1883
1884 bool nmethod::oops_do_try_claim_weak_done_as_strong_done(nmethod::oops_do_mark_link* next) {
1885 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1886 assert(extract_state(next) == claim_weak_done_tag, "Should be claimed as weak done");
1887
1888 oops_do_mark_link* old_next = Atomic::cmpxchg(mark_link(extract_nmethod(next), claim_strong_done_tag), &_oops_do_mark_link, next);
1889 if (old_next == next) {
1890 oops_do_log_change("oops_do, mark weak done -> mark strong done");
1891 return true;
1892 }
1893 return false;
1894 }
1895
1896 nmethod* nmethod::oops_do_try_add_to_list_as_weak_done() {
1897 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1898
1899 assert(extract_state(_oops_do_mark_link) == claim_weak_request_tag ||
1900 extract_state(_oops_do_mark_link) == claim_strong_request_tag,
1901 "must be but is nmethod " PTR_FORMAT " %u", p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
1902
1903 nmethod* old_head = Atomic::xchg(this, &_oops_do_mark_nmethods);
1904 // Self-loop if needed.
1905 if (old_head == NULL) {
1906 old_head = this;
1907 }
1908 // Try to install end of list and weak done tag.
1909 if (Atomic::cmpxchg(mark_link(old_head, claim_weak_done_tag), &_oops_do_mark_link, mark_link(this, claim_weak_request_tag)) == mark_link(this, claim_weak_request_tag)) {
1910 oops_do_log_change("oops_do, mark weak done");
1911 return NULL;
1912 } else {
1913 return old_head;
1914 }
1915 }
1916
1917 void nmethod::oops_do_add_to_list_as_strong_done() {
1918 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1919
1920 nmethod* old_head = Atomic::xchg(this, &_oops_do_mark_nmethods);
1921 // Self-loop if needed.
1922 if (old_head == NULL) {
1923 old_head = this;
1924 }
1925 assert(_oops_do_mark_link == mark_link(this, claim_strong_done_tag), "must be but is nmethod " PTR_FORMAT " state %u",
1926 p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
1927
1928 oops_do_set_strong_done(old_head);
1929 }
1930
1931 void nmethod::oops_do_process_weak(OopsDoProcessor* p) {
1932 if (!oops_do_try_claim_weak_request()) {
1933 // Failed to claim for weak processing.
1934 oops_do_log_change("oops_do, mark weak request fail");
1935 return;
1936 }
1937
1938 p->do_regular_processing(this);
1939
1940 nmethod* old_head = oops_do_try_add_to_list_as_weak_done();
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1883
1884 bool nmethod::oops_do_try_claim_weak_done_as_strong_done(nmethod::oops_do_mark_link* next) {
1885 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1886 assert(extract_state(next) == claim_weak_done_tag, "Should be claimed as weak done");
1887
1888 oops_do_mark_link* old_next = Atomic::cmpxchg(mark_link(extract_nmethod(next), claim_strong_done_tag), &_oops_do_mark_link, next);
1889 if (old_next == next) {
1890 oops_do_log_change("oops_do, mark weak done -> mark strong done");
1891 return true;
1892 }
1893 return false;
1894 }
1895
1896 nmethod* nmethod::oops_do_try_add_to_list_as_weak_done() {
1897 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1898
1899 assert(extract_state(_oops_do_mark_link) == claim_weak_request_tag ||
1900 extract_state(_oops_do_mark_link) == claim_strong_request_tag,
1901 "must be but is nmethod " PTR_FORMAT " %u", p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
1902
1903 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this);
1904 // Self-loop if needed.
1905 if (old_head == NULL) {
1906 old_head = this;
1907 }
1908 // Try to install end of list and weak done tag.
1909 if (Atomic::cmpxchg(mark_link(old_head, claim_weak_done_tag), &_oops_do_mark_link, mark_link(this, claim_weak_request_tag)) == mark_link(this, claim_weak_request_tag)) {
1910 oops_do_log_change("oops_do, mark weak done");
1911 return NULL;
1912 } else {
1913 return old_head;
1914 }
1915 }
1916
1917 void nmethod::oops_do_add_to_list_as_strong_done() {
1918 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
1919
1920 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this);
1921 // Self-loop if needed.
1922 if (old_head == NULL) {
1923 old_head = this;
1924 }
1925 assert(_oops_do_mark_link == mark_link(this, claim_strong_done_tag), "must be but is nmethod " PTR_FORMAT " state %u",
1926 p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
1927
1928 oops_do_set_strong_done(old_head);
1929 }
1930
1931 void nmethod::oops_do_process_weak(OopsDoProcessor* p) {
1932 if (!oops_do_try_claim_weak_request()) {
1933 // Failed to claim for weak processing.
1934 oops_do_log_change("oops_do, mark weak request fail");
1935 return;
1936 }
1937
1938 p->do_regular_processing(this);
1939
1940 nmethod* old_head = oops_do_try_add_to_list_as_weak_done();
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