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8252754: Hash code calculation of JfrStackTrace is inconsistent

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Reviewed-by: egahlin
This commit is contained in:
Jaroslav Bachorik 2020-09-03 13:22:52 +02:00
parent 35ea00085f
commit 43d36857d0
1 changed files with 4 additions and 1 deletions
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5
src/hotspot/share/jfr/recorder/stacktrace/jfrStackTrace.cpp
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@ -180,6 +180,7 @@ bool JfrStackTrace::record_thread(JavaThread& thread, frame& frame) {
u4 count = 0;
_reached_root = true;
_hash = 1;
while (!st.at_end()) {
if (count >= _max_frames) {
_reached_root = false;
@ -201,7 +202,9 @@ bool JfrStackTrace::record_thread(JavaThread& thread, frame& frame) {
}
const int lineno = method->line_number_from_bci(bci);
// Can we determine if it's inlined?
_hash = (_hash << 2) + (unsigned int)(((size_t)mid >> 2) + (bci << 4) + type);
_hash = (_hash * 31) + mid;
_hash = (_hash * 31) + bci;
_hash = (_hash * 31) + type;
_frames[count] = JfrStackFrame(mid, bci, type, lineno, method->method_holder());
st.samples_next();
count++;