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src/share/vm/code/codeCache.hpp@04d83ba48607 (annotated)

src/share/vm/code/codeCache.hpp

Thu, 24 May 2018 17:06:56 +0800

author

aoqi

date

Thu, 24 May 2018 17:06:56 +0800

changeset 8604

04d83ba48607

parent 8074

c1950f51ed60

parent 7535

7ae4e26cb1e0

child 9703

2fdf635bcf28

permissions

-rw-r--r--

Merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#ifndef SHARE_VM_CODE_CODECACHE_HPP
aoqi@0	26	#define SHARE_VM_CODE_CODECACHE_HPP
aoqi@0	27
aoqi@0	28	#include "code/codeBlob.hpp"
aoqi@0	29	#include "memory/allocation.hpp"
aoqi@0	30	#include "memory/heap.hpp"
aoqi@0	31	#include "oops/instanceKlass.hpp"
aoqi@0	32	#include "oops/oopsHierarchy.hpp"
aoqi@0	33
aoqi@0	34	// The CodeCache implements the code cache for various pieces of generated
aoqi@0	35	// code, e.g., compiled java methods, runtime stubs, transition frames, etc.
aoqi@0	36	// The entries in the CodeCache are all CodeBlob's.
aoqi@0	37
aoqi@0	38	// Implementation:
aoqi@0	39	// - Each CodeBlob occupies one chunk of memory.
aoqi@0	40	// - Like the offset table in oldspace the zone has at table for
aoqi@0	41	// locating a method given a addess of an instruction.
aoqi@0	42
aoqi@0	43	class OopClosure;
aoqi@0	44	class DepChange;
aoqi@0	45
aoqi@0	46	class CodeCache : AllStatic {
aoqi@0	47	friend class VMStructs;
aoqi@0	48	private:
aoqi@0	49	// CodeHeap is malloc()'ed at startup and never deleted during shutdown,
aoqi@0	50	// so that the generated assembly code is always there when it's needed.
aoqi@0	51	// This may cause memory leak, but is necessary, for now. See 4423824,
aoqi@0	52	// 4422213 or 4436291 for details.
aoqi@0	53	static CodeHeap * _heap;
aoqi@0	54	static int _number_of_blobs;
aoqi@0	55	static int _number_of_adapters;
aoqi@0	56	static int _number_of_nmethods;
aoqi@0	57	static int _number_of_nmethods_with_dependencies;
aoqi@0	58	static bool _needs_cache_clean;
aoqi@0	59	static nmethod* _scavenge_root_nmethods; // linked via nm->scavenge_root_link()
aoqi@0	60
aoqi@0	61	static void verify_if_often() PRODUCT_RETURN;
aoqi@0	62
aoqi@0	63	static void mark_scavenge_root_nmethods() PRODUCT_RETURN;
aoqi@0	64	static void verify_perm_nmethods(CodeBlobClosure* f_or_null) PRODUCT_RETURN;
aoqi@0	65
aoqi@0	66	static int _codemem_full_count;
aoqi@0	67
aoqi@0	68	public:
aoqi@0	69
aoqi@0	70	// Initialization
aoqi@0	71	static void initialize();
aoqi@0	72
aoqi@0	73	static void report_codemem_full();
aoqi@0	74
aoqi@0	75	// Allocation/administration
aoqi@0	76	static CodeBlob* allocate(int size, bool is_critical = false); // allocates a new CodeBlob
aoqi@0	77	static void commit(CodeBlob* cb); // called when the allocated CodeBlob has been filled
aoqi@0	78	static int alignment_unit(); // guaranteed alignment of all CodeBlobs
aoqi@0	79	static int alignment_offset(); // guaranteed offset of first CodeBlob byte within alignment unit (i.e., allocation header)
aoqi@0	80	static void free(CodeBlob* cb); // frees a CodeBlob
aoqi@0	81	static void flush(); // flushes all CodeBlobs
aoqi@0	82	static bool contains(void *p); // returns whether p is included
aoqi@0	83	static void blobs_do(void f(CodeBlob* cb)); // iterates over all CodeBlobs
aoqi@0	84	static void blobs_do(CodeBlobClosure* f); // iterates over all CodeBlobs
aoqi@0	85	static void nmethods_do(void f(nmethod* nm)); // iterates over all nmethods
aoqi@0	86	static void alive_nmethods_do(void f(nmethod* nm)); // iterates over all alive nmethods
aoqi@0	87
aoqi@0	88	// Lookup
aoqi@0	89	static CodeBlob* find_blob(void* start);
aoqi@0	90	static nmethod* find_nmethod(void* start);
aoqi@0	91
aoqi@0	92	// Lookup that does not fail if you lookup a zombie method (if you call this, be sure to know
aoqi@0	93	// what you are doing)
aoqi@0	94	static CodeBlob* find_blob_unsafe(void* start) {
aoqi@0	95	// NMT can walk the stack before code cache is created
aoqi@0	96	if (_heap == NULL) return NULL;
aoqi@0	97
aoqi@0	98	CodeBlob* result = (CodeBlob*)_heap->find_start(start);
aoqi@0	99	// this assert is too strong because the heap code will return the
aoqi@0	100	// heapblock containing start. That block can often be larger than
aoqi@0	101	// the codeBlob itself. If you look up an address that is within
aoqi@0	102	// the heapblock but not in the codeBlob you will assert.
aoqi@0	103	//
aoqi@0	104	// Most things will not lookup such bad addresses. However
aoqi@0	105	// AsyncGetCallTrace can see intermediate frames and get that kind
aoqi@0	106	// of invalid address and so can a developer using hsfind.
aoqi@0	107	//
aoqi@0	108	// The more correct answer is to return NULL if blob_contains() returns
aoqi@0	109	// false.
aoqi@0	110	// assert(result == NULL || result->blob_contains((address)start), "found wrong CodeBlob");
aoqi@0	111
aoqi@0	112	if (result != NULL && !result->blob_contains((address)start)) {
aoqi@0	113	result = NULL;
aoqi@0	114	}
aoqi@0	115	return result;
aoqi@0	116	}
aoqi@0	117
aoqi@0	118	// Iteration
aoqi@0	119	static CodeBlob* first();
aoqi@0	120	static CodeBlob* next (CodeBlob* cb);
aoqi@0	121	static CodeBlob* alive(CodeBlob *cb);
aoqi@0	122	static nmethod* alive_nmethod(CodeBlob *cb);
aoqi@0	123	static nmethod* first_nmethod();
aoqi@0	124	static nmethod* next_nmethod (CodeBlob* cb);
aoqi@0	125	static int nof_blobs() { return _number_of_blobs; }
aoqi@0	126	static int nof_adapters() { return _number_of_adapters; }
aoqi@0	127	static int nof_nmethods() { return _number_of_nmethods; }
aoqi@0	128
aoqi@0	129	// GC support
aoqi@0	130	static void gc_epilogue();
aoqi@0	131	static void gc_prologue();
aoqi@0	132	static void verify_oops();
aoqi@0	133	// If "unloading_occurred" is true, then unloads (i.e., breaks root links
aoqi@0	134	// to) any unmarked codeBlobs in the cache. Sets "marked_for_unloading"
aoqi@0	135	// to "true" iff some code got unloaded.
aoqi@0	136	static void do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred);
aoqi@0	137	static void asserted_non_scavengable_nmethods_do(CodeBlobClosure* f = NULL) PRODUCT_RETURN;
aoqi@0	138	static void scavenge_root_nmethods_do(CodeBlobClosure* f);
aoqi@0	139
aoqi@0	140	static nmethod* scavenge_root_nmethods() { return _scavenge_root_nmethods; }
aoqi@0	141	static void set_scavenge_root_nmethods(nmethod* nm) { _scavenge_root_nmethods = nm; }
aoqi@0	142	static void add_scavenge_root_nmethod(nmethod* nm);
aoqi@0	143	static void drop_scavenge_root_nmethod(nmethod* nm);
aoqi@0	144	static void prune_scavenge_root_nmethods();
aoqi@0	145
aoqi@0	146	// Printing/debugging
aoqi@0	147	static void print(); // prints summary
aoqi@0	148	static void print_internals();
aoqi@0	149	static void verify(); // verifies the code cache
aoqi@0	150	static void print_trace(const char* event, CodeBlob* cb, int size = 0) PRODUCT_RETURN;
aoqi@0	151	static void print_summary(outputStream* st, bool detailed = true); // Prints a summary of the code cache usage
aoqi@0	152	static void log_state(outputStream* st);
aoqi@0	153
aoqi@0	154	// The full limits of the codeCache
aoqi@0	155	static address low_bound() { return (address) _heap->low_boundary(); }
aoqi@0	156	static address high_bound() { return (address) _heap->high_boundary(); }
aoqi@0	157	static address high() { return (address) _heap->high(); }
aoqi@0	158
aoqi@0	159	// Profiling
aoqi@0	160	static address first_address(); // first address used for CodeBlobs
aoqi@0	161	static address last_address(); // last address used for CodeBlobs
aoqi@0	162	static size_t capacity() { return _heap->capacity(); }
aoqi@0	163	static size_t max_capacity() { return _heap->max_capacity(); }
aoqi@0	164	static size_t unallocated_capacity() { return _heap->unallocated_capacity(); }
aoqi@0	165	static double reverse_free_ratio();
aoqi@0	166
aoqi@0	167	static bool needs_cache_clean() { return _needs_cache_clean; }
aoqi@0	168	static void set_needs_cache_clean(bool v) { _needs_cache_clean = v; }
aoqi@0	169	static void clear_inline_caches(); // clear all inline caches
aoqi@0	170
stefank@6992	171	static void verify_clean_inline_caches();
stefank@6992	172	static void verify_icholder_relocations();
stefank@6992	173
aoqi@0	174	// Deoptimization
aoqi@0	175	static int mark_for_deoptimization(DepChange& changes);
aoqi@0	176	#ifdef HOTSWAP
aoqi@0	177	static int mark_for_evol_deoptimization(instanceKlassHandle dependee);
aoqi@0	178	#endif // HOTSWAP
aoqi@0	179
aoqi@0	180	static void mark_all_nmethods_for_deoptimization();
aoqi@0	181	static int mark_for_deoptimization(Method* dependee);
aoqi@0	182	static void make_marked_nmethods_not_entrant();
aoqi@0	183
aoqi@0	184	// tells how many nmethods have dependencies
aoqi@0	185	static int number_of_nmethods_with_dependencies();
aoqi@0	186
aoqi@0	187	static int get_codemem_full_count() { return _codemem_full_count; }
aoqi@0	188	};
aoqi@0	189
aoqi@0	190	#endif // SHARE_VM_CODE_CODECACHE_HPP