Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiManageCapabilities.hpp @ 1716:be3f9c242c9d
6948538: CMS: BOT walkers can fall into object allocation and initialization cracks
Summary: GC workers now recognize an intermediate transient state of blocks which are allocated but have not yet completed initialization. blk_start() calls do not attempt to determine the size of a block in the transient state, rather waiting for the block to become initialized so that it is safe to query its size. Audited and ensured the order of initialization of object fields (klass, free bit and size) to respect block state transition protocol. Also included some new assertion checking code enabled in debug mode.
Reviewed-by: chrisphi, johnc, poonam
| author | ysr |
|---|---|
| date | Mon, 16 Aug 2010 15:58:42 -0700 |
| parents | c18cbe5936b8 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 #ifndef _JAVA_JVMTI_MANAGE_CAPABILITIES_H_ | |
| 26 #define _JAVA_JVMTI_MANAGE_CAPABILITIES_H_ | |
| 27 | |
| 28 | |
| 29 | |
| 30 class JvmtiManageCapabilities : public AllStatic { | |
| 31 | |
| 32 private: | |
| 33 | |
| 34 // these four capabilities sets represent all potentially | |
| 35 // available capabilities. They are disjoint, covering | |
| 36 // the four cases: (OnLoad vs OnLoad+live phase) X | |
| 37 // (one environment vs any environment). | |
| 38 static jvmtiCapabilities always_capabilities; | |
| 39 static jvmtiCapabilities onload_capabilities; | |
| 40 static jvmtiCapabilities always_solo_capabilities; | |
| 41 static jvmtiCapabilities onload_solo_capabilities; | |
| 42 | |
| 43 // solo capabilities that have not been grabbed | |
| 44 static jvmtiCapabilities always_solo_remaining_capabilities; | |
| 45 static jvmtiCapabilities onload_solo_remaining_capabilities; | |
| 46 | |
| 47 // all capabilities ever acquired | |
| 48 static jvmtiCapabilities acquired_capabilities; | |
| 49 | |
| 50 // basic intenal operations | |
| 51 static jvmtiCapabilities *either(const jvmtiCapabilities *a, const jvmtiCapabilities *b, jvmtiCapabilities *result); | |
| 52 static jvmtiCapabilities *both(const jvmtiCapabilities *a, const jvmtiCapabilities *b, jvmtiCapabilities *result); | |
| 53 static jvmtiCapabilities *exclude(const jvmtiCapabilities *a, const jvmtiCapabilities *b, jvmtiCapabilities *result); | |
| 54 static bool has_some(const jvmtiCapabilities *a); | |
| 55 static void update(); | |
| 56 | |
| 57 // init functions | |
| 58 static jvmtiCapabilities init_always_capabilities(); | |
| 59 static jvmtiCapabilities init_onload_capabilities(); | |
| 60 static jvmtiCapabilities init_always_solo_capabilities(); | |
| 61 static jvmtiCapabilities init_onload_solo_capabilities(); | |
| 62 | |
| 63 public: | |
| 64 static void initialize(); | |
| 65 | |
| 66 // may have to adjust always capabilities when VM initialization has completed | |
| 67 static void recompute_always_capabilities(); | |
| 68 | |
| 69 // queries and actions | |
| 70 static void get_potential_capabilities(const jvmtiCapabilities *current, | |
| 71 const jvmtiCapabilities *prohibited, | |
| 72 jvmtiCapabilities *result); | |
| 73 static jvmtiError add_capabilities(const jvmtiCapabilities *current, | |
| 74 const jvmtiCapabilities *prohibited, | |
| 75 const jvmtiCapabilities *desired, | |
| 76 jvmtiCapabilities *result); | |
| 77 static void relinquish_capabilities(const jvmtiCapabilities *current, | |
| 78 const jvmtiCapabilities *unwanted, | |
| 79 jvmtiCapabilities *result); | |
| 80 static void copy_capabilities(const jvmtiCapabilities *from, jvmtiCapabilities *to); | |
| 81 | |
| 82 #ifndef PRODUCT | |
| 83 static void print(const jvmtiCapabilities* caps); | |
| 84 #endif | |
| 85 }; | |
| 86 | |
| 87 #endif /* _JAVA_JVMTI_MANAGE_CAPABILITIES_H_ */ |