Add exception handler cache to isolate

runtime/vm/exceptions.h

 // Copyright (c) 2011, 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_EXCEPTIONS_H_
 #define RUNTIME_VM_EXCEPTIONS_H_
 
 #include "vm/allocation.h"
 #include "vm/token_position.h"
 
@@ skipping 72 matching lines @@
   static void JumpToFrame(Thread* thread,
                           uword program_counter,
                           uword stack_pointer,
                           uword frame_pointer,
                           bool clear_deopt_at_target);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Exceptions);
 };
 
+// The index into the ExceptionHandlers table corresponds to
+// the try_index of the handler.
+struct HandlerInfo {
+  uint32_t handler_pc_offset;  // PC offset value of handler.
+  int16_t outer_try_index;     // Try block index of enclosing try block.
+  int8_t needs_stacktrace;     // True if a stacktrace is needed.
+  int8_t has_catch_all;        // Catches all exceptions.
+};
+
 }  // namespace dart
 
 #endif  // RUNTIME_VM_EXCEPTIONS_H_