| /* |
| * 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.ssa; |
| |
| import static org.graalvm.compiler.lir.LIRValueUtil.isJavaConstant; |
| import static org.graalvm.compiler.lir.LIRValueUtil.isStackSlotValue; |
| import static jdk.vm.ci.code.ValueUtil.isRegister; |
| |
| import java.util.BitSet; |
| import java.util.EnumSet; |
| import java.util.HashMap; |
| |
| 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.Indent; |
| import org.graalvm.compiler.lir.InstructionValueConsumer; |
| import org.graalvm.compiler.lir.LIR; |
| import org.graalvm.compiler.lir.LIRInstruction; |
| import org.graalvm.compiler.lir.LIRInstruction.OperandFlag; |
| import org.graalvm.compiler.lir.LIRInstruction.OperandMode; |
| |
| import jdk.vm.ci.meta.Value; |
| |
| final class SSAVerifier { |
| private static class Entry { |
| private final LIRInstruction inst; |
| private final AbstractBlockBase<?> block; |
| |
| Entry(LIRInstruction inst, AbstractBlockBase<?> block) { |
| this.inst = inst; |
| this.block = block; |
| } |
| } |
| |
| private final LIR lir; |
| private final BitSet visited; |
| private final HashMap<Value, Entry> defined; |
| private AbstractBlockBase<?> currentBlock; |
| |
| SSAVerifier(LIR lir) { |
| this.lir = lir; |
| this.visited = new BitSet(lir.getControlFlowGraph().getBlocks().length); |
| this.defined = new HashMap<>(); |
| } |
| |
| @SuppressWarnings("try") |
| public boolean verify() { |
| try (Scope s = Debug.scope("SSAVerifier", lir)) { |
| for (AbstractBlockBase<?> block : lir.getControlFlowGraph().getBlocks()) { |
| doBlock(block); |
| } |
| } catch (Throwable e) { |
| throw Debug.handle(e); |
| } |
| return true; |
| } |
| |
| @SuppressWarnings("try") |
| private void doBlock(AbstractBlockBase<?> b) { |
| if (visited.get(b.getId())) { |
| return; |
| } |
| for (AbstractBlockBase<?> pred : b.getPredecessors()) { |
| if (!b.isLoopHeader() || !pred.isLoopEnd()) { |
| doBlock(pred); |
| } |
| } |
| try (Indent indent = Debug.logAndIndent(Debug.INFO_LOG_LEVEL, "handle block %s", b)) { |
| assert verifyBlock(b); |
| } |
| } |
| |
| private boolean verifyBlock(AbstractBlockBase<?> block) { |
| currentBlock = block; |
| assert !visited.get(block.getId()) : "Block already visited: " + block; |
| visited.set(block.getId()); |
| for (LIRInstruction op : lir.getLIRforBlock(block)) { |
| op.visitEachAlive(this::useConsumer); |
| op.visitEachState(this::useConsumer); |
| op.visitEachInput(this::useConsumer); |
| |
| op.visitEachTemp(this::defConsumer); |
| op.visitEachOutput(this::defConsumer); |
| |
| } |
| currentBlock = null; |
| return true; |
| } |
| |
| /** |
| * @see InstructionValueConsumer |
| * @param mode |
| * @param flags |
| */ |
| private void useConsumer(LIRInstruction inst, Value value, OperandMode mode, EnumSet<OperandFlag> flags) { |
| if (shouldProcess(value)) { |
| assert defined.keySet().contains(value) || flags.contains(OperandFlag.UNINITIALIZED) : String.format("Value %s used at instruction %s in block %s but never defined", value, inst, |
| currentBlock); |
| } |
| } |
| |
| /** |
| * @see InstructionValueConsumer |
| * @param mode |
| * @param flags |
| */ |
| private void defConsumer(LIRInstruction inst, Value value, OperandMode mode, EnumSet<OperandFlag> flags) { |
| if (shouldProcess(value)) { |
| assert !defined.keySet().contains(value) : String.format("Value %s redefined at %s but never defined (previous definition %s in block %s)", value, inst, defined.get(value).inst, |
| defined.get(value).block); |
| defined.put(value, new Entry(inst, currentBlock)); |
| } |
| } |
| |
| private static boolean shouldProcess(Value value) { |
| return !value.equals(Value.ILLEGAL) && !isJavaConstant(value) && !isRegister(value) && !isStackSlotValue(value); |
| } |
| |
| } |