VM service getObject response for scripts no longer include "source" for SDK libraries in v2.10 dev SDKs

[DanTup]

When using a Dart v2.10 dev SDK, the "source" property appears to be missing from the response of getObject call to the VM Service for dart:core/print.dart.

Left is v2.9, right is v2.10.0-56.0.dev.

We use this in VS Code when the user steps into SDK libraries (otherwise the user will just see <source not available>).

cc @bkonyi

[DanTup]

@bkonyi do you know if this is an intended change or a bug? I've been noticing it a lot more the last few days while debugging using nightly SDK builds, it's much more difficult to debug things.

[bkonyi]

No, that's not intended. It's possible someone was messing with build rules or how the platform snapshot is linked in and managed to remove it. I'll have to take a look.

[bkonyi]

Was this a Flutter application? Is this still an issue? I'm unable to reproduce with the standalone VM.

[DanTup]

It was just Dart. I can repro using the most recently nightly from http://gsdview.appspot.com/dart-archive/channels/be/raw/latest/sdk/:

Dart SDK version: 2.10.0-edge.ca25787ad4fa0a6429679e38bec272957e0445b6 (be) (Thu Sep 3 16:55:25 2020 +0000) on "macos_x64"

I created a simple script that used print() then tried to step into it:

[6:27:02 PM] [VmService] ==> {"id":"44","jsonrpc":"2.0","method":"resume","params":{"isolateId":"isolates/818684413507763","step":"Into"}}
[6:27:02 PM] [VmService] <== {"jsonrpc":"2.0","result":{"type":"Success"},"id":"44"}
[6:27:02 PM] [VmService] <== {"jsonrpc":"2.0","method":"streamNotify","params":{"streamId":"Debug","event":{"type":"Event","kind":"Resume","isolate":{"type":"@Isolate","id":"isolates/818684413507763","name":"main","number":"818684413507763","isSystemIsolate":false},"timestamp":1599154022005,"topFrame":{"type":"Frame","kind":"Regular","location":{"type":"SourceLocation","script":{"type":"@Script","fixedId":true,"id":"libraries/@19027873/scripts/file%3A%2F%2F%2FUsers%2Fdanny%2FDesktop%2Fdart_sample%2Fbin%2Fmain.dart/1745501d02d","uri":"file:///Users/danny/Desktop/dart_sample/bin/main.dart","_kind":"kernel"},"tokenPos":211},"function":{"type":"@Function","fixedId":true,"id":"libraries/@19027873/closures/10","name":"async_op","_vmName":":async_op","owner":{"type":"@Function","fixedId":true,"id":"libraries/@19027873/functions/main","name":"main","owner":{"type":"@Library","fixedId":true,"id":"libraries/@19027873","name":"","uri":"file:///Users/danny/Desktop/dart_sample/bin/main.dart"},"_kind":"RegularFunction","static":true,"const":false,"_intrinsic":false,"_native":false},"_kind":"ClosureFunction","static":true,"const":false,"_intrinsic":false,"_native":false},"code":{"type":"@Code","fixedId":true,"id":"code/81b725e21-111aa5480","name":"[Unoptimized] main","_vmName":"[Unoptimized] async_op","kind":"Dart","_optimized":false,"_intrinsic":false,"_native":false},"vars":[{"type":"BoundVariable","name":"danny","value":{"type":"@Instance","_vmType":"String","class":{"type":"@Class","fixedId":true,"id":"classes/81","name":"_OneByteString","_vmName":"_OneByteString@0150898"},"kind":"String","id":"objects/27","length":4,"valueAsString":"test"},"declarationTokenPos":177,"scopeStartTokenPos":184,"scopeEndTokenPos":211}],"index":0}}}}
[6:27:02 PM] [VmService] <== {"jsonrpc":"2.0","method":"streamNotify","params":{"streamId":"Debug","event":{"type":"Event","kind":"PauseBreakpoint","isolate":{"type":"@Isolate","id":"isolates/818684413507763","name":"main","number":"818684413507763","isSystemIsolate":false},"timestamp":1599154022006,"pauseBreakpoints":[],"topFrame":{"type":"Frame","kind":"Regular","location":{"type":"SourceLocation","script":{"type":"@Script","fixedId":true,"id":"libraries/@15069316/scripts/dart%3Aio%2Fdirectory.dart/0","uri":"dart:io/directory.dart","_kind":"kernel"},"tokenPos":5230},"function":{"type":"@Function","fixedId":true,"id":"classes/941/functions/get%3Acurrent","name":"current","_vmName":"get:current","owner":{"type":"@Class","fixedId":true,"id":"classes/941","name":"Directory"},"_kind":"GetterFunction","static":true,"const":false,"_intrinsic":false,"_native":false},"code":{"type":"@Code","fixedId":true,"id":"code/81bc8e8a5-111aa8b60","name":"[Unoptimized] Directory.current","_vmName":"[Unoptimized] current","kind":"Dart","_optimized":false,"_intrinsic":false,"_native":false},"vars":[],"index":0}}}}
[6:27:02 PM] [VmService] ==> {"id":"45","jsonrpc":"2.0","method":"getStack","params":{"isolateId":"isolates/818684413507763"}}
[6:27:02 PM] [VmService] <== {"jsonrpc":"2.0","result":{"type":"Stack","frames":[{"type":"Frame","kind":"Regular","location":{"type":"SourceLocation","script":{"type":"@Script","fixedId":true,"id":"libraries/@15069316/scripts/dart%3Aio%2Fdirectory.dart/0","uri":"dart:io/directory.dart","_kind":"kernel"},"tokenPos":5230},"function":{"type":"@Function","fixedId":true,"id":"classes/941/functions/get%3Acurrent","name":"current","_vmName":"get:current","owner":{"type":"@Class","fixedId":true,"id":"classes/941","name":"Directory"},"_kind":"GetterFunction","static":true,"const":false,"_intrinsic":false,"_native":false},"code":{"type":"@Code","fixedId":true,"id":"code/81bc8e8a5-111aa8b60","name":"[Unoptimized] Directory.current","_vmName":"[Unoptimized] current","kind":"Dart","_optimized":false,"_intrinsic":false,"_native":false},"vars":[],"index":0},{"type":"Frame","kind":"Regular","location":{"type":"SourceLocation","script":{"type":"@Script","fixedId":true,"id":"libraries/@19027873/scripts/file%3A%2F%2F%2FUsers%2Fdanny%2FDesktop%2Fdart_sample%2Fbin%2Fmain.dart/1745501d02d","uri":"file:///Users/danny/Desktop/dart_sample/bin/main.dart","_kind":"kernel"},"tokenPos":211},"function":{"type":"@Function","fixedId":true,"id":"libraries/@19027873/closures/10","name":"async_op","_vmName":":async_op","owner":{"type":"@Function","fixedId":true,"id":"libraries/@19027873/functions/main","name":"main","owner":{"type":"@Library","fixedId":true,"id":"libraries/@19027873","name":"","uri":"file:///Users/danny/Desktop/dart_sample/bin/main.dart"},"_kind":"RegularFunction","static":true,"const":false,"_intrinsic":false,"_native":false},"_kind":"ClosureFunction","static":true,"const":false,"_intrinsic":false,"_native":false},"code":{"type":"@Code","fixedId":true,"id":"code/81b725e21-111aa5480","name":"[Unoptimized] 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[6:27:02 PM] [VmService] ==> {"id":"46","jsonrpc":"2.0","method":"getObject","params":{"isolateId":"isolates/818684413507763","objectId":"libraries/@15069316/scripts/dart%3Aio%2Fdirectory.dart/0"}}
[6:27:02 PM] [VmService] <== {"jsonrpc":"2.0","result":{"type":"Script","class":{"type":"@Class","fixedId":true,"id":"classes/12","name":"Script"},"size":96,"fixedId":true,"id":"libraries/@15069316/scripts/dart%3Aio%2Fdirectory.dart/0","uri":"dart:io/directory.dart","_kind":"kernel","_loadTime":0,"library":{"type":"@Library","fixedId":true,"id":"libraries/@15069316","name":"dart.io","uri":"dart:io"},"lineOffset":0,"columnOffset":0,"tokenPosTable":[[109,4038,1],[114,4171,3,4182,14,4186,18],[125,4496,4],[126,4523,3,4531,11,4540,20,4548,28],[127,4579,24,4589,34,4603,48],[128,4616,5,4620,9,4630,19],[129,4647,7,4658,18,4669,29],[131,4686,5,4693,12,4703,22,4719,38],[132,4728,3],[134,4734,4],[135,4761,3,4769,11,4790,32,4801,43],[137,4852,5,4863,16,4886,39],[138,4895,3],[145,5035,3,5043,11,5060,28,5065,33,5073,41,5077,45,5087,55,5091,59,5104,72],[151,5201,3,5222,24,5230,32],[152,5255,24,5265,34,5279,48],[153,5292,5,5296,9,5306,19],[154,5323,7,5341,25],[156,5360,5,5367,12,5377,22],[157,5402,3],[166,5668,3,5676,11,5679,14],[186,6462,3,6478,19,6485,26,6486,27],[187,6517,24,6527,34,6541,48],[188,6554,5,6558,9,6568,19],[189,6596,18,6606,28],[190,6618,7],[192,6636,5,6646,15,6666,35],[193,6675,3],[206,7135,3,7153,21,7159,27,7166,34,7177,45,7184,52],[217,7539,3,7544,8,7554,18,7561,25,7572,36,7579,43],[227,7867,3,7888,24,7899,35],[228,7924,24,7934,34,7948,48],[229,7961,5,7965,9,7975,19],[230,7992,7,8010,25],[232,8032,5,8039,12,8049,22],[233,8077,3],[244,8430,3,8448,21,8458,31,8468,41,8476,49],[254,8794,3,8804,13,8818,27,8828,37,8836,45],[256,8841,3,8856,18,8876,38,8878,40],[258,8883,3,8890,10,8914,34,8916,36],[268,9266,3,9284,21,9290,27,9298,35,9306,43],[278,9609,3,9619,13,9629,23,9637,31,9645,39],[287,9898,3,9912,17,9920,25],[309,10764,3,10789,28,10793,32],[310,10807,13,10818,24,10830,36,10843,49,10849,55],[332,11686,3,11709,26,11717,34],[333,11731,13,11742,24,11754,36,11767,49,11773,55],[338,11856,3,11863,10,11871,18,11873,20],[339,11875,1]]},"id":"46"}

The last line is the response to calling getObject with the script ID, and it's missing the source still. I don't know if it's specific to the nightlies, but it was causing my integration tests to fail (which use Dev builds) too (I haven't re-enabled them yet though).

[bkonyi]

That's really strange... Can I trouble you to share your script and how you run it?

[DanTup]

Sure! I'm using VS Code, with two files:

bin/main.dart

main() {
  print('test'); // Breakpoint here
}

.vscode/settings.json

{
	"dart.sdkPath": "/Users/danny/Dev/Dart SDKs/nightly-2020-09-03", // Path to SDK here
	"dart.debugSdkLibraries": true,
	"dart.debugExternalLibraries": true,
	"dart.vmServiceLogFile": "logs/vmservice.txt",
}

• Open the folder parent of those folders in VS Code (so the .vscode and bin folders are both in the workspace)
• add a breakpoint on the marked line in bin/main.dart
• Press F5 to run and wait to hit the breakpoint
• Press F11 to step-into

You'd normally see source code, but you'll now see <source not available>. The VM service traffic will be logged into the logs folder so you can examine it.

[bkonyi]

Confirmed I can reproduce using VSCode and a local SDK build. I wonder if there's maybe two copies of these scripts reported and maybe that's what's causing the issue... I'll keep digging.

[DanTup]

Great! Let me know if you need me to test anything, or if you think I might be doing anything weird in VS Code to cause this. Thanks!

[bkonyi]

Fix up for review.

[DanTup]

Great, thanks!

[DanTup]

@bkonyi it seems like this still isn't working in the v2.10 release build:

{
	"jsonrpc": "2.0",
	"result": {
		"type": "Script",
		"class": {
			"type": "@Class",
			"fixedId": true,
			"id": "classes\/12",
			"name": "Script"
		},
		"size": 96,
		"fixedId": true,
		"id": "libraries\/@0150898\/scripts\/dart%3Acore%2Fprint.dart\/0",
		"uri": "dart:core\/print.dart",
		"_kind": "kernel",
		"_loadTime": 0,
		"library": {
			"type": "@Library",
			"fixedId": true,
			"id": "libraries\/@0150898",
			"name": "dart.core",
			"uri": "dart:core"
		},
		"lineOffset": 0,
		"columnOffset": 0,
		"tokenPosTable": [[8,302,1,307,6,312,11,321,20],[9,340,10,345,15,347,17,354,24],[10,372,7,379,14,381,16],[11,396,3,400,7,407,14],[12,422,5,437,20],[14,459,5,465,11,466,12],[16,477,1]]
	},
	"id": "97"
}

I created a script that called print() and stepped into it with the debugger, and that's the result from the getObject call.

[bkonyi]

It looks like this just missed the 2.10 branch (landed 26 days ago). 19875e9 landed 25 days ago :-(

[DanTup]

Oh, I see it. I saw some v2.10.0-dev tags on that change and assumed it was in. My bad, thanks!