Mercurial > hg > truffle
annotate src/cpu/sparc/vm/frame_sparc.cpp @ 1579:e9ff18c4ace7
Merge
author | jrose |
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date | Wed, 02 Jun 2010 22:45:42 -0700 |
parents | c18cbe5936b8 61b2245abf36 |
children | 3e8fbc61cee8 |
rev | line source |
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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_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 | |
107
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160 bool frame::safe_for_sender(JavaThread *thread) { |
0 | 161 |
107
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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 } |
107
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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 } |
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 | |
1564 | 339 frame::frame(intptr_t* sp, intptr_t* younger_sp, bool younger_frame_is_interpreted) : |
340 _sp(sp), | |
341 _younger_sp(younger_sp), | |
342 _deopt_state(unknown), | |
343 _sp_adjustment_by_callee(0) { | |
0 | 344 if (younger_sp == NULL) { |
345 // make a deficient frame which doesn't know where its PC is | |
346 _pc = NULL; | |
347 _cb = NULL; | |
348 } else { | |
349 _pc = (address)younger_sp[I7->sp_offset_in_saved_window()] + pc_return_offset; | |
350 assert( (intptr_t*)younger_sp[FP->sp_offset_in_saved_window()] == (intptr_t*)((intptr_t)sp - STACK_BIAS), "younger_sp must be valid"); | |
351 // Any frame we ever build should always "safe" therefore we should not have to call | |
352 // find_blob_unsafe | |
353 // In case of native stubs, the pc retrieved here might be | |
354 // wrong. (the _last_native_pc will have the right value) | |
355 // So do not put add any asserts on the _pc here. | |
356 } | |
1564 | 357 |
358 if (_pc != NULL) | |
359 _cb = CodeCache::find_blob(_pc); | |
360 | |
361 // Check for MethodHandle call sites. | |
362 if (_cb != NULL) { | |
363 nmethod* nm = _cb->as_nmethod_or_null(); | |
364 if (nm != NULL) { | |
365 if (nm->is_deopt_mh_entry(_pc) || nm->is_method_handle_return(_pc)) { | |
366 _sp_adjustment_by_callee = (intptr_t*) ((intptr_t) sp[L7_mh_SP_save->sp_offset_in_saved_window()] + STACK_BIAS) - sp; | |
367 // The SP is already adjusted by this MH call site, don't | |
368 // overwrite this value with the wrong interpreter value. | |
369 younger_frame_is_interpreted = false; | |
370 } | |
371 } | |
0 | 372 } |
373 | |
1564 | 374 if (younger_frame_is_interpreted) { |
375 // compute adjustment to this frame's SP made by its interpreted callee | |
376 _sp_adjustment_by_callee = (intptr_t*) ((intptr_t) younger_sp[I5_savedSP->sp_offset_in_saved_window()] + STACK_BIAS) - sp; | |
377 } | |
0 | 378 |
1564 | 379 // It is important that the frame is fully constructed when we do |
380 // this lookup as get_deopt_original_pc() needs a correct value for | |
381 // unextended_sp() which uses _sp_adjustment_by_callee. | |
0 | 382 if (_pc != NULL) { |
1204 | 383 address original_pc = nmethod::get_deopt_original_pc(this); |
384 if (original_pc != NULL) { | |
385 _pc = original_pc; | |
0 | 386 _deopt_state = is_deoptimized; |
387 } else { | |
388 _deopt_state = not_deoptimized; | |
389 } | |
390 } | |
391 } | |
392 | |
393 bool frame::is_interpreted_frame() const { | |
394 return Interpreter::contains(pc()); | |
395 } | |
396 | |
397 // sender_sp | |
398 | |
399 intptr_t* frame::interpreter_frame_sender_sp() const { | |
400 assert(is_interpreted_frame(), "interpreted frame expected"); | |
401 return fp(); | |
402 } | |
403 | |
404 #ifndef CC_INTERP | |
405 void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) { | |
406 assert(is_interpreted_frame(), "interpreted frame expected"); | |
407 Unimplemented(); | |
408 } | |
409 #endif // CC_INTERP | |
410 | |
411 | |
412 #ifdef ASSERT | |
413 // Debugging aid | |
414 static frame nth_sender(int n) { | |
415 frame f = JavaThread::current()->last_frame(); | |
416 | |
417 for(int i = 0; i < n; ++i) | |
418 f = f.sender((RegisterMap*)NULL); | |
419 | |
420 printf("first frame %d\n", f.is_first_frame() ? 1 : 0); | |
421 printf("interpreted frame %d\n", f.is_interpreted_frame() ? 1 : 0); | |
422 printf("java frame %d\n", f.is_java_frame() ? 1 : 0); | |
423 printf("entry frame %d\n", f.is_entry_frame() ? 1 : 0); | |
424 printf("native frame %d\n", f.is_native_frame() ? 1 : 0); | |
425 if (f.is_compiled_frame()) { | |
426 if (f.is_deoptimized_frame()) | |
427 printf("deoptimized frame 1\n"); | |
428 else | |
429 printf("compiled frame 1\n"); | |
430 } | |
431 | |
432 return f; | |
433 } | |
434 #endif | |
435 | |
436 | |
437 frame frame::sender_for_entry_frame(RegisterMap *map) const { | |
438 assert(map != NULL, "map must be set"); | |
439 // Java frame called from C; skip all C frames and return top C | |
440 // frame of that chunk as the sender | |
441 JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor(); | |
442 assert(!entry_frame_is_first(), "next Java fp must be non zero"); | |
443 assert(jfa->last_Java_sp() > _sp, "must be above this frame on stack"); | |
444 intptr_t* last_Java_sp = jfa->last_Java_sp(); | |
445 // Since we are walking the stack now this nested anchor is obviously walkable | |
446 // even if it wasn't when it was stacked. | |
447 if (!jfa->walkable()) { | |
448 // Capture _last_Java_pc (if needed) and mark anchor walkable. | |
449 jfa->capture_last_Java_pc(_sp); | |
450 } | |
451 assert(jfa->last_Java_pc() != NULL, "No captured pc!"); | |
452 map->clear(); | |
453 map->make_integer_regs_unsaved(); | |
454 map->shift_window(last_Java_sp, NULL); | |
455 assert(map->include_argument_oops(), "should be set by clear"); | |
456 return frame(last_Java_sp, frame::unpatchable, jfa->last_Java_pc()); | |
457 } | |
458 | |
459 frame frame::sender_for_interpreter_frame(RegisterMap *map) const { | |
460 ShouldNotCallThis(); | |
461 return sender(map); | |
462 } | |
463 | |
464 frame frame::sender_for_compiled_frame(RegisterMap *map) const { | |
465 ShouldNotCallThis(); | |
466 return sender(map); | |
467 } | |
468 | |
469 frame frame::sender(RegisterMap* map) const { | |
470 assert(map != NULL, "map must be set"); | |
471 | |
472 assert(CodeCache::find_blob_unsafe(_pc) == _cb, "inconsistent"); | |
473 | |
474 // Default is not to follow arguments; update it accordingly below | |
475 map->set_include_argument_oops(false); | |
476 | |
477 if (is_entry_frame()) return sender_for_entry_frame(map); | |
478 | |
1564 | 479 intptr_t* younger_sp = sp(); |
480 intptr_t* sp = sender_sp(); | |
0 | 481 |
482 // Note: The version of this operation on any platform with callee-save | |
483 // registers must update the register map (if not null). | |
484 // In order to do this correctly, the various subtypes of | |
485 // of frame (interpreted, compiled, glue, native), | |
486 // must be distinguished. There is no need on SPARC for | |
487 // such distinctions, because all callee-save registers are | |
488 // preserved for all frames via SPARC-specific mechanisms. | |
489 // | |
490 // *** HOWEVER, *** if and when we make any floating-point | |
491 // registers callee-saved, then we will have to copy over | |
492 // the RegisterMap update logic from the Intel code. | |
493 | |
494 // The constructor of the sender must know whether this frame is interpreted so it can set the | |
495 // sender's _sp_adjustment_by_callee field. An osr adapter frame was originally | |
496 // interpreted but its pc is in the code cache (for c1 -> osr_frame_return_id stub), so it must be | |
497 // explicitly recognized. | |
498 | |
1564 | 499 bool frame_is_interpreted = is_interpreted_frame(); |
500 if (frame_is_interpreted) { | |
0 | 501 map->make_integer_regs_unsaved(); |
502 map->shift_window(sp, younger_sp); | |
503 } else if (_cb != NULL) { | |
504 // Update the locations of implicitly saved registers to be their | |
505 // addresses in the register save area. | |
506 // For %o registers, the addresses of %i registers in the next younger | |
507 // frame are used. | |
508 map->shift_window(sp, younger_sp); | |
509 if (map->update_map()) { | |
510 // Tell GC to use argument oopmaps for some runtime stubs that need it. | |
511 // For C1, the runtime stub might not have oop maps, so set this flag | |
512 // outside of update_register_map. | |
513 map->set_include_argument_oops(_cb->caller_must_gc_arguments(map->thread())); | |
514 if (_cb->oop_maps() != NULL) { | |
515 OopMapSet::update_register_map(this, map); | |
516 } | |
517 } | |
518 } | |
1564 | 519 return frame(sp, younger_sp, frame_is_interpreted); |
0 | 520 } |
521 | |
522 | |
523 void frame::patch_pc(Thread* thread, address pc) { | |
524 if(thread == Thread::current()) { | |
525 StubRoutines::Sparc::flush_callers_register_windows_func()(); | |
526 } | |
527 if (TracePcPatching) { | |
528 // QQQ this assert is invalid (or too strong anyway) sice _pc could | |
529 // be original pc and frame could have the deopt pc. | |
530 // assert(_pc == *O7_addr() + pc_return_offset, "frame has wrong pc"); | |
531 tty->print_cr("patch_pc at address 0x%x [0x%x -> 0x%x] ", O7_addr(), _pc, pc); | |
532 } | |
533 _cb = CodeCache::find_blob(pc); | |
534 *O7_addr() = pc - pc_return_offset; | |
535 _cb = CodeCache::find_blob(_pc); | |
1204 | 536 address original_pc = nmethod::get_deopt_original_pc(this); |
537 if (original_pc != NULL) { | |
538 assert(original_pc == _pc, "expected original to be stored before patching"); | |
0 | 539 _deopt_state = is_deoptimized; |
540 } else { | |
541 _deopt_state = not_deoptimized; | |
542 } | |
543 } | |
544 | |
545 | |
546 static bool sp_is_valid(intptr_t* old_sp, intptr_t* young_sp, intptr_t* sp) { | |
547 return (((intptr_t)sp & (2*wordSize-1)) == 0 && | |
548 sp <= old_sp && | |
549 sp >= young_sp); | |
550 } | |
551 | |
552 | |
553 /* | |
554 Find the (biased) sp that is just younger than old_sp starting at sp. | |
555 If not found return NULL. Register windows are assumed to be flushed. | |
556 */ | |
557 intptr_t* frame::next_younger_sp_or_null(intptr_t* old_sp, intptr_t* sp) { | |
558 | |
559 intptr_t* previous_sp = NULL; | |
560 intptr_t* orig_sp = sp; | |
561 | |
562 int max_frames = (old_sp - sp) / 16; // Minimum frame size is 16 | |
563 int max_frame2 = max_frames; | |
564 while(sp != old_sp && sp_is_valid(old_sp, orig_sp, sp)) { | |
565 if (max_frames-- <= 0) | |
566 // too many frames have gone by; invalid parameters given to this function | |
567 break; | |
568 previous_sp = sp; | |
569 sp = (intptr_t*)sp[FP->sp_offset_in_saved_window()]; | |
570 sp = (intptr_t*)((intptr_t)sp + STACK_BIAS); | |
571 } | |
572 | |
573 return (sp == old_sp ? previous_sp : NULL); | |
574 } | |
575 | |
576 /* | |
577 Determine if "sp" is a valid stack pointer. "sp" is assumed to be younger than | |
578 "valid_sp". So if "sp" is valid itself then it should be possible to walk frames | |
579 from "sp" to "valid_sp". The assumption is that the registers windows for the | |
580 thread stack in question are flushed. | |
581 */ | |
582 bool frame::is_valid_stack_pointer(intptr_t* valid_sp, intptr_t* sp) { | |
583 return next_younger_sp_or_null(valid_sp, sp) != NULL; | |
584 } | |
585 | |
586 | |
587 bool frame::interpreter_frame_equals_unpacked_fp(intptr_t* fp) { | |
588 assert(is_interpreted_frame(), "must be interpreter frame"); | |
589 return this->fp() == fp; | |
590 } | |
591 | |
592 | |
593 void frame::pd_gc_epilog() { | |
594 if (is_interpreted_frame()) { | |
595 // set constant pool cache entry for interpreter | |
596 methodOop m = interpreter_frame_method(); | |
597 | |
598 *interpreter_frame_cpoolcache_addr() = m->constants()->cache(); | |
599 } | |
600 } | |
601 | |
602 | |
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603 bool frame::is_interpreted_frame_valid(JavaThread* thread) const { |
0 | 604 #ifdef CC_INTERP |
605 // Is there anything to do? | |
606 #else | |
607 assert(is_interpreted_frame(), "Not an interpreted frame"); | |
608 // These are reasonable sanity checks | |
609 if (fp() == 0 || (intptr_t(fp()) & (2*wordSize-1)) != 0) { | |
610 return false; | |
611 } | |
612 if (sp() == 0 || (intptr_t(sp()) & (2*wordSize-1)) != 0) { | |
613 return false; | |
614 } | |
107
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615 |
0 | 616 const intptr_t interpreter_frame_initial_sp_offset = interpreter_frame_vm_local_words; |
617 if (fp() + interpreter_frame_initial_sp_offset < sp()) { | |
618 return false; | |
619 } | |
620 // These are hacks to keep us out of trouble. | |
621 // The problem with these is that they mask other problems | |
622 if (fp() <= sp()) { // this attempts to deal with unsigned comparison above | |
623 return false; | |
624 } | |
107
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625 // do some validation of frame elements |
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626 |
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627 // first the method |
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628 |
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629 methodOop m = *interpreter_frame_method_addr(); |
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630 |
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631 // validate the method we'd find in this potential sender |
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632 if (!Universe::heap()->is_valid_method(m)) return false; |
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633 |
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634 // stack frames shouldn't be much larger than max_stack elements |
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635 |
1506 | 636 if (fp() - sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) { |
0 | 637 return false; |
638 } | |
107
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639 |
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640 // validate bci/bcx |
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641 |
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642 intptr_t bcx = interpreter_frame_bcx(); |
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643 if (m->validate_bci_from_bcx(bcx) < 0) { |
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644 return false; |
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645 } |
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646 |
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647 // validate constantPoolCacheOop |
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648 |
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649 constantPoolCacheOop cp = *interpreter_frame_cache_addr(); |
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650 |
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651 if (cp == NULL || |
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652 !Space::is_aligned(cp) || |
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653 !Universe::heap()->is_permanent((void*)cp)) return false; |
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654 |
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655 // validate locals |
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656 |
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657 address locals = (address) *interpreter_frame_locals_addr(); |
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658 |
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659 if (locals > thread->stack_base() || locals < (address) fp()) return false; |
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660 |
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661 // We'd have to be pretty unlucky to be mislead at this point |
0 | 662 #endif /* CC_INTERP */ |
663 return true; | |
664 } | |
665 | |
666 | |
667 // Windows have been flushed on entry (but not marked). Capture the pc that | |
668 // is the return address to the frame that contains "sp" as its stack pointer. | |
669 // This pc resides in the called of the frame corresponding to "sp". | |
670 // As a side effect we mark this JavaFrameAnchor as having flushed the windows. | |
671 // This side effect lets us mark stacked JavaFrameAnchors (stacked in the | |
672 // call_helper) as flushed when we have flushed the windows for the most | |
673 // recent (i.e. current) JavaFrameAnchor. This saves useless flushing calls | |
674 // and lets us find the pc just once rather than multiple times as it did | |
675 // in the bad old _post_Java_state days. | |
676 // | |
677 void JavaFrameAnchor::capture_last_Java_pc(intptr_t* sp) { | |
678 if (last_Java_sp() != NULL && last_Java_pc() == NULL) { | |
679 // try and find the sp just younger than _last_Java_sp | |
680 intptr_t* _post_Java_sp = frame::next_younger_sp_or_null(last_Java_sp(), sp); | |
681 // Really this should never fail otherwise VM call must have non-standard | |
682 // frame linkage (bad) or stack is not properly flushed (worse). | |
683 guarantee(_post_Java_sp != NULL, "bad stack!"); | |
684 _last_Java_pc = (address) _post_Java_sp[ I7->sp_offset_in_saved_window()] + frame::pc_return_offset; | |
685 | |
686 } | |
687 set_window_flushed(); | |
688 } | |
689 | |
690 void JavaFrameAnchor::make_walkable(JavaThread* thread) { | |
691 if (walkable()) return; | |
692 // Eventually make an assert | |
693 guarantee(Thread::current() == (Thread*)thread, "only current thread can flush its registers"); | |
694 // We always flush in case the profiler wants it but we won't mark | |
695 // the windows as flushed unless we have a last_Java_frame | |
696 intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()(); | |
697 if (last_Java_sp() != NULL ) { | |
698 capture_last_Java_pc(sp); | |
699 } | |
700 } | |
701 | |
702 intptr_t* frame::entry_frame_argument_at(int offset) const { | |
703 // convert offset to index to deal with tsi | |
704 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize); | |
705 | |
706 intptr_t* LSP = (intptr_t*) sp()[Lentry_args->sp_offset_in_saved_window()]; | |
707 return &LSP[index+1]; | |
708 } | |
709 | |
710 | |
711 BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) { | |
712 assert(is_interpreted_frame(), "interpreted frame expected"); | |
713 methodOop method = interpreter_frame_method(); | |
714 BasicType type = method->result_type(); | |
715 | |
716 if (method->is_native()) { | |
717 // Prior to notifying the runtime of the method_exit the possible result | |
718 // value is saved to l_scratch and d_scratch. | |
719 | |
720 #ifdef CC_INTERP | |
721 interpreterState istate = get_interpreterState(); | |
722 intptr_t* l_scratch = (intptr_t*) &istate->_native_lresult; | |
723 intptr_t* d_scratch = (intptr_t*) &istate->_native_fresult; | |
724 #else /* CC_INTERP */ | |
725 intptr_t* l_scratch = fp() + interpreter_frame_l_scratch_fp_offset; | |
726 intptr_t* d_scratch = fp() + interpreter_frame_d_scratch_fp_offset; | |
727 #endif /* CC_INTERP */ | |
728 | |
729 address l_addr = (address)l_scratch; | |
730 #ifdef _LP64 | |
731 // On 64-bit the result for 1/8/16/32-bit result types is in the other | |
732 // word half | |
733 l_addr += wordSize/2; | |
734 #endif | |
735 | |
736 switch (type) { | |
737 case T_OBJECT: | |
738 case T_ARRAY: { | |
739 #ifdef CC_INTERP | |
740 *oop_result = istate->_oop_temp; | |
741 #else | |
742 oop obj = (oop) at(interpreter_frame_oop_temp_offset); | |
743 assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check"); | |
744 *oop_result = obj; | |
745 #endif // CC_INTERP | |
746 break; | |
747 } | |
748 | |
749 case T_BOOLEAN : { jint* p = (jint*)l_addr; value_result->z = (jboolean)((*p) & 0x1); break; } | |
750 case T_BYTE : { jint* p = (jint*)l_addr; value_result->b = (jbyte)((*p) & 0xff); break; } | |
751 case T_CHAR : { jint* p = (jint*)l_addr; value_result->c = (jchar)((*p) & 0xffff); break; } | |
752 case T_SHORT : { jint* p = (jint*)l_addr; value_result->s = (jshort)((*p) & 0xffff); break; } | |
753 case T_INT : value_result->i = *(jint*)l_addr; break; | |
754 case T_LONG : value_result->j = *(jlong*)l_scratch; break; | |
755 case T_FLOAT : value_result->f = *(jfloat*)d_scratch; break; | |
756 case T_DOUBLE : value_result->d = *(jdouble*)d_scratch; break; | |
757 case T_VOID : /* Nothing to do */ break; | |
758 default : ShouldNotReachHere(); | |
759 } | |
760 } else { | |
761 intptr_t* tos_addr = interpreter_frame_tos_address(); | |
762 | |
763 switch(type) { | |
764 case T_OBJECT: | |
765 case T_ARRAY: { | |
766 oop obj = (oop)*tos_addr; | |
767 assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check"); | |
768 *oop_result = obj; | |
769 break; | |
770 } | |
771 case T_BOOLEAN : { jint* p = (jint*)tos_addr; value_result->z = (jboolean)((*p) & 0x1); break; } | |
772 case T_BYTE : { jint* p = (jint*)tos_addr; value_result->b = (jbyte)((*p) & 0xff); break; } | |
773 case T_CHAR : { jint* p = (jint*)tos_addr; value_result->c = (jchar)((*p) & 0xffff); break; } | |
774 case T_SHORT : { jint* p = (jint*)tos_addr; value_result->s = (jshort)((*p) & 0xffff); break; } | |
775 case T_INT : value_result->i = *(jint*)tos_addr; break; | |
776 case T_LONG : value_result->j = *(jlong*)tos_addr; break; | |
777 case T_FLOAT : value_result->f = *(jfloat*)tos_addr; break; | |
778 case T_DOUBLE : value_result->d = *(jdouble*)tos_addr; break; | |
779 case T_VOID : /* Nothing to do */ break; | |
780 default : ShouldNotReachHere(); | |
781 } | |
782 }; | |
783 | |
784 return type; | |
785 } | |
786 | |
787 // Lesp pointer is one word lower than the top item on the stack. | |
788 intptr_t* frame::interpreter_frame_tos_at(jint offset) const { | |
789 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize) - 1; | |
790 return &interpreter_frame_tos_address()[index]; | |
791 } |