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src/share/vm/runtime/stubCodeGenerator.hpp@eef07cd490d4 (annotated)

src/share/vm/runtime/stubCodeGenerator.hpp

Wed, 03 Jul 2019 20:42:37 +0800

author

aoqi

date

Wed, 03 Jul 2019 20:42:37 +0800

changeset 9637

eef07cd490d4

parent 9448

73d689add964

permissions

-rw-r--r--

Merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1997, 2012, 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_RUNTIME_STUBCODEGENERATOR_HPP
aoqi@0	26	#define SHARE_VM_RUNTIME_STUBCODEGENERATOR_HPP
aoqi@0	27
aoqi@0	28	#include "asm/assembler.hpp"
aoqi@0	29	#include "memory/allocation.hpp"
aoqi@0	30
aoqi@0	31	// All the basic framework for stubcode generation/debugging/printing.
aoqi@0	32
aoqi@0	33
aoqi@0	34	// A StubCodeDesc describes a piece of generated code (usually stubs).
aoqi@0	35	// This information is mainly useful for debugging and printing.
aoqi@0	36	// Currently, code descriptors are simply chained in a linked list,
aoqi@0	37	// this may have to change if searching becomes too slow.
aoqi@0	38
aoqi@0	39	class StubCodeDesc: public CHeapObj<mtCode> {
aoqi@0	40	protected:
aph@9352	41	static StubCodeDesc* volatile _list; // the list of all descriptors
aoqi@0	42	static int _count; // length of list
aoqi@0	43
aoqi@0	44	StubCodeDesc* _next; // the next element in the linked list
aoqi@0	45	const char* _group; // the group to which the stub code belongs
aoqi@0	46	const char* _name; // the name assigned to the stub code
aoqi@0	47	int _index; // serial number assigned to the stub
aoqi@0	48	address _begin; // points to the first byte of the stub code (included)
aoqi@0	49	address _end; // points to the first byte after the stub code (excluded)
aoqi@0	50
aoqi@0	51	void set_end(address end) {
aoqi@0	52	assert(_begin <= end, "begin & end not properly ordered");
aoqi@0	53	_end = end;
aoqi@0	54	}
aoqi@0	55
aoqi@0	56	void set_begin(address begin) {
aoqi@0	57	assert(begin >= _begin, "begin may not decrease");
aoqi@0	58	assert(_end == NULL || begin <= _end, "begin & end not properly ordered");
aoqi@0	59	_begin = begin;
aoqi@0	60	}
aoqi@0	61
aoqi@0	62	friend class StubCodeMark;
aoqi@0	63	friend class StubCodeGenerator;
aoqi@0	64
aoqi@0	65	public:
aoqi@0	66	static StubCodeDesc* desc_for(address pc); // returns the code descriptor for the code containing pc or NULL
aoqi@0	67	static StubCodeDesc* desc_for_index(int); // returns the code descriptor for the index or NULL
aoqi@0	68	static const char* name_for(address pc); // returns the name of the code containing pc or NULL
aoqi@0	69
aoqi@0	70	StubCodeDesc(const char* group, const char* name, address begin) {
aoqi@0	71	assert(name != NULL, "no name specified");
aph@9352	72	_next = (StubCodeDesc*)OrderAccess::load_ptr_acquire(&_list);
aoqi@0	73	_group = group;
aoqi@0	74	_name = name;
aoqi@0	75	_index = ++_count; // (never zero)
aoqi@0	76	_begin = begin;
aoqi@0	77	_end = NULL;
aph@9352	78	OrderAccess::release_store_ptr(&_list, this);
aoqi@0	79	};
aoqi@0	80
aoqi@0	81	const char* group() const { return _group; }
aoqi@0	82	const char* name() const { return _name; }
aoqi@0	83	int index() const { return _index; }
aoqi@0	84	address begin() const { return _begin; }
aoqi@0	85	address end() const { return _end; }
aoqi@0	86	int size_in_bytes() const { return _end - _begin; }
aoqi@0	87	bool contains(address pc) const { return _begin <= pc && pc < _end; }
aoqi@0	88	void print_on(outputStream* st) const;
aoqi@0	89	void print() const { print_on(tty); }
aoqi@0	90	};
aoqi@0	91
aoqi@0	92	// The base class for all stub-generating code generators.
aoqi@0	93	// Provides utility functions.
aoqi@0	94
aoqi@0	95	class StubCodeGenerator: public StackObj {
aoqi@0	96	protected:
aoqi@0	97	MacroAssembler* _masm;
aoqi@0	98
aoqi@0	99	StubCodeDesc* _first_stub;
aoqi@0	100	StubCodeDesc* _last_stub;
aoqi@0	101	bool _print_code;
aoqi@0	102
aoqi@0	103	public:
aoqi@0	104	StubCodeGenerator(CodeBuffer* code, bool print_code = false);
aoqi@0	105	~StubCodeGenerator();
aoqi@0	106
aoqi@0	107	MacroAssembler* assembler() const { return _masm; }
aoqi@0	108
aoqi@0	109	virtual void stub_prolog(StubCodeDesc* cdesc); // called by StubCodeMark constructor
aoqi@0	110	virtual void stub_epilog(StubCodeDesc* cdesc); // called by StubCodeMark destructor
aoqi@0	111	};
aoqi@0	112
aoqi@0	113
aoqi@0	114	// Stack-allocated helper class used to assciate a stub code with a name.
aoqi@0	115	// All stub code generating functions that use a StubCodeMark will be registered
aoqi@0	116	// in the global StubCodeDesc list and the generated stub code can be identified
aoqi@0	117	// later via an address pointing into it.
aoqi@0	118
aoqi@0	119	class StubCodeMark: public StackObj {
aoqi@0	120	protected:
aoqi@0	121	StubCodeGenerator* _cgen;
aoqi@0	122	StubCodeDesc* _cdesc;
aoqi@0	123
aoqi@0	124	public:
aoqi@0	125	StubCodeMark(StubCodeGenerator* cgen, const char* group, const char* name);
aoqi@0	126	~StubCodeMark();
aoqi@0	127
aoqi@0	128	};
aoqi@0	129
aoqi@0	130	#endif // SHARE_VM_RUNTIME_STUBCODEGENERATOR_HPP