tracing: memory-infra cleanup post-C++11 + test coverage

base/trace_event/process_memory_dump.h

 // Copyright 2015 The Chromium 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 BASE_TRACE_EVENT_PROCESS_MEMORY_DUMP_H_
 #define BASE_TRACE_EVENT_PROCESS_MEMORY_DUMP_H_
 
 #include <stddef.h>
 
+#include <unordered_map>
 #include <vector>
 
 #include "base/base_export.h"
-#include "base/containers/hash_tables.h"
-#include "base/containers/small_map.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_vector.h"
 #include "base/trace_event/memory_allocator_dump.h"
 #include "base/trace_event/memory_allocator_dump_guid.h"
 #include "base/trace_event/memory_dump_session_state.h"
 #include "base/trace_event/process_memory_maps.h"
 #include "base/trace_event/process_memory_totals.h"
 #include "build/build_config.h"
 
 // Define COUNT_RESIDENT_BYTES_SUPPORTED if platform supports counting of the
 // resident memory.
 // TODO(crbug.com/542671): COUNT_RESIDENT_BYTES_SUPPORTED is disabled on iOS
 // as it cause memory corruption on iOS 9.0+ devices.
 #if (defined(OS_POSIX) && !defined(OS_NACL) && !defined(OS_IOS)) || \
     defined(OS_WIN)
 #define COUNT_RESIDENT_BYTES_SUPPORTED
 #endif
 
 namespace base {
 namespace trace_event {
 
-class ConvertableToTraceFormat;
 class MemoryDumpManager;
 class MemoryDumpSessionState;
 class TracedValue;
 
 // ProcessMemoryDump is as a strongly typed container which holds the dumps
 // produced by the MemoryDumpProvider(s) for a specific process.
 class BASE_EXPORT ProcessMemoryDump {
  public:
   struct MemoryAllocatorDumpEdge {
     MemoryAllocatorDumpGuid source;
     MemoryAllocatorDumpGuid target;
     int importance;
     const char* type;
   };
 
   // Maps allocator dumps absolute names (allocator_name/heap/subheap) to
   // MemoryAllocatorDump instances.
   using AllocatorDumpsMap =
-      SmallMap<hash_map<std::string, MemoryAllocatorDump*>>;
+      std::unordered_map<std::string, scoped_ptr<MemoryAllocatorDump>>;
 
   using HeapDumpsMap =
-      SmallMap<hash_map<std::string, scoped_refptr<TracedValue>>>;
+      std::unordered_map<std::string, scoped_refptr<TracedValue>>;
 
 #if defined(COUNT_RESIDENT_BYTES_SUPPORTED)
   // Returns the total bytes resident for a virtual address range, with given
   // |start_address| and |mapped_size|. |mapped_size| is specified in bytes. The
   // value returned is valid only if the given range is currently mmapped by the
   // process. The |start_address| must be page-aligned.
   static size_t CountResidentBytes(void* start_address, size_t mapped_size);
 #endif
 
   ProcessMemoryDump(const scoped_refptr<MemoryDumpSessionState>& session_state);
@@ skipping 94 matching lines @@
   void AsValueInto(TracedValue* value) const;
 
   ProcessMemoryTotals* process_totals() { return &process_totals_; }
   bool has_process_totals() const { return has_process_totals_; }
   void set_has_process_totals() { has_process_totals_ = true; }
 
   ProcessMemoryMaps* process_mmaps() { return &process_mmaps_; }
   bool has_process_mmaps() const { return has_process_mmaps_; }
   void set_has_process_mmaps() { has_process_mmaps_ = true; }
 
+  const HeapDumpsMap& heap_dumps() const { return heap_dumps_; }
+
  private:
-  void AddAllocatorDumpInternal(MemoryAllocatorDump* mad);
+  MemoryAllocatorDump* AddAllocatorDumpInternal(
+      scoped_ptr<MemoryAllocatorDump> mad);
 
   ProcessMemoryTotals process_totals_;
   bool has_process_totals_;
 
   ProcessMemoryMaps process_mmaps_;
   bool has_process_mmaps_;
 
   AllocatorDumpsMap allocator_dumps_;
   HeapDumpsMap heap_dumps_;
 
-  // ProcessMemoryDump handles the memory ownership of all its belongings.
-  ScopedVector<MemoryAllocatorDump> allocator_dumps_storage_;
-
   // State shared among all PMDs instances created in a given trace session.
   scoped_refptr<MemoryDumpSessionState> session_state_;
 
   // Keeps track of relationships between MemoryAllocatorDump(s).
   std::vector<MemoryAllocatorDumpEdge> allocator_dumps_edges_;
 
   DISALLOW_COPY_AND_ASSIGN(ProcessMemoryDump);
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_PROCESS_MEMORY_DUMP_H_