Mercurial > hg > graal-jvmci-8
view jvmci/jdk.internal.jvmci.code/src/jdk/internal/jvmci/code/DataSection.java @ 22411:78c691145967
Support putting multiple constants next to each other in DataSection.
author | Roland Schatz <roland.schatz@oracle.com> |
---|---|
date | Mon, 10 Aug 2015 13:36:47 +0200 |
parents | 598c75a3d1d1 |
children | 0915f5bfdfaa 118f9560e0ea |
line wrap: on
line source
/* * Copyright (c) 2014, 2014, 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 jdk.internal.jvmci.code; import static jdk.internal.jvmci.meta.MetaUtil.*; import java.nio.*; import java.util.*; import java.util.function.*; import jdk.internal.jvmci.code.CompilationResult.*; import jdk.internal.jvmci.code.DataSection.*; import jdk.internal.jvmci.meta.*; public final class DataSection implements Iterable<Data> { @FunctionalInterface public interface DataBuilder { void emit(ByteBuffer buffer, Consumer<DataPatch> patch); static DataBuilder raw(byte[] data) { return (buffer, patch) -> buffer.put(data); } static DataBuilder serializable(SerializableConstant c) { return (buffer, patch) -> c.serialize(buffer); } static DataBuilder zero(int size) { switch (size) { case 1: return (buffer, patch) -> buffer.put((byte) 0); case 2: return (buffer, patch) -> buffer.putShort((short) 0); case 4: return (buffer, patch) -> buffer.putInt(0); case 8: return (buffer, patch) -> buffer.putLong(0L); default: return (buffer, patch) -> { int rest = size; while (rest > 8) { buffer.putLong(0L); rest -= 8; } while (rest > 0) { buffer.put((byte) 0); rest--; } }; } } } public static final class Data { private int alignment; private final int size; private final DataBuilder builder; private DataSectionReference ref; public Data(int alignment, int size, DataBuilder builder) { this.alignment = alignment; this.size = size; this.builder = builder; // initialized in DataSection.insertData(Data) ref = null; } public void updateAlignment(int newAlignment) { if (newAlignment == alignment) { return; } alignment = lcm(alignment, newAlignment); } public int getAlignment() { return alignment; } public int getSize() { return size; } public DataBuilder getBuilder() { return builder; } @Override public int hashCode() { // Data instances should not be used as hash map keys throw new UnsupportedOperationException("hashCode"); } @Override public String toString() { return identityHashCodeString(this); } @Override public boolean equals(Object obj) { assert ref != null; if (obj == this) { return true; } if (obj instanceof Data) { Data that = (Data) obj; if (this.alignment == that.alignment && this.size == that.size && this.ref.equals(that.ref)) { return true; } } return false; } } private final ArrayList<Data> dataItems = new ArrayList<>(); private boolean finalLayout; private int sectionAlignment; private int sectionSize; @Override public int hashCode() { // DataSection instances should not be used as hash map keys throw new UnsupportedOperationException("hashCode"); } @Override public String toString() { return identityHashCodeString(this); } @Override public boolean equals(Object obj) { if (this == obj) { return true; } if (obj instanceof DataSection) { DataSection that = (DataSection) obj; if (this.finalLayout == that.finalLayout && this.sectionAlignment == that.sectionAlignment && this.sectionSize == that.sectionSize && Objects.equals(this.dataItems, that.dataItems)) { return true; } } return false; } /** * Insert a {@link Data} item into the data section. If the item is already in the data section, * the same {@link DataSectionReference} is returned. * * @param data the {@link Data} item to be inserted * @return a unique {@link DataSectionReference} identifying the {@link Data} item */ public DataSectionReference insertData(Data data) { assert !finalLayout; if (data.ref == null) { data.ref = new DataSectionReference(); dataItems.add(data); } return data.ref; } /** * Compute the layout of the data section. This can be called only once, and after it has been * called, the data section can no longer be modified. */ public void finalizeLayout() { assert !finalLayout; finalLayout = true; // simple heuristic: put items with larger alignment requirement first dataItems.sort((a, b) -> a.alignment - b.alignment); int position = 0; for (Data d : dataItems) { sectionAlignment = lcm(sectionAlignment, d.alignment); position = align(position, d.alignment); d.ref.setOffset(position); position += d.size; } sectionSize = position; } /** * Get the size of the data section. Can only be called after {@link #finalizeLayout}. */ public int getSectionSize() { assert finalLayout; return sectionSize; } /** * Get the minimum alignment requirement of the data section. Can only be called after * {@link #finalizeLayout}. */ public int getSectionAlignment() { assert finalLayout; return sectionAlignment; } /** * Build the data section. Can only be called after {@link #finalizeLayout}. * * @param buffer The {@link ByteBuffer} where the data section should be built. The buffer must * hold at least {@link #getSectionSize()} bytes. * @param patch A {@link Consumer} to receive {@link DataPatch data patches} for relocations in * the data section. */ public void buildDataSection(ByteBuffer buffer, Consumer<DataPatch> patch) { assert finalLayout; for (Data d : dataItems) { buffer.position(d.ref.getOffset()); d.builder.emit(buffer, patch); } } public Data findData(DataSectionReference ref) { for (Data d : dataItems) { if (d.ref == ref) { return d; } } return null; } public Iterator<Data> iterator() { return dataItems.iterator(); } public static int lcm(int x, int y) { if (x == 0) { return y; } else if (y == 0) { return x; } int a = Math.max(x, y); int b = Math.min(x, y); while (b > 0) { int tmp = a % b; a = b; b = tmp; } int gcd = a; return x * y / gcd; } private static int align(int position, int alignment) { return ((position + alignment - 1) / alignment) * alignment; } public void clear() { assert !finalLayout; this.dataItems.clear(); this.sectionAlignment = 0; this.sectionSize = 0; } }