Mercurial > hg > truffle
annotate src/share/vm/code/codeCache.hpp @ 17930:8c7ba9f705a1
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Reviewed-by: jcoomes
author | amurillo |
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date | Fri, 16 May 2014 03:28:59 -0700 |
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0 | 1 /* |
10405 | 2 * Copyright (c) 1997, 2013, 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_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 | |
0 | 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; | |
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55 static int _number_of_adapters; |
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56 static int _number_of_nmethods; |
0 | 57 static int _number_of_nmethods_with_dependencies; |
58 static bool _needs_cache_clean; | |
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59 static nmethod* _scavenge_root_nmethods; // linked via nm->scavenge_root_link() |
0 | 60 |
61 static void verify_if_often() PRODUCT_RETURN; | |
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62 |
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63 static void mark_scavenge_root_nmethods() PRODUCT_RETURN; |
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64 static void verify_perm_nmethods(CodeBlobClosure* f_or_null) PRODUCT_RETURN; |
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65 |
10405 | 66 static int _codemem_full_count; |
67 | |
0 | 68 public: |
69 | |
70 // Initialization | |
71 static void initialize(); | |
72 | |
10405 | 73 static void report_codemem_full(); |
74 | |
0 | 75 // Allocation/administration |
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76 static CodeBlob* allocate(int size, bool is_critical = false); // allocates a new CodeBlob |
0 | 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 | |
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84 static void blobs_do(CodeBlobClosure* f); // iterates over all CodeBlobs |
0 | 85 static void nmethods_do(void f(nmethod* nm)); // iterates over all nmethods |
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86 static void alive_nmethods_do(void f(nmethod* nm)); // iterates over all alive nmethods |
0 | 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) { | |
6197 | 95 // NMT can walk the stack before code cache is created |
96 if (_heap == NULL) return NULL; | |
97 | |
0 | 98 CodeBlob* result = (CodeBlob*)_heap->find_start(start); |
107
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99 // this assert is too strong because the heap code will return the |
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100 // heapblock containing start. That block can often be larger than |
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101 // the codeBlob itself. If you look up an address that is within |
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102 // the heapblock but not in the codeBlob you will assert. |
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103 // |
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104 // Most things will not lookup such bad addresses. However |
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105 // AsyncGetCallTrace can see intermediate frames and get that kind |
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106 // of invalid address and so can a developer using hsfind. |
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107 // |
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108 // The more correct answer is to return NULL if blob_contains() returns |
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109 // false. |
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110 // assert(result == NULL || result->blob_contains((address)start), "found wrong CodeBlob"); |
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111 |
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112 if (result != NULL && !result->blob_contains((address)start)) { |
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113 result = NULL; |
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114 } |
0 | 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); | |
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123 static nmethod* first_nmethod(); |
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124 static nmethod* next_nmethod (CodeBlob* cb); |
0 | 125 static int nof_blobs() { return _number_of_blobs; } |
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126 static int nof_adapters() { return _number_of_adapters; } |
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127 static int nof_nmethods() { return _number_of_nmethods; } |
0 | 128 |
129 // GC support | |
130 static void gc_epilogue(); | |
131 static void gc_prologue(); | |
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132 static void verify_oops(); |
0 | 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. | |
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136 static void do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred); |
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137 static void oops_do(OopClosure* f) { |
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138 CodeBlobToOopClosure oopc(f, /*do_marking=*/ false); |
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139 blobs_do(&oopc); |
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140 } |
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141 static void asserted_non_scavengable_nmethods_do(CodeBlobClosure* f = NULL) PRODUCT_RETURN; |
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142 static void scavenge_root_nmethods_do(CodeBlobClosure* f); |
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143 |
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144 static nmethod* scavenge_root_nmethods() { return _scavenge_root_nmethods; } |
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145 static void set_scavenge_root_nmethods(nmethod* nm) { _scavenge_root_nmethods = nm; } |
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146 static void add_scavenge_root_nmethod(nmethod* nm); |
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147 static void drop_scavenge_root_nmethod(nmethod* nm); |
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148 static void prune_scavenge_root_nmethods(); |
0 | 149 |
150 // Printing/debugging | |
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151 static void print(); // prints summary |
0 | 152 static void print_internals(); |
153 static void verify(); // verifies the code cache | |
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154 static void print_trace(const char* event, CodeBlob* cb, int size = 0) PRODUCT_RETURN; |
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155 static void print_summary(outputStream* st, bool detailed = true); // Prints a summary of the code cache usage |
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156 static void log_state(outputStream* st); |
0 | 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(); } | |
10405 | 161 static address high() { return (address) _heap->high(); } |
0 | 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(); } | |
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169 static double reverse_free_ratio(); |
0 | 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(); | |
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182 static int mark_for_deoptimization(Method* dependee); |
0 | 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(); | |
10405 | 188 |
189 static int get_codemem_full_count() { return _codemem_full_count; } | |
0 | 190 }; |
1972 | 191 |
192 #endif // SHARE_VM_CODE_CODECACHE_HPP |