Mercurial > hg > truffle
annotate src/cpu/sparc/vm/frame_sparc.cpp @ 107:93b6525e3b82
6603919: Stackwalking crash on x86 -server with Sun Studio's collect -j on
Summary: Rewrite frame::safe_for_sender and friends to be safe for collector/analyzer
Reviewed-by: dcubed, kvn
| author | sgoldman |
|---|---|
| date | Tue, 08 Apr 2008 12:23:15 -0400 |
| parents | a61af66fc99e |
| children | d1605aabd0a1 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved. | |
| 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_frame_sparc.cpp.incl" | |
| 27 | |
| 28 void RegisterMap::pd_clear() { | |
| 29 if (_thread->has_last_Java_frame()) { | |
| 30 frame fr = _thread->last_frame(); | |
| 31 _window = fr.sp(); | |
| 32 } else { | |
| 33 _window = NULL; | |
| 34 } | |
| 35 _younger_window = NULL; | |
| 36 } | |
| 37 | |
| 38 | |
| 39 // Unified register numbering scheme: each 32-bits counts as a register | |
| 40 // number, so all the V9 registers take 2 slots. | |
| 41 const static int R_L_nums[] = {0+040,2+040,4+040,6+040,8+040,10+040,12+040,14+040}; | |
| 42 const static int R_I_nums[] = {0+060,2+060,4+060,6+060,8+060,10+060,12+060,14+060}; | |
| 43 const static int R_O_nums[] = {0+020,2+020,4+020,6+020,8+020,10+020,12+020,14+020}; | |
| 44 const static int R_G_nums[] = {0+000,2+000,4+000,6+000,8+000,10+000,12+000,14+000}; | |
| 45 static RegisterMap::LocationValidType bad_mask = 0; | |
| 46 static RegisterMap::LocationValidType R_LIO_mask = 0; | |
| 47 static bool register_map_inited = false; | |
| 48 | |
| 49 static void register_map_init() { | |
| 50 if (!register_map_inited) { | |
| 51 register_map_inited = true; | |
| 52 int i; | |
| 53 for (i = 0; i < 8; i++) { | |
| 54 assert(R_L_nums[i] < RegisterMap::location_valid_type_size, "in first chunk"); | |
| 55 assert(R_I_nums[i] < RegisterMap::location_valid_type_size, "in first chunk"); | |
| 56 assert(R_O_nums[i] < RegisterMap::location_valid_type_size, "in first chunk"); | |
| 57 assert(R_G_nums[i] < RegisterMap::location_valid_type_size, "in first chunk"); | |
| 58 } | |
| 59 | |
| 60 bad_mask |= (1LL << R_O_nums[6]); // SP | |
| 61 bad_mask |= (1LL << R_O_nums[7]); // cPC | |
| 62 bad_mask |= (1LL << R_I_nums[6]); // FP | |
| 63 bad_mask |= (1LL << R_I_nums[7]); // rPC | |
| 64 bad_mask |= (1LL << R_G_nums[2]); // TLS | |
| 65 bad_mask |= (1LL << R_G_nums[7]); // reserved by libthread | |
| 66 | |
| 67 for (i = 0; i < 8; i++) { | |
| 68 R_LIO_mask |= (1LL << R_L_nums[i]); | |
| 69 R_LIO_mask |= (1LL << R_I_nums[i]); | |
| 70 R_LIO_mask |= (1LL << R_O_nums[i]); | |
| 71 } | |
| 72 } | |
| 73 } | |
| 74 | |
| 75 | |
| 76 address RegisterMap::pd_location(VMReg regname) const { | |
| 77 register_map_init(); | |
| 78 | |
| 79 assert(regname->is_reg(), "sanity check"); | |
| 80 // Only the GPRs get handled this way | |
| 81 if( !regname->is_Register()) | |
| 82 return NULL; | |
| 83 | |
| 84 // don't talk about bad registers | |
| 85 if ((bad_mask & ((LocationValidType)1 << regname->value())) != 0) { | |
| 86 return NULL; | |
| 87 } | |
| 88 | |
| 89 // Convert to a GPR | |
| 90 Register reg; | |
| 91 int second_word = 0; | |
| 92 // 32-bit registers for in, out and local | |
| 93 if (!regname->is_concrete()) { | |
| 94 // HMM ought to return NULL for any non-concrete (odd) vmreg | |
| 95 // this all tied up in the fact we put out double oopMaps for | |
| 96 // register locations. When that is fixed we'd will return NULL | |
| 97 // (or assert here). | |
| 98 reg = regname->prev()->as_Register(); | |
| 99 #ifdef _LP64 | |
| 100 second_word = sizeof(jint); | |
| 101 #else | |
| 102 return NULL; | |
| 103 #endif // _LP64 | |
| 104 } else { | |
| 105 reg = regname->as_Register(); | |
| 106 } | |
| 107 if (reg->is_out()) { | |
| 108 assert(_younger_window != NULL, "Younger window should be available"); | |
| 109 return second_word + (address)&_younger_window[reg->after_save()->sp_offset_in_saved_window()]; | |
| 110 } | |
| 111 if (reg->is_local() || reg->is_in()) { | |
| 112 assert(_window != NULL, "Window should be available"); | |
| 113 return second_word + (address)&_window[reg->sp_offset_in_saved_window()]; | |
| 114 } | |
| 115 // Only the window'd GPRs get handled this way; not the globals. | |
| 116 return NULL; | |
| 117 } | |
| 118 | |
| 119 | |
| 120 #ifdef ASSERT | |
| 121 void RegisterMap::check_location_valid() { | |
| 122 register_map_init(); | |
| 123 assert((_location_valid[0] & bad_mask) == 0, "cannot have special locations for SP,FP,TLS,etc."); | |
| 124 } | |
| 125 #endif | |
| 126 | |
| 127 // We are shifting windows. That means we are moving all %i to %o, | |
| 128 // getting rid of all current %l, and keeping all %g. This is only | |
| 129 // complicated if any of the location pointers for these are valid. | |
| 130 // The normal case is that everything is in its standard register window | |
| 131 // home, and _location_valid[0] is zero. In that case, this routine | |
| 132 // does exactly nothing. | |
| 133 void RegisterMap::shift_individual_registers() { | |
| 134 if (!update_map()) return; // this only applies to maps with locations | |
| 135 register_map_init(); | |
| 136 check_location_valid(); | |
| 137 | |
| 138 LocationValidType lv = _location_valid[0]; | |
| 139 LocationValidType lv0 = lv; | |
| 140 | |
| 141 lv &= ~R_LIO_mask; // clear %l, %o, %i regs | |
| 142 | |
| 143 // if we cleared some non-%g locations, we may have to do some shifting | |
| 144 if (lv != lv0) { | |
| 145 // copy %i0-%i5 to %o0-%o5, if they have special locations | |
| 146 // This can happen in within stubs which spill argument registers | |
| 147 // around a dynamic link operation, such as resolve_opt_virtual_call. | |
| 148 for (int i = 0; i < 8; i++) { | |
| 149 if (lv0 & (1LL << R_I_nums[i])) { | |
| 150 _location[R_O_nums[i]] = _location[R_I_nums[i]]; | |
| 151 lv |= (1LL << R_O_nums[i]); | |
| 152 } | |
| 153 } | |
| 154 } | |
| 155 | |
| 156 _location_valid[0] = lv; | |
| 157 check_location_valid(); | |
| 158 } | |
| 159 | |
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160 bool frame::safe_for_sender(JavaThread *thread) { |
| 0 | 161 |
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162 address _SP = (address) sp(); |
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163 address _FP = (address) fp(); |
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164 address _UNEXTENDED_SP = (address) unextended_sp(); |
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165 // sp must be within the stack |
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166 bool sp_safe = (_SP <= thread->stack_base()) && |
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167 (_SP >= thread->stack_base() - thread->stack_size()); |
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168 |
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169 if (!sp_safe) { |
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170 return false; |
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171 } |
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172 |
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173 // unextended sp must be within the stack and above or equal sp |
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174 bool unextended_sp_safe = (_UNEXTENDED_SP <= thread->stack_base()) && |
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175 (_UNEXTENDED_SP >= _SP); |
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176 |
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177 if (!unextended_sp_safe) return false; |
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178 |
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179 // an fp must be within the stack and above (but not equal) sp |
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180 bool fp_safe = (_FP <= thread->stack_base()) && |
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181 (_FP > _SP); |
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182 |
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183 // We know sp/unextended_sp are safe only fp is questionable here |
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184 |
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185 // If the current frame is known to the code cache then we can attempt to |
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186 // to construct the sender and do some validation of it. This goes a long way |
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187 // toward eliminating issues when we get in frame construction code |
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188 |
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189 if (_cb != NULL ) { |
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190 |
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191 // First check if frame is complete and tester is reliable |
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192 // Unfortunately we can only check frame complete for runtime stubs and nmethod |
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193 // other generic buffer blobs are more problematic so we just assume they are |
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194 // ok. adapter blobs never have a frame complete and are never ok. |
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195 |
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196 if (!_cb->is_frame_complete_at(_pc)) { |
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197 if (_cb->is_nmethod() || _cb->is_adapter_blob() || _cb->is_runtime_stub()) { |
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198 return false; |
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199 } |
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200 } |
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201 |
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202 // Entry frame checks |
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203 if (is_entry_frame()) { |
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204 // an entry frame must have a valid fp. |
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205 |
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206 if (!fp_safe) { |
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207 return false; |
| 0 | 208 } |
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209 |
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210 // Validate the JavaCallWrapper an entry frame must have |
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211 |
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212 address jcw = (address)entry_frame_call_wrapper(); |
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213 |
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214 bool jcw_safe = (jcw <= thread->stack_base()) && ( jcw > _FP); |
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215 |
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216 return jcw_safe; |
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217 |
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218 } |
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219 |
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220 intptr_t* younger_sp = sp(); |
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221 intptr_t* _SENDER_SP = sender_sp(); // sender is actually just _FP |
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222 bool adjusted_stack = is_interpreted_frame(); |
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223 |
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224 address sender_pc = (address)younger_sp[I7->sp_offset_in_saved_window()] + pc_return_offset; |
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225 |
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226 |
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227 // We must always be able to find a recognizable pc |
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228 CodeBlob* sender_blob = CodeCache::find_blob_unsafe(sender_pc); |
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229 if (sender_pc == NULL || sender_blob == NULL) { |
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230 return false; |
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231 } |
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232 |
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233 // It should be safe to construct the sender though it might not be valid |
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234 |
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235 frame sender(_SENDER_SP, younger_sp, adjusted_stack); |
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236 |
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237 // Do we have a valid fp? |
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238 address sender_fp = (address) sender.fp(); |
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239 |
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240 // an fp must be within the stack and above (but not equal) current frame's _FP |
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241 |
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242 bool sender_fp_safe = (sender_fp <= thread->stack_base()) && |
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243 (sender_fp > _FP); |
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244 |
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245 if (!sender_fp_safe) { |
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246 return false; |
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247 } |
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248 |
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249 |
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250 // If the potential sender is the interpreter then we can do some more checking |
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251 if (Interpreter::contains(sender_pc)) { |
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252 return sender.is_interpreted_frame_valid(thread); |
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253 } |
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254 |
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255 // Could just be some random pointer within the codeBlob |
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256 if (!sender.cb()->instructions_contains(sender_pc)) return false; |
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257 |
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258 // We should never be able to see an adapter if the current frame is something from code cache |
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259 |
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260 if ( sender_blob->is_adapter_blob()) { |
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261 return false; |
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262 } |
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263 |
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264 if( sender.is_entry_frame()) { |
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265 // Validate the JavaCallWrapper an entry frame must have |
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266 |
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267 address jcw = (address)sender.entry_frame_call_wrapper(); |
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268 |
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269 bool jcw_safe = (jcw <= thread->stack_base()) && ( jcw > sender_fp); |
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270 |
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271 return jcw_safe; |
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272 } |
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273 |
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274 // If the frame size is 0 something is bad because every nmethod has a non-zero frame size |
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275 // because you must allocate window space |
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276 |
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277 if (sender_blob->frame_size() == 0) { |
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278 assert(!sender_blob->is_nmethod(), "should count return address at least"); |
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279 return false; |
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280 } |
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281 |
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282 // The sender should positively be an nmethod or call_stub. On sparc we might in fact see something else. |
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283 // The cause of this is because at a save instruction the O7 we get is a leftover from an earlier |
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284 // window use. So if a runtime stub creates two frames (common in fastdebug/jvmg) then we see the |
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285 // stale pc. So if the sender blob is not something we'd expect we have little choice but to declare |
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286 // the stack unwalkable. pd_get_top_frame_for_signal_handler tries to recover from this by unwinding |
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287 // that initial frame and retrying. |
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288 |
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289 if (!sender_blob->is_nmethod()) { |
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290 return false; |
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291 } |
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292 |
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293 // Could put some more validation for the potential non-interpreted sender |
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294 // frame we'd create by calling sender if I could think of any. Wait for next crash in forte... |
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295 |
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296 // 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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297 |
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298 // We've validated the potential sender that would be created |
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299 |
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300 return true; |
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301 |
| 0 | 302 } |
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107
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303 |
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304 // Must be native-compiled frame. Since sender will try and use fp to find |
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305 // linkages it must be safe |
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306 |
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307 if (!fp_safe) return false; |
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308 |
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309 // could try and do some more potential verification of native frame if we could think of some... |
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310 |
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311 return true; |
| 0 | 312 } |
| 313 | |
| 314 // constructors | |
| 315 | |
| 316 // Construct an unpatchable, deficient frame | |
| 317 frame::frame(intptr_t* sp, unpatchable_t, address pc, CodeBlob* cb) { | |
| 318 #ifdef _LP64 | |
| 319 assert( (((intptr_t)sp & (wordSize-1)) == 0), "frame constructor passed an invalid sp"); | |
| 320 #endif | |
| 321 _sp = sp; | |
| 322 _younger_sp = NULL; | |
| 323 _pc = pc; | |
| 324 _cb = cb; | |
| 325 _sp_adjustment_by_callee = 0; | |
| 326 assert(pc == NULL && cb == NULL || pc != NULL, "can't have a cb and no pc!"); | |
| 327 if (_cb == NULL && _pc != NULL ) { | |
| 328 _cb = CodeCache::find_blob(_pc); | |
| 329 } | |
| 330 _deopt_state = unknown; | |
| 331 #ifdef ASSERT | |
| 332 if ( _cb != NULL && _cb->is_nmethod()) { | |
| 333 // Without a valid unextended_sp() we can't convert the pc to "original" | |
| 334 assert(!((nmethod*)_cb)->is_deopt_pc(_pc), "invariant broken"); | |
| 335 } | |
| 336 #endif // ASSERT | |
| 337 } | |
| 338 | |
| 339 frame::frame(intptr_t* sp, intptr_t* younger_sp, bool younger_frame_adjusted_stack) { | |
| 340 _sp = sp; | |
| 341 _younger_sp = younger_sp; | |
| 342 if (younger_sp == NULL) { | |
| 343 // make a deficient frame which doesn't know where its PC is | |
| 344 _pc = NULL; | |
| 345 _cb = NULL; | |
| 346 } else { | |
| 347 _pc = (address)younger_sp[I7->sp_offset_in_saved_window()] + pc_return_offset; | |
| 348 assert( (intptr_t*)younger_sp[FP->sp_offset_in_saved_window()] == (intptr_t*)((intptr_t)sp - STACK_BIAS), "younger_sp must be valid"); | |
| 349 // Any frame we ever build should always "safe" therefore we should not have to call | |
| 350 // find_blob_unsafe | |
| 351 // In case of native stubs, the pc retrieved here might be | |
| 352 // wrong. (the _last_native_pc will have the right value) | |
| 353 // So do not put add any asserts on the _pc here. | |
| 354 } | |
| 355 if (younger_frame_adjusted_stack) { | |
| 356 // compute adjustment to this frame's SP made by its interpreted callee | |
| 357 _sp_adjustment_by_callee = (intptr_t*)((intptr_t)younger_sp[I5_savedSP->sp_offset_in_saved_window()] + | |
| 358 STACK_BIAS) - sp; | |
| 359 } else { | |
| 360 _sp_adjustment_by_callee = 0; | |
| 361 } | |
| 362 | |
| 363 _deopt_state = unknown; | |
| 364 | |
| 365 // It is important that frame be fully construct when we do this lookup | |
| 366 // as get_original_pc() needs correct value for unextended_sp() | |
| 367 if (_pc != NULL) { | |
| 368 _cb = CodeCache::find_blob(_pc); | |
| 369 if (_cb != NULL && _cb->is_nmethod() && ((nmethod*)_cb)->is_deopt_pc(_pc)) { | |
| 370 _pc = ((nmethod*)_cb)->get_original_pc(this); | |
| 371 _deopt_state = is_deoptimized; | |
| 372 } else { | |
| 373 _deopt_state = not_deoptimized; | |
| 374 } | |
| 375 } | |
| 376 } | |
| 377 | |
| 378 bool frame::is_interpreted_frame() const { | |
| 379 return Interpreter::contains(pc()); | |
| 380 } | |
| 381 | |
| 382 // sender_sp | |
| 383 | |
| 384 intptr_t* frame::interpreter_frame_sender_sp() const { | |
| 385 assert(is_interpreted_frame(), "interpreted frame expected"); | |
| 386 return fp(); | |
| 387 } | |
| 388 | |
| 389 #ifndef CC_INTERP | |
| 390 void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) { | |
| 391 assert(is_interpreted_frame(), "interpreted frame expected"); | |
| 392 Unimplemented(); | |
| 393 } | |
| 394 #endif // CC_INTERP | |
| 395 | |
| 396 | |
| 397 #ifdef ASSERT | |
| 398 // Debugging aid | |
| 399 static frame nth_sender(int n) { | |
| 400 frame f = JavaThread::current()->last_frame(); | |
| 401 | |
| 402 for(int i = 0; i < n; ++i) | |
| 403 f = f.sender((RegisterMap*)NULL); | |
| 404 | |
| 405 printf("first frame %d\n", f.is_first_frame() ? 1 : 0); | |
| 406 printf("interpreted frame %d\n", f.is_interpreted_frame() ? 1 : 0); | |
| 407 printf("java frame %d\n", f.is_java_frame() ? 1 : 0); | |
| 408 printf("entry frame %d\n", f.is_entry_frame() ? 1 : 0); | |
| 409 printf("native frame %d\n", f.is_native_frame() ? 1 : 0); | |
| 410 if (f.is_compiled_frame()) { | |
| 411 if (f.is_deoptimized_frame()) | |
| 412 printf("deoptimized frame 1\n"); | |
| 413 else | |
| 414 printf("compiled frame 1\n"); | |
| 415 } | |
| 416 | |
| 417 return f; | |
| 418 } | |
| 419 #endif | |
| 420 | |
| 421 | |
| 422 frame frame::sender_for_entry_frame(RegisterMap *map) const { | |
| 423 assert(map != NULL, "map must be set"); | |
| 424 // Java frame called from C; skip all C frames and return top C | |
| 425 // frame of that chunk as the sender | |
| 426 JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor(); | |
| 427 assert(!entry_frame_is_first(), "next Java fp must be non zero"); | |
| 428 assert(jfa->last_Java_sp() > _sp, "must be above this frame on stack"); | |
| 429 intptr_t* last_Java_sp = jfa->last_Java_sp(); | |
| 430 // Since we are walking the stack now this nested anchor is obviously walkable | |
| 431 // even if it wasn't when it was stacked. | |
| 432 if (!jfa->walkable()) { | |
| 433 // Capture _last_Java_pc (if needed) and mark anchor walkable. | |
| 434 jfa->capture_last_Java_pc(_sp); | |
| 435 } | |
| 436 assert(jfa->last_Java_pc() != NULL, "No captured pc!"); | |
| 437 map->clear(); | |
| 438 map->make_integer_regs_unsaved(); | |
| 439 map->shift_window(last_Java_sp, NULL); | |
| 440 assert(map->include_argument_oops(), "should be set by clear"); | |
| 441 return frame(last_Java_sp, frame::unpatchable, jfa->last_Java_pc()); | |
| 442 } | |
| 443 | |
| 444 frame frame::sender_for_interpreter_frame(RegisterMap *map) const { | |
| 445 ShouldNotCallThis(); | |
| 446 return sender(map); | |
| 447 } | |
| 448 | |
| 449 frame frame::sender_for_compiled_frame(RegisterMap *map) const { | |
| 450 ShouldNotCallThis(); | |
| 451 return sender(map); | |
| 452 } | |
| 453 | |
| 454 frame frame::sender(RegisterMap* map) const { | |
| 455 assert(map != NULL, "map must be set"); | |
| 456 | |
| 457 assert(CodeCache::find_blob_unsafe(_pc) == _cb, "inconsistent"); | |
| 458 | |
| 459 // Default is not to follow arguments; update it accordingly below | |
| 460 map->set_include_argument_oops(false); | |
| 461 | |
| 462 if (is_entry_frame()) return sender_for_entry_frame(map); | |
| 463 | |
| 464 intptr_t* younger_sp = sp(); | |
| 465 intptr_t* sp = sender_sp(); | |
| 466 bool adjusted_stack = false; | |
| 467 | |
| 468 // Note: The version of this operation on any platform with callee-save | |
| 469 // registers must update the register map (if not null). | |
| 470 // In order to do this correctly, the various subtypes of | |
| 471 // of frame (interpreted, compiled, glue, native), | |
| 472 // must be distinguished. There is no need on SPARC for | |
| 473 // such distinctions, because all callee-save registers are | |
| 474 // preserved for all frames via SPARC-specific mechanisms. | |
| 475 // | |
| 476 // *** HOWEVER, *** if and when we make any floating-point | |
| 477 // registers callee-saved, then we will have to copy over | |
| 478 // the RegisterMap update logic from the Intel code. | |
| 479 | |
| 480 // The constructor of the sender must know whether this frame is interpreted so it can set the | |
| 481 // sender's _sp_adjustment_by_callee field. An osr adapter frame was originally | |
| 482 // interpreted but its pc is in the code cache (for c1 -> osr_frame_return_id stub), so it must be | |
| 483 // explicitly recognized. | |
| 484 | |
| 485 adjusted_stack = is_interpreted_frame(); | |
| 486 if (adjusted_stack) { | |
| 487 map->make_integer_regs_unsaved(); | |
| 488 map->shift_window(sp, younger_sp); | |
| 489 } else if (_cb != NULL) { | |
| 490 // Update the locations of implicitly saved registers to be their | |
| 491 // addresses in the register save area. | |
| 492 // For %o registers, the addresses of %i registers in the next younger | |
| 493 // frame are used. | |
| 494 map->shift_window(sp, younger_sp); | |
| 495 if (map->update_map()) { | |
| 496 // Tell GC to use argument oopmaps for some runtime stubs that need it. | |
| 497 // For C1, the runtime stub might not have oop maps, so set this flag | |
| 498 // outside of update_register_map. | |
| 499 map->set_include_argument_oops(_cb->caller_must_gc_arguments(map->thread())); | |
| 500 if (_cb->oop_maps() != NULL) { | |
| 501 OopMapSet::update_register_map(this, map); | |
| 502 } | |
| 503 } | |
| 504 } | |
| 505 return frame(sp, younger_sp, adjusted_stack); | |
| 506 } | |
| 507 | |
| 508 | |
| 509 void frame::patch_pc(Thread* thread, address pc) { | |
| 510 if(thread == Thread::current()) { | |
| 511 StubRoutines::Sparc::flush_callers_register_windows_func()(); | |
| 512 } | |
| 513 if (TracePcPatching) { | |
| 514 // QQQ this assert is invalid (or too strong anyway) sice _pc could | |
| 515 // be original pc and frame could have the deopt pc. | |
| 516 // assert(_pc == *O7_addr() + pc_return_offset, "frame has wrong pc"); | |
| 517 tty->print_cr("patch_pc at address 0x%x [0x%x -> 0x%x] ", O7_addr(), _pc, pc); | |
| 518 } | |
| 519 _cb = CodeCache::find_blob(pc); | |
| 520 *O7_addr() = pc - pc_return_offset; | |
| 521 _cb = CodeCache::find_blob(_pc); | |
| 522 if (_cb != NULL && _cb->is_nmethod() && ((nmethod*)_cb)->is_deopt_pc(_pc)) { | |
| 523 address orig = ((nmethod*)_cb)->get_original_pc(this); | |
| 524 assert(orig == _pc, "expected original to be stored before patching"); | |
| 525 _deopt_state = is_deoptimized; | |
| 526 } else { | |
| 527 _deopt_state = not_deoptimized; | |
| 528 } | |
| 529 } | |
| 530 | |
| 531 | |
| 532 static bool sp_is_valid(intptr_t* old_sp, intptr_t* young_sp, intptr_t* sp) { | |
| 533 return (((intptr_t)sp & (2*wordSize-1)) == 0 && | |
| 534 sp <= old_sp && | |
| 535 sp >= young_sp); | |
| 536 } | |
| 537 | |
| 538 | |
| 539 /* | |
| 540 Find the (biased) sp that is just younger than old_sp starting at sp. | |
| 541 If not found return NULL. Register windows are assumed to be flushed. | |
| 542 */ | |
| 543 intptr_t* frame::next_younger_sp_or_null(intptr_t* old_sp, intptr_t* sp) { | |
| 544 | |
| 545 intptr_t* previous_sp = NULL; | |
| 546 intptr_t* orig_sp = sp; | |
| 547 | |
| 548 int max_frames = (old_sp - sp) / 16; // Minimum frame size is 16 | |
| 549 int max_frame2 = max_frames; | |
| 550 while(sp != old_sp && sp_is_valid(old_sp, orig_sp, sp)) { | |
| 551 if (max_frames-- <= 0) | |
| 552 // too many frames have gone by; invalid parameters given to this function | |
| 553 break; | |
| 554 previous_sp = sp; | |
| 555 sp = (intptr_t*)sp[FP->sp_offset_in_saved_window()]; | |
| 556 sp = (intptr_t*)((intptr_t)sp + STACK_BIAS); | |
| 557 } | |
| 558 | |
| 559 return (sp == old_sp ? previous_sp : NULL); | |
| 560 } | |
| 561 | |
| 562 /* | |
| 563 Determine if "sp" is a valid stack pointer. "sp" is assumed to be younger than | |
| 564 "valid_sp". So if "sp" is valid itself then it should be possible to walk frames | |
| 565 from "sp" to "valid_sp". The assumption is that the registers windows for the | |
| 566 thread stack in question are flushed. | |
| 567 */ | |
| 568 bool frame::is_valid_stack_pointer(intptr_t* valid_sp, intptr_t* sp) { | |
| 569 return next_younger_sp_or_null(valid_sp, sp) != NULL; | |
| 570 } | |
| 571 | |
| 572 | |
| 573 bool frame::interpreter_frame_equals_unpacked_fp(intptr_t* fp) { | |
| 574 assert(is_interpreted_frame(), "must be interpreter frame"); | |
| 575 return this->fp() == fp; | |
| 576 } | |
| 577 | |
| 578 | |
| 579 void frame::pd_gc_epilog() { | |
| 580 if (is_interpreted_frame()) { | |
| 581 // set constant pool cache entry for interpreter | |
| 582 methodOop m = interpreter_frame_method(); | |
| 583 | |
| 584 *interpreter_frame_cpoolcache_addr() = m->constants()->cache(); | |
| 585 } | |
| 586 } | |
| 587 | |
| 588 | |
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589 bool frame::is_interpreted_frame_valid(JavaThread* thread) const { |
| 0 | 590 #ifdef CC_INTERP |
| 591 // Is there anything to do? | |
| 592 #else | |
| 593 assert(is_interpreted_frame(), "Not an interpreted frame"); | |
| 594 // These are reasonable sanity checks | |
| 595 if (fp() == 0 || (intptr_t(fp()) & (2*wordSize-1)) != 0) { | |
| 596 return false; | |
| 597 } | |
| 598 if (sp() == 0 || (intptr_t(sp()) & (2*wordSize-1)) != 0) { | |
| 599 return false; | |
| 600 } | |
|
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601 |
| 0 | 602 const intptr_t interpreter_frame_initial_sp_offset = interpreter_frame_vm_local_words; |
| 603 if (fp() + interpreter_frame_initial_sp_offset < sp()) { | |
| 604 return false; | |
| 605 } | |
| 606 // These are hacks to keep us out of trouble. | |
| 607 // The problem with these is that they mask other problems | |
| 608 if (fp() <= sp()) { // this attempts to deal with unsigned comparison above | |
| 609 return false; | |
| 610 } | |
|
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611 // do some validation of frame elements |
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612 |
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613 // first the method |
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614 |
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615 methodOop m = *interpreter_frame_method_addr(); |
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616 |
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617 // validate the method we'd find in this potential sender |
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618 if (!Universe::heap()->is_valid_method(m)) return false; |
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619 |
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620 // stack frames shouldn't be much larger than max_stack elements |
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621 |
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622 if (fp() - sp() > 1024 + m->max_stack()*Interpreter::stackElementSize()) { |
| 0 | 623 return false; |
| 624 } | |
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625 |
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626 // validate bci/bcx |
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627 |
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628 intptr_t bcx = interpreter_frame_bcx(); |
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629 if (m->validate_bci_from_bcx(bcx) < 0) { |
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630 return false; |
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631 } |
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632 |
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633 // validate constantPoolCacheOop |
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634 |
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635 constantPoolCacheOop cp = *interpreter_frame_cache_addr(); |
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636 |
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637 if (cp == NULL || |
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638 !Space::is_aligned(cp) || |
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639 !Universe::heap()->is_permanent((void*)cp)) return false; |
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640 |
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641 // validate locals |
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642 |
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643 address locals = (address) *interpreter_frame_locals_addr(); |
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644 |
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645 if (locals > thread->stack_base() || locals < (address) fp()) return false; |
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646 |
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647 // We'd have to be pretty unlucky to be mislead at this point |
| 0 | 648 #endif /* CC_INTERP */ |
| 649 return true; | |
| 650 } | |
| 651 | |
| 652 | |
| 653 // Windows have been flushed on entry (but not marked). Capture the pc that | |
| 654 // is the return address to the frame that contains "sp" as its stack pointer. | |
| 655 // This pc resides in the called of the frame corresponding to "sp". | |
| 656 // As a side effect we mark this JavaFrameAnchor as having flushed the windows. | |
| 657 // This side effect lets us mark stacked JavaFrameAnchors (stacked in the | |
| 658 // call_helper) as flushed when we have flushed the windows for the most | |
| 659 // recent (i.e. current) JavaFrameAnchor. This saves useless flushing calls | |
| 660 // and lets us find the pc just once rather than multiple times as it did | |
| 661 // in the bad old _post_Java_state days. | |
| 662 // | |
| 663 void JavaFrameAnchor::capture_last_Java_pc(intptr_t* sp) { | |
| 664 if (last_Java_sp() != NULL && last_Java_pc() == NULL) { | |
| 665 // try and find the sp just younger than _last_Java_sp | |
| 666 intptr_t* _post_Java_sp = frame::next_younger_sp_or_null(last_Java_sp(), sp); | |
| 667 // Really this should never fail otherwise VM call must have non-standard | |
| 668 // frame linkage (bad) or stack is not properly flushed (worse). | |
| 669 guarantee(_post_Java_sp != NULL, "bad stack!"); | |
| 670 _last_Java_pc = (address) _post_Java_sp[ I7->sp_offset_in_saved_window()] + frame::pc_return_offset; | |
| 671 | |
| 672 } | |
| 673 set_window_flushed(); | |
| 674 } | |
| 675 | |
| 676 void JavaFrameAnchor::make_walkable(JavaThread* thread) { | |
| 677 if (walkable()) return; | |
| 678 // Eventually make an assert | |
| 679 guarantee(Thread::current() == (Thread*)thread, "only current thread can flush its registers"); | |
| 680 // We always flush in case the profiler wants it but we won't mark | |
| 681 // the windows as flushed unless we have a last_Java_frame | |
| 682 intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()(); | |
| 683 if (last_Java_sp() != NULL ) { | |
| 684 capture_last_Java_pc(sp); | |
| 685 } | |
| 686 } | |
| 687 | |
| 688 intptr_t* frame::entry_frame_argument_at(int offset) const { | |
| 689 // convert offset to index to deal with tsi | |
| 690 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize); | |
| 691 | |
| 692 intptr_t* LSP = (intptr_t*) sp()[Lentry_args->sp_offset_in_saved_window()]; | |
| 693 return &LSP[index+1]; | |
| 694 } | |
| 695 | |
| 696 | |
| 697 BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) { | |
| 698 assert(is_interpreted_frame(), "interpreted frame expected"); | |
| 699 methodOop method = interpreter_frame_method(); | |
| 700 BasicType type = method->result_type(); | |
| 701 | |
| 702 if (method->is_native()) { | |
| 703 // Prior to notifying the runtime of the method_exit the possible result | |
| 704 // value is saved to l_scratch and d_scratch. | |
| 705 | |
| 706 #ifdef CC_INTERP | |
| 707 interpreterState istate = get_interpreterState(); | |
| 708 intptr_t* l_scratch = (intptr_t*) &istate->_native_lresult; | |
| 709 intptr_t* d_scratch = (intptr_t*) &istate->_native_fresult; | |
| 710 #else /* CC_INTERP */ | |
| 711 intptr_t* l_scratch = fp() + interpreter_frame_l_scratch_fp_offset; | |
| 712 intptr_t* d_scratch = fp() + interpreter_frame_d_scratch_fp_offset; | |
| 713 #endif /* CC_INTERP */ | |
| 714 | |
| 715 address l_addr = (address)l_scratch; | |
| 716 #ifdef _LP64 | |
| 717 // On 64-bit the result for 1/8/16/32-bit result types is in the other | |
| 718 // word half | |
| 719 l_addr += wordSize/2; | |
| 720 #endif | |
| 721 | |
| 722 switch (type) { | |
| 723 case T_OBJECT: | |
| 724 case T_ARRAY: { | |
| 725 #ifdef CC_INTERP | |
| 726 *oop_result = istate->_oop_temp; | |
| 727 #else | |
| 728 oop obj = (oop) at(interpreter_frame_oop_temp_offset); | |
| 729 assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check"); | |
| 730 *oop_result = obj; | |
| 731 #endif // CC_INTERP | |
| 732 break; | |
| 733 } | |
| 734 | |
| 735 case T_BOOLEAN : { jint* p = (jint*)l_addr; value_result->z = (jboolean)((*p) & 0x1); break; } | |
| 736 case T_BYTE : { jint* p = (jint*)l_addr; value_result->b = (jbyte)((*p) & 0xff); break; } | |
| 737 case T_CHAR : { jint* p = (jint*)l_addr; value_result->c = (jchar)((*p) & 0xffff); break; } | |
| 738 case T_SHORT : { jint* p = (jint*)l_addr; value_result->s = (jshort)((*p) & 0xffff); break; } | |
| 739 case T_INT : value_result->i = *(jint*)l_addr; break; | |
| 740 case T_LONG : value_result->j = *(jlong*)l_scratch; break; | |
| 741 case T_FLOAT : value_result->f = *(jfloat*)d_scratch; break; | |
| 742 case T_DOUBLE : value_result->d = *(jdouble*)d_scratch; break; | |
| 743 case T_VOID : /* Nothing to do */ break; | |
| 744 default : ShouldNotReachHere(); | |
| 745 } | |
| 746 } else { | |
| 747 intptr_t* tos_addr = interpreter_frame_tos_address(); | |
| 748 | |
| 749 switch(type) { | |
| 750 case T_OBJECT: | |
| 751 case T_ARRAY: { | |
| 752 oop obj = (oop)*tos_addr; | |
| 753 assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check"); | |
| 754 *oop_result = obj; | |
| 755 break; | |
| 756 } | |
| 757 case T_BOOLEAN : { jint* p = (jint*)tos_addr; value_result->z = (jboolean)((*p) & 0x1); break; } | |
| 758 case T_BYTE : { jint* p = (jint*)tos_addr; value_result->b = (jbyte)((*p) & 0xff); break; } | |
| 759 case T_CHAR : { jint* p = (jint*)tos_addr; value_result->c = (jchar)((*p) & 0xffff); break; } | |
| 760 case T_SHORT : { jint* p = (jint*)tos_addr; value_result->s = (jshort)((*p) & 0xffff); break; } | |
| 761 case T_INT : value_result->i = *(jint*)tos_addr; break; | |
| 762 case T_LONG : value_result->j = *(jlong*)tos_addr; break; | |
| 763 case T_FLOAT : value_result->f = *(jfloat*)tos_addr; break; | |
| 764 case T_DOUBLE : value_result->d = *(jdouble*)tos_addr; break; | |
| 765 case T_VOID : /* Nothing to do */ break; | |
| 766 default : ShouldNotReachHere(); | |
| 767 } | |
| 768 }; | |
| 769 | |
| 770 return type; | |
| 771 } | |
| 772 | |
| 773 // Lesp pointer is one word lower than the top item on the stack. | |
| 774 intptr_t* frame::interpreter_frame_tos_at(jint offset) const { | |
| 775 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize) - 1; | |
| 776 return &interpreter_frame_tos_address()[index]; | |
| 777 } |