Definition ∞ EVM instruction semantics define the precise operation and effect of each command executed by the Ethereum Virtual Machine. These semantics specify how each opcode modifies the EVM’s state, including stack manipulations, memory access, storage operations, and gas consumption. A thorough understanding of these rules is essential for smart contract developers to write secure and predictable code. It also forms the basis for formal verification methods, ensuring contract behavior aligns with its intended design.
Context ∞ EVM instruction semantics are a foundational concept in discussions concerning smart contract security, blockchain upgrades, and the development of new EVM-compatible networks. Any alteration or misinterpretation of these semantics can lead to critical vulnerabilities or unexpected contract behavior, which often becomes a focus in post-mortem analyses of smart contract exploits. Precision in these definitions is paramount for maintaining the integrity and determinism of the Ethereum blockchain and its derivatives.
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