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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 // A frame represents a physical stack frame (an activation). Frames can be
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26 // C or Java frames, and the Java frames can be interpreted or compiled.
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27 // In contrast, vframes represent source-level activations, so that one physical frame
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28 // can correspond to multiple source level frames because of inlining.
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29 // A frame is comprised of {pc, fp, sp}
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30 // ------------------------------ Asm interpreter ----------------------------------------
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31 // Layout of asm interpreter frame:
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32 // [expression stack ] * <- sp
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33 // [monitors ] \
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34 // ... | monitor block size
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35 // [monitors ] /
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36 // [monitor block size ]
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37 // [byte code index/pointr] = bcx() bcx_offset
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38 // [pointer to locals ] = locals() locals_offset
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39 // [constant pool cache ] = cache() cache_offset
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40 // [methodData ] = mdp() mdx_offset
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41 // [methodOop ] = method() method_offset
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42 // [last sp ] = last_sp() last_sp_offset
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43 // [old stack pointer ] (sender_sp) sender_sp_offset
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44 // [old frame pointer ] <- fp = link()
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45 // [return pc ]
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46 // [oop temp ] (only for native calls)
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47 // [locals and parameters ]
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48 // <- sender sp
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49 // ------------------------------ Asm interpreter ----------------------------------------
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50
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51 // ------------------------------ C++ interpreter ----------------------------------------
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52 //
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53 // Layout of C++ interpreter frame: (While executing in BytecodeInterpreter::run)
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54 //
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55 // <- SP (current esp/rsp)
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56 // [local variables ] BytecodeInterpreter::run local variables
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57 // ... BytecodeInterpreter::run local variables
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58 // [local variables ] BytecodeInterpreter::run local variables
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59 // [old frame pointer ] fp [ BytecodeInterpreter::run's ebp/rbp ]
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60 // [return pc ] (return to frame manager)
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61 // [interpreter_state* ] (arg to BytecodeInterpreter::run) --------------
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62 // [expression stack ] <- last_Java_sp |
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63 // [... ] * <- interpreter_state.stack |
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64 // [expression stack ] * <- interpreter_state.stack_base |
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65 // [monitors ] \ |
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66 // ... | monitor block size |
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67 // [monitors ] / <- interpreter_state.monitor_base |
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68 // [struct interpretState ] <-----------------------------------------|
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69 // [return pc ] (return to callee of frame manager [1]
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70 // [locals and parameters ]
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71 // <- sender sp
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72
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73 // [1] When the c++ interpreter calls a new method it returns to the frame
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74 // manager which allocates a new frame on the stack. In that case there
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75 // is no real callee of this newly allocated frame. The frame manager is
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76 // aware of the additional frame(s) and will pop them as nested calls
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77 // complete. Howevers tTo make it look good in the debugger the frame
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78 // manager actually installs a dummy pc pointing to RecursiveInterpreterActivation
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79 // with a fake interpreter_state* parameter to make it easy to debug
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80 // nested calls.
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81
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82 // Note that contrary to the layout for the assembly interpreter the
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83 // expression stack allocated for the C++ interpreter is full sized.
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84 // However this is not as bad as it seems as the interpreter frame_manager
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85 // will truncate the unused space on succesive method calls.
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86 //
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87 // ------------------------------ C++ interpreter ----------------------------------------
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88
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89 public:
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90 enum {
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91 pc_return_offset = 0,
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92 // All frames
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93 link_offset = 0,
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94 return_addr_offset = 1,
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95 // non-interpreter frames
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96 sender_sp_offset = 2,
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97
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98 #ifndef CC_INTERP
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99
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100 // Interpreter frames
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101 interpreter_frame_result_handler_offset = 3, // for native calls only
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102 interpreter_frame_oop_temp_offset = 2, // for native calls only
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103
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104 interpreter_frame_sender_sp_offset = -1,
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105 // outgoing sp before a call to an invoked method
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106 interpreter_frame_last_sp_offset = interpreter_frame_sender_sp_offset - 1,
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107 interpreter_frame_method_offset = interpreter_frame_last_sp_offset - 1,
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108 interpreter_frame_mdx_offset = interpreter_frame_method_offset - 1,
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109 interpreter_frame_cache_offset = interpreter_frame_mdx_offset - 1,
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110 interpreter_frame_locals_offset = interpreter_frame_cache_offset - 1,
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111 interpreter_frame_bcx_offset = interpreter_frame_locals_offset - 1,
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112 interpreter_frame_initial_sp_offset = interpreter_frame_bcx_offset - 1,
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113
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114 interpreter_frame_monitor_block_top_offset = interpreter_frame_initial_sp_offset,
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115 interpreter_frame_monitor_block_bottom_offset = interpreter_frame_initial_sp_offset,
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116
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117 #endif // CC_INTERP
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118
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119 // Entry frames
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120 #ifdef AMD64
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121 #ifdef _WIN64
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122 entry_frame_after_call_words = 8,
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123 entry_frame_call_wrapper_offset = 2,
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124
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125 arg_reg_save_area_bytes = 32, // Register argument save area
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126 #else
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127 entry_frame_after_call_words = 13,
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128 entry_frame_call_wrapper_offset = -6,
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129
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130 arg_reg_save_area_bytes = 0,
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131 #endif // _WIN64
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132 #else
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133 entry_frame_call_wrapper_offset = 2,
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134 #endif // AMD64
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135
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136 // Native frames
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137
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138 native_frame_initial_param_offset = 2
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139
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140 };
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141
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142 intptr_t ptr_at(int offset) const {
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143 return *ptr_at_addr(offset);
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144 }
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145
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146 void ptr_at_put(int offset, intptr_t value) {
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147 *ptr_at_addr(offset) = value;
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148 }
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149
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150 private:
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151 // an additional field beyond _sp and _pc:
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152 intptr_t* _fp; // frame pointer
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153 // The interpreter and adapters will extend the frame of the caller.
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154 // Since oopMaps are based on the sp of the caller before extension
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155 // we need to know that value. However in order to compute the address
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156 // of the return address we need the real "raw" sp. Since sparc already
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157 // uses sp() to mean "raw" sp and unextended_sp() to mean the caller's
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158 // original sp we use that convention.
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159
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160 intptr_t* _unextended_sp;
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161
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162 intptr_t* ptr_at_addr(int offset) const {
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163 return (intptr_t*) addr_at(offset);
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164 }
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165
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166 public:
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167 // Constructors
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168
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169 frame(intptr_t* sp, intptr_t* fp, address pc);
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170
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171 frame(intptr_t* sp, intptr_t* unextended_sp, intptr_t* fp, address pc);
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172
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173 frame(intptr_t* sp, intptr_t* fp);
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174
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175 // accessors for the instance variables
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176 intptr_t* fp() const { return _fp; }
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177
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178 inline address* sender_pc_addr() const;
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179
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180 // return address of param, zero origin index.
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181 inline address* native_param_addr(int idx) const;
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182
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183 // expression stack tos if we are nested in a java call
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184 intptr_t* interpreter_frame_last_sp() const;
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185
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186 #ifndef CC_INTERP
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187 // deoptimization support
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188 void interpreter_frame_set_last_sp(intptr_t* sp);
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189 #endif // CC_INTERP
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190
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191 #ifdef CC_INTERP
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192 inline interpreterState get_interpreterState() const;
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193 #endif // CC_INTERP
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