integrate evmc 'selfDestruct' and 'copyCode'

nimbus/vm/computation.nim

@@ -108,6 +108,18 @@ template getCodeHash*(c: Computation, address: EthAddress): Hash256 =
     else:
       db.getCodeHash(address)
 
+template selfDestruct*(c: Computation, address: EthAddress) =
+  when evmc_enabled:
+    c.host.selfDestruct(c.msg.contractAddress, address)
+  else:
+    c.registerAccountForDeletion(address)
+
+template getCode*(c: Computation, address: EthAddress): ByteRange =
+  when evmc_enabled:
+    c.host.copyCode(address).toRange
+  else:
+    c.vmState.readOnlyStateDB.getCode(address)
+
 proc newComputation*(vmState: BaseVMState, message: Message): Computation =
   new result
   result.vmState = vmState

nimbus/vm/evmc_api.nim

@@ -79,14 +79,17 @@ proc copyCode*(ctx: HostContext, address: EthAddress, codeOffset: int = 0): seq[
   var address = toEvmc(address)
   if size - codeOffset > 0:
     result = newSeq[byte](size - codeOffset)
-    let read = ctx.host.copy_code(ctx.context, address.addr, code_offset.uint, result[0].addr, result.len.uint).int
+    {.gcsafe.}:
+      let read = ctx.host.copy_code(ctx.context, address.addr,
+        code_offset.uint, result[0].addr, result.len.uint).int
     doAssert(read == result.len)
 
 proc selfdestruct*(ctx: HostContext, address, beneficiary: EthAddress) =
   var
     address = toEvmc(address)
     beneficiary = toEvmc(beneficiary)
-  ctx.host.selfdestruct(ctx.context, address.addr, beneficiary.addr)
+  {.gcsafe.}:
+    ctx.host.selfdestruct(ctx.context, address.addr, beneficiary.addr)
 
 proc emitLog*(ctx: HostContext, address: EthAddress, data: openArray[byte], topics: openArray[evmc_bytes32]) =
   var address = toEvmc(address)

nimbus/vm/interpreter/opcodes_impl.nim

@@ -310,7 +310,7 @@ op extCodeSize, inline = true:
 
 op extCodeCopy, inline = true:
   ## 0x3c, Copy an account's code to memory.
-  let account = c.stack.popAddress()
+  let address = c.stack.popAddress()
   let (memStartPos, codeStartPos, size) = c.stack.popInt(3)
   let (memPos, codePos, len) = (memStartPos.cleanMemRef, codeStartPos.cleanMemRef, size.cleanMemRef)
 
@@ -318,7 +318,7 @@ op extCodeCopy, inline = true:
     c.gasCosts[ExtCodeCopy].m_handler(c.memory.len, memPos, len),
     reason="ExtCodeCopy fee")
 
-  let codeBytes = c.vmState.readOnlyStateDB.getCode(account)
+  let codeBytes = c.getCode(address)
   c.memory.writePaddedResult(codeBytes.toOpenArray, memPos, codePos, len)
 
 op returnDataSize, inline = true:
@@ -734,7 +734,7 @@ template genCall(callName: untyped, opCode: Op): untyped =
 
     let
       callData = c.memory.read(memInPos, memInLen)
-      code = c.vmState.readOnlyStateDb.getCode(codeAddress)
+      code = c.getCode(codeAddress)
 
     var childMsg = Message(
       kind: callKind,
@@ -834,7 +834,7 @@ proc selfDestructImpl(c: Computation, beneficiary: EthAddress) =
     db.setBalance(c.msg.contractAddress, 0.u256)
 
     # Register the account to be deleted
-    c.registerAccountForDeletion(beneficiary)
+    c.selfDestruct(beneficiary)
 
     trace "SELFDESTRUCT",
       contractAddress = c.msg.contractAddress.toHex,