ethereum.forks.muir_glacier.vm.instructions.systemethereum.forks.berlin.vm.instructions.system
Ethereum Virtual Machine (EVM) System Instructions.
.. contents:: Table of Contents :backlinks: none :local:
Introduction
Implementations of the EVM system related instructions.
generic_create ¶
Core logic used by the CREATE* family of opcodes.
def generic_create(evm: Evm, endowment: U256, contract_address: Address, memory_start_position: U256, memory_size: U256) -> None:
| 69 | """ |
|---|---|
| 70 | Core logic used by the `CREATE*` family of opcodes. |
| 71 | """ |
| 72 | # This import causes a circular import error |
| 73 | # if it's not moved inside this method |
| 74 | from ...vm.interpreter import STACK_DEPTH_LIMIT, process_create_message |
| 75 | |
| 76 | call_data = memory_read_bytes( |
| 77 | evm.memory, memory_start_position, memory_size |
| 78 | ) |
| 79 | |
| 80 | create_message_gas = max_message_call_gas(Uint(evm.gas_left)) |
| 81 | evm.gas_left -= create_message_gas |
| 82 | if evm.message.is_static: |
| 83 | raise WriteInStaticContext |
| 84 | evm.return_data = b"" |
| 85 | |
| 86 | sender_address = evm.message.current_target |
| 87 | sender = get_account(evm.message.block_env.state, sender_address) |
| 88 | |
| 89 | if ( |
| 90 | sender.balance < endowment |
| 91 | or sender.nonce == Uint(2**64 - 1) |
| 92 | or evm.message.depth + Uint(1) > STACK_DEPTH_LIMIT |
| 93 | ): |
| 94 | evm.gas_left += create_message_gas |
| 95 | push(evm.stack, U256(0)) |
| 96 | return |
| 97 | |
| 98 | evm.accessed_addresses.add(contract_address) |
| 99 | |
| 100 | if account_has_code_or_nonce( |
| 101 | evm.message.block_env.state, contract_address |
| 102 | ) or account_has_storage(evm.message.block_env.state, contract_address): |
| 103 | increment_nonce( |
| 104 | evm.message.block_env.state, evm.message.current_target |
| 105 | ) |
| 106 | push(evm.stack, U256(0)) |
| 107 | return |
| 105 | |
| 106 | call_data = memory_read_bytes( |
| 107 | evm.memory, memory_start_position, memory_size |
| 108 | ) |
| 108 | |
| 109 | increment_nonce(evm.message.block_env.state, evm.message.current_target) |
| 110 | |
| 111 | child_message = Message( |
| 112 | block_env=evm.message.block_env, |
| 113 | tx_env=evm.message.tx_env, |
| 114 | caller=evm.message.current_target, |
| 115 | target=Bytes0(), |
| 116 | gas=create_message_gas, |
| 117 | value=endowment, |
| 118 | data=b"", |
| 119 | code=call_data, |
| 120 | current_target=contract_address, |
| 121 | depth=evm.message.depth + Uint(1), |
| 122 | code_address=None, |
| 123 | should_transfer_value=True, |
| 124 | is_static=False, |
| 125 | accessed_addresses=evm.accessed_addresses.copy(), |
| 126 | accessed_storage_keys=evm.accessed_storage_keys.copy(), |
| 127 | parent_evm=evm, |
| 128 | ) |
| 129 | child_evm = process_create_message(child_message) |
| 130 | |
| 131 | if child_evm.error: |
| 132 | incorporate_child_on_error(evm, child_evm) |
| 133 | evm.return_data = child_evm.output |
| 134 | push(evm.stack, U256(0)) |
| 135 | else: |
| 136 | incorporate_child_on_success(evm, child_evm) |
| 137 | evm.return_data = b"" |
| 138 | push(evm.stack, U256.from_be_bytes(child_evm.message.current_target)) |
create ¶
Creates a new account with associated code.
Parameters
evm : The current EVM frame.
def create(evm: Evm) -> None:
| 142 | """ |
|---|---|
| 143 | Creates a new account with associated code. |
| 144 | |
| 145 | Parameters |
| 146 | ---------- |
| 147 | evm : |
| 148 | The current EVM frame. |
| 149 | |
| 150 | """ |
| 151 | # STACK |
| 152 | endowment = pop(evm.stack) |
| 153 | memory_start_position = pop(evm.stack) |
| 154 | memory_size = pop(evm.stack) |
| 155 | |
| 156 | # GAS |
| 157 | extend_memory = calculate_gas_extend_memory( |
| 158 | evm.memory, [(memory_start_position, memory_size)] |
| 159 | ) |
| 160 | |
| 161 | charge_gas(evm, GAS_CREATE + extend_memory.cost) |
| 162 | |
| 163 | # OPERATION |
| 164 | evm.memory += b"\x00" * extend_memory.expand_by |
| 165 | contract_address = compute_contract_address( |
| 166 | evm.message.current_target, |
| 167 | get_account( |
| 168 | evm.message.block_env.state, evm.message.current_target |
| 169 | ).nonce, |
| 170 | ) |
| 171 | |
| 172 | generic_create( |
| 173 | evm, endowment, contract_address, memory_start_position, memory_size |
| 174 | ) |
| 175 | |
| 176 | # PROGRAM COUNTER |
| 177 | evm.pc += Uint(1) |
create2 ¶
Creates a new account with associated code.
It's similar to the CREATE opcode except that the address of the new account depends on the init_code instead of the nonce of sender.
Parameters
evm : The current EVM frame.
def create2(evm: Evm) -> None:
| 181 | """ |
|---|---|
| 182 | Creates a new account with associated code. |
| 183 | |
| 184 | It's similar to the CREATE opcode except that the address of the new |
| 185 | account depends on the init_code instead of the nonce of sender. |
| 186 | |
| 187 | Parameters |
| 188 | ---------- |
| 189 | evm : |
| 190 | The current EVM frame. |
| 191 | |
| 192 | """ |
| 193 | # STACK |
| 194 | endowment = pop(evm.stack) |
| 195 | memory_start_position = pop(evm.stack) |
| 196 | memory_size = pop(evm.stack) |
| 197 | salt = pop(evm.stack).to_be_bytes32() |
| 198 | |
| 199 | # GAS |
| 200 | extend_memory = calculate_gas_extend_memory( |
| 201 | evm.memory, [(memory_start_position, memory_size)] |
| 202 | ) |
| 203 | call_data_words = ceil32(Uint(memory_size)) // Uint(32) |
| 204 | charge_gas( |
| 205 | evm, |
| 206 | GAS_CREATE |
| 207 | + GAS_KECCAK256_PER_WORD * call_data_words |
| 208 | + extend_memory.cost, |
| 209 | ) |
| 210 | |
| 211 | # OPERATION |
| 212 | evm.memory += b"\x00" * extend_memory.expand_by |
| 213 | contract_address = compute_create2_contract_address( |
| 214 | evm.message.current_target, |
| 215 | salt, |
| 216 | memory_read_bytes(evm.memory, memory_start_position, memory_size), |
| 217 | ) |
| 218 | |
| 219 | generic_create( |
| 220 | evm, endowment, contract_address, memory_start_position, memory_size |
| 221 | ) |
| 222 | |
| 223 | # PROGRAM COUNTER |
| 224 | evm.pc += Uint(1) |
return_ ¶
Halts execution returning output data.
Parameters
evm : The current EVM frame.
def return_(evm: Evm) -> None:
| 228 | """ |
|---|---|
| 229 | Halts execution returning output data. |
| 230 | |
| 231 | Parameters |
| 232 | ---------- |
| 233 | evm : |
| 234 | The current EVM frame. |
| 235 | |
| 236 | """ |
| 237 | # STACK |
| 238 | memory_start_position = pop(evm.stack) |
| 239 | memory_size = pop(evm.stack) |
| 240 | |
| 241 | # GAS |
| 242 | extend_memory = calculate_gas_extend_memory( |
| 243 | evm.memory, [(memory_start_position, memory_size)] |
| 244 | ) |
| 245 | |
| 246 | charge_gas(evm, GAS_ZERO + extend_memory.cost) |
| 247 | |
| 248 | # OPERATION |
| 249 | evm.memory += b"\x00" * extend_memory.expand_by |
| 250 | evm.output = memory_read_bytes( |
| 251 | evm.memory, memory_start_position, memory_size |
| 252 | ) |
| 253 | |
| 254 | evm.running = False |
| 255 | |
| 256 | # PROGRAM COUNTER |
| 257 | pass |
generic_call ¶
Perform the core logic of the CALL* family of opcodes.
def generic_call(evm: Evm, gas: Uint, value: U256, caller: Address, to: Address, code_address: Address, should_transfer_value: bool, is_staticcall: bool, memory_input_start_position: U256, memory_input_size: U256, memory_output_start_position: U256, memory_output_size: U256) -> None:
| 274 | """ |
|---|---|
| 275 | Perform the core logic of the `CALL*` family of opcodes. |
| 276 | """ |
| 277 | from ...vm.interpreter import STACK_DEPTH_LIMIT, process_message |
| 278 | |
| 279 | evm.return_data = b"" |
| 280 | |
| 281 | if evm.message.depth + Uint(1) > STACK_DEPTH_LIMIT: |
| 282 | evm.gas_left += gas |
| 283 | push(evm.stack, U256(0)) |
| 284 | return |
| 285 | |
| 286 | call_data = memory_read_bytes( |
| 287 | evm.memory, memory_input_start_position, memory_input_size |
| 288 | ) |
| 288 | code_account = get_account(evm.message.block_env.state, code_address) |
| 289 | code = get_code(evm.message.block_env.state, code_account.code_hash) |
| 289 | _code_account = get_account(evm.message.block_env.state, code_address) |
| 290 | code = get_code(evm.message.block_env.state, _code_account.code_hash) |
| 291 | child_message = Message( |
| 292 | block_env=evm.message.block_env, |
| 293 | tx_env=evm.message.tx_env, |
| 294 | caller=caller, |
| 295 | target=to, |
| 296 | gas=gas, |
| 297 | value=value, |
| 298 | data=call_data, |
| 299 | code=code, |
| 300 | current_target=to, |
| 301 | depth=evm.message.depth + Uint(1), |
| 302 | code_address=code_address, |
| 303 | should_transfer_value=should_transfer_value, |
| 304 | is_static=True if is_staticcall else evm.message.is_static, |
| 305 | accessed_addresses=evm.accessed_addresses.copy(), |
| 306 | accessed_storage_keys=evm.accessed_storage_keys.copy(), |
| 307 | parent_evm=evm, |
| 308 | ) |
| 309 | child_evm = process_message(child_message) |
| 310 | |
| 311 | if child_evm.error: |
| 312 | incorporate_child_on_error(evm, child_evm) |
| 313 | evm.return_data = child_evm.output |
| 314 | push(evm.stack, U256(0)) |
| 315 | else: |
| 316 | incorporate_child_on_success(evm, child_evm) |
| 317 | evm.return_data = child_evm.output |
| 318 | push(evm.stack, U256(1)) |
| 319 | |
| 320 | actual_output_size = min(memory_output_size, U256(len(child_evm.output))) |
| 321 | memory_write( |
| 322 | evm.memory, |
| 323 | memory_output_start_position, |
| 324 | child_evm.output[:actual_output_size], |
| 325 | ) |
call ¶
Message-call into an account.
Parameters
evm : The current EVM frame.
def call(evm: Evm) -> None:
| 329 | """ |
|---|---|
| 330 | Message-call into an account. |
| 331 | |
| 332 | Parameters |
| 333 | ---------- |
| 334 | evm : |
| 335 | The current EVM frame. |
| 336 | |
| 337 | """ |
| 338 | # STACK |
| 339 | gas = Uint(pop(evm.stack)) |
| 340 | to = to_address_masked(pop(evm.stack)) |
| 341 | value = pop(evm.stack) |
| 342 | memory_input_start_position = pop(evm.stack) |
| 343 | memory_input_size = pop(evm.stack) |
| 344 | memory_output_start_position = pop(evm.stack) |
| 345 | memory_output_size = pop(evm.stack) |
| 346 | |
| 347 | # GAS |
| 348 | extend_memory = calculate_gas_extend_memory( |
| 349 | evm.memory, |
| 350 | [ |
| 351 | (memory_input_start_position, memory_input_size), |
| 352 | (memory_output_start_position, memory_output_size), |
| 353 | ], |
| 354 | ) |
| 355 | |
| 356 | if to in evm.accessed_addresses: |
| 357 | access_gas_cost = GAS_WARM_ACCESS |
| 358 | else: |
| 359 | evm.accessed_addresses.add(to) |
| 360 | access_gas_cost = GAS_COLD_ACCOUNT_ACCESS |
| 361 | |
| 362 | code_address = to |
| 363 | |
| 364 | create_gas_cost = GAS_NEW_ACCOUNT |
| 365 | if value == 0 or is_account_alive(evm.message.block_env.state, to): |
| 366 | create_gas_cost = Uint(0) |
| 367 | transfer_gas_cost = Uint(0) if value == 0 else GAS_CALL_VALUE |
| 368 | message_call_gas = calculate_message_call_gas( |
| 369 | value, |
| 370 | gas, |
| 371 | Uint(evm.gas_left), |
| 372 | extend_memory.cost, |
| 364 | GAS_CALL + create_gas_cost + transfer_gas_cost, |
| 373 | access_gas_cost + create_gas_cost + transfer_gas_cost, |
| 374 | ) |
| 375 | charge_gas(evm, message_call_gas.cost + extend_memory.cost) |
| 376 | if evm.message.is_static and value != U256(0): |
| 377 | raise WriteInStaticContext |
| 378 | evm.memory += b"\x00" * extend_memory.expand_by |
| 379 | sender_balance = get_account( |
| 380 | evm.message.block_env.state, evm.message.current_target |
| 381 | ).balance |
| 382 | if sender_balance < value: |
| 383 | push(evm.stack, U256(0)) |
| 384 | evm.return_data = b"" |
| 385 | evm.gas_left += message_call_gas.sub_call |
| 386 | else: |
| 387 | generic_call( |
| 388 | evm, |
| 389 | message_call_gas.sub_call, |
| 390 | value, |
| 391 | evm.message.current_target, |
| 392 | to, |
| 393 | code_address, |
| 394 | True, |
| 395 | False, |
| 396 | memory_input_start_position, |
| 397 | memory_input_size, |
| 398 | memory_output_start_position, |
| 399 | memory_output_size, |
| 400 | ) |
| 401 | |
| 402 | # PROGRAM COUNTER |
| 403 | evm.pc += Uint(1) |
callcode ¶
Message-call into this account with alternative account’s code.
Parameters
evm : The current EVM frame.
def callcode(evm: Evm) -> None:
| 407 | """ |
|---|---|
| 408 | Message-call into this account with alternative account’s code. |
| 409 | |
| 410 | Parameters |
| 411 | ---------- |
| 412 | evm : |
| 413 | The current EVM frame. |
| 414 | |
| 415 | """ |
| 416 | # STACK |
| 417 | gas = Uint(pop(evm.stack)) |
| 418 | code_address = to_address_masked(pop(evm.stack)) |
| 419 | value = pop(evm.stack) |
| 420 | memory_input_start_position = pop(evm.stack) |
| 421 | memory_input_size = pop(evm.stack) |
| 422 | memory_output_start_position = pop(evm.stack) |
| 423 | memory_output_size = pop(evm.stack) |
| 424 | |
| 425 | # GAS |
| 426 | to = evm.message.current_target |
| 427 | |
| 428 | extend_memory = calculate_gas_extend_memory( |
| 429 | evm.memory, |
| 430 | [ |
| 431 | (memory_input_start_position, memory_input_size), |
| 432 | (memory_output_start_position, memory_output_size), |
| 433 | ], |
| 434 | ) |
| 435 | |
| 436 | if code_address in evm.accessed_addresses: |
| 437 | access_gas_cost = GAS_WARM_ACCESS |
| 438 | else: |
| 439 | evm.accessed_addresses.add(code_address) |
| 440 | access_gas_cost = GAS_COLD_ACCOUNT_ACCESS |
| 441 | |
| 442 | transfer_gas_cost = Uint(0) if value == 0 else GAS_CALL_VALUE |
| 443 | message_call_gas = calculate_message_call_gas( |
| 444 | value, |
| 445 | gas, |
| 446 | Uint(evm.gas_left), |
| 447 | extend_memory.cost, |
| 432 | GAS_CALL + transfer_gas_cost, |
| 448 | access_gas_cost + transfer_gas_cost, |
| 449 | ) |
| 450 | charge_gas(evm, message_call_gas.cost + extend_memory.cost) |
| 451 | |
| 452 | # OPERATION |
| 453 | evm.memory += b"\x00" * extend_memory.expand_by |
| 454 | sender_balance = get_account( |
| 455 | evm.message.block_env.state, evm.message.current_target |
| 456 | ).balance |
| 457 | if sender_balance < value: |
| 458 | push(evm.stack, U256(0)) |
| 459 | evm.return_data = b"" |
| 460 | evm.gas_left += message_call_gas.sub_call |
| 461 | else: |
| 462 | generic_call( |
| 463 | evm, |
| 464 | message_call_gas.sub_call, |
| 465 | value, |
| 466 | evm.message.current_target, |
| 467 | to, |
| 468 | code_address, |
| 469 | True, |
| 470 | False, |
| 471 | memory_input_start_position, |
| 472 | memory_input_size, |
| 473 | memory_output_start_position, |
| 474 | memory_output_size, |
| 475 | ) |
| 476 | |
| 477 | # PROGRAM COUNTER |
| 478 | evm.pc += Uint(1) |
selfdestruct ¶
Halt execution and register account for later deletion.
Parameters
evm : The current EVM frame.
def selfdestruct(evm: Evm) -> None:
| 482 | """ |
|---|---|
| 483 | Halt execution and register account for later deletion. |
| 484 | |
| 485 | Parameters |
| 486 | ---------- |
| 487 | evm : |
| 488 | The current EVM frame. |
| 489 | |
| 490 | """ |
| 491 | # STACK |
| 492 | beneficiary = to_address_masked(pop(evm.stack)) |
| 493 | |
| 494 | # GAS |
| 495 | gas_cost = GAS_SELF_DESTRUCT |
| 496 | if beneficiary not in evm.accessed_addresses: |
| 497 | evm.accessed_addresses.add(beneficiary) |
| 498 | gas_cost += GAS_COLD_ACCOUNT_ACCESS |
| 499 | |
| 500 | if ( |
| 501 | not is_account_alive(evm.message.block_env.state, beneficiary) |
| 502 | and get_account( |
| 503 | evm.message.block_env.state, evm.message.current_target |
| 504 | ).balance |
| 505 | != 0 |
| 506 | ): |
| 507 | gas_cost += GAS_SELF_DESTRUCT_NEW_ACCOUNT |
| 508 | |
| 509 | originator = evm.message.current_target |
| 510 | |
| 511 | refunded_accounts = evm.accounts_to_delete |
| 512 | parent_evm = evm.message.parent_evm |
| 513 | while parent_evm is not None: |
| 514 | refunded_accounts.update(parent_evm.accounts_to_delete) |
| 515 | parent_evm = parent_evm.message.parent_evm |
| 516 | |
| 517 | if originator not in refunded_accounts: |
| 518 | evm.refund_counter += REFUND_SELF_DESTRUCT |
| 519 | |
| 520 | charge_gas(evm, gas_cost) |
| 521 | if evm.message.is_static: |
| 522 | raise WriteInStaticContext |
| 523 | |
| 524 | originator = evm.message.current_target |
| 525 | beneficiary_balance = get_account( |
| 526 | evm.message.block_env.state, beneficiary |
| 527 | ).balance |
| 528 | originator_balance = get_account( |
| 529 | evm.message.block_env.state, originator |
| 530 | ).balance |
| 531 | |
| 532 | # First Transfer to beneficiary |
| 533 | set_account_balance( |
| 534 | evm.message.block_env.state, |
| 535 | beneficiary, |
| 536 | beneficiary_balance + originator_balance, |
| 537 | ) |
| 538 | # Next, Zero the balance of the address being deleted (must come after |
| 539 | # sending to beneficiary in case the contract named itself as the |
| 540 | # beneficiary). |
| 541 | set_account_balance(evm.message.block_env.state, originator, U256(0)) |
| 542 | |
| 543 | # register account for deletion |
| 544 | evm.accounts_to_delete.add(originator) |
| 545 | |
| 546 | # mark beneficiary as touched |
| 547 | if account_exists_and_is_empty(evm.message.block_env.state, beneficiary): |
| 548 | evm.touched_accounts.add(beneficiary) |
| 549 | |
| 550 | # HALT the execution |
| 551 | evm.running = False |
| 552 | |
| 553 | # PROGRAM COUNTER |
| 554 | pass |
delegatecall ¶
Message-call into an account.
Parameters
evm : The current EVM frame.
def delegatecall(evm: Evm) -> None:
| 558 | """ |
|---|---|
| 559 | Message-call into an account. |
| 560 | |
| 561 | Parameters |
| 562 | ---------- |
| 563 | evm : |
| 564 | The current EVM frame. |
| 565 | |
| 566 | """ |
| 567 | # STACK |
| 568 | gas = Uint(pop(evm.stack)) |
| 569 | code_address = to_address_masked(pop(evm.stack)) |
| 570 | memory_input_start_position = pop(evm.stack) |
| 571 | memory_input_size = pop(evm.stack) |
| 572 | memory_output_start_position = pop(evm.stack) |
| 573 | memory_output_size = pop(evm.stack) |
| 574 | |
| 575 | # GAS |
| 576 | extend_memory = calculate_gas_extend_memory( |
| 577 | evm.memory, |
| 578 | [ |
| 579 | (memory_input_start_position, memory_input_size), |
| 580 | (memory_output_start_position, memory_output_size), |
| 581 | ], |
| 582 | ) |
| 583 | |
| 584 | if code_address in evm.accessed_addresses: |
| 585 | access_gas_cost = GAS_WARM_ACCESS |
| 586 | else: |
| 587 | evm.accessed_addresses.add(code_address) |
| 588 | access_gas_cost = GAS_COLD_ACCOUNT_ACCESS |
| 589 | |
| 590 | message_call_gas = calculate_message_call_gas( |
| 564 | U256(0), gas, Uint(evm.gas_left), extend_memory.cost, GAS_CALL |
| 591 | U256(0), gas, Uint(evm.gas_left), extend_memory.cost, access_gas_cost |
| 592 | ) |
| 593 | charge_gas(evm, message_call_gas.cost + extend_memory.cost) |
| 594 | |
| 595 | # OPERATION |
| 596 | evm.memory += b"\x00" * extend_memory.expand_by |
| 597 | generic_call( |
| 598 | evm, |
| 599 | message_call_gas.sub_call, |
| 600 | evm.message.value, |
| 601 | evm.message.caller, |
| 602 | evm.message.current_target, |
| 603 | code_address, |
| 604 | False, |
| 605 | False, |
| 606 | memory_input_start_position, |
| 607 | memory_input_size, |
| 608 | memory_output_start_position, |
| 609 | memory_output_size, |
| 610 | ) |
| 611 | |
| 612 | # PROGRAM COUNTER |
| 613 | evm.pc += Uint(1) |
staticcall ¶
Message-call into an account.
Parameters
evm : The current EVM frame.
def staticcall(evm: Evm) -> None:
| 617 | """ |
|---|---|
| 618 | Message-call into an account. |
| 619 | |
| 620 | Parameters |
| 621 | ---------- |
| 622 | evm : |
| 623 | The current EVM frame. |
| 624 | |
| 625 | """ |
| 626 | # STACK |
| 627 | gas = Uint(pop(evm.stack)) |
| 628 | to = to_address_masked(pop(evm.stack)) |
| 629 | memory_input_start_position = pop(evm.stack) |
| 630 | memory_input_size = pop(evm.stack) |
| 631 | memory_output_start_position = pop(evm.stack) |
| 632 | memory_output_size = pop(evm.stack) |
| 633 | |
| 634 | # GAS |
| 635 | extend_memory = calculate_gas_extend_memory( |
| 636 | evm.memory, |
| 637 | [ |
| 638 | (memory_input_start_position, memory_input_size), |
| 639 | (memory_output_start_position, memory_output_size), |
| 640 | ], |
| 641 | ) |
| 642 | |
| 643 | if to in evm.accessed_addresses: |
| 644 | access_gas_cost = GAS_WARM_ACCESS |
| 645 | else: |
| 646 | evm.accessed_addresses.add(to) |
| 647 | access_gas_cost = GAS_COLD_ACCOUNT_ACCESS |
| 648 | |
| 649 | code_address = to |
| 650 | |
| 651 | message_call_gas = calculate_message_call_gas( |
| 652 | U256(0), |
| 653 | gas, |
| 654 | Uint(evm.gas_left), |
| 655 | extend_memory.cost, |
| 623 | GAS_CALL, |
| 656 | access_gas_cost, |
| 657 | ) |
| 658 | charge_gas(evm, message_call_gas.cost + extend_memory.cost) |
| 659 | |
| 660 | # OPERATION |
| 661 | evm.memory += b"\x00" * extend_memory.expand_by |
| 662 | generic_call( |
| 663 | evm, |
| 664 | message_call_gas.sub_call, |
| 665 | U256(0), |
| 666 | evm.message.current_target, |
| 667 | to, |
| 668 | code_address, |
| 669 | True, |
| 670 | True, |
| 671 | memory_input_start_position, |
| 672 | memory_input_size, |
| 673 | memory_output_start_position, |
| 674 | memory_output_size, |
| 675 | ) |
| 676 | |
| 677 | # PROGRAM COUNTER |
| 678 | evm.pc += Uint(1) |
revert ¶
Stop execution and revert state changes, without consuming all provided gas and also has the ability to return a reason.
Parameters
evm : The current EVM frame.
def revert(evm: Evm) -> None:
| 682 | """ |
|---|---|
| 683 | Stop execution and revert state changes, without consuming all provided gas |
| 684 | and also has the ability to return a reason. |
| 685 | |
| 686 | Parameters |
| 687 | ---------- |
| 688 | evm : |
| 689 | The current EVM frame. |
| 690 | |
| 691 | """ |
| 692 | # STACK |
| 693 | memory_start_index = pop(evm.stack) |
| 694 | size = pop(evm.stack) |
| 695 | |
| 696 | # GAS |
| 697 | extend_memory = calculate_gas_extend_memory( |
| 698 | evm.memory, [(memory_start_index, size)] |
| 699 | ) |
| 700 | |
| 701 | charge_gas(evm, extend_memory.cost) |
| 702 | |
| 703 | # OPERATION |
| 704 | evm.memory += b"\x00" * extend_memory.expand_by |
| 705 | output = memory_read_bytes(evm.memory, memory_start_index, size) |
| 706 | evm.output = Bytes(output) |
| 707 | raise Revert |