Add exception handler cache to isolate

runtime/vm/isolate.h

 // 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.
 
 #ifndef RUNTIME_VM_ISOLATE_H_
 #define RUNTIME_VM_ISOLATE_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/atomic.h"
 #include "vm/base_isolate.h"
 #include "vm/class_table.h"
+#include "vm/exceptions.h"
+#include "vm/fixed_cache.h"
 #include "vm/handles.h"
 #include "vm/megamorphic_cache_table.h"
 #include "vm/metrics.h"
 #include "vm/random.h"
 #include "vm/tags.h"
 #include "vm/thread.h"
 #include "vm/os_thread.h"
 #include "vm/timer.h"
 #include "vm/token_position.h"
 #include "vm/growable_array.h"
@@ skipping 94 matching lines @@
  public:
   NoReloadScope(Isolate* isolate, Thread* thread);
   ~NoReloadScope();
 
  private:
   Isolate* isolate_;
   DISALLOW_COPY_AND_ASSIGN(NoReloadScope);
 };
 
 
+// Fixed cache for exception handler lookup.
+typedef FixedCache<intptr_t, HandlerInfo, 16> HandlerInfoCache;
+
+
 class Isolate : public BaseIsolate {
  public:
   // Keep both these enums in sync with isolate_patch.dart.
   // The different Isolate API message types.
   enum LibMsgId {
     kPauseMsg = 1,
     kResumeMsg = 2,
     kPingMsg = 3,
     kKillMsg = 4,
     kAddExitMsg = 5,
@@ skipping 498 matching lines @@
   static void DisableIsolateCreation();
   static void EnableIsolateCreation();
   static bool IsolateCreationEnabled();
 
   void StopBackgroundCompiler();
 
   intptr_t reload_every_n_stack_overflow_checks() const {
     return reload_every_n_stack_overflow_checks_;
   }
 
+  HandlerInfoCache* handler_info_cache() { return &handler_info_cache_; }
+
   void MaybeIncreaseReloadEveryNStackOverflowChecks();
 
  private:
   friend class Dart;                  // Init, InitOnce, Shutdown.
   friend class IsolateKillerVisitor;  // Kill().
 
   explicit Isolate(const Dart_IsolateFlags& api_flags);
 
   static void InitOnce();
   static Isolate* Init(const char* name_prefix,
@@ skipping 174 matching lines @@
   // Has a reload ever been attempted?
   bool has_attempted_reload_;
   intptr_t no_reload_scope_depth_;  // we can only reload when this is 0.
   // Per-isolate copy of FLAG_reload_every.
   intptr_t reload_every_n_stack_overflow_checks_;
   IsolateReloadContext* reload_context_;
   int64_t last_reload_timestamp_;
   // Should we pause in the debug message loop after this request?
   bool should_pause_post_service_request_;
 
+  HandlerInfoCache handler_info_cache_;
+
   static Dart_IsolateCreateCallback create_callback_;
   static Dart_IsolateShutdownCallback shutdown_callback_;
 
   static void WakePauseEventHandler(Dart_Isolate isolate);
 
   // Manage list of existing isolates.
   static bool AddIsolateToList(Isolate* isolate);
   static void RemoveIsolateFromList(Isolate* isolate);
 
   // This monitor protects isolates_list_head_, and creation_enabled_.
@@ skipping 143 matching lines @@
   intptr_t* spawn_count_;
 
   Dart_IsolateFlags isolate_flags_;
   bool paused_;
   bool errors_are_fatal_;
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_ISOLATE_H_