Add Function based profile tree

runtime/observatory/lib/src/cpu_profile/cpu_profile.dart

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+part of cpu_profiler;
+
+class CodeTrieNode {
+  final ProfileCode profileCode;
+  final int count;
+  final children = new List<CodeTrieNode>();
+  CodeTrieNode(this.profileCode, this.count);
+}
+
+class FunctionTrieNode {
+  final ProfileFunction profileFunction;
+  final int count;
+  final children = new List<FunctionTrieNode>();
+  FunctionTrieNode(this.profileFunction, this.count);
+}
+
+class CodeTick {
+  final int address;
+  final int exclusiveTicks;
+  final int inclusiveTicks;
+  CodeTick(this.address, this.exclusiveTicks, this.inclusiveTicks);
+}
+
+class ProfileCode {
+  final CpuProfile profile;
+  final Code code;
+  int exclusiveTicks;
+  int inclusiveTicks;
+  final addressTicks = new Map<int, CodeTick>();
+  String formattedInclusiveTicks = '';
+  String formattedExclusiveTicks = '';
+
+  void _processTicks(List<String> profileTicks) {
+    assert(profileTicks != null);
+    assert((profileTicks.length % 3) == 0);
+    for (var i = 0; i < profileTicks.length; i += 3) {
+      var address = int.parse(profileTicks[i], radix:16);
+      var exclusive = int.parse(profileTicks[i + 1]);
+      var inclusive = int.parse(profileTicks[i + 2]);
+      var tick = new CodeTick(address, exclusive, inclusive);
+      addressTicks[address] = tick;
+    }
+  }
+
+  ProfileCode.fromMap(this.profile, this.code, Map data) {
+    assert(profile != null);
+    assert(code != null);
+
+    code.profile = this;
+
+    inclusiveTicks = int.parse(data['inclusiveTicks']);
+    exclusiveTicks = int.parse(data['exclusiveTicks']);
+    var ticks = data['ticks'];
+    if (ticks != null) {
+      _processTicks(ticks);
+    }
+
+    formattedInclusiveTicks =
+      '${Utils.formatPercent(inclusiveTicks, profile.sampleCount)} '
+      '($inclusiveTicks)';
+
+    formattedExclusiveTicks =
+      '${Utils.formatPercent(exclusiveTicks, profile.sampleCount)} '
+      '($exclusiveTicks)';
+  }
+}
+
+class ProfileFunction {
+  final CpuProfile profile;
+  final ServiceFunction function;
+  // List of compiled code objects containing this function.
+  final List<ProfileCode> profileCodes = new List<ProfileCode>();
+
+  // Absolute ticks:
+  int exclusiveTicks = 0;
+  int inclusiveTicks = 0;
+  int exclusiveOptimizedTicks = 0;
+  int inclusiveOptimizedTicks = 0;
+
+  // Global percentages:
+  double globalExclusiveTicks = 0.0;
+  double globalInclusiveTicks = 0.0;
+  double globalExclusiveOptimizedTicks = 0.0;
+  double globalInclusiveOptimizedTicks = 0.0;
+
+  int _sortCodes(ProfileCode a, ProfileCode b) {
+    if (a.code.isOptimized == b.code.isOptimized) {
+      return 0;
+    }
+    if (a.code.isOptimized) {
+      return -1;
+    }
+    return 1;
+  }
+
+  ProfileFunction.fromMap(this.profile, this.function, Map data) {
+    for (var codeIndex in data['codes']) {
+      var profileCode = profile.codes[codeIndex];
+      profileCodes.add(profileCode);
+      exclusiveTicks += profileCode.exclusiveTicks;
+      inclusiveTicks += profileCode.inclusiveTicks;
+      if (profileCode.code.isOptimized) {
+        exclusiveOptimizedTicks += profileCode.exclusiveTicks;
+        inclusiveOptimizedTicks += profileCode.inclusiveTicks;
+      }
+    }
+
+    profileCodes.sort(_sortCodes);
+
+    globalExclusiveTicks = exclusiveTicks / profile.sampleCount;
+    globalInclusiveTicks = inclusiveTicks / profile.sampleCount;
+
+    globalExclusiveOptimizedTicks =
+        exclusiveOptimizedTicks / profile.sampleCount;
+    globalInclusiveOptimizedTicks =
+        inclusiveOptimizedTicks / profile.sampleCount;
+  }
+}
+
+
+class CpuProfile {
+  final double MICROSECONDS_PER_SECOND = 1000000.0;
+  final double displayThreshold = 0.0002; // 0.02%.
+
+  Isolate isolate;
+
+  int sampleCount = 0;
+  int samplePeriod = 0;
+  double sampleRate = 0.0;
+
+  int stackDepth = 0;
+
+  double timeSpan = 0.0;
+
+  CodeTrieNode codeTrieRoot;
+  FunctionTrieNode functionTrieRoot;
+
+  final List<ProfileCode> codes = new List<ProfileCode>();
+  final List<ProfileFunction> functions = new List<ProfileFunction>();
+
+  void clear() {
+    codeTrieRoot = null;
+    functionTrieRoot = null;
+    codes.clear();
+    functions.clear();
+  }
+
+  void load(Isolate isolate, ServiceMap profile) {
+    if ((isolate == null) || (profile == null)) {
+      return;
+    }
+
+    this.isolate = isolate;
+    isolate.resetCachedProfileData();
+
+    clear();
+
+    sampleCount = profile['sampleCount'];
+    samplePeriod = profile['samplePeriod'];
+    sampleRate = (MICROSECONDS_PER_SECOND / samplePeriod);
+    stackDepth = profile['stackDepth'];
+    timeSpan = profile['timeSpan'];
+
+    // Process code table.
+    for (var codeRegion in profile['codes']) {
+      Code code = codeRegion['code'];
+      assert(code != null);
+      codes.add(new ProfileCode.fromMap(this, code, codeRegion));
+    }
+
+    // Process function table.
+    for (var profileFunction in profile['functions']) {
+      ServiceFunction function = profileFunction['function'];
+      assert(function != null);
+      functions.add(
+          new ProfileFunction.fromMap(this, function, profileFunction));
+    }
+
+    // Process code trie.
+    var exclusiveCodeTrie = profile['exclusiveCodeTrie'];
+    assert(exclusiveCodeTrie != null);
+    codeTrieRoot = _processCodeTrie(exclusiveCodeTrie);
+
+    // Process function trie.
+    var exclusiveFunctionTrie = profile['exclusiveFunctionTrie'];
+    assert(exclusiveFunctionTrie != null);
+    functionTrieRoot = _processFunctionTrie(exclusiveFunctionTrie);
+  }
+
+  // Data shared across calls to _read*TrieNode.
+  int _trieDataCursor;
+  List<int> _trieData;
+
+  // The code trie is serialized as a list of integers. Each node
+  // is recreated by consuming some portion of the list. The format is as
+  // follows:
+  // [0] index into codeTable of code object.
+  // [1] tick count (number of times this stack frame occured).
+  // [2] child node count
+  // Reading the trie is done by recursively reading the tree depth-first
+  // pre-order.
+  CodeTrieNode _processCodeTrie(List<int> data) {
+    // Setup state shared across calls to _readTrieNode.
+    _trieDataCursor = 0;
+    _trieData = data;
+    if (_trieData == null) {
+      return null;
+    }
+    if (_trieData.length < 3) {
+      // Not enough integers for 1 node.
+      return null;
+    }
+    // Read the tree, returns the root node.
+    return _readCodeTrieNode();
+  }
+
+  CodeTrieNode _readCodeTrieNode() {
+    // Read index into code table.
+    var index = _trieData[_trieDataCursor++];
+    // Lookup code object.
+    var code = codes[index];
+    // Frame counter.
+    var count = _trieData[_trieDataCursor++];
+    // Create node.
+    var node = new CodeTrieNode(code, count);
+    // Number of children.
+    var children = _trieData[_trieDataCursor++];
+    // Recursively read child nodes.
+    for (var i = 0; i < children; i++) {
+      var child = _readCodeTrieNode();
+      node.children.add(child);
+    }
+    return node;
+  }
+
+  FunctionTrieNode _processFunctionTrie(List<int> data) {
+    // Setup state shared across calls to _readTrieNode.
+    _trieDataCursor = 0;
+    _trieData = data;
+    if (_trieData == null) {
+      return null;
+    }
+    if (_trieData.length < 3) {
+      // Not enough integers for 1 node.
+      return null;
+    }
+    // Read the tree, returns the root node.
+    return _readFunctionTrieNode();
+  }
+
+  FunctionTrieNode _readFunctionTrieNode() {
+    // Read index into function table.
+    var index = _trieData[_trieDataCursor++];
+    // Lookup function object.
+    var function = functions[index];
+    // Frame counter.
+    var count = _trieData[_trieDataCursor++];
+    // Create node.
+    var node = new FunctionTrieNode(function, count);
+    // Number of children.
+    var children = _trieData[_trieDataCursor++];
+    // Recursively read child nodes.
+    for (var i = 0; i < children; i++) {
+      var child = _readFunctionTrieNode();
+      node.children.add(child);
+    }
+    return node;
+  }
+
+  double approximateSecondsForCount(count) {
+    var MICROSECONDS_PER_SECOND = 1000000.0;
+    return (count * samplePeriod) / MICROSECONDS_PER_SECOND;
+  }
+}