Cleanup: we are not patching entries any longer

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/cpu.h"
@@ skipping 3734 matching lines @@
   ASSERT(raw_ptr()->allocation_stub_ == Code::null());
   StorePointer(&raw_ptr()->allocation_stub_, value.raw());
 }
 
 
 void Class::DisableAllocationStub() const {
   const Code& existing_stub = Code::Handle(allocation_stub());
   if (existing_stub.IsNull()) {
     return;
   }
-  ASSERT(!CodePatcher::IsEntryPatched(existing_stub));
-  // Patch the stub so that the next caller will regenerate the stub.
-  CodePatcher::PatchEntry(
-      existing_stub,
-      Code::Handle(StubCode::FixAllocationStubTarget_entry()->code()));
+  ASSERT(!existing_stub.IsDisabled());
+  // Change the stub so that the next caller will regenerate the stub.
+  existing_stub.DisableStubCode();
   // Disassociate the existing stub from class.
   StorePointer(&raw_ptr()->allocation_stub_, Code::null());
 }
 
 
 bool Class::IsFunctionClass() const {
   return raw() == Type::Handle(Type::Function()).type_class();
 }
 
 
@@ skipping 1536 matching lines @@
   Thread* thread = Thread::Current();
   Isolate* isolate = thread->isolate();
   Zone* zone = thread->zone();
   const Code& current_code = Code::Handle(zone, CurrentCode());
 
   if (FLAG_trace_deoptimization_verbose) {
     THR_Print("Disabling optimized code: '%s' entry: %#" Px "\n",
       ToFullyQualifiedCString(),
       current_code.EntryPoint());
   }
-  // Patch entry of the optimized code.
-  CodePatcher::PatchEntry(
-      current_code, Code::Handle(StubCode::FixCallersTarget_entry()->code()));
+  current_code.DisableDartCode();
   const Error& error = Error::Handle(zone,
       Compiler::EnsureUnoptimizedCode(thread, *this));
   if (!error.IsNull()) {
     Exceptions::PropagateError(error);
   }
   const Code& unopt_code = Code::Handle(zone, unoptimized_code());
   AttachCode(unopt_code);
-  CodePatcher::RestoreEntry(unopt_code);
+  unopt_code.Enable();
   isolate->TrackDeoptimizedCode(current_code);
 }
 
 
 void Function::set_unoptimized_code(const Code& value) const {
   ASSERT(value.IsNull() || !value.is_optimized());
   StorePointer(&raw_ptr()->unoptimized_code_, value.raw());
 }
 
 
@@ skipping 5235 matching lines @@
     // this to happen, so make sure we die loudly if we find
     // ourselves here.
     UNIMPLEMENTED();
   }
 
   virtual void ReportSwitchingCode(const Code& code) {
     if (FLAG_trace_deoptimization || FLAG_trace_deoptimization_verbose) {
       THR_Print("Prefix '%s': disabling %s code for %s function '%s'\n",
           String::Handle(prefix_.name()).ToCString(),
           code.is_optimized() ? "optimized" : "unoptimized",
-          CodePatcher::IsEntryPatched(code) ? "patched" : "unpatched",
+          code.IsDisabled() ? "'patched'" : "'unpatched'",
           Function::Handle(code.function()).ToCString());
     }
   }
 
  private:
   const LibraryPrefix& prefix_;
   DISALLOW_COPY_AND_ASSIGN(PrefixDependentArray);
 };
 
 
@@ skipping 2685 matching lines @@
   return obj.IsNull();
 }
 
 
 bool Code::IsFunctionCode() const {
   const Object& obj = Object::Handle(owner());
   return obj.IsFunction();
 }
 
 
+void Code::DisableDartCode() const {
+  ASSERT(IsFunctionCode());
+  ASSERT(instructions() == active_instructions());
+  const Code& new_code =
+      Code::Handle(StubCode::FixCallersTarget_entry()->code());
+  set_active_instructions(new_code.instructions());
+}
+
+
+void Code::DisableStubCode() const {
+ASSERT(IsAllocationStubCode());
+  ASSERT(instructions() == active_instructions());
+  const Code& new_code =
+      Code::Handle(StubCode::FixAllocationStubTarget_entry()->code());
+  set_active_instructions(new_code.instructions());
+}
+
+
 void Code::PrintJSONImpl(JSONStream* stream, bool ref) const {
   JSONObject jsobj(stream);
   AddCommonObjectProperties(&jsobj, "Code", ref);
   jsobj.AddFixedServiceId("code/%" Px64"-%" Px "",
                           compile_timestamp(),
                           EntryPoint());
   const String& user_name = String::Handle(PrettyName());
   const String& vm_name = String::Handle(Name());
   AddNameProperties(&jsobj, user_name, vm_name);
   const bool is_stub = IsStubCode() || IsAllocationStubCode();
@@ skipping 8157 matching lines @@
   return tag_label.ToCString();
 }
 
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 
 }  // namespace dart