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src/share/vm/runtime/stubCodeGenerator.hpp@9f4457a14b58 (annotated)

src/share/vm/runtime/stubCodeGenerator.hpp

Wed, 09 Apr 2008 15:10:22 -0700

author

rasbold

date

Wed, 09 Apr 2008 15:10:22 -0700

changeset 544

9f4457a14b58

parent 435

a61af66fc99e

child 1907

c18cbe5936b8

permissions

-rw-r--r--

Merge

duke@435	1	/*
duke@435	2	* Copyright 1997-2000 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	// All the basic framework for stubcode generation/debugging/printing.
duke@435	26
duke@435	27
duke@435	28	// A StubCodeDesc describes a piece of generated code (usually stubs).
duke@435	29	// This information is mainly useful for debugging and printing.
duke@435	30	// Currently, code descriptors are simply chained in a linked list,
duke@435	31	// this may have to change if searching becomes too slow.
duke@435	32
duke@435	33	class StubCodeDesc: public CHeapObj {
duke@435	34	protected:
duke@435	35	static StubCodeDesc* _list; // the list of all descriptors
duke@435	36	static int _count; // length of list
duke@435	37
duke@435	38	StubCodeDesc* _next; // the next element in the linked list
duke@435	39	const char* _group; // the group to which the stub code belongs
duke@435	40	const char* _name; // the name assigned to the stub code
duke@435	41	int _index; // serial number assigned to the stub
duke@435	42	address _begin; // points to the first byte of the stub code (included)
duke@435	43	address _end; // points to the first byte after the stub code (excluded)
duke@435	44
duke@435	45	void set_end(address end) {
duke@435	46	assert(_begin <= end, "begin & end not properly ordered");
duke@435	47	_end = end;
duke@435	48	}
duke@435	49
duke@435	50	void set_begin(address begin) {
duke@435	51	assert(begin >= _begin, "begin may not decrease");
duke@435	52	assert(_end == NULL || begin <= _end, "begin & end not properly ordered");
duke@435	53	_begin = begin;
duke@435	54	}
duke@435	55
duke@435	56	friend class StubCodeMark;
duke@435	57	friend class StubCodeGenerator;
duke@435	58
duke@435	59	public:
duke@435	60	static StubCodeDesc* desc_for(address pc); // returns the code descriptor for the code containing pc or NULL
duke@435	61	static StubCodeDesc* desc_for_index(int); // returns the code descriptor for the index or NULL
duke@435	62	static const char* name_for(address pc); // returns the name of the code containing pc or NULL
duke@435	63
duke@435	64	StubCodeDesc(const char* group, const char* name, address begin) {
duke@435	65	assert(name != NULL, "no name specified");
duke@435	66	_next = _list;
duke@435	67	_group = group;
duke@435	68	_name = name;
duke@435	69	_index = ++_count; // (never zero)
duke@435	70	_begin = begin;
duke@435	71	_end = NULL;
duke@435	72	_list = this;
duke@435	73	};
duke@435	74
duke@435	75	const char* group() const { return _group; }
duke@435	76	const char* name() const { return _name; }
duke@435	77	int index() const { return _index; }
duke@435	78	address begin() const { return _begin; }
duke@435	79	address end() const { return _end; }
duke@435	80	int size_in_bytes() const { return _end - _begin; }
duke@435	81	bool contains(address pc) const { return _begin <= pc && pc < _end; }
duke@435	82	void print();
duke@435	83	};
duke@435	84
duke@435	85	// The base class for all stub-generating code generators.
duke@435	86	// Provides utility functions.
duke@435	87
duke@435	88	class StubCodeGenerator: public StackObj {
duke@435	89	protected:
duke@435	90	MacroAssembler* _masm;
duke@435	91
duke@435	92	StubCodeDesc* _first_stub;
duke@435	93	StubCodeDesc* _last_stub;
duke@435	94
duke@435	95	public:
duke@435	96	StubCodeGenerator(CodeBuffer* code);
duke@435	97	~StubCodeGenerator();
duke@435	98
duke@435	99	MacroAssembler* assembler() const { return _masm; }
duke@435	100
duke@435	101	virtual void stub_prolog(StubCodeDesc* cdesc); // called by StubCodeMark constructor
duke@435	102	virtual void stub_epilog(StubCodeDesc* cdesc); // called by StubCodeMark destructor
duke@435	103	};
duke@435	104
duke@435	105
duke@435	106	// Stack-allocated helper class used to assciate a stub code with a name.
duke@435	107	// All stub code generating functions that use a StubCodeMark will be registered
duke@435	108	// in the global StubCodeDesc list and the generated stub code can be identified
duke@435	109	// later via an address pointing into it.
duke@435	110
duke@435	111	class StubCodeMark: public StackObj {
duke@435	112	protected:
duke@435	113	StubCodeGenerator* _cgen;
duke@435	114	StubCodeDesc* _cdesc;
duke@435	115
duke@435	116	public:
duke@435	117	StubCodeMark(StubCodeGenerator* cgen, const char* group, const char* name);
duke@435	118	~StubCodeMark();
duke@435	119
duke@435	120	};