implement FIP-0032 gas parameters and charges

fvm/src/call_manager/default.rs

@@ -15,7 +15,7 @@ use crate::gas::GasTracker;
 use crate::kernel::{ExecutionError, Kernel, Result, SyscallError};
 use crate::machine::Machine;
 use crate::syscalls::error::Abort;
-use crate::syscalls::{charge_for_exec, update_gas_available};
+use crate::syscalls::{apply_charges_on_syscall, update_gas_available};
 use crate::trace::{ExecutionEvent, ExecutionTrace, SendParams};
 use crate::{account_actor, syscall_error};
 
@@ -362,7 +362,7 @@ where
 
                 // Charge for any remaining uncharged execution gas, returning an error if we run
                 // out.
-                charge_for_exec(&mut store)?;
+                apply_charges_on_syscall(&mut store)?;
 
                 // If the invocation failed due to running out of exec_units, we have already detected it and returned OutOfGas above.
                 // Any other invocation failure is returned here as an Abort

fvm/src/gas/charge.rs

@@ -5,7 +5,9 @@
 /// as the amount of gas needed for computation and storage respectively.
 pub struct GasCharge<'a> {
     pub name: &'a str,
+    /// Compute costs in milligas.
     pub compute_gas: i64,
+    /// Storage costs in milligas.
     pub storage_gas: i64,
 }
 
@@ -18,7 +20,8 @@ impl<'a> GasCharge<'a> {
         }
     }
 
-    /// Calculates total gas charge based on compute and storage multipliers.
+    /// Calculates total gas charge (in milligas) based on compute and storage
+    /// multipliers.
     pub fn total(&self) -> i64 {
         self.compute_gas + self.storage_gas
     }

fvm/src/gas/mod.rs

@@ -48,11 +48,9 @@ impl GasTracker {
         }
     }
 
+    /// Applies the specified gas charge, where quantities are supplied in milligas.
     pub fn charge_gas(&mut self, charge: GasCharge) -> Result<()> {
-        self.charge_milligas(
-            charge.name,
-            charge.total().saturating_mul(MILLIGAS_PRECISION),
-        )
+        self.charge_milligas(charge.name, charge.total())
     }
 
     /// Getter for gas available.