Store transitioned JSArray maps in global context

src/arm/macro-assembler-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 2861 matching lines @@
     }
   } else {
     // Slot is in the current function context.  Move it into the
     // destination register in case we store into it (the write barrier
     // cannot be allowed to destroy the context in esi).
     mov(dst, cp);
   }
 }
 
 
+void MacroAssembler::LoadGlobalInitialConstructedArrayMap(
+    Register function_in, Register scratch, Register map_out) {
+  ASSERT(!function_in.is(map_out));
+  Label done;
+  ldr(map_out, FieldMemOperand(function_in,
+                               JSFunction::kPrototypeOrInitialMapOffset));
+  if (!FLAG_smi_only_arrays) {
+    // Load the global or builtins object from the current context.
+    ldr(scratch, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
+    ldr(scratch, FieldMemOperand(scratch, GlobalObject::kGlobalContextOffset));
+
+    // Check that the function's map is same as the cached map.
+    ldr(ip, MemOperand(
+        scratch, Context::SlotOffset(Context::SMI_JS_ARRAY_MAP_INDEX)));
+    cmp(map_out, ip);
+    b(ne, &done);
+
+    // Use the cached transitioned map.
+    ldr(map_out,
+        MemOperand(scratch,
+                   Context::SlotOffset(Context::OBJECT_JS_ARRAY_MAP_INDEX)));
+  }
+  bind(&done);
+}
+
+
 void MacroAssembler::LoadGlobalFunction(int index, Register function) {
   // Load the global or builtins object from the current context.
   ldr(function, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
   // Load the global context from the global or builtins object.
   ldr(function, FieldMemOperand(function,
                                 GlobalObject::kGlobalContextOffset));
   // Load the function from the global context.
   ldr(function, MemOperand(function, Context::SlotOffset(index)));
 }
 
@@ skipping 786 matching lines @@
 void CodePatcher::EmitCondition(Condition cond) {
   Instr instr = Assembler::instr_at(masm_.pc_);
   instr = (instr & ~kCondMask) | cond;
   masm_.emit(instr);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM