Land patch by Pavel Podivilov (podivilov@chromium.org).

src/arm/ic-arm.cc

 // 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 688 matching lines @@
 }
 
 
 void KeyedLoadIC::GenerateString(MacroAssembler* masm) {
   // ---------- S t a t e --------------
   //  -- lr     : return address
   //  -- sp[0]  : key
   //  -- sp[4]  : receiver
   // -----------------------------------
 
+  Label miss, index_ok;
+
+  // Get the key and receiver object from the stack.
+  __ ldm(ia, sp, r0.bit() | r1.bit());
+
+  // Check that the receiver isn't a smi.
+  __ BranchOnSmi(r1, &miss);
+
+  // Check that the receiver is a string.
+  Condition is_string = masm->IsObjectStringType(r1, r2);
+  __ b(NegateCondition(is_string), &miss);
+
+  // Check if key is a smi or a heap number.
+  __ BranchOnSmi(r0, &index_ok);
+  __ CheckMap(r0, r2, Factory::heap_number_map(), &miss, false);
+
+  __ bind(&index_ok);
+  // Duplicate receiver and key since they are expected on the stack after
+  // the KeyedLoadIC call.
+  __ stm(db_w, sp, r0.bit() | r1.bit());
+  __ InvokeBuiltin(Builtins::STRING_CHAR_AT, JUMP_JS);
+
+  __ bind(&miss);
   GenerateGeneric(masm);
 }
 
 
 // Convert unsigned integer with specified number of leading zeroes in binary
 // representation to IEEE 754 double.
 // Integer to convert is passed in register hiword.
 // Resulting double is returned in registers hiword:loword.
 // This functions does not work correctly for 0.
 static void GenerateUInt2Double(MacroAssembler* masm,
@@ skipping 943 matching lines @@
   __ bind(&miss);
 
   GenerateMiss(masm);
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal