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src/share/vm/code/pcDesc.hpp@8e954aedbb81 (annotated)

src/share/vm/code/pcDesc.hpp

Wed, 14 Oct 2009 10:36:57 -0700

author

never

date

Wed, 14 Oct 2009 10:36:57 -0700

changeset 1449

8e954aedbb81

parent 1366

72088be4b386

child 1570

e66fd840cb6b

permissions

-rw-r--r--

6889869: assert(!Interpreter::bytecode_should_reexecute(code),"should not reexecute")
Reviewed-by: jrose, kvn, cfang, 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;
cfang@1366	41	} bits;
never@1449	42	bool operator ==(const PcDescFlags& other) { return word == other.word; }
cfang@1366	43	} _flags;
cfang@1366	44
duke@435	45	public:
duke@435	46	int pc_offset() const { return _pc_offset; }
duke@435	47	int scope_decode_offset() const { return _scope_decode_offset; }
duke@435	48	int obj_decode_offset() const { return _obj_decode_offset; }
duke@435	49
duke@435	50	void set_pc_offset(int x) { _pc_offset = x; }
duke@435	51	void set_scope_decode_offset(int x) { _scope_decode_offset = x; }
duke@435	52	void set_obj_decode_offset(int x) { _obj_decode_offset = x; }
duke@435	53
duke@435	54	// Constructor (only used for static in nmethod.cpp)
duke@435	55	// Also used by ScopeDesc::sender()]
duke@435	56	PcDesc(int pc_offset, int scope_decode_offset, int obj_decode_offset);
duke@435	57
duke@435	58	enum {
duke@435	59	// upper and lower exclusive limits real offsets:
duke@435	60	lower_offset_limit = -1,
duke@435	61	upper_offset_limit = (unsigned int)-1 >> 1
duke@435	62	};
duke@435	63
cfang@1366	64	// Flags
cfang@1366	65	bool should_reexecute() const { return _flags.bits.reexecute; }
cfang@1366	66	void set_should_reexecute(bool z) { _flags.bits.reexecute = z; }
cfang@1366	67
never@1449	68	// Does pd refer to the same information as pd?
never@1449	69	bool is_same_info(const PcDesc* pd) {
never@1449	70	return _scope_decode_offset == pd->_scope_decode_offset &&
never@1449	71	_obj_decode_offset == pd->_obj_decode_offset &&
never@1449	72	_flags == pd->_flags;
never@1449	73	}
never@1449	74
duke@435	75	// Returns the real pc
duke@435	76	address real_pc(const nmethod* code) const;
duke@435	77
duke@435	78	void print(nmethod* code);
duke@435	79	bool verify(nmethod* code);
duke@435	80	};