0
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1 /*
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2 * Copyright 1997-2007 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 // This class is used internally by nmethods, to cache
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26 // exception/pc/handler information.
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27
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28 class ExceptionCache : public CHeapObj {
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29 friend class VMStructs;
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30 private:
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31 static address _unwind_handler;
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32 enum { cache_size = 16 };
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33 klassOop _exception_type;
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34 address _pc[cache_size];
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35 address _handler[cache_size];
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36 int _count;
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37 ExceptionCache* _next;
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38
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39 address pc_at(int index) { assert(index >= 0 && index < count(),""); return _pc[index]; }
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40 void set_pc_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _pc[index] = a; }
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41 address handler_at(int index) { assert(index >= 0 && index < count(),""); return _handler[index]; }
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42 void set_handler_at(int index, address a) { assert(index >= 0 && index < cache_size,""); _handler[index] = a; }
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43 int count() { return _count; }
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44 void increment_count() { _count++; }
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45
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46 public:
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47
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48 ExceptionCache(Handle exception, address pc, address handler);
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49
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50 klassOop exception_type() { return _exception_type; }
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51 klassOop* exception_type_addr() { return &_exception_type; }
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52 ExceptionCache* next() { return _next; }
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53 void set_next(ExceptionCache *ec) { _next = ec; }
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54
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55 address match(Handle exception, address pc);
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56 bool match_exception_with_space(Handle exception) ;
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57 address test_address(address addr);
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58 bool add_address_and_handler(address addr, address handler) ;
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59
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60 static address unwind_handler() { return _unwind_handler; }
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61 };
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62
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63
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64 // cache pc descs found in earlier inquiries
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65 class PcDescCache VALUE_OBJ_CLASS_SPEC {
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66 friend class VMStructs;
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67 private:
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68 enum { cache_size = 4 };
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69 PcDesc* _last_pc_desc; // most recent pc_desc found
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70 PcDesc* _pc_descs[cache_size]; // last cache_size pc_descs found
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71 public:
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72 PcDescCache() { debug_only(_last_pc_desc = NULL); }
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73 void reset_to(PcDesc* initial_pc_desc);
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74 PcDesc* find_pc_desc(int pc_offset, bool approximate);
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75 void add_pc_desc(PcDesc* pc_desc);
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76 PcDesc* last_pc_desc() { return _last_pc_desc; }
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77 };
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78
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79
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80 // nmethods (native methods) are the compiled code versions of Java methods.
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81
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82 struct nmFlags {
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83 friend class VMStructs;
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84 unsigned int version:8; // version number (0 = first version)
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85 unsigned int level:4; // optimization level
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86 unsigned int age:4; // age (in # of sweep steps)
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87
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88 unsigned int state:2; // {alive, zombie, unloaded)
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89
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90 unsigned int isUncommonRecompiled:1; // recompiled because of uncommon trap?
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91 unsigned int isToBeRecompiled:1; // to be recompiled as soon as it matures
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92 unsigned int hasFlushedDependencies:1; // Used for maintenance of dependencies
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93 unsigned int markedForReclamation:1; // Used by NMethodSweeper
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94
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95 unsigned int has_unsafe_access:1; // May fault due to unsafe access.
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96
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97 void clear();
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98 };
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99
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100
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101 // A nmethod contains:
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102 // - header (the nmethod structure)
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103 // [Relocation]
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104 // - relocation information
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105 // - constant part (doubles, longs and floats used in nmethod)
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106 // [Code]
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107 // - code body
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108 // - exception handler
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109 // - stub code
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110 // [Debugging information]
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111 // - oop array
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112 // - data array
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113 // - pcs
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114 // [Exception handler table]
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115 // - handler entry point array
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116 // [Implicit Null Pointer exception table]
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117 // - implicit null table array
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118
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119 class Dependencies;
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120 class ExceptionHandlerTable;
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121 class ImplicitExceptionTable;
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122 class AbstractCompiler;
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123 class xmlStream;
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124
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125 class nmethod : public CodeBlob {
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126 friend class VMStructs;
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127 friend class NMethodSweeper;
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128 private:
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129 // Shared fields for all nmethod's
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130 static int _zombie_instruction_size;
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131
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132 methodOop _method;
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133 int _entry_bci; // != InvocationEntryBci if this nmethod is an on-stack replacement method
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134
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135 nmethod* _link; // To support simple linked-list chaining of nmethods
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136
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137 AbstractCompiler* _compiler; // The compiler which compiled this nmethod
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138
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139 // Offsets for different nmethod parts
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140 int _exception_offset;
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141 // All deoptee's will resume execution at this location described by this offset
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142 int _deoptimize_offset;
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143 int _stub_offset;
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144 int _consts_offset;
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145 int _scopes_data_offset;
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146 int _scopes_pcs_offset;
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147 int _dependencies_offset;
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148 int _handler_table_offset;
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149 int _nul_chk_table_offset;
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150 int _nmethod_end_offset;
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151
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152 // location in frame (offset for sp) that deopt can store the original
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153 // pc during a deopt.
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154 int _orig_pc_offset;
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155
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156 int _compile_id; // which compilation made this nmethod
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157 int _comp_level; // compilation level
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158
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159 // offsets for entry points
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160 address _entry_point; // entry point with class check
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161 address _verified_entry_point; // entry point without class check
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162 address _osr_entry_point; // entry point for on stack replacement
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163
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164 nmFlags flags; // various flags to keep track of nmethod state
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165 bool _markedForDeoptimization; // Used for stack deoptimization
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166 enum { alive = 0,
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167 not_entrant = 1, // uncommon trap has happend but activations may still exist
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168 zombie = 2,
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169 unloaded = 3 };
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170
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171 // used by jvmti to track if an unload event has been posted for this nmethod.
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172 bool _unload_reported;
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173
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174 NOT_PRODUCT(bool _has_debug_info; )
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175
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176 // Nmethod Flushing lock (if non-zero, then the nmethod is not removed)
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177 jint _lock_count;
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178
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179 // not_entrant method removal. Each mark_sweep pass will update
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180 // this mark to current sweep invocation count if it is seen on the
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181 // stack. An not_entrant method can be removed when there is no
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182 // more activations, i.e., when the _stack_traversal_mark is less than
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183 // current sweep traversal index.
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184 long _stack_traversal_mark;
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185
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186 ExceptionCache *_exception_cache;
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187 PcDescCache _pc_desc_cache;
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188
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189 // These are only used for compiled synchronized native methods to
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190 // locate the owner and stack slot for the BasicLock so that we can
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191 // properly revoke the bias of the owner if necessary. They are
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192 // needed because there is no debug information for compiled native
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193 // wrappers and the oop maps are insufficient to allow
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194 // frame::retrieve_receiver() to work. Currently they are expected
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195 // to be byte offsets from the Java stack pointer for maximum code
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196 // sharing between platforms. Note that currently biased locking
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197 // will never cause Class instances to be biased but this code
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198 // handles the static synchronized case as well.
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199 ByteSize _compiled_synchronized_native_basic_lock_owner_sp_offset;
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200 ByteSize _compiled_synchronized_native_basic_lock_sp_offset;
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201
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202 friend class nmethodLocker;
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203
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204 // For native wrappers
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205 nmethod(methodOop method,
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206 int nmethod_size,
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207 CodeOffsets* offsets,
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208 CodeBuffer *code_buffer,
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209 int frame_size,
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210 ByteSize basic_lock_owner_sp_offset, /* synchronized natives only */
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211 ByteSize basic_lock_sp_offset, /* synchronized natives only */
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212 OopMapSet* oop_maps);
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213
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214 // Creation support
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215 nmethod(methodOop method,
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216 int nmethod_size,
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217 int compile_id,
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218 int entry_bci,
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219 CodeOffsets* offsets,
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220 int orig_pc_offset,
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221 DebugInformationRecorder *recorder,
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222 Dependencies* dependencies,
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223 CodeBuffer *code_buffer,
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224 int frame_size,
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225 OopMapSet* oop_maps,
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226 ExceptionHandlerTable* handler_table,
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227 ImplicitExceptionTable* nul_chk_table,
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228 AbstractCompiler* compiler,
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229 int comp_level);
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230
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231 // helper methods
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232 void* operator new(size_t size, int nmethod_size);
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233 void check_store();
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234
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235 const char* reloc_string_for(u_char* begin, u_char* end);
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236 void make_not_entrant_or_zombie(int state);
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237 void inc_decompile_count();
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238
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239 // used to check that writes to nmFlags are done consistently.
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240 static void check_safepoint() PRODUCT_RETURN;
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241
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242 // Used to manipulate the exception cache
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243 void add_exception_cache_entry(ExceptionCache* new_entry);
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244 ExceptionCache* exception_cache_entry_for_exception(Handle exception);
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245
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246 // Inform external interfaces that a compiled method has been unloaded
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247 inline void post_compiled_method_unload();
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248
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249 public:
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250 // create nmethod with entry_bci
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251 static nmethod* new_nmethod(methodHandle method,
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252 int compile_id,
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253 int entry_bci,
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254 CodeOffsets* offsets,
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255 int orig_pc_offset,
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256 DebugInformationRecorder* recorder,
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257 Dependencies* dependencies,
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258 CodeBuffer *code_buffer,
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259 int frame_size,
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260 OopMapSet* oop_maps,
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261 ExceptionHandlerTable* handler_table,
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262 ImplicitExceptionTable* nul_chk_table,
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263 AbstractCompiler* compiler,
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264 int comp_level);
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265
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266 static nmethod* new_native_nmethod(methodHandle method,
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267 CodeBuffer *code_buffer,
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268 int vep_offset,
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269 int frame_complete,
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270 int frame_size,
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271 ByteSize receiver_sp_offset,
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272 ByteSize basic_lock_sp_offset,
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273 OopMapSet* oop_maps);
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274
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275 // accessors
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276 methodOop method() const { return _method; }
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277 AbstractCompiler* compiler() const { return _compiler; }
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278
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279 #ifndef PRODUCT
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280 bool has_debug_info() const { return _has_debug_info; }
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281 void set_has_debug_info(bool f) { _has_debug_info = false; }
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282 #endif // NOT PRODUCT
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283
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284 // type info
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285 bool is_nmethod() const { return true; }
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286 bool is_java_method() const { return !method()->is_native(); }
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287 bool is_native_method() const { return method()->is_native(); }
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288 bool is_osr_method() const { return _entry_bci != InvocationEntryBci; }
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289 bool is_osr_only_method() const { return is_osr_method(); }
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290
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291 bool is_compiled_by_c1() const;
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292 bool is_compiled_by_c2() const;
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293
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294 // boundaries for different parts
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295 address code_begin () const { return _entry_point; }
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296 address code_end () const { return header_begin() + _stub_offset ; }
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297 address exception_begin () const { return header_begin() + _exception_offset ; }
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298 address deopt_handler_begin() const { return header_begin() + _deoptimize_offset ; }
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299 address stub_begin () const { return header_begin() + _stub_offset ; }
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300 address stub_end () const { return header_begin() + _consts_offset ; }
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301 address consts_begin () const { return header_begin() + _consts_offset ; }
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302 address consts_end () const { return header_begin() + _scopes_data_offset ; }
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303 address scopes_data_begin () const { return header_begin() + _scopes_data_offset ; }
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304 address scopes_data_end () const { return header_begin() + _scopes_pcs_offset ; }
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305 PcDesc* scopes_pcs_begin () const { return (PcDesc*)(header_begin() + _scopes_pcs_offset ); }
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306 PcDesc* scopes_pcs_end () const { return (PcDesc*)(header_begin() + _dependencies_offset); }
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307 address dependencies_begin () const { return header_begin() + _dependencies_offset ; }
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308 address dependencies_end () const { return header_begin() + _handler_table_offset ; }
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309 address handler_table_begin() const { return header_begin() + _handler_table_offset ; }
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310 address handler_table_end () const { return header_begin() + _nul_chk_table_offset ; }
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311 address nul_chk_table_begin() const { return header_begin() + _nul_chk_table_offset ; }
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312 address nul_chk_table_end () const { return header_begin() + _nmethod_end_offset ; }
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313
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314 int code_size () const { return code_end () - code_begin (); }
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315 int stub_size () const { return stub_end () - stub_begin (); }
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316 int consts_size () const { return consts_end () - consts_begin (); }
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317 int scopes_data_size () const { return scopes_data_end () - scopes_data_begin (); }
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318 int scopes_pcs_size () const { return (intptr_t)scopes_pcs_end () - (intptr_t)scopes_pcs_begin (); }
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319 int dependencies_size () const { return dependencies_end () - dependencies_begin (); }
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320 int handler_table_size() const { return handler_table_end() - handler_table_begin(); }
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321 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); }
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322
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323 int total_size () const;
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324
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325 bool code_contains (address addr) const { return code_begin () <= addr && addr < code_end (); }
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326 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); }
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327 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); }
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328 bool scopes_data_contains (address addr) const { return scopes_data_begin () <= addr && addr < scopes_data_end (); }
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329 bool scopes_pcs_contains (PcDesc* addr) const { return scopes_pcs_begin () <= addr && addr < scopes_pcs_end (); }
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330 bool handler_table_contains(address addr) const { return handler_table_begin() <= addr && addr < handler_table_end(); }
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331 bool nul_chk_table_contains(address addr) const { return nul_chk_table_begin() <= addr && addr < nul_chk_table_end(); }
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332
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333 // entry points
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334 address entry_point() const { return _entry_point; } // normal entry point
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335 address verified_entry_point() const { return _verified_entry_point; } // if klass is correct
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336
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337 // flag accessing and manipulation
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338 bool is_in_use() const { return flags.state == alive; }
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339 bool is_alive() const { return flags.state == alive || flags.state == not_entrant; }
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340 bool is_not_entrant() const { return flags.state == not_entrant; }
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341 bool is_zombie() const { return flags.state == zombie; }
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342 bool is_unloaded() const { return flags.state == unloaded; }
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343
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344 // Make the nmethod non entrant. The nmethod will continue to be alive.
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345 // It is used when an uncommon trap happens.
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346 void make_not_entrant() { make_not_entrant_or_zombie(not_entrant); }
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347 void make_zombie() { make_not_entrant_or_zombie(zombie); }
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348
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349 // used by jvmti to track if the unload event has been reported
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350 bool unload_reported() { return _unload_reported; }
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351 void set_unload_reported() { _unload_reported = true; }
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352
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353 bool is_marked_for_deoptimization() const { return _markedForDeoptimization; }
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354 void mark_for_deoptimization() { _markedForDeoptimization = true; }
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355
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356 void make_unloaded(BoolObjectClosure* is_alive, oop cause);
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357
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358 bool has_dependencies() { return dependencies_size() != 0; }
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359 void flush_dependencies(BoolObjectClosure* is_alive);
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360 bool has_flushed_dependencies() { return flags.hasFlushedDependencies; }
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361 void set_has_flushed_dependencies() {
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362 check_safepoint();
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363 assert(!has_flushed_dependencies(), "should only happen once");
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364 flags.hasFlushedDependencies = 1;
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365 }
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366
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367 bool is_marked_for_reclamation() const { return flags.markedForReclamation; }
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368 void mark_for_reclamation() { check_safepoint(); flags.markedForReclamation = 1; }
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369 void unmark_for_reclamation() { check_safepoint(); flags.markedForReclamation = 0; }
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370
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371 bool has_unsafe_access() const { return flags.has_unsafe_access; }
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372 void set_has_unsafe_access(bool z) { flags.has_unsafe_access = z; }
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373
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374 int level() const { return flags.level; }
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375 void set_level(int newLevel) { check_safepoint(); flags.level = newLevel; }
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376
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377 int comp_level() const { return _comp_level; }
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378
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379 int version() const { return flags.version; }
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380 void set_version(int v);
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381
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382 // Sweeper support
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383 long stack_traversal_mark() { return _stack_traversal_mark; }
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384 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; }
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385
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386 // Exception cache support
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387 ExceptionCache* exception_cache() const { return _exception_cache; }
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388 void set_exception_cache(ExceptionCache *ec) { _exception_cache = ec; }
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389 address handler_for_exception_and_pc(Handle exception, address pc);
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390 void add_handler_for_exception_and_pc(Handle exception, address pc, address handler);
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391 void remove_from_exception_cache(ExceptionCache* ec);
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392
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393 // implicit exceptions support
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394 address continuation_for_implicit_exception(address pc);
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395
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396 // On-stack replacement support
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397 int osr_entry_bci() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _entry_bci; }
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398 address osr_entry() const { assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); return _osr_entry_point; }
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399 void invalidate_osr_method();
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400 nmethod* link() const { return _link; }
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401 void set_link(nmethod *n) { _link = n; }
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402
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403 // tells whether frames described by this nmethod can be deoptimized
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404 // note: native wrappers cannot be deoptimized.
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405 bool can_be_deoptimized() const { return is_java_method(); }
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406
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407 // Inline cache support
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408 void clear_inline_caches();
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409 void cleanup_inline_caches();
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410 bool inlinecache_check_contains(address addr) const {
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411 return (addr >= instructions_begin() && addr < verified_entry_point());
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412 }
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413
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414 // unlink and deallocate this nmethod
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415 // Only NMethodSweeper class is expected to use this. NMethodSweeper is not
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416 // expected to use any other private methods/data in this class.
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417
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418 protected:
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419 void flush();
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420
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421 public:
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422 // If returning true, it is unsafe to remove this nmethod even though it is a zombie
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423 // nmethod, since the VM might have a reference to it. Should only be called from a safepoint.
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424 bool is_locked_by_vm() const { return _lock_count >0; }
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425
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426 // See comment at definition of _last_seen_on_stack
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427 void mark_as_seen_on_stack();
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428 bool can_not_entrant_be_converted();
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429
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430 // Evolution support. We make old (discarded) compiled methods point to new methodOops.
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431 void set_method(methodOop method) { _method = method; }
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432
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433 // GC support
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434 void do_unloading(BoolObjectClosure* is_alive, OopClosure* keep_alive,
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435 bool unloading_occurred);
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436 bool can_unload(BoolObjectClosure* is_alive, OopClosure* keep_alive,
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437 oop* root, bool unloading_occurred);
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438
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439 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map,
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440 OopClosure* f);
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441 void oops_do(OopClosure* f);
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442
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443 // ScopeDesc for an instruction
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444 ScopeDesc* scope_desc_at(address pc);
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445
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446 private:
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447 ScopeDesc* scope_desc_in(address begin, address end);
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448
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449 address* orig_pc_addr(const frame* fr ) { return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); }
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450
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451 PcDesc* find_pc_desc_internal(address pc, bool approximate);
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452
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453 PcDesc* find_pc_desc(address pc, bool approximate) {
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454 PcDesc* desc = _pc_desc_cache.last_pc_desc();
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455 if (desc != NULL && desc->pc_offset() == pc - instructions_begin()) {
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456 return desc;
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457 }
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458 return find_pc_desc_internal(pc, approximate);
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459 }
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460
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461 public:
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462 // ScopeDesc retrieval operation
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463 PcDesc* pc_desc_at(address pc) { return find_pc_desc(pc, false); }
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464 // pc_desc_near returns the first PcDesc at or after the givne pc.
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465 PcDesc* pc_desc_near(address pc) { return find_pc_desc(pc, true); }
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466
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467 public:
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468 // copying of debugging information
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469 void copy_scopes_pcs(PcDesc* pcs, int count);
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470 void copy_scopes_data(address buffer, int size);
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471
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472 // deopt
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473 // return true is the pc is one would expect if the frame is being deopted.
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474 bool is_deopt_pc(address pc);
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475 // Accessor/mutator for the original pc of a frame before a frame was deopted.
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476 address get_original_pc(const frame* fr) { return *orig_pc_addr(fr); }
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477 void set_original_pc(const frame* fr, address pc) { *orig_pc_addr(fr) = pc; }
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478
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479 // jvmti support:
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480 void post_compiled_method_load_event();
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481
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482 // verify operations
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483 void verify();
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484 void verify_scopes();
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485 void verify_interrupt_point(address interrupt_point);
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486
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487 // printing support
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488 void print() const PRODUCT_RETURN;
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489 void print_code() PRODUCT_RETURN;
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490 void print_relocations() PRODUCT_RETURN;
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491 void print_pcs() PRODUCT_RETURN;
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492 void print_scopes() PRODUCT_RETURN;
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493 void print_dependencies() PRODUCT_RETURN;
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494 void print_value_on(outputStream* st) const PRODUCT_RETURN;
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495 void print_calls(outputStream* st) PRODUCT_RETURN;
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496 void print_handler_table() PRODUCT_RETURN;
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497 void print_nul_chk_table() PRODUCT_RETURN;
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498 void print_nmethod(bool print_code) PRODUCT_RETURN;
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499
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500 void print_on(outputStream* st, const char* title) const;
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501
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502 // Logging
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503 void log_identity(xmlStream* log) const;
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504 void log_new_nmethod() const;
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505 void log_state_change(int state) const;
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506
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507 // Prints a comment for one native instruction (reloc info, pc desc)
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508 void print_code_comment_on(outputStream* st, int column, address begin, address end) PRODUCT_RETURN;
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509 static void print_statistics() PRODUCT_RETURN;
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510
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511 // Compiler task identification. Note that all OSR methods
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512 // are numbered in an independent sequence if CICountOSR is true,
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513 // and native method wrappers are also numbered independently if
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514 // CICountNative is true.
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515 int compile_id() const { return _compile_id; }
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516 const char* compile_kind() const;
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517
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518 // For debugging
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519 // CompiledIC* IC_at(char* p) const;
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520 // PrimitiveIC* primitiveIC_at(char* p) const;
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521 oop embeddedOop_at(address p);
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522
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523 // tells if any of this method's dependencies have been invalidated
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524 // (this is expensive!)
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525 bool check_all_dependencies();
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526
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527 // tells if this compiled method is dependent on the given changes,
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528 // and the changes have invalidated it
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529 bool check_dependency_on(DepChange& changes);
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530
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531 // Evolution support. Tells if this compiled method is dependent on any of
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532 // methods m() of class dependee, such that if m() in dependee is replaced,
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533 // this compiled method will have to be deoptimized.
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534 bool is_evol_dependent_on(klassOop dependee);
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535
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536 // Fast breakpoint support. Tells if this compiled method is
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537 // dependent on the given method. Returns true if this nmethod
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538 // corresponds to the given method as well.
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539 bool is_dependent_on_method(methodOop dependee);
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540
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541 // is it ok to patch at address?
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542 bool is_patchable_at(address instr_address);
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543
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544 // UseBiasedLocking support
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545 ByteSize compiled_synchronized_native_basic_lock_owner_sp_offset() {
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546 return _compiled_synchronized_native_basic_lock_owner_sp_offset;
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547 }
|
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548 ByteSize compiled_synchronized_native_basic_lock_sp_offset() {
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549 return _compiled_synchronized_native_basic_lock_sp_offset;
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550 }
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551
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552 // support for code generation
|
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553 static int verified_entry_point_offset() { return offset_of(nmethod, _verified_entry_point); }
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554 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); }
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555 static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); }
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556
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557 };
|
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558
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559 // Locks an nmethod so its code will not get removed, even if it is a zombie/not_entrant method
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560 class nmethodLocker : public StackObj {
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561 nmethod* _nm;
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562
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563 static void lock_nmethod(nmethod* nm); // note: nm can be NULL
|
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564 static void unlock_nmethod(nmethod* nm); // (ditto)
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565
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566 public:
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567 nmethodLocker(address pc); // derive nm from pc
|
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568 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); }
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569 nmethodLocker() { _nm = NULL; }
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570 ~nmethodLocker() { unlock_nmethod(_nm); }
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571
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572 nmethod* code() { return _nm; }
|
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573 void set_code(nmethod* new_nm) {
|
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574 unlock_nmethod(_nm); // note: This works even if _nm==new_nm.
|
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575 _nm = new_nm;
|
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576 lock_nmethod(_nm);
|
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577 }
|
|
578 };
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