130 lines
4.4 KiB
Nim
130 lines
4.4 KiB
Nim
# Nimbus
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# Copyright (c) 2018 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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# ##################################################################
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# Macros to facilitate opcode procs creation
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import
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macros, strformat, stint, eth/common,
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../../computation, ../../stack, ../../code_stream,
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../../../constants, ../../../vm_types, ../../memory,
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../../../errors, ../../message, ../../interpreter/[gas_meter, opcode_values],
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../../interpreter/utils/utils_numeric
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proc pop(tree: var NimNode): NimNode =
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## Returns the last value of a NimNode and remove it
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result = tree[tree.len-1]
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tree.del(tree.len-1)
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macro op*(procname: untyped, inline: static[bool], stackParams_body: varargs[untyped]): untyped =
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## Usage:
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## .. code-block:: nim
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## op add, inline = true, lhs, rhs:
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## push:
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## lhs + rhs
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# TODO: Unfortunately due to varargs[untyped] consuming all following parameters,
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# we can't have a nicer macro signature `stackParams: varargs[untyped], body: untyped`
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# see https://github.com/nim-lang/Nim/issues/5855 and are forced to "pop"
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let computation = newIdentNode("computation")
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var stackParams = stackParams_body
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# 1. Separate stackParams and body with pop
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let body = newStmtList().add stackParams.pop
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# 3. let (x, y, z) = computation.stack.popInt(3)
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let len = stackParams.len
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var popStackStmt = nnkVarTuple.newTree()
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if len != 0:
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for params in stackParams:
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popStackStmt.add newIdentNode(params.ident)
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popStackStmt.add newEmptyNode()
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popStackStmt.add quote do:
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`computation`.stack.popInt(`len`)
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popStackStmt = nnkStmtList.newTree(
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nnkLetSection.newTree(popStackStmt)
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)
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else:
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popStackStmt = nnkDiscardStmt.newTree(newEmptyNode())
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# 4. Generate the proc
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# TODO: replace by func to ensure no side effects
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if inline:
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result = quote do:
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proc `procname`*(`computation`: BaseComputation) {.inline.} =
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`popStackStmt`
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`body`
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else:
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result = quote do:
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proc `procname`*(`computation`: BaseComputation) =
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`popStackStmt`
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`body`
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macro genPush*(): untyped =
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# TODO: avoid allocating a seq[byte], transforming to a string, stripping char
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func genName(size: int): NimNode = ident(&"push{size}")
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result = newStmtList()
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for size in 1 .. 32:
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let name = genName(size)
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result.add quote do:
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func `name`*(computation: BaseComputation) {.inline.}=
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## Push `size`-byte(s) on the stack
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computation.stack.push computation.code.readVmWord(`size`)
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macro genDup*(): untyped =
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func genName(position: int): NimNode = ident(&"dup{position}")
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result = newStmtList()
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for pos in 1 .. 16:
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let name = genName(pos)
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result.add quote do:
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func `name`*(computation: BaseComputation) {.inline.}=
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computation.stack.dup(`pos`)
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macro genSwap*(): untyped =
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func genName(position: int): NimNode = ident(&"swap{position}")
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result = newStmtList()
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for pos in 1 .. 16:
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let name = genName(pos)
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result.add quote do:
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func `name`*(computation: BaseComputation) {.inline.}=
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computation.stack.swap(`pos`)
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proc logImpl(c: BaseComputation, opcode: Op, topicCount: int) =
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doAssert(topicCount in 0 .. 4)
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let (memStartPosition, size) = c.stack.popInt(2)
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let (memPos, len) = (memStartPosition.cleanMemRef, size.cleanMemRef)
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if memPos < 0 or len < 0:
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raise newException(OutOfBoundsRead, "Out of bounds memory access")
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var log: Log
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log.topics = newSeqOfCap[Topic](topicCount)
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for i in 0 ..< topicCount:
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log.topics.add(c.stack.popTopic())
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c.gasMeter.consumeGas(
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c.gasCosts[opcode].m_handler(c.memory.len, memPos, len),
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reason="Memory expansion, Log topic and data gas cost")
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c.memory.extend(memPos, len)
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log.data = c.memory.read(memPos, len)
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log.address = c.msg.storageAddress
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c.addLogEntry(log)
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template genLog*() =
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proc log0*(c: BaseComputation) {.inline.} = logImpl(c, Log0, 0)
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proc log1*(c: BaseComputation) {.inline.} = logImpl(c, Log1, 1)
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proc log2*(c: BaseComputation) {.inline.} = logImpl(c, Log2, 2)
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proc log3*(c: BaseComputation) {.inline.} = logImpl(c, Log3, 3)
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proc log4*(c: BaseComputation) {.inline.} = logImpl(c, Log4, 4)
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