ethereum.tangerine_whistle.vm.instructions.system
Ethereum Virtual Machine (EVM) System Instructions ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. contents:: Table of Contents :backlinks: none :local:
Introduction
Implementations of the EVM system related instructions.
create
Creates a new account with associated code.
Parameters
evm : The current EVM frame.
def create(evm: Evm) -> None:
51 | """ |
---|---|
52 | Creates a new account with associated code. |
53 |
|
54 | Parameters |
55 | ---------- |
56 | evm : |
57 | The current EVM frame. |
58 | """ |
59 | # This import causes a circular import error |
60 | # if it's not moved inside this method |
61 | from ...vm.interpreter import STACK_DEPTH_LIMIT, process_create_message |
62 | |
63 | # STACK |
64 | endowment = pop(evm.stack) |
65 | memory_start_position = pop(evm.stack) |
66 | memory_size = pop(evm.stack) |
67 | |
68 | # GAS |
69 | extend_memory = calculate_gas_extend_memory( |
70 | evm.memory, [(memory_start_position, memory_size)] |
71 | ) |
72 | |
73 | charge_gas(evm, GAS_CREATE + extend_memory.cost) |
74 | |
75 | create_message_gas = max_message_call_gas(Uint(evm.gas_left)) |
76 | evm.gas_left -= create_message_gas |
77 | |
78 | # OPERATION |
79 | evm.memory += b"\x00" * extend_memory.expand_by |
80 | sender_address = evm.message.current_target |
81 | sender = get_account(evm.env.state, sender_address) |
82 | |
83 | contract_address = compute_contract_address( |
84 | evm.message.current_target, |
85 | get_account(evm.env.state, evm.message.current_target).nonce, |
86 | ) |
87 | |
88 | if ( |
89 | sender.balance < endowment |
90 | or sender.nonce == Uint(2**64 - 1) |
91 | or evm.message.depth + Uint(1) > STACK_DEPTH_LIMIT |
92 | ): |
93 | push(evm.stack, U256(0)) |
94 | evm.gas_left += create_message_gas |
95 | elif account_has_code_or_nonce(evm.env.state, contract_address): |
96 | increment_nonce(evm.env.state, evm.message.current_target) |
97 | push(evm.stack, U256(0)) |
98 | else: |
99 | call_data = memory_read_bytes( |
100 | evm.memory, memory_start_position, memory_size |
101 | ) |
102 |
|
103 | increment_nonce(evm.env.state, evm.message.current_target) |
104 |
|
105 | child_message = Message( |
106 | caller=evm.message.current_target, |
107 | target=Bytes0(), |
108 | gas=create_message_gas, |
109 | value=endowment, |
110 | data=b"", |
111 | code=call_data, |
112 | current_target=contract_address, |
113 | depth=evm.message.depth + Uint(1), |
114 | code_address=None, |
115 | should_transfer_value=True, |
116 | parent_evm=evm, |
117 | ) |
118 | child_evm = process_create_message(child_message, evm.env) |
119 |
|
120 | if child_evm.error: |
121 | incorporate_child_on_error(evm, child_evm) |
122 | push(evm.stack, U256(0)) |
123 | else: |
124 | incorporate_child_on_success(evm, child_evm) |
125 | push( |
126 | evm.stack, U256.from_be_bytes(child_evm.message.current_target) |
127 | ) |
128 | |
129 | # PROGRAM COUNTER |
130 | evm.pc += Uint(1) |
return_
Halts execution returning output data.
Parameters
evm : The current EVM frame.
def return_(evm: Evm) -> None:
134 | """ |
---|---|
135 | Halts execution returning output data. |
136 |
|
137 | Parameters |
138 | ---------- |
139 | evm : |
140 | The current EVM frame. |
141 | """ |
142 | # STACK |
143 | memory_start_position = pop(evm.stack) |
144 | memory_size = pop(evm.stack) |
145 | |
146 | # GAS |
147 | extend_memory = calculate_gas_extend_memory( |
148 | evm.memory, [(memory_start_position, memory_size)] |
149 | ) |
150 | |
151 | charge_gas(evm, GAS_ZERO + extend_memory.cost) |
152 | |
153 | # OPERATION |
154 | evm.memory += b"\x00" * extend_memory.expand_by |
155 | evm.output = memory_read_bytes( |
156 | evm.memory, memory_start_position, memory_size |
157 | ) |
158 | |
159 | evm.running = False |
160 | |
161 | # PROGRAM COUNTER |
162 | 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, memory_input_start_position: U256, memory_input_size: U256, memory_output_start_position: U256, memory_output_size: U256) -> None:
178 | """ |
---|---|
179 | Perform the core logic of the `CALL*` family of opcodes. |
180 | """ |
181 | from ...vm.interpreter import STACK_DEPTH_LIMIT, process_message |
182 | |
183 | if evm.message.depth + Uint(1) > STACK_DEPTH_LIMIT: |
184 | evm.gas_left += gas |
185 | push(evm.stack, U256(0)) |
186 | return |
187 | |
188 | call_data = memory_read_bytes( |
189 | evm.memory, memory_input_start_position, memory_input_size |
190 | ) |
191 | code = get_account(evm.env.state, code_address).code |
192 | child_message = Message( |
193 | caller=caller, |
194 | target=to, |
195 | gas=gas, |
196 | value=value, |
197 | data=call_data, |
198 | code=code, |
199 | current_target=to, |
200 | depth=evm.message.depth + Uint(1), |
201 | code_address=code_address, |
202 | should_transfer_value=should_transfer_value, |
203 | parent_evm=evm, |
204 | ) |
205 | child_evm = process_message(child_message, evm.env) |
206 | |
207 | if child_evm.error: |
208 | incorporate_child_on_error(evm, child_evm) |
209 | push(evm.stack, U256(0)) |
210 | else: |
211 | incorporate_child_on_success(evm, child_evm) |
212 | push(evm.stack, U256(1)) |
213 | |
214 | actual_output_size = min(memory_output_size, U256(len(child_evm.output))) |
215 | memory_write( |
216 | evm.memory, |
217 | memory_output_start_position, |
218 | child_evm.output[:actual_output_size], |
219 | ) |
call
Message-call into an account.
Parameters
evm : The current EVM frame.
def call(evm: Evm) -> None:
223 | """ |
---|---|
224 | Message-call into an account. |
225 |
|
226 | Parameters |
227 | ---------- |
228 | evm : |
229 | The current EVM frame. |
230 | """ |
231 | # STACK |
232 | gas = Uint(pop(evm.stack)) |
233 | to = to_address(pop(evm.stack)) |
234 | value = pop(evm.stack) |
235 | memory_input_start_position = pop(evm.stack) |
236 | memory_input_size = pop(evm.stack) |
237 | memory_output_start_position = pop(evm.stack) |
238 | memory_output_size = pop(evm.stack) |
239 | |
240 | # GAS |
241 | extend_memory = calculate_gas_extend_memory( |
242 | evm.memory, |
243 | [ |
244 | (memory_input_start_position, memory_input_size), |
245 | (memory_output_start_position, memory_output_size), |
246 | ], |
247 | ) |
248 | _account_exists = account_exists(evm.env.state, to) |
249 | create_gas_cost = Uint(0) if _account_exists else GAS_NEW_ACCOUNT |
250 | transfer_gas_cost = Uint(0) if value == 0 else GAS_CALL_VALUE |
251 | message_call_gas = calculate_message_call_gas( |
252 | value, |
253 | gas, |
254 | Uint(evm.gas_left), |
255 | extend_memory.cost, |
256 | GAS_CALL + create_gas_cost + transfer_gas_cost, |
257 | ) |
258 | charge_gas(evm, message_call_gas.cost + extend_memory.cost) |
259 | |
260 | # OPERATION |
261 | evm.memory += b"\x00" * extend_memory.expand_by |
262 | sender_balance = get_account( |
263 | evm.env.state, evm.message.current_target |
264 | ).balance |
265 | if sender_balance < value: |
266 | push(evm.stack, U256(0)) |
267 | evm.gas_left += message_call_gas.stipend |
268 | else: |
269 | generic_call( |
270 | evm, |
271 | message_call_gas.stipend, |
272 | value, |
273 | evm.message.current_target, |
274 | to, |
275 | to, |
276 | True, |
277 | memory_input_start_position, |
278 | memory_input_size, |
279 | memory_output_start_position, |
280 | memory_output_size, |
281 | ) |
282 | |
283 | # PROGRAM COUNTER |
284 | 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:
288 | """ |
---|---|
289 | Message-call into this account with alternative account’s code. |
290 |
|
291 | Parameters |
292 | ---------- |
293 | evm : |
294 | The current EVM frame. |
295 | """ |
296 | # STACK |
297 | gas = Uint(pop(evm.stack)) |
298 | code_address = to_address(pop(evm.stack)) |
299 | value = pop(evm.stack) |
300 | memory_input_start_position = pop(evm.stack) |
301 | memory_input_size = pop(evm.stack) |
302 | memory_output_start_position = pop(evm.stack) |
303 | memory_output_size = pop(evm.stack) |
304 | |
305 | # GAS |
306 | to = evm.message.current_target |
307 | |
308 | extend_memory = calculate_gas_extend_memory( |
309 | evm.memory, |
310 | [ |
311 | (memory_input_start_position, memory_input_size), |
312 | (memory_output_start_position, memory_output_size), |
313 | ], |
314 | ) |
315 | transfer_gas_cost = Uint(0) if value == 0 else GAS_CALL_VALUE |
316 | message_call_gas = calculate_message_call_gas( |
317 | value, |
318 | gas, |
319 | Uint(evm.gas_left), |
320 | extend_memory.cost, |
321 | GAS_CALL + transfer_gas_cost, |
322 | ) |
323 | charge_gas(evm, message_call_gas.cost + extend_memory.cost) |
324 | |
325 | # OPERATION |
326 | evm.memory += b"\x00" * extend_memory.expand_by |
327 | sender_balance = get_account( |
328 | evm.env.state, evm.message.current_target |
329 | ).balance |
330 | if sender_balance < value: |
331 | push(evm.stack, U256(0)) |
332 | evm.gas_left += message_call_gas.stipend |
333 | else: |
334 | generic_call( |
335 | evm, |
336 | message_call_gas.stipend, |
337 | value, |
338 | evm.message.current_target, |
339 | to, |
340 | code_address, |
341 | True, |
342 | memory_input_start_position, |
343 | memory_input_size, |
344 | memory_output_start_position, |
345 | memory_output_size, |
346 | ) |
347 | |
348 | # PROGRAM COUNTER |
349 | evm.pc += Uint(1) |
selfdestruct
Halt execution and register account for later deletion.
Parameters
evm : The current EVM frame.
def selfdestruct(evm: Evm) -> None:
353 | """ |
---|---|
354 | Halt execution and register account for later deletion. |
355 |
|
356 | Parameters |
357 | ---------- |
358 | evm : |
359 | The current EVM frame. |
360 | """ |
361 | # STACK |
362 | beneficiary = to_address(pop(evm.stack)) |
363 | |
364 | # GAS |
365 | gas_cost = GAS_SELF_DESTRUCT |
366 | if not account_exists(evm.env.state, beneficiary): |
367 | gas_cost += GAS_SELF_DESTRUCT_NEW_ACCOUNT |
368 | |
369 | originator = evm.message.current_target |
370 | |
371 | refunded_accounts = evm.accounts_to_delete |
372 | parent_evm = evm.message.parent_evm |
373 | while parent_evm is not None: |
374 | refunded_accounts.update(parent_evm.accounts_to_delete) |
375 | parent_evm = parent_evm.message.parent_evm |
376 | |
377 | if originator not in refunded_accounts: |
378 | evm.refund_counter += REFUND_SELF_DESTRUCT |
379 | |
380 | charge_gas(evm, gas_cost) |
381 | |
382 | # OPERATION |
383 | beneficiary_balance = get_account(evm.env.state, beneficiary).balance |
384 | originator_balance = get_account(evm.env.state, originator).balance |
385 | |
386 | # First Transfer to beneficiary |
387 | set_account_balance( |
388 | evm.env.state, beneficiary, beneficiary_balance + originator_balance |
389 | ) |
390 | # Next, Zero the balance of the address being deleted (must come after |
391 | # sending to beneficiary in case the contract named itself as the |
392 | # beneficiary). |
393 | set_account_balance(evm.env.state, originator, U256(0)) |
394 | |
395 | # register account for deletion |
396 | evm.accounts_to_delete.add(originator) |
397 | |
398 | # HALT the execution |
399 | evm.running = False |
400 | |
401 | # PROGRAM COUNTER |
402 | pass |
delegatecall
Message-call into an account.
Parameters
evm : The current EVM frame.
def delegatecall(evm: Evm) -> None:
406 | """ |
---|---|
407 | Message-call into an account. |
408 |
|
409 | Parameters |
410 | ---------- |
411 | evm : |
412 | The current EVM frame. |
413 | """ |
414 | # STACK |
415 | gas = Uint(pop(evm.stack)) |
416 | code_address = to_address(pop(evm.stack)) |
417 | memory_input_start_position = pop(evm.stack) |
418 | memory_input_size = pop(evm.stack) |
419 | memory_output_start_position = pop(evm.stack) |
420 | memory_output_size = pop(evm.stack) |
421 | |
422 | # GAS |
423 | extend_memory = calculate_gas_extend_memory( |
424 | evm.memory, |
425 | [ |
426 | (memory_input_start_position, memory_input_size), |
427 | (memory_output_start_position, memory_output_size), |
428 | ], |
429 | ) |
430 | message_call_gas = calculate_message_call_gas( |
431 | U256(0), gas, Uint(evm.gas_left), extend_memory.cost, GAS_CALL |
432 | ) |
433 | charge_gas(evm, message_call_gas.cost + extend_memory.cost) |
434 | |
435 | # OPERATION |
436 | evm.memory += b"\x00" * extend_memory.expand_by |
437 | generic_call( |
438 | evm, |
439 | message_call_gas.stipend, |
440 | evm.message.value, |
441 | evm.message.caller, |
442 | evm.message.current_target, |
443 | code_address, |
444 | False, |
445 | memory_input_start_position, |
446 | memory_input_size, |
447 | memory_output_start_position, |
448 | memory_output_size, |
449 | ) |
450 | |
451 | # PROGRAM COUNTER |
452 | evm.pc += Uint(1) |