Make Cancun the default EVM version

[matheusaaguiar]

Closes #14905.

Old PR for Shanghai for reference: #14158.

[cameel]

Gas diff:

File name	IR optimized	Legacy optimized	Legacy
various/selfdestruct_post_cancun_redeploy.sol	14218%	13654%	15328%
various/selfdestruct_post_cancun_multiple_beneficiaries.sol
inlineAssembly/tstore_hidden_staticcall.sol
inlineAssembly/transient_storage_selfdestruct.sol
inlineAssembly/transient_storage_low_level_calls.sol
inlineAssembly/mcopy_as_identifier_pre_cancun.sol
inlineAssembly/blobhash_pre_cancun.sol
structs/copy_substructures_to_mapping.sol	-0%	-0%	-0%
structs/copy_substructures_from_mapping.sol	-0%	-0%	-0%
structs/copy_from_mapping.sol	-0%	-0%	-0%
structs/copy_to_mapping.sol	-0%	-0%	-0%
array/copying/function_type_array_to_storage.sol	-0%	-0%	-0%
various/skip_dynamic_types_for_structs.sol	-0%	-0%	-0%
array/pop/byte_array_pop_masking_long.sol	-0%	-0%	-0%
abiencodedecode/abi_decode_simple_storage.sol	-0%	-0%	-0%
abiEncoderV2/calldata_overlapped_dynamic_arrays.sol	-0%	-0%	-0%
array/copying/copy_byte_array_in_struct_to_storage.sol	-0%	-0%	-0%
array/copying/storage_memory_nested_bytes.sol	-0%	-0%	-0%
salted_create/prediction_example.sol			-1%
abiEncoderV2/storage_array_encoding.sol	-0%	-0%	-0%
array/copying/bytes_storage_to_storage.sol	-1%	-0%	-0%
externalContracts/strings.sol	-1%	-1%	-1%
abiEncoderV2/calldata_array.sol	-2%
abiEncoderV2/abi_encode_v2.sol	-1%	-1%	-1%
externalContracts/FixedFeeRegistrar.sol	-1%	-1%	-1%
functionCall/external_call_to_nonexisting_debugstrings.sol	-1%	-1%	-1%
byte_array_to_storage_cleanup.sol	-1%	-1%	-1%
externalContracts/base64.sol	-2%	-1%	-1%
functionCall/external_call_to_nonexisting.sol	-2%	-2%	-1%
externalContracts/deposit_contract.sol	-2%	-2%	-1%
constructor/bytes_in_constructors_packer.sol	-2%	-2%	-1%
constructor/bytes_in_constructors_unpacker.sol	-3%	-2%	-2%
various/address_code.sol	-4%	-3%	-2%
abiEncoderV2/abi_encode_calldata_slice.sol	-4%	-4%	-3%
abiEncoderV1/abi_encode_calldata_slice.sol	-4%	-4%	-3%
various/create_calldata.sol	-5%	-4%	-3%
various/selfdestruct_post_cancun.sol	-47%	-54%	-1%

[cameel]

Hmm... the code cost here seems surprisingly low. I'd expect the deployment cost to be the biggest factor here. Given 200 gas per byte, this means code size of 85 bytes, 150 bytes and 89 bytes, respectively. So I guess it's plausible. Maybe it's just the other cost that seems off. How is this function eating almost 100 million gas? It does not loop or do anything that heavy except for the contract deployment.

[matheusaaguiar]

I hadn't noticed that. I will try to check where exactly it is getting that high cost.

[cameel]

ok. This looks highly suspicious so it would be great if we knew what's happening and if something is broken.

But that's just in case. This is not a blocker for the PR itself. I think it's unlikely that it's caused by it and it's probably that we're just seeing the effects of something else here.

[ekpyron]

Note that 100000000 * 63 / 64 = 98437500

[cameel]

True! And 100000000 is the gas limit in our tests: https://github.com/ethereum/solidity/blob/cc79c91b93d322cd38beec08a1ce575d3622c7e4/test/ExecutionFramework.h#L275

So mystery solved. Looks like a failed staticcall just eats all gas forwarded to it. I did not consider that this might happen in cases other than hitting an invalid opcode. Or is it simply because state-mutating opcodes are considered invalid within a staticcall?

[ekpyron]

Yeah, it just hits an invalid opcode and thus eats up all gas forwarded to it. (The same should happen for an sstore)

[cameel]

Overall, the PR looks fine and the only blocker are the failing external tests.

[r0qs]

t_native_compile_ext_gp2 and t_native_test_ext_zeppelin are apparently using a old version of hardhat (since now we don't delete the package.json of those projects), so I guess we need to bump it to a version that supports the cancun hardfork option.

[cameel]

Note that this now contains the workaround from #14933 so they'll go in together and CI should pass.