updated circular dependency klugde

why:
  removing <when> clauses and replacing gas calculation by stubs
  makes up for better reading of the code

nimbus/vm2/interpreter/op_handlers/oph_arithmetic.nim

@@ -41,6 +41,8 @@ when not breakCircularDependency:
 else:
   import macros
 
+  var blindGasCosts: array[Op,int]
+
   # copied from stack.nim
   macro genTupleType(len: static[int], elemType: untyped): untyped =
     result = nnkTupleConstr.newNimNode()
@@ -53,11 +55,20 @@ else:
     var rc: genTupleType(n, UInt256)
     return rc
 
+  # function stubs from v2computation.nim (to satisfy compiler logic)
+  proc gasCosts(c: Computation): array[Op,int] = blindGasCosts
+
   # function stubs from v2utils_numeric.nim
   proc extractSign(v: var UInt256, sign: var bool) = discard
   proc setSign(v: var UInt256, sign: bool) =  discard
   func safeInt(x: Uint256): int = discard
 
+  # function stubs from gas_meter.nim
+  proc consumeGas(gasMeter: var GasMeter; amount: int; reason: string) = discard
+
+  # stubs from v2gas_costs.nim
+  proc d_handler(x: int; value: Uint256): int = 0
+
 # ------------------------------------------------------------------------------
 # Kludge END
 # ------------------------------------------------------------------------------
@@ -166,7 +177,6 @@ const
     ## 0x0A, Exponentiation
     let (base, exponent) = k.cpt.stack.popInt(2)
 
-    when not breakCircularDependency:
     k.cpt.gasMeter.consumeGas(
       k.cpt.gasCosts[Exp].d_handler(exponent),
       reason = "EXP: exponent bytes")

nimbus/vm2/interpreter/op_handlers/oph_envinfo.nim

@@ -41,6 +41,8 @@ when not breakCircularDependency:
 else:
   import macros
 
+  var blindGasCosts: array[Op,int]
+
   # copied from stack.nim
   macro genTupleType(len: static[int], elemType: untyped): untyped =
     result = nnkTupleConstr.newNimNode()
@@ -54,11 +56,12 @@ else:
     return rc
 
   # function stubs from v2computation.nim (to satisfy compiler logic)
+  proc gasCosts(c: Computation): array[Op,int] = blindGasCosts
   proc getBalance[T](c: Computation, address: T): Uint256 = 0.u256
-  proc getOrigin(c: Computation): Uint256 =  0.u256
-  proc getGasPrice(c: Computation): Uint256 =  0.u256
   proc getCodeSize[T](c: Computation, address: T): uint = 0
   proc getCode[T](c: Computation, address: T): seq[byte] = @[]
+  proc getGasPrice(c: Computation): Uint256 =  0.u256
+  proc getOrigin(c: Computation): Uint256 =  0.u256
 
   # function stubs from v2utils_numeric.nim
   func cleanMemRef(x: UInt256): int = 0
@@ -71,6 +74,12 @@ else:
   # function stubs from code_stream.nim
   proc len(c: CodeStream): int = len(c.bytes)
 
+  # function stubs from gas_meter.nim
+  proc consumeGas(gasMeter: var GasMeter; amount: int; reason: string) = discard
+
+  # stubs from v2gas_costs.nim
+  proc m_handler(x: int; curMemSize, memOffset, memLen: int64): int = 0
+
 # ------------------------------------------------------------------------------
 # Kludge END
 # ------------------------------------------------------------------------------
@@ -164,7 +173,6 @@ const
     let (memPos, copyPos, len) =
       (memStartPos.cleanMemRef, copyStartPos.cleanMemRef, size.cleanMemRef)
 
-    when not breakCircularDependency:
     k.cpt.gasMeter.consumeGas(
       k.cpt.gasCosts[CallDataCopy].m_handler(k.cpt.memory.len, memPos, len),
       reason = "CallDataCopy fee")
@@ -186,7 +194,6 @@ const
     let (memPos, copyPos, len) =
       (memStartPos.cleanMemRef, copyStartPos.cleanMemRef, size.cleanMemRef)
 
-    when not breakCircularDependency:
     k.cpt.gasMeter.consumeGas(
       k.cpt.gasCosts[CodeCopy].m_handler(k.cpt.memory.len, memPos, len),
       reason = "CodeCopy fee")
@@ -214,7 +221,6 @@ const
     let (memPos, codePos, len) =
       (memStartPos.cleanMemRef, codeStartPos.cleanMemRef, size.cleanMemRef)
 
-    when not breakCircularDependency:
     k.cpt.gasMeter.consumeGas(
       k.cpt.gasCosts[ExtCodeCopy].m_handler(k.cpt.memory.len, memPos, len),
       reason = "ExtCodeCopy fee")
@@ -237,7 +243,6 @@ const
     let (memPos, copyPos, len) =
       (memStartPos.cleanMemRef, copyStartPos.cleanMemRef, size.cleanMemRef)
 
-    when not breakCircularDependency:
     let gasCost = k.cpt.gasCosts[ReturnDataCopy].m_handler(
       k.cpt.memory.len, memPos, len)
     k.cpt.gasMeter.consumeGas(gasCost, reason = "returnDataCopy fee")

nimbus/vm2/interpreter/op_handlers/oph_hash.nim

@@ -40,6 +40,8 @@ when not breakCircularDependency:
 else:
   import macros
 
+  var blindGasCosts: array[Op,int]
+
   # copied from stack.nim
   macro genTupleType(len: static[int], elemType: untyped): untyped =
     result = nnkTupleConstr.newNimNode()
@@ -58,6 +60,12 @@ else:
   proc len(mem: Memory): int = 0
   proc extend(mem: var Memory; startPos: Natural; size: Natural) = discard
 
+  # function stubs from v2computation.nim (to satisfy compiler logic)
+  proc gasCosts(c: Computation): array[Op,int] = blindGasCosts
+
+  # function stubs from gas_meter.nim
+  proc consumeGas(gasMeter: var GasMeter; amount: int; reason: string) = discard
+
   # dummy stubs from constants
   const EMPTY_SHA3 = 0xdeadbeef.u256
 
@@ -65,6 +73,9 @@ else:
   const keccak256 = 0xfeedbeef
   proc digest(dummy: int64, data: openarray[byte]): UInt256 = EMPTY_SHA3
 
+  # stubs from v2gas_costs.nim
+  proc m_handler(x: int; curMemSize, memOffset, memLen: int64): int = 0
+
 # ------------------------------------------------------------------------------
 # Kludge END
 # ------------------------------------------------------------------------------
@@ -82,12 +93,12 @@ const
     if pos < 0 or len < 0 or pos > 2147483648'i64:
       raise newException(OutOfBoundsRead, "Out of bounds memory access")
 
-    when not breakCircularDependency:
     k.cpt.gasMeter.consumeGas(
       k.cpt.gasCosts[Op.Sha3].m_handler(k.cpt.memory.len, pos, len),
       reason = "SHA3: word gas cost")
 
     k.cpt.memory.extend(pos, len)
+
     let endRange = min(pos + len, k.cpt.memory.len) - 1
     if endRange == -1 or pos >= k.cpt.memory.len:
       k.cpt.stack.push(EMPTY_SHA3)