71 lines
2.9 KiB
Nim
71 lines
2.9 KiB
Nim
# Stint
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# Copyright 2018 Status Research & Development GmbH
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# Licensed under either of
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#
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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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#
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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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## This file provide optional syntactic sugar to work with operations on mixed precision integers (for example uint256 + uint)
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import ./int_public, ./uint_public, macros
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type Signedness = enum
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BothSigned, IntOnly, UintOnly
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macro make_mixed_types_ops(op: untyped, ResultTy: untyped, sign: static[Signedness], switchInputs: static[bool]): untyped =
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# ResultTy must be "InputType" or a real type like bool
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let isInputType = eqIdent(ResultTy, "InputType")
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result = newStmtList()
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if sign != IntOnly:
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let ResultTy = if not isInputType: ResultTy
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else: nnkBracketExpr.newTree(
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newIdentNode("StUint"),
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newIdentNode("bits")
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)
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result.add quote do:
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proc `op`*[bits: static[int]](a: Stuint[bits], b: SomeInteger): `ResultTy` {.inline.}=
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`op`(a, b.stuint(bits))
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if switchInputs:
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result.add quote do:
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proc `op`*[bits: static[int]](a: SomeInteger, b: Stuint[bits]): `ResultTy` {.inline.}=
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`op`(a.stuint(bits), b)
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if sign != UintOnly:
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let ResultTy = if not isInputType: ResultTy
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else: nnkBracketExpr.newTree(
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newIdentNode("StInt"),
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newIdentNode("bits")
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)
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result.add quote do:
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proc `op`*[bits: static[int]](a: Stint[bits], b: SomeInteger): `ResultTy` {.inline.}=
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`op`(a, b.stint(bits))
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if switchInputs:
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result.add quote do:
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proc `op`*[bits: static[int]](a: SomeInteger, b: Stint[bits]): `ResultTy` {.inline.}=
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`op`(a.stint(bits), b)
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make_mixed_types_ops(`+`, InputType, BothSigned, switchInputs = true)
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make_mixed_types_ops(`+=`, InputType, BothSigned, switchInputs = false)
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make_mixed_types_ops(`-`, InputType, BothSigned, switchInputs = true)
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make_mixed_types_ops(`-=`, InputType, BothSigned, switchInputs = false)
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make_mixed_types_ops(`*`, InputType, BothSigned, switchInputs = true)
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make_mixed_types_ops(`div`, InputType, BothSigned, switchInputs = false)
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make_mixed_types_ops(`mod`, InputType, BothSigned, switchInputs = false)
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make_mixed_types_ops(divmod, InputType, BothSigned, switchInputs = false)
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make_mixed_types_ops(`<`, bool, BothSigned, switchInputs = true)
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make_mixed_types_ops(`<=`, bool, BothSigned, switchInputs = true)
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make_mixed_types_ops(`==`, bool, BothSigned, switchInputs = true)
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make_mixed_types_ops(`or`, InputType, BothSigned, switchInputs = true)
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make_mixed_types_ops(`and`, InputType, BothSigned, switchInputs = true)
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make_mixed_types_ops(`xor`, InputType, BothSigned, switchInputs = true)
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