MIPS: Ensure double aligned allocations through runtime routines.

src/runtime.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 9760 matching lines @@
 }
 
 
 // Allocate a block of memory in the given space (filled with a filler).
 // Used as a fall-back for generated code when the space is full.
 static MaybeObject* Allocate(Isolate* isolate,
                              int size,
                              bool double_align,
                              AllocationSpace space) {
   Heap* heap = isolate->heap();
+  if (double_align) size += kPointerSize;
   RUNTIME_ASSERT(IsAligned(size, kPointerSize));
   RUNTIME_ASSERT(size > 0);
   RUNTIME_ASSERT(size <= heap->MaxRegularSpaceAllocationSize());
   HeapObject* allocation;
   { MaybeObject* maybe_allocation = heap->AllocateRaw(size, space, space);
     if (!maybe_allocation->To(&allocation)) return maybe_allocation;
   }
 #ifdef DEBUG
   MemoryChunk* chunk = MemoryChunk::FromAddress(allocation->address());
   ASSERT(chunk->owner()->identity() == space);
 #endif
+  if (double_align) {
+    allocation = heap->EnsureDoubleAligned(allocation, size);
+  }
   heap->CreateFillerObjectAt(allocation->address(), size);
   return allocation;
 }
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_AllocateInNewSpace) {
   SealHandleScope shs(isolate);
   ASSERT(args.length() == 1);
   CONVERT_SMI_ARG_CHECKED(size, 0);
   return Allocate(isolate, size, false, NEW_SPACE);
@@ skipping 5084 matching lines @@
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(Heap::kNoGCFlags,
                                        "Runtime::PerformGC");
   }
 }
 
 
 } }  // namespace v8::internal