diff options
Diffstat (limited to 'src/share/vm/oops/oop.inline.hpp')
-rw-r--r-- | src/share/vm/oops/oop.inline.hpp | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/src/share/vm/oops/oop.inline.hpp b/src/share/vm/oops/oop.inline.hpp index 3336fb20a..c840f46f9 100644 --- a/src/share/vm/oops/oop.inline.hpp +++ b/src/share/vm/oops/oop.inline.hpp @@ -146,8 +146,13 @@ inline bool oopDesc::is_null(narrowOop obj) { return obj == 0; } // offset from the heap base. Saving the check for null can save instructions // in inner GC loops so these are separated. +inline bool check_obj_alignment(oop obj) { + return (intptr_t)obj % MinObjAlignmentInBytes == 0; +} + inline narrowOop oopDesc::encode_heap_oop_not_null(oop v) { assert(!is_null(v), "oop value can never be zero"); + assert(check_obj_alignment(v), "Address not aligned"); assert(Universe::heap()->is_in_reserved(v), "Address not in heap"); address base = Universe::narrow_oop_base(); int shift = Universe::narrow_oop_shift(); @@ -167,7 +172,9 @@ inline oop oopDesc::decode_heap_oop_not_null(narrowOop v) { assert(!is_null(v), "narrow oop value can never be zero"); address base = Universe::narrow_oop_base(); int shift = Universe::narrow_oop_shift(); - return (oop)(void*)((uintptr_t)base + ((uintptr_t)v << shift)); + oop result = (oop)(void*)((uintptr_t)base + ((uintptr_t)v << shift)); + assert(check_obj_alignment(result), "Address not aligned"); + return result; } inline oop oopDesc::decode_heap_oop(narrowOop v) { @@ -522,10 +529,6 @@ inline bool oopDesc::has_bias_pattern() const { return mark()->has_bias_pattern(); } -inline bool check_obj_alignment(oop obj) { - return (intptr_t)obj % MinObjAlignmentInBytes == 0; -} - // used only for asserts inline bool oopDesc::is_oop(bool ignore_mark_word) const { @@ -600,6 +603,8 @@ inline bool oopDesc::is_forwarded() const { // Used by scavengers inline void oopDesc::forward_to(oop p) { + assert(check_obj_alignment(p), + "forwarding to something not aligned"); assert(Universe::heap()->is_in_reserved(p), "forwarding to something not in heap"); markOop m = markOopDesc::encode_pointer_as_mark(p); @@ -609,6 +614,8 @@ inline void oopDesc::forward_to(oop p) { // Used by parallel scavengers inline bool oopDesc::cas_forward_to(oop p, markOop compare) { + assert(check_obj_alignment(p), + "forwarding to something not aligned"); assert(Universe::heap()->is_in_reserved(p), "forwarding to something not in heap"); markOop m = markOopDesc::encode_pointer_as_mark(p); |