Mercurial > hg > truffle
annotate src/cpu/x86/vm/runtime_x86_32.cpp @ 20304:a22acf6d7598
8048112: G1 Full GC needs to support the case when the very first region is not available
Summary: Refactor preparation for compaction during Full GC so that it lazily initializes the first compaction point. This also avoids problems later when the first region may not be committed. Also reviewed by K. Barrett.
Reviewed-by: brutisso
| author | tschatzl |
|---|---|
| date | Mon, 21 Jul 2014 10:00:31 +0200 |
| parents | cd3d6a6b95d9 |
| children |
| rev | line source |
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| 0 | 1 /* |
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2 * Copyright (c) 1998, 2011, 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 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #ifdef COMPILER2 | |
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27 #include "asm/macroAssembler.hpp" |
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28 #include "asm/macroAssembler.inline.hpp" |
| 1972 | 29 #include "classfile/systemDictionary.hpp" |
| 30 #include "code/vmreg.hpp" | |
| 31 #include "interpreter/interpreter.hpp" | |
| 32 #include "opto/runtime.hpp" | |
| 33 #include "runtime/interfaceSupport.hpp" | |
| 34 #include "runtime/sharedRuntime.hpp" | |
| 35 #include "runtime/stubRoutines.hpp" | |
| 36 #include "runtime/vframeArray.hpp" | |
| 37 #include "utilities/globalDefinitions.hpp" | |
| 38 #include "vmreg_x86.inline.hpp" | |
| 39 #endif | |
| 0 | 40 |
| 41 | |
| 42 #define __ masm-> | |
| 43 | |
| 44 //------------------------------generate_exception_blob--------------------------- | |
| 45 // creates exception blob at the end | |
| 46 // Using exception blob, this code is jumped from a compiled method. | |
| 47 // | |
| 48 // Given an exception pc at a call we call into the runtime for the | |
| 49 // handler in this method. This handler might merely restore state | |
| 50 // (i.e. callee save registers) unwind the frame and jump to the | |
| 51 // exception handler for the nmethod if there is no Java level handler | |
| 52 // for the nmethod. | |
| 53 // | |
| 54 // This code is entered with a jmp. | |
| 55 // | |
| 56 // Arguments: | |
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57 // rax: exception oop |
| 0 | 58 // rdx: exception pc |
| 59 // | |
| 60 // Results: | |
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61 // rax: exception oop |
| 0 | 62 // rdx: exception pc in caller or ??? |
| 63 // destination: exception handler of caller | |
| 64 // | |
| 65 // Note: the exception pc MUST be at a call (precise debug information) | |
| 66 // Only register rax, rdx, rcx are not callee saved. | |
| 67 // | |
| 68 | |
| 69 void OptoRuntime::generate_exception_blob() { | |
| 70 | |
| 71 // Capture info about frame layout | |
| 72 enum layout { | |
| 73 thread_off, // last_java_sp | |
| 74 // The frame sender code expects that rbp will be in the "natural" place and | |
| 75 // will override any oopMap setting for it. We must therefore force the layout | |
| 76 // so that it agrees with the frame sender code. | |
| 77 rbp_off, | |
| 78 return_off, // slot for return address | |
| 79 framesize | |
| 80 }; | |
| 81 | |
| 82 // allocate space for the code | |
| 83 ResourceMark rm; | |
| 84 // setup code generation tools | |
| 85 CodeBuffer buffer("exception_blob", 512, 512); | |
| 86 MacroAssembler* masm = new MacroAssembler(&buffer); | |
| 87 | |
| 88 OopMapSet *oop_maps = new OopMapSet(); | |
| 89 | |
| 90 address start = __ pc(); | |
| 91 | |
| 304 | 92 __ push(rdx); |
| 93 __ subptr(rsp, return_off * wordSize); // Prolog! | |
| 0 | 94 |
| 95 // rbp, location is implicitly known | |
| 304 | 96 __ movptr(Address(rsp,rbp_off *wordSize), rbp); |
| 0 | 97 |
| 98 // Store exception in Thread object. We cannot pass any arguments to the | |
| 99 // handle_exception call, since we do not want to make any assumption | |
| 100 // about the size of the frame where the exception happened in. | |
| 101 __ get_thread(rcx); | |
| 304 | 102 __ movptr(Address(rcx, JavaThread::exception_oop_offset()), rax); |
| 103 __ movptr(Address(rcx, JavaThread::exception_pc_offset()), rdx); | |
| 0 | 104 |
| 105 // This call does all the hard work. It checks if an exception handler | |
| 106 // exists in the method. | |
| 107 // If so, it returns the handler address. | |
| 108 // If not, it prepares for stack-unwinding, restoring the callee-save | |
| 109 // registers of the frame being removed. | |
| 110 // | |
| 304 | 111 __ movptr(Address(rsp, thread_off * wordSize), rcx); // Thread is first argument |
| 0 | 112 __ set_last_Java_frame(rcx, noreg, noreg, NULL); |
| 113 | |
| 114 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C))); | |
| 115 | |
| 116 // No registers to map, rbp is known implicitly | |
| 117 oop_maps->add_gc_map( __ pc() - start, new OopMap( framesize, 0 )); | |
| 118 __ get_thread(rcx); | |
| 119 __ reset_last_Java_frame(rcx, false, false); | |
| 120 | |
| 121 // Restore callee-saved registers | |
| 304 | 122 __ movptr(rbp, Address(rsp, rbp_off * wordSize)); |
| 0 | 123 |
| 304 | 124 __ addptr(rsp, return_off * wordSize); // Epilog! |
| 125 __ pop(rdx); // Exception pc | |
| 0 | 126 |
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127 // rax: exception handler for given <exception oop/exception pc> |
| 0 | 128 |
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129 // Restore SP from BP if the exception PC is a MethodHandle call site. |
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130 __ cmpl(Address(rcx, JavaThread::is_method_handle_return_offset()), 0); |
| 1567 | 131 __ cmovptr(Assembler::notEqual, rsp, rbp_mh_SP_save); |
| 0 | 132 |
| 133 // We have a handler in rax, (could be deopt blob) | |
| 134 // rdx - throwing pc, deopt blob will need it. | |
| 135 | |
| 304 | 136 __ push(rax); |
| 0 | 137 |
| 138 // Get the exception | |
| 304 | 139 __ movptr(rax, Address(rcx, JavaThread::exception_oop_offset())); |
| 0 | 140 // Get the exception pc in case we are deoptimized |
| 304 | 141 __ movptr(rdx, Address(rcx, JavaThread::exception_pc_offset())); |
| 0 | 142 #ifdef ASSERT |
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143 __ movptr(Address(rcx, JavaThread::exception_handler_pc_offset()), NULL_WORD); |
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144 __ movptr(Address(rcx, JavaThread::exception_pc_offset()), NULL_WORD); |
| 0 | 145 #endif |
| 146 // Clear the exception oop so GC no longer processes it as a root. | |
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147 __ movptr(Address(rcx, JavaThread::exception_oop_offset()), NULL_WORD); |
| 0 | 148 |
| 304 | 149 __ pop(rcx); |
| 0 | 150 |
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151 // rax: exception oop |
| 0 | 152 // rcx: exception handler |
| 153 // rdx: exception pc | |
| 154 __ jmp (rcx); | |
| 155 | |
| 156 // ------------- | |
| 157 // make sure all code is generated | |
| 158 masm->flush(); | |
| 159 | |
| 160 _exception_blob = ExceptionBlob::create(&buffer, oop_maps, framesize); | |
| 161 } |