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author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Fri, 06 May 2011 10:25:37 +0200 |
parents | 16b9a8b5ad39 |
children | f9ae687657e8 |
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/* * Copyright (c) 2009, 2011, 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 com.sun.c1x.util; import java.util.*; import com.sun.c1x.*; import com.sun.c1x.debug.*; import com.sun.c1x.ir.*; import com.sun.cri.ci.*; import com.sun.cri.ri.*; /** * The {@code Util} class contains a motley collection of utility methods used throughout the compiler. * * @author Ben L. Titzer * @author Doug Simon */ public class Util { public static final int PRINTING_LINE_WIDTH = 40; public static final char SECTION_CHARACTER = '*'; public static final char SUB_SECTION_CHARACTER = '='; public static final char SEPERATOR_CHARACTER = '-'; public static RuntimeException unimplemented() { throw new InternalError("unimplemented"); } public static RuntimeException unimplemented(String msg) { throw new InternalError("unimplemented:" + msg); } public static RuntimeException shouldNotReachHere() { throw new InternalError("should not reach here"); } public static RuntimeException shouldNotReachHere(String msg) { throw new InternalError("Should not reach here: " + msg); } public static <T> boolean replaceInList(T a, T b, List<T> list) { final int max = list.size(); for (int i = 0; i < max; i++) { if (list.get(i) == a) { list.set(i, b); return true; } } return false; } public static <T> boolean replaceAllInList(T a, T b, List<T> list) { final int max = list.size(); for (int i = 0; i < max; i++) { if (list.get(i) == a) { list.set(i, b); } } return false; } /** * Statically cast an object to an arbitrary Object type. Dynamically checked. */ @SuppressWarnings("unchecked") public static <T> T uncheckedCast(Class<T> type, Object object) { return (T) object; } /** * Statically cast an object to an arbitrary Object type. Dynamically checked. */ @SuppressWarnings("unchecked") public static <T> T uncheckedCast(Object object) { return (T) object; } /** * Utility method to combine a base hash with the identity hash of one or more objects. * * @param hash the base hash * @param x the object to add to the hash * @return the combined hash */ public static int hash1(int hash, Object x) { // always set at least one bit in case the hash wraps to zero return 0x10000000 | (hash + 7 * System.identityHashCode(x)); } /** * Utility method to combine a base hash with the identity hash of one or more objects. * * @param hash the base hash * @param x the first object to add to the hash * @param y the second object to add to the hash * @return the combined hash */ public static int hash2(int hash, Object x, Object y) { // always set at least one bit in case the hash wraps to zero return 0x20000000 | (hash + 7 * System.identityHashCode(x) + 11 * System.identityHashCode(y)); } /** * Utility method to combine a base hash with the identity hash of one or more objects. * * @param hash the base hash * @param x the first object to add to the hash * @param y the second object to add to the hash * @param z the third object to add to the hash * @return the combined hash */ public static int hash3(int hash, Object x, Object y, Object z) { // always set at least one bit in case the hash wraps to zero return 0x30000000 | (hash + 7 * System.identityHashCode(x) + 11 * System.identityHashCode(y) + 13 * System.identityHashCode(z)); } /** * Utility method to combine a base hash with the identity hash of one or more objects. * * @param hash the base hash * @param x the first object to add to the hash * @param y the second object to add to the hash * @param z the third object to add to the hash * @param w the fourth object to add to the hash * @return the combined hash */ public static int hash4(int hash, Object x, Object y, Object z, Object w) { // always set at least one bit in case the hash wraps to zero return 0x40000000 | (hash + 7 * System.identityHashCode(x) + 11 * System.identityHashCode(y) + 13 * System.identityHashCode(z) + 17 * System.identityHashCode(w)); } static { assert CiUtil.log2(2) == 1; assert CiUtil.log2(4) == 2; assert CiUtil.log2(8) == 3; assert CiUtil.log2(16) == 4; assert CiUtil.log2(32) == 5; assert CiUtil.log2(0x40000000) == 30; assert CiUtil.log2(2L) == 1; assert CiUtil.log2(4L) == 2; assert CiUtil.log2(8L) == 3; assert CiUtil.log2(16L) == 4; assert CiUtil.log2(32L) == 5; assert CiUtil.log2(0x4000000000000000L) == 62; assert !CiUtil.isPowerOf2(3); assert !CiUtil.isPowerOf2(5); assert !CiUtil.isPowerOf2(7); assert !CiUtil.isPowerOf2(-1); assert CiUtil.isPowerOf2(2); assert CiUtil.isPowerOf2(4); assert CiUtil.isPowerOf2(8); assert CiUtil.isPowerOf2(16); assert CiUtil.isPowerOf2(32); assert CiUtil.isPowerOf2(64); } /** * Sets the element at a given position of a list and ensures that this position exists. If the list is current * shorter than the position, intermediate positions are filled with a given value. * * @param list the list to put the element into * @param pos the position at which to insert the element * @param x the element that should be inserted * @param filler the filler element that is used for the intermediate positions in case the list is shorter than pos */ public static <T> void atPutGrow(List<T> list, int pos, T x, T filler) { if (list.size() < pos + 1) { while (list.size() < pos + 1) { list.add(filler); } assert list.size() == pos + 1; } assert list.size() >= pos + 1; list.set(pos, x); } public static void breakpoint() { // do nothing. } public static void guarantee(boolean b, String string) { if (!b) { throw new CiBailout(string); } } public static void warning(String string) { TTY.println("WARNING: " + string); } public static int safeToInt(long l) { assert (int) l == l; return (int) l; } public static int roundUp(int number, int mod) { return ((number + mod - 1) / mod) * mod; } public static void truncate(List<?> list, int length) { while (list.size() > length) { list.remove(list.size() - 1); } } public static void printSection(String name, char sectionCharacter) { String header = " " + name + " "; int remainingCharacters = PRINTING_LINE_WIDTH - header.length(); int leftPart = remainingCharacters / 2; int rightPart = remainingCharacters - leftPart; for (int i = 0; i < leftPart; i++) { TTY.print(sectionCharacter); } TTY.print(header); for (int i = 0; i < rightPart; i++) { TTY.print(sectionCharacter); } TTY.println(); } /** * Prints entries in a byte array as space separated hex values to {@link TTY}. * * @param address an address at which the bytes are located. This is used to print an address prefix per line of output. * @param array the array containing all the bytes to print * @param bytesPerLine the number of values to print per line of output */ public static void printBytes(long address, byte[] array, int bytesPerLine) { printBytes(address, array, 0, array.length, bytesPerLine); } /** * Prints entries in a byte array as space separated hex values to {@link TTY}. * * @param address an address at which the bytes are located. This is used to print an address prefix per line of output. * @param array the array containing the bytes to print * @param offset the offset in {@code array} of the values to print * @param length the number of values from {@code array} print * @param bytesPerLine the number of values to print per line of output */ public static void printBytes(long address, byte[] array, int offset, int length, int bytesPerLine) { assert bytesPerLine > 0; boolean newLine = true; for (int i = 0; i < length; i++) { if (newLine) { TTY.print("%08x: ", address + i); newLine = false; } TTY.print("%02x ", array[i]); if (i % bytesPerLine == bytesPerLine - 1) { TTY.println(); newLine = true; } } if (length % bytesPerLine != bytesPerLine) { TTY.println(); } } public static CiKind[] signatureToKinds(RiSignature signature, CiKind receiverKind) { int args = signature.argumentCount(false); CiKind[] result; int i = 0; if (receiverKind != null) { result = new CiKind[args + 1]; result[0] = receiverKind; i = 1; } else { result = new CiKind[args]; } for (int j = 0; j < args; j++) { result[i + j] = signature.argumentKindAt(j); } return result; } public static <T> T nonFatalUnimplemented(T val) { if (C1XOptions.FatalUnimplemented) { throw new Error("unimplemented"); } return val; } public static void nonFatalUnimplemented() { if (C1XOptions.FatalUnimplemented) { throw new Error("unimplemented"); } } public static boolean isShiftCount(int x) { return 0 <= x && x < 32; } /** * Determines if a given {@code int} value is the range of unsigned byte values. */ public static boolean isUByte(int x) { return (x & 0xff) == x; } /** * Determines if a given {@code int} value is the range of signed byte values. */ public static boolean isByte(int x) { return (byte) x == x; } /** * Determines if a given {@code long} value is the range of unsigned byte values. */ public static boolean isUByte(long x) { return (x & 0xffL) == x; } /** * Determines if a given {@code long} value is the range of signed byte values. */ public static boolean isByte(long l) { return (byte) l == l; } /** * Determines if a given {@code long} value is the range of unsigned int values. */ public static boolean isUInt(long x) { return (x & 0xffffffffL) == x; } /** * Determines if a given {@code long} value is the range of signed int values. */ public static boolean isInt(long l) { return (int) l == l; } /** * Determines if a given {@code int} value is the range of signed short values. */ public static boolean isShort(int x) { return (short) x == x; } public static boolean is32bit(long x) { return -0x80000000L <= x && x < 0x80000000L; } public static short safeToShort(int v) { assert isShort(v); return (short) v; } /** * Determines if the kinds of two given IR nodes are equal at the {@linkplain #archKind(CiKind) architecture} * level in the context of the {@linkplain C1XCompilation#compilation()} compilation. */ public static boolean archKindsEqual(Value i, Value other) { return archKindsEqual(i.kind, other.kind); } /** * Determines if two given kinds are equal at the {@linkplain #archKind(CiKind) architecture} level * in the context of the {@linkplain C1XCompilation#compilation()} compilation. */ public static boolean archKindsEqual(CiKind k1, CiKind k2) { C1XCompilation compilation = C1XCompilation.compilation(); assert compilation != null : "missing compilation context"; return compilation.archKindsEqual(k1, k2); } /** * Translates a given kind to a {@linkplain C1XCompilation#archKind(CiKind) canonical architecture} * kind in the context of the {@linkplain C1XCompilation#compilation() current} compilation. */ public static CiKind archKind(CiKind kind) { C1XCompilation compilation = C1XCompilation.compilation(); assert compilation != null : "missing compilation context"; return compilation.archKind(kind); } /** * Checks that two instructions are equivalent, optionally comparing constants. * @param x the first instruction * @param y the second instruction * @param compareConstants {@code true} if equivalent constants should be considered equivalent * @return {@code true} if the instructions are equivalent; {@code false} otherwise */ public static boolean equivalent(Instruction x, Instruction y, boolean compareConstants) { if (x == y) { return true; } if (compareConstants && x != null && y != null) { if (x.isConstant() && x.asConstant().equivalent(y.asConstant())) { return true; } } return false; } /** * Converts a given instruction to a value string. The representation of an instruction as * a value is formed by concatenating the {@linkplain com.sun.cri.ci.CiKind#typeChar character} denoting its * {@linkplain Value#kind kind} and its {@linkplain Value#id()}. For example, {@code "i13"}. * * @param value the instruction to convert to a value string. If {@code value == null}, then "-" is returned. * @return the instruction representation as a string */ public static String valueString(Value value) { return value == null ? "-" : "" + value.kind.typeChar + value.id(); } }