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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 /*
     18  * Preparation and completion of hprof data generation.  The output is
     19  * written into two files and then combined.  This is necessary because
     20  * we generate some of the data (strings and classes) while we dump the
     21  * heap, and some analysis tools require that the class and string data
     22  * appear first.
     23  */
     24 
     25 #include "Hprof.h"
     26 #include "alloc/HeapInternal.h"
     27 #include "alloc/Visit.h"
     28 
     29 #include <string.h>
     30 #include <unistd.h>
     31 #include <fcntl.h>
     32 #include <errno.h>
     33 #include <sys/time.h>
     34 #include <time.h>
     35 
     36 #define kHeadSuffix "-hptemp"
     37 
     38 hprof_context_t* hprofStartup(const char *outputFileName, int fd,
     39                               bool directToDdms)
     40 {
     41     hprofStartup_String();
     42     hprofStartup_Class();
     43 
     44     hprof_context_t *ctx = (hprof_context_t *)calloc(1, sizeof(*ctx));
     45     if (ctx == NULL) {
     46         ALOGE("hprof: can't allocate context.");
     47         return NULL;
     48     }
     49 
     50     /* pass in name or descriptor of the output file */
     51     hprofContextInit(ctx, strdup(outputFileName), fd, false, directToDdms);
     52 
     53     assert(ctx->memFp != NULL);
     54 
     55     return ctx;
     56 }
     57 
     58 /*
     59  * Finish up the hprof dump.  Returns true on success.
     60  */
     61 bool hprofShutdown(hprof_context_t *tailCtx)
     62 {
     63     /* flush the "tail" portion of the output */
     64     hprofFlushCurrentRecord(tailCtx);
     65 
     66     /*
     67      * Create a new context struct for the start of the file.  We
     68      * heap-allocate it so we can share the "free" function.
     69      */
     70     hprof_context_t *headCtx = (hprof_context_t *)calloc(1, sizeof(*headCtx));
     71     if (headCtx == NULL) {
     72         ALOGE("hprof: can't allocate context.");
     73         hprofFreeContext(tailCtx);
     74         return false;
     75     }
     76     hprofContextInit(headCtx, strdup(tailCtx->fileName), tailCtx->fd, true,
     77         tailCtx->directToDdms);
     78 
     79     ALOGI("hprof: dumping heap strings to \"%s\".", tailCtx->fileName);
     80     hprofDumpStrings(headCtx);
     81     hprofDumpClasses(headCtx);
     82 
     83     /* Write a dummy stack trace record so the analysis
     84      * tools don't freak out.
     85      */
     86     hprofStartNewRecord(headCtx, HPROF_TAG_STACK_TRACE, HPROF_TIME);
     87     hprofAddU4ToRecord(&headCtx->curRec, HPROF_NULL_STACK_TRACE);
     88     hprofAddU4ToRecord(&headCtx->curRec, HPROF_NULL_THREAD);
     89     hprofAddU4ToRecord(&headCtx->curRec, 0);    // no frames
     90 
     91     hprofFlushCurrentRecord(headCtx);
     92 
     93     hprofShutdown_Class();
     94     hprofShutdown_String();
     95 
     96     /* flush to ensure memstream pointer and size are updated */
     97     fflush(headCtx->memFp);
     98     fflush(tailCtx->memFp);
     99 
    100     if (tailCtx->directToDdms) {
    101         /* send the data off to DDMS */
    102         struct iovec iov[2];
    103         iov[0].iov_base = headCtx->fileDataPtr;
    104         iov[0].iov_len = headCtx->fileDataSize;
    105         iov[1].iov_base = tailCtx->fileDataPtr;
    106         iov[1].iov_len = tailCtx->fileDataSize;
    107         dvmDbgDdmSendChunkV(CHUNK_TYPE("HPDS"), iov, 2);
    108     } else {
    109         /*
    110          * Open the output file, and copy the head and tail to it.
    111          */
    112         assert(headCtx->fd == tailCtx->fd);
    113 
    114         int outFd;
    115         if (headCtx->fd >= 0) {
    116             outFd = dup(headCtx->fd);
    117             if (outFd < 0) {
    118                 ALOGE("dup(%d) failed: %s", headCtx->fd, strerror(errno));
    119                 /* continue to fail-handler below */
    120             }
    121         } else {
    122             outFd = open(tailCtx->fileName, O_WRONLY|O_CREAT|O_TRUNC, 0644);
    123             if (outFd < 0) {
    124                 ALOGE("can't open %s: %s", headCtx->fileName, strerror(errno));
    125                 /* continue to fail-handler below */
    126             }
    127         }
    128         if (outFd < 0) {
    129             hprofFreeContext(headCtx);
    130             hprofFreeContext(tailCtx);
    131             return false;
    132         }
    133 
    134         int result;
    135         result = sysWriteFully(outFd, headCtx->fileDataPtr,
    136             headCtx->fileDataSize, "hprof-head");
    137         result |= sysWriteFully(outFd, tailCtx->fileDataPtr,
    138             tailCtx->fileDataSize, "hprof-tail");
    139         close(outFd);
    140         if (result != 0) {
    141             hprofFreeContext(headCtx);
    142             hprofFreeContext(tailCtx);
    143             return false;
    144         }
    145     }
    146 
    147     /* throw out a log message for the benefit of "runhat" */
    148     ALOGI("hprof: heap dump completed (%dKB)",
    149         (headCtx->fileDataSize + tailCtx->fileDataSize + 1023) / 1024);
    150 
    151     hprofFreeContext(headCtx);
    152     hprofFreeContext(tailCtx);
    153 
    154     return true;
    155 }
    156 
    157 /*
    158  * Free any heap-allocated items in "ctx", and then free "ctx" itself.
    159  */
    160 void hprofFreeContext(hprof_context_t *ctx)
    161 {
    162     assert(ctx != NULL);
    163 
    164     /* we don't own ctx->fd, do not close */
    165 
    166     if (ctx->memFp != NULL)
    167         fclose(ctx->memFp);
    168     free(ctx->curRec.body);
    169     free(ctx->fileName);
    170     free(ctx->fileDataPtr);
    171     free(ctx);
    172 }
    173 
    174 /*
    175  * Visitor invoked on every root reference.
    176  */
    177 static void hprofRootVisitor(void *addr, u4 threadId, RootType type, void *arg)
    178 {
    179     static const hprof_heap_tag_t xlate[] = {
    180         HPROF_ROOT_UNKNOWN,
    181         HPROF_ROOT_JNI_GLOBAL,
    182         HPROF_ROOT_JNI_LOCAL,
    183         HPROF_ROOT_JAVA_FRAME,
    184         HPROF_ROOT_NATIVE_STACK,
    185         HPROF_ROOT_STICKY_CLASS,
    186         HPROF_ROOT_THREAD_BLOCK,
    187         HPROF_ROOT_MONITOR_USED,
    188         HPROF_ROOT_THREAD_OBJECT,
    189         HPROF_ROOT_INTERNED_STRING,
    190         HPROF_ROOT_FINALIZING,
    191         HPROF_ROOT_DEBUGGER,
    192         HPROF_ROOT_REFERENCE_CLEANUP,
    193         HPROF_ROOT_VM_INTERNAL,
    194         HPROF_ROOT_JNI_MONITOR,
    195     };
    196     hprof_context_t *ctx;
    197     Object *obj;
    198 
    199     assert(addr != NULL);
    200     assert(arg != NULL);
    201     assert(type < NELEM(xlate));
    202     obj = *(Object **)addr;
    203     if (obj == NULL) {
    204         return;
    205     }
    206     ctx = (hprof_context_t *)arg;
    207     ctx->gcScanState = xlate[type];
    208     ctx->gcThreadSerialNumber = threadId;
    209     hprofMarkRootObject(ctx, obj, 0);
    210     ctx->gcScanState = 0;
    211     ctx->gcThreadSerialNumber = 0;
    212 }
    213 
    214 /*
    215  * Visitor invoked on every heap object.
    216  */
    217 static void hprofBitmapCallback(Object *obj, void *arg)
    218 {
    219     assert(obj != NULL);
    220     assert(arg != NULL);
    221     hprof_context_t *ctx = (hprof_context_t *)arg;
    222     hprofDumpHeapObject(ctx, obj);
    223 }
    224 
    225 /*
    226  * Walk the roots and heap writing heap information to the specified
    227  * file.
    228  *
    229  * If "fd" is >= 0, the output will be written to that file descriptor.
    230  * Otherwise, "fileName" is used to create an output file.
    231  *
    232  * If "directToDdms" is set, the other arguments are ignored, and data is
    233  * sent directly to DDMS.
    234  *
    235  * Returns 0 on success, or an error code on failure.
    236  */
    237 int hprofDumpHeap(const char* fileName, int fd, bool directToDdms)
    238 {
    239     hprof_context_t *ctx;
    240     int success;
    241 
    242     assert(fileName != NULL);
    243     dvmLockHeap();
    244     dvmSuspendAllThreads(SUSPEND_FOR_HPROF);
    245     ctx = hprofStartup(fileName, fd, directToDdms);
    246     if (ctx == NULL) {
    247         return -1;
    248     }
    249     dvmVisitRoots(hprofRootVisitor, ctx);
    250     dvmHeapBitmapWalk(dvmHeapSourceGetLiveBits(), hprofBitmapCallback, ctx);
    251     hprofFinishHeapDump(ctx);
    252 //TODO: write a HEAP_SUMMARY record
    253     success = hprofShutdown(ctx) ? 0 : -1;
    254     dvmResumeAllThreads(SUSPEND_FOR_HPROF);
    255     dvmUnlockHeap();
    256     return success;
    257 }
    258