v8/src/heap-profiler.h

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// Copyright 2009-2010 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_HEAP_PROFILER_H_
#define V8_HEAP_PROFILER_H_
#include "zone-inl.h"
namespace v8 {
namespace internal {
#ifdef ENABLE_LOGGING_AND_PROFILING
class HeapSnapshot;
class HeapSnapshotsCollection;
#define HEAP_PROFILE(Call) \
do { \
if (v8::internal::HeapProfiler::is_profiling()) { \
v8::internal::HeapProfiler::Call; \
} \
} while (false)
#else
#define HEAP_PROFILE(Call) ((void) 0)
#endif // ENABLE_LOGGING_AND_PROFILING
// The HeapProfiler writes data to the log files, which can be postprocessed
// to generate .hp files for use by the GHC/Valgrind tool hp2ps.
class HeapProfiler {
public:
static void Setup();
static void TearDown();
#ifdef ENABLE_LOGGING_AND_PROFILING
static HeapSnapshot* TakeSnapshot(const char* name,
int type,
v8::ActivityControl* control);
static HeapSnapshot* TakeSnapshot(String* name,
int type,
v8::ActivityControl* control);
static int GetSnapshotsCount();
static HeapSnapshot* GetSnapshot(int index);
static HeapSnapshot* FindSnapshot(unsigned uid);
static void ObjectMoveEvent(Address from, Address to);
static INLINE(bool is_profiling()) {
return singleton_ != NULL && singleton_->snapshots_->is_tracking_objects();
}
// Obsolete interface.
// Write a single heap sample to the log file.
static void WriteSample();
private:
HeapProfiler();
~HeapProfiler();
HeapSnapshot* TakeSnapshotImpl(const char* name,
int type,
v8::ActivityControl* control);
HeapSnapshot* TakeSnapshotImpl(String* name,
int type,
v8::ActivityControl* control);
HeapSnapshotsCollection* snapshots_;
unsigned next_snapshot_uid_;
static HeapProfiler* singleton_;
#endif // ENABLE_LOGGING_AND_PROFILING
};
#ifdef ENABLE_LOGGING_AND_PROFILING
// JSObjectsCluster describes a group of JS objects that are
// considered equivalent in terms of a particular profile.
class JSObjectsCluster BASE_EMBEDDED {
public:
// These special cases are used in retainer profile.
enum SpecialCase {
ROOTS = 1,
GLOBAL_PROPERTY = 2,
CODE = 3,
SELF = 100 // This case is used in ClustersCoarser only.
};
JSObjectsCluster() : constructor_(NULL), instance_(NULL) {}
explicit JSObjectsCluster(String* constructor)
: constructor_(constructor), instance_(NULL) {}
explicit JSObjectsCluster(SpecialCase special)
: constructor_(FromSpecialCase(special)), instance_(NULL) {}
JSObjectsCluster(String* constructor, Object* instance)
: constructor_(constructor), instance_(instance) {}
static int CompareConstructors(const JSObjectsCluster& a,
const JSObjectsCluster& b) {
// Strings are unique, so it is sufficient to compare their pointers.
return a.constructor_ == b.constructor_ ? 0
: (a.constructor_ < b.constructor_ ? -1 : 1);
}
static int Compare(const JSObjectsCluster& a, const JSObjectsCluster& b) {
// Strings are unique, so it is sufficient to compare their pointers.
const int cons_cmp = CompareConstructors(a, b);
return cons_cmp == 0 ?
(a.instance_ == b.instance_ ? 0 : (a.instance_ < b.instance_ ? -1 : 1))
: cons_cmp;
}
static int Compare(const JSObjectsCluster* a, const JSObjectsCluster* b) {
return Compare(*a, *b);
}
bool is_null() const { return constructor_ == NULL; }
bool can_be_coarsed() const { return instance_ != NULL; }
String* constructor() const { return constructor_; }
Object* instance() const { return instance_; }
const char* GetSpecialCaseName() const;
void Print(StringStream* accumulator) const;
// Allows null clusters to be printed.
void DebugPrint(StringStream* accumulator) const;
private:
static String* FromSpecialCase(SpecialCase special) {
// We use symbols that are illegal JS identifiers to identify special cases.
// Their actual value is irrelevant for us.
switch (special) {
case ROOTS: return Heap::result_symbol();
case GLOBAL_PROPERTY: return Heap::code_symbol();
case CODE: return Heap::arguments_shadow_symbol();
case SELF: return Heap::catch_var_symbol();
default:
UNREACHABLE();
return NULL;
}
}
String* constructor_;
Object* instance_;
};
struct JSObjectsClusterTreeConfig {
typedef JSObjectsCluster Key;
typedef NumberAndSizeInfo Value;
static const Key kNoKey;
static const Value kNoValue;
static int Compare(const Key& a, const Key& b) {
return Key::Compare(a, b);
}
};
typedef ZoneSplayTree<JSObjectsClusterTreeConfig> JSObjectsClusterTree;
// ConstructorHeapProfile is responsible for gathering and logging
// "constructor profile" of JS objects allocated on heap.
// It is run during garbage collection cycle, thus it doesn't need
// to use handles.
class ConstructorHeapProfile BASE_EMBEDDED {
public:
ConstructorHeapProfile();
virtual ~ConstructorHeapProfile() {}
void CollectStats(HeapObject* obj);
void PrintStats();
template<class Callback>
void ForEach(Callback* callback) { js_objects_info_tree_.ForEach(callback); }
// Used by ZoneSplayTree::ForEach. Made virtual to allow overriding in tests.
virtual void Call(const JSObjectsCluster& cluster,
const NumberAndSizeInfo& number_and_size);
private:
ZoneScope zscope_;
JSObjectsClusterTree js_objects_info_tree_;
};
// JSObjectsRetainerTree is used to represent retainer graphs using
// adjacency list form:
//
// Cluster -> (Cluster -> NumberAndSizeInfo)
//
// Subordinate splay trees are stored by pointer. They are zone-allocated,
// so it isn't needed to manage their lifetime.
//
struct JSObjectsRetainerTreeConfig {
typedef JSObjectsCluster Key;
typedef JSObjectsClusterTree* Value;
static const Key kNoKey;
static const Value kNoValue;
static int Compare(const Key& a, const Key& b) {
return Key::Compare(a, b);
}
};
typedef ZoneSplayTree<JSObjectsRetainerTreeConfig> JSObjectsRetainerTree;
class ClustersCoarser BASE_EMBEDDED {
public:
ClustersCoarser();
// Processes a given retainer graph.
void Process(JSObjectsRetainerTree* tree);
// Returns an equivalent cluster (can be the cluster itself).
// If the given cluster doesn't have an equivalent, returns null cluster.
JSObjectsCluster GetCoarseEquivalent(const JSObjectsCluster& cluster);
// Returns whether a cluster can be substitued with an equivalent and thus,
// skipped in some cases.
bool HasAnEquivalent(const JSObjectsCluster& cluster);
// Used by JSObjectsRetainerTree::ForEach.
void Call(const JSObjectsCluster& cluster, JSObjectsClusterTree* tree);
void Call(const JSObjectsCluster& cluster,
const NumberAndSizeInfo& number_and_size);
private:
// Stores a list of back references for a cluster.
struct ClusterBackRefs {
explicit ClusterBackRefs(const JSObjectsCluster& cluster_);
ClusterBackRefs(const ClusterBackRefs& src);
ClusterBackRefs& operator=(const ClusterBackRefs& src);
static int Compare(const ClusterBackRefs& a, const ClusterBackRefs& b);
void SortRefs() { refs.Sort(JSObjectsCluster::Compare); }
static void SortRefsIterator(ClusterBackRefs* ref) { ref->SortRefs(); }
JSObjectsCluster cluster;
ZoneList<JSObjectsCluster> refs;
};
typedef ZoneList<ClusterBackRefs> SimilarityList;
// A tree for storing a list of equivalents for a cluster.
struct ClusterEqualityConfig {
typedef JSObjectsCluster Key;
typedef JSObjectsCluster Value;
static const Key kNoKey;
static const Value kNoValue;
static int Compare(const Key& a, const Key& b) {
return Key::Compare(a, b);
}
};
typedef ZoneSplayTree<ClusterEqualityConfig> EqualityTree;
static int ClusterBackRefsCmp(const ClusterBackRefs* a,
const ClusterBackRefs* b) {
return ClusterBackRefs::Compare(*a, *b);
}
int DoProcess(JSObjectsRetainerTree* tree);
int FillEqualityTree();
static const int kInitialBackrefsListCapacity = 2;
static const int kInitialSimilarityListCapacity = 2000;
// Number of passes for finding equivalents. Limits the length of paths
// that can be considered equivalent.
static const int kMaxPassesCount = 10;
ZoneScope zscope_;
SimilarityList sim_list_;
EqualityTree eq_tree_;
ClusterBackRefs* current_pair_;
JSObjectsRetainerTree* current_set_;
const JSObjectsCluster* self_;
};
// RetainerHeapProfile is responsible for gathering and logging
// "retainer profile" of JS objects allocated on heap.
// It is run during garbage collection cycle, thus it doesn't need
// to use handles.
class RetainerTreeAggregator;
class RetainerHeapProfile BASE_EMBEDDED {
public:
class Printer {
public:
virtual ~Printer() {}
virtual void PrintRetainers(const JSObjectsCluster& cluster,
const StringStream& retainers) = 0;
};
RetainerHeapProfile();
~RetainerHeapProfile();
RetainerTreeAggregator* aggregator() { return aggregator_; }
ClustersCoarser* coarser() { return &coarser_; }
JSObjectsRetainerTree* retainers_tree() { return &retainers_tree_; }
void CollectStats(HeapObject* obj);
void CoarseAndAggregate();
void PrintStats();
void DebugPrintStats(Printer* printer);
void StoreReference(const JSObjectsCluster& cluster, HeapObject* ref);
private:
ZoneScope zscope_;
JSObjectsRetainerTree retainers_tree_;
ClustersCoarser coarser_;
RetainerTreeAggregator* aggregator_;
};
class AggregatedHeapSnapshot {
public:
AggregatedHeapSnapshot();
~AggregatedHeapSnapshot();
HistogramInfo* info() { return info_; }
ConstructorHeapProfile* js_cons_profile() { return &js_cons_profile_; }
RetainerHeapProfile* js_retainer_profile() { return &js_retainer_profile_; }
private:
HistogramInfo* info_;
ConstructorHeapProfile js_cons_profile_;
RetainerHeapProfile js_retainer_profile_;
};
class HeapEntriesMap;
class HeapSnapshot;
class AggregatedHeapSnapshotGenerator {
public:
explicit AggregatedHeapSnapshotGenerator(AggregatedHeapSnapshot* snapshot);
void GenerateSnapshot();
void FillHeapSnapshot(HeapSnapshot* snapshot);
static const int kAllStringsType = LAST_TYPE + 1;
private:
void CalculateStringsStats();
void CollectStats(HeapObject* obj);
template<class Iterator>
void IterateRetainers(HeapEntriesMap* entries_map);
AggregatedHeapSnapshot* agg_snapshot_;
};
class ProducerHeapProfile : public AllStatic {
public:
static void Setup();
static void RecordJSObjectAllocation(Object* obj) {
if (FLAG_log_producers) DoRecordJSObjectAllocation(obj);
}
private:
static void DoRecordJSObjectAllocation(Object* obj);
static bool can_log_;
};
#endif // ENABLE_LOGGING_AND_PROFILING
} } // namespace v8::internal
#endif // V8_HEAP_PROFILER_H_