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[RFC][DRAFT][VM] Function pointer support in VM #989
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runtian-zhou
requested review from
jolestar,
rahxephon89,
vgao1996,
wrwg,
chen-robert and
meng-xu-cs
runtian-zhou
commented
Mar 21, 2023
| let a: u64; | ||
| label b0: | ||
| func = get_function_pointer(M.sum); | ||
| a = call_function_pointer<|u64, u64| (u64)>(0, 1, move(func)); |
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Please refer to this example for how to use function pointer!
runtian-zhou
commented
Mar 21, 2023
| coin2 = BasicCoin1.mint<CoinType.Foo>(20); | ||
| interface = BasicCoin1.coin_interface<CoinType.Foo>(); | ||
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|
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| v = GenericAdder.add_coins<BasicCoin1.Coin<CoinType.Foo>>(&interface, &coin1, &coin2); |
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This is an example for how to implement interface with function pointer provided.
vgao1996
reviewed
Mar 22, 2023
| @@ -50,6 +50,7 @@ pub enum Type { | |||
| U16, | |||
| U32, | |||
| U256, | |||
| Function, | |||
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So I intentionally hided them because the runtime already carried the type information so there's no need to duplicate it.
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I feel like this may not be the right thing to do. Type is being used by native functions and should represent the full name of a type.
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Motivation
This is the very first initial draft of how MoveVM can potentially support function pointer. We believe function pointer could be a very important corner stone of how interface should be implemented in the future.
In this implemetnation, we add three new opcodes and one more SignatureToken type:
FunctionHandleinto a function pointer value on top of the stackFunctionInstantiationinto a function pointer value on top of the stackRight now it has the following limitations:
Have you read the Contributing Guidelines on pull requests?
Yes.
Test Plan
This implementation only passed compilation and is no way close to merging into main. The intention of this PR is just to assess the safety of this change and to collect usability feedbacks. I'll try to see how I can mod the IR to try the new feature out in the compiler