minfrog throws node.js exception when compiling program that instantiates BlobBuilder

[DartBot]

This issue was originally filed by jeffbailey@google.com

---

What steps will reproduce the problem?

1. Make a test.dart that looks like so:

import('dart:dom', prefix:'dom');

main() {
  var bb = new dom.BlobBuilder();
}

1. Compile it like so:

minfrog --compile-only --out=/tmp/foo.js test.dart

1. ...
2. Profit!!!

What is the expected output? What do you see instead?

I expect it to compile. Instead I get:

node.js:201
        throw e; // process.nextTick error, or 'error' event on first tick
              ^
NullPointerException
    (TypeError: Cannot call method 'getConstructor' of null)
    at MethodAnalyzer.visitNewExpression (/home/jeffbailey/Programming/gclienttree/dart/dart/frog/minfrog:2490:16)
    at NewExpression.visit (/home/jeffbailey/Programming/gclienttree/dart/dart/frog/minfrog:11086:18)
    at MethodAnalyzer.visitValue (/home/jeffbailey/Programming/gclienttree/dart/dart/frog/minfrog:2101:20)
    at MethodAnalyzer.visitVariableDefinition (/home/jeffbailey/Programming/gclienttree/dart/dart/frog/minfrog:2169:22)
    at VariableDefinition.visit (/home/jeffbailey/Programming/gclienttree/dart/dart/frog/minfrog:10800:18)
    at MethodAnalyzer._visitAllStatements (/home/jeffbailey/Programming/gclienttree/dart/dart/frog/minfrog:2303:10)
    at MethodAnalyzer.visitBlockStatement (/home/jeffbailey/Programming/gclienttree/dart/dart/frog/minfrog:2308:8)
    at BlockStatement.visit (/home/jeffbailey/Programming/gclienttree/dart/dart/frog/minfrog:10963:18)
    at MethodAnalyzer.<anonymous> (/home/jeffbailey/Programming/gclienttree/dart/dart/frog/minfrog:2046:36)
    at MethodData.analyze (/home/jeffbailey/Programming/gclienttree/dart/dart/frog/minfrog:7103:6)

What version of the product are you using? On what operating system?

Trunk version, updated a few minutes ago on Goobuntu laptop.

Please provide any additional information below.

[DartBot]

This comment was originally written by jeffbailey@google.com

---

Changed the title to: "minfrog throws node.js exception when compiling program that instantiates BlobBuilder".

[DartBot]

This comment was originally written by ngeoffray@google.com

---

Will take a look, thanks Jeff for the bug report.

---

Added Area-Frog, Started labels.

[DartBot]

This comment was originally written by ngeoffray@google.com

---

The NPE problem should be fixed in https://chromiumcodereview.appspot.com//9463006. But please not that BlobBuilder does not exist in dart:dom, you should use WebKitBlobBuilder.

---

Added Fixed label.

[DartBot]

This comment was originally written by jeffbailey@google.com

---

Hmm. I'd been trying BlobBuilder because var bb = new dom.WebKitBlobBuilder() gives me test.dart:4:12: error: no matching constructor for dom_WebKitBlobBuilder

Is that a separate bug, or am I doing it wrong? I'm trying to mimic the instructions on the HTML5Rocks site: http://www.html5rocks.com/en/tutorials/file/filesystem/

Thanks!

[DartBot]

This comment was originally written by ngeoffray@google.com

---

What gives you these error messages? I am compiling the following program with frog (bleeding edge version), and I don't get any error:

#import('dart:dom', prefix: 'dom');
main() {
  print(new dom.WebKitBlobBuilder());
}

[DartBot]

This comment was originally written by jeffbailey@google.com

---

Looks like this is also fixed on the bleeding_edge branch:

jeffbailey@cirrostratus:/Programming/gittree/nethack-nacl/win/nacl-messages$ minfrog --compile-only --out=/tmp/foo.js test.dart
test.dart:4:12: warning: no matching constructor for dom_WebKitBlobBuilder
  var bb = new WebKitBlobBuilder();
           ^^^^^^^^^^^^^^^^^^^^^^^
test.dart:4:12: error: no matching constructor for dom_WebKitBlobBuilder
  var bb = new WebKitBlobBuilder();
           ^^^^^^^^^^^^^^^^^^^^^^^
compilation failed with 1 errors
jeffbailey@cirrostratus:/Programming/gittree/nethack-nacl/win/nacl-messages$ export DART=/home/jeffbailey/Programming/gclienttree/dart-bleeding/dart/frog/
jeffbailey@cirrostratus:/Programming/gittree/nethack-nacl/win/nacl-messages$ export PATH=/home/jeffbailey/Programming/gclienttree/dart-bleeding/dart/frog/:/home/jeffbailey/Programming/svntree/naclports/src//toolchain/linux_x86_newlib/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
jeffbailey@cirrostratus:/Programming/gittree/nethack-nacl/win/nacl-messages$ minfrog --compile-only --out=/tmp/foo.js test.dart
Compilation succeded. Code generated in: /tmp/foo.js