EVM opcode: CALLGAS

[axic]

This is split out of #28.

Motivation

To allow contracts calculate the gas used effectively.

Specification

A new opcode, TXGAS CALLGAS is introduced at 0x3d. It returns the initial gas allocation for the call. It can be used together with GAS (0x5a) to calculate the gas used.

Note: this is different to #28 where the opcode 0x5c was suggested.

[chfast]

If this is about current call, I'd name it MSGGAS.

How is it better than storing the gas to the memory at the very beginning?

[axic]

True! I think CALLGAS might be better fitting as we have CALLVALUE as well.

[lastperson]

This will only solve part of the issue. We also need CALLREFUND counter that will tell how much gas is gathered for refund (storage cleaning) at this point of time.

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