Implement init and close for FluffyEvmRef.

fluffy/evm/evm.nim

@@ -0,0 +1,60 @@
+# Fluffy
+# Copyright (c) 2024 Status Research & Development GmbH
+# Licensed and distributed under either of
+#   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
+#   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
+# at your option. This file may not be copied, modified, or distributed except according to those terms.
+
+{.push raises: [].}
+
+import ../../nimbus/transaction/evmc_vm_glue
+
+when not defined(evmc_enabled):
+  {.
+    error:
+      "The Fluffy EVM requires evmc to be enabled. Compile with the -d:evmc_enabled flag."
+  .}
+
+type FluffyEvmRef* = ref object
+  vmPtr: ptr evmc_vm
+
+func init(T: type FluffyEvmRef): T =
+  FluffyEvmRef(vmPtr: evmc_create_nimbus_evm())
+
+func isClosed*(evm: FluffyEvmRef): bool =
+  evm.vmPtr.isNil()
+
+proc close(evm: FluffyEvmRef) =
+  if not evm.vmPtr.isNil():
+    evm.vmPtr.destroy(evm.vmPtr)
+    evm.vmPtr = nil
+
+#   desProc(vm)
+# proc create_evm*() =
+#   let vm = evmc_create_nimbus_evm()
+#   echo "vm.abi_version: ", vm.abi_version
+#   echo "vm.name: ", vm.name
+#   echo "vm.version: ", vm.version
+#   echo "vm.destroy: ", vm.destroy.isNil()
+#   echo "vm.execute: ", vm.execute.isNil()
+
+#   # let vm = (ref evmc_vm)(
+#   #   abi_version:      EVMC_ABI_VERSION,
+#   #   name:             evmcName,
+#   #   version:          evmcVersion,
+#   #   destroy:          evmcDestroy,
+#   #   execute:          evmcExecute,
+#   #   get_capabilities: evmcGetCapabilities,
+#   #   set_option:       evmcSetOption
+#   # )
+
+#   let desProc = vm.destroy
+#   desProc(vm)
+
+when isMainModule:
+  let evm = FluffyEvmRef.init()
+
+  echo evm.isClosed()
+  evm.close()
+  echo evm.isClosed()
+  evm.close()

fluffy/evm/evm.nim.cfg

@@ -0,0 +1,2 @@
+-d:
+  "evmc_enabled"

nimbus/transaction/evmc_vm_glue.nim

@@ -13,6 +13,8 @@ import
   ./host_types, evmc/evmc,
   ".."/[evm/types, evm/computation, evm/state_transactions]
 
+export evmc
+
 proc evmcReleaseResult(result: var evmc_result) {.cdecl.} =
   dealloc(result.output_data)
 
@@ -85,7 +87,7 @@ proc evmcSetOption(vm: ptr evmc_vm, name, value: cstring): evmc_set_option_resul
 proc evmcDestroy(vm: ptr evmc_vm) {.cdecl.} =
   GC_unref(cast[ref evmc_vm](vm))
 
-proc evmc_create_nimbus_evm(): ptr evmc_vm {.cdecl, exportc.} =
+proc evmc_create_nimbus_evm*(): ptr evmc_vm {.cdecl, exportc.} =
   ## Entry point to the Nimbus EVM, using an EVMC compatible interface.
   ## This is an exported C function.  EVMC specifies the function must
   ## have this name format when exported from a shared library.