Ideal Graph Visualizer

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Thomas E Enebo edited this page Apr 17, 2024 · 1 revision

Ideal Graph Visualizer (IGV) is a tool shipped with OpenJDK. It allows you do see a graph of internal representations of Java. JRuby also has the ability to visualize JRuby's IR using this tool. This page talks about how to use it.

First you need IGV which can be retrieved by checking out OpenJDK source (there may be other links to pre-built version but I have not seen one). You cd into the igv directory and do mvn package. This will create a zip file and also a subdirectory with the contents of that file. I just do cp -rp application/target/idealgraphvisualizer ~/Applications/ and that directory has a bin directory containing idealgraphvisualizer.

To see some JRuby IR you are interested in you need to have IGV running. This running process is listening to localhost:4444. Then it is as simple as running your application with the option -Xir.debug.igv=. The value for this option is either the filename as it will be required/loaded and optionally the linenumber where the scope you want to see begins.

For whole file I would run a command line like: jruby -Xir.debug.igv=../snippets/while2.rb ../snippets/while2.rb. If I only cared about a single scope this would look like jruby -Xir.debug.igv=../snippets/while2.rb:2 ../snippets/while2.rb.

Once you have run the command you will see an entry show up on the left side which can be expanded. Once expanded you will see all compiler passes we execute on the IR. If you click on the first one in the list this is the initial CFG. The middle section of IGV will show you the instructions. Be sure to select the button 'Cluster nodes into blocks' This will visually wrap the instructions into their BasicBlocks. Now if you select the right arrow in the middle ('Expand the difference selection') you will go to next compiler pass. This will also show removed instrs in red and new instrs in green.

This should be enough info for people to be able to examine the IR we generate.

Add a custom sidebar

Clone this wiki locally

, '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
Ideal Graph Visualizer
Jump to bottomEditNew page

Thomas E Enebo edited this page Apr 17, 2024
·
1 revision
Ideal Graph Visualizer (IGV) is a tool shipped with OpenJDK. It
allows you do see a graph of internal representations of Java. JRuby also has the ability to visualize JRuby's IR using this tool. This page talks about how to use it.
First you need IGV which can be retrieved by checking out OpenJDK source (there may be other links to pre-built version but I have not seen one). You cd into the igv directory and do mvn package. This will create a zip file and also a subdirectory with the contents of that file. I just do cp -rp application/target/idealgraphvisualizer ~/Applications/ and that directory has a bin directory containing idealgraphvisualizer.
To see some JRuby IR you are interested in you need to have IGV running. This running process is listening to localhost:4444. Then it is as simple as running your application with the option -Xir.debug.igv=. The value for this option is either the filename as it will be required/loaded and optionally the linenumber where the scope you want to see begins.
For whole file I would run a command line like: jruby -Xir.debug.igv=../snippets/while2.rb ../snippets/while2.rb. If I only cared about a single scope this would look like jruby -Xir.debug.igv=../snippets/while2.rb:2 ../snippets/while2.rb.
Once you have run the command you will see an entry show up on the left side which can be expanded. Once expanded you will see all compiler passes we execute on the IR. If you click on the first one in the list this is the initial CFG. The middle section of IGV will show you the instructions. Be sure to select the button 'Cluster nodes into blocks' This will visually wrap the instructions into their BasicBlocks. Now if you select the right arrow in the middle ('Expand the difference selection') you will go to next compiler pass. This will also show removed instrs in red and new instrs in green.
This should be enough info for people to be able to examine the IR we generate.
 Add a custom sidebar

Clone this wiki locally

, '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
Ideal Graph Visualizer
Jump to bottomEditNew page

Thomas E Enebo edited this page Apr 17, 2024
·
1 revision
Ideal Graph Visualizer (IGV) is a tool shipped with OpenJDK. It
allows you do see a graph of internal representations of Java. JRuby also has the ability to visualize JRuby's IR using this tool. This page talks about how to use it.
First you need IGV which can be retrieved by checking out OpenJDK source (there may be other links to pre-built version but I have not seen one). You cd into the igv directory and do mvn package. This will create a zip file and also a subdirectory with the contents of that file. I just do cp -rp application/target/idealgraphvisualizer ~/Applications/ and that directory has a bin directory containing idealgraphvisualizer.
To see some JRuby IR you are interested in you need to have IGV running. This running process is listening to localhost:4444. Then it is as simple as running your application with the option -Xir.debug.igv=. The value for this option is either the filename as it will be required/loaded and optionally the linenumber where the scope you want to see begins.
For whole file I would run a command line like: jruby -Xir.debug.igv=../snippets/while2.rb ../snippets/while2.rb. If I only cared about a single scope this would look like jruby -Xir.debug.igv=../snippets/while2.rb:2 ../snippets/while2.rb.
Once you have run the command you will see an entry show up on the left side which can be expanded. Once expanded you will see all compiler passes we execute on the IR. If you click on the first one in the list this is the initial CFG. The middle section of IGV will show you the instructions. Be sure to select the button 'Cluster nodes into blocks' This will visually wrap the instructions into their BasicBlocks. Now if you select the right arrow in the middle ('Expand the difference selection') you will go to next compiler pass. This will also show removed instrs in red and new instrs in green.
This should be enough info for people to be able to examine the IR we generate.
 Add a custom sidebar

Clone this wiki locally

, '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
Ideal Graph Visualizer
Jump to bottomEditNew page

Thomas E Enebo edited this page Apr 17, 2024
·
1 revision
Ideal Graph Visualizer (IGV) is a tool shipped with OpenJDK. It
allows you do see a graph of internal representations of Java. JRuby also has the ability to visualize JRuby's IR using this tool. This page talks about how to use it.
First you need IGV which can be retrieved by checking out OpenJDK source (there may be other links to pre-built version but I have not seen one). You cd into the igv directory and do mvn package. This will create a zip file and also a subdirectory with the contents of that file. I just do cp -rp application/target/idealgraphvisualizer ~/Applications/ and that directory has a bin directory containing idealgraphvisualizer.
To see some JRuby IR you are interested in you need to have IGV running. This running process is listening to localhost:4444. Then it is as simple as running your application with the option -Xir.debug.igv=. The value for this option is either the filename as it will be required/loaded and optionally the linenumber where the scope you want to see begins.
For whole file I would run a command line like: jruby -Xir.debug.igv=../snippets/while2.rb ../snippets/while2.rb. If I only cared about a single scope this would look like jruby -Xir.debug.igv=../snippets/while2.rb:2 ../snippets/while2.rb.
Once you have run the command you will see an entry show up on the left side which can be expanded. Once expanded you will see all compiler passes we execute on the IR. If you click on the first one in the list this is the initial CFG. The middle section of IGV will show you the instructions. Be sure to select the button 'Cluster nodes into blocks' This will visually wrap the instructions into their BasicBlocks. Now if you select the right arrow in the middle ('Expand the difference selection') you will go to next compiler pass. This will also show removed instrs in red and new instrs in green.
This should be enough info for people to be able to examine the IR we generate.
 Add a custom sidebar

Clone this wiki locally

, '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
Ideal Graph Visualizer
Jump to bottomEditNew page

Thomas E Enebo edited this page Apr 17, 2024
·
1 revision
Ideal Graph Visualizer (IGV) is a tool shipped with OpenJDK. It
allows you do see a graph of internal representations of Java. JRuby also has the ability to visualize JRuby's IR using this tool. This page talks about how to use it.
First you need IGV which can be retrieved by checking out OpenJDK source (there may be other links to pre-built version but I have not seen one). You cd into the igv directory and do mvn package. This will create a zip file and also a subdirectory with the contents of that file. I just do cp -rp application/target/idealgraphvisualizer ~/Applications/ and that directory has a bin directory containing idealgraphvisualizer.
To see some JRuby IR you are interested in you need to have IGV running. This running process is listening to localhost:4444. Then it is as simple as running your application with the option -Xir.debug.igv=. The value for this option is either the filename as it will be required/loaded and optionally the linenumber where the scope you want to see begins.
For whole file I would run a command line like: jruby -Xir.debug.igv=../snippets/while2.rb ../snippets/while2.rb. If I only cared about a single scope this would look like jruby -Xir.debug.igv=../snippets/while2.rb:2 ../snippets/while2.rb.
Once you have run the command you will see an entry show up on the left side which can be expanded. Once expanded you will see all compiler passes we execute on the IR. If you click on the first one in the list this is the initial CFG. The middle section of IGV will show you the instructions. Be sure to select the button 'Cluster nodes into blocks' This will visually wrap the instructions into their BasicBlocks. Now if you select the right arrow in the middle ('Expand the difference selection') you will go to next compiler pass. This will also show removed instrs in red and new instrs in green.
This should be enough info for people to be able to examine the IR we generate.
 Add a custom sidebar

Clone this wiki locally

, '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
Ideal Graph Visualizer
Jump to bottomEditNew page

Thomas E Enebo edited this page Apr 17, 2024
·
1 revision
Ideal Graph Visualizer (IGV) is a tool shipped with OpenJDK. It
allows you do see a graph of internal representations of Java. JRuby also has the ability to visualize JRuby's IR using this tool. This page talks about how to use it.
First you need IGV which can be retrieved by checking out OpenJDK source (there may be other links to pre-built version but I have not seen one). You cd into the igv directory and do mvn package. This will create a zip file and also a subdirectory with the contents of that file. I just do cp -rp application/target/idealgraphvisualizer ~/Applications/ and that directory has a bin directory containing idealgraphvisualizer.
To see some JRuby IR you are interested in you need to have IGV running. This running process is listening to localhost:4444. Then it is as simple as running your application with the option -Xir.debug.igv=. The value for this option is either the filename as it will be required/loaded and optionally the linenumber where the scope you want to see begins.
For whole file I would run a command line like: jruby -Xir.debug.igv=../snippets/while2.rb ../snippets/while2.rb. If I only cared about a single scope this would look like jruby -Xir.debug.igv=../snippets/while2.rb:2 ../snippets/while2.rb.
Once you have run the command you will see an entry show up on the left side which can be expanded. Once expanded you will see all compiler passes we execute on the IR. If you click on the first one in the list this is the initial CFG. The middle section of IGV will show you the instructions. Be sure to select the button 'Cluster nodes into blocks' This will visually wrap the instructions into their BasicBlocks. Now if you select the right arrow in the middle ('Expand the difference selection') you will go to next compiler pass. This will also show removed instrs in red and new instrs in green.
This should be enough info for people to be able to examine the IR we generate.
 Add a custom sidebar

Clone this wiki locally

, '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
Ideal Graph Visualizer
Jump to bottomEditNew page

Thomas E Enebo edited this page Apr 17, 2024
·
1 revision
Ideal Graph Visualizer (IGV) is a tool shipped with OpenJDK. It
allows you do see a graph of internal representations of Java. JRuby also has the ability to visualize JRuby's IR using this tool. This page talks about how to use it.
First you need IGV which can be retrieved by checking out OpenJDK source (there may be other links to pre-built version but I have not seen one). You cd into the igv directory and do mvn package. This will create a zip file and also a subdirectory with the contents of that file. I just do cp -rp application/target/idealgraphvisualizer ~/Applications/ and that directory has a bin directory containing idealgraphvisualizer.
To see some JRuby IR you are interested in you need to have IGV running. This running process is listening to localhost:4444. Then it is as simple as running your application with the option -Xir.debug.igv=. The value for this option is either the filename as it will be required/loaded and optionally the linenumber where the scope you want to see begins.
For whole file I would run a command line like: jruby -Xir.debug.igv=../snippets/while2.rb ../snippets/while2.rb. If I only cared about a single scope this would look like jruby -Xir.debug.igv=../snippets/while2.rb:2 ../snippets/while2.rb.
Once you have run the command you will see an entry show up on the left side which can be expanded. Once expanded you will see all compiler passes we execute on the IR. If you click on the first one in the list this is the initial CFG. The middle section of IGV will show you the instructions. Be sure to select the button 'Cluster nodes into blocks' This will visually wrap the instructions into their BasicBlocks. Now if you select the right arrow in the middle ('Expand the difference selection') you will go to next compiler pass. This will also show removed instrs in red and new instrs in green.
This should be enough info for people to be able to examine the IR we generate.
 Add a custom sidebar

Clone this wiki locally

, '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); }
})();
})();

Skip to content
Ideal Graph Visualizer
Jump to bottomEditNew page

Thomas E Enebo edited this page Apr 17, 2024
·
1 revision
Ideal Graph Visualizer (IGV) is a tool shipped with OpenJDK. It
allows you do see a graph of internal representations of Java. JRuby also has the ability to visualize JRuby's IR using this tool. This page talks about how to use it.
First you need IGV which can be retrieved by checking out OpenJDK source (there may be other links to pre-built version but I have not seen one). You cd into the igv directory and do mvn package. This will create a zip file and also a subdirectory with the contents of that file. I just do cp -rp application/target/idealgraphvisualizer ~/Applications/ and that directory has a bin directory containing idealgraphvisualizer.
To see some JRuby IR you are interested in you need to have IGV running. This running process is listening to localhost:4444. Then it is as simple as running your application with the option -Xir.debug.igv=. The value for this option is either the filename as it will be required/loaded and optionally the linenumber where the scope you want to see begins.
For whole file I would run a command line like: jruby -Xir.debug.igv=../snippets/while2.rb ../snippets/while2.rb. If I only cared about a single scope this would look like jruby -Xir.debug.igv=../snippets/while2.rb:2 ../snippets/while2.rb.
Once you have run the command you will see an entry show up on the left side which can be expanded. Once expanded you will see all compiler passes we execute on the IR. If you click on the first one in the list this is the initial CFG. The middle section of IGV will show you the instructions. Be sure to select the button 'Cluster nodes into blocks' This will visually wrap the instructions into their BasicBlocks. Now if you select the right arrow in the middle ('Expand the difference selection') you will go to next compiler pass. This will also show removed instrs in red and new instrs in green.
This should be enough info for people to be able to examine the IR we generate.
 Add a custom sidebar

Clone this wiki locally