Improve hot reload test mode

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 "include/dart_native_api.h"
 #include "platform/assert.h"
 #include "platform/text_buffer.h"
@@ skipping 35 matching lines @@
 #include "vm/timeline_analysis.h"
 #include "vm/timer.h"
 #include "vm/visitor.h"
 
 
 namespace dart {
 
 DECLARE_FLAG(bool, print_metrics);
 DECLARE_FLAG(bool, timing);
 DECLARE_FLAG(bool, trace_service);
+DECLARE_FLAG(bool, warn_on_pause_with_no_debugger);
+
+// Reload flags.
+DECLARE_FLAG(bool, check_reloaded);
+DECLARE_FLAG(int, reload_every);
+DECLARE_FLAG(bool, reload_every_back_off);
 DECLARE_FLAG(bool, trace_reload);
-DECLARE_FLAG(bool, warn_on_pause_with_no_debugger);
-DECLARE_FLAG(bool, check_reloaded);
+
 
 NOT_IN_PRODUCT(
 static void CheckedModeHandler(bool value) {
   FLAG_enable_asserts = value;
   FLAG_enable_type_checks = value;
 }
 
 // --enable-checked-mode and --checked both enable checked mode which is
 // equivalent to setting --enable-asserts and --enable-type-checks.
 DEFINE_FLAG_HANDLER(CheckedModeHandler,
@@ skipping 757 matching lines @@
       next_(NULL),
       pause_loop_monitor_(NULL),
       loading_invalidation_gen_(kInvalidGen),
       top_level_parsing_count_(0),
       field_list_mutex_(new Mutex()),
       boxed_field_list_(GrowableObjectArray::null()),
       spawn_count_monitor_(new Monitor()),
       spawn_count_(0),
       has_attempted_reload_(false),
       no_reload_scope_depth_(0),
+      reload_every_n_stack_overflow_checks_(FLAG_reload_every),
       reload_context_(NULL) {
   NOT_IN_PRODUCT(FlagsCopyFrom(api_flags));
   // TODO(asiva): A Thread is not available here, need to figure out
   // how the vm_tag (kEmbedderTagId) can be set, these tags need to
   // move to the OSThread structure.
   set_user_tag(UserTags::kDefaultUserTag);
 }
 
 #undef REUSABLE_HANDLE_SCOPE_INIT
 #undef REUSABLE_HANDLE_INITIALIZERS
@@ skipping 790 matching lines @@
 
 
 void Isolate::StopBackgroundCompiler() {
   // Wait until all background compilation has finished.
   if (background_compiler_ != NULL) {
     BackgroundCompiler::Stop(this);
   }
 }
 
 
+void Isolate::MaybeIncreaseReloadEveryNStackOverflowChecks() {
+  if (FLAG_reload_every_back_off) {
+    if (reload_every_n_stack_overflow_checks_ < 5000) {
+      reload_every_n_stack_overflow_checks_ += 100;
+    } else {
+      reload_every_n_stack_overflow_checks_ *= 2;
+    }
+    // Cap the value.
+    if (reload_every_n_stack_overflow_checks_ > 1000000) {
+      reload_every_n_stack_overflow_checks_ = 1000000;
+    }
+  }
+}
+
+
 void Isolate::Shutdown() {
   ASSERT(this == Isolate::Current());
   StopBackgroundCompiler();
 
 #if defined(DEBUG)
   if (heap_ != NULL) {
     // The VM isolate keeps all objects marked.
     heap_->Verify(this == Dart::vm_isolate() ? kRequireMarked : kForbidMarked);
   }
 #endif  // DEBUG
@@ skipping 1175 matching lines @@
 void IsolateSpawnState::DecrementSpawnCount() {
   ASSERT(spawn_count_monitor_ != NULL);
   ASSERT(spawn_count_ != NULL);
   MonitorLocker ml(spawn_count_monitor_);
   ASSERT(*spawn_count_ > 0);
   *spawn_count_ = *spawn_count_ - 1;
   ml.Notify();
 }
 
 }  // namespace dart