Re-landing of "replace TrySync with Metadata".

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"
@@ skipping 110 matching lines @@
   ~NoReloadScope();
 
  private:
   Isolate* isolate_;
   DISALLOW_COPY_AND_ASSIGN(NoReloadScope);
 };
 
 
 // Fixed cache for exception handler lookup.
 typedef FixedCache<intptr_t, ExceptionHandlerInfo, 16> HandlerInfoCache;
+// Fixed cache for catch entry state lookup.
+typedef FixedCache<intptr_t, CatchEntryState, 16> CatchEntryStateCache;
 
 // List of Isolate flags with corresponding members of Dart_IsolateFlags and
 // corresponding global command line flags.
 //
 //       V(name, Dart_IsolateFlags-member-name, command-line-flag-name)
 //
 #define ISOLATE_FLAG_LIST(V)                                                   \
   V(type_checks, enable_type_checks, FLAG_enable_type_checks)                  \
   V(asserts, enable_asserts, FLAG_enable_asserts)                              \
   V(error_on_bad_type, enable_error_on_bad_type, FLAG_error_on_bad_type)       \
@@ skipping 527 matching lines @@
   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_; }
 
+  CatchEntryStateCache* catch_entry_state_cache() {
+    return &catch_entry_state_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 175 matching lines @@
   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_;
+  CatchEntryStateCache catch_entry_state_cache_;
 
   static Dart_IsolateCreateCallback create_callback_;
   static Dart_IsolateShutdownCallback shutdown_callback_;
   static Dart_IsolateCleanupCallback cleanup_callback_;
 
   static void WakePauseEventHandler(Dart_Isolate isolate);
 
   // Manage list of existing isolates.
   static bool AddIsolateToList(Isolate* isolate);
   static void RemoveIsolateFromList(Isolate* isolate);
@@ skipping 145 matching lines @@
   intptr_t* spawn_count_;
 
   Dart_IsolateFlags isolate_flags_;
   bool paused_;
   bool errors_are_fatal_;
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_ISOLATE_H_