Examples with VMRuntime dalvik.system.VMRuntime used on opensource projects

Example 16 with VMRuntime

use of dalvik.system.VMRuntime in project android_frameworks_base by AOSPA.

the class ZygoteInit method preloadResources.

/**
     * Load in commonly used resources, so they can be shared across
     * processes.
     *
     * These tend to be a few Kbytes, but are frequently in the 20-40K
     * range, and occasionally even larger.
     */
private static void preloadResources() {
    final VMRuntime runtime = VMRuntime.getRuntime();
    try {
        mResources = Resources.getSystem();
        mResources.startPreloading();
        if (PRELOAD_RESOURCES) {
            Log.i(TAG, "Preloading resources...");
            long startTime = SystemClock.uptimeMillis();
            TypedArray ar = mResources.obtainTypedArray(com.android.internal.R.array.preloaded_drawables);
            int N = preloadDrawables(ar);
            ar.recycle();
            Log.i(TAG, "...preloaded " + N + " resources in " + (SystemClock.uptimeMillis() - startTime) + "ms.");
            startTime = SystemClock.uptimeMillis();
            ar = mResources.obtainTypedArray(com.android.internal.R.array.preloaded_color_state_lists);
            N = preloadColorStateLists(ar);
            ar.recycle();
            Log.i(TAG, "...preloaded " + N + " resources in " + (SystemClock.uptimeMillis() - startTime) + "ms.");
            if (mResources.getBoolean(com.android.internal.R.bool.config_freeformWindowManagement)) {
                startTime = SystemClock.uptimeMillis();
                ar = mResources.obtainTypedArray(com.android.internal.R.array.preloaded_freeform_multi_window_drawables);
                N = preloadDrawables(ar);
                ar.recycle();
                Log.i(TAG, "...preloaded " + N + " resource in " + (SystemClock.uptimeMillis() - startTime) + "ms.");
            }
        } else {
            Log.i(TAG, "Preload resources disabled, skipped.");
        }
        mResources.finishPreloading();
    } catch (RuntimeException e) {
        Log.w(TAG, "Failure preloading resources", e);
    }
}

Example 17 with VMRuntime

use of dalvik.system.VMRuntime in project robovm by robovm.

the class MemoryBlock method allocate.

public static MemoryBlock allocate(int byteCount) {
    VMRuntime runtime = VMRuntime.getRuntime();
    byte[] array = (byte[]) runtime.newNonMovableArray(byte.class, byteCount);
    long address = runtime.addressOf(array);
    return new NonMovableHeapBlock(array, address, byteCount);
}

Example 18 with VMRuntime

use of dalvik.system.VMRuntime in project robovm by robovm.

the class MemoryTest method testSetIntArray.

public void testSetIntArray() {
    int[] values = { 3, 7, 31, 127, 8191, 131071, 524287, 2147483647 };
    int[] swappedValues = new int[values.length];
    for (int i = 0; i < values.length; ++i) {
        swappedValues[i] = Integer.reverseBytes(values[i]);
    }
    int scale = SizeOf.INT;
    VMRuntime runtime = VMRuntime.getRuntime();
    byte[] array = (byte[]) runtime.newNonMovableArray(byte.class, scale * values.length + 1);
    long base_ptr = runtime.addressOf(array);
    for (long ptr_offset = 0; ptr_offset < 2; ++ptr_offset) {
        // To test aligned and unaligned accesses.
        long ptr = base_ptr + ptr_offset;
        Arrays.fill(array, (byte) 0);
        // Regular copy.
        Memory.pokeIntArray(ptr, values, 0, values.length, false);
        assertIntsEqual(values, ptr, false);
        assertIntsEqual(swappedValues, ptr, true);
        // Swapped copy.
        Memory.pokeIntArray(ptr, values, 0, values.length, true);
        assertIntsEqual(values, ptr, true);
        assertIntsEqual(swappedValues, ptr, false);
        // Swapped copies of slices (to ensure we test non-zero offsets).
        for (int i = 0; i < values.length; ++i) {
            Memory.pokeIntArray(ptr + i * scale, values, i, 1, true);
        }
        assertIntsEqual(values, ptr, true);
        assertIntsEqual(swappedValues, ptr, false);
    }
}

Example 19 with VMRuntime

use of dalvik.system.VMRuntime in project android_frameworks_base by DirtyUnicorns.

the class ZygoteInit method preloadClasses.

/**
     * Performs Zygote process initialization. Loads and initializes
     * commonly used classes.
     *
     * Most classes only cause a few hundred bytes to be allocated, but
     * a few will allocate a dozen Kbytes (in one case, 500+K).
     */
private static void preloadClasses() {
    final VMRuntime runtime = VMRuntime.getRuntime();
    InputStream is;
    try {
        is = new FileInputStream(PRELOADED_CLASSES);
    } catch (FileNotFoundException e) {
        Log.e(TAG, "Couldn't find " + PRELOADED_CLASSES + ".");
        return;
    }
    Log.i(TAG, "Preloading classes...");
    long startTime = SystemClock.uptimeMillis();
    // Drop root perms while running static initializers.
    final int reuid = Os.getuid();
    final int regid = Os.getgid();
    // We need to drop root perms only if we're already root. In the case of "wrapped"
    // processes (see WrapperInit), this function is called from an unprivileged uid
    // and gid.
    boolean droppedPriviliges = false;
    if (reuid == ROOT_UID && regid == ROOT_GID) {
        try {
            Os.setregid(ROOT_GID, UNPRIVILEGED_GID);
            Os.setreuid(ROOT_UID, UNPRIVILEGED_UID);
        } catch (ErrnoException ex) {
            throw new RuntimeException("Failed to drop root", ex);
        }
        droppedPriviliges = true;
    }
    // Alter the target heap utilization.  With explicit GCs this
    // is not likely to have any effect.
    float defaultUtilization = runtime.getTargetHeapUtilization();
    runtime.setTargetHeapUtilization(0.8f);
    try {
        BufferedReader br = new BufferedReader(new InputStreamReader(is), 256);
        int count = 0;
        String line;
        while ((line = br.readLine()) != null) {
            // Skip comments and blank lines.
            line = line.trim();
            if (line.startsWith("#") || line.equals("")) {
                continue;
            }
            Trace.traceBegin(Trace.TRACE_TAG_DALVIK, line);
            try {
                if (false) {
                    Log.v(TAG, "Preloading " + line + "...");
                }
                // Load and explicitly initialize the given class. Use
                // Class.forName(String, boolean, ClassLoader) to avoid repeated stack lookups
                // (to derive the caller's class-loader). Use true to force initialization, and
                // null for the boot classpath class-loader (could as well cache the
                // class-loader of this class in a variable).
                Class.forName(line, true, null);
                count++;
            } catch (ClassNotFoundException e) {
                Log.w(TAG, "Class not found for preloading: " + line);
            } catch (UnsatisfiedLinkError e) {
                Log.w(TAG, "Problem preloading " + line + ": " + e);
            } catch (Throwable t) {
                Log.e(TAG, "Error preloading " + line + ".", t);
                if (t instanceof Error) {
                    throw (Error) t;
                }
                if (t instanceof RuntimeException) {
                    throw (RuntimeException) t;
                }
                throw new RuntimeException(t);
            }
            Trace.traceEnd(Trace.TRACE_TAG_DALVIK);
        }
        Log.i(TAG, "...preloaded " + count + " classes in " + (SystemClock.uptimeMillis() - startTime) + "ms.");
    } catch (IOException e) {
        Log.e(TAG, "Error reading " + PRELOADED_CLASSES + ".", e);
    } finally {
        IoUtils.closeQuietly(is);
        // Restore default.
        runtime.setTargetHeapUtilization(defaultUtilization);
        // Fill in dex caches with classes, fields, and methods brought in by preloading.
        Trace.traceBegin(Trace.TRACE_TAG_DALVIK, "PreloadDexCaches");
        runtime.preloadDexCaches();
        Trace.traceEnd(Trace.TRACE_TAG_DALVIK);
        // Bring back root. We'll need it later if we're in the zygote.
        if (droppedPriviliges) {
            try {
                Os.setreuid(ROOT_UID, ROOT_UID);
                Os.setregid(ROOT_GID, ROOT_GID);
            } catch (ErrnoException ex) {
                throw new RuntimeException("Failed to restore root", ex);
            }
        }
    }
}

Example 20 with VMRuntime

use of dalvik.system.VMRuntime in project android_frameworks_base by DirtyUnicorns.

the class DdmHandleHello method handleHELO.

/*
     * Handle introductory packet. This is called during JNI_CreateJavaVM
     * before frameworks native methods are registered, so be careful not
     * to call any APIs that depend on frameworks native code.
     */
private Chunk handleHELO(Chunk request) {
    if (false)
        return createFailChunk(123, "This is a test");
    /*
         * Process the request.
         */
    ByteBuffer in = wrapChunk(request);
    int serverProtoVers = in.getInt();
    if (false)
        Log.v("ddm-hello", "Server version is " + serverProtoVers);
    /*
         * Create a response.
         */
    String vmName = System.getProperty("java.vm.name", "?");
    String vmVersion = System.getProperty("java.vm.version", "?");
    String vmIdent = vmName + " v" + vmVersion;
    //String appName = android.app.ActivityThread.currentPackageName();
    //if (appName == null)
    //    appName = "unknown";
    String appName = DdmHandleAppName.getAppName();
    VMRuntime vmRuntime = VMRuntime.getRuntime();
    String instructionSetDescription = vmRuntime.is64Bit() ? "64-bit" : "32-bit";
    String vmInstructionSet = vmRuntime.vmInstructionSet();
    if (vmInstructionSet != null && vmInstructionSet.length() > 0) {
        instructionSetDescription += " (" + vmInstructionSet + ")";
    }
    String vmFlags = "CheckJNI=" + (vmRuntime.isCheckJniEnabled() ? "true" : "false");
    boolean isNativeDebuggable = vmRuntime.isNativeDebuggable();
    ByteBuffer out = ByteBuffer.allocate(28 + vmIdent.length() * 2 + appName.length() * 2 + instructionSetDescription.length() * 2 + vmFlags.length() * 2 + 1);
    out.order(ChunkHandler.CHUNK_ORDER);
    out.putInt(DdmServer.CLIENT_PROTOCOL_VERSION);
    out.putInt(android.os.Process.myPid());
    out.putInt(vmIdent.length());
    out.putInt(appName.length());
    putString(out, vmIdent);
    putString(out, appName);
    out.putInt(UserHandle.myUserId());
    out.putInt(instructionSetDescription.length());
    putString(out, instructionSetDescription);
    out.putInt(vmFlags.length());
    putString(out, vmFlags);
    out.put((byte) (isNativeDebuggable ? 1 : 0));
    Chunk reply = new Chunk(CHUNK_HELO, out);
    /*
         * Take the opportunity to inform DDMS if we are waiting for a
         * debugger to attach.
         */
    if (Debug.waitingForDebugger())
        sendWAIT(0);
    return reply;
}