PyV8 debugger not properly handling break events

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While playing with PyV8 debugger I identified an issue. As you can easily 
realize from the attached test code, the command line argument is used to 
enable/disable the Debugger onMessage method. If the code is executed with 
onMessage method disabled, nothing happens after the BeforeCompile/AfterCompile 
events. This should be a bug because a break event is generated but not handled 
by the Debugger class methods.


buffer@alnitak ~ $ python DebuggerTest.py 0
BeforeCompile event: 
{"seq":0,"type":"event","event":"beforeCompile","success":true,"body":{"script":

{"handle":1,"type":"script","id":17,"lineOffset":0,"columnOffset":0,"lineCount":
14,"sourceStart":"\nfunction my_func(t)\n{\n\tvar s = \"foo\";\n\tvar i = 
0;\n\n\tfor (i = 0; i < 3; i++) 
{\n\t","sourceLength":120,"scriptType":2,"compilationType":0,"context":{"ref":0}
,"text":" (lines: 
14)"}},"refs":[{"handle":0,"type":"context","text":"#<ContextMirror>"}],"running
":true}
AfterCompile event: 
{"seq":2,"type":"event","event":"afterCompile","success":true,"body":{"script":{
"handle":1,"type":"script","id":17,"lineOffset":0,"columnOffset":0,"lineCount":1
4,"sourceStart":"\nfunction my_func(t)\n{\n\tvar s = \"foo\";\n\tvar i = 
0;\n\n\tfor (i = 0; i < 3; i++) 
{\n\t","sourceLength":120,"scriptType":2,"compilationType":0,"context":{"ref":0}
,"text":" (lines: 
14)"}},"refs":[{"handle":0,"type":"context","text":"#<ContextMirror>"}],"running
":true}
[hanging here]


Taking a look at what happens when the onMessage is enabled, we can see that 
the break event is properly generated so it seems not to be handled as stated 
before.


buffer@alnitak ~ $ python DebuggerTest.py 1
BeforeCompile event: 
{"seq":0,"type":"event","event":"beforeCompile","success":true,"body":{"script":
{"handle":1,"type":"script","id":17,"lineOffset":0,"columnOffset":0,"lineCount":
14,"sourceStart":"\nfunction my_func(t)\n{\n\tvar s = \"foo\";\n\tvar i = 
0;\n\n\tfor (i = 0; i < 3; i++) 
{\n\t","sourceLength":120,"scriptType":2,"compilationType":0,"context":{"ref":0}
,"text":" (lines: 
14)"}},"refs":[{"handle":0,"type":"context","text":"#<ContextMirror>"}],"running
":true}
Debug message: {u'body': {u'script': {u'columnOffset': 0, u'handle': 1, 
u'compilationType': 0, u'text': u' (lines: 14)', u'sourceLength': 120, 
u'sourceStart': u'\nfunction my_func(t)\n{\n\tvar s = "foo";\n\tvar i = 
0;\n\n\tfor (i = 0; i < 3; i++) {\n\t', u'lineCount': 14, u'scriptType': 2, 
u'lineOffset': 0, u'context': {u'ref': 0}, u'type': u'script', u'id': 17}}, 
u'seq': 1, u'success': True, u'refs': [{u'type': u'context', u'handle': 0, 
u'text': u'#<ContextMirror>'}], u'running': True, u'type': u'event', u'event': 
u'afterCompile'}
AfterCompile event: 
{"seq":2,"type":"event","event":"afterCompile","success":true,"body":{"script":{
"handle":1,"type":"script","id":17,"lineOffset":0,"columnOffset":0,"lineCount":1
4,"sourceStart":"\nfunction my_func(t)\n{\n\tvar s = \"foo\";\n\tvar i = 
0;\n\n\tfor (i = 0; i < 3; i++) 
{\n\t","sourceLength":120,"scriptType":2,"compilationType":0,"context":{"ref":0}
,"text":" (lines: 
14)"}},"refs":[{"handle":0,"type":"context","text":"#<ContextMirror>"}],"running
":true}
Debug message: {u'body': {u'invocationText': u'[anonymous]()', u'script': 
{u'lineCount': 14, u'columnOffset': 0, u'id': 17, u'lineOffset': 0, u'name': 
u''}, u'sourceLineText': u'', u'sourceColumn': 0, u'sourceLine': 0}, u'type': 
u'event', u'event': u'break', u'seq': 3}
[hanging here]

Regards,
Angelo

Original issue reported on code.google.com by [email protected] on 13 Jun 2011 at 2:11

Attachments:

• DebuggerTest.py