Reimplement Maps and Sets in JS

src/mips/code-stubs-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_MIPS
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 1090 matching lines @@
     masm->mov(t9, s2);  // Function pointer to t9 to conform to ABI for PIC.
     masm->jalr(t9);
     // Set up sp in the delay slot.
     masm->addiu(sp, sp, -kCArgsSlotsSize);
     // Make sure the stored 'ra' points to this position.
     DCHECK_EQ(kNumInstructionsToJump,
               masm->InstructionsGeneratedSince(&find_ra));
   }
 
 
-  // Runtime functions should not return 'the hole'.  Allowing it to escape may
-  // lead to crashes in the IC code later.
-  if (FLAG_debug_code) {
-    Label okay;
-    __ LoadRoot(t0, Heap::kTheHoleValueRootIndex);
-    __ Branch(&okay, ne, v0, Operand(t0));
-    __ stop("The hole escaped");
-    __ bind(&okay);
-  }
-
   // Check result for exception sentinel.
   Label exception_returned;
   __ LoadRoot(t0, Heap::kExceptionRootIndex);
   __ Branch(&exception_returned, eq, t0, Operand(v0));
 
   // Check that there is no pending exception, otherwise we
   // should have returned the exception sentinel.
   if (FLAG_debug_code) {
     Label okay;
     ExternalReference pending_exception_address(
@@ skipping 4381 matching lines @@
                            kStackUnwindSpace, kInvalidStackOffset,
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS