1.1 --- a/src/share/vm/utilities/globalDefinitions.hpp Wed Apr 03 16:43:09 2013 -0700
1.2 +++ b/src/share/vm/utilities/globalDefinitions.hpp Thu Apr 04 10:01:26 2013 -0700
1.3 @@ -419,6 +419,24 @@
1.4 return align_size_up(offset, HeapWordsPerLong);
1.5 }
1.6
1.7 +// Clamp an address to be within a specific page
1.8 +// 1. If addr is on the page it is returned as is
1.9 +// 2. If addr is above the page_address the start of the *next* page will be returned
1.10 +// 3. Otherwise, if addr is below the page_address the start of the page will be returned
1.11 +inline address clamp_address_in_page(address addr, address page_address, intptr_t page_size) {
1.12 + if (align_size_down(intptr_t(addr), page_size) == align_size_down(intptr_t(page_address), page_size)) {
1.13 + // address is in the specified page, just return it as is
1.14 + return addr;
1.15 + } else if (addr > page_address) {
1.16 + // address is above specified page, return start of next page
1.17 + return (address)align_size_down(intptr_t(page_address), page_size) + page_size;
1.18 + } else {
1.19 + // address is below specified page, return start of page
1.20 + return (address)align_size_down(intptr_t(page_address), page_size);
1.21 + }
1.22 +}
1.23 +
1.24 +
1.25 // The expected size in bytes of a cache line, used to pad data structures.
1.26 #define DEFAULT_CACHE_LINE_SIZE 64
1.27
1.28 @@ -1296,4 +1314,15 @@
1.29 return *(void**)addr;
1.30 }
1.31
1.32 +
1.33 +#ifndef PRODUCT
1.34 +
1.35 +// For unit testing only
1.36 +class GlobalDefinitions {
1.37 +public:
1.38 + static void test_globals();
1.39 +};
1.40 +
1.41 +#endif // PRODUCT
1.42 +
1.43 #endif // SHARE_VM_UTILITIES_GLOBALDEFINITIONS_HPP
