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1 /*
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2 * Copyright 1997-2003 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 //
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26 // For CompiledIC's:
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27 //
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28 // In cases where we do not have MT-safe state transformation,
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29 // we go to a transition state, using ICStubs. At a safepoint,
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30 // the inline caches are transferred from the transitional code:
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31 //
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32 // instruction_address --> 01 set xxx_oop, Ginline_cache_klass
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33 // 23 jump_to Gtemp, yyyy
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34 // 4 nop
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35
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36 class ICStub: public Stub {
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37 private:
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38 int _size; // total size of the stub incl. code
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39 address _ic_site; // points at call instruction of owning ic-buffer
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40 /* stub code follows here */
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41 protected:
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42 friend class ICStubInterface;
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43 // This will be called only by ICStubInterface
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44 void initialize(int size) { _size = size; _ic_site = NULL; }
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45 void finalize(); // called when a method is removed
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46
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47 // General info
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48 int size() const { return _size; }
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49 static int code_size_to_size(int code_size) { return round_to(sizeof(ICStub), CodeEntryAlignment) + code_size; }
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50
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51 public:
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52 // Creation
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53 void set_stub(CompiledIC *ic, oop cached_value, address dest_addr);
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54
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55 // Code info
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56 address code_begin() const { return (address)this + round_to(sizeof(ICStub), CodeEntryAlignment); }
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57 address code_end() const { return (address)this + size(); }
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58
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59 // Call site info
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60 address ic_site() const { return _ic_site; }
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61 void clear();
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62 bool is_empty() const { return _ic_site == NULL; }
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63
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64 // stub info
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65 address destination() const; // destination of jump instruction
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66 oop cached_oop() const; // cached_oop for stub
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67
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68 // Debugging
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69 void verify() PRODUCT_RETURN;
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70 void print() PRODUCT_RETURN;
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71
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72 // Creation
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73 friend ICStub* ICStub_from_destination_address(address destination_address);
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74 };
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75
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76 // ICStub Creation
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77 inline ICStub* ICStub_from_destination_address(address destination_address) {
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78 ICStub* stub = (ICStub*) (destination_address - round_to(sizeof(ICStub), CodeEntryAlignment));
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79 #ifdef ASSERT
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80 stub->verify();
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81 #endif
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82 return stub;
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83 }
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84
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85 class InlineCacheBuffer: public AllStatic {
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86 private:
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87 // friends
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88 friend class ICStub;
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89
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90 static int ic_stub_code_size();
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91
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92 static StubQueue* _buffer;
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93 static ICStub* _next_stub;
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94
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95 static StubQueue* buffer() { return _buffer; }
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96 static void set_next_stub(ICStub* next_stub) { _next_stub = next_stub; }
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97 static ICStub* get_next_stub() { return _next_stub; }
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98
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99 static void init_next_stub();
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100
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101 static ICStub* new_ic_stub();
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102
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103
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104 // Machine-dependent implementation of ICBuffer
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105 static void assemble_ic_buffer_code(address code_begin, oop cached_oop, address entry_point);
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106 static address ic_buffer_entry_point (address code_begin);
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107 static oop ic_buffer_cached_oop (address code_begin);
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108
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109 public:
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110
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111 // Initialization; must be called before first usage
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112 static void initialize();
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113
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114 // Access
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115 static bool contains(address instruction_address);
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116
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117 // removes the ICStubs after backpatching
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118 static void update_inline_caches();
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119
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120 // for debugging
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121 static bool is_empty();
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122
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123
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124 // New interface
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125 static void create_transition_stub(CompiledIC *ic, oop cached_oop, address entry);
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126 static address ic_destination_for(CompiledIC *ic);
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127 static oop cached_oop_for(CompiledIC *ic);
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128 };
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