stan/jdk-24
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

8155643: Java crash with assert in Xcomp mode and disabled ReduceInitialCardMarks

Browse Source 
We should not emit a subtype check for CloneOop arraycopy.

Reviewed-by: kvn
This commit is contained in:
Tobias Hartmann 2016-05-12 08:23:25 +02:00
parent 536db8741f
commit cf5a61530f
2 changed files with 81 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
hotspot/src/share/vm/opto/macroArrayCopy.cpp
View File

@ -503,6 +503,10 @@ Node* PhaseMacroExpand::generate_arraycopy(ArrayCopyNode *ac, AllocateArrayNode*
// further to JVM_ArrayCopy on the first per-oop check that fails. // further to JVM_ArrayCopy on the first per-oop check that fails.
// (Actually, we don't move raw bits only; the GC requires card marks.) // (Actually, we don't move raw bits only; the GC requires card marks.)
// We don't need a subtype check for validated copies and Object[].clone()
bool skip_subtype_check = ac->is_arraycopy_validated() || ac->is_copyof_validated() ||
ac->is_copyofrange_validated() || ac->is_cloneoop();
if (!skip_subtype_check) {
// Get the klass* for both src and dest // Get the klass* for both src and dest
Node* src_klass = ac->in(ArrayCopyNode::SrcKlass); Node* src_klass = ac->in(ArrayCopyNode::SrcKlass);
Node* dest_klass = ac->in(ArrayCopyNode::DestKlass); Node* dest_klass = ac->in(ArrayCopyNode::DestKlass);
@ -520,8 +524,7 @@ Node* PhaseMacroExpand::generate_arraycopy(ArrayCopyNode *ac, AllocateArrayNode*
// Test S[] against D[], not S against D, because (probably) // Test S[] against D[], not S against D, because (probably)
// the secondary supertype cache is less busy for S[] than S. // the secondary supertype cache is less busy for S[] than S.
// This usually only matters when D is an interface. // This usually only matters when D is an interface.
Node* not_subtype_ctrl = (ac->is_arraycopy_validated() || ac->is_copyof_validated() || ac->is_copyofrange_validated()) ? top() : Node* not_subtype_ctrl = Phase::gen_subtype_check(src_klass, dest_klass, ctrl, mem, &_igvn);
Phase::gen_subtype_check(src_klass, dest_klass, ctrl, mem, &_igvn);
// Plug failing path into checked_oop_disjoint_arraycopy // Plug failing path into checked_oop_disjoint_arraycopy
if (not_subtype_ctrl != top()) { if (not_subtype_ctrl != top()) {
Node* local_ctrl = not_subtype_ctrl; Node* local_ctrl = not_subtype_ctrl;
@ -544,6 +547,7 @@ Node* PhaseMacroExpand::generate_arraycopy(ArrayCopyNode *ac, AllocateArrayNode*
checked_mem = local_mem->memory_at(alias_idx); checked_mem = local_mem->memory_at(alias_idx);
checked_value = cv; checked_value = cv;
} }
}
// At this point we know we do not need type checks on oop stores. // At this point we know we do not need type checks on oop stores.
// Let's see if we need card marks: // Let's see if we need card marks:

40
hotspot/test/compiler/arraycopy/TestObjectArrayClone.java Normal file
View File

@ -0,0 +1,40 @@
/*
* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 8155643
* @summary Test Object.clone() intrinsic if ReduceInitialCardMarks is disabled.
* @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -Xcomp -XX:CompileOnly=TestObjectArrayClone.test -XX:-ReduceInitialCardMarks TestObjectArrayClone
*/
public class TestObjectArrayClone {
public static TestObjectArrayClone[] test(TestObjectArrayClone[] arr) {
return arr.clone();
}
public static void main(String[] args) {
test(new TestObjectArrayClone[42]);
}
}