| /* |
| * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_VM_CODE_CODECACHE_HPP |
| #define SHARE_VM_CODE_CODECACHE_HPP |
| |
| #include "code/codeBlob.hpp" |
| #include "memory/allocation.hpp" |
| #include "memory/heap.hpp" |
| #include "oops/instanceKlass.hpp" |
| #include "oops/oopsHierarchy.hpp" |
| |
| // The CodeCache implements the code cache for various pieces of generated |
| // code, e.g., compiled java methods, runtime stubs, transition frames, etc. |
| // The entries in the CodeCache are all CodeBlob's. |
| |
| // Implementation: |
| // - Each CodeBlob occupies one chunk of memory. |
| // - Like the offset table in oldspace the zone has at table for |
| // locating a method given a addess of an instruction. |
| |
| class OopClosure; |
| class DepChange; |
| |
| class CodeCache : AllStatic { |
| friend class VMStructs; |
| private: |
| // CodeHeap is malloc()'ed at startup and never deleted during shutdown, |
| // so that the generated assembly code is always there when it's needed. |
| // This may cause memory leak, but is necessary, for now. See 4423824, |
| // 4422213 or 4436291 for details. |
| static CodeHeap * _heap; |
| static int _number_of_blobs; |
| static int _number_of_adapters; |
| static int _number_of_nmethods; |
| static int _number_of_nmethods_with_dependencies; |
| static bool _needs_cache_clean; |
| static nmethod* _scavenge_root_nmethods; // linked via nm->scavenge_root_link() |
| static nmethod* _saved_nmethods; // Linked list of speculatively disconnected nmethods. |
| |
| static void verify_if_often() PRODUCT_RETURN; |
| |
| static void mark_scavenge_root_nmethods() PRODUCT_RETURN; |
| static void verify_perm_nmethods(CodeBlobClosure* f_or_null) PRODUCT_RETURN; |
| |
| public: |
| |
| // Initialization |
| static void initialize(); |
| |
| // Allocation/administration |
| static CodeBlob* allocate(int size, bool is_critical = false); // allocates a new CodeBlob |
| static void commit(CodeBlob* cb); // called when the allocated CodeBlob has been filled |
| static int alignment_unit(); // guaranteed alignment of all CodeBlobs |
| static int alignment_offset(); // guaranteed offset of first CodeBlob byte within alignment unit (i.e., allocation header) |
| static void free(CodeBlob* cb); // frees a CodeBlob |
| static void flush(); // flushes all CodeBlobs |
| static bool contains(void *p); // returns whether p is included |
| static void blobs_do(void f(CodeBlob* cb)); // iterates over all CodeBlobs |
| static void blobs_do(CodeBlobClosure* f); // iterates over all CodeBlobs |
| static void nmethods_do(void f(nmethod* nm)); // iterates over all nmethods |
| static void alive_nmethods_do(void f(nmethod* nm)); // iterates over all alive nmethods |
| |
| // Lookup |
| static CodeBlob* find_blob(void* start); |
| static nmethod* find_nmethod(void* start); |
| |
| // Lookup that does not fail if you lookup a zombie method (if you call this, be sure to know |
| // what you are doing) |
| static CodeBlob* find_blob_unsafe(void* start) { |
| // NMT can walk the stack before code cache is created |
| if (_heap == NULL) return NULL; |
| |
| CodeBlob* result = (CodeBlob*)_heap->find_start(start); |
| // this assert is too strong because the heap code will return the |
| // heapblock containing start. That block can often be larger than |
| // the codeBlob itself. If you look up an address that is within |
| // the heapblock but not in the codeBlob you will assert. |
| // |
| // Most things will not lookup such bad addresses. However |
| // AsyncGetCallTrace can see intermediate frames and get that kind |
| // of invalid address and so can a developer using hsfind. |
| // |
| // The more correct answer is to return NULL if blob_contains() returns |
| // false. |
| // assert(result == NULL || result->blob_contains((address)start), "found wrong CodeBlob"); |
| |
| if (result != NULL && !result->blob_contains((address)start)) { |
| result = NULL; |
| } |
| return result; |
| } |
| |
| // Iteration |
| static CodeBlob* first(); |
| static CodeBlob* next (CodeBlob* cb); |
| static CodeBlob* alive(CodeBlob *cb); |
| static nmethod* alive_nmethod(CodeBlob *cb); |
| static nmethod* first_nmethod(); |
| static nmethod* next_nmethod (CodeBlob* cb); |
| static int nof_blobs() { return _number_of_blobs; } |
| static int nof_adapters() { return _number_of_adapters; } |
| static int nof_nmethods() { return _number_of_nmethods; } |
| |
| // GC support |
| static void gc_epilogue(); |
| static void gc_prologue(); |
| static void verify_oops(); |
| // If "unloading_occurred" is true, then unloads (i.e., breaks root links |
| // to) any unmarked codeBlobs in the cache. Sets "marked_for_unloading" |
| // to "true" iff some code got unloaded. |
| static void do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred); |
| static void oops_do(OopClosure* f) { |
| CodeBlobToOopClosure oopc(f, /*do_marking=*/ false); |
| blobs_do(&oopc); |
| } |
| static void asserted_non_scavengable_nmethods_do(CodeBlobClosure* f = NULL) PRODUCT_RETURN; |
| static void scavenge_root_nmethods_do(CodeBlobClosure* f); |
| |
| static nmethod* scavenge_root_nmethods() { return _scavenge_root_nmethods; } |
| static void set_scavenge_root_nmethods(nmethod* nm) { _scavenge_root_nmethods = nm; } |
| static void add_scavenge_root_nmethod(nmethod* nm); |
| static void drop_scavenge_root_nmethod(nmethod* nm); |
| static void prune_scavenge_root_nmethods(); |
| |
| // Printing/debugging |
| static void print(); // prints summary |
| static void print_internals(); |
| static void verify(); // verifies the code cache |
| static void print_trace(const char* event, CodeBlob* cb, int size = 0) PRODUCT_RETURN; |
| static void print_summary(outputStream* st, bool detailed = true); // Prints a summary of the code cache usage |
| static void log_state(outputStream* st); |
| |
| // The full limits of the codeCache |
| static address low_bound() { return (address) _heap->low_boundary(); } |
| static address high_bound() { return (address) _heap->high_boundary(); } |
| |
| // Profiling |
| static address first_address(); // first address used for CodeBlobs |
| static address last_address(); // last address used for CodeBlobs |
| static size_t capacity() { return _heap->capacity(); } |
| static size_t max_capacity() { return _heap->max_capacity(); } |
| static size_t unallocated_capacity() { return _heap->unallocated_capacity(); } |
| static bool needs_flushing() { return unallocated_capacity() < CodeCacheFlushingMinimumFreeSpace; } |
| static double reverse_free_ratio(); |
| |
| static bool needs_cache_clean() { return _needs_cache_clean; } |
| static void set_needs_cache_clean(bool v) { _needs_cache_clean = v; } |
| static void clear_inline_caches(); // clear all inline caches |
| |
| static nmethod* reanimate_saved_code(Method* m); |
| static void remove_saved_code(nmethod* nm); |
| static void speculatively_disconnect(nmethod* nm); |
| |
| // Deoptimization |
| static int mark_for_deoptimization(DepChange& changes); |
| #ifdef HOTSWAP |
| static int mark_for_evol_deoptimization(instanceKlassHandle dependee); |
| #endif // HOTSWAP |
| |
| static void mark_all_nmethods_for_deoptimization(); |
| static int mark_for_deoptimization(Method* dependee); |
| static void make_marked_nmethods_zombies(); |
| static void make_marked_nmethods_not_entrant(); |
| |
| // tells how many nmethods have dependencies |
| static int number_of_nmethods_with_dependencies(); |
| }; |
| |
| #endif // SHARE_VM_CODE_CODECACHE_HPP |