Sampling profiler

runtime/vm/isolate.cc

 // Copyright (c) 2013, 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 "vm/isolate.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/json.h"
 #include "lib/mirrors.h"
 #include "vm/code_observers.h"
 #include "vm/compiler_stats.h"
 #include "vm/coverage.h"
 #include "vm/dart_api_state.h"
 #include "vm/dart_entry.h"
 #include "vm/debugger.h"
 #include "vm/deopt_instructions.h"
 #include "vm/heap.h"
 #include "vm/heap_histogram.h"
 #include "vm/message_handler.h"
 #include "vm/object_id_ring.h"
 #include "vm/object_store.h"
 #include "vm/parser.h"
 #include "vm/port.h"
+#include "vm/profiler.h"
 #include "vm/reusable_handles.h"
 #include "vm/service.h"
+#include "vm/signal_handler.h"
 #include "vm/simulator.h"
 #include "vm/stack_frame.h"
 #include "vm/stub_code.h"
 #include "vm/symbols.h"
 #include "vm/thread.h"
 #include "vm/timer.h"
 #include "vm/visitor.h"
 
 
 namespace dart {
@@ skipping 265 matching lines @@
       spawn_data_(0),
       is_runnable_(false),
       gc_prologue_callbacks_(),
       gc_epilogue_callbacks_(),
       defer_finalization_count_(0),
       deopt_context_(NULL),
       stacktrace_(NULL),
       stack_frame_index_(-1),
       object_histogram_(NULL),
       object_id_ring_(NULL),
+      profiler_data_(NULL),
+      profiler_data_mutex_(new Mutex()),
       REUSABLE_HANDLE_LIST(REUSABLE_HANDLE_INITIALIZERS)
       reusable_handles_() {
   if (FLAG_print_object_histogram && (Dart::vm_isolate() != NULL)) {
     object_histogram_ = new ObjectHistogram(this);
   }
 }
 #undef REUSABLE_HANDLE_INITIALIZERS
 
 
 Isolate::~Isolate() {
   delete [] name_;
   delete heap_;
   delete object_store_;
   delete api_state_;
   delete stub_code_;
   delete debugger_;
 #if defined(USING_SIMULATOR)
   delete simulator_;
 #endif
   delete mutex_;
   mutex_ = NULL;  // Fail fast if interrupts are scheduled on a dead isolate.
+  delete profiler_data_mutex_;
+  profiler_data_mutex_ = NULL;
   delete message_handler_;
   message_handler_ = NULL;  // Fail fast if we send messages to a dead isolate.
   ASSERT(deopt_context_ == NULL);  // No deopt in progress when isolate deleted.
   delete object_histogram_;
 }
 
 void Isolate::SetCurrent(Isolate* current) {
+  ScopedSignalBlocker ssb;
+  Isolate* old_isolate = Current();
+  if (old_isolate != NULL) {
+    ProfilerManager::DescheduleIsolate(old_isolate);
+  }
   Thread::SetThreadLocal(isolate_key, reinterpret_cast<uword>(current));
+  if (current != NULL) {
+    ProfilerManager::ScheduleIsolate(current);
+  }
 }
 
 
 // The single thread local key which stores all the thread local data
 // for a thread. Since an Isolate is the central repository for
 // storing all isolate specific information a single thread local key
 // is sufficient.
 ThreadLocalKey Isolate::isolate_key = Thread::kUnsetThreadLocalKey;
 
 
@@ skipping 39 matching lines @@
   result->BuildName(name_prefix);
 
   result->debugger_ = new Debugger();
   result->debugger_->Initialize(result);
   if (FLAG_trace_isolates) {
     if (name_prefix == NULL || strcmp(name_prefix, "vm-isolate") != 0) {
       OS::Print("[+] Starting isolate:\n"
                 "\tisolate:    %s\n", result->name());
     }
   }
+
+  // Setup for profiling.
+  ProfilerManager::SetupIsolateForProfiling(result);
+
   return result;
 }
 
 
 void Isolate::BuildName(const char* name_prefix) {
   ASSERT(name_ == NULL);
   if (name_prefix == NULL) {
     name_prefix = "isolate";
   }
   const char* kFormat = "%s-%lld";
@@ skipping 27 matching lines @@
 void Isolate::SetStackLimit(uword limit) {
   MutexLocker ml(mutex_);
   if (stack_limit_ == saved_stack_limit_) {
     // No interrupt pending, set stack_limit_ too.
     stack_limit_ = limit;
   }
   saved_stack_limit_ = limit;
 }
 
 
+bool Isolate::GetStackBounds(uintptr_t* lower, uintptr_t* upper) {
+  uintptr_t stack_lower = stack_limit();
+  if (stack_lower == static_cast<uintptr_t>(~0)) {
+    stack_lower = saved_stack_limit();
+  }
+  if (stack_lower == static_cast<uintptr_t>(~0)) {
+    return false;
+  }
+  uintptr_t stack_upper = stack_lower + GetSpecifiedStackSize();
+  *lower = stack_lower;
+  *upper = stack_upper;
+  return true;
+}
+
+
 void Isolate::ScheduleInterrupts(uword interrupt_bits) {
   // TODO(turnidge): Can't use MutexLocker here because MutexLocker is
   // a StackResource, which requires a current isolate.  Should
   // MutexLocker really be a StackResource?
   mutex_->Lock();
   ASSERT((interrupt_bits & ~kInterruptsMask) == 0);  // Must fit in mask.
   if (stack_limit_ == saved_stack_limit_) {
     stack_limit_ = (~static_cast<uword>(0)) & ~kInterruptsMask;
   }
   stack_limit_ |= interrupt_bits;
@@ skipping 210 matching lines @@
   ASSERT(this == Isolate::Current());
   ASSERT(top_resource() == NULL);
   ASSERT((heap_ == NULL) || heap_->Verify());
 
   // Create an area where we do have a zone and a handle scope so that we can
   // call VM functions while tearing this isolate down.
   {
     StackZone stack_zone(this);
     HandleScope handle_scope(this);
 
+    ScopedSignalBlocker ssb;
+
+    ProfilerManager::DescheduleIsolate(this);
+
+    // ProfilerManager::WriteTracing(this, this->name(), this->main_port());

[siva, 2013/11/11 03:51:54]

why is this commented out?

[Cutch, 2013/11/18 20:48:54]

Was for debugging. Removed.

+
+
     if (FLAG_print_object_histogram) {
       heap()->CollectAllGarbage();
       object_histogram()->Print();
     }
 
     // Clean up debugger resources.
     debugger()->Shutdown();
 
     // Close all the ports owned by this isolate.
     PortMap::ClosePorts(message_handler());
@@ skipping 21 matching lines @@
       megamorphic_cache_table()->PrintSizes();
       Symbols::DumpStats();
       OS::Print("[-] Stopping isolate:\n"
                 "\tisolate:    %s\n", name());
     }
   }
 
   // TODO(5411455): For now just make sure there are no current isolates
   // as we are shutting down the isolate.
   SetCurrent(NULL);
+  ProfilerManager::ShutdownIsolateForProfiling(this);
 }
 
 
 Dart_IsolateCreateCallback Isolate::create_callback_ = NULL;
 Dart_IsolateInterruptCallback Isolate::interrupt_callback_ = NULL;
 Dart_IsolateUnhandledExceptionCallback
     Isolate::unhandled_exception_callback_ = NULL;
 Dart_IsolateShutdownCallback Isolate::shutdown_callback_ = NULL;
 Dart_FileOpenCallback Isolate::file_open_callback_ = NULL;
 Dart_FileReadCallback Isolate::file_read_callback_ = NULL;
@@ skipping 332 matching lines @@
   return func.raw();
 }
 
 
 void IsolateSpawnState::Cleanup() {
   SwitchIsolateScope switch_scope(isolate());
   Dart::ShutdownIsolate();
 }
 
 }  // namespace dart