Add the possibility for a code stub to be non-movable...

src/heap.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1888 matching lines @@
     if (!maybe_elements->ToObject(&elements)) return false;
   }
   FixedArray::cast(elements)->set(0, Smi::FromInt(0));
   JSObject::cast(obj)->set_elements(FixedArray::cast(elements));
   set_message_listeners(JSObject::cast(obj));
 
   return true;
 }
 
 
-void Heap::CreateCEntryStub() {
-  CEntryStub stub(1);
-  set_c_entry_code(*stub.GetCode());
-}
-
-
-#if V8_TARGET_ARCH_ARM && !V8_INTERPRETED_REGEXP
-void Heap::CreateRegExpCEntryStub() {
-  RegExpCEntryStub stub;
-  set_re_c_entry_code(*stub.GetCode());
-}
-#endif
-
-
 void Heap::CreateJSEntryStub() {
   JSEntryStub stub;
   set_js_entry_code(*stub.GetCode());
 }
 
 
 void Heap::CreateJSConstructEntryStub() {
   JSConstructEntryStub stub;
   set_js_construct_entry_code(*stub.GetCode());
 }
 
 
-#if V8_TARGET_ARCH_ARM
-void Heap::CreateDirectCEntryStub() {
-  DirectCEntryStub stub;
-  set_direct_c_entry_code(*stub.GetCode());
-}
-#endif
-
-
 void Heap::CreateFixedStubs() {
   // Here we create roots for fixed stubs. They are needed at GC
   // for cooking and uncooking (check out frames.cc).
   // The eliminates the need for doing dictionary lookup in the
   // stub cache for these stubs.
   HandleScope scope;
   // gcc-4.4 has problem generating correct code of following snippet:
-  // {  CEntryStub stub;
-  //    c_entry_code_ = *stub.GetCode();
+  // {  JSEntryStub stub;
+  //    js_entry_code_ = *stub.GetCode();
   // }
-  // {  DebuggerStatementStub stub;
-  //    debugger_statement_code_ = *stub.GetCode();
+  // {  JSConstructEntryStub stub;
+  //    js_construct_entry_code_ = *stub.GetCode();
   // }
   // To workaround the problem, make separate functions without inlining.
-  Heap::CreateCEntryStub();
   Heap::CreateJSEntryStub();
   Heap::CreateJSConstructEntryStub();
-#if V8_TARGET_ARCH_ARM && !V8_INTERPRETED_REGEXP
-  Heap::CreateRegExpCEntryStub();
-#endif
-#if V8_TARGET_ARCH_ARM
-  Heap::CreateDirectCEntryStub();
-#endif
 }
 
 
 bool Heap::CreateInitialObjects() {
   Object* obj;
 
   // The -0 value must be set before NumberFromDouble works.
   { MaybeObject* maybe_obj = AllocateHeapNumber(-0.0, TENURED);
     if (!maybe_obj->ToObject(&obj)) return false;
   }
@@ skipping 750 matching lines @@
   reinterpret_cast<ExternalArray*>(result)->set_length(length);
   reinterpret_cast<ExternalArray*>(result)->set_external_pointer(
       external_pointer);
 
   return result;
 }
 
 
 MaybeObject* Heap::CreateCode(const CodeDesc& desc,
                               Code::Flags flags,
-                              Handle<Object> self_reference) {
+                              Handle<Object> self_reference,
+                              bool immovable) {
   // Allocate ByteArray before the Code object, so that we do not risk
   // leaving uninitialized Code object (and breaking the heap).
   Object* reloc_info;
   { MaybeObject* maybe_reloc_info = AllocateByteArray(desc.reloc_size, TENURED);
     if (!maybe_reloc_info->ToObject(&reloc_info)) return maybe_reloc_info;
   }
 
-  // Compute size
+  // Compute size.
   int body_size = RoundUp(desc.instr_size, kObjectAlignment);
   int obj_size = Code::SizeFor(body_size);
   ASSERT(IsAligned(static_cast<intptr_t>(obj_size), kCodeAlignment));
   MaybeObject* maybe_result;
-  if (obj_size > MaxObjectSizeInPagedSpace()) {
+  // Large code objects and code objects which should stay at a fixed address
+  // are allocated in large object space.
+  if (obj_size > MaxObjectSizeInPagedSpace() || immovable) {
     maybe_result = lo_space_->AllocateRawCode(obj_size);
   } else {
     maybe_result = code_space_->AllocateRaw(obj_size);
   }
 
   Object* result;
   if (!maybe_result->ToObject(&result)) return maybe_result;
 
   // Initialize the object
   HeapObject::cast(result)->set_map(code_map());
@@ skipping 2841 matching lines @@
 void ExternalStringTable::TearDown() {
   new_space_strings_.Free();
   old_space_strings_.Free();
 }
 
 
 List<Object*> ExternalStringTable::new_space_strings_;
 List<Object*> ExternalStringTable::old_space_strings_;
 
 } }  // namespace v8::internal