Basic implementation of incremental marking.

src/assembler.h

Index: src/assembler.h
diff --git a/src/assembler.h b/src/assembler.h
index c01c29bffeb399a090b481b25420860231742e82..3494b74862411a750568d6e8ef62931a465a199e 100644
--- a/src/assembler.h
+++ b/src/assembler.h
@@ -271,14 +271,14 @@ class RelocInfo BASE_EMBEDDED {
   // this relocation applies to;
   // can only be called if IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY
   INLINE(Address target_address());
-  INLINE(void set_target_address(Address target));
+  INLINE(void set_target_address(Address target, Code* code));

[Erik Corry, 2011/02/22 12:27:19]

Could you use GetCodeFromTargetAddress instead of adding an argument?

Actually it seems that they are not the same object.  Perhaps a better name than
'code' can be found.

[Vyacheslav Egorov (Chromium), 2011/02/23 14:31:46]

Done.

   INLINE(Object* target_object());
   INLINE(Handle<Object> target_object_handle(Assembler* origin));
   INLINE(Object** target_object_address());
-  INLINE(void set_target_object(Object* target));
+  INLINE(void set_target_object(Object* target, Code* code));
   INLINE(JSGlobalPropertyCell* target_cell());
   INLINE(Handle<JSGlobalPropertyCell> target_cell_handle());
-  INLINE(void set_target_cell(JSGlobalPropertyCell* cell));
+  INLINE(void set_target_cell(JSGlobalPropertyCell* cell, Code* code));
 
 
   // Read the address of the word containing the target_address in an
@@ -521,6 +521,7 @@ class ExternalReference BASE_EMBEDDED {
   // pattern. This means that they have to be added to the
   // ExternalReferenceTable in serialize.cc manually.
 
+  static ExternalReference incremental_marking_record_write_function();
   static ExternalReference perform_gc_function();
   static ExternalReference fill_heap_number_with_random_function();
   static ExternalReference random_uint32_function();