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src/share/vm/code/codeCache.hpp@2c6ef90f030a (annotated)

src/share/vm/code/codeCache.hpp

Mon, 07 Jul 2014 10:12:40 +0200

author

stefank

date

Mon, 07 Jul 2014 10:12:40 +0200

changeset 6992

2c6ef90f030a

parent 5792

510fbd28919c

child 7535

7ae4e26cb1e0

child 8074

c1950f51ed60

permissions

-rw-r--r--

8049421: G1 Class Unloading after completing a concurrent mark cycle
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com

duke@435	1	/*
sla@5237	2	* Copyright (c) 1997, 2013, Oracle and/or its affiliates. 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	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#ifndef SHARE_VM_CODE_CODECACHE_HPP
stefank@2314	26	#define SHARE_VM_CODE_CODECACHE_HPP
stefank@2314	27
stefank@2314	28	#include "code/codeBlob.hpp"
stefank@2314	29	#include "memory/allocation.hpp"
stefank@2314	30	#include "memory/heap.hpp"
stefank@2314	31	#include "oops/instanceKlass.hpp"
stefank@2314	32	#include "oops/oopsHierarchy.hpp"
stefank@2314	33
duke@435	34	// The CodeCache implements the code cache for various pieces of generated
duke@435	35	// code, e.g., compiled java methods, runtime stubs, transition frames, etc.
duke@435	36	// The entries in the CodeCache are all CodeBlob's.
duke@435	37
duke@435	38	// Implementation:
duke@435	39	// - Each CodeBlob occupies one chunk of memory.
duke@435	40	// - Like the offset table in oldspace the zone has at table for
duke@435	41	// locating a method given a addess of an instruction.
duke@435	42
duke@435	43	class OopClosure;
duke@435	44	class DepChange;
duke@435	45
duke@435	46	class CodeCache : AllStatic {
duke@435	47	friend class VMStructs;
duke@435	48	private:
duke@435	49	// CodeHeap is malloc()'ed at startup and never deleted during shutdown,
duke@435	50	// so that the generated assembly code is always there when it's needed.
duke@435	51	// This may cause memory leak, but is necessary, for now. See 4423824,
duke@435	52	// 4422213 or 4436291 for details.
duke@435	53	static CodeHeap * _heap;
duke@435	54	static int _number_of_blobs;
never@1999	55	static int _number_of_adapters;
never@1999	56	static int _number_of_nmethods;
duke@435	57	static int _number_of_nmethods_with_dependencies;
duke@435	58	static bool _needs_cache_clean;
jrose@1424	59	static nmethod* _scavenge_root_nmethods; // linked via nm->scavenge_root_link()
duke@435	60
duke@435	61	static void verify_if_often() PRODUCT_RETURN;
jrose@1424	62
jrose@1424	63	static void mark_scavenge_root_nmethods() PRODUCT_RETURN;
jrose@1424	64	static void verify_perm_nmethods(CodeBlobClosure* f_or_null) PRODUCT_RETURN;
jrose@1424	65
sla@5237	66	static int _codemem_full_count;
sla@5237	67
duke@435	68	public:
duke@435	69
duke@435	70	// Initialization
duke@435	71	static void initialize();
duke@435	72
sla@5237	73	static void report_codemem_full();
sla@5237	74
duke@435	75	// Allocation/administration
neliasso@4952	76	static CodeBlob* allocate(int size, bool is_critical = false); // allocates a new CodeBlob
duke@435	77	static void commit(CodeBlob* cb); // called when the allocated CodeBlob has been filled
duke@435	78	static int alignment_unit(); // guaranteed alignment of all CodeBlobs
duke@435	79	static int alignment_offset(); // guaranteed offset of first CodeBlob byte within alignment unit (i.e., allocation header)
duke@435	80	static void free(CodeBlob* cb); // frees a CodeBlob
duke@435	81	static void flush(); // flushes all CodeBlobs
duke@435	82	static bool contains(void *p); // returns whether p is included
duke@435	83	static void blobs_do(void f(CodeBlob* cb)); // iterates over all CodeBlobs
jrose@1424	84	static void blobs_do(CodeBlobClosure* f); // iterates over all CodeBlobs
duke@435	85	static void nmethods_do(void f(nmethod* nm)); // iterates over all nmethods
coleenp@4037	86	static void alive_nmethods_do(void f(nmethod* nm)); // iterates over all alive nmethods
duke@435	87
duke@435	88	// Lookup
duke@435	89	static CodeBlob* find_blob(void* start);
duke@435	90	static nmethod* find_nmethod(void* start);
duke@435	91
duke@435	92	// Lookup that does not fail if you lookup a zombie method (if you call this, be sure to know
duke@435	93	// what you are doing)
duke@435	94	static CodeBlob* find_blob_unsafe(void* start) {
zgu@3900	95	// NMT can walk the stack before code cache is created
zgu@3900	96	if (_heap == NULL) return NULL;
zgu@3900	97
duke@435	98	CodeBlob* result = (CodeBlob*)_heap->find_start(start);
sgoldman@542	99	// this assert is too strong because the heap code will return the
sgoldman@542	100	// heapblock containing start. That block can often be larger than
sgoldman@542	101	// the codeBlob itself. If you look up an address that is within
sgoldman@542	102	// the heapblock but not in the codeBlob you will assert.
sgoldman@542	103	//
sgoldman@542	104	// Most things will not lookup such bad addresses. However
sgoldman@542	105	// AsyncGetCallTrace can see intermediate frames and get that kind
sgoldman@542	106	// of invalid address and so can a developer using hsfind.
sgoldman@542	107	//
sgoldman@542	108	// The more correct answer is to return NULL if blob_contains() returns
sgoldman@542	109	// false.
sgoldman@542	110	// assert(result == NULL || result->blob_contains((address)start), "found wrong CodeBlob");
sgoldman@542	111
sgoldman@542	112	if (result != NULL && !result->blob_contains((address)start)) {
sgoldman@542	113	result = NULL;
sgoldman@542	114	}
duke@435	115	return result;
duke@435	116	}
duke@435	117
duke@435	118	// Iteration
duke@435	119	static CodeBlob* first();
duke@435	120	static CodeBlob* next (CodeBlob* cb);
duke@435	121	static CodeBlob* alive(CodeBlob *cb);
duke@435	122	static nmethod* alive_nmethod(CodeBlob *cb);
never@1893	123	static nmethod* first_nmethod();
never@1893	124	static nmethod* next_nmethod (CodeBlob* cb);
duke@435	125	static int nof_blobs() { return _number_of_blobs; }
never@1999	126	static int nof_adapters() { return _number_of_adapters; }
never@1999	127	static int nof_nmethods() { return _number_of_nmethods; }
duke@435	128
duke@435	129	// GC support
duke@435	130	static void gc_epilogue();
duke@435	131	static void gc_prologue();
never@2657	132	static void verify_oops();
duke@435	133	// If "unloading_occurred" is true, then unloads (i.e., breaks root links
duke@435	134	// to) any unmarked codeBlobs in the cache. Sets "marked_for_unloading"
duke@435	135	// to "true" iff some code got unloaded.
brutisso@4098	136	static void do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred);
jrose@1424	137	static void asserted_non_scavengable_nmethods_do(CodeBlobClosure* f = NULL) PRODUCT_RETURN;
jrose@1424	138	static void scavenge_root_nmethods_do(CodeBlobClosure* f);
jrose@1424	139
jrose@1424	140	static nmethod* scavenge_root_nmethods() { return _scavenge_root_nmethods; }
jrose@1424	141	static void set_scavenge_root_nmethods(nmethod* nm) { _scavenge_root_nmethods = nm; }
jrose@1424	142	static void add_scavenge_root_nmethod(nmethod* nm);
jrose@1424	143	static void drop_scavenge_root_nmethod(nmethod* nm);
jrose@1424	144	static void prune_scavenge_root_nmethods();
duke@435	145
duke@435	146	// Printing/debugging
vladidan@4438	147	static void print(); // prints summary
duke@435	148	static void print_internals();
duke@435	149	static void verify(); // verifies the code cache
jrose@1424	150	static void print_trace(const char* event, CodeBlob* cb, int size = 0) PRODUCT_RETURN;
vladidan@4438	151	static void print_summary(outputStream* st, bool detailed = true); // Prints a summary of the code cache usage
kvn@2635	152	static void log_state(outputStream* st);
duke@435	153
duke@435	154	// The full limits of the codeCache
duke@435	155	static address low_bound() { return (address) _heap->low_boundary(); }
duke@435	156	static address high_bound() { return (address) _heap->high_boundary(); }
sla@5237	157	static address high() { return (address) _heap->high(); }
duke@435	158
duke@435	159	// Profiling
duke@435	160	static address first_address(); // first address used for CodeBlobs
duke@435	161	static address last_address(); // last address used for CodeBlobs
duke@435	162	static size_t capacity() { return _heap->capacity(); }
duke@435	163	static size_t max_capacity() { return _heap->max_capacity(); }
duke@435	164	static size_t unallocated_capacity() { return _heap->unallocated_capacity(); }
anoll@5151	165	static double reverse_free_ratio();
duke@435	166
duke@435	167	static bool needs_cache_clean() { return _needs_cache_clean; }
duke@435	168	static void set_needs_cache_clean(bool v) { _needs_cache_clean = v; }
duke@435	169	static void clear_inline_caches(); // clear all inline caches
duke@435	170
stefank@6992	171	static void verify_clean_inline_caches();
stefank@6992	172	static void verify_icholder_relocations();
stefank@6992	173
duke@435	174	// Deoptimization
duke@435	175	static int mark_for_deoptimization(DepChange& changes);
duke@435	176	#ifdef HOTSWAP
duke@435	177	static int mark_for_evol_deoptimization(instanceKlassHandle dependee);
duke@435	178	#endif // HOTSWAP
duke@435	179
duke@435	180	static void mark_all_nmethods_for_deoptimization();
coleenp@4037	181	static int mark_for_deoptimization(Method* dependee);
duke@435	182	static void make_marked_nmethods_zombies();
duke@435	183	static void make_marked_nmethods_not_entrant();
duke@435	184
duke@435	185	// tells how many nmethods have dependencies
duke@435	186	static int number_of_nmethods_with_dependencies();
sla@5237	187
sla@5237	188	static int get_codemem_full_count() { return _codemem_full_count; }
duke@435	189	};
stefank@2314	190
stefank@2314	191	#endif // SHARE_VM_CODE_CODECACHE_HPP