/* * Copyright (c) 1997, 2013, 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 -- // The CodeCache consists of multiple CodeHeaps, each of which contains // CodeBlobs of a specific CodeBlobType. Currently heaps for the following // types are available: // - Non-methods: Non-methods like Buffers, Adapters and Runtime Stubs // - Profiled nmethods: nmethods that are profiled, i.e., those // compiled at tier 2 or 3 // - Non-Profiled nmethods: nmethods that are not profiled, i.e., those // compiled at tier 1 or 4 and native methods // // Depending on the availability of compilers and TieredCompilation being // deactivated there may be fewer heaps. The size of the heaps depends on // the values of ReservedCodeCacheSize, NonProfiledCodeHeapSize and // ProfiledCodeHeapSize (see CodeCache::initialize_heaps for details). // // All methods of the CodeCache accepting a CodeBlobType only apply to // CodeBlobs of the given type. For example, iteration over the // CodeBlobs of a specific type can be done by using CodeCache::first_blob // and CodeCache::next_blob and providing the corresponding CodeBlobType. // // IMPORTANT: If you add new CodeHeaps to the code cache or change the // existing ones, make sure to adapt the dtrace scripts (jhelper.d) for // Solaris and BSD. class OopClosure; class DepChange; class HeapConfiguration; class CodeCache : AllStatic { friend class VMStructs; private: // Predicate returning true for all method heaps class IsMethodPredicate { public: bool operator()(const CodeHeap* heap) { return heap->accepts(CodeBlobType::MethodProfiled) || heap->accepts(CodeBlobType::MethodNonProfiled); } }; // CodeHeaps of the cache static GrowableArray* _heaps; static address _low_bound; // Lower bound of CodeHeap addresses static address _high_bound; // Upper bound of CodeHeap addresses static int _number_of_blobs; // Total number of CodeBlobs in the cache static int _number_of_adapters; // Total number of Adapters in the cache static int _number_of_nmethods; // Total number of nmethods in the cache static int _number_of_nmethods_with_dependencies; // Total number of nmethods with dependencies static bool _needs_cache_clean; // True if inline caches of the nmethods needs to be flushed static nmethod* _scavenge_root_nmethods; // linked via nm->scavenge_root_link() static nmethod* _saved_nmethods; // Linked list of speculatively disconnected nmethods. static int _codemem_full_count; // Number of times a CodeHeap in the cache was full // CodeHeap verification 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; // CodeHeap management static void initialize_heaps(); // Initializes the CodeHeaps // Creates a new heap with the given name and size, containing CodeBlobs of the given type static void add_heap(ReservedSpace rs, const char* name, size_t size_initial, int code_blob_type); static CodeHeap* get_code_heap(int code_blob_type); // Returns the CodeHeap for the given CodeBlobType static bool heap_available(int code_blob_type); // Returns true if a CodeHeap for the given CodeBlobType is available static ReservedCodeSpace reserve_heap_memory(size_t size); // Reserves one continuous chunk of memory for the CodeHeaps // Iteration static CodeBlob* first_blob(CodeHeap* heap); // Returns the first CodeBlob on the given CodeHeap static CodeBlob* next_blob(CodeHeap* heap, CodeBlob* cb); // Returns the first alive CodeBlob on the given CodeHeap static CodeBlob* first_alive_blob(CodeHeap* heap); // Returns the next CodeBlob on the given CodeHeap succeeding the given CodeBlob static CodeBlob* next_alive_blob(CodeHeap* heap, CodeBlob* cb); // Returns the next alive CodeBlob on the given CodeHeap succeeding the given CodeBlob public: // Initialization static void initialize(); // Allocation/administration static CodeBlob* allocate(int size, int code_blob_type, 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, int code_blob_type); // frees a CodeBlob 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); // Returns the CodeBlob containing the given address static CodeBlob* find_blob_unsafe(void* start); // Same as find_blob but does not fail if looking up a zombie method static nmethod* find_nmethod(void* start); // Returns the nmethod containing the given address static bool contains_nmethod(nmethod* nm); // Returns true if the CodeCache contains the given nmethod // Iteration // Returns the first CodeBlob of the given type static CodeBlob* first_blob(int code_blob_type) { return first_blob(get_code_heap(code_blob_type)); } // Returns the first alive CodeBlob of the given type static CodeBlob* first_alive_blob(int code_blob_type) { return first_alive_blob(get_code_heap(code_blob_type)); } // Returns the next CodeBlob of the given type succeeding the given CodeBlob static CodeBlob* next_blob(CodeBlob* cb, int code_blob_type) { return next_blob(get_code_heap(code_blob_type), cb); } // Returns the next alive CodeBlob of the given type succeeding the given CodeBlob static CodeBlob* next_alive_blob(CodeBlob* cb, int code_blob_type) { return next_alive_blob(get_code_heap(code_blob_type), cb); } static int nof_blobs() { return _number_of_blobs; } // Returns the total number of CodeBlobs in the cache static int nof_adapters() { return _number_of_adapters; } // Returns the total number of Adapters in the cache static int nof_nmethods() { return _number_of_nmethods; } // Returns the total number of nmethods in the cache // 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); static const char* get_heap_name(int code_blob_type) { return (heap_available(code_blob_type) ? get_code_heap(code_blob_type)->name() : "Unused"); } static void report_codemem_full(int code_blob_type); // The full limits of the codeCache static address low_bound() { return _low_bound; } static address high_bound() { return _high_bound; } // Profiling static size_t capacity(int code_blob_type) { return heap_available(code_blob_type) ? get_code_heap(code_blob_type)->capacity() : 0; } static size_t capacity(); static size_t unallocated_capacity(int code_blob_type) { return heap_available(code_blob_type) ? get_code_heap(code_blob_type)->unallocated_capacity() : 0; } static size_t unallocated_capacity(); static size_t max_capacity(int code_blob_type) { return heap_available(code_blob_type) ? get_code_heap(code_blob_type)->max_capacity() : 0; } static size_t max_capacity(); static bool is_full(int code_blob_type) { return heap_available(code_blob_type) && (unallocated_capacity(code_blob_type) < CodeCacheMinimumFreeSpace); } static double reverse_free_ratio(int code_blob_type); static bool needs_cache_clean() { return _needs_cache_clean; } static void set_needs_cache_clean(bool v) { _needs_cache_clean = v; } // Returns the CodeBlobType for nmethods of the given compilation level static int get_code_blob_type(int comp_level) { if (comp_level == CompLevel_none || comp_level == CompLevel_simple || comp_level == CompLevel_full_optimization) { // Non profiled methods return CodeBlobType::MethodNonProfiled; } else if (comp_level == CompLevel_limited_profile || comp_level == CompLevel_full_profile) { // Profiled methods return CodeBlobType::MethodProfiled; } ShouldNotReachHere(); return 0; } // 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(); static int get_codemem_full_count() { return _codemem_full_count; } }; #endif // SHARE_VM_CODE_CODECACHE_HPP