org.web3j.evm.PassthroughTracer.kt Maven / Gradle / Ivy
/*
* Copyright 2019 Web3 Labs Ltd.
*
* 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.
*/
package org.web3j.evm
import org.hyperledger.besu.evm.frame.MessageFrame
import org.web3j.evm.utils.NullReader
import java.io.BufferedReader
import java.io.File
import java.lang.StringBuilder
import org.hyperledger.besu.evm.EVM
import org.hyperledger.besu.evm.operation.Operation
data class PassthroughTracerContext(val source: String = "", val filePath: String? = null, val firstSelectedLine: Int? = null, val firstSelectedOffset: Int? = null)
class PassthroughTracer(metaFile: File? = File("build/resources/main/solidity")) : ConsoleDebugTracer(metaFile, BufferedReader(
NullReader()
)) {
private var passthroughTracerContext: PassthroughTracerContext = PassthroughTracerContext()
fun lastContext() = passthroughTracerContext
fun resetContext() {
passthroughTracerContext = PassthroughTracerContext()
}
@Throws(ExceptionalHaltException::class)
fun traceExecution(
messageFrame: MessageFrame,
evm: EVM,
executeOperation: Operation
) {
if (metaFile != null && metaFile.exists()) {
val (sourceMapElement, sourceFile) = sourceAtMessageFrame(messageFrame)
val (filePath, sourceSection) = sourceFile
val sb = StringBuilder()
if (sourceMapElement != null) sb.append("At solidity source location ${sourceMapElement.sourceFileByteOffset}:${sourceMapElement.lengthOfSourceRange}:${sourceMapElement.sourceIndex}:")
else sb.append("At unknown solidity source location:")
sb.append('\n')
sb.append('\n')
val trimmedSourceSection = mergeSourceContent(sourceSection)
.dropWhile { it.isBlank() }
.reversed()
.dropWhile { it.isBlank() }
.reversed()
passthroughTracerContext = if (trimmedSourceSection.isEmpty()) {
PassthroughTracerContext()
} else {
val source = sb.append(trimmedSourceSection.joinToString("\n")).toString()
val firstSelectedLine = sourceSection.entries.filter { it.value.selected }.map { it.key }.minOrNull()
val firstSelectedOffset = sourceSection[firstSelectedLine]?.offset
PassthroughTracerContext(source, filePath, firstSelectedLine, firstSelectedOffset)
}
}
executeOperation.execute(messageFrame, evm)
}
}