Mercurial > hg > graal-jvmci-8
annotate ASSEMBLY_EXCEPTION @ 12301:2c022e432e10
8024974: Incorrect use of GC_locker::is_active()
Summary: SymbolTable and StringTable can make calls to GC_locker::is_active() outside a safepoint. This isn't safe because the GC_locker active state (lock count) is only updated at a safepoint and only remains valid as long as _needs_gc is true. However, outside a safepoint_needs_gc can change to false at any time, which makes it impossible to do a correct call to is_active() in that context. In this case these calls can just be removed since the input argument to basic_add() should never be on the heap and so there's no need to check the GC_locker state. This change also adjusts the assert() in is_active() to makes sure all calls to this function are always done under a safepoint.
Reviewed-by: brutisso, dcubed
Contributed-by: per.liden@oracle.com
author | stefank |
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date | Fri, 20 Sep 2013 10:53:28 +0200 |
parents | c18cbe5936b8 |
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0 | 1 |
2 OPENJDK ASSEMBLY EXCEPTION | |
3 | |
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4 The OpenJDK source code made available by Oracle at openjdk.java.net and |
0 | 5 openjdk.dev.java.net ("OpenJDK Code") is distributed under the terms of the |
6 GNU General Public License <http://www.gnu.org/copyleft/gpl.html> version 2 | |
7 only ("GPL2"), with the following clarification and special exception. | |
8 | |
9 Linking this OpenJDK Code statically or dynamically with other code | |
10 is making a combined work based on this library. Thus, the terms | |
11 and conditions of GPL2 cover the whole combination. | |
12 | |
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13 As a special exception, Oracle gives you permission to link this |
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14 OpenJDK Code with certain code licensed by Oracle as indicated at |
0 | 15 http://openjdk.java.net/legal/exception-modules-2007-05-08.html |
16 ("Designated Exception Modules") to produce an executable, | |
17 regardless of the license terms of the Designated Exception Modules, | |
18 and to copy and distribute the resulting executable under GPL2, | |
19 provided that the Designated Exception Modules continue to be | |
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20 governed by the licenses under which they were offered by Oracle. |
0 | 21 |
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22 As such, it allows licensees and sublicensees of Oracle's GPL2 OpenJDK Code to |
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23 build an executable that includes those portions of necessary code that Oracle |
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24 could not provide under GPL2 (or that Oracle has provided under GPL2 with the |
0 | 25 Classpath exception). If you modify or add to the OpenJDK code, that new |
26 GPL2 code may still be combined with Designated Exception Modules if the | |
27 new code is made subject to this exception by its copyright holder. |