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comparison src/share/vm/oops/arrayOop.hpp @ 165:437d03ea40b1

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6703888: Compressed Oops: use the 32-bits gap after klass in a object Summary: Use the gap also for a narrow oop field and a boxing object value. Reviewed-by: coleenp, never
author kvn
date Wed, 21 May 2008 16:31:35 -0700
parents ba764ed4b6f2
children d1605aabd0a1
comparison
equal deleted inserted replaced
164:c436414a719e 165:437d03ea40b1
39 // Interpreter/Compiler offsets 39 // Interpreter/Compiler offsets
40 40
41 // Header size computation. 41 // Header size computation.
42 // The header is considered the oop part of this type plus the length. 42 // The header is considered the oop part of this type plus the length.
43 // Returns the aligned header_size_in_bytes. This is not equivalent to 43 // Returns the aligned header_size_in_bytes. This is not equivalent to
44 // sizeof(arrayOopDesc) which should not appear in the code, except here. 44 // sizeof(arrayOopDesc) which should not appear in the code.
45 static int header_size_in_bytes() { 45 static int header_size_in_bytes() {
46 size_t hs = UseCompressedOops ? 46 size_t hs = align_size_up(length_offset_in_bytes() + sizeof(int),
47 sizeof(arrayOopDesc) : 47 HeapWordSize);
48 align_size_up(sizeof(arrayOopDesc) + sizeof(int), HeapWordSize);
49 #ifdef ASSERT 48 #ifdef ASSERT
50 // make sure it isn't called before UseCompressedOops is initialized. 49 // make sure it isn't called before UseCompressedOops is initialized.
51 static size_t arrayoopdesc_hs = 0; 50 static size_t arrayoopdesc_hs = 0;
52 if (arrayoopdesc_hs == 0) arrayoopdesc_hs = hs; 51 if (arrayoopdesc_hs == 0) arrayoopdesc_hs = hs;
53 assert(arrayoopdesc_hs == hs, "header size can't change"); 52 assert(arrayoopdesc_hs == hs, "header size can't change");