/* * Copyright (C) 2007 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package android.os; import com.android.internal.util.TypedProperties; import android.util.Config; import android.util.Log; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.FileReader; import java.io.IOException; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.io.Reader; import java.lang.reflect.Field; import java.lang.reflect.Modifier; import java.lang.annotation.Target; import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import org.apache.harmony.dalvik.ddmc.Chunk; import org.apache.harmony.dalvik.ddmc.ChunkHandler; import org.apache.harmony.dalvik.ddmc.DdmServer; import dalvik.bytecode.Opcodes; import dalvik.system.VMDebug; /** * Provides various debugging functions for Android applications, including * tracing and allocation counts. *

Logging Trace Files

*

Debug can create log files that give details about an application, such as * a call stack and start/stop times for any running methods. See Traceview: A Graphical Log Viewer for * information about reading trace files. To start logging trace files, call one * of the startMethodTracing() methods. To stop tracing, call * {@link #stopMethodTracing()}. */ public final class Debug { /** * Flags for startMethodTracing(). These can be ORed together. * * TRACE_COUNT_ALLOCS adds the results from startAllocCounting to the * trace key file. */ public static final int TRACE_COUNT_ALLOCS = VMDebug.TRACE_COUNT_ALLOCS; /** * Flags for printLoadedClasses(). Default behavior is to only show * the class name. */ public static final int SHOW_FULL_DETAIL = 1; public static final int SHOW_CLASSLOADER = (1 << 1); public static final int SHOW_INITIALIZED = (1 << 2); // set/cleared by waitForDebugger() private static volatile boolean mWaiting = false; private Debug() {} /* * How long to wait for the debugger to finish sending requests. I've * seen this hit 800msec on the device while waiting for a response * to travel over USB and get processed, so we take that and add * half a second. */ private static final int MIN_DEBUGGER_IDLE = 1300; // msec /* how long to sleep when polling for activity */ private static final int SPIN_DELAY = 200; // msec /** * Default trace file path and file */ private static final String DEFAULT_TRACE_PATH_PREFIX = "/sdcard/"; private static final String DEFAULT_TRACE_BODY = "dmtrace"; private static final String DEFAULT_TRACE_EXTENSION = ".trace"; private static final String DEFAULT_TRACE_FILE_PATH = DEFAULT_TRACE_PATH_PREFIX + DEFAULT_TRACE_BODY + DEFAULT_TRACE_EXTENSION; /** * This class is used to retrieved various statistics about the memory mappings for this * process. The returns info broken down by dalvik, native, and other. All results are in kB. */ public static class MemoryInfo { /** The proportional set size for dalvik. */ public int dalvikPss; /** The private dirty pages used by dalvik. */ public int dalvikPrivateDirty; /** The shared dirty pages used by dalvik. */ public int dalvikSharedDirty; /** The proportional set size for the native heap. */ public int nativePss; /** The private dirty pages used by the native heap. */ public int nativePrivateDirty; /** The shared dirty pages used by the native heap. */ public int nativeSharedDirty; /** The proportional set size for everything else. */ public int otherPss; /** The private dirty pages used by everything else. */ public int otherPrivateDirty; /** The shared dirty pages used by everything else. */ public int otherSharedDirty; } /** * Wait until a debugger attaches. As soon as the debugger attaches, * this returns, so you will need to place a breakpoint after the * waitForDebugger() call if you want to start tracing immediately. */ public static void waitForDebugger() { if (!VMDebug.isDebuggingEnabled()) { //System.out.println("debugging not enabled, not waiting"); return; } if (isDebuggerConnected()) return; // if DDMS is listening, inform them of our plight System.out.println("Sending WAIT chunk"); byte[] data = new byte[] { 0 }; // 0 == "waiting for debugger" Chunk waitChunk = new Chunk(ChunkHandler.type("WAIT"), data, 0, 1); DdmServer.sendChunk(waitChunk); mWaiting = true; while (!isDebuggerConnected()) { try { Thread.sleep(SPIN_DELAY); } catch (InterruptedException ie) {} } mWaiting = false; System.out.println("Debugger has connected"); /* * There is no "ready to go" signal from the debugger, and we're * not allowed to suspend ourselves -- the debugger expects us to * be running happily, and gets confused if we aren't. We need to * allow the debugger a chance to set breakpoints before we start * running again. * * Sit and spin until the debugger has been idle for a short while. */ while (true) { long delta = VMDebug.lastDebuggerActivity(); if (delta < 0) { System.out.println("debugger detached?"); break; } if (delta < MIN_DEBUGGER_IDLE) { System.out.println("waiting for debugger to settle..."); try { Thread.sleep(SPIN_DELAY); } catch (InterruptedException ie) {} } else { System.out.println("debugger has settled (" + delta + ")"); break; } } } /** * Returns "true" if one or more threads is waiting for a debugger * to attach. */ public static boolean waitingForDebugger() { return mWaiting; } /** * Determine if a debugger is currently attached. */ public static boolean isDebuggerConnected() { return VMDebug.isDebuggerConnected(); } /** * Change the JDWP port. * * @deprecated no longer needed or useful */ @Deprecated public static void changeDebugPort(int port) {} /** * This is the pathname to the sysfs file that enables and disables * tracing on the qemu emulator. */ private static final String SYSFS_QEMU_TRACE_STATE = "/sys/qemu_trace/state"; /** * Enable qemu tracing. For this to work requires running everything inside * the qemu emulator; otherwise, this method will have no effect. The trace * file is specified on the command line when the emulator is started. For * example, the following command line
* emulator -trace foo
* will start running the emulator and create a trace file named "foo". This * method simply enables writing the trace records to the trace file. * *

* The main differences between this and {@link #startMethodTracing()} are * that tracing in the qemu emulator traces every cpu instruction of every * process, including kernel code, so we have more complete information, * including all context switches. We can also get more detailed information * such as cache misses. The sequence of calls is determined by * post-processing the instruction trace. The qemu tracing is also done * without modifying the application or perturbing the timing of calls * because no instrumentation is added to the application being traced. *

* *

* One limitation of using this method compared to using * {@link #startMethodTracing()} on the real device is that the emulator * does not model all of the real hardware effects such as memory and * bus contention. The emulator also has a simple cache model and cannot * capture all the complexities of a real cache. *

*/ public static void startNativeTracing() { // Open the sysfs file for writing and write "1" to it. PrintWriter outStream = null; try { FileOutputStream fos = new FileOutputStream(SYSFS_QEMU_TRACE_STATE); outStream = new PrintWriter(new OutputStreamWriter(fos)); outStream.println("1"); } catch (Exception e) { } finally { if (outStream != null) outStream.close(); } VMDebug.startEmulatorTracing(); } /** * Stop qemu tracing. See {@link #startNativeTracing()} to start tracing. * *

Tracing can be started and stopped as many times as desired. When * the qemu emulator itself is stopped then the buffered trace records * are flushed and written to the trace file. In fact, it is not necessary * to call this method at all; simply killing qemu is sufficient. But * starting and stopping a trace is useful for examining a specific * region of code.

*/ public static void stopNativeTracing() { VMDebug.stopEmulatorTracing(); // Open the sysfs file for writing and write "0" to it. PrintWriter outStream = null; try { FileOutputStream fos = new FileOutputStream(SYSFS_QEMU_TRACE_STATE); outStream = new PrintWriter(new OutputStreamWriter(fos)); outStream.println("0"); } catch (Exception e) { // We could print an error message here but we probably want // to quietly ignore errors if we are not running in the emulator. } finally { if (outStream != null) outStream.close(); } } /** * Enable "emulator traces", in which information about the current * method is made available to the "emulator -trace" feature. There * is no corresponding "disable" call -- this is intended for use by * the framework when tracing should be turned on and left that way, so * that traces captured with F9/F10 will include the necessary data. * * This puts the VM into "profile" mode, which has performance * consequences. * * To temporarily enable tracing, use {@link #startNativeTracing()}. */ public static void enableEmulatorTraceOutput() { VMDebug.startEmulatorTracing(); } /** * Start method tracing with default log name and buffer size. See Traceview: A Graphical Log Viewer for * information about reading these files. Call stopMethodTracing() to stop * tracing. */ public static void startMethodTracing() { VMDebug.startMethodTracing(DEFAULT_TRACE_FILE_PATH, 0, 0); } /** * Start method tracing, specifying the trace log file name. The trace * file will be put under "/sdcard" unless an absolute path is given. * See Traceview: A Graphical Log Viewer for * information about reading trace files. * * @param traceName Name for the trace log file to create. * If no name argument is given, this value defaults to "/sdcard/dmtrace.trace". * If the files already exist, they will be truncated. * If the trace file given does not end in ".trace", it will be appended for you. */ public static void startMethodTracing(String traceName) { startMethodTracing(traceName, 0, 0); } /** * Start method tracing, specifying the trace log file name and the * buffer size. The trace files will be put under "/sdcard" unless an * absolute path is given. See Traceview: A Graphical Log Viewer for * information about reading trace files. * @param traceName Name for the trace log file to create. * If no name argument is given, this value defaults to "/sdcard/dmtrace.trace". * If the files already exist, they will be truncated. * If the trace file given does not end in ".trace", it will be appended for you. * * @param bufferSize The maximum amount of trace data we gather. If not given, it defaults to 8MB. */ public static void startMethodTracing(String traceName, int bufferSize) { startMethodTracing(traceName, bufferSize, 0); } /** * Start method tracing, specifying the trace log file name and the * buffer size. The trace files will be put under "/sdcard" unless an * absolute path is given. See Traceview: A Graphical Log Viewer for * information about reading trace files. * *

* When method tracing is enabled, the VM will run more slowly than * usual, so the timings from the trace files should only be considered * in relative terms (e.g. was run #1 faster than run #2). The times * for native methods will not change, so don't try to use this to * compare the performance of interpreted and native implementations of the * same method. As an alternative, consider using "native" tracing * in the emulator via {@link #startNativeTracing()}. *

* * @param traceName Name for the trace log file to create. * If no name argument is given, this value defaults to "/sdcard/dmtrace.trace". * If the files already exist, they will be truncated. * If the trace file given does not end in ".trace", it will be appended for you. * @param bufferSize The maximum amount of trace data we gather. If not given, it defaults to 8MB. */ public static void startMethodTracing(String traceName, int bufferSize, int flags) { String pathName = traceName; if (pathName.charAt(0) != '/') pathName = DEFAULT_TRACE_PATH_PREFIX + pathName; if (!pathName.endsWith(DEFAULT_TRACE_EXTENSION)) pathName = pathName + DEFAULT_TRACE_EXTENSION; VMDebug.startMethodTracing(pathName, bufferSize, flags); } /** * Determine whether method tracing is currently active. * @hide */ public static boolean isMethodTracingActive() { return VMDebug.isMethodTracingActive(); } /** * Stop method tracing. */ public static void stopMethodTracing() { VMDebug.stopMethodTracing(); } /** * Get an indication of thread CPU usage. The value returned * indicates the amount of time that the current thread has spent * executing code or waiting for certain types of I/O. * * The time is expressed in nanoseconds, and is only meaningful * when compared to the result from an earlier call. Note that * nanosecond resolution does not imply nanosecond accuracy. * * On system which don't support this operation, the call returns -1. */ public static long threadCpuTimeNanos() { return VMDebug.threadCpuTimeNanos(); } /** * Count the number and aggregate size of memory allocations between * two points. * * The "start" function resets the counts and enables counting. The * "stop" function disables the counting so that the analysis code * doesn't cause additional allocations. The "get" function returns * the specified value. * * Counts are kept for the system as a whole and for each thread. * The per-thread counts for threads other than the current thread * are not cleared by the "reset" or "start" calls. */ public static void startAllocCounting() { VMDebug.startAllocCounting(); } public static void stopAllocCounting() { VMDebug.stopAllocCounting(); } public static int getGlobalAllocCount() { return VMDebug.getAllocCount(VMDebug.KIND_GLOBAL_ALLOCATED_OBJECTS); } public static int getGlobalAllocSize() { return VMDebug.getAllocCount(VMDebug.KIND_GLOBAL_ALLOCATED_BYTES); } public static int getGlobalFreedCount() { return VMDebug.getAllocCount(VMDebug.KIND_GLOBAL_FREED_OBJECTS); } public static int getGlobalFreedSize() { return VMDebug.getAllocCount(VMDebug.KIND_GLOBAL_FREED_BYTES); } public static int getGlobalExternalAllocCount() { return VMDebug.getAllocCount(VMDebug.KIND_GLOBAL_EXT_ALLOCATED_OBJECTS); } public static int getGlobalExternalAllocSize() { return VMDebug.getAllocCount(VMDebug.KIND_GLOBAL_EXT_ALLOCATED_BYTES); } public static int getGlobalExternalFreedCount() { return VMDebug.getAllocCount(VMDebug.KIND_GLOBAL_EXT_FREED_OBJECTS); } public static int getGlobalExternalFreedSize() { return VMDebug.getAllocCount(VMDebug.KIND_GLOBAL_EXT_FREED_BYTES); } public static int getGlobalGcInvocationCount() { return VMDebug.getAllocCount(VMDebug.KIND_GLOBAL_GC_INVOCATIONS); } public static int getThreadAllocCount() { return VMDebug.getAllocCount(VMDebug.KIND_THREAD_ALLOCATED_OBJECTS); } public static int getThreadAllocSize() { return VMDebug.getAllocCount(VMDebug.KIND_THREAD_ALLOCATED_BYTES); } public static int getThreadExternalAllocCount() { return VMDebug.getAllocCount(VMDebug.KIND_THREAD_EXT_ALLOCATED_OBJECTS); } public static int getThreadExternalAllocSize() { return VMDebug.getAllocCount(VMDebug.KIND_THREAD_EXT_ALLOCATED_BYTES); } public static int getThreadGcInvocationCount() { return VMDebug.getAllocCount(VMDebug.KIND_THREAD_GC_INVOCATIONS); } public static void resetGlobalAllocCount() { VMDebug.resetAllocCount(VMDebug.KIND_GLOBAL_ALLOCATED_OBJECTS); } public static void resetGlobalAllocSize() { VMDebug.resetAllocCount(VMDebug.KIND_GLOBAL_ALLOCATED_BYTES); } public static void resetGlobalFreedCount() { VMDebug.resetAllocCount(VMDebug.KIND_GLOBAL_FREED_OBJECTS); } public static void resetGlobalFreedSize() { VMDebug.resetAllocCount(VMDebug.KIND_GLOBAL_FREED_BYTES); } public static void resetGlobalExternalAllocCount() { VMDebug.resetAllocCount(VMDebug.KIND_GLOBAL_EXT_ALLOCATED_OBJECTS); } public static void resetGlobalExternalAllocSize() { VMDebug.resetAllocCount(VMDebug.KIND_GLOBAL_EXT_ALLOCATED_BYTES); } public static void resetGlobalExternalFreedCount() { VMDebug.resetAllocCount(VMDebug.KIND_GLOBAL_EXT_FREED_OBJECTS); } public static void resetGlobalExternalFreedSize() { VMDebug.resetAllocCount(VMDebug.KIND_GLOBAL_EXT_FREED_BYTES); } public static void resetGlobalGcInvocationCount() { VMDebug.resetAllocCount(VMDebug.KIND_GLOBAL_GC_INVOCATIONS); } public static void resetThreadAllocCount() { VMDebug.resetAllocCount(VMDebug.KIND_THREAD_ALLOCATED_OBJECTS); } public static void resetThreadAllocSize() { VMDebug.resetAllocCount(VMDebug.KIND_THREAD_ALLOCATED_BYTES); } public static void resetThreadExternalAllocCount() { VMDebug.resetAllocCount(VMDebug.KIND_THREAD_EXT_ALLOCATED_OBJECTS); } public static void resetThreadExternalAllocSize() { VMDebug.resetAllocCount(VMDebug.KIND_THREAD_EXT_ALLOCATED_BYTES); } public static void resetThreadGcInvocationCount() { VMDebug.resetAllocCount(VMDebug.KIND_THREAD_GC_INVOCATIONS); } public static void resetAllCounts() { VMDebug.resetAllocCount(VMDebug.KIND_ALL_COUNTS); } /** * Returns the size of the native heap. * @return The size of the native heap in bytes. */ public static native long getNativeHeapSize(); /** * Returns the amount of allocated memory in the native heap. * @return The allocated size in bytes. */ public static native long getNativeHeapAllocatedSize(); /** * Returns the amount of free memory in the native heap. * @return The freed size in bytes. */ public static native long getNativeHeapFreeSize(); /** * Retrieves information about this processes memory usages. This information is broken down by * how much is in use by dalivk, the native heap, and everything else. */ public static native void getMemoryInfo(MemoryInfo memoryInfo); /** * Establish an object allocation limit in the current thread. Useful * for catching regressions in code that is expected to operate * without causing any allocations. * * Pass in the maximum number of allowed allocations. Use -1 to disable * the limit. Returns the previous limit. * * The preferred way to use this is: * * int prevLimit = -1; * try { * prevLimit = Debug.setAllocationLimit(0); * ... do stuff that's not expected to allocate memory ... * } finally { * Debug.setAllocationLimit(prevLimit); * } * * This allows limits to be nested. The try/finally ensures that the * limit is reset if something fails. * * Exceeding the limit causes a dalvik.system.AllocationLimitError to * be thrown from a memory allocation call. The limit is reset to -1 * when this happens. * * The feature may be disabled in the VM configuration. If so, this * call has no effect, and always returns -1. */ public static int setAllocationLimit(int limit) { return VMDebug.setAllocationLimit(limit); } /** * Establish a global object allocation limit. This is similar to * {@link #setAllocationLimit(int)} but applies to all threads in * the VM. It will coexist peacefully with per-thread limits. * * [ The value of "limit" is currently restricted to 0 (no allocations * allowed) or -1 (no global limit). This may be changed in a future * release. ] */ public static int setGlobalAllocationLimit(int limit) { if (limit != 0 && limit != -1) throw new IllegalArgumentException("limit must be 0 or -1"); return VMDebug.setGlobalAllocationLimit(limit); } /** * Dump a list of all currently loaded class to the log file. * * @param flags See constants above. */ public static void printLoadedClasses(int flags) { VMDebug.printLoadedClasses(flags); } /** * Get the number of loaded classes. * @return the number of loaded classes. */ public static int getLoadedClassCount() { return VMDebug.getLoadedClassCount(); } /** * Dump "hprof" data to the specified file. This will cause a GC. * * @param fileName Full pathname of output file (e.g. "/sdcard/dump.hprof"). * @throws UnsupportedOperationException if the VM was built without * HPROF support. * @throws IOException if an error occurs while opening or writing files. */ public static void dumpHprofData(String fileName) throws IOException { VMDebug.dumpHprofData(fileName); } /** * Returns the number of sent transactions from this process. * @return The number of sent transactions or -1 if it could not read t. */ public static native int getBinderSentTransactions(); /** * Returns the number of received transactions from the binder driver. * @return The number of received transactions or -1 if it could not read the stats. */ public static native int getBinderReceivedTransactions(); /** * Returns the number of active local Binder objects that exist in the * current process. */ public static final native int getBinderLocalObjectCount(); /** * Returns the number of references to remote proxy Binder objects that * exist in the current process. */ public static final native int getBinderProxyObjectCount(); /** * Returns the number of death notification links to Binder objects that * exist in the current process. */ public static final native int getBinderDeathObjectCount(); /** * API for gathering and querying instruction counts. * * Example usage: * Debug.InstructionCount icount = new Debug.InstructionCount(); * icount.resetAndStart(); * [... do lots of stuff ...] * if (icount.collect()) { * System.out.println("Total instructions executed: " * + icount.globalTotal()); * System.out.println("Method invocations: " * + icount.globalMethodInvocations()); * } */ public static class InstructionCount { private static final int NUM_INSTR = 256; private int[] mCounts; public InstructionCount() { mCounts = new int[NUM_INSTR]; } /** * Reset counters and ensure counts are running. Counts may * have already been running. * * @return true if counting was started */ public boolean resetAndStart() { try { VMDebug.startInstructionCounting(); VMDebug.resetInstructionCount(); } catch (UnsupportedOperationException uoe) { return false; } return true; } /** * Collect instruction counts. May or may not stop the * counting process. */ public boolean collect() { try { VMDebug.stopInstructionCounting(); VMDebug.getInstructionCount(mCounts); } catch (UnsupportedOperationException uoe) { return false; } return true; } /** * Return the total number of instructions executed globally (i.e. in * all threads). */ public int globalTotal() { int count = 0; for (int i = 0; i < NUM_INSTR; i++) count += mCounts[i]; return count; } /** * Return the total number of method-invocation instructions * executed globally. */ public int globalMethodInvocations() { int count = 0; //count += mCounts[Opcodes.OP_EXECUTE_INLINE]; count += mCounts[Opcodes.OP_INVOKE_VIRTUAL]; count += mCounts[Opcodes.OP_INVOKE_SUPER]; count += mCounts[Opcodes.OP_INVOKE_DIRECT]; count += mCounts[Opcodes.OP_INVOKE_STATIC]; count += mCounts[Opcodes.OP_INVOKE_INTERFACE]; count += mCounts[Opcodes.OP_INVOKE_VIRTUAL_RANGE]; count += mCounts[Opcodes.OP_INVOKE_SUPER_RANGE]; count += mCounts[Opcodes.OP_INVOKE_DIRECT_RANGE]; count += mCounts[Opcodes.OP_INVOKE_STATIC_RANGE]; count += mCounts[Opcodes.OP_INVOKE_INTERFACE_RANGE]; //count += mCounts[Opcodes.OP_INVOKE_DIRECT_EMPTY]; count += mCounts[Opcodes.OP_INVOKE_VIRTUAL_QUICK]; count += mCounts[Opcodes.OP_INVOKE_VIRTUAL_QUICK_RANGE]; count += mCounts[Opcodes.OP_INVOKE_SUPER_QUICK]; count += mCounts[Opcodes.OP_INVOKE_SUPER_QUICK_RANGE]; return count; } } /** * A Map of typed debug properties. */ private static final TypedProperties debugProperties; /* * Load the debug properties from the standard files into debugProperties. */ static { if (Config.DEBUG) { final String TAG = "DebugProperties"; final String[] files = { "/system/debug.prop", "/debug.prop", "/data/debug.prop" }; final TypedProperties tp = new TypedProperties(); // Read the properties from each of the files, if present. for (String file : files) { Reader r; try { r = new FileReader(file); } catch (FileNotFoundException ex) { // It's ok if a file is missing. continue; } try { tp.load(r); } catch (Exception ex) { throw new RuntimeException("Problem loading " + file, ex); } finally { try { r.close(); } catch (IOException ex) { // Ignore this error. } } } debugProperties = tp.isEmpty() ? null : tp; } else { debugProperties = null; } } /** * Returns true if the type of the field matches the specified class. * Handles the case where the class is, e.g., java.lang.Boolean, but * the field is of the primitive "boolean" type. Also handles all of * the java.lang.Number subclasses. */ private static boolean fieldTypeMatches(Field field, Class cl) { Class fieldClass = field.getType(); if (fieldClass == cl) { return true; } Field primitiveTypeField; try { /* All of the classes we care about (Boolean, Integer, etc.) * have a Class field called "TYPE" that points to the corresponding * primitive class. */ primitiveTypeField = cl.getField("TYPE"); } catch (NoSuchFieldException ex) { return false; } try { return fieldClass == (Class) primitiveTypeField.get(null); } catch (IllegalAccessException ex) { return false; } } /** * Looks up the property that corresponds to the field, and sets the field's value * if the types match. */ private static void modifyFieldIfSet(final Field field, final TypedProperties properties, final String propertyName) { if (field.getType() == java.lang.String.class) { int stringInfo = properties.getStringInfo(propertyName); switch (stringInfo) { case TypedProperties.STRING_SET: // Handle as usual below. break; case TypedProperties.STRING_NULL: try { field.set(null, null); // null object for static fields; null string } catch (IllegalAccessException ex) { throw new IllegalArgumentException( "Cannot set field for " + propertyName, ex); } return; case TypedProperties.STRING_NOT_SET: return; case TypedProperties.STRING_TYPE_MISMATCH: throw new IllegalArgumentException( "Type of " + propertyName + " " + " does not match field type (" + field.getType() + ")"); default: throw new IllegalStateException( "Unexpected getStringInfo(" + propertyName + ") return value " + stringInfo); } } Object value = properties.get(propertyName); if (value != null) { if (!fieldTypeMatches(field, value.getClass())) { throw new IllegalArgumentException( "Type of " + propertyName + " (" + value.getClass() + ") " + " does not match field type (" + field.getType() + ")"); } try { field.set(null, value); // null object for static fields } catch (IllegalAccessException ex) { throw new IllegalArgumentException( "Cannot set field for " + propertyName, ex); } } } /** * Equivalent to setFieldsOn(cl, false). * * @see #setFieldsOn(Class, boolean) * * @hide */ public static void setFieldsOn(Class cl) { setFieldsOn(cl, false); } /** * Reflectively sets static fields of a class based on internal debugging * properties. This method is a no-op if android.util.Config.DEBUG is * false. *

* NOTE TO APPLICATION DEVELOPERS: Config.DEBUG will * always be false in release builds. This API is typically only useful * for platform developers. *

* Class setup: define a class whose only fields are non-final, static * primitive types (except for "char") or Strings. In a static block * after the field definitions/initializations, pass the class to * this method, Debug.setFieldsOn(). Example: *
     * package com.example;
     *
     * import android.os.Debug;
     *
     * public class MyDebugVars {
     *    public static String s = "a string";
     *    public static String s2 = "second string";
     *    public static String ns = null;
     *    public static boolean b = false;
     *    public static int i = 5;
     *    @Debug.DebugProperty
     *    public static float f = 0.1f;
     *    @@Debug.DebugProperty
     *    public static double d = 0.5d;
     *
     *    // This MUST appear AFTER all fields are defined and initialized!
     *    static {
     *        // Sets all the fields
     *        Debug.setFieldsOn(MyDebugVars.class);
     * 
     *        // Sets only the fields annotated with @Debug.DebugProperty
     *        // Debug.setFieldsOn(MyDebugVars.class, true);
     *    }
     * }
     * 
* setFieldsOn() may override the value of any field in the class based * on internal properties that are fixed at boot time. *

* These properties are only set during platform debugging, and are not * meant to be used as a general-purpose properties store. * * {@hide} * * @param cl The class to (possibly) modify * @param partial If false, sets all static fields, otherwise, only set * fields with the {@link android.os.Debug.DebugProperty} * annotation * @throws IllegalArgumentException if any fields are final or non-static, * or if the type of the field does not match the type of * the internal debugging property value. */ public static void setFieldsOn(Class cl, boolean partial) { if (Config.DEBUG) { if (debugProperties != null) { /* Only look for fields declared directly by the class, * so we don't mysteriously change static fields in superclasses. */ for (Field field : cl.getDeclaredFields()) { if (!partial || field.getAnnotation(DebugProperty.class) != null) { final String propertyName = cl.getName() + "." + field.getName(); boolean isStatic = Modifier.isStatic(field.getModifiers()); boolean isFinal = Modifier.isFinal(field.getModifiers()); if (!isStatic || isFinal) { throw new IllegalArgumentException(propertyName + " must be static and non-final"); } modifyFieldIfSet(field, debugProperties, propertyName); } } } } else { Log.w("android.os.Debug", "setFieldsOn(" + (cl == null ? "null" : cl.getName()) + ") called in non-DEBUG build"); } } /** * Annotation to put on fields you want to set with * {@link Debug#setFieldsOn(Class, boolean)}. * * @hide */ @Target({ ElementType.FIELD }) @Retention(RetentionPolicy.RUNTIME) public @interface DebugProperty { } }