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8031818: Experimental VM flag for enforcing safe object construction

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-XX:+AlwaysSafeConstructors to unconditionally emit the trailing constructor barrier.

Reviewed-by: kvn, roland
This commit is contained in:
Aleksey Shipilev 2014-03-03 15:31:27 +04:00
parent c4bd0f58d3
commit 1d10b6813e
7 changed files with 74 additions and 22 deletions
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12
hotspot/src/share/vm/opto/parse3.cpp
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@ -334,13 +334,23 @@ void Parse::do_put_xxx(Node* obj, ciField* field, bool is_field) {
}
}
if (is_field) {
set_wrote_fields(true);
}
// If the field is final, the rules of Java say we are in <init> or <clinit>.
// Note the presence of writes to final non-static fields, so that we
// can insert a memory barrier later on to keep the writes from floating
// out of the constructor.
// Any method can write a @Stable field; insert memory barriers after those also.
if (is_field && (field->is_final() || field->is_stable())) {
set_wrote_final(true);
if (field->is_final()) {
set_wrote_final(true);
}
if (field->is_stable()) {
set_wrote_stable(true);
}
// Preserve allocation ptr to create precedent edge to it in membar
// generated on exit from constructor.
if (C->eliminate_boxing() &&