Mercurial > hg > truffle
annotate src/share/vm/interpreter/interpreter.hpp @ 20543:e7d0505c8a30
8059758: Footprint regressions with JDK-8038423
Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything.
Reviewed-by: jwilhelm, brutisso
| author | tschatzl |
|---|---|
| date | Fri, 10 Oct 2014 15:51:58 +0200 |
| parents | 094cbdffa87d |
| children | 7848fc12602b |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2013, 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 #ifndef SHARE_VM_INTERPRETER_INTERPRETER_HPP |
| 26 #define SHARE_VM_INTERPRETER_INTERPRETER_HPP | |
| 27 | |
| 28 #include "code/stubs.hpp" | |
| 29 #include "interpreter/cppInterpreter.hpp" | |
| 30 #include "interpreter/templateInterpreter.hpp" | |
| 31 #ifdef ZERO | |
| 32 #ifdef TARGET_ARCH_zero | |
| 33 # include "entry_zero.hpp" | |
| 34 #endif | |
| 35 #endif | |
| 36 | |
| 605 | 37 // This file contains the platform-independent parts |
| 0 | 38 // of the interpreter and the interpreter generator. |
| 39 | |
| 40 //------------------------------------------------------------------------------------------------------------------------ | |
| 41 // An InterpreterCodelet is a piece of interpreter code. All | |
| 42 // interpreter code is generated into little codelets which | |
| 43 // contain extra information for debugging and printing purposes. | |
| 44 | |
| 45 class InterpreterCodelet: public Stub { | |
| 46 friend class VMStructs; | |
| 47 private: | |
| 48 int _size; // the size in bytes | |
| 49 const char* _description; // a description of the codelet, for debugging & printing | |
| 50 Bytecodes::Code _bytecode; // associated bytecode if any | |
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51 DEBUG_ONLY(CodeStrings _strings;) // Comments for annotating assembler output. |
| 0 | 52 |
| 53 public: | |
| 54 // Initialization/finalization | |
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55 void initialize(int size, |
| 20435 | 56 CodeStrings& strings) { _size = size; |
| 57 DEBUG_ONLY(::new(&_strings) CodeStrings();) | |
| 58 DEBUG_ONLY(_strings.assign(strings);) } | |
| 0 | 59 void finalize() { ShouldNotCallThis(); } |
| 60 | |
| 61 // General info/converters | |
| 62 int size() const { return _size; } | |
| 63 static int code_size_to_size(int code_size) { return round_to(sizeof(InterpreterCodelet), CodeEntryAlignment) + code_size; } | |
| 64 | |
| 65 // Code info | |
| 66 address code_begin() const { return (address)this + round_to(sizeof(InterpreterCodelet), CodeEntryAlignment); } | |
| 67 address code_end() const { return (address)this + size(); } | |
| 68 | |
| 69 // Debugging | |
| 70 void verify(); | |
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71 void print_on(outputStream* st) const; |
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72 void print() const { print_on(tty); } |
| 0 | 73 |
| 74 // Interpreter-specific initialization | |
| 75 void initialize(const char* description, Bytecodes::Code bytecode); | |
| 76 | |
| 77 // Interpreter-specific attributes | |
| 78 int code_size() const { return code_end() - code_begin(); } | |
| 79 const char* description() const { return _description; } | |
| 80 Bytecodes::Code bytecode() const { return _bytecode; } | |
| 81 }; | |
| 82 | |
| 83 // Define a prototype interface | |
| 84 DEF_STUB_INTERFACE(InterpreterCodelet); | |
| 85 | |
| 86 | |
| 87 //------------------------------------------------------------------------------------------------------------------------ | |
| 88 // A CodeletMark serves as an automatic creator/initializer for Codelets | |
| 89 // (As a subclass of ResourceMark it automatically GC's the allocated | |
| 90 // code buffer and assemblers). | |
| 91 | |
| 92 class CodeletMark: ResourceMark { | |
| 93 private: | |
| 94 InterpreterCodelet* _clet; | |
| 95 InterpreterMacroAssembler** _masm; | |
| 96 CodeBuffer _cb; | |
| 97 | |
| 98 int codelet_size() { | |
| 99 // Request the whole code buffer (minus a little for alignment). | |
| 100 // The commit call below trims it back for each codelet. | |
| 101 int codelet_size = AbstractInterpreter::code()->available_space() - 2*K; | |
| 102 | |
| 103 // Guarantee there's a little bit of code space left. | |
| 104 guarantee (codelet_size > 0 && (size_t)codelet_size > 2*K, | |
| 105 "not enough space for interpreter generation"); | |
| 106 | |
| 107 return codelet_size; | |
| 108 } | |
| 109 | |
| 110 public: | |
| 111 CodeletMark( | |
| 112 InterpreterMacroAssembler*& masm, | |
| 113 const char* description, | |
| 114 Bytecodes::Code bytecode = Bytecodes::_illegal): | |
| 115 _clet((InterpreterCodelet*)AbstractInterpreter::code()->request(codelet_size())), | |
| 116 _cb(_clet->code_begin(), _clet->code_size()) | |
| 117 | |
| 118 { // request all space (add some slack for Codelet data) | |
| 119 assert (_clet != NULL, "we checked not enough space already"); | |
| 120 | |
| 121 // initialize Codelet attributes | |
| 122 _clet->initialize(description, bytecode); | |
| 123 // create assembler for code generation | |
| 124 masm = new InterpreterMacroAssembler(&_cb); | |
| 125 _masm = &masm; | |
| 126 } | |
| 127 | |
| 128 ~CodeletMark() { | |
| 129 // align so printing shows nop's instead of random code at the end (Codelets are aligned) | |
| 130 (*_masm)->align(wordSize); | |
| 131 // make sure all code is in code buffer | |
| 132 (*_masm)->flush(); | |
| 133 | |
| 134 | |
| 135 // commit Codelet | |
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136 AbstractInterpreter::code()->commit((*_masm)->code()->pure_insts_size(), (*_masm)->code()->strings()); |
| 0 | 137 // make sure nobody can use _masm outside a CodeletMark lifespan |
| 138 *_masm = NULL; | |
| 139 } | |
| 140 }; | |
| 141 | |
| 142 // Wrapper classes to produce Interpreter/InterpreterGenerator from either | |
| 143 // the c++ interpreter or the template interpreter. | |
| 144 | |
| 145 class Interpreter: public CC_INTERP_ONLY(CppInterpreter) NOT_CC_INTERP(TemplateInterpreter) { | |
| 146 | |
| 147 public: | |
| 148 // Debugging/printing | |
| 149 static InterpreterCodelet* codelet_containing(address pc) { return (InterpreterCodelet*)_code->stub_containing(pc); } | |
| 1972 | 150 #ifdef TARGET_ARCH_x86 |
| 151 # include "interpreter_x86.hpp" | |
| 152 #endif | |
| 153 #ifdef TARGET_ARCH_sparc | |
| 154 # include "interpreter_sparc.hpp" | |
| 155 #endif | |
| 156 #ifdef TARGET_ARCH_zero | |
| 157 # include "interpreter_zero.hpp" | |
| 158 #endif | |
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159 #ifdef TARGET_ARCH_arm |
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160 # include "interpreter_arm.hpp" |
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161 #endif |
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162 #ifdef TARGET_ARCH_ppc |
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163 # include "interpreter_ppc.hpp" |
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164 #endif |
| 1972 | 165 |
| 0 | 166 }; |
| 1972 | 167 |
| 168 #endif // SHARE_VM_INTERPRETER_INTERPRETER_HPP |