[tools] Improve system analyzer

Profiler:
  - Track profiler tick durations
  - Various speedups due to low-level hacking
Improve code-panel:
  - Better register highlighting
  - Added address navigation and highlighting
  - Removed obsolete inline source-view
Improve script-panel:
  - Keep current source position focused when showing related entries
  - Better tool-tip with buttons to focus on grouped entries per
    source postion
  - Focus by default on other views when showing related entries
Improve timeline-panel:
  - Initialise event handlers late to avoid errors
  - Lazy initialise chunks to avoid errors when zooming-in and trying to
    create tooltips at the same time


Change-Id: I3f3c0fd51985aaa490d62f786ab52a4be1eed292
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3492521Reviewed-by: Patrick Thier <pthier@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79329}

tools/codemap.mjs

@@ -27,6 +27,15 @@
 
 import { SplayTree } from "./splaytree.mjs";
 
+/**
+* The number of alignment bits in a page address.
+*/
+const kPageAlignment = 12;
+/**
+* Page size in bytes.
+*/
+const kPageSize =  1 << kPageAlignment;
+
 /**
  * Constructs a mapper that maps addresses into code entries.
  *
@@ -56,19 +65,7 @@ export class CodeMap {
   /**
    * Map of memory pages occupied with static code.
    */
-  pages_ = [];
-
-
-  /**
-   * The number of alignment bits in a page address.
-   */
-  static PAGE_ALIGNMENT = 12;
-
-
-  /**
-   * Page size in bytes.
-   */
-  static PAGE_SIZE =  1 << CodeMap.PAGE_ALIGNMENT;
+  pages_ = new Set();
 
 
   /**
@@ -130,9 +127,8 @@ export class CodeMap {
    * @private
    */
   markPages_(start, end) {
-    for (let addr = start; addr <= end;
-        addr += CodeMap.PAGE_SIZE) {
-      this.pages_[(addr / CodeMap.PAGE_SIZE)|0] = 1;
+    for (let addr = start; addr <= end; addr += kPageSize) {
+      this.pages_.add((addr / kPageSize) | 0);
     }
   }
 
@@ -144,7 +140,7 @@ export class CodeMap {
     let addr = end - 1;
     while (addr >= start) {
       const node = tree.findGreatestLessThan(addr);
-      if (!node) break;
+      if (node === null) break;
       const start2 = node.key, end2 = start2 + node.value.size;
       if (start2 < end && start < end2) to_delete.push(start2);
       addr = start2 - 1;
@@ -164,7 +160,7 @@ export class CodeMap {
    */
   findInTree_(tree, addr) {
     const node = tree.findGreatestLessThan(addr);
-    return node && this.isAddressBelongsTo_(addr, node) ? node : null;
+    return node !== null && this.isAddressBelongsTo_(addr, node) ? node : null;
   }
 
   /**
@@ -175,22 +171,23 @@ export class CodeMap {
    * @param {number} addr Address.
    */
   findAddress(addr) {
-    const pageAddr = (addr / CodeMap.PAGE_SIZE)|0;
-    if (pageAddr in this.pages_) {
+    const pageAddr = (addr / kPageSize) | 0;
+    if (this.pages_.has(pageAddr)) {
       // Static code entries can contain "holes" of unnamed code.
       // In this case, the whole library is assigned to this address.
       let result = this.findInTree_(this.statics_, addr);
-      if (!result) {
+      if (result === null) {
         result = this.findInTree_(this.libraries_, addr);
-        if (!result) return null;
+        if (result === null) return null;
       }
       return {entry: result.value, offset: addr - result.key};
     }
-    const min = this.dynamics_.findMin();
     const max = this.dynamics_.findMax();
-    if (max != null && addr < (max.key + max.value.size) && addr >= min.key) {
+    if (max === null) return null;
+    const min = this.dynamics_.findMin();
+    if (addr >= min.key && addr < (max.key + max.value.size)) {
       const dynaEntry = this.findInTree_(this.dynamics_, addr);
-      if (dynaEntry == null) return null;
+      if (dynaEntry === null) return null;
       // Dedupe entry name.
       const entry = dynaEntry.value;
       if (!entry.nameUpdated_) {
@@ -210,7 +207,7 @@ export class CodeMap {
    */
   findEntry(addr) {
     const result = this.findAddress(addr);
-    return result ? result.entry : null;
+    return result !== null ? result.entry : null;
   }
 
   /**
@@ -220,7 +217,7 @@ export class CodeMap {
    */
   findDynamicEntryByStartAddress(addr) {
     const node = this.dynamics_.find(addr);
-    return node ? node.value : null;
+    return node !== null ? node.value : null;
   }
 
   /**

tools/csvparser.mjs

@@ -38,13 +38,11 @@ export class CsvParser {
   escapeField(string) {
     let nextPos = string.indexOf("\\");
     if (nextPos === -1) return string;
-
     let result = string.substring(0, nextPos);
     // Escape sequences of the form \x00 and \u0000;
-    let endPos = string.length;
     let pos = 0;
     while (nextPos !== -1) {
-      let escapeIdentifier = string.charAt(nextPos + 1);
+      const escapeIdentifier = string.charAt(nextPos + 1);
       pos = nextPos + 2;
       if (escapeIdentifier === 'n') {
         result += '\n';
@@ -61,7 +59,7 @@ export class CsvParser {
           nextPos = pos + 4;
         }
         // Convert the selected escape sequence to a single character.
-        let escapeChars = string.substring(pos, nextPos);
+        const escapeChars = string.substring(pos, nextPos);
         if (escapeChars === '2C') {
             result += ',';
         } else {
@@ -75,6 +73,7 @@ export class CsvParser {
       // If there are no more escape sequences consume the rest of the string.
       if (nextPos === -1) {
         result += string.substr(pos);
+        break;
       } else if (pos !== nextPos) {
         result += string.substring(pos, nextPos);
       }

tools/dumpcpp.mjs

@@ -14,6 +14,7 @@ export class CppProcessor extends LogReader {
   constructor(cppEntriesProvider, timedRange, pairwiseTimedRange) {
     super({}, timedRange, pairwiseTimedRange);
     this.dispatchTable_ = {
+         __proto__: null,
         'shared-library': {
           parsers: [parseString, parseInt, parseInt, parseInt],
           processor: this.processSharedLibrary }

tools/js/web-api-helper.mjs

@@ -148,29 +148,28 @@ export class FileReader extends V8CustomElement {
 export class DOM {
   static element(type, options) {
     const node = document.createElement(type);
-    if (options !== undefined) {
-      if (typeof options === 'string') {
-        // Old behaviour: options = class string
-        node.className = options;
-      } else if (Array.isArray(options)) {
-        // Old behaviour: options = class array
-        DOM.addClasses(node, options);
-      } else {
-        // New behaviour: options = attribute dict
-        for (const [key, value] of Object.entries(options)) {
-          if (key == 'className') {
-            node.className = value;
-          } else if (key == 'classList') {
-            node.classList = value;
-          } else if (key == 'textContent') {
-            node.textContent = value;
-          } else if (key == 'children') {
-            for (const child of value) {
-              node.appendChild(child);
-            }
-          } else {
-            node.setAttribute(key, value);
+    if (options === undefined) return node;
+    if (typeof options === 'string') {
+      // Old behaviour: options = class string
+      node.className = options;
+    } else if (Array.isArray(options)) {
+      // Old behaviour: options = class array
+      DOM.addClasses(node, options);
+    } else {
+      // New behaviour: options = attribute dict
+      for (const [key, value] of Object.entries(options)) {
+        if (key == 'className') {
+          node.className = value;
+        } else if (key == 'classList') {
+          DOM.addClasses(node, value);
+        } else if (key == 'textContent') {
+          node.textContent = value;
+        } else if (key == 'children') {
+          for (const child of value) {
+            node.appendChild(child);
           }
+        } else {
+          node.setAttribute(key, value);
         }
       }
     }
@@ -196,6 +195,10 @@ export class DOM {
   static button(label, clickHandler) {
     const button = DOM.element('button');
     button.innerText = label;
+    if (typeof clickHandler != 'function') {
+      throw new Error(
+          `DOM.button: Expected function but got clickHandler=${clickHandler}`);
+    }
     button.onclick = clickHandler;
     return button;
   }
@@ -255,4 +258,4 @@ export class DOM {
             templateText =>
                 customElements.define(name, generator(templateText)));
   }
-}
\ No newline at end of file
+}

tools/logreader.mjs

@@ -179,16 +179,6 @@ export class LogReader {
     return fullStack;
   }
 
-  /**
-   * Returns whether a particular dispatch must be skipped.
-   *
-   * @param {!Object} dispatch Dispatch record.
-   * @return {boolean} True if dispatch must be skipped.
-   */
-  skipDispatch(dispatch) {
-    return false;
-  }
-
   /**
    * Does a dispatch of a log record.
    *
@@ -200,14 +190,12 @@ export class LogReader {
     const command = fields[0];
     const dispatch = this.dispatchTable_[command];
     if (dispatch === undefined) return;
-    if (dispatch === null || this.skipDispatch(dispatch)) {
-      return;
-    }
-
+    const parsers = dispatch.parsers;
+    const length = parsers.length;
     // Parse fields.
     const parsedFields = [];
-    for (let i = 0; i < dispatch.parsers.length; ++i) {
-      const parser = dispatch.parsers[i];
+    for (let i = 0; i < length; ++i) {
+      const parser = parsers[i];
       if (parser === parseString) {
         parsedFields.push(fields[1 + i]);
       } else if (typeof parser == 'function') {

tools/profile.mjs

@@ -261,6 +261,10 @@ class SourceInfo {
   }
 }
 
+const kProfileOperationMove = 0;
+const kProfileOperationDelete = 1;
+const kProfileOperationTick = 2;
+
 /**
  * Creates a profile object for processing profiling-related events
  * and calculating function execution times.
@@ -271,9 +275,10 @@ export class Profile {
   codeMap_ = new CodeMap();
   topDownTree_ = new CallTree();
   bottomUpTree_ = new CallTree();
-  c_entries_ = {};
+  c_entries_ = {__proto__:null};
   scripts_ = [];
   urlToScript_ = new Map();
+  warnings = new Set();
 
   serializeVMSymbols() {
     let result = this.codeMap_.getAllStaticEntriesWithAddresses();
@@ -300,9 +305,9 @@ export class Profile {
    * @enum {number}
    */
   static Operation = {
-    MOVE: 0,
-    DELETE: 1,
-    TICK: 2
+    MOVE: kProfileOperationMove,
+    DELETE: kProfileOperationDelete,
+    TICK: kProfileOperationTick
   }
 
   /**
@@ -454,7 +459,7 @@ export class Profile {
     // As code and functions are in the same address space,
     // it is safe to put them in a single code map.
     let func = this.codeMap_.findDynamicEntryByStartAddress(funcAddr);
-    if (!func) {
+    if (func === null) {
       func = new FunctionEntry(name);
       this.codeMap_.addCode(funcAddr, func);
     } else if (func.name !== name) {
@@ -462,7 +467,7 @@ export class Profile {
       func.name = name;
     }
     let entry = this.codeMap_.findDynamicEntryByStartAddress(start);
-    if (entry) {
+    if (entry !== null) {
       if (entry.size === size && entry.func === func) {
         // Entry state has changed.
         entry.state = state;
@@ -471,7 +476,7 @@ export class Profile {
         entry = null;
       }
     }
-    if (!entry) {
+    if (entry === null) {
       entry = new DynamicFuncCodeEntry(size, type, func, state);
       this.codeMap_.addCode(start, entry);
     }
@@ -488,7 +493,7 @@ export class Profile {
     try {
       this.codeMap_.moveCode(from, to);
     } catch (e) {
-      this.handleUnknownCode(Profile.Operation.MOVE, from);
+      this.handleUnknownCode(kProfileOperationMove, from);
     }
   }
 
@@ -505,7 +510,7 @@ export class Profile {
     try {
       this.codeMap_.deleteCode(start);
     } catch (e) {
-      this.handleUnknownCode(Profile.Operation.DELETE, start);
+      this.handleUnknownCode(kProfileOperationDelete, start);
     }
   }
 
@@ -516,16 +521,16 @@ export class Profile {
         inliningPositions, inlinedFunctions) {
     const script = this.getOrCreateScript(scriptId);
     const entry = this.codeMap_.findDynamicEntryByStartAddress(start);
-    if (!entry) return;
+    if (entry === null) return;
     // Resolve the inlined functions list.
     if (inlinedFunctions.length > 0) {
       inlinedFunctions = inlinedFunctions.substring(1).split("S");
       for (let i = 0; i < inlinedFunctions.length; i++) {
         const funcAddr = parseInt(inlinedFunctions[i]);
         const func = this.codeMap_.findDynamicEntryByStartAddress(funcAddr);
-        if (!func || func.funcId === undefined) {
+        if (func === null || func.funcId === undefined) {
           // TODO: fix
-          console.warn(`Could not find function ${inlinedFunctions[i]}`);
+          this.warnings.add(`Could not find function ${inlinedFunctions[i]}`);
           inlinedFunctions[i] = null;
         } else {
           inlinedFunctions[i] = func.funcId;
@@ -542,7 +547,9 @@ export class Profile {
 
   addDisassemble(start, kind, disassemble) {
     const entry = this.codeMap_.findDynamicEntryByStartAddress(start);
-    if (entry) this.getOrCreateSourceInfo(entry).setDisassemble(disassemble);
+    if (entry !== null) {
+      this.getOrCreateSourceInfo(entry).setDisassemble(disassemble);
+    }
     return entry;
   }
 
@@ -558,7 +565,7 @@ export class Profile {
 
   getOrCreateScript(id) {
     let script = this.scripts_[id];
-    if (!script) {
+    if (script === undefined) {
       script = new Script(id);
       this.scripts_[id] = script;
     }
@@ -618,7 +625,7 @@ export class Profile {
     for (let i = 0; i < stack.length; ++i) {
       const pc = stack[i];
       const entry = this.codeMap_.findEntry(pc);
-      if (entry) {
+      if (entry !== null) {
         entryStack.push(entry);
         const name = entry.getName();
         if (i === 0 && (entry.type === 'CPP' || entry.type === 'SHARED_LIB')) {
@@ -631,12 +638,13 @@ export class Profile {
           nameStack.push(name);
         }
       } else {
-        this.handleUnknownCode(Profile.Operation.TICK, pc, i);
+        this.handleUnknownCode(kProfileOperationTick, pc, i);
         if (i === 0) nameStack.push("UNKNOWN");
         entryStack.push(pc);
       }
       if (look_for_first_c_function && i > 0 &&
-          (!entry || entry.type !== 'CPP') && last_seen_c_function !== '') {
+          (entry === null || entry.type !== 'CPP')
+          && last_seen_c_function !== '') {
         if (this.c_entries_[last_seen_c_function] === undefined) {
           this.c_entries_[last_seen_c_function] = 0;
         }
@@ -711,7 +719,7 @@ export class Profile {
   getFlatProfile(opt_label) {
     const counters = new CallTree();
     const rootLabel = opt_label || CallTree.ROOT_NODE_LABEL;
-    const precs = {};
+    const precs = {__proto__:null};
     precs[rootLabel] = 0;
     const root = counters.findOrAddChild(rootLabel);
 
@@ -963,9 +971,7 @@ class CallTree {
    * @param {Array<string>} path Call path.
    */
   addPath(path) {
-    if (path.length == 0) {
-      return;
-    }
+    if (path.length == 0) return;
     let curr = this.root_;
     for (let i = 0; i < path.length; ++i) {
       curr = curr.findOrAddChild(path[i]);
@@ -1079,21 +1085,14 @@ class CallTree {
  * @param {CallTreeNode} opt_parent Node parent.
  */
 class CallTreeNode {
-  /**
-   * Node self weight (how many times this node was the last node in
-   * a call path).
-   * @type {number}
-   */
-  selfWeight = 0;
-
-  /**
-   * Node total weight (includes weights of all children).
-   * @type {number}
-   */
-  totalWeight = 0;
-  children = {};
 
   constructor(label, opt_parent) {
+    // Node self weight (how many times this node was the last node in
+    // a call path).
+    this.selfWeight = 0;
+    // Node total weight (includes weights of all children).
+    this.totalWeight = 0;
+    this. children = { __proto__:null };
     this.label = label;
     this.parent = opt_parent;
   }
@@ -1136,7 +1135,8 @@ class CallTreeNode {
    * @param {string} label Child node label.
    */
   findChild(label) {
-    return this.children[label] || null;
+    const found = this.children[label];
+    return found === undefined ? null : found;
   }
 
   /**
@@ -1146,7 +1146,9 @@ class CallTreeNode {
    * @param {string} label Child node label.
    */
   findOrAddChild(label) {
-    return this.findChild(label) || this.addChild(label);
+    const found = this.findChild(label)
+    if (found === null) return this.addChild(label);
+    return found;
   }
 
   /**
@@ -1166,7 +1168,7 @@ class CallTreeNode {
    * @param {function(CallTreeNode)} f Visitor function.
    */
   walkUpToRoot(f) {
-    for (let curr = this; curr != null; curr = curr.parent) {
+    for (let curr = this; curr !== null; curr = curr.parent) {
       f(curr);
     }
   }

tools/splaytree.mjs

@@ -49,7 +49,7 @@ export class SplayTree {
    * @return {boolean} Whether the tree is empty.
    */
   isEmpty() {
-    return !this.root_;
+    return this.root_ === null;
   }
 
   /**
@@ -100,7 +100,7 @@ export class SplayTree {
       throw Error(`Key not found: ${key}`);
     }
     const removed = this.root_;
-    if (!this.root_.left) {
+    if (this.root_.left === null) {
       this.root_ = this.root_.right;
     } else {
       const { right } = this.root_;
@@ -133,7 +133,7 @@ export class SplayTree {
   findMin() {
     if (this.isEmpty()) return null;
     let current = this.root_;
-    while (current.left) {
+    while (current.left !== null) {
       current = current.left;
     }
     return current;
@@ -145,7 +145,7 @@ export class SplayTree {
   findMax(opt_startNode) {
     if (this.isEmpty()) return null;
     let current = opt_startNode || this.root_;
-    while (current.right) {
+    while (current.right !== null) {
       current = current.right;
     }
     return current;
@@ -164,7 +164,7 @@ export class SplayTree {
     // the left subtree.
     if (this.root_.key <= key) {
       return this.root_;
-    } else if (this.root_.left) {
+    } else if (this.root_.left !== null) {
       return this.findMax(this.root_.left);
     } else {
       return null;
@@ -186,7 +186,7 @@ export class SplayTree {
    */
   exportValues() {
     const result = [];
-    this.traverse_(function(node) { result.push(node.value); });
+    this.traverse_(function(node) { result.push(node.value) });
     return result;
   }
 
@@ -212,36 +212,28 @@ export class SplayTree {
     let current = this.root_;
     while (true) {
       if (key < current.key) {
-        if (!current.left) {
-          break;
-        }
+        if (current.left === null) break;
         if (key < current.left.key) {
           // Rotate right.
           const tmp = current.left;
           current.left = tmp.right;
           tmp.right = current;
           current = tmp;
-          if (!current.left) {
-            break;
-          }
+          if (current.left === null) break;
         }
         // Link right.
         right.left = current;
         right = current;
         current = current.left;
       } else if (key > current.key) {
-        if (!current.right) {
-          break;
-        }
+        if (current.right === null) break;
         if (key > current.right.key) {
           // Rotate left.
           const tmp = current.right;
           current.right = tmp.left;
           tmp.left = current;
           current = tmp;
-          if (!current.right) {
-            break;
-          }
+          if (current.right === null) break;
         }
         // Link left.
         left.right = current;
@@ -269,9 +261,7 @@ export class SplayTree {
     const nodesToVisit = [this.root_];
     while (nodesToVisit.length > 0) {
       const node = nodesToVisit.shift();
-      if (node == null) {
-        continue;
-      }
+      if (node === null) continue;
       f(node);
       nodesToVisit.push(node.left);
       nodesToVisit.push(node.right);
@@ -298,4 +288,4 @@ class SplayTreeNode {
      */
     this.right = null;
   }
-};
\ No newline at end of file
+};

tools/system-analyzer/helper.mjs

@@ -64,4 +64,13 @@ export function groupBy(array, keyFunction, collect = false) {
   return groups.sort((a, b) => b.length - a.length);
 }
 
-export * from '../js/helper.mjs'
\ No newline at end of file
+export function arrayEquals(left, right) {
+  if (left == right) return true;
+  if (left.length != right.length) return false;
+  for (let i = 0; i < left.length; i++) {
+    if (left[i] != right[i]) return false;
+  }
+  return true;
+}
+
+export * from '../js/helper.mjs'

tools/system-analyzer/index.mjs

@@ -95,7 +95,7 @@ class App {
     document.addEventListener(
         SelectionEvent.name, e => this.handleSelectEntries(e))
     document.addEventListener(
-        FocusEvent.name, e => this.handleFocusLogEntryl(e));
+        FocusEvent.name, e => this.handleFocusLogEntry(e));
     document.addEventListener(
         SelectTimeEvent.name, e => this.handleTimeRangeSelect(e));
     document.addEventListener(ToolTipEvent.name, e => this.handleToolTip(e));
@@ -151,7 +151,7 @@ class App {
 
   handleSelectEntries(e) {
     e.stopImmediatePropagation();
-    this.showEntries(e.entries);
+    this.selectEntries(e.entries);
   }
 
   selectEntries(entries) {
@@ -160,29 +160,30 @@ class App {
       this.selectEntriesOfSingleType(group.entries);
       missingTypes.delete(group.key);
     });
-    missingTypes.forEach(type => this.selectEntriesOfSingleType([], type));
+    missingTypes.forEach(
+        type => this.selectEntriesOfSingleType([], type, false));
   }
 
-  selectEntriesOfSingleType(entries, type) {
+  selectEntriesOfSingleType(entries, type, focusView = true) {
     const entryType = entries[0]?.constructor ?? type;
     switch (entryType) {
       case Script:
         entries = entries.flatMap(script => script.sourcePositions);
-        return this.showSourcePositions(entries);
+        return this.showSourcePositions(entries, focusView);
       case SourcePosition:
-        return this.showSourcePositions(entries);
+        return this.showSourcePositions(entries, focusView);
       case MapLogEntry:
-        return this.showMapEntries(entries);
+        return this.showMapEntries(entries, focusView);
       case IcLogEntry:
-        return this.showIcEntries(entries);
+        return this.showIcEntries(entries, focusView);
       case ApiLogEntry:
-        return this.showApiEntries(entries);
+        return this.showApiEntries(entries, focusView);
       case CodeLogEntry:
-        return this.showCodeEntries(entries);
+        return this.showCodeEntries(entries, focusView);
       case DeoptLogEntry:
-        return this.showDeoptEntries(entries);
+        return this.showDeoptEntries(entries, focusView);
       case SharedLibLogEntry:
-        return this.showSharedLibEntries(entries);
+        return this.showSharedLibEntries(entries, focusView);
       case TimerLogEntry:
       case TickLogEntry:
         break;
@@ -245,7 +246,7 @@ class App {
     this._view.timelinePanel.timeSelection = {start, end};
   }
 
-  handleFocusLogEntryl(e) {
+  handleFocusLogEntry(e) {
     e.stopImmediatePropagation();
     this.focusLogEntry(e.entry);
   }
@@ -281,11 +282,11 @@ class App {
     this._state.map = entry;
     this._view.mapTrack.focusedEntry = entry;
     this._view.mapPanel.map = entry;
-    this._view.mapPanel.show();
     if (focusSourcePosition) {
       this.focusCodeLogEntry(entry.code, false);
       this.focusSourcePosition(entry.sourcePosition);
     }
+    this._view.mapPanel.show();
   }
 
   focusIcLogEntry(entry) {

tools/system-analyzer/log/code.mjs

@@ -66,6 +66,10 @@ export class CodeLogEntry extends LogEntry {
     return this._kindName === 'Builtin';
   }
 
+  get isBytecodeKind() {
+    return this._kindName === 'Unopt';
+  }
+
   get kindName() {
     return this._kindName;
   }

tools/system-analyzer/log/tick.mjs

@@ -10,6 +10,28 @@ export class TickLogEntry extends LogEntry {
     super(TickLogEntry.extractType(vmState, processedStack), time);
     this.state = vmState;
     this.stack = processedStack;
+    this._endTime = time;
+  }
+
+  end(time) {
+    if (this.isInitialized) throw new Error('Invalid timer change');
+    this._endTime = time;
+  }
+
+  get isInitialized() {
+    return this._endTime !== this._time;
+  }
+
+  get startTime() {
+    return this._time;
+  }
+
+  get endTime() {
+    return this._endTime;
+  }
+
+  get duration() {
+    return this._endTime - this._time;
   }
 
   static extractType(vmState, processedStack) {
@@ -34,4 +56,4 @@ export class TickLogEntry extends LogEntry {
     if (entry?.vmState) return Profile.vmStateString(entry.vmState);
     return 'Other';
   }
-}
\ No newline at end of file
+}

tools/system-analyzer/processor.mjs

@@ -59,6 +59,7 @@ export class Processor extends LogReader {
   _formatPCRegexp = /(.*):[0-9]+:[0-9]+$/;
   _lastTimestamp = 0;
   _lastCodeLogEntry;
+  _lastTickLogEntry;
   _chunkRemainder = '';
   MAJOR_VERSION = 7;
   MINOR_VERSION = 6;
@@ -248,6 +249,9 @@ export class Processor extends LogReader {
 
   async finalize() {
     await this._chunkConsumer.consumeAll();
+    if (this._profile.warnings.size > 0) {
+      console.warn('Found profiler warnings:', this._profile.warnings);
+    }
     // TODO(cbruni): print stats;
     this._mapTimeline.transitions = new Map();
     let id = 0;
@@ -387,7 +391,12 @@ export class Processor extends LogReader {
     const entryStack = this._profile.recordTick(
         time_ns, vmState,
         this.processStack(pc, tos_or_external_callback, stack));
-    this._tickTimeline.push(new TickLogEntry(time_ns, vmState, entryStack))
+    const newEntry = new TickLogEntry(time_ns, vmState, entryStack);
+    this._tickTimeline.push(newEntry);
+    if (this._lastTickLogEntry !== undefined) {
+      this._lastTickLogEntry.end(time_ns);
+    }
+    this._lastTickLogEntry = newEntry;
   }
 
   processCodeSourceInfo(

tools/system-analyzer/view/code-panel-template.html

@@ -9,17 +9,20 @@ found in the LICENSE file. -->
   #sourceCode {
     white-space: pre-line;
   }
-  .register {
+  .reg, .addr {
     border-bottom: 1px dashed;
     border-radius: 2px;
   }
-  .register:hover {
+  .reg:hover, .addr:hover {
     background-color: var(--border-color);
   }
-  .register.selected {
+  .reg.selected, .addr.selected {
     color: var(--default-color);
     background-color: var(--border-color);
   }
+  .addr:hover {
+    cursor: pointer;
+  }
 </style>
 
 <div class="panel">
@@ -37,7 +40,5 @@ found in the LICENSE file. -->
     <property-link-table id="feedbackVector"></property-link-table>
     <h3>Disassembly</h3>
     <pre id="disassembly"></pre>
-    <h3>Source Code</h3>
-    <pre id="sourceCode"></pre>
   </div>
 </div>

tools/system-analyzer/view/code-panel.mjs

 // Copyright 2020 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
+import {LinuxCppEntriesProvider} from '../../tickprocessor.mjs';
 import {SelectRelatedEvent} from './events.mjs';
 import {CollapsableElement, DOM, formatBytes, formatMicroSeconds} from './helper.mjs';
 
 const kRegisters = ['rsp', 'rbp', 'rax', 'rbx', 'rcx', 'rdx', 'rsi', 'rdi'];
-// Add Interpreter and x64 registers
-for (let i = 0; i < 14; i++) {
-  kRegisters.push(`r${i}`);
-}
+// Make sure we dont match register on bytecode: Star1 or Star2
+const kAvoidBytecodeOps = '(.*?[^a-zA-Z])'
+// Look for registers in strings like:  movl rbx,[rcx-0x30]
+const kRegisterRegexp = `(${kRegisters.join('|')}|r[0-9]+)`
+const kRegisterRegexpSplit =
+    new RegExp(`${kAvoidBytecodeOps}${kRegisterRegexp}`)
+const kIsRegisterRegexp = new RegExp(`^${kRegisterRegexp}$`);
+
+const kFullAddressRegexp = /(0x[0-9a-f]{8,})/;
+const kRelativeAddressRegexp = /([+-]0x[0-9a-f]+)/;
+const kAnyAddressRegexp = /([+-]?0x[0-9a-f]+)/;
 
 DOM.defineCustomElement('view/code-panel',
                         (templateText) =>
@@ -23,8 +31,7 @@ DOM.defineCustomElement('view/code-panel',
     this._codeSelectNode = this.$('#codeSelect');
     this._disassemblyNode = this.$('#disassembly');
     this._feedbackVectorNode = this.$('#feedbackVector');
-    this._sourceNode = this.$('#sourceCode');
-    this._registerSelector = new RegisterSelector(this._disassemblyNode);
+    this._selectionHandler = new SelectionHandler(this._disassemblyNode);
 
     this._codeSelectNode.onchange = this._handleSelectCode.bind(this);
     this.$('#selectedRelatedButton').onclick =
@@ -56,7 +63,8 @@ DOM.defineCustomElement('view/code-panel',
         script: entry.script,
         type: entry.type,
         kind: entry.kindName,
-        variants: entry.variants.length > 1 ? entry.variants : undefined,
+        variants: entry.variants.length > 1 ? [undefined, ...entry.variants] :
+                                              undefined,
       };
     }
     this.requestUpdate();
@@ -66,7 +74,6 @@ DOM.defineCustomElement('view/code-panel',
     this._updateSelect();
     this._updateDisassembly();
     this._updateFeedbackVector();
-    this._sourceNode.innerText = this._entry?.source ?? '';
   }
 
   _updateFeedbackVector() {
@@ -81,24 +88,14 @@ DOM.defineCustomElement('view/code-panel',
   }
 
   _updateDisassembly() {
-    if (!this._entry?.code) {
-      this._disassemblyNode.innerText = '';
-      return;
-    }
-    const rawCode = this._entry?.code;
+    this._disassemblyNode.innerText = '';
+    if (!this._entry?.code) return;
     try {
-      this._disassemblyNode.innerText = rawCode;
-      let formattedCode = this._disassemblyNode.innerHTML;
-      for (let register of kRegisters) {
-        const button = `<span class="register ${register}">${register}</span>`
-        formattedCode = formattedCode.replaceAll(register, button);
-      }
-      // Let's replace the base-address since it doesn't add any value.
-      // TODO
-      this._disassemblyNode.innerHTML = formattedCode;
+      this._disassemblyNode.appendChild(
+          new AssemblyFormatter(this._entry).fragment);
     } catch (e) {
       console.error(e);
-      this._disassemblyNode.innerText = rawCode;
+      this._disassemblyNode.innerText = this._entry.code;
     }
   }
 
@@ -135,34 +132,133 @@ DOM.defineCustomElement('view/code-panel',
   }
 });
 
-class RegisterSelector {
-  _currentRegister;
+class AssemblyFormatter {
+  constructor(codeLogEntry) {
+    this._fragment = new DocumentFragment();
+    this._entry = codeLogEntry;
+    codeLogEntry.code.split('\n').forEach(line => this._addLine(line));
+  }
+
+  get fragment() {
+    return this._fragment;
+  }
+
+  _addLine(line) {
+    const parts = line.split(' ');
+    let lineAddress = 0;
+    if (kFullAddressRegexp.test(parts[0])) {
+      lineAddress = parseInt(parts[0]);
+    }
+    const content = DOM.span({textContent: parts.join(' ') + '\n'});
+    let formattedCode = content.innerHTML.split(kRegisterRegexpSplit)
+                            .map(part => this._formatRegisterPart(part))
+                            .join('');
+    formattedCode = formattedCode.split(kAnyAddressRegexp)
+                        .map(
+                            (part, index) => this._formatAddressPart(
+                                part, index, lineAddress))
+                        .join('');
+    // Let's replace the base-address since it doesn't add any value.
+    // TODO
+    content.innerHTML = formattedCode;
+    this._fragment.appendChild(content);
+  }
+
+  _formatRegisterPart(part) {
+    if (!kIsRegisterRegexp.test(part)) return part;
+    return `<span class="reg ${part}">${part}</span>`
+  }
+
+  _formatAddressPart(part, index, lineAddress) {
+    if (kFullAddressRegexp.test(part)) {
+      // The first or second address must be the line address
+      if (index <= 1) {
+        return `<span class="addr line" data-addr="${part}">${part}</span>`;
+      }
+      return `<span class=addr data-addr="${part}">${part}</span>`;
+    } else if (kRelativeAddressRegexp.test(part)) {
+      const targetAddress = (lineAddress + parseInt(part)).toString(16);
+      return `<span class=addr data-addr="0x${targetAddress}">${part}</span>`;
+    } else {
+      return part;
+    }
+  }
+}
+
+class SelectionHandler {
+  _currentRegisterHovered;
+  _currentRegisterClicked;
+
   constructor(node) {
     this._node = node;
-    this._node.onmousemove = this._handleDisassemblyMouseMove.bind(this);
+    this._node.onmousemove = this._handleMouseMove.bind(this);
+    this._node.onclick = this._handleClick.bind(this);
+  }
+
+  $(query) {
+    return this._node.querySelectorAll(query);
+  }
+
+  _handleClick(event) {
+    const target = event.target;
+    if (target.classList.contains('addr')) {
+      return this._handleClickAddress(target);
+    } else if (target.classList.contains('reg')) {
+      this._handleClickRegister(target);
+    } else {
+      this._clearRegisterSelection();
+    }
+  }
+
+  _handleClickAddress(target) {
+    let targetAddress = target.getAttribute('data-addr') ?? target.innerText;
+    // Clear any selection
+    for (let addrNode of this.$('.addr.selected')) {
+      addrNode.classList.remove('selected');
+    }
+    // Highlight all matching addresses
+    let lineAddrNode;
+    for (let addrNode of this.$(`.addr[data-addr="${targetAddress}"]`)) {
+      addrNode.classList.add('selected');
+      if (addrNode.classList.contains('line') && lineAddrNode == undefined) {
+        lineAddrNode = addrNode;
+      }
+    }
+    // Jump to potential target address.
+    if (lineAddrNode) {
+      lineAddrNode.scrollIntoView({behavior: 'smooth', block: 'nearest'});
+    }
   }
 
-  _handleDisassemblyMouseMove(event) {
+  _handleClickRegister(target) {
+    this._setRegisterSelection(target.innerText);
+    this._currentRegisterClicked = this._currentRegisterHovered;
+  }
+
+  _handleMouseMove(event) {
+    if (this._currentRegisterClicked) return;
     const target = event.target;
-    if (!target.classList.contains('register')) {
-      this._clear();
-      return;
-    };
-    this._select(target.innerText);
+    if (!target.classList.contains('reg')) {
+      this._clearRegisterSelection();
+    } else {
+      this._setRegisterSelection(target.innerText);
+    }
   }
 
-  _clear() {
-    if (this._currentRegister == undefined) return;
-    for (let node of this._node.querySelectorAll('.register')) {
+  _clearRegisterSelection() {
+    if (!this._currentRegisterHovered) return;
+    for (let node of this.$('.reg.selected')) {
       node.classList.remove('selected');
     }
+    this._currentRegisterClicked = undefined;
+    this._currentRegisterHovered = undefined;
   }
 
-  _select(register) {
-    if (register == this._currentRegister) return;
-    this._clear();
-    this._currentRegister = register;
-    for (let node of this._node.querySelectorAll(`.register.${register}`)) {
+  _setRegisterSelection(register) {
+    if (register == this._currentRegisterHovered) return;
+    this._clearRegisterSelection();
+    this._currentRegisterHovered = register;
+    for (let node of this.$(`.reg.${register}`)) {
       node.classList.add('selected');
     }
   }

tools/system-analyzer/view/helper.mjs

@@ -171,7 +171,6 @@ export class CollapsableElement extends V8CustomElement {
       this._closer.checked = true;
       this._requestUpdateIfVisible();
     }
-    this.scrollIntoView();
   }
 
   show() {
@@ -179,7 +178,7 @@ export class CollapsableElement extends V8CustomElement {
       this._closer.checked = false;
       this._requestUpdateIfVisible();
     }
-    this.scrollIntoView();
+    this.scrollIntoView({behavior: 'smooth', block: 'center'});
   }
 
   requestUpdate(useAnimation = false) {
@@ -320,4 +319,4 @@ export function gradientStopsFromGroups(
 }
 
 export * from '../helper.mjs';
-export * from '../../js/web-api-helper.mjs'
\ No newline at end of file
+export * from '../../js/web-api-helper.mjs'

tools/system-analyzer/view/property-link-table.mjs

@@ -3,124 +3,135 @@
 // found in the LICENSE file.
 
 import {App} from '../index.mjs'
-import {FocusEvent} from './events.mjs';
+import {FocusEvent, SelectRelatedEvent} from './events.mjs';
 import {DOM, ExpandableText, V8CustomElement} from './helper.mjs';
 
-DOM.defineCustomElement(
-    'view/property-link-table',
-    template => class PropertyLinkTable extends V8CustomElement {
-      _instance;
-      _propertyDict;
-      _instanceLinkButtons = false;
-      _logEntryClickHandler = this._handleLogEntryClick.bind(this);
-      _logEntryRelatedHandler = this._handleLogEntryRelated.bind(this);
-      _arrayValueSelectHandler = this._handleArrayValueSelect.bind(this);
-
-      constructor() {
-        super(template);
-      }
-
-      set instanceLinkButtons(newValue) {
-        this._instanceLinkButtons = newValue;
-      }
-
-      set propertyDict(propertyDict) {
-        if (this._propertyDict === propertyDict) return;
-        if (typeof propertyDict !== 'object') {
-          throw new Error(
-              `Invalid property dict, expected object: ${propertyDict}`);
-        }
-        this._propertyDict = propertyDict;
-        this.requestUpdate();
-      }
-
-      _update() {
-        this._fragment = new DocumentFragment();
-        this._table = DOM.table('properties');
-        for (let key in this._propertyDict) {
-          const value = this._propertyDict[key];
-          this._addKeyValue(key, value);
-        }
-        this._addFooter();
-        this._fragment.appendChild(this._table);
-
-        const newContent = DOM.div();
-        newContent.appendChild(this._fragment);
-        this.$('#content').replaceWith(newContent);
-        newContent.id = 'content';
-        this._fragment = undefined;
-      }
-
-      _addKeyValue(key, value) {
-        if (key == 'title') {
-          this._addTitle(value);
-          return;
-        }
-        if (key == '__this__') {
-          this._instance = value;
-          return;
-        }
-        const row = this._table.insertRow();
-        row.insertCell().innerText = key;
-        const cell = row.insertCell();
-        if (value == undefined) return;
-        if (Array.isArray(value)) {
-          cell.appendChild(this._addArrayValue(value));
-          return;
-        }
-        if (App.isClickable(value)) {
-          cell.className = 'clickable';
-          cell.onclick = this._logEntryClickHandler;
-          cell.data = value;
-        }
-        new ExpandableText(cell, value.toString());
-      }
-
-      _addArrayValue(array) {
-        if (array.length == 0) {
-          return DOM.text('empty');
-        } else if (array.length > 200) {
-          return DOM.text(`${array.length} items`);
-        }
-        const select = DOM.element('select');
-        select.onchange = this._arrayValueSelectHandler;
-        for (let value of array) {
-          const option = DOM.element('option');
-          option.innerText = value.toString();
-          option.data = value;
-          select.add(option);
-        }
-        return select;
-      }
-
-      _addTitle(value) {
-        const title = DOM.element('h3');
-        title.innerText = value;
-        this._fragment.appendChild(title);
-      }
-
-      _addFooter() {
-        if (this._instance === undefined) return;
-        if (!this._instanceLinkButtons) return;
-        const td = this._table.createTFoot().insertRow().insertCell();
-        td.colSpan = 2;
-        let showButton =
-            td.appendChild(DOM.button('Show', this._logEntryClickHandler));
-        showButton.data = this._instance;
-        let showRelatedButton = td.appendChild(
-            DOM.button('Show Related', this._logEntryRelatedClickHandler));
-        showRelatedButton.data = this._instance;
-      }
-
-      _handleArrayValueSelect(event) {
-        const logEntry = event.currentTarget.selectedOptions[0].data;
-        this.dispatchEvent(new FocusEvent(logEntry));
-      }
-      _handleLogEntryClick(event) {
-        this.dispatchEvent(new FocusEvent(event.currentTarget.data));
-      }
-
-      _handleLogEntryRelated(event) {
-        this.dispatchEvent(new SelectRelatedEvent(event.currentTarget.data));
-      }
-    });
+DOM.defineCustomElement('view/property-link-table',
+                        template =>
+                            class PropertyLinkTable extends V8CustomElement {
+  _object;
+  _propertyDict;
+  _instanceLinkButtons = false;
+
+  _showHandler = this._handleShow.bind(this);
+  _showSourcePositionHandler = this._handleShowSourcePosition.bind(this);
+  _showRelatedHandler = this._handleShowRelated.bind(this);
+  _arrayValueSelectHandler = this._handleArrayValueSelect.bind(this);
+
+  constructor() {
+    super(template);
+  }
+
+  set instanceLinkButtons(newValue) {
+    this._instanceLinkButtons = newValue;
+  }
+
+  set propertyDict(propertyDict) {
+    if (this._propertyDict === propertyDict) return;
+    if (typeof propertyDict !== 'object') {
+      throw new Error(
+          `Invalid property dict, expected object: ${propertyDict}`);
+    }
+    this._propertyDict = propertyDict;
+    this.requestUpdate();
+  }
+
+  _update() {
+    this._fragment = new DocumentFragment();
+    this._table = DOM.table('properties');
+    for (let key in this._propertyDict) {
+      const value = this._propertyDict[key];
+      this._addKeyValue(key, value);
+    }
+    this._addFooter();
+    this._fragment.appendChild(this._table);
+
+    const newContent = DOM.div();
+    newContent.appendChild(this._fragment);
+    this.$('#content').replaceWith(newContent);
+    newContent.id = 'content';
+    this._fragment = undefined;
+  }
+
+  _addKeyValue(key, value) {
+    if (key == 'title') {
+      this._addTitle(value);
+      return;
+    }
+    if (key == '__this__') {
+      this._object = value;
+      return;
+    }
+    const row = this._table.insertRow();
+    row.insertCell().innerText = key;
+    const cell = row.insertCell();
+    if (value == undefined) return;
+    if (Array.isArray(value)) {
+      cell.appendChild(this._addArrayValue(value));
+      return;
+    }
+    if (App.isClickable(value)) {
+      cell.className = 'clickable';
+      cell.onclick = this._showHandler;
+      cell.data = value;
+    }
+    new ExpandableText(cell, value.toString());
+  }
+
+  _addArrayValue(array) {
+    if (array.length == 0) {
+      return DOM.text('empty');
+    } else if (array.length > 200) {
+      return DOM.text(`${array.length} items`);
+    }
+    const select = DOM.element('select');
+    select.onchange = this._arrayValueSelectHandler;
+    for (let value of array) {
+      const option = DOM.element('option');
+      option.innerText = value === undefined ? '' : value.toString();
+      option.data = value;
+      select.add(option);
+    }
+    return select;
+  }
+
+  _addTitle(value) {
+    const title = DOM.element('h3');
+    title.innerText = value;
+    this._fragment.appendChild(title);
+  }
+
+  _addFooter() {
+    if (this._object === undefined) return;
+    if (!this._instanceLinkButtons) return;
+    const td = this._table.createTFoot().insertRow().insertCell();
+    td.colSpan = 2;
+    let showButton = td.appendChild(DOM.button('Show', this._showHandler));
+    showButton.data = this._object;
+    if (this._object.sourcePosition) {
+      let showSourcePositionButton = td.appendChild(
+          DOM.button('Source Position', this._showSourcePositionHandler));
+      showSourcePositionButton.data = this._object;
+    }
+    let showRelatedButton =
+        td.appendChild(DOM.button('Show Related', this._showRelatedHandler));
+    showRelatedButton.data = this._object;
+  }
+
+  _handleArrayValueSelect(event) {
+    const logEntry = event.currentTarget.selectedOptions[0].data;
+    this.dispatchEvent(new FocusEvent(logEntry));
+  }
+
+  _handleShow(event) {
+    this.dispatchEvent(new FocusEvent(event.currentTarget.data));
+  }
+
+  _handleShowSourcePosition(event) {
+    this.dispatchEvent(new FocusEvent(event.currentTarget.data.sourcePosition));
+  }
+
+  _handleShowRelated(event) {
+    this.dispatchEvent(new SelectRelatedEvent(event.currentTarget.data));
+  }
+});

tools/system-analyzer/view/script-panel.mjs

 // Copyright 2020 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-import {defer, groupBy} from '../helper.mjs';
+import {arrayEquals, defer, groupBy} from '../helper.mjs';
 import {App} from '../index.mjs'
 
-import {SelectRelatedEvent, ToolTipEvent} from './events.mjs';
-import {CollapsableElement, CSSColor, delay, DOM, formatBytes, gradientStopsFromGroups} from './helper.mjs';
+import {SelectionEvent, SelectRelatedEvent, ToolTipEvent} from './events.mjs';
+import {CollapsableElement, CSSColor, delay, DOM, formatBytes, gradientStopsFromGroups, LazyTable} from './helper.mjs';
 
 // A source mapping proxy for source maps that don't have CORS headers.
 // TODO(leszeks): Make this configurable.
@@ -19,6 +19,8 @@ DOM.defineCustomElement('view/script-panel',
   _scripts = [];
   _script;
 
+  showToolTipEntriesHandler = this.handleShowToolTipEntries.bind(this);
+
   constructor() {
     super(templateText);
     this.scriptDropdown.addEventListener(
@@ -40,6 +42,8 @@ DOM.defineCustomElement('view/script-panel',
     this._script = script;
     script.ensureSourceMapCalculated(sourceMapFetchPrefix);
     this._sourcePositionsToMarkNodesPromise = defer();
+    this._selectedSourcePositions =
+        this._selectedSourcePositions.filter(each => each.script === script);
     this.requestUpdate();
   }
 
@@ -48,10 +52,14 @@ DOM.defineCustomElement('view/script-panel',
   }
 
   set selectedSourcePositions(sourcePositions) {
-    this._selectedSourcePositions = sourcePositions;
-    // TODO: highlight multiple scripts
-    this.script = sourcePositions[0]?.script;
-    this._focusSelectedMarkers();
+    if (arrayEquals(this._selectedSourcePositions, sourcePositions)) {
+      this._focusSelectedMarkers(0);
+    } else {
+      this._selectedSourcePositions = sourcePositions;
+      // TODO: highlight multiple scripts
+      this.script = sourcePositions[0]?.script;
+      this._focusSelectedMarkers(100);
+    }
   }
 
   set scripts(scripts) {
@@ -106,8 +114,8 @@ DOM.defineCustomElement('view/script-panel',
     this.script.replaceChild(scriptNode, oldScriptNode);
   }
 
-  async _focusSelectedMarkers() {
-    await delay(100);
+  async _focusSelectedMarkers(delay_ms) {
+    if (delay_ms) await delay(delay_ms);
     const sourcePositionsToMarkNodes =
         await this._sourcePositionsToMarkNodesPromise;
     // Remove all marked nodes.
@@ -127,7 +135,7 @@ DOM.defineCustomElement('view/script-panel',
     if (!sourcePosition) return;
     const markNode = sourcePositionsToMarkNodes.get(sourcePosition);
     markNode.scrollIntoView(
-        {behavior: 'auto', block: 'center', inline: 'center'});
+        {behavior: 'smooth', block: 'center', inline: 'center'});
   }
 
   _handleSelectScript(e) {
@@ -141,25 +149,23 @@ DOM.defineCustomElement('view/script-panel',
     this.dispatchEvent(new SelectRelatedEvent(this._script));
   }
 
+  setSelectedSourcePositionInternal(sourcePosition) {
+    this._selectedSourcePositions = [sourcePosition];
+    console.assert(sourcePosition.script === this._script);
+  }
+
   handleSourcePositionClick(e) {
     const sourcePosition = e.target.sourcePosition;
+    this.setSelectedSourcePositionInternal(sourcePosition);
     this.dispatchEvent(new SelectRelatedEvent(sourcePosition));
   }
 
   handleSourcePositionMouseOver(e) {
     const sourcePosition = e.target.sourcePosition;
     const entries = sourcePosition.entries;
-    let text = groupBy(entries, each => each.constructor, true)
-                   .map(group => {
-                     let text = `${group.key.name}: ${group.length}\n`
-                     text += groupBy(group.entries, each => each.type, true)
-                                 .map(group => {
-                                   return `  - ${group.key}: ${group.length}`;
-                                 })
-                                 .join('\n');
-                     return text;
-                   })
-                   .join('\n');
+    const toolTipContent = DOM.div();
+    toolTipContent.appendChild(
+        new ToolTipTableBuilder(this, entries).tableNode);
 
     let sourceMapContent;
     switch (this._script.sourceMapState) {
@@ -192,17 +198,50 @@ DOM.defineCustomElement('view/script-panel',
       default:
         break;
     }
-
-    const toolTipContent = DOM.div({
-      children: [
-        DOM.element('pre', {className: 'textContent', textContent: text}),
-        sourceMapContent
-      ]
-    });
+    toolTipContent.appendChild(sourceMapContent);
     this.dispatchEvent(new ToolTipEvent(toolTipContent, e.target));
   }
+
+  handleShowToolTipEntries(event) {
+    let entries = event.currentTarget.data;
+    const sourcePosition = entries[0].sourcePosition;
+    // Add a source position entry so the current position stays focused.
+    this.setSelectedSourcePositionInternal(sourcePosition);
+    entries = entries.concat(this._selectedSourcePositions);
+    this.dispatchEvent(new SelectionEvent(entries));
+  }
 });
 
+class ToolTipTableBuilder {
+  constructor(scriptPanel, entries) {
+    this._scriptPanel = scriptPanel;
+    this.tableNode = DOM.table();
+    const tr = DOM.tr();
+    tr.appendChild(DOM.td('Type'));
+    tr.appendChild(DOM.td('Subtype'));
+    tr.appendChild(DOM.td('Count'));
+    this.tableNode.appendChild(document.createElement('thead')).appendChild(tr);
+    groupBy(entries, each => each.constructor, true).forEach(group => {
+      this.addRow(group.key.name, 'all', entries, false)
+      groupBy(group.entries, each => each.type, true).forEach(group => {
+        this.addRow('', group.key, group.entries, false)
+      })
+    })
+  }
+
+  addRow(name, subtypeName, entries) {
+    const tr = DOM.tr();
+    tr.appendChild(DOM.td(name));
+    tr.appendChild(DOM.td(subtypeName));
+    tr.appendChild(DOM.td(entries.length));
+    const button =
+        DOM.button('Show', this._scriptPanel.showToolTipEntriesHandler);
+    button.data = entries;
+    tr.appendChild(DOM.td(button));
+    this.tableNode.appendChild(tr);
+  }
+}
+
 class SourcePositionIterator {
   _entries;
   _index = 0;

tools/system-analyzer/view/timeline/timeline-track-base.mjs

@@ -27,7 +27,6 @@ export class TimelineTrackBase extends V8CustomElement {
     super(templateText);
     this._selectionHandler = new SelectionHandler(this);
     this._legend = new Legend(this.$('#legendTable'));
-    this._legend.onFilter = (type) => this._handleFilterTimeline();
 
     this.timelineChunks = this.$('#timelineChunks');
     this.timelineSamples = this.$('#timelineSamples');
@@ -37,14 +36,17 @@ export class TimelineTrackBase extends V8CustomElement {
     this.timelineAnnotationsNode = this.$('#timelineAnnotations');
     this.timelineMarkersNode = this.$('#timelineMarkers');
     this._scalableContentNode = this.$('#scalableContent');
+    this.isLocked = false;
+  }
 
+  _initEventListeners() {
+    this._legend.onFilter = (type) => this._handleFilterTimeline();
     this.timelineNode.addEventListener(
         'scroll', e => this._handleTimelineScroll(e));
     this.hitPanelNode.onclick = this._handleClick.bind(this);
     this.hitPanelNode.ondblclick = this._handleDoubleClick.bind(this);
     this.hitPanelNode.onmousemove = this._handleMouseMove.bind(this);
     window.addEventListener('resize', () => this._resetCachedDimensions());
-    this.isLocked = false;
   }
 
   static get observedAttributes() {
@@ -62,6 +64,8 @@ export class TimelineTrackBase extends V8CustomElement {
   }
 
   set data(timeline) {
+    console.assert(timeline);
+    if (!this._timeline) this._initEventListeners();
     this._timeline = timeline;
     this._legend.timeline = timeline;
     this.$('.content').style.display = timeline.isEmpty() ? 'none' : 'relative';
@@ -136,6 +140,11 @@ export class TimelineTrackBase extends V8CustomElement {
   }
 
   get chunks() {
+    if (this._chunks?.length != this.nofChunks) {
+      this._chunks =
+          this._timeline.chunks(this.nofChunks, this._legend.filterPredicate);
+      console.assert(this._chunks.length == this._nofChunks);
+    }
     return this._chunks;
   }
 
@@ -209,19 +218,13 @@ export class TimelineTrackBase extends V8CustomElement {
 
   _update() {
     this._legend.update();
-    this._drawContent();
-    this._drawAnnotations(this.selectedEntry);
+    this._drawContent().then(() => this._drawAnnotations(this.selectedEntry));
     this._resetCachedDimensions();
   }
 
   async _drawContent() {
-    await delay(5);
     if (this._timeline.isEmpty()) return;
-    if (this.chunks?.length != this.nofChunks) {
-      this._chunks =
-          this._timeline.chunks(this.nofChunks, this._legend.filterPredicate);
-      console.assert(this._chunks.length == this._nofChunks);
-    }
+    await delay(5);
     const chunks = this.chunks;
     const max = chunks.max(each => each.size());
     let buffer = '';
@@ -558,12 +561,13 @@ class Legend {
           tbody.appendChild(this._addTypeRow(group));
           missingTypes.delete(group.key);
         });
-    missingTypes.forEach(key => tbody.appendChild(this._row('', key, 0, '0%')));
+    missingTypes.forEach(
+        key => tbody.appendChild(this._addRow('', key, 0, '0%')));
     if (this._timeline.selection) {
       tbody.appendChild(
-          this._row('', 'Selection', this.selection.length, '100%'));
+          this._addRow('', 'Selection', this.selection.length, '100%'));
     }
-    tbody.appendChild(this._row('', 'All', this._timeline.length, ''));
+    tbody.appendChild(this._addRow('', 'All', this._timeline.length, ''));
     this._table.tBodies[0].replaceWith(tbody);
   }
 
@@ -572,11 +576,10 @@ class Legend {
     const example = this.selection.at(0);
     if (!example || !('duration' in example)) return;
     this._enableDuration = true;
-    this._table.tHead.appendChild(DOM.td('Duration'));
-    this._table.tHead.appendChild(DOM.td(''));
+    this._table.tHead.rows[0].appendChild(DOM.td('Duration'));
   }
 
-  _row(colorNode, type, count, countPercent, duration, durationPercent) {
+  _addRow(colorNode, type, count, countPercent, duration, durationPercent) {
     const row = DOM.tr();
     row.appendChild(DOM.td(colorNode));
     const typeCell = row.appendChild(DOM.td(type));
@@ -608,7 +611,7 @@ class Legend {
     }
     let countPercent =
         `${(group.length / this.selection.length * 100).toFixed(1)}%`;
-    const row = this._row(
+    const row = this._addRow(
         colorDiv, group.key, group.length, countPercent, duration, '');
     row.className = 'clickable';
     row.onclick = this._typeClickHandler;

tools/system-analyzer/view/timeline/timeline-track-tick.mjs

@@ -6,7 +6,6 @@ import {delay} from '../../helper.mjs';
 import {TickLogEntry} from '../../log/tick.mjs';
 import {Timeline} from '../../timeline.mjs';
 import {DOM, SVG} from '../helper.mjs';
-
 import {TimelineTrackStackedBase} from './timeline-track-stacked-base.mjs'
 
 class Flame {
@@ -179,15 +178,15 @@ class Annotations {
     if (end > rawFlames.length) end = rawFlames.length;
     const logEntry = this._logEntry;
     // Also compare against the function, if any.
-    const func = logEntry.entry?.func;
+    const func = logEntry.entry?.func ?? -1;
     for (let i = start; i < end; i++) {
       const flame = rawFlames[i];
-      if (!flame.entry) continue;
-      if (flame.entry.logEntry !== logEntry &&
-          (!func || flame.entry.func !== func)) {
-        continue;
+      const flameLogEntry = flame.logEntry;
+      if (!flameLogEntry) continue;
+      if (flameLogEntry !== logEntry) {
+        if (flameLogEntry.entry?.func !== func) continue;
       }
-      this._buffer += this._track.drawFlame(flame, i, true);
+      this._buffer += this._track._drawItem(flame, i, true);
     }
   }
 
@@ -198,4 +197,4 @@ class Annotations {
     this._node.appendChild(svg);
     this._buffer = '';
   }
-}
\ No newline at end of file
+}

tools/tickprocessor.mjs

@@ -514,6 +514,7 @@ export class TickProcessor extends LogReader {
       timedRange,
       pairwiseTimedRange);
     this.dispatchTable_ = {
+      __proto__: null,
       'shared-library': {
         parsers: [parseString, parseInt, parseInt, parseInt],
         processor: this.processSharedLibrary
@@ -575,16 +576,16 @@ export class TickProcessor extends LogReader {
         processor: this.advanceDistortion
       },
       // Ignored events.
-      'profiler': null,
-      'function-creation': null,
-      'function-move': null,
-      'function-delete': null,
-      'heap-sample-item': null,
-      'current-time': null,  // Handled specially, not parsed.
+      'profiler': undefined,
+      'function-creation': undefined,
+      'function-move': undefined,
+      'function-delete': undefined,
+      'heap-sample-item': undefined,
+      'current-time': undefined,  // Handled specially, not parsed.
       // Obsolete row types.
-      'code-allocate': null,
-      'begin-code-region': null,
-      'end-code-region': null
+      'code-allocate': undefined,
+      'begin-code-region': undefined,
+      'end-code-region': undefined
     };
 
     this.preprocessJson = preprocessJson;