| // Copyright 2010 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. |
| |
| #ifndef V8_V8_PROFILER_H_ |
| #define V8_V8_PROFILER_H_ |
| |
| #include "v8.h" |
| |
| #ifdef _WIN32 |
| // Setup for Windows DLL export/import. See v8.h in this directory for |
| // information on how to build/use V8 as a DLL. |
| #if defined(BUILDING_V8_SHARED) && defined(USING_V8_SHARED) |
| #error both BUILDING_V8_SHARED and USING_V8_SHARED are set - please check the\ |
| build configuration to ensure that at most one of these is set |
| #endif |
| |
| #ifdef BUILDING_V8_SHARED |
| #define V8EXPORT __declspec(dllexport) |
| #elif USING_V8_SHARED |
| #define V8EXPORT __declspec(dllimport) |
| #else |
| #define V8EXPORT |
| #endif |
| |
| #else // _WIN32 |
| |
| // Setup for Linux shared library export. See v8.h in this directory for |
| // information on how to build/use V8 as shared library. |
| #if defined(__GNUC__) && (__GNUC__ >= 4) && defined(V8_SHARED) |
| #define V8EXPORT __attribute__ ((visibility("default"))) |
| #else // defined(__GNUC__) && (__GNUC__ >= 4) |
| #define V8EXPORT |
| #endif // defined(__GNUC__) && (__GNUC__ >= 4) |
| |
| #endif // _WIN32 |
| |
| |
| /** |
| * Profiler support for the V8 JavaScript engine. |
| */ |
| namespace v8 { |
| |
| |
| /** |
| * CpuProfileNode represents a node in a call graph. |
| */ |
| class V8EXPORT CpuProfileNode { |
| public: |
| /** Returns function name (empty string for anonymous functions.) */ |
| Handle<String> GetFunctionName() const; |
| |
| /** Returns resource name for script from where the function originates. */ |
| Handle<String> GetScriptResourceName() const; |
| |
| /** |
| * Returns the number, 1-based, of the line where the function originates. |
| * kNoLineNumberInfo if no line number information is available. |
| */ |
| int GetLineNumber() const; |
| |
| /** |
| * Returns total (self + children) execution time of the function, |
| * in milliseconds, estimated by samples count. |
| */ |
| double GetTotalTime() const; |
| |
| /** |
| * Returns self execution time of the function, in milliseconds, |
| * estimated by samples count. |
| */ |
| double GetSelfTime() const; |
| |
| /** Returns the count of samples where function exists. */ |
| double GetTotalSamplesCount() const; |
| |
| /** Returns the count of samples where function was currently executing. */ |
| double GetSelfSamplesCount() const; |
| |
| /** Returns function entry UID. */ |
| unsigned GetCallUid() const; |
| |
| /** Returns child nodes count of the node. */ |
| int GetChildrenCount() const; |
| |
| /** Retrieves a child node by index. */ |
| const CpuProfileNode* GetChild(int index) const; |
| |
| static const int kNoLineNumberInfo = Message::kNoLineNumberInfo; |
| }; |
| |
| |
| /** |
| * CpuProfile contains a CPU profile in a form of two call trees: |
| * - top-down (from main() down to functions that do all the work); |
| * - bottom-up call graph (in backward direction). |
| */ |
| class V8EXPORT CpuProfile { |
| public: |
| /** Returns CPU profile UID (assigned by the profiler.) */ |
| unsigned GetUid() const; |
| |
| /** Returns CPU profile title. */ |
| Handle<String> GetTitle() const; |
| |
| /** Returns the root node of the bottom up call tree. */ |
| const CpuProfileNode* GetBottomUpRoot() const; |
| |
| /** Returns the root node of the top down call tree. */ |
| const CpuProfileNode* GetTopDownRoot() const; |
| |
| /** |
| * Deletes the profile and removes it from CpuProfiler's list. |
| * All pointers to nodes previously returned become invalid. |
| * Profiles with the same uid but obtained using different |
| * security token are not deleted, but become inaccessible |
| * using FindProfile method. It is embedder's responsibility |
| * to call Delete on these profiles. |
| */ |
| void Delete(); |
| }; |
| |
| |
| /** |
| * Interface for controlling CPU profiling. |
| */ |
| class V8EXPORT CpuProfiler { |
| public: |
| /** |
| * A note on security tokens usage. As scripts from different |
| * origins can run inside a single V8 instance, it is possible to |
| * have functions from different security contexts intermixed in a |
| * single CPU profile. To avoid exposing function names belonging to |
| * other contexts, filtering by security token is performed while |
| * obtaining profiling results. |
| */ |
| |
| /** |
| * Returns the number of profiles collected (doesn't include |
| * profiles that are being collected at the moment of call.) |
| */ |
| static int GetProfilesCount(); |
| |
| /** Returns a profile by index. */ |
| static const CpuProfile* GetProfile( |
| int index, |
| Handle<Value> security_token = Handle<Value>()); |
| |
| /** Returns a profile by uid. */ |
| static const CpuProfile* FindProfile( |
| unsigned uid, |
| Handle<Value> security_token = Handle<Value>()); |
| |
| /** |
| * Starts collecting CPU profile. Title may be an empty string. It |
| * is allowed to have several profiles being collected at |
| * once. Attempts to start collecting several profiles with the same |
| * title are silently ignored. While collecting a profile, functions |
| * from all security contexts are included in it. The token-based |
| * filtering is only performed when querying for a profile. |
| */ |
| static void StartProfiling(Handle<String> title); |
| |
| /** |
| * Stops collecting CPU profile with a given title and returns it. |
| * If the title given is empty, finishes the last profile started. |
| */ |
| static const CpuProfile* StopProfiling( |
| Handle<String> title, |
| Handle<Value> security_token = Handle<Value>()); |
| |
| /** |
| * Deletes all existing profiles, also cancelling all profiling |
| * activity. All previously returned pointers to profiles and their |
| * contents become invalid after this call. |
| */ |
| static void DeleteAllProfiles(); |
| }; |
| |
| |
| class HeapGraphNode; |
| |
| |
| /** |
| * HeapSnapshotEdge represents a directed connection between heap |
| * graph nodes: from retainers to retained nodes. |
| */ |
| class V8EXPORT HeapGraphEdge { |
| public: |
| enum Type { |
| kContextVariable = 0, // A variable from a function context. |
| kElement = 1, // An element of an array. |
| kProperty = 2, // A named object property. |
| kInternal = 3, // A link that can't be accessed from JS, |
| // thus, its name isn't a real property name |
| // (e.g. parts of a ConsString). |
| kHidden = 4, // A link that is needed for proper sizes |
| // calculation, but may be hidden from user. |
| kShortcut = 5, // A link that must not be followed during |
| // sizes calculation. |
| kWeak = 6 // A weak reference (ignored by the GC). |
| }; |
| |
| /** Returns edge type (see HeapGraphEdge::Type). */ |
| Type GetType() const; |
| |
| /** |
| * Returns edge name. This can be a variable name, an element index, or |
| * a property name. |
| */ |
| Handle<Value> GetName() const; |
| |
| /** Returns origin node. */ |
| const HeapGraphNode* GetFromNode() const; |
| |
| /** Returns destination node. */ |
| const HeapGraphNode* GetToNode() const; |
| }; |
| |
| |
| /** |
| * HeapGraphNode represents a node in a heap graph. |
| */ |
| class V8EXPORT HeapGraphNode { |
| public: |
| enum Type { |
| kHidden = 0, // Hidden node, may be filtered when shown to user. |
| kArray = 1, // An array of elements. |
| kString = 2, // A string. |
| kObject = 3, // A JS object (except for arrays and strings). |
| kCode = 4, // Compiled code. |
| kClosure = 5, // Function closure. |
| kRegExp = 6, // RegExp. |
| kHeapNumber = 7, // Number stored in the heap. |
| kNative = 8 // Native object (not from V8 heap). |
| }; |
| |
| /** Returns node type (see HeapGraphNode::Type). */ |
| Type GetType() const; |
| |
| /** |
| * Returns node name. Depending on node's type this can be the name |
| * of the constructor (for objects), the name of the function (for |
| * closures), string value, or an empty string (for compiled code). |
| */ |
| Handle<String> GetName() const; |
| |
| /** |
| * Returns node id. For the same heap object, the id remains the same |
| * across all snapshots. |
| */ |
| uint64_t GetId() const; |
| |
| /** Returns node's own size, in bytes. */ |
| int GetSelfSize() const; |
| |
| /** |
| * Returns node's retained size, in bytes. That is, self + sizes of |
| * the objects that are reachable only from this object. In other |
| * words, the size of memory that will be reclaimed having this node |
| * collected. |
| * |
| * Exact retained size calculation has O(N) (number of nodes) |
| * computational complexity, while approximate has O(1). It is |
| * assumed that initially heap profiling tools provide approximate |
| * sizes for all nodes, and then exact sizes are calculated for the |
| * most 'interesting' nodes. |
| */ |
| int GetRetainedSize(bool exact) const; |
| |
| /** Returns child nodes count of the node. */ |
| int GetChildrenCount() const; |
| |
| /** Retrieves a child by index. */ |
| const HeapGraphEdge* GetChild(int index) const; |
| |
| /** Returns retainer nodes count of the node. */ |
| int GetRetainersCount() const; |
| |
| /** Returns a retainer by index. */ |
| const HeapGraphEdge* GetRetainer(int index) const; |
| |
| /** |
| * Returns a dominator node. This is the node that participates in every |
| * path from the snapshot root to the current node. |
| */ |
| const HeapGraphNode* GetDominatorNode() const; |
| |
| /** |
| * Finds and returns a value from the heap corresponding to this node, |
| * if the value is still reachable. |
| */ |
| Handle<Value> GetHeapValue() const; |
| }; |
| |
| |
| /** |
| * HeapSnapshots record the state of the JS heap at some moment. |
| */ |
| class V8EXPORT HeapSnapshot { |
| public: |
| enum Type { |
| kFull = 0 // Heap snapshot with all instances and references. |
| }; |
| enum SerializationFormat { |
| kJSON = 0 // See format description near 'Serialize' method. |
| }; |
| |
| /** Returns heap snapshot type. */ |
| Type GetType() const; |
| |
| /** Returns heap snapshot UID (assigned by the profiler.) */ |
| unsigned GetUid() const; |
| |
| /** Returns heap snapshot title. */ |
| Handle<String> GetTitle() const; |
| |
| /** Returns the root node of the heap graph. */ |
| const HeapGraphNode* GetRoot() const; |
| |
| /** Returns a node by its id. */ |
| const HeapGraphNode* GetNodeById(uint64_t id) const; |
| |
| /** Returns total nodes count in the snapshot. */ |
| int GetNodesCount() const; |
| |
| /** Returns a node by index. */ |
| const HeapGraphNode* GetNode(int index) const; |
| |
| /** |
| * Deletes the snapshot and removes it from HeapProfiler's list. |
| * All pointers to nodes, edges and paths previously returned become |
| * invalid. |
| */ |
| void Delete(); |
| |
| /** |
| * Prepare a serialized representation of the snapshot. The result |
| * is written into the stream provided in chunks of specified size. |
| * The total length of the serialized snapshot is unknown in |
| * advance, it can be roughly equal to JS heap size (that means, |
| * it can be really big - tens of megabytes). |
| * |
| * For the JSON format, heap contents are represented as an object |
| * with the following structure: |
| * |
| * { |
| * snapshot: {title: "...", uid: nnn}, |
| * nodes: [ |
| * meta-info (JSON string), |
| * nodes themselves |
| * ], |
| * strings: [strings] |
| * } |
| * |
| * Outgoing node links are stored after each node. Nodes reference strings |
| * and other nodes by their indexes in corresponding arrays. |
| */ |
| void Serialize(OutputStream* stream, SerializationFormat format) const; |
| }; |
| |
| |
| class RetainedObjectInfo; |
| |
| /** |
| * Interface for controlling heap profiling. |
| */ |
| class V8EXPORT HeapProfiler { |
| public: |
| /** |
| * Callback function invoked for obtaining RetainedObjectInfo for |
| * the given JavaScript wrapper object. It is prohibited to enter V8 |
| * while the callback is running: only getters on the handle and |
| * GetPointerFromInternalField on the objects are allowed. |
| */ |
| typedef RetainedObjectInfo* (*WrapperInfoCallback) |
| (uint16_t class_id, Handle<Value> wrapper); |
| |
| /** Returns the number of snapshots taken. */ |
| static int GetSnapshotsCount(); |
| |
| /** Returns a snapshot by index. */ |
| static const HeapSnapshot* GetSnapshot(int index); |
| |
| /** Returns a profile by uid. */ |
| static const HeapSnapshot* FindSnapshot(unsigned uid); |
| |
| /** |
| * Takes a heap snapshot and returns it. Title may be an empty string. |
| * See HeapSnapshot::Type for types description. |
| */ |
| static const HeapSnapshot* TakeSnapshot( |
| Handle<String> title, |
| HeapSnapshot::Type type = HeapSnapshot::kFull, |
| ActivityControl* control = NULL); |
| |
| /** |
| * Deletes all snapshots taken. All previously returned pointers to |
| * snapshots and their contents become invalid after this call. |
| */ |
| static void DeleteAllSnapshots(); |
| |
| /** Binds a callback to embedder's class ID. */ |
| static void DefineWrapperClass( |
| uint16_t class_id, |
| WrapperInfoCallback callback); |
| |
| /** |
| * Default value of persistent handle class ID. Must not be used to |
| * define a class. Can be used to reset a class of a persistent |
| * handle. |
| */ |
| static const uint16_t kPersistentHandleNoClassId = 0; |
| }; |
| |
| |
| /** |
| * Interface for providing information about embedder's objects |
| * held by global handles. This information is reported in two ways: |
| * |
| * 1. When calling AddObjectGroup, an embedder may pass |
| * RetainedObjectInfo instance describing the group. To collect |
| * this information while taking a heap snapshot, V8 calls GC |
| * prologue and epilogue callbacks. |
| * |
| * 2. When a heap snapshot is collected, V8 additionally |
| * requests RetainedObjectInfos for persistent handles that |
| * were not previously reported via AddObjectGroup. |
| * |
| * Thus, if an embedder wants to provide information about native |
| * objects for heap snapshots, he can do it in a GC prologue |
| * handler, and / or by assigning wrapper class ids in the following way: |
| * |
| * 1. Bind a callback to class id by calling DefineWrapperClass. |
| * 2. Call SetWrapperClassId on certain persistent handles. |
| * |
| * V8 takes ownership of RetainedObjectInfo instances passed to it and |
| * keeps them alive only during snapshot collection. Afterwards, they |
| * are freed by calling the Dispose class function. |
| */ |
| class V8EXPORT RetainedObjectInfo { // NOLINT |
| public: |
| /** Called by V8 when it no longer needs an instance. */ |
| virtual void Dispose() = 0; |
| |
| /** Returns whether two instances are equivalent. */ |
| virtual bool IsEquivalent(RetainedObjectInfo* other) = 0; |
| |
| /** |
| * Returns hash value for the instance. Equivalent instances |
| * must have the same hash value. |
| */ |
| virtual intptr_t GetHash() = 0; |
| |
| /** |
| * Returns human-readable label. It must be a NUL-terminated UTF-8 |
| * encoded string. V8 copies its contents during a call to GetLabel. |
| */ |
| virtual const char* GetLabel() = 0; |
| |
| /** |
| * Returns element count in case if a global handle retains |
| * a subgraph by holding one of its nodes. |
| */ |
| virtual intptr_t GetElementCount() { return -1; } |
| |
| /** Returns embedder's object size in bytes. */ |
| virtual intptr_t GetSizeInBytes() { return -1; } |
| |
| protected: |
| RetainedObjectInfo() {} |
| virtual ~RetainedObjectInfo() {} |
| |
| private: |
| RetainedObjectInfo(const RetainedObjectInfo&); |
| RetainedObjectInfo& operator=(const RetainedObjectInfo&); |
| }; |
| |
| |
| } // namespace v8 |
| |
| |
| #undef V8EXPORT |
| |
| |
| #endif // V8_V8_PROFILER_H_ |