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 * 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
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package org.graalvm.compiler.lir.alloc.trace;

import java.util.ArrayList;

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.lir.LIR;
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 jdk.vm.ci.code.TargetDescription;
import jdk.vm.ci.common.JVMCIError;
import jdk.vm.ci.meta.AllocatableValue;

Manages the selection of allocation strategies.
/** * Manages the selection of allocation strategies. */
public final class TraceRegisterAllocationPolicy { protected abstract class AllocationStrategy { TraceAllocationPhase<TraceAllocationContext> allocator; public final TraceAllocationPhase<TraceAllocationContext> getAllocator() { if (allocator == null) { allocator = initAllocator(target, lirGenRes, spillMoveFactory, registerAllocationConfig, cachedStackSlots, resultTraces, neverSpillConstants, strategies); } return allocator; } protected final LIR getLIR() { return lirGenRes.getLIR(); } protected final LIRGenerationResult getLIRGenerationResult() { return lirGenRes; } protected final TraceBuilderResult getTraceBuilderResult() { return resultTraces; }
Returns true if the allocation strategy should be used for trace.
/** * Returns {@code true} if the allocation strategy should be used for {@code trace}. */
public abstract boolean shouldApplyTo(Trace trace); @SuppressWarnings("hiding") protected abstract TraceAllocationPhase<TraceAllocationContext> initAllocator(TargetDescription target, LIRGenerationResult lirGenRes, MoveFactory spillMoveFactory, RegisterAllocationConfig registerAllocationConfig, AllocatableValue[] cachedStackSlots, TraceBuilderResult resultTraces, boolean neverSpillConstant, ArrayList<AllocationStrategy> strategies); } private final TargetDescription target; private final LIRGenerationResult lirGenRes; private final MoveFactory spillMoveFactory; private final RegisterAllocationConfig registerAllocationConfig; private final AllocatableValue[] cachedStackSlots; private final TraceBuilderResult resultTraces; private final boolean neverSpillConstants; private final ArrayList<AllocationStrategy> strategies; public TraceRegisterAllocationPolicy(TargetDescription target, LIRGenerationResult lirGenRes, MoveFactory spillMoveFactory, RegisterAllocationConfig registerAllocationConfig, AllocatableValue[] cachedStackSlots, TraceBuilderResult resultTraces, boolean neverSpillConstant) { this.target = target; this.lirGenRes = lirGenRes; this.spillMoveFactory = spillMoveFactory; this.registerAllocationConfig = registerAllocationConfig; this.cachedStackSlots = cachedStackSlots; this.resultTraces = resultTraces; this.neverSpillConstants = neverSpillConstant; this.strategies = new ArrayList<>(3); } public void appendStrategy(AllocationStrategy strategy) { strategies.add(strategy); } public TraceAllocationPhase<TraceAllocationContext> selectStrategy(Trace trace) { for (AllocationStrategy strategy : strategies) { if (strategy.shouldApplyTo(trace)) { return strategy.getAllocator(); } } throw JVMCIError.shouldNotReachHere("No Allocation Strategy found!"); } }