2d2532e740
Keep an (almost) accurate running count of the reachable (live) flow graph nodes. Reviewed-by: kvn, twisti, jrose, vlivanov
3005 lines
109 KiB
C++
3005 lines
109 KiB
C++
/*
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* Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "asm/assembler.inline.hpp"
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#include "code/debugInfo.hpp"
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#include "code/debugInfoRec.hpp"
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#include "compiler/compileBroker.hpp"
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#include "compiler/oopMap.hpp"
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#include "memory/allocation.inline.hpp"
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#include "opto/callnode.hpp"
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#include "opto/cfgnode.hpp"
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#include "opto/locknode.hpp"
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#include "opto/machnode.hpp"
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#include "opto/output.hpp"
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#include "opto/regalloc.hpp"
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#include "opto/runtime.hpp"
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#include "opto/subnode.hpp"
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#include "opto/type.hpp"
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#include "runtime/handles.inline.hpp"
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#include "utilities/xmlstream.hpp"
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extern uint size_java_to_interp();
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extern uint reloc_java_to_interp();
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extern uint size_exception_handler();
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extern uint size_deopt_handler();
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#ifndef PRODUCT
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#define DEBUG_ARG(x) , x
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#else
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#define DEBUG_ARG(x)
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#endif
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extern int emit_exception_handler(CodeBuffer &cbuf);
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extern int emit_deopt_handler(CodeBuffer &cbuf);
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//------------------------------Output-----------------------------------------
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// Convert Nodes to instruction bits and pass off to the VM
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void Compile::Output() {
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// RootNode goes
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assert( _cfg->_broot->_nodes.size() == 0, "" );
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// The number of new nodes (mostly MachNop) is proportional to
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// the number of java calls and inner loops which are aligned.
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if ( C->check_node_count((NodeLimitFudgeFactor + C->java_calls()*3 +
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C->inner_loops()*(OptoLoopAlignment-1)),
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"out of nodes before code generation" ) ) {
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return;
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}
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// Make sure I can find the Start Node
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Block_Array& bbs = _cfg->_bbs;
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Block *entry = _cfg->_blocks[1];
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Block *broot = _cfg->_broot;
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const StartNode *start = entry->_nodes[0]->as_Start();
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// Replace StartNode with prolog
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MachPrologNode *prolog = new (this) MachPrologNode();
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entry->_nodes.map( 0, prolog );
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bbs.map( prolog->_idx, entry );
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bbs.map( start->_idx, NULL ); // start is no longer in any block
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// Virtual methods need an unverified entry point
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if( is_osr_compilation() ) {
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if( PoisonOSREntry ) {
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// TODO: Should use a ShouldNotReachHereNode...
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_cfg->insert( broot, 0, new (this) MachBreakpointNode() );
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}
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} else {
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if( _method && !_method->flags().is_static() ) {
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// Insert unvalidated entry point
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_cfg->insert( broot, 0, new (this) MachUEPNode() );
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}
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}
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// Break before main entry point
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if( (_method && _method->break_at_execute())
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#ifndef PRODUCT
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||(OptoBreakpoint && is_method_compilation())
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||(OptoBreakpointOSR && is_osr_compilation())
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||(OptoBreakpointC2R && !_method)
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#endif
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) {
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// checking for _method means that OptoBreakpoint does not apply to
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// runtime stubs or frame converters
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_cfg->insert( entry, 1, new (this) MachBreakpointNode() );
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}
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// Insert epilogs before every return
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for( uint i=0; i<_cfg->_num_blocks; i++ ) {
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Block *b = _cfg->_blocks[i];
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if( !b->is_connector() && b->non_connector_successor(0) == _cfg->_broot ) { // Found a program exit point?
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Node *m = b->end();
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if( m->is_Mach() && m->as_Mach()->ideal_Opcode() != Op_Halt ) {
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MachEpilogNode *epilog = new (this) MachEpilogNode(m->as_Mach()->ideal_Opcode() == Op_Return);
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b->add_inst( epilog );
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bbs.map(epilog->_idx, b);
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//_regalloc->set_bad(epilog->_idx); // Already initialized this way.
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}
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}
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}
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# ifdef ENABLE_ZAP_DEAD_LOCALS
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if ( ZapDeadCompiledLocals ) Insert_zap_nodes();
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# endif
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uint* blk_starts = NEW_RESOURCE_ARRAY(uint,_cfg->_num_blocks+1);
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blk_starts[0] = 0;
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// Initialize code buffer and process short branches.
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CodeBuffer* cb = init_buffer(blk_starts);
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if (cb == NULL || failing()) return;
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ScheduleAndBundle();
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#ifndef PRODUCT
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if (trace_opto_output()) {
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tty->print("\n---- After ScheduleAndBundle ----\n");
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for (uint i = 0; i < _cfg->_num_blocks; i++) {
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tty->print("\nBB#%03d:\n", i);
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Block *bb = _cfg->_blocks[i];
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for (uint j = 0; j < bb->_nodes.size(); j++) {
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Node *n = bb->_nodes[j];
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OptoReg::Name reg = _regalloc->get_reg_first(n);
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tty->print(" %-6s ", reg >= 0 && reg < REG_COUNT ? Matcher::regName[reg] : "");
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n->dump();
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}
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}
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}
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#endif
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if (failing()) return;
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BuildOopMaps();
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if (failing()) return;
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fill_buffer(cb, blk_starts);
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}
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bool Compile::need_stack_bang(int frame_size_in_bytes) const {
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// Determine if we need to generate a stack overflow check.
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// Do it if the method is not a stub function and
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// has java calls or has frame size > vm_page_size/8.
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return (UseStackBanging && stub_function() == NULL &&
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(has_java_calls() || frame_size_in_bytes > os::vm_page_size()>>3));
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}
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bool Compile::need_register_stack_bang() const {
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// Determine if we need to generate a register stack overflow check.
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// This is only used on architectures which have split register
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// and memory stacks (ie. IA64).
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// Bang if the method is not a stub function and has java calls
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return (stub_function() == NULL && has_java_calls());
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}
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# ifdef ENABLE_ZAP_DEAD_LOCALS
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// In order to catch compiler oop-map bugs, we have implemented
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// a debugging mode called ZapDeadCompilerLocals.
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// This mode causes the compiler to insert a call to a runtime routine,
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// "zap_dead_locals", right before each place in compiled code
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// that could potentially be a gc-point (i.e., a safepoint or oop map point).
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// The runtime routine checks that locations mapped as oops are really
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// oops, that locations mapped as values do not look like oops,
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// and that locations mapped as dead are not used later
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// (by zapping them to an invalid address).
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int Compile::_CompiledZap_count = 0;
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void Compile::Insert_zap_nodes() {
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bool skip = false;
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// Dink with static counts because code code without the extra
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// runtime calls is MUCH faster for debugging purposes
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if ( CompileZapFirst == 0 ) ; // nothing special
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else if ( CompileZapFirst > CompiledZap_count() ) skip = true;
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else if ( CompileZapFirst == CompiledZap_count() )
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warning("starting zap compilation after skipping");
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if ( CompileZapLast == -1 ) ; // nothing special
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else if ( CompileZapLast < CompiledZap_count() ) skip = true;
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else if ( CompileZapLast == CompiledZap_count() )
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warning("about to compile last zap");
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++_CompiledZap_count; // counts skipped zaps, too
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if ( skip ) return;
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if ( _method == NULL )
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return; // no safepoints/oopmaps emitted for calls in stubs,so we don't care
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// Insert call to zap runtime stub before every node with an oop map
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for( uint i=0; i<_cfg->_num_blocks; i++ ) {
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Block *b = _cfg->_blocks[i];
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for ( uint j = 0; j < b->_nodes.size(); ++j ) {
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Node *n = b->_nodes[j];
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// Determining if we should insert a zap-a-lot node in output.
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// We do that for all nodes that has oopmap info, except for calls
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// to allocation. Calls to allocation passes in the old top-of-eden pointer
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// and expect the C code to reset it. Hence, there can be no safepoints between
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// the inlined-allocation and the call to new_Java, etc.
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// We also cannot zap monitor calls, as they must hold the microlock
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// during the call to Zap, which also wants to grab the microlock.
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bool insert = n->is_MachSafePoint() && (n->as_MachSafePoint()->oop_map() != NULL);
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if ( insert ) { // it is MachSafePoint
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if ( !n->is_MachCall() ) {
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insert = false;
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} else if ( n->is_MachCall() ) {
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MachCallNode* call = n->as_MachCall();
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if (call->entry_point() == OptoRuntime::new_instance_Java() ||
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call->entry_point() == OptoRuntime::new_array_Java() ||
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call->entry_point() == OptoRuntime::multianewarray2_Java() ||
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call->entry_point() == OptoRuntime::multianewarray3_Java() ||
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call->entry_point() == OptoRuntime::multianewarray4_Java() ||
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call->entry_point() == OptoRuntime::multianewarray5_Java() ||
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call->entry_point() == OptoRuntime::slow_arraycopy_Java() ||
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call->entry_point() == OptoRuntime::complete_monitor_locking_Java()
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) {
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insert = false;
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}
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}
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if (insert) {
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Node *zap = call_zap_node(n->as_MachSafePoint(), i);
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b->_nodes.insert( j, zap );
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_cfg->_bbs.map( zap->_idx, b );
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++j;
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}
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}
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}
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}
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}
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Node* Compile::call_zap_node(MachSafePointNode* node_to_check, int block_no) {
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const TypeFunc *tf = OptoRuntime::zap_dead_locals_Type();
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CallStaticJavaNode* ideal_node =
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new (this) CallStaticJavaNode( tf,
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OptoRuntime::zap_dead_locals_stub(_method->flags().is_native()),
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"call zap dead locals stub", 0, TypePtr::BOTTOM);
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// We need to copy the OopMap from the site we're zapping at.
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// We have to make a copy, because the zap site might not be
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// a call site, and zap_dead is a call site.
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OopMap* clone = node_to_check->oop_map()->deep_copy();
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// Add the cloned OopMap to the zap node
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ideal_node->set_oop_map(clone);
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return _matcher->match_sfpt(ideal_node);
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}
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//------------------------------is_node_getting_a_safepoint--------------------
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bool Compile::is_node_getting_a_safepoint( Node* n) {
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// This code duplicates the logic prior to the call of add_safepoint
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// below in this file.
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if( n->is_MachSafePoint() ) return true;
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return false;
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}
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# endif // ENABLE_ZAP_DEAD_LOCALS
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//------------------------------compute_loop_first_inst_sizes------------------
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// Compute the size of first NumberOfLoopInstrToAlign instructions at the top
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// of a loop. When aligning a loop we need to provide enough instructions
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// in cpu's fetch buffer to feed decoders. The loop alignment could be
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// avoided if we have enough instructions in fetch buffer at the head of a loop.
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// By default, the size is set to 999999 by Block's constructor so that
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// a loop will be aligned if the size is not reset here.
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//
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// Note: Mach instructions could contain several HW instructions
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// so the size is estimated only.
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//
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void Compile::compute_loop_first_inst_sizes() {
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// The next condition is used to gate the loop alignment optimization.
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// Don't aligned a loop if there are enough instructions at the head of a loop
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// or alignment padding is larger then MaxLoopPad. By default, MaxLoopPad
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// is equal to OptoLoopAlignment-1 except on new Intel cpus, where it is
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// equal to 11 bytes which is the largest address NOP instruction.
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if( MaxLoopPad < OptoLoopAlignment-1 ) {
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uint last_block = _cfg->_num_blocks-1;
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for( uint i=1; i <= last_block; i++ ) {
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Block *b = _cfg->_blocks[i];
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// Check the first loop's block which requires an alignment.
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if( b->loop_alignment() > (uint)relocInfo::addr_unit() ) {
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uint sum_size = 0;
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uint inst_cnt = NumberOfLoopInstrToAlign;
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inst_cnt = b->compute_first_inst_size(sum_size, inst_cnt, _regalloc);
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// Check subsequent fallthrough blocks if the loop's first
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// block(s) does not have enough instructions.
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Block *nb = b;
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while( inst_cnt > 0 &&
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i < last_block &&
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!_cfg->_blocks[i+1]->has_loop_alignment() &&
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!nb->has_successor(b) ) {
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i++;
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nb = _cfg->_blocks[i];
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inst_cnt = nb->compute_first_inst_size(sum_size, inst_cnt, _regalloc);
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} // while( inst_cnt > 0 && i < last_block )
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b->set_first_inst_size(sum_size);
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} // f( b->head()->is_Loop() )
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} // for( i <= last_block )
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} // if( MaxLoopPad < OptoLoopAlignment-1 )
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}
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//----------------------shorten_branches---------------------------------------
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// The architecture description provides short branch variants for some long
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// branch instructions. Replace eligible long branches with short branches.
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void Compile::shorten_branches(uint* blk_starts, int& code_size, int& reloc_size, int& stub_size) {
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// ------------------
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// Compute size of each block, method size, and relocation information size
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uint nblocks = _cfg->_num_blocks;
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uint* jmp_offset = NEW_RESOURCE_ARRAY(uint,nblocks);
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uint* jmp_size = NEW_RESOURCE_ARRAY(uint,nblocks);
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int* jmp_nidx = NEW_RESOURCE_ARRAY(int ,nblocks);
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DEBUG_ONLY( uint *jmp_target = NEW_RESOURCE_ARRAY(uint,nblocks); )
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DEBUG_ONLY( uint *jmp_rule = NEW_RESOURCE_ARRAY(uint,nblocks); )
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bool has_short_branch_candidate = false;
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// Initialize the sizes to 0
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code_size = 0; // Size in bytes of generated code
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stub_size = 0; // Size in bytes of all stub entries
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// Size in bytes of all relocation entries, including those in local stubs.
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// Start with 2-bytes of reloc info for the unvalidated entry point
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reloc_size = 1; // Number of relocation entries
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// Make three passes. The first computes pessimistic blk_starts,
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// relative jmp_offset and reloc_size information. The second performs
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// short branch substitution using the pessimistic sizing. The
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// third inserts nops where needed.
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// Step one, perform a pessimistic sizing pass.
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uint last_call_adr = max_uint;
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uint last_avoid_back_to_back_adr = max_uint;
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uint nop_size = (new (this) MachNopNode())->size(_regalloc);
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for (uint i = 0; i < nblocks; i++) { // For all blocks
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Block *b = _cfg->_blocks[i];
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// During short branch replacement, we store the relative (to blk_starts)
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// offset of jump in jmp_offset, rather than the absolute offset of jump.
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// This is so that we do not need to recompute sizes of all nodes when
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// we compute correct blk_starts in our next sizing pass.
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jmp_offset[i] = 0;
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jmp_size[i] = 0;
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jmp_nidx[i] = -1;
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DEBUG_ONLY( jmp_target[i] = 0; )
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DEBUG_ONLY( jmp_rule[i] = 0; )
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// Sum all instruction sizes to compute block size
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uint last_inst = b->_nodes.size();
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uint blk_size = 0;
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for (uint j = 0; j < last_inst; j++) {
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Node* nj = b->_nodes[j];
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// Handle machine instruction nodes
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if (nj->is_Mach()) {
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MachNode *mach = nj->as_Mach();
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blk_size += (mach->alignment_required() - 1) * relocInfo::addr_unit(); // assume worst case padding
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reloc_size += mach->reloc();
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if( mach->is_MachCall() ) {
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MachCallNode *mcall = mach->as_MachCall();
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// This destination address is NOT PC-relative
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mcall->method_set((intptr_t)mcall->entry_point());
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if( mcall->is_MachCallJava() && mcall->as_MachCallJava()->_method ) {
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stub_size += size_java_to_interp();
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reloc_size += reloc_java_to_interp();
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}
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} else if (mach->is_MachSafePoint()) {
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// If call/safepoint are adjacent, account for possible
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// nop to disambiguate the two safepoints.
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// ScheduleAndBundle() can rearrange nodes in a block,
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// check for all offsets inside this block.
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if (last_call_adr >= blk_starts[i]) {
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blk_size += nop_size;
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}
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}
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if (mach->avoid_back_to_back()) {
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// Nop is inserted between "avoid back to back" instructions.
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// ScheduleAndBundle() can rearrange nodes in a block,
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// check for all offsets inside this block.
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if (last_avoid_back_to_back_adr >= blk_starts[i]) {
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blk_size += nop_size;
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}
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}
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if (mach->may_be_short_branch()) {
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if (!nj->is_MachBranch()) {
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#ifndef PRODUCT
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nj->dump(3);
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#endif
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Unimplemented();
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}
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assert(jmp_nidx[i] == -1, "block should have only one branch");
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jmp_offset[i] = blk_size;
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jmp_size[i] = nj->size(_regalloc);
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jmp_nidx[i] = j;
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has_short_branch_candidate = true;
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}
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}
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blk_size += nj->size(_regalloc);
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// Remember end of call offset
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if (nj->is_MachCall() && !nj->is_MachCallLeaf()) {
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last_call_adr = blk_starts[i]+blk_size;
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}
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// Remember end of avoid_back_to_back offset
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if (nj->is_Mach() && nj->as_Mach()->avoid_back_to_back()) {
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last_avoid_back_to_back_adr = blk_starts[i]+blk_size;
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}
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}
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// When the next block starts a loop, we may insert pad NOP
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// instructions. Since we cannot know our future alignment,
|
|
// assume the worst.
|
|
if (i< nblocks-1) {
|
|
Block *nb = _cfg->_blocks[i+1];
|
|
int max_loop_pad = nb->code_alignment()-relocInfo::addr_unit();
|
|
if (max_loop_pad > 0) {
|
|
assert(is_power_of_2(max_loop_pad+relocInfo::addr_unit()), "");
|
|
blk_size += max_loop_pad;
|
|
}
|
|
}
|
|
|
|
// Save block size; update total method size
|
|
blk_starts[i+1] = blk_starts[i]+blk_size;
|
|
}
|
|
|
|
// Step two, replace eligible long jumps.
|
|
bool progress = true;
|
|
uint last_may_be_short_branch_adr = max_uint;
|
|
while (has_short_branch_candidate && progress) {
|
|
progress = false;
|
|
has_short_branch_candidate = false;
|
|
int adjust_block_start = 0;
|
|
for (uint i = 0; i < nblocks; i++) {
|
|
Block *b = _cfg->_blocks[i];
|
|
int idx = jmp_nidx[i];
|
|
MachNode* mach = (idx == -1) ? NULL: b->_nodes[idx]->as_Mach();
|
|
if (mach != NULL && mach->may_be_short_branch()) {
|
|
#ifdef ASSERT
|
|
assert(jmp_size[i] > 0 && mach->is_MachBranch(), "sanity");
|
|
int j;
|
|
// Find the branch; ignore trailing NOPs.
|
|
for (j = b->_nodes.size()-1; j>=0; j--) {
|
|
Node* n = b->_nodes[j];
|
|
if (!n->is_Mach() || n->as_Mach()->ideal_Opcode() != Op_Con)
|
|
break;
|
|
}
|
|
assert(j >= 0 && j == idx && b->_nodes[j] == (Node*)mach, "sanity");
|
|
#endif
|
|
int br_size = jmp_size[i];
|
|
int br_offs = blk_starts[i] + jmp_offset[i];
|
|
|
|
// This requires the TRUE branch target be in succs[0]
|
|
uint bnum = b->non_connector_successor(0)->_pre_order;
|
|
int offset = blk_starts[bnum] - br_offs;
|
|
if (bnum > i) { // adjust following block's offset
|
|
offset -= adjust_block_start;
|
|
}
|
|
// In the following code a nop could be inserted before
|
|
// the branch which will increase the backward distance.
|
|
bool needs_padding = ((uint)br_offs == last_may_be_short_branch_adr);
|
|
if (needs_padding && offset <= 0)
|
|
offset -= nop_size;
|
|
|
|
if (_matcher->is_short_branch_offset(mach->rule(), br_size, offset)) {
|
|
// We've got a winner. Replace this branch.
|
|
MachNode* replacement = mach->as_MachBranch()->short_branch_version(this);
|
|
|
|
// Update the jmp_size.
|
|
int new_size = replacement->size(_regalloc);
|
|
int diff = br_size - new_size;
|
|
assert(diff >= (int)nop_size, "short_branch size should be smaller");
|
|
// Conservatively take into accound padding between
|
|
// avoid_back_to_back branches. Previous branch could be
|
|
// converted into avoid_back_to_back branch during next
|
|
// rounds.
|
|
if (needs_padding && replacement->avoid_back_to_back()) {
|
|
jmp_offset[i] += nop_size;
|
|
diff -= nop_size;
|
|
}
|
|
adjust_block_start += diff;
|
|
b->_nodes.map(idx, replacement);
|
|
mach->subsume_by(replacement, C);
|
|
mach = replacement;
|
|
progress = true;
|
|
|
|
jmp_size[i] = new_size;
|
|
DEBUG_ONLY( jmp_target[i] = bnum; );
|
|
DEBUG_ONLY( jmp_rule[i] = mach->rule(); );
|
|
} else {
|
|
// The jump distance is not short, try again during next iteration.
|
|
has_short_branch_candidate = true;
|
|
}
|
|
} // (mach->may_be_short_branch())
|
|
if (mach != NULL && (mach->may_be_short_branch() ||
|
|
mach->avoid_back_to_back())) {
|
|
last_may_be_short_branch_adr = blk_starts[i] + jmp_offset[i] + jmp_size[i];
|
|
}
|
|
blk_starts[i+1] -= adjust_block_start;
|
|
}
|
|
}
|
|
|
|
#ifdef ASSERT
|
|
for (uint i = 0; i < nblocks; i++) { // For all blocks
|
|
if (jmp_target[i] != 0) {
|
|
int br_size = jmp_size[i];
|
|
int offset = blk_starts[jmp_target[i]]-(blk_starts[i] + jmp_offset[i]);
|
|
if (!_matcher->is_short_branch_offset(jmp_rule[i], br_size, offset)) {
|
|
tty->print_cr("target (%d) - jmp_offset(%d) = offset (%d), jump_size(%d), jmp_block B%d, target_block B%d", blk_starts[jmp_target[i]], blk_starts[i] + jmp_offset[i], offset, br_size, i, jmp_target[i]);
|
|
}
|
|
assert(_matcher->is_short_branch_offset(jmp_rule[i], br_size, offset), "Displacement too large for short jmp");
|
|
}
|
|
}
|
|
#endif
|
|
|
|
// Step 3, compute the offsets of all blocks, will be done in fill_buffer()
|
|
// after ScheduleAndBundle().
|
|
|
|
// ------------------
|
|
// Compute size for code buffer
|
|
code_size = blk_starts[nblocks];
|
|
|
|
// Relocation records
|
|
reloc_size += 1; // Relo entry for exception handler
|
|
|
|
// Adjust reloc_size to number of record of relocation info
|
|
// Min is 2 bytes, max is probably 6 or 8, with a tax up to 25% for
|
|
// a relocation index.
|
|
// The CodeBuffer will expand the locs array if this estimate is too low.
|
|
reloc_size *= 10 / sizeof(relocInfo);
|
|
}
|
|
|
|
//------------------------------FillLocArray-----------------------------------
|
|
// Create a bit of debug info and append it to the array. The mapping is from
|
|
// Java local or expression stack to constant, register or stack-slot. For
|
|
// doubles, insert 2 mappings and return 1 (to tell the caller that the next
|
|
// entry has been taken care of and caller should skip it).
|
|
static LocationValue *new_loc_value( PhaseRegAlloc *ra, OptoReg::Name regnum, Location::Type l_type ) {
|
|
// This should never have accepted Bad before
|
|
assert(OptoReg::is_valid(regnum), "location must be valid");
|
|
return (OptoReg::is_reg(regnum))
|
|
? new LocationValue(Location::new_reg_loc(l_type, OptoReg::as_VMReg(regnum)) )
|
|
: new LocationValue(Location::new_stk_loc(l_type, ra->reg2offset(regnum)));
|
|
}
|
|
|
|
|
|
ObjectValue*
|
|
Compile::sv_for_node_id(GrowableArray<ScopeValue*> *objs, int id) {
|
|
for (int i = 0; i < objs->length(); i++) {
|
|
assert(objs->at(i)->is_object(), "corrupt object cache");
|
|
ObjectValue* sv = (ObjectValue*) objs->at(i);
|
|
if (sv->id() == id) {
|
|
return sv;
|
|
}
|
|
}
|
|
// Otherwise..
|
|
return NULL;
|
|
}
|
|
|
|
void Compile::set_sv_for_object_node(GrowableArray<ScopeValue*> *objs,
|
|
ObjectValue* sv ) {
|
|
assert(sv_for_node_id(objs, sv->id()) == NULL, "Precondition");
|
|
objs->append(sv);
|
|
}
|
|
|
|
|
|
void Compile::FillLocArray( int idx, MachSafePointNode* sfpt, Node *local,
|
|
GrowableArray<ScopeValue*> *array,
|
|
GrowableArray<ScopeValue*> *objs ) {
|
|
assert( local, "use _top instead of null" );
|
|
if (array->length() != idx) {
|
|
assert(array->length() == idx + 1, "Unexpected array count");
|
|
// Old functionality:
|
|
// return
|
|
// New functionality:
|
|
// Assert if the local is not top. In product mode let the new node
|
|
// override the old entry.
|
|
assert(local == top(), "LocArray collision");
|
|
if (local == top()) {
|
|
return;
|
|
}
|
|
array->pop();
|
|
}
|
|
const Type *t = local->bottom_type();
|
|
|
|
// Is it a safepoint scalar object node?
|
|
if (local->is_SafePointScalarObject()) {
|
|
SafePointScalarObjectNode* spobj = local->as_SafePointScalarObject();
|
|
|
|
ObjectValue* sv = Compile::sv_for_node_id(objs, spobj->_idx);
|
|
if (sv == NULL) {
|
|
ciKlass* cik = t->is_oopptr()->klass();
|
|
assert(cik->is_instance_klass() ||
|
|
cik->is_array_klass(), "Not supported allocation.");
|
|
sv = new ObjectValue(spobj->_idx,
|
|
new ConstantOopWriteValue(cik->java_mirror()->constant_encoding()));
|
|
Compile::set_sv_for_object_node(objs, sv);
|
|
|
|
uint first_ind = spobj->first_index();
|
|
for (uint i = 0; i < spobj->n_fields(); i++) {
|
|
Node* fld_node = sfpt->in(first_ind+i);
|
|
(void)FillLocArray(sv->field_values()->length(), sfpt, fld_node, sv->field_values(), objs);
|
|
}
|
|
}
|
|
array->append(sv);
|
|
return;
|
|
}
|
|
|
|
// Grab the register number for the local
|
|
OptoReg::Name regnum = _regalloc->get_reg_first(local);
|
|
if( OptoReg::is_valid(regnum) ) {// Got a register/stack?
|
|
// Record the double as two float registers.
|
|
// The register mask for such a value always specifies two adjacent
|
|
// float registers, with the lower register number even.
|
|
// Normally, the allocation of high and low words to these registers
|
|
// is irrelevant, because nearly all operations on register pairs
|
|
// (e.g., StoreD) treat them as a single unit.
|
|
// Here, we assume in addition that the words in these two registers
|
|
// stored "naturally" (by operations like StoreD and double stores
|
|
// within the interpreter) such that the lower-numbered register
|
|
// is written to the lower memory address. This may seem like
|
|
// a machine dependency, but it is not--it is a requirement on
|
|
// the author of the <arch>.ad file to ensure that, for every
|
|
// even/odd double-register pair to which a double may be allocated,
|
|
// the word in the even single-register is stored to the first
|
|
// memory word. (Note that register numbers are completely
|
|
// arbitrary, and are not tied to any machine-level encodings.)
|
|
#ifdef _LP64
|
|
if( t->base() == Type::DoubleBot || t->base() == Type::DoubleCon ) {
|
|
array->append(new ConstantIntValue(0));
|
|
array->append(new_loc_value( _regalloc, regnum, Location::dbl ));
|
|
} else if ( t->base() == Type::Long ) {
|
|
array->append(new ConstantIntValue(0));
|
|
array->append(new_loc_value( _regalloc, regnum, Location::lng ));
|
|
} else if ( t->base() == Type::RawPtr ) {
|
|
// jsr/ret return address which must be restored into a the full
|
|
// width 64-bit stack slot.
|
|
array->append(new_loc_value( _regalloc, regnum, Location::lng ));
|
|
}
|
|
#else //_LP64
|
|
#ifdef SPARC
|
|
if (t->base() == Type::Long && OptoReg::is_reg(regnum)) {
|
|
// For SPARC we have to swap high and low words for
|
|
// long values stored in a single-register (g0-g7).
|
|
array->append(new_loc_value( _regalloc, regnum , Location::normal ));
|
|
array->append(new_loc_value( _regalloc, OptoReg::add(regnum,1), Location::normal ));
|
|
} else
|
|
#endif //SPARC
|
|
if( t->base() == Type::DoubleBot || t->base() == Type::DoubleCon || t->base() == Type::Long ) {
|
|
// Repack the double/long as two jints.
|
|
// The convention the interpreter uses is that the second local
|
|
// holds the first raw word of the native double representation.
|
|
// This is actually reasonable, since locals and stack arrays
|
|
// grow downwards in all implementations.
|
|
// (If, on some machine, the interpreter's Java locals or stack
|
|
// were to grow upwards, the embedded doubles would be word-swapped.)
|
|
array->append(new_loc_value( _regalloc, OptoReg::add(regnum,1), Location::normal ));
|
|
array->append(new_loc_value( _regalloc, regnum , Location::normal ));
|
|
}
|
|
#endif //_LP64
|
|
else if( (t->base() == Type::FloatBot || t->base() == Type::FloatCon) &&
|
|
OptoReg::is_reg(regnum) ) {
|
|
array->append(new_loc_value( _regalloc, regnum, Matcher::float_in_double()
|
|
? Location::float_in_dbl : Location::normal ));
|
|
} else if( t->base() == Type::Int && OptoReg::is_reg(regnum) ) {
|
|
array->append(new_loc_value( _regalloc, regnum, Matcher::int_in_long
|
|
? Location::int_in_long : Location::normal ));
|
|
} else if( t->base() == Type::NarrowOop ) {
|
|
array->append(new_loc_value( _regalloc, regnum, Location::narrowoop ));
|
|
} else {
|
|
array->append(new_loc_value( _regalloc, regnum, _regalloc->is_oop(local) ? Location::oop : Location::normal ));
|
|
}
|
|
return;
|
|
}
|
|
|
|
// No register. It must be constant data.
|
|
switch (t->base()) {
|
|
case Type::Half: // Second half of a double
|
|
ShouldNotReachHere(); // Caller should skip 2nd halves
|
|
break;
|
|
case Type::AnyPtr:
|
|
array->append(new ConstantOopWriteValue(NULL));
|
|
break;
|
|
case Type::AryPtr:
|
|
case Type::InstPtr: // fall through
|
|
array->append(new ConstantOopWriteValue(t->isa_oopptr()->const_oop()->constant_encoding()));
|
|
break;
|
|
case Type::NarrowOop:
|
|
if (t == TypeNarrowOop::NULL_PTR) {
|
|
array->append(new ConstantOopWriteValue(NULL));
|
|
} else {
|
|
array->append(new ConstantOopWriteValue(t->make_ptr()->isa_oopptr()->const_oop()->constant_encoding()));
|
|
}
|
|
break;
|
|
case Type::Int:
|
|
array->append(new ConstantIntValue(t->is_int()->get_con()));
|
|
break;
|
|
case Type::RawPtr:
|
|
// A return address (T_ADDRESS).
|
|
assert((intptr_t)t->is_ptr()->get_con() < (intptr_t)0x10000, "must be a valid BCI");
|
|
#ifdef _LP64
|
|
// Must be restored to the full-width 64-bit stack slot.
|
|
array->append(new ConstantLongValue(t->is_ptr()->get_con()));
|
|
#else
|
|
array->append(new ConstantIntValue(t->is_ptr()->get_con()));
|
|
#endif
|
|
break;
|
|
case Type::FloatCon: {
|
|
float f = t->is_float_constant()->getf();
|
|
array->append(new ConstantIntValue(jint_cast(f)));
|
|
break;
|
|
}
|
|
case Type::DoubleCon: {
|
|
jdouble d = t->is_double_constant()->getd();
|
|
#ifdef _LP64
|
|
array->append(new ConstantIntValue(0));
|
|
array->append(new ConstantDoubleValue(d));
|
|
#else
|
|
// Repack the double as two jints.
|
|
// The convention the interpreter uses is that the second local
|
|
// holds the first raw word of the native double representation.
|
|
// This is actually reasonable, since locals and stack arrays
|
|
// grow downwards in all implementations.
|
|
// (If, on some machine, the interpreter's Java locals or stack
|
|
// were to grow upwards, the embedded doubles would be word-swapped.)
|
|
jint *dp = (jint*)&d;
|
|
array->append(new ConstantIntValue(dp[1]));
|
|
array->append(new ConstantIntValue(dp[0]));
|
|
#endif
|
|
break;
|
|
}
|
|
case Type::Long: {
|
|
jlong d = t->is_long()->get_con();
|
|
#ifdef _LP64
|
|
array->append(new ConstantIntValue(0));
|
|
array->append(new ConstantLongValue(d));
|
|
#else
|
|
// Repack the long as two jints.
|
|
// The convention the interpreter uses is that the second local
|
|
// holds the first raw word of the native double representation.
|
|
// This is actually reasonable, since locals and stack arrays
|
|
// grow downwards in all implementations.
|
|
// (If, on some machine, the interpreter's Java locals or stack
|
|
// were to grow upwards, the embedded doubles would be word-swapped.)
|
|
jint *dp = (jint*)&d;
|
|
array->append(new ConstantIntValue(dp[1]));
|
|
array->append(new ConstantIntValue(dp[0]));
|
|
#endif
|
|
break;
|
|
}
|
|
case Type::Top: // Add an illegal value here
|
|
array->append(new LocationValue(Location()));
|
|
break;
|
|
default:
|
|
ShouldNotReachHere();
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Determine if this node starts a bundle
|
|
bool Compile::starts_bundle(const Node *n) const {
|
|
return (_node_bundling_limit > n->_idx &&
|
|
_node_bundling_base[n->_idx].starts_bundle());
|
|
}
|
|
|
|
//--------------------------Process_OopMap_Node--------------------------------
|
|
void Compile::Process_OopMap_Node(MachNode *mach, int current_offset) {
|
|
|
|
// Handle special safepoint nodes for synchronization
|
|
MachSafePointNode *sfn = mach->as_MachSafePoint();
|
|
MachCallNode *mcall;
|
|
|
|
#ifdef ENABLE_ZAP_DEAD_LOCALS
|
|
assert( is_node_getting_a_safepoint(mach), "logic does not match; false negative");
|
|
#endif
|
|
|
|
int safepoint_pc_offset = current_offset;
|
|
bool is_method_handle_invoke = false;
|
|
bool return_oop = false;
|
|
|
|
// Add the safepoint in the DebugInfoRecorder
|
|
if( !mach->is_MachCall() ) {
|
|
mcall = NULL;
|
|
debug_info()->add_safepoint(safepoint_pc_offset, sfn->_oop_map);
|
|
} else {
|
|
mcall = mach->as_MachCall();
|
|
|
|
// Is the call a MethodHandle call?
|
|
if (mcall->is_MachCallJava()) {
|
|
if (mcall->as_MachCallJava()->_method_handle_invoke) {
|
|
assert(has_method_handle_invokes(), "must have been set during call generation");
|
|
is_method_handle_invoke = true;
|
|
}
|
|
}
|
|
|
|
// Check if a call returns an object.
|
|
if (mcall->return_value_is_used() &&
|
|
mcall->tf()->range()->field_at(TypeFunc::Parms)->isa_ptr()) {
|
|
return_oop = true;
|
|
}
|
|
safepoint_pc_offset += mcall->ret_addr_offset();
|
|
debug_info()->add_safepoint(safepoint_pc_offset, mcall->_oop_map);
|
|
}
|
|
|
|
// Loop over the JVMState list to add scope information
|
|
// Do not skip safepoints with a NULL method, they need monitor info
|
|
JVMState* youngest_jvms = sfn->jvms();
|
|
int max_depth = youngest_jvms->depth();
|
|
|
|
// Allocate the object pool for scalar-replaced objects -- the map from
|
|
// small-integer keys (which can be recorded in the local and ostack
|
|
// arrays) to descriptions of the object state.
|
|
GrowableArray<ScopeValue*> *objs = new GrowableArray<ScopeValue*>();
|
|
|
|
// Visit scopes from oldest to youngest.
|
|
for (int depth = 1; depth <= max_depth; depth++) {
|
|
JVMState* jvms = youngest_jvms->of_depth(depth);
|
|
int idx;
|
|
ciMethod* method = jvms->has_method() ? jvms->method() : NULL;
|
|
// Safepoints that do not have method() set only provide oop-map and monitor info
|
|
// to support GC; these do not support deoptimization.
|
|
int num_locs = (method == NULL) ? 0 : jvms->loc_size();
|
|
int num_exps = (method == NULL) ? 0 : jvms->stk_size();
|
|
int num_mon = jvms->nof_monitors();
|
|
assert(method == NULL || jvms->bci() < 0 || num_locs == method->max_locals(),
|
|
"JVMS local count must match that of the method");
|
|
|
|
// Add Local and Expression Stack Information
|
|
|
|
// Insert locals into the locarray
|
|
GrowableArray<ScopeValue*> *locarray = new GrowableArray<ScopeValue*>(num_locs);
|
|
for( idx = 0; idx < num_locs; idx++ ) {
|
|
FillLocArray( idx, sfn, sfn->local(jvms, idx), locarray, objs );
|
|
}
|
|
|
|
// Insert expression stack entries into the exparray
|
|
GrowableArray<ScopeValue*> *exparray = new GrowableArray<ScopeValue*>(num_exps);
|
|
for( idx = 0; idx < num_exps; idx++ ) {
|
|
FillLocArray( idx, sfn, sfn->stack(jvms, idx), exparray, objs );
|
|
}
|
|
|
|
// Add in mappings of the monitors
|
|
assert( !method ||
|
|
!method->is_synchronized() ||
|
|
method->is_native() ||
|
|
num_mon > 0 ||
|
|
!GenerateSynchronizationCode,
|
|
"monitors must always exist for synchronized methods");
|
|
|
|
// Build the growable array of ScopeValues for exp stack
|
|
GrowableArray<MonitorValue*> *monarray = new GrowableArray<MonitorValue*>(num_mon);
|
|
|
|
// Loop over monitors and insert into array
|
|
for(idx = 0; idx < num_mon; idx++) {
|
|
// Grab the node that defines this monitor
|
|
Node* box_node = sfn->monitor_box(jvms, idx);
|
|
Node* obj_node = sfn->monitor_obj(jvms, idx);
|
|
|
|
// Create ScopeValue for object
|
|
ScopeValue *scval = NULL;
|
|
|
|
if( obj_node->is_SafePointScalarObject() ) {
|
|
SafePointScalarObjectNode* spobj = obj_node->as_SafePointScalarObject();
|
|
scval = Compile::sv_for_node_id(objs, spobj->_idx);
|
|
if (scval == NULL) {
|
|
const Type *t = obj_node->bottom_type();
|
|
ciKlass* cik = t->is_oopptr()->klass();
|
|
assert(cik->is_instance_klass() ||
|
|
cik->is_array_klass(), "Not supported allocation.");
|
|
ObjectValue* sv = new ObjectValue(spobj->_idx,
|
|
new ConstantOopWriteValue(cik->java_mirror()->constant_encoding()));
|
|
Compile::set_sv_for_object_node(objs, sv);
|
|
|
|
uint first_ind = spobj->first_index();
|
|
for (uint i = 0; i < spobj->n_fields(); i++) {
|
|
Node* fld_node = sfn->in(first_ind+i);
|
|
(void)FillLocArray(sv->field_values()->length(), sfn, fld_node, sv->field_values(), objs);
|
|
}
|
|
scval = sv;
|
|
}
|
|
} else if( !obj_node->is_Con() ) {
|
|
OptoReg::Name obj_reg = _regalloc->get_reg_first(obj_node);
|
|
if( obj_node->bottom_type()->base() == Type::NarrowOop ) {
|
|
scval = new_loc_value( _regalloc, obj_reg, Location::narrowoop );
|
|
} else {
|
|
scval = new_loc_value( _regalloc, obj_reg, Location::oop );
|
|
}
|
|
} else {
|
|
const TypePtr *tp = obj_node->bottom_type()->make_ptr();
|
|
scval = new ConstantOopWriteValue(tp->is_oopptr()->const_oop()->constant_encoding());
|
|
}
|
|
|
|
OptoReg::Name box_reg = BoxLockNode::reg(box_node);
|
|
Location basic_lock = Location::new_stk_loc(Location::normal,_regalloc->reg2offset(box_reg));
|
|
bool eliminated = (box_node->is_BoxLock() && box_node->as_BoxLock()->is_eliminated());
|
|
monarray->append(new MonitorValue(scval, basic_lock, eliminated));
|
|
}
|
|
|
|
// We dump the object pool first, since deoptimization reads it in first.
|
|
debug_info()->dump_object_pool(objs);
|
|
|
|
// Build first class objects to pass to scope
|
|
DebugToken *locvals = debug_info()->create_scope_values(locarray);
|
|
DebugToken *expvals = debug_info()->create_scope_values(exparray);
|
|
DebugToken *monvals = debug_info()->create_monitor_values(monarray);
|
|
|
|
// Make method available for all Safepoints
|
|
ciMethod* scope_method = method ? method : _method;
|
|
// Describe the scope here
|
|
assert(jvms->bci() >= InvocationEntryBci && jvms->bci() <= 0x10000, "must be a valid or entry BCI");
|
|
assert(!jvms->should_reexecute() || depth == max_depth, "reexecute allowed only for the youngest");
|
|
// Now we can describe the scope.
|
|
debug_info()->describe_scope(safepoint_pc_offset, scope_method, jvms->bci(), jvms->should_reexecute(), is_method_handle_invoke, return_oop, locvals, expvals, monvals);
|
|
} // End jvms loop
|
|
|
|
// Mark the end of the scope set.
|
|
debug_info()->end_safepoint(safepoint_pc_offset);
|
|
}
|
|
|
|
|
|
|
|
// A simplified version of Process_OopMap_Node, to handle non-safepoints.
|
|
class NonSafepointEmitter {
|
|
Compile* C;
|
|
JVMState* _pending_jvms;
|
|
int _pending_offset;
|
|
|
|
void emit_non_safepoint();
|
|
|
|
public:
|
|
NonSafepointEmitter(Compile* compile) {
|
|
this->C = compile;
|
|
_pending_jvms = NULL;
|
|
_pending_offset = 0;
|
|
}
|
|
|
|
void observe_instruction(Node* n, int pc_offset) {
|
|
if (!C->debug_info()->recording_non_safepoints()) return;
|
|
|
|
Node_Notes* nn = C->node_notes_at(n->_idx);
|
|
if (nn == NULL || nn->jvms() == NULL) return;
|
|
if (_pending_jvms != NULL &&
|
|
_pending_jvms->same_calls_as(nn->jvms())) {
|
|
// Repeated JVMS? Stretch it up here.
|
|
_pending_offset = pc_offset;
|
|
} else {
|
|
if (_pending_jvms != NULL &&
|
|
_pending_offset < pc_offset) {
|
|
emit_non_safepoint();
|
|
}
|
|
_pending_jvms = NULL;
|
|
if (pc_offset > C->debug_info()->last_pc_offset()) {
|
|
// This is the only way _pending_jvms can become non-NULL:
|
|
_pending_jvms = nn->jvms();
|
|
_pending_offset = pc_offset;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Stay out of the way of real safepoints:
|
|
void observe_safepoint(JVMState* jvms, int pc_offset) {
|
|
if (_pending_jvms != NULL &&
|
|
!_pending_jvms->same_calls_as(jvms) &&
|
|
_pending_offset < pc_offset) {
|
|
emit_non_safepoint();
|
|
}
|
|
_pending_jvms = NULL;
|
|
}
|
|
|
|
void flush_at_end() {
|
|
if (_pending_jvms != NULL) {
|
|
emit_non_safepoint();
|
|
}
|
|
_pending_jvms = NULL;
|
|
}
|
|
};
|
|
|
|
void NonSafepointEmitter::emit_non_safepoint() {
|
|
JVMState* youngest_jvms = _pending_jvms;
|
|
int pc_offset = _pending_offset;
|
|
|
|
// Clear it now:
|
|
_pending_jvms = NULL;
|
|
|
|
DebugInformationRecorder* debug_info = C->debug_info();
|
|
assert(debug_info->recording_non_safepoints(), "sanity");
|
|
|
|
debug_info->add_non_safepoint(pc_offset);
|
|
int max_depth = youngest_jvms->depth();
|
|
|
|
// Visit scopes from oldest to youngest.
|
|
for (int depth = 1; depth <= max_depth; depth++) {
|
|
JVMState* jvms = youngest_jvms->of_depth(depth);
|
|
ciMethod* method = jvms->has_method() ? jvms->method() : NULL;
|
|
assert(!jvms->should_reexecute() || depth==max_depth, "reexecute allowed only for the youngest");
|
|
debug_info->describe_scope(pc_offset, method, jvms->bci(), jvms->should_reexecute());
|
|
}
|
|
|
|
// Mark the end of the scope set.
|
|
debug_info->end_non_safepoint(pc_offset);
|
|
}
|
|
|
|
|
|
|
|
// helper for fill_buffer bailout logic
|
|
static void turn_off_compiler(Compile* C) {
|
|
if (CodeCache::largest_free_block() >= CodeCacheMinimumFreeSpace*10) {
|
|
// Do not turn off compilation if a single giant method has
|
|
// blown the code cache size.
|
|
C->record_failure("excessive request to CodeCache");
|
|
} else {
|
|
// Let CompilerBroker disable further compilations.
|
|
C->record_failure("CodeCache is full");
|
|
}
|
|
}
|
|
|
|
|
|
//------------------------------init_buffer------------------------------------
|
|
CodeBuffer* Compile::init_buffer(uint* blk_starts) {
|
|
|
|
// Set the initially allocated size
|
|
int code_req = initial_code_capacity;
|
|
int locs_req = initial_locs_capacity;
|
|
int stub_req = TraceJumps ? initial_stub_capacity * 10 : initial_stub_capacity;
|
|
int const_req = initial_const_capacity;
|
|
|
|
int pad_req = NativeCall::instruction_size;
|
|
// The extra spacing after the code is necessary on some platforms.
|
|
// Sometimes we need to patch in a jump after the last instruction,
|
|
// if the nmethod has been deoptimized. (See 4932387, 4894843.)
|
|
|
|
// Compute the byte offset where we can store the deopt pc.
|
|
if (fixed_slots() != 0) {
|
|
_orig_pc_slot_offset_in_bytes = _regalloc->reg2offset(OptoReg::stack2reg(_orig_pc_slot));
|
|
}
|
|
|
|
// Compute prolog code size
|
|
_method_size = 0;
|
|
_frame_slots = OptoReg::reg2stack(_matcher->_old_SP)+_regalloc->_framesize;
|
|
#ifdef IA64
|
|
if (save_argument_registers()) {
|
|
// 4815101: this is a stub with implicit and unknown precision fp args.
|
|
// The usual spill mechanism can only generate stfd's in this case, which
|
|
// doesn't work if the fp reg to spill contains a single-precision denorm.
|
|
// Instead, we hack around the normal spill mechanism using stfspill's and
|
|
// ldffill's in the MachProlog and MachEpilog emit methods. We allocate
|
|
// space here for the fp arg regs (f8-f15) we're going to thusly spill.
|
|
//
|
|
// If we ever implement 16-byte 'registers' == stack slots, we can
|
|
// get rid of this hack and have SpillCopy generate stfspill/ldffill
|
|
// instead of stfd/stfs/ldfd/ldfs.
|
|
_frame_slots += 8*(16/BytesPerInt);
|
|
}
|
|
#endif
|
|
assert(_frame_slots >= 0 && _frame_slots < 1000000, "sanity check");
|
|
|
|
if (has_mach_constant_base_node()) {
|
|
// Fill the constant table.
|
|
// Note: This must happen before shorten_branches.
|
|
for (uint i = 0; i < _cfg->_num_blocks; i++) {
|
|
Block* b = _cfg->_blocks[i];
|
|
|
|
for (uint j = 0; j < b->_nodes.size(); j++) {
|
|
Node* n = b->_nodes[j];
|
|
|
|
// If the node is a MachConstantNode evaluate the constant
|
|
// value section.
|
|
if (n->is_MachConstant()) {
|
|
MachConstantNode* machcon = n->as_MachConstant();
|
|
machcon->eval_constant(C);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Calculate the offsets of the constants and the size of the
|
|
// constant table (including the padding to the next section).
|
|
constant_table().calculate_offsets_and_size();
|
|
const_req = constant_table().size();
|
|
}
|
|
|
|
// Initialize the space for the BufferBlob used to find and verify
|
|
// instruction size in MachNode::emit_size()
|
|
init_scratch_buffer_blob(const_req);
|
|
if (failing()) return NULL; // Out of memory
|
|
|
|
// Pre-compute the length of blocks and replace
|
|
// long branches with short if machine supports it.
|
|
shorten_branches(blk_starts, code_req, locs_req, stub_req);
|
|
|
|
// nmethod and CodeBuffer count stubs & constants as part of method's code.
|
|
int exception_handler_req = size_exception_handler();
|
|
int deopt_handler_req = size_deopt_handler();
|
|
exception_handler_req += MAX_stubs_size; // add marginal slop for handler
|
|
deopt_handler_req += MAX_stubs_size; // add marginal slop for handler
|
|
stub_req += MAX_stubs_size; // ensure per-stub margin
|
|
code_req += MAX_inst_size; // ensure per-instruction margin
|
|
|
|
if (StressCodeBuffers)
|
|
code_req = const_req = stub_req = exception_handler_req = deopt_handler_req = 0x10; // force expansion
|
|
|
|
int total_req =
|
|
const_req +
|
|
code_req +
|
|
pad_req +
|
|
stub_req +
|
|
exception_handler_req +
|
|
deopt_handler_req; // deopt handler
|
|
|
|
if (has_method_handle_invokes())
|
|
total_req += deopt_handler_req; // deopt MH handler
|
|
|
|
CodeBuffer* cb = code_buffer();
|
|
cb->initialize(total_req, locs_req);
|
|
|
|
// Have we run out of code space?
|
|
if ((cb->blob() == NULL) || (!CompileBroker::should_compile_new_jobs())) {
|
|
turn_off_compiler(this);
|
|
return NULL;
|
|
}
|
|
// Configure the code buffer.
|
|
cb->initialize_consts_size(const_req);
|
|
cb->initialize_stubs_size(stub_req);
|
|
cb->initialize_oop_recorder(env()->oop_recorder());
|
|
|
|
// fill in the nop array for bundling computations
|
|
MachNode *_nop_list[Bundle::_nop_count];
|
|
Bundle::initialize_nops(_nop_list, this);
|
|
|
|
return cb;
|
|
}
|
|
|
|
//------------------------------fill_buffer------------------------------------
|
|
void Compile::fill_buffer(CodeBuffer* cb, uint* blk_starts) {
|
|
// blk_starts[] contains offsets calculated during short branches processing,
|
|
// offsets should not be increased during following steps.
|
|
|
|
// Compute the size of first NumberOfLoopInstrToAlign instructions at head
|
|
// of a loop. It is used to determine the padding for loop alignment.
|
|
compute_loop_first_inst_sizes();
|
|
|
|
// Create oopmap set.
|
|
_oop_map_set = new OopMapSet();
|
|
|
|
// !!!!! This preserves old handling of oopmaps for now
|
|
debug_info()->set_oopmaps(_oop_map_set);
|
|
|
|
uint nblocks = _cfg->_num_blocks;
|
|
// Count and start of implicit null check instructions
|
|
uint inct_cnt = 0;
|
|
uint *inct_starts = NEW_RESOURCE_ARRAY(uint, nblocks+1);
|
|
|
|
// Count and start of calls
|
|
uint *call_returns = NEW_RESOURCE_ARRAY(uint, nblocks+1);
|
|
|
|
uint return_offset = 0;
|
|
int nop_size = (new (this) MachNopNode())->size(_regalloc);
|
|
|
|
int previous_offset = 0;
|
|
int current_offset = 0;
|
|
int last_call_offset = -1;
|
|
int last_avoid_back_to_back_offset = -1;
|
|
#ifdef ASSERT
|
|
int block_alignment_padding = 0;
|
|
|
|
uint* jmp_target = NEW_RESOURCE_ARRAY(uint,nblocks);
|
|
uint* jmp_offset = NEW_RESOURCE_ARRAY(uint,nblocks);
|
|
uint* jmp_size = NEW_RESOURCE_ARRAY(uint,nblocks);
|
|
uint* jmp_rule = NEW_RESOURCE_ARRAY(uint,nblocks);
|
|
#endif
|
|
|
|
// Create an array of unused labels, one for each basic block, if printing is enabled
|
|
#ifndef PRODUCT
|
|
int *node_offsets = NULL;
|
|
uint node_offset_limit = unique();
|
|
|
|
if (print_assembly())
|
|
node_offsets = NEW_RESOURCE_ARRAY(int, node_offset_limit);
|
|
#endif
|
|
|
|
NonSafepointEmitter non_safepoints(this); // emit non-safepoints lazily
|
|
|
|
// Emit the constant table.
|
|
if (has_mach_constant_base_node()) {
|
|
constant_table().emit(*cb);
|
|
}
|
|
|
|
// Create an array of labels, one for each basic block
|
|
Label *blk_labels = NEW_RESOURCE_ARRAY(Label, nblocks+1);
|
|
for (uint i=0; i <= nblocks; i++) {
|
|
blk_labels[i].init();
|
|
}
|
|
|
|
// ------------------
|
|
// Now fill in the code buffer
|
|
Node *delay_slot = NULL;
|
|
|
|
for (uint i=0; i < nblocks; i++) {
|
|
guarantee(blk_starts[i] >= (uint)cb->insts_size(),"should not increase size");
|
|
|
|
Block *b = _cfg->_blocks[i];
|
|
|
|
Node *head = b->head();
|
|
|
|
// If this block needs to start aligned (i.e, can be reached other
|
|
// than by falling-thru from the previous block), then force the
|
|
// start of a new bundle.
|
|
if (Pipeline::requires_bundling() && starts_bundle(head))
|
|
cb->flush_bundle(true);
|
|
|
|
#ifdef ASSERT
|
|
if (!b->is_connector()) {
|
|
stringStream st;
|
|
b->dump_head(&_cfg->_bbs, &st);
|
|
MacroAssembler(cb).block_comment(st.as_string());
|
|
}
|
|
jmp_target[i] = 0;
|
|
jmp_offset[i] = 0;
|
|
jmp_size[i] = 0;
|
|
jmp_rule[i] = 0;
|
|
|
|
// Maximum alignment padding for loop block was used
|
|
// during first round of branches shortening, as result
|
|
// padding for nodes (sfpt after call) was not added.
|
|
// Take this into account for block's size change check
|
|
// and allow increase block's size by the difference
|
|
// of maximum and actual alignment paddings.
|
|
int orig_blk_size = blk_starts[i+1] - blk_starts[i] + block_alignment_padding;
|
|
#endif
|
|
int blk_offset = current_offset;
|
|
|
|
// Define the label at the beginning of the basic block
|
|
MacroAssembler(cb).bind(blk_labels[b->_pre_order]);
|
|
|
|
uint last_inst = b->_nodes.size();
|
|
|
|
// Emit block normally, except for last instruction.
|
|
// Emit means "dump code bits into code buffer".
|
|
for (uint j = 0; j<last_inst; j++) {
|
|
|
|
// Get the node
|
|
Node* n = b->_nodes[j];
|
|
|
|
// See if delay slots are supported
|
|
if (valid_bundle_info(n) &&
|
|
node_bundling(n)->used_in_unconditional_delay()) {
|
|
assert(delay_slot == NULL, "no use of delay slot node");
|
|
assert(n->size(_regalloc) == Pipeline::instr_unit_size(), "delay slot instruction wrong size");
|
|
|
|
delay_slot = n;
|
|
continue;
|
|
}
|
|
|
|
// If this starts a new instruction group, then flush the current one
|
|
// (but allow split bundles)
|
|
if (Pipeline::requires_bundling() && starts_bundle(n))
|
|
cb->flush_bundle(false);
|
|
|
|
// The following logic is duplicated in the code ifdeffed for
|
|
// ENABLE_ZAP_DEAD_LOCALS which appears above in this file. It
|
|
// should be factored out. Or maybe dispersed to the nodes?
|
|
|
|
// Special handling for SafePoint/Call Nodes
|
|
bool is_mcall = false;
|
|
if (n->is_Mach()) {
|
|
MachNode *mach = n->as_Mach();
|
|
is_mcall = n->is_MachCall();
|
|
bool is_sfn = n->is_MachSafePoint();
|
|
|
|
// If this requires all previous instructions be flushed, then do so
|
|
if (is_sfn || is_mcall || mach->alignment_required() != 1) {
|
|
cb->flush_bundle(true);
|
|
current_offset = cb->insts_size();
|
|
}
|
|
|
|
// A padding may be needed again since a previous instruction
|
|
// could be moved to delay slot.
|
|
|
|
// align the instruction if necessary
|
|
int padding = mach->compute_padding(current_offset);
|
|
// Make sure safepoint node for polling is distinct from a call's
|
|
// return by adding a nop if needed.
|
|
if (is_sfn && !is_mcall && padding == 0 && current_offset == last_call_offset) {
|
|
padding = nop_size;
|
|
}
|
|
if (padding == 0 && mach->avoid_back_to_back() &&
|
|
current_offset == last_avoid_back_to_back_offset) {
|
|
// Avoid back to back some instructions.
|
|
padding = nop_size;
|
|
}
|
|
|
|
if(padding > 0) {
|
|
assert((padding % nop_size) == 0, "padding is not a multiple of NOP size");
|
|
int nops_cnt = padding / nop_size;
|
|
MachNode *nop = new (this) MachNopNode(nops_cnt);
|
|
b->_nodes.insert(j++, nop);
|
|
last_inst++;
|
|
_cfg->_bbs.map( nop->_idx, b );
|
|
nop->emit(*cb, _regalloc);
|
|
cb->flush_bundle(true);
|
|
current_offset = cb->insts_size();
|
|
}
|
|
|
|
// Remember the start of the last call in a basic block
|
|
if (is_mcall) {
|
|
MachCallNode *mcall = mach->as_MachCall();
|
|
|
|
// This destination address is NOT PC-relative
|
|
mcall->method_set((intptr_t)mcall->entry_point());
|
|
|
|
// Save the return address
|
|
call_returns[b->_pre_order] = current_offset + mcall->ret_addr_offset();
|
|
|
|
if (mcall->is_MachCallLeaf()) {
|
|
is_mcall = false;
|
|
is_sfn = false;
|
|
}
|
|
}
|
|
|
|
// sfn will be valid whenever mcall is valid now because of inheritance
|
|
if (is_sfn || is_mcall) {
|
|
|
|
// Handle special safepoint nodes for synchronization
|
|
if (!is_mcall) {
|
|
MachSafePointNode *sfn = mach->as_MachSafePoint();
|
|
// !!!!! Stubs only need an oopmap right now, so bail out
|
|
if (sfn->jvms()->method() == NULL) {
|
|
// Write the oopmap directly to the code blob??!!
|
|
# ifdef ENABLE_ZAP_DEAD_LOCALS
|
|
assert( !is_node_getting_a_safepoint(sfn), "logic does not match; false positive");
|
|
# endif
|
|
continue;
|
|
}
|
|
} // End synchronization
|
|
|
|
non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(),
|
|
current_offset);
|
|
Process_OopMap_Node(mach, current_offset);
|
|
} // End if safepoint
|
|
|
|
// If this is a null check, then add the start of the previous instruction to the list
|
|
else if( mach->is_MachNullCheck() ) {
|
|
inct_starts[inct_cnt++] = previous_offset;
|
|
}
|
|
|
|
// If this is a branch, then fill in the label with the target BB's label
|
|
else if (mach->is_MachBranch()) {
|
|
// This requires the TRUE branch target be in succs[0]
|
|
uint block_num = b->non_connector_successor(0)->_pre_order;
|
|
|
|
// Try to replace long branch if delay slot is not used,
|
|
// it is mostly for back branches since forward branch's
|
|
// distance is not updated yet.
|
|
bool delay_slot_is_used = valid_bundle_info(n) &&
|
|
node_bundling(n)->use_unconditional_delay();
|
|
if (!delay_slot_is_used && mach->may_be_short_branch()) {
|
|
assert(delay_slot == NULL, "not expecting delay slot node");
|
|
int br_size = n->size(_regalloc);
|
|
int offset = blk_starts[block_num] - current_offset;
|
|
if (block_num >= i) {
|
|
// Current and following block's offset are not
|
|
// finilized yet, adjust distance by the difference
|
|
// between calculated and final offsets of current block.
|
|
offset -= (blk_starts[i] - blk_offset);
|
|
}
|
|
// In the following code a nop could be inserted before
|
|
// the branch which will increase the backward distance.
|
|
bool needs_padding = (current_offset == last_avoid_back_to_back_offset);
|
|
if (needs_padding && offset <= 0)
|
|
offset -= nop_size;
|
|
|
|
if (_matcher->is_short_branch_offset(mach->rule(), br_size, offset)) {
|
|
// We've got a winner. Replace this branch.
|
|
MachNode* replacement = mach->as_MachBranch()->short_branch_version(this);
|
|
|
|
// Update the jmp_size.
|
|
int new_size = replacement->size(_regalloc);
|
|
assert((br_size - new_size) >= (int)nop_size, "short_branch size should be smaller");
|
|
// Insert padding between avoid_back_to_back branches.
|
|
if (needs_padding && replacement->avoid_back_to_back()) {
|
|
MachNode *nop = new (this) MachNopNode();
|
|
b->_nodes.insert(j++, nop);
|
|
_cfg->_bbs.map(nop->_idx, b);
|
|
last_inst++;
|
|
nop->emit(*cb, _regalloc);
|
|
cb->flush_bundle(true);
|
|
current_offset = cb->insts_size();
|
|
}
|
|
#ifdef ASSERT
|
|
jmp_target[i] = block_num;
|
|
jmp_offset[i] = current_offset - blk_offset;
|
|
jmp_size[i] = new_size;
|
|
jmp_rule[i] = mach->rule();
|
|
#endif
|
|
b->_nodes.map(j, replacement);
|
|
mach->subsume_by(replacement, C);
|
|
n = replacement;
|
|
mach = replacement;
|
|
}
|
|
}
|
|
mach->as_MachBranch()->label_set( &blk_labels[block_num], block_num );
|
|
} else if (mach->ideal_Opcode() == Op_Jump) {
|
|
for (uint h = 0; h < b->_num_succs; h++) {
|
|
Block* succs_block = b->_succs[h];
|
|
for (uint j = 1; j < succs_block->num_preds(); j++) {
|
|
Node* jpn = succs_block->pred(j);
|
|
if (jpn->is_JumpProj() && jpn->in(0) == mach) {
|
|
uint block_num = succs_block->non_connector()->_pre_order;
|
|
Label *blkLabel = &blk_labels[block_num];
|
|
mach->add_case_label(jpn->as_JumpProj()->proj_no(), blkLabel);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef ASSERT
|
|
// Check that oop-store precedes the card-mark
|
|
else if (mach->ideal_Opcode() == Op_StoreCM) {
|
|
uint storeCM_idx = j;
|
|
int count = 0;
|
|
for (uint prec = mach->req(); prec < mach->len(); prec++) {
|
|
Node *oop_store = mach->in(prec); // Precedence edge
|
|
if (oop_store == NULL) continue;
|
|
count++;
|
|
uint i4;
|
|
for( i4 = 0; i4 < last_inst; ++i4 ) {
|
|
if( b->_nodes[i4] == oop_store ) break;
|
|
}
|
|
// Note: This test can provide a false failure if other precedence
|
|
// edges have been added to the storeCMNode.
|
|
assert( i4 == last_inst || i4 < storeCM_idx, "CM card-mark executes before oop-store");
|
|
}
|
|
assert(count > 0, "storeCM expects at least one precedence edge");
|
|
}
|
|
#endif
|
|
|
|
else if (!n->is_Proj()) {
|
|
// Remember the beginning of the previous instruction, in case
|
|
// it's followed by a flag-kill and a null-check. Happens on
|
|
// Intel all the time, with add-to-memory kind of opcodes.
|
|
previous_offset = current_offset;
|
|
}
|
|
}
|
|
|
|
// Verify that there is sufficient space remaining
|
|
cb->insts()->maybe_expand_to_ensure_remaining(MAX_inst_size);
|
|
if ((cb->blob() == NULL) || (!CompileBroker::should_compile_new_jobs())) {
|
|
turn_off_compiler(this);
|
|
return;
|
|
}
|
|
|
|
// Save the offset for the listing
|
|
#ifndef PRODUCT
|
|
if (node_offsets && n->_idx < node_offset_limit)
|
|
node_offsets[n->_idx] = cb->insts_size();
|
|
#endif
|
|
|
|
// "Normal" instruction case
|
|
DEBUG_ONLY( uint instr_offset = cb->insts_size(); )
|
|
n->emit(*cb, _regalloc);
|
|
current_offset = cb->insts_size();
|
|
|
|
#ifdef ASSERT
|
|
if (n->size(_regalloc) < (current_offset-instr_offset)) {
|
|
n->dump();
|
|
assert(false, "wrong size of mach node");
|
|
}
|
|
#endif
|
|
non_safepoints.observe_instruction(n, current_offset);
|
|
|
|
// mcall is last "call" that can be a safepoint
|
|
// record it so we can see if a poll will directly follow it
|
|
// in which case we'll need a pad to make the PcDesc sites unique
|
|
// see 5010568. This can be slightly inaccurate but conservative
|
|
// in the case that return address is not actually at current_offset.
|
|
// This is a small price to pay.
|
|
|
|
if (is_mcall) {
|
|
last_call_offset = current_offset;
|
|
}
|
|
|
|
if (n->is_Mach() && n->as_Mach()->avoid_back_to_back()) {
|
|
// Avoid back to back some instructions.
|
|
last_avoid_back_to_back_offset = current_offset;
|
|
}
|
|
|
|
// See if this instruction has a delay slot
|
|
if (valid_bundle_info(n) && node_bundling(n)->use_unconditional_delay()) {
|
|
assert(delay_slot != NULL, "expecting delay slot node");
|
|
|
|
// Back up 1 instruction
|
|
cb->set_insts_end(cb->insts_end() - Pipeline::instr_unit_size());
|
|
|
|
// Save the offset for the listing
|
|
#ifndef PRODUCT
|
|
if (node_offsets && delay_slot->_idx < node_offset_limit)
|
|
node_offsets[delay_slot->_idx] = cb->insts_size();
|
|
#endif
|
|
|
|
// Support a SafePoint in the delay slot
|
|
if (delay_slot->is_MachSafePoint()) {
|
|
MachNode *mach = delay_slot->as_Mach();
|
|
// !!!!! Stubs only need an oopmap right now, so bail out
|
|
if (!mach->is_MachCall() && mach->as_MachSafePoint()->jvms()->method() == NULL) {
|
|
// Write the oopmap directly to the code blob??!!
|
|
# ifdef ENABLE_ZAP_DEAD_LOCALS
|
|
assert( !is_node_getting_a_safepoint(mach), "logic does not match; false positive");
|
|
# endif
|
|
delay_slot = NULL;
|
|
continue;
|
|
}
|
|
|
|
int adjusted_offset = current_offset - Pipeline::instr_unit_size();
|
|
non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(),
|
|
adjusted_offset);
|
|
// Generate an OopMap entry
|
|
Process_OopMap_Node(mach, adjusted_offset);
|
|
}
|
|
|
|
// Insert the delay slot instruction
|
|
delay_slot->emit(*cb, _regalloc);
|
|
|
|
// Don't reuse it
|
|
delay_slot = NULL;
|
|
}
|
|
|
|
} // End for all instructions in block
|
|
assert((uint)blk_offset <= blk_starts[i], "shouldn't increase distance");
|
|
blk_starts[i] = blk_offset;
|
|
|
|
// If the next block is the top of a loop, pad this block out to align
|
|
// the loop top a little. Helps prevent pipe stalls at loop back branches.
|
|
if (i < nblocks-1) {
|
|
Block *nb = _cfg->_blocks[i+1];
|
|
int padding = nb->alignment_padding(current_offset);
|
|
if( padding > 0 ) {
|
|
MachNode *nop = new (this) MachNopNode(padding / nop_size);
|
|
b->_nodes.insert( b->_nodes.size(), nop );
|
|
_cfg->_bbs.map( nop->_idx, b );
|
|
nop->emit(*cb, _regalloc);
|
|
current_offset = cb->insts_size();
|
|
}
|
|
#ifdef ASSERT
|
|
int max_loop_pad = nb->code_alignment()-relocInfo::addr_unit();
|
|
block_alignment_padding = (max_loop_pad - padding);
|
|
assert(block_alignment_padding >= 0, "sanity");
|
|
#endif
|
|
}
|
|
// Verify that the distance for generated before forward
|
|
// short branches is still valid.
|
|
assert(orig_blk_size >= (current_offset - blk_offset), "shouldn't increase block size");
|
|
|
|
} // End of for all blocks
|
|
blk_starts[nblocks] = current_offset;
|
|
|
|
non_safepoints.flush_at_end();
|
|
|
|
// Offset too large?
|
|
if (failing()) return;
|
|
|
|
// Define a pseudo-label at the end of the code
|
|
MacroAssembler(cb).bind( blk_labels[nblocks] );
|
|
|
|
// Compute the size of the first block
|
|
_first_block_size = blk_labels[1].loc_pos() - blk_labels[0].loc_pos();
|
|
|
|
assert(cb->insts_size() < 500000, "method is unreasonably large");
|
|
|
|
#ifdef ASSERT
|
|
for (uint i = 0; i < nblocks; i++) { // For all blocks
|
|
if (jmp_target[i] != 0) {
|
|
int br_size = jmp_size[i];
|
|
int offset = blk_starts[jmp_target[i]]-(blk_starts[i] + jmp_offset[i]);
|
|
if (!_matcher->is_short_branch_offset(jmp_rule[i], br_size, offset)) {
|
|
tty->print_cr("target (%d) - jmp_offset(%d) = offset (%d), jump_size(%d), jmp_block B%d, target_block B%d", blk_starts[jmp_target[i]], blk_starts[i] + jmp_offset[i], offset, br_size, i, jmp_target[i]);
|
|
assert(false, "Displacement too large for short jmp");
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
// ------------------
|
|
|
|
#ifndef PRODUCT
|
|
// Information on the size of the method, without the extraneous code
|
|
Scheduling::increment_method_size(cb->insts_size());
|
|
#endif
|
|
|
|
// ------------------
|
|
// Fill in exception table entries.
|
|
FillExceptionTables(inct_cnt, call_returns, inct_starts, blk_labels);
|
|
|
|
// Only java methods have exception handlers and deopt handlers
|
|
if (_method) {
|
|
// Emit the exception handler code.
|
|
_code_offsets.set_value(CodeOffsets::Exceptions, emit_exception_handler(*cb));
|
|
// Emit the deopt handler code.
|
|
_code_offsets.set_value(CodeOffsets::Deopt, emit_deopt_handler(*cb));
|
|
|
|
// Emit the MethodHandle deopt handler code (if required).
|
|
if (has_method_handle_invokes()) {
|
|
// We can use the same code as for the normal deopt handler, we
|
|
// just need a different entry point address.
|
|
_code_offsets.set_value(CodeOffsets::DeoptMH, emit_deopt_handler(*cb));
|
|
}
|
|
}
|
|
|
|
// One last check for failed CodeBuffer::expand:
|
|
if ((cb->blob() == NULL) || (!CompileBroker::should_compile_new_jobs())) {
|
|
turn_off_compiler(this);
|
|
return;
|
|
}
|
|
|
|
#ifndef PRODUCT
|
|
// Dump the assembly code, including basic-block numbers
|
|
if (print_assembly()) {
|
|
ttyLocker ttyl; // keep the following output all in one block
|
|
if (!VMThread::should_terminate()) { // test this under the tty lock
|
|
// This output goes directly to the tty, not the compiler log.
|
|
// To enable tools to match it up with the compilation activity,
|
|
// be sure to tag this tty output with the compile ID.
|
|
if (xtty != NULL) {
|
|
xtty->head("opto_assembly compile_id='%d'%s", compile_id(),
|
|
is_osr_compilation() ? " compile_kind='osr'" :
|
|
"");
|
|
}
|
|
if (method() != NULL) {
|
|
method()->print_metadata();
|
|
}
|
|
dump_asm(node_offsets, node_offset_limit);
|
|
if (xtty != NULL) {
|
|
xtty->tail("opto_assembly");
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
}
|
|
|
|
void Compile::FillExceptionTables(uint cnt, uint *call_returns, uint *inct_starts, Label *blk_labels) {
|
|
_inc_table.set_size(cnt);
|
|
|
|
uint inct_cnt = 0;
|
|
for( uint i=0; i<_cfg->_num_blocks; i++ ) {
|
|
Block *b = _cfg->_blocks[i];
|
|
Node *n = NULL;
|
|
int j;
|
|
|
|
// Find the branch; ignore trailing NOPs.
|
|
for( j = b->_nodes.size()-1; j>=0; j-- ) {
|
|
n = b->_nodes[j];
|
|
if( !n->is_Mach() || n->as_Mach()->ideal_Opcode() != Op_Con )
|
|
break;
|
|
}
|
|
|
|
// If we didn't find anything, continue
|
|
if( j < 0 ) continue;
|
|
|
|
// Compute ExceptionHandlerTable subtable entry and add it
|
|
// (skip empty blocks)
|
|
if( n->is_Catch() ) {
|
|
|
|
// Get the offset of the return from the call
|
|
uint call_return = call_returns[b->_pre_order];
|
|
#ifdef ASSERT
|
|
assert( call_return > 0, "no call seen for this basic block" );
|
|
while( b->_nodes[--j]->is_MachProj() ) ;
|
|
assert( b->_nodes[j]->is_MachCall(), "CatchProj must follow call" );
|
|
#endif
|
|
// last instruction is a CatchNode, find it's CatchProjNodes
|
|
int nof_succs = b->_num_succs;
|
|
// allocate space
|
|
GrowableArray<intptr_t> handler_bcis(nof_succs);
|
|
GrowableArray<intptr_t> handler_pcos(nof_succs);
|
|
// iterate through all successors
|
|
for (int j = 0; j < nof_succs; j++) {
|
|
Block* s = b->_succs[j];
|
|
bool found_p = false;
|
|
for( uint k = 1; k < s->num_preds(); k++ ) {
|
|
Node *pk = s->pred(k);
|
|
if( pk->is_CatchProj() && pk->in(0) == n ) {
|
|
const CatchProjNode* p = pk->as_CatchProj();
|
|
found_p = true;
|
|
// add the corresponding handler bci & pco information
|
|
if( p->_con != CatchProjNode::fall_through_index ) {
|
|
// p leads to an exception handler (and is not fall through)
|
|
assert(s == _cfg->_blocks[s->_pre_order],"bad numbering");
|
|
// no duplicates, please
|
|
if( !handler_bcis.contains(p->handler_bci()) ) {
|
|
uint block_num = s->non_connector()->_pre_order;
|
|
handler_bcis.append(p->handler_bci());
|
|
handler_pcos.append(blk_labels[block_num].loc_pos());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
assert(found_p, "no matching predecessor found");
|
|
// Note: Due to empty block removal, one block may have
|
|
// several CatchProj inputs, from the same Catch.
|
|
}
|
|
|
|
// Set the offset of the return from the call
|
|
_handler_table.add_subtable(call_return, &handler_bcis, NULL, &handler_pcos);
|
|
continue;
|
|
}
|
|
|
|
// Handle implicit null exception table updates
|
|
if( n->is_MachNullCheck() ) {
|
|
uint block_num = b->non_connector_successor(0)->_pre_order;
|
|
_inc_table.append( inct_starts[inct_cnt++], blk_labels[block_num].loc_pos() );
|
|
continue;
|
|
}
|
|
} // End of for all blocks fill in exception table entries
|
|
}
|
|
|
|
// Static Variables
|
|
#ifndef PRODUCT
|
|
uint Scheduling::_total_nop_size = 0;
|
|
uint Scheduling::_total_method_size = 0;
|
|
uint Scheduling::_total_branches = 0;
|
|
uint Scheduling::_total_unconditional_delays = 0;
|
|
uint Scheduling::_total_instructions_per_bundle[Pipeline::_max_instrs_per_cycle+1];
|
|
#endif
|
|
|
|
// Initializer for class Scheduling
|
|
|
|
Scheduling::Scheduling(Arena *arena, Compile &compile)
|
|
: _arena(arena),
|
|
_cfg(compile.cfg()),
|
|
_bbs(compile.cfg()->_bbs),
|
|
_regalloc(compile.regalloc()),
|
|
_reg_node(arena),
|
|
_bundle_instr_count(0),
|
|
_bundle_cycle_number(0),
|
|
_scheduled(arena),
|
|
_available(arena),
|
|
_next_node(NULL),
|
|
_bundle_use(0, 0, resource_count, &_bundle_use_elements[0]),
|
|
_pinch_free_list(arena)
|
|
#ifndef PRODUCT
|
|
, _branches(0)
|
|
, _unconditional_delays(0)
|
|
#endif
|
|
{
|
|
// Create a MachNopNode
|
|
_nop = new (&compile) MachNopNode();
|
|
|
|
// Now that the nops are in the array, save the count
|
|
// (but allow entries for the nops)
|
|
_node_bundling_limit = compile.unique();
|
|
uint node_max = _regalloc->node_regs_max_index();
|
|
|
|
compile.set_node_bundling_limit(_node_bundling_limit);
|
|
|
|
// This one is persistent within the Compile class
|
|
_node_bundling_base = NEW_ARENA_ARRAY(compile.comp_arena(), Bundle, node_max);
|
|
|
|
// Allocate space for fixed-size arrays
|
|
_node_latency = NEW_ARENA_ARRAY(arena, unsigned short, node_max);
|
|
_uses = NEW_ARENA_ARRAY(arena, short, node_max);
|
|
_current_latency = NEW_ARENA_ARRAY(arena, unsigned short, node_max);
|
|
|
|
// Clear the arrays
|
|
memset(_node_bundling_base, 0, node_max * sizeof(Bundle));
|
|
memset(_node_latency, 0, node_max * sizeof(unsigned short));
|
|
memset(_uses, 0, node_max * sizeof(short));
|
|
memset(_current_latency, 0, node_max * sizeof(unsigned short));
|
|
|
|
// Clear the bundling information
|
|
memcpy(_bundle_use_elements,
|
|
Pipeline_Use::elaborated_elements,
|
|
sizeof(Pipeline_Use::elaborated_elements));
|
|
|
|
// Get the last node
|
|
Block *bb = _cfg->_blocks[_cfg->_blocks.size()-1];
|
|
|
|
_next_node = bb->_nodes[bb->_nodes.size()-1];
|
|
}
|
|
|
|
#ifndef PRODUCT
|
|
// Scheduling destructor
|
|
Scheduling::~Scheduling() {
|
|
_total_branches += _branches;
|
|
_total_unconditional_delays += _unconditional_delays;
|
|
}
|
|
#endif
|
|
|
|
// Step ahead "i" cycles
|
|
void Scheduling::step(uint i) {
|
|
|
|
Bundle *bundle = node_bundling(_next_node);
|
|
bundle->set_starts_bundle();
|
|
|
|
// Update the bundle record, but leave the flags information alone
|
|
if (_bundle_instr_count > 0) {
|
|
bundle->set_instr_count(_bundle_instr_count);
|
|
bundle->set_resources_used(_bundle_use.resourcesUsed());
|
|
}
|
|
|
|
// Update the state information
|
|
_bundle_instr_count = 0;
|
|
_bundle_cycle_number += i;
|
|
_bundle_use.step(i);
|
|
}
|
|
|
|
void Scheduling::step_and_clear() {
|
|
Bundle *bundle = node_bundling(_next_node);
|
|
bundle->set_starts_bundle();
|
|
|
|
// Update the bundle record
|
|
if (_bundle_instr_count > 0) {
|
|
bundle->set_instr_count(_bundle_instr_count);
|
|
bundle->set_resources_used(_bundle_use.resourcesUsed());
|
|
|
|
_bundle_cycle_number += 1;
|
|
}
|
|
|
|
// Clear the bundling information
|
|
_bundle_instr_count = 0;
|
|
_bundle_use.reset();
|
|
|
|
memcpy(_bundle_use_elements,
|
|
Pipeline_Use::elaborated_elements,
|
|
sizeof(Pipeline_Use::elaborated_elements));
|
|
}
|
|
|
|
//------------------------------ScheduleAndBundle------------------------------
|
|
// Perform instruction scheduling and bundling over the sequence of
|
|
// instructions in backwards order.
|
|
void Compile::ScheduleAndBundle() {
|
|
|
|
// Don't optimize this if it isn't a method
|
|
if (!_method)
|
|
return;
|
|
|
|
// Don't optimize this if scheduling is disabled
|
|
if (!do_scheduling())
|
|
return;
|
|
|
|
// Scheduling code works only with pairs (8 bytes) maximum.
|
|
if (max_vector_size() > 8)
|
|
return;
|
|
|
|
NOT_PRODUCT( TracePhase t2("isched", &_t_instrSched, TimeCompiler); )
|
|
|
|
// Create a data structure for all the scheduling information
|
|
Scheduling scheduling(Thread::current()->resource_area(), *this);
|
|
|
|
// Walk backwards over each basic block, computing the needed alignment
|
|
// Walk over all the basic blocks
|
|
scheduling.DoScheduling();
|
|
}
|
|
|
|
//------------------------------ComputeLocalLatenciesForward-------------------
|
|
// Compute the latency of all the instructions. This is fairly simple,
|
|
// because we already have a legal ordering. Walk over the instructions
|
|
// from first to last, and compute the latency of the instruction based
|
|
// on the latency of the preceding instruction(s).
|
|
void Scheduling::ComputeLocalLatenciesForward(const Block *bb) {
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output())
|
|
tty->print("# -> ComputeLocalLatenciesForward\n");
|
|
#endif
|
|
|
|
// Walk over all the schedulable instructions
|
|
for( uint j=_bb_start; j < _bb_end; j++ ) {
|
|
|
|
// This is a kludge, forcing all latency calculations to start at 1.
|
|
// Used to allow latency 0 to force an instruction to the beginning
|
|
// of the bb
|
|
uint latency = 1;
|
|
Node *use = bb->_nodes[j];
|
|
uint nlen = use->len();
|
|
|
|
// Walk over all the inputs
|
|
for ( uint k=0; k < nlen; k++ ) {
|
|
Node *def = use->in(k);
|
|
if (!def)
|
|
continue;
|
|
|
|
uint l = _node_latency[def->_idx] + use->latency(k);
|
|
if (latency < l)
|
|
latency = l;
|
|
}
|
|
|
|
_node_latency[use->_idx] = latency;
|
|
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output()) {
|
|
tty->print("# latency %4d: ", latency);
|
|
use->dump();
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output())
|
|
tty->print("# <- ComputeLocalLatenciesForward\n");
|
|
#endif
|
|
|
|
} // end ComputeLocalLatenciesForward
|
|
|
|
// See if this node fits into the present instruction bundle
|
|
bool Scheduling::NodeFitsInBundle(Node *n) {
|
|
uint n_idx = n->_idx;
|
|
|
|
// If this is the unconditional delay instruction, then it fits
|
|
if (n == _unconditional_delay_slot) {
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output())
|
|
tty->print("# NodeFitsInBundle [%4d]: TRUE; is in unconditional delay slot\n", n->_idx);
|
|
#endif
|
|
return (true);
|
|
}
|
|
|
|
// If the node cannot be scheduled this cycle, skip it
|
|
if (_current_latency[n_idx] > _bundle_cycle_number) {
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output())
|
|
tty->print("# NodeFitsInBundle [%4d]: FALSE; latency %4d > %d\n",
|
|
n->_idx, _current_latency[n_idx], _bundle_cycle_number);
|
|
#endif
|
|
return (false);
|
|
}
|
|
|
|
const Pipeline *node_pipeline = n->pipeline();
|
|
|
|
uint instruction_count = node_pipeline->instructionCount();
|
|
if (node_pipeline->mayHaveNoCode() && n->size(_regalloc) == 0)
|
|
instruction_count = 0;
|
|
else if (node_pipeline->hasBranchDelay() && !_unconditional_delay_slot)
|
|
instruction_count++;
|
|
|
|
if (_bundle_instr_count + instruction_count > Pipeline::_max_instrs_per_cycle) {
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output())
|
|
tty->print("# NodeFitsInBundle [%4d]: FALSE; too many instructions: %d > %d\n",
|
|
n->_idx, _bundle_instr_count + instruction_count, Pipeline::_max_instrs_per_cycle);
|
|
#endif
|
|
return (false);
|
|
}
|
|
|
|
// Don't allow non-machine nodes to be handled this way
|
|
if (!n->is_Mach() && instruction_count == 0)
|
|
return (false);
|
|
|
|
// See if there is any overlap
|
|
uint delay = _bundle_use.full_latency(0, node_pipeline->resourceUse());
|
|
|
|
if (delay > 0) {
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output())
|
|
tty->print("# NodeFitsInBundle [%4d]: FALSE; functional units overlap\n", n_idx);
|
|
#endif
|
|
return false;
|
|
}
|
|
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output())
|
|
tty->print("# NodeFitsInBundle [%4d]: TRUE\n", n_idx);
|
|
#endif
|
|
|
|
return true;
|
|
}
|
|
|
|
Node * Scheduling::ChooseNodeToBundle() {
|
|
uint siz = _available.size();
|
|
|
|
if (siz == 0) {
|
|
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output())
|
|
tty->print("# ChooseNodeToBundle: NULL\n");
|
|
#endif
|
|
return (NULL);
|
|
}
|
|
|
|
// Fast path, if only 1 instruction in the bundle
|
|
if (siz == 1) {
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output()) {
|
|
tty->print("# ChooseNodeToBundle (only 1): ");
|
|
_available[0]->dump();
|
|
}
|
|
#endif
|
|
return (_available[0]);
|
|
}
|
|
|
|
// Don't bother, if the bundle is already full
|
|
if (_bundle_instr_count < Pipeline::_max_instrs_per_cycle) {
|
|
for ( uint i = 0; i < siz; i++ ) {
|
|
Node *n = _available[i];
|
|
|
|
// Skip projections, we'll handle them another way
|
|
if (n->is_Proj())
|
|
continue;
|
|
|
|
// This presupposed that instructions are inserted into the
|
|
// available list in a legality order; i.e. instructions that
|
|
// must be inserted first are at the head of the list
|
|
if (NodeFitsInBundle(n)) {
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output()) {
|
|
tty->print("# ChooseNodeToBundle: ");
|
|
n->dump();
|
|
}
|
|
#endif
|
|
return (n);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Nothing fits in this bundle, choose the highest priority
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output()) {
|
|
tty->print("# ChooseNodeToBundle: ");
|
|
_available[0]->dump();
|
|
}
|
|
#endif
|
|
|
|
return _available[0];
|
|
}
|
|
|
|
//------------------------------AddNodeToAvailableList-------------------------
|
|
void Scheduling::AddNodeToAvailableList(Node *n) {
|
|
assert( !n->is_Proj(), "projections never directly made available" );
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output()) {
|
|
tty->print("# AddNodeToAvailableList: ");
|
|
n->dump();
|
|
}
|
|
#endif
|
|
|
|
int latency = _current_latency[n->_idx];
|
|
|
|
// Insert in latency order (insertion sort)
|
|
uint i;
|
|
for ( i=0; i < _available.size(); i++ )
|
|
if (_current_latency[_available[i]->_idx] > latency)
|
|
break;
|
|
|
|
// Special Check for compares following branches
|
|
if( n->is_Mach() && _scheduled.size() > 0 ) {
|
|
int op = n->as_Mach()->ideal_Opcode();
|
|
Node *last = _scheduled[0];
|
|
if( last->is_MachIf() && last->in(1) == n &&
|
|
( op == Op_CmpI ||
|
|
op == Op_CmpU ||
|
|
op == Op_CmpP ||
|
|
op == Op_CmpF ||
|
|
op == Op_CmpD ||
|
|
op == Op_CmpL ) ) {
|
|
|
|
// Recalculate position, moving to front of same latency
|
|
for ( i=0 ; i < _available.size(); i++ )
|
|
if (_current_latency[_available[i]->_idx] >= latency)
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Insert the node in the available list
|
|
_available.insert(i, n);
|
|
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output())
|
|
dump_available();
|
|
#endif
|
|
}
|
|
|
|
//------------------------------DecrementUseCounts-----------------------------
|
|
void Scheduling::DecrementUseCounts(Node *n, const Block *bb) {
|
|
for ( uint i=0; i < n->len(); i++ ) {
|
|
Node *def = n->in(i);
|
|
if (!def) continue;
|
|
if( def->is_Proj() ) // If this is a machine projection, then
|
|
def = def->in(0); // propagate usage thru to the base instruction
|
|
|
|
if( _bbs[def->_idx] != bb ) // Ignore if not block-local
|
|
continue;
|
|
|
|
// Compute the latency
|
|
uint l = _bundle_cycle_number + n->latency(i);
|
|
if (_current_latency[def->_idx] < l)
|
|
_current_latency[def->_idx] = l;
|
|
|
|
// If this does not have uses then schedule it
|
|
if ((--_uses[def->_idx]) == 0)
|
|
AddNodeToAvailableList(def);
|
|
}
|
|
}
|
|
|
|
//------------------------------AddNodeToBundle--------------------------------
|
|
void Scheduling::AddNodeToBundle(Node *n, const Block *bb) {
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output()) {
|
|
tty->print("# AddNodeToBundle: ");
|
|
n->dump();
|
|
}
|
|
#endif
|
|
|
|
// Remove this from the available list
|
|
uint i;
|
|
for (i = 0; i < _available.size(); i++)
|
|
if (_available[i] == n)
|
|
break;
|
|
assert(i < _available.size(), "entry in _available list not found");
|
|
_available.remove(i);
|
|
|
|
// See if this fits in the current bundle
|
|
const Pipeline *node_pipeline = n->pipeline();
|
|
const Pipeline_Use& node_usage = node_pipeline->resourceUse();
|
|
|
|
// Check for instructions to be placed in the delay slot. We
|
|
// do this before we actually schedule the current instruction,
|
|
// because the delay slot follows the current instruction.
|
|
if (Pipeline::_branch_has_delay_slot &&
|
|
node_pipeline->hasBranchDelay() &&
|
|
!_unconditional_delay_slot) {
|
|
|
|
uint siz = _available.size();
|
|
|
|
// Conditional branches can support an instruction that
|
|
// is unconditionally executed and not dependent by the
|
|
// branch, OR a conditionally executed instruction if
|
|
// the branch is taken. In practice, this means that
|
|
// the first instruction at the branch target is
|
|
// copied to the delay slot, and the branch goes to
|
|
// the instruction after that at the branch target
|
|
if ( n->is_MachBranch() ) {
|
|
|
|
assert( !n->is_MachNullCheck(), "should not look for delay slot for Null Check" );
|
|
assert( !n->is_Catch(), "should not look for delay slot for Catch" );
|
|
|
|
#ifndef PRODUCT
|
|
_branches++;
|
|
#endif
|
|
|
|
// At least 1 instruction is on the available list
|
|
// that is not dependent on the branch
|
|
for (uint i = 0; i < siz; i++) {
|
|
Node *d = _available[i];
|
|
const Pipeline *avail_pipeline = d->pipeline();
|
|
|
|
// Don't allow safepoints in the branch shadow, that will
|
|
// cause a number of difficulties
|
|
if ( avail_pipeline->instructionCount() == 1 &&
|
|
!avail_pipeline->hasMultipleBundles() &&
|
|
!avail_pipeline->hasBranchDelay() &&
|
|
Pipeline::instr_has_unit_size() &&
|
|
d->size(_regalloc) == Pipeline::instr_unit_size() &&
|
|
NodeFitsInBundle(d) &&
|
|
!node_bundling(d)->used_in_delay()) {
|
|
|
|
if (d->is_Mach() && !d->is_MachSafePoint()) {
|
|
// A node that fits in the delay slot was found, so we need to
|
|
// set the appropriate bits in the bundle pipeline information so
|
|
// that it correctly indicates resource usage. Later, when we
|
|
// attempt to add this instruction to the bundle, we will skip
|
|
// setting the resource usage.
|
|
_unconditional_delay_slot = d;
|
|
node_bundling(n)->set_use_unconditional_delay();
|
|
node_bundling(d)->set_used_in_unconditional_delay();
|
|
_bundle_use.add_usage(avail_pipeline->resourceUse());
|
|
_current_latency[d->_idx] = _bundle_cycle_number;
|
|
_next_node = d;
|
|
++_bundle_instr_count;
|
|
#ifndef PRODUCT
|
|
_unconditional_delays++;
|
|
#endif
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// No delay slot, add a nop to the usage
|
|
if (!_unconditional_delay_slot) {
|
|
// See if adding an instruction in the delay slot will overflow
|
|
// the bundle.
|
|
if (!NodeFitsInBundle(_nop)) {
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output())
|
|
tty->print("# *** STEP(1 instruction for delay slot) ***\n");
|
|
#endif
|
|
step(1);
|
|
}
|
|
|
|
_bundle_use.add_usage(_nop->pipeline()->resourceUse());
|
|
_next_node = _nop;
|
|
++_bundle_instr_count;
|
|
}
|
|
|
|
// See if the instruction in the delay slot requires a
|
|
// step of the bundles
|
|
if (!NodeFitsInBundle(n)) {
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output())
|
|
tty->print("# *** STEP(branch won't fit) ***\n");
|
|
#endif
|
|
// Update the state information
|
|
_bundle_instr_count = 0;
|
|
_bundle_cycle_number += 1;
|
|
_bundle_use.step(1);
|
|
}
|
|
}
|
|
|
|
// Get the number of instructions
|
|
uint instruction_count = node_pipeline->instructionCount();
|
|
if (node_pipeline->mayHaveNoCode() && n->size(_regalloc) == 0)
|
|
instruction_count = 0;
|
|
|
|
// Compute the latency information
|
|
uint delay = 0;
|
|
|
|
if (instruction_count > 0 || !node_pipeline->mayHaveNoCode()) {
|
|
int relative_latency = _current_latency[n->_idx] - _bundle_cycle_number;
|
|
if (relative_latency < 0)
|
|
relative_latency = 0;
|
|
|
|
delay = _bundle_use.full_latency(relative_latency, node_usage);
|
|
|
|
// Does not fit in this bundle, start a new one
|
|
if (delay > 0) {
|
|
step(delay);
|
|
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output())
|
|
tty->print("# *** STEP(%d) ***\n", delay);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
// If this was placed in the delay slot, ignore it
|
|
if (n != _unconditional_delay_slot) {
|
|
|
|
if (delay == 0) {
|
|
if (node_pipeline->hasMultipleBundles()) {
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output())
|
|
tty->print("# *** STEP(multiple instructions) ***\n");
|
|
#endif
|
|
step(1);
|
|
}
|
|
|
|
else if (instruction_count + _bundle_instr_count > Pipeline::_max_instrs_per_cycle) {
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output())
|
|
tty->print("# *** STEP(%d >= %d instructions) ***\n",
|
|
instruction_count + _bundle_instr_count,
|
|
Pipeline::_max_instrs_per_cycle);
|
|
#endif
|
|
step(1);
|
|
}
|
|
}
|
|
|
|
if (node_pipeline->hasBranchDelay() && !_unconditional_delay_slot)
|
|
_bundle_instr_count++;
|
|
|
|
// Set the node's latency
|
|
_current_latency[n->_idx] = _bundle_cycle_number;
|
|
|
|
// Now merge the functional unit information
|
|
if (instruction_count > 0 || !node_pipeline->mayHaveNoCode())
|
|
_bundle_use.add_usage(node_usage);
|
|
|
|
// Increment the number of instructions in this bundle
|
|
_bundle_instr_count += instruction_count;
|
|
|
|
// Remember this node for later
|
|
if (n->is_Mach())
|
|
_next_node = n;
|
|
}
|
|
|
|
// It's possible to have a BoxLock in the graph and in the _bbs mapping but
|
|
// not in the bb->_nodes array. This happens for debug-info-only BoxLocks.
|
|
// 'Schedule' them (basically ignore in the schedule) but do not insert them
|
|
// into the block. All other scheduled nodes get put in the schedule here.
|
|
int op = n->Opcode();
|
|
if( (op == Op_Node && n->req() == 0) || // anti-dependence node OR
|
|
(op != Op_Node && // Not an unused antidepedence node and
|
|
// not an unallocated boxlock
|
|
(OptoReg::is_valid(_regalloc->get_reg_first(n)) || op != Op_BoxLock)) ) {
|
|
|
|
// Push any trailing projections
|
|
if( bb->_nodes[bb->_nodes.size()-1] != n ) {
|
|
for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
|
|
Node *foi = n->fast_out(i);
|
|
if( foi->is_Proj() )
|
|
_scheduled.push(foi);
|
|
}
|
|
}
|
|
|
|
// Put the instruction in the schedule list
|
|
_scheduled.push(n);
|
|
}
|
|
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output())
|
|
dump_available();
|
|
#endif
|
|
|
|
// Walk all the definitions, decrementing use counts, and
|
|
// if a definition has a 0 use count, place it in the available list.
|
|
DecrementUseCounts(n,bb);
|
|
}
|
|
|
|
//------------------------------ComputeUseCount--------------------------------
|
|
// This method sets the use count within a basic block. We will ignore all
|
|
// uses outside the current basic block. As we are doing a backwards walk,
|
|
// any node we reach that has a use count of 0 may be scheduled. This also
|
|
// avoids the problem of cyclic references from phi nodes, as long as phi
|
|
// nodes are at the front of the basic block. This method also initializes
|
|
// the available list to the set of instructions that have no uses within this
|
|
// basic block.
|
|
void Scheduling::ComputeUseCount(const Block *bb) {
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output())
|
|
tty->print("# -> ComputeUseCount\n");
|
|
#endif
|
|
|
|
// Clear the list of available and scheduled instructions, just in case
|
|
_available.clear();
|
|
_scheduled.clear();
|
|
|
|
// No delay slot specified
|
|
_unconditional_delay_slot = NULL;
|
|
|
|
#ifdef ASSERT
|
|
for( uint i=0; i < bb->_nodes.size(); i++ )
|
|
assert( _uses[bb->_nodes[i]->_idx] == 0, "_use array not clean" );
|
|
#endif
|
|
|
|
// Force the _uses count to never go to zero for unscheduable pieces
|
|
// of the block
|
|
for( uint k = 0; k < _bb_start; k++ )
|
|
_uses[bb->_nodes[k]->_idx] = 1;
|
|
for( uint l = _bb_end; l < bb->_nodes.size(); l++ )
|
|
_uses[bb->_nodes[l]->_idx] = 1;
|
|
|
|
// Iterate backwards over the instructions in the block. Don't count the
|
|
// branch projections at end or the block header instructions.
|
|
for( uint j = _bb_end-1; j >= _bb_start; j-- ) {
|
|
Node *n = bb->_nodes[j];
|
|
if( n->is_Proj() ) continue; // Projections handled another way
|
|
|
|
// Account for all uses
|
|
for ( uint k = 0; k < n->len(); k++ ) {
|
|
Node *inp = n->in(k);
|
|
if (!inp) continue;
|
|
assert(inp != n, "no cycles allowed" );
|
|
if( _bbs[inp->_idx] == bb ) { // Block-local use?
|
|
if( inp->is_Proj() ) // Skip through Proj's
|
|
inp = inp->in(0);
|
|
++_uses[inp->_idx]; // Count 1 block-local use
|
|
}
|
|
}
|
|
|
|
// If this instruction has a 0 use count, then it is available
|
|
if (!_uses[n->_idx]) {
|
|
_current_latency[n->_idx] = _bundle_cycle_number;
|
|
AddNodeToAvailableList(n);
|
|
}
|
|
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output()) {
|
|
tty->print("# uses: %3d: ", _uses[n->_idx]);
|
|
n->dump();
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output())
|
|
tty->print("# <- ComputeUseCount\n");
|
|
#endif
|
|
}
|
|
|
|
// This routine performs scheduling on each basic block in reverse order,
|
|
// using instruction latencies and taking into account function unit
|
|
// availability.
|
|
void Scheduling::DoScheduling() {
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output())
|
|
tty->print("# -> DoScheduling\n");
|
|
#endif
|
|
|
|
Block *succ_bb = NULL;
|
|
Block *bb;
|
|
|
|
// Walk over all the basic blocks in reverse order
|
|
for( int i=_cfg->_num_blocks-1; i >= 0; succ_bb = bb, i-- ) {
|
|
bb = _cfg->_blocks[i];
|
|
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output()) {
|
|
tty->print("# Schedule BB#%03d (initial)\n", i);
|
|
for (uint j = 0; j < bb->_nodes.size(); j++)
|
|
bb->_nodes[j]->dump();
|
|
}
|
|
#endif
|
|
|
|
// On the head node, skip processing
|
|
if( bb == _cfg->_broot )
|
|
continue;
|
|
|
|
// Skip empty, connector blocks
|
|
if (bb->is_connector())
|
|
continue;
|
|
|
|
// If the following block is not the sole successor of
|
|
// this one, then reset the pipeline information
|
|
if (bb->_num_succs != 1 || bb->non_connector_successor(0) != succ_bb) {
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output()) {
|
|
tty->print("*** bundle start of next BB, node %d, for %d instructions\n",
|
|
_next_node->_idx, _bundle_instr_count);
|
|
}
|
|
#endif
|
|
step_and_clear();
|
|
}
|
|
|
|
// Leave untouched the starting instruction, any Phis, a CreateEx node
|
|
// or Top. bb->_nodes[_bb_start] is the first schedulable instruction.
|
|
_bb_end = bb->_nodes.size()-1;
|
|
for( _bb_start=1; _bb_start <= _bb_end; _bb_start++ ) {
|
|
Node *n = bb->_nodes[_bb_start];
|
|
// Things not matched, like Phinodes and ProjNodes don't get scheduled.
|
|
// Also, MachIdealNodes do not get scheduled
|
|
if( !n->is_Mach() ) continue; // Skip non-machine nodes
|
|
MachNode *mach = n->as_Mach();
|
|
int iop = mach->ideal_Opcode();
|
|
if( iop == Op_CreateEx ) continue; // CreateEx is pinned
|
|
if( iop == Op_Con ) continue; // Do not schedule Top
|
|
if( iop == Op_Node && // Do not schedule PhiNodes, ProjNodes
|
|
mach->pipeline() == MachNode::pipeline_class() &&
|
|
!n->is_SpillCopy() ) // Breakpoints, Prolog, etc
|
|
continue;
|
|
break; // Funny loop structure to be sure...
|
|
}
|
|
// Compute last "interesting" instruction in block - last instruction we
|
|
// might schedule. _bb_end points just after last schedulable inst. We
|
|
// normally schedule conditional branches (despite them being forced last
|
|
// in the block), because they have delay slots we can fill. Calls all
|
|
// have their delay slots filled in the template expansions, so we don't
|
|
// bother scheduling them.
|
|
Node *last = bb->_nodes[_bb_end];
|
|
// Ignore trailing NOPs.
|
|
while (_bb_end > 0 && last->is_Mach() &&
|
|
last->as_Mach()->ideal_Opcode() == Op_Con) {
|
|
last = bb->_nodes[--_bb_end];
|
|
}
|
|
assert(!last->is_Mach() || last->as_Mach()->ideal_Opcode() != Op_Con, "");
|
|
if( last->is_Catch() ||
|
|
// Exclude unreachable path case when Halt node is in a separate block.
|
|
(_bb_end > 1 && last->is_Mach() && last->as_Mach()->ideal_Opcode() == Op_Halt) ) {
|
|
// There must be a prior call. Skip it.
|
|
while( !bb->_nodes[--_bb_end]->is_MachCall() ) {
|
|
assert( bb->_nodes[_bb_end]->is_MachProj(), "skipping projections after expected call" );
|
|
}
|
|
} else if( last->is_MachNullCheck() ) {
|
|
// Backup so the last null-checked memory instruction is
|
|
// outside the schedulable range. Skip over the nullcheck,
|
|
// projection, and the memory nodes.
|
|
Node *mem = last->in(1);
|
|
do {
|
|
_bb_end--;
|
|
} while (mem != bb->_nodes[_bb_end]);
|
|
} else {
|
|
// Set _bb_end to point after last schedulable inst.
|
|
_bb_end++;
|
|
}
|
|
|
|
assert( _bb_start <= _bb_end, "inverted block ends" );
|
|
|
|
// Compute the register antidependencies for the basic block
|
|
ComputeRegisterAntidependencies(bb);
|
|
if (_cfg->C->failing()) return; // too many D-U pinch points
|
|
|
|
// Compute intra-bb latencies for the nodes
|
|
ComputeLocalLatenciesForward(bb);
|
|
|
|
// Compute the usage within the block, and set the list of all nodes
|
|
// in the block that have no uses within the block.
|
|
ComputeUseCount(bb);
|
|
|
|
// Schedule the remaining instructions in the block
|
|
while ( _available.size() > 0 ) {
|
|
Node *n = ChooseNodeToBundle();
|
|
AddNodeToBundle(n,bb);
|
|
}
|
|
|
|
assert( _scheduled.size() == _bb_end - _bb_start, "wrong number of instructions" );
|
|
#ifdef ASSERT
|
|
for( uint l = _bb_start; l < _bb_end; l++ ) {
|
|
Node *n = bb->_nodes[l];
|
|
uint m;
|
|
for( m = 0; m < _bb_end-_bb_start; m++ )
|
|
if( _scheduled[m] == n )
|
|
break;
|
|
assert( m < _bb_end-_bb_start, "instruction missing in schedule" );
|
|
}
|
|
#endif
|
|
|
|
// Now copy the instructions (in reverse order) back to the block
|
|
for ( uint k = _bb_start; k < _bb_end; k++ )
|
|
bb->_nodes.map(k, _scheduled[_bb_end-k-1]);
|
|
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output()) {
|
|
tty->print("# Schedule BB#%03d (final)\n", i);
|
|
uint current = 0;
|
|
for (uint j = 0; j < bb->_nodes.size(); j++) {
|
|
Node *n = bb->_nodes[j];
|
|
if( valid_bundle_info(n) ) {
|
|
Bundle *bundle = node_bundling(n);
|
|
if (bundle->instr_count() > 0 || bundle->flags() > 0) {
|
|
tty->print("*** Bundle: ");
|
|
bundle->dump();
|
|
}
|
|
n->dump();
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
#ifdef ASSERT
|
|
verify_good_schedule(bb,"after block local scheduling");
|
|
#endif
|
|
}
|
|
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output())
|
|
tty->print("# <- DoScheduling\n");
|
|
#endif
|
|
|
|
// Record final node-bundling array location
|
|
_regalloc->C->set_node_bundling_base(_node_bundling_base);
|
|
|
|
} // end DoScheduling
|
|
|
|
//------------------------------verify_good_schedule---------------------------
|
|
// Verify that no live-range used in the block is killed in the block by a
|
|
// wrong DEF. This doesn't verify live-ranges that span blocks.
|
|
|
|
// Check for edge existence. Used to avoid adding redundant precedence edges.
|
|
static bool edge_from_to( Node *from, Node *to ) {
|
|
for( uint i=0; i<from->len(); i++ )
|
|
if( from->in(i) == to )
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
#ifdef ASSERT
|
|
//------------------------------verify_do_def----------------------------------
|
|
void Scheduling::verify_do_def( Node *n, OptoReg::Name def, const char *msg ) {
|
|
// Check for bad kills
|
|
if( OptoReg::is_valid(def) ) { // Ignore stores & control flow
|
|
Node *prior_use = _reg_node[def];
|
|
if( prior_use && !edge_from_to(prior_use,n) ) {
|
|
tty->print("%s = ",OptoReg::as_VMReg(def)->name());
|
|
n->dump();
|
|
tty->print_cr("...");
|
|
prior_use->dump();
|
|
assert(edge_from_to(prior_use,n),msg);
|
|
}
|
|
_reg_node.map(def,NULL); // Kill live USEs
|
|
}
|
|
}
|
|
|
|
//------------------------------verify_good_schedule---------------------------
|
|
void Scheduling::verify_good_schedule( Block *b, const char *msg ) {
|
|
|
|
// Zap to something reasonable for the verify code
|
|
_reg_node.clear();
|
|
|
|
// Walk over the block backwards. Check to make sure each DEF doesn't
|
|
// kill a live value (other than the one it's supposed to). Add each
|
|
// USE to the live set.
|
|
for( uint i = b->_nodes.size()-1; i >= _bb_start; i-- ) {
|
|
Node *n = b->_nodes[i];
|
|
int n_op = n->Opcode();
|
|
if( n_op == Op_MachProj && n->ideal_reg() == MachProjNode::fat_proj ) {
|
|
// Fat-proj kills a slew of registers
|
|
RegMask rm = n->out_RegMask();// Make local copy
|
|
while( rm.is_NotEmpty() ) {
|
|
OptoReg::Name kill = rm.find_first_elem();
|
|
rm.Remove(kill);
|
|
verify_do_def( n, kill, msg );
|
|
}
|
|
} else if( n_op != Op_Node ) { // Avoid brand new antidependence nodes
|
|
// Get DEF'd registers the normal way
|
|
verify_do_def( n, _regalloc->get_reg_first(n), msg );
|
|
verify_do_def( n, _regalloc->get_reg_second(n), msg );
|
|
}
|
|
|
|
// Now make all USEs live
|
|
for( uint i=1; i<n->req(); i++ ) {
|
|
Node *def = n->in(i);
|
|
assert(def != 0, "input edge required");
|
|
OptoReg::Name reg_lo = _regalloc->get_reg_first(def);
|
|
OptoReg::Name reg_hi = _regalloc->get_reg_second(def);
|
|
if( OptoReg::is_valid(reg_lo) ) {
|
|
assert(!_reg_node[reg_lo] || edge_from_to(_reg_node[reg_lo],def), msg);
|
|
_reg_node.map(reg_lo,n);
|
|
}
|
|
if( OptoReg::is_valid(reg_hi) ) {
|
|
assert(!_reg_node[reg_hi] || edge_from_to(_reg_node[reg_hi],def), msg);
|
|
_reg_node.map(reg_hi,n);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
// Zap to something reasonable for the Antidependence code
|
|
_reg_node.clear();
|
|
}
|
|
#endif
|
|
|
|
// Conditionally add precedence edges. Avoid putting edges on Projs.
|
|
static void add_prec_edge_from_to( Node *from, Node *to ) {
|
|
if( from->is_Proj() ) { // Put precedence edge on Proj's input
|
|
assert( from->req() == 1 && (from->len() == 1 || from->in(1)==0), "no precedence edges on projections" );
|
|
from = from->in(0);
|
|
}
|
|
if( from != to && // No cycles (for things like LD L0,[L0+4] )
|
|
!edge_from_to( from, to ) ) // Avoid duplicate edge
|
|
from->add_prec(to);
|
|
}
|
|
|
|
//------------------------------anti_do_def------------------------------------
|
|
void Scheduling::anti_do_def( Block *b, Node *def, OptoReg::Name def_reg, int is_def ) {
|
|
if( !OptoReg::is_valid(def_reg) ) // Ignore stores & control flow
|
|
return;
|
|
|
|
Node *pinch = _reg_node[def_reg]; // Get pinch point
|
|
if( !pinch || _bbs[pinch->_idx] != b || // No pinch-point yet?
|
|
is_def ) { // Check for a true def (not a kill)
|
|
_reg_node.map(def_reg,def); // Record def/kill as the optimistic pinch-point
|
|
return;
|
|
}
|
|
|
|
Node *kill = def; // Rename 'def' to more descriptive 'kill'
|
|
debug_only( def = (Node*)0xdeadbeef; )
|
|
|
|
// After some number of kills there _may_ be a later def
|
|
Node *later_def = NULL;
|
|
|
|
// Finding a kill requires a real pinch-point.
|
|
// Check for not already having a pinch-point.
|
|
// Pinch points are Op_Node's.
|
|
if( pinch->Opcode() != Op_Node ) { // Or later-def/kill as pinch-point?
|
|
later_def = pinch; // Must be def/kill as optimistic pinch-point
|
|
if ( _pinch_free_list.size() > 0) {
|
|
pinch = _pinch_free_list.pop();
|
|
} else {
|
|
pinch = new (_cfg->C) Node(1); // Pinch point to-be
|
|
}
|
|
if (pinch->_idx >= _regalloc->node_regs_max_index()) {
|
|
_cfg->C->record_method_not_compilable("too many D-U pinch points");
|
|
return;
|
|
}
|
|
_bbs.map(pinch->_idx,b); // Pretend it's valid in this block (lazy init)
|
|
_reg_node.map(def_reg,pinch); // Record pinch-point
|
|
//_regalloc->set_bad(pinch->_idx); // Already initialized this way.
|
|
if( later_def->outcnt() == 0 || later_def->ideal_reg() == MachProjNode::fat_proj ) { // Distinguish def from kill
|
|
pinch->init_req(0, _cfg->C->top()); // set not NULL for the next call
|
|
add_prec_edge_from_to(later_def,pinch); // Add edge from kill to pinch
|
|
later_def = NULL; // and no later def
|
|
}
|
|
pinch->set_req(0,later_def); // Hook later def so we can find it
|
|
} else { // Else have valid pinch point
|
|
if( pinch->in(0) ) // If there is a later-def
|
|
later_def = pinch->in(0); // Get it
|
|
}
|
|
|
|
// Add output-dependence edge from later def to kill
|
|
if( later_def ) // If there is some original def
|
|
add_prec_edge_from_to(later_def,kill); // Add edge from def to kill
|
|
|
|
// See if current kill is also a use, and so is forced to be the pinch-point.
|
|
if( pinch->Opcode() == Op_Node ) {
|
|
Node *uses = kill->is_Proj() ? kill->in(0) : kill;
|
|
for( uint i=1; i<uses->req(); i++ ) {
|
|
if( _regalloc->get_reg_first(uses->in(i)) == def_reg ||
|
|
_regalloc->get_reg_second(uses->in(i)) == def_reg ) {
|
|
// Yes, found a use/kill pinch-point
|
|
pinch->set_req(0,NULL); //
|
|
pinch->replace_by(kill); // Move anti-dep edges up
|
|
pinch = kill;
|
|
_reg_node.map(def_reg,pinch);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Add edge from kill to pinch-point
|
|
add_prec_edge_from_to(kill,pinch);
|
|
}
|
|
|
|
//------------------------------anti_do_use------------------------------------
|
|
void Scheduling::anti_do_use( Block *b, Node *use, OptoReg::Name use_reg ) {
|
|
if( !OptoReg::is_valid(use_reg) ) // Ignore stores & control flow
|
|
return;
|
|
Node *pinch = _reg_node[use_reg]; // Get pinch point
|
|
// Check for no later def_reg/kill in block
|
|
if( pinch && _bbs[pinch->_idx] == b &&
|
|
// Use has to be block-local as well
|
|
_bbs[use->_idx] == b ) {
|
|
if( pinch->Opcode() == Op_Node && // Real pinch-point (not optimistic?)
|
|
pinch->req() == 1 ) { // pinch not yet in block?
|
|
pinch->del_req(0); // yank pointer to later-def, also set flag
|
|
// Insert the pinch-point in the block just after the last use
|
|
b->_nodes.insert(b->find_node(use)+1,pinch);
|
|
_bb_end++; // Increase size scheduled region in block
|
|
}
|
|
|
|
add_prec_edge_from_to(pinch,use);
|
|
}
|
|
}
|
|
|
|
//------------------------------ComputeRegisterAntidependences-----------------
|
|
// We insert antidependences between the reads and following write of
|
|
// allocated registers to prevent illegal code motion. Hopefully, the
|
|
// number of added references should be fairly small, especially as we
|
|
// are only adding references within the current basic block.
|
|
void Scheduling::ComputeRegisterAntidependencies(Block *b) {
|
|
|
|
#ifdef ASSERT
|
|
verify_good_schedule(b,"before block local scheduling");
|
|
#endif
|
|
|
|
// A valid schedule, for each register independently, is an endless cycle
|
|
// of: a def, then some uses (connected to the def by true dependencies),
|
|
// then some kills (defs with no uses), finally the cycle repeats with a new
|
|
// def. The uses are allowed to float relative to each other, as are the
|
|
// kills. No use is allowed to slide past a kill (or def). This requires
|
|
// antidependencies between all uses of a single def and all kills that
|
|
// follow, up to the next def. More edges are redundant, because later defs
|
|
// & kills are already serialized with true or antidependencies. To keep
|
|
// the edge count down, we add a 'pinch point' node if there's more than
|
|
// one use or more than one kill/def.
|
|
|
|
// We add dependencies in one bottom-up pass.
|
|
|
|
// For each instruction we handle it's DEFs/KILLs, then it's USEs.
|
|
|
|
// For each DEF/KILL, we check to see if there's a prior DEF/KILL for this
|
|
// register. If not, we record the DEF/KILL in _reg_node, the
|
|
// register-to-def mapping. If there is a prior DEF/KILL, we insert a
|
|
// "pinch point", a new Node that's in the graph but not in the block.
|
|
// We put edges from the prior and current DEF/KILLs to the pinch point.
|
|
// We put the pinch point in _reg_node. If there's already a pinch point
|
|
// we merely add an edge from the current DEF/KILL to the pinch point.
|
|
|
|
// After doing the DEF/KILLs, we handle USEs. For each used register, we
|
|
// put an edge from the pinch point to the USE.
|
|
|
|
// To be expedient, the _reg_node array is pre-allocated for the whole
|
|
// compilation. _reg_node is lazily initialized; it either contains a NULL,
|
|
// or a valid def/kill/pinch-point, or a leftover node from some prior
|
|
// block. Leftover node from some prior block is treated like a NULL (no
|
|
// prior def, so no anti-dependence needed). Valid def is distinguished by
|
|
// it being in the current block.
|
|
bool fat_proj_seen = false;
|
|
uint last_safept = _bb_end-1;
|
|
Node* end_node = (_bb_end-1 >= _bb_start) ? b->_nodes[last_safept] : NULL;
|
|
Node* last_safept_node = end_node;
|
|
for( uint i = _bb_end-1; i >= _bb_start; i-- ) {
|
|
Node *n = b->_nodes[i];
|
|
int is_def = n->outcnt(); // def if some uses prior to adding precedence edges
|
|
if( n->is_MachProj() && n->ideal_reg() == MachProjNode::fat_proj ) {
|
|
// Fat-proj kills a slew of registers
|
|
// This can add edges to 'n' and obscure whether or not it was a def,
|
|
// hence the is_def flag.
|
|
fat_proj_seen = true;
|
|
RegMask rm = n->out_RegMask();// Make local copy
|
|
while( rm.is_NotEmpty() ) {
|
|
OptoReg::Name kill = rm.find_first_elem();
|
|
rm.Remove(kill);
|
|
anti_do_def( b, n, kill, is_def );
|
|
}
|
|
} else {
|
|
// Get DEF'd registers the normal way
|
|
anti_do_def( b, n, _regalloc->get_reg_first(n), is_def );
|
|
anti_do_def( b, n, _regalloc->get_reg_second(n), is_def );
|
|
}
|
|
|
|
// Kill projections on a branch should appear to occur on the
|
|
// branch, not afterwards, so grab the masks from the projections
|
|
// and process them.
|
|
if (n->is_MachBranch() || n->is_Mach() && n->as_Mach()->ideal_Opcode() == Op_Jump) {
|
|
for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
|
|
Node* use = n->fast_out(i);
|
|
if (use->is_Proj()) {
|
|
RegMask rm = use->out_RegMask();// Make local copy
|
|
while( rm.is_NotEmpty() ) {
|
|
OptoReg::Name kill = rm.find_first_elem();
|
|
rm.Remove(kill);
|
|
anti_do_def( b, n, kill, false );
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Check each register used by this instruction for a following DEF/KILL
|
|
// that must occur afterward and requires an anti-dependence edge.
|
|
for( uint j=0; j<n->req(); j++ ) {
|
|
Node *def = n->in(j);
|
|
if( def ) {
|
|
assert( !def->is_MachProj() || def->ideal_reg() != MachProjNode::fat_proj, "" );
|
|
anti_do_use( b, n, _regalloc->get_reg_first(def) );
|
|
anti_do_use( b, n, _regalloc->get_reg_second(def) );
|
|
}
|
|
}
|
|
// Do not allow defs of new derived values to float above GC
|
|
// points unless the base is definitely available at the GC point.
|
|
|
|
Node *m = b->_nodes[i];
|
|
|
|
// Add precedence edge from following safepoint to use of derived pointer
|
|
if( last_safept_node != end_node &&
|
|
m != last_safept_node) {
|
|
for (uint k = 1; k < m->req(); k++) {
|
|
const Type *t = m->in(k)->bottom_type();
|
|
if( t->isa_oop_ptr() &&
|
|
t->is_ptr()->offset() != 0 ) {
|
|
last_safept_node->add_prec( m );
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if( n->jvms() ) { // Precedence edge from derived to safept
|
|
// Check if last_safept_node was moved by pinch-point insertion in anti_do_use()
|
|
if( b->_nodes[last_safept] != last_safept_node ) {
|
|
last_safept = b->find_node(last_safept_node);
|
|
}
|
|
for( uint j=last_safept; j > i; j-- ) {
|
|
Node *mach = b->_nodes[j];
|
|
if( mach->is_Mach() && mach->as_Mach()->ideal_Opcode() == Op_AddP )
|
|
mach->add_prec( n );
|
|
}
|
|
last_safept = i;
|
|
last_safept_node = m;
|
|
}
|
|
}
|
|
|
|
if (fat_proj_seen) {
|
|
// Garbage collect pinch nodes that were not consumed.
|
|
// They are usually created by a fat kill MachProj for a call.
|
|
garbage_collect_pinch_nodes();
|
|
}
|
|
}
|
|
|
|
//------------------------------garbage_collect_pinch_nodes-------------------------------
|
|
|
|
// Garbage collect pinch nodes for reuse by other blocks.
|
|
//
|
|
// The block scheduler's insertion of anti-dependence
|
|
// edges creates many pinch nodes when the block contains
|
|
// 2 or more Calls. A pinch node is used to prevent a
|
|
// combinatorial explosion of edges. If a set of kills for a
|
|
// register is anti-dependent on a set of uses (or defs), rather
|
|
// than adding an edge in the graph between each pair of kill
|
|
// and use (or def), a pinch is inserted between them:
|
|
//
|
|
// use1 use2 use3
|
|
// \ | /
|
|
// \ | /
|
|
// pinch
|
|
// / | \
|
|
// / | \
|
|
// kill1 kill2 kill3
|
|
//
|
|
// One pinch node is created per register killed when
|
|
// the second call is encountered during a backwards pass
|
|
// over the block. Most of these pinch nodes are never
|
|
// wired into the graph because the register is never
|
|
// used or def'ed in the block.
|
|
//
|
|
void Scheduling::garbage_collect_pinch_nodes() {
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output()) tty->print("Reclaimed pinch nodes:");
|
|
#endif
|
|
int trace_cnt = 0;
|
|
for (uint k = 0; k < _reg_node.Size(); k++) {
|
|
Node* pinch = _reg_node[k];
|
|
if (pinch != NULL && pinch->Opcode() == Op_Node &&
|
|
// no predecence input edges
|
|
(pinch->req() == pinch->len() || pinch->in(pinch->req()) == NULL) ) {
|
|
cleanup_pinch(pinch);
|
|
_pinch_free_list.push(pinch);
|
|
_reg_node.map(k, NULL);
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output()) {
|
|
trace_cnt++;
|
|
if (trace_cnt > 40) {
|
|
tty->print("\n");
|
|
trace_cnt = 0;
|
|
}
|
|
tty->print(" %d", pinch->_idx);
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
#ifndef PRODUCT
|
|
if (_cfg->C->trace_opto_output()) tty->print("\n");
|
|
#endif
|
|
}
|
|
|
|
// Clean up a pinch node for reuse.
|
|
void Scheduling::cleanup_pinch( Node *pinch ) {
|
|
assert (pinch && pinch->Opcode() == Op_Node && pinch->req() == 1, "just checking");
|
|
|
|
for (DUIterator_Last imin, i = pinch->last_outs(imin); i >= imin; ) {
|
|
Node* use = pinch->last_out(i);
|
|
uint uses_found = 0;
|
|
for (uint j = use->req(); j < use->len(); j++) {
|
|
if (use->in(j) == pinch) {
|
|
use->rm_prec(j);
|
|
uses_found++;
|
|
}
|
|
}
|
|
assert(uses_found > 0, "must be a precedence edge");
|
|
i -= uses_found; // we deleted 1 or more copies of this edge
|
|
}
|
|
// May have a later_def entry
|
|
pinch->set_req(0, NULL);
|
|
}
|
|
|
|
//------------------------------print_statistics-------------------------------
|
|
#ifndef PRODUCT
|
|
|
|
void Scheduling::dump_available() const {
|
|
tty->print("#Availist ");
|
|
for (uint i = 0; i < _available.size(); i++)
|
|
tty->print(" N%d/l%d", _available[i]->_idx,_current_latency[_available[i]->_idx]);
|
|
tty->cr();
|
|
}
|
|
|
|
// Print Scheduling Statistics
|
|
void Scheduling::print_statistics() {
|
|
// Print the size added by nops for bundling
|
|
tty->print("Nops added %d bytes to total of %d bytes",
|
|
_total_nop_size, _total_method_size);
|
|
if (_total_method_size > 0)
|
|
tty->print(", for %.2f%%",
|
|
((double)_total_nop_size) / ((double) _total_method_size) * 100.0);
|
|
tty->print("\n");
|
|
|
|
// Print the number of branch shadows filled
|
|
if (Pipeline::_branch_has_delay_slot) {
|
|
tty->print("Of %d branches, %d had unconditional delay slots filled",
|
|
_total_branches, _total_unconditional_delays);
|
|
if (_total_branches > 0)
|
|
tty->print(", for %.2f%%",
|
|
((double)_total_unconditional_delays) / ((double)_total_branches) * 100.0);
|
|
tty->print("\n");
|
|
}
|
|
|
|
uint total_instructions = 0, total_bundles = 0;
|
|
|
|
for (uint i = 1; i <= Pipeline::_max_instrs_per_cycle; i++) {
|
|
uint bundle_count = _total_instructions_per_bundle[i];
|
|
total_instructions += bundle_count * i;
|
|
total_bundles += bundle_count;
|
|
}
|
|
|
|
if (total_bundles > 0)
|
|
tty->print("Average ILP (excluding nops) is %.2f\n",
|
|
((double)total_instructions) / ((double)total_bundles));
|
|
}
|
|
#endif
|