deps/v8/tools/profile.js
// 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.
//
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
/**
* Creates a profile object for processing profiling-related events
* and calculating function execution times.
*
* @constructor
*/
function Profile() {
this.codeMap_ = new CodeMap();
this.topDownTree_ = new CallTree();
this.bottomUpTree_ = new CallTree();
};
/**
* Returns whether a function with the specified name must be skipped.
* Should be overriden by subclasses.
*
* @param {string} name Function name.
*/
Profile.prototype.skipThisFunction = function(name) {
return false;
};
/**
* Enum for profiler operations that involve looking up existing
* code entries.
*
* @enum {number}
*/
Profile.Operation = {
MOVE: 0,
DELETE: 1,
TICK: 2
};
/**
* Enum for code state regarding its dynamic optimization.
*
* @enum {number}
*/
Profile.CodeState = {
COMPILED: 0,
OPTIMIZABLE: 1,
OPTIMIZED: 2
};
/**
* Called whenever the specified operation has failed finding a function
* containing the specified address. Should be overriden by subclasses.
* See the Profile.Operation enum for the list of
* possible operations.
*
* @param {number} operation Operation.
* @param {number} addr Address of the unknown code.
* @param {number} opt_stackPos If an unknown address is encountered
* during stack strace processing, specifies a position of the frame
* containing the address.
*/
Profile.prototype.handleUnknownCode = function(
operation, addr, opt_stackPos) {
};
/**
* Registers a library.
*
* @param {string} name Code entry name.
* @param {number} startAddr Starting address.
* @param {number} endAddr Ending address.
*/
Profile.prototype.addLibrary = function(
name, startAddr, endAddr) {
var entry = new CodeMap.CodeEntry(
endAddr - startAddr, name);
this.codeMap_.addLibrary(startAddr, entry);
return entry;
};
/**
* Registers statically compiled code entry.
*
* @param {string} name Code entry name.
* @param {number} startAddr Starting address.
* @param {number} endAddr Ending address.
*/
Profile.prototype.addStaticCode = function(
name, startAddr, endAddr) {
var entry = new CodeMap.CodeEntry(
endAddr - startAddr, name);
this.codeMap_.addStaticCode(startAddr, entry);
return entry;
};
/**
* Registers dynamic (JIT-compiled) code entry.
*
* @param {string} type Code entry type.
* @param {string} name Code entry name.
* @param {number} start Starting address.
* @param {number} size Code entry size.
*/
Profile.prototype.addCode = function(
type, name, start, size) {
var entry = new Profile.DynamicCodeEntry(size, type, name);
this.codeMap_.addCode(start, entry);
return entry;
};
/**
* Registers dynamic (JIT-compiled) code entry.
*
* @param {string} type Code entry type.
* @param {string} name Code entry name.
* @param {number} start Starting address.
* @param {number} size Code entry size.
* @param {number} funcAddr Shared function object address.
* @param {Profile.CodeState} state Optimization state.
*/
Profile.prototype.addFuncCode = function(
type, name, start, size, funcAddr, state) {
// As code and functions are in the same address space,
// it is safe to put them in a single code map.
var func = this.codeMap_.findDynamicEntryByStartAddress(funcAddr);
if (!func) {
func = new Profile.FunctionEntry(name);
this.codeMap_.addCode(funcAddr, func);
} else if (func.name !== name) {
// Function object has been overwritten with a new one.
func.name = name;
}
var entry = this.codeMap_.findDynamicEntryByStartAddress(start);
if (entry) {
if (entry.size === size && entry.func === func) {
// Entry state has changed.
entry.state = state;
}
} else {
entry = new Profile.DynamicFuncCodeEntry(size, type, func, state);
this.codeMap_.addCode(start, entry);
}
return entry;
};
/**
* Reports about moving of a dynamic code entry.
*
* @param {number} from Current code entry address.
* @param {number} to New code entry address.
*/
Profile.prototype.moveCode = function(from, to) {
try {
this.codeMap_.moveCode(from, to);
} catch (e) {
this.handleUnknownCode(Profile.Operation.MOVE, from);
}
};
/**
* Reports about deletion of a dynamic code entry.
*
* @param {number} start Starting address.
*/
Profile.prototype.deleteCode = function(start) {
try {
this.codeMap_.deleteCode(start);
} catch (e) {
this.handleUnknownCode(Profile.Operation.DELETE, start);
}
};
/**
* Reports about moving of a dynamic code entry.
*
* @param {number} from Current code entry address.
* @param {number} to New code entry address.
*/
Profile.prototype.moveFunc = function(from, to) {
if (this.codeMap_.findDynamicEntryByStartAddress(from)) {
this.codeMap_.moveCode(from, to);
}
};
/**
* Retrieves a code entry by an address.
*
* @param {number} addr Entry address.
*/
Profile.prototype.findEntry = function(addr) {
return this.codeMap_.findEntry(addr);
};
/**
* Records a tick event. Stack must contain a sequence of
* addresses starting with the program counter value.
*
* @param {Array<number>} stack Stack sample.
*/
Profile.prototype.recordTick = function(stack) {
var processedStack = this.resolveAndFilterFuncs_(stack);
this.bottomUpTree_.addPath(processedStack);
processedStack.reverse();
this.topDownTree_.addPath(processedStack);
};
/**
* Translates addresses into function names and filters unneeded
* functions.
*
* @param {Array<number>} stack Stack sample.
*/
Profile.prototype.resolveAndFilterFuncs_ = function(stack) {
var result = [];
for (var i = 0; i < stack.length; ++i) {
var entry = this.codeMap_.findEntry(stack[i]);
if (entry) {
var name = entry.getName();
if (!this.skipThisFunction(name)) {
result.push(name);
}
} else {
this.handleUnknownCode(
Profile.Operation.TICK, stack[i], i);
}
}
return result;
};
/**
* Performs a BF traversal of the top down call graph.
*
* @param {function(CallTree.Node)} f Visitor function.
*/
Profile.prototype.traverseTopDownTree = function(f) {
this.topDownTree_.traverse(f);
};
/**
* Performs a BF traversal of the bottom up call graph.
*
* @param {function(CallTree.Node)} f Visitor function.
*/
Profile.prototype.traverseBottomUpTree = function(f) {
this.bottomUpTree_.traverse(f);
};
/**
* Calculates a top down profile for a node with the specified label.
* If no name specified, returns the whole top down calls tree.
*
* @param {string} opt_label Node label.
*/
Profile.prototype.getTopDownProfile = function(opt_label) {
return this.getTreeProfile_(this.topDownTree_, opt_label);
};
/**
* Calculates a bottom up profile for a node with the specified label.
* If no name specified, returns the whole bottom up calls tree.
*
* @param {string} opt_label Node label.
*/
Profile.prototype.getBottomUpProfile = function(opt_label) {
return this.getTreeProfile_(this.bottomUpTree_, opt_label);
};
/**
* Helper function for calculating a tree profile.
*
* @param {Profile.CallTree} tree Call tree.
* @param {string} opt_label Node label.
*/
Profile.prototype.getTreeProfile_ = function(tree, opt_label) {
if (!opt_label) {
tree.computeTotalWeights();
return tree;
} else {
var subTree = tree.cloneSubtree(opt_label);
subTree.computeTotalWeights();
return subTree;
}
};
/**
* Calculates a flat profile of callees starting from a node with
* the specified label. If no name specified, starts from the root.
*
* @param {string} opt_label Starting node label.
*/
Profile.prototype.getFlatProfile = function(opt_label) {
var counters = new CallTree();
var rootLabel = opt_label || CallTree.ROOT_NODE_LABEL;
var precs = {};
precs[rootLabel] = 0;
var root = counters.findOrAddChild(rootLabel);
this.topDownTree_.computeTotalWeights();
this.topDownTree_.traverseInDepth(
function onEnter(node) {
if (!(node.label in precs)) {
precs[node.label] = 0;
}
var nodeLabelIsRootLabel = node.label == rootLabel;
if (nodeLabelIsRootLabel || precs[rootLabel] > 0) {
if (precs[rootLabel] == 0) {
root.selfWeight += node.selfWeight;
root.totalWeight += node.totalWeight;
} else {
var rec = root.findOrAddChild(node.label);
rec.selfWeight += node.selfWeight;
if (nodeLabelIsRootLabel || precs[node.label] == 0) {
rec.totalWeight += node.totalWeight;
}
}
precs[node.label]++;
}
},
function onExit(node) {
if (node.label == rootLabel || precs[rootLabel] > 0) {
precs[node.label]--;
}
},
null);
if (!opt_label) {
// If we have created a flat profile for the whole program, we don't
// need an explicit root in it. Thus, replace the counters tree
// root with the node corresponding to the whole program.
counters.root_ = root;
} else {
// Propagate weights so percents can be calculated correctly.
counters.getRoot().selfWeight = root.selfWeight;
counters.getRoot().totalWeight = root.totalWeight;
}
return counters;
};
/**
* Cleans up function entries that are not referenced by code entries.
*/
Profile.prototype.cleanUpFuncEntries = function() {
var referencedFuncEntries = [];
var entries = this.codeMap_.getAllDynamicEntriesWithAddresses();
for (var i = 0, l = entries.length; i < l; ++i) {
if (entries[i][1].constructor === Profile.FunctionEntry) {
entries[i][1].used = false;
}
}
for (var i = 0, l = entries.length; i < l; ++i) {
if ("func" in entries[i][1]) {
entries[i][1].func.used = true;
}
}
for (var i = 0, l = entries.length; i < l; ++i) {
if (entries[i][1].constructor === Profile.FunctionEntry &&
!entries[i][1].used) {
this.codeMap_.deleteCode(entries[i][0]);
}
}
};
/**
* Creates a dynamic code entry.
*
* @param {number} size Code size.
* @param {string} type Code type.
* @param {string} name Function name.
* @constructor
*/
Profile.DynamicCodeEntry = function(size, type, name) {
CodeMap.CodeEntry.call(this, size, name);
this.type = type;
};
/**
* Returns node name.
*/
Profile.DynamicCodeEntry.prototype.getName = function() {
return this.type + ': ' + this.name;
};
/**
* Returns raw node name (without type decoration).
*/
Profile.DynamicCodeEntry.prototype.getRawName = function() {
return this.name;
};
Profile.DynamicCodeEntry.prototype.isJSFunction = function() {
return false;
};
Profile.DynamicCodeEntry.prototype.toString = function() {
return this.getName() + ': ' + this.size.toString(16);
};
/**
* Creates a dynamic code entry.
*
* @param {number} size Code size.
* @param {string} type Code type.
* @param {Profile.FunctionEntry} func Shared function entry.
* @param {Profile.CodeState} state Code optimization state.
* @constructor
*/
Profile.DynamicFuncCodeEntry = function(size, type, func, state) {
CodeMap.CodeEntry.call(this, size);
this.type = type;
this.func = func;
this.state = state;
};
Profile.DynamicFuncCodeEntry.STATE_PREFIX = ["", "~", "*"];
/**
* Returns node name.
*/
Profile.DynamicFuncCodeEntry.prototype.getName = function() {
var name = this.func.getName();
return this.type + ': ' + Profile.DynamicFuncCodeEntry.STATE_PREFIX[this.state] + name;
};
/**
* Returns raw node name (without type decoration).
*/
Profile.DynamicFuncCodeEntry.prototype.getRawName = function() {
return this.func.getName();
};
Profile.DynamicFuncCodeEntry.prototype.isJSFunction = function() {
return true;
};
Profile.DynamicFuncCodeEntry.prototype.toString = function() {
return this.getName() + ': ' + this.size.toString(16);
};
/**
* Creates a shared function object entry.
*
* @param {string} name Function name.
* @constructor
*/
Profile.FunctionEntry = function(name) {
CodeMap.CodeEntry.call(this, 0, name);
};
/**
* Returns node name.
*/
Profile.FunctionEntry.prototype.getName = function() {
var name = this.name;
if (name.length == 0) {
name = '<anonymous>';
} else if (name.charAt(0) == ' ') {
// An anonymous function with location: " aaa.js:10".
name = '<anonymous>' + name;
}
return name;
};
Profile.FunctionEntry.prototype.toString = CodeMap.CodeEntry.prototype.toString;
/**
* Constructs a call graph.
*
* @constructor
*/
function CallTree() {
this.root_ = new CallTree.Node(
CallTree.ROOT_NODE_LABEL);
};
/**
* The label of the root node.
*/
CallTree.ROOT_NODE_LABEL = '';
/**
* @private
*/
CallTree.prototype.totalsComputed_ = false;
/**
* Returns the tree root.
*/
CallTree.prototype.getRoot = function() {
return this.root_;
};
/**
* Adds the specified call path, constructing nodes as necessary.
*
* @param {Array<string>} path Call path.
*/
CallTree.prototype.addPath = function(path) {
if (path.length == 0) {
return;
}
var curr = this.root_;
for (var i = 0; i < path.length; ++i) {
curr = curr.findOrAddChild(path[i]);
}
curr.selfWeight++;
this.totalsComputed_ = false;
};
/**
* Finds an immediate child of the specified parent with the specified
* label, creates a child node if necessary. If a parent node isn't
* specified, uses tree root.
*
* @param {string} label Child node label.
*/
CallTree.prototype.findOrAddChild = function(label) {
return this.root_.findOrAddChild(label);
};
/**
* Creates a subtree by cloning and merging all subtrees rooted at nodes
* with a given label. E.g. cloning the following call tree on label 'A'
* will give the following result:
*
* <A>--<B> <B>
* / /
* <root> == clone on 'A' ==> <root>--<A>
* \ \
* <C>--<A>--<D> <D>
*
* And <A>'s selfWeight will be the sum of selfWeights of <A>'s from the
* source call tree.
*
* @param {string} label The label of the new root node.
*/
CallTree.prototype.cloneSubtree = function(label) {
var subTree = new CallTree();
this.traverse(function(node, parent) {
if (!parent && node.label != label) {
return null;
}
var child = (parent ? parent : subTree).findOrAddChild(node.label);
child.selfWeight += node.selfWeight;
return child;
});
return subTree;
};
/**
* Computes total weights in the call graph.
*/
CallTree.prototype.computeTotalWeights = function() {
if (this.totalsComputed_) {
return;
}
this.root_.computeTotalWeight();
this.totalsComputed_ = true;
};
/**
* Traverses the call graph in preorder. This function can be used for
* building optionally modified tree clones. This is the boilerplate code
* for this scenario:
*
* callTree.traverse(function(node, parentClone) {
* var nodeClone = cloneNode(node);
* if (parentClone)
* parentClone.addChild(nodeClone);
* return nodeClone;
* });
*
* @param {function(CallTree.Node, *)} f Visitor function.
* The second parameter is the result of calling 'f' on the parent node.
*/
CallTree.prototype.traverse = function(f) {
var pairsToProcess = new ConsArray();
pairsToProcess.concat([{node: this.root_, param: null}]);
while (!pairsToProcess.atEnd()) {
var pair = pairsToProcess.next();
var node = pair.node;
var newParam = f(node, pair.param);
var morePairsToProcess = [];
node.forEachChild(function (child) {
morePairsToProcess.push({node: child, param: newParam}); });
pairsToProcess.concat(morePairsToProcess);
}
};
/**
* Performs an indepth call graph traversal.
*
* @param {function(CallTree.Node)} enter A function called
* prior to visiting node's children.
* @param {function(CallTree.Node)} exit A function called
* after visiting node's children.
*/
CallTree.prototype.traverseInDepth = function(enter, exit) {
function traverse(node) {
enter(node);
node.forEachChild(traverse);
exit(node);
}
traverse(this.root_);
};
/**
* Constructs a call graph node.
*
* @param {string} label Node label.
* @param {CallTree.Node} opt_parent Node parent.
*/
CallTree.Node = function(label, opt_parent) {
this.label = label;
this.parent = opt_parent;
this.children = {};
};
/**
* Node self weight (how many times this node was the last node in
* a call path).
* @type {number}
*/
CallTree.Node.prototype.selfWeight = 0;
/**
* Node total weight (includes weights of all children).
* @type {number}
*/
CallTree.Node.prototype.totalWeight = 0;
/**
* Adds a child node.
*
* @param {string} label Child node label.
*/
CallTree.Node.prototype.addChild = function(label) {
var child = new CallTree.Node(label, this);
this.children[label] = child;
return child;
};
/**
* Computes node's total weight.
*/
CallTree.Node.prototype.computeTotalWeight =
function() {
var totalWeight = this.selfWeight;
this.forEachChild(function(child) {
totalWeight += child.computeTotalWeight(); });
return this.totalWeight = totalWeight;
};
/**
* Returns all node's children as an array.
*/
CallTree.Node.prototype.exportChildren = function() {
var result = [];
this.forEachChild(function (node) { result.push(node); });
return result;
};
/**
* Finds an immediate child with the specified label.
*
* @param {string} label Child node label.
*/
CallTree.Node.prototype.findChild = function(label) {
return this.children[label] || null;
};
/**
* Finds an immediate child with the specified label, creates a child
* node if necessary.
*
* @param {string} label Child node label.
*/
CallTree.Node.prototype.findOrAddChild = function(label) {
return this.findChild(label) || this.addChild(label);
};
/**
* Calls the specified function for every child.
*
* @param {function(CallTree.Node)} f Visitor function.
*/
CallTree.Node.prototype.forEachChild = function(f) {
for (var c in this.children) {
f(this.children[c]);
}
};
/**
* Walks up from the current node up to the call tree root.
*
* @param {function(CallTree.Node)} f Visitor function.
*/
CallTree.Node.prototype.walkUpToRoot = function(f) {
for (var curr = this; curr != null; curr = curr.parent) {
f(curr);
}
};
/**
* Tries to find a node with the specified path.
*
* @param {Array<string>} labels The path.
* @param {function(CallTree.Node)} opt_f Visitor function.
*/
CallTree.Node.prototype.descendToChild = function(
labels, opt_f) {
for (var pos = 0, curr = this; pos < labels.length && curr != null; pos++) {
var child = curr.findChild(labels[pos]);
if (opt_f) {
opt_f(child, pos);
}
curr = child;
}
return curr;
};