fix(EVM): Do not charge additionally for EraVM decommit (#1086)

matter-labs · Dec 10, 2024 · b649f5f · b649f5f
1 parent ef91e52
commit b649f5f
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diff --git a/system-contracts/contracts/EvmEmulator.yul b/system-contracts/contracts/EvmEmulator.yul
@@ -185,9 +185,6 @@ object "EvmEmulator" {
 
         function OVERHEAD() -> overhead { overhead := 2000 }
 
-        // From precompiles/CodeOracle
-        function DECOMMIT_COST_PER_WORD() -> cost { cost := 4 }
-
         function UINT32_MAX() -> ret { ret := 4294967295 } // 2^32 - 1
 
         ////////////////////////////////////////////////////////////////
@@ -848,17 +845,6 @@ object "EvmEmulator" {
         // Call native ZkVm contract from EVM context
         function callZkVmNative(addr, evmGasToPass, value, argsOffset, argsSize, retOffset, retSize, isStatic) -> success, frameGasLeft {
             let zkEvmGasToPass := mul(evmGasToPass, GAS_DIVISOR()) // convert EVM gas -> ZkVM gas
-            let decommitZkVmGasCost := decommitmentCost(addr)
-
-            // we are going to charge decommit cost even if address is already warm
-            // decommit cost is subtracted from the callee frame
-            switch gt(decommitZkVmGasCost, zkEvmGasToPass)
-            case 0 {
-                zkEvmGasToPass := sub(zkEvmGasToPass, decommitZkVmGasCost)
-            }
-            default {
-                zkEvmGasToPass := 0
-            }
 
             if gt(zkEvmGasToPass, UINT32_MAX()) { // just in case
                 zkEvmGasToPass := UINT32_MAX()
@@ -886,15 +872,6 @@ object "EvmEmulator" {
             }
         }
 
-        function decommitmentCost(addr) -> cost {
-            // charge for contract decommitment
-            let byteSize := extcodesize(addr)
-            cost := mul(
-                div(add(byteSize, 31), 32), // rounding up
-                DECOMMIT_COST_PER_WORD()
-            ) 
-        }
-
         function capGasForCall(evmGasLeft, oldGasToPass) -> gasToPass {
             let maxGasToPass := sub(evmGasLeft, shr(6, evmGasLeft)) // evmGasLeft >> 6 == evmGasLeft/64
             gasToPass := oldGasToPass
@@ -3231,9 +3208,6 @@ object "EvmEmulator" {
 
             function OVERHEAD() -> overhead { overhead := 2000 }
 
-            // From precompiles/CodeOracle
-            function DECOMMIT_COST_PER_WORD() -> cost { cost := 4 }
-
             function UINT32_MAX() -> ret { ret := 4294967295 } // 2^32 - 1
 
             ////////////////////////////////////////////////////////////////
@@ -3894,17 +3868,6 @@ object "EvmEmulator" {
             // Call native ZkVm contract from EVM context
             function callZkVmNative(addr, evmGasToPass, value, argsOffset, argsSize, retOffset, retSize, isStatic) -> success, frameGasLeft {
                 let zkEvmGasToPass := mul(evmGasToPass, GAS_DIVISOR()) // convert EVM gas -> ZkVM gas
-                let decommitZkVmGasCost := decommitmentCost(addr)
-
-                // we are going to charge decommit cost even if address is already warm
-                // decommit cost is subtracted from the callee frame
-                switch gt(decommitZkVmGasCost, zkEvmGasToPass)
-                case 0 {
-                    zkEvmGasToPass := sub(zkEvmGasToPass, decommitZkVmGasCost)
-                }
-                default {
-                    zkEvmGasToPass := 0
-                }
 
                 if gt(zkEvmGasToPass, UINT32_MAX()) { // just in case
                     zkEvmGasToPass := UINT32_MAX()
@@ -3932,15 +3895,6 @@ object "EvmEmulator" {
                 }
             }
 
-            function decommitmentCost(addr) -> cost {
-                // charge for contract decommitment
-                let byteSize := extcodesize(addr)
-                cost := mul(
-                    div(add(byteSize, 31), 32), // rounding up
-                    DECOMMIT_COST_PER_WORD()
-                ) 
-            }
-
             function capGasForCall(evmGasLeft, oldGasToPass) -> gasToPass {
                 let maxGasToPass := sub(evmGasLeft, shr(6, evmGasLeft)) // evmGasLeft >> 6 == evmGasLeft/64
                 gasToPass := oldGasToPass

diff --git a/system-contracts/evm-emulator/EvmEmulatorFunctions.template.yul b/system-contracts/evm-emulator/EvmEmulatorFunctions.template.yul
@@ -123,9 +123,6 @@ function MSG_VALUE_SIMULATOR_STIPEND_GAS() -> gas_stipend {
 
 function OVERHEAD() -> overhead { overhead := 2000 }
 
-// From precompiles/CodeOracle
-function DECOMMIT_COST_PER_WORD() -> cost { cost := 4 }
-
 function UINT32_MAX() -> ret { ret := 4294967295 } // 2^32 - 1
 
 ////////////////////////////////////////////////////////////////
@@ -786,17 +783,6 @@ function callPrecompile(addr, precompileCost, gasToPass, value, argsOffset, args
 // Call native ZkVm contract from EVM context
 function callZkVmNative(addr, evmGasToPass, value, argsOffset, argsSize, retOffset, retSize, isStatic) -> success, frameGasLeft {
     let zkEvmGasToPass := mul(evmGasToPass, GAS_DIVISOR()) // convert EVM gas -> ZkVM gas
-    let decommitZkVmGasCost := decommitmentCost(addr)
-
-    // we are going to charge decommit cost even if address is already warm
-    // decommit cost is subtracted from the callee frame
-    switch gt(decommitZkVmGasCost, zkEvmGasToPass)
-    case 0 {
-        zkEvmGasToPass := sub(zkEvmGasToPass, decommitZkVmGasCost)
-    }
-    default {
-        zkEvmGasToPass := 0
-    }
 
     if gt(zkEvmGasToPass, UINT32_MAX()) { // just in case
         zkEvmGasToPass := UINT32_MAX()
@@ -824,15 +810,6 @@ function callZkVmNative(addr, evmGasToPass, value, argsOffset, argsSize, retOffs
     }
 }
 
-function decommitmentCost(addr) -> cost {
-    // charge for contract decommitment
-    let byteSize := extcodesize(addr)
-    cost := mul(
-        div(add(byteSize, 31), 32), // rounding up
-        DECOMMIT_COST_PER_WORD()
-    ) 
-}
-
 function capGasForCall(evmGasLeft, oldGasToPass) -> gasToPass {
     let maxGasToPass := sub(evmGasLeft, shr(6, evmGasLeft)) // evmGasLeft >> 6 == evmGasLeft/64
     gasToPass := oldGasToPass