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/*
* Copyright 2018 Google Inc.
*
* 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
*
* https://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 trebuchet.importers.ftrace.events
import trebuchet.importers.ftrace.FtraceImporterState
import trebuchet.importers.ftrace.FtraceLine
import trebuchet.io.DataSlice
import trebuchet.model.InvalidId
import trebuchet.util.BufferReader
import trebuchet.util.MatchResult
import trebuchet.util.StringCache
import java.util.regex.Matcher
import java.util.regex.Pattern
const val FtraceLineRE = """^ *(.{1,16})-(\d+) +(?:\( *(\d+)?-*\) )?\[(\d+)] (?:[dX.][^\s]+)? *([\d.]*): *([^:]*): *(.*) *$"""
interface FtraceEventDetails {
fun import(event: FtraceEvent, state: FtraceImporterState)
}
val NoDetails = object : FtraceEventDetails {
override fun import(event: FtraceEvent, state: FtraceImporterState) {}
}
typealias EventDetailsParser = (state: EventParserState, slice: DataSlice) -> FtraceEventDetails?
class SharedEventParserState {
private val patterns = mutableListOf<Pattern>()
private val detailHandlers = hashMapOf<String, EventDetailsParser>()
private var frozen = false
init {
EventRegistry.forEach { it(this) }
}
fun addPattern(newPattern: String) = addPattern(Pattern.compile(newPattern))
fun addPattern(newPattern: Pattern): Int {
if (frozen) throw IllegalStateException("State is frozen")
val index = patterns.size
patterns.add(newPattern)
return index
}
fun createParser(): EventParserState {
frozen = true
return EventParserState(patterns, detailHandlers)
}
fun onParseDetails(funcName: String, parser: EventDetailsParser) {
if (frozen) throw IllegalStateException("State is frozen")
detailHandlers[funcName] = parser
}
inline fun onParseDetailsWithMatch(funcName: String, regex: String,
crossinline result: MatchResult.() -> FtraceEventDetails?) {
val patternMatcher = addPattern(regex)
onParseDetails(funcName) { state, details ->
state.ifMatches(patternMatcher, details) {
return@onParseDetails this.result()
}
null
}
}
inline fun onParseDetailsWithMatch(funcNames: Array<String>, regex: String,
crossinline result: MatchResult.() -> FtraceEventDetails?) {
val patternMatcher = addPattern(regex)
funcNames.forEach { funcName ->
onParseDetails(funcName) { state, details ->
state.ifMatches(patternMatcher, details) {
return@onParseDetails this.result()
}
null
}
}
}
}
val GlobalSharedParserState = SharedEventParserState()
fun createEventParser() = GlobalSharedParserState.createParser()
class EventParserState constructor(patterns: List<Pattern>,
private val detailHandlers: Map<String, EventDetailsParser>) {
val matchers = Array<Matcher>(patterns.size) { patterns[it].matcher("") }
val stringCache = StringCache()
val reader = BufferReader()
inline fun ifMatches(matcher: Int, slice: DataSlice, result: MatchResult.() -> Unit): Boolean {
reader.reset(slice, stringCache)
return reader.tryMatch(matchers[matcher], result)
}
fun detailsForText(funcName: CharSequence, detailsSlice: DataSlice): FtraceEventDetails {
return detailHandlers[funcName]?.invoke(this, detailsSlice) ?: NoDetails
}
inline fun <T> readDetails(detailsSlice: DataSlice, init: BufferReader.() -> T): T {
return reader.read(detailsSlice, stringCache, init)
}
}
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