t8n tool support --state.reward -1

fixes #1313

tools/t8n/config.nim

@@ -1,10 +1,10 @@
 import
   std/[options, os, strutils],
-  confutils,
+  confutils, stint,
   ./types
 
 export
-  options
+  options, stint
 
 func combineForks(): string =
   for x in low(TestFork)..high(TestFork):
@@ -83,9 +83,10 @@ type
       name: "input.txs" }: string
 
     stateReward* {.
-      desc: "Mining reward. Set to 0 to disable"
+      desc: "Mining reward. Set to -1 to disable"
-      defaultValue: 0
+      defaultValue: none(UInt256)
-      name: "state.reward" }: HexOrInt
+      defaultValueDesc: "-1"
+      name: "state.reward" }: Option[UInt256]
 
     stateChainId* {.
       desc: "ChainID to use"
@@ -105,6 +106,17 @@ type
       defaultValue: 3
       name: "verbosity" }: int
 
+proc parseCmdArg*(T: type Option[UInt256], p: TaintedString): T =
+  if p.string == "-1":
+    none(UInt256)
+  elif startsWith(p.string, "0x"):
+    some(parse(p.string, UInt256, 16))
+  else:
+    some(parse(p.string, UInt256, 10))
+
+proc completeCmdArg*(T: type Option[UInt256], val: TaintedString): seq[string] =
+  return @[]
+
 proc parseCmdArg*(T: type HexOrInt, p: TaintedString): T =
   if startsWith(p.string, "0x"):
     parseHexInt(p.string).T
@@ -116,6 +128,13 @@ proc completeCmdArg*(T: type HexOrInt, val: TaintedString): seq[string] =
 
 proc notCmd(x: string): bool =
   if x.len == 0: return true
+
+  # negative number
+  if x.len >= 2 and
+    x[0] == '-' and
+    x[1].isDigit: return true
+
+  # else
   x[0] != '-'
 
 proc convertToNimStyle(cmds: openArray[string]): seq[string] =

tools/t8n/t8n_test.nim

@@ -286,6 +286,15 @@ const
       output: T8nOutput(alloc: false, result: false),
       expExitCode: ErrorConfig.int,
     ),
+    TestSpec(
+      name  : "Test state-reward -1",
+      base  : "testdata/3",
+      input : t8nInput(
+        "alloc.json", "txs.json", "env.json", "Berlin", "-1"
+      ),
+      output: T8nOutput(alloc: true, result: true),
+      expOut: "exp.json",
+    ),
   ]
 
 proc main() =

tools/t8n/transition.nim

@@ -128,7 +128,7 @@ proc dumpTrace(txIndex: int, txHash: Hash256, traceResult: JsonNode) =
 
 proc exec(ctx: var TransContext,
           vmState: BaseVMState,
-          blockReward: UInt256,
+          stateReward: Option[UInt256],
           header: BlockHeader): ExecOutput =
 
   var
@@ -174,7 +174,8 @@ proc exec(ctx: var TransContext,
     )
     includedTx.add tx
 
-  if blockReward > 0.u256:
+  if stateReward.isSome:
+    let blockReward = stateReward.get()
     var mainReward = blockReward
     for uncle in ctx.env.ommers:
       var uncleReward = 8.u256 - uncle.delta.u256
@@ -355,7 +356,7 @@ proc transitionAction*(ctx: var TransContext, conf: T8NConf) =
       db.setupAlloc(ctx.alloc)
       db.persist(clearCache = false)
 
-    let res = exec(ctx, vmState, conf.stateReward.uint64.u256, header)
+    let res = exec(ctx, vmState, conf.stateReward, header)
 
     if vmState.hashError.len > 0:
       raise newError(ErrorMissingBlockhash, vmState.hashError)