Upgrade smart contracts 2: delegatecall
Hicss
0x8466
January 18th, 2022

Delegatecall

delegatecall is a low level function similar to call.When contract A executes delegatecall to contract B, B's code is executed with contract A's storage, msg.sender and msg.value.

Common Call: When we call B's function from A, B's code is executed with contract B's storage. x in A is still 0.
Common Call: When we call B's function from A, B's code is executed with contract B's storage. x in A is still 0.
Delegatecall: When we call B's function from A, B's code is executed with contract A's storage. x in A will be 1.
Delegatecall: When we call B's function from A, B's code is executed with contract A's storage. x in A will be 1.

So we get a method to update the contract.

We can just change the address in A to call different contracts between B and B2 by using delegatecall.
We can just change the address in A to call different contracts between B and B2 by using delegatecall.

Example Code:

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