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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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23
hotspot/src/share/vm/utilities/globalDefinitions.hpp
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@ -73,6 +73,9 @@ extern int LogBitsPerHeapOop;
extern int BytesPerHeapOop;
extern int BitsPerHeapOop;
// Oop encoding heap max
extern uint64_t OopEncodingHeapMax;
const int BitsPerJavaInteger = 32;
const int BitsPerJavaLong = 64;
const int BitsPerSize_t = size_tSize * BitsPerByte;
@ -292,12 +295,12 @@ const int max_method_code_size = 64*K - 1; // JVM spec, 2nd ed. section 4.8.1 (
// Minimum is max(BytesPerLong, BytesPerDouble, BytesPerOop) / HeapWordSize, so jlong, jdouble and
// reference fields can be naturally aligned.
const int MinObjAlignment = HeapWordsPerLong;
const int MinObjAlignmentInBytes = MinObjAlignment * HeapWordSize;
const int MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
extern int MinObjAlignment;
extern int MinObjAlignmentInBytes;
extern int MinObjAlignmentInBytesMask;
const int LogMinObjAlignment = LogHeapWordsPerLong;
const int LogMinObjAlignmentInBytes = LogMinObjAlignment + LogHeapWordSize;
extern int LogMinObjAlignment;
extern int LogMinObjAlignmentInBytes;
// Machine dependent stuff
@ -332,18 +335,16 @@ inline intptr_t align_object_size(intptr_t size) {
return align_size_up(size, MinObjAlignment);
}
// Pad out certain offsets to jlong alignment, in HeapWord units.
inline bool is_object_aligned(intptr_t addr) {
return addr == align_object_size(addr);
}
#define align_object_offset_(offset) align_size_up_(offset, HeapWordsPerLong)
// Pad out certain offsets to jlong alignment, in HeapWord units.
inline intptr_t align_object_offset(intptr_t offset) {
return align_size_up(offset, HeapWordsPerLong);
}
inline bool is_object_aligned(intptr_t offset) {
return offset == align_object_offset(offset);
}
//----------------------------------------------------------------------------------------------------
// Utility macros for compilers