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malloc-lab/mdriver.c

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/*
* mdriver.c - CS:APP Malloc Lab Driver
*
* Uses a collection of trace files to tests a malloc/free/realloc
* implementation in mm.c.
*
* Copyright (c) 2002, R. Bryant and D. O'Hallaron, All rights reserved.
* May not be used, modified, or copied without permission.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <assert.h>
#include <float.h>
#include <time.h>
#include "mm.h"
#include "memlib.h"
#include "fsecs.h"
#include "config.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+5) /* cnvt trace request nums to linenums (origin 1) */
/* Returns true if p is ALIGNMENT-byte aligned */
#define IS_ALIGNED(p) ((((unsigned int)(p)) % ALIGNMENT) == 0)
/******************************
* The key compound data types
*****************************/
/* Records the extent of each block's payload */
typedef struct range_t {
char *lo; /* low payload address */
char *hi; /* high payload address */
struct range_t *next; /* next list element */
} range_t;
/* Characterizes a single trace operation (allocator request) */
typedef struct {
enum {ALLOC, FREE, REALLOC} type; /* type of request */
int index; /* index for free() to use later */
int size; /* byte size of alloc/realloc request */
} traceop_t;
/* Holds the information for one trace file*/
typedef struct {
int sugg_heapsize; /* suggested heap size (unused) */
int num_ids; /* number of alloc/realloc ids */
int num_ops; /* number of distinct requests */
int weight; /* weight for this trace (unused) */
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 */
} 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_t *ranges;
} speed_t;
/* Summarizes the important stats for some malloc function on some trace */
typedef struct {
/* defined for both libc malloc and student malloc package (mm.c) */
double ops; /* number of ops (malloc/free/realloc) in the trace */
int 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;
/********************
* Global variables
*******************/
int verbose = 0; /* global flag for verbose output */
static int errors = 0; /* number of errs found when running student malloc */
char msg[MAXLINE]; /* for whenever we need to compose an error message */
/* Directory where default tracefiles are found */
static char tracedir[MAXLINE] = TRACEDIR;
/* The filenames of the default tracefiles */
static char *default_tracefiles[] = {
DEFAULT_TRACEFILES, NULL
};
/*********************
* Function prototypes
*********************/
/* these functions manipulate range lists */
static int add_range(range_t **ranges, char *lo, int size,
int tracenum, int opnum);
static void remove_range(range_t **ranges, char *lo);
static void clear_ranges(range_t **ranges);
/* These functions read, allocate, and free storage for traces */
static trace_t *read_trace(char *tracedir, char *filename);
static void free_trace(trace_t *trace);
/* Routines for evaluating the correctness and speed of libc malloc */
static int eval_libc_valid(trace_t *trace, int tracenum);
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 int eval_mm_valid(trace_t *trace, int tracenum, range_t **ranges);
static double eval_mm_util(trace_t *trace, int tracenum, range_t **ranges);
static void eval_mm_speed(void *ptr);
/* Various helper routines */
static void printresults(int n, stats_t *stats);
static void usage(void);
static void unix_error(char *msg);
static void malloc_error(int tracenum, int opnum, char *msg);
static void app_error(char *msg);
/**************
* Main routine
**************/
int main(int argc, char **argv)
{
int i;
char c;
char **tracefiles = NULL; /* null-terminated array of trace file names */
int num_tracefiles = 0; /* the number of traces in that array */
trace_t *trace = NULL; /* stores a single trace file in memory */
range_t *ranges = NULL; /* keeps track of block extents for one trace */
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 */
int team_check = 1; /* If set, check team structure (reset by -a) */
int run_libc = 0; /* If set, run libc malloc (set by -l) */
int autograder = 0; /* If set, emit summary info for autograder (-g) */
/* temporaries used to compute the performance index */
double secs, ops, util, avg_mm_util, avg_mm_throughput, p1, p2, perfindex;
int numcorrect;
/*
* Read and interpret the command line arguments
*/
while ((c = getopt(argc, argv, "f:t:hvVgal")) != EOF) {
switch (c) {
case 'g': /* Generate summary info for the autograder */
autograder = 1;
break;
case 'f': /* Use one specific trace file only (relative to curr dir) */
num_tracefiles = 1;
if ((tracefiles = realloc(tracefiles, 2*sizeof(char *))) == NULL)
unix_error("ERROR: realloc failed in main");
strcpy(tracedir, "./");
tracefiles[0] = strdup(optarg);
tracefiles[1] = NULL;
break;
case 't': /* Directory where the traces are located */
if (num_tracefiles == 1) /* ignore if -f already encountered */
break;
strcpy(tracedir, optarg);
if (tracedir[strlen(tracedir)-1] != '/')
strcat(tracedir, "/"); /* path always ends with "/" */
break;
case 'a': /* Don't check team structure */
team_check = 0;
break;
case 'l': /* Run libc malloc */
run_libc = 1;
break;
case 'v': /* Print per-trace performance breakdown */
verbose = 1;
break;
case 'V': /* Be more verbose than -v */
verbose = 2;
break;
case 'h': /* Print this message */
usage();
exit(0);
default:
usage();
exit(1);
}
}
/*
* Check and print team info
*/
if (team_check) {
/* Students must fill in their team information */
if (!strcmp(team.teamname, "")) {
printf("ERROR: Please provide the information about your team in mm.c.\n");
exit(1);
} else
printf("Team Name:%s\n", team.teamname);
if ((*team.name1 == '\0') || (*team.id1 == '\0')) {
printf("ERROR. You must fill in all team member 1 fields!\n");
exit(1);
}
else
printf("Member 1 :%s:%s\n", team.name1, team.id1);
if (((*team.name2 != '\0') && (*team.id2 == '\0')) ||
((*team.name2 == '\0') && (*team.id2 != '\0'))) {
printf("ERROR. You must fill in all or none of the team member 2 ID fields!\n");
exit(1);
}
else if (*team.name2 != '\0')
printf("Member 2 :%s:%s\n", team.name2, team.id2);
}
/*
* If no -f command line arg, then use the entire set of tracefiles
* defined in default_traces[]
*/
if (tracefiles == NULL) {
tracefiles = default_tracefiles;
num_tracefiles = sizeof(default_tracefiles) / sizeof(char *) - 1;
printf("Using default tracefiles in %s\n", tracedir);
}
/* Initialize the timing package */
init_fsecs();
/*
* 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_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_tracefiles; i++) {
trace = read_trace(tracedir, tracefiles[i]);
libc_stats[i].ops = trace->num_ops;
if (verbose > 1)
printf("Checking libc malloc for correctness, ");
libc_stats[i].valid = eval_libc_valid(trace, i);
if (libc_stats[i].valid) {
speed_params.trace = trace;
if (verbose > 1)
printf("and performance.\n");
libc_stats[i].secs = fsecs(eval_libc_speed, &speed_params);
}
free_trace(trace);
}
/* Display the libc results in a compact table */
if (verbose) {
printf("\nResults for libc malloc:\n");
printresults(num_tracefiles, libc_stats);
}
}
/*
* 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_tracefiles, sizeof(stats_t));
if (mm_stats == NULL)
unix_error("mm_stats calloc in main failed");
/* Initialize the simulated memory system in memlib.c */
mem_init();
/* Evaluate student's mm malloc package using the K-best scheme */
for (i=0; i < num_tracefiles; i++) {
trace = read_trace(tracedir, tracefiles[i]);
mm_stats[i].ops = trace->num_ops;
if (verbose > 1)
printf("Checking mm_malloc for correctness, ");
mm_stats[i].valid = eval_mm_valid(trace, i, &ranges);
if (mm_stats[i].valid) {
if (verbose > 1)
printf("efficiency, ");
mm_stats[i].util = eval_mm_util(trace, i, &ranges);
speed_params.trace = trace;
speed_params.ranges = ranges;
if (verbose > 1)
printf("and performance.\n");
mm_stats[i].secs = fsecs(eval_mm_speed, &speed_params);
}
free_trace(trace);
}
/* Display the mm results in a compact table */
if (verbose) {
printf("\nResults for mm malloc:\n");
printresults(num_tracefiles, mm_stats);
printf("\n");
}
/*
* Accumulate the aggregate statistics for the student's mm package
*/
secs = 0;
ops = 0;
util = 0;
numcorrect = 0;
for (i=0; i < num_tracefiles; i++) {
secs += mm_stats[i].secs;
ops += mm_stats[i].ops;
util += mm_stats[i].util;
if (mm_stats[i].valid)
numcorrect++;
}
avg_mm_util = util/num_tracefiles;
/*
* Compute and print the performance index
*/
if (errors == 0) {
avg_mm_throughput = ops/secs;
p1 = UTIL_WEIGHT * avg_mm_util;
if (avg_mm_throughput > AVG_LIBC_THRUPUT) {
p2 = (double)(1.0 - UTIL_WEIGHT);
}
else {
p2 = ((double) (1.0 - UTIL_WEIGHT)) *
(avg_mm_throughput/AVG_LIBC_THRUPUT);
}
perfindex = (p1 + p2)*100.0;
printf("Perf index = %.0f (util) + %.0f (thru) = %.0f/100\n",
p1*100,
p2*100,
perfindex);
}
else { /* There were errors */
perfindex = 0.0;
printf("Terminated with %d errors\n", errors);
}
if (autograder) {
printf("correct:%d\n", numcorrect);
printf("perfidx:%.0f\n", perfindex);
}
exit(0);
}
/*****************************************************************
* 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.
****************************************************************/
/*
* 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 int add_range(range_t **ranges, char *lo, int size,
int tracenum, int opnum)
{
char *hi = lo + size - 1;
range_t *p;
char msg[MAXLINE];
assert(size > 0);
/* Payload addresses must be ALIGNMENT-byte aligned */
if (!IS_ALIGNED(lo)) {
sprintf(msg, "Payload address (%p) not aligned to %d bytes",
lo, ALIGNMENT);
malloc_error(tracenum, opnum, msg);
return 0;
}
/* 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())) {
sprintf(msg, "Payload (%p:%p) lies outside heap (%p:%p)",
lo, hi, mem_heap_lo(), mem_heap_hi());
malloc_error(tracenum, opnum, msg);
return 0;
}
/* The payload must not overlap any other payloads */
for (p = *ranges; p != NULL; p = p->next) {
if ((lo >= p->lo && lo <= p-> hi) ||
(hi >= p->lo && hi <= p->hi)) {
sprintf(msg, "Payload (%p:%p) overlaps another payload (%p:%p)\n",
lo, hi, p->lo, p->hi);
malloc_error(tracenum, opnum, msg);
return 0;
}
}
/*
* Everything looks OK, so remember the extent of this block
* by creating a range struct and adding it the range list.
*/
if ((p = (range_t *)malloc(sizeof(range_t))) == NULL)
unix_error("malloc error in add_range");
p->next = *ranges;
p->lo = lo;
p->hi = hi;
*ranges = p;
return 1;
}
/*
* remove_range - Free the range record of block whose payload starts at lo
*/
static void remove_range(range_t **ranges, char *lo)
{
range_t *p;
range_t **prevpp = ranges;
int size;
for (p = *ranges; p != NULL; p = p->next) {
if (p->lo == lo) {
*prevpp = p->next;
size = p->hi - p->lo + 1;
free(p);
break;
}
prevpp = &(p->next);
}
}
/*
* clear_ranges - free all of the range records for a trace
*/
static void clear_ranges(range_t **ranges)
{
range_t *p;
range_t *pnext;
for (p = *ranges; p != NULL; p = pnext) {
pnext = p->next;
free(p);
}
*ranges = NULL;
}
/**********************************************
* The following routines manipulate tracefiles
*********************************************/
/*
* read_trace - read a trace file and store it in memory
*/
static trace_t *read_trace(char *tracedir, char *filename)
{
FILE *tracefile;
trace_t *trace;
char type[MAXLINE];
char path[MAXLINE];
unsigned index, size;
unsigned max_index = 0;
unsigned op_index;
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_trance");
/* Read the trace file header */
strcpy(path, tracedir);
strcat(path, filename);
if ((tracefile = fopen(path, "r")) == NULL) {
sprintf(msg, "Could not open %s in read_trace", path);
unix_error(msg);
}
fscanf(tracefile, "%d", &(trace->sugg_heapsize)); /* not used */
fscanf(tracefile, "%d", &(trace->num_ids));
fscanf(tracefile, "%d", &(trace->num_ops));
fscanf(tracefile, "%d", &(trace->weight)); /* not used */
/* 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 **)malloc(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 *)malloc(trace->num_ids * sizeof(size_t))) == NULL)
unix_error("malloc 4 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':
fscanf(tracefile, "%u %u", &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':
fscanf(tracefile, "%u %u", &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':
fscanf(tracefile, "%ud", &index);
trace->ops[op_index].type = FREE;
trace->ops[op_index].index = index;
break;
default:
printf("Bogus type character (%c) in tracefile %s\n",
type[0], path);
exit(1);
}
op_index++;
}
fclose(tracefile);
assert(max_index == trace->num_ids - 1);
assert(trace->num_ops == op_index);
return trace;
}
/*
* free_trace - Free the trace record and the three arrays it points
* to, all of which were allocated in read_trace().
*/
void free_trace(trace_t *trace)
{
free(trace->ops); /* free the three arrays... */
free(trace->blocks);
free(trace->block_sizes);
free(trace); /* and the trace record itself... */
}
/**********************************************************************
* The following functions evaluate the correctness, space utilization,
* and throughput of the libc and mm malloc packages.
**********************************************************************/
/*
* eval_mm_valid - Check the mm malloc package for correctness
*/
static int eval_mm_valid(trace_t *trace, int tracenum, range_t **ranges)
{
int i, j;
int index;
int size;
int oldsize;
char *newp;
char *oldp;
char *p;
/* Reset the heap and free any records in the range list */
mem_reset_brk();
clear_ranges(ranges);
/* Call the mm package's init function */
if (mm_init() < 0) {
malloc_error(tracenum, 0, "mm_init failed.");
return 0;
}
/* Interpret each operation in the trace in order */
for (i = 0; i < trace->num_ops; i++) {
index = trace->ops[i].index;
size = trace->ops[i].size;
switch (trace->ops[i].type) {
case ALLOC: /* mm_malloc */
/* Call the student's malloc */
if ((p = mm_malloc(size)) == NULL) {
malloc_error(tracenum, i, "mm_malloc failed.");
return 0;
}
/*
* Test the range of the new block for correctness and add it
* to the range list if OK. The block must be be aligned properly,
* and must not overlap any currently allocated block.
*/
if (add_range(ranges, p, size, tracenum, i) == 0)
return 0;
/* ADDED: cgw
* fill range with low byte of index. This will be used later
* if we realloc the block and wish to make sure that the old
* data was copied to the new block
*/
memset(p, index & 0xFF, size);
/* Remember region */
trace->blocks[index] = p;
trace->block_sizes[index] = size;
break;
case REALLOC: /* mm_realloc */
/* Call the student's realloc */
oldp = trace->blocks[index];
if ((newp = mm_realloc(oldp, size)) == NULL) {
malloc_error(tracenum, i, "mm_realloc failed.");
return 0;
}
/* Remove the old region from the range list */
remove_range(ranges, oldp);
/* Check new block for correctness and add it to range list */
if (add_range(ranges, newp, size, tracenum, i) == 0)
return 0;
/* ADDED: cgw
* Make sure that the new block contains the data from the old
* block and then fill in the new block with the low order byte
* of the new index
*/
oldsize = trace->block_sizes[index];
if (size < oldsize) oldsize = size;
for (j = 0; j < oldsize; j++) {
if (newp[j] != (index & 0xFF)) {
malloc_error(tracenum, i, "mm_realloc did not preserve the "
"data from old block");
return 0;
}
}
memset(newp, index & 0xFF, size);
/* Remember region */
trace->blocks[index] = newp;
trace->block_sizes[index] = size;
break;
case FREE: /* mm_free */
/* Remove region from list and call student's free function */
p = trace->blocks[index];
remove_range(ranges, p);
mm_free(p);
break;
default:
app_error("Nonexistent request type in eval_mm_valid");
}
}
/* As far as we know, this is a valid malloc package */
return 1;
}
/*
* eval_mm_util - Evaluate the space utilization of the student's package
* The idea is to remember the high water mark "hwm" of the heap for
* an optimal allocator, i.e., no gaps and no internal fragmentation.
* Utilization is the ratio hwm/heapsize, where heapsize is the
* size of the heap in bytes after running the student's malloc
* package on the trace. Note that our implementation of mem_sbrk()
* doesn't allow the students to decrement the brk pointer, so brk
* is always the high water mark of the heap.
*
*/
static double eval_mm_util(trace_t *trace, int tracenum, range_t **ranges)
{
int i;
int index;
int size, newsize, oldsize;
int max_total_size = 0;
int total_size = 0;
char *p;
char *newp, *oldp;
/* initialize the heap and the mm malloc package */
mem_reset_brk();
if (mm_init() < 0)
app_error("mm_init failed in eval_mm_util");
for (i = 0; i < trace->num_ops; i++) {
switch (trace->ops[i].type) {
case ALLOC: /* mm_alloc */
index = trace->ops[i].index;
size = trace->ops[i].size;
if ((p = mm_malloc(size)) == NULL)
app_error("mm_malloc failed in eval_mm_util");
/* Remember region and size */
trace->blocks[index] = p;
trace->block_sizes[index] = size;
/* Keep track of current total size
* of all allocated blocks */
total_size += size;
/* Update statistics */
max_total_size = (total_size > max_total_size) ?
total_size : max_total_size;
break;
case REALLOC: /* mm_realloc */
index = trace->ops[i].index;
newsize = trace->ops[i].size;
oldsize = trace->block_sizes[index];
oldp = trace->blocks[index];
if ((newp = mm_realloc(oldp,newsize)) == NULL)
app_error("mm_realloc failed in eval_mm_util");
/* Remember region and size */
trace->blocks[index] = newp;
trace->block_sizes[index] = newsize;
/* Keep track of current total size
* of all allocated blocks */
total_size += (newsize - oldsize);
/* Update statistics */
max_total_size = (total_size > max_total_size) ?
total_size : max_total_size;
break;
case FREE: /* mm_free */
index = trace->ops[i].index;
size = trace->block_sizes[index];
p = trace->blocks[index];
mm_free(p);
/* Keep track of current total size
* of all allocated blocks */
total_size -= size;
break;
default:
app_error("Nonexistent request type in eval_mm_util");
}
}
return ((double)max_total_size / (double)mem_heapsize());
}
/*
* eval_mm_speed - This is the function that is used by fcyc()
* to measure the running time of the mm malloc package.
*/
static void eval_mm_speed(void *ptr)
{
int i, index, size, newsize;
char *p, *newp, *oldp, *block;
trace_t *trace = ((speed_t *)ptr)->trace;
/* Reset the heap and initialize the mm package */
mem_reset_brk();
if (mm_init() < 0)
app_error("mm_init failed in eval_mm_speed");
/* Interpret each trace request */
for (i = 0; i < trace->num_ops; i++)
switch (trace->ops[i].type) {
case ALLOC: /* mm_malloc */
index = trace->ops[i].index;
size = trace->ops[i].size;
if ((p = mm_malloc(size)) == NULL)
app_error("mm_malloc error in eval_mm_speed");
trace->blocks[index] = p;
break;
case REALLOC: /* mm_realloc */
index = trace->ops[i].index;
newsize = trace->ops[i].size;
oldp = trace->blocks[index];
if ((newp = mm_realloc(oldp,newsize)) == NULL)
app_error("mm_realloc error in eval_mm_speed");
trace->blocks[index] = newp;
break;
case FREE: /* mm_free */
index = trace->ops[i].index;
block = trace->blocks[index];
mm_free(block);
break;
default:
app_error("Nonexistent request type in eval_mm_valid");
}
}
/*
* eval_libc_valid - We run this function to make sure that the
* libc malloc can run to completion on the set of traces.
* We'll be conservative and terminate if any libc malloc call fails.
*
*/
static int eval_libc_valid(trace_t *trace, int tracenum)
{
int i, newsize;
char *p, *newp, *oldp;
for (i = 0; i < trace->num_ops; i++) {
switch (trace->ops[i].type) {
case ALLOC: /* malloc */
if ((p = malloc(trace->ops[i].size)) == NULL) {
malloc_error(tracenum, i, "libc malloc failed");
unix_error("System message");
}
trace->blocks[trace->ops[i].index] = p;
break;
case REALLOC: /* realloc */
newsize = trace->ops[i].size;
oldp = trace->blocks[trace->ops[i].index];
if ((newp = realloc(oldp, newsize)) == NULL) {
malloc_error(tracenum, i, "libc realloc failed");
unix_error("System message");
}
trace->blocks[trace->ops[i].index] = newp;
break;
case FREE: /* free */
free(trace->blocks[trace->ops[i].index]);
break;
default:
app_error("invalid operation type in eval_libc_valid");
}
}
return 1;
}
/*
* eval_libc_speed - This is the function that is used by fcyc() to
* measure the running time of the libc malloc package on the set
* of traces.
*/
static void eval_libc_speed(void *ptr)
{
int i;
int index, size, newsize;
char *p, *newp, *oldp, *block;
trace_t *trace = ((speed_t *)ptr)->trace;
for (i = 0; i < trace->num_ops; i++) {
switch (trace->ops[i].type) {
case ALLOC: /* malloc */
index = trace->ops[i].index;
size = trace->ops[i].size;
if ((p = malloc(size)) == NULL)
unix_error("malloc failed in eval_libc_speed");
trace->blocks[index] = p;
break;
case REALLOC: /* realloc */
index = trace->ops[i].index;
newsize = trace->ops[i].size;
oldp = trace->blocks[index];
if ((newp = realloc(oldp, newsize)) == NULL)
unix_error("realloc failed in eval_libc_speed\n");
trace->blocks[index] = newp;
break;
case FREE: /* free */
index = trace->ops[i].index;
block = trace->blocks[index];
free(block);
break;
}
}
}
/*************************************
* Some miscellaneous helper routines
************************************/
/*
* printresults - prints a performance summary for some malloc package
*/
static void printresults(int n, stats_t *stats)
{
int i;
double secs = 0;
double ops = 0;
double util = 0;
/* Print the individual results for each trace */
printf("%5s%7s %5s%8s%10s%6s\n",
"trace", " valid", "util", "ops", "secs", "Kops");
for (i=0; i < n; i++) {
if (stats[i].valid) {
printf("%2d%10s%5.0f%%%8.0f%10.6f%6.0f\n",
i,
"yes",
stats[i].util*100.0,
stats[i].ops,
stats[i].secs,
(stats[i].ops/1e3)/stats[i].secs);
secs += stats[i].secs;
ops += stats[i].ops;
util += stats[i].util;
}
else {
printf("%2d%10s%6s%8s%10s%6s\n",
i,
"no",
"-",
"-",
"-",
"-");
}
}
/* Print the aggregate results for the set of traces */
if (errors == 0) {
printf("%12s%5.0f%%%8.0f%10.6f%6.0f\n",
"Total ",
(util/n)*100.0,
ops,
secs,
(ops/1e3)/secs);
}
else {
printf("%12s%6s%8s%10s%6s\n",
"Total ",
"-",
"-",
"-",
"-");
}
}
/*
* app_error - Report an arbitrary application error
*/
void app_error(char *msg)
{
printf("%s\n", msg);
exit(1);
}
/*
* unix_error - Report a Unix-style error
*/
void unix_error(char *msg)
{
printf("%s: %s\n", msg, strerror(errno));
exit(1);
}
/*
* malloc_error - Report an error returned by the mm_malloc package
*/
void malloc_error(int tracenum, int opnum, char *msg)
{
errors++;
printf("ERROR [trace %d, line %d]: %s\n", tracenum, LINENUM(opnum), msg);
}
/*
* usage - Explain the command line arguments
*/
static void usage(void)
{
fprintf(stderr, "Usage: mdriver [-hvVal] [-f <file>] [-t <dir>]\n");
fprintf(stderr, "Options\n");
fprintf(stderr, "\t-a Don't check the team structure.\n");
fprintf(stderr, "\t-f <file> Use <file> as the trace file.\n");
fprintf(stderr, "\t-g Generate summary info for autograder.\n");
fprintf(stderr, "\t-h Print this message.\n");
fprintf(stderr, "\t-l Run libc malloc as well.\n");
fprintf(stderr, "\t-t <dir> Directory to find default traces.\n");
fprintf(stderr, "\t-v Print per-trace performance breakdowns.\n");
fprintf(stderr, "\t-V Print additional debug info.\n");
}
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