First step in allocating objects in generated code on ARM

src/arm/macro-assembler-arm.cc

 // Copyright 2006-2009 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 772 matching lines @@
       ExternalReference::new_space_allocation_top_address();
   mov(scratch1, Operand(new_space_allocation_top));
   ldr(result, MemOperand(scratch1));
 
   // Calculate new top and bail out if new space is exhausted. Use result
   // to calculate the new top.
   ExternalReference new_space_allocation_limit =
       ExternalReference::new_space_allocation_limit_address();
   mov(scratch2, Operand(new_space_allocation_limit));
   ldr(scratch2, MemOperand(scratch2));
-  add(result, result, Operand(object_size));
+  add(result, result, Operand(object_size * kPointerSize));
   cmp(result, Operand(scratch2));
   b(hi, gc_required);
 
   // Update allocation top. result temporarily holds the new top,
   str(result, MemOperand(scratch1));
 
   // Tag and adjust back to start of new object.
   if (tag_allocated_object) {
-    sub(result, result, Operand(object_size - kHeapObjectTag));
+    sub(result, result, Operand((object_size * kPointerSize) -
+                                kHeapObjectTag));
   } else {
-    sub(result, result, Operand(object_size));
+    sub(result, result, Operand(object_size * kPointerSize));
   }
 }
 
 
+void MacroAssembler::AllocateObjectInNewSpace(Register object_size,
+                                              Register result,
+                                              Register scratch1,
+                                              Register scratch2,
+                                              Label* gc_required,
+                                              bool tag_allocated_object) {
+  ASSERT(!result.is(scratch1));
+  ASSERT(!scratch1.is(scratch2));
+
+  // Load address of new object into result and allocation top address into
+  // scratch1.
+  ExternalReference new_space_allocation_top =
+      ExternalReference::new_space_allocation_top_address();
+  mov(scratch1, Operand(new_space_allocation_top));
+  ldr(result, MemOperand(scratch1));
+
+  // Calculate new top and bail out if new space is exhausted. Use result
+  // to calculate the new top. Object size is in words so a shift is required to
+  // get the number of bytes
+  ExternalReference new_space_allocation_limit =
+      ExternalReference::new_space_allocation_limit_address();
+  mov(scratch2, Operand(new_space_allocation_limit));
+  ldr(scratch2, MemOperand(scratch2));
+  add(result, result, Operand(object_size, LSL, kPointerSizeLog2));
+
+  cmp(result, Operand(scratch2));
+  b(hi, gc_required);
+
+  // Update allocation top. result temporarily holds the new top,
+  str(result, MemOperand(scratch1));
+
+  // Tag and adjust back to start of new object.
+  if (tag_allocated_object) {
+    sub(result, result, Operand(object_size, LSL, kPointerSizeLog2));
+    add(result, result, Operand(kHeapObjectTag));
+  } else {
+    sub(result, result, Operand(object_size, LSL, kPointerSizeLog2));
+  }
+}
+
+
+void MacroAssembler::UndoAllocationInNewSpace(Register object,
+                                              Register scratch) {
+  ExternalReference new_space_allocation_top =
+      ExternalReference::new_space_allocation_top_address();
+
+  // Make sure the object has no tag before resetting top.
+  and_(object, object, Operand(~kHeapObjectTagMask));
+#ifdef DEBUG
+  // Check that the object un-allocated is below the current top.
+  mov(scratch, Operand(new_space_allocation_top));
+  ldr(scratch, MemOperand(scratch));
+  cmp(object, scratch);
+  Check(lt, "Undo allocation of non allocated memory");
+#endif
+  // Write the address of the object to un-allocate as the current top.
+  mov(scratch, Operand(new_space_allocation_top));
+  str(object, MemOperand(scratch));
+}
+
+
 void MacroAssembler::CompareObjectType(Register function,
                                        Register map,
                                        Register type_reg,
                                        InstanceType type) {
   ldr(map, FieldMemOperand(function, HeapObject::kMapOffset));
+  CompareInstanceType(map, type_reg, type);
+}
+
+
+void MacroAssembler::CompareInstanceType(Register map,
+                                         Register type_reg,
+                                         InstanceType type) {
   ldrb(type_reg, FieldMemOperand(map, Map::kInstanceTypeOffset));
   cmp(type_reg, Operand(type));
 }
 
 
 void MacroAssembler::TryGetFunctionPrototype(Register function,
                                              Register result,
                                              Register scratch,
                                              Label* miss) {
   // Check that the receiver isn't a smi.
@@ skipping 231 matching lines @@
   mov(r0, Operand(p0));
   push(r0);
   mov(r0, Operand(Smi::FromInt(p1 - p0)));
   push(r0);
   CallRuntime(Runtime::kAbort, 2);
   // will not return here
 }
 
 
 } }  // namespace v8::internal