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/*
* Copyright (C) 2015 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.
*/
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "Action.h"
#include "LineBuffer.h"
#include "NativeInfo.h"
#include "Pointers.h"
#include "Thread.h"
#include "Threads.h"
static char g_buffer[65535];
size_t GetMaxAllocs(int fd) {
lseek(fd, 0, SEEK_SET);
LineBuffer line_buf(fd, g_buffer, sizeof(g_buffer));
char* line;
size_t line_len;
size_t num_allocs = 0;
while (line_buf.GetLine(&line, &line_len)) {
char* word = reinterpret_cast<char*>(memchr(line, ':', line_len));
if (word == nullptr) {
continue;
}
word++;
while (*word++ == ' ');
// This will treat a realloc as an allocation, even if it frees
// another allocation. Since reallocs are relatively rare, this
// shouldn't inflate the numbers that much.
if (*word == 'f') {
// Check if this is a free of zero.
uintptr_t pointer;
if (sscanf(word, "free %" SCNxPTR, &pointer) == 1 && pointer != 0) {
num_allocs--;
}
} else if (*word != 't') {
// Skip the thread_done message.
num_allocs++;
}
}
return num_allocs;
}
void ProcessDump(int fd, size_t max_allocs, size_t max_threads) {
lseek(fd, 0, SEEK_SET);
Pointers pointers(max_allocs);
Threads threads(&pointers, max_threads);
printf("Maximum threads available: %zu\n", threads.max_threads());
printf("Maximum allocations in dump: %zu\n", max_allocs);
printf("Total pointers available: %zu\n", pointers.max_pointers());
printf("\n");
PrintNativeInfo("Initial ");
LineBuffer line_buf(fd, g_buffer, sizeof(g_buffer));
char* line;
size_t line_len;
size_t line_number = 0;
while (line_buf.GetLine(&line, &line_len)) {
pid_t tid;
int line_pos = 0;
char type[128];
uintptr_t key_pointer;
// Every line is of this format:
// <tid>: <action_type> <pointer>
// Some actions have extra arguments which will be used and verified
// when creating the Action object.
if (sscanf(line, "%d: %s %" SCNxPTR " %n", &tid, type, &key_pointer, &line_pos) != 3) {
err(1, "Unparseable line found: %s\n", line);
}
line_number++;
if ((line_number % 100000) == 0) {
printf(" At line %zu:\n", line_number);
PrintNativeInfo(" ");
}
Thread* thread = threads.FindThread(tid);
if (thread == nullptr) {
thread = threads.CreateThread(tid);
}
// Wait for the thread to complete any previous actions before handling
// the next action.
thread->WaitForReady();
Action* action = thread->CreateAction(key_pointer, type, line + line_pos);
if (action == nullptr) {
err(1, "Cannot create action from line: %s\n", line);
}
bool does_free = action->DoesFree();
if (does_free) {
// Make sure that any other threads doing allocations are complete
// before triggering the action. Otherwise, another thread could
// be creating the allocation we are going to free.
threads.WaitForAllToQuiesce();
}
// Tell the thread to execute the action.
thread->SetPending();
if (action->EndThread()) {
// Wait for the thread to finish and clear the thread entry.
threads.Finish(thread);
}
// Wait for this action to complete. This avoids a race where
// another thread could be creating the same allocation where are
// trying to free.
if (does_free) {
thread->WaitForReady();
}
}
// Wait for all threads to stop processing actions.
threads.WaitForAllToQuiesce();
PrintNativeInfo("Final ");
// Free any outstanding pointers.
// This allows us to run a tool like valgrind to verify that no memory
// is leaked and everything is accounted for during a run.
threads.FinishAll();
pointers.FreeAll();
// Print out the total time making all allocation calls.
printf("Total Allocation/Free Time: %" PRIu64 "ns %0.2fs\n",
threads.total_time_nsecs(), threads.total_time_nsecs()/1000000000.0);
}
constexpr size_t DEFAULT_MAX_THREADS = 512;
int main(int argc, char** argv) {
if (argc != 2 && argc != 3) {
if (argc > 3) {
fprintf(stderr, "Only two arguments are expected.\n");
} else {
fprintf(stderr, "Requires at least one argument.\n");
}
fprintf(stderr, "Usage: %s MEMORY_LOG_FILE [MAX_THREADS]\n", basename(argv[0]));
return 1;
}
size_t max_threads = DEFAULT_MAX_THREADS;
if (argc == 3) {
max_threads = atoi(argv[2]);
}
int dump_fd = open(argv[1], O_RDONLY);
if (dump_fd == -1) {
fprintf(stderr, "Failed to open %s: %s\n", argv[1], strerror(errno));
return 1;
}
printf("Processing: %s\n", argv[1]);
// Do a first pass to get the total number of allocations used at one
// time to allow a single mmap that can hold the maximum number of
// pointers needed at once.
size_t max_allocs = GetMaxAllocs(dump_fd);
ProcessDump(dump_fd, max_allocs, max_threads);
close(dump_fd);
return 0;
}
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