67 // address designated by the jobject to produce the corresponding
68 // jweak. Accessing the value of a jobject must account for it
69 // being a possibly offset jweak.
70 static const uintptr_t weak_tag_size = 1;
71 static const uintptr_t weak_tag_alignment = (1u << weak_tag_size);
72 static const uintptr_t weak_tag_mask = weak_tag_alignment - 1;
73 static const int weak_tag_value = 1;
74
75 // Resolve handle into oop
76 inline static oop resolve(jobject handle);
77 // Resolve handle into oop, result guaranteed not to be null
78 inline static oop resolve_non_null(jobject handle);
79 // Resolve externally provided handle into oop with some guards
80 static oop resolve_external_guard(jobject handle);
81
82 // Check for equality without keeping objects alive
83 static bool is_same_object(jobject handle1, jobject handle2);
84
85 // Local handles
86 static jobject make_local(oop obj);
87 static jobject make_local(Thread* thread, oop obj); // Faster version when current thread is known
88 inline static void destroy_local(jobject handle);
89
90 // Global handles
91 static jobject make_global(Handle obj, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
92 static void destroy_global(jobject handle);
93
94 // Weak global handles
95 static jobject make_weak_global(Handle obj, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
96 static void destroy_weak_global(jobject handle);
97 static bool is_global_weak_cleared(jweak handle); // Test jweak without resolution
98
99 // Initialization
100 static void initialize();
101
102 // Debugging
103 static void print_on(outputStream* st);
104 static void print();
105 static void verify();
106 // The category predicates all require handle != NULL.
107 static bool is_local_handle(Thread* thread, jobject handle);
108 static bool is_frame_handle(JavaThread* thread, jobject handle);
109 static bool is_global_handle(jobject handle);
110 static bool is_weak_global_handle(jobject handle);
111 static size_t global_handle_memory_usage();
112 static size_t weak_global_handle_memory_usage();
113
114 #ifndef PRODUCT
115 // Is handle from any local block of any thread?
159
160 #ifndef PRODUCT
161 JNIHandleBlock* _block_list_link; // Link for list below
162 static JNIHandleBlock* _block_list; // List of all allocated blocks (for debugging only)
163 #endif
164
165 static JNIHandleBlock* _block_free_list; // Free list of currently unused blocks
166 static int _blocks_allocated; // For debugging/printing
167
168 // Fill block with bad_handle values
169 void zap() NOT_DEBUG_RETURN;
170
171 // Free list computation
172 void rebuild_free_list();
173
174 // No more handles in the both the current and following blocks
175 void clear() { _top = 0; }
176
177 public:
178 // Handle allocation
179 jobject allocate_handle(oop obj);
180
181 // Block allocation and block free list management
182 static JNIHandleBlock* allocate_block(Thread* thread = NULL);
183 static void release_block(JNIHandleBlock* block, Thread* thread = NULL);
184
185 // JNI PushLocalFrame/PopLocalFrame support
186 JNIHandleBlock* pop_frame_link() const { return _pop_frame_link; }
187 void set_pop_frame_link(JNIHandleBlock* block) { _pop_frame_link = block; }
188
189 // Stub generator support
190 static int top_offset_in_bytes() { return offset_of(JNIHandleBlock, _top); }
191
192 // Garbage collection support
193 // Traversal of handles
194 void oops_do(OopClosure* f);
195
196 // Checked JNI support
197 void set_planned_capacity(size_t planned_capacity) { _planned_capacity = planned_capacity; }
198 const size_t get_planned_capacity() { return _planned_capacity; }
199 const size_t get_number_of_live_handles();
200
201 // Debugging
202 bool chain_contains(jobject handle) const; // Does this block or following blocks contain handle
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67 // address designated by the jobject to produce the corresponding
68 // jweak. Accessing the value of a jobject must account for it
69 // being a possibly offset jweak.
70 static const uintptr_t weak_tag_size = 1;
71 static const uintptr_t weak_tag_alignment = (1u << weak_tag_size);
72 static const uintptr_t weak_tag_mask = weak_tag_alignment - 1;
73 static const int weak_tag_value = 1;
74
75 // Resolve handle into oop
76 inline static oop resolve(jobject handle);
77 // Resolve handle into oop, result guaranteed not to be null
78 inline static oop resolve_non_null(jobject handle);
79 // Resolve externally provided handle into oop with some guards
80 static oop resolve_external_guard(jobject handle);
81
82 // Check for equality without keeping objects alive
83 static bool is_same_object(jobject handle1, jobject handle2);
84
85 // Local handles
86 static jobject make_local(oop obj);
87 static jobject make_local(Thread* thread, oop obj, // Faster version when current thread is known
88 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
89 inline static void destroy_local(jobject handle);
90
91 // Global handles
92 static jobject make_global(Handle obj,
93 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
94 static void destroy_global(jobject handle);
95
96 // Weak global handles
97 static jobject make_weak_global(Handle obj,
98 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
99 static void destroy_weak_global(jobject handle);
100 static bool is_global_weak_cleared(jweak handle); // Test jweak without resolution
101
102 // Initialization
103 static void initialize();
104
105 // Debugging
106 static void print_on(outputStream* st);
107 static void print();
108 static void verify();
109 // The category predicates all require handle != NULL.
110 static bool is_local_handle(Thread* thread, jobject handle);
111 static bool is_frame_handle(JavaThread* thread, jobject handle);
112 static bool is_global_handle(jobject handle);
113 static bool is_weak_global_handle(jobject handle);
114 static size_t global_handle_memory_usage();
115 static size_t weak_global_handle_memory_usage();
116
117 #ifndef PRODUCT
118 // Is handle from any local block of any thread?
162
163 #ifndef PRODUCT
164 JNIHandleBlock* _block_list_link; // Link for list below
165 static JNIHandleBlock* _block_list; // List of all allocated blocks (for debugging only)
166 #endif
167
168 static JNIHandleBlock* _block_free_list; // Free list of currently unused blocks
169 static int _blocks_allocated; // For debugging/printing
170
171 // Fill block with bad_handle values
172 void zap() NOT_DEBUG_RETURN;
173
174 // Free list computation
175 void rebuild_free_list();
176
177 // No more handles in the both the current and following blocks
178 void clear() { _top = 0; }
179
180 public:
181 // Handle allocation
182 jobject allocate_handle(oop obj, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
183
184 // Block allocation and block free list management
185 static JNIHandleBlock* allocate_block(Thread* thread = NULL, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM);
186 static void release_block(JNIHandleBlock* block, Thread* thread = NULL);
187
188 // JNI PushLocalFrame/PopLocalFrame support
189 JNIHandleBlock* pop_frame_link() const { return _pop_frame_link; }
190 void set_pop_frame_link(JNIHandleBlock* block) { _pop_frame_link = block; }
191
192 // Stub generator support
193 static int top_offset_in_bytes() { return offset_of(JNIHandleBlock, _top); }
194
195 // Garbage collection support
196 // Traversal of handles
197 void oops_do(OopClosure* f);
198
199 // Checked JNI support
200 void set_planned_capacity(size_t planned_capacity) { _planned_capacity = planned_capacity; }
201 const size_t get_planned_capacity() { return _planned_capacity; }
202 const size_t get_number_of_live_handles();
203
204 // Debugging
205 bool chain_contains(jobject handle) const; // Does this block or following blocks contain handle
|