Mercurial > hg > truffle
annotate src/share/vm/code/vtableStubs.hpp @ 20543:e7d0505c8a30
8059758: Footprint regressions with JDK-8038423
Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything.
Reviewed-by: jwilhelm, brutisso
| author | tschatzl |
|---|---|
| date | Fri, 10 Oct 2014 15:51:58 +0200 |
| parents | 22b3b2f888bc |
| children | 4ca6dc0799b6 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2013, 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 * | |
|
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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 | |
| 1972 | 25 #ifndef SHARE_VM_CODE_VTABLESTUBS_HPP |
| 26 #define SHARE_VM_CODE_VTABLESTUBS_HPP | |
| 27 | |
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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 | |
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49 void* operator new(size_t size, int code_size) throw(); |
| 0 | 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; } | |
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58 |
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59 public: |
| 0 | 60 address code_begin() const { return (address)(this + 1); } |
| 61 address code_end() const { return code_begin() + pd_code_size_limit(_is_vtable_stub); } | |
| 62 address entry_point() const { return code_begin(); } | |
| 63 static int entry_offset() { return sizeof(class VtableStub); } | |
| 64 | |
| 65 bool matches(bool is_vtable_stub, int index) const { | |
| 66 return _index == index && _is_vtable_stub == is_vtable_stub; | |
| 67 } | |
| 68 bool contains(address pc) const { return code_begin() <= pc && pc < code_end(); } | |
| 69 | |
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70 private: |
| 0 | 71 void set_exception_points(address npe_addr, address ame_addr) { |
| 72 _npe_offset = npe_addr - code_begin(); | |
| 73 _ame_offset = ame_addr - code_begin(); | |
| 74 assert(is_abstract_method_error(ame_addr), "offset must be correct"); | |
| 75 assert(is_null_pointer_exception(npe_addr), "offset must be correct"); | |
| 76 assert(!is_abstract_method_error(npe_addr), "offset must be correct"); | |
| 77 assert(!is_null_pointer_exception(ame_addr), "offset must be correct"); | |
| 78 } | |
| 79 | |
| 80 // platform-dependent routines | |
| 81 static int pd_code_size_limit(bool is_vtable_stub); | |
| 82 static int pd_code_alignment(); | |
| 83 // CNC: Removed because vtable stubs are now made with an ideal graph | |
| 84 // static bool pd_disregard_arg_size(); | |
| 85 | |
| 86 static void align_chunk() { | |
| 87 uintptr_t off = (uintptr_t)( _chunk + sizeof(VtableStub) ) % pd_code_alignment(); | |
| 88 if (off != 0) _chunk += pd_code_alignment() - off; | |
| 89 } | |
| 90 | |
| 91 public: | |
| 92 // Query | |
| 93 bool is_itable_stub() { return !_is_vtable_stub; } | |
| 94 bool is_vtable_stub() { return _is_vtable_stub; } | |
| 95 bool is_abstract_method_error(address epc) { return epc == code_begin()+_ame_offset; } | |
| 96 bool is_null_pointer_exception(address epc) { return epc == code_begin()+_npe_offset; } | |
| 97 | |
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98 void print_on(outputStream* st) const; |
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99 void print() const { print_on(tty); } |
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100 |
| 0 | 101 }; |
| 102 | |
| 103 | |
| 104 // VtableStubs creates the code stubs for compiled calls through vtables. | |
| 105 // There is one stub per (vtable index, args_size) pair, and the stubs are | |
| 106 // never deallocated. They don't need to be GCed because they contain no oops. | |
| 107 | |
| 108 class VtableStubs : AllStatic { | |
| 109 public: // N must be public (some compilers need this for _table) | |
| 110 enum { | |
| 111 N = 256, // size of stub table; must be power of two | |
| 112 mask = N - 1 | |
| 113 }; | |
| 114 | |
| 115 private: | |
| 116 static VtableStub* _table[N]; // table of existing stubs | |
| 117 static int _number_of_vtable_stubs; // number of stubs created so far (for statistics) | |
| 118 | |
| 119 static VtableStub* create_vtable_stub(int vtable_index); | |
| 120 static VtableStub* create_itable_stub(int vtable_index); | |
| 121 static VtableStub* lookup (bool is_vtable_stub, int vtable_index); | |
| 122 static void enter (bool is_vtable_stub, int vtable_index, VtableStub* s); | |
| 123 static inline uint hash (bool is_vtable_stub, int vtable_index); | |
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124 static address find_stub (bool is_vtable_stub, int vtable_index); |
| 0 | 125 |
| 126 public: | |
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127 static address find_vtable_stub(int vtable_index) { return find_stub(true, vtable_index); } |
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128 static address find_itable_stub(int itable_index) { return find_stub(false, itable_index); } |
| 0 | 129 static bool is_entry_point(address pc); // is pc a vtable stub entry point? |
| 130 static bool contains(address pc); // is pc within any stub? | |
| 131 static VtableStub* stub_containing(address pc); // stub containing pc or NULL | |
| 132 static int number_of_vtable_stubs() { return _number_of_vtable_stubs; } | |
| 133 static void initialize(); | |
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134 static void vtable_stub_do(void f(VtableStub*)); // iterates over all vtable stubs |
| 0 | 135 }; |
| 1972 | 136 |
| 137 #endif // SHARE_VM_CODE_VTABLESTUBS_HPP |