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 # include "incls/_precompiled.incl"
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26 # include "incls/_frame_x86.cpp.incl"
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27
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28 #ifdef ASSERT
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29 void RegisterMap::check_location_valid() {
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30 }
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31 #endif
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32
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33
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34 // Profiling/safepoint support
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35
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36 bool frame::safe_for_sender(JavaThread *thread) {
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37 address sp = (address)_sp;
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38 address fp = (address)_fp;
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39 address unextended_sp = (address)_unextended_sp;
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40 bool sp_safe = (sp != NULL &&
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41 (sp <= thread->stack_base()) &&
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42 (sp >= thread->stack_base() - thread->stack_size()));
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43 bool unextended_sp_safe = (unextended_sp != NULL &&
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44 (unextended_sp <= thread->stack_base()) &&
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45 (unextended_sp >= thread->stack_base() - thread->stack_size()));
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46 bool fp_safe = (fp != NULL &&
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47 (fp <= thread->stack_base()) &&
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48 (fp >= thread->stack_base() - thread->stack_size()));
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49 if (sp_safe && unextended_sp_safe && fp_safe) {
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50 // Unfortunately we can only check frame complete for runtime stubs and nmethod
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51 // other generic buffer blobs are more problematic so we just assume they are
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52 // ok. adapter blobs never have a frame complete and are never ok.
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53 if (_cb != NULL && !_cb->is_frame_complete_at(_pc)) {
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54 if (_cb->is_nmethod() || _cb->is_adapter_blob() || _cb->is_runtime_stub()) {
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55 return false;
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56 }
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57 }
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58 return true;
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59 }
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60 // Note: fp == NULL is not really a prerequisite for this to be safe to
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61 // walk for c2. However we've modified the code such that if we get
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62 // a failure with fp != NULL that we then try with FP == NULL.
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63 // This is basically to mimic what a last_frame would look like if
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64 // c2 had generated it.
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65 if (sp_safe && unextended_sp_safe && fp == NULL) {
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66 // frame must be complete if fp == NULL as fp == NULL is only sensible
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67 // if we are looking at a nmethod and frame complete assures us of that.
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68 if (_cb != NULL && _cb->is_frame_complete_at(_pc) && _cb->is_compiled_by_c2()) {
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69 return true;
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70 }
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71 }
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72 return false;
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73 }
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74
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75
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76 void frame::patch_pc(Thread* thread, address pc) {
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77 if (TracePcPatching) {
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78 tty->print_cr("patch_pc at address 0x%x [0x%x -> 0x%x] ", &((address *)sp())[-1], ((address *)sp())[-1], pc);
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79 }
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80 ((address *)sp())[-1] = pc;
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81 _cb = CodeCache::find_blob(pc);
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82 if (_cb != NULL && _cb->is_nmethod() && ((nmethod*)_cb)->is_deopt_pc(_pc)) {
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83 address orig = (((nmethod*)_cb)->get_original_pc(this));
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84 assert(orig == _pc, "expected original to be stored before patching");
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85 _deopt_state = is_deoptimized;
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86 // leave _pc as is
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87 } else {
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88 _deopt_state = not_deoptimized;
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89 _pc = pc;
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90 }
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91 }
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92
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93 bool frame::is_interpreted_frame() const {
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94 return Interpreter::contains(pc());
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95 }
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96
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97 int frame::frame_size() const {
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98 RegisterMap map(JavaThread::current(), false);
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99 frame sender = this->sender(&map);
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100 return sender.sp() - sp();
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101 }
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102
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103 intptr_t* frame::entry_frame_argument_at(int offset) const {
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104 // convert offset to index to deal with tsi
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105 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
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106 // Entry frame's arguments are always in relation to unextended_sp()
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107 return &unextended_sp()[index];
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108 }
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109
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110 // sender_sp
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111 #ifdef CC_INTERP
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112 intptr_t* frame::interpreter_frame_sender_sp() const {
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113 assert(is_interpreted_frame(), "interpreted frame expected");
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114 // QQQ why does this specialize method exist if frame::sender_sp() does same thing?
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115 // seems odd and if we always know interpreted vs. non then sender_sp() is really
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116 // doing too much work.
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117 return get_interpreterState()->sender_sp();
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118 }
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119
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120 // monitor elements
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121
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122 BasicObjectLock* frame::interpreter_frame_monitor_begin() const {
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123 return get_interpreterState()->monitor_base();
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124 }
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125
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126 BasicObjectLock* frame::interpreter_frame_monitor_end() const {
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127 return (BasicObjectLock*) get_interpreterState()->stack_base();
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128 }
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129
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130 #else // CC_INTERP
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131
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132 intptr_t* frame::interpreter_frame_sender_sp() const {
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133 assert(is_interpreted_frame(), "interpreted frame expected");
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134 return (intptr_t*) at(interpreter_frame_sender_sp_offset);
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135 }
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136
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137 void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) {
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138 assert(is_interpreted_frame(), "interpreted frame expected");
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139 ptr_at_put(interpreter_frame_sender_sp_offset, (intptr_t) sender_sp);
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140 }
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141
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142
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143 // monitor elements
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144
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145 BasicObjectLock* frame::interpreter_frame_monitor_begin() const {
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146 return (BasicObjectLock*) addr_at(interpreter_frame_monitor_block_bottom_offset);
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147 }
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148
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149 BasicObjectLock* frame::interpreter_frame_monitor_end() const {
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150 BasicObjectLock* result = (BasicObjectLock*) *addr_at(interpreter_frame_monitor_block_top_offset);
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151 // make sure the pointer points inside the frame
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152 assert((intptr_t) fp() > (intptr_t) result, "result must < than frame pointer");
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153 assert((intptr_t) sp() <= (intptr_t) result, "result must >= than stack pointer");
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154 return result;
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155 }
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156
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157 void frame::interpreter_frame_set_monitor_end(BasicObjectLock* value) {
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158 *((BasicObjectLock**)addr_at(interpreter_frame_monitor_block_top_offset)) = value;
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159 }
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160
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161 // Used by template based interpreter deoptimization
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162 void frame::interpreter_frame_set_last_sp(intptr_t* sp) {
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163 *((intptr_t**)addr_at(interpreter_frame_last_sp_offset)) = sp;
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164 }
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165 #endif // CC_INTERP
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166
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167 frame frame::sender_for_entry_frame(RegisterMap* map) const {
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168 assert(map != NULL, "map must be set");
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169 // Java frame called from C; skip all C frames and return top C
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170 // frame of that chunk as the sender
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171 JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor();
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172 assert(!entry_frame_is_first(), "next Java fp must be non zero");
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173 assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack");
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174 map->clear();
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175 assert(map->include_argument_oops(), "should be set by clear");
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176 if (jfa->last_Java_pc() != NULL ) {
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177 frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc());
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178 return fr;
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179 }
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180 frame fr(jfa->last_Java_sp(), jfa->last_Java_fp());
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181 return fr;
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182 }
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183
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184 frame frame::sender_for_interpreter_frame(RegisterMap* map) const {
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185 // sp is the raw sp from the sender after adapter or interpreter extension
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186 intptr_t* sp = (intptr_t*) addr_at(sender_sp_offset);
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187
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188 // This is the sp before any possible extension (adapter/locals).
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189 intptr_t* unextended_sp = interpreter_frame_sender_sp();
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190
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191 // The interpreter and compiler(s) always save EBP/RBP in a known
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192 // location on entry. We must record where that location is
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193 // so this if EBP/RBP was live on callout from c2 we can find
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194 // the saved copy no matter what it called.
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195
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196 // Since the interpreter always saves EBP/RBP if we record where it is then
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197 // we don't have to always save EBP/RBP on entry and exit to c2 compiled
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198 // code, on entry will be enough.
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199 #ifdef COMPILER2
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200 if (map->update_map()) {
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201 map->set_location(rbp->as_VMReg(), (address) addr_at(link_offset));
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202 #ifdef AMD64
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203 // this is weird "H" ought to be at a higher address however the
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204 // oopMaps seems to have the "H" regs at the same address and the
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205 // vanilla register.
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206 // XXXX make this go away
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207 if (true) {
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208 map->set_location(rbp->as_VMReg()->next(), (address)addr_at(link_offset));
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209 }
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210 #endif // AMD64
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211 }
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212 #endif /* COMPILER2 */
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213 return frame(sp, unextended_sp, link(), sender_pc());
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214 }
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215
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216
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217 //------------------------------sender_for_compiled_frame-----------------------
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218 frame frame::sender_for_compiled_frame(RegisterMap* map) const {
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219 assert(map != NULL, "map must be set");
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220 const bool c1_compiled = _cb->is_compiled_by_c1();
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221
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222 // frame owned by optimizing compiler
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223 intptr_t* sender_sp = NULL;
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224
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225 assert(_cb->frame_size() >= 0, "must have non-zero frame size");
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226 sender_sp = unextended_sp() + _cb->frame_size();
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227
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228 // On Intel the return_address is always the word on the stack
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229 address sender_pc = (address) *(sender_sp-1);
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230
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231 // This is the saved value of ebp which may or may not really be an fp.
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232 // it is only an fp if the sender is an interpreter frame (or c1?)
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233
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234 intptr_t *saved_fp = (intptr_t*)*(sender_sp - frame::sender_sp_offset);
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235
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236 if (map->update_map()) {
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237 // Tell GC to use argument oopmaps for some runtime stubs that need it.
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238 // For C1, the runtime stub might not have oop maps, so set this flag
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239 // outside of update_register_map.
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240 map->set_include_argument_oops(_cb->caller_must_gc_arguments(map->thread()));
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241 if (_cb->oop_maps() != NULL) {
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242 OopMapSet::update_register_map(this, map);
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243 }
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244 // Since the prolog does the save and restore of epb there is no oopmap
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245 // for it so we must fill in its location as if there was an oopmap entry
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246 // since if our caller was compiled code there could be live jvm state in it.
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247 map->set_location(rbp->as_VMReg(), (address) (sender_sp - frame::sender_sp_offset));
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248 #ifdef AMD64
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249 // this is weird "H" ought to be at a higher address however the
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250 // oopMaps seems to have the "H" regs at the same address and the
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251 // vanilla register.
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252 // XXXX make this go away
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253 if (true) {
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254 map->set_location(rbp->as_VMReg()->next(), (address) (sender_sp - frame::sender_sp_offset));
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255 }
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256 #endif // AMD64
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257 }
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258
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259 assert(sender_sp != sp(), "must have changed");
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260 return frame(sender_sp, saved_fp, sender_pc);
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261 }
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262
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263 frame frame::sender(RegisterMap* map) const {
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264 // Default is we done have to follow them. The sender_for_xxx will
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265 // update it accordingly
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266 map->set_include_argument_oops(false);
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267
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268 if (is_entry_frame()) return sender_for_entry_frame(map);
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269 if (is_interpreted_frame()) return sender_for_interpreter_frame(map);
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270 assert(_cb == CodeCache::find_blob(pc()),"Must be the same");
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271
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272 if (_cb != NULL) {
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273 return sender_for_compiled_frame(map);
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274 }
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275 // Must be native-compiled frame, i.e. the marshaling code for native
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276 // methods that exists in the core system.
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277 return frame(sender_sp(), link(), sender_pc());
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278 }
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279
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280
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281 bool frame::interpreter_frame_equals_unpacked_fp(intptr_t* fp) {
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282 assert(is_interpreted_frame(), "must be interpreter frame");
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283 methodOop method = interpreter_frame_method();
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284 // When unpacking an optimized frame the frame pointer is
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285 // adjusted with:
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286 int diff = (method->max_locals() - method->size_of_parameters()) *
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287 Interpreter::stackElementWords();
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288 return _fp == (fp - diff);
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289 }
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290
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291 void frame::pd_gc_epilog() {
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292 // nothing done here now
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293 }
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294
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295 bool frame::is_interpreted_frame_valid() const {
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296 // QQQ
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297 #ifdef CC_INTERP
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298 #else
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299 assert(is_interpreted_frame(), "Not an interpreted frame");
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300 // These are reasonable sanity checks
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301 if (fp() == 0 || (intptr_t(fp()) & (wordSize-1)) != 0) {
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302 return false;
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303 }
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304 if (sp() == 0 || (intptr_t(sp()) & (wordSize-1)) != 0) {
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305 return false;
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306 }
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307 if (fp() + interpreter_frame_initial_sp_offset < sp()) {
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308 return false;
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309 }
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310 // These are hacks to keep us out of trouble.
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311 // The problem with these is that they mask other problems
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312 if (fp() <= sp()) { // this attempts to deal with unsigned comparison above
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313 return false;
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314 }
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315 if (fp() - sp() > 4096) { // stack frames shouldn't be large.
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316 return false;
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317 }
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318 #endif // CC_INTERP
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319 return true;
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320 }
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321
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322 BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) {
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323 #ifdef CC_INTERP
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324 // Needed for JVMTI. The result should always be in the interpreterState object
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325 assert(false, "NYI");
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326 interpreterState istate = get_interpreterState();
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327 #endif // CC_INTERP
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328 assert(is_interpreted_frame(), "interpreted frame expected");
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329 methodOop method = interpreter_frame_method();
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330 BasicType type = method->result_type();
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331
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332 intptr_t* tos_addr;
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333 if (method->is_native()) {
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334 // Prior to calling into the runtime to report the method_exit the possible
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335 // return value is pushed to the native stack. If the result is a jfloat/jdouble
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336 // then ST0 is saved before EAX/EDX. See the note in generate_native_result
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337 tos_addr = (intptr_t*)sp();
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338 if (type == T_FLOAT || type == T_DOUBLE) {
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339 // QQQ seems like this code is equivalent on the two platforms
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340 #ifdef AMD64
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341 // This is times two because we do a push(ltos) after pushing XMM0
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342 // and that takes two interpreter stack slots.
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343 tos_addr += 2 * Interpreter::stackElementWords();
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344 #else
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345 tos_addr += 2;
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346 #endif // AMD64
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347 }
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348 } else {
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349 tos_addr = (intptr_t*)interpreter_frame_tos_address();
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350 }
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351
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352 switch (type) {
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353 case T_OBJECT :
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354 case T_ARRAY : {
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355 oop obj;
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356 if (method->is_native()) {
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357 #ifdef CC_INTERP
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358 obj = istate->_oop_temp;
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359 #else
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360 obj = (oop) at(interpreter_frame_oop_temp_offset);
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361 #endif // CC_INTERP
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362 } else {
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363 oop* obj_p = (oop*)tos_addr;
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364 obj = (obj_p == NULL) ? (oop)NULL : *obj_p;
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365 }
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366 assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check");
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367 *oop_result = obj;
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368 break;
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369 }
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370 case T_BOOLEAN : value_result->z = *(jboolean*)tos_addr; break;
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371 case T_BYTE : value_result->b = *(jbyte*)tos_addr; break;
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372 case T_CHAR : value_result->c = *(jchar*)tos_addr; break;
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373 case T_SHORT : value_result->s = *(jshort*)tos_addr; break;
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374 case T_INT : value_result->i = *(jint*)tos_addr; break;
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375 case T_LONG : value_result->j = *(jlong*)tos_addr; break;
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376 case T_FLOAT : {
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377 #ifdef AMD64
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378 value_result->f = *(jfloat*)tos_addr;
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379 #else
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380 if (method->is_native()) {
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381 jdouble d = *(jdouble*)tos_addr; // Result was in ST0 so need to convert to jfloat
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382 value_result->f = (jfloat)d;
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383 } else {
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384 value_result->f = *(jfloat*)tos_addr;
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385 }
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386 #endif // AMD64
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387 break;
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388 }
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389 case T_DOUBLE : value_result->d = *(jdouble*)tos_addr; break;
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390 case T_VOID : /* Nothing to do */ break;
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391 default : ShouldNotReachHere();
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392 }
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393
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394 return type;
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395 }
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396
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397
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398 intptr_t* frame::interpreter_frame_tos_at(jint offset) const {
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399 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
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400 return &interpreter_frame_tos_address()[index];
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401 }
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