Allow page allocations to include guard pages

The PageAllocator is in principle capable of using guard pages. We can
expose that functionality to its clients.

Change-Id: I919f6f76310feb160d2b26ac1fc64db4e91804bb
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/src/3rdparty/masm/wtf/PageBlock.h b/src/3rdparty/masm/wtf/PageBlock.h
index 56e5570178..4d408e1c91 100644
--- a/src/3rdparty/masm/wtf/PageBlock.h
+++ b/src/3rdparty/masm/wtf/PageBlock.h
@@ -40,8 +40,13 @@ public:
     PageBlock(const PageBlock&);
     PageBlock(void*, size_t, bool hasGuardPages);
     
+    void* realBase() const { return m_realBase; }
     void* base() const { return m_base; }
-    size_t size() const { return m_size; }
+    size_t size() const
+    {
+        return m_size - 2 * (static_cast<char *>(m_base) - static_cast<char *>(m_realBase));
+    }
+    size_t realSize() const { return m_size; }
 
     operator bool() const { return !!m_realBase; }