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feat: override difficulty opcode to always return zero #58

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Merged
yiweichi merged 3 commits into from
Jul 31, 2025
Merged

feat: override difficulty opcode to always return zero #58

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93b7b35
feat: override difficulty opcode to always return zero
yiweichi Jul 31, 2025
c67a26e
fix typo
yiweichi Jul 31, 2025
01030c4
update DIFFICULTY
yiweichi Jul 31, 2025
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13 changes: 13 additions & 0 deletions src/instructions.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@ use std::rc::Rc;

const HISTORY_STORAGE_ADDRESS: Address = address!("0x0000F90827F1C53a10cb7A02335B175320002935");
const HISTORY_SERVE_WINDOW: u64 = 8191;
const DIFFICULTY: U256 = U256::ZERO;

/// Holds the EVM instruction table for Scroll.
pub struct ScrollInstructions<WIRE: InterpreterTypes, HOST> {
Expand Down Expand Up @@ -67,6 +68,7 @@ where
/// - `TLOAD`
/// - `SELFDESTRUCT`
/// - `MCOPY`
/// - `DIFFICULTY`
pub fn make_scroll_instruction_table<WIRE: InterpreterTypes, HOST: ScrollContextTr>(
) -> InstructionTable<WIRE, HOST> {
let mut table = instruction_table::<WIRE, HOST>();
Expand All @@ -78,6 +80,7 @@ pub fn make_scroll_instruction_table<WIRE: InterpreterTypes, HOST: ScrollContext
table[opcode::TLOAD as usize] = tload::<WIRE, HOST>;
table[opcode::SELFDESTRUCT as usize] = selfdestruct::<WIRE, HOST>;
table[opcode::MCOPY as usize] = mcopy::<WIRE, HOST>;
table[opcode::DIFFICULTY as usize] = difficulty::<WIRE, HOST>;

table
}
Expand Down Expand Up @@ -216,6 +219,16 @@ fn mcopy<WIRE: InterpreterTypes, H: ScrollContextTr>(context: InstructionContext
interpreter.memory.copy(dst, src, len);
}

/// Implements the DIFFICULTY instruction.
///
/// Pushes the block difficulty(default to 0) onto the stack.
pub fn difficulty<WIRE: InterpreterTypes, H: Host + ?Sized>(
context: InstructionContext<'_, H, WIRE>,
) {
gas!(context.interpreter, gas::BASE);
push!(context.interpreter, DIFFICULTY);
}

// HELPER FUNCTIONS
// ================================================================================================

Expand Down