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comparison src/share/vm/code/codeCache.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // The CodeCache implements the code cache for various pieces of generated
26 // code, e.g., compiled java methods, runtime stubs, transition frames, etc.
27 // The entries in the CodeCache are all CodeBlob's.
28
29 // Implementation:
30 // - Each CodeBlob occupies one chunk of memory.
31 // - Like the offset table in oldspace the zone has at table for
32 // locating a method given a addess of an instruction.
33
34 class OopClosure;
35 class DepChange;
36
37 class CodeCache : AllStatic {
38 friend class VMStructs;
39 private:
40 // CodeHeap is malloc()'ed at startup and never deleted during shutdown,
41 // so that the generated assembly code is always there when it's needed.
42 // This may cause memory leak, but is necessary, for now. See 4423824,
43 // 4422213 or 4436291 for details.
44 static CodeHeap * _heap;
45 static int _number_of_blobs;
46 static int _number_of_nmethods_with_dependencies;
47 static bool _needs_cache_clean;
48
49 static void verify_if_often() PRODUCT_RETURN;
50 public:
51
52 // Initialization
53 static void initialize();
54
55 // Allocation/administration
56 static CodeBlob* allocate(int size); // allocates a new CodeBlob
57 static void commit(CodeBlob* cb); // called when the allocated CodeBlob has been filled
58 static int alignment_unit(); // guaranteed alignment of all CodeBlobs
59 static int alignment_offset(); // guaranteed offset of first CodeBlob byte within alignment unit (i.e., allocation header)
60 static void free(CodeBlob* cb); // frees a CodeBlob
61 static void flush(); // flushes all CodeBlobs
62 static bool contains(void *p); // returns whether p is included
63 static void blobs_do(void f(CodeBlob* cb)); // iterates over all CodeBlobs
64 static void nmethods_do(void f(nmethod* nm)); // iterates over all nmethods
65
66 // Lookup
67 static CodeBlob* find_blob(void* start);
68 static nmethod* find_nmethod(void* start);
69
70 // Lookup that does not fail if you lookup a zombie method (if you call this, be sure to know
71 // what you are doing)
72 static CodeBlob* find_blob_unsafe(void* start) {
73 CodeBlob* result = (CodeBlob*)_heap->find_start(start);
74 assert(result == NULL || result->blob_contains((address)start), "found wrong CodeBlob");
75 return result;
76 }
77
78 // Iteration
79 static CodeBlob* first();
80 static CodeBlob* next (CodeBlob* cb);
81 static CodeBlob* alive(CodeBlob *cb);
82 static nmethod* alive_nmethod(CodeBlob *cb);
83 static int nof_blobs() { return _number_of_blobs; }
84
85 // GC support
86 static void gc_epilogue();
87 static void gc_prologue();
88 // If "unloading_occurred" is true, then unloads (i.e., breaks root links
89 // to) any unmarked codeBlobs in the cache. Sets "marked_for_unloading"
90 // to "true" iff some code got unloaded.
91 static void do_unloading(BoolObjectClosure* is_alive,
92 OopClosure* keep_alive,
93 bool unloading_occurred);
94 static void oops_do(OopClosure* f);
95
96 // Printing/debugging
97 static void print() PRODUCT_RETURN; // prints summary
98 static void print_internals();
99 static void verify(); // verifies the code cache
100
101 // The full limits of the codeCache
102 static address low_bound() { return (address) _heap->low_boundary(); }
103 static address high_bound() { return (address) _heap->high_boundary(); }
104
105 // Profiling
106 static address first_address(); // first address used for CodeBlobs
107 static address last_address(); // last address used for CodeBlobs
108 static size_t capacity() { return _heap->capacity(); }
109 static size_t max_capacity() { return _heap->max_capacity(); }
110 static size_t unallocated_capacity() { return _heap->unallocated_capacity(); }
111
112 static bool needs_cache_clean() { return _needs_cache_clean; }
113 static void set_needs_cache_clean(bool v) { _needs_cache_clean = v; }
114 static void clear_inline_caches(); // clear all inline caches
115
116 // Deoptimization
117 static int mark_for_deoptimization(DepChange& changes);
118 #ifdef HOTSWAP
119 static int mark_for_evol_deoptimization(instanceKlassHandle dependee);
120 #endif // HOTSWAP
121
122 static void mark_all_nmethods_for_deoptimization();
123 static int mark_for_deoptimization(methodOop dependee);
124 static void make_marked_nmethods_zombies();
125 static void make_marked_nmethods_not_entrant();
126
127 // tells how many nmethods have dependencies
128 static int number_of_nmethods_with_dependencies();
129 };