First step toward deoptimization using deoptimization info: splits deoptimization into two steps: c…

runtime/vm/object.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/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
@@ skipping 3617 matching lines @@
 
 
 void Function::SetCode(const Code& value) const {
   StorePointer(&raw_ptr()->code_, value.raw());
   ASSERT(Function::Handle(value.function()).IsNull() ||
     (value.function() == this->raw()));
   value.set_function(*this);
 }
 
 
+void Function::SwitchToUnoptimizedCode() const {
+  ASSERT(HasOptimizedCode());
+  // Patch entry of the optimized code.
+  CodePatcher::PatchEntry(Code::Handle(CurrentCode()));
+  // Use previously compiled unoptimized code.
+  SetCode(Code::Handle(unoptimized_code()));
+  CodePatcher::RestoreEntry(Code::Handle(unoptimized_code()));
+}
+
+
 void Function::set_unoptimized_code(const Code& value) const {
   StorePointer(&raw_ptr()->unoptimized_code_, value.raw());
 }
 
 
 void Function::set_context_scope(const ContextScope& value) const {
   StorePointer(&raw_ptr()->context_scope_, value.raw());
 }
 
 
@@ skipping 7213 matching lines @@
   const String& str = String::Handle(pattern());
   const char* format = "JSRegExp: pattern=%s flags=%s";
   intptr_t len = OS::SNPrint(NULL, 0, format, str.ToCString(), Flags());
   char* chars = reinterpret_cast<char*>(
       Isolate::Current()->current_zone()->Allocate(len + 1));
   OS::SNPrint(chars, (len + 1), format, str.ToCString(), Flags());
   return chars;
 }
 
 }  // namespace dart