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/*
* Copyright 2009 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
*
* 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.gwt.core.client.impl;
import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.JavaScriptException;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.core.client.JsArray;
import com.google.gwt.core.client.JsArrayString;
/**
* Encapsulates logic to create a stack trace. This class should only be used in
* Production Mode.
*/
public class StackTraceCreator {
/**
* This class acts as a deferred-binding hook point to allow more optimal
* versions to be substituted. This base version simply crawls
* arguments.callee.caller.
*/
static class Collector {
public native JsArrayString collect() /*-{
var seen = {};
var toReturn = [];
// Ignore the collect() and fillInStackTrace call
var callee = arguments.callee.caller.caller;
while (callee) {
var name = this.@com.google.gwt.core.client.impl.StackTraceCreator.Collector::extractName(Ljava/lang/String;)(callee.toString());
toReturn.push(name);
// Avoid infinite loop by associating names to function objects. We
// record each caller in the withThisName variable to handle functions
// with identical names but separate identity (such as 'anonymous')
var keyName = ':' + name;
var withThisName = seen[keyName];
if (withThisName) {
var i, j;
for (i = 0, j = withThisName.length; i < j; i++) {
if (withThisName[i] === callee) {
return toReturn;
}
}
}
(withThisName || (seen[keyName] = [])).push(callee);
callee = callee.caller;
}
return toReturn;
}-*/;
public void createStackTrace(JavaScriptException e) {
JsArrayString stack = inferFrom(e.getException());
StackTraceElement[] stackTrace = new StackTraceElement[stack.length()];
for (int i = 0, j = stackTrace.length; i < j; i++) {
stackTrace[i] = new StackTraceElement("Unknown", stack.get(i), null,
LINE_NUMBER_UNKNOWN);
}
e.setStackTrace(stackTrace);
}
public void fillInStackTrace(Throwable t) {
JsArrayString stack = StackTraceCreator.createStackTrace();
StackTraceElement[] stackTrace = new StackTraceElement[stack.length()];
for (int i = 0, j = stackTrace.length; i < j; i++) {
stackTrace[i] = new StackTraceElement("Unknown", stack.get(i), null,
LINE_NUMBER_UNKNOWN);
}
t.setStackTrace(stackTrace);
}
/**
* Returns the list of properties of an unexpected JavaScript exception.
*/
public native String getProperties(JavaScriptObject e) /*-{
var result = "";
try {
for (var prop in e) {
if (prop != "name" && prop != "message" && prop != "toString") {
try {
result += "\n " + prop + ": " + e[prop];
} catch (ignored) {
// Skip the property if it threw an exception.
}
}
}
} catch (ignored) {
// If we can't do "in" on the exception, just return what we have.
}
return result;
}-*/;
/**
* Attempt to infer the stack from an unknown JavaScriptObject that had been
* thrown. The default implementation just returns an empty array.
*
* @param e a JavaScriptObject
*/
public JsArrayString inferFrom(JavaScriptObject e) {
return JavaScriptObject.createArray().cast();
}
/**
* Extract the name of a function from it's toString() representation.
* Package-access for testing.
*/
protected String extractName(String fnToString) {
return extractNameFromToString(fnToString);
}
/**
* Raise an exception and return it.
*/
protected native JavaScriptObject makeException() /*-{
try {
null.a();
} catch (e) {
return e;
}
}-*/;
}
/**
* Collaborates with JsStackEmulator.
*/
static class CollectorEmulated extends Collector {
@Override
public JsArrayString collect() {
JsArrayString toReturn = JsArrayString.createArray().cast();
JsArray stack = getStack();
for (int i = 0, j = getStackDepth(); i < j; i++) {
String name = stack.get(i) == null ? "anonymous"
: extractName(stack.get(i).toString());
// Reverse the order
toReturn.set(j - i - 1, name);
}
return toReturn;
}
@Override
public void createStackTrace(JavaScriptException e) {
// No-op, relying on initializer call to collect()
}
@Override
public void fillInStackTrace(Throwable t) {
JsArrayString stack = collect();
JsArrayString locations = getLocation();
StackTraceElement[] stackTrace = new StackTraceElement[stack.length()];
for (int i = 0, j = stackTrace.length; i < j; i++) {
// Locations is also backwards
String location = locations.get(j - i - 1);
String fileName = null;
int lineNumber = LINE_NUMBER_UNKNOWN;
if (location != null) {
int idx = location.indexOf(':');
if (idx != -1) {
fileName = location.substring(0, idx);
lineNumber = Integer.parseInt(location.substring(idx + 1));
} else {
lineNumber = Integer.parseInt(location);
}
}
stackTrace[i] = new StackTraceElement("Unknown", stack.get(i),
fileName, lineNumber);
}
t.setStackTrace(stackTrace);
}
/**
* When compiler.stackMode = emulated, return an empty string, rather than a
* list of properties, since the additional information regarding the origin
* of the JavaScriptException, relative to compiled JavaScript source code,
* adds no real value, since we have fully emulated stack traces.
*/
@Override
public String getProperties(JavaScriptObject e) {
return "";
}
@Override
public JsArrayString inferFrom(JavaScriptObject e) {
throw new RuntimeException("Should not reach here");
}
private native JsArrayString getLocation()/*-{
return $location;
}-*/;
private native JsArray getStack()/*-{
return $stack;
}-*/;
private native int getStackDepth() /*-{
return $stackDepth;
}-*/;
}
/**
* Mozilla provides a stack property in thrown objects.
*/
static class CollectorMoz extends Collector {
/**
* This implementation doesn't suffer from the limitations of crawling
* caller since Mozilla provides proper activation records.
*/
@Override
public JsArrayString collect() {
return splice(inferFrom(makeException()), toSplice());
}
@Override
public JsArrayString inferFrom(JavaScriptObject e) {
JsArrayString stack = getStack(e);
for (int i = 0, j = stack.length(); i < j; i++) {
stack.set(i, extractName(stack.get(i)));
}
return stack;
}
protected native JsArrayString getStack(JavaScriptObject e) /*-{
return (e && e.stack) ? e.stack.split('\n') : [];
}-*/;
protected int toSplice() {
return 2;
}
}
/**
* Chrome uses a slightly different format to Mozilla.
*
* See http://code.google.com/p/v8/source/browse/branches/bleeding_edge/src/
* messages.js?r=2340#712 for formatting code.
*
* Function calls can be of the four following forms:
*
*
* at file.js:1:2
* at functionName (file.js:1:2)
* at Type.functionName (file.js:1:2)
* at Type.functionName [as methodName] (file.js:1:2)
*
*/
static class CollectorChrome extends CollectorMoz {
@Override
public JsArrayString collect() {
JsArrayString res = super.collect();
if (res.length() == 0) {
/*
* Ensure Safari falls back to default Collector implementation.
* Remember to remove this method call from the stack:
*/
res = splice(new Collector().collect(), 1);
}
return res;
}
@Override
public JsArrayString inferFrom(JavaScriptObject e) {
JsArrayString stack = super.inferFrom(e);
if (stack.length() == 0) {
// Safari should fall back to default Collector:
return new Collector().inferFrom(e);
} else {
// Chrome contains the error itself as the first line of the stack:
return splice(stack, 1);
}
}
@Override
protected String extractName(String fnToString) {
if (fnToString.length() == 0) {
return "anonymous";
}
String toReturn = fnToString.trim();
// Strip the "at " prefix:
if (toReturn.startsWith("at ")) {
toReturn = toReturn.substring(3);
}
// Strip bracketed items from the end:
int index = toReturn.indexOf("[");
if (index == -1) {
index = toReturn.indexOf("(");
}
if (index == -1) {
// No bracketed items found, hence no function name available:
return "anonymous";
} else {
// Bracketed items found: strip them off.
toReturn = toReturn.substring(0, index).trim();
}
// Strip the Type off to leave just the functionName:
index = toReturn.indexOf('.');
if (index != -1) {
toReturn = toReturn.substring(index + 1);
}
return toReturn.length() > 0 ? toReturn : "anonymous";
}
@Override
protected int toSplice() {
return 3;
}
}
/**
* Opera encodes stack trace information in the error's message.
*/
static class CollectorOpera extends CollectorMoz {
/**
* We have much a much simpler format to work with.
*/
@Override
protected String extractName(String fnToString) {
return fnToString.length() == 0 ? "anonymous" : fnToString;
}
/**
* Opera has the function name on every-other line.
*/
@Override
protected JsArrayString getStack(JavaScriptObject e) {
JsArrayString toReturn = getMessage(e);
assert toReturn.length() % 2 == 0 : "Expecting an even number of lines";
int i, i2, j;
for (i = 0, i2 = 0, j = toReturn.length(); i2 < j; i++, i2 += 2) {
int idx = toReturn.get(i2).lastIndexOf("function ");
if (idx == -1) {
toReturn.set(i, "");
} else {
toReturn.set(i, toReturn.get(i2).substring(idx + 9).trim());
}
}
setLength(toReturn, i);
return toReturn;
}
@Override
protected int toSplice() {
return 3;
}
private native JsArrayString getMessage(JavaScriptObject e) /*-{
return (e && e.message) ? e.message.split('\n') : [];
}-*/;
private native void setLength(JsArrayString obj, int length) /*-{
obj.length = length;
}-*/;
}
/**
* When compiler.stackMode = strip, we stub out the collector.
*/
static class CollectorNull extends Collector {
@Override
public JsArrayString collect() {
return JsArrayString.createArray().cast();
}
@Override
public void createStackTrace(JavaScriptException e) {
// empty, since Throwable.getStackTrace() properly handles null
}
@Override
public void fillInStackTrace(Throwable t) {
// empty, since Throwable.getStackTrace() properly handles null
}
}
private static final int LINE_NUMBER_UNKNOWN = -1;
/**
* Create a stack trace based on a JavaScriptException. This method should
* only be called in Production Mode.
*/
public static void createStackTrace(JavaScriptException e) {
if (!GWT.isScript()) {
throw new RuntimeException(
"StackTraceCreator should only be called in Production Mode");
}
GWT. create(Collector.class).createStackTrace(e);
}
/**
* Fill in a stack trace based on the current execution stack. This method
* should only be called in Production Mode.
*/
public static void fillInStackTrace(Throwable t) {
if (!GWT.isScript()) {
throw new RuntimeException(
"StackTraceCreator should only be called in Production Mode");
}
GWT. create(Collector.class).fillInStackTrace(t);
}
/**
* Returns the list of properties of an unexpected JavaScript exception,
* unless compiler.stackMode = emulated, in which case the empty string is
* returned. This method should only be called in Production Mode.
*/
public static String getProperties(JavaScriptObject e) {
if (!GWT.isScript()) {
throw new RuntimeException(
"StackTraceCreator should only be called in Production Mode");
}
return GWT. create(Collector.class).getProperties(e);
}
/**
* Create a stack trace based on the current execution stack. This method
* should only be called in Production Mode.
*/
static JsArrayString createStackTrace() {
if (!GWT.isScript()) {
throw new RuntimeException(
"StackTraceCreator should only be called in Production Mode");
}
return GWT. create(Collector.class).collect();
}
static String extractNameFromToString(String fnToString) {
String toReturn = "";
fnToString = fnToString.trim();
int index = fnToString.indexOf("(");
if (index != -1) {
int start = fnToString.startsWith("function") ? 8 : 0;
toReturn = fnToString.substring(start, index).trim();
}
return toReturn.length() > 0 ? toReturn : "anonymous";
}
private static native JsArrayString splice(JsArrayString arr, int length) /*-{
(arr.length >= length) && arr.splice(0, length);
return arr;
}-*/;
}
