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src/share/vm/code/vtableStubs.hpp@f90c822e73f8 (annotated)

src/share/vm/code/vtableStubs.hpp

Wed, 27 Apr 2016 01:25:04 +0800

author
aoqi
date
Wed, 27 Apr 2016 01:25:04 +0800
changeset 0
f90c822e73f8
child 6876
710a3c8b516e
permissions
-rw-r--r--

Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

aoqi@0 1 /*
aoqi@0 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0 4 *
aoqi@0 5 * This code is free software; you can redistribute it and/or modify it
aoqi@0 6 * under the terms of the GNU General Public License version 2 only, as
aoqi@0 7 * published by the Free Software Foundation.
aoqi@0 8 *
aoqi@0 9 * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0 12 * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0 13 * accompanied this code).
aoqi@0 14 *
aoqi@0 15 * You should have received a copy of the GNU General Public License version
aoqi@0 16 * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0 18 *
aoqi@0 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0 20 * or visit www.oracle.com if you need additional information or have any
aoqi@0 21 * questions.
aoqi@0 22 *
aoqi@0 23 */
aoqi@0 24
aoqi@0 25 #ifndef SHARE_VM_CODE_VTABLESTUBS_HPP
aoqi@0 26 #define SHARE_VM_CODE_VTABLESTUBS_HPP
aoqi@0 27
aoqi@0 28 #include "code/vmreg.hpp"
aoqi@0 29 #include "memory/allocation.hpp"
aoqi@0 30
aoqi@0 31 // A VtableStub holds an individual code stub for a pair (vtable index, #args) for either itables or vtables
aoqi@0 32 // There's a one-to-one relationship between a VtableStub and such a pair.
aoqi@0 33
aoqi@0 34 class VtableStub {
aoqi@0 35 private:
aoqi@0 36 friend class VtableStubs;
aoqi@0 37
aoqi@0 38 static address _chunk; // For allocation
aoqi@0 39 static address _chunk_end; // For allocation
aoqi@0 40 static VMReg _receiver_location; // Where to find receiver
aoqi@0 41
aoqi@0 42 VtableStub* _next; // Pointer to next entry in hash table
aoqi@0 43 const short _index; // vtable index
aoqi@0 44 short _ame_offset; // Where an AbstractMethodError might occur
aoqi@0 45 short _npe_offset; // Where a NullPointerException might occur
aoqi@0 46 bool _is_vtable_stub; // True if vtable stub, false, is itable stub
aoqi@0 47 /* code follows here */ // The vtableStub code
aoqi@0 48
aoqi@0 49 void* operator new(size_t size, int code_size) throw();
aoqi@0 50
aoqi@0 51 VtableStub(bool is_vtable_stub, int index)
aoqi@0 52 : _next(NULL), _is_vtable_stub(is_vtable_stub),
aoqi@0 53 _index(index), _ame_offset(-1), _npe_offset(-1) {}
aoqi@0 54 VtableStub* next() const { return _next; }
aoqi@0 55 int index() const { return _index; }
aoqi@0 56 static VMReg receiver_location() { return _receiver_location; }
aoqi@0 57 void set_next(VtableStub* n) { _next = n; }
aoqi@0 58
aoqi@0 59 public:
aoqi@0 60 address code_begin() const { return (address)(this + 1); }
aoqi@0 61 address code_end() const { return code_begin() + pd_code_size_limit(_is_vtable_stub); }
aoqi@0 62 address entry_point() const { return code_begin(); }
aoqi@0 63 static int entry_offset() { return sizeof(class VtableStub); }
aoqi@0 64
aoqi@0 65 bool matches(bool is_vtable_stub, int index) const {
aoqi@0 66 return _index == index && _is_vtable_stub == is_vtable_stub;
aoqi@0 67 }
aoqi@0 68 bool contains(address pc) const { return code_begin() <= pc && pc < code_end(); }
aoqi@0 69
aoqi@0 70 private:
aoqi@0 71 void set_exception_points(address npe_addr, address ame_addr) {
aoqi@0 72 _npe_offset = npe_addr - code_begin();
aoqi@0 73 _ame_offset = ame_addr - code_begin();
aoqi@0 74 assert(is_abstract_method_error(ame_addr), "offset must be correct");
aoqi@0 75 assert(is_null_pointer_exception(npe_addr), "offset must be correct");
aoqi@0 76 assert(!is_abstract_method_error(npe_addr), "offset must be correct");
aoqi@0 77 assert(!is_null_pointer_exception(ame_addr), "offset must be correct");
aoqi@0 78 }
aoqi@0 79
aoqi@0 80 // platform-dependent routines
aoqi@0 81 static int pd_code_size_limit(bool is_vtable_stub);
aoqi@0 82 static int pd_code_alignment();
aoqi@0 83 // CNC: Removed because vtable stubs are now made with an ideal graph
aoqi@0 84 // static bool pd_disregard_arg_size();
aoqi@0 85
aoqi@0 86 static void align_chunk() {
aoqi@0 87 uintptr_t off = (uintptr_t)( _chunk + sizeof(VtableStub) ) % pd_code_alignment();
aoqi@0 88 if (off != 0) _chunk += pd_code_alignment() - off;
aoqi@0 89 }
aoqi@0 90
aoqi@0 91 public:
aoqi@0 92 // Query
aoqi@0 93 bool is_itable_stub() { return !_is_vtable_stub; }
aoqi@0 94 bool is_vtable_stub() { return _is_vtable_stub; }
aoqi@0 95 bool is_abstract_method_error(address epc) { return epc == code_begin()+_ame_offset; }
aoqi@0 96 bool is_null_pointer_exception(address epc) { return epc == code_begin()+_npe_offset; }
aoqi@0 97
aoqi@0 98 void print_on(outputStream* st) const;
aoqi@0 99 void print() const { print_on(tty); }
aoqi@0 100
aoqi@0 101 };
aoqi@0 102
aoqi@0 103
aoqi@0 104 // VtableStubs creates the code stubs for compiled calls through vtables.
aoqi@0 105 // There is one stub per (vtable index, args_size) pair, and the stubs are
aoqi@0 106 // never deallocated. They don't need to be GCed because they contain no oops.
aoqi@0 107
aoqi@0 108 class VtableStubs : AllStatic {
aoqi@0 109 public: // N must be public (some compilers need this for _table)
aoqi@0 110 enum {
aoqi@0 111 N = 256, // size of stub table; must be power of two
aoqi@0 112 mask = N - 1
aoqi@0 113 };
aoqi@0 114
aoqi@0 115 private:
aoqi@0 116 static VtableStub* _table[N]; // table of existing stubs
aoqi@0 117 static int _number_of_vtable_stubs; // number of stubs created so far (for statistics)
aoqi@0 118
aoqi@0 119 static VtableStub* create_vtable_stub(int vtable_index);
aoqi@0 120 static VtableStub* create_itable_stub(int vtable_index);
aoqi@0 121 static VtableStub* lookup (bool is_vtable_stub, int vtable_index);
aoqi@0 122 static void enter (bool is_vtable_stub, int vtable_index, VtableStub* s);
aoqi@0 123 static inline uint hash (bool is_vtable_stub, int vtable_index);
aoqi@0 124 static address find_stub (bool is_vtable_stub, int vtable_index);
aoqi@0 125
aoqi@0 126 public:
aoqi@0 127 static address find_vtable_stub(int vtable_index) { return find_stub(true, vtable_index); }
aoqi@0 128 static address find_itable_stub(int itable_index) { return find_stub(false, itable_index); }
aoqi@0 129 static bool is_entry_point(address pc); // is pc a vtable stub entry point?
aoqi@0 130 static bool contains(address pc); // is pc within any stub?
aoqi@0 131 static VtableStub* stub_containing(address pc); // stub containing pc or NULL
aoqi@0 132 static int number_of_vtable_stubs() { return _number_of_vtable_stubs; }
aoqi@0 133 static void initialize();
aoqi@0 134 static void vtable_stub_do(void f(VtableStub*)); // iterates over all vtable stubs
aoqi@0 135 };
aoqi@0 136
aoqi@0 137 #endif // SHARE_VM_CODE_VTABLESTUBS_HPP

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