Mercurial > hg > truffle
annotate src/share/vm/code/vtableStubs.hpp @ 14714:b602356a9cfc
additional canonicalizers for accesses and value nodes (improves number of implicit null checks)
author | Lukas Stadler <lukas.stadler@oracle.com> |
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date | Thu, 20 Mar 2014 17:15:36 +0100 |
parents | 9341a9963d36 |
children | 4ca6dc0799b6 |
rev | line source |
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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 |