Mercurial > hg > truffle
annotate src/cpu/x86/vm/frame_x86.cpp @ 1942:00bc9eaf0e24
Support for -XX:+UseFastLocking flag. Fixed monitor enter XIR template for correct debug info at the runtime call.
| author | Thomas Wuerthinger <wuerthinger@ssw.jku.at> |
|---|---|
| date | Wed, 29 Dec 2010 20:06:41 +0100 |
| parents | 1aa5b22a7716 |
| children | 06f017f7daa7 |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
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2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_frame_x86.cpp.incl" | |
| 27 | |
| 28 #ifdef ASSERT | |
| 29 void RegisterMap::check_location_valid() { | |
| 30 } | |
| 31 #endif | |
| 32 | |
| 33 | |
| 34 // Profiling/safepoint support | |
| 35 | |
| 36 bool frame::safe_for_sender(JavaThread *thread) { | |
| 37 address sp = (address)_sp; | |
| 38 address fp = (address)_fp; | |
| 39 address unextended_sp = (address)_unextended_sp; | |
|
107
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40 // sp must be within the stack |
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41 bool sp_safe = (sp <= thread->stack_base()) && |
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42 (sp >= thread->stack_base() - thread->stack_size()); |
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43 |
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44 if (!sp_safe) { |
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45 return false; |
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46 } |
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47 |
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48 // unextended sp must be within the stack and above or equal sp |
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49 bool unextended_sp_safe = (unextended_sp <= thread->stack_base()) && |
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50 (unextended_sp >= sp); |
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51 |
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52 if (!unextended_sp_safe) { |
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53 return false; |
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54 } |
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55 |
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56 // an fp must be within the stack and above (but not equal) sp |
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57 bool fp_safe = (fp <= thread->stack_base()) && (fp > sp); |
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58 |
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59 // We know sp/unextended_sp are safe only fp is questionable here |
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60 |
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61 // If the current frame is known to the code cache then we can attempt to |
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62 // to construct the sender and do some validation of it. This goes a long way |
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63 // toward eliminating issues when we get in frame construction code |
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64 |
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65 if (_cb != NULL ) { |
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66 |
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67 // First check if frame is complete and tester is reliable |
| 0 | 68 // Unfortunately we can only check frame complete for runtime stubs and nmethod |
| 69 // other generic buffer blobs are more problematic so we just assume they are | |
| 70 // ok. adapter blobs never have a frame complete and are never ok. | |
|
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71 |
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72 if (!_cb->is_frame_complete_at(_pc)) { |
| 0 | 73 if (_cb->is_nmethod() || _cb->is_adapter_blob() || _cb->is_runtime_stub()) { |
| 74 return false; | |
| 75 } | |
| 76 } | |
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77 // Entry frame checks |
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78 if (is_entry_frame()) { |
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79 // an entry frame must have a valid fp. |
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80 |
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81 if (!fp_safe) return false; |
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82 |
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83 // Validate the JavaCallWrapper an entry frame must have |
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84 |
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85 address jcw = (address)entry_frame_call_wrapper(); |
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86 |
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87 bool jcw_safe = (jcw <= thread->stack_base()) && ( jcw > fp); |
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88 |
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89 return jcw_safe; |
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90 |
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91 } |
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92 |
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93 intptr_t* sender_sp = NULL; |
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94 address sender_pc = NULL; |
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95 |
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96 if (is_interpreted_frame()) { |
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97 // fp must be safe |
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98 if (!fp_safe) { |
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99 return false; |
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100 } |
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101 |
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102 sender_pc = (address) this->fp()[return_addr_offset]; |
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103 sender_sp = (intptr_t*) addr_at(sender_sp_offset); |
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104 |
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105 } else { |
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106 // must be some sort of compiled/runtime frame |
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107 // fp does not have to be safe (although it could be check for c1?) |
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108 |
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109 sender_sp = _unextended_sp + _cb->frame_size(); |
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110 // On Intel the return_address is always the word on the stack |
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111 sender_pc = (address) *(sender_sp-1); |
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112 } |
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113 |
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114 // We must always be able to find a recognizable pc |
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115 CodeBlob* sender_blob = CodeCache::find_blob_unsafe(sender_pc); |
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116 if (sender_pc == NULL || sender_blob == NULL) { |
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117 return false; |
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118 } |
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119 |
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120 |
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121 // If the potential sender is the interpreter then we can do some more checking |
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122 if (Interpreter::contains(sender_pc)) { |
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123 |
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124 // ebp is always saved in a recognizable place in any code we generate. However |
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125 // only if the sender is interpreted/call_stub (c1 too?) are we certain that the saved ebp |
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126 // is really a frame pointer. |
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127 |
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128 intptr_t *saved_fp = (intptr_t*)*(sender_sp - frame::sender_sp_offset); |
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129 bool saved_fp_safe = ((address)saved_fp <= thread->stack_base()) && (saved_fp > sender_sp); |
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130 |
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131 if (!saved_fp_safe) { |
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132 return false; |
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133 } |
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134 |
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135 // construct the potential sender |
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136 |
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137 frame sender(sender_sp, saved_fp, sender_pc); |
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138 |
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139 return sender.is_interpreted_frame_valid(thread); |
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140 |
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141 } |
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142 |
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143 // Could just be some random pointer within the codeBlob |
| 1748 | 144 if (!sender_blob->code_contains(sender_pc)) { |
| 145 return false; | |
| 146 } | |
|
107
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147 |
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148 // We should never be able to see an adapter if the current frame is something from code cache |
| 1748 | 149 if (sender_blob->is_adapter_blob()) { |
|
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150 return false; |
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151 } |
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152 |
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153 // Could be the call_stub |
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154 |
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155 if (StubRoutines::returns_to_call_stub(sender_pc)) { |
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156 intptr_t *saved_fp = (intptr_t*)*(sender_sp - frame::sender_sp_offset); |
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157 bool saved_fp_safe = ((address)saved_fp <= thread->stack_base()) && (saved_fp > sender_sp); |
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158 |
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159 if (!saved_fp_safe) { |
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160 return false; |
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161 } |
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162 |
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163 // construct the potential sender |
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164 |
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165 frame sender(sender_sp, saved_fp, sender_pc); |
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166 |
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167 // Validate the JavaCallWrapper an entry frame must have |
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168 address jcw = (address)sender.entry_frame_call_wrapper(); |
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169 |
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170 bool jcw_safe = (jcw <= thread->stack_base()) && ( jcw > (address)sender.fp()); |
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171 |
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172 return jcw_safe; |
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173 } |
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174 |
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175 // If the frame size is 0 something is bad because every nmethod has a non-zero frame size |
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176 // because the return address counts against the callee's frame. |
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177 |
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178 if (sender_blob->frame_size() == 0) { |
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179 assert(!sender_blob->is_nmethod(), "should count return address at least"); |
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180 return false; |
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181 } |
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182 |
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183 // We should never be able to see anything here except an nmethod. If something in the |
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184 // code cache (current frame) is called by an entity within the code cache that entity |
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185 // should not be anything but the call stub (already covered), the interpreter (already covered) |
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186 // or an nmethod. |
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187 |
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188 assert(sender_blob->is_nmethod(), "Impossible call chain"); |
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189 |
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190 // Could put some more validation for the potential non-interpreted sender |
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191 // frame we'd create by calling sender if I could think of any. Wait for next crash in forte... |
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192 |
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193 // One idea is seeing if the sender_pc we have is one that we'd expect to call to current cb |
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194 |
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195 // We've validated the potential sender that would be created |
| 0 | 196 return true; |
| 197 } | |
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198 |
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199 // Must be native-compiled frame. Since sender will try and use fp to find |
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200 // linkages it must be safe |
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201 |
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202 if (!fp_safe) { |
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203 return false; |
| 0 | 204 } |
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205 |
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206 // Will the pc we fetch be non-zero (which we'll find at the oldest frame) |
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207 |
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208 if ( (address) this->fp()[return_addr_offset] == NULL) return false; |
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209 |
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210 |
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211 // could try and do some more potential verification of native frame if we could think of some... |
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212 |
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213 return true; |
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214 |
| 0 | 215 } |
| 216 | |
| 217 | |
| 218 void frame::patch_pc(Thread* thread, address pc) { | |
| 219 if (TracePcPatching) { | |
| 304 | 220 tty->print_cr("patch_pc at address" INTPTR_FORMAT " [" INTPTR_FORMAT " -> " INTPTR_FORMAT "] ", |
| 221 &((address *)sp())[-1], ((address *)sp())[-1], pc); | |
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222 tty->print_cr("sp[0]: " INTPTR_FORMAT, ((intptr_t*)sp())[0]); |
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223 tty->print_cr("sp[1]: " INTPTR_FORMAT, ((intptr_t*)sp())[1]); |
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224 tty->print_cr("sp[2]: " INTPTR_FORMAT, ((intptr_t*)sp())[2]); |
| 0 | 225 } |
| 226 ((address *)sp())[-1] = pc; | |
| 227 _cb = CodeCache::find_blob(pc); | |
| 1204 | 228 address original_pc = nmethod::get_deopt_original_pc(this); |
| 229 if (original_pc != NULL) { | |
| 230 assert(original_pc == _pc, "expected original PC to be stored before patching"); | |
| 0 | 231 _deopt_state = is_deoptimized; |
| 232 // leave _pc as is | |
| 233 } else { | |
| 234 _deopt_state = not_deoptimized; | |
| 235 _pc = pc; | |
| 236 } | |
| 237 } | |
| 238 | |
| 239 bool frame::is_interpreted_frame() const { | |
| 240 return Interpreter::contains(pc()); | |
| 241 } | |
| 242 | |
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243 int frame::frame_size(RegisterMap* map) const { |
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244 frame sender = this->sender(map); |
| 0 | 245 return sender.sp() - sp(); |
| 246 } | |
| 247 | |
| 248 intptr_t* frame::entry_frame_argument_at(int offset) const { | |
| 249 // convert offset to index to deal with tsi | |
| 250 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize); | |
| 251 // Entry frame's arguments are always in relation to unextended_sp() | |
| 252 return &unextended_sp()[index]; | |
| 253 } | |
| 254 | |
| 255 // sender_sp | |
| 256 #ifdef CC_INTERP | |
| 257 intptr_t* frame::interpreter_frame_sender_sp() const { | |
| 258 assert(is_interpreted_frame(), "interpreted frame expected"); | |
| 259 // QQQ why does this specialize method exist if frame::sender_sp() does same thing? | |
| 260 // seems odd and if we always know interpreted vs. non then sender_sp() is really | |
| 261 // doing too much work. | |
| 262 return get_interpreterState()->sender_sp(); | |
| 263 } | |
| 264 | |
| 265 // monitor elements | |
| 266 | |
| 267 BasicObjectLock* frame::interpreter_frame_monitor_begin() const { | |
| 268 return get_interpreterState()->monitor_base(); | |
| 269 } | |
| 270 | |
| 271 BasicObjectLock* frame::interpreter_frame_monitor_end() const { | |
| 272 return (BasicObjectLock*) get_interpreterState()->stack_base(); | |
| 273 } | |
| 274 | |
| 275 #else // CC_INTERP | |
| 276 | |
| 277 intptr_t* frame::interpreter_frame_sender_sp() const { | |
| 278 assert(is_interpreted_frame(), "interpreted frame expected"); | |
| 279 return (intptr_t*) at(interpreter_frame_sender_sp_offset); | |
| 280 } | |
| 281 | |
| 282 void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) { | |
| 283 assert(is_interpreted_frame(), "interpreted frame expected"); | |
| 284 ptr_at_put(interpreter_frame_sender_sp_offset, (intptr_t) sender_sp); | |
| 285 } | |
| 286 | |
| 287 | |
| 288 // monitor elements | |
| 289 | |
| 290 BasicObjectLock* frame::interpreter_frame_monitor_begin() const { | |
| 291 return (BasicObjectLock*) addr_at(interpreter_frame_monitor_block_bottom_offset); | |
| 292 } | |
| 293 | |
| 294 BasicObjectLock* frame::interpreter_frame_monitor_end() const { | |
| 295 BasicObjectLock* result = (BasicObjectLock*) *addr_at(interpreter_frame_monitor_block_top_offset); | |
| 296 // make sure the pointer points inside the frame | |
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297 assert(sp() <= (intptr_t*) result, "monitor end should be above the stack pointer"); |
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298 assert((intptr_t*) result < fp(), "monitor end should be strictly below the frame pointer"); |
| 0 | 299 return result; |
| 300 } | |
| 301 | |
| 302 void frame::interpreter_frame_set_monitor_end(BasicObjectLock* value) { | |
| 303 *((BasicObjectLock**)addr_at(interpreter_frame_monitor_block_top_offset)) = value; | |
| 304 } | |
| 305 | |
| 306 // Used by template based interpreter deoptimization | |
| 307 void frame::interpreter_frame_set_last_sp(intptr_t* sp) { | |
| 308 *((intptr_t**)addr_at(interpreter_frame_last_sp_offset)) = sp; | |
| 309 } | |
| 310 #endif // CC_INTERP | |
| 311 | |
| 312 frame frame::sender_for_entry_frame(RegisterMap* map) const { | |
| 313 assert(map != NULL, "map must be set"); | |
| 314 // Java frame called from C; skip all C frames and return top C | |
| 315 // frame of that chunk as the sender | |
| 316 JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor(); | |
| 317 assert(!entry_frame_is_first(), "next Java fp must be non zero"); | |
| 318 assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack"); | |
| 319 map->clear(); | |
| 320 assert(map->include_argument_oops(), "should be set by clear"); | |
| 321 if (jfa->last_Java_pc() != NULL ) { | |
| 322 frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc()); | |
| 323 return fr; | |
| 324 } | |
| 325 frame fr(jfa->last_Java_sp(), jfa->last_Java_fp()); | |
| 326 return fr; | |
| 327 } | |
| 328 | |
| 1204 | 329 |
| 330 //------------------------------------------------------------------------------ | |
| 331 // frame::verify_deopt_original_pc | |
| 332 // | |
| 333 // Verifies the calculated original PC of a deoptimization PC for the | |
| 334 // given unextended SP. The unextended SP might also be the saved SP | |
| 335 // for MethodHandle call sites. | |
| 336 #if ASSERT | |
| 337 void frame::verify_deopt_original_pc(nmethod* nm, intptr_t* unextended_sp, bool is_method_handle_return) { | |
| 338 frame fr; | |
| 339 | |
| 340 // This is ugly but it's better than to change {get,set}_original_pc | |
| 341 // to take an SP value as argument. And it's only a debugging | |
| 342 // method anyway. | |
| 343 fr._unextended_sp = unextended_sp; | |
| 344 | |
| 345 address original_pc = nm->get_original_pc(&fr); | |
| 1748 | 346 assert(nm->insts_contains(original_pc), "original PC must be in nmethod"); |
| 1204 | 347 assert(nm->is_method_handle_return(original_pc) == is_method_handle_return, "must be"); |
| 348 } | |
| 349 #endif | |
| 350 | |
| 351 | |
| 352 //------------------------------------------------------------------------------ | |
| 353 // frame::sender_for_interpreter_frame | |
| 0 | 354 frame frame::sender_for_interpreter_frame(RegisterMap* map) const { |
| 1204 | 355 // SP is the raw SP from the sender after adapter or interpreter |
| 356 // extension. | |
| 357 intptr_t* sender_sp = this->sender_sp(); | |
| 0 | 358 |
| 359 // This is the sp before any possible extension (adapter/locals). | |
| 360 intptr_t* unextended_sp = interpreter_frame_sender_sp(); | |
| 361 | |
| 1204 | 362 // Stored FP. |
| 363 intptr_t* saved_fp = link(); | |
| 364 | |
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365 address sender_pc = this->sender_pc(); |
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366 CodeBlob* sender_cb = CodeCache::find_blob_unsafe(sender_pc); |
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367 assert(sender_cb, "sanity"); |
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368 nmethod* sender_nm = sender_cb->as_nmethod_or_null(); |
| 1204 | 369 |
| 370 if (sender_nm != NULL) { | |
| 371 // If the sender PC is a deoptimization point, get the original | |
| 372 // PC. For MethodHandle call site the unextended_sp is stored in | |
| 373 // saved_fp. | |
| 374 if (sender_nm->is_deopt_mh_entry(sender_pc)) { | |
| 375 DEBUG_ONLY(verify_deopt_mh_original_pc(sender_nm, saved_fp)); | |
| 376 unextended_sp = saved_fp; | |
| 377 } | |
| 378 else if (sender_nm->is_deopt_entry(sender_pc)) { | |
| 379 DEBUG_ONLY(verify_deopt_original_pc(sender_nm, unextended_sp)); | |
| 380 } | |
| 381 else if (sender_nm->is_method_handle_return(sender_pc)) { | |
| 382 unextended_sp = saved_fp; | |
| 383 } | |
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384 } |
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385 |
| 0 | 386 // The interpreter and compiler(s) always save EBP/RBP in a known |
| 387 // location on entry. We must record where that location is | |
| 388 // so this if EBP/RBP was live on callout from c2 we can find | |
| 389 // the saved copy no matter what it called. | |
| 390 | |
| 391 // Since the interpreter always saves EBP/RBP if we record where it is then | |
| 392 // we don't have to always save EBP/RBP on entry and exit to c2 compiled | |
| 393 // code, on entry will be enough. | |
| 394 #ifdef COMPILER2 | |
| 395 if (map->update_map()) { | |
| 396 map->set_location(rbp->as_VMReg(), (address) addr_at(link_offset)); | |
| 397 #ifdef AMD64 | |
| 398 // this is weird "H" ought to be at a higher address however the | |
| 399 // oopMaps seems to have the "H" regs at the same address and the | |
| 400 // vanilla register. | |
| 401 // XXXX make this go away | |
| 402 if (true) { | |
| 403 map->set_location(rbp->as_VMReg()->next(), (address)addr_at(link_offset)); | |
| 404 } | |
| 405 #endif // AMD64 | |
| 406 } | |
| 1204 | 407 #endif // COMPILER2 |
| 408 | |
| 409 return frame(sender_sp, unextended_sp, saved_fp, sender_pc); | |
| 0 | 410 } |
| 411 | |
| 412 | |
| 1204 | 413 //------------------------------------------------------------------------------ |
| 414 // frame::sender_for_compiled_frame | |
| 0 | 415 frame frame::sender_for_compiled_frame(RegisterMap* map) const { |
| 416 assert(map != NULL, "map must be set"); | |
| 417 | |
| 418 // frame owned by optimizing compiler | |
| 419 assert(_cb->frame_size() >= 0, "must have non-zero frame size"); | |
| 1204 | 420 intptr_t* sender_sp = unextended_sp() + _cb->frame_size(); |
| 421 intptr_t* unextended_sp = sender_sp; | |
| 0 | 422 |
| 423 // On Intel the return_address is always the word on the stack | |
| 424 address sender_pc = (address) *(sender_sp-1); | |
| 425 | |
| 1204 | 426 // This is the saved value of EBP which may or may not really be an FP. |
| 427 // It is only an FP if the sender is an interpreter frame (or C1?). | |
| 428 intptr_t* saved_fp = (intptr_t*) *(sender_sp - frame::sender_sp_offset); | |
| 0 | 429 |
| 1204 | 430 // If we are returning to a compiled MethodHandle call site, the |
| 431 // saved_fp will in fact be a saved value of the unextended SP. The | |
| 432 // simplest way to tell whether we are returning to such a call site | |
| 433 // is as follows: | |
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434 CodeBlob* sender_cb = CodeCache::find_blob_unsafe(sender_pc); |
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435 assert(sender_cb, "sanity"); |
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436 nmethod* sender_nm = sender_cb->as_nmethod_or_null(); |
| 1204 | 437 |
| 438 if (sender_nm != NULL) { | |
| 439 // If the sender PC is a deoptimization point, get the original | |
| 440 // PC. For MethodHandle call site the unextended_sp is stored in | |
| 441 // saved_fp. | |
| 442 if (sender_nm->is_deopt_mh_entry(sender_pc)) { | |
| 443 DEBUG_ONLY(verify_deopt_mh_original_pc(sender_nm, saved_fp)); | |
| 444 unextended_sp = saved_fp; | |
| 445 } | |
| 446 else if (sender_nm->is_deopt_entry(sender_pc)) { | |
| 447 DEBUG_ONLY(verify_deopt_original_pc(sender_nm, unextended_sp)); | |
| 448 } | |
| 449 else if (sender_nm->is_method_handle_return(sender_pc)) { | |
| 450 unextended_sp = saved_fp; | |
| 451 } | |
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452 } |
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453 |
| 0 | 454 if (map->update_map()) { |
| 455 // Tell GC to use argument oopmaps for some runtime stubs that need it. | |
| 456 // For C1, the runtime stub might not have oop maps, so set this flag | |
| 457 // outside of update_register_map. | |
| 458 map->set_include_argument_oops(_cb->caller_must_gc_arguments(map->thread())); | |
| 459 if (_cb->oop_maps() != NULL) { | |
| 460 OopMapSet::update_register_map(this, map); | |
| 461 } | |
| 1204 | 462 // Since the prolog does the save and restore of EBP there is no oopmap |
| 0 | 463 // for it so we must fill in its location as if there was an oopmap entry |
| 464 // since if our caller was compiled code there could be live jvm state in it. | |
| 465 map->set_location(rbp->as_VMReg(), (address) (sender_sp - frame::sender_sp_offset)); | |
| 466 #ifdef AMD64 | |
| 467 // this is weird "H" ought to be at a higher address however the | |
| 468 // oopMaps seems to have the "H" regs at the same address and the | |
| 469 // vanilla register. | |
| 470 // XXXX make this go away | |
| 471 if (true) { | |
| 472 map->set_location(rbp->as_VMReg()->next(), (address) (sender_sp - frame::sender_sp_offset)); | |
| 473 } | |
| 474 #endif // AMD64 | |
| 475 } | |
| 476 | |
| 477 assert(sender_sp != sp(), "must have changed"); | |
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478 return frame(sender_sp, unextended_sp, saved_fp, sender_pc); |
| 0 | 479 } |
| 480 | |
| 1204 | 481 |
| 482 //------------------------------------------------------------------------------ | |
| 483 // frame::sender | |
| 0 | 484 frame frame::sender(RegisterMap* map) const { |
| 485 // Default is we done have to follow them. The sender_for_xxx will | |
| 486 // update it accordingly | |
| 487 map->set_include_argument_oops(false); | |
| 488 | |
| 489 if (is_entry_frame()) return sender_for_entry_frame(map); | |
| 490 if (is_interpreted_frame()) return sender_for_interpreter_frame(map); | |
| 491 assert(_cb == CodeCache::find_blob(pc()),"Must be the same"); | |
| 492 | |
| 493 if (_cb != NULL) { | |
| 494 return sender_for_compiled_frame(map); | |
| 495 } | |
| 496 // Must be native-compiled frame, i.e. the marshaling code for native | |
| 497 // methods that exists in the core system. | |
| 498 return frame(sender_sp(), link(), sender_pc()); | |
| 499 } | |
| 500 | |
| 501 | |
| 502 bool frame::interpreter_frame_equals_unpacked_fp(intptr_t* fp) { | |
| 503 assert(is_interpreted_frame(), "must be interpreter frame"); | |
| 504 methodOop method = interpreter_frame_method(); | |
| 505 // When unpacking an optimized frame the frame pointer is | |
| 506 // adjusted with: | |
| 507 int diff = (method->max_locals() - method->size_of_parameters()) * | |
| 1506 | 508 Interpreter::stackElementWords; |
| 0 | 509 return _fp == (fp - diff); |
| 510 } | |
| 511 | |
| 512 void frame::pd_gc_epilog() { | |
| 513 // nothing done here now | |
| 514 } | |
| 515 | |
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516 bool frame::is_interpreted_frame_valid(JavaThread* thread) const { |
| 0 | 517 // QQQ |
| 518 #ifdef CC_INTERP | |
| 519 #else | |
| 520 assert(is_interpreted_frame(), "Not an interpreted frame"); | |
| 521 // These are reasonable sanity checks | |
| 522 if (fp() == 0 || (intptr_t(fp()) & (wordSize-1)) != 0) { | |
| 523 return false; | |
| 524 } | |
| 525 if (sp() == 0 || (intptr_t(sp()) & (wordSize-1)) != 0) { | |
| 526 return false; | |
| 527 } | |
| 528 if (fp() + interpreter_frame_initial_sp_offset < sp()) { | |
| 529 return false; | |
| 530 } | |
| 531 // These are hacks to keep us out of trouble. | |
| 532 // The problem with these is that they mask other problems | |
| 533 if (fp() <= sp()) { // this attempts to deal with unsigned comparison above | |
| 534 return false; | |
| 535 } | |
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536 |
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537 // do some validation of frame elements |
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538 |
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539 // first the method |
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540 |
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541 methodOop m = *interpreter_frame_method_addr(); |
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542 |
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543 // validate the method we'd find in this potential sender |
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544 if (!Universe::heap()->is_valid_method(m)) return false; |
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545 |
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546 // stack frames shouldn't be much larger than max_stack elements |
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547 |
| 1506 | 548 if (fp() - sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) { |
| 0 | 549 return false; |
| 550 } | |
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551 |
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552 // validate bci/bcx |
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553 |
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554 intptr_t bcx = interpreter_frame_bcx(); |
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555 if (m->validate_bci_from_bcx(bcx) < 0) { |
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556 return false; |
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557 } |
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558 |
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559 // validate constantPoolCacheOop |
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560 |
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561 constantPoolCacheOop cp = *interpreter_frame_cache_addr(); |
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562 |
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563 if (cp == NULL || |
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564 !Space::is_aligned(cp) || |
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565 !Universe::heap()->is_permanent((void*)cp)) return false; |
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566 |
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567 // validate locals |
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568 |
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569 address locals = (address) *interpreter_frame_locals_addr(); |
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570 |
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571 if (locals > thread->stack_base() || locals < (address) fp()) return false; |
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572 |
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573 // We'd have to be pretty unlucky to be mislead at this point |
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574 |
| 0 | 575 #endif // CC_INTERP |
| 576 return true; | |
| 577 } | |
| 578 | |
| 579 BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) { | |
| 580 #ifdef CC_INTERP | |
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581 // Needed for JVMTI. The result should always be in the |
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582 // interpreterState object |
| 0 | 583 interpreterState istate = get_interpreterState(); |
| 584 #endif // CC_INTERP | |
| 585 assert(is_interpreted_frame(), "interpreted frame expected"); | |
| 586 methodOop method = interpreter_frame_method(); | |
| 587 BasicType type = method->result_type(); | |
| 588 | |
| 589 intptr_t* tos_addr; | |
| 590 if (method->is_native()) { | |
| 591 // Prior to calling into the runtime to report the method_exit the possible | |
| 592 // return value is pushed to the native stack. If the result is a jfloat/jdouble | |
| 593 // then ST0 is saved before EAX/EDX. See the note in generate_native_result | |
| 594 tos_addr = (intptr_t*)sp(); | |
| 595 if (type == T_FLOAT || type == T_DOUBLE) { | |
| 596 // QQQ seems like this code is equivalent on the two platforms | |
| 597 #ifdef AMD64 | |
| 598 // This is times two because we do a push(ltos) after pushing XMM0 | |
| 599 // and that takes two interpreter stack slots. | |
| 1506 | 600 tos_addr += 2 * Interpreter::stackElementWords; |
| 0 | 601 #else |
| 602 tos_addr += 2; | |
| 603 #endif // AMD64 | |
| 604 } | |
| 605 } else { | |
| 606 tos_addr = (intptr_t*)interpreter_frame_tos_address(); | |
| 607 } | |
| 608 | |
| 609 switch (type) { | |
| 610 case T_OBJECT : | |
| 611 case T_ARRAY : { | |
| 612 oop obj; | |
| 613 if (method->is_native()) { | |
| 614 #ifdef CC_INTERP | |
| 615 obj = istate->_oop_temp; | |
| 616 #else | |
| 617 obj = (oop) at(interpreter_frame_oop_temp_offset); | |
| 618 #endif // CC_INTERP | |
| 619 } else { | |
| 620 oop* obj_p = (oop*)tos_addr; | |
| 621 obj = (obj_p == NULL) ? (oop)NULL : *obj_p; | |
| 622 } | |
| 623 assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check"); | |
| 624 *oop_result = obj; | |
| 625 break; | |
| 626 } | |
| 627 case T_BOOLEAN : value_result->z = *(jboolean*)tos_addr; break; | |
| 628 case T_BYTE : value_result->b = *(jbyte*)tos_addr; break; | |
| 629 case T_CHAR : value_result->c = *(jchar*)tos_addr; break; | |
| 630 case T_SHORT : value_result->s = *(jshort*)tos_addr; break; | |
| 631 case T_INT : value_result->i = *(jint*)tos_addr; break; | |
| 632 case T_LONG : value_result->j = *(jlong*)tos_addr; break; | |
| 633 case T_FLOAT : { | |
| 634 #ifdef AMD64 | |
| 635 value_result->f = *(jfloat*)tos_addr; | |
| 636 #else | |
| 637 if (method->is_native()) { | |
| 638 jdouble d = *(jdouble*)tos_addr; // Result was in ST0 so need to convert to jfloat | |
| 639 value_result->f = (jfloat)d; | |
| 640 } else { | |
| 641 value_result->f = *(jfloat*)tos_addr; | |
| 642 } | |
| 643 #endif // AMD64 | |
| 644 break; | |
| 645 } | |
| 646 case T_DOUBLE : value_result->d = *(jdouble*)tos_addr; break; | |
| 647 case T_VOID : /* Nothing to do */ break; | |
| 648 default : ShouldNotReachHere(); | |
| 649 } | |
| 650 | |
| 651 return type; | |
| 652 } | |
| 653 | |
| 654 | |
| 655 intptr_t* frame::interpreter_frame_tos_at(jint offset) const { | |
| 656 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize); | |
| 657 return &interpreter_frame_tos_address()[index]; | |
| 658 } |