Mercurial > hg > graal-compiler
annotate src/share/vm/code/vtableStubs.hpp @ 3992:d1bdeef3e3e2
7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76
Summary: There is a race between one thread successfully forwarding and copying the klass mirror for the SoftReference class (including the static master clock) and another thread attempting to use the master clock while attempting to discover a soft reference object. Maintain a shadow copy of the soft reference master clock and use the shadow during reference discovery and reference processing.
Reviewed-by: tonyp, brutisso, ysr
| author | johnc |
|---|---|
| date | Wed, 12 Oct 2011 10:25:51 -0700 |
| parents | c760f78e0a53 |
| children | 1d7922586cf6 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_CODE_VTABLESTUBS_HPP |
| 26 #define SHARE_VM_CODE_VTABLESTUBS_HPP | |
| 27 | |
|
1983
c760f78e0a53
7003125: precompiled.hpp is included when precompiled headers are not used
stefank
parents:
1972
diff
changeset
|
28 #include "code/vmreg.hpp" |
| 1972 | 29 #include "memory/allocation.hpp" |
| 30 | |
| 0 | 31 // A VtableStub holds an individual code stub for a pair (vtable index, #args) for either itables or vtables |
| 32 // There's a one-to-one relationship between a VtableStub and such a pair. | |
| 33 | |
| 34 class VtableStub { | |
| 35 private: | |
| 36 friend class VtableStubs; | |
| 37 | |
| 38 static address _chunk; // For allocation | |
| 39 static address _chunk_end; // For allocation | |
| 40 static VMReg _receiver_location; // Where to find receiver | |
| 41 | |
| 42 VtableStub* _next; // Pointer to next entry in hash table | |
| 43 const short _index; // vtable index | |
| 44 short _ame_offset; // Where an AbstractMethodError might occur | |
| 45 short _npe_offset; // Where a NullPointerException might occur | |
| 46 bool _is_vtable_stub; // True if vtable stub, false, is itable stub | |
| 47 /* code follows here */ // The vtableStub code | |
| 48 | |
| 49 void* operator new(size_t size, int code_size); | |
| 50 | |
| 51 VtableStub(bool is_vtable_stub, int index) | |
| 52 : _next(NULL), _is_vtable_stub(is_vtable_stub), | |
| 53 _index(index), _ame_offset(-1), _npe_offset(-1) {} | |
| 54 VtableStub* next() const { return _next; } | |
| 55 int index() const { return _index; } | |
| 56 static VMReg receiver_location() { return _receiver_location; } | |
| 57 void set_next(VtableStub* n) { _next = n; } | |
| 58 address code_begin() const { return (address)(this + 1); } | |
| 59 address code_end() const { return code_begin() + pd_code_size_limit(_is_vtable_stub); } | |
| 60 address entry_point() const { return code_begin(); } | |
| 61 static int entry_offset() { return sizeof(class VtableStub); } | |
| 62 | |
| 63 bool matches(bool is_vtable_stub, int index) const { | |
| 64 return _index == index && _is_vtable_stub == is_vtable_stub; | |
| 65 } | |
| 66 bool contains(address pc) const { return code_begin() <= pc && pc < code_end(); } | |
| 67 | |
| 68 void set_exception_points(address npe_addr, address ame_addr) { | |
| 69 _npe_offset = npe_addr - code_begin(); | |
| 70 _ame_offset = ame_addr - code_begin(); | |
| 71 assert(is_abstract_method_error(ame_addr), "offset must be correct"); | |
| 72 assert(is_null_pointer_exception(npe_addr), "offset must be correct"); | |
| 73 assert(!is_abstract_method_error(npe_addr), "offset must be correct"); | |
| 74 assert(!is_null_pointer_exception(ame_addr), "offset must be correct"); | |
| 75 } | |
| 76 | |
| 77 // platform-dependent routines | |
| 78 static int pd_code_size_limit(bool is_vtable_stub); | |
| 79 static int pd_code_alignment(); | |
| 80 // CNC: Removed because vtable stubs are now made with an ideal graph | |
| 81 // static bool pd_disregard_arg_size(); | |
| 82 | |
| 83 static void align_chunk() { | |
| 84 uintptr_t off = (uintptr_t)( _chunk + sizeof(VtableStub) ) % pd_code_alignment(); | |
| 85 if (off != 0) _chunk += pd_code_alignment() - off; | |
| 86 } | |
| 87 | |
| 88 public: | |
| 89 // Query | |
| 90 bool is_itable_stub() { return !_is_vtable_stub; } | |
| 91 bool is_vtable_stub() { return _is_vtable_stub; } | |
| 92 bool is_abstract_method_error(address epc) { return epc == code_begin()+_ame_offset; } | |
| 93 bool is_null_pointer_exception(address epc) { return epc == code_begin()+_npe_offset; } | |
| 94 | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1552
diff
changeset
|
95 void print_on(outputStream* st) const; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1552
diff
changeset
|
96 void print() const { print_on(tty); } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1552
diff
changeset
|
97 |
| 0 | 98 }; |
| 99 | |
| 100 | |
| 101 // VtableStubs creates the code stubs for compiled calls through vtables. | |
| 102 // There is one stub per (vtable index, args_size) pair, and the stubs are | |
| 103 // never deallocated. They don't need to be GCed because they contain no oops. | |
| 104 | |
| 105 class VtableStubs : AllStatic { | |
| 106 public: // N must be public (some compilers need this for _table) | |
| 107 enum { | |
| 108 N = 256, // size of stub table; must be power of two | |
| 109 mask = N - 1 | |
| 110 }; | |
| 111 | |
| 112 private: | |
| 113 static VtableStub* _table[N]; // table of existing stubs | |
| 114 static int _number_of_vtable_stubs; // number of stubs created so far (for statistics) | |
| 115 | |
| 116 static VtableStub* create_vtable_stub(int vtable_index); | |
| 117 static VtableStub* create_itable_stub(int vtable_index); | |
| 118 static VtableStub* lookup (bool is_vtable_stub, int vtable_index); | |
| 119 static void enter (bool is_vtable_stub, int vtable_index, VtableStub* s); | |
| 120 static inline uint hash (bool is_vtable_stub, int vtable_index); | |
| 121 | |
| 122 public: | |
| 123 static address create_stub(bool is_vtable_stub, int vtable_index, methodOop method); // return the entry point of a stub for this call | |
| 124 static bool is_entry_point(address pc); // is pc a vtable stub entry point? | |
| 125 static bool contains(address pc); // is pc within any stub? | |
| 126 static VtableStub* stub_containing(address pc); // stub containing pc or NULL | |
| 127 static int number_of_vtable_stubs() { return _number_of_vtable_stubs; } | |
| 128 static void initialize(); | |
| 129 }; | |
| 1972 | 130 |
| 131 #endif // SHARE_VM_CODE_VTABLESTUBS_HPP |