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1 /*
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2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // The CodeCache implements the code cache for various pieces of generated
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26 // code, e.g., compiled java methods, runtime stubs, transition frames, etc.
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27 // The entries in the CodeCache are all CodeBlob's.
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28
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29 // Implementation:
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30 // - Each CodeBlob occupies one chunk of memory.
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31 // - Like the offset table in oldspace the zone has at table for
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32 // locating a method given a addess of an instruction.
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33
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34 class OopClosure;
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35 class DepChange;
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36
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37 class CodeCache : AllStatic {
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38 friend class VMStructs;
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39 private:
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40 // CodeHeap is malloc()'ed at startup and never deleted during shutdown,
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41 // so that the generated assembly code is always there when it's needed.
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42 // This may cause memory leak, but is necessary, for now. See 4423824,
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43 // 4422213 or 4436291 for details.
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44 static CodeHeap * _heap;
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45 static int _number_of_blobs;
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46 static int _number_of_nmethods_with_dependencies;
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47 static bool _needs_cache_clean;
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48
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49 static void verify_if_often() PRODUCT_RETURN;
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50 public:
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51
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52 // Initialization
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53 static void initialize();
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54
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55 // Allocation/administration
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56 static CodeBlob* allocate(int size); // allocates a new CodeBlob
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57 static void commit(CodeBlob* cb); // called when the allocated CodeBlob has been filled
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58 static int alignment_unit(); // guaranteed alignment of all CodeBlobs
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59 static int alignment_offset(); // guaranteed offset of first CodeBlob byte within alignment unit (i.e., allocation header)
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60 static void free(CodeBlob* cb); // frees a CodeBlob
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61 static void flush(); // flushes all CodeBlobs
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62 static bool contains(void *p); // returns whether p is included
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63 static void blobs_do(void f(CodeBlob* cb)); // iterates over all CodeBlobs
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64 static void nmethods_do(void f(nmethod* nm)); // iterates over all nmethods
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65
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66 // Lookup
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67 static CodeBlob* find_blob(void* start);
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68 static nmethod* find_nmethod(void* start);
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69
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70 // Lookup that does not fail if you lookup a zombie method (if you call this, be sure to know
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71 // what you are doing)
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72 static CodeBlob* find_blob_unsafe(void* start) {
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73 CodeBlob* result = (CodeBlob*)_heap->find_start(start);
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74 assert(result == NULL || result->blob_contains((address)start), "found wrong CodeBlob");
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75 return result;
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76 }
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77
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78 // Iteration
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79 static CodeBlob* first();
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80 static CodeBlob* next (CodeBlob* cb);
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81 static CodeBlob* alive(CodeBlob *cb);
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82 static nmethod* alive_nmethod(CodeBlob *cb);
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83 static int nof_blobs() { return _number_of_blobs; }
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84
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85 // GC support
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86 static void gc_epilogue();
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87 static void gc_prologue();
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88 // If "unloading_occurred" is true, then unloads (i.e., breaks root links
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89 // to) any unmarked codeBlobs in the cache. Sets "marked_for_unloading"
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90 // to "true" iff some code got unloaded.
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91 static void do_unloading(BoolObjectClosure* is_alive,
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92 OopClosure* keep_alive,
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93 bool unloading_occurred);
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94 static void oops_do(OopClosure* f);
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95
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96 // Printing/debugging
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97 static void print() PRODUCT_RETURN; // prints summary
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98 static void print_internals();
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99 static void verify(); // verifies the code cache
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100
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101 // The full limits of the codeCache
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102 static address low_bound() { return (address) _heap->low_boundary(); }
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103 static address high_bound() { return (address) _heap->high_boundary(); }
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104
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105 // Profiling
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106 static address first_address(); // first address used for CodeBlobs
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107 static address last_address(); // last address used for CodeBlobs
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108 static size_t capacity() { return _heap->capacity(); }
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109 static size_t max_capacity() { return _heap->max_capacity(); }
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110 static size_t unallocated_capacity() { return _heap->unallocated_capacity(); }
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111
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112 static bool needs_cache_clean() { return _needs_cache_clean; }
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113 static void set_needs_cache_clean(bool v) { _needs_cache_clean = v; }
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114 static void clear_inline_caches(); // clear all inline caches
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115
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116 // Deoptimization
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117 static int mark_for_deoptimization(DepChange& changes);
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118 #ifdef HOTSWAP
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119 static int mark_for_evol_deoptimization(instanceKlassHandle dependee);
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120 #endif // HOTSWAP
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121
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122 static void mark_all_nmethods_for_deoptimization();
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123 static int mark_for_deoptimization(methodOop dependee);
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124 static void make_marked_nmethods_zombies();
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125 static void make_marked_nmethods_not_entrant();
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126
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127 // tells how many nmethods have dependencies
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128 static int number_of_nmethods_with_dependencies();
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129 };
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