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ethereum/core/src/main/java/org/hyperledger/besu/ethereum/mainnet/SystemCallProcessor.java
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| /* | ||
| * Copyright contributors to Hyperledger Besu. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with | ||
| * the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on | ||
| * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the | ||
| * specific language governing permissions and limitations under the License. | ||
| * | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| */ | ||
| package org.hyperledger.besu.ethereum.mainnet; | ||
|
|
||
| import static org.hyperledger.besu.evm.frame.MessageFrame.DEFAULT_MAX_STACK_SIZE; | ||
|
|
||
| import org.hyperledger.besu.datatypes.Address; | ||
| import org.hyperledger.besu.datatypes.Wei; | ||
| import org.hyperledger.besu.ethereum.core.ProcessableBlockHeader; | ||
| import org.hyperledger.besu.evm.account.Account; | ||
| import org.hyperledger.besu.evm.code.CodeV0; | ||
| import org.hyperledger.besu.evm.frame.MessageFrame; | ||
| import org.hyperledger.besu.evm.operation.BlockHashOperation; | ||
| import org.hyperledger.besu.evm.processor.AbstractMessageProcessor; | ||
| import org.hyperledger.besu.evm.tracing.OperationTracer; | ||
| import org.hyperledger.besu.evm.worldstate.WorldUpdater; | ||
|
|
||
| import java.util.Deque; | ||
| import java.util.Optional; | ||
|
|
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| import org.apache.tuweni.bytes.Bytes; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
||
| public class SystemCallProcessor { | ||
| private static final Logger LOG = LoggerFactory.getLogger(SystemCallProcessor.class); | ||
|
|
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| /** The system address */ | ||
| static final Address SYSTEM_ADDRESS = | ||
| Address.fromHexString("0xfffffffffffffffffffffffffffffffffffffffe"); | ||
|
|
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| private final MainnetTransactionProcessor mainnetTransactionProcessor; | ||
|
|
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| public SystemCallProcessor(final MainnetTransactionProcessor mainnetTransactionProcessor) { | ||
| this.mainnetTransactionProcessor = mainnetTransactionProcessor; | ||
| } | ||
|
|
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| /** | ||
| * Processes a system call to a specified address, using the provided world state, block header, | ||
| * operation tracer, and block hash lookup. | ||
| * | ||
| * @param callAddress the address to call. | ||
| * @param worldState the current world state. | ||
| * @param blockHeader the current block header. | ||
| * @param operationTracer the operation tracer for tracing EVM operations. | ||
| * @param blockHashLookup the block hash lookup function. | ||
| * @return the output data from the call | ||
| */ | ||
| public Bytes process( | ||
| final Address callAddress, | ||
| final WorldUpdater worldState, | ||
| final ProcessableBlockHeader blockHeader, | ||
| final OperationTracer operationTracer, | ||
| final BlockHashOperation.BlockHashLookup blockHashLookup) { | ||
|
|
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| // if no code exists at CALL_ADDRESS, the call must fail silently | ||
| final Account maybeContract = worldState.get(callAddress); | ||
| if (maybeContract == null) { | ||
| LOG.trace("System call address not found {}", callAddress); | ||
| return null; | ||
| } | ||
|
|
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| final AbstractMessageProcessor messageProcessor = | ||
| mainnetTransactionProcessor.getMessageProcessor(MessageFrame.Type.MESSAGE_CALL); | ||
| final MessageFrame initialFrame = | ||
| createCallFrame(callAddress, worldState, blockHeader, blockHashLookup); | ||
|
|
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| return processFrame(initialFrame, messageProcessor, operationTracer, worldState); | ||
| } | ||
|
|
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| private Bytes processFrame( | ||
| final MessageFrame frame, | ||
| final AbstractMessageProcessor processor, | ||
| final OperationTracer tracer, | ||
| final WorldUpdater updater) { | ||
|
|
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| if (!frame.getCode().isValid()) { | ||
| throw new RuntimeException("System call did not execute to completion - opcode invalid"); | ||
| } | ||
|
|
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| Deque<MessageFrame> stack = frame.getMessageFrameStack(); | ||
| while (!stack.isEmpty()) { | ||
| processor.process(stack.peekFirst(), tracer); | ||
| } | ||
|
|
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| if (frame.getState() == MessageFrame.State.COMPLETED_SUCCESS) { | ||
| updater.commit(); | ||
| return frame.getOutputData(); | ||
| } | ||
|
|
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| // the call must execute to completion | ||
| throw new RuntimeException("System call did not execute to completion"); | ||
| } | ||
|
|
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| private MessageFrame createCallFrame( | ||
| final Address callAddress, | ||
| final WorldUpdater worldUpdater, | ||
| final ProcessableBlockHeader blockHeader, | ||
| final BlockHashOperation.BlockHashLookup blockHashLookup) { | ||
|
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| final Optional<Account> maybeContract = Optional.ofNullable(worldUpdater.get(callAddress)); | ||
| final AbstractMessageProcessor processor = | ||
| mainnetTransactionProcessor.getMessageProcessor(MessageFrame.Type.MESSAGE_CALL); | ||
|
|
||
| return MessageFrame.builder() | ||
| .maxStackSize(DEFAULT_MAX_STACK_SIZE) | ||
| .worldUpdater(worldUpdater) | ||
| .initialGas(30_000_000L) | ||
| .originator(SYSTEM_ADDRESS) | ||
| .gasPrice(Wei.ZERO) | ||
| .blobGasPrice(Wei.ZERO) | ||
| .value(Wei.ZERO) | ||
| .apparentValue(Wei.ZERO) | ||
| .blockValues(blockHeader) | ||
| .completer(__ -> {}) | ||
| .miningBeneficiary(Address.ZERO) // Confirm this | ||
| .type(MessageFrame.Type.MESSAGE_CALL) | ||
| .address(callAddress) | ||
| .contract(callAddress) | ||
| .inputData(Bytes.EMPTY) | ||
| .sender(SYSTEM_ADDRESS) | ||
| .blockHashLookup(blockHashLookup) | ||
| .code( | ||
| maybeContract | ||
| .map(c -> processor.getCodeFromEVM(c.getCodeHash(), c.getCode())) | ||
| .orElse(CodeV0.EMPTY_CODE)) | ||
| .build(); | ||
| } | ||
| } |
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