Mercurial > hg > truffle
annotate src/share/vm/runtime/unhandledOops.hpp @ 1721:413ad0331a0c
6977924: Changes for 6975078 produce build error with certain gcc versions
Summary: The changes introduced for 6975078 assign badHeapOopVal to the _allocation field in the ResourceObj class. In 32 bit linux builds with certain versions of gcc this assignment will be flagged as an error while compiling allocation.cpp. In 32 bit builds the constant value badHeapOopVal (which is cast to an intptr_t) is negative. The _allocation field is typed as an unsigned intptr_t and gcc catches this as an error.
Reviewed-by: jcoomes, ysr, phh
author | johnc |
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date | Wed, 18 Aug 2010 10:59:06 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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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 |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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20 * or visit www.oracle.com if you need additional information or have any |
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6941466: Oracle rebranding changes for Hotspot repositories
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21 * questions. |
0 | 22 * |
23 */ | |
24 #ifdef CHECK_UNHANDLED_OOPS | |
25 | |
26 // Detect unhanded oops in VM code | |
27 | |
28 // The design is that when an oop is declared on the stack as a local | |
29 // variable, the oop is actually a C++ struct with constructor and | |
30 // destructor. The constructor adds the oop address on a list | |
31 // off each thread and the destructor removes the oop. At a potential | |
32 // safepoint, the stack addresses of the local variable oops are trashed | |
33 // with a recognizeable value. If the local variable is used again, it | |
34 // will segfault, indicating an unsafe use of that oop. | |
35 // eg: | |
36 // oop o; //register &o on list | |
37 // funct(); // if potential safepoint - causes clear_naked_oops() | |
38 // // which trashes o above. | |
39 // o->do_something(); // Crashes because o is unsafe. | |
40 // | |
41 // This code implements the details of the unhandled oop list on the thread. | |
42 // | |
43 | |
44 class oop; | |
45 class Thread; | |
46 | |
47 class UnhandledOopEntry { | |
48 friend class UnhandledOops; | |
49 private: | |
50 oop* _oop_ptr; | |
51 bool _ok_for_gc; | |
52 address _pc; | |
53 public: | |
54 oop* oop_ptr() { return _oop_ptr; } | |
55 UnhandledOopEntry() : _oop_ptr(NULL), _ok_for_gc(false), _pc(NULL) {} | |
56 UnhandledOopEntry(oop* op, address pc) : | |
57 _oop_ptr(op), _ok_for_gc(false), _pc(pc) {} | |
58 }; | |
59 | |
60 | |
61 class UnhandledOops { | |
62 friend class Thread; | |
63 private: | |
64 Thread* _thread; | |
65 int _level; | |
66 GrowableArray<UnhandledOopEntry> *_oop_list; | |
67 void allow_unhandled_oop(oop* op); | |
68 void clear_unhandled_oops(); | |
69 UnhandledOops(Thread* thread); | |
70 ~UnhandledOops(); | |
71 | |
72 public: | |
73 static void dump_oops(UnhandledOops* list); | |
74 void register_unhandled_oop(oop* op, address pc); | |
75 void unregister_unhandled_oop(oop* op); | |
76 }; | |
77 | |
78 #ifdef _LP64 | |
79 const intptr_t BAD_OOP_ADDR = 0xfffffffffffffff1; | |
80 #else | |
81 const intptr_t BAD_OOP_ADDR = 0xfffffff1; | |
82 #endif // _LP64 | |
83 #endif // CHECK_UNHANDLED_OOPS |