Simplify the IA32 exception handler block by removing the unused code...

src/ia32/macro-assembler-ia32.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 430 matching lines @@
   push(ecx);
 
   // Clear the top frame.
   ExternalReference c_entry_fp_address(Top::k_c_entry_fp_address);
   mov(Operand::StaticVariable(c_entry_fp_address), Immediate(0));
 }
 
 
 void MacroAssembler::PushTryHandler(CodeLocation try_location,
                                     HandlerType type) {
-  ASSERT(StackHandlerConstants::kSize == 6 * kPointerSize);  // adjust this code
+  // Adjust this code if not the case.
+  ASSERT(StackHandlerConstants::kSize == 4 * kPointerSize);
   // The pc (return address) is already on TOS.
   if (try_location == IN_JAVASCRIPT) {
     if (type == TRY_CATCH_HANDLER) {
       push(Immediate(StackHandler::TRY_CATCH));
     } else {
       push(Immediate(StackHandler::TRY_FINALLY));
     }
-    push(Immediate(Smi::FromInt(StackHandler::kCodeNotPresent)));
     push(ebp);
-    push(edi);
   } else {
     ASSERT(try_location == IN_JS_ENTRY);
     // The parameter pointer is meaningless here and ebp does not
     // point to a JS frame. So we save NULL for both pp and ebp. We
     // expect the code throwing an exception to check ebp before
     // dereferencing it to restore the context.
     push(Immediate(StackHandler::ENTRY));
-    push(Immediate(Smi::FromInt(StackHandler::kCodeNotPresent)));
     push(Immediate(0));  // NULL frame pointer
-    push(Immediate(0));  // NULL parameter pointer
   }
   // Cached TOS.
   mov(eax, Operand::StaticVariable(ExternalReference(Top::k_handler_address)));
   // Link this handler.
   mov(Operand::StaticVariable(ExternalReference(Top::k_handler_address)), esp);
 }
 
 
 Register MacroAssembler::CheckMaps(JSObject* object, Register object_reg,
                                    JSObject* holder, Register holder_reg,
@@ skipping 561 matching lines @@
   // Indicate that code has changed.
   CPU::FlushICache(address_, size_);
 
   // Check that the code was patched as expected.
   ASSERT(masm_.pc_ == address_ + size_);
   ASSERT(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap);
 }
 
 
 } }  // namespace v8::internal