--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir/src/org/graalvm/compiler/lir/alloc/trace/TraceRegisterAllocationPhase.java Mon Dec 10 16:49:54 2018 -0500
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,132 +0,0 @@
-/*
- * Copyright (c) 2015, 2015, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-
-
-package org.graalvm.compiler.lir.alloc.trace;
-
-import org.graalvm.compiler.core.common.alloc.RegisterAllocationConfig;
-import org.graalvm.compiler.core.common.alloc.Trace;
-import org.graalvm.compiler.core.common.alloc.TraceBuilderResult;
-import org.graalvm.compiler.core.common.cfg.AbstractBlockBase;
-import org.graalvm.compiler.debug.CounterKey;
-import org.graalvm.compiler.debug.DebugContext;
-import org.graalvm.compiler.debug.Indent;
-import org.graalvm.compiler.lir.LIR;
-import org.graalvm.compiler.lir.alloc.RegisterAllocationPhase;
-import org.graalvm.compiler.lir.alloc.trace.TraceAllocationPhase.TraceAllocationContext;
-import org.graalvm.compiler.lir.gen.LIRGenerationResult;
-import org.graalvm.compiler.lir.gen.LIRGeneratorTool.MoveFactory;
-import org.graalvm.compiler.lir.ssa.SSAUtil;
-import org.graalvm.compiler.options.Option;
-import org.graalvm.compiler.options.OptionKey;
-import org.graalvm.compiler.options.OptionType;
-
-import jdk.vm.ci.code.TargetDescription;
-import jdk.vm.ci.meta.AllocatableValue;
-
-/**
- * Implements the Trace Register Allocation approach as described in
- * <a href="http://dx.doi.org/10.1145/2972206.2972211">"Trace-based Register Allocation in a JIT
- * Compiler"</a> by Josef Eisl et al.
- */
-public final class TraceRegisterAllocationPhase extends RegisterAllocationPhase {
-
- public static class Options {
- // @formatter:off
- @Option(help = "Use inter-trace register hints.", type = OptionType.Debug)
- public static final OptionKey<Boolean> TraceRAuseInterTraceHints = new OptionKey<>(true);
- @Option(help = "Share information about spilled values to other traces.", type = OptionType.Debug)
- public static final OptionKey<Boolean> TraceRAshareSpillInformation = new OptionKey<>(true);
- @Option(help = "Reuse spill slots for global move resolution cycle breaking.", type = OptionType.Debug)
- public static final OptionKey<Boolean> TraceRAreuseStackSlotsForMoveResolutionCycleBreaking = new OptionKey<>(true);
- @Option(help = "Cache stack slots globally (i.e. a variable always gets the same slot in every trace).", type = OptionType.Debug)
- public static final OptionKey<Boolean> TraceRACacheStackSlots = new OptionKey<>(true);
- // @formatter:on
- }
-
- private static final CounterKey tracesCounter = DebugContext.counter("TraceRA[traces]");
-
- public static final CounterKey globalStackSlots = DebugContext.counter("TraceRA[GlobalStackSlots]");
- public static final CounterKey allocatedStackSlots = DebugContext.counter("TraceRA[AllocatedStackSlots]");
-
- private final TraceBuilderPhase traceBuilder;
- private final GlobalLivenessAnalysisPhase livenessAnalysis;
-
- public TraceRegisterAllocationPhase() {
- this.traceBuilder = new TraceBuilderPhase();
- this.livenessAnalysis = new GlobalLivenessAnalysisPhase();
- }
-
- @Override
- @SuppressWarnings("try")
- protected void run(TargetDescription target, LIRGenerationResult lirGenRes, AllocationContext context) {
- traceBuilder.apply(target, lirGenRes, context);
- livenessAnalysis.apply(target, lirGenRes, context);
-
- MoveFactory spillMoveFactory = context.spillMoveFactory;
- RegisterAllocationConfig registerAllocationConfig = context.registerAllocationConfig;
- LIR lir = lirGenRes.getLIR();
- DebugContext debug = lir.getDebug();
- TraceBuilderResult resultTraces = context.contextLookup(TraceBuilderResult.class);
- GlobalLivenessInfo livenessInfo = context.contextLookup(GlobalLivenessInfo.class);
- assert livenessInfo != null;
- TraceAllocationContext traceContext = new TraceAllocationContext(spillMoveFactory, registerAllocationConfig, resultTraces, livenessInfo);
- AllocatableValue[] cachedStackSlots = Options.TraceRACacheStackSlots.getValue(lir.getOptions()) ? new AllocatableValue[lir.numVariables()] : null;
-
- boolean neverSpillConstant = getNeverSpillConstants();
- assert !neverSpillConstant : "currently this is not supported";
-
- final TraceRegisterAllocationPolicy plan = DefaultTraceRegisterAllocationPolicy.allocationPolicy(target, lirGenRes, spillMoveFactory, registerAllocationConfig, cachedStackSlots, resultTraces,
- neverSpillConstant, livenessInfo, lir.getOptions());
-
- try (DebugContext.Scope s0 = debug.scope("AllocateTraces", resultTraces, livenessInfo)) {
- for (Trace trace : resultTraces.getTraces()) {
- tracesCounter.increment(debug);
- TraceAllocationPhase<TraceAllocationContext> allocator = plan.selectStrategy(trace);
- try (Indent i = debug.logAndIndent("Allocating Trace%d: %s (%s)", trace.getId(), trace, allocator); DebugContext.Scope s = debug.scope("AllocateTrace", trace)) {
- allocator.apply(target, lirGenRes, trace, traceContext);
- }
- }
- } catch (Throwable e) {
- throw debug.handle(e);
- }
-
- TraceGlobalMoveResolutionPhase.resolve(target, lirGenRes, traceContext);
- deconstructSSAForm(lir);
- }
-
- /**
- * Remove Phi In/Out.
- */
- private static void deconstructSSAForm(LIR lir) {
- for (AbstractBlockBase<?> block : lir.getControlFlowGraph().getBlocks()) {
- if (SSAUtil.isMerge(block)) {
- SSAUtil.phiIn(lir, block).clearIncomingValues();
- for (AbstractBlockBase<?> pred : block.getPredecessors()) {
- SSAUtil.phiOut(lir, pred).clearOutgoingValues();
- }
- }
- }
- }
-
-}