/resources/blockifier_versioned_constants_0_14_4.json

@@ -377,7 +377,7 @@
                 }
             },
             "ReplaceClass": {
-                "n_steps": 106,
+                "n_steps": 92,
                 "n_memory_holes": 0,
                 "builtin_instance_counter": {
                     "range_check_builtin": 1

crates/blockifier_test_utils/resources/feature_contracts/cairo1/os_resources_test_contract.cairo

@@ -7,7 +7,7 @@ mod OsResourcesTestContract {
     use starknet::info::SyscallResultTrait;
     use starknet::syscalls::{
         call_contract_syscall, deploy_syscall, emit_event_syscall, get_execution_info_v2_syscall,
-        keccak_syscall, library_call_syscall, sha256_process_block_syscall,
+        keccak_syscall, library_call_syscall, replace_class_syscall, sha256_process_block_syscall,
     };
     use starknet::{ClassHash, ContractAddress, get_block_hash_syscall, get_class_hash_at_syscall};
 
@@ -118,6 +118,9 @@ mod OsResourcesTestContract {
         let mut input = BoxTrait::new([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]);
         let mut state = sha256_state_handle_init(BoxTrait::new(SHA256_INITIAL_STATE));
         let _ = sha256_process_block_syscall(state, input).unwrap_syscall();
+
+        // replace class syscall.
+        replace_class_syscall(self_class_hash).unwrap_syscall();
     }
 
     // Target for call_contract and library_call — accepts no arguments.

crates/starknet_os_flow_tests/src/os_resources_test.rs

@@ -45,7 +45,7 @@ use crate::tests::NON_TRIVIAL_RESOURCE_BOUNDS;
 use crate::utils::get_class_hash_of_feature_contract;
 
 // TODO(Dori): Delete this, or at least reduce it to a minimal set of unmeasurable syscalls.
-const UNMEASURABLE_SYSCALLS: [Selector; 25] = [
+const UNMEASURABLE_SYSCALLS: [Selector; 24] = [
     Selector::DelegateCall,
     Selector::DelegateL1Handler,
     Selector::GetBlockNumber,
@@ -57,7 +57,6 @@ const UNMEASURABLE_SYSCALLS: [Selector; 25] = [
     Selector::GetTxSignature,
     Selector::Sha512ProcessBlock,
     Selector::LibraryCallL1Handler,
-    Selector::ReplaceClass,
     Selector::Secp256k1Add,
     Selector::Secp256k1GetPointFromX,
     Selector::Secp256k1GetXy,