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Layout of Call Data

docs/internals/layout_in_calldata.rst

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.. index: calldata layout

Layout of Call Data

The input data for a function call is assumed to be in the format defined by the :ref:ABI specification <ABI>. Among others, the ABI specification requires arguments to be padded to multiples of 32 bytes. The internal function calls use a different convention.

Arguments for the constructor of a contract are directly appended at the end of the contract's code, also in ABI encoding. The constructor will access them through a hard-coded offset, and not by using the codesize opcode, since this of course changes when appending data to the code.