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src/share/vm/opto/regalloc.cpp@a9becfeecd1b (annotated)

src/share/vm/opto/regalloc.cpp

Wed, 22 Jan 2014 17:42:23 -0800

author

kvn

date

Wed, 22 Jan 2014 17:42:23 -0800

changeset 6503

a9becfeecd1b

parent 6487

15120a36272d

parent 6198

55fb97c4c58d

child 6876

710a3c8b516e

permissions

-rw-r--r--

Merge

duke@435	1	/*
mikael@6198	2	* Copyright (c) 2000, 2013, 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	#include "precompiled.hpp"
stefank@2314	26	#include "opto/regalloc.hpp"
duke@435	27
duke@435	28	static const int NodeRegsOverflowSize = 200;
duke@435	29
duke@435	30	void (*PhaseRegAlloc::_alloc_statistics[MAX_REG_ALLOCATORS])();
duke@435	31	int PhaseRegAlloc::_num_allocators = 0;
duke@435	32	#ifndef PRODUCT
duke@435	33	int PhaseRegAlloc::_total_framesize = 0;
duke@435	34	int PhaseRegAlloc::_max_framesize = 0;
duke@435	35	#endif
duke@435	36
duke@435	37	PhaseRegAlloc::PhaseRegAlloc( uint unique, PhaseCFG &cfg,
duke@435	38	Matcher &matcher,
duke@435	39	void (*pr_stats)() ):
duke@435	40	Phase(Register_Allocation), _cfg(cfg), _matcher(matcher),
duke@435	41	_node_oops(Thread::current()->resource_area()),
duke@435	42	_node_regs(0),
kvn@4478	43	_node_regs_max_index(0),
duke@435	44	_framesize(0xdeadbeef)
duke@435	45	{
duke@435	46	int i;
duke@435	47
duke@435	48	for (i=0; i < _num_allocators; i++) {
duke@435	49	if (_alloc_statistics[i] == pr_stats)
duke@435	50	return;
duke@435	51	}
duke@435	52	assert((_num_allocators + 1) < MAX_REG_ALLOCATORS, "too many register allocators");
duke@435	53	_alloc_statistics[_num_allocators++] = pr_stats;
duke@435	54	}
duke@435	55
duke@435	56
duke@435	57	//------------------------------reg2offset-------------------------------------
duke@435	58	int PhaseRegAlloc::reg2offset_unchecked( OptoReg::Name reg ) const {
duke@435	59	// Slots below _max_in_arg_stack_reg are offset by the entire frame.
duke@435	60	// Slots above _max_in_arg_stack_reg are frame_slots and are not offset.
duke@435	61	int slot = (reg < _matcher._new_SP)
duke@435	62	? reg - OptoReg::stack0() + _framesize
duke@435	63	: reg - _matcher._new_SP;
duke@435	64	// Note: We use the direct formula (reg - SharedInfo::stack0) instead of
duke@435	65	// OptoReg::reg2stack(reg), in order to avoid asserts in the latter
duke@435	66	// function. This routine must remain unchecked, so that dump_frame()
duke@435	67	// can do its work undisturbed.
duke@435	68	// %%% not really clear why reg2stack would assert here
duke@435	69
duke@435	70	return slot*VMRegImpl::stack_slot_size;
duke@435	71	}
duke@435	72
duke@435	73	int PhaseRegAlloc::reg2offset( OptoReg::Name reg ) const {
duke@435	74
duke@435	75	// Not allowed in the out-preserve area.
duke@435	76	// In-preserve area is allowed so Intel can fetch the return pc out.
duke@435	77	assert( reg < _matcher._old_SP ||
duke@435	78	(reg >= OptoReg::add(_matcher._old_SP,C->out_preserve_stack_slots()) &&
duke@435	79	reg < _matcher._in_arg_limit) ||
goetz@6487	80	reg >= OptoReg::add(_matcher._new_SP, C->out_preserve_stack_slots()) ||
goetz@6487	81	// Allow return_addr in the out-preserve area.
goetz@6487	82	reg == _matcher.return_addr(),
duke@435	83	"register allocated in a preserve area" );
duke@435	84	return reg2offset_unchecked( reg );
duke@435	85	}
duke@435	86
duke@435	87	//------------------------------offset2reg-------------------------------------
duke@435	88	OptoReg::Name PhaseRegAlloc::offset2reg(int stk_offset) const {
duke@435	89	int slot = stk_offset / jintSize;
duke@435	90	int reg = (slot < (int) _framesize)
duke@435	91	? slot + _matcher._new_SP
duke@435	92	: OptoReg::stack2reg(slot) - _framesize;
duke@435	93	assert(stk_offset == reg2offset((OptoReg::Name) reg),
duke@435	94	"offset2reg does not invert properly");
duke@435	95	return (OptoReg::Name) reg;
duke@435	96	}
duke@435	97
duke@435	98	//------------------------------set_oop----------------------------------------
duke@435	99	void PhaseRegAlloc::set_oop( const Node *n, bool is_an_oop ) {
duke@435	100	if( is_an_oop ) {
duke@435	101	_node_oops.set(n->_idx);
duke@435	102	}
duke@435	103	}
duke@435	104
duke@435	105	//------------------------------is_oop-----------------------------------------
duke@435	106	bool PhaseRegAlloc::is_oop( const Node *n ) const {
duke@435	107	return _node_oops.test(n->_idx) != 0;
duke@435	108	}
duke@435	109
duke@435	110	// Allocate _node_regs table with at least "size" elements
duke@435	111	void PhaseRegAlloc::alloc_node_regs(int size) {
duke@435	112	_node_regs_max_index = size + (size >> 1) + NodeRegsOverflowSize;
duke@435	113	_node_regs = NEW_RESOURCE_ARRAY( OptoRegPair, _node_regs_max_index );
duke@435	114	// We assume our caller will fill in all elements up to size-1, so
duke@435	115	// only the extra space we allocate is initialized here.
duke@435	116	for( uint i = size; i < _node_regs_max_index; ++i )
duke@435	117	_node_regs[i].set_bad();
duke@435	118	}
duke@435	119
duke@435	120	#ifndef PRODUCT
duke@435	121	void
duke@435	122	PhaseRegAlloc::print_statistics() {
duke@435	123	tty->print_cr("Total frameslots = %d, Max frameslots = %d", _total_framesize, _max_framesize);
duke@435	124	int i;
duke@435	125
duke@435	126	for (i=0; i < _num_allocators; i++) {
duke@435	127	_alloc_statistics[i]();
duke@435	128	}
duke@435	129	}
duke@435	130	#endif