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mdriver.c
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mdriver.c
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/*
* Mdriver.c - Autolab version of the CS:APP Malloc Lab Driver
*
* Uses a collection of trace files to tests a malloc/free
* implementation in mm.c.
*
* Copyright (c) 2004-2016, R. Bryant and D. O'Hallaron, All rights
* reserved. May not be used, modified, or copied without permission.
*/
#include <assert.h>
#include <errno.h>
#include <float.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <stdbool.h>
#include <math.h>
#include "mm.h"
#include "memlib.h"
#include "fcyc.h"
#include "config.h"
#include "stree.h"
/**********************
* Constants and macros
**********************/
/* Misc */
#define MAXLINE 1024 /* max string size */
#define HDRLINES 4 /* number of header lines in a trace file */
#define LINENUM(i) (i+HDRLINES+1) /* cnvt trace request nums to linenums (origin 1) */
#ifndef REF_ONLY
#define REF_ONLY 0
#endif
/* Returns true if p is ALIGNMENT-byte aligned */
#define IS_ALIGNED(p) ((((unsigned long)(p)) % ALIGNMENT) == 0)
/* weights */
typedef enum { WNONE, WALL, WUTIL, WPERF } weight_t;
/******************************
* The key compound data types
*****************************/
/*
* There are two different, easily-confusable concepts:
* - opnum: which line in the file.
* - index: the block number ; corresponds to something allocated.
* Remember that index (-1) is the null pointer.
*/
/*
* Records the extent of each block's payload.
* Organized as doubly linked list
*/
typedef struct range_t {
char *lo; /* low payload address */
char *hi; /* high payload address */
long index; /* same index as free; for debugging */
struct range_t *next;
struct range_t *prev;
} range_t;
/*
* All information about set of ranges represented as doubly-linked
* list of ranges, plus a splay tree keyed by lo addresses
*/
typedef struct {
range_t *list;
tree_t *lo_tree;
} range_set_t;
/* Characterizes a single trace operation (allocator request) */
typedef struct {
enum { ALLOC, FREE, REALLOC } type; /* type of request */
long index; /* index for free() to use later */
size_t size; /* byte size of alloc/realloc request */
} traceop_t;
/* Holds the information for one trace file */
typedef struct {
char filename[MAXLINE];
size_t data_bytes; /* Peak number of data bytes allocated during trace */
int num_ids; /* number of alloc/realloc ids */
int num_ops; /* number of distinct requests */
weight_t weight; /* weight for this trace */
traceop_t *ops; /* array of requests */
char **blocks; /* array of ptrs returned by malloc/realloc... */
size_t *block_sizes; /* ... and a corresponding array of payload sizes */
int *block_rand_base; /* index into random_data, if debug is on */
} trace_t;
/*
* Holds the params to the xxx_speed functions, which are timed by fcyc.
* This struct is necessary because fcyc accepts only a pointer array
* as input.
*/
typedef struct {
trace_t *trace;
range_set_t *ranges;
} speed_t;
/* Summarizes the important stats for some malloc function on some trace */
typedef struct {
/* set in read_trace */
char filename[MAXLINE];
weight_t weight;
double ops; /* number of ops (malloc/free/realloc) in the trace */
/* run-time stats defined for both libc and student */
bool valid; /* was the trace processed correctly by the allocator? */
double secs; /* number of secs needed to run the trace */
/* defined only for the student malloc package */
double util; /* space utilization for this trace (always 0 for libc) */
/* Note: secs and util are only defined if valid is true */
} stats_t;
/* Summarizes the key statistics for a set of traces */
typedef struct {
double util; /* average utilization expressed as a percentage */
double ops; /* total number of operations */
double secs; /* total number of elapsed seconds */
double tput; /* average throughput expressed in Kops/s */
} sum_stats_t;
/********************
* For debugging. If debug-mode is on, then we have each block start
* at a "random" place (a hash of the index), and copy random data
* into it. With DBG_CHEAP, we check that the data survived when we
* realloc and when we free. With DBG_EXPENSIVE, we check every block
* every operation.
* randint_t should be a byte, in case students return unaligned memory.
*******************/
#define RANDOM_DATA_LEN (1<<16)
typedef unsigned char randint_t;
static const char randint_t_name[] = "byte";
static randint_t random_data[RANDOM_DATA_LEN];
/********************
* Global variables
*******************/
/* Global values */
typedef enum { DBG_NONE, DBG_CHEAP, DBG_EXPENSIVE } debug_mode_t;
static debug_mode_t debug_mode = REF_ONLY ? DBG_NONE : DBG_CHEAP;
int verbose = REF_ONLY ? 0 : 1; /* global flag for verbose output */
static int errors = 0; /* number of errs found when running student malloc */
static bool onetime_flag = false;
static bool tab_mode = false; /* Print output as tab-separated fields */
static size_t maxfill = MAXFILL;
/* by default, no timeouts */
static int set_timeout = 0;
/* Directory where default tracefiles are found */
static char tracedir[MAXLINE] = TRACEDIR;
/* The following are null-terminated lists of tracefiles that may or may not get used */
/* The filenames of the default tracefiles */
static char *default_tracefiles[] = {
DEFAULT_TRACEFILES, NULL
};
/* Store names of trace files as array of char *'s */
static int num_global_tracefiles = 0;
static char **global_tracefiles = NULL;
/* Summary statistics for libc and student's mm.c submissions */
static sum_stats_t global_libc_sum_stats;
static sum_stats_t global_mm_sum_stats;
/* Performance statistics for driver */
/*********************
* Function prototypes
*********************/
/* This function enables generating the set of trace files */
static void add_tracefile(char *trace);
/* these functions manipulate range sets */
static range_set_t *new_range_set();
static bool add_range(range_set_t *ranges, char *lo, size_t size,
const trace_t *trace, int opnum, int index);
static void remove_range(range_set_t *ranges, char *lo);
static void free_range_set(range_set_t *ranges);
/* These functions implement the debugging code */
static void init_random_data(void);
static bool check_index(const trace_t *trace, int opnum, int index, int realloc);
static void randomize_block(trace_t *trace, int index);
/* These functions read, allocate, and free storage for traces */
static trace_t *read_trace(stats_t *stats, const char *tracedir,
const char *filename);
static void reinit_trace(trace_t *trace);
static void free_trace(trace_t *trace);
/* Routines for evaluating the correctness and speed of libc malloc */
static bool eval_libc_valid(trace_t *trace);
static void eval_libc_speed(void *ptr);
/* Routines for evaluating correctnes, space utilization, and speed
of the student's malloc package in mm.c */
static bool eval_mm_valid(trace_t *trace, range_set_t *ranges);
static double eval_mm_util(trace_t *trace, int tracenum);
static void eval_mm_speed(void *ptr);
/* Various helper routines */
static void printresults(int n, stats_t *stats, sum_stats_t *sumstats);
static void usage(char *prog);
static void malloc_error(const trace_t *trace, int opnum, const char *fmt, ...)
__attribute__((format(printf, 3,4)));
static void unix_error(const char *fmt, ...)
__attribute__((format(printf, 1,2), noreturn));
static void app_error(const char *fmt, ...)
__attribute__((format(printf, 1,2), noreturn));
static sigjmp_buf timeout_jmpbuf;
/* Timeout signal handler */
static void timeout_handler(int sig __attribute__((unused))) {
fprintf(stderr, "The driver timed out after %d secs\n", set_timeout);
errors = 1;
longjmp(timeout_jmpbuf, 1);
}
/* Compute throughput from reference implementation */
static double measure_ref_throughput();
/*
* Run the tests; return the number of tests run (may be less than
* num_tracefiles, if there's a timeout)
*/
static void run_tests(int num_tracefiles, const char *tracedir,
char **tracefiles,
stats_t *mm_stats, speed_t *speed_params) {
volatile int i;
for (i=0; i < num_tracefiles; i++) {
/* initialize simulated memory system in memlib.c *
* start each trace with a clean system */
mem_init();
range_set_t *ranges = new_range_set();
// NOTE: If times out, then it will reread the trace file
trace_t *trace;
trace = read_trace(&mm_stats[i], tracedir, tracefiles[i]);
strcpy(mm_stats[i].filename, trace->filename);
mm_stats[i].ops = trace->num_ops;
/* Prepare for timeout */
if (setjmp(timeout_jmpbuf) != 0) {
mm_stats[i].valid = false;
} else {
if (verbose > 1)
printf("Checking mm_malloc for correctness, ");
mm_stats[i].valid =
/* Do 2 tests, since may fail to reinitialize properly */
eval_mm_valid(trace, ranges) && eval_mm_valid(trace, ranges);
if (onetime_flag) {
free_trace(trace);
return;
}
}
if (mm_stats[i].valid) {
if (verbose > 1)
printf("efficiency, ");
mm_stats[i].util = eval_mm_util(trace, i);
speed_params->trace = trace;
speed_params->ranges = ranges;
if (verbose > 1)
printf("and performance.\n");
mm_stats[i].secs = fsec(eval_mm_speed, speed_params);
}
#if 0
printf(" %d operations. %ld comparisons. Avg = %.1f\n",
trace->num_ops, ranges->lo_tree->comparison_count,
(double) ranges->lo_tree->comparison_count / trace->num_ops);
#endif
free_trace(trace);
free_range_set(ranges);
/* clean up memory system */
mem_deinit();
}
}
double score_component(double perf, double min_perf, double max_perf)
{
if (perf < min_perf) {
return 0.0;
} else if (perf > max_perf) {
return 1.0;
} else {
return (perf - min_perf) / (max_perf - min_perf);
}
}
/**************
* Main routine
**************/
int main(int argc, char **argv)
{
int i;
global_tracefiles = NULL; /* array of trace file names */
num_global_tracefiles = 0; /* the number of traces in that array */
stats_t *libc_stats = NULL;/* libc stats for each trace */
stats_t *mm_stats = NULL; /* mm (i.e. student) stats for each trace */
speed_t speed_params; /* input parameters to the xx_speed routines */
bool run_libc = false; /* If set, run libc malloc (set by -l) */
/* temporaries used to compute the performance index */
double secs, ops, util;
double avg_mm_util, avg_mm_throughput = 0;
// double p1_checkpoint;
double p1, p2, perfindex;
double correctindex;
double util_weight = 0, perf_weight = 0;
int numcorrect;
setbuf(stdout, 0);
setbuf(stderr, 0);
double min_throughput_checkpoint = 5000;
double max_throughput_checkpoint = 10000;;
double min_throughput = 5000;
double max_throughput = 10000;;
#if !REF_ONLY
double ref_throughput;
char c;
/*
* Read and interpret the command line arguments
*/
while ((c = getopt(argc, argv, "d:f:c:s:t:v:hOVlDT")) != EOF) {
switch (c) {
case 'f': /* Use one specific trace file only (relative to curr dir) */
add_tracefile(optarg);
strcpy(tracedir, "./");
break;
case 'c': /* Use one specific trace file and run only once */
add_tracefile(optarg);
onetime_flag = true;
strcpy(tracedir, "./");
break;
case 't': /* Directory where the traces are located */
if (num_global_tracefiles == 1) /* ignore if -f already encountered */
break;
strcpy(tracedir, optarg);
if (tracedir[strlen(tracedir)-1] != '/')
strcat(tracedir, "/"); /* path always ends with "/" */
break;
case 'l': /* Run libc malloc */
run_libc = true;
break;
case 'V': /* Increase verbosity level */
verbose += 1;
break;
case 'v': /* Set verbosity level */
verbose = atoi(optarg);
break;
case 'd':
debug_mode = atoi(optarg);
break;
case 'D':
debug_mode = DBG_EXPENSIVE;
break;
case 's':
set_timeout = atoi(optarg);
break;
case 'T':
tab_mode = true;
break;
case 'h': /* Print this message */
usage(argv[0]);
exit(0);
default:
usage(argv[0]);
exit(1);
}
}
#endif /* !REF_ONLY */
if (num_global_tracefiles == 0) {
int i;
for (i = 0; default_tracefiles[i]; i++)
add_tracefile(default_tracefiles[i]);
}
if (debug_mode != DBG_NONE) {
init_random_data();
}
/* Initialize the timeout */
if (set_timeout > 0) {
signal(SIGALRM, timeout_handler);
alarm(set_timeout);
}
/*
* Optionally run and evaluate the libc malloc package
*/
if (run_libc) {
if (verbose > 1)
printf("\nTesting libc malloc\n");
/* Allocate libc stats array, with one stats_t struct per tracefile */
libc_stats = (stats_t *)calloc(num_global_tracefiles, sizeof(stats_t));
if (libc_stats == NULL)
unix_error("libc_stats calloc in main failed");
/* Evaluate the libc malloc package using the K-best scheme */
for (i=0; i < num_global_tracefiles; i++) {
trace_t *trace = read_trace(&libc_stats[i], tracedir, global_tracefiles[i]);
if (verbose > 1)
printf("Checking libc malloc for correctness, ");
libc_stats[i].valid = eval_libc_valid(trace);
if (libc_stats[i].valid) {
speed_params.trace = trace;
if (verbose > 1)
printf("and performance.\n");
libc_stats[i].secs = fsec(eval_libc_speed, &speed_params);
}
free_trace(trace);
}
/* Display the libc results in a compact table and return the
summary statistics */
if (verbose) {
printf("\nResults for libc malloc:\n");
printresults(num_global_tracefiles, libc_stats, &global_libc_sum_stats);
}
}
#if !REF_ONLY
/*
* Get benchmark throughput
*/
ref_throughput = measure_ref_throughput();
min_throughput_checkpoint = ref_throughput * MIN_SPEED_RATIO_CHECKPOINT;
max_throughput_checkpoint = ref_throughput * MAX_SPEED_RATIO_CHECKPOINT;
min_throughput = ref_throughput * MIN_SPEED_RATIO;
max_throughput = ref_throughput * MAX_SPEED_RATIO;
#endif
/*
* Always run and evaluate the student's mm package
*/
if (verbose > 1)
printf("\nTesting mm malloc\n");
/* Allocate the mm stats array, with one stats_t struct per tracefile */
mm_stats = (stats_t *)calloc(num_global_tracefiles, sizeof(stats_t));
if (mm_stats == NULL)
unix_error("mm_stats calloc in main failed");
run_tests(num_global_tracefiles, tracedir, global_tracefiles, mm_stats,
&speed_params);
/* Display the mm results in a compact table */
if (verbose) {
if (onetime_flag) {
printf("\n\ncorrectness check finished, by running tracefile \"%s\".\n",
global_tracefiles[num_global_tracefiles-1]);
if (mm_stats[num_global_tracefiles-1].valid) {
printf(" => correct.\n\n");
} else {
printf(" => incorrect.\n\n");
}
} else {
printf("\nResults for mm malloc:\n");
printresults(num_global_tracefiles, mm_stats, &global_mm_sum_stats);
printf("\n");
}
}
/* Optionally compare the performance of mm and libc */
if (run_libc) {
printf("Comparison with libc malloc: mm/libc = %.0f Kops / %.0f Kops = %.2f\n",
(float)global_mm_sum_stats.tput, (float)global_libc_sum_stats.tput,
(float)(global_mm_sum_stats.tput/global_libc_sum_stats.tput));
}
/*
* Accumulate the aggregate statistics for the student's mm package
*/
secs = 0;
ops = 0;
util = 0;
numcorrect = 0;
/*
* trace weight:
* weight 0 => ignore
* 1 => count both util and perf
* 2 => count only util
* 3 => count only perf
*/
for (i=0; i < num_global_tracefiles; i++) {
if (mm_stats[i].weight == WALL || mm_stats[i].weight == WPERF)
{
secs += mm_stats[i].secs;
ops += mm_stats[i].ops;
perf_weight++;
}
if (mm_stats[i].weight == WALL || mm_stats[i].weight == WUTIL)
{
util += mm_stats[i].util;
util_weight++;
}
if (mm_stats[i].valid)
numcorrect++;
}
/*
* Compute and print the correctness and performance index
*/
correctindex = ((double)numcorrect / (double)num_global_tracefiles) * 50.0;
if (errors == 0) {
if (util_weight == 0) {
avg_mm_util = 0;
} else {
avg_mm_util = util/util_weight;
}
if (perf_weight == 0) {
avg_mm_throughput = 0;
} else {
/* Measure in KOPS */
avg_mm_throughput = (secs == 0) ? 0 : ops/secs * 0.001;
}
// p1_checkpoint = score_component(avg_mm_util, MIN_SPACE_CHECKPOINT, MAX_SPACE_CHECKPOINT);
// p2_checkpoint = score_component(avg_mm_throughput, min_throughput_checkpoint, max_throughput_checkpoint);
// perfindex_checkpoint = (p1_checkpoint * UTIL_WEIGHT + p2_checkpoint * (1.0 - UTIL_WEIGHT)) * 100.0;
p1 = score_component(avg_mm_util, MIN_SPACE, MAX_SPACE);
p2 = score_component(avg_mm_throughput, min_throughput, max_throughput);
perfindex = (p1 * UTIL_WEIGHT + p2 * (1.0 - UTIL_WEIGHT)) * 100.0;
#if !REF_ONLY
if (!tab_mode) {
printf("Average utilization = %.1f%%. Average throughput = %.0f Kops/sec\n",
avg_mm_util * 100.0,
avg_mm_throughput);
}
#endif
}
else { /* There were errors */
// p1_checkpoint = 0.0;
// p2_checkpoint = 0.0;
// perfindex_checkpoint = 0.0;
p1 = 0.0;
p2 = 0.0;
perfindex = 0.0;
avg_mm_util = 0.0;
avg_mm_throughput = 0.0;
printf("Terminated with %d errors\n", errors);
}
#if REF_ONLY
printf("%.0f\n", avg_mm_throughput);
#else /* !REF_ONLY */
if (verbose > 0) {
printf("\n");
printf("***Checkpoint 1 correctness index = %.1f/50.0***\n",
correctindex);
printf("\n");
// printf("***Checkpoint 2 perf index = %.1f (util) + %.1f (thru) = %.1f/100.0***\n",
// p1_checkpoint*UTIL_WEIGHT*100,
// p2_checkpoint*(1.0 - UTIL_WEIGHT)*100,
// perfindex_checkpoint);
printf("Average utilization = %.1f%%. Average throughput = %.0f Kops/sec\n",
avg_mm_util * 100.0,
avg_mm_throughput);
printf("Utilization targets: min=%.1f%%, max=%.1f%%\n",
MIN_SPACE_CHECKPOINT * 100.0, MAX_SPACE_CHECKPOINT * 100.0);
printf("Throughput targets: min=%.0f, max=%.0f, benchmark=%.0f\n",
min_throughput_checkpoint, max_throughput_checkpoint, ref_throughput);
printf("\n");
printf("***Final perf index = %.1f (util) + %.1f (thru) = %.1f/100.0***\n",
p1*UTIL_WEIGHT*100,
p2*(1.0 - UTIL_WEIGHT)*100,
perfindex);
printf("Average utilization = %.1f%%. Average throughput = %.0f Kops/sec\n",
avg_mm_util * 100.0,
avg_mm_throughput);
printf("Utilization targets: min=%.1f%%, max=%.1f%%\n",
MIN_SPACE * 100.0, MAX_SPACE * 100.0);
printf("Throughput targets: min=%.0f, max=%.0f, benchmark=%.0f\n",
min_throughput, max_throughput, ref_throughput);
printf("\n");
}
printf("Score: Checkpoint 1: %d / 50, Final: %d / 100\n",
(int)ceil(correctindex),
(int)ceil(perfindex));
#endif
exit(0);
}
/*****************************************************************
* Add trace to global list of tracefiles
****************************************************************/
static void add_tracefile(char *trace) {
global_tracefiles = realloc(global_tracefiles,
(num_global_tracefiles+1) * sizeof(char *));
global_tracefiles[num_global_tracefiles++] = strdup(trace);
}
/*****************************************************************
* The following routines manipulate the range list, which keeps
* track of the extent of every allocated block payload. We use the
* range list to detect any overlapping allocated blocks.
****************************************************************/
/*
* new_range_set - Create an empty range set
*/
static range_set_t *new_range_set() {
range_set_t *ranges = (range_set_t *) malloc(sizeof(range_set_t));
ranges->list = NULL;
ranges->lo_tree = tree_new();
return ranges;
}
/*
* add_range - As directed by request opnum in trace tracenum,
* we've just called the student's mm_malloc to allocate a block of
* size bytes at addr lo. After checking the block for correctness,
* we create a range struct for this block and add it to the range list.
*/
static bool add_range(range_set_t *ranges, char *lo, size_t size,
const trace_t *trace, int opnum, int index) {
char *hi = lo + size - 1;
assert(size > 0);
/* Payload addresses must be ALIGNMENT-byte aligned */
if (!IS_ALIGNED(lo)) {
malloc_error(trace, opnum,
"Payload address (%p) not aligned to %d bytes", lo, ALIGNMENT);
return false;
}
/* The payload must lie within the extent of the heap */
if ((lo < (char *)mem_heap_lo()) || (lo > (char *)mem_heap_hi()) ||
(hi < (char *)mem_heap_lo()) || (hi > (char *)mem_heap_hi())) {
malloc_error(trace, opnum,
"Payload (%p:%p) lies outside heap (%p:%p)",
lo, hi, mem_heap_lo(), mem_heap_hi());
return false;
}
/* If we can't afford the linear-time loop, we check less thoroughly and
just assume the overlap will be caught by writing random bits. */
if (debug_mode == DBG_NONE) return 1;
/* Look in the tree for the predecessor block */
range_t *prev = tree_find_nearest(ranges->lo_tree, (long unsigned) lo);
range_t *next = prev ? prev->next : NULL;
/* See if it overlaps previous or next blocks */
if (prev && lo <= prev->hi) {
malloc_error(trace, opnum,
"Payload (%p:%p) overlaps another payload (%p:%p)\n",
lo, hi, prev->lo, prev->hi);
return false;
}
if (next && hi >= next->lo) {
malloc_error(trace, opnum,
"Payload (%p:%p) overlaps another payload (%p:%p)\n",
lo, hi, next->lo, next->hi);
return false;
}
/*
* Everything looks OK, so remember the extent of this block
* by creating a range struct and adding it the range list.
*/
range_t *p;
if ((p = (range_t *)malloc(sizeof(range_t))) == NULL)
unix_error("malloc error in add_range");
p->prev = prev;
if (prev)
prev->next = p;
else
ranges->list = p;
p->next = next;
if (next)
next->prev = p;
p->lo = lo;
p->hi = hi;
p->index = index;
tree_insert(ranges->lo_tree, (long unsigned) lo, (void *) p);
return true;
}
/*
* remove_range - Free the range record of block whose payload starts at lo
*/
static void remove_range(range_set_t *ranges, char *lo)
{
range_t *p = (range_t *) tree_remove(ranges->lo_tree, (long unsigned) lo);
if (!p)
return;
range_t *prev = p->prev;
range_t *next = p->next;
if (prev)
prev->next = next;
else
ranges->list = next;
if (next)
next->prev = prev;
free(p);
}
/*
* free_range_set - free all of the range records for a trace
*/
static void free_range_set(range_set_t *ranges)
{
tree_free(ranges->lo_tree, free);
free(ranges);
}
/**********************************************
* The following routines handle the random data used for
* checking memory access.
*********************************************/
static void init_random_data(void) {
int len;
if (debug_mode == DBG_NONE) return;
for(len = 0; len < RANDOM_DATA_LEN; ++len) {
random_data[len] = random();
}
}
static void randomize_block(trace_t *traces, int index) {
size_t size, fsize, fsize_end;
size_t i;
randint_t *block, *block_end;
int base;
if (debug_mode == DBG_NONE) return;
traces->block_rand_base[index] = random();
block = (randint_t*)traces->blocks[index];
size = traces->block_sizes[index] / sizeof(*block);
if (size == 0)
return;
fsize = size;
if (fsize > maxfill) {
fsize = maxfill;
if (size > (2 * fsize)) {
fsize_end = fsize;
block_end = block + (size - fsize_end);
} else {
fsize_end = size - fsize;
block_end = block + fsize;
}
} else {
fsize_end = 0;
block_end = NULL;
}
base = traces->block_rand_base[index];
// NOTE: It's expensive to do this one byte at a time.
// NOTE: It would be nice to also fill in at end of block, but
// this gets messy with REALLOC
for(i = 0; i < fsize; i++) {
mem_write(&block[i],
random_data[(base + i) % RANDOM_DATA_LEN],
sizeof(randint_t));
}
for(i = 0; i < fsize_end; i++) {
mem_write(&block_end[i],
random_data[(base + i) % RANDOM_DATA_LEN],
sizeof(randint_t));
}
}
static bool check_index(const trace_t *trace, int opnum, int index, int realloc) {
size_t size, fsize, fsize_end;
size_t i;
randint_t *block, *block_end;
int base;
int ngarbled = 0;
int firstgarbled = -1;
if (index < 0) return true; /* we're doing free(NULL) */
if (debug_mode == DBG_NONE) return true;
block = (randint_t*)trace->blocks[index];
size = trace->block_sizes[index] / sizeof(*block);
if (size == 0)
return true;
fsize = size;
if (fsize > maxfill) {
fsize = maxfill;
if (size > (2 * fsize)) {
fsize_end = fsize;
block_end = block + (size - fsize_end);
} else {
fsize_end = size - fsize;
block_end = block + fsize;
}
} else {
fsize_end = 0;
block_end = NULL;
}
if (realloc) { // skip check after realloc
fsize_end = 0;
}
base = trace->block_rand_base[index];
// NOTE: It's expensive to do this one byte at a time.
for(i = 0; i < fsize; i++) {
if (mem_read(&block[i], sizeof(randint_t)) != random_data[(base + i) % RANDOM_DATA_LEN]) {
if (firstgarbled == -1) firstgarbled = i;
ngarbled++;
}
}
for(i = 0; i < fsize_end; i++) {
if (mem_read(&block_end[i], sizeof(randint_t)) != random_data[(base + i) % RANDOM_DATA_LEN]) {
if (firstgarbled == -1) firstgarbled = i;
ngarbled++;
}
}
if (ngarbled != 0) {
malloc_error(trace, opnum, "block %d has %d garbled %s%s, "
"starting at byte %zu", index, ngarbled, randint_t_name,
ngarbled > 1 ? "s" : "", sizeof(randint_t) * firstgarbled);
return false;
}
return true;
}
/**********************************************
* The following routines manipulate tracefiles
*********************************************/
/*
* read_trace - read a trace file and store it in memory
*/
static trace_t *read_trace(stats_t *stats, const char *tracedir,
const char *filename)
{
FILE *tracefile;
trace_t *trace;
char type[MAXLINE];
int index;
size_t size;
int max_index = 0;
int op_index;
int ignore = 0;
if (verbose > 1)
printf("Reading tracefile: %s\n", filename);
/* Allocate the trace record */
if ((trace = (trace_t *) malloc(sizeof(trace_t))) == NULL)
unix_error("malloc 1 failed in read_trace");
/* Read the trace file header */
strcpy(trace->filename, tracedir);
strcat(trace->filename, filename);
if ((tracefile = fopen(trace->filename, "r")) == NULL) {
unix_error("Could not open %s in read_trace", trace->filename);
}
int iweight;
ignore += fscanf(tracefile, "%d", &iweight);
trace->weight = iweight;
ignore += fscanf(tracefile, "%d", &trace->num_ids);
ignore += fscanf(tracefile, "%d", &trace->num_ops);
ignore += fscanf(tracefile, "%zd", &trace->data_bytes);
if (((unsigned int)trace->weight) > 3u) {
app_error("%s: weight can only be in {0, 1, 2 3}", trace->filename);
}
/* We'll store each request line in the trace in this array */
if ((trace->ops =
(traceop_t *)malloc(trace->num_ops * sizeof(traceop_t))) == NULL)
unix_error("malloc 2 failed in read_trace");
/* We'll keep an array of pointers to the allocated blocks here... */
if ((trace->blocks =
(char **)calloc(trace->num_ids, sizeof(char *))) == NULL)
unix_error("malloc 3 failed in read_trace");
/* ... along with the corresponding byte sizes of each block */
if ((trace->block_sizes =
(size_t *)calloc(trace->num_ids, sizeof(size_t))) == NULL)
unix_error("malloc 4 failed in read_trace");
/* and, if we're debugging, the offset into the random data */
if ((trace->block_rand_base =
calloc(trace->num_ids, sizeof(*trace->block_rand_base))) == NULL)
unix_error("malloc 5 failed in read_trace");
/* read every request line in the trace file */
index = 0;
op_index = 0;
while (fscanf(tracefile, "%s", type) != EOF) {
switch(type[0]) {
case 'a':
ignore += fscanf(tracefile, "%u %lu", &index, &size);
trace->ops[op_index].type = ALLOC;
trace->ops[op_index].index = index;
trace->ops[op_index].size = size;
max_index = (index > max_index) ? index : max_index;
break;
case 'r':
ignore += fscanf(tracefile, "%u %lu", &index, &size);
trace->ops[op_index].type = REALLOC;
trace->ops[op_index].index = index;
trace->ops[op_index].size = size;
max_index = (index > max_index) ? index : max_index;
break;
case 'f':
ignore += fscanf(tracefile, "%u", &index);
trace->ops[op_index].type = FREE;
trace->ops[op_index].index = index;
break;
default:
app_error("Bogus type character (%c) in tracefile %s\n",
type[0], trace->filename);
}
op_index++;
if (op_index == trace->num_ops) break;
}
fclose(tracefile);
assert(max_index == trace->num_ids - 1);
assert(trace->num_ops == op_index);
/* fill in the stats */
strcpy(stats->filename, trace->filename);
stats->weight = trace->weight;
stats->ops = trace->num_ops;
return trace;
}
/*
* reinit_trace - get the trace ready for another run.
*/