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Home Run by Vincent, David
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1Home Run Derby Field Announced
By John Gregory
This year's derby will have a different format, with players facing off in one-on-one matchups The heavy hitters in Major League Baseball's Home Run Derby are set--and for the first time, the derby could come down to two teammates. Two Chicago Cubs are among the 8 competing in the Derby---first baseman Anthony Rizzo and third baseman Kris Bryant. But Bryant says they're not going to make any bets on who makes it further... CUT . Bryant will have to beat L-A Angels first baseman Albert Pujols to advance. Rizzo will be taking on Toronto Blue Jays third baseman Josh Donaldson. The other matchups are L-A Dodgers center fielder Joc Pederson versus Baltimore Orioles third baseman Manny Machado, and Texas Rangers first baseman Prince Fielder going against Cincinnati Reds third baseman Todd Frazier. How the derby will be played is also changing. Batters will have five minutes to hit as many homers as possible. Any home run hit within the last minute will stop the timer, which will not start again until the batter DOESN'T hit a homer. How far they hit the ball will matter for the first time, getting extra minutes on the clock for longer home runs. The derby will begin Monday at 8pm eastern time. I'm John Gregory, and this is Rivet.
“Home Run Derby Field Announced” Metadata:
- Title: Home Run Derby Field Announced
- Author: John Gregory
Edition Identifiers:
- Internet Archive ID: A63_20150709125051118
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The book is available for download in "audio" format, the size of the file-s is: 1.49 Mbs, the file-s went public at Fri Jul 11 2025.
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2Patriots Keep Swinging On Day 2 Of The NFL Draft And May Have Hit A Home Run
By The Next Pats Podcast - A Patriots Podcast
Tom Curran and Phil Perry break down the Patriots second and third round selections in the NFL Draft. What can the Patriots expect from WR Tyquan Thornton and CB Marcus Jones? :30-Getting to know Tyquan Thornton 4:00-Could the Patriots have got Thornton on day 3?11:30-Why Marcus Jones is good Patriots fit17:00-What do we want to see the Patriots do on day 3?Watch on YouTube: https://youtu.be/amPuKI1ZwBsSee Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.
“Patriots Keep Swinging On Day 2 Of The NFL Draft And May Have Hit A Home Run” Metadata:
- Title: ➤ Patriots Keep Swinging On Day 2 Of The NFL Draft And May Have Hit A Home Run
- Author: ➤ The Next Pats Podcast - A Patriots Podcast
“Patriots Keep Swinging On Day 2 Of The NFL Draft And May Have Hit A Home Run” Subjects and Themes:
- Subjects: ➤ Podcast - MacJones - NBCSportsNetwork - NFLDraft - PhilPerry - NBCSportsBoston - BillBelichick - NewEnglandPatriots - football - NFLNBCSportsNetwork - NFLdraft - philperry - Nfl - FOOTBALL - NEWENGLANDPATRIOTS
Edition Identifiers:
- Internet Archive ID: ➤ 4vgpw017y6k5sa5kdm5mdwmq8rh26l4nrz8figsr
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3Emma O'Driscoll On SEN WA's The Run Home - 29 March
By Fremantle Dockers Football Club
The ever-bubbly Emma O'Driscoll joins Paul Hasleby and Damian Martin on SEN WA to celebrate her 22under22 team selection and preview this weekend's final.See omnystudio.com/listener for privacy information.
“Emma O'Driscoll On SEN WA's The Run Home - 29 March” Metadata:
- Title: ➤ Emma O'Driscoll On SEN WA's The Run Home - 29 March
- Author: ➤ Fremantle Dockers Football Club
Edition Identifiers:
- Internet Archive ID: ➤ h5qxsmwvkuk2fjsdm4sxnuscqhseynxcrdxlmutc
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The book is available for download in "audio" format, the size of the file-s is: 9.60 Mbs, the file-s for this book were downloaded 4 times, the file-s went public at Sat Jun 11 2022.
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4Barry Bonds Home Run Record Complete Pin Set W- Game Used Tickets -- Superserg31
Barry Bonds Home Run Record Complete Pin Set w- Game Used Tickets -- superserg31
“Barry Bonds Home Run Record Complete Pin Set W- Game Used Tickets -- Superserg31” Metadata:
- Title: ➤ Barry Bonds Home Run Record Complete Pin Set W- Game Used Tickets -- Superserg31
“Barry Bonds Home Run Record Complete Pin Set W- Game Used Tickets -- Superserg31” Subjects and Themes:
Edition Identifiers:
- Internet Archive ID: ➤ Barry-Bonds-Home-Run-Record-Complete-Pin-Set-w-Game-Used-Tickets-superserg31
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The book is available for download in "image" format, the size of the file-s is: 1.73 Mbs, the file-s for this book were downloaded 77 times, the file-s went public at Mon Jan 25 2021.
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5⚾️😳 Vlad Jr. Destined For A SLUMP After Winning The Home Run Derby?? #homerunderby #mlb
By Deadspin
Vladimir Guerrero Jr. and Randy Arozarena were the finalists in the 2023 Home Run Derby. On this edition of Agree 2 Disagree, Deadspin's Andy Mills sits down with writers Eric Blum and DJ Dunson to debate which player will have the better second half of the MLB season. Will Randy Arozarena and the Tampa Bay Rays continue to control the American League East? Will Vladamir Guerrero Jr. continue to put up big numbers for the Toronto Blue Jays and potentially win an MVP award? #homerunderby #mlb #homerun Watch the full version of this episode: https://deadspin.com/vlad-guerrero-jr-randy-arozarena-home-run-derby-better-1850628217 Sports News without Fear, Favor, or Compromise: https://deadspin.com Follow us on social media: https://twitter.com/deadspin https://instagram.com/deadspin/ https://facebook.com/deadspin
“⚾️😳 Vlad Jr. Destined For A SLUMP After Winning The Home Run Derby?? #homerunderby #mlb” Metadata:
- Title: ➤ ⚾️😳 Vlad Jr. Destined For A SLUMP After Winning The Home Run Derby?? #homerunderby #mlb
- Author: Deadspin
“⚾️😳 Vlad Jr. Destined For A SLUMP After Winning The Home Run Derby?? #homerunderby #mlb” Subjects and Themes:
- Subjects: ➤ Youtube - video - Sports - deadspin - homerun derby - home run derby 2023 - homerun derby 2023 - vladamir guerrero jr home run derby - randy arozarena home run derby - vladamir guerrero jr wins home run derby - vladamir guerrero jr vs randy arozarena - mlb home run derby
Edition Identifiers:
- Internet Archive ID: youtube-qgUKXA8dwTs
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The book is available for download in "movies" format, the size of the file-s is: 14.23 Mbs, the file-s for this book were downloaded 13 times, the file-s went public at Fri Mar 15 2024.
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6Hank Aaron : Home Run Hero
By Morrison, Jessica
Vladimir Guerrero Jr. and Randy Arozarena were the finalists in the 2023 Home Run Derby. On this edition of Agree 2 Disagree, Deadspin's Andy Mills sits down with writers Eric Blum and DJ Dunson to debate which player will have the better second half of the MLB season. Will Randy Arozarena and the Tampa Bay Rays continue to control the American League East? Will Vladamir Guerrero Jr. continue to put up big numbers for the Toronto Blue Jays and potentially win an MVP award? #homerunderby #mlb #homerun Watch the full version of this episode: https://deadspin.com/vlad-guerrero-jr-randy-arozarena-home-run-derby-better-1850628217 Sports News without Fear, Favor, or Compromise: https://deadspin.com Follow us on social media: https://twitter.com/deadspin https://instagram.com/deadspin/ https://facebook.com/deadspin
“Hank Aaron : Home Run Hero” Metadata:
- Title: Hank Aaron : Home Run Hero
- Author: Morrison, Jessica
- Language: English
“Hank Aaron : Home Run Hero” Subjects and Themes:
- Subjects: ➤ Aaron, Hank, 1934- -- Juvenile literature - Baseball players -- United States -- Biography -- Juvenile literature - African American baseball players -- Biography -- Juvenile literature
Edition Identifiers:
- Internet Archive ID: hankaaronhomerun0000morr
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The book is available for download in "texts" format, the size of the file-s is: 416.32 Mbs, the file-s for this book were downloaded 39 times, the file-s went public at Thu Jul 30 2020.
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7Flick Home Run ! New Free (1.0, IOS 3.0)
App Version: 1.0 Minimum iOS Version: 3.0 Bundle ID: com.infinitypocket.FHRNewFree 64-bit: No
“Flick Home Run ! New Free (1.0, IOS 3.0)” Metadata:
- Title: ➤ Flick Home Run ! New Free (1.0, IOS 3.0)
Edition Identifiers:
- Internet Archive ID: ➤ Flick_Home_Run___New_Free_1.0_ios_3.0
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The book is available for download in "software" format, the size of the file-s is: 14.92 Mbs, the file-s went public at Mon Sep 08 2025.
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8Home Run High
Homerunhigh 1.19
“Home Run High” Metadata:
- Title: Home Run High
“Home Run High” Subjects and Themes:
Edition Identifiers:
- Internet Archive ID: homerunhigh_201912
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The book is available for download in "data" format, the size of the file-s is: 30.42 Mbs, the file-s for this book were downloaded 13 times, the file-s went public at Thu Dec 26 2019.
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9Why They Run" HOME Youth & Resource Center, Salem, Oregon
By Capital Community Television Salem
A closer look at Salem-area homeless youth, the reasons why they are homeless or run away, and how to help them. Peggy Kahan, head of Community Action Agency HOME Youth & Resource Center created the video, "Why They Run", with additional video by CCTV staff producer Wendy Brokaw
“Why They Run" HOME Youth & Resource Center, Salem, Oregon” Metadata:
- Title: ➤ Why They Run" HOME Youth & Resource Center, Salem, Oregon
- Author: ➤ Capital Community Television Salem
- Language: English
“Why They Run" HOME Youth & Resource Center, Salem, Oregon” Subjects and Themes:
- Subjects: ➤ Oregon - Salem - Capital Community Television Salem - CCTV - Public Access TV - Community Media - PEG - Youtube - 2011
Edition Identifiers:
- Internet Archive ID: ➤ Why_They_Run_HOME_Youth_Resource_Center_Salem_Oregon
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The book is available for download in "movies" format, the size of the file-s is: 179.65 Mbs, the file-s for this book were downloaded 129 times, the file-s went public at Wed Feb 10 2016.
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10Highlight: Washington State Baseball's J.J. Hancock Robs Lars Nootbaar Of Home Run
By WSUCougarAthletics
J.J. Hancock made a leaping catch at the wall, robbing USC's Lars Nootbaar of a go-ahead dinger in WSU's eventual 4-1 win over the Trojans Sunday in Los Angeles.
“Highlight: Washington State Baseball's J.J. Hancock Robs Lars Nootbaar Of Home Run” Metadata:
- Title: ➤ Highlight: Washington State Baseball's J.J. Hancock Robs Lars Nootbaar Of Home Run
- Author: WSUCougarAthletics
“Highlight: Washington State Baseball's J.J. Hancock Robs Lars Nootbaar Of Home Run” Subjects and Themes:
- Subjects: Youtube - video - Sports - Washington State - Baseball
Edition Identifiers:
- Internet Archive ID: youtube-yrmnx74YVqk
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The book is available for download in "movies" format, the size of the file-s is: 21.34 Mbs, the file-s for this book were downloaded 2 times, the file-s went public at Sun Aug 03 2025.
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11MLB Home Run Derby National Anthem 2024 By Ingrid Andress
By Buzzer Beater
J.J. Hancock made a leaping catch at the wall, robbing USC's Lars Nootbaar of a go-ahead dinger in WSU's eventual 4-1 win over the Trojans Sunday in Los Angeles.
“MLB Home Run Derby National Anthem 2024 By Ingrid Andress” Metadata:
- Title: ➤ MLB Home Run Derby National Anthem 2024 By Ingrid Andress
- Author: Buzzer Beater
“MLB Home Run Derby National Anthem 2024 By Ingrid Andress” Subjects and Themes:
Edition Identifiers:
- Internet Archive ID: youtube-p1UGpVnvZ9A
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The book is available for download in "movies" format, the size of the file-s is: 29.64 Mbs, the file-s for this book were downloaded 18 times, the file-s went public at Tue Jul 16 2024.
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12The Complete Handbook Of How To Start And Run A Money-making Business In Your Home
By Hammer, Marian Behan, 1928-
Includes index
“The Complete Handbook Of How To Start And Run A Money-making Business In Your Home” Metadata:
- Title: ➤ The Complete Handbook Of How To Start And Run A Money-making Business In Your Home
- Author: Hammer, Marian Behan, 1928-
- Language: English
“The Complete Handbook Of How To Start And Run A Money-making Business In Your Home” Subjects and Themes:
- Subjects: Self-employed - Supplementary employment - Small business - Home-based businesses
Edition Identifiers:
- Internet Archive ID: completehandbook00hamm
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The book is available for download in "texts" format, the size of the file-s is: 657.03 Mbs, the file-s for this book were downloaded 62 times, the file-s went public at Wed Nov 14 2012.
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1367 Ready-to-run Programs In BASIC : Graphics, Home & Business, Education, Games
By Watson, William Scott
Includes index
“67 Ready-to-run Programs In BASIC : Graphics, Home & Business, Education, Games” Metadata:
- Title: ➤ 67 Ready-to-run Programs In BASIC : Graphics, Home & Business, Education, Games
- Author: Watson, William Scott
- Language: English
“67 Ready-to-run Programs In BASIC : Graphics, Home & Business, Education, Games” Subjects and Themes:
- Subjects: ➤ Computer programs - BASIC (Computer program language)
Edition Identifiers:
- Internet Archive ID: ➤ 67-ready-to-run-programs-in-basic
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The book is available for download in "texts" format, the size of the file-s is: 121.97 Mbs, the file-s for this book were downloaded 898 times, the file-s went public at Tue Sep 25 2018.
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14NYBS Coaches Home Run Derby 05/02/2015
By Norton TV
NYBS Coaches Home Run Derby 05/02/2015
“NYBS Coaches Home Run Derby 05/02/2015” Metadata:
- Title: ➤ NYBS Coaches Home Run Derby 05/02/2015
- Author: Norton TV
- Language: English
“NYBS Coaches Home Run Derby 05/02/2015” Subjects and Themes:
- Subjects: ➤ Norton - Massachusetts - Norton TV - Public Access TV - Community Media - PEG - Vimeo - Sports - Norton Youth Baseball Softball - 2015
Edition Identifiers:
- Internet Archive ID: ➤ NYBS_Coaches_Home_Run_Derby_05_02_2015
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The book is available for download in "movies" format, the size of the file-s is: 677.92 Mbs, the file-s for this book were downloaded 49 times, the file-s went public at Tue Dec 20 2016.
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15Home Run : A Modern Approach To Baseball Skill Building
By McRae, Michael, 1969-
NYBS Coaches Home Run Derby 05/02/2015
“Home Run : A Modern Approach To Baseball Skill Building” Metadata:
- Title: ➤ Home Run : A Modern Approach To Baseball Skill Building
- Author: McRae, Michael, 1969-
- Language: English
“Home Run : A Modern Approach To Baseball Skill Building” Subjects and Themes:
- Subjects: Base-ball -- Entraînement - Baseball -- Training - Baseball-Training - Base-ball -- Entrainement
Edition Identifiers:
- Internet Archive ID: homerunmodernapp0000mcra
Downloads Information:
The book is available for download in "texts" format, the size of the file-s is: 434.11 Mbs, the file-s for this book were downloaded 19 times, the file-s went public at Fri Nov 08 2019.
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16Predicting Baseball Home Run Records Using Exponential Frequency Distributions
By D. J. Kelley, J. R. Mureika and J. A. Phillips
A new model, which uses the frequency of individuals' annual home run totals, is employed to predict future home run totals and records in Major League Baseball. Complete home run frequency data from 1903--2005 is analyzed, resulting in annual exponential distributions whose changes can be a used as a measure of progression in the sport and serve as a basis against which record-setting performances can be compared. We show that there is an 80% chance that Barry Bonds' current 73 home run record will be broken in the next 10 years, despite the longevity of previous records held by baseball legends Babe Ruth and Roger Marris.
“Predicting Baseball Home Run Records Using Exponential Frequency Distributions” Metadata:
- Title: ➤ Predicting Baseball Home Run Records Using Exponential Frequency Distributions
- Authors: D. J. KelleyJ. R. MureikaJ. A. Phillips
- Language: English
Edition Identifiers:
- Internet Archive ID: arxiv-physics0608228
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The book is available for download in "texts" format, the size of the file-s is: 1.53 Mbs, the file-s for this book were downloaded 86 times, the file-s went public at Fri Sep 20 2013.
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17HOME RUN POLKA
By RAY HENRY and his Orchestra and R. Henry
Performer: RAY HENRY and his Orchestra Writer: R. Henry Instrumental. Digitized at 78 revolutions per minute. Four stylii were used to transfer this record. They are 3.5mil truncated eliptical, 2.3mil truncated conical, 2.8mil truncated conical, 3.3mil truncated conical. These were recorded flat and then also equalized with Turnover: 375.0, Rolloff: -12.0. The preferred versions suggested by an audio engineer at George Blood, L.P. have been copied to have the more friendly filenames. Matrix number: DAN-3055-B Catalog number: 3055 B
“HOME RUN POLKA” Metadata:
- Title: HOME RUN POLKA
- Authors: RAY HENRY and his OrchestraR. Henry
- Language: English
“HOME RUN POLKA” Subjects and Themes:
Edition Identifiers:
- Internet Archive ID: ➤ 78_home-run-polka_ray-henry-and-his-orchestra-r-henry_gbia0444347b
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18The Chromium Logo The Chromium Projects Home Chromium ChromiumOS Quick Links Report Bugs Discuss Other Sites Chromium Blog Google Chrome Extensions Except As Otherwise Noted, The Content Of This Page Is Licensed Under A Creative Commons Attribution 2.5 License, And Examples Are Licensed Under The BSD License. Privacy Edit This Page For Developers > How-Tos > Debugging Chromium On Windows First See Get The Code For Checkout And Build Instructions. Getting Started You Can Use Visual Studio's Built-in Debugger Or WinDBG To Debug Chromium. You Don't Need To Use The IDE To Build In Order To Use The Debugger: Autoninja Is Used To Build Chromium And Most Developers Invoke It From A Command Prompt, And Then Open The IDE For Debugging As Necessary. To Start Debugging An Already-built Executable With Visual Studio Just Launch Visual Studio (2019 Or Higher) And Select File-> Open-> Project/Solution (Ctrl+Shift+O) And Select The Executable Of Interest. This Will Create A Solution With That Executable As The 'project'. You Can Then Launch The Debugger With F5 Or F11 Or From The Debug Menu. If You Right-click On The Executable In Solution Explorer And Select Properties Then You Can Edit Things Such As The Executable Path, Command-line Arguments, And Working Directory. You Can Add Additional Executables To The Solution By Using File-> Add-> Existing Project And Selecting Another Already-built Executable. You Can Select Which One To Debug By Right-clicking On One Of Them In Solution Explorer And Selecting Set As Startup Project. When Your Solution File Is Customized To Your Taste You Can Save It To A Directory Such As Out\solutions. Saving It There Helps Ensure That Relative Paths To Source Files, Printed From Build Commands, Will Correctly Identify The Source Files. The Tools Menu Can Be Used To Add Commands To Do Things Like Invoke Autoninja To Build Chrome, Compile The Selected Source File, Or Other Things. Visual Studio 2017 Is Not Recommended For Debugging Of Chromium - Use A Newer Version For Best Performance And Stability. Symbol_level=2 Is The Default On Windows And Gives Full Debugging Information With Types, Locals, Globals, Function Names, And Source/line Information. Symbol_level=1 Creates Smaller PDBs With Just Function Names, And Source/line Information - Source-level Debugging Is Still Supported (new From June 2019), But Local Variables And Type Information Are Missing. Symbol_level=0 Gives Extremely Limited Debugging Abilities, Mostly Just Viewing Call Stacks When Chromium Crashes. Browsing Source Code If You Use A Solution File Generated By Gn (gn Gen --ide=vs) Then Intellisense May Help You Navigate The Code. If This Doesn't Work Or If You Use A Solution Created As Above Then You May Want To Install VsChromium To Help Navigate The Code, As Well As Using Https://source.chromium.org. Profiles It's A Good Idea To Use A Different Chrome Profile For Your Debugging. If You Are Debugging Google Chrome Branded Builds, Or Use A Chromium Build As Your Primary Browser, The Profiles Can Collide So You Can't Run Both At Once, And Your Stable Browser Might See Profile Versions From The Future (Google Chrome And Chromium Use Different Profile Directories By Default So Won't Collide). Use The Command-line Option: --user-data-dir=C:\tmp\my_debug_profile (replace The Path As Necessary) Using The IDE, Go To The Debugging Tab Of The Properties Of The Chrome Project, And Set The Command Arguments. Chrome Debug Log Enable Chrome Debug Logging To A File By Passing --enable-logging --v=1 Command-line Flags At Startup. Debug Builds Place The Chrome_debug.log File In The Out\Debug Directory. Release Builds Place The File In The Top Level Of The User Data Chromium App Directory, Which Is OS-version-dependent. For More Information, See Logging And User Data Directory Details. Symbol Server If You Are Debugging Official Google Chrome Release Builds, Use The Symbol Server: Https://chromium-browser-symsrv.commondatastorage.googleapis.com In Visual Studio, This Goes In Tools > Options Under Debugging > Symbols. You Should Set Up A Local Cache In A Empty Directory On Your Computer. In Windbg You Can Add This To Your Symbol Server Search Path With The Command Below, Where C:\symbols Is A Local Cache Directory: .sympath+ SRV\*C:\symbols\*https://chromium-browser-symsrv.commondatastorage.googleapis.com Alternately, You Can Set The _NT_SYMBOL_PATH Environment Variable To Include Both The Microsoft And Google Symbol Servers - VS, Windbg, And Other Tools Should Both Respect This Environment Variable: _NT_SYMBOL_PATH=SRV\*C:\symbols\*https://msdl.microsoft.com/download/symbols;SRV\*C:\symbols\*https://chromium-browser-symsrv.commondatastorage.googleapis.com Note That Symbol Servers Will Let The Debuggers Download Both The PE Files (DLLs And EXEs) And The PDB Files. Chrome Often Loads Third Party Libraries And Partial Symbols For Some Of These Are Also Public. For Example: AMD: Https://download.amd.com/dir/bin Nvidia: Https://driver-symbols.nvidia.com/ Intel: Https://software.intel.com/sites/downloads/symbols/ For Example, For Completeness, The Following Symbol Server Environment Variable Will Resolve All Of The Above Sources - But This Is More Than Is Normally Needed: _NT_SYMBOL_PATH=SRV\*C:\symbols\*https://msdl.microsoft.com/download/symbols;SRV\*C:\symbols\*https://chromium-browser-symsrv.commondatastorage.googleapis.com;SRV\*C:\symbols\*https://download.amd.com/dir/bin;SRV\*C:\symbols\*https://driver-symbols.nvidia.com/;SRV\*C:\symbols\*https://software.intel.com/sites/downloads/symbols/ Source Indexing You Should Set Up Source Indexing In Your Debugger (.srcfix In Windbg, Tools-> Options-> Debugging-> General-> Enable Source Server Support In Visual Studio) So That The Correct Source Files Will Automatically Be Downloaded Based On Information In The Downloaded Symbols. Additionally, You Must Have Python In Your Path In Order For The Command That Fetches Source Files To Succeed; Launching The Debugger From The Same Environment As Where You Build Chromium Is An Easy Way To Ensure It's Present. This Is Highly Recommended When Debugging Released Google Chrome Builds Or Looking At Crash Dumps. Having The Correct Version Of The Source Files Automatically Show Up Saves Significant Time So You Should Definitely Set This. Multi-process Issues Chromium Can Be Challenging To Debug Because Of Its Multi-process Architecture. When You Select Run In The Debugger, Only The Main Browser Process Will Be Debugged. The Code That Actually Renders Web Pages (the Renderer) And The Plugins Will Be In Separate Processes That's Not (yet!) Being Debugged. The ProcessExplorer Tool Has A Process Tree View Where You Can See How These Processes Are Related. You Can Also Get The Process IDs Associated With Each Tab From The Chrome Task Manager (right-click On An Empty Area Of The Window Title Bar To Open). Automatically Attach To Child Processes There Are Two Visual Studio Extensions That Enable The Debugger To Automatically Attach To All Chrome Processes, So You Can Debug All Of Chrome At Once. Microsoft's Child Process Debugging Power Tool Is A Standalone Extension For This, And VsChromium Is Another Option That Bundles Many Other Additional Features. In Addition To Installing One Of These Extensions, You Must Run Visual Studio As Administrator, Or It Will Silently Fail To Attach To Some Of Chrome's Child Processes. Single-process Mode One Way To Debug Issues Is To Run Chromium In Single-process Mode. This Will Allow You To See The Entire State Of The Program Without Extra Work (although It Will Still Have Many Threads). To Use Single-process Mode, Add The Command-line Flag --single-process This Approach Isn't Perfect Because Some Problems Won't Manifest Themselves In This Mode And Some Features Don't Work And Worker Threads Are Still Spawned Into New Processes. Manually Attaching To A Child Process You Can Attach To The Running Child Processes With The Debugger. Select Tools > Attach To Process And Click The Chrome.exe Process You Want To Attach To. Before Attaching, Make Sure You Have Selected Only Native Code When Attaching To The Process This Is Done By Clicking Select... In The Attach To Process Window And Only Checking Native. If You Forget This, It May Attempt To Attach In "WebKit" Mode To Debug JavaScript, And You'll Get An Error Message "An Operation Is Not Legal In The Current State." You Can Now Debug The Two Processes As If They Were One. When You Are Debugging Multiple Processes, Open The Debug > Windows > Processes Window To Switch Between Them. Sometimes You Are Debugging Something That Only Happens On Startup, And Want To See The Child Process As Soon As It Starts. Use: --renderer-startup-dialog --no-sandbox You Have To Disable The Sandbox Or The Dialog Box Will Be Prohibited From Showing. When The Dialog Appears, Visit Tools > Attach To Process And Attach To The Process Showing The Renderer Startup Dialog. Now You're Debugging In The Renderer And Can Continue Execution By Pressing OK In The Dialog. Startup Dialogs Also Exist For Other Child Process Types: --gpu-startup-dialog, --ppapi-startup-dialog, --utility-startup-dialog, --plugin-startup-dialog (for NPAPI). For Utilities, You Can Add A Service Type --utility-startup-dialog=data_decoder.mojom.DataDecoderService. You Can Also Try The Vs-chromium Plug-in To Attach To The Right Processes. Semi-automatically Attaching The Debugger To Child Processes The Following Flags Cause Child Processes To Wait For 60 Seconds In A Busy Loop For A Debugger To Attach To The Process. Once Either Condition Is True, It Continues On; No Exception Is Thrown. --wait-for-debugger-children[=filter] The Filter, If Provided, Will Fire Only If It Matches The --type Parameter To The Process. Values Include Renderer, Plugin (for NPAPI), Ppapi, Gpu-process, And Utility. When Using This Option, It May Be Helpful To Limit The Number Of Renderer Processes Spawned, Using: --renderer-process-limit=1 Image File Execution Options Using Image File Execution Options (IFEO) Will Not Work Because CreateProcess() Returns The Handle To The Debugger Process Instead Of The Intended Child Process. There Are Also Issues With The Sandbox. Time Travel Debugging You Can Do Time Travel Debugging Using WinDbg Preview (must Be Installed From The Microsoft Store). This Lets You Execute A Program Forward And Backwards. After Capturing A Trace, You Can Set Breakpoints And Step Through Code As Normal, But Also Provides 'backwards' Commands (g-, T-, P-) So That You Can Go Back And Forth Through The Execution. It Is Especially Useful To Set Data Breakpoints (ba Command) And Reverse Continuing, So You Can See When A Certain Variable Was Last Changed To Its Current Value. Chromium Specifics: The Type Of Injection The Time Travel Tracer Needs To Perform Is Incompatible With The Chromium Sandbox. In Order To Record A Trace, You'll Need To Run With --no-sandbox. Chromium Cannot Run Elevated With Administrator Privileges, So The "Launch Executable (advance)" Option Won't Work, You'll Need To Attach After The Process Has Already Launched Via The Checkbox In The Bottom Right. If You Need To Record Startup-like Things, You'll Have To Use --{browser,gpu,renderer,utility}-startup-dialog, Then Attach (and Hope The Relevant Code Hasn't Executed Before That Point). JsDbg -- Data Structure Visualization You Can Install JsDbg As A Plugin For WinDbg Or Visual Studio. It Interactively Lets You Look At Data Structures (such As The DOM Tree, Accessibility Tree, Layout Object Tree, And Others) In A Web Browser As You Debug. See The JsDbg Site For Some Screen Shots And Usage Examples. This Also Works When Examining Memory Dumps (though Not Minidumps), And Also Works Together With Time Travel Debugging. Visual Studio Hints Debug Visualizers Chrome's Custom Debug Visualizers Should Be Added To The Pdb Files And Automatically Picked Up By Visual Studio. The Definitions Are In //tools/win/DebugVisualizers If You Need To Modify Them (the BUILD.gn File There Has Additional Instructions). Don't Step Into Trivial Functions The Debugger Can Be Configured To Automatically Not Step Into Functions Based On Regular Expression. Edit Default.natstepfilter In The Following Directory: For Visual Studio 2015: C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\Packages\Debugger\Visualizers (for All Users) Or %USERPROFILE%\My Documents\Visual Studio 2015\Visualizers (for The Current User Only) For Visual Studio 2017 Pro: C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\Common7\Packages\Debugger\Visualizers (for All Users) Or %USERPROFILE%\My Documents\Visual Studio 2017\Visualizers (for The Current User Only) Add Regular Expressions Of Functions To Not Step Into. Remember To Regex-escape And XML-escape Them, E.g. < For < And \. For A Literal Dot. Example: Operator New NoStepInto Operator Delete NoStepInto Std::.* NoStepInto WTF::.*Ptr ::.* NoStepInto This File Is Read At Start Of A Debugging Session (F5), So You Don't Need To Restart Visual Studio After Changing It. More Info: Microsoft Email Thread V8 And Chromium V8 Supports Many Command-line Flags That Are Useful For Debugging. V8 Command-line Flags Can Be Set Via The Chromium Command-line Flag --js-flags; For Instance: Chrome.exe --js-flags="--trace_exception --heap_stats" Note That Some V8 Command-line Flags Exist Only In The Debug Build Of V8. For A List Of All V8 Flags Try: Chrome.exe --js-flags="--help" Graphics Debugging GPU Acceleration Of Rendering Can Be More Easily Debugged With Tools. See: Graphics Debugging In Visual Studio 2013 Graphical Debugging With NVIDIA NSight Debugging On Another Machine Sometimes It's Useful To Debug Installation And Execution On A Machine Other Than Your Primary Build Box. To Run The Installer On Said Other Machine, First Build The Mini_installer Target On Your Main Build Machine (e.g., Autoninja -C Out\Debug Mini_installer). Next, On The Debug Machine: Make The Build Machine's Build Volume Available On The Debug Machine Either By Mounting It Locally (e.g., Z:\) Or By Crafting A UNC Path To It (e.g., \\builder\src) Open Up A Command Prompt And Change To A Local Disk Run Src\tools\win\copy-installer.bat In The Remote Checkout By Way Of The Mount (e.g., Z:\PATHTOCHECKOUT\src\...) Or UNC Path (e.g., \\builder\src\...). This Will Copy The Installer, DLLs, And PDBs Into Your Debug Machine's C:\out Or C:\build (depending On If You're Rocking The Component=shared_library Build Or Not) Run C:\out\Debug\mini_installer.exe With The Flags Of Your Choice To Install Chrome. This Can Take Some Time, Especially On A Slow Machine. Watch The Task Manager And Wait Until Mini_installer.exe Exits Before Trying To Launch Chrome (by Way Of The Shortcut(s) Created By The Installer) For Extra Pleasure, Add C:\out\Debug To Your _NT_SYMBOL_PATH Environment Variable Consider Reading The Documentation At The Top Of Copy-installer.bat To See How You Can Run It. It Tries To Be Smart And Copy The Right Things, But You May Need To Be Explicit (e.g., "copy-installer.bat Out Debug"). It Is Safe To Re-run The Script To Copy Only Modified Files (after A Rebuild, For Example). You Can Also Use The Zip Action Of The Isolate Scripts (tools\mb\mb.py) To Package All The Files For A Target Into A Single Zip File, For Example: Python Tools\mb\mb.py Zip Out/Release Base_unittests Base_unittests.zip Finding All Memory Allocations It Is Possible To Use Heap Snapshots To Get Call Stacks On All Outstanding Allocations That Use The OS Heap. This Works Particularly Well If Heap Snapshots Are Started As Soon As The Chrome Browser Process Is Created, But Before It Starts Running. Details Can Be Found In This Batch File. However, With PartitionAlloc Everywhere Most Chromium Allocations No Longer Use The Windows Heap So This Will Only Find A Subset Of Allocations, Mostly From OS DLLs. Find Memory Leaks Note: As With Heap Snapshots The Utility Of UMDH Is Greatly Reduced Now Because PartitionAlloc Everywhere Has Mostly Replaced The Windows Heap. The Windows Heap Manager Has A Really Useful Debug Flag, Where It Can Be Asked To Capture And Store A Stack Trace With Every Allocation. The Tool To Scrape These Stack Traces Out Of Processes Is UMDH, Which Comes With WinDbg. UMDH Is Great. It Will Capture A Snapshot Of The Heap State As Many Times As You Like, And It'll Do It Fairly Quickly. You Then Run It Again Against Either A Single Snapshot, Or A Pair Of Snapshots, At Which Time It'll Symbolize The Stack Traces And Aggregate Usage Up To Unique Stack Traces. Turning On The User Stack Trace Database For Chrome.exe With Gflags.exe Makes It Run Unbearably Slowly; However, Turning On The User Stack Trace Database On For The Browser Alone Is Just Fine. While It's Possible To Turn On The User Stack Database With The "!gflag" Debugging Extension, It's Too Late To Do This By The Time The Initial Debugger Breakpoint Hits. The Only Reasonable Way To Do This Is To Launch GFlags.exe, Enable The User Stack Trace Database (per Image Below), Launch Chrome Under The Debugger. Set A Breakpont When Chrome.dll Loads With "sxe Ld Chrome.dll". Step Up, To Allow Chrome.dll To Initialize. Disable The Stack Trace Database In GFlags.exe. Continue Chrome, Optionally Detaching The Debugger. Image GFlags.exe Settings For User Mode Stack Trace Database. If You Then Ever Suffer A Browser Memory Leak, You Can Snarf A Dump Of The Process With Umdh -p: > Chrome-browser-leak-umdh-dump.txt Which Can Then Typically Be "trivially" Analyzed To Find The Culprit. Miscellaneous Note That By Default Application Verifier Only Works With Non-official Builds Of Chromium. To Use Application Verifier On Official Builds You Need To Add --disable-features=RendererCodeIntegrity To Avoid Sandbox Crashes In Renderer Processes. See Crbug.com/1004989 For Details. See Also This Page. Application Verifier Is A Free Tool From Microsoft (available As Part Of The Windows SDK) That Can Be Used To Flush Out Programming Errors. Starting With M68 Application Verifier Can Be Enabled For Chrome.exe Without Needing To Disable The Sandbox. After Adding Chrome.exe To The List Of Applications To Be Stressed You Need To Expand The List Of Basics Checks And Disable The Leak Checks. You May Also Need To Disable Handles And Locks Checks Depending On Your Graphics Driver And Specific Chrome Version, But The Eventual Goal Is To Have Chrome Run With Handles And Locks Checks Enabled. When Bugs Are Found Chrome Will Trigger A Breakpoint So Running All Chrome Processes Under A Debugger Is Recommended. Chrome Will Run Much More Slowly Because Application Verifier Puts Every Heap Allocation On A Separate Page. Note That With PartitionAlloc Everywhere Most Chromium Allocations Don't Actually Go Through The Windows Heap And Are Therefore Unaffected By Application Verifier. You Can Check The Undocumented 'Cuzz' Checkbox In Application Verifier To Get The Windows Thread Scheduler To Add Some Extra Randomness In Order To Help Expose Race Conditions In Your Code. To Put A Breakpoint On CreateFile(), Add This Break Point: {,,kernel32.dll}_CreateFileW@28 {,,kernel32.dll} Specifies The DLL (context Operator). _ Prefix Means Extern "C". @28 Postfix Means _stdcall With The Stack Pop At The End Of The Function. I.e. The Number Of Arguments In BYTES. You Can Use DebugView From SysInternals Or Sawbuck To View LOG() Messages That Normally Go To Stderr On POSIX.
The Chromium Projects Home Chromium ChromiumOS Quick links Report bugs Discuss Other sites Chromium Blog Google Chrome Extensions Except as otherwise noted , the content of this page is licensed under a Creative Commons Attribution 2.5 license , and examples are licensed under the BSD License . Privacy Edit this page For Developers > How-Tos > Debugging Chromium on Windows First see get the code for checkout and build instructions. Getting started You can use Visual Studio's built-in debugger or WinDBG to debug Chromium. You don't need to use the IDE to build in order to use the debugger: autoninja is used to build Chromium and most developers invoke it from a command prompt, and then open the IDE for debugging as necessary. To start debugging an already-built executable with Visual Studio just launch Visual Studio (2019 or higher) and select File-> Open-> Project/Solution (Ctrl+Shift+O) and select the executable of interest. This will create a solution with that executable as the 'project'. You can then launch the debugger with F5 or F11 or from the Debug menu. If you right-click on the executable in Solution Explorer and select properties then you can edit things such as the executable path, command-line arguments, and working directory. You can add additional executables to the solution by using File-> Add-> Existing Project and selecting another already-built executable. You can select which one to debug by right-clicking on one of them in Solution Explorer and selecting Set as Startup Project. When your solution file is customized to your taste you can save it to a directory such as out\solutions. Saving it there helps ensure that relative paths to source files, printed from build commands, will correctly identify the source files. The Tools menu can be used to add commands to do things like invoke autoninja to build Chrome, compile the selected source file, or other things. Visual Studio 2017 is not recommended for debugging of Chromium - use a newer version for best performance and stability. symbol_level=2 is the default on Windows and gives full debugging information with types, locals, globals, function names, and source/line information. symbol_level=1 creates smaller PDBs with just function names, and source/line information - source-level debugging is still supported (new from June 2019), but local variables and type information are missing. symbol_level=0 gives extremely limited debugging abilities, mostly just viewing call stacks when Chromium crashes. Browsing source code If you use a solution file generated by gn ( gn gen --ide=vs ) then Intellisense may help you navigate the code. If this doesn't work or if you use a solution created as above then you may want to install VsChromium to help navigate the code, as well as using https://source.chromium.org . Profiles It's a good idea to use a different Chrome profile for your debugging. If you are debugging Google Chrome branded builds, or use a Chromium build as your primary browser, the profiles can collide so you can't run both at once, and your stable browser might see profile versions from the future (Google Chrome and Chromium use different profile directories by default so won't collide). Use the command-line option: --user-data-dir =C:\tmp\my_debug_profile (replace the path as necessary) Using the IDE, go to the Debugging tab of the properties of the chrome project, and set the Command Arguments. Chrome debug log Enable Chrome debug logging to a file by passing --enable-logging --v=1 command-line flags at startup. Debug builds place the chrome_debug.log file in the out\Debug directory. Release builds place the file in the top level of the user data Chromium app directory, which is OS-version-dependent. For more information, see logging and user data directory details. Symbol server If you are debugging official Google Chrome release builds, use the symbol server: https://chromium-browser-symsrv.commondatastorage.googleapis.com In Visual Studio, this goes in Tools > Options under Debugging > Symbols . You should set up a local cache in a empty directory on your computer. In windbg you can add this to your symbol server search path with the command below, where C:\symbols is a local cache directory: .sympath+ SRV\*C:\symbols\*https://chromium-browser-symsrv.commondatastorage.googleapis.com Alternately, You can set the _NT_SYMBOL_PATH environment variable to include both the Microsoft and Google symbol servers - VS, windbg, and other tools should both respect this environment variable: _NT_SYMBOL_PATH =SRV\*C:\symbols\*https://msdl.microsoft.com/download/symbols ;SRV\*C:\symbols\*https://chromium-browser-symsrv.commondatastorage.googleapis.com Note that symbol servers will let the debuggers download both the PE files (DLLs and EXEs) and the PDB files. Chrome often loads third party libraries and partial symbols for some of these are also public. For example: AMD : https://download.amd.com/dir/bin Nvidia : https://driver-symbols.nvidia.com/ Intel : https://software.intel.com/sites/downloads/symbols/ For example, for completeness, the following symbol server environment variable will resolve all of the above sources - but this is more than is normally needed: _NT_SYMBOL_PATH=SRV\*C:\symbols\*https://msdl.microsoft.com/download/symbols;SRV\*C:\symbols\*https://chromium-browser-symsrv.commondatastorage.googleapis.com;SRV\*C:\symbols\*https://download.amd.com/dir/bin;SRV\*C:\symbols\*https://driver-symbols.nvidia.com/;SRV\*C:\symbols\*https://software.intel.com/sites/downloads/symbols/ Source indexing You should set up source indexing in your debugger ( .srcfix in windbg, Tools-> Options-> Debugging-> General-> Enable source server support in Visual Studio) so that the correct source files will automatically be downloaded based on information in the downloaded symbols. Additionally, you must have python in your path in order for the command that fetches source files to succeed; launching the debugger from the same environment as where you build Chromium is an easy way to ensure it's present. This is highly recommended when debugging released Google Chrome builds or looking at crash dumps. Having the correct version of the source files automatically show up saves significant time so you should definitely set this. Multi-process issues Chromium can be challenging to debug because of its multi-process architecture . When you select Run in the debugger, only the main browser process will be debugged. The code that actually renders web pages (the Renderer) and the plugins will be in separate processes that's not (yet!) being debugged. The ProcessExplorer tool has a process tree view where you can see how these processes are related. You can also get the process IDs associated with each tab from the Chrome Task Manager (right-click on an empty area of the window title bar to open). Automatically attach to child processes There are two Visual Studio extensions that enable the debugger to automatically attach to all Chrome processes, so you can debug all of Chrome at once. Microsoft's Child Process Debugging Power Tool is a standalone extension for this, and VsChromium is another option that bundles many other additional features. In addition to installing one of these extensions, you must run Visual Studio as Administrator, or it will silently fail to attach to some of Chrome's child processes. Single-process mode One way to debug issues is to run Chromium in single-process mode. This will allow you to see the entire state of the program without extra work (although it will still have many threads). To use single-process mode, add the command-line flag --single-process This approach isn't perfect because some problems won't manifest themselves in this mode and some features don't work and worker threads are still spawned into new processes. Manually attaching to a child process You can attach to the running child processes with the debugger. Select Tools > Attach to Process and click the chrome.exe process you want to attach to. Before attaching, make sure you have selected only Native code when attaching to the process This is done by clicking Select... in the Attach to Process window and only checking Native. If you forget this, it may attempt to attach in "WebKit" mode to debug JavaScript, and you'll get an error message "An operation is not legal in the current state." You can now debug the two processes as if they were one. When you are debugging multiple processes, open the Debug > Windows > Processes window to switch between them. Sometimes you are debugging something that only happens on startup, and want to see the child process as soon as it starts. Use: --renderer-startup-dialog --no-sandbox You have to disable the sandbox or the dialog box will be prohibited from showing. When the dialog appears, visit Tools > Attach to Process and attach to the process showing the Renderer startup dialog. Now you're debugging in the renderer and can continue execution by pressing OK in the dialog. Startup dialogs also exist for other child process types: --gpu-startup-dialog , --ppapi-startup-dialog , --utility-startup-dialog , --plugin-startup-dialog (for NPAPI). For utilities, you can add a service type --utility-startup-dialog=data_decoder.mojom.DataDecoderService . You can also try the vs-chromium plug-in to attach to the right processes. Semi-automatically attaching the debugger to child processes The following flags cause child processes to wait for 60 seconds in a busy loop for a debugger to attach to the process. Once either condition is true, it continues on; no exception is thrown. --wait-for-debugger-children [=filter] The filter, if provided, will fire only if it matches the --type parameter to the process. Values include renderer , plugin (for NPAPI), ppapi , gpu-process , and utility . When using this option, it may be helpful to limit the number of renderer processes spawned, using: --renderer-process-limit = 1 Image File Execution Options Using Image File Execution Options (IFEO) will not work because CreateProcess() returns the handle to the debugger process instead of the intended child process. There are also issues with the sandbox. Time travel debugging You can do time travel debugging using WinDbg Preview (must be installed from the Microsoft Store). This lets you execute a program forward and backwards. After capturing a trace, you can set breakpoints and step through code as normal, but also provides 'backwards' commands (g-, t-, p-) so that you can go back and forth through the execution. It is especially useful to set data breakpoints ( ba command ) and reverse continuing, so you can see when a certain variable was last changed to its current value. Chromium specifics: The type of injection the time travel tracer needs to perform is incompatible with the Chromium sandbox. In order to record a trace, you'll need to run with --no-sandbox . Chromium cannot run elevated with Administrator privileges, so the "Launch executable (advance)" option won't work, you'll need to attach after the process has already launched via the checkbox in the bottom right. If you need to record startup-like things, you'll have to use --{browser,gpu,renderer,utility}-startup-dialog, then attach (and hope the relevant code hasn't executed before that point). JsDbg -- data structure visualization You can install JsDbg as a plugin for WinDbg or Visual Studio . It interactively lets you look at data structures (such as the DOM tree, Accessibility tree, layout object tree, and others) in a web browser as you debug. See the JsDbg site for some screen shots and usage examples. This also works when examining memory dumps (though not minidumps), and also works together with time travel debugging. Visual Studio hints Debug visualizers Chrome's custom debug visualizers should be added to the pdb files and automatically picked up by Visual Studio. The definitions are in //tools/win/DebugVisualizers if you need to modify them (the BUILD.gn file there has additional instructions). Don't step into trivial functions The debugger can be configured to automatically not step into functions based on regular expression. Edit default.natstepfilter in the following directory: For Visual Studio 2015: C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\Packages\Debugger\Visualizers (for all users) or %USERPROFILE%\My Documents\Visual Studio 2015\Visualizers (for the current user only) For Visual Studio 2017 Pro: C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\Common7\Packages\Debugger\Visualizers (for all users) or %USERPROFILE%\My Documents\Visual Studio 2017\Visualizers (for the current user only) Add regular expressions of functions to not step into. Remember to regex-escape and XML-escape them, e.g. < for < and \. for a literal dot. Example: < Function > < Name > operator new </ Name > < Action > NoStepInto </ Action > </ Function > < Function > < Name > operator delete </ Name > < Action > NoStepInto </ Action > </ Function > <!-- Skip everything in std --> < Function > < Name > std::.* </ Name > < Action > NoStepInto </ Action > </ Function > <!-- all methods on WebKit OwnPtr and variants, ... WTF::*Ptr<*>::* --> < Function > < Name > WTF::.*Ptr<.*>::.* </ Name > < Action > NoStepInto </ Action > </ Function > This file is read at start of a debugging session (F5), so you don't need to restart Visual Studio after changing it. More info: Microsoft email thread V8 and Chromium V8 supports many command-line flags that are useful for debugging. V8 command-line flags can be set via the Chromium command-line flag --js-flags; for instance: chrome.exe --js-flags= "--trace_exception --heap_stats" Note that some V8 command-line flags exist only in the debug build of V8. For a list of all V8 flags try: chrome.exe --js-flags= "--help" Graphics debugging GPU Acceleration of rendering can be more easily debugged with tools. See: Graphics Debugging in Visual Studio 2013 Graphical debugging with NVIDIA NSight Debugging on another machine Sometimes it's useful to debug installation and execution on a machine other than your primary build box. To run the installer on said other machine, first build the mini_installer target on your main build machine (e.g., autoninja -C out\Debug mini_installer). Next, on the debug machine: Make the build machine's build volume available on the debug machine either by mounting it locally (e.g., Z:\) or by crafting a UNC path to it (e.g., \\builder\src) Open up a command prompt and change to a local disk Run src\tools\win\ copy-installer.bat in the remote checkout by way of the mount (e.g., Z:\PATHTOCHECKOUT\src\...) or UNC path (e.g., \\builder\src\...). This will copy the installer, DLLs, and PDBs into your debug machine's C:\out or C:\build (depending on if you're rocking the component=shared_library build or not) Run C:\out\Debug\mini_installer.exe with the flags of your choice to install Chrome. This can take some time, especially on a slow machine. Watch the Task Manager and wait until mini_installer.exe exits before trying to launch Chrome (by way of the shortcut(s) created by the installer) For extra pleasure, add C:\out\Debug to your _NT_SYMBOL_PATH environment variable Consider reading the documentation at the top of copy-installer.bat to see how you can run it. It tries to be smart and copy the right things, but you may need to be explicit (e.g., "copy-installer.bat out Debug"). It is safe to re-run the script to copy only modified files (after a rebuild, for example). You can also use the zip action of the isolate scripts (tools\mb\mb.py) to package all the files for a target into a single zip file, for example: python tools\mb\mb.py zip out/Release base_unittests base_unittests. zip Finding all memory allocations It is possible to use Heap Snapshots to get call stacks on all outstanding allocations that use the OS heap. This works particularly well if heap snapshots are started as soon as the Chrome browser process is created, but before it starts running. Details can be found in this batch file . However, with PartitionAlloc Everywhere most Chromium allocations no longer use the Windows heap so this will only find a subset of allocations, mostly from OS DLLs. Find memory leaks Note: as with Heap Snapshots the utility of UMDH is greatly reduced now because PartitionAlloc Everywhere has mostly replaced the Windows heap. The Windows heap manager has a really useful debug flag, where it can be asked to capture and store a stack trace with every allocation. The tool to scrape these stack traces out of processes is UMDH, which comes with WinDbg . UMDH is great. It will capture a snapshot of the heap state as many times as you like, and it'll do it fairly quickly. You then run it again against either a single snapshot, or a pair of snapshots, at which time it'll symbolize the stack traces and aggregate usage up to unique stack traces. Turning on the user stack trace database for chrome.exe with gflags.exe makes it run unbearably slowly; however, turning on the user stack trace database on for the browser alone is just fine. While it's possible to turn on the user stack database with the "!gflag" debugging extension, it's too late to do this by the time the initial debugger breakpoint hits. The only reasonable way to do this is to Launch GFlags.exe, Enable the user stack trace database (per image below), Launch Chrome under the debugger. Set a breakpont when chrome.dll loads with "sxe ld chrome.dll". Step up, to allow Chrome.dll to initialize. Disable the stack trace database in GFlags.exe. Continue chrome, optionally detaching the debugger. GFlags.exe settings for user mode stack trace database. If you then ever suffer a browser memory leak, you can snarf a dump of the process with umdh - p :<my browser pid> > chrome-browser-leak-umdh-dump.txt which can then typically be "trivially" analyzed to find the culprit. Miscellaneous Note that by default Application Verifier only works with non-official builds of Chromium. To use Application Verifier on official builds you need to add --disable-features=RendererCodeIntegrity to avoid sandbox crashes in renderer processes. See crbug.com/1004989 for details. See also this page . Application Verifier is a free tool from Microsoft (available as part of the Windows SDK) that can be used to flush out programming errors. Starting with M68 Application Verifier can be enabled for chrome.exe without needing to disable the sandbox. After adding chrome.exe to the list of applications to be stressed you need to expand the list of Basics checks and disable the Leak checks. You may also need to disable Handles and Locks checks depending on your graphics driver and specific Chrome version, but the eventual goal is to have Chrome run with Handles and Locks checks enabled. When bugs are found Chrome will trigger a breakpoint so running all Chrome processes under a debugger is recommended. Chrome will run much more slowly because Application Verifier puts every heap allocation on a separate page. Note that with PartitionAlloc Everywhere most Chromium allocations don't actually go through the Windows heap and are therefore unaffected by Application Verifier. You can check the undocumented 'Cuzz' checkbox in Application Verifier to get the Windows thread scheduler to add some extra randomness in order to help expose race conditions in your code. To put a breakpoint on CreateFile(), add this break point: {,,kernel32.dll}_CreateFileW@28 {,,kernel32.dll} specifies the DLL (context operator). _ prefix means extern "C". @28 postfix means _stdcall with the stack pop at the end of the function. i.e. the number of arguments in BYTES. You can use DebugView from SysInternals or sawbuck to view LOG() messages that normally go to stderr on POSIX.
“The Chromium Logo The Chromium Projects Home Chromium ChromiumOS Quick Links Report Bugs Discuss Other Sites Chromium Blog Google Chrome Extensions Except As Otherwise Noted, The Content Of This Page Is Licensed Under A Creative Commons Attribution 2.5 License, And Examples Are Licensed Under The BSD License. Privacy Edit This Page For Developers > How-Tos > Debugging Chromium On Windows First See Get The Code For Checkout And Build Instructions. Getting Started You Can Use Visual Studio's Built-in Debugger Or WinDBG To Debug Chromium. You Don't Need To Use The IDE To Build In Order To Use The Debugger: Autoninja Is Used To Build Chromium And Most Developers Invoke It From A Command Prompt, And Then Open The IDE For Debugging As Necessary. To Start Debugging An Already-built Executable With Visual Studio Just Launch Visual Studio (2019 Or Higher) And Select File-> Open-> Project/Solution (Ctrl+Shift+O) And Select The Executable Of Interest. This Will Create A Solution With That Executable As The 'project'. You Can Then Launch The Debugger With F5 Or F11 Or From The Debug Menu. If You Right-click On The Executable In Solution Explorer And Select Properties Then You Can Edit Things Such As The Executable Path, Command-line Arguments, And Working Directory. You Can Add Additional Executables To The Solution By Using File-> Add-> Existing Project And Selecting Another Already-built Executable. You Can Select Which One To Debug By Right-clicking On One Of Them In Solution Explorer And Selecting Set As Startup Project. When Your Solution File Is Customized To Your Taste You Can Save It To A Directory Such As Out\solutions. Saving It There Helps Ensure That Relative Paths To Source Files, Printed From Build Commands, Will Correctly Identify The Source Files. The Tools Menu Can Be Used To Add Commands To Do Things Like Invoke Autoninja To Build Chrome, Compile The Selected Source File, Or Other Things. Visual Studio 2017 Is Not Recommended For Debugging Of Chromium - Use A Newer Version For Best Performance And Stability. Symbol_level=2 Is The Default On Windows And Gives Full Debugging Information With Types, Locals, Globals, Function Names, And Source/line Information. Symbol_level=1 Creates Smaller PDBs With Just Function Names, And Source/line Information - Source-level Debugging Is Still Supported (new From June 2019), But Local Variables And Type Information Are Missing. Symbol_level=0 Gives Extremely Limited Debugging Abilities, Mostly Just Viewing Call Stacks When Chromium Crashes. Browsing Source Code If You Use A Solution File Generated By Gn (gn Gen --ide=vs) Then Intellisense May Help You Navigate The Code. If This Doesn't Work Or If You Use A Solution Created As Above Then You May Want To Install VsChromium To Help Navigate The Code, As Well As Using Https://source.chromium.org. Profiles It's A Good Idea To Use A Different Chrome Profile For Your Debugging. If You Are Debugging Google Chrome Branded Builds, Or Use A Chromium Build As Your Primary Browser, The Profiles Can Collide So You Can't Run Both At Once, And Your Stable Browser Might See Profile Versions From The Future (Google Chrome And Chromium Use Different Profile Directories By Default So Won't Collide). Use The Command-line Option: --user-data-dir=C:\tmp\my_debug_profile (replace The Path As Necessary) Using The IDE, Go To The Debugging Tab Of The Properties Of The Chrome Project, And Set The Command Arguments. Chrome Debug Log Enable Chrome Debug Logging To A File By Passing --enable-logging --v=1 Command-line Flags At Startup. Debug Builds Place The Chrome_debug.log File In The Out\Debug Directory. Release Builds Place The File In The Top Level Of The User Data Chromium App Directory, Which Is OS-version-dependent. For More Information, See Logging And User Data Directory Details. Symbol Server If You Are Debugging Official Google Chrome Release Builds, Use The Symbol Server: Https://chromium-browser-symsrv.commondatastorage.googleapis.com In Visual Studio, This Goes In Tools > Options Under Debugging > Symbols. You Should Set Up A Local Cache In A Empty Directory On Your Computer. In Windbg You Can Add This To Your Symbol Server Search Path With The Command Below, Where C:\symbols Is A Local Cache Directory: .sympath+ SRV\*C:\symbols\*https://chromium-browser-symsrv.commondatastorage.googleapis.com Alternately, You Can Set The _NT_SYMBOL_PATH Environment Variable To Include Both The Microsoft And Google Symbol Servers - VS, Windbg, And Other Tools Should Both Respect This Environment Variable: _NT_SYMBOL_PATH=SRV\*C:\symbols\*https://msdl.microsoft.com/download/symbols;SRV\*C:\symbols\*https://chromium-browser-symsrv.commondatastorage.googleapis.com Note That Symbol Servers Will Let The Debuggers Download Both The PE Files (DLLs And EXEs) And The PDB Files. Chrome Often Loads Third Party Libraries And Partial Symbols For Some Of These Are Also Public. For Example: AMD: Https://download.amd.com/dir/bin Nvidia: Https://driver-symbols.nvidia.com/ Intel: Https://software.intel.com/sites/downloads/symbols/ For Example, For Completeness, The Following Symbol Server Environment Variable Will Resolve All Of The Above Sources - But This Is More Than Is Normally Needed: _NT_SYMBOL_PATH=SRV\*C:\symbols\*https://msdl.microsoft.com/download/symbols;SRV\*C:\symbols\*https://chromium-browser-symsrv.commondatastorage.googleapis.com;SRV\*C:\symbols\*https://download.amd.com/dir/bin;SRV\*C:\symbols\*https://driver-symbols.nvidia.com/;SRV\*C:\symbols\*https://software.intel.com/sites/downloads/symbols/ Source Indexing You Should Set Up Source Indexing In Your Debugger (.srcfix In Windbg, Tools-> Options-> Debugging-> General-> Enable Source Server Support In Visual Studio) So That The Correct Source Files Will Automatically Be Downloaded Based On Information In The Downloaded Symbols. Additionally, You Must Have Python In Your Path In Order For The Command That Fetches Source Files To Succeed; Launching The Debugger From The Same Environment As Where You Build Chromium Is An Easy Way To Ensure It's Present. This Is Highly Recommended When Debugging Released Google Chrome Builds Or Looking At Crash Dumps. Having The Correct Version Of The Source Files Automatically Show Up Saves Significant Time So You Should Definitely Set This. Multi-process Issues Chromium Can Be Challenging To Debug Because Of Its Multi-process Architecture. When You Select Run In The Debugger, Only The Main Browser Process Will Be Debugged. The Code That Actually Renders Web Pages (the Renderer) And The Plugins Will Be In Separate Processes That's Not (yet!) Being Debugged. The ProcessExplorer Tool Has A Process Tree View Where You Can See How These Processes Are Related. You Can Also Get The Process IDs Associated With Each Tab From The Chrome Task Manager (right-click On An Empty Area Of The Window Title Bar To Open). Automatically Attach To Child Processes There Are Two Visual Studio Extensions That Enable The Debugger To Automatically Attach To All Chrome Processes, So You Can Debug All Of Chrome At Once. Microsoft's Child Process Debugging Power Tool Is A Standalone Extension For This, And VsChromium Is Another Option That Bundles Many Other Additional Features. In Addition To Installing One Of These Extensions, You Must Run Visual Studio As Administrator, Or It Will Silently Fail To Attach To Some Of Chrome's Child Processes. Single-process Mode One Way To Debug Issues Is To Run Chromium In Single-process Mode. This Will Allow You To See The Entire State Of The Program Without Extra Work (although It Will Still Have Many Threads). To Use Single-process Mode, Add The Command-line Flag --single-process This Approach Isn't Perfect Because Some Problems Won't Manifest Themselves In This Mode And Some Features Don't Work And Worker Threads Are Still Spawned Into New Processes. Manually Attaching To A Child Process You Can Attach To The Running Child Processes With The Debugger. Select Tools > Attach To Process And Click The Chrome.exe Process You Want To Attach To. Before Attaching, Make Sure You Have Selected Only Native Code When Attaching To The Process This Is Done By Clicking Select... In The Attach To Process Window And Only Checking Native. If You Forget This, It May Attempt To Attach In "WebKit" Mode To Debug JavaScript, And You'll Get An Error Message "An Operation Is Not Legal In The Current State." You Can Now Debug The Two Processes As If They Were One. When You Are Debugging Multiple Processes, Open The Debug > Windows > Processes Window To Switch Between Them. Sometimes You Are Debugging Something That Only Happens On Startup, And Want To See The Child Process As Soon As It Starts. Use: --renderer-startup-dialog --no-sandbox You Have To Disable The Sandbox Or The Dialog Box Will Be Prohibited From Showing. When The Dialog Appears, Visit Tools > Attach To Process And Attach To The Process Showing The Renderer Startup Dialog. Now You're Debugging In The Renderer And Can Continue Execution By Pressing OK In The Dialog. Startup Dialogs Also Exist For Other Child Process Types: --gpu-startup-dialog, --ppapi-startup-dialog, --utility-startup-dialog, --plugin-startup-dialog (for NPAPI). For Utilities, You Can Add A Service Type --utility-startup-dialog=data_decoder.mojom.DataDecoderService. You Can Also Try The Vs-chromium Plug-in To Attach To The Right Processes. Semi-automatically Attaching The Debugger To Child Processes The Following Flags Cause Child Processes To Wait For 60 Seconds In A Busy Loop For A Debugger To Attach To The Process. Once Either Condition Is True, It Continues On; No Exception Is Thrown. --wait-for-debugger-children[=filter] The Filter, If Provided, Will Fire Only If It Matches The --type Parameter To The Process. Values Include Renderer, Plugin (for NPAPI), Ppapi, Gpu-process, And Utility. When Using This Option, It May Be Helpful To Limit The Number Of Renderer Processes Spawned, Using: --renderer-process-limit=1 Image File Execution Options Using Image File Execution Options (IFEO) Will Not Work Because CreateProcess() Returns The Handle To The Debugger Process Instead Of The Intended Child Process. There Are Also Issues With The Sandbox. Time Travel Debugging You Can Do Time Travel Debugging Using WinDbg Preview (must Be Installed From The Microsoft Store). This Lets You Execute A Program Forward And Backwards. After Capturing A Trace, You Can Set Breakpoints And Step Through Code As Normal, But Also Provides 'backwards' Commands (g-, T-, P-) So That You Can Go Back And Forth Through The Execution. It Is Especially Useful To Set Data Breakpoints (ba Command) And Reverse Continuing, So You Can See When A Certain Variable Was Last Changed To Its Current Value. Chromium Specifics: The Type Of Injection The Time Travel Tracer Needs To Perform Is Incompatible With The Chromium Sandbox. In Order To Record A Trace, You'll Need To Run With --no-sandbox. Chromium Cannot Run Elevated With Administrator Privileges, So The "Launch Executable (advance)" Option Won't Work, You'll Need To Attach After The Process Has Already Launched Via The Checkbox In The Bottom Right. If You Need To Record Startup-like Things, You'll Have To Use --{browser,gpu,renderer,utility}-startup-dialog, Then Attach (and Hope The Relevant Code Hasn't Executed Before That Point). JsDbg -- Data Structure Visualization You Can Install JsDbg As A Plugin For WinDbg Or Visual Studio. It Interactively Lets You Look At Data Structures (such As The DOM Tree, Accessibility Tree, Layout Object Tree, And Others) In A Web Browser As You Debug. See The JsDbg Site For Some Screen Shots And Usage Examples. This Also Works When Examining Memory Dumps (though Not Minidumps), And Also Works Together With Time Travel Debugging. Visual Studio Hints Debug Visualizers Chrome's Custom Debug Visualizers Should Be Added To The Pdb Files And Automatically Picked Up By Visual Studio. The Definitions Are In //tools/win/DebugVisualizers If You Need To Modify Them (the BUILD.gn File There Has Additional Instructions). Don't Step Into Trivial Functions The Debugger Can Be Configured To Automatically Not Step Into Functions Based On Regular Expression. Edit Default.natstepfilter In The Following Directory: For Visual Studio 2015: C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\Packages\Debugger\Visualizers (for All Users) Or %USERPROFILE%\My Documents\Visual Studio 2015\Visualizers (for The Current User Only) For Visual Studio 2017 Pro: C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\Common7\Packages\Debugger\Visualizers (for All Users) Or %USERPROFILE%\My Documents\Visual Studio 2017\Visualizers (for The Current User Only) Add Regular Expressions Of Functions To Not Step Into. Remember To Regex-escape And XML-escape Them, E.g. < For < And \. For A Literal Dot. Example: Operator New NoStepInto Operator Delete NoStepInto Std::.* NoStepInto WTF::.*Ptr ::.* NoStepInto This File Is Read At Start Of A Debugging Session (F5), So You Don't Need To Restart Visual Studio After Changing It. More Info: Microsoft Email Thread V8 And Chromium V8 Supports Many Command-line Flags That Are Useful For Debugging. V8 Command-line Flags Can Be Set Via The Chromium Command-line Flag --js-flags; For Instance: Chrome.exe --js-flags="--trace_exception --heap_stats" Note That Some V8 Command-line Flags Exist Only In The Debug Build Of V8. For A List Of All V8 Flags Try: Chrome.exe --js-flags="--help" Graphics Debugging GPU Acceleration Of Rendering Can Be More Easily Debugged With Tools. See: Graphics Debugging In Visual Studio 2013 Graphical Debugging With NVIDIA NSight Debugging On Another Machine Sometimes It's Useful To Debug Installation And Execution On A Machine Other Than Your Primary Build Box. To Run The Installer On Said Other Machine, First Build The Mini_installer Target On Your Main Build Machine (e.g., Autoninja -C Out\Debug Mini_installer). Next, On The Debug Machine: Make The Build Machine's Build Volume Available On The Debug Machine Either By Mounting It Locally (e.g., Z:\) Or By Crafting A UNC Path To It (e.g., \\builder\src) Open Up A Command Prompt And Change To A Local Disk Run Src\tools\win\copy-installer.bat In The Remote Checkout By Way Of The Mount (e.g., Z:\PATHTOCHECKOUT\src\...) Or UNC Path (e.g., \\builder\src\...). This Will Copy The Installer, DLLs, And PDBs Into Your Debug Machine's C:\out Or C:\build (depending On If You're Rocking The Component=shared_library Build Or Not) Run C:\out\Debug\mini_installer.exe With The Flags Of Your Choice To Install Chrome. This Can Take Some Time, Especially On A Slow Machine. Watch The Task Manager And Wait Until Mini_installer.exe Exits Before Trying To Launch Chrome (by Way Of The Shortcut(s) Created By The Installer) For Extra Pleasure, Add C:\out\Debug To Your _NT_SYMBOL_PATH Environment Variable Consider Reading The Documentation At The Top Of Copy-installer.bat To See How You Can Run It. It Tries To Be Smart And Copy The Right Things, But You May Need To Be Explicit (e.g., "copy-installer.bat Out Debug"). It Is Safe To Re-run The Script To Copy Only Modified Files (after A Rebuild, For Example). You Can Also Use The Zip Action Of The Isolate Scripts (tools\mb\mb.py) To Package All The Files For A Target Into A Single Zip File, For Example: Python Tools\mb\mb.py Zip Out/Release Base_unittests Base_unittests.zip Finding All Memory Allocations It Is Possible To Use Heap Snapshots To Get Call Stacks On All Outstanding Allocations That Use The OS Heap. This Works Particularly Well If Heap Snapshots Are Started As Soon As The Chrome Browser Process Is Created, But Before It Starts Running. Details Can Be Found In This Batch File. However, With PartitionAlloc Everywhere Most Chromium Allocations No Longer Use The Windows Heap So This Will Only Find A Subset Of Allocations, Mostly From OS DLLs. Find Memory Leaks Note: As With Heap Snapshots The Utility Of UMDH Is Greatly Reduced Now Because PartitionAlloc Everywhere Has Mostly Replaced The Windows Heap. The Windows Heap Manager Has A Really Useful Debug Flag, Where It Can Be Asked To Capture And Store A Stack Trace With Every Allocation. The Tool To Scrape These Stack Traces Out Of Processes Is UMDH, Which Comes With WinDbg. UMDH Is Great. It Will Capture A Snapshot Of The Heap State As Many Times As You Like, And It'll Do It Fairly Quickly. You Then Run It Again Against Either A Single Snapshot, Or A Pair Of Snapshots, At Which Time It'll Symbolize The Stack Traces And Aggregate Usage Up To Unique Stack Traces. Turning On The User Stack Trace Database For Chrome.exe With Gflags.exe Makes It Run Unbearably Slowly; However, Turning On The User Stack Trace Database On For The Browser Alone Is Just Fine. While It's Possible To Turn On The User Stack Database With The "!gflag" Debugging Extension, It's Too Late To Do This By The Time The Initial Debugger Breakpoint Hits. The Only Reasonable Way To Do This Is To Launch GFlags.exe, Enable The User Stack Trace Database (per Image Below), Launch Chrome Under The Debugger. Set A Breakpont When Chrome.dll Loads With "sxe Ld Chrome.dll". Step Up, To Allow Chrome.dll To Initialize. Disable The Stack Trace Database In GFlags.exe. Continue Chrome, Optionally Detaching The Debugger. Image GFlags.exe Settings For User Mode Stack Trace Database. If You Then Ever Suffer A Browser Memory Leak, You Can Snarf A Dump Of The Process With Umdh -p: > Chrome-browser-leak-umdh-dump.txt Which Can Then Typically Be "trivially" Analyzed To Find The Culprit. Miscellaneous Note That By Default Application Verifier Only Works With Non-official Builds Of Chromium. To Use Application Verifier On Official Builds You Need To Add --disable-features=RendererCodeIntegrity To Avoid Sandbox Crashes In Renderer Processes. See Crbug.com/1004989 For Details. See Also This Page. Application Verifier Is A Free Tool From Microsoft (available As Part Of The Windows SDK) That Can Be Used To Flush Out Programming Errors. Starting With M68 Application Verifier Can Be Enabled For Chrome.exe Without Needing To Disable The Sandbox. After Adding Chrome.exe To The List Of Applications To Be Stressed You Need To Expand The List Of Basics Checks And Disable The Leak Checks. You May Also Need To Disable Handles And Locks Checks Depending On Your Graphics Driver And Specific Chrome Version, But The Eventual Goal Is To Have Chrome Run With Handles And Locks Checks Enabled. When Bugs Are Found Chrome Will Trigger A Breakpoint So Running All Chrome Processes Under A Debugger Is Recommended. Chrome Will Run Much More Slowly Because Application Verifier Puts Every Heap Allocation On A Separate Page. Note That With PartitionAlloc Everywhere Most Chromium Allocations Don't Actually Go Through The Windows Heap And Are Therefore Unaffected By Application Verifier. You Can Check The Undocumented 'Cuzz' Checkbox In Application Verifier To Get The Windows Thread Scheduler To Add Some Extra Randomness In Order To Help Expose Race Conditions In Your Code. To Put A Breakpoint On CreateFile(), Add This Break Point: {,,kernel32.dll}_CreateFileW@28 {,,kernel32.dll} Specifies The DLL (context Operator). _ Prefix Means Extern "C". @28 Postfix Means _stdcall With The Stack Pop At The End Of The Function. I.e. The Number Of Arguments In BYTES. You Can Use DebugView From SysInternals Or Sawbuck To View LOG() Messages That Normally Go To Stderr On POSIX.” Metadata:
- Title: ➤ The Chromium Logo The Chromium Projects Home Chromium ChromiumOS Quick Links Report Bugs Discuss Other Sites Chromium Blog Google Chrome Extensions Except As Otherwise Noted, The Content Of This Page Is Licensed Under A Creative Commons Attribution 2.5 License, And Examples Are Licensed Under The BSD License. Privacy Edit This Page For Developers > How-Tos > Debugging Chromium On Windows First See Get The Code For Checkout And Build Instructions. Getting Started You Can Use Visual Studio's Built-in Debugger Or WinDBG To Debug Chromium. You Don't Need To Use The IDE To Build In Order To Use The Debugger: Autoninja Is Used To Build Chromium And Most Developers Invoke It From A Command Prompt, And Then Open The IDE For Debugging As Necessary. To Start Debugging An Already-built Executable With Visual Studio Just Launch Visual Studio (2019 Or Higher) And Select File-> Open-> Project/Solution (Ctrl+Shift+O) And Select The Executable Of Interest. This Will Create A Solution With That Executable As The 'project'. You Can Then Launch The Debugger With F5 Or F11 Or From The Debug Menu. If You Right-click On The Executable In Solution Explorer And Select Properties Then You Can Edit Things Such As The Executable Path, Command-line Arguments, And Working Directory. You Can Add Additional Executables To The Solution By Using File-> Add-> Existing Project And Selecting Another Already-built Executable. You Can Select Which One To Debug By Right-clicking On One Of Them In Solution Explorer And Selecting Set As Startup Project. When Your Solution File Is Customized To Your Taste You Can Save It To A Directory Such As Out\solutions. Saving It There Helps Ensure That Relative Paths To Source Files, Printed From Build Commands, Will Correctly Identify The Source Files. The Tools Menu Can Be Used To Add Commands To Do Things Like Invoke Autoninja To Build Chrome, Compile The Selected Source File, Or Other Things. Visual Studio 2017 Is Not Recommended For Debugging Of Chromium - Use A Newer Version For Best Performance And Stability. Symbol_level=2 Is The Default On Windows And Gives Full Debugging Information With Types, Locals, Globals, Function Names, And Source/line Information. Symbol_level=1 Creates Smaller PDBs With Just Function Names, And Source/line Information - Source-level Debugging Is Still Supported (new From June 2019), But Local Variables And Type Information Are Missing. Symbol_level=0 Gives Extremely Limited Debugging Abilities, Mostly Just Viewing Call Stacks When Chromium Crashes. Browsing Source Code If You Use A Solution File Generated By Gn (gn Gen --ide=vs) Then Intellisense May Help You Navigate The Code. If This Doesn't Work Or If You Use A Solution Created As Above Then You May Want To Install VsChromium To Help Navigate The Code, As Well As Using Https://source.chromium.org. Profiles It's A Good Idea To Use A Different Chrome Profile For Your Debugging. If You Are Debugging Google Chrome Branded Builds, Or Use A Chromium Build As Your Primary Browser, The Profiles Can Collide So You Can't Run Both At Once, And Your Stable Browser Might See Profile Versions From The Future (Google Chrome And Chromium Use Different Profile Directories By Default So Won't Collide). Use The Command-line Option: --user-data-dir=C:\tmp\my_debug_profile (replace The Path As Necessary) Using The IDE, Go To The Debugging Tab Of The Properties Of The Chrome Project, And Set The Command Arguments. Chrome Debug Log Enable Chrome Debug Logging To A File By Passing --enable-logging --v=1 Command-line Flags At Startup. Debug Builds Place The Chrome_debug.log File In The Out\Debug Directory. Release Builds Place The File In The Top Level Of The User Data Chromium App Directory, Which Is OS-version-dependent. For More Information, See Logging And User Data Directory Details. Symbol Server If You Are Debugging Official Google Chrome Release Builds, Use The Symbol Server: Https://chromium-browser-symsrv.commondatastorage.googleapis.com In Visual Studio, This Goes In Tools > Options Under Debugging > Symbols. You Should Set Up A Local Cache In A Empty Directory On Your Computer. In Windbg You Can Add This To Your Symbol Server Search Path With The Command Below, Where C:\symbols Is A Local Cache Directory: .sympath+ SRV\*C:\symbols\*https://chromium-browser-symsrv.commondatastorage.googleapis.com Alternately, You Can Set The _NT_SYMBOL_PATH Environment Variable To Include Both The Microsoft And Google Symbol Servers - VS, Windbg, And Other Tools Should Both Respect This Environment Variable: _NT_SYMBOL_PATH=SRV\*C:\symbols\*https://msdl.microsoft.com/download/symbols;SRV\*C:\symbols\*https://chromium-browser-symsrv.commondatastorage.googleapis.com Note That Symbol Servers Will Let The Debuggers Download Both The PE Files (DLLs And EXEs) And The PDB Files. Chrome Often Loads Third Party Libraries And Partial Symbols For Some Of These Are Also Public. For Example: AMD: Https://download.amd.com/dir/bin Nvidia: Https://driver-symbols.nvidia.com/ Intel: Https://software.intel.com/sites/downloads/symbols/ For Example, For Completeness, The Following Symbol Server Environment Variable Will Resolve All Of The Above Sources - But This Is More Than Is Normally Needed: _NT_SYMBOL_PATH=SRV\*C:\symbols\*https://msdl.microsoft.com/download/symbols;SRV\*C:\symbols\*https://chromium-browser-symsrv.commondatastorage.googleapis.com;SRV\*C:\symbols\*https://download.amd.com/dir/bin;SRV\*C:\symbols\*https://driver-symbols.nvidia.com/;SRV\*C:\symbols\*https://software.intel.com/sites/downloads/symbols/ Source Indexing You Should Set Up Source Indexing In Your Debugger (.srcfix In Windbg, Tools-> Options-> Debugging-> General-> Enable Source Server Support In Visual Studio) So That The Correct Source Files Will Automatically Be Downloaded Based On Information In The Downloaded Symbols. Additionally, You Must Have Python In Your Path In Order For The Command That Fetches Source Files To Succeed; Launching The Debugger From The Same Environment As Where You Build Chromium Is An Easy Way To Ensure It's Present. This Is Highly Recommended When Debugging Released Google Chrome Builds Or Looking At Crash Dumps. Having The Correct Version Of The Source Files Automatically Show Up Saves Significant Time So You Should Definitely Set This. Multi-process Issues Chromium Can Be Challenging To Debug Because Of Its Multi-process Architecture. When You Select Run In The Debugger, Only The Main Browser Process Will Be Debugged. The Code That Actually Renders Web Pages (the Renderer) And The Plugins Will Be In Separate Processes That's Not (yet!) Being Debugged. The ProcessExplorer Tool Has A Process Tree View Where You Can See How These Processes Are Related. You Can Also Get The Process IDs Associated With Each Tab From The Chrome Task Manager (right-click On An Empty Area Of The Window Title Bar To Open). Automatically Attach To Child Processes There Are Two Visual Studio Extensions That Enable The Debugger To Automatically Attach To All Chrome Processes, So You Can Debug All Of Chrome At Once. Microsoft's Child Process Debugging Power Tool Is A Standalone Extension For This, And VsChromium Is Another Option That Bundles Many Other Additional Features. In Addition To Installing One Of These Extensions, You Must Run Visual Studio As Administrator, Or It Will Silently Fail To Attach To Some Of Chrome's Child Processes. Single-process Mode One Way To Debug Issues Is To Run Chromium In Single-process Mode. This Will Allow You To See The Entire State Of The Program Without Extra Work (although It Will Still Have Many Threads). To Use Single-process Mode, Add The Command-line Flag --single-process This Approach Isn't Perfect Because Some Problems Won't Manifest Themselves In This Mode And Some Features Don't Work And Worker Threads Are Still Spawned Into New Processes. Manually Attaching To A Child Process You Can Attach To The Running Child Processes With The Debugger. Select Tools > Attach To Process And Click The Chrome.exe Process You Want To Attach To. Before Attaching, Make Sure You Have Selected Only Native Code When Attaching To The Process This Is Done By Clicking Select... In The Attach To Process Window And Only Checking Native. If You Forget This, It May Attempt To Attach In "WebKit" Mode To Debug JavaScript, And You'll Get An Error Message "An Operation Is Not Legal In The Current State." You Can Now Debug The Two Processes As If They Were One. When You Are Debugging Multiple Processes, Open The Debug > Windows > Processes Window To Switch Between Them. Sometimes You Are Debugging Something That Only Happens On Startup, And Want To See The Child Process As Soon As It Starts. Use: --renderer-startup-dialog --no-sandbox You Have To Disable The Sandbox Or The Dialog Box Will Be Prohibited From Showing. When The Dialog Appears, Visit Tools > Attach To Process And Attach To The Process Showing The Renderer Startup Dialog. Now You're Debugging In The Renderer And Can Continue Execution By Pressing OK In The Dialog. Startup Dialogs Also Exist For Other Child Process Types: --gpu-startup-dialog, --ppapi-startup-dialog, --utility-startup-dialog, --plugin-startup-dialog (for NPAPI). For Utilities, You Can Add A Service Type --utility-startup-dialog=data_decoder.mojom.DataDecoderService. You Can Also Try The Vs-chromium Plug-in To Attach To The Right Processes. Semi-automatically Attaching The Debugger To Child Processes The Following Flags Cause Child Processes To Wait For 60 Seconds In A Busy Loop For A Debugger To Attach To The Process. Once Either Condition Is True, It Continues On; No Exception Is Thrown. --wait-for-debugger-children[=filter] The Filter, If Provided, Will Fire Only If It Matches The --type Parameter To The Process. Values Include Renderer, Plugin (for NPAPI), Ppapi, Gpu-process, And Utility. When Using This Option, It May Be Helpful To Limit The Number Of Renderer Processes Spawned, Using: --renderer-process-limit=1 Image File Execution Options Using Image File Execution Options (IFEO) Will Not Work Because CreateProcess() Returns The Handle To The Debugger Process Instead Of The Intended Child Process. There Are Also Issues With The Sandbox. Time Travel Debugging You Can Do Time Travel Debugging Using WinDbg Preview (must Be Installed From The Microsoft Store). This Lets You Execute A Program Forward And Backwards. After Capturing A Trace, You Can Set Breakpoints And Step Through Code As Normal, But Also Provides 'backwards' Commands (g-, T-, P-) So That You Can Go Back And Forth Through The Execution. It Is Especially Useful To Set Data Breakpoints (ba Command) And Reverse Continuing, So You Can See When A Certain Variable Was Last Changed To Its Current Value. Chromium Specifics: The Type Of Injection The Time Travel Tracer Needs To Perform Is Incompatible With The Chromium Sandbox. In Order To Record A Trace, You'll Need To Run With --no-sandbox. Chromium Cannot Run Elevated With Administrator Privileges, So The "Launch Executable (advance)" Option Won't Work, You'll Need To Attach After The Process Has Already Launched Via The Checkbox In The Bottom Right. If You Need To Record Startup-like Things, You'll Have To Use --{browser,gpu,renderer,utility}-startup-dialog, Then Attach (and Hope The Relevant Code Hasn't Executed Before That Point). JsDbg -- Data Structure Visualization You Can Install JsDbg As A Plugin For WinDbg Or Visual Studio. It Interactively Lets You Look At Data Structures (such As The DOM Tree, Accessibility Tree, Layout Object Tree, And Others) In A Web Browser As You Debug. See The JsDbg Site For Some Screen Shots And Usage Examples. This Also Works When Examining Memory Dumps (though Not Minidumps), And Also Works Together With Time Travel Debugging. Visual Studio Hints Debug Visualizers Chrome's Custom Debug Visualizers Should Be Added To The Pdb Files And Automatically Picked Up By Visual Studio. The Definitions Are In //tools/win/DebugVisualizers If You Need To Modify Them (the BUILD.gn File There Has Additional Instructions). Don't Step Into Trivial Functions The Debugger Can Be Configured To Automatically Not Step Into Functions Based On Regular Expression. Edit Default.natstepfilter In The Following Directory: For Visual Studio 2015: C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\Packages\Debugger\Visualizers (for All Users) Or %USERPROFILE%\My Documents\Visual Studio 2015\Visualizers (for The Current User Only) For Visual Studio 2017 Pro: C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\Common7\Packages\Debugger\Visualizers (for All Users) Or %USERPROFILE%\My Documents\Visual Studio 2017\Visualizers (for The Current User Only) Add Regular Expressions Of Functions To Not Step Into. Remember To Regex-escape And XML-escape Them, E.g. < For < And \. For A Literal Dot. Example: Operator New NoStepInto Operator Delete NoStepInto Std::.* NoStepInto WTF::.*Ptr ::.* NoStepInto This File Is Read At Start Of A Debugging Session (F5), So You Don't Need To Restart Visual Studio After Changing It. More Info: Microsoft Email Thread V8 And Chromium V8 Supports Many Command-line Flags That Are Useful For Debugging. V8 Command-line Flags Can Be Set Via The Chromium Command-line Flag --js-flags; For Instance: Chrome.exe --js-flags="--trace_exception --heap_stats" Note That Some V8 Command-line Flags Exist Only In The Debug Build Of V8. For A List Of All V8 Flags Try: Chrome.exe --js-flags="--help" Graphics Debugging GPU Acceleration Of Rendering Can Be More Easily Debugged With Tools. See: Graphics Debugging In Visual Studio 2013 Graphical Debugging With NVIDIA NSight Debugging On Another Machine Sometimes It's Useful To Debug Installation And Execution On A Machine Other Than Your Primary Build Box. To Run The Installer On Said Other Machine, First Build The Mini_installer Target On Your Main Build Machine (e.g., Autoninja -C Out\Debug Mini_installer). Next, On The Debug Machine: Make The Build Machine's Build Volume Available On The Debug Machine Either By Mounting It Locally (e.g., Z:\) Or By Crafting A UNC Path To It (e.g., \\builder\src) Open Up A Command Prompt And Change To A Local Disk Run Src\tools\win\copy-installer.bat In The Remote Checkout By Way Of The Mount (e.g., Z:\PATHTOCHECKOUT\src\...) Or UNC Path (e.g., \\builder\src\...). This Will Copy The Installer, DLLs, And PDBs Into Your Debug Machine's C:\out Or C:\build (depending On If You're Rocking The Component=shared_library Build Or Not) Run C:\out\Debug\mini_installer.exe With The Flags Of Your Choice To Install Chrome. This Can Take Some Time, Especially On A Slow Machine. Watch The Task Manager And Wait Until Mini_installer.exe Exits Before Trying To Launch Chrome (by Way Of The Shortcut(s) Created By The Installer) For Extra Pleasure, Add C:\out\Debug To Your _NT_SYMBOL_PATH Environment Variable Consider Reading The Documentation At The Top Of Copy-installer.bat To See How You Can Run It. It Tries To Be Smart And Copy The Right Things, But You May Need To Be Explicit (e.g., "copy-installer.bat Out Debug"). It Is Safe To Re-run The Script To Copy Only Modified Files (after A Rebuild, For Example). You Can Also Use The Zip Action Of The Isolate Scripts (tools\mb\mb.py) To Package All The Files For A Target Into A Single Zip File, For Example: Python Tools\mb\mb.py Zip Out/Release Base_unittests Base_unittests.zip Finding All Memory Allocations It Is Possible To Use Heap Snapshots To Get Call Stacks On All Outstanding Allocations That Use The OS Heap. This Works Particularly Well If Heap Snapshots Are Started As Soon As The Chrome Browser Process Is Created, But Before It Starts Running. Details Can Be Found In This Batch File. However, With PartitionAlloc Everywhere Most Chromium Allocations No Longer Use The Windows Heap So This Will Only Find A Subset Of Allocations, Mostly From OS DLLs. Find Memory Leaks Note: As With Heap Snapshots The Utility Of UMDH Is Greatly Reduced Now Because PartitionAlloc Everywhere Has Mostly Replaced The Windows Heap. The Windows Heap Manager Has A Really Useful Debug Flag, Where It Can Be Asked To Capture And Store A Stack Trace With Every Allocation. The Tool To Scrape These Stack Traces Out Of Processes Is UMDH, Which Comes With WinDbg. UMDH Is Great. It Will Capture A Snapshot Of The Heap State As Many Times As You Like, And It'll Do It Fairly Quickly. You Then Run It Again Against Either A Single Snapshot, Or A Pair Of Snapshots, At Which Time It'll Symbolize The Stack Traces And Aggregate Usage Up To Unique Stack Traces. Turning On The User Stack Trace Database For Chrome.exe With Gflags.exe Makes It Run Unbearably Slowly; However, Turning On The User Stack Trace Database On For The Browser Alone Is Just Fine. While It's Possible To Turn On The User Stack Database With The "!gflag" Debugging Extension, It's Too Late To Do This By The Time The Initial Debugger Breakpoint Hits. The Only Reasonable Way To Do This Is To Launch GFlags.exe, Enable The User Stack Trace Database (per Image Below), Launch Chrome Under The Debugger. Set A Breakpont When Chrome.dll Loads With "sxe Ld Chrome.dll". Step Up, To Allow Chrome.dll To Initialize. Disable The Stack Trace Database In GFlags.exe. Continue Chrome, Optionally Detaching The Debugger. Image GFlags.exe Settings For User Mode Stack Trace Database. If You Then Ever Suffer A Browser Memory Leak, You Can Snarf A Dump Of The Process With Umdh -p: > Chrome-browser-leak-umdh-dump.txt Which Can Then Typically Be "trivially" Analyzed To Find The Culprit. Miscellaneous Note That By Default Application Verifier Only Works With Non-official Builds Of Chromium. To Use Application Verifier On Official Builds You Need To Add --disable-features=RendererCodeIntegrity To Avoid Sandbox Crashes In Renderer Processes. See Crbug.com/1004989 For Details. See Also This Page. Application Verifier Is A Free Tool From Microsoft (available As Part Of The Windows SDK) That Can Be Used To Flush Out Programming Errors. Starting With M68 Application Verifier Can Be Enabled For Chrome.exe Without Needing To Disable The Sandbox. After Adding Chrome.exe To The List Of Applications To Be Stressed You Need To Expand The List Of Basics Checks And Disable The Leak Checks. You May Also Need To Disable Handles And Locks Checks Depending On Your Graphics Driver And Specific Chrome Version, But The Eventual Goal Is To Have Chrome Run With Handles And Locks Checks Enabled. When Bugs Are Found Chrome Will Trigger A Breakpoint So Running All Chrome Processes Under A Debugger Is Recommended. Chrome Will Run Much More Slowly Because Application Verifier Puts Every Heap Allocation On A Separate Page. Note That With PartitionAlloc Everywhere Most Chromium Allocations Don't Actually Go Through The Windows Heap And Are Therefore Unaffected By Application Verifier. You Can Check The Undocumented 'Cuzz' Checkbox In Application Verifier To Get The Windows Thread Scheduler To Add Some Extra Randomness In Order To Help Expose Race Conditions In Your Code. To Put A Breakpoint On CreateFile(), Add This Break Point: {,,kernel32.dll}_CreateFileW@28 {,,kernel32.dll} Specifies The DLL (context Operator). _ Prefix Means Extern "C". @28 Postfix Means _stdcall With The Stack Pop At The End Of The Function. I.e. The Number Of Arguments In BYTES. You Can Use DebugView From SysInternals Or Sawbuck To View LOG() Messages That Normally Go To Stderr On POSIX.
“The Chromium Logo The Chromium Projects Home Chromium ChromiumOS Quick Links Report Bugs Discuss Other Sites Chromium Blog Google Chrome Extensions Except As Otherwise Noted, The Content Of This Page Is Licensed Under A Creative Commons Attribution 2.5 License, And Examples Are Licensed Under The BSD License. Privacy Edit This Page For Developers > How-Tos > Debugging Chromium On Windows First See Get The Code For Checkout And Build Instructions. Getting Started You Can Use Visual Studio's Built-in Debugger Or WinDBG To Debug Chromium. You Don't Need To Use The IDE To Build In Order To Use The Debugger: Autoninja Is Used To Build Chromium And Most Developers Invoke It From A Command Prompt, And Then Open The IDE For Debugging As Necessary. To Start Debugging An Already-built Executable With Visual Studio Just Launch Visual Studio (2019 Or Higher) And Select File-> Open-> Project/Solution (Ctrl+Shift+O) And Select The Executable Of Interest. This Will Create A Solution With That Executable As The 'project'. You Can Then Launch The Debugger With F5 Or F11 Or From The Debug Menu. If You Right-click On The Executable In Solution Explorer And Select Properties Then You Can Edit Things Such As The Executable Path, Command-line Arguments, And Working Directory. You Can Add Additional Executables To The Solution By Using File-> Add-> Existing Project And Selecting Another Already-built Executable. You Can Select Which One To Debug By Right-clicking On One Of Them In Solution Explorer And Selecting Set As Startup Project. When Your Solution File Is Customized To Your Taste You Can Save It To A Directory Such As Out\solutions. Saving It There Helps Ensure That Relative Paths To Source Files, Printed From Build Commands, Will Correctly Identify The Source Files. The Tools Menu Can Be Used To Add Commands To Do Things Like Invoke Autoninja To Build Chrome, Compile The Selected Source File, Or Other Things. Visual Studio 2017 Is Not Recommended For Debugging Of Chromium - Use A Newer Version For Best Performance And Stability. Symbol_level=2 Is The Default On Windows And Gives Full Debugging Information With Types, Locals, Globals, Function Names, And Source/line Information. Symbol_level=1 Creates Smaller PDBs With Just Function Names, And Source/line Information - Source-level Debugging Is Still Supported (new From June 2019), But Local Variables And Type Information Are Missing. Symbol_level=0 Gives Extremely Limited Debugging Abilities, Mostly Just Viewing Call Stacks When Chromium Crashes. Browsing Source Code If You Use A Solution File Generated By Gn (gn Gen --ide=vs) Then Intellisense May Help You Navigate The Code. If This Doesn't Work Or If You Use A Solution Created As Above Then You May Want To Install VsChromium To Help Navigate The Code, As Well As Using Https://source.chromium.org. Profiles It's A Good Idea To Use A Different Chrome Profile For Your Debugging. If You Are Debugging Google Chrome Branded Builds, Or Use A Chromium Build As Your Primary Browser, The Profiles Can Collide So You Can't Run Both At Once, And Your Stable Browser Might See Profile Versions From The Future (Google Chrome And Chromium Use Different Profile Directories By Default So Won't Collide). Use The Command-line Option: --user-data-dir=C:\tmp\my_debug_profile (replace The Path As Necessary) Using The IDE, Go To The Debugging Tab Of The Properties Of The Chrome Project, And Set The Command Arguments. Chrome Debug Log Enable Chrome Debug Logging To A File By Passing --enable-logging --v=1 Command-line Flags At Startup. Debug Builds Place The Chrome_debug.log File In The Out\Debug Directory. Release Builds Place The File In The Top Level Of The User Data Chromium App Directory, Which Is OS-version-dependent. For More Information, See Logging And User Data Directory Details. Symbol Server If You Are Debugging Official Google Chrome Release Builds, Use The Symbol Server: Https://chromium-browser-symsrv.commondatastorage.googleapis.com In Visual Studio, This Goes In Tools > Options Under Debugging > Symbols. You Should Set Up A Local Cache In A Empty Directory On Your Computer. In Windbg You Can Add This To Your Symbol Server Search Path With The Command Below, Where C:\symbols Is A Local Cache Directory: .sympath+ SRV\*C:\symbols\*https://chromium-browser-symsrv.commondatastorage.googleapis.com Alternately, You Can Set The _NT_SYMBOL_PATH Environment Variable To Include Both The Microsoft And Google Symbol Servers - VS, Windbg, And Other Tools Should Both Respect This Environment Variable: _NT_SYMBOL_PATH=SRV\*C:\symbols\*https://msdl.microsoft.com/download/symbols;SRV\*C:\symbols\*https://chromium-browser-symsrv.commondatastorage.googleapis.com Note That Symbol Servers Will Let The Debuggers Download Both The PE Files (DLLs And EXEs) And The PDB Files. Chrome Often Loads Third Party Libraries And Partial Symbols For Some Of These Are Also Public. For Example: AMD: Https://download.amd.com/dir/bin Nvidia: Https://driver-symbols.nvidia.com/ Intel: Https://software.intel.com/sites/downloads/symbols/ For Example, For Completeness, The Following Symbol Server Environment Variable Will Resolve All Of The Above Sources - But This Is More Than Is Normally Needed: _NT_SYMBOL_PATH=SRV\*C:\symbols\*https://msdl.microsoft.com/download/symbols;SRV\*C:\symbols\*https://chromium-browser-symsrv.commondatastorage.googleapis.com;SRV\*C:\symbols\*https://download.amd.com/dir/bin;SRV\*C:\symbols\*https://driver-symbols.nvidia.com/;SRV\*C:\symbols\*https://software.intel.com/sites/downloads/symbols/ Source Indexing You Should Set Up Source Indexing In Your Debugger (.srcfix In Windbg, Tools-> Options-> Debugging-> General-> Enable Source Server Support In Visual Studio) So That The Correct Source Files Will Automatically Be Downloaded Based On Information In The Downloaded Symbols. Additionally, You Must Have Python In Your Path In Order For The Command That Fetches Source Files To Succeed; Launching The Debugger From The Same Environment As Where You Build Chromium Is An Easy Way To Ensure It's Present. This Is Highly Recommended When Debugging Released Google Chrome Builds Or Looking At Crash Dumps. Having The Correct Version Of The Source Files Automatically Show Up Saves Significant Time So You Should Definitely Set This. Multi-process Issues Chromium Can Be Challenging To Debug Because Of Its Multi-process Architecture. When You Select Run In The Debugger, Only The Main Browser Process Will Be Debugged. The Code That Actually Renders Web Pages (the Renderer) And The Plugins Will Be In Separate Processes That's Not (yet!) Being Debugged. The ProcessExplorer Tool Has A Process Tree View Where You Can See How These Processes Are Related. You Can Also Get The Process IDs Associated With Each Tab From The Chrome Task Manager (right-click On An Empty Area Of The Window Title Bar To Open). Automatically Attach To Child Processes There Are Two Visual Studio Extensions That Enable The Debugger To Automatically Attach To All Chrome Processes, So You Can Debug All Of Chrome At Once. Microsoft's Child Process Debugging Power Tool Is A Standalone Extension For This, And VsChromium Is Another Option That Bundles Many Other Additional Features. In Addition To Installing One Of These Extensions, You Must Run Visual Studio As Administrator, Or It Will Silently Fail To Attach To Some Of Chrome's Child Processes. Single-process Mode One Way To Debug Issues Is To Run Chromium In Single-process Mode. This Will Allow You To See The Entire State Of The Program Without Extra Work (although It Will Still Have Many Threads). To Use Single-process Mode, Add The Command-line Flag --single-process This Approach Isn't Perfect Because Some Problems Won't Manifest Themselves In This Mode And Some Features Don't Work And Worker Threads Are Still Spawned Into New Processes. Manually Attaching To A Child Process You Can Attach To The Running Child Processes With The Debugger. Select Tools > Attach To Process And Click The Chrome.exe Process You Want To Attach To. Before Attaching, Make Sure You Have Selected Only Native Code When Attaching To The Process This Is Done By Clicking Select... In The Attach To Process Window And Only Checking Native. If You Forget This, It May Attempt To Attach In "WebKit" Mode To Debug JavaScript, And You'll Get An Error Message "An Operation Is Not Legal In The Current State." You Can Now Debug The Two Processes As If They Were One. When You Are Debugging Multiple Processes, Open The Debug > Windows > Processes Window To Switch Between Them. Sometimes You Are Debugging Something That Only Happens On Startup, And Want To See The Child Process As Soon As It Starts. Use: --renderer-startup-dialog --no-sandbox You Have To Disable The Sandbox Or The Dialog Box Will Be Prohibited From Showing. When The Dialog Appears, Visit Tools > Attach To Process And Attach To The Process Showing The Renderer Startup Dialog. Now You're Debugging In The Renderer And Can Continue Execution By Pressing OK In The Dialog. Startup Dialogs Also Exist For Other Child Process Types: --gpu-startup-dialog, --ppapi-startup-dialog, --utility-startup-dialog, --plugin-startup-dialog (for NPAPI). For Utilities, You Can Add A Service Type --utility-startup-dialog=data_decoder.mojom.DataDecoderService. You Can Also Try The Vs-chromium Plug-in To Attach To The Right Processes. Semi-automatically Attaching The Debugger To Child Processes The Following Flags Cause Child Processes To Wait For 60 Seconds In A Busy Loop For A Debugger To Attach To The Process. Once Either Condition Is True, It Continues On; No Exception Is Thrown. --wait-for-debugger-children[=filter] The Filter, If Provided, Will Fire Only If It Matches The --type Parameter To The Process. Values Include Renderer, Plugin (for NPAPI), Ppapi, Gpu-process, And Utility. When Using This Option, It May Be Helpful To Limit The Number Of Renderer Processes Spawned, Using: --renderer-process-limit=1 Image File Execution Options Using Image File Execution Options (IFEO) Will Not Work Because CreateProcess() Returns The Handle To The Debugger Process Instead Of The Intended Child Process. There Are Also Issues With The Sandbox. Time Travel Debugging You Can Do Time Travel Debugging Using WinDbg Preview (must Be Installed From The Microsoft Store). This Lets You Execute A Program Forward And Backwards. After Capturing A Trace, You Can Set Breakpoints And Step Through Code As Normal, But Also Provides 'backwards' Commands (g-, T-, P-) So That You Can Go Back And Forth Through The Execution. It Is Especially Useful To Set Data Breakpoints (ba Command) And Reverse Continuing, So You Can See When A Certain Variable Was Last Changed To Its Current Value. Chromium Specifics: The Type Of Injection The Time Travel Tracer Needs To Perform Is Incompatible With The Chromium Sandbox. In Order To Record A Trace, You'll Need To Run With --no-sandbox. Chromium Cannot Run Elevated With Administrator Privileges, So The "Launch Executable (advance)" Option Won't Work, You'll Need To Attach After The Process Has Already Launched Via The Checkbox In The Bottom Right. If You Need To Record Startup-like Things, You'll Have To Use --{browser,gpu,renderer,utility}-startup-dialog, Then Attach (and Hope The Relevant Code Hasn't Executed Before That Point). JsDbg -- Data Structure Visualization You Can Install JsDbg As A Plugin For WinDbg Or Visual Studio. It Interactively Lets You Look At Data Structures (such As The DOM Tree, Accessibility Tree, Layout Object Tree, And Others) In A Web Browser As You Debug. See The JsDbg Site For Some Screen Shots And Usage Examples. This Also Works When Examining Memory Dumps (though Not Minidumps), And Also Works Together With Time Travel Debugging. Visual Studio Hints Debug Visualizers Chrome's Custom Debug Visualizers Should Be Added To The Pdb Files And Automatically Picked Up By Visual Studio. The Definitions Are In //tools/win/DebugVisualizers If You Need To Modify Them (the BUILD.gn File There Has Additional Instructions). Don't Step Into Trivial Functions The Debugger Can Be Configured To Automatically Not Step Into Functions Based On Regular Expression. Edit Default.natstepfilter In The Following Directory: For Visual Studio 2015: C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\Packages\Debugger\Visualizers (for All Users) Or %USERPROFILE%\My Documents\Visual Studio 2015\Visualizers (for The Current User Only) For Visual Studio 2017 Pro: C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\Common7\Packages\Debugger\Visualizers (for All Users) Or %USERPROFILE%\My Documents\Visual Studio 2017\Visualizers (for The Current User Only) Add Regular Expressions Of Functions To Not Step Into. Remember To Regex-escape And XML-escape Them, E.g. < For < And \. For A Literal Dot. Example: Operator New NoStepInto Operator Delete NoStepInto Std::.* NoStepInto WTF::.*Ptr ::.* NoStepInto This File Is Read At Start Of A Debugging Session (F5), So You Don't Need To Restart Visual Studio After Changing It. More Info: Microsoft Email Thread V8 And Chromium V8 Supports Many Command-line Flags That Are Useful For Debugging. V8 Command-line Flags Can Be Set Via The Chromium Command-line Flag --js-flags; For Instance: Chrome.exe --js-flags="--trace_exception --heap_stats" Note That Some V8 Command-line Flags Exist Only In The Debug Build Of V8. For A List Of All V8 Flags Try: Chrome.exe --js-flags="--help" Graphics Debugging GPU Acceleration Of Rendering Can Be More Easily Debugged With Tools. See: Graphics Debugging In Visual Studio 2013 Graphical Debugging With NVIDIA NSight Debugging On Another Machine Sometimes It's Useful To Debug Installation And Execution On A Machine Other Than Your Primary Build Box. To Run The Installer On Said Other Machine, First Build The Mini_installer Target On Your Main Build Machine (e.g., Autoninja -C Out\Debug Mini_installer). Next, On The Debug Machine: Make The Build Machine's Build Volume Available On The Debug Machine Either By Mounting It Locally (e.g., Z:\) Or By Crafting A UNC Path To It (e.g., \\builder\src) Open Up A Command Prompt And Change To A Local Disk Run Src\tools\win\copy-installer.bat In The Remote Checkout By Way Of The Mount (e.g., Z:\PATHTOCHECKOUT\src\...) Or UNC Path (e.g., \\builder\src\...). This Will Copy The Installer, DLLs, And PDBs Into Your Debug Machine's C:\out Or C:\build (depending On If You're Rocking The Component=shared_library Build Or Not) Run C:\out\Debug\mini_installer.exe With The Flags Of Your Choice To Install Chrome. This Can Take Some Time, Especially On A Slow Machine. Watch The Task Manager And Wait Until Mini_installer.exe Exits Before Trying To Launch Chrome (by Way Of The Shortcut(s) Created By The Installer) For Extra Pleasure, Add C:\out\Debug To Your _NT_SYMBOL_PATH Environment Variable Consider Reading The Documentation At The Top Of Copy-installer.bat To See How You Can Run It. It Tries To Be Smart And Copy The Right Things, But You May Need To Be Explicit (e.g., "copy-installer.bat Out Debug"). It Is Safe To Re-run The Script To Copy Only Modified Files (after A Rebuild, For Example). You Can Also Use The Zip Action Of The Isolate Scripts (tools\mb\mb.py) To Package All The Files For A Target Into A Single Zip File, For Example: Python Tools\mb\mb.py Zip Out/Release Base_unittests Base_unittests.zip Finding All Memory Allocations It Is Possible To Use Heap Snapshots To Get Call Stacks On All Outstanding Allocations That Use The OS Heap. This Works Particularly Well If Heap Snapshots Are Started As Soon As The Chrome Browser Process Is Created, But Before It Starts Running. Details Can Be Found In This Batch File. However, With PartitionAlloc Everywhere Most Chromium Allocations No Longer Use The Windows Heap So This Will Only Find A Subset Of Allocations, Mostly From OS DLLs. Find Memory Leaks Note: As With Heap Snapshots The Utility Of UMDH Is Greatly Reduced Now Because PartitionAlloc Everywhere Has Mostly Replaced The Windows Heap. The Windows Heap Manager Has A Really Useful Debug Flag, Where It Can Be Asked To Capture And Store A Stack Trace With Every Allocation. The Tool To Scrape These Stack Traces Out Of Processes Is UMDH, Which Comes With WinDbg. UMDH Is Great. It Will Capture A Snapshot Of The Heap State As Many Times As You Like, And It'll Do It Fairly Quickly. You Then Run It Again Against Either A Single Snapshot, Or A Pair Of Snapshots, At Which Time It'll Symbolize The Stack Traces And Aggregate Usage Up To Unique Stack Traces. Turning On The User Stack Trace Database For Chrome.exe With Gflags.exe Makes It Run Unbearably Slowly; However, Turning On The User Stack Trace Database On For The Browser Alone Is Just Fine. While It's Possible To Turn On The User Stack Database With The "!gflag" Debugging Extension, It's Too Late To Do This By The Time The Initial Debugger Breakpoint Hits. The Only Reasonable Way To Do This Is To Launch GFlags.exe, Enable The User Stack Trace Database (per Image Below), Launch Chrome Under The Debugger. Set A Breakpont When Chrome.dll Loads With "sxe Ld Chrome.dll". Step Up, To Allow Chrome.dll To Initialize. Disable The Stack Trace Database In GFlags.exe. Continue Chrome, Optionally Detaching The Debugger. Image GFlags.exe Settings For User Mode Stack Trace Database. If You Then Ever Suffer A Browser Memory Leak, You Can Snarf A Dump Of The Process With Umdh -p: > Chrome-browser-leak-umdh-dump.txt Which Can Then Typically Be "trivially" Analyzed To Find The Culprit. Miscellaneous Note That By Default Application Verifier Only Works With Non-official Builds Of Chromium. To Use Application Verifier On Official Builds You Need To Add --disable-features=RendererCodeIntegrity To Avoid Sandbox Crashes In Renderer Processes. See Crbug.com/1004989 For Details. See Also This Page. Application Verifier Is A Free Tool From Microsoft (available As Part Of The Windows SDK) That Can Be Used To Flush Out Programming Errors. Starting With M68 Application Verifier Can Be Enabled For Chrome.exe Without Needing To Disable The Sandbox. After Adding Chrome.exe To The List Of Applications To Be Stressed You Need To Expand The List Of Basics Checks And Disable The Leak Checks. You May Also Need To Disable Handles And Locks Checks Depending On Your Graphics Driver And Specific Chrome Version, But The Eventual Goal Is To Have Chrome Run With Handles And Locks Checks Enabled. When Bugs Are Found Chrome Will Trigger A Breakpoint So Running All Chrome Processes Under A Debugger Is Recommended. Chrome Will Run Much More Slowly Because Application Verifier Puts Every Heap Allocation On A Separate Page. Note That With PartitionAlloc Everywhere Most Chromium Allocations Don't Actually Go Through The Windows Heap And Are Therefore Unaffected By Application Verifier. You Can Check The Undocumented 'Cuzz' Checkbox In Application Verifier To Get The Windows Thread Scheduler To Add Some Extra Randomness In Order To Help Expose Race Conditions In Your Code. To Put A Breakpoint On CreateFile(), Add This Break Point: {,,kernel32.dll}_CreateFileW@28 {,,kernel32.dll} Specifies The DLL (context Operator). _ Prefix Means Extern "C". @28 Postfix Means _stdcall With The Stack Pop At The End Of The Function. I.e. The Number Of Arguments In BYTES. You Can Use DebugView From SysInternals Or Sawbuck To View LOG() Messages That Normally Go To Stderr On POSIX.” Subjects and Themes:
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Find The Chromium Logo The Chromium Projects Home Chromium ChromiumOS Quick Links Report Bugs Discuss Other Sites Chromium Blog Google Chrome Extensions Except As Otherwise Noted, The Content Of This Page Is Licensed Under A Creative Commons Attribution 2.5 License, And Examples Are Licensed Under The BSD License. Privacy Edit This Page For Developers > How-Tos > Debugging Chromium On Windows First See Get The Code For Checkout And Build Instructions. Getting Started You Can Use Visual Studio's Built-in Debugger Or WinDBG To Debug Chromium. You Don't Need To Use The IDE To Build In Order To Use The Debugger: Autoninja Is Used To Build Chromium And Most Developers Invoke It From A Command Prompt, And Then Open The IDE For Debugging As Necessary. To Start Debugging An Already-built Executable With Visual Studio Just Launch Visual Studio (2019 Or Higher) And Select File-> Open-> Project/Solution (Ctrl+Shift+O) And Select The Executable Of Interest. This Will Create A Solution With That Executable As The 'project'. You Can Then Launch The Debugger With F5 Or F11 Or From The Debug Menu. If You Right-click On The Executable In Solution Explorer And Select Properties Then You Can Edit Things Such As The Executable Path, Command-line Arguments, And Working Directory. You Can Add Additional Executables To The Solution By Using File-> Add-> Existing Project And Selecting Another Already-built Executable. You Can Select Which One To Debug By Right-clicking On One Of Them In Solution Explorer And Selecting Set As Startup Project. When Your Solution File Is Customized To Your Taste You Can Save It To A Directory Such As Out\solutions. Saving It There Helps Ensure That Relative Paths To Source Files, Printed From Build Commands, Will Correctly Identify The Source Files. The Tools Menu Can Be Used To Add Commands To Do Things Like Invoke Autoninja To Build Chrome, Compile The Selected Source File, Or Other Things. Visual Studio 2017 Is Not Recommended For Debugging Of Chromium - Use A Newer Version For Best Performance And Stability. Symbol_level=2 Is The Default On Windows And Gives Full Debugging Information With Types, Locals, Globals, Function Names, And Source/line Information. Symbol_level=1 Creates Smaller PDBs With Just Function Names, And Source/line Information - Source-level Debugging Is Still Supported (new From June 2019), But Local Variables And Type Information Are Missing. Symbol_level=0 Gives Extremely Limited Debugging Abilities, Mostly Just Viewing Call Stacks When Chromium Crashes. Browsing Source Code If You Use A Solution File Generated By Gn (gn Gen --ide=vs) Then Intellisense May Help You Navigate The Code. If This Doesn't Work Or If You Use A Solution Created As Above Then You May Want To Install VsChromium To Help Navigate The Code, As Well As Using Https://source.chromium.org. Profiles It's A Good Idea To Use A Different Chrome Profile For Your Debugging. If You Are Debugging Google Chrome Branded Builds, Or Use A Chromium Build As Your Primary Browser, The Profiles Can Collide So You Can't Run Both At Once, And Your Stable Browser Might See Profile Versions From The Future (Google Chrome And Chromium Use Different Profile Directories By Default So Won't Collide). Use The Command-line Option: --user-data-dir=C:\tmp\my_debug_profile (replace The Path As Necessary) Using The IDE, Go To The Debugging Tab Of The Properties Of The Chrome Project, And Set The Command Arguments. Chrome Debug Log Enable Chrome Debug Logging To A File By Passing --enable-logging --v=1 Command-line Flags At Startup. Debug Builds Place The Chrome_debug.log File In The Out\Debug Directory. Release Builds Place The File In The Top Level Of The User Data Chromium App Directory, Which Is OS-version-dependent. For More Information, See Logging And User Data Directory Details. Symbol Server If You Are Debugging Official Google Chrome Release Builds, Use The Symbol Server: Https://chromium-browser-symsrv.commondatastorage.googleapis.com In Visual Studio, This Goes In Tools > Options Under Debugging > Symbols. You Should Set Up A Local Cache In A Empty Directory On Your Computer. In Windbg You Can Add This To Your Symbol Server Search Path With The Command Below, Where C:\symbols Is A Local Cache Directory: .sympath+ SRV\*C:\symbols\*https://chromium-browser-symsrv.commondatastorage.googleapis.com Alternately, You Can Set The _NT_SYMBOL_PATH Environment Variable To Include Both The Microsoft And Google Symbol Servers - VS, Windbg, And Other Tools Should Both Respect This Environment Variable: _NT_SYMBOL_PATH=SRV\*C:\symbols\*https://msdl.microsoft.com/download/symbols;SRV\*C:\symbols\*https://chromium-browser-symsrv.commondatastorage.googleapis.com Note That Symbol Servers Will Let The Debuggers Download Both The PE Files (DLLs And EXEs) And The PDB Files. Chrome Often Loads Third Party Libraries And Partial Symbols For Some Of These Are Also Public. For Example: AMD: Https://download.amd.com/dir/bin Nvidia: Https://driver-symbols.nvidia.com/ Intel: Https://software.intel.com/sites/downloads/symbols/ For Example, For Completeness, The Following Symbol Server Environment Variable Will Resolve All Of The Above Sources - But This Is More Than Is Normally Needed: _NT_SYMBOL_PATH=SRV\*C:\symbols\*https://msdl.microsoft.com/download/symbols;SRV\*C:\symbols\*https://chromium-browser-symsrv.commondatastorage.googleapis.com;SRV\*C:\symbols\*https://download.amd.com/dir/bin;SRV\*C:\symbols\*https://driver-symbols.nvidia.com/;SRV\*C:\symbols\*https://software.intel.com/sites/downloads/symbols/ Source Indexing You Should Set Up Source Indexing In Your Debugger (.srcfix In Windbg, Tools-> Options-> Debugging-> General-> Enable Source Server Support In Visual Studio) So That The Correct Source Files Will Automatically Be Downloaded Based On Information In The Downloaded Symbols. Additionally, You Must Have Python In Your Path In Order For The Command That Fetches Source Files To Succeed; Launching The Debugger From The Same Environment As Where You Build Chromium Is An Easy Way To Ensure It's Present. This Is Highly Recommended When Debugging Released Google Chrome Builds Or Looking At Crash Dumps. Having The Correct Version Of The Source Files Automatically Show Up Saves Significant Time So You Should Definitely Set This. Multi-process Issues Chromium Can Be Challenging To Debug Because Of Its Multi-process Architecture. When You Select Run In The Debugger, Only The Main Browser Process Will Be Debugged. The Code That Actually Renders Web Pages (the Renderer) And The Plugins Will Be In Separate Processes That's Not (yet!) Being Debugged. The ProcessExplorer Tool Has A Process Tree View Where You Can See How These Processes Are Related. You Can Also Get The Process IDs Associated With Each Tab From The Chrome Task Manager (right-click On An Empty Area Of The Window Title Bar To Open). Automatically Attach To Child Processes There Are Two Visual Studio Extensions That Enable The Debugger To Automatically Attach To All Chrome Processes, So You Can Debug All Of Chrome At Once. Microsoft's Child Process Debugging Power Tool Is A Standalone Extension For This, And VsChromium Is Another Option That Bundles Many Other Additional Features. In Addition To Installing One Of These Extensions, You Must Run Visual Studio As Administrator, Or It Will Silently Fail To Attach To Some Of Chrome's Child Processes. Single-process Mode One Way To Debug Issues Is To Run Chromium In Single-process Mode. This Will Allow You To See The Entire State Of The Program Without Extra Work (although It Will Still Have Many Threads). To Use Single-process Mode, Add The Command-line Flag --single-process This Approach Isn't Perfect Because Some Problems Won't Manifest Themselves In This Mode And Some Features Don't Work And Worker Threads Are Still Spawned Into New Processes. Manually Attaching To A Child Process You Can Attach To The Running Child Processes With The Debugger. Select Tools > Attach To Process And Click The Chrome.exe Process You Want To Attach To. Before Attaching, Make Sure You Have Selected Only Native Code When Attaching To The Process This Is Done By Clicking Select... In The Attach To Process Window And Only Checking Native. If You Forget This, It May Attempt To Attach In "WebKit" Mode To Debug JavaScript, And You'll Get An Error Message "An Operation Is Not Legal In The Current State." You Can Now Debug The Two Processes As If They Were One. When You Are Debugging Multiple Processes, Open The Debug > Windows > Processes Window To Switch Between Them. Sometimes You Are Debugging Something That Only Happens On Startup, And Want To See The Child Process As Soon As It Starts. Use: --renderer-startup-dialog --no-sandbox You Have To Disable The Sandbox Or The Dialog Box Will Be Prohibited From Showing. When The Dialog Appears, Visit Tools > Attach To Process And Attach To The Process Showing The Renderer Startup Dialog. Now You're Debugging In The Renderer And Can Continue Execution By Pressing OK In The Dialog. Startup Dialogs Also Exist For Other Child Process Types: --gpu-startup-dialog, --ppapi-startup-dialog, --utility-startup-dialog, --plugin-startup-dialog (for NPAPI). For Utilities, You Can Add A Service Type --utility-startup-dialog=data_decoder.mojom.DataDecoderService. You Can Also Try The Vs-chromium Plug-in To Attach To The Right Processes. Semi-automatically Attaching The Debugger To Child Processes The Following Flags Cause Child Processes To Wait For 60 Seconds In A Busy Loop For A Debugger To Attach To The Process. Once Either Condition Is True, It Continues On; No Exception Is Thrown. --wait-for-debugger-children[=filter] The Filter, If Provided, Will Fire Only If It Matches The --type Parameter To The Process. Values Include Renderer, Plugin (for NPAPI), Ppapi, Gpu-process, And Utility. When Using This Option, It May Be Helpful To Limit The Number Of Renderer Processes Spawned, Using: --renderer-process-limit=1 Image File Execution Options Using Image File Execution Options (IFEO) Will Not Work Because CreateProcess() Returns The Handle To The Debugger Process Instead Of The Intended Child Process. There Are Also Issues With The Sandbox. Time Travel Debugging You Can Do Time Travel Debugging Using WinDbg Preview (must Be Installed From The Microsoft Store). This Lets You Execute A Program Forward And Backwards. After Capturing A Trace, You Can Set Breakpoints And Step Through Code As Normal, But Also Provides 'backwards' Commands (g-, T-, P-) So That You Can Go Back And Forth Through The Execution. It Is Especially Useful To Set Data Breakpoints (ba Command) And Reverse Continuing, So You Can See When A Certain Variable Was Last Changed To Its Current Value. Chromium Specifics: The Type Of Injection The Time Travel Tracer Needs To Perform Is Incompatible With The Chromium Sandbox. In Order To Record A Trace, You'll Need To Run With --no-sandbox. Chromium Cannot Run Elevated With Administrator Privileges, So The "Launch Executable (advance)" Option Won't Work, You'll Need To Attach After The Process Has Already Launched Via The Checkbox In The Bottom Right. If You Need To Record Startup-like Things, You'll Have To Use --{browser,gpu,renderer,utility}-startup-dialog, Then Attach (and Hope The Relevant Code Hasn't Executed Before That Point). JsDbg -- Data Structure Visualization You Can Install JsDbg As A Plugin For WinDbg Or Visual Studio. It Interactively Lets You Look At Data Structures (such As The DOM Tree, Accessibility Tree, Layout Object Tree, And Others) In A Web Browser As You Debug. See The JsDbg Site For Some Screen Shots And Usage Examples. This Also Works When Examining Memory Dumps (though Not Minidumps), And Also Works Together With Time Travel Debugging. Visual Studio Hints Debug Visualizers Chrome's Custom Debug Visualizers Should Be Added To The Pdb Files And Automatically Picked Up By Visual Studio. The Definitions Are In //tools/win/DebugVisualizers If You Need To Modify Them (the BUILD.gn File There Has Additional Instructions). Don't Step Into Trivial Functions The Debugger Can Be Configured To Automatically Not Step Into Functions Based On Regular Expression. Edit Default.natstepfilter In The Following Directory: For Visual Studio 2015: C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\Packages\Debugger\Visualizers (for All Users) Or %USERPROFILE%\My Documents\Visual Studio 2015\Visualizers (for The Current User Only) For Visual Studio 2017 Pro: C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\Common7\Packages\Debugger\Visualizers (for All Users) Or %USERPROFILE%\My Documents\Visual Studio 2017\Visualizers (for The Current User Only) Add Regular Expressions Of Functions To Not Step Into. Remember To Regex-escape And XML-escape Them, E.g. < For < And \. For A Literal Dot. Example: Operator New NoStepInto Operator Delete NoStepInto Std::.* NoStepInto WTF::.*Ptr ::.* NoStepInto This File Is Read At Start Of A Debugging Session (F5), So You Don't Need To Restart Visual Studio After Changing It. More Info: Microsoft Email Thread V8 And Chromium V8 Supports Many Command-line Flags That Are Useful For Debugging. V8 Command-line Flags Can Be Set Via The Chromium Command-line Flag --js-flags; For Instance: Chrome.exe --js-flags="--trace_exception --heap_stats" Note That Some V8 Command-line Flags Exist Only In The Debug Build Of V8. For A List Of All V8 Flags Try: Chrome.exe --js-flags="--help" Graphics Debugging GPU Acceleration Of Rendering Can Be More Easily Debugged With Tools. See: Graphics Debugging In Visual Studio 2013 Graphical Debugging With NVIDIA NSight Debugging On Another Machine Sometimes It's Useful To Debug Installation And Execution On A Machine Other Than Your Primary Build Box. To Run The Installer On Said Other Machine, First Build The Mini_installer Target On Your Main Build Machine (e.g., Autoninja -C Out\Debug Mini_installer). Next, On The Debug Machine: Make The Build Machine's Build Volume Available On The Debug Machine Either By Mounting It Locally (e.g., Z:\) Or By Crafting A UNC Path To It (e.g., \\builder\src) Open Up A Command Prompt And Change To A Local Disk Run Src\tools\win\copy-installer.bat In The Remote Checkout By Way Of The Mount (e.g., Z:\PATHTOCHECKOUT\src\...) Or UNC Path (e.g., \\builder\src\...). This Will Copy The Installer, DLLs, And PDBs Into Your Debug Machine's C:\out Or C:\build (depending On If You're Rocking The Component=shared_library Build Or Not) Run C:\out\Debug\mini_installer.exe With The Flags Of Your Choice To Install Chrome. This Can Take Some Time, Especially On A Slow Machine. Watch The Task Manager And Wait Until Mini_installer.exe Exits Before Trying To Launch Chrome (by Way Of The Shortcut(s) Created By The Installer) For Extra Pleasure, Add C:\out\Debug To Your _NT_SYMBOL_PATH Environment Variable Consider Reading The Documentation At The Top Of Copy-installer.bat To See How You Can Run It. It Tries To Be Smart And Copy The Right Things, But You May Need To Be Explicit (e.g., "copy-installer.bat Out Debug"). It Is Safe To Re-run The Script To Copy Only Modified Files (after A Rebuild, For Example). You Can Also Use The Zip Action Of The Isolate Scripts (tools\mb\mb.py) To Package All The Files For A Target Into A Single Zip File, For Example: Python Tools\mb\mb.py Zip Out/Release Base_unittests Base_unittests.zip Finding All Memory Allocations It Is Possible To Use Heap Snapshots To Get Call Stacks On All Outstanding Allocations That Use The OS Heap. This Works Particularly Well If Heap Snapshots Are Started As Soon As The Chrome Browser Process Is Created, But Before It Starts Running. Details Can Be Found In This Batch File. However, With PartitionAlloc Everywhere Most Chromium Allocations No Longer Use The Windows Heap So This Will Only Find A Subset Of Allocations, Mostly From OS DLLs. Find Memory Leaks Note: As With Heap Snapshots The Utility Of UMDH Is Greatly Reduced Now Because PartitionAlloc Everywhere Has Mostly Replaced The Windows Heap. The Windows Heap Manager Has A Really Useful Debug Flag, Where It Can Be Asked To Capture And Store A Stack Trace With Every Allocation. The Tool To Scrape These Stack Traces Out Of Processes Is UMDH, Which Comes With WinDbg. UMDH Is Great. It Will Capture A Snapshot Of The Heap State As Many Times As You Like, And It'll Do It Fairly Quickly. You Then Run It Again Against Either A Single Snapshot, Or A Pair Of Snapshots, At Which Time It'll Symbolize The Stack Traces And Aggregate Usage Up To Unique Stack Traces. Turning On The User Stack Trace Database For Chrome.exe With Gflags.exe Makes It Run Unbearably Slowly; However, Turning On The User Stack Trace Database On For The Browser Alone Is Just Fine. While It's Possible To Turn On The User Stack Database With The "!gflag" Debugging Extension, It's Too Late To Do This By The Time The Initial Debugger Breakpoint Hits. The Only Reasonable Way To Do This Is To Launch GFlags.exe, Enable The User Stack Trace Database (per Image Below), Launch Chrome Under The Debugger. Set A Breakpont When Chrome.dll Loads With "sxe Ld Chrome.dll". Step Up, To Allow Chrome.dll To Initialize. Disable The Stack Trace Database In GFlags.exe. Continue Chrome, Optionally Detaching The Debugger. Image GFlags.exe Settings For User Mode Stack Trace Database. If You Then Ever Suffer A Browser Memory Leak, You Can Snarf A Dump Of The Process With Umdh -p: > Chrome-browser-leak-umdh-dump.txt Which Can Then Typically Be "trivially" Analyzed To Find The Culprit. Miscellaneous Note That By Default Application Verifier Only Works With Non-official Builds Of Chromium. To Use Application Verifier On Official Builds You Need To Add --disable-features=RendererCodeIntegrity To Avoid Sandbox Crashes In Renderer Processes. See Crbug.com/1004989 For Details. See Also This Page. Application Verifier Is A Free Tool From Microsoft (available As Part Of The Windows SDK) That Can Be Used To Flush Out Programming Errors. Starting With M68 Application Verifier Can Be Enabled For Chrome.exe Without Needing To Disable The Sandbox. After Adding Chrome.exe To The List Of Applications To Be Stressed You Need To Expand The List Of Basics Checks And Disable The Leak Checks. You May Also Need To Disable Handles And Locks Checks Depending On Your Graphics Driver And Specific Chrome Version, But The Eventual Goal Is To Have Chrome Run With Handles And Locks Checks Enabled. When Bugs Are Found Chrome Will Trigger A Breakpoint So Running All Chrome Processes Under A Debugger Is Recommended. Chrome Will Run Much More Slowly Because Application Verifier Puts Every Heap Allocation On A Separate Page. Note That With PartitionAlloc Everywhere Most Chromium Allocations Don't Actually Go Through The Windows Heap And Are Therefore Unaffected By Application Verifier. You Can Check The Undocumented 'Cuzz' Checkbox In Application Verifier To Get The Windows Thread Scheduler To Add Some Extra Randomness In Order To Help Expose Race Conditions In Your Code. To Put A Breakpoint On CreateFile(), Add This Break Point: {,,kernel32.dll}_CreateFileW@28 {,,kernel32.dll} Specifies The DLL (context Operator). _ Prefix Means Extern "C". @28 Postfix Means _stdcall With The Stack Pop At The End Of The Function. I.e. The Number Of Arguments In BYTES. You Can Use DebugView From SysInternals Or Sawbuck To View LOG() Messages That Normally Go To Stderr On POSIX. at online marketplaces:
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19Laura Pugh On SEN's The Run Home - 6 October
By Fremantle Dockers Football Club
The Fremantle defender joined Paul Hasleby and Damian Martin on SEN WA ahead of a big clash with Adelaide on Saturday.See omnystudio.com/listener for privacy information.
“Laura Pugh On SEN's The Run Home - 6 October” Metadata:
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- Author: ➤ Fremantle Dockers Football Club
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20Run Your Home On A Raspberry Pi (The Changelog #489)
By Changelog Master Feed
This week we're joined by Mike Riley and we're talking about his book Portable Python Projects (Running your home on a Raspberry Pi). We breakdown the details of the latest Raspberry Pi hardware, various automation ideas from the book, why Mike prefers Python for scripting on a Raspberry Pi, and of course why the Raspberry Pi makes sense for home labs concerned about data security. Use the code PYPROJECTS to get a 35% discount on the book. That code is valid for approximately 60 days after the episode's publish date.
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- Title: ➤ Run Your Home On A Raspberry Pi (The Changelog #489)
- Author: Changelog Master Feed
“Run Your Home On A Raspberry Pi (The Changelog #489)” Subjects and Themes:
- Subjects: ➤ Podcast - changelog - open source - oss - software - development - developer - hackerchangelog - code - programming - hacker - change log - software engineering
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21Voices Of La PazS.96 2nd Annual Home Run Derby
By AWC TV
Parker Police Chief Clay Romo is in the Studio this Week to Promote The 2nd Annual Home Run Derby on November 1st. He also Shares with us some Information on the NEW Medication Disposal Drop Box Located at the Parker Police Department Office -AWC Links- AWC Website: www.AzWestern.Edu AWC Email: [email protected] Facebook Links: https://www.facebook.com/AWCParker - AWC Parker Learning Center https://www.facebook.com/LaPazTvServices - AWC TV Services
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- Author: AWC TV
- Language: English
“Voices Of La PazS.96 2nd Annual Home Run Derby” Subjects and Themes:
- Subjects: ➤ Arizona - Yuma - Arizona Western College TV - AWC TV - Educational Access TV - Community Media - PEG - Youtube - Western - College - AWC - Homerun - Derby - Annual - Parker PD - Baseball (Interest) - Voices of La Paz - 2014
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22080: Home Run Inn
By Unrelenting
On this Unrelenting episode we bring you the brand of scintillating conversation that Unrelenting has become infamous for. Thanks for listening. Subscribe and tell a friend! EXECUTIVE PRODUCERS:Clip CustodianNetNedNAMillennialCbrooklyn112CSB - https://CSB.lolTHANK YOU! JOIN GENE'S VIDEOGAME / CULT: https://bit.ly/3yrF9uEBUY GENE'S SPACESHIPS: https://star-hangar.com/shop/Origin-Used-VehiclesGENE'S PONCHO ON AMAZON: https://amazon.com/gp/product/B0BN6ZR75B CHECK OUT THESE OTHER SHOWS: SIR GENE SPEAKS: https://podcast.sirgene.com/JUST TWO GOOD ... Continue reading "080: Home Run Inn"
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- Author: Unrelenting
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23The Walking Dead Podcast Episode 1006, "Bonds" Like The Home Run Guy
By The Walking Dead Podcast: Baltic Effect
No Description
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- Title: ➤ The Walking Dead Podcast Episode 1006, "Bonds" Like The Home Run Guy
- Author: ➤ The Walking Dead Podcast: Baltic Effect
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24Reds' Todd Frazier Wins Home Run Derby In Home Park
By John Gregory
Frazier did make it interesting, needing some extra time to eek out a win over L-A Dodgers rookie Joc Pederson If competing in the Home Run Derby in front of his hometown fans packed on any pressure, Cincinnati Reds third baseman Todd Frazier sure didn't show it. He seemed to feed off the friendly crowd on his way to winning the 2015 derby... CUT . By hitting two homers longer than 425 feet, he earned some extra seconds, and set a new Home Run Derby record by hitting 15 longballs in the final round. The longest home run of the night was hit by Pederson---one of his homers went 487 feet---which if this had been a real game, would've been the fifth longest home run ever at the Great American Ballpark.
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- Title: ➤ Reds' Todd Frazier Wins Home Run Derby In Home Park
- Author: John Gregory
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- Internet Archive ID: A63_20150714042339276
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25On This Date - Babe Ruth Hits First Career Home Run
By BronxNet
"On This Date" in Bronx sports history - May 6th, 1915, Babe Ruth hit the first of his record-setting 714 home runs. As a member of the Boston Red Sox, “The Great Bambino” reached the seats against the New York Yankees, his future team. Ruth would go on to be arguably the greatest player in Major League history.
“On This Date - Babe Ruth Hits First Career Home Run” Metadata:
- Title: ➤ On This Date - Babe Ruth Hits First Career Home Run
- Author: BronxNet
- Language: English
“On This Date - Babe Ruth Hits First Career Home Run” Subjects and Themes:
- Subjects: ➤ New York - The Bronx - BronxNet - Public Access TV - Community Media - PEG - Youtube - Sports - Bronxnet - NYC Sports - 2022
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- Internet Archive ID: ➤ bronxny-On_this_Date_-_Babe_Ruth_hits_first_career_home_run
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26On The Distribution Of Career Longevity And The Evolution Of Home Run Prowess In Professional Baseball
By Alexander Petersen, Woo-Sung Jung and H. Eugene Stanley
Statistical analysis is a major aspect of baseball, from player averages to historical benchmarks and records. Much of baseball fanfare is based around players exceeding the norm, some in a single game and others over a long career. Career statistics serve as a metric for classifying players and establishing their historical legacy. However, the concept of records and benchmarks assumes that the level of competition in baseball is stationary in time. Here we show that power-law probability density functions, a hallmark of many complex systems that are driven by competition, govern career longevity in baseball. We also find similar power laws in the density functions of all major performance metrics for pitchers and batters. The use of performance-enhancing drugs has a dark history, emerging as a problem for both amateur and professional sports. We find statistical evidence consistent with performance-enhancing drugs in the analysis of home runs hit by players in the last 25 years. This is corroborated by the findings of the Mitchell Report [1], a two-year investigation into the use of illegal steroids in major league baseball, which recently revealed that over 5 percent of major league baseball players tested positive for performance-enhancing drugs in an anonymous 2003 survey.
“On The Distribution Of Career Longevity And The Evolution Of Home Run Prowess In Professional Baseball” Metadata:
- Title: ➤ On The Distribution Of Career Longevity And The Evolution Of Home Run Prowess In Professional Baseball
- Authors: Alexander PetersenWoo-Sung JungH. Eugene Stanley
Edition Identifiers:
- Internet Archive ID: arxiv-0804.0061
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27We Run Because We Must Not Stop. On The Morning Of October 7, @hagit_yaso Went For A Run. She Had No Idea How Lucky She’d Be To Survive That Day. After Being Forced To Leave Her Home In Sderot And Live Out Of A Hotel, Hagit Met YaeliGoodman — Founder Of @runjlm. Together, The Two Women Helped Each Other And Other Survivors Of October 7 Heal From Their Trauma Through The Therapeutic Power Of Running. Here Is Their Story. Via @aipac
By israelinusa
We run because we must not stop. On the morning of October 7, @hagit_yaso went for a run. She had no idea how lucky she’d be to survive that day. After being forced to leave her home in Sderot and live out of a hotel, Hagit met YaeliGoodman — founder of @runjlm. Together, the two women helped each other and other survivors of October 7 heal from their trauma through the therapeutic power of running. Here is their story. Via @aipac
“We Run Because We Must Not Stop. On The Morning Of October 7, @hagit_yaso Went For A Run. She Had No Idea How Lucky She’d Be To Survive That Day. After Being Forced To Leave Her Home In Sderot And Live Out Of A Hotel, Hagit Met YaeliGoodman — Founder Of @runjlm. Together, The Two Women Helped Each Other And Other Survivors Of October 7 Heal From Their Trauma Through The Therapeutic Power Of Running. Here Is Their Story. Via @aipac” Metadata:
- Title: ➤ We Run Because We Must Not Stop. On The Morning Of October 7, @hagit_yaso Went For A Run. She Had No Idea How Lucky She’d Be To Survive That Day. After Being Forced To Leave Her Home In Sderot And Live Out Of A Hotel, Hagit Met YaeliGoodman — Founder Of @runjlm. Together, The Two Women Helped Each Other And Other Survivors Of October 7 Heal From Their Trauma Through The Therapeutic Power Of Running. Here Is Their Story. Via @aipac
- Author: israelinusa
“We Run Because We Must Not Stop. On The Morning Of October 7, @hagit_yaso Went For A Run. She Had No Idea How Lucky She’d Be To Survive That Day. After Being Forced To Leave Her Home In Sderot And Live Out Of A Hotel, Hagit Met YaeliGoodman — Founder Of @runjlm. Together, The Two Women Helped Each Other And Other Survivors Of October 7 Heal From Their Trauma Through The Therapeutic Power Of Running. Here Is Their Story. Via @aipac” Subjects and Themes:
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- Internet Archive ID: TikTok-7481717347267382558
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28Run Home
By bobsmiles
a vid by me for railworks
“Run Home” Metadata:
- Title: Run Home
- Author: bobsmiles
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- Subjects: acidplanet - archiveteam
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- Internet Archive ID: acidplanet-audio-01239941
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29Home Run Playthrough
By MooseTheHuman
It's a long walk back to home.
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- Title: Home Run Playthrough
- Author: MooseTheHuman
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- Internet Archive ID: home-run
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30NL Quick Look: Brewers Challenge Strange Home Run Call
By John Gregory
Umpires rule player didn't touch home, then reverse call A home run gets taken away--and then given right back. Here's a quick look at action from around the National League. Milwaukee Brewers outfielder Khris Davis hit one out of the park in Brewers' 8-4 loss to the San Francisco Giants. Even when you hit a homer, you still have to touch home plate for the run to count---and the umpires ruled Davis skipped over the plate, and called him out. The Brewers challenged the call and won, so the home run counted. The St. Louis Cardinals needed a 10th inning solo homer from shortstop Jhonny Peralta to beat the Arizona Diamondbacks 3-2. It's the 4th game-winning homer of Peralta's career. New York Mets pitcher Bartolo Colon may have turned 42 this week, but he can still win games. He earned the W in the Mets' 6-3 victory over the Philadelphia Phillies, improving Colon's record to 7-3 on the season. The league's longest active losing streak belongs to the Cincinnati Reds. Their 5-4 loss to the Colorado Rockies is their 9th straight defeat--the longest in franchise history since 1998.
“NL Quick Look: Brewers Challenge Strange Home Run Call” Metadata:
- Title: ➤ NL Quick Look: Brewers Challenge Strange Home Run Call
- Author: John Gregory
Edition Identifiers:
- Internet Archive ID: A63_20150526032946158
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31Zi Run Jia Xiang Tian Pin =: Home-town Desserts From Around China
By Shaopeng Du
Umpires rule player didn't touch home, then reverse call A home run gets taken away--and then given right back. Here's a quick look at action from around the National League. Milwaukee Brewers outfielder Khris Davis hit one out of the park in Brewers' 8-4 loss to the San Francisco Giants. Even when you hit a homer, you still have to touch home plate for the run to count---and the umpires ruled Davis skipped over the plate, and called him out. The Brewers challenged the call and won, so the home run counted. The St. Louis Cardinals needed a 10th inning solo homer from shortstop Jhonny Peralta to beat the Arizona Diamondbacks 3-2. It's the 4th game-winning homer of Peralta's career. New York Mets pitcher Bartolo Colon may have turned 42 this week, but he can still win games. He earned the W in the Mets' 6-3 victory over the Philadelphia Phillies, improving Colon's record to 7-3 on the season. The league's longest active losing streak belongs to the Cincinnati Reds. Their 5-4 loss to the Colorado Rockies is their 9th straight defeat--the longest in franchise history since 1998.
“Zi Run Jia Xiang Tian Pin =: Home-town Desserts From Around China” Metadata:
- Title: ➤ Zi Run Jia Xiang Tian Pin =: Home-town Desserts From Around China
- Author: Shaopeng Du
- Language: chi
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- Internet Archive ID: zirunjiaxiangtia0000shao
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32Return Of The Home Run Kid
By Christopher, Matt, 1917-1997 and Casale, Paul, illustrator
Sylvester Coddmyer III is having a dismal baseball season until he takes advice from a mysterious ex-ballplayer named Cheeko and starts to play more aggressively
“Return Of The Home Run Kid” Metadata:
- Title: Return Of The Home Run Kid
- Authors: Christopher, Matt, 1917-1997Casale, Paul, illustrator
- Language: English
“Return Of The Home Run Kid” Subjects and Themes:
- Subjects: Baseball stories - Baseball
Edition Identifiers:
- Internet Archive ID: returnofhomerunk00matt
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33Hank Aaron Breaks Babe Ruth's Home Run Record
By Jack Schmerer
Listen to the story on Rivet
“Hank Aaron Breaks Babe Ruth's Home Run Record” Metadata:
- Title: ➤ Hank Aaron Breaks Babe Ruth's Home Run Record
- Author: Jack Schmerer
Edition Identifiers:
- Internet Archive ID: A63_20150331155033418
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34Daily 3: Tax Filing Delays / Tornadoes / Home Run Record
By Rob LaFrentz
Listen to the story on Rivet
“Daily 3: Tax Filing Delays / Tornadoes / Home Run Record” Metadata:
- Title: ➤ Daily 3: Tax Filing Delays / Tornadoes / Home Run Record
- Author: Rob LaFrentz
Edition Identifiers:
- Internet Archive ID: A63_20150409111634266
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35Bob Murphy On SEN WA's The Run Home - 8 November
By Fremantle Dockers Football Club
Bob Murphy joined Paul Hasleby and Damien Martin on SEN WA to chat through Trent Cooper's departure and how he's settled in life at Freo over the past year.See omnystudio.com/listener for privacy information.
“Bob Murphy On SEN WA's The Run Home - 8 November” Metadata:
- Title: ➤ Bob Murphy On SEN WA's The Run Home - 8 November
- Author: ➤ Fremantle Dockers Football Club
Edition Identifiers:
- Internet Archive ID: ➤ x85wfcmllxx6fhhkg3qdqsjfwyrv74qsl8r5kaif
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36How To Run A Successful Business From Home And Stay Sane! : Everything You Need To Build And Grow A Profitable Business
Bob Murphy joined Paul Hasleby and Damien Martin on SEN WA to chat through Trent Cooper's departure and how he's settled in life at Freo over the past year.See omnystudio.com/listener for privacy information.
“How To Run A Successful Business From Home And Stay Sane! : Everything You Need To Build And Grow A Profitable Business” Metadata:
- Title: ➤ How To Run A Successful Business From Home And Stay Sane! : Everything You Need To Build And Grow A Profitable Business
- Language: English
“How To Run A Successful Business From Home And Stay Sane! : Everything You Need To Build And Grow A Profitable Business” Subjects and Themes:
- Subjects: Home-based businesses - New business enterprises
Edition Identifiers:
- Internet Archive ID: howtorunsuccessf0000unse
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37Start, Run, And Profit From Your Own Home-based Business
By Kishel, Gregory F., 1946-, Kishel, Patricia Gunter, 1948- and Kishel, Gregory F., 1946- Dollars on your doorstep
Bob Murphy joined Paul Hasleby and Damien Martin on SEN WA to chat through Trent Cooper's departure and how he's settled in life at Freo over the past year.See omnystudio.com/listener for privacy information.
“Start, Run, And Profit From Your Own Home-based Business” Metadata:
- Title: ➤ Start, Run, And Profit From Your Own Home-based Business
- Authors: ➤ Kishel, Gregory F., 1946-Kishel, Patricia Gunter, 1948-Kishel, Gregory F., 1946- Dollars on your doorstep
- Language: English
“Start, Run, And Profit From Your Own Home-based Business” Subjects and Themes:
- Subjects: Home-based businesses - New business enterprises - Home employment
Edition Identifiers:
- Internet Archive ID: startrunprofitfr00kish
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38Comeback Of The Home Run Kid
By Peters, Stephanie True, 1965-
Bob Murphy joined Paul Hasleby and Damien Martin on SEN WA to chat through Trent Cooper's departure and how he's settled in life at Freo over the past year.See omnystudio.com/listener for privacy information.
“Comeback Of The Home Run Kid” Metadata:
- Title: Comeback Of The Home Run Kid
- Author: Peters, Stephanie True, 1965-
- Language: English
“Comeback Of The Home Run Kid” Subjects and Themes:
- Subjects: ➤ Baseball stories - Home runs (Baseball) -- Juvenile fiction - Baseball -- Fiction - Home runs (Baseball) - Wounds and injuries -- Fiction
Edition Identifiers:
- Internet Archive ID: comebackofhomeru0000pete
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39Lipman Pike : America's First Home Run King
By Michelson, Richard
Bob Murphy joined Paul Hasleby and Damien Martin on SEN WA to chat through Trent Cooper's departure and how he's settled in life at Freo over the past year.See omnystudio.com/listener for privacy information.
“Lipman Pike : America's First Home Run King” Metadata:
- Title: ➤ Lipman Pike : America's First Home Run King
- Author: Michelson, Richard
- Language: English
“Lipman Pike : America's First Home Run King” Subjects and Themes:
- Subjects: ➤ Pike, Lipman, 1845-1893 -- Juvenile literature - Baseball players -- United States -- Biography -- Juvenile literature - Jewish baseball players -- United States -- Biography -- Juvenile literature
Edition Identifiers:
- Internet Archive ID: lipmanpikeameric0000mich
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40Shot Down And On The Run : The RAF And Commonwealth Aircrews Who Got Home From Behind Enemy Lines, 1940-1945
By Pitchfork, Graham
Bob Murphy joined Paul Hasleby and Damien Martin on SEN WA to chat through Trent Cooper's departure and how he's settled in life at Freo over the past year.See omnystudio.com/listener for privacy information.
“Shot Down And On The Run : The RAF And Commonwealth Aircrews Who Got Home From Behind Enemy Lines, 1940-1945” Metadata:
- Title: ➤ Shot Down And On The Run : The RAF And Commonwealth Aircrews Who Got Home From Behind Enemy Lines, 1940-1945
- Author: Pitchfork, Graham
- Language: English
“Shot Down And On The Run : The RAF And Commonwealth Aircrews Who Got Home From Behind Enemy Lines, 1940-1945” Subjects and Themes:
- Subjects: ➤ Great Britain. Ml9 - World War, 1939-1945 -- Underground movements - Escapes -- History -- 20th century - Airplane crash survival - Airmen -- Commonwealth countries -- Biography - Airmen -- Canada -- Biography
Edition Identifiers:
- Internet Archive ID: shotdownonrunraf0000pitc
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41Little Bear's Feather ; And, Run For Home
By Davies, Evelyn, 1920-
Bob Murphy joined Paul Hasleby and Damien Martin on SEN WA to chat through Trent Cooper's departure and how he's settled in life at Freo over the past year.See omnystudio.com/listener for privacy information.
“Little Bear's Feather ; And, Run For Home” Metadata:
- Title: ➤ Little Bear's Feather ; And, Run For Home
- Author: Davies, Evelyn, 1920-
- Language: English
“Little Bear's Feather ; And, Run For Home” Subjects and Themes:
- Subjects: ➤ Children's stories - Children's stories in English, 1900- Texts
Edition Identifiers:
- Internet Archive ID: littlebearsfeath0000davi
Downloads Information:
The book is available for download in "texts" format, the size of the file-s is: 369.04 Mbs, the file-s for this book were downloaded 24 times, the file-s went public at Wed Mar 02 2022.
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42IUMA: Run Home Jack
In the beginning there was darkness and a big void of...darkness. Slowly things began to come out of the void...mostly space tacos and dirty underwear, but one day something new came through. Music. Beauty. I love you. Anyway, music evolved over the years into different genres. Today, music sucks. It's evolved into clicks, whistles, and repetitive rhymes, and repetitive rhymes. So...from the mess of sound a few really awful musicians decided to get better. Pumpkin Bomb was formed. Beginning as a really twisted example of a bad cover band, these few individuals began to rock. Q (guitarist and vocal hellion) began to learn to play the guitar at an alarming rate. Following the trend as he LOVES to do, Tink (trumpeteer monkey-slapper and beauty consultant) continued with his long running trumpet playing career. Coldy with the flames of badness, Justin (the reincarnation of Victor w00tan) quickly built mad crazy man scales on his flat man slappy mac bass. He rocked it hard. Continuing on, Joseph (trombone squire sultan of slide) gave up Christianity to continue his rocking hardness. Finally, and very much the important, Ben (definitely not black guitarist and harmony goddess ness) rocked us all SO hard. These fellows had been in a couple of bands, like the PUMPKIN BOMB...and Ben held down the fort of 3 Days til May. Much confusion and homosexuality ensued and the 2 bands merged to from this here Run Home Jack fella. So without anymore wanton idiocy...welcome to my nightmare.
“IUMA: Run Home Jack” Metadata:
- Title: IUMA: Run Home Jack
Edition Identifiers:
- Internet Archive ID: iuma-run_home_jack
Downloads Information:
The book is available for download in "audio" format, the size of the file-s is: 33.45 Mbs, the file-s for this book were downloaded 91 times, the file-s went public at Sun May 20 2012.
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43Run For Home
By Latus, Dan
In the beginning there was darkness and a big void of...darkness. Slowly things began to come out of the void...mostly space tacos and dirty underwear, but one day something new came through. Music. Beauty. I love you. Anyway, music evolved over the years into different genres. Today, music sucks. It's evolved into clicks, whistles, and repetitive rhymes, and repetitive rhymes. So...from the mess of sound a few really awful musicians decided to get better. Pumpkin Bomb was formed. Beginning as a really twisted example of a bad cover band, these few individuals began to rock. Q (guitarist and vocal hellion) began to learn to play the guitar at an alarming rate. Following the trend as he LOVES to do, Tink (trumpeteer monkey-slapper and beauty consultant) continued with his long running trumpet playing career. Coldy with the flames of badness, Justin (the reincarnation of Victor w00tan) quickly built mad crazy man scales on his flat man slappy mac bass. He rocked it hard. Continuing on, Joseph (trombone squire sultan of slide) gave up Christianity to continue his rocking hardness. Finally, and very much the important, Ben (definitely not black guitarist and harmony goddess ness) rocked us all SO hard. These fellows had been in a couple of bands, like the PUMPKIN BOMB...and Ben held down the fort of 3 Days til May. Much confusion and homosexuality ensued and the 2 bands merged to from this here Run Home Jack fella. So without anymore wanton idiocy...welcome to my nightmare.
“Run For Home” Metadata:
- Title: Run For Home
- Author: Latus, Dan
- Language: English
“Run For Home” Subjects and Themes:
- Subjects: ➤ Intelligence officers -- England -- Fiction - Murders -- Fiction - Intelligence officers - Prague (Czech Republic) -- Fiction - Czech Republic -- Prague - England
Edition Identifiers:
- Internet Archive ID: runforhome0000latu_e6n1
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The book is available for download in "texts" format, the size of the file-s is: 758.20 Mbs, the file-s for this book were downloaded 10 times, the file-s went public at Wed Jan 19 2022.
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44Omni Edition Garden City: 2019 Great Bacon Run - Community Coalition & Our HOME Pantry
By GCTV
In the beginning there was darkness and a big void of...darkness. Slowly things began to come out of the void...mostly space tacos and dirty underwear, but one day something new came through. Music. Beauty. I love you. Anyway, music evolved over the years into different genres. Today, music sucks. It's evolved into clicks, whistles, and repetitive rhymes, and repetitive rhymes. So...from the mess of sound a few really awful musicians decided to get better. Pumpkin Bomb was formed. Beginning as a really twisted example of a bad cover band, these few individuals began to rock. Q (guitarist and vocal hellion) began to learn to play the guitar at an alarming rate. Following the trend as he LOVES to do, Tink (trumpeteer monkey-slapper and beauty consultant) continued with his long running trumpet playing career. Coldy with the flames of badness, Justin (the reincarnation of Victor w00tan) quickly built mad crazy man scales on his flat man slappy mac bass. He rocked it hard. Continuing on, Joseph (trombone squire sultan of slide) gave up Christianity to continue his rocking hardness. Finally, and very much the important, Ben (definitely not black guitarist and harmony goddess ness) rocked us all SO hard. These fellows had been in a couple of bands, like the PUMPKIN BOMB...and Ben held down the fort of 3 Days til May. Much confusion and homosexuality ensued and the 2 bands merged to from this here Run Home Jack fella. So without anymore wanton idiocy...welcome to my nightmare.
“Omni Edition Garden City: 2019 Great Bacon Run - Community Coalition & Our HOME Pantry” Metadata:
- Title: ➤ Omni Edition Garden City: 2019 Great Bacon Run - Community Coalition & Our HOME Pantry
- Author: GCTV
- Language: English
“Omni Edition Garden City: 2019 Great Bacon Run - Community Coalition & Our HOME Pantry” Subjects and Themes:
- Subjects: ➤ Michigan - Garden City - Garden City TV - GCTV - Government Access TV - Community Media - PEG - Youtube - OETV - Omni Edition Television - City - 2019 - Omni Edition Garden City
Edition Identifiers:
- Internet Archive ID: ➤ gctvmi-Omni_Edition_Garden_City_-_2019_Great_Bacon_Run_-_Community_Coalition_Our_HOME_Pantry
Downloads Information:
The book is available for download in "movies" format, the size of the file-s is: 163.67 Mbs, the file-s for this book were downloaded 101 times, the file-s went public at Sun Jul 14 2019.
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45Adam Beard On SEN WA's The Run Home - 11 November
By Fremantle Dockers Football Club
Fremantle's Director of Football Performance and Innovation Dr. Adam Beard spoke to SEN WA's The Run Home about his return to Fremantle after a decorated career working at some of the best sporting Clubs in the world.See omnystudio.com/listener for privacy information.
“Adam Beard On SEN WA's The Run Home - 11 November” Metadata:
- Title: ➤ Adam Beard On SEN WA's The Run Home - 11 November
- Author: ➤ Fremantle Dockers Football Club
Edition Identifiers:
- Internet Archive ID: ➤ tmk5enalqu728ebefvs2osqi6eert6ovpf6cgf8s
Downloads Information:
The book is available for download in "audio" format, the size of the file-s is: 10.58 Mbs, the file-s for this book were downloaded 1 times, the file-s went public at Mon Dec 19 2022.
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46Derek Jones Sets New Home Run Mark At WSU!
By WSUCougarAthletics
Join us in congratulating Derek Jones as the new Home Run leader at WSU! GO COUGS!
“Derek Jones Sets New Home Run Mark At WSU!” Metadata:
- Title: ➤ Derek Jones Sets New Home Run Mark At WSU!
- Author: WSUCougarAthletics
“Derek Jones Sets New Home Run Mark At WSU!” Subjects and Themes:
- Subjects: ➤ Youtube - video - Sports - Washington State University - Go Cougs - Cougar Baseball - Washington State Cougars - WSU
Edition Identifiers:
- Internet Archive ID: youtube-ISr7eitqN8E
Downloads Information:
The book is available for download in "movies" format, the size of the file-s is: 22.17 Mbs, the file-s for this book were downloaded 1 times, the file-s went public at Mon Jun 30 2025.
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47Torpedo Bats: Yankees' Home Run Surge Explained
By BTVAccess
Discover the explosive power of torpedo bats and how they led to an incredible home run record on opening day! We delve into insights from MIT’s Aaron Leinhart, revealing how offense can shine even in a pitching-dominated era. #TorpedoBats #YankeesHomeRuns #MLB2023 #BaseballInsights #SportsScience #AaronLeinhart #HomeRunHistory #OffensiveStrategy #BaseballAnalysis #sportstrends shout out to @baseballbatbros
“Torpedo Bats: Yankees' Home Run Surge Explained” Metadata:
- Title: ➤ Torpedo Bats: Yankees' Home Run Surge Explained
- Author: BTVAccess
- Language: English
“Torpedo Bats: Yankees' Home Run Surge Explained” Subjects and Themes:
- Subjects: ➤ Massachusetts - Bridgewater - Bridgewater TV Access - BTVAccess - Public Access TV - Community Media - PEG - Youtube - 2025
Edition Identifiers:
- Internet Archive ID: ➤ btvma-Torpedo_Bats_-_Yankees_Home_Run_Surge_Explained
Downloads Information:
The book is available for download in "movies" format, the size of the file-s is: 21.13 Mbs, the file-s for this book were downloaded 6 times, the file-s went public at Fri May 23 2025.
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48Return Of The Home Run Kid
By Christopher, Matt, 1917-1997
Discover the explosive power of torpedo bats and how they led to an incredible home run record on opening day! We delve into insights from MIT’s Aaron Leinhart, revealing how offense can shine even in a pitching-dominated era. #TorpedoBats #YankeesHomeRuns #MLB2023 #BaseballInsights #SportsScience #AaronLeinhart #HomeRunHistory #OffensiveStrategy #BaseballAnalysis #sportstrends shout out to @baseballbatbros
“Return Of The Home Run Kid” Metadata:
- Title: Return Of The Home Run Kid
- Author: Christopher, Matt, 1917-1997
- Language: English
“Return Of The Home Run Kid” Subjects and Themes:
- Subjects: Baseball stories - Baseball -- Fiction
Edition Identifiers:
- Internet Archive ID: returnofhomerunk0000chri
Downloads Information:
The book is available for download in "texts" format, the size of the file-s is: 460.18 Mbs, the file-s for this book were downloaded 34 times, the file-s went public at Sat Feb 12 2022.
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49Running A B & B : A Landlady's Guide : A Practical Guide For Anyone Planning To Set Up And Run A Small B & B In Their Home
By Milner, Christabel
Discover the explosive power of torpedo bats and how they led to an incredible home run record on opening day! We delve into insights from MIT’s Aaron Leinhart, revealing how offense can shine even in a pitching-dominated era. #TorpedoBats #YankeesHomeRuns #MLB2023 #BaseballInsights #SportsScience #AaronLeinhart #HomeRunHistory #OffensiveStrategy #BaseballAnalysis #sportstrends shout out to @baseballbatbros
“Running A B & B : A Landlady's Guide : A Practical Guide For Anyone Planning To Set Up And Run A Small B & B In Their Home” Metadata:
- Title: ➤ Running A B & B : A Landlady's Guide : A Practical Guide For Anyone Planning To Set Up And Run A Small B & B In Their Home
- Author: Milner, Christabel
- Language: English
“Running A B & B : A Landlady's Guide : A Practical Guide For Anyone Planning To Set Up And Run A Small B & B In Their Home” Subjects and Themes:
- Subjects: ➤ Bed and breakfast accommodations -- Management - Chambre et petit déjeuner (Hôtellerie) -- Gestion - BUSINESS & ECONOMICS -- Small Business
Edition Identifiers:
- Internet Archive ID: runningbblandlad0000miln
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The book is available for download in "texts" format, the size of the file-s is: 347.90 Mbs, the file-s for this book were downloaded 19 times, the file-s went public at Fri Jun 10 2022.
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50Funny Or Die Video F2beec09b0: Barry Bonds Home Run
By Funny or Die
Find out who caught the million dollar ball.
“Funny Or Die Video F2beec09b0: Barry Bonds Home Run” Metadata:
- Title: ➤ Funny Or Die Video F2beec09b0: Barry Bonds Home Run
- Author: Funny or Die
- Language: English
“Funny Or Die Video F2beec09b0: Barry Bonds Home Run” Subjects and Themes:
- Subjects: ➤ Funny or Die Video Archive - Barry Bonds - Million dollar - baseball - home run - homerun
Edition Identifiers:
- Internet Archive ID: funny_or_die_video_f2beec09b0
Downloads Information:
The book is available for download in "movies" format, the size of the file-s is: 10.13 Mbs, the file-s for this book were downloaded 28 times, the file-s went public at Wed Sep 10 2014.
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Source: The Open Library
The Open Library Search Results
Available books for downloads and borrow from The Open Library
1Home Runs in the Old Ballparks
By David W. Vincent

“Home Runs in the Old Ballparks” Metadata:
- Title: Home Runs in the Old Ballparks
- Author: David W. Vincent
- Language: English
- Number of Pages: Median: 48
- Publisher: ➤ Society for American Baseball Research
- Publish Date: 1995
- Dewey Decimal Classification:
- Library of Congress Classification: GV-0868.40000000.H66 1995
“Home Runs in the Old Ballparks” Subjects and Themes:
- Subjects: Home runs (Baseball) - Statistics - Baseball fields - Honkbal
Edition Identifiers:
- The Open Library ID: OL8296380M
- Online Computer Library Center (OCLC) ID: 34091717
- All ISBNs: 9780910137652 - 091013765X
Book Classifications
- Library of Congress Classification (LCC): ➤ ❛GV-0868.40000000.H66 1995❜.
Access and General Info:
- First Year Published: 1995
- Is Full Text Available: Yes
- Is The Book Public: No
- Access Status: Borrowable
Online Access
Downloads Are Not Available:
The book is not public therefore the download links will not allow the download of the entire book, however, borrowing the book online is available.
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2Home Run
By Vincent, David and Jayson Stark

“Home Run” Metadata:
- Title: Home Run
- Authors: Vincent, DavidJayson Stark
- Language: English
- Number of Pages: Median: 304
- Publisher: Potomac Books, Incorporated
- Publish Date: 2008
- Dewey Decimal Classification:
- Library of Congress Classification: GV-0868.40000000.V56 2007GV-0868.40000000
“Home Run” Subjects and Themes:
- Subjects: Baseball, history - Home runs (Baseball) - History
Edition Identifiers:
- The Open Library ID: OL29049689M
- All ISBNs: 1597970360 - 9781597970365
Book Classifications
- Library of Congress Classification (LCC): ➤ ❛GV-0868.40000000.V56 2007❜ & ❛GV-0868.40000000❜.
Access and General Info:
- First Year Published: 2008
- Is Full Text Available: Yes
- Is The Book Public: No
- Access Status: Borrowable
Online Access
Downloads Are Not Available:
The book is not public therefore the download links will not allow the download of the entire book, however, borrowing the book online is available.
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