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src/share/vm/code/pcDesc.hpp@b1f619d38249 (annotated)

src/share/vm/code/pcDesc.hpp

Tue, 05 Jan 2010 16:12:26 -0800

author

never

date

Tue, 05 Jan 2010 16:12:26 -0800

changeset 1576

b1f619d38249

parent 1570

e66fd840cb6b

child 1688

f70b0d9ab095

permissions

-rw-r--r--

6914002: unsigned compare problem after 5057818
Reviewed-by: kvn, twisti

duke@435	1	/*
cfang@1366	2	* Copyright 1997-2009 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	// PcDescs map a physical PC (given as offset from start of nmethod) to
duke@435	26	// the corresponding source scope and byte code index.
duke@435	27
duke@435	28	class nmethod;
duke@435	29
duke@435	30	class PcDesc VALUE_OBJ_CLASS_SPEC {
duke@435	31	friend class VMStructs;
duke@435	32	private:
duke@435	33	int _pc_offset; // offset from start of nmethod
duke@435	34	int _scope_decode_offset; // offset for scope in nmethod
duke@435	35	int _obj_decode_offset;
duke@435	36
cfang@1366	37	union PcDescFlags {
cfang@1366	38	int word;
cfang@1366	39	struct {
cfang@1366	40	unsigned int reexecute: 1;
twisti@1570	41	unsigned int is_method_handle_invoke: 1;
cfang@1366	42	} bits;
never@1449	43	bool operator ==(const PcDescFlags& other) { return word == other.word; }
cfang@1366	44	} _flags;
cfang@1366	45
duke@435	46	public:
duke@435	47	int pc_offset() const { return _pc_offset; }
duke@435	48	int scope_decode_offset() const { return _scope_decode_offset; }
duke@435	49	int obj_decode_offset() const { return _obj_decode_offset; }
duke@435	50
duke@435	51	void set_pc_offset(int x) { _pc_offset = x; }
duke@435	52	void set_scope_decode_offset(int x) { _scope_decode_offset = x; }
duke@435	53	void set_obj_decode_offset(int x) { _obj_decode_offset = x; }
duke@435	54
duke@435	55	// Constructor (only used for static in nmethod.cpp)
duke@435	56	// Also used by ScopeDesc::sender()]
duke@435	57	PcDesc(int pc_offset, int scope_decode_offset, int obj_decode_offset);
duke@435	58
duke@435	59	enum {
duke@435	60	// upper and lower exclusive limits real offsets:
duke@435	61	lower_offset_limit = -1,
duke@435	62	upper_offset_limit = (unsigned int)-1 >> 1
duke@435	63	};
duke@435	64
cfang@1366	65	// Flags
cfang@1366	66	bool should_reexecute() const { return _flags.bits.reexecute; }
cfang@1366	67	void set_should_reexecute(bool z) { _flags.bits.reexecute = z; }
cfang@1366	68
never@1449	69	// Does pd refer to the same information as pd?
never@1449	70	bool is_same_info(const PcDesc* pd) {
never@1449	71	return _scope_decode_offset == pd->_scope_decode_offset &&
never@1449	72	_obj_decode_offset == pd->_obj_decode_offset &&
never@1449	73	_flags == pd->_flags;
never@1449	74	}
never@1449	75
twisti@1570	76	bool is_method_handle_invoke() const { return _flags.bits.is_method_handle_invoke; }
twisti@1570	77	void set_is_method_handle_invoke(bool z) { _flags.bits.is_method_handle_invoke = z; }
twisti@1570	78
duke@435	79	// Returns the real pc
duke@435	80	address real_pc(const nmethod* code) const;
duke@435	81
duke@435	82	void print(nmethod* code);
duke@435	83	bool verify(nmethod* code);
duke@435	84	};