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src/share/vm/code/codeCache.hpp@24128c2ffa87 (annotated)

src/share/vm/code/codeCache.hpp

Fri, 29 Jan 2010 08:33:24 -0800

author

twisti

date

Fri, 29 Jan 2010 08:33:24 -0800

changeset 1636

24128c2ffa87

parent 1424

148e5441d916

child 1637

5f24d0319e54

permissions

-rw-r--r--

6921339: backout 6917766
Reviewed-by: mr

duke@435	1	/*
xdono@631	2	* Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	// The CodeCache implements the code cache for various pieces of generated
duke@435	26	// code, e.g., compiled java methods, runtime stubs, transition frames, etc.
duke@435	27	// The entries in the CodeCache are all CodeBlob's.
duke@435	28
duke@435	29	// Implementation:
duke@435	30	// - Each CodeBlob occupies one chunk of memory.
duke@435	31	// - Like the offset table in oldspace the zone has at table for
duke@435	32	// locating a method given a addess of an instruction.
duke@435	33
duke@435	34	class OopClosure;
duke@435	35	class DepChange;
duke@435	36
duke@435	37	class CodeCache : AllStatic {
duke@435	38	friend class VMStructs;
duke@435	39	private:
duke@435	40	// CodeHeap is malloc()'ed at startup and never deleted during shutdown,
duke@435	41	// so that the generated assembly code is always there when it's needed.
duke@435	42	// This may cause memory leak, but is necessary, for now. See 4423824,
duke@435	43	// 4422213 or 4436291 for details.
duke@435	44	static CodeHeap * _heap;
duke@435	45	static int _number_of_blobs;
duke@435	46	static int _number_of_nmethods_with_dependencies;
duke@435	47	static bool _needs_cache_clean;
jrose@1424	48	static nmethod* _scavenge_root_nmethods; // linked via nm->scavenge_root_link()
duke@435	49
duke@435	50	static void verify_if_often() PRODUCT_RETURN;
jrose@1424	51
jrose@1424	52	static void mark_scavenge_root_nmethods() PRODUCT_RETURN;
jrose@1424	53	static void verify_perm_nmethods(CodeBlobClosure* f_or_null) PRODUCT_RETURN;
jrose@1424	54
duke@435	55	public:
duke@435	56
duke@435	57	// Initialization
duke@435	58	static void initialize();
duke@435	59
duke@435	60	// Allocation/administration
duke@435	61	static CodeBlob* allocate(int size); // allocates a new CodeBlob
duke@435	62	static void commit(CodeBlob* cb); // called when the allocated CodeBlob has been filled
duke@435	63	static int alignment_unit(); // guaranteed alignment of all CodeBlobs
duke@435	64	static int alignment_offset(); // guaranteed offset of first CodeBlob byte within alignment unit (i.e., allocation header)
duke@435	65	static void free(CodeBlob* cb); // frees a CodeBlob
duke@435	66	static void flush(); // flushes all CodeBlobs
duke@435	67	static bool contains(void *p); // returns whether p is included
duke@435	68	static void blobs_do(void f(CodeBlob* cb)); // iterates over all CodeBlobs
jrose@1424	69	static void blobs_do(CodeBlobClosure* f); // iterates over all CodeBlobs
duke@435	70	static void nmethods_do(void f(nmethod* nm)); // iterates over all nmethods
duke@435	71
duke@435	72	// Lookup
duke@435	73	static CodeBlob* find_blob(void* start);
duke@435	74	static nmethod* find_nmethod(void* start);
duke@435	75
duke@435	76	// Lookup that does not fail if you lookup a zombie method (if you call this, be sure to know
duke@435	77	// what you are doing)
duke@435	78	static CodeBlob* find_blob_unsafe(void* start) {
duke@435	79	CodeBlob* result = (CodeBlob*)_heap->find_start(start);
sgoldman@542	80	// this assert is too strong because the heap code will return the
sgoldman@542	81	// heapblock containing start. That block can often be larger than
sgoldman@542	82	// the codeBlob itself. If you look up an address that is within
sgoldman@542	83	// the heapblock but not in the codeBlob you will assert.
sgoldman@542	84	//
sgoldman@542	85	// Most things will not lookup such bad addresses. However
sgoldman@542	86	// AsyncGetCallTrace can see intermediate frames and get that kind
sgoldman@542	87	// of invalid address and so can a developer using hsfind.
sgoldman@542	88	//
sgoldman@542	89	// The more correct answer is to return NULL if blob_contains() returns
sgoldman@542	90	// false.
sgoldman@542	91	// assert(result == NULL || result->blob_contains((address)start), "found wrong CodeBlob");
sgoldman@542	92
sgoldman@542	93	if (result != NULL && !result->blob_contains((address)start)) {
sgoldman@542	94	result = NULL;
sgoldman@542	95	}
duke@435	96	return result;
duke@435	97	}
duke@435	98
duke@435	99	// Iteration
duke@435	100	static CodeBlob* first();
duke@435	101	static CodeBlob* next (CodeBlob* cb);
duke@435	102	static CodeBlob* alive(CodeBlob *cb);
duke@435	103	static nmethod* alive_nmethod(CodeBlob *cb);
duke@435	104	static int nof_blobs() { return _number_of_blobs; }
duke@435	105
duke@435	106	// GC support
duke@435	107	static void gc_epilogue();
duke@435	108	static void gc_prologue();
duke@435	109	// If "unloading_occurred" is true, then unloads (i.e., breaks root links
duke@435	110	// to) any unmarked codeBlobs in the cache. Sets "marked_for_unloading"
duke@435	111	// to "true" iff some code got unloaded.
duke@435	112	static void do_unloading(BoolObjectClosure* is_alive,
duke@435	113	OopClosure* keep_alive,
duke@435	114	bool unloading_occurred);
jrose@1424	115	static void oops_do(OopClosure* f) {
jrose@1424	116	CodeBlobToOopClosure oopc(f, /*do_marking=*/ false);
jrose@1424	117	blobs_do(&oopc);
jrose@1424	118	}
jrose@1424	119	static void asserted_non_scavengable_nmethods_do(CodeBlobClosure* f = NULL) PRODUCT_RETURN;
jrose@1424	120	static void scavenge_root_nmethods_do(CodeBlobClosure* f);
jrose@1424	121
jrose@1424	122	static nmethod* scavenge_root_nmethods() { return _scavenge_root_nmethods; }
jrose@1424	123	static void set_scavenge_root_nmethods(nmethod* nm) { _scavenge_root_nmethods = nm; }
jrose@1424	124	static void add_scavenge_root_nmethod(nmethod* nm);
jrose@1424	125	static void drop_scavenge_root_nmethod(nmethod* nm);
jrose@1424	126	static void prune_scavenge_root_nmethods();
duke@435	127
duke@435	128	// Printing/debugging
duke@435	129	static void print() PRODUCT_RETURN; // prints summary
duke@435	130	static void print_internals();
duke@435	131	static void verify(); // verifies the code cache
jrose@1424	132	static void print_trace(const char* event, CodeBlob* cb, int size = 0) PRODUCT_RETURN;
duke@435	133
duke@435	134	// The full limits of the codeCache
duke@435	135	static address low_bound() { return (address) _heap->low_boundary(); }
duke@435	136	static address high_bound() { return (address) _heap->high_boundary(); }
duke@435	137
duke@435	138	// Profiling
duke@435	139	static address first_address(); // first address used for CodeBlobs
duke@435	140	static address last_address(); // last address used for CodeBlobs
duke@435	141	static size_t capacity() { return _heap->capacity(); }
duke@435	142	static size_t max_capacity() { return _heap->max_capacity(); }
duke@435	143	static size_t unallocated_capacity() { return _heap->unallocated_capacity(); }
duke@435	144
duke@435	145	static bool needs_cache_clean() { return _needs_cache_clean; }
duke@435	146	static void set_needs_cache_clean(bool v) { _needs_cache_clean = v; }
duke@435	147	static void clear_inline_caches(); // clear all inline caches
duke@435	148
duke@435	149	// Deoptimization
duke@435	150	static int mark_for_deoptimization(DepChange& changes);
duke@435	151	#ifdef HOTSWAP
duke@435	152	static int mark_for_evol_deoptimization(instanceKlassHandle dependee);
duke@435	153	#endif // HOTSWAP
duke@435	154
duke@435	155	static void mark_all_nmethods_for_deoptimization();
duke@435	156	static int mark_for_deoptimization(methodOop dependee);
duke@435	157	static void make_marked_nmethods_zombies();
duke@435	158	static void make_marked_nmethods_not_entrant();
duke@435	159
duke@435	160	// tells how many nmethods have dependencies
duke@435	161	static int number_of_nmethods_with_dependencies();
duke@435	162	};