| /* |
| * 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.Debug; |
| import org.graalvm.compiler.debug.Debug.Scope; |
| import org.graalvm.compiler.debug.DebugCounter; |
| import org.graalvm.compiler.debug.Indent; |
| import org.graalvm.compiler.lir.LIR; |
| import org.graalvm.compiler.lir.LIRInstruction; |
| 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.phases.AllocationPhase; |
| import org.graalvm.compiler.lir.ssi.SSIUtil; |
| import org.graalvm.compiler.lir.ssi.SSIVerifier; |
| import org.graalvm.compiler.options.Option; |
| import org.graalvm.compiler.options.OptionType; |
| import org.graalvm.compiler.options.StableOptionValue; |
| |
| 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 AllocationPhase { |
| |
| public static class Options { |
| // @formatter:off |
| @Option(help = "Use inter-trace register hints.", type = OptionType.Debug) |
| public static final StableOptionValue<Boolean> TraceRAuseInterTraceHints = new StableOptionValue<>(true); |
| @Option(help = "Share information about spilled values to other traces.", type = OptionType.Debug) |
| public static final StableOptionValue<Boolean> TraceRAshareSpillInformation = new StableOptionValue<>(true); |
| @Option(help = "Reuse spill slots for global move resolution cycle breaking.", type = OptionType.Debug) |
| public static final StableOptionValue<Boolean> TraceRAreuseStackSlotsForMoveResolutionCycleBreaking = new StableOptionValue<>(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 StableOptionValue<Boolean> TraceRACacheStackSlots = new StableOptionValue<>(true); |
| // @formatter:on |
| } |
| |
| private static final TraceGlobalMoveResolutionPhase TRACE_GLOBAL_MOVE_RESOLUTION_PHASE = new TraceGlobalMoveResolutionPhase(); |
| |
| private static final DebugCounter tracesCounter = Debug.counter("TraceRA[traces]"); |
| |
| public static final DebugCounter globalStackSlots = Debug.counter("TraceRA[GlobalStackSlots]"); |
| public static final DebugCounter allocatedStackSlots = Debug.counter("TraceRA[AllocatedStackSlots]"); |
| |
| @Override |
| @SuppressWarnings("try") |
| protected void run(TargetDescription target, LIRGenerationResult lirGenRes, AllocationContext context) { |
| MoveFactory spillMoveFactory = context.spillMoveFactory; |
| RegisterAllocationConfig registerAllocationConfig = context.registerAllocationConfig; |
| LIR lir = lirGenRes.getLIR(); |
| assert SSIVerifier.verify(lir) : "LIR not in SSI form."; |
| TraceBuilderResult resultTraces = context.contextLookup(TraceBuilderResult.class); |
| |
| TraceAllocationContext traceContext = new TraceAllocationContext(spillMoveFactory, registerAllocationConfig, resultTraces); |
| AllocatableValue[] cachedStackSlots = Options.TraceRACacheStackSlots.getValue() ? new AllocatableValue[lir.numVariables()] : null; |
| |
| // currently this is not supported |
| boolean neverSpillConstant = false; |
| |
| final TraceRegisterAllocationPolicy plan = DefaultTraceRegisterAllocationPolicy.allocationPolicy(target, lirGenRes, spillMoveFactory, registerAllocationConfig, cachedStackSlots, |
| resultTraces, neverSpillConstant); |
| |
| Debug.dump(Debug.INFO_LOG_LEVEL, lir, "Before TraceRegisterAllocation"); |
| try (Scope s0 = Debug.scope("AllocateTraces", resultTraces)) { |
| for (Trace trace : resultTraces.getTraces()) { |
| tracesCounter.increment(); |
| TraceAllocationPhase<TraceAllocationContext> allocator = plan.selectStrategy(trace); |
| try (Indent i = Debug.logAndIndent("Allocating Trace%d: %s (%s)", trace.getId(), trace, allocator); Scope s = Debug.scope("AllocateTrace", trace)) { |
| allocator.apply(target, lirGenRes, trace, traceContext); |
| } |
| } |
| } catch (Throwable e) { |
| throw Debug.handle(e); |
| } |
| if (Debug.isDumpEnabled(Debug.INFO_LOG_LEVEL)) { |
| unnumberInstructions(lir); |
| Debug.dump(Debug.INFO_LOG_LEVEL, lir, "After trace allocation"); |
| } |
| |
| TRACE_GLOBAL_MOVE_RESOLUTION_PHASE.apply(target, lirGenRes, traceContext); |
| deconstructSSIForm(lir); |
| } |
| |
| /** |
| * Remove Phi/Sigma In/Out. |
| * |
| * Note: Incoming Values are needed for the RegisterVerifier, otherwise SIGMAs/PHIs where the |
| * Out and In value matches (ie. there is no resolution move) are falsely detected as errors. |
| */ |
| @SuppressWarnings("try") |
| private static void deconstructSSIForm(LIR lir) { |
| for (AbstractBlockBase<?> block : lir.getControlFlowGraph().getBlocks()) { |
| try (Indent i = Debug.logAndIndent("Fixup Block %s", block)) { |
| if (block.getPredecessorCount() != 0) { |
| SSIUtil.removeIncoming(lir, block); |
| } else { |
| assert lir.getControlFlowGraph().getStartBlock().equals(block); |
| } |
| SSIUtil.removeOutgoing(lir, block); |
| } |
| } |
| } |
| |
| private static void unnumberInstructions(LIR lir) { |
| for (AbstractBlockBase<?> block : lir.getControlFlowGraph().getBlocks()) { |
| for (LIRInstruction op : lir.getLIRforBlock(block)) { |
| op.setId(-1); |
| } |
| } |
| } |
| } |