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Closure Compiler is a JavaScript optimizing compiler. It parses your
JavaScript, analyzes it, removes dead code and rewrites and minimizes
what's left. It also checks syntax, variable references, and types, and
warns about common JavaScript pitfalls. It is used in many of Google's
JavaScript apps, including Gmail, Google Web Search, Google Maps, and
Google Docs.
This binary checks for style issues such as incorrect or missing JSDoc
usage, and missing goog.require() statements. It does not do more advanced
checks such as typechecking.
/*
* Copyright 2012 The Closure Compiler Authors.
*
* 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.google.javascript.jscomp;
import com.google.common.annotations.GwtIncompatible;
import java.io.PrintStream;
import java.lang.management.CompilationMXBean;
import java.lang.management.GarbageCollectorMXBean;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;
import java.lang.management.MemoryPoolMXBean;
import java.lang.management.MemoryUsage;
import java.util.List;
import java.util.StringTokenizer;
/**
* A class to report jvm/jmx statistics.
* Borrowed from:
* http://code.google.com/p/dart/source/browse/trunk/dart/compiler/java/com/google/dart/compiler/metrics/JvmMetrics.java
*/
@GwtIncompatible("Unneccesary")
class JvmMetrics {
private static final int TABULAR_COLON_POS = 40;
private static final long ONE_KILO_BYTE = 1L << 10L;
private static final long ONE_MEGA_BYTE = 1L << 20L;
private static final long ONE_GIGA_BYTE = 1L << 30L;
public static void maybeWriteJvmMetrics(PrintStream out, String options) {
if (options == null) {
return;
}
boolean verboseMode = false;
boolean prettyMode = false;
StringTokenizer st = new StringTokenizer(options, ":");
// options are grouped in order 'detail:format:types'
if (st.hasMoreTokens()) {
String mode = st.nextToken();
if (mode.equalsIgnoreCase("verbose")) {
verboseMode = true;
}
}
if (st.hasMoreTokens()) {
String mode = st.nextToken();
if (mode.equalsIgnoreCase("pretty")) {
prettyMode = true;
}
}
if (st.hasMoreTokens()) {
while (st.hasMoreTokens()) {
String types = st.nextToken();
StringTokenizer typeSt = new StringTokenizer(types, ",");
while (typeSt.hasMoreElements()) {
String type = typeSt.nextToken();
writeMetrics(out, type, verboseMode, prettyMode);
}
}
} else {
// the default
writeMetrics(out, "all", verboseMode, prettyMode);
}
}
private static void writeMetrics(
PrintStream out, String type, boolean verbose, boolean pretty) {
if (type.equals("gc") || type.equalsIgnoreCase("all")) {
writeGarbageCollectionStats(out, verbose, pretty);
}
if (type.equals("mem") || type.equalsIgnoreCase("all")) {
writeMemoryMetrics(out, verbose, pretty);
}
if (type.equals("jit") || type.equalsIgnoreCase("all")) {
writeJitMetrics(out, verbose, pretty);
}
}
private static void writeJitMetrics(
PrintStream out, boolean verbose, boolean pretty) {
CompilationMXBean cBean = ManagementFactory.getCompilationMXBean();
String name;
if (verbose) {
name = cBean.getName();
} else {
name = "total";
}
if (pretty) {
out.println("\nJIT Stats");
out.printf("\t%s jit time: %d ms%n", name, cBean.getTotalCompilationTime());
} else {
out.println(normalizeTabularColonPos(String.format("%s-jit-time-ms : %d",
normalizeName(name), cBean.getTotalCompilationTime())));
}
}
private static void writeOverallMemoryUsage(
PrintStream out, MemoryUsage usage, String prefix, boolean pretty) {
if (pretty) {
out.format("\t%s\n", prefix);
out.format("\t\tavailable : %s\n", formatBytes(usage.getMax()));
out.format("\t\tcurrent : %s\n", formatBytes(usage.getUsed()));
} else {
prefix = normalizeName(prefix);
out.println(normalizeTabularColonPos(
String.format("%s-available-bytes : %d", prefix, usage.getMax())));
out.println(normalizeTabularColonPos(
String.format("%s-current-bytes : %d", prefix, usage.getUsed())));
}
}
private static void writePoolMemoryUsage(PrintStream out, MemoryUsage usage,
MemoryUsage peakUsage, String prefix, boolean pretty) {
if (pretty) {
out.format("\t\tavailable : %s\n",
formatBytes(usage.getMax()));
out.format("\t\tpeak : %s\n",
formatBytes(peakUsage.getUsed()));
out.format("\t\tcurrent : %s\n",
formatBytes(usage.getUsed()));
} else {
out.println(normalizeTabularColonPos(
String.format("%s-available-bytes : %d", prefix, usage.getMax())));
out.println(normalizeTabularColonPos(
String.format("%s-peak-bytes : %d", prefix, peakUsage.getUsed())));
out.println(normalizeTabularColonPos(
String.format("%s-current-bytes : %d", prefix, usage.getUsed())));
}
}
private static void writeMemoryMetrics(
PrintStream out, boolean verbose, boolean pretty) {
if (pretty) {
out.println("\nMemory usage");
}
// only show overall stats in verbose mode
if (verbose) {
MemoryMXBean overallMemBean = ManagementFactory.getMemoryMXBean();
MemoryUsage usage = overallMemBean.getHeapMemoryUsage();
writeOverallMemoryUsage(out, usage, "Heap", pretty);
usage = overallMemBean.getNonHeapMemoryUsage();
writeOverallMemoryUsage(out, usage, "Non-heap", pretty);
}
if (verbose) {
List mpBeans = ManagementFactory.getMemoryPoolMXBeans();
for (MemoryPoolMXBean mpBean : mpBeans) {
MemoryUsage currentUsage = mpBean.getUsage();
MemoryUsage peakUsage = mpBean.getPeakUsage();
if (pretty) {
out.println("\tPool " + mpBean.getName());
writePoolMemoryUsage(out, currentUsage, peakUsage, null, true);
} else {
writePoolMemoryUsage(out, currentUsage, peakUsage,
"mem-pool-" + normalizeName(mpBean.getName()), false);
}
}
} else {
long available = 0;
long current = 0;
long peak = 0;
List mpBeans = ManagementFactory.getMemoryPoolMXBeans();
for (MemoryPoolMXBean mpBean : mpBeans) {
MemoryUsage currentUsage = mpBean.getUsage();
available += currentUsage.getMax();
current += currentUsage.getUsed();
MemoryUsage peakUsage = mpBean.getPeakUsage();
peak += peakUsage.getUsed();
}
MemoryUsage summaryUsage = new MemoryUsage(
0, current, current, available);
MemoryUsage summaryPeakUsage = new MemoryUsage(0, peak, peak, peak);
if (pretty) {
out.format("\tAggregate of %d memory pools\n", mpBeans.size());
writePoolMemoryUsage(out, summaryUsage, summaryPeakUsage, null, true);
} else {
writePoolMemoryUsage(out, summaryUsage, summaryPeakUsage, "mem", false);
}
}
}
private static void writeGarbageCollectionStats(
PrintStream out, boolean verbose, boolean pretty) {
List gcBeans =
ManagementFactory.getGarbageCollectorMXBeans();
if (verbose) {
if (pretty) {
out.println("\nGarbage collection stats");
for (GarbageCollectorMXBean gcBean : gcBeans) {
out.println("\tCollector " + gcBean.getName());
out.format(
"\t\tcollection count : %d\n", gcBean.getCollectionCount());
out.format(
"\t\tcollection time : %d ms\n", gcBean.getCollectionTime());
}
} else {
for (GarbageCollectorMXBean gcBean : gcBeans) {
String name = normalizeName(gcBean.getName());
out.println(normalizeTabularColonPos(String.format("gc-" + name
+ "-collection-count : %d", gcBean.getCollectionCount())));
out.println(normalizeTabularColonPos(String.format("gc-" + name
+ "-collection-time-ms : %d", gcBean.getCollectionTime())));
}
}
} else {
long collectionCount = 0;
long collectionTime = 0;
int collectorCount = gcBeans.size();
for (GarbageCollectorMXBean gcBean : gcBeans) {
collectionCount += gcBean.getCollectionCount();
collectionTime += gcBean.getCollectionTime();
}
if (pretty) {
out.println("\nGarbage collection stats");
out.format("\tAggregate of %d collectors\n", collectorCount);
out.format("\t\tcollection count : %d\n", collectionCount);
out.format("\t\tcollection time : %d ms\n", collectionTime);
} else {
String name = normalizeName("aggregate");
out.println(normalizeTabularColonPos(
String.format("gc-%s-collection-count : %d", name,
collectionCount)));
out.println(normalizeTabularColonPos(
String.format("gc-%s-collection-time-ms : %d", name,
collectionTime)));
}
}
}
private static String normalizeName(String name) {
return name.replace(' ', '_').toLowerCase();
}
private static String normalizeTabularColonPos(String string) {
StringBuilder sb = new StringBuilder(string);
int index = sb.indexOf(":");
for (; index < TABULAR_COLON_POS; ++index) {
sb.insert(index, ' ');
}
return sb.toString();
}
private static String formatBytes(long numBytes) {
if (numBytes < ONE_KILO_BYTE) {
return String.format("%d B", numBytes);
} else if (numBytes < ONE_MEGA_BYTE) {
return String.format("%d KB", numBytes / ONE_KILO_BYTE);
} else if (numBytes < ONE_GIGA_BYTE) {
return String.format("%d MB", numBytes / ONE_MEGA_BYTE);
} else {
return String.format("%d GB", numBytes / ONE_GIGA_BYTE);
}
}
}