[heap] Introduce enum of garbage collection reasons.

src/debug/debug.cc

 // Copyright 2012 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.
 
 #include "src/debug/debug.h"
 
 #include <memory>
 
 #include "src/api.h"
 #include "src/arguments.h"
@@ skipping 1264 matching lines @@
   // for which no JSFunction exists.
   {
     SharedFunctionInfo::Iterator iterator(isolate_);
     while (SharedFunctionInfo* shared = iterator.Next()) {
       shared->ClearCodeFromOptimizedCodeMap();
     }
   }
 
   // Make sure we abort incremental marking.
   isolate_->heap()->CollectAllGarbage(Heap::kMakeHeapIterableMask,
-                                      "prepare for break points");
+                                      GarbageCollectionReason::kDebugger);
 
   DCHECK(shared->is_compiled());
   bool baseline_exists = shared->HasBaselineCode();
 
   {
     // TODO(yangguo): with bytecode, we still walk the heap to find all
     // optimized code for the function to deoptimize. We can probably be
     // smarter here and avoid the heap walk.
     HeapIterator iterator(isolate_->heap());
     HeapObject* obj;
@@ skipping 296 matching lines @@
 
 
 void Debug::ClearMirrorCache() {
   PostponeInterruptsScope postpone(isolate_);
   HandleScope scope(isolate_);
   CallFunction("ClearMirrorCache", 0, NULL);
 }
 
 
 Handle<FixedArray> Debug::GetLoadedScripts() {
-  isolate_->heap()->CollectAllGarbage();
+  isolate_->heap()->CollectAllGarbage(Heap::kFinalizeIncrementalMarkingMask,
+                                      GarbageCollectionReason::kDebugger);
   Factory* factory = isolate_->factory();
   if (!factory->script_list()->IsWeakFixedArray()) {
     return factory->empty_fixed_array();
   }
   Handle<WeakFixedArray> array =
       Handle<WeakFixedArray>::cast(factory->script_list());
   Handle<FixedArray> results = factory->NewFixedArray(array->Length());
   int length = 0;
   {
     Script::Iterator iterator(isolate_);
@@ skipping 953 matching lines @@
 }
 
 
 void LockingCommandMessageQueue::Clear() {
   base::LockGuard<base::Mutex> lock_guard(&mutex_);
   queue_.Clear();
 }
 
 }  // namespace internal
 }  // namespace v8