Truffle: Debugger starts but cannot step through contract code

[hernandp]

Issue

Debugger starts up properly, displaying the first lines, but you can't step through contract code due to TypeError: Cannot read property 'line' of undefined.

Steps to Reproduce

• Start TestRPC with unlocked 0 account.
• Migrate a Crowdsale-type contract (I used an OpenZeppelin Crowdsale- derived one)
• Deploy your contract
• Send some ETH amount to the CS address
• Once transaction succeeds, debug it with Truffle.

Expected Behavior

Just traverse through code using step-out commands.

"Print instruction" works, however.

Actual Results

Debugger starts up properly, displaying the first lines,

SampleCrowdsale.sol | 0x70ca135e7738724d2876cf4d7615233f003c644a:

9: import './SampleToken.sol';
10: 
11: contract SampleCrowdsale is IcoPlatformCrowdsale {
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

but ultimately fails with:

TypeError: Cannot read property 'line' of undefined
    at Debugger.stepOver (/usr/local/lib/node_modules/truffle/build/cli.bundled.js:324748:64)
    at Object.interpreter (/usr/local/lib/node_modules/truffle/build/cli.bundled.js:319292:22)
    at ReplManager.interpret (/usr/local/lib/node_modules/truffle/build/cli.bundled.js:201603:18)
    at bound (domain.js:301:14)
    at REPLServer.runBound [as eval] (domain.js:314:12)
    at REPLServer.onLine (repl.js:440:10)
    at emitOne (events.js:115:13)
    at REPLServer.emit (events.js:210:7)
    at REPLServer.Interface._onLine (readline.js:282:10)
    at REPLServer.Interface._line (readline.js:631:8)

Environment

• Operating System: Ubuntu 17.10 AMD64
• Truffle version: 4.0.0
• Ethereum client: EthereumJS TestRPC v4.1.3 (ganache-core: 1.1.3)
• node version: 8.6.0
• npm version: 5.5.1

[timothywangdev]

happened to me as well.

[almindor]

Same, can't seem to step into an inherited call

[elie222]

Same here...

[veebuv]

Any solution to this ?

[stepanorda]

Same here

[nickjm]

Same. I've noticed it's not a problem with inheritance alone, but rather for contracts in separate files. I can temporarily fix the problem by making one big file with my contract and all it's parent contracts

[jstoeffler]

I have just one contract (aside from the Migrations) and I'm having the issue.

[jstoeffler]

Actually I'm having the same error in the same situation but with a different stack trace (Mac OS):

TypeError: Cannot read property 'line' of undefined
    at Object.formatRangeLines (/usr/local/lib/node_modules/truffle/build/webpack:/~/truffle-debug-utils/index.js:210:1)
    at printState (/usr/local/lib/node_modules/truffle/build/webpack:/~/truffle-core/lib/commands/debug.js:91:1)
    at /usr/local/lib/node_modules/truffle/build/webpack:/~/truffle-core/lib/commands/debug.js:194:1
    at /usr/local/lib/node_modules/truffle/build/webpack:/~/truffle-debugger/debugger.js:85:1
    at <anonymous>
    at process._tickDomainCallback (internal/process/next_tick.js:228:7)

[jstoeffler]

Here's how I fixed it:

1. Find the bundled cli file, in my case /usr/local/lib/node_modules/truffle/build/cli.bundled.js
2. Find the method in which the error occurs, in my case formatRangeLines: function(source, range, contextBefore)
3. Log the range object by adding a console.log(range); in the file and re-runnning it. In my case it was: { start: { line: 39, column: 0 }, end: undefined }
4. So range.end was undefined in my case, so I replaced:
   this line : if (range.start.line == range.end.line) { by this line: if (range.end && range.start.line == range.end.line) { (null/undefined check of range.end)

[elie222]

Can we get this merged into core?

On 2 Feb 2018 23:28, "jstoeffler" [e-mail] wrote:

Here's how I fixed it:

1. Find the bundled cli file, in my case /usr/local/lib/node_modules/
   truffle/build/cli.bundled.js
2. Find the method in which the error occurs, in my case formatRangeLines:
   function(source, range, contextBefore)
3. Log the range object by adding a console.log(range); in the file
   and re-runnning it. In my case it was: { start: { line: 39, column: 0
   }, end: undefined }
4. So range.end was undefined in my case, so I replaced:
   this line : if (range.start.line == range.end.line) { by this line: if
   (range.end && range.start.line == range.end.line) { (null/undefined
   check of range.end)

—
You are receiving this because you commented.
Reply to this email directly, view it on GitHub
https://github.com/trufflesuite/truffle/issues/655#issuecomment-362712777,
or mute the thread
https://github.com/notifications/unsubscribe-auth/AC8oX_e2_nifB8TC_D-j8pzrsI_gW28Zks5tQ33jgaJpZM4QOxLb
.

[jstoeffler]

I've created a PR: https://github.com/trufflesuite/truffle-debug-utils/pull/2

But it doesn't seem to solve OP's issue, which I think happens here : https://github.com/trufflesuite/truffle-debugger/blob/6aea5c57683bd6b68da712356fd6ab3539f1aac7/debugger.js#L351

[boorac]

@nickjm I can confirm your workaround works, I will open an issue regarding the bug.

[Robinyo]

I can also confirm @nickjm 's workaround works.

[diop]

I updated my version of Truffle to 4.1.0 and it solved the problem.

[Muhammad-Altabba]

In my case, I updated Truffle to 4.1.0 but still have the issue!
Digging into method "formatRangeLines: function(source, range, contextBefore)"
When "console.log(range);" it prints:
{ start: undefined, end: undefined }
Actually, the exception raised when accessing range.start at this block:

    var startBeforeIndex = Math.max(
      range.start.line - contextBefore, 0
    );

The full stacktrace of the error as shown at the Terminal is:

TypeError: Cannot read property 'line' of undefined
    at Object.formatRangeLines (/usr/local/lib/node_modules/truffle/build/webpack:/~/truffle-debug-utils/index.js:201:1)
    at printState (/usr/local/lib/node_modules/truffle/build/webpack:/~/truffle-core/lib/commands/debug.js:125:1)
    at Object.interpreter (/usr/local/lib/node_modules/truffle/build/webpack:/~/truffle-core/lib/commands/debug.js:404:1)
    at ReplManager.interpret (/usr/local/lib/node_modules/truffle/build/webpack:/~/truffle-core/lib/repl.js:119:1)
    at bound (domain.js:280:14)
    at REPLServer.runBound [as eval] (domain.js:293:12)
    at REPLServer.<anonymous> (repl.js:539:10)
    at emitOne (events.js:96:13)
    at REPLServer.emit (events.js:188:7)
    at REPLServer.Interface._onLine (readline.js:232:10)
    at REPLServer.Interface._line (readline.js:583:8)
    at REPLServer.Interface._ttyWrite (readline.js:860:14)
    at REPLServer.self._ttyWrite (repl.js:612:7)
    at ReadStream.onkeypress (readline.js:119:10)
    at emitTwo (events.js:106:13)
    at ReadStream.emit (events.js:191:7)
    at emitKeys (internal/readline.js:389:14)
    at next (native)
    at ReadStream.onData (readline.js:970:36)
    at emitOne (events.js:96:13)
    at ReadStream.emit (events.js:188:7)
    at readableAddChunk (_stream_readable.js:176:18)
    at ReadStream.Readable.push (_stream_readable.js:134:10)
    at TTY.onread (net.js:547:20)

Any suggestions?
Thanks,

[boorac]

@Muhammad-Altabba are you debugging across multiple files? If so, check out this issue:
https://github.com/trufflesuite/truffle/issues/826

[Muhammad-Altabba]

Yes, thanks.

[gnidan]

Thanks for bringing up this issue. I think the root cause here is mostly around the debugger's support for multiple files. This should be going out under the work of trufflesuite/truffle-debugger#39.

Closing this as duplicate. Let me know if problems persist!

[chupd]

Same here.
my truffle version is v 4.1.5.
but still have the issue!

debug(develop:0x070e447c...)> o
redux-saga error: uncaught at session.saga
at session.saga
 at controller.saga
 at stepOver
 TypeError: Cannot read property 'line' of undefined
    at /usr/local/lib/node_modules/truffle/build/webpack:/~/truffle-debugger/dist/debugger.js:610:1
    at /usr/local/lib/node_modules/truffle/build/webpack:/~/reselect/lib/index.js:76:1
    at /usr/local/lib/node_modules/truffle/build/webpack:/~/reselect/lib/index.js:36:1
    at /usr/local/lib/node_modules/truffle/build/webpack:/~/reselect/lib/index.js:90:1
    at /usr/local/lib/node_modules/truffle/build/webpack:/~/reselect/lib/index.js:36:1
    at /usr/local/lib/node_modules/truffle/build/webpack:/~/reselect/lib/index.js:86:1
    at /usr/local/lib/node_modules/truffle/build/webpack:/~/reselect/lib/index.js:36:1
    at /usr/local/lib/node_modules/truffle/build/webpack:/~/reselect/lib/index.js:86:1
    at /usr/local/lib/node_modules/truffle/build/webpack:/~/reselect/lib/index.js:36:1
    at runSelectEffect (/usr/local/lib/node_modules/truffle/build/webpack:/~/redux-saga/es/internal/proc.js:698:1)
    at runEffect (/usr/local/lib/node_modules/truffle/build/webpack:/~/redux-saga/es/internal/proc.js:435:1)
    at next (/usr/local/lib/node_modules/truffle/build/webpack:/~/redux-saga/es/internal/proc.js:315:1)
    at currCb (/usr/local/lib/node_modules/truffle/build/webpack:/~/redux-saga/es/internal/proc.js:388:1)
    at takeCb (/usr/local/lib/node_modules/truffle/build/webpack:/~/redux-saga/es/internal/proc.js:466:1)
    at Object.put (/usr/local/lib/node_modules/truffle/build/webpack:/~/redux-saga/es/internal/channel.js:73:1)
    at /usr/local/lib/node_modules/truffle/build/webpack:/~/redux-saga/es/internal/channel.js:161:1
    at Array.<anonymous> (/usr/local/lib/node_modules/truffle/build/webpack:/~/redux-saga/es/internal/channel.js:182:1)
    at Object.emit (/usr/local/lib/node_modules/truffle/build/webpack:/~/redux-saga/es/internal/channel.js:26:1)
    at /usr/local/lib/node_modules/truffle/build/webpack:/~/redux-saga/es/internal/middleware.js:67:1
    at dispatch (/usr/local/lib/node_modules/truffle/build/webpack:/~/redux/es/applyMiddleware.js:35:1)
    at /usr/local/lib/node_modules/truffle/build/webpack:/~/redux-saga/es/internal/utils.js:250:1
    at /usr/local/lib/node_modules/truffle/build/webpack:/~/redux-saga/es/internal/proc.js:489:1
    at exec (/usr/local/lib/node_modules/truffle/build/webpack:/~/redux-saga/es/internal/scheduler.js:19:1)
    at flush (/usr/local/lib/node_modules/truffle/build/webpack:/~/redux-saga/es/internal/scheduler.js:60:1)
    at asap (/usr/local/lib/node_modules/truffle/build/webpack:/~/redux-saga/es/internal/scheduler.js:33:1)
    at Array.<anonymous> (/usr/local/lib/node_modules/truffle/build/webpack:/~/redux-saga/es/internal/channel.js:185:1)
    at Object.emit (/usr/local/lib/node_modules/truffle/build/webpack:/~/redux-saga/es/internal/channel.js:26:1)
    at Object.dispatch (/usr/local/lib/node_modules/truffle/build/webpack:/~/redux-saga/es/internal/middleware.js:67:1)
    at Session.dispatch (/usr/local/lib/node_modules/truffle/build/webpack:/~/truffle-debugger/dist/debugger.js:2683:1)
    at Session.stepOver (/usr/local/lib/node_modules/truffle/build/webpack:/~/truffle-debugger/dist/debugger.js:2705:1)
    at Object.interpreter (/usr/local/lib/node_modules/truffle/build/webpack:/~/truffle-core/lib/commands/debug.js:349:1)
    at ReplManager.interpret (/usr/local/lib/node_modules/truffle/build/webpack:/~/truffle-core/lib/repl.js:119:1)
    at bound (domain.js:301:14)
    at REPLServer.runBound [as eval] (domain.js:314:12)