Allow the embedder to pass the virtual memory limit to v8

src/spaces.cc

Index: src/spaces.cc
diff --git a/src/spaces.cc b/src/spaces.cc
index 20efbf72e080f36d8fe9e50833cce25043f7c928..b4dbf1cb4b86d0dad24c48c4e814545e1b69079e 100644
--- a/src/spaces.cc
+++ b/src/spaces.cc
@@ -135,8 +135,17 @@ CodeRange::CodeRange(Isolate* isolate)
 
 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_;
@@ -145,8 +154,9 @@ bool CodeRange::SetUp(const size_t requested) {
   }
 
   // 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()),