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annotate src/share/vm/runtime/jniHandles.hpp @ 18096:ca6d25be853b jdk8u25-b13
8044269: Analysis of archive files.
Summary: Add checksum verification.
Reviewed-by: iklam, dholmes, mschoene
| author | jiangli |
|---|---|
| date | Tue, 12 Aug 2014 17:46:16 -0400 |
| parents | da91efe96a93 |
| children | 63a4eb8bcd23 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1998, 2012, 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_RUNTIME_JNIHANDLES_HPP |
| 26 #define SHARE_VM_RUNTIME_JNIHANDLES_HPP | |
| 27 | |
| 28 #include "runtime/handles.hpp" | |
| 29 #include "utilities/top.hpp" | |
| 30 | |
| 0 | 31 class JNIHandleBlock; |
| 32 | |
| 33 | |
| 34 // Interface for creating and resolving local/global JNI handles | |
| 35 | |
| 36 class JNIHandles : AllStatic { | |
| 37 friend class VMStructs; | |
| 38 private: | |
| 39 static JNIHandleBlock* _global_handles; // First global handle block | |
| 40 static JNIHandleBlock* _weak_global_handles; // First weak global handle block | |
| 41 static oop _deleted_handle; // Sentinel marking deleted handles | |
| 42 | |
| 43 public: | |
| 44 // Resolve handle into oop | |
| 45 inline static oop resolve(jobject handle); | |
| 46 // Resolve externally provided handle into oop with some guards | |
| 47 inline static oop resolve_external_guard(jobject handle); | |
| 48 // Resolve handle into oop, result guaranteed not to be null | |
| 49 inline static oop resolve_non_null(jobject handle); | |
| 50 | |
| 51 // Local handles | |
| 52 static jobject make_local(oop obj); | |
| 53 static jobject make_local(JNIEnv* env, oop obj); // Fast version when env is known | |
| 54 static jobject make_local(Thread* thread, oop obj); // Even faster version when current thread is known | |
| 55 inline static void destroy_local(jobject handle); | |
| 56 | |
| 57 // Global handles | |
| 58 static jobject make_global(Handle obj); | |
| 59 static void destroy_global(jobject handle); | |
| 60 | |
| 61 // Weak global handles | |
| 62 static jobject make_weak_global(Handle obj); | |
| 63 static void destroy_weak_global(jobject handle); | |
| 64 | |
| 65 // Sentinel marking deleted handles in block. Note that we cannot store NULL as | |
| 66 // the sentinel, since clearing weak global JNI refs are done by storing NULL in | |
| 67 // the handle. The handle may not be reused before destroy_weak_global is called. | |
| 68 static oop deleted_handle() { return _deleted_handle; } | |
| 69 | |
| 70 // Initialization | |
| 71 static void initialize(); | |
| 72 | |
| 73 // Debugging | |
| 74 static void print_on(outputStream* st); | |
| 75 static void print() { print_on(tty); } | |
| 76 static void verify(); | |
| 77 static bool is_local_handle(Thread* thread, jobject handle); | |
| 78 static bool is_frame_handle(JavaThread* thr, jobject obj); | |
| 79 static bool is_global_handle(jobject handle); | |
| 80 static bool is_weak_global_handle(jobject handle); | |
| 81 static long global_handle_memory_usage(); | |
| 82 static long weak_global_handle_memory_usage(); | |
| 83 | |
| 84 // Garbage collection support(global handles only, local handles are traversed from thread) | |
| 85 // Traversal of regular global handles | |
| 86 static void oops_do(OopClosure* f); | |
| 87 // Traversal of weak global handles. Unreachable oops are cleared. | |
| 88 static void weak_oops_do(BoolObjectClosure* is_alive, OopClosure* f); | |
| 89 }; | |
| 90 | |
| 91 | |
| 92 | |
| 93 // JNI handle blocks holding local/global JNI handles | |
| 94 | |
| 6197 | 95 class JNIHandleBlock : public CHeapObj<mtInternal> { |
| 0 | 96 friend class VMStructs; |
| 1010 | 97 friend class CppInterpreter; |
| 98 | |
| 0 | 99 private: |
| 100 enum SomeConstants { | |
| 101 block_size_in_oops = 32 // Number of handles per handle block | |
| 102 }; | |
| 103 | |
| 104 oop _handles[block_size_in_oops]; // The handles | |
| 105 int _top; // Index of next unused handle | |
| 106 JNIHandleBlock* _next; // Link to next block | |
| 107 | |
| 108 // The following instance variables are only used by the first block in a chain. | |
| 109 // Having two types of blocks complicates the code and the space overhead in negligble. | |
| 110 JNIHandleBlock* _last; // Last block in use | |
| 111 JNIHandleBlock* _pop_frame_link; // Block to restore on PopLocalFrame call | |
| 112 oop* _free_list; // Handle free list | |
| 113 int _allocate_before_rebuild; // Number of blocks to allocate before rebuilding free list | |
| 114 | |
| 115 #ifndef PRODUCT | |
| 116 JNIHandleBlock* _block_list_link; // Link for list below | |
| 117 static JNIHandleBlock* _block_list; // List of all allocated blocks (for debugging only) | |
| 118 #endif | |
| 119 | |
| 120 static JNIHandleBlock* _block_free_list; // Free list of currently unused blocks | |
| 121 static int _blocks_allocated; // For debugging/printing | |
| 122 | |
| 123 // Fill block with bad_handle values | |
| 124 void zap(); | |
| 125 | |
| 1010 | 126 protected: |
| 0 | 127 // No more handles in the both the current and following blocks |
| 128 void clear() { _top = 0; } | |
| 129 | |
| 1010 | 130 private: |
| 0 | 131 // Free list computation |
| 132 void rebuild_free_list(); | |
| 133 | |
| 134 public: | |
| 135 // Handle allocation | |
| 136 jobject allocate_handle(oop obj); | |
| 137 | |
| 138 // Block allocation and block free list management | |
| 139 static JNIHandleBlock* allocate_block(Thread* thread = NULL); | |
| 140 static void release_block(JNIHandleBlock* block, Thread* thread = NULL); | |
| 141 | |
| 142 // JNI PushLocalFrame/PopLocalFrame support | |
| 143 JNIHandleBlock* pop_frame_link() const { return _pop_frame_link; } | |
| 144 void set_pop_frame_link(JNIHandleBlock* block) { _pop_frame_link = block; } | |
| 145 | |
| 146 // Stub generator support | |
| 147 static int top_offset_in_bytes() { return offset_of(JNIHandleBlock, _top); } | |
| 148 | |
| 149 // Garbage collection support | |
| 150 // Traversal of regular handles | |
| 151 void oops_do(OopClosure* f); | |
| 152 // Traversal of weak handles. Unreachable oops are cleared. | |
| 153 void weak_oops_do(BoolObjectClosure* is_alive, OopClosure* f); | |
| 154 | |
| 155 // Debugging | |
| 156 bool chain_contains(jobject handle) const; // Does this block or following blocks contain handle | |
| 157 bool contains(jobject handle) const; // Does this block contain handle | |
| 158 int length() const; // Length of chain starting with this block | |
| 159 long memory_usage() const; | |
| 160 #ifndef PRODUCT | |
| 161 static bool any_contains(jobject handle); // Does any block currently in use contain handle | |
| 162 static void print_statistics(); | |
| 163 #endif | |
| 164 }; | |
| 165 | |
| 166 | |
| 167 inline oop JNIHandles::resolve(jobject handle) { | |
| 168 oop result = (handle == NULL ? (oop)NULL : *(oop*)handle); | |
| 169 assert(result != NULL || (handle == NULL || !CheckJNICalls || is_weak_global_handle(handle)), "Invalid value read from jni handle"); | |
| 170 assert(result != badJNIHandle, "Pointing to zapped jni handle area"); | |
| 171 return result; | |
| 172 }; | |
| 173 | |
| 174 | |
| 175 inline oop JNIHandles::resolve_external_guard(jobject handle) { | |
| 176 if (handle == NULL) return NULL; | |
| 177 oop result = *(oop*)handle; | |
| 178 if (result == NULL || result == badJNIHandle) return NULL; | |
| 179 return result; | |
| 180 }; | |
| 181 | |
| 182 | |
| 183 inline oop JNIHandles::resolve_non_null(jobject handle) { | |
| 184 assert(handle != NULL, "JNI handle should not be null"); | |
| 185 oop result = *(oop*)handle; | |
| 186 assert(result != NULL, "Invalid value read from jni handle"); | |
| 187 assert(result != badJNIHandle, "Pointing to zapped jni handle area"); | |
| 188 // Don't let that private _deleted_handle object escape into the wild. | |
| 189 assert(result != deleted_handle(), "Used a deleted global handle."); | |
| 190 return result; | |
| 191 }; | |
| 192 | |
| 193 inline void JNIHandles::destroy_local(jobject handle) { | |
| 194 if (handle != NULL) { | |
| 195 *((oop*)handle) = deleted_handle(); // Mark the handle as deleted, allocate will reuse it | |
| 196 } | |
| 197 } | |
| 1972 | 198 |
| 199 #endif // SHARE_VM_RUNTIME_JNIHANDLES_HPP |