Revert "Updated MallocHooks to collect stack traces when memory is allocated."

runtime/vm/malloc_hooks.cc

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 
-#if defined(DART_USE_TCMALLOC) && !defined(PRODUCT) &&                         \
-    !defined(TARGET_ARCH_DBC) && !defined(TARGET_OS_FUCHSIA)
+#if defined(DART_USE_TCMALLOC) && !defined(PRODUCT)
 
 #include "vm/malloc_hooks.h"
 
 #include "gperftools/malloc_hook.h"
 
 #include "platform/assert.h"
 #include "vm/hash_map.h"
 #include "vm/json_stream.h"
 #include "vm/lockers.h"
-#include "vm/profiler.h"
 
 namespace dart {
 
-class AddressMap;
-
-// MallocHooksState contains all of the state related to the configuration of
-// the malloc hooks, allocation information, and locks.
-class MallocHooksState : public AllStatic {
- public:
-  static void RecordAllocHook(const void* ptr, size_t size);
-  static void RecordFreeHook(const void* ptr);
-
-  static bool Active() {
-    ASSERT(malloc_hook_mutex()->IsOwnedByCurrentThread());
-    return active_;
-  }
-  static void Init();
-
-  static bool ProfilingEnabled() { return (OSThread::TryCurrent() != NULL); }
-
-  static bool stack_trace_collection_enabled() {
-    return stack_trace_collection_enabled_;
-  }
-
-  static void set_stack_trace_collection_enabled(bool enabled) {
-    stack_trace_collection_enabled_ = enabled;
-  }
-
-  static bool IsOriginalProcess() {
-    ASSERT(original_pid_ != kInvalidPid);
-    return original_pid_ == OS::ProcessId();
-  }
-
-  static Mutex* malloc_hook_mutex() { return malloc_hook_mutex_; }
-
-  static intptr_t allocation_count() { return allocation_count_; }
-
-  static intptr_t heap_allocated_memory_in_bytes() {
-    return heap_allocated_memory_in_bytes_;
-  }
-
-  static void IncrementHeapAllocatedMemoryInBytes(intptr_t size) {
-    ASSERT(malloc_hook_mutex()->IsOwnedByCurrentThread());
-    ASSERT(size >= 0);
-    heap_allocated_memory_in_bytes_ += size;
-    ++allocation_count_;
-  }
-
-  static void DecrementHeapAllocatedMemoryInBytes(intptr_t size) {
-    ASSERT(malloc_hook_mutex()->IsOwnedByCurrentThread());
-    ASSERT(size >= 0);
-    ASSERT(heap_allocated_memory_in_bytes_ >= size);
-    heap_allocated_memory_in_bytes_ -= size;
-    --allocation_count_;
-    ASSERT(allocation_count_ >= 0);
-  }
-
-  static AddressMap* address_map() { return address_map_; }
-
-  static void ResetStats();
-  static void TearDown();
-
- private:
-  static Mutex* malloc_hook_mutex_;
-
-  // Variables protected by malloc_hook_mutex_.
-  static bool active_;
-  static bool stack_trace_collection_enabled_;
-  static intptr_t allocation_count_;
-  static intptr_t heap_allocated_memory_in_bytes_;
-  static AddressMap* address_map_;
-  // End protected variables.
-
-  static intptr_t original_pid_;
-  static const intptr_t kInvalidPid = -1;
-};
-
 // A locker-type class to automatically grab and release the
 // in_malloc_hook_flag_.
 class MallocHookScope {
  public:
   static void InitMallocHookFlag() {
     MutexLocker ml(malloc_hook_scope_mutex_);
     ASSERT(in_malloc_hook_flag_ == kUnsetThreadLocalKey);
     in_malloc_hook_flag_ = OSThread::CreateThreadLocal();
     OSThread::SetThreadLocal(in_malloc_hook_flag_, 0);
   }
@@ skipping 32 matching lines @@
   }
 
  private:
   static Mutex* malloc_hook_scope_mutex_;
   static ThreadLocalKey in_malloc_hook_flag_;
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(MallocHookScope);
 };
 
-// AllocationInfo contains all information related to a given allocation
-// including:
-//   -Allocation size in bytes
-//   -Stack trace corresponding to the location of allocation, if applicable
-class AllocationInfo {
- public:
-  explicit AllocationInfo(intptr_t allocation_size)
-      : sample_(NULL), allocation_size_(allocation_size) {
-    // Stack trace collection is disabled when we are in the process of creating
-    // the first OSThread in order to prevent deadlocks.
-    if (MallocHooksState::ProfilingEnabled() &&
-        MallocHooksState::stack_trace_collection_enabled()) {
-      sample_ = Profiler::SampleNativeAllocation(kSkipCount);
-    }
-  }
-
-  Sample* sample() const { return sample_; }
-  intptr_t allocation_size() const { return allocation_size_; }
-
- private:
-  Sample* sample_;
-  intptr_t allocation_size_;
-
-  // The number of frames that are generated by the malloc hooks and collection
-  // of the stack trace. These frames are ignored when collecting the stack
-  // trace for a memory allocation. If this number is incorrect, some tests in
-  // malloc_hook_tests.cc might fail, particularily
-  // StackTraceMallocHookLengthTest. If this value is updated, please make sure
-  // that the MallocHooks test cases pass on all platforms.
-  static const intptr_t kSkipCount = 5;
-};
-
 
 // Custom key/value trait specifically for address/size pairs. Unlike
 // RawPointerKeyValueTrait, the default value is -1 as 0 can be a valid entry.
-class AddressKeyValueTrait : public AllStatic {
+class AddressKeyValueTrait {
  public:
   typedef const void* Key;
-  typedef AllocationInfo* Value;
+  typedef intptr_t Value;
 
   struct Pair {
     Key key;
     Value value;
-    Pair() : key(NULL), value(NULL) {}
+    Pair() : key(NULL), value(-1) {}
     Pair(const Key key, const Value& value) : key(key), value(value) {}
     Pair(const Pair& other) : key(other.key), value(other.value) {}
   };
 
   static Key KeyOf(Pair kv) { return kv.key; }
   static Value ValueOf(Pair kv) { return kv.value; }
   static intptr_t Hashcode(Key key) { return reinterpret_cast<intptr_t>(key); }
   static bool IsKeyEqual(Pair kv, Key key) { return kv.key == key; }
 };
 
 
 // Map class that will be used to store mappings between ptr -> allocation size.
 class AddressMap : public MallocDirectChainedHashMap<AddressKeyValueTrait> {
  public:
   typedef AddressKeyValueTrait::Key Key;
   typedef AddressKeyValueTrait::Value Value;
   typedef AddressKeyValueTrait::Pair Pair;
 
-  virtual ~AddressMap() { Clear(); }
-
-  void Insert(const Key& key, const Value& value) {
+  inline void Insert(const Key& key, const Value& value) {
     Pair pair(key, value);
     MallocDirectChainedHashMap<AddressKeyValueTrait>::Insert(pair);
   }
 
-  bool Lookup(const Key& key, Value* value) {
+  inline bool Lookup(const Key& key, Value* value) {
     ASSERT(value != NULL);
     Pair* pair = MallocDirectChainedHashMap<AddressKeyValueTrait>::Lookup(key);
     if (pair == NULL) {
       return false;
     } else {
       *value = pair->value;
       return true;
     }
   }
-
-  void Clear() {
-    Iterator iter = GetIterator();
-    Pair* result = iter.Next();
-    while (result != NULL) {
-      delete result->value;
-      result->value = NULL;
-      result = iter.Next();
-    }
-    MallocDirectChainedHashMap<AddressKeyValueTrait>::Clear();
-  }
 };
 
 
+class MallocHooksState : public AllStatic {
+ public:
+  static void RecordAllocHook(const void* ptr, size_t size);
+  static void RecordFreeHook(const void* ptr);
+
+  static bool Active() { return active_; }
+  static void Init() {
+    address_map_ = new AddressMap();
+    active_ = true;
+    original_pid_ = OS::ProcessId();
+  }
+
+  static bool IsOriginalProcess() {
+    ASSERT(original_pid_ != kInvalidPid);
+    return original_pid_ == OS::ProcessId();
+  }
+
+  static Mutex* malloc_hook_mutex() { return malloc_hook_mutex_; }
+
+  static intptr_t allocation_count() { return allocation_count_; }
+
+  static intptr_t heap_allocated_memory_in_bytes() {
+    return heap_allocated_memory_in_bytes_;
+  }
+
+  static void IncrementHeapAllocatedMemoryInBytes(intptr_t size) {
+    ASSERT(malloc_hook_mutex()->IsOwnedByCurrentThread());
+    ASSERT(size >= 0);
+    heap_allocated_memory_in_bytes_ += size;
+    ++allocation_count_;
+  }
+
+  static void DecrementHeapAllocatedMemoryInBytes(intptr_t size) {
+    ASSERT(malloc_hook_mutex()->IsOwnedByCurrentThread());
+    ASSERT(size >= 0);
+    ASSERT(heap_allocated_memory_in_bytes_ >= size);
+    heap_allocated_memory_in_bytes_ -= size;
+    --allocation_count_;
+    ASSERT(allocation_count_ >= 0);
+  }
+
+  static AddressMap* address_map() { return address_map_; }
+
+  static void ResetStats() {
+    ASSERT(malloc_hook_mutex()->IsOwnedByCurrentThread());
+    allocation_count_ = 0;
+    heap_allocated_memory_in_bytes_ = 0;
+    address_map_->Clear();
+  }
+
+  static void TearDown() {
+    ASSERT(malloc_hook_mutex()->IsOwnedByCurrentThread());
+    active_ = false;
+    original_pid_ = kInvalidPid;
+    ResetStats();
+    delete address_map_;
+  }
+
+ private:
+  static bool active_;
+  static intptr_t original_pid_;
+  static Mutex* malloc_hook_mutex_;
+  static intptr_t allocation_count_;
+  static intptr_t heap_allocated_memory_in_bytes_;
+  static AddressMap* address_map_;
+
+  static const intptr_t kInvalidPid = -1;
+};
+
+
 // MallocHookScope state.
 Mutex* MallocHookScope::malloc_hook_scope_mutex_ = new Mutex();
 ThreadLocalKey MallocHookScope::in_malloc_hook_flag_ = kUnsetThreadLocalKey;
 
 // MallocHooks state / locks.
 bool MallocHooksState::active_ = false;
-bool MallocHooksState::stack_trace_collection_enabled_ = false;
 intptr_t MallocHooksState::original_pid_ = MallocHooksState::kInvalidPid;
 Mutex* MallocHooksState::malloc_hook_mutex_ = new Mutex();
 
 // Memory allocation state information.
 intptr_t MallocHooksState::allocation_count_ = 0;
 intptr_t MallocHooksState::heap_allocated_memory_in_bytes_ = 0;
 AddressMap* MallocHooksState::address_map_ = NULL;
 
 
-void MallocHooksState::Init() {
-  address_map_ = new AddressMap();
-  active_ = true;
-#if defined(DEBUG)
-  stack_trace_collection_enabled_ = true;
-#else
-  stack_trace_collection_enabled_ = false;
-#endif  // defined(DEBUG)
-  original_pid_ = OS::ProcessId();
-}
-
-
-void MallocHooksState::ResetStats() {
-  ASSERT(malloc_hook_mutex()->IsOwnedByCurrentThread());
-  allocation_count_ = 0;
-  heap_allocated_memory_in_bytes_ = 0;
-  address_map_->Clear();
-}
-
-
-void MallocHooksState::TearDown() {
-  ASSERT(malloc_hook_mutex()->IsOwnedByCurrentThread());
-  active_ = false;
-  original_pid_ = kInvalidPid;
-  ResetStats();
-  delete address_map_;
-  address_map_ = NULL;
-}
-
-
 void MallocHooks::InitOnce() {
   if (!FLAG_enable_malloc_hooks) {
     return;
   }
   MutexLocker ml(MallocHooksState::malloc_hook_mutex());
   ASSERT(!MallocHooksState::Active());
 
   MallocHookScope::InitMallocHookFlag();
   MallocHooksState::Init();
 
@@ skipping 18 matching lines @@
   success = MallocHook::RemoveNewHook(&MallocHooksState::RecordAllocHook);
   ASSERT(success);
   success = MallocHook::RemoveDeleteHook(&MallocHooksState::RecordFreeHook);
   ASSERT(success);
 
   MallocHooksState::TearDown();
   MallocHookScope::DestroyMallocHookFlag();
 }
 
 
-bool MallocHooks::ProfilingEnabled() {
-  return MallocHooksState::ProfilingEnabled();
-}
-
-
-bool MallocHooks::stack_trace_collection_enabled() {
-  MutexLocker ml(MallocHooksState::malloc_hook_mutex());
-  return MallocHooksState::stack_trace_collection_enabled();
-}
-
-
-void MallocHooks::set_stack_trace_collection_enabled(bool enabled) {
-  MutexLocker ml(MallocHooksState::malloc_hook_mutex());
-  MallocHooksState::set_stack_trace_collection_enabled(enabled);
-}
-
-
 void MallocHooks::ResetStats() {
   if (!FLAG_enable_malloc_hooks) {
     return;
   }
-  // Set the malloc hook flag before completing the reset since ResetStats()
-  // frees memory.
-  MallocHookScope mhs;
   MutexLocker ml(MallocHooksState::malloc_hook_mutex());
   if (MallocHooksState::Active()) {
     MallocHooksState::ResetStats();
   }
 }
 
 
 bool MallocHooks::Active() {
   if (!FLAG_enable_malloc_hooks) {
     return false;
   }
-  MutexLocker ml(MallocHooksState::malloc_hook_mutex());
+  ASSERT(MallocHooksState::malloc_hook_mutex()->IsOwnedByCurrentThread());
   return MallocHooksState::Active();
 }
 
 
 void MallocHooks::PrintToJSONObject(JSONObject* jsobj) {
   if (!FLAG_enable_malloc_hooks) {
     return;
   }
   intptr_t allocated_memory = 0;
   intptr_t allocation_count = 0;
   bool add_usage = false;
   // AddProperty may call malloc which would result in an attempt
   // to acquire the lock recursively so we extract the values first
   // and then add the JSON properties.
   {
     MutexLocker ml(MallocHooksState::malloc_hook_mutex());
-    if (MallocHooksState::Active()) {
+    if (Active()) {
       allocated_memory = MallocHooksState::heap_allocated_memory_in_bytes();
       allocation_count = MallocHooksState::allocation_count();
       add_usage = true;
     }
   }
   if (add_usage) {
     jsobj->AddProperty("_heapAllocatedMemoryUsage", allocated_memory);
     jsobj->AddProperty("_heapAllocationCount", allocation_count);
   }
 }
@@ skipping 10 matching lines @@
 
 intptr_t MallocHooks::heap_allocated_memory_in_bytes() {
   if (!FLAG_enable_malloc_hooks) {
     return 0;
   }
   MutexLocker ml(MallocHooksState::malloc_hook_mutex());
   return MallocHooksState::heap_allocated_memory_in_bytes();
 }
 
 
-Sample* MallocHooks::GetSample(const void* ptr) {
-  MutexLocker ml(MallocHooksState::malloc_hook_mutex());
-  ASSERT(MallocHooksState::Active());
-
-  if (ptr != NULL) {
-    AllocationInfo* allocation_info = NULL;
-    if (MallocHooksState::address_map()->Lookup(ptr, &allocation_info)) {
-      ASSERT(allocation_info != NULL);
-      return allocation_info->sample();
-    }
-  }
-  return NULL;
-}
-
-
 void MallocHooksState::RecordAllocHook(const void* ptr, size_t size) {
   if (MallocHookScope::IsInHook() || !MallocHooksState::IsOriginalProcess()) {
     return;
   }
 
   MutexLocker ml(MallocHooksState::malloc_hook_mutex());
   // Now that we hold the lock, check to make sure everything is still active.
   if ((ptr != NULL) && MallocHooksState::Active()) {
     // Set the malloc hook flag to avoid calling hooks again if memory is
     // allocated/freed below.
     MallocHookScope mhs;
     MallocHooksState::IncrementHeapAllocatedMemoryInBytes(size);
-    MallocHooksState::address_map()->Insert(ptr, new AllocationInfo(size));
+    MallocHooksState::address_map()->Insert(ptr, size);
   }
 }
 
 
 void MallocHooksState::RecordFreeHook(const void* ptr) {
   if (MallocHookScope::IsInHook() || !MallocHooksState::IsOriginalProcess()) {
     return;
   }
 
   MutexLocker ml(MallocHooksState::malloc_hook_mutex());
   // Now that we hold the lock, check to make sure everything is still active.
   if ((ptr != NULL) && MallocHooksState::Active()) {
-    AllocationInfo* allocation_info = NULL;
-    if (MallocHooksState::address_map()->Lookup(ptr, &allocation_info)) {
-      MallocHooksState::DecrementHeapAllocatedMemoryInBytes(
-          allocation_info->allocation_size());
+    // Set the malloc hook flag to avoid calling hooks again if memory is
+    // allocated/freed below.
+    MallocHookScope mhs;
+    intptr_t size = 0;
+    if (MallocHooksState::address_map()->Lookup(ptr, &size)) {
+      MallocHooksState::DecrementHeapAllocatedMemoryInBytes(size);
       MallocHooksState::address_map()->Remove(ptr);
-      delete allocation_info;
     }
   }
 }
 
 }  // namespace dart
 
-#endif  // defined(DART_USE_TCMALLOC) && !defined(PRODUCT) &&
-        // !defined(TARGET_ARCH_DBC) && !defined(TARGET_OS_FUCHSIA)
+#endif  // defined(DART_USE_TCMALLOC) && !defined(PRODUCT)