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1 /*
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2 * Copyright 1997-2005 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 // The CompiledIC represents a compiled inline cache.
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27 //
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28 // In order to make patching of the inline cache MT-safe, we only allow the following
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29 // transitions (when not at a safepoint):
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30 //
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31 //
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32 // [1] --<-- Clean -->--- [1]
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33 // / (null) \
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34 // / \ /-<-\
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35 // / [2] \ / \
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36 // Interpreted ---------> Monomorphic | [3]
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37 // (compiledICHolderOop) (klassOop) |
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38 // \ / \ /
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39 // [4] \ / [4] \->-/
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40 // \->- Megamorphic -<-/
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41 // (methodOop)
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42 //
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43 // The text in paranteses () refere to the value of the inline cache receiver (mov instruction)
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44 //
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45 // The numbers in square brackets refere to the kind of transition:
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46 // [1]: Initial fixup. Receiver it found from debug information
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47 // [2]: Compilation of a method
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48 // [3]: Recompilation of a method (note: only entry is changed. The klassOop must stay the same)
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49 // [4]: Inline cache miss. We go directly to megamorphic call.
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50 //
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51 // The class automatically inserts transition stubs (using the InlineCacheBuffer) when an MT-unsafe
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52 // transition is made to a stub.
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53 //
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54 class CompiledIC;
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55
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56 class CompiledICInfo {
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57 friend class CompiledIC;
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58 private:
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59 address _entry; // entry point for call
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60 Handle _cached_oop; // Value of cached_oop (either in stub or inline cache)
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61 bool _is_optimized; // it is an optimized virtual call (i.e., can be statically bound)
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62 bool _to_interpreter; // Call it to interpreter
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63 public:
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64 address entry() const { return _entry; }
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65 Handle cached_oop() const { return _cached_oop; }
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66 bool is_optimized() const { return _is_optimized; }
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67 };
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68
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69 class CompiledIC: public ResourceObj {
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70 friend class InlineCacheBuffer;
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71 friend class ICStub;
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72
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73
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74 private:
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75 NativeCall* _ic_call; // the call instruction
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76 oop* _oop_addr; // patchable oop cell for this IC
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77 RelocIterator _oops; // iteration over any and all set-oop instructions
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78 bool _is_optimized; // an optimized virtual call (i.e., no compiled IC)
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79
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80 CompiledIC(NativeCall* ic_call);
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81 CompiledIC(Relocation* ic_reloc); // Must be of virtual_call_type/opt_virtual_call_type
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82
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83 // low-level inline-cache manipulation. Cannot be accessed directly, since it might not be MT-safe
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84 // to change an inline-cache. These changes the underlying inline-cache directly. They *newer* make
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85 // changes to a transition stub.
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86 void set_ic_destination(address entry_point);
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87 void set_cached_oop(oop cache);
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88
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89 // Reads the location of the transition stub. This will fail with an assertion, if no transition stub is
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90 // associated with the inline cache.
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91 address stub_address() const;
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92 bool is_in_transition_state() const; // Use InlineCacheBuffer
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93
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94 public:
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95 // conversion (machine PC to CompiledIC*)
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96 friend CompiledIC* CompiledIC_before(address return_addr);
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97 friend CompiledIC* CompiledIC_at(address call_site);
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98 friend CompiledIC* CompiledIC_at(Relocation* call_site);
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99
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100 // Return the cached_oop/destination associated with this inline cache. If the cache currently points
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101 // to a transition stub, it will read the values from the transition stub.
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102 oop cached_oop() const;
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103 address ic_destination() const;
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104
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105 bool is_optimized() const { return _is_optimized; }
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106
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107 // State
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108 bool is_clean() const;
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109 bool is_megamorphic() const;
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110 bool is_call_to_compiled() const;
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111 bool is_call_to_interpreted() const;
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112
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113 address end_of_call() { return _ic_call->return_address(); }
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114
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115 // MT-safe patching of inline caches. Note: Only safe to call is_xxx when holding the CompiledIC_ock
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116 // so you are guaranteed that no patching takes place. The same goes for verify.
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117 //
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118 // Note: We do not provide any direct access to the stub code, to prevent parts of the code
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119 // to manipulate the inline cache in MT-unsafe ways.
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120 //
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121 // They all takes a TRAP argument, since they can cause a GC if the inline-cache buffer is full.
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122 //
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123 void set_to_clean(); // Can only be called during a safepoint operation
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124 void set_to_monomorphic(const CompiledICInfo& info);
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125 void set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS);
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126
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127 static void compute_monomorphic_entry(methodHandle method, KlassHandle receiver_klass,
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128 bool is_optimized, bool static_bound, CompiledICInfo& info, TRAPS);
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129
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130 // Location
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131 address instruction_address() const { return _ic_call->instruction_address(); }
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132
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133 // Misc
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134 void print() PRODUCT_RETURN;
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135 void print_compiled_ic() PRODUCT_RETURN;
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136 void verify() PRODUCT_RETURN;
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137 };
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138
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139 inline CompiledIC* CompiledIC_before(address return_addr) {
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140 CompiledIC* c_ic = new CompiledIC(nativeCall_before(return_addr));
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141 c_ic->verify();
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142 return c_ic;
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143 }
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144
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145 inline CompiledIC* CompiledIC_at(address call_site) {
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146 CompiledIC* c_ic = new CompiledIC(nativeCall_at(call_site));
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147 c_ic->verify();
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148 return c_ic;
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149 }
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150
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151 inline CompiledIC* CompiledIC_at(Relocation* call_site) {
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152 CompiledIC* c_ic = new CompiledIC(call_site);
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153 c_ic->verify();
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154 return c_ic;
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155 }
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156
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157
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158 //-----------------------------------------------------------------------------
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159 // The CompiledStaticCall represents a call to a static method in the compiled
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160 //
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161 // Transition diagram of a static call site is somewhat simpler than for an inlined cache:
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162 //
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163 //
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164 // -----<----- Clean ----->-----
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165 // / \
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166 // / \
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167 // compilled code <------------> interpreted code
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168 //
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169 // Clean: Calls directly to runtime method for fixup
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170 // Compiled code: Calls directly to compiled code
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171 // Interpreted code: Calls to stub that set methodOop reference
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172 //
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173 //
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174 class CompiledStaticCall;
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175
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176 class StaticCallInfo {
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177 private:
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178 address _entry; // Entrypoint
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179 methodHandle _callee; // Callee (used when calling interpreter)
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180 bool _to_interpreter; // call to interpreted method (otherwise compiled)
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181
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182 friend class CompiledStaticCall;
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183 public:
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184 address entry() const { return _entry; }
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185 methodHandle callee() const { return _callee; }
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186 };
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187
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188
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189 class CompiledStaticCall: public NativeCall {
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190 friend class CompiledIC;
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191
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192 // Also used by CompiledIC
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193 void set_to_interpreted(methodHandle callee, address entry);
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194 bool is_optimized_virtual();
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195
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196 public:
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197 friend CompiledStaticCall* compiledStaticCall_before(address return_addr);
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198 friend CompiledStaticCall* compiledStaticCall_at(address native_call);
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199 friend CompiledStaticCall* compiledStaticCall_at(Relocation* call_site);
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200
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201 // State
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202 bool is_clean() const;
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203 bool is_call_to_compiled() const;
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204 bool is_call_to_interpreted() const;
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205
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206 // Clean static call (will force resolving on next use)
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207 void set_to_clean();
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208
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209 // Set state. The entry must be the same, as computed by compute_entry.
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210 // Computation and setting is split up, since the actions are separate during
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211 // a OptoRuntime::resolve_xxx.
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212 void set(const StaticCallInfo& info);
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213
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214 // Compute entry point given a method
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215 static void compute_entry(methodHandle m, StaticCallInfo& info);
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216
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217 // Stub support
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218 address find_stub();
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219 static void set_stub_to_clean(static_stub_Relocation* static_stub);
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220
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221 // Misc.
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222 void print() PRODUCT_RETURN;
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223 void verify() PRODUCT_RETURN;
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224 };
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225
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226
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227 inline CompiledStaticCall* compiledStaticCall_before(address return_addr) {
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228 CompiledStaticCall* st = (CompiledStaticCall*)nativeCall_before(return_addr);
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229 st->verify();
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230 return st;
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231 }
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232
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233 inline CompiledStaticCall* compiledStaticCall_at(address native_call) {
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234 CompiledStaticCall* st = (CompiledStaticCall*)native_call;
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235 st->verify();
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236 return st;
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237 }
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238
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239 inline CompiledStaticCall* compiledStaticCall_at(Relocation* call_site) {
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240 return compiledStaticCall_at(call_site->addr());
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241 }
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