Revert "Implement memory-mapped ExecutionData class."

This reverts commit cb523bf186baa02b7478c81a7a64d2a2ee3d6b5f.

Reason for revert: Fix boot failure

Change-Id: I7480ca95e548ea663b3d16ca62cc5b5ec3d30514

1 files changed, 0 insertions, 324 deletions

diff --git a/org.jacoco.core/src/org/jacoco/core/data/MappedExecutionData.java b/org.jacoco.core/src/org/jacoco/core/data/MappedExecutionData.java
deleted file mode 100644
index 39b90fb6..00000000
--- a/org.jacoco.core/src/org/jacoco/core/data/MappedExecutionData.java
+++ /dev/null
@@ -1,324 +0,0 @@
-// BEGIN android-change
-package org.jacoco.core.data;
-
-import static java.lang.String.format;
-
-import java.io.File;
-import java.io.IOException;
-import java.io.RandomAccessFile;
-import java.nio.channels.FileChannel;
-import java.nio.channels.FileLock;
-import java.nio.charset.Charset;
-import java.nio.ByteBuffer;
-import java.nio.MappedByteBuffer;
-
-import org.jacoco.core.data.ExecutionDataWriter;
-
-/**
- * Memory-mapped execution data implementation.
- *
- * Stores the probe data in a section of a memory-mapped file, so that it will be available without
- * requiring a flush of the coverage data.
- */
-public final class MappedExecutionData implements IExecutionData {
-
-	private static FileChannel CHANNEL;
-
-	private final long id;
-	private final String name;
-	private final int probeCount;
-
-	// Stores the memory-mapped byte buffer containing the probe data, packed as bits.
-	private MappedByteBuffer probeBuffer;
-
-	/**
-	 * Creates the mapped execution data.
-	 */
-	public MappedExecutionData(final long id, final String name, final int probeCount)
-			throws IOException {
-		this.id = id;
-		this.name = name;
-		this.probeCount = probeCount;
-
-		createMemoryMappedProbeArray(id, name, probeCount);
-	}
-
-	/**
-	 * Maps a section of the already-opened file for the probe data.
-	 *
-	 * @param id  the class id
-	 * @param name  the VM class name
-	 * @param probeCount  the number of probes for this class
-	 */
-	private void createMemoryMappedProbeArray(
-		final long id, final String name, final int probeCount) throws IOException {
-		// TODO: Figure out a more portable way to do this. Currently needed to avoid
-		// cross-VM race conditions when writing/mapping the file.  Since most processes
-		// are forked from zygote, they will initially share the same output file, but
-		// without synchronization across VMs, this can cause simultaneous maps/writes from
-		// different VMs to interrupt each other, resulting in malformed execution data.
-		// Adding file locks did not resolve this issue. Note that only new classes that
-		// were loaded after the fork will end up in the new file. Classes that were
-		// already loaded will end up in the original output file for the pre-forked
-		// process, which is OK.
-		if (CHANNEL == null) {
-			throw new IOException("Memory mapped file was not initialized.");
-		}
-
-		synchronized (CHANNEL) {
-			int byteCount = (probeCount + 7) / 8;
-
-			// Write the ExecutionData block info.
-			ByteBuffer execDataBuffer = ByteBuffer.allocate(11);
-			execDataBuffer.put(ExecutionDataWriter.BLOCK_EXECUTIONDATA);
-			execDataBuffer.putLong(id);
-			execDataBuffer.putShort((short) name.length());
-			execDataBuffer.flip();
-			CHANNEL.write(execDataBuffer);
-			CHANNEL.write(ByteBuffer.wrap(name.getBytes(Charset.forName("UTF-8"))));
-
-			// Write the probe info and map part of this file for the probe data.
-			CHANNEL.write(toVarIntByteBuffer(probeCount));
-			probeBuffer = CHANNEL.map(FileChannel.MapMode.READ_WRITE, CHANNEL.position(), byteCount);
-			CHANNEL.position(CHANNEL.position() + byteCount);
-		}
-	}
-
-	/**
-	 * Creates the output file that will be mapped for probe data.
-	 */
-	public static void prepareFile(int pid) throws IOException {
-		// Write header information to the file.
-		ByteBuffer headerBuffer = ByteBuffer.allocate(5);
-		headerBuffer.put(ExecutionDataWriter.BLOCK_HEADER);
-		headerBuffer.putChar(ExecutionDataWriter.MAGIC_NUMBER);
-		headerBuffer.putChar(ExecutionDataWriter.FORMAT_VERSION);
-		headerBuffer.flip();
-
-		// If this file already exists (due to pid re-usage), the previous coverage data
-		// will be lost when the file is overwritten.
-		File outputFile = new File("/data/misc/trace/jacoco-" + pid + ".mm.ec");
-		CHANNEL = new RandomAccessFile(outputFile, "rw").getChannel();
-		synchronized (CHANNEL) {
-			CHANNEL.write(headerBuffer);
-		}
-	}
-
-	/**
-	 * Writes a variable-length int to a {@link ByteBuffer}.
-	 *
-	 * @param value  the value to write
-	 * @return a ByteBuffer that can be used to write to a FileChannel containing the value
-	 */
-	private ByteBuffer toVarIntByteBuffer(int value) {
-		ByteBuffer buffer = ByteBuffer.allocate(5);
-		if (value == 0) {
-			buffer.put((byte) 0);
-		} else {
-			while (value > 0) {
-				if ((value & 0xFFFFFF80) == 0) {
-					buffer.put((byte) value);
-				} else {
-					buffer.put((byte) (0x80 | (value & 0x7F)));
-				}
-				value >>>= 7;
-			}
-		}
-		buffer.flip();
-		return buffer;
-	}
-
-	/**
-	 * Return the unique identifier for this class. The identifier is the CRC64
-	 * checksum of the raw class file definition.
-	 *
-	 * @return class identifier
-	 */
-	public long getId() {
-		return id;
-	}
-
-	/**
-	 * The VM name of the class.
-	 *
-	 * @return VM name
-	 */
-	public String getName() {
-		return name;
-	}
-
-	/**
-	 * The number of instrumentation probes for this class.
-	 *
-	 * @return number of probes
-	 */
-	public int getProbeCount() {
-		return probeCount;
-	}
-
-	/**
-	 * Returns a copy of the probe data as a boolean array.
-	 *
-	 * Changes to the returned array will not be reflected in the execution data.
-	 *
-	 * @return copy of the probe data
-	 */
-	public boolean[] getProbesCopy() {
-		final int bytes = (probeCount + 7) / 8;
-		boolean[] probes = new boolean[probeCount];
-		for (int index = 0; index < probeCount; index += 8) {
-			byte byteProbe = probeBuffer.get(index / 8);
-			for (int bit = 0; (bit < 8) && ((index + bit) < probeCount); bit++) {
-				probes[index + bit] = ((byteProbe & 0x1) > 0);
-				byteProbe >>>= 1;
-			}
-		}
-		return probes;
-	}
-
-	/**
-	 * Sets all probes to <code>false</code>.
-	 */
-	public void reset() {
-		final int bytes = (probeCount + 7) / 8;
-		synchronized (probeBuffer) {
-			for (int i = 0; i < bytes; i++) {
-				probeBuffer.put(i, (byte) 0);
-			}
-		}
-	}
-
-	/**
-	 * Checks whether any probe has been hit.
-	 *
-	 * @return <code>true</code>, if at least one probe has been hit
-	 */
-	public boolean hasHits() {
-		final int bytes = (probeCount + 7) / 8;
-		synchronized (probeBuffer) {
-			for (int i = 0; i < bytes; i++) {
-				if (probeBuffer.get(i) > 0) {
-					return true;
-				}
-			}
-		}
-		return false;
-	}
-
-	/**
-	 * Merges the given execution data into the probe data of this object. I.e.
-	 * a probe entry in this object is marked as executed (<code>true</code>) if
-	 * this probe or the corresponding other probe was executed. So the result
-	 * is
-	 *
-	 * <pre>
-	 * A or B
-	 * </pre>
-	 *
-	 * The probe array of the other object is not modified.
-	 *
-	 * @param other
-	 *            execution data to merge
-	 */
-	public void merge(final IExecutionData other) {
-		merge(other, true);
-	}
-
-	/**
-	 * Merges the given execution data into the probe data of this object. A
-	 * probe in this object is set to the value of <code>flag</code> if the
-	 * corresponding other probe was executed. For <code>flag==true</code> this
-	 * corresponds to
-	 *
-	 * <pre>
-	 * A or B
-	 * </pre>
-	 *
-	 * For <code>flag==false</code> this can be considered as a subtraction
-	 *
-	 * <pre>
-	 * A and not B
-	 * </pre>
-	 *
-	 * The probe array of the other object is not modified.
-	 *
-	 * @param other
-	 *            execution data to merge
-	 * @param flag
-	 *            merge mode
-	 */
-	public void merge(final IExecutionData other, final boolean flag) {
-		synchronized (probeBuffer) {
-			for (int i = 0; i < probeCount; i++) {
-				if (other.getProbe(i)) {
-					setProbe(i);
-				}
-			}
-		}
-	}
-
-	/**
-	 * Asserts that this execution data object is compatible with the given
-	 * parameters. The purpose of this check is to detect a very unlikely class
-	 * id collision.
-	 *
-	 * @param id
-	 *            other class id, must be the same
-	 * @param name
-	 *            other name, must be equal to this name
-	 * @param probecount
-	 *            probe data length, must be the same as for this data
-	 * @throws IllegalStateException
-	 *             if the given parameters do not match this instance
-	 */
-	public void assertCompatibility(final long id, final String name, final int probeCount)
-		throws IllegalStateException {
-		if (this.id != id) {
-			throw new IllegalStateException(format(
-					"Different ids (%016x and %016x).", Long.valueOf(this.id),
-					Long.valueOf(id)));
-		}
-		if (!this.name.equals(name)) {
-			throw new IllegalStateException(format(
-					"Different class names %s and %s for id %016x.", this.name,
-					name, Long.valueOf(id)));
-		}
-		if (this.probeCount != probeCount) {
-			throw new IllegalStateException(format(
-					"Incompatible execution data for class %s with id %016x.",
-					name, Long.valueOf(id)));
-		}
-	}
-
-	/**
-	 * Returns the execution data probe for a given index. A value of
-	 * <code>true</code> indicates that the corresponding probe was
-	 * executed.
-	 *
-	 * @param index  the probe's index to look up
-	 *
-	 * @return probe data
-	 */
-	public boolean getProbe(final int index) {
-		int offset = index / 8;
-		int bit = 1 << (index % 8);
-		return (probeBuffer.get(offset) & bit) != 0;
-	}
-
-	/**
-	 * Sets the execution data probe at the given index to <code>true</code>.
-	 *
-	 * @param index  the probe's index to set
-	 */
-	public void setProbe(final int index) {
-		int offset = index / 8;
-		int bit = 1 << (index % 8);
-		byte currentValue = probeBuffer.get(offset);
-		if ((currentValue & bit) == 0) {
-			synchronized (probeBuffer) {
-				probeBuffer.put(offset, (byte) (probeBuffer.get(offset) | bit));
-			}
-		}
-	}
-}
-// END android-change