1 /*
2 * Copyright (c) 2015, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package org.graalvm.compiler.lir.alloc.trace;
24
25 import static org.graalvm.compiler.lir.LIRValueUtil.isStackSlotValue;
26 import static org.graalvm.compiler.lir.alloc.trace.TraceUtil.asShadowedRegisterValue;
27 import static org.graalvm.compiler.lir.alloc.trace.TraceUtil.isShadowedRegisterValue;
28 import static jdk.vm.ci.code.ValueUtil.asRegisterValue;
29 import static jdk.vm.ci.code.ValueUtil.isIllegal;
30 import static jdk.vm.ci.code.ValueUtil.isRegister;
31
32 import java.util.List;
33
34 import org.graalvm.compiler.core.common.alloc.Trace;
35 import org.graalvm.compiler.core.common.alloc.TraceBuilderResult;
36 import org.graalvm.compiler.core.common.cfg.AbstractBlockBase;
37 import org.graalvm.compiler.debug.Debug;
38 import org.graalvm.compiler.debug.Indent;
39 import org.graalvm.compiler.lir.LIR;
40 import org.graalvm.compiler.lir.LIRInstruction;
41 import org.graalvm.compiler.lir.alloc.trace.TraceAllocationPhase.TraceAllocationContext;
42 import org.graalvm.compiler.lir.gen.LIRGenerationResult;
43 import org.graalvm.compiler.lir.gen.LIRGeneratorTool.MoveFactory;
44 import org.graalvm.compiler.lir.phases.LIRPhase;
45 import org.graalvm.compiler.lir.ssa.SSAUtil.PhiValueVisitor;
46 import org.graalvm.compiler.lir.ssi.SSIUtil;
47
48 import jdk.vm.ci.code.Architecture;
49 import jdk.vm.ci.code.RegisterValue;
50 import jdk.vm.ci.code.TargetDescription;
51 import jdk.vm.ci.meta.AllocatableValue;
52 import jdk.vm.ci.meta.Value;
53
54 public final class TraceGlobalMoveResolutionPhase extends LIRPhase<TraceAllocationPhase.TraceAllocationContext> {
55
56 /**
57 * Abstract move resolver interface for testing.
58 */
59 public abstract static class MoveResolver {
60 public abstract void addMapping(Value src, AllocatableValue dst, Value fromStack);
61 }
62
63 @Override
64 protected void run(TargetDescription target, LIRGenerationResult lirGenRes, TraceAllocationContext context) {
65 MoveFactory spillMoveFactory = context.spillMoveFactory;
66 resolveGlobalDataFlow(context.resultTraces, lirGenRes, spillMoveFactory, target.arch);
67 }
68
69 @SuppressWarnings("try")
70 private static void resolveGlobalDataFlow(TraceBuilderResult resultTraces, LIRGenerationResult lirGenRes, MoveFactory spillMoveFactory, Architecture arch) {
71 LIR lir = lirGenRes.getLIR();
72 /* Resolve trace global data-flow mismatch. */
73 TraceGlobalMoveResolver moveResolver = new TraceGlobalMoveResolver(lirGenRes, spillMoveFactory, arch);
74 PhiValueVisitor visitor = (Value phiIn, Value phiOut) -> {
75 if (!isIllegal(phiIn)) {
76 addMapping(moveResolver, phiOut, phiIn);
77 }
78 };
79
80 try (Indent indent = Debug.logAndIndent("Trace global move resolution")) {
81 for (Trace trace : resultTraces.getTraces()) {
82 for (AbstractBlockBase<?> fromBlock : trace.getBlocks()) {
83 for (AbstractBlockBase<?> toBlock : fromBlock.getSuccessors()) {
84 if (resultTraces.getTraceForBlock(fromBlock) != resultTraces.getTraceForBlock(toBlock)) {
85 try (Indent indent0 = Debug.logAndIndent("Handle trace edge from %s (Trace%d) to %s (Trace%d)", fromBlock, resultTraces.getTraceForBlock(fromBlock).getId(), toBlock,
86 resultTraces.getTraceForBlock(toBlock).getId())) {
87
88 final List<LIRInstruction> instructions;
89 final int insertIdx;
90 if (fromBlock.getSuccessorCount() == 1) {
91 instructions = lir.getLIRforBlock(fromBlock);
92 insertIdx = instructions.size() - 1;
93 } else {
94 assert toBlock.getPredecessorCount() == 1;
95 instructions = lir.getLIRforBlock(toBlock);
96 insertIdx = 1;
97 }
98
99 moveResolver.setInsertPosition(instructions, insertIdx);
100 SSIUtil.forEachValuePair(lir, toBlock, fromBlock, visitor);
101 moveResolver.resolveAndAppendMoves();
102 }
103 }
104 }
105 }
106 }
107 }
108 }
109
110 public static void addMapping(MoveResolver moveResolver, Value from, Value to) {
111 assert !isIllegal(to);
112 if (isShadowedRegisterValue(to)) {
113 ShadowedRegisterValue toSh = asShadowedRegisterValue(to);
114 addMappingToRegister(moveResolver, from, toSh.getRegister());
115 addMappingToStackSlot(moveResolver, from, toSh.getStackSlot());
116 } else {
117 if (isRegister(to)) {
118 addMappingToRegister(moveResolver, from, asRegisterValue(to));
119 } else {
120 assert isStackSlotValue(to) : "Expected stack slot: " + to;
121 addMappingToStackSlot(moveResolver, from, (AllocatableValue) to);
122 }
123 }
124 }
125
126 private static void addMappingToRegister(MoveResolver moveResolver, Value from, RegisterValue register) {
127 if (isShadowedRegisterValue(from)) {
128 RegisterValue fromReg = asShadowedRegisterValue(from).getRegister();
129 AllocatableValue fromStack = asShadowedRegisterValue(from).getStackSlot();
130 checkAndAddMapping(moveResolver, fromReg, register, fromStack);
131 } else {
132 checkAndAddMapping(moveResolver, from, register, null);
133 }
134 }
135
136 private static void addMappingToStackSlot(MoveResolver moveResolver, Value from, AllocatableValue stack) {
137 if (isShadowedRegisterValue(from)) {
138 ShadowedRegisterValue shadowedFrom = asShadowedRegisterValue(from);
139 RegisterValue fromReg = shadowedFrom.getRegister();
140 AllocatableValue fromStack = shadowedFrom.getStackSlot();
141 if (!fromStack.equals(stack)) {
142 checkAndAddMapping(moveResolver, fromReg, stack, fromStack);
143 }
144 } else {
145 checkAndAddMapping(moveResolver, from, stack, null);
146 }
147
148 }
149
150 private static void checkAndAddMapping(MoveResolver moveResolver, Value from, AllocatableValue to, AllocatableValue fromStack) {
151 if (!from.equals(to) && (fromStack == null || !fromStack.equals(to))) {
152 moveResolver.addMapping(from, to, fromStack);
153 }
154 }
155 }