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8253180: ZGC: Implementation of JEP 376: ZGC: Concurrent Thread-Stack Processing

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Reviewed-by: stefank, pliden, rehn, neliasso, coleenp, smonteith
This commit is contained in:
Erik Österlund 2020-10-09 08:40:33 +00:00
parent a2f651904d
commit b9873e1833
131 changed files with 2428 additions and 572 deletions
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14
src/hotspot/share/runtime/deoptimization.cpp
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@ -61,6 +61,7 @@
#include "runtime/safepointVerifiers.hpp"
#include "runtime/sharedRuntime.hpp"
#include "runtime/signature.hpp"
#include "runtime/stackWatermarkSet.hpp"
#include "runtime/stubRoutines.hpp"
#include "runtime/thread.hpp"
#include "runtime/threadSMR.hpp"
@ -160,6 +161,13 @@ JRT_BLOCK_ENTRY(Deoptimization::UnrollBlock*, Deoptimization::fetch_unroll_info(
}
thread->inc_in_deopt_handler();
if (exec_mode == Unpack_exception) {
// When we get here, a callee has thrown an exception into a deoptimized
// frame. That throw might have deferred stack watermark checking until
// after unwinding. So we deal with such deferred requests here.
StackWatermarkSet::after_unwind(thread);
}
return fetch_unroll_info_helper(thread, exec_mode);
JRT_END
@ -254,6 +262,10 @@ static void eliminate_locks(JavaThread* thread, GrowableArray<compiledVFrame*>*
// This is factored, since it is both called from a JRT_LEAF (deoptimization) and a JRT_ENTRY (uncommon_trap)
Deoptimization::UnrollBlock* Deoptimization::fetch_unroll_info_helper(JavaThread* thread, int exec_mode) {
// When we get here we are about to unwind the deoptee frame. In order to
// catch not yet safe to use frames, the following stack watermark barrier
// poll will make such frames safe to use.
StackWatermarkSet::before_unwind(thread);
// Note: there is a safepoint safety issue here. No matter whether we enter
// via vanilla deopt or uncommon trap we MUST NOT stop at a safepoint once
@ -1510,7 +1522,7 @@ static void get_monitors_from_stack(GrowableArray<Handle>* objects_to_revoke, Ja
// the places we want to call this routine so we need to walk the
// stack again to update the register map.
if (map == NULL || !map->update_map()) {
StackFrameStream sfs(thread, true);
StackFrameStream sfs(thread, true /* update */, true /* process_frames */);
bool found = false;
while (!found && !sfs.is_done()) {
frame* cur = sfs.current();