A64: Restore the stack limit protection to 1KB.

src/a64/simulator-a64.cc

 // Copyright 2013 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 341 matching lines @@
   ASSERT(sizeof(uintptr_t) < 2 * kXRegSize);
   set_sp(current_sp + 2 * kXRegSize);
   return address;
 }
 
 
 // Returns the limit of the stack area to enable checking for stack overflows.
 uintptr_t Simulator::StackLimit() const {
   // Leave a safety margin of 1024 bytes to prevent overrunning the stack when
   // pushing values.
-  // TODO(all): Increase the stack limit protection.
-
-  // The margin was decreased to 256 bytes, because we are intensively using
-  // the stack. The stack usage should decrease when our code improves. Then
-  // we can set it to 1024 again.
-  return reinterpret_cast<uintptr_t>(stack_limit_) + 256;
+  return reinterpret_cast<uintptr_t>(stack_limit_) + 1024;
 }
 
 
 Simulator::Simulator(Decoder<DispatchingDecoderVisitor>* decoder,
                      Isolate* isolate, FILE* stream)
     : decoder_(decoder),
       last_debugger_input_(NULL),
       log_parameters_(NO_PARAM),
       isolate_(isolate) {
   // Setup the decoder.
@@ skipping 3272 matching lines @@
     default:
       UNIMPLEMENTED();
   }
 }
 
 #endif  // USE_SIMULATOR
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_A64