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comparison: src/share/vm/code/codeCache.hpp

src/share/vm/code/codeCache.hpp

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1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_CODE_CODECACHE_HPP
26 #define SHARE_VM_CODE_CODECACHE_HPP
27
28 #include "code/codeBlob.hpp"
29 #include "memory/allocation.hpp"
30 #include "memory/heap.hpp"
31 #include "oops/instanceKlass.hpp"
32 #include "oops/oopsHierarchy.hpp"
33
34 // The CodeCache implements the code cache for various pieces of generated
35 // code, e.g., compiled java methods, runtime stubs, transition frames, etc.
36 // The entries in the CodeCache are all CodeBlob's.
37
38 // Implementation:
39 // - Each CodeBlob occupies one chunk of memory.
40 // - Like the offset table in oldspace the zone has at table for
41 // locating a method given a addess of an instruction.
42
43 class OopClosure;
44 class DepChange;
45
46 class CodeCache : AllStatic {
47 friend class VMStructs;
48 private:
49 // CodeHeap is malloc()'ed at startup and never deleted during shutdown,
50 // so that the generated assembly code is always there when it's needed.
51 // This may cause memory leak, but is necessary, for now. See 4423824,
52 // 4422213 or 4436291 for details.
53 static CodeHeap * _heap;
54 static int _number_of_blobs;
55 static int _number_of_adapters;
56 static int _number_of_nmethods;
57 static int _number_of_nmethods_with_dependencies;
58 static bool _needs_cache_clean;
59 static nmethod* _scavenge_root_nmethods; // linked via nm->scavenge_root_link()
60
61 static void verify_if_often() PRODUCT_RETURN;
62
63 static void mark_scavenge_root_nmethods() PRODUCT_RETURN;
64 static void verify_perm_nmethods(CodeBlobClosure* f_or_null) PRODUCT_RETURN;
65
66 static int _codemem_full_count;
67
68 public:
69
70 // Initialization
71 static void initialize();
72
73 static void report_codemem_full();
74
75 // Allocation/administration
76 static CodeBlob* allocate(int size, bool is_critical = false); // allocates a new CodeBlob
77 static void commit(CodeBlob* cb); // called when the allocated CodeBlob has been filled
78 static int alignment_unit(); // guaranteed alignment of all CodeBlobs
79 static int alignment_offset(); // guaranteed offset of first CodeBlob byte within alignment unit (i.e., allocation header)
80 static void free(CodeBlob* cb); // frees a CodeBlob
81 static void flush(); // flushes all CodeBlobs
82 static bool contains(void *p); // returns whether p is included
83 static void blobs_do(void f(CodeBlob* cb)); // iterates over all CodeBlobs
84 static void blobs_do(CodeBlobClosure* f); // iterates over all CodeBlobs
85 static void nmethods_do(void f(nmethod* nm)); // iterates over all nmethods
86 static void alive_nmethods_do(void f(nmethod* nm)); // iterates over all alive nmethods
87
88 // Lookup
89 static CodeBlob* find_blob(void* start);
90 static nmethod* find_nmethod(void* start);
91
92 // Lookup that does not fail if you lookup a zombie method (if you call this, be sure to know
93 // what you are doing)
94 static CodeBlob* find_blob_unsafe(void* start) {
95 // NMT can walk the stack before code cache is created
96 if (_heap == NULL) return NULL;
97
98 CodeBlob* result = (CodeBlob*)_heap->find_start(start);
99 // this assert is too strong because the heap code will return the
100 // heapblock containing start. That block can often be larger than
101 // the codeBlob itself. If you look up an address that is within
102 // the heapblock but not in the codeBlob you will assert.
103 //
104 // Most things will not lookup such bad addresses. However
105 // AsyncGetCallTrace can see intermediate frames and get that kind
106 // of invalid address and so can a developer using hsfind.
107 //
108 // The more correct answer is to return NULL if blob_contains() returns
109 // false.
110 // assert(result == NULL || result->blob_contains((address)start), "found wrong CodeBlob");
111
112 if (result != NULL && !result->blob_contains((address)start)) {
113 result = NULL;
114 }
115 return result;
116 }
117
118 // Iteration
119 static CodeBlob* first();
120 static CodeBlob* next (CodeBlob* cb);
121 static CodeBlob* alive(CodeBlob *cb);
122 static nmethod* alive_nmethod(CodeBlob *cb);
123 static nmethod* first_nmethod();
124 static nmethod* next_nmethod (CodeBlob* cb);
125 static int nof_blobs() { return _number_of_blobs; }
126 static int nof_adapters() { return _number_of_adapters; }
127 static int nof_nmethods() { return _number_of_nmethods; }
128
129 // GC support
130 static void gc_epilogue();
131 static void gc_prologue();
132 static void verify_oops();
133 // If "unloading_occurred" is true, then unloads (i.e., breaks root links
134 // to) any unmarked codeBlobs in the cache. Sets "marked_for_unloading"
135 // to "true" iff some code got unloaded.
136 static void do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred);
137 static void oops_do(OopClosure* f) {
138 CodeBlobToOopClosure oopc(f, /*do_marking=*/ false);
139 blobs_do(&oopc);
140 }
141 static void asserted_non_scavengable_nmethods_do(CodeBlobClosure* f = NULL) PRODUCT_RETURN;
142 static void scavenge_root_nmethods_do(CodeBlobClosure* f);
143
144 static nmethod* scavenge_root_nmethods() { return _scavenge_root_nmethods; }
145 static void set_scavenge_root_nmethods(nmethod* nm) { _scavenge_root_nmethods = nm; }
146 static void add_scavenge_root_nmethod(nmethod* nm);
147 static void drop_scavenge_root_nmethod(nmethod* nm);
148 static void prune_scavenge_root_nmethods();
149
150 // Printing/debugging
151 static void print(); // prints summary
152 static void print_internals();
153 static void verify(); // verifies the code cache
154 static void print_trace(const char* event, CodeBlob* cb, int size = 0) PRODUCT_RETURN;
155 static void print_summary(outputStream* st, bool detailed = true); // Prints a summary of the code cache usage
156 static void log_state(outputStream* st);
157
158 // The full limits of the codeCache
159 static address low_bound() { return (address) _heap->low_boundary(); }
160 static address high_bound() { return (address) _heap->high_boundary(); }
161 static address high() { return (address) _heap->high(); }
162
163 // Profiling
164 static address first_address(); // first address used for CodeBlobs
165 static address last_address(); // last address used for CodeBlobs
166 static size_t capacity() { return _heap->capacity(); }
167 static size_t max_capacity() { return _heap->max_capacity(); }
168 static size_t unallocated_capacity() { return _heap->unallocated_capacity(); }
169 static double reverse_free_ratio();
170
171 static bool needs_cache_clean() { return _needs_cache_clean; }
172 static void set_needs_cache_clean(bool v) { _needs_cache_clean = v; }
173 static void clear_inline_caches(); // clear all inline caches
174
175 // Deoptimization
176 static int mark_for_deoptimization(DepChange& changes);
177 #ifdef HOTSWAP
178 static int mark_for_evol_deoptimization(instanceKlassHandle dependee);
179 #endif // HOTSWAP
180
181 static void mark_all_nmethods_for_deoptimization();
182 static int mark_for_deoptimization(Method* dependee);
183 static void make_marked_nmethods_zombies();
184 static void make_marked_nmethods_not_entrant();
185
186 // tells how many nmethods have dependencies
187 static int number_of_nmethods_with_dependencies();
188
189 static int get_codemem_full_count() { return _codemem_full_count; }
190 };
191
192 #endif // SHARE_VM_CODE_CODECACHE_HPP

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