Mercurial > hg > graal-compiler
diff src/share/vm/opto/regalloc.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/opto/regalloc.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,127 @@ +/* + * Copyright 2000-2006 Sun Microsystems, Inc. All Rights Reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +#include "incls/_precompiled.incl" +#include "incls/_regalloc.cpp.incl" + +static const int NodeRegsOverflowSize = 200; + +void (*PhaseRegAlloc::_alloc_statistics[MAX_REG_ALLOCATORS])(); +int PhaseRegAlloc::_num_allocators = 0; +#ifndef PRODUCT +int PhaseRegAlloc::_total_framesize = 0; +int PhaseRegAlloc::_max_framesize = 0; +#endif + +PhaseRegAlloc::PhaseRegAlloc( uint unique, PhaseCFG &cfg, + Matcher &matcher, + void (*pr_stats)() ): + Phase(Register_Allocation), _cfg(cfg), _matcher(matcher), + _node_oops(Thread::current()->resource_area()), + _node_regs(0), + _framesize(0xdeadbeef) +{ + int i; + + for (i=0; i < _num_allocators; i++) { + if (_alloc_statistics[i] == pr_stats) + return; + } + assert((_num_allocators + 1) < MAX_REG_ALLOCATORS, "too many register allocators"); + _alloc_statistics[_num_allocators++] = pr_stats; +} + + +//------------------------------reg2offset------------------------------------- +int PhaseRegAlloc::reg2offset_unchecked( OptoReg::Name reg ) const { + // Slots below _max_in_arg_stack_reg are offset by the entire frame. + // Slots above _max_in_arg_stack_reg are frame_slots and are not offset. + int slot = (reg < _matcher._new_SP) + ? reg - OptoReg::stack0() + _framesize + : reg - _matcher._new_SP; + // Note: We use the direct formula (reg - SharedInfo::stack0) instead of + // OptoReg::reg2stack(reg), in order to avoid asserts in the latter + // function. This routine must remain unchecked, so that dump_frame() + // can do its work undisturbed. + // %%% not really clear why reg2stack would assert here + + return slot*VMRegImpl::stack_slot_size; +} + +int PhaseRegAlloc::reg2offset( OptoReg::Name reg ) const { + + // Not allowed in the out-preserve area. + // In-preserve area is allowed so Intel can fetch the return pc out. + assert( reg < _matcher._old_SP || + (reg >= OptoReg::add(_matcher._old_SP,C->out_preserve_stack_slots()) && + reg < _matcher._in_arg_limit) || + reg >= OptoReg::add(_matcher._new_SP,C->out_preserve_stack_slots()), + "register allocated in a preserve area" ); + return reg2offset_unchecked( reg ); +} + +//------------------------------offset2reg------------------------------------- +OptoReg::Name PhaseRegAlloc::offset2reg(int stk_offset) const { + int slot = stk_offset / jintSize; + int reg = (slot < (int) _framesize) + ? slot + _matcher._new_SP + : OptoReg::stack2reg(slot) - _framesize; + assert(stk_offset == reg2offset((OptoReg::Name) reg), + "offset2reg does not invert properly"); + return (OptoReg::Name) reg; +} + +//------------------------------set_oop---------------------------------------- +void PhaseRegAlloc::set_oop( const Node *n, bool is_an_oop ) { + if( is_an_oop ) { + _node_oops.set(n->_idx); + } +} + +//------------------------------is_oop----------------------------------------- +bool PhaseRegAlloc::is_oop( const Node *n ) const { + return _node_oops.test(n->_idx) != 0; +} + +// Allocate _node_regs table with at least "size" elements +void PhaseRegAlloc::alloc_node_regs(int size) { + _node_regs_max_index = size + (size >> 1) + NodeRegsOverflowSize; + _node_regs = NEW_RESOURCE_ARRAY( OptoRegPair, _node_regs_max_index ); + // We assume our caller will fill in all elements up to size-1, so + // only the extra space we allocate is initialized here. + for( uint i = size; i < _node_regs_max_index; ++i ) + _node_regs[i].set_bad(); +} + +#ifndef PRODUCT +void +PhaseRegAlloc::print_statistics() { + tty->print_cr("Total frameslots = %d, Max frameslots = %d", _total_framesize, _max_framesize); + int i; + + for (i=0; i < _num_allocators; i++) { + _alloc_statistics[i](); + } +} +#endif