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Call _initialize() automatically #1572

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merged 3 commits into from
Apr 18, 2020
Merged

Call _initialize() automatically #1572

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Call _initialize() automatically
erikzhang Apr 15, 2020
a84052c
Merge branch 'master' into contract-initialize
erikzhang Apr 15, 2020
9b576c7
Merge branch 'master' into contract-initialize
shargon Apr 17, 2020
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6 changes: 6 additions & 0 deletions src/neo/SmartContract/InteropService.Contract.cs
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Expand Up @@ -134,6 +134,8 @@ private static bool Contract_CallEx(ApplicationEngine engine)

private static bool Contract_CallEx(ApplicationEngine engine, UInt160 contractHash, string method, Array args, CallFlags flags)
{
if (method.StartsWith('_')) return false;
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ContractState contract = engine.Snapshot.Contracts.TryGet(contractHash);
if (contract is null) return false;

Expand Down Expand Up @@ -174,6 +176,10 @@ private static bool Contract_CallEx(ApplicationEngine engine, UInt160 contractHa
context_new.EvaluationStack.Push(args[i]);
context_new.InstructionPointer = md.Offset;
}

md = contract.Manifest.Abi.GetMethod("_initialize");
if (md != null) engine.LoadClonedContext(md.Offset);
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Should the eval stack of _initialize context be empty?

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Why?

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Both can influence each other, as we have already put the arguments on the eval stack.

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If one contract A invokes another contract B many times, every time we'll load the _initialize of B, it's not very efficient.

How about creating a .sdata(static data) segment in NEF file, where to put the static variables, when we load a contract, we can just pass the data into static slot.

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They are static variables, not constants.

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They are static variables, not constants.

It doesn't matter, the static variables will not be persisted, which will not affect the next time to load.

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I'm wondering whether the contract on the chain is stateful or stateless. If it is stateless, then we can call _initialize every time. If it is stateful, _initialize should only be called once.

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contract A{
  int a = 0;

  function inc(){
      return ++a
  }
}

If a contract is stateful, when call inc method, it'll increase the a.
If a contract is stateless, when call inc method, it'll only return 1 every time.

This will affect how the compiler treats the contract variables.


return true;
}

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