Allow invalidation and recompilation of instance allocation stubs. Requested in order to implement…

runtime/vm/stub_code.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/stub_code.h"
 
 #include "platform/assert.h"
 #include "platform/globals.h"
 #include "vm/assembler.h"
 #include "vm/disassembler.h"
@@ skipping 100 matching lines @@
 
 
 RawCode* StubCode::GetAllocationStubForClass(const Class& cls) {
   Isolate* isolate = Isolate::Current();
   const Error& error = Error::Handle(isolate, cls.EnsureIsFinalized(isolate));
   ASSERT(error.IsNull());
   Code& stub = Code::Handle(isolate, cls.allocation_stub());
   if (stub.IsNull()) {
     Assembler assembler;
     const char* name = cls.ToCString();
-    StubCode::GenerateAllocationStubForClass(&assembler, cls);
+    uword patch_code_offset =
+        StubCode::GenerateAllocationStubForClass(&assembler, cls);
     stub ^= Code::FinalizeCode(name, &assembler);
     stub.set_owner(cls);
     cls.set_allocation_stub(stub);
     if (FLAG_disassemble_stubs) {
       OS::Print("Code for allocation stub '%s': {\n", name);
       DisassembleToStdout formatter;
       stub.Disassemble(&formatter);
       OS::Print("}\n");
     }
+    stub.set_entry_patch_pc_offset(0);
+    stub.set_patch_code_pc_offset(patch_code_offset);
   }
   return stub.raw();
 }
 
 
 uword StubCode::UnoptimizedStaticCallEntryPoint(intptr_t num_args_tested) {
   switch (num_args_tested) {
     case 0:
       return ZeroArgsUnoptimizedStaticCallEntryPoint();
     case 1:
@@ skipping 37 matching lines @@
   Isolate* isolate = Isolate::Current();
   if ((isolate != NULL) && (isolate->stub_code() != NULL)) {
     STUB_CODE_LIST(STUB_CODE_TESTER);
   }
 #undef VM_STUB_CODE_TESTER
 #undef STUB_CODE_TESTER
   return NULL;
 }
 
 }  // namespace dart