Add allocation support to x64 macro assembler

src/x64/macro-assembler-x64.h

 // Copyright 2006-2008 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 205 matching lines @@
   // Generate code for checking access rights - used for security checks
   // on access to global objects across environments. The holder register
   // is left untouched, but the scratch register and kScratchRegister,
   // which must be different, are clobbered.
   void CheckAccessGlobalProxy(Register holder_reg,
                               Register scratch,
                               Label* miss);
 
 
   // ---------------------------------------------------------------------------
+  // Allocation support
+
+  // Allocate an object in new space. If the new space is exhausted control
+  // continues at the gc_required label. The allocated object is returned in
+  // result and end of the new object is returned in result_end. The register
+  // scratch can be passed as no_reg in which case an additional object
+  // reference will be added to the reloc info. The returned pointers in result
+  // and result_end have not yet been tagged as heap objects. If
+  // result_contains_top_on_entry is true the content of result is known to be
+  // the allocation top on entry (could be result_end from a previous call to
+  // AllocateObjectInNewSpace). If result_contains_top_on_entry is true scratch
+  // should be no_reg as it is never used.
+  void AllocateObjectInNewSpace(int object_size,
+                                Register result,
+                                Register result_end,
+                                Register scratch,
+                                Label* gc_required,
+                                bool result_contains_top_on_entry);
+
+  void AllocateObjectInNewSpace(int header_size,
+                                ScaleFactor element_size,
+                                Register element_count,
+                                Register result,
+                                Register result_end,
+                                Register scratch,
+                                Label* gc_required,
+                                bool result_contains_top_on_entry);
+
+  void AllocateObjectInNewSpace(Register object_size,
+                                Register result,
+                                Register result_end,
+                                Register scratch,
+                                Label* gc_required,
+                                bool result_contains_top_on_entry);
+
+  // Undo allocation in new space. The object passed and objects allocated after
+  // it will no longer be allocated. Make sure that no pointers are left to the
+  // object(s) no longer allocated as they would be invalid when allocation is
+  // un-done.
+  void UndoAllocationInNewSpace(Register object);
+
+  // ---------------------------------------------------------------------------
   // Support functions.
 
   // Check if result is zero and op is negative.
   void NegativeZeroTest(Register result, Register op, Label* then_label);
 
   // Check if result is zero and op is negative in code using jump targets.
   void NegativeZeroTest(CodeGenerator* cgen,
                         Register result,
                         Register op,
                         JumpTarget* then_target);
@@ skipping 98 matching lines @@
                       Label* done,
                       InvokeFlag flag);
 
   // Get the code for the given builtin. Returns if able to resolve
   // the function in the 'resolved' flag.
   Handle<Code> ResolveBuiltin(Builtins::JavaScript id, bool* resolved);
 
   // Activation support.
   void EnterFrame(StackFrame::Type type);
   void LeaveFrame(StackFrame::Type type);
+
+  // Allocation support helpers.
+  void LoadAllocationTopHelper(Register result,
+                               Register result_end,
+                               Register scratch,
+                               bool result_contains_top_on_entry);
+  void UpdateAllocationTopHelper(Register result_end, Register scratch);
 };
 
 
 // The code patcher is used to patch (typically) small parts of code e.g. for
 // debugging and other types of instrumentation. When using the code patcher
 // the exact number of bytes specified must be emitted. Is not legal to emit
 // relocation information. If any of these constraints are violated it causes
 // an assertion.
 class CodePatcher {
  public:
@@ skipping 46 matching lines @@
   }                                                                       \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_MACRO_ASSEMBLER_X64_H_