Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/prims/methodComparator.hpp
src/share/vm/prims/methodComparator.hpp
- changeset 4037
- da91efe96a93
- parent 2314
- f95d63e2154a
- child 6876
- 710a3c8b516e
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| 4036:36d1d483d5d6 | 4037:da91efe96a93 |
|---|---|
| 1 /* | 1 /* |
| 2 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. | 2 * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved. |
| 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | 4 * |
| 5 * This code is free software; you can redistribute it and/or modify it | 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 | 6 * under the terms of the GNU General Public License version 2 only, as |
| 7 * published by the Free Software Foundation. | 7 * published by the Free Software Foundation. |
| 24 | 24 |
| 25 #ifndef SHARE_VM_PRIMS_METHODCOMPARATOR_HPP | 25 #ifndef SHARE_VM_PRIMS_METHODCOMPARATOR_HPP |
| 26 #define SHARE_VM_PRIMS_METHODCOMPARATOR_HPP | 26 #define SHARE_VM_PRIMS_METHODCOMPARATOR_HPP |
| 27 | 27 |
| 28 #include "interpreter/bytecodeStream.hpp" | 28 #include "interpreter/bytecodeStream.hpp" |
| 29 #include "oops/constantPoolOop.hpp" | 29 #include "oops/constantPool.hpp" |
| 30 #include "oops/methodOop.hpp" | 30 #include "oops/method.hpp" |
| 31 | 31 |
| 32 class BciMap; | 32 class BciMap; |
| 33 | 33 |
| 34 // methodComparator provides an interface for determining if methods of | 34 // methodComparator provides an interface for determining if methods of |
| 35 // different versions of classes are equivalent or switchable | 35 // different versions of classes are equivalent or switchable |
| 36 | 36 |
| 37 class MethodComparator { | 37 class MethodComparator { |
| 38 private: | 38 private: |
| 39 static BytecodeStream *_s_old, *_s_new; | 39 static BytecodeStream *_s_old, *_s_new; |
| 40 static constantPoolOop _old_cp, _new_cp; | 40 static ConstantPool* _old_cp; |
| 41 static ConstantPool* _new_cp; | |
| 41 static BciMap *_bci_map; | 42 static BciMap *_bci_map; |
| 42 static bool _switchable_test; | 43 static bool _switchable_test; |
| 43 static GrowableArray<int> *_fwd_jmps; | 44 static GrowableArray<int> *_fwd_jmps; |
| 44 | 45 |
| 45 static bool args_same(Bytecodes::Code c_old, Bytecodes::Code c_new); | 46 static bool args_same(Bytecodes::Code c_old, Bytecodes::Code c_new); |
| 46 static bool pool_constants_same(int cpi_old, int cpi_new); | 47 static bool pool_constants_same(int cpi_old, int cpi_new); |
| 47 static int check_stack_and_locals_size(methodOop old_method, methodOop new_method); | 48 static int check_stack_and_locals_size(Method* old_method, Method* new_method); |
| 48 | 49 |
| 49 public: | 50 public: |
| 50 // Check if the new method is equivalent to the old one modulo constant pool (EMCP). | 51 // Check if the new method is equivalent to the old one modulo constant pool (EMCP). |
| 51 // Intuitive definition: two versions of the same method are EMCP, if they don't differ | 52 // Intuitive definition: two versions of the same method are EMCP, if they don't differ |
| 52 // on the source code level. Practically, we check whether the only difference between | 53 // on the source code level. Practically, we check whether the only difference between |
| 53 // method versions is some constantpool indices embedded into the bytecodes, and whether | 54 // method versions is some constantpool indices embedded into the bytecodes, and whether |
| 54 // these indices eventually point to the same constants for both method versions. | 55 // these indices eventually point to the same constants for both method versions. |
| 55 static bool methods_EMCP(methodOop old_method, methodOop new_method); | 56 static bool methods_EMCP(Method* old_method, Method* new_method); |
| 56 | 57 |
| 57 static bool methods_switchable(methodOop old_method, methodOop new_method, BciMap &bci_map); | 58 static bool methods_switchable(Method* old_method, Method* new_method, BciMap &bci_map); |
| 58 }; | 59 }; |
| 59 | 60 |
| 60 | 61 |
| 61 // ByteCode Index Map. For two versions of the same method, where the new version may contain | 62 // ByteCode Index Map. For two versions of the same method, where the new version may contain |
| 62 // fragments not found in the old version, provides a mapping from an index of a bytecode in | 63 // fragments not found in the old version, provides a mapping from an index of a bytecode in |
