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view graal/com.oracle.truffle.api/src/com/oracle/truffle/api/source/SourceManager.java @ 14816:836d558c3a5f
Create Baseline version of doBlock in LIRGenerator.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Wed, 19 Mar 2014 15:14:37 +0100 |
parents | f150a67b99e3 |
children | c54f5fa05fd5 |
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/* * Copyright (c) 2013, 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. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * 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.oracle.truffle.api.source; import java.io.*; import java.util.*; import com.oracle.truffle.api.*; /** * A representation of source code information, suitable for hash table keys with equality defined * in terms of content. There are three kinds of sources supported at present. * <ul> * <li><strong>File:</strong> Each file is represented as a canonical object, indexed by the * absolute, canonical path name of the file. The textual contents of the file may be supplied when * the object is created, or it may be read lazily. Only one lazy attempt will be made to read a * file, and failure will result silently in null content.</li> * <li><strong>Literal Source:</strong> A named text string, whose contents are supplied concretely * (possibly via an {@link InputStream}), can also be used as a source. These are represented as * value objects whose equality depends on both name and contents.</li> * <li><strong>Fake Files:</strong> A named text string used for testing; its contents can be * retrieved by name, unlike literal sources.</li> * </ul> * <p> * <strong>Cache:</strong> * <ol> * <li>Access to source file contents via {@link Source#getInputStream()} or * {@link Source#getReader()} does <em>not</em> by itself result in the file's contents being cached * in the {@link Source} object.</li> * <li>Access to source file contents via {@link Source#getCode()} or any other {@link Source} * methods related to file's contents <em>will</em> result in the contents being cached in the * {@link Source} object.</li> * <li>Once source file contents have been cached, access to source file contents via * {@link Source#getInputStream()} or {@link Source#getReader()} will be provided from the cache.</li> * <li>Any access to source file contents via the cache will result in a timestamp check and * possible cache reload.</li> * </ol> */ public final class SourceManager { // Only files and fake files are indexed. private final Map<String, SourceImpl> pathToSource = new HashMap<>(); public SourceManager() { } /** * Gets the canonical representation of a source file, whose contents will be read lazily and * then cached. * * @param reset forces any existing {@link Source} cache to be cleared, forcing a re-read */ public Source get(String fileName, boolean reset) { SourceImpl source = pathToSource.get(fileName); if (source == null) { final File file = new File(fileName); String path = null; if (file.exists()) { try { path = file.getCanonicalPath(); } catch (IOException e) { throw new RuntimeException("Can't find file " + fileName); } } source = pathToSource.get(path); if (source == null) { source = new FileSourceImpl(file, fileName, path); pathToSource.put(path, source); } } if (reset) { source.reset(); } return source; } /** * Gets the canonical representation of a source file, whose contents will be read lazily and * then cached. */ public Source get(String fileName) { return get(fileName, false); } /** * Creates a source from literal text. */ @SuppressWarnings("static-method") public Source get(String name, String code) { assert code != null; return new LiteralSourceImpl(name, code); } /** * Creates a source whose contents will be read immediately and cached. */ @SuppressWarnings("static-method") public Source get(String name, InputStream stream) throws IOException { InputStreamReader reader = new InputStreamReader(stream); return new LiteralSourceImpl(name, readCode(reader)); } /** * Creates a source from literal text, but which acts as a file and can be retrieved by name * (unlike other literal sources); intended for testing. */ public Source getFakeFile(String name, String code) { final SourceImpl source = new LiteralSourceImpl(name, code); pathToSource.put(name, source); return source; } private static String readCode(Reader reader) throws IOException { final StringBuilder builder = new StringBuilder(); final char[] buffer = new char[1024]; while (true) { final int n = reader.read(buffer); if (n == -1) { break; } builder.append(buffer, 0, n); } return builder.toString(); } private abstract static class SourceImpl implements Source { protected TextMap textMap = null; protected abstract void reset(); public final InputStream getInputStream() { return new ByteArrayInputStream(getCode().getBytes()); } /** * Gets the text (not including a possible terminating newline) in a (1-based) numbered * line. */ public final String getCode(int lineNumber) { checkTextMap(); final int offset = textMap.lineStartOffset(lineNumber); final int length = textMap.lineLength(lineNumber); return getCode().substring(offset, offset + length); } /** * The number of text lines in the source. */ public final int getLineCount() { return checkTextMap().lineCount(); } /** * The 1-based number of the line that includes a 0-based character offset. */ public final int getLineNumber(int offset) { return checkTextMap().offsetToLine(offset); } /** * The 0-based character offset at the start of a (1-based) numbered line. */ public final int getLineStartOffset(int lineNumber) { return checkTextMap().lineStartOffset(lineNumber); } /** * The number of characters (not counting a possible terminating newline) in a (1-based) * numbered line. */ public final int getLineLength(int lineNumber) { return checkTextMap().lineLength(lineNumber); } private TextMap checkTextMap() { if (textMap == null) { final String code = getCode(); if (code == null) { throw new RuntimeException("can't read file " + getName()); } textMap = new TextMap(code); } return textMap; } } public static class LiteralSourceImpl extends SourceImpl { private final String name; // Name used originally to describe the source private final String code; public LiteralSourceImpl(String name, String code) { this.name = name; this.code = code; } @Override public String getName() { return name; } @Override public String getCode() { return code; } @Override public String getPath() { return name; } @Override public Reader getReader() { return new StringReader(code); } @Override protected void reset() { } @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + name.hashCode(); result = prime * result + (code == null ? 0 : code.hashCode()); return result; } @Override public boolean equals(Object obj) { if (this == obj) { return true; } if (obj == null) { return false; } if (!(obj instanceof LiteralSourceImpl)) { return false; } LiteralSourceImpl other = (LiteralSourceImpl) obj; return name.equals(other.name) && code.equals(other.code); } } private static class FileSourceImpl extends SourceImpl { private final File file; private final String name; // Name used originally to describe the source private final String path; // Normalized path description of an actual file private String code = null; // A cache of the file's contents private long timeStamp; // timestamp of the cache in the file system public FileSourceImpl(File file, String name, String path) { this.file = file; this.name = name; this.path = path; } @Override public String getName() { return name; } @Override public String getCode() { if (code == null || timeStamp != file.lastModified()) { try { code = readCode(getReader()); timeStamp = file.lastModified(); } catch (IOException e) { } } return code; } @Override public String getPath() { return path; } @Override public Reader getReader() { if (code != null && timeStamp == file.lastModified()) { return new StringReader(code); } try { return new FileReader(file); } catch (FileNotFoundException e) { throw new RuntimeException("Can't find file " + path); } } @Override protected void reset() { this.code = null; } } }