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/*
* Copyright (C) 2023 The Android Open Source Project
*
* 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 com.android.tools.debuggertests
import com.sun.jdi.LocalVariable
import com.sun.jdi.Location
import com.sun.jdi.event.BreakpointEvent
import com.sun.jdi.event.Event
import java.io.Closeable
private const val BREAKPOINT_CLASS = "BreakpointKt"
private const val BREAKPOINT_LINE = 20
/** A simple test engine */
internal abstract class Engine : Closeable {
protected abstract suspend fun createDebugger(): Debugger
/**
* Executes a single test.
* 1. Starts a [Debugger]
* 2. Sets a breakpoint at Breakpoint.breakpoint()
* 3. Resumes the program each time it hits a breakpoint
* 4. On each breakpoint, emits information about the frame into a string
*/
suspend fun runTest(): String {
val debugger = createDebugger()
debugger.start()
debugger.setBreakpoint(BREAKPOINT_CLASS, BREAKPOINT_LINE)
val actual = buildString {
while (true) {
val breakpoint = debugger.resume<Event>() as? BreakpointEvent ?: break
val frame = breakpoint.thread().frames()[1]
val location = frame.location()
append("Breakpoint: ${location.sourceName()}:${location.lineNumber()}\n")
append("========================================================\n")
frame.visibleVariables().map { variable ->
val scope =
"[%d-%d]".format(
variable.getStartScope().codeIndex(),
variable.getEndScope().codeIndex()
)
val line =
"%-2d %-10s: %-20s: %s\n".format(
variable.getSlot(),
scope,
variable.name(),
variable.typeName()
)
append(line)
}
append('\n')
}
}
return actual
}
enum class EngineType(private val factory: (String) -> Engine) {
SIMPLE(::SimpleEngine),
JVM(::JvmEngine),
;
fun getEngine(testName: String) = factory(testName)
}
}
private fun LocalVariable.getStartScope(): Location = getFieldValue("scopeStart")
private fun LocalVariable.getEndScope(): Location = getFieldValue("scopeEnd")
private fun LocalVariable.getSlot(): Int = getFieldValue("slot")
private inline fun <reified T> Any.getFieldValue(name: String): T {
val field = javaClass.getDeclaredField(name).apply { isAccessible = true }
return field.get(this) as T
}
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