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// Copyright 2021 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef INCLUDE_V8_STATISTICS_H_
#define INCLUDE_V8_STATISTICS_H_
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include <utility>
#include <vector>
#include "v8-local-handle.h" // NOLINT(build/include_directory)
#include "v8-memory-span.h" // NOLINT(build/include_directory)
#include "v8-promise.h" // NOLINT(build/include_directory)
#include "v8config.h" // NOLINT(build/include_directory)
namespace v8 {
class Context;
class Isolate;
namespace internal {
class ReadOnlyHeap;
} // namespace internal
/**
* Controls how the default MeasureMemoryDelegate reports the result of
* the memory measurement to JS. With kSummary only the total size is reported.
* With kDetailed the result includes the size of each native context.
*/
enum class MeasureMemoryMode { kSummary, kDetailed };
/**
* Controls how promptly a memory measurement request is executed.
* By default the measurement is folded with the next scheduled GC which may
* happen after a while and is forced after some timeout.
* The kEager mode starts incremental GC right away and is useful for testing.
* The kLazy mode does not force GC.
*/
enum class MeasureMemoryExecution { kDefault, kEager, kLazy };
/**
* The delegate is used in Isolate::MeasureMemory API.
*
* It specifies the contexts that need to be measured and gets called when
* the measurement is completed to report the results.
*
* Both MeasurementComplete() callbacks will be invoked on completion.
* Each implementation of this class should hence implement only one of them,
* and leave the other empty.
*/
class V8_EXPORT MeasureMemoryDelegate {
public:
virtual ~MeasureMemoryDelegate() = default;
/**
* Returns true if the size of the given context needs to be measured.
*/
virtual bool ShouldMeasure(Local<Context> context) = 0;
/** Holds the result of a memory measurement request. */
struct Result {
/**
* Two spans of equal length: the first includes each context for which
* ShouldMeasure returned true and that was not garbage collected while
* the memory measurement was in progress; the second includes the size
* of the respective context.
*/
const MemorySpan<const Local<Context>>& contexts;
const MemorySpan<const size_t>& sizes_in_bytes;
/**
* Total size of objects that were not attributed to any context (i.e. are
* likely shared objects).
*/
size_t unattributed_size_in_bytes;
/** Total size of generated code for Wasm (shared across contexts). */
size_t wasm_code_size_in_bytes;
/** Total size of Wasm metadata (except code; shared across contexts). */
size_t wasm_metadata_size_in_bytes;
};
/**
* This function is called when memory measurement finishes.
*
* \param result the result of the measurement.
*/
virtual void MeasurementComplete(Result result) {}
/**
* Returns a default delegate that resolves the given promise when
* the memory measurement completes.
*
* \param isolate the current isolate
* \param context the current context
* \param promise_resolver the promise resolver that is given the
* result of the memory measurement.
* \param mode the detail level of the result.
*/
static std::unique_ptr<MeasureMemoryDelegate> Default(
Isolate* isolate, Local<Context> context,
Local<Promise::Resolver> promise_resolver, MeasureMemoryMode mode);
};
/**
* Collection of shared per-process V8 memory information.
*
* Instances of this class can be passed to
* v8::V8::GetSharedMemoryStatistics to get shared memory statistics from V8.
*/
class V8_EXPORT SharedMemoryStatistics {
public:
SharedMemoryStatistics();
size_t read_only_space_size() { return read_only_space_size_; }
size_t read_only_space_used_size() { return read_only_space_used_size_; }
size_t read_only_space_physical_size() {
return read_only_space_physical_size_;
}
private:
size_t read_only_space_size_;
size_t read_only_space_used_size_;
size_t read_only_space_physical_size_;
friend class V8;
friend class internal::ReadOnlyHeap;
};
/**
* Collection of V8 heap information.
*
* Instances of this class can be passed to v8::Isolate::GetHeapStatistics to
* get heap statistics from V8.
*/
class V8_EXPORT HeapStatistics {
public:
HeapStatistics();
size_t total_heap_size() { return total_heap_size_; }
size_t total_heap_size_executable() { return total_heap_size_executable_; }
size_t total_physical_size() { return total_physical_size_; }
size_t total_available_size() { return total_available_size_; }
size_t total_global_handles_size() { return total_global_handles_size_; }
size_t used_global_handles_size() { return used_global_handles_size_; }
size_t used_heap_size() { return used_heap_size_; }
size_t heap_size_limit() { return heap_size_limit_; }
size_t malloced_memory() { return malloced_memory_; }
size_t external_memory() { return external_memory_; }
size_t peak_malloced_memory() { return peak_malloced_memory_; }
size_t number_of_native_contexts() { return number_of_native_contexts_; }
size_t number_of_detached_contexts() { return number_of_detached_contexts_; }
/**
* Returns a 0/1 boolean, which signifies whether the V8 overwrite heap
* garbage with a bit pattern.
*/
size_t does_zap_garbage() { return does_zap_garbage_; }
private:
size_t total_heap_size_;
size_t total_heap_size_executable_;
size_t total_physical_size_;
size_t total_available_size_;
size_t used_heap_size_;
size_t heap_size_limit_;
size_t malloced_memory_;
size_t external_memory_;
size_t peak_malloced_memory_;
bool does_zap_garbage_;
size_t number_of_native_contexts_;
size_t number_of_detached_contexts_;
size_t total_global_handles_size_;
size_t used_global_handles_size_;
friend class V8;
friend class Isolate;
};
class V8_EXPORT HeapSpaceStatistics {
public:
HeapSpaceStatistics();
const char* space_name() { return space_name_; }
size_t space_size() { return space_size_; }
size_t space_used_size() { return space_used_size_; }
size_t space_available_size() { return space_available_size_; }
size_t physical_space_size() { return physical_space_size_; }
private:
const char* space_name_;
size_t space_size_;
size_t space_used_size_;
size_t space_available_size_;
size_t physical_space_size_;
friend class Isolate;
};
class V8_EXPORT HeapObjectStatistics {
public:
HeapObjectStatistics();
const char* object_type() { return object_type_; }
const char* object_sub_type() { return object_sub_type_; }
size_t object_count() { return object_count_; }
size_t object_size() { return object_size_; }
private:
const char* object_type_;
const char* object_sub_type_;
size_t object_count_;
size_t object_size_;
friend class Isolate;
};
class V8_EXPORT HeapCodeStatistics {
public:
HeapCodeStatistics();
size_t code_and_metadata_size() { return code_and_metadata_size_; }
size_t bytecode_and_metadata_size() { return bytecode_and_metadata_size_; }
size_t external_script_source_size() { return external_script_source_size_; }
size_t cpu_profiler_metadata_size() { return cpu_profiler_metadata_size_; }
private:
size_t code_and_metadata_size_;
size_t bytecode_and_metadata_size_;
size_t external_script_source_size_;
size_t cpu_profiler_metadata_size_;
friend class Isolate;
};
} // namespace v8
#endif // INCLUDE_V8_STATISTICS_H_