Allocation Info Tracking, continued.

src/arm/code-stubs-arm.cc

 // Copyright 2012 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 45 matching lines @@
   descriptor->register_param_count_ = 2;
   descriptor->register_params_ = registers;
   Address entry =
       Runtime::FunctionForId(Runtime::kTransitionElementsKind)->entry;
   descriptor->deoptimization_handler_ = FUNCTION_ADDR(entry);
 }
 
 
 static void InitializeArrayConstructorDescriptor(Isolate* isolate,
     CodeStubInterfaceDescriptor* descriptor) {
+  // register state
+  // r1 -- constructor function
+  // r2 -- type info cell with elements kind
+  // r0 -- number of arguments to the constructor function
   static Register registers[] = { r1, r2 };
   descriptor->register_param_count_ = 2;
   // stack param count needs (constructor pointer, and single argument)
   descriptor->stack_parameter_count_ = &r0;
   descriptor->register_params_ = registers;
   descriptor->extra_expression_stack_count_ = 1;
   descriptor->deoptimization_handler_ =
       FUNCTION_ADDR(ArrayConstructor_StubFailure);
 }
 
@@ skipping 5556 matching lines @@
   __ CompareRoot(r3, Heap::kUndefinedValueRootIndex);
   __ b(eq, &done);
 
   // Special handling of the Array() function, which caches not only the
   // monomorphic Array function but the initial ElementsKind with special
   // sentinels
   Handle<Object> terminal_kind_sentinel =
       TypeFeedbackCells::MonomorphicArraySentinel(LAST_FAST_ELEMENTS_KIND);
   __ cmp(r3, Operand(terminal_kind_sentinel));
   __ b(ne, &miss);
-  // Load the global or builtins object from the current context
-  __ ldr(r3, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
-  __ ldr(r3, FieldMemOperand(r3, GlobalObject::kGlobalContextOffset));
   // Make sure the function is the Array() function
-  __ ldr(r3,
-         MemOperand(r3, Context::SlotOffset(Context::ARRAY_FUNCTION_INDEX)));
+  __ LoadArrayFunction(r3);
   __ cmp(r1, r3);
-  Label megamorphic_pre;
-  __ b(ne, &megamorphic_pre);
+  __ b(ne, &megamorphic);
   __ jmp(&done);
 
-  __ bind(&megamorphic_pre);
-  __ jmp(&megamorphic);
-
   __ bind(&miss);
 
   // A monomorphic miss (i.e, here the cache is not uninitialized) goes
   // megamorphic.
   __ CompareRoot(r3, Heap::kTheHoleValueRootIndex);
   __ b(eq, &initialize);
   // MegamorphicSentinel is an immortal immovable object (undefined) so no
   // write-barrier is needed.
   __ bind(&megamorphic);
   __ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
   __ str(ip, FieldMemOperand(r2, JSGlobalPropertyCell::kValueOffset));
 
   // An uninitialized cache is patched with the function or sentinel to
   // indicate the ElementsKind if function is the Array constructor.
   __ bind(&initialize);
-  __ ldr(r3, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
-  __ ldr(r3, FieldMemOperand(r3, GlobalObject::kGlobalContextOffset));
-  __ ldr(r3,
-         MemOperand(r3, Context::SlotOffset(Context::ARRAY_FUNCTION_INDEX)));
   // Make sure the function is the Array() function
+  __ LoadArrayFunction(r3);
   __ cmp(r1, r3);
   __ b(ne, &not_array_function);
 
   // The target function is the Array constructor, install a sentinel value in
   // the constructor's type info cell that will track the initial ElementsKind
   // that should be used for the array when its constructed.
   Handle<Object> initial_kind_sentinel =
       TypeFeedbackCells::MonomorphicArraySentinel(
           GetInitialFastElementsKind());
   __ mov(r3, Operand(initial_kind_sentinel));
@@ skipping 2340 matching lines @@
 
   __ Pop(lr, r5, r1);
   __ Ret();
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM