Allow the embedder to pass the virtual memory limit to v8

src/spaces.cc

 // Copyright 2011 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 117 matching lines @@
     : isolate_(isolate),
       code_range_(NULL),
       free_list_(0),
       allocation_list_(0),
       current_allocation_block_index_(0) {
 }
 
 
 bool CodeRange::SetUp(const size_t requested) {
   ASSERT(code_range_ == NULL);
+  size_t actual_requested = requested;

[Michael Starzinger, 2014/04/09 12:03:04]

nit: Instead of having two variables "actual_requested" and "requested", can we
just mutate the latter in the condition below and drop the former?

[jochen (gone - plz use gerrit), 2014/04/09 12:44:56]

Done.

 
-  code_range_ = new VirtualMemory(requested);
+  if (actual_requested == 0) {
+    if (kIs64BitArch) {
+      actual_requested = 512 * MB;
+    } else {
+      return true;
+    }
+  }
+
+  code_range_ = new VirtualMemory(actual_requested);
   CHECK(code_range_ != NULL);
   if (!code_range_->IsReserved()) {
     delete code_range_;
     code_range_ = NULL;
     return false;
   }
 
   // We are sure that we have mapped a block of requested addresses.
-  ASSERT(code_range_->size() == requested);
-  LOG(isolate_, NewEvent("CodeRange", code_range_->address(), requested));
+  ASSERT(code_range_->size() == actual_requested);
+  LOG(isolate_,
+      NewEvent("CodeRange", code_range_->address(), actual_requested));
   Address base = reinterpret_cast<Address>(code_range_->address());
   Address aligned_base =
       RoundUp(reinterpret_cast<Address>(code_range_->address()),
               MemoryChunk::kAlignment);
   size_t size = code_range_->size() - (aligned_base - base);
   allocation_list_.Add(FreeBlock(aligned_base, size));
   current_allocation_block_index_ = 0;
   return true;
 }
 
@@ skipping 3042 matching lines @@
     object->ShortPrint();
     PrintF("\n");
   }
   printf(" --------------------------------------\n");
   printf(" Marked: %x, LiveCount: %x\n", mark_size, LiveBytes());
 }
 
 #endif  // DEBUG
 
 } }  // namespace v8::internal