Reimplement (address -> code) mapping from tickprocessor.py in JS.

tools/codemap.js

Index: tools/codemap.js
diff --git a/tools/codemap.js b/tools/codemap.js
new file mode 100644
index 0000000000000000000000000000000000000000..f91d5254c18672cbf3e469c9b4c1d4f0bf8e39fe
--- /dev/null
+++ b/tools/codemap.js
@@ -0,0 +1,205 @@
+// Copyright 2009 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+// Initlialize namespaces
+var devtools = devtools || {};
+devtools.profiler = devtools.profiler || {};
+
+
+/**
+ * Constructs a mapper that maps addresses into code entries.
+ *
+ * @constructor
+ */
+devtools.profiler.CodeMap = function() {
+  /**
+   * Dynamic code entries. Used for JIT compiled code.
+   */
+  this.dynamics_ = new goog.structs.SplayTree();
+
+  /**
+   * Deleted code entries. Used for code collected by the GC.
+   */
+  this.deleted_ = [];
+
+  /**
+   * Static code entries. Used for libraries code.
+   */
+  this.statics_ = new goog.structs.SplayTree();
+
+  /**
+   * Map of memory pages occupied with static code.
+   */
+  this.pages_ = [];
+};
+
+
+/**
+ * The number of alignment bits in a page address.
+ */
+devtools.profiler.CodeMap.PAGE_ALIGNMENT = 12;
+
+
+/**
+ * Page size in bytes.
+ */
+devtools.profiler.CodeMap.PAGE_SIZE =
+    1 << devtools.profiler.CodeMap.PAGE_ALIGNMENT;
+
+
+/**
+ * Adds a dynamic (i.e. moveable and discardable) code entry.
+ *
+ * @param {number} start The starting address.
+ * @param {devtools.profiler.CodeMap.CodeEntry} codeEntry Code entry object.
+ */
+devtools.profiler.CodeMap.prototype.addCode = function(start, codeEntry) {
+  this.dynamics_.insert(start, codeEntry);
+};
+
+
+/**
+ * Moves a dynamic code entry. Throws an exception if there is no dynamic
+ * code entry with the specified starting address.
+ *
+ * @param {number} from The starting address of the entry being moved.
+ * @param {number} to The destination address.
+ */
+devtools.profiler.CodeMap.prototype.moveCode = function(from, to) {
+  var removedNode = this.dynamics_.remove(from);
+  this.dynamics_.insert(to, removedNode.value);
+};
+
+
+/**
+ * Discards a dynamic code entry. Throws an exception if there is no dynamic
+ * code entry with the specified starting address. The entry will still be
+ * returned from the 'getAllDynamicEntries' method.
+ *
+ * @param {number} start The starting address of the entry being deleted.
+ */
+devtools.profiler.CodeMap.prototype.deleteCode = function(start) {
+  var removedNode = this.dynamics_.remove(start);
+  this.deleted_.push(removedNode.value);
+};
+
+
+/**
+ * Adds a static code entry.
+ *
+ * @param {number} start The starting address.
+ * @param {devtools.profiler.CodeMap.CodeEntry} codeEntry Code entry object.
+ */
+devtools.profiler.CodeMap.prototype.addStaticCode = function(
+    start, codeEntry) {
+  this.markPages_(start, start + codeEntry.size);
+  this.statics_.insert(start, codeEntry);
+};
+
+
+/**
+ * @private
+ */
+devtools.profiler.CodeMap.prototype.markPages_ = function(start, end) {
+  for (var addr = start; addr <= end;
+       addr += devtools.profiler.CodeMap.PAGE_SIZE) {
+    this.pages_[addr >> devtools.profiler.CodeMap.PAGE_ALIGNMENT] = 1;
+  }
+};
+
+
+/**
+ * @private
+ */
+devtools.profiler.CodeMap.prototype.isAddressBelongsTo_ = function(addr, node) {
+  return addr >= node.key && addr < (node.key + node.value.size);
+};
+
+
+/**
+ * @private
+ */
+devtools.profiler.CodeMap.prototype.findInTree_ = function(tree, addr) {
+  var node = tree.findGreatestLessThan(addr);
+  return node && this.isAddressBelongsTo_(addr, node) ? node.value : null;
+};
+
+
+/**
+ * Finds a code entry that contains the specified address. Both static and
+ * dynamic code entries are considered.
+ *
+ * @param {number} addr Address.
+ */
+devtools.profiler.CodeMap.prototype.findEntry = function(addr) {
+  var pageAddr = addr >> devtools.profiler.CodeMap.PAGE_ALIGNMENT;
+  if (pageAddr in this.pages_) {
+    return this.findInTree_(this.statics_, addr);
+  }
+  var min = this.dynamics_.findMin();
+  var max = this.dynamics_.findMax();
+  if (max != null && addr < (max.key + max.value.size) && addr >= min.key) {
+    return this.findInTree_(this.dynamics_, addr);
+  }
+  return null;
+};
+
+
+/**
+ * Returns an array of all dynamic code entries, including deleted ones.
+ */
+devtools.profiler.CodeMap.prototype.getAllDynamicEntries = function() {
+  var dynamicEntries = this.dynamics_.exportValues();
+  return dynamicEntries.concat(this.deleted_);
+};
+
+
+/**
+ * Returns an array of all static code entries.
+ */
+devtools.profiler.CodeMap.prototype.getAllStaticEntries = function() {
+  return this.statics_.exportValues();
+};
+
+
+/**
+ * Creates a code entry object.
+ *
+ * @param {number} size Code entry size in bytes.
+ * @param {string} opt_name Code entry name.
+ * @constructor
+ */
+devtools.profiler.CodeMap.CodeEntry = function(size, opt_name) {
+  this.size = size;
+  this.name = opt_name || '';
+};
+
+
+devtools.profiler.CodeMap.CodeEntry.prototype.toString = function() {
+  return this.name + ': ' + this.size.toString(16);
+};