1 /* 2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2012, 2014 SAP SE. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #include "precompiled.hpp" 27 #include "runtime/frame.inline.hpp" 28 #include "runtime/thread.hpp" 29 30 frame JavaThread::pd_last_frame() { 31 assert(has_last_Java_frame(), "must have last_Java_sp() when suspended"); 32 33 intptr_t* sp = last_Java_sp(); 34 address pc = _anchor.last_Java_pc(); 35 36 // Last_Java_pc ist not set, if we come here from compiled code. 37 if (pc == NULL) { 38 pc = (address) *(sp + 2); 39 } 40 41 return frame(sp, pc); 42 } 43 44 bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) { 45 assert(this->is_Java_thread(), "must be JavaThread"); 46 47 // If we have a last_Java_frame, then we should use it even if 48 // isInJava == true. It should be more reliable than ucontext info. 49 if (has_last_Java_frame() && frame_anchor()->walkable()) { 50 *fr_addr = pd_last_frame(); 51 return true; 52 } 53 54 // At this point, we don't have a last_Java_frame, so 55 // we try to glean some information out of the ucontext 56 // if we were running Java code when SIGPROF came in. 57 if (isInJava) { 58 ucontext_t* uc = (ucontext_t*) ucontext; 59 frame ret_frame((intptr_t*)uc->uc_mcontext.regs->gpr[1/*REG_SP*/], 60 (address)uc->uc_mcontext.regs->nip); 61 62 if (ret_frame.pc() == NULL) { 63 // ucontext wasn't useful 64 return false; 65 } 66 67 if (ret_frame.is_interpreted_frame()) { 68 frame::ijava_state* istate = ret_frame.get_ijava_state(); 69 if (!((Method*)(istate->method))->is_metaspace_object()) { 70 return false; 71 } 72 uint64_t reg_bcp = uc->uc_mcontext.regs->gpr[14/*R14_bcp*/]; 73 uint64_t istate_bcp = istate->bcp; 74 uint64_t code_start = (uint64_t)(((Method*)(istate->method))->code_base()); 75 uint64_t code_end = (uint64_t)(((Method*)istate->method)->code_base() + ((Method*)istate->method)->code_size()); 76 if (istate_bcp >= code_start && istate_bcp < code_end) { 77 // we have a valid bcp, don't touch it, do nothing 78 } else if (reg_bcp >= code_start && reg_bcp < code_end) { 79 istate->bcp = reg_bcp; 80 } else { 81 return false; 82 } 83 } 84 if (!ret_frame.safe_for_sender(this)) { 85 // nothing else to try if the frame isn't good 86 return false; 87 } 88 *fr_addr = ret_frame; 89 return true; 90 } 91 // nothing else to try 92 return false; 93 } 94 95 // Forte Analyzer AsyncGetCallTrace profiling support is not implemented on Linux/PPC. 96 bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, void* ucontext, bool isInJava) { 97 Unimplemented(); 98 return false; 99 } 100 101 void JavaThread::cache_global_variables() { }