BumpPointerAllocator assumes page size is less than MINIMUM_BUMP_POOL_SIZE

https://bugs.webkit.org/show_bug.cgi?id=80912

Patch by Myles Maxfield <mmaxfield@google.com> on 2012-04-17
Reviewed by Hajime Morita.

* wtf/BumpPointerAllocator.h:
(WTF::BumpPointerPool::create):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@114477 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Source/JavaScriptCore/ChangeLog

+2012-04-17  Myles Maxfield  <mmaxfield@google.com>
+
+        BumpPointerAllocator assumes page size is less than MINIMUM_BUMP_POOL_SIZE
+        https://bugs.webkit.org/show_bug.cgi?id=80912
+
+        Reviewed by Hajime Morita.
+
+        * wtf/BumpPointerAllocator.h:
+        (WTF::BumpPointerPool::create):
+
 2012-04-17  Filip Pizlo  <fpizlo@apple.com>
         Attempt to fix Windows build.

Source/WTF/wtf/BumpPointerAllocator.h

@@ -26,7 +26,9 @@
 #ifndef BumpPointerAllocator_h
 #define BumpPointerAllocator_h
 
+#include <algorithm>
 #include <wtf/PageAllocation.h>
+#include <wtf/PageBlock.h>
 
 namespace WTF {
 
@@ -110,7 +112,7 @@ private:
         if (minimumCapacity < sizeof(BumpPointerPool))
             return 0;
 
-        size_t poolSize = MINIMUM_BUMP_POOL_SIZE;
+        size_t poolSize = std::max(static_cast<size_t>(MINIMUM_BUMP_POOL_SIZE), WTF::pageSize());
         while (poolSize < minimumCapacity) {
             poolSize <<= 1;
             // The following if check relies on MINIMUM_BUMP_POOL_SIZE being a power of 2!