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src/share/vm/code/vtableStubs.hpp@a248d0be1309 (annotated)

src/share/vm/code/vtableStubs.hpp

Mon, 19 Aug 2019 10:11:31 +0200

author

neugens

date

Mon, 19 Aug 2019 10:11:31 +0200

changeset 9861

a248d0be1309

parent 9185

82f9d3b7e317

child 9203

53eec13fbaa5

permissions

-rw-r--r--

8229401: Fix JFR code cache test failures
8223689: Add JFR Thread Sampling Support
8223690: Add JFR BiasedLock Event Support
8223691: Add JFR G1 Region Type Change Event Support
8223692: Add JFR G1 Heap Summary Event Support
Summary: Backport JFR from JDK11, additional fixes
Reviewed-by: neugens, apetushkov
Contributed-by: denghui.ddh@alibaba-inc.com

duke@435	1	/*
poonam@9185	2	* Copyright (c) 1997, 2018, 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_VTABLESTUBS_HPP
stefank@2314	26	#define SHARE_VM_CODE_VTABLESTUBS_HPP
stefank@2314	27
stefank@2325	28	#include "code/vmreg.hpp"
stefank@2314	29	#include "memory/allocation.hpp"
stefank@2314	30
duke@435	31	// A VtableStub holds an individual code stub for a pair (vtable index, #args) for either itables or vtables
duke@435	32	// There's a one-to-one relationship between a VtableStub and such a pair.
duke@435	33
duke@435	34	class VtableStub {
duke@435	35	private:
duke@435	36	friend class VtableStubs;
duke@435	37
duke@435	38	static address _chunk; // For allocation
duke@435	39	static address _chunk_end; // For allocation
duke@435	40	static VMReg _receiver_location; // Where to find receiver
duke@435	41
duke@435	42	VtableStub* _next; // Pointer to next entry in hash table
duke@435	43	const short _index; // vtable index
duke@435	44	short _ame_offset; // Where an AbstractMethodError might occur
duke@435	45	short _npe_offset; // Where a NullPointerException might occur
duke@435	46	bool _is_vtable_stub; // True if vtable stub, false, is itable stub
duke@435	47	/* code follows here */ // The vtableStub code
duke@435	48
coleenp@5614	49	void* operator new(size_t size, int code_size) throw();
duke@435	50
duke@435	51	VtableStub(bool is_vtable_stub, int index)
duke@435	52	: _next(NULL), _is_vtable_stub(is_vtable_stub),
duke@435	53	_index(index), _ame_offset(-1), _npe_offset(-1) {}
duke@435	54	VtableStub* next() const { return _next; }
duke@435	55	int index() const { return _index; }
duke@435	56	static VMReg receiver_location() { return _receiver_location; }
duke@435	57	void set_next(VtableStub* n) { _next = n; }
twisti@3969	58
twisti@3969	59	public:
duke@435	60	address code_begin() const { return (address)(this + 1); }
duke@435	61	address code_end() const { return code_begin() + pd_code_size_limit(_is_vtable_stub); }
duke@435	62	address entry_point() const { return code_begin(); }
duke@435	63	static int entry_offset() { return sizeof(class VtableStub); }
duke@435	64
duke@435	65	bool matches(bool is_vtable_stub, int index) const {
duke@435	66	return _index == index && _is_vtable_stub == is_vtable_stub;
duke@435	67	}
duke@435	68	bool contains(address pc) const { return code_begin() <= pc && pc < code_end(); }
duke@435	69
twisti@3969	70	private:
duke@435	71	void set_exception_points(address npe_addr, address ame_addr) {
duke@435	72	_npe_offset = npe_addr - code_begin();
duke@435	73	_ame_offset = ame_addr - code_begin();
duke@435	74	assert(is_abstract_method_error(ame_addr), "offset must be correct");
duke@435	75	assert(is_null_pointer_exception(npe_addr), "offset must be correct");
duke@435	76	assert(!is_abstract_method_error(npe_addr), "offset must be correct");
duke@435	77	assert(!is_null_pointer_exception(ame_addr), "offset must be correct");
duke@435	78	}
duke@435	79
duke@435	80	// platform-dependent routines
duke@435	81	static int pd_code_size_limit(bool is_vtable_stub);
duke@435	82	static int pd_code_alignment();
duke@435	83	// CNC: Removed because vtable stubs are now made with an ideal graph
duke@435	84	// static bool pd_disregard_arg_size();
duke@435	85
duke@435	86	static void align_chunk() {
duke@435	87	uintptr_t off = (uintptr_t)( _chunk + sizeof(VtableStub) ) % pd_code_alignment();
duke@435	88	if (off != 0) _chunk += pd_code_alignment() - off;
duke@435	89	}
duke@435	90
duke@435	91	public:
duke@435	92	// Query
duke@435	93	bool is_itable_stub() { return !_is_vtable_stub; }
duke@435	94	bool is_vtable_stub() { return _is_vtable_stub; }
duke@435	95	bool is_abstract_method_error(address epc) { return epc == code_begin()+_ame_offset; }
duke@435	96	bool is_null_pointer_exception(address epc) { return epc == code_begin()+_npe_offset; }
duke@435	97
bobv@2036	98	void print_on(outputStream* st) const;
bobv@2036	99	void print() const { print_on(tty); }
bobv@2036	100
duke@435	101	};
duke@435	102
duke@435	103
duke@435	104	// VtableStubs creates the code stubs for compiled calls through vtables.
duke@435	105	// There is one stub per (vtable index, args_size) pair, and the stubs are
duke@435	106	// never deallocated. They don't need to be GCed because they contain no oops.
duke@435	107
duke@435	108	class VtableStubs : AllStatic {
duke@435	109	public: // N must be public (some compilers need this for _table)
duke@435	110	enum {
duke@435	111	N = 256, // size of stub table; must be power of two
duke@435	112	mask = N - 1
duke@435	113	};
duke@435	114
duke@435	115	private:
duke@435	116	static VtableStub* _table[N]; // table of existing stubs
duke@435	117	static int _number_of_vtable_stubs; // number of stubs created so far (for statistics)
duke@435	118
duke@435	119	static VtableStub* create_vtable_stub(int vtable_index);
duke@435	120	static VtableStub* create_itable_stub(int vtable_index);
duke@435	121	static VtableStub* lookup (bool is_vtable_stub, int vtable_index);
duke@435	122	static void enter (bool is_vtable_stub, int vtable_index, VtableStub* s);
duke@435	123	static inline uint hash (bool is_vtable_stub, int vtable_index);
drchase@5732	124	static address find_stub (bool is_vtable_stub, int vtable_index);
duke@435	125
duke@435	126	public:
drchase@5732	127	static address find_vtable_stub(int vtable_index) { return find_stub(true, vtable_index); }
drchase@5732	128	static address find_itable_stub(int itable_index) { return find_stub(false, itable_index); }
poonam@9185	129	static VtableStub* entry_point(address pc); // vtable stub entry point for a pc
duke@435	130	static bool contains(address pc); // is pc within any stub?
duke@435	131	static VtableStub* stub_containing(address pc); // stub containing pc or NULL
duke@435	132	static int number_of_vtable_stubs() { return _number_of_vtable_stubs; }
duke@435	133	static void initialize();
sspitsyn@6310	134	static void vtable_stub_do(void f(VtableStub*)); // iterates over all vtable stubs
duke@435	135	};
stefank@2314	136
stefank@2314	137	#endif // SHARE_VM_CODE_VTABLESTUBS_HPP