integrate evmc 'emitLog'

nimbus/vm/evmc_api.nim

@@ -91,9 +91,12 @@ proc selfdestruct*(ctx: HostContext, address, beneficiary: EthAddress) =
   {.gcsafe.}:
     ctx.host.selfdestruct(ctx.context, address.addr, beneficiary.addr)
 
-proc emitLog*(ctx: HostContext, address: EthAddress, data: openArray[byte], topics: openArray[evmc_bytes32]) =
+proc emitLog*(ctx: HostContext, address: EthAddress, data: openArray[byte],
+              topics: ptr evmc_bytes32, topicsCount: int) =
   var address = toEvmc(address)
-  ctx.host.emit_log(ctx.context, address.addr, data[0].unsafeAddr, data.len.uint, topics[0].unsafeAddr, topics.len.uint)
+  {.gcsafe.}:
+    ctx.host.emit_log(ctx.context, address.addr, if data.len > 0: data[0].unsafeAddr else: nil,
+                      data.len.uint, topics, topicsCount.uint)
 
 proc call*(ctx: HostContext, msg: evmc_message): evmc_result =
   ctx.host.call(ctx.context, msg.unsafeAddr)

nimbus/vm/evmc_host.nim

@@ -117,15 +117,18 @@ proc hostSelfdestructImpl(ctx: Computation, address, beneficiary: var evmc_addre
   ctx.registerAccountForDeletion(fromEvmc(beneficiary))
 
 proc hostEmitLogImpl(ctx: Computation, address: var evmc_address,
-                     data: ptr byte, dataSize: uint,
+                     data: ptr byte, dataSize: int,
-                     topics: UncheckedArray[evmc_bytes32], topicsCount: uint) {.cdecl.} =
+                     topics: UncheckedArray[evmc_bytes32], topicsCount: int) {.cdecl.} =
   var log: Log
+  if topicsCount > 0:
     log.topics = newSeq[Topic](topicsCount)
     for i in 0 ..< topicsCount:
       log.topics[i] = topics[i].bytes
 
+  if dataSize > 0:
     log.data = newSeq[byte](dataSize)
     copyMem(log.data[0].addr, data, dataSize)
+
   log.address = fromEvmc(address)
   ctx.addLogEntry(log)
 

nimbus/vm/interpreter/utils/macros_procs_opcodes.nim

@@ -13,7 +13,8 @@ import
   ../../computation, ../../stack, ../../code_stream,
   ../../../vm_types, ../../memory,
   ../../../errors, ../../message, ../../interpreter/[gas_meter, opcode_values],
-  ../../interpreter/utils/utils_numeric
+  ../../interpreter/utils/utils_numeric,
+  ../../evmc_api, evmc/evmc
 
 proc pop(tree: var NimNode): NimNode =
   ## Returns the last value of a NimNode and remove it
@@ -115,15 +116,25 @@ proc logImpl(c: Computation, opcode: Op, topicCount: int) =
   if memPos < 0 or len < 0:
     raise newException(OutOfBoundsRead, "Out of bounds memory access")
 
+  c.gasMeter.consumeGas(
+    c.gasCosts[opcode].m_handler(c.memory.len, memPos, len),
+    reason="Memory expansion, Log topic and data gas cost")
+  c.memory.extend(memPos, len)
+
+  when evmc_enabled:
+    var topics: array[4, evmc_bytes32]
+    for i in 0 ..< topicCount:
+      topics[i].bytes = c.stack.popTopic()
+
+    c.host.emitLog(c.msg.contractAddress,
+      c.memory.read(memPos, len),
+      topics[0].addr, topicCount)
+  else:
     var log: Log
     log.topics = newSeqOfCap[Topic](topicCount)
     for i in 0 ..< topicCount:
       log.topics.add(c.stack.popTopic())
-  c.gasMeter.consumeGas(
-    c.gasCosts[opcode].m_handler(c.memory.len, memPos, len),
-    reason="Memory expansion, Log topic and data gas cost")
 
-  c.memory.extend(memPos, len)
     log.data = c.memory.read(memPos, len)
     log.address = c.msg.contractAddress
     c.addLogEntry(log)