Bug 134276

Summary: Provide javascript aware backtrace script for lldb
Product: WebKit Reporter: Michael Saboff <msaboff>
Component: Tools / TestsAssignee: Michael Saboff <msaboff>
Status: RESOLVED FIXED    
Severity: Normal CC: bunhere, cdumez, commit-queue, gyuyoung.kim, sergio
Priority: P2    
Version: 528+ (Nightly build)   
Hardware: All   
OS: All   
Bug Depends on: 134278    
Bug Blocks:    
Attachments:
Description Flags
Patch jer.noble: review+

Michael Saboff
Reported 2014-06-24 15:53:39 PDT
lldb provides the ability to augment lldb functionality via python scripts. This can be used to make backtraces JavaScript aware. Consider the backtrace while running deltablue.js from jsc: (lldb) bt * thread #1: tid = 0x2c103b, 0x000025c288a61720, queue = 'com.apple.main-thread, stop reason = signal SIGSTOP frame #0: 0x000025c288a61720 frame #1: 0x000025c288a57c40 frame #2: 0x000025c288a6e050 frame #3: 0x000025c288a5d654 frame #4: 0x0000000100647550 JavaScriptCore`llint_entry + 25930 frame #5: 0x0000000100640d94 JavaScriptCore`callToJavaScript + 356 ... A more informative backtrace could be: (lldb) bt * thread \#1: tid = 0x2c103b, 0x000025c288a61720, queue = 'com.apple.main-thread, stop reason = signal SIGSTOP frame #0: 0x000025c288a61720 chooseMethod#EmCrCd [DFG](Cell[Object ID: 448]: 0x10994ca70, 97) frame #1: 0x000025c288a57c40 satisfy#A7Z1GK [FTL](Cell[Object ID: 448]: 0x10994ca70, 97) frame #2: 0x000025c288a6e050 chainTest#BRCzIm [DFG](Cell[global ID: 353]: 0x101cdf970, 100) frame #3: 0x000025c288a5d654 deltaBlue#DNE2LT [Baseline](Cell[global ID: 353]: 0x101cdf970) frame #4: 0x0000000100647550 <global>#AxbsUM [LLInt](Cell[JSProxy ID: 322]: 0x101cffb90) frame #5: 0x0000000100640d94 JavaScriptCore`callToJavaScript + 356 ...
Attachments
Patch (3.32 KB, patch)
2014-06-25 10:27 PDT, Michael Saboff 		jer.noble: review+
DetailsFormatted DiffDiff
View All Add attachment proposed patch, testcase, etc.
Michael Saboff
Comment 1 2014-06-25 10:27:16 PDT
Created attachment 233823 [details] Patch
WebKit Commit Bot
Comment 2 2014-06-25 10:28:48 PDT
Attachment 233823 [details] did not pass style-queue: ERROR: Tools/lldb/lldb_webkit.py:101: expected 2 blank lines, found 1 [pep8/E302] [5] ERROR: Tools/lldb/lldb_webkit.py:127: trailing whitespace [pep8/W291] [5] Total errors found: 2 in 2 files If any of these errors are false positives, please file a bug against check-webkit-style.
Jer Noble
Comment 3 2014-06-25 10:31:31 PDT
Comment on attachment 233823 [details] Patch nice! r=me.
Michael Saboff
Comment 4 2014-06-25 10:36:46 PDT
Committed r170432: <http://trac.webkit.org/changeset/170432>
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