1/*
2 * Copyright (c) 2016, 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 */
23package org.graalvm.compiler.core.common.alloc;
24
25import java.util.ArrayList;
26
27import org.graalvm.compiler.core.common.alloc.TraceBuilderResult.TrivialTracePredicate;
28import org.graalvm.compiler.core.common.cfg.AbstractBlockBase;
29import org.graalvm.compiler.debug.DebugContext;
30
31/**
32 * Builds traces consisting of a single basic block.
33 */
34public final class SingleBlockTraceBuilder {
35
36    public static TraceBuilderResult computeTraces(DebugContext debug, AbstractBlockBase<?> startBlock, AbstractBlockBase<?>[] blocks, TrivialTracePredicate pred) {
37        return build(debug, startBlock, blocks, pred);
38    }
39
40    private static TraceBuilderResult build(DebugContext debug, AbstractBlockBase<?> startBlock, AbstractBlockBase<?>[] blocks, TrivialTracePredicate pred) {
41        Trace[] blockToTrace = new Trace[blocks.length];
42        ArrayList<Trace> traces = new ArrayList<>(blocks.length);
43
44        for (AbstractBlockBase<?> block : blocks) {
45            Trace trace = new Trace(new AbstractBlockBase<?>[]{block});
46            blockToTrace[block.getId()] = trace;
47            block.setLinearScanNumber(0);
48            trace.setId(traces.size());
49            traces.add(trace);
50        }
51
52        assert traces.get(0).getBlocks()[0].equals(startBlock) : "The first traces always contains the start block";
53        return TraceBuilderResult.create(debug, blocks, traces, blockToTrace, pred);
54    }
55
56}
57