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/*
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* Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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// The CodeCache implements the code cache for various pieces of generated
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// code, e.g., compiled java methods, runtime stubs, transition frames, etc.
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// The entries in the CodeCache are all CodeBlob's.
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// Implementation:
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// - Each CodeBlob occupies one chunk of memory.
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// - Like the offset table in oldspace the zone has at table for
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// locating a method given a addess of an instruction.
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class OopClosure;
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class DepChange;
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class CodeCache : AllStatic {
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friend class VMStructs;
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private:
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// CodeHeap is malloc()'ed at startup and never deleted during shutdown,
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// so that the generated assembly code is always there when it's needed.
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// This may cause memory leak, but is necessary, for now. See 4423824,
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// 4422213 or 4436291 for details.
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static CodeHeap * _heap;
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static int _number_of_blobs;
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static int _number_of_nmethods_with_dependencies;
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static bool _needs_cache_clean;
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static void verify_if_often() PRODUCT_RETURN;
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public:
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// Initialization
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static void initialize();
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// Allocation/administration
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static CodeBlob* allocate(int size); // allocates a new CodeBlob
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static void commit(CodeBlob* cb); // called when the allocated CodeBlob has been filled
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static int alignment_unit(); // guaranteed alignment of all CodeBlobs
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static int alignment_offset(); // guaranteed offset of first CodeBlob byte within alignment unit (i.e., allocation header)
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static void free(CodeBlob* cb); // frees a CodeBlob
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static void flush(); // flushes all CodeBlobs
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static bool contains(void *p); // returns whether p is included
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static void blobs_do(void f(CodeBlob* cb)); // iterates over all CodeBlobs
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static void nmethods_do(void f(nmethod* nm)); // iterates over all nmethods
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// Lookup
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static CodeBlob* find_blob(void* start);
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static nmethod* find_nmethod(void* start);
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// Lookup that does not fail if you lookup a zombie method (if you call this, be sure to know
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// what you are doing)
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static CodeBlob* find_blob_unsafe(void* start) {
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CodeBlob* result = (CodeBlob*)_heap->find_start(start);
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assert(result == NULL || result->blob_contains((address)start), "found wrong CodeBlob");
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return result;
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}
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// Iteration
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static CodeBlob* first();
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static CodeBlob* next (CodeBlob* cb);
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static CodeBlob* alive(CodeBlob *cb);
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static nmethod* alive_nmethod(CodeBlob *cb);
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static int nof_blobs() { return _number_of_blobs; }
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// GC support
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static void gc_epilogue();
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static void gc_prologue();
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// If "unloading_occurred" is true, then unloads (i.e., breaks root links
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// to) any unmarked codeBlobs in the cache. Sets "marked_for_unloading"
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// to "true" iff some code got unloaded.
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static void do_unloading(BoolObjectClosure* is_alive,
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OopClosure* keep_alive,
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bool unloading_occurred);
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static void oops_do(OopClosure* f);
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// Printing/debugging
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static void print() PRODUCT_RETURN; // prints summary
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static void print_internals();
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static void verify(); // verifies the code cache
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// The full limits of the codeCache
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static address low_bound() { return (address) _heap->low_boundary(); }
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static address high_bound() { return (address) _heap->high_boundary(); }
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// Profiling
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static address first_address(); // first address used for CodeBlobs
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static address last_address(); // last address used for CodeBlobs
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static size_t capacity() { return _heap->capacity(); }
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static size_t max_capacity() { return _heap->max_capacity(); }
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static size_t unallocated_capacity() { return _heap->unallocated_capacity(); }
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static bool needs_cache_clean() { return _needs_cache_clean; }
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static void set_needs_cache_clean(bool v) { _needs_cache_clean = v; }
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static void clear_inline_caches(); // clear all inline caches
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// Deoptimization
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static int mark_for_deoptimization(DepChange& changes);
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#ifdef HOTSWAP
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static int mark_for_evol_deoptimization(instanceKlassHandle dependee);
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#endif // HOTSWAP
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static void mark_all_nmethods_for_deoptimization();
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static int mark_for_deoptimization(methodOop dependee);
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static void make_marked_nmethods_zombies();
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static void make_marked_nmethods_not_entrant();
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// tells how many nmethods have dependencies
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static int number_of_nmethods_with_dependencies();
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};
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