I was fiddling with the gwt canvas demo and ran across an Internal
Compiler Exception.
Not that I mind, because I am nothing if not flexible!
Should I poke into the compiler code since gwt developers have to
handle this all the time, or is it just because I've done something
very wrong?
Thanks if you know and thanks if you don't.
Sincerely,
David Heimann
Ubuntu 10.04.1 LTS \n \l
Eclipse SDK 3.6.1.M20100909-0800
Google App Engine Java SDK 1.4.2 1.4.2.v201102111811
Google Plugin for Eclipse 3.6 2.2.0.v201102111811
Eclipse Platform
3.6.1.r361_v20100909-9gF78GrkFqw7GrsZnvz0JWNTeb6fue6896L
Eclipse Help System 1.2.0.v20100427-7e7jEQFEp4jsWcboLU9l93
Eclipse RCP 3.6.1.r361_v20100827-9OArFLdFjY-ThSQXmKvKz0_T
Equinox p2 Provisioning
2.0.1.r361_v20100903-897HFZFFZRuSD2LMtVxyz0Vr
GWT Designer Core 2.2.0.r36x201102111446
GWT Designer Editor 2.2.0.r36x201102111505
WindowBuilder Core 0.9.0.r36x201102111430
Eclipse Plug-in Development Environment
3.6.1.r361_v20100727-7b7mFL-FET3dhESDgE5_bkJ
WindowBuilder CSS Support 0.9.0.r36x201102051550
WindowBuilder XML Core 0.9.0.r36x201102111443
Google Web Toolkit SDK 2.2.0 2.2.0.v201102111811
Source:
package com.gae01.egypt.client;
import com.google.gwt.canvas.client.Canvas;
import com.google.gwt.canvas.dom.client.Context2d;
import com.google.gwt.canvas.dom.client.CssColor;
import com.google.gwt.canvas.dom.client.FillStrokeStyle;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootPanel;
public class Papyrus implements EntryPoint {
static final String holderId = "canvasholder";
static final String upgradeMessage = "Your browser does not support
the HTML5 Canvas. Please upgrade your browser to view this demo.";
Canvas canvas;
Canvas backBuffer;
Context2d context;
Context2d backBufferContext;
static final int height = 400;
static final int width = 400;
final FillStrokeStyle strokeStyle = CssColor.make("#333300");
final CssColor redrawColor =
CssColor.make("rgba(255,255,255,0.6)");
@Override
public void onModuleLoad() {
// TODO Auto-generated method stub
canvas = Canvas.createIfSupported();
backBuffer = Canvas.createIfSupported();
if (canvas == null) {
RootPanel.get(holderId).add(new Label(upgradeMessage));
return;
}
canvas.setWidth(width + "px");
canvas.setHeight(height + "px");
canvas.setCoordinateSpaceWidth(width);
canvas.setCoordinateSpaceHeight(height);
backBuffer.setCoordinateSpaceWidth(width);
backBuffer.setCoordinateSpaceHeight(height);
RootPanel.get(holderId).add(canvas);
context = canvas.getContext2d();
backBufferContext = backBuffer.getContext2d();
}
void doUpdate() {
// update the back canvas
backBufferContext.setFillStyle(redrawColor);
backBufferContext.fillRect(0, 0, width, height);
context.setStrokeStyle(strokeStyle);
context.beginPath();
context.arc(0,0,20,0, Math.PI * 2, true);
context.closePath();
context.stroke();
}
}
Error:
Compiling module com.gae01.egypt.Papyrus
[ERROR] An internal compiler exception occurred
com.google.gwt.dev.jjs.InternalCompilerException: Unexpected error
during visit.
at
com.google.gwt.dev.jjs.ast.JVisitor.translateException(JVisitor.java:
108)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:127)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:119)
at com.google.gwt.dev.jjs.impl.ControlFlowAnalyzer
$RescueVisitor.rescue(ControlFlowAnalyzer.java:557)
at com.google.gwt.dev.jjs.impl.ControlFlowAnalyzer
$RescueVisitor.rescueAndInstantiate(ControlFlowAnalyzer.java:614)
at com.google.gwt.dev.jjs.impl.ControlFlowAnalyzer
$RescueVisitor.visit(ControlFlowAnalyzer.java:371)
at com.google.gwt.dev.jjs.ast.JNewInstance.traverse(JNewInstance.java:
84)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:124)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:119)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:115)
at
com.google.gwt.dev.jjs.ast.JThrowStatement.traverse(JThrowStatement.java:
38)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:143)
at
com.google.gwt.dev.jjs.ast.JVisitor.acceptWithInsertRemoveImmutable(JVisitor.java:
169)
at com.google.gwt.dev.jjs.ast.JBlock.traverse(JBlock.java:83)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:124)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:136)
at com.google.gwt.dev.jjs.ast.JIfStatement.traverse(JIfStatement.java:
53)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:143)
at
com.google.gwt.dev.jjs.ast.JVisitor.acceptWithInsertRemoveImmutable(JVisitor.java:
169)
at com.google.gwt.dev.jjs.ast.JBlock.traverse(JBlock.java:83)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:124)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:136)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:132)
at com.google.gwt.dev.jjs.ast.JMethodBody.traverse(JMethodBody.java:
82)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:124)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:119)
at com.google.gwt.dev.jjs.ast.JMethod.visitChildren(JMethod.java:329)
at com.google.gwt.dev.jjs.ast.JMethod.traverse(JMethod.java:297)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:124)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:119)
at com.google.gwt.dev.jjs.impl.ControlFlowAnalyzer
$RescueVisitor.rescue(ControlFlowAnalyzer.java:502)
at com.google.gwt.dev.jjs.impl.ControlFlowAnalyzer
$RescueVisitor.visit(ControlFlowAnalyzer.java:335)
at com.google.gwt.dev.jjs.ast.JMethodCall.traverse(JMethodCall.java:
170)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:124)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:119)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:115)
at
com.google.gwt.dev.jjs.ast.JReturnStatement.traverse(JReturnStatement.java:
39)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:143)
at
com.google.gwt.dev.jjs.ast.JVisitor.acceptWithInsertRemoveImmutable(JVisitor.java:
169)
at com.google.gwt.dev.jjs.ast.JBlock.traverse(JBlock.java:83)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:124)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:136)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:132)
at com.google.gwt.dev.jjs.ast.JMethodBody.traverse(JMethodBody.java:
82)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:124)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:119)
at com.google.gwt.dev.jjs.ast.JMethod.visitChildren(JMethod.java:329)
at com.google.gwt.dev.jjs.ast.JMethod.traverse(JMethod.java:297)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:124)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:119)
at com.google.gwt.dev.jjs.impl.ControlFlowAnalyzer
$RescueVisitor.rescue(ControlFlowAnalyzer.java:502)
at com.google.gwt.dev.jjs.impl.ControlFlowAnalyzer
$RescueVisitor.access$1200(ControlFlowAnalyzer.java:91)
at
com.google.gwt.dev.jjs.impl.ControlFlowAnalyzer.traverseFrom(ControlFlowAnalyzer.java:
801)
at
com.google.gwt.dev.jjs.impl.Pruner.traverseFromCodeGenTypes(Pruner.java:
678)
at com.google.gwt.dev.jjs.impl.Pruner.execImpl(Pruner.java:642)
at com.google.gwt.dev.jjs.impl.Pruner.exec(Pruner.java:526)
at
com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.optimizeLoop(JavaToJavaScriptCompiler.java:
796)
at
com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.optimize(JavaToJavaScriptCompiler.java:
709)
at
com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.precompile(JavaToJavaScriptCompiler.java:
635)
at
com.google.gwt.dev.jjs.JavaScriptCompiler.precompile(JavaScriptCompiler.java:
35)
at com.google.gwt.dev.Precompile.precompile(Precompile.java:541)
at com.google.gwt.dev.Precompile.precompile(Precompile.java:495)
at com.google.gwt.dev.Precompile.precompile(Precompile.java:407)
at com.google.gwt.dev.Compiler.run(Compiler.java:215)
at com.google.gwt.dev.Compiler.run(Compiler.java:187)
at com.google.gwt.dev.Compiler$1.run(Compiler.java:159)
at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:
87)
at
com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:
81)
at com.google.gwt.dev.Compiler.main(Compiler.java:166)
Caused by: java.lang.NullPointerException
at com.google.gwt.dev.jjs.impl.ControlFlowAnalyzer
$RescueVisitor.visit(ControlFlowAnalyzer.java:205)
at com.google.gwt.dev.jjs.ast.JClassType.traverse(JClassType.java:60)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:124)
... 67 more
[ERROR] at ArithmeticException.java(26): final class
ArithmeticException extends RuntimeException
com.google.gwt.dev.jjs.ast.JClassType
[ERROR] at LongLibBase.java(118): new ArithmeticException()
com.google.gwt.dev.jjs.ast.JNewInstance
[ERROR] at LongLibBase.java(118): throw new
ArithmeticException()
com.google.gwt.dev.jjs.ast.JThrowStatement
[ERROR] at LongLibBase.java(117): {
throw new ArithmeticException();
}
com.google.gwt.dev.jjs.ast.JBlock
[ERROR] at LongLibBase.java(117): if (LongLibBase.getLNative(b)
== 0 && LongLibBase.getMNative(b) == 0 && LongLibBase.getHNative(b) ==
0) {
throw new ArithmeticException();
}
com.google.gwt.dev.jjs.ast.JIfStatement
[ERROR] at LongLibBase.java(115): {
if (LongLibBase.getLNative(b) == 0 && LongLibBase.getMNative(b) == 0
&& LongLibBase.getHNative(b) == 0) {
throw new ArithmeticException();
}
if (LongLibBase.getLNative(a) == 0 && LongLibBase.getMNative(a) == 0
&& LongLibBase.getHNative(a) == 0) {
computeRemainder && (LongLibBase.remainder =
LongLibBase.create0(0, 0, 0));
return LongLibBase.create0(0, 0, 0);
}
if (LongLibBase.getHNative(b) == 524288 && LongLibBase.getMNative(b)
== 0 && LongLibBase.getLNative(b) == 0) {
return LongLibBase.divModByMinValue(a, computeRemainder);
}
boolean negative = false;
if (LongLibBase.getHNative(b) >> 19 != 0) {
b = LongLib.neg(b);
negative = !negative;
}
final int bpower = LongLibBase.powerOfTwo(b);
boolean aIsNegative = false;
boolean aIsMinValue = false;
boolean aIsCopy = false;
if (LongLibBase.getHNative(a) == 524288 && LongLibBase.getMNative(a)
== 0 && LongLibBase.getLNative(a) == 0) {
aIsMinValue = true;
aIsNegative = true;
if (bpower == -1) {
a = LongLibBase.create(LongLib$Const.MAX_VALUE);
aIsCopy = true;
negative = !negative;
} else {
final LongLibBase$LongEmul c = LongLib.shr(a, bpower);
negative && LongLibBase.negate(c);
computeRemainder && (LongLibBase.remainder =
LongLibBase.create0(0, 0, 0));
return c;
}
} else if (LongLibBase.getHNative(a) >> 19 != 0) {
aIsNegative = true;
a = LongLib.neg(a);
aIsCopy = true;
negative = !negative;
}
if (bpower != -1) {
return LongLibBase.divModByShift(a, bpower, negative, aIsNegative,
computeRemainder);
}
if (!LongLib.gte(a, b)) {
computeRemainder && (aIsNegative ? (LongLibBase.remainder =
LongLib.neg(a)) : (LongLibBase.remainder =
LongLibBase.create0(LongLibBase.getLNative(a),
LongLibBase.getMNative(a), LongLibBase.getHNative(a))));
return LongLibBase.create0(0, 0, 0);
}
return LongLibBase.divModHelper(aIsCopy ? a :
LongLibBase.create0(LongLibBase.getLNative(a),
LongLibBase.getMNative(a), LongLibBase.getHNative(a)), b, negative,
aIsNegative, aIsMinValue, computeRemainder);
}
com.google.gwt.dev.jjs.ast.JBlock
[ERROR] at LongLibBase.java(115): {
if (LongLibBase.getLNative(b) == 0 && LongLibBase.getMNative(b) == 0
&& LongLibBase.getHNative(b) == 0) {
throw new ArithmeticException();
}
if (LongLibBase.getLNative(a) == 0 && LongLibBase.getMNative(a) == 0
&& LongLibBase.getHNative(a) == 0) {
computeRemainder && (LongLibBase.remainder =
LongLibBase.create0(0, 0, 0));
return LongLibBase.create0(0, 0, 0);
}
if (LongLibBase.getHNative(b) == 524288 && LongLibBase.getMNative(b)
== 0 && LongLibBase.getLNative(b) == 0) {
return LongLibBase.divModByMinValue(a, computeRemainder);
}
boolean negative = false;
if (LongLibBase.getHNative(b) >> 19 != 0) {
b = LongLib.neg(b);
negative = !negative;
}
final int bpower = LongLibBase.powerOfTwo(b);
boolean aIsNegative = false;
boolean aIsMinValue = false;
boolean aIsCopy = false;
if (LongLibBase.getHNative(a) == 524288 && LongLibBase.getMNative(a)
== 0 && LongLibBase.getLNative(a) == 0) {
aIsMinValue = true;
aIsNegative = true;
if (bpower == -1) {
a = LongLibBase.create(LongLib$Const.MAX_VALUE);
aIsCopy = true;
negative = !negative;
} else {
final LongLibBase$LongEmul c = LongLib.shr(a, bpower);
negative && LongLibBase.negate(c);
computeRemainder && (LongLibBase.remainder =
LongLibBase.create0(0, 0, 0));
return c;
}
} else if (LongLibBase.getHNative(a) >> 19 != 0) {
aIsNegative = true;
a = LongLib.neg(a);
aIsCopy = true;
negative = !negative;
}
if (bpower != -1) {
return LongLibBase.divModByShift(a, bpower, negative, aIsNegative,
computeRemainder);
}
if (!LongLib.gte(a, b)) {
computeRemainder && (aIsNegative ? (LongLibBase.remainder =
LongLib.neg(a)) : (LongLibBase.remainder =
LongLibBase.create0(LongLibBase.getLNative(a),
LongLibBase.getMNative(a), LongLibBase.getHNative(a))));
return LongLibBase.create0(0, 0, 0);
}
return LongLibBase.divModHelper(aIsCopy ? a :
LongLibBase.create0(LongLibBase.getLNative(a),
LongLibBase.getMNative(a), LongLibBase.getHNative(a)), b, negative,
aIsNegative, aIsMinValue, computeRemainder);
}
com.google.gwt.dev.jjs.ast.JMethodBody
[ERROR] at LongLibBase.java(115): public static final LongLibBase
$LongEmul divMod(LongLibBase$LongEmul a, LongLibBase$LongEmul b,
boolean computeRemainder);
com.google.gwt.dev.jjs.ast.JMethod
[ERROR] at LongLib.java(77): LongLibBase.divMod(a, b, false)
com.google.gwt.dev.jjs.ast.JMethodCall
[ERROR] at LongLib.java(77): return LongLibBase.divMod(a, b,
false)
com.google.gwt.dev.jjs.ast.JReturnStatement
[ERROR] at LongLib.java(76): {
return LongLibBase.divMod(a, b, false);
}
com.google.gwt.dev.jjs.ast.JBlock
[ERROR] at LongLib.java(76): {
return LongLibBase.divMod(a, b, false);
}
com.google.gwt.dev.jjs.ast.JMethodBody
[ERROR] at LongLib.java(76): public static final LongLibBase
$LongEmul div(LongLibBase$LongEmul a, LongLibBase$LongEmul b);
com.google.gwt.dev.jjs.ast.JMethod
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