Pass around the current isolate in exception handling code.

runtime/vm/stack_frame.cc

 // Copyright (c) 2012, 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/stack_frame.h"
 
 #include "vm/assembler.h"
 #include "vm/deopt_instructions.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/os.h"
 #include "vm/parser.h"
 #include "vm/raw_object.h"
+#include "vm/reusable_handles.h"
 #include "vm/stub_code.h"
 #include "vm/visitor.h"
 
 namespace dart {
 
 
 bool StackFrame::IsStubFrame() const {
   ASSERT(!(IsEntryFrame() || IsExitFrame()));
   uword saved_pc =
       *(reinterpret_cast<uword*>(fp() + (kPcMarkerSlotFromFp * kWordSize)));
@@ skipping 164 matching lines @@
         (pc_marker - Assembler::kEntryPointToPcMarkerOffset);
     RawInstructions* instr = Instructions::FromEntryPoint(entry_point);
     if (instr != Instructions::null()) {
       return instr->ptr()->code_;
     }
   }
   return Code::null();
 }
 
 
-bool StackFrame::FindExceptionHandler(uword* handler_pc,
+bool StackFrame::FindExceptionHandler(Isolate* isolate,
+                                      uword* handler_pc,
                                       bool* needs_stacktrace,
                                       bool* has_catch_all) const {
-  Isolate* isolate = Isolate::Current();
-  Code& code = Code::Handle(isolate, LookupDartCode());
+  REUSABLE_CODE_HANDLESCOPE(isolate);
+  Code& code = reused_code_handle.Handle();
+  code = LookupDartCode();
   if (code.IsNull()) {
     return false;  // Stub frames do not have exception handlers.
   }
 
-  ExceptionHandlers& handlers =
-      ExceptionHandlers::Handle(isolate, code.exception_handlers());
+  REUSABLE_EXCEPTION_HANDLERS_HANDLESCOPE(isolate);
+  ExceptionHandlers& handlers = reused_exception_handlers_handle.Handle();
+  handlers = code.exception_handlers();
   if (handlers.Length() == 0) {
     return false;
   }
+
   // Find pc descriptor for the current pc.
-  const PcDescriptors& descriptors =
-      PcDescriptors::Handle(isolate, code.pc_descriptors());
+  REUSABLE_PC_DESCRIPTORS_HANDLESCOPE(isolate);
+  PcDescriptors& descriptors = reused_pc_descriptors_handle.Handle();
+  descriptors = code.pc_descriptors();
   const intptr_t len = descriptors.Length();
   for (intptr_t i = 0; i < len; i++) {
     if ((static_cast<uword>(descriptors.PC(i)) == pc()) &&
         (descriptors.TryIndex(i) != -1)) {
       const intptr_t try_index = descriptors.TryIndex(i);
       RawExceptionHandlers::HandlerInfo handler_info;
       handlers.GetHandlerInfo(try_index, &handler_info);
       *handler_pc = handler_info.handler_pc;
       *needs_stacktrace = handler_info.needs_stacktrace;
       *has_catch_all = handler_info.has_catch_all;
@@ skipping 224 matching lines @@
     if (deopt_instr->kind() == DeoptInstr::kCallerFp) {
       return (index - num_materializations_);
     }
   }
   UNREACHABLE();
   return 0;
 }
 
 
 }  // namespace dart