[heap] Assert that code objects are always properly aligned.

src/heap/heap.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"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/bits.h"
 #include "src/base/once.h"
@@ skipping 3713 matching lines @@
       // be moved.
       CreateFillerObjectAt(result->address(), object_size);
       allocation = lo_space_->AllocateRaw(object_size, EXECUTABLE);
       if (!allocation.To(&result)) return allocation;
       OnAllocationEvent(result, object_size);
     }
   }
 
   result->set_map_no_write_barrier(code_map());
   Code* code = Code::cast(result);
+  DCHECK(IsAligned(bit_cast<intptr_t>(code->address()), kCodeAlignment));
   DCHECK(isolate_->code_range() == NULL || !isolate_->code_range()->valid() ||
          isolate_->code_range()->contains(code->address()));
   code->set_gc_metadata(Smi::FromInt(0));
   code->set_ic_age(global_ic_age_);
   return code;
 }
 
 
 AllocationResult Heap::CopyCode(Code* code) {
   AllocationResult allocation;
@@ skipping 17 matching lines @@
   // Copy code object.
   Address old_addr = code->address();
   Address new_addr = result->address();
   CopyBlock(new_addr, old_addr, obj_size);
   Code* new_code = Code::cast(result);
 
   // Update the constant pool.
   new_code->set_constant_pool(new_constant_pool);
 
   // Relocate the copy.
+  DCHECK(IsAligned(bit_cast<intptr_t>(new_code->address()), kCodeAlignment));
   DCHECK(isolate_->code_range() == NULL || !isolate_->code_range()->valid() ||
          isolate_->code_range()->contains(code->address()));
   new_code->Relocate(new_addr - old_addr);
   return new_code;
 }
 
 
 AllocationResult Heap::CopyCode(Code* code, Vector<byte> reloc_info) {
   // Allocate ByteArray and ConstantPoolArray before the Code object, so that we
   // do not risk leaving uninitialized Code object (and breaking the heap).
@@ skipping 38 matching lines @@
   new_code->set_relocation_info(reloc_info_array);
 
   // Update constant pool.
   new_code->set_constant_pool(new_constant_pool);
 
   // Copy patched rinfo.
   CopyBytes(new_code->relocation_start(), reloc_info.start(),
             static_cast<size_t>(reloc_info.length()));
 
   // Relocate the copy.
+  DCHECK(IsAligned(bit_cast<intptr_t>(new_code->address()), kCodeAlignment));
   DCHECK(isolate_->code_range() == NULL || !isolate_->code_range()->valid() ||
          isolate_->code_range()->contains(code->address()));
   new_code->Relocate(new_addr - old_addr);
 
 #ifdef VERIFY_HEAP
   if (FLAG_verify_heap) code->ObjectVerify();
 #endif
   return new_code;
 }
 
@@ skipping 2596 matching lines @@
       static_cast<int>(object_sizes_last_time_[index]));
   CODE_AGE_LIST_COMPLETE(ADJUST_LAST_TIME_OBJECT_COUNT)
 #undef ADJUST_LAST_TIME_OBJECT_COUNT
 
   MemCopy(object_counts_last_time_, object_counts_, sizeof(object_counts_));
   MemCopy(object_sizes_last_time_, object_sizes_, sizeof(object_sizes_));
   ClearObjectStats();
 }
 }
 }  // namespace v8::internal