// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
base.require('importer.v8.splaytree');
/**
* @fileoverview Map addresses to dynamically created functions.
*/
base.exportTo('tracing.importer.v8', function() {
/**
* Constructs a mapper that maps addresses into code entries.
*
* @constructor
*/
function CodeMap() {
/**
* Dynamic code entries. Used for JIT compiled code.
*/
this.dynamics_ = new tracing.importer.v8.SplayTree();
/**
* Name generator for entries having duplicate names.
*/
this.dynamicsNameGen_ = new tracing.importer.v8.CodeMap.NameGenerator();
/**
* Static code entries. Used for statically compiled code.
*/
this.statics_ = new tracing.importer.v8.SplayTree();
/**
* Libraries entries. Used for the whole static code libraries.
*/
this.libraries_ = new tracing.importer.v8.SplayTree();
/**
* Map of memory pages occupied with static code.
*/
this.pages_ = [];
};
/**
* The number of alignment bits in a page address.
*/
CodeMap.PAGE_ALIGNMENT = 12;
/**
* Page size in bytes.
*/
CodeMap.PAGE_SIZE =
1 << CodeMap.PAGE_ALIGNMENT;
/**
* Adds a dynamic (i.e. moveable and discardable) code entry.
*
* @param {number} start The starting address.
* @param {CodeMap.CodeEntry} codeEntry Code entry object.
*/
CodeMap.prototype.addCode = function(start, codeEntry) {
this.deleteAllCoveredNodes_(this.dynamics_, start, start + codeEntry.size);
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.
*/
CodeMap.prototype.moveCode = function(from, to) {
var removedNode = this.dynamics_.remove(from);
this.deleteAllCoveredNodes_(this.dynamics_, to,
to + removedNode.value.size);
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.
*
* @param {number} start The starting address of the entry being deleted.
*/
CodeMap.prototype.deleteCode = function(start) {
var removedNode = this.dynamics_.remove(start);
};
/**
* Adds a library entry.
*
* @param {number} start The starting address.
* @param {CodeMap.CodeEntry} codeEntry Code entry object.
*/
CodeMap.prototype.addLibrary = function(
start, codeEntry) {
this.markPages_(start, start + codeEntry.size);
this.libraries_.insert(start, codeEntry);
};
/**
* Adds a static code entry.
*
* @param {number} start The starting address.
* @param {CodeMap.CodeEntry} codeEntry Code entry object.
*/
CodeMap.prototype.addStaticCode = function(
start, codeEntry) {
this.statics_.insert(start, codeEntry);
};
/**
* @private
*/
CodeMap.prototype.markPages_ = function(start, end) {
for (var addr = start; addr <= end;
addr += CodeMap.PAGE_SIZE) {
this.pages_[addr >>> CodeMap.PAGE_ALIGNMENT] = 1;
}
};
/**
* @private
*/
CodeMap.prototype.deleteAllCoveredNodes_ = function(tree, start, end) {
var to_delete = [];
var addr = end - 1;
while (addr >= start) {
var node = tree.findGreatestLessThan(addr);
if (!node) break;
var start2 = node.key, end2 = start2 + node.value.size;
if (start2 < end && start < end2) to_delete.push(start2);
addr = start2 - 1;
}
for (var i = 0, l = to_delete.length; i < l; ++i) tree.remove(to_delete[i]);
};
/**
* @private
*/
CodeMap.prototype.isAddressBelongsTo_ = function(addr, node) {
return addr >= node.key && addr < (node.key + node.value.size);
};
/**
* @private
*/
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.
*/
CodeMap.prototype.findEntry = function(addr) {
var pageAddr = addr >>> CodeMap.PAGE_ALIGNMENT;
if (pageAddr in this.pages_) {
// Static code entries can contain "holes" of unnamed code.
// In this case, the whole library is assigned to this address.
return this.findInTree_(this.statics_, addr) ||
this.findInTree_(this.libraries_, addr);
}
var min = this.dynamics_.findMin();
var max = this.dynamics_.findMax();
if (max != null && addr < (max.key + max.value.size) && addr >= min.key) {
var dynaEntry = this.findInTree_(this.dynamics_, addr);
if (dynaEntry == null) return null;
// Dedupe entry name.
if (!dynaEntry.nameUpdated_) {
dynaEntry.name = this.dynamicsNameGen_.getName(dynaEntry.name);
dynaEntry.nameUpdated_ = true;
}
return dynaEntry;
}
return null;
};
/**
* Returns a dynamic code entry using its starting address.
*
* @param {number} addr Address.
*/
CodeMap.prototype.findDynamicEntryByStartAddress =
function(addr) {
var node = this.dynamics_.find(addr);
return node ? node.value : null;
};
/**
* Returns an array of all dynamic code entries.
*/
CodeMap.prototype.getAllDynamicEntries = function() {
return this.dynamics_.exportValues();
};
/**
* Returns an array of pairs of all dynamic code entries and their addresses.
*/
CodeMap.prototype.getAllDynamicEntriesWithAddresses = function() {
return this.dynamics_.exportKeysAndValues();
};
/**
* Returns an array of all static code entries.
*/
CodeMap.prototype.getAllStaticEntries = function() {
return this.statics_.exportValues();
};
/**
* Returns an array of all libraries entries.
*/
CodeMap.prototype.getAllLibrariesEntries = function() {
return this.libraries_.exportValues();
};
/**
* Creates a code entry object.
*
* @param {number} size Code entry size in bytes.
* @param {string} opt_name Code entry name.
* @constructor
*/
CodeMap.CodeEntry = function(size, opt_name) {
this.size = size;
this.name = opt_name || '';
this.nameUpdated_ = false;
};
CodeMap.CodeEntry.prototype.getName = function() {
return this.name;
};
CodeMap.CodeEntry.prototype.toString = function() {
return this.name + ': ' + this.size.toString(16);
};
CodeMap.NameGenerator = function() {
this.knownNames_ = {};
};
CodeMap.NameGenerator.prototype.getName = function(name) {
if (!(name in this.knownNames_)) {
this.knownNames_[name] = 0;
return name;
}
var count = ++this.knownNames_[name];
return name + ' {' + count + '}';
};
return {
CodeMap: CodeMap
};
});