Struct near_vm_logic::gas_counter::GasCounter

pub struct GasCounter { /* private fields */ }

Gas counter (a part of VMlogic)

Implementations

impl GasCounter

pub fn new( ext_costs_config: ExtCostsConfig, max_gas_burnt: Gas, opcode_cost: u32, prepaid_gas: Gas, is_view: bool ) -> Self

pub fn burn_gas(&mut self, gas_burnt: Gas) -> Result<(), VMLogicError>

Simpler version of deduct_gas() for when no promises are involved.

Return an error if there are arithmetic overflows.

pub fn process_gas_limit( &mut self, new_burnt_gas: Gas, new_used_gas: Gas ) -> HostError

pub fn pay_wasm_gas(&mut self, opcodes: u32) -> Result<(), VMLogicError>

pub fn gas_counter_raw_ptr(&mut self) -> *mut FastGasCounter

Very special function to get the gas counter pointer for generated machine code. Please do not use, unless fully understand Rust aliasing and other consequences. Can be used to emit inlined code like pay_wasm_gas(), i.e. mov base, gas_counter_raw_ptr mov rax, [base + 0] ; current burnt gas mov rcx, [base + 16] ; opcode cost imul rcx, block_ops_count ; block cost add rax, rcx ; new burnt gas jo emit_integer_overflow cmp rax, [base + 8] ; unsigned compare with burnt limit mov [base + 0], rax ja emit_gas_exceeded

pub fn pay_per(&mut self, cost: ExtCosts, num: u64) -> Result<(), VMLogicError>

A helper function to pay a multiple of a cost.

pub fn pay_base(&mut self, cost: ExtCosts) -> Result<(), VMLogicError>

A helper function to pay base cost gas.

pub fn pay_action_accumulated( &mut self, burn_gas: Gas, use_gas: Gas, action: ActionCosts ) -> Result<(), VMLogicError>

A helper function to pay base cost gas fee for batching an action.

Args:

• burn_gas: amount of gas to burn;
• use_gas: amount of gas to reserve;
• action: what kind of action is charged for;

pub fn add_trie_fees( &mut self, count: &TrieNodesCount ) -> Result<(), VMLogicError>

pub fn prepay_gas(&mut self, use_gas: Gas) -> Result<(), VMLogicError>

pub fn burnt_gas(&self) -> Gas

pub fn used_gas(&self) -> Gas

Amount of gas used through promises and amount burned.

pub fn unused_gas(&self) -> Gas

Remaining gas based on the amount of prepaid gas not yet used.

pub fn profile_data(&self) -> ProfileDataV3