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Code TestsNotebook TestsStatic Type CheckingImportsWebsite www.debuggingbook.org

Launch BinderMade with PythonMade with JupyterLicense: MIT (Code), CC BY-NC-SA (Book)

About this Book

Welcome to "The Debugging Book"! Software has bugs, and finding bugs can involve lots of effort. This book addresses this problem by automating software debugging, specifically by locating errors and their causes automatically. Recent years have seen the development of novel techniques that lead to dramatic improvements in automated software debugging. They now are mature enough to be assembled in a book – even with executable code.

frombookutilsimportYouTubeVideoYouTubeVideo("-nOxI6Ev_I4")

A Textbook for Paper, Screen, and Keyboard

You can use this book in four ways:

  • You can read chapters in your browser. Check out the list of chapters in the menu above, or start right away with the introduction to debugging or how debuggers work. All code is available for download.

  • You can interact with chapters as Jupyter Notebooks (beta). This allows you to edit and extend the code, experimenting live in your browser. Simply select "Resources → Edit as Notebook" at the top of each chapter. Try interacting with the introduction to interactive debuggers.

  • You can use the code in your own projects. You can download the code as Python programs; simply select "Resources → Download Code" for one chapter or "Resources → All Code" for all chapters. These code files can be executed, yielding (hopefully) the same results as the notebooks. Once the book is out of beta, you can also install the Python package.

  • You can present chapters as slides. This allows for presenting the material in lectures. Just select "Resources → View slides" at the top of each chapter. Try viewing the slides for how debuggers work.

Who this Book is for

This work is designed as a textbook for a course in software debugging; as supplementary material in a software testing or software engineering course; and as a resource for software developers. We cover fault localization, program slicing, input reduction, automated repair, and much more, illustrating all techniques with code examples that you can try out yourself.

News

This book is work in progress. All chapters planned are out now, but we keep on refining text and code with minor and major releases. To get notified on updates, follow us on Mastodon.

About

Project page for "The Debugging Book"

www.debuggingbook.org/

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
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Code TestsNotebook TestsStatic Type CheckingImportsWebsite www.debuggingbook.org
Launch BinderMade with PythonMade with JupyterLicense: MIT (Code), CC BY-NC-SA (Book)
About this Book
Welcome to "The Debugging Book"!
Software has bugs, and finding bugs can involve lots of effort. This book addresses this problem by automating software debugging, specifically by locating errors and their causes automatically. Recent years have seen the development of novel techniques that lead to dramatic improvements in automated software debugging. They now are mature enough to be assembled in a book – even with executable code.
frombookutilsimportYouTubeVideoYouTubeVideo("-nOxI6Ev_I4")
A Textbook for Paper, Screen, and Keyboard
You can use this book in four ways:
  • You can read chapters in your browser. Check out the list of chapters in the menu above, or start right away with the introduction to debugging or how debuggers work. All code is available for download.
  • You can interact with chapters as Jupyter Notebooks (beta). This allows you to edit and extend the code, experimenting live in your browser. Simply select "Resources → Edit as Notebook" at the top of each chapter. Try interacting with the introduction to interactive debuggers.
  • You can use the code in your own projects. You can download the code as Python programs; simply select "Resources → Download Code" for one chapter or "Resources → All Code" for all chapters. These code files can be executed, yielding (hopefully) the same results as the notebooks. Once the book is out of beta, you can also install the Python package.
  • You can present chapters as slides. This allows for presenting the material in lectures. Just select "Resources → View slides" at the top of each chapter. Try viewing the slides for how debuggers work.
Who this Book is for
This work is designed as a textbook for a course in software debugging; as supplementary material in a software testing or software engineering course; and as a resource for software developers. We cover fault localization, program slicing, input reduction, automated repair, and much more, illustrating all techniques with code examples that you can try out yourself.
News
This book is work in progress. All chapters planned are out now, but we keep on refining text and code with minor and major releases. To get notified on updates, follow us on Mastodon.
About
Project page for "The Debugging Book"
www.debuggingbook.org/
Resources
Readme
License
Activity
Stars
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0 watching
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0 forks
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
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Code TestsNotebook TestsStatic Type CheckingImportsWebsite www.debuggingbook.org
Launch BinderMade with PythonMade with JupyterLicense: MIT (Code), CC BY-NC-SA (Book)
About this Book
Welcome to "The Debugging Book"!
Software has bugs, and finding bugs can involve lots of effort. This book addresses this problem by automating software debugging, specifically by locating errors and their causes automatically. Recent years have seen the development of novel techniques that lead to dramatic improvements in automated software debugging. They now are mature enough to be assembled in a book – even with executable code.
frombookutilsimportYouTubeVideoYouTubeVideo("-nOxI6Ev_I4")
A Textbook for Paper, Screen, and Keyboard
You can use this book in four ways:
  • You can read chapters in your browser. Check out the list of chapters in the menu above, or start right away with the introduction to debugging or how debuggers work. All code is available for download.
  • You can interact with chapters as Jupyter Notebooks (beta). This allows you to edit and extend the code, experimenting live in your browser. Simply select "Resources → Edit as Notebook" at the top of each chapter. Try interacting with the introduction to interactive debuggers.
  • You can use the code in your own projects. You can download the code as Python programs; simply select "Resources → Download Code" for one chapter or "Resources → All Code" for all chapters. These code files can be executed, yielding (hopefully) the same results as the notebooks. Once the book is out of beta, you can also install the Python package.
  • You can present chapters as slides. This allows for presenting the material in lectures. Just select "Resources → View slides" at the top of each chapter. Try viewing the slides for how debuggers work.
Who this Book is for
This work is designed as a textbook for a course in software debugging; as supplementary material in a software testing or software engineering course; and as a resource for software developers. We cover fault localization, program slicing, input reduction, automated repair, and much more, illustrating all techniques with code examples that you can try out yourself.
News
This book is work in progress. All chapters planned are out now, but we keep on refining text and code with minor and major releases. To get notified on updates, follow us on Mastodon.
About
Project page for "The Debugging Book"
www.debuggingbook.org/
Resources
Readme
License
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
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Contributors
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
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Code TestsNotebook TestsStatic Type CheckingImportsWebsite www.debuggingbook.org
Launch BinderMade with PythonMade with JupyterLicense: MIT (Code), CC BY-NC-SA (Book)
About this Book
Welcome to "The Debugging Book"!
Software has bugs, and finding bugs can involve lots of effort. This book addresses this problem by automating software debugging, specifically by locating errors and their causes automatically. Recent years have seen the development of novel techniques that lead to dramatic improvements in automated software debugging. They now are mature enough to be assembled in a book – even with executable code.
frombookutilsimportYouTubeVideoYouTubeVideo("-nOxI6Ev_I4")
A Textbook for Paper, Screen, and Keyboard
You can use this book in four ways:
  • You can read chapters in your browser. Check out the list of chapters in the menu above, or start right away with the introduction to debugging or how debuggers work. All code is available for download.
  • You can interact with chapters as Jupyter Notebooks (beta). This allows you to edit and extend the code, experimenting live in your browser. Simply select "Resources → Edit as Notebook" at the top of each chapter. Try interacting with the introduction to interactive debuggers.
  • You can use the code in your own projects. You can download the code as Python programs; simply select "Resources → Download Code" for one chapter or "Resources → All Code" for all chapters. These code files can be executed, yielding (hopefully) the same results as the notebooks. Once the book is out of beta, you can also install the Python package.
  • You can present chapters as slides. This allows for presenting the material in lectures. Just select "Resources → View slides" at the top of each chapter. Try viewing the slides for how debuggers work.
Who this Book is for
This work is designed as a textbook for a course in software debugging; as supplementary material in a software testing or software engineering course; and as a resource for software developers. We cover fault localization, program slicing, input reduction, automated repair, and much more, illustrating all techniques with code examples that you can try out yourself.
News
This book is work in progress. All chapters planned are out now, but we keep on refining text and code with minor and major releases. To get notified on updates, follow us on Mastodon.
About
Project page for "The Debugging Book"
www.debuggingbook.org/
Resources
Readme
License
Activity
Stars
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0 watching
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0 forks
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
BranchesTags
Repository files navigation
Code TestsNotebook TestsStatic Type CheckingImportsWebsite www.debuggingbook.org
Launch BinderMade with PythonMade with JupyterLicense: MIT (Code), CC BY-NC-SA (Book)
About this Book
Welcome to "The Debugging Book"!
Software has bugs, and finding bugs can involve lots of effort. This book addresses this problem by automating software debugging, specifically by locating errors and their causes automatically. Recent years have seen the development of novel techniques that lead to dramatic improvements in automated software debugging. They now are mature enough to be assembled in a book – even with executable code.
frombookutilsimportYouTubeVideoYouTubeVideo("-nOxI6Ev_I4")
A Textbook for Paper, Screen, and Keyboard
You can use this book in four ways:
  • You can read chapters in your browser. Check out the list of chapters in the menu above, or start right away with the introduction to debugging or how debuggers work. All code is available for download.
  • You can interact with chapters as Jupyter Notebooks (beta). This allows you to edit and extend the code, experimenting live in your browser. Simply select "Resources → Edit as Notebook" at the top of each chapter. Try interacting with the introduction to interactive debuggers.
  • You can use the code in your own projects. You can download the code as Python programs; simply select "Resources → Download Code" for one chapter or "Resources → All Code" for all chapters. These code files can be executed, yielding (hopefully) the same results as the notebooks. Once the book is out of beta, you can also install the Python package.
  • You can present chapters as slides. This allows for presenting the material in lectures. Just select "Resources → View slides" at the top of each chapter. Try viewing the slides for how debuggers work.
Who this Book is for
This work is designed as a textbook for a course in software debugging; as supplementary material in a software testing or software engineering course; and as a resource for software developers. We cover fault localization, program slicing, input reduction, automated repair, and much more, illustrating all techniques with code examples that you can try out yourself.
News
This book is work in progress. All chapters planned are out now, but we keep on refining text and code with minor and major releases. To get notified on updates, follow us on Mastodon.
About
Project page for "The Debugging Book"
www.debuggingbook.org/
Resources
Readme
License
Activity
Stars
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0 watching
Forks
0 forks
Report repository
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Contributors
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
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Code TestsNotebook TestsStatic Type CheckingImportsWebsite www.debuggingbook.org
Launch BinderMade with PythonMade with JupyterLicense: MIT (Code), CC BY-NC-SA (Book)
About this Book
Welcome to "The Debugging Book"!
Software has bugs, and finding bugs can involve lots of effort. This book addresses this problem by automating software debugging, specifically by locating errors and their causes automatically. Recent years have seen the development of novel techniques that lead to dramatic improvements in automated software debugging. They now are mature enough to be assembled in a book – even with executable code.
frombookutilsimportYouTubeVideoYouTubeVideo("-nOxI6Ev_I4")
A Textbook for Paper, Screen, and Keyboard
You can use this book in four ways:
  • You can read chapters in your browser. Check out the list of chapters in the menu above, or start right away with the introduction to debugging or how debuggers work. All code is available for download.
  • You can interact with chapters as Jupyter Notebooks (beta). This allows you to edit and extend the code, experimenting live in your browser. Simply select "Resources → Edit as Notebook" at the top of each chapter. Try interacting with the introduction to interactive debuggers.
  • You can use the code in your own projects. You can download the code as Python programs; simply select "Resources → Download Code" for one chapter or "Resources → All Code" for all chapters. These code files can be executed, yielding (hopefully) the same results as the notebooks. Once the book is out of beta, you can also install the Python package.
  • You can present chapters as slides. This allows for presenting the material in lectures. Just select "Resources → View slides" at the top of each chapter. Try viewing the slides for how debuggers work.
Who this Book is for
This work is designed as a textbook for a course in software debugging; as supplementary material in a software testing or software engineering course; and as a resource for software developers. We cover fault localization, program slicing, input reduction, automated repair, and much more, illustrating all techniques with code examples that you can try out yourself.
News
This book is work in progress. All chapters planned are out now, but we keep on refining text and code with minor and major releases. To get notified on updates, follow us on Mastodon.
About
Project page for "The Debugging Book"
www.debuggingbook.org/
Resources
Readme
License
Activity
Stars
0 stars
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0 watching
Forks
0 forks
Report repository
Releases
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
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Code TestsNotebook TestsStatic Type CheckingImportsWebsite www.debuggingbook.org
Launch BinderMade with PythonMade with JupyterLicense: MIT (Code), CC BY-NC-SA (Book)
About this Book
Welcome to "The Debugging Book"!
Software has bugs, and finding bugs can involve lots of effort. This book addresses this problem by automating software debugging, specifically by locating errors and their causes automatically. Recent years have seen the development of novel techniques that lead to dramatic improvements in automated software debugging. They now are mature enough to be assembled in a book – even with executable code.
frombookutilsimportYouTubeVideoYouTubeVideo("-nOxI6Ev_I4")
A Textbook for Paper, Screen, and Keyboard
You can use this book in four ways:
  • You can read chapters in your browser. Check out the list of chapters in the menu above, or start right away with the introduction to debugging or how debuggers work. All code is available for download.
  • You can interact with chapters as Jupyter Notebooks (beta). This allows you to edit and extend the code, experimenting live in your browser. Simply select "Resources → Edit as Notebook" at the top of each chapter. Try interacting with the introduction to interactive debuggers.
  • You can use the code in your own projects. You can download the code as Python programs; simply select "Resources → Download Code" for one chapter or "Resources → All Code" for all chapters. These code files can be executed, yielding (hopefully) the same results as the notebooks. Once the book is out of beta, you can also install the Python package.
  • You can present chapters as slides. This allows for presenting the material in lectures. Just select "Resources → View slides" at the top of each chapter. Try viewing the slides for how debuggers work.
Who this Book is for
This work is designed as a textbook for a course in software debugging; as supplementary material in a software testing or software engineering course; and as a resource for software developers. We cover fault localization, program slicing, input reduction, automated repair, and much more, illustrating all techniques with code examples that you can try out yourself.
News
This book is work in progress. All chapters planned are out now, but we keep on refining text and code with minor and major releases. To get notified on updates, follow us on Mastodon.
About
Project page for "The Debugging Book"
www.debuggingbook.org/
Resources
Readme
License
Activity
Stars
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0 watching
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0 forks
Report repository
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Contributors
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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Launch BinderMade with PythonMade with JupyterLicense: MIT (Code), CC BY-NC-SA (Book)
About this Book
Welcome to "The Debugging Book"!
Software has bugs, and finding bugs can involve lots of effort. This book addresses this problem by automating software debugging, specifically by locating errors and their causes automatically. Recent years have seen the development of novel techniques that lead to dramatic improvements in automated software debugging. They now are mature enough to be assembled in a book – even with executable code.
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A Textbook for Paper, Screen, and Keyboard
You can use this book in four ways:
  • You can read chapters in your browser. Check out the list of chapters in the menu above, or start right away with the introduction to debugging or how debuggers work. All code is available for download.
  • You can interact with chapters as Jupyter Notebooks (beta). This allows you to edit and extend the code, experimenting live in your browser. Simply select "Resources → Edit as Notebook" at the top of each chapter. Try interacting with the introduction to interactive debuggers.
  • You can use the code in your own projects. You can download the code as Python programs; simply select "Resources → Download Code" for one chapter or "Resources → All Code" for all chapters. These code files can be executed, yielding (hopefully) the same results as the notebooks. Once the book is out of beta, you can also install the Python package.
  • You can present chapters as slides. This allows for presenting the material in lectures. Just select "Resources → View slides" at the top of each chapter. Try viewing the slides for how debuggers work.
Who this Book is for
This work is designed as a textbook for a course in software debugging; as supplementary material in a software testing or software engineering course; and as a resource for software developers. We cover fault localization, program slicing, input reduction, automated repair, and much more, illustrating all techniques with code examples that you can try out yourself.
News
This book is work in progress. All chapters planned are out now, but we keep on refining text and code with minor and major releases. To get notified on updates, follow us on Mastodon.
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www.debuggingbook.org/
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