Streamline throwing in the C entry stub.

src/x64/macro-assembler-x64.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 2534 matching lines @@
   Label skip;
   testq(rsi, rsi);
   j(zero, &skip, Label::kNear);
   movq(Operand(rbp, StandardFrameConstants::kContextOffset), rsi);
   bind(&skip);
 
   JumpToHandlerEntry();
 }
 
 
-void MacroAssembler::ThrowUncatchable(UncatchableExceptionType type,
-                                      Register value) {
+void MacroAssembler::ThrowUncatchable(Register value) {
   // Adjust this code if not the case.
   STATIC_ASSERT(StackHandlerConstants::kSize == 5 * kPointerSize);
   STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
   STATIC_ASSERT(StackHandlerConstants::kCodeOffset == 1 * kPointerSize);
   STATIC_ASSERT(StackHandlerConstants::kStateOffset == 2 * kPointerSize);
   STATIC_ASSERT(StackHandlerConstants::kContextOffset == 3 * kPointerSize);
   STATIC_ASSERT(StackHandlerConstants::kFPOffset == 4 * kPointerSize);
 
   // The exception is expected in rax.
-  if (type == OUT_OF_MEMORY) {
-    // Set external caught exception to false.
-    ExternalReference external_caught(Isolate::kExternalCaughtExceptionAddress,
-                                      isolate());
-    Set(rax, static_cast<int64_t>(false));
-    Store(external_caught, rax);
-
-    // Set pending exception and rax to out of memory exception.
-    ExternalReference pending_exception(Isolate::kPendingExceptionAddress,
-                                        isolate());
-    movq(rax, Failure::OutOfMemoryException(), RelocInfo::NONE);
-    Store(pending_exception, rax);
-  } else if (!value.is(rax)) {
+  if (!value.is(rax)) {
     movq(rax, value);
   }
-
   // Drop the stack pointer to the top of the top stack handler.
   ExternalReference handler_address(Isolate::kHandlerAddress, isolate());
   Load(rsp, handler_address);
 
   // Unwind the handlers until the top ENTRY handler is found.
   Label fetch_next, check_kind;
   jmp(&check_kind, Label::kNear);
   bind(&fetch_next);
   movq(rsp, Operand(rsp, StackHandlerConstants::kNextOffset));
 
@@ skipping 1782 matching lines @@
 
   and_(bitmap_scratch, Immediate(~Page::kPageAlignmentMask));
   addl(Operand(bitmap_scratch, MemoryChunk::kLiveBytesOffset), length);
 
   bind(&done);
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64