EIP-1803: Rename opcodes for clarity (#1803)

EIPS/eip-1803.md

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+---
+eip: 1803
+title: Rename opcodes for clarity
+author: Alex Beregszaszi (@axic)
+type: Standards Track
+category: Interface
+status: Draft
+created: 2017-07-28
+requires: 141
+---
+
+## Abstract
+
+Rename the `BALANCE`, `SHA3`, `NUMBER`, `GASLIMIT`, `GAS` and `INVALID` opcodes to reflect their true meaning.
+
+## Specification
+
+Rename the opcodes as follows:
+- `BALANCE` (`0x31`) to `EXTBALANCE` to be in line with `EXTCODESIZE`, `EXTCODECOPY` and `EXTCODEHASH`
+- `SHA3` (`0x20`) to `KECCAK256`
+- `NUMBER` (`0x43`) to `BLOCKNUMBER`
+- `GASLIMIT` (`0x45`) to `BLOCKGASLIMIT` to avoid confusion with the gas limit of the transaction
+- `GAS` (`0x5a`) to `GASLEFT` to be clear what it refers to
+- `INVALID` (`0xfe`) to `ABORT` to clearly articulate when someone refers this opcode as opposed to "any invalid opcode"
+
+## Backwards Compatibility
+
+This has no effect on any code. It can influence what mnemonics assemblers will use.
+
+## Implementation
+
+Not applicable.
+
+## References
+
+Renaming `SHA3` was previously proposed by [EIP-59](https://github.com/ethereum/EIPs/issues/59).
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).