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docs: add documentation for EVM opcode offset constants #4760

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docs: add documentation for EVM opcode offset constants #4760

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5 changes: 5 additions & 0 deletions vyper/evm/assembler/core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -17,8 +17,13 @@
from vyper.evm.opcodes import get_opcodes
from vyper.exceptions import CompilerPanic

# EVM opcode base values for PUSH, DUP, and SWAP instructions
# These constants are used to calculate opcodes: OFFSET + instruction_number
# PUSH0 = 0x5F, PUSH1 = 0x60, PUSH2 = 0x61, etc.
PUSH_OFFSET = 0x5F
# DUP1 = 0x80, DUP2 = 0x81, DUP3 = 0x82, etc.
DUP_OFFSET = 0x7F
# SWAP1 = 0x90, SWAP2 = 0x91, SWAP3 = 0x92, etc.
SWAP_OFFSET = 0x8F


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