| /* |
| * 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.core.common.util; |
| |
| /** |
| * Provides low-level sequential write access for signed and unsigned values of size 1, 2, 4, and 8 |
| * bytes. |
| */ |
| public interface TypeWriter { |
| |
| /** |
| * Returns the number of bytes that have been written, i.e., the byte index of the next byte to |
| * be written. |
| */ |
| long getBytesWritten(); |
| |
| /** Writes a signed 1 byte value. */ |
| void putS1(long value); |
| |
| /** Writes an unsigned 1 byte value. */ |
| void putU1(long value); |
| |
| /** Writes a signed 2 byte value. */ |
| void putS2(long value); |
| |
| /** Writes an unsigned 2 byte value. */ |
| void putU2(long value); |
| |
| /** Writes a signed 4 byte value. */ |
| void putS4(long value); |
| |
| /** Writes an unsigned 4 byte value. */ |
| void putU4(long value); |
| |
| /** Writes a signed 8 byte value. */ |
| void putS8(long value); |
| |
| /** |
| * Writes a signed value in a variable byte size encoding. |
| */ |
| default void putSV(long value) { |
| long cur = value; |
| while (true) { |
| if (cur >= -64 && cur < 64) { |
| putU1(cur & 0x7f); |
| return; |
| } |
| putU1(0x80 | (cur & 0x7f)); |
| cur = cur >> 7; |
| } |
| } |
| |
| /** |
| * Writes an unsigned value in a variable byte size encoding. |
| */ |
| default void putUV(long value) { |
| long cur = value; |
| while (true) { |
| assert cur >= 0; |
| if (cur < 128) { |
| putU1(cur & 0x7f); |
| return; |
| } |
| putU1(0x80 | (cur & 0x7f)); |
| cur = cur >> 7; |
| } |
| } |
| } |