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Backport JS profiler from Helma NG. Use rhino.profile = true to activate.

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This commit is contained in:
hns 2009-09-27 18:59:38 +00:00
parent 410226aa36
commit 0dc5aed374
3 changed files with 158 additions and 1 deletions
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4
src/helma/scripting/rhino/RhinoCore.java
View file

@ -95,6 +95,7 @@ public final class RhinoCore implements ScopeProvider {
// debugger/tracer flags
boolean hasDebugger = false;
boolean hasTracer = false;
boolean hasProfiler = false;
private boolean isInitialized = false;
// dynamic portion of the type check sleep that grows
@ -120,9 +121,10 @@ public final class RhinoCore implements ScopeProvider {
hasDebugger = "true".equalsIgnoreCase(app.getProperty("rhino.debug"));
hasTracer = "true".equalsIgnoreCase(app.getProperty("rhino.trace"));
hasProfiler = "true".equalsIgnoreCase(app.getProperty("rhino.profile"));
// Set default optimization level according to whether debugger is on
if (hasDebugger || hasTracer) {
if (hasDebugger || hasTracer || hasProfiler) {
optLevel = -1;
} else {
String opt = app.getProperty("rhino.optlevel");

13
src/helma/scripting/rhino/RhinoEngine.java
View file

@ -28,6 +28,7 @@ import helma.objectmodel.db.Relation;
import helma.objectmodel.db.Node;
import helma.scripting.*;
import helma.scripting.rhino.debug.Tracer;
import helma.scripting.rhino.debug.Profiler;
import helma.util.StringUtils;
import org.mozilla.javascript.*;
import org.mozilla.javascript.serialize.ScriptableOutputStream;
@ -163,6 +164,8 @@ public class RhinoEngine implements ScriptingEngine {
if (core.hasTracer) {
context.setDebugger(new Tracer(getResponse()), null);
} else if (core.hasProfiler) {
context.setDebugger(new Profiler(), null);
}
// register the engine with the current thread
@ -209,6 +212,16 @@ public class RhinoEngine implements ScriptingEngine {
* execution context has terminated.
*/
public synchronized void exitContext() {
if (core.hasProfiler) {
try {
Profiler profiler = (Profiler) Context.getCurrentContext().getDebugger();
String result = profiler.getResult();
getResponse().debug("<pre>" + result + "</pre>");
System.out.println(result);
} catch (Exception x) {
app.logError("Error in profiler: " + x, x);
}
}
// unregister the engine threadlocal
engines.set(null);
Context.exit();

142
src/helma/scripting/rhino/debug/Profiler.java Normal file
View file

@ -0,0 +1,142 @@
package helma.scripting.rhino.debug;
import org.mozilla.javascript.debug.Debugger;
import org.mozilla.javascript.debug.DebuggableScript;
import org.mozilla.javascript.debug.DebugFrame;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.Scriptable;
import java.util.*;
public class Profiler implements Debugger {
HashMap frames = new HashMap();
/**
* Create a profiler that writes to this response object
*/
public Profiler() {
}
/**
* Implementws handleCompilationDone in interface org.mozilla.javascript.debug.Debugger
*/
public void handleCompilationDone(Context cx, DebuggableScript script, String source) {}
/**
* Implements getFrame() in interface org.mozilla.javascript.debug.Debugger
*/
public DebugFrame getFrame(Context cx, DebuggableScript script) {
if (script.isFunction()) {
String name = getFunctionName(script);
ProfilerFrame frame = (ProfilerFrame) frames.get(name);
if (frame == null) {
frame = new ProfilerFrame(name);
frames.put(name, frame);
}
return frame;
}
return null;
}
/**
* Get a string representation for the given script
* @param script a function or script
* @return the file and/or function name of the script
*/
static String getFunctionName(DebuggableScript script) {
if (script.isFunction()) {
if (script.getFunctionName() != null) {
return script.getSourceName() + ": " + script.getFunctionName();
} else {
return script.getSourceName() + ": #" + script.getLineNumbers()[0];
}
} else {
return script.getSourceName();
}
}
public String getResult() {
ProfilerFrame[] f = (ProfilerFrame[]) frames.values().toArray(new ProfilerFrame[0]);
Arrays.sort(f, new Comparator() {
public int compare(Object o1, Object o2) {
return ((ProfilerFrame)o2).runtime - ((ProfilerFrame)o1).runtime;
}
});
StringBuffer buffer = new StringBuffer(" total average calls path\n");
buffer.append("==================================================================\n");
for (int i = 0; i < Math.min(100, f.length); i++) {
buffer.append(f[i].renderLine(0));
}
return buffer.toString();
}
class ProfilerFrame implements DebugFrame {
Stack timer = new Stack();
int runtime, invocations, lineNumber;
String name;
ProfilerFrame(String name) {
this.name = name;
}
/**
* Called when execution is ready to start bytecode interpretation
* for entered a particular function or script.
*/
public void onEnter(Context cx, Scriptable activation,
Scriptable thisObj, Object[] args) {
long time = System.nanoTime();
timer.push(new Long(time));
}
/**
* Called when thrown exception is handled by the function or script.
*/
public void onExceptionThrown(Context cx, Throwable ex) {
invocations ++;
Long time = (Long) timer.pop();
runtime += System.nanoTime() - time.longValue();
}
/**
* Called when the function or script for this frame is about to return.
*/
public void onExit(Context cx, boolean byThrow, Object resultOrException) {
invocations ++;
Long time = (Long) timer.pop();
runtime += System.nanoTime() - time.longValue();
}
/**
* Called when the function or script executes a 'debugger' statement.
*
* @param cx current Context for this thread
*/
public void onDebuggerStatement(Context cx) {
// not implemented
}
/**
* Called when executed code reaches new line in the source.
*/
public void onLineChange(Context cx, int lineNumber) {
this.lineNumber = lineNumber;
}
public String renderLine(int prefixLength) {
long millis = Math.round(this.runtime / 1000000);
Formatter formatter = new java.util.Formatter();
Object[] args = new Object[] {
Integer.valueOf((int) millis),
Integer.valueOf(Math.round(millis / invocations)),
Integer.valueOf(invocations),
name.substring(prefixLength)
};
formatter.format("%1$7d ms %2$5d ms %3$6d %4$s%n", args);
return formatter.toString();
}
}
}