Use root array to load roots in generated ARM code....

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 156 matching lines @@
                       LSL,
                       assembler::arm::Instr::kInstrSizeLog2 - kSmiTagSize));
   BlockConstPoolBefore(pc_offset() + (targets.length() + 1) * sizeof(Instr));
   nop();  // Jump table alignment.
   for (int i = 0; i < targets.length(); i++) {
     b(targets[i]);
   }
 }
 
 
+void MacroAssembler::LoadRoot(Register destination,
+                              Heap::RootListIndex index,
+                              Condition cond) {
+  ldr(destination, MemOperand(r10, index << kPointerSizeLog2), cond);
+}
+
+
 // Will clobber 4 registers: object, offset, scratch, ip.  The
 // register 'object' contains a heap object pointer.  The heap object
 // tag is shifted away.
 void MacroAssembler::RecordWrite(Register object, Register offset,
                                  Register scratch) {
   // This is how much we shift the remembered set bit offset to get the
   // offset of the word in the remembered set.  We divide by kBitsPerInt (32,
   // shift right 5) and then multiply by kIntSize (4, shift left 2).
   const int kRSetWordShift = 3;
 
@@ skipping 520 matching lines @@
   ldr(scratch, FieldMemOperand(scratch, GlobalObject::kGlobalContextOffset));
 
   // Check the context is a global context.
   if (FLAG_debug_code) {
     // TODO(119): avoid push(holder_reg)/pop(holder_reg)
     // Cannot use ip as a temporary in this verification code. Due to the fact
     // that ip is clobbered as part of cmp with an object Operand.
     push(holder_reg);  // Temporarily save holder on the stack.
     // Read the first word and compare to the global_context_map.
     ldr(holder_reg, FieldMemOperand(scratch, HeapObject::kMapOffset));
-    cmp(holder_reg, Operand(Factory::global_context_map()));
+    LoadRoot(ip, Heap::kGlobalContextMapRootIndex);
+    cmp(holder_reg, ip);
     Check(eq, "JSGlobalObject::global_context should be a global context.");
     pop(holder_reg);  // Restore holder.
   }
 
   // Check if both contexts are the same.
   ldr(ip, FieldMemOperand(holder_reg, JSGlobalProxy::kContextOffset));
   cmp(scratch, Operand(ip));
   b(eq, &same_contexts);
 
   // Check the context is a global context.
   if (FLAG_debug_code) {
     // TODO(119): avoid push(holder_reg)/pop(holder_reg)
     // Cannot use ip as a temporary in this verification code. Due to the fact
     // that ip is clobbered as part of cmp with an object Operand.
     push(holder_reg);  // Temporarily save holder on the stack.
     mov(holder_reg, ip);  // Move ip to its holding place.
-    cmp(holder_reg, Operand(Factory::null_value()));
+    LoadRoot(ip, Heap::kNullValueRootIndex);
+    cmp(holder_reg, ip);
     Check(ne, "JSGlobalProxy::context() should not be null.");
 
     ldr(holder_reg, FieldMemOperand(holder_reg, HeapObject::kMapOffset));
-    cmp(holder_reg, Operand(Factory::global_context_map()));
+    LoadRoot(ip, Heap::kGlobalContextMapRootIndex);
+    cmp(holder_reg, ip);
     Check(eq, "JSGlobalObject::global_context should be a global context.");
     // Restore ip is not needed. ip is reloaded below.
     pop(holder_reg);  // Restore holder.
     // Restore ip to holder's context.
     ldr(ip, FieldMemOperand(holder_reg, JSGlobalProxy::kContextOffset));
   }
 
   // Check that the security token in the calling global object is
   // compatible with the security token in the receiving global
   // object.
@@ skipping 36 matching lines @@
   tst(scratch, Operand(1 << Map::kHasNonInstancePrototype));
   b(ne, &non_instance);
 
   // Get the prototype or initial map from the function.
   ldr(result,
       FieldMemOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
 
   // If the prototype or initial map is the hole, don't return it and
   // simply miss the cache instead. This will allow us to allocate a
   // prototype object on-demand in the runtime system.
-  cmp(result, Operand(Factory::the_hole_value()));
+  LoadRoot(ip, Heap::kTheHoleValueRootIndex);
+  cmp(result, ip);
   b(eq, miss);
 
   // If the function does not have an initial map, we're done.
   Label done;
   CompareObjectType(result, scratch, scratch, MAP_TYPE);
   b(ne, &done);
 
   // Get the prototype from the initial map.
   ldr(result, FieldMemOperand(result, Map::kPrototypeOffset));
   jmp(&done);
@@ skipping 19 matching lines @@
   if (argc > 1)
     add(sp, sp, Operand((argc - 1) * kPointerSize));
   Ret();
 }
 
 
 void MacroAssembler::IllegalOperation(int num_arguments) {
   if (num_arguments > 0) {
     add(sp, sp, Operand(num_arguments * kPointerSize));
   }
-  mov(r0, Operand(Factory::undefined_value()));
+  LoadRoot(r0, Heap::kUndefinedValueRootIndex);
 }
 
 
 void MacroAssembler::CallRuntime(Runtime::Function* f, int num_arguments) {
   // All parameters are on the stack.  r0 has the return value after call.
 
   // If the expected number of arguments of the runtime function is
   // constant, we check that the actual number of arguments match the
   // expectation.
   if (f->nargs >= 0 && f->nargs != num_arguments) {
@@ skipping 159 matching lines @@
 #endif
   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