ABICoderv1 and AST import cause storage difference due to function-type variable assignment

[Subway2023]

Description

14986 indicates that when --metadata-hash none is added, the generated bytecode should not change. However, function-type variable assignment will cause storage changes.

Environment

• Compiler version: 0.8.27
• Target EVM version (as per compiler settings): None
• Framework/IDE (e.g. Truffle or Remix): None
• EVM execution environment / backend / blockchain client: None
• Operating system: Linux

Steps to Reproduce

contract C {
    function() internal returns (uint) a;

    function g() public returns (uint256) {
        return 2;
    }

    function set() public returns (bytes4) {
        a=g;
    }
}

Get bin

Import from ast

solc C.sol --combined-json ast >> C.json
solc  --bin --import-ast C.json --metadata-hash none

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

With abicoder v1

add pragma abicoder v1; in program

solc --bin C.sol
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

Origin

solc --bin C.sol
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

Run in EVM

Import from ast

contractName,funcName,storage
C,set,{'0': '161'}

With abicoder v1

contractName,funcName,storage
C,set,{'0': '183'}

Origin

contractName,funcName,storage
C,set,{'0': '104'}