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6916623: Align object to 16 bytes to use Compressed Oops with java heap up to 64Gb

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Added new product ObjectAlignmentInBytes flag to control object alignment.

Reviewed-by: twisti, ysr, iveresov
This commit is contained in:
Vladimir Kozlov 2010-05-27 18:01:56 -07:00
parent 05b4f2e796
commit cc18a50e59
29 changed files with 222 additions and 136 deletions
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16
hotspot/src/share/vm/utilities/copy.hpp
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@ -51,7 +51,7 @@ extern "C" {
class Copy : AllStatic {
public:
// Block copy methods have four attributes. We don't define all possibilities.
// alignment: aligned according to minimum Java object alignment (MinObjAlignment)
// alignment: aligned to BytesPerLong
// arrayof: arraycopy operation with both operands aligned on the same
// boundary as the first element of an array of the copy unit.
// This is currently a HeapWord boundary on all platforms, except
@ -70,7 +70,7 @@ class Copy : AllStatic {
// [ '_atomic' ]
//
// Except in the arrayof case, whatever the alignment is, we assume we can copy
// whole alignment units. E.g., if MinObjAlignment is 2x word alignment, an odd
// whole alignment units. E.g., if BytesPerLong is 2x word alignment, an odd
// count may copy an extra word. In the arrayof case, we are allowed to copy
// only the number of copy units specified.
@ -305,17 +305,17 @@ class Copy : AllStatic {
}
static void assert_params_aligned(HeapWord* from, HeapWord* to) {
#ifdef ASSERT
if (mask_bits((uintptr_t)from, MinObjAlignmentInBytes-1) != 0)
basic_fatal("not object aligned");
if (mask_bits((uintptr_t)to, MinObjAlignmentInBytes-1) != 0)
basic_fatal("not object aligned");
if (mask_bits((uintptr_t)from, BytesPerLong-1) != 0)
basic_fatal("not long aligned");
if (mask_bits((uintptr_t)to, BytesPerLong-1) != 0)
basic_fatal("not long aligned");
#endif
}
static void assert_params_aligned(HeapWord* to) {
#ifdef ASSERT
if (mask_bits((uintptr_t)to, MinObjAlignmentInBytes-1) != 0)
basic_fatal("not object aligned");
if (mask_bits((uintptr_t)to, BytesPerLong-1) != 0)
basic_fatal("not long aligned");
#endif
}