Fixed setting gas limits in RUNVM (#1635)

Author: SpyCheese

crypto/vm/vm.cpp

@@ -729,6 +729,10 @@ void VmState::run_child_vm(VmState&& new_state, bool return_data, bool return_ac
   new_state.chksgn_counter = chksgn_counter;
   new_state.free_gas_consumed = free_gas_consumed;
   new_state.get_extra_balance_counter = get_extra_balance_counter;
+  if (global_version >= 10) {
+    new_state.gas = GasLimits{std::min(new_state.gas.gas_limit, gas.gas_remaining),
+                              std::min(new_state.gas.gas_max, gas.gas_remaining)};
+  }
 
   auto new_parent = std::make_unique<ParentVmState>();
   new_parent->return_data = return_data;

doc/GlobalVersions.md

@@ -188,6 +188,7 @@ Reserve modes `+1`, `+4` and `+8` ("reserve all except", "add original balance"
     - With "isolate gas" mode, in the beginning of `RUNVM` the parent VM spends full gas for all already executed `GETEXTRABALANCE` and resets the counter.
 - `LDMSGADDR(Q)`, `PARSEMSGADDR(Q)`, `REWRITESTDADDR(Q)`, `REWRITEVARADDR(Q)` no more support anycast addresses and `addr_var`.
 - Fixed bug in `RUNVM` caused by throwing out-of-gas exception with "isolate gas" enabled.
+- Fixed setting gas limits in `RUNVM` after consuming "free gas" (e.g. after `CHKSIGN` instructions).
 
 ### Other changes
 - Exceeding state limits in transaction now reverts `end_lt` back to `start_lt + 1` and collects action fines.