minix/commands/sprofalyze/sprofalyze.c
2012-08-31 20:12:57 +02:00

1009 lines
28 KiB
C
Executable file

#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <minix/profile.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/* user-configurable settings */
#define BINARY_HASHTAB_SIZE 1024
#define ENDPOINT_HASHTAB_SIZE 1024
#define DEBUG 0
#define NM "/usr/pkg/bin/nm"
static const char *default_binaries[] = {
"kernel/kernel",
"servers/",
"drivers/",
};
static const char *src_path = "/usr/src";
/* types */
#define LINE_WIDTH 80
#define SYMBOL_NAME_SIZE 52
#define SYMBOL_NAME_WIDTH 22
#define SYMBOL_SIZE_MAX 0x100000
#define PC_MAP_L1_SIZE 0x10000
#define PC_MAP_L2_SIZE 0x10000
struct binary_info;
struct symbol_count {
struct symbol_count *next;
struct binary_info *binary;
uint32_t addr;
int samples;
char name[SYMBOL_NAME_SIZE];
};
struct pc_map_l2 {
struct symbol_count *l2[PC_MAP_L2_SIZE];
};
struct pc_map_l1 {
struct pc_map_l2 *l1[PC_MAP_L1_SIZE];
};
struct binary_info {
char name[PROC_NAME_LEN];
const char *path;
int samples;
struct symbol_count *symbols;
struct pc_map_l1 *pc_map;
struct binary_info *next;
struct binary_info *hashtab_next;
char no_more_warnings;
};
struct endpoint_info {
endpoint_t endpoint;
struct binary_info *binary;
struct endpoint_info *hashtab_next;
};
union sprof_record {
struct sprof_sample sample;
struct sprof_proc proc;
};
/* global variables */
static struct binary_info *binaries;
static struct binary_info *binary_hashtab[BINARY_HASHTAB_SIZE];
static struct endpoint_info *endpoint_hashtab[ENDPOINT_HASHTAB_SIZE];
static double minimum_perc = 1.0;
static struct sprof_info_s sprof_info;
/* prototypes */
static struct binary_info *binary_add(const char *path);
static struct binary_info *binary_find(const char *name);
static struct binary_info *binary_hashtab_get(const char *name);
static struct binary_info **binary_hashtab_get_ptr(const char *name);
static void binary_load_pc_map(struct binary_info *binary_info);
static const char *binary_name(const char *path);
static int compare_binaries(const void *p1, const void *p2);
static int compare_symbols(const void *p1, const void *p2);
static int count_symbols(const struct binary_info *binary, int threshold);
static void dprint_symbols(const struct binary_info *binary);
static struct endpoint_info **endpoint_hashtab_get_ptr(endpoint_t endpoint);
static void load_trace(const char *path);
static void *malloc_checked(size_t size);
static unsigned name_hash(const char *name);
static float percent(int value, int percent_of);
static void print_diff(void);
static void print_report(void);
static void print_report_overall(void);
static void print_report_per_binary(const struct binary_info *binary);
static void print_reports_per_binary(void);
static void print_report_symbols(struct symbol_count **symbols,
unsigned symbol_count, int total, int show_binary);
static void print_separator(void);
static int read_hex(FILE *file, unsigned long *value);
static int read_newline(FILE *file);
static void read_nm_line(FILE *file, int line, char *name, char *type,
unsigned long *addr, unsigned long *size);
static void read_to_whitespace(FILE *file, char *buffer, size_t size);
static size_t sample_process(const union sprof_record *data, size_t size,
int *samples_read);
static struct binary_info *sample_load_binary(const struct sprof_proc *sample);
static void sample_store(struct binary_info *binary,
const struct sprof_sample *sample);
static char *strdup_checked(const char *s);
static void usage(const char *argv0);
#define MALLOC_CHECKED(type, count) \
((type *) malloc_checked(sizeof(type) * (count)))
#define LENGTHOF(array) (sizeof((array)) / sizeof((array)[0]))
#if DEBUG
#define dprintf(...) do { \
fprintf(stderr, "debug(%s:%d): ", __FUNCTION__, __LINE__); \
fprintf(stderr, __VA_ARGS__); \
} while(0)
#else
#define dprintf(...)
#endif
int main(int argc, char **argv) {
int opt, sprofdiff;
#ifdef DEBUG
/* disable buffering so the output mixes correctly */
setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(stderr, NULL, _IONBF, 0);
#endif
/* parse arguments */
while ((opt = getopt(argc, argv, "b:dp:s:")) != -1) {
switch (opt) {
case 'b':
/* additional binary specified */
binary_add(optarg);
break;
case 'd':
/* generate output for sprofdiff */
sprofdiff = 1;
break;
case 'p':
/* minimum percentage specified */
minimum_perc = atof(optarg);
if (minimum_perc < 0 || minimum_perc > 100) {
fprintf(stderr, "error: cut-off percentage "
"makes no sense: %g\n", minimum_perc);
exit(1);
}
break;
case 's':
/* source tree directory specified */
src_path = optarg;
break;
default: usage(argv[0]);
}
}
/* load samples */
if (optind >= argc) usage(argv[0]);
for (; optind < argc; optind++) {
load_trace(argv[optind]);
}
/* print report */
if (sprofdiff) {
print_diff();
} else {
print_report();
}
return 0;
}
static struct binary_info *binary_add(const char *path) {
struct binary_info *binary, **ptr;
const char *name;
/* assumption: path won't be overwritten or deallocated in the future */
/* not too much effort escaping for popen, prevent problems here */
assert(path);
if (strchr(path, '"')) {
fprintf(stderr, "error: path \"%s\" contains a quote\n", path);
exit(1);
}
/* get filename */
name = binary_name(path);
dprintf("adding binary \"%s\" with name \"%.*s\"\n",
path, PROC_NAME_LEN, name);
if (strlen(name) == 0) {
fprintf(stderr, "error: path \"%s\" does not "
"contain a filename\n", path);
exit(1);
}
/* check in hashtable whether this entry is indeed new */
ptr = binary_hashtab_get_ptr(name);
if (*ptr) {
fprintf(stderr, "warning: ignoring \"%s\" because \"%s\" was "
"previously specified\n", path, (*ptr)->path);
return *ptr;
}
dprintf("using %.*s from \"%s\"\n", PROC_NAME_LEN, name, path);
/* allocate new binary_info */
binary = MALLOC_CHECKED(struct binary_info, 1);
memset(binary, 0, sizeof(struct binary_info));
binary->path = path;
strncpy(binary->name, name, sizeof(binary->name));
/* insert into linked list */
binary->next = binaries;
binaries = binary;
/* insert into hashtable */
*ptr = binary;
return binary;
}
static struct binary_info *binary_find(const char *name) {
struct binary_info *binary;
const char *current_name;
unsigned i;
char path[PATH_MAX + 1], *path_end;
assert(name);
/* name is required */
if (!*name) {
fprintf(stderr, "warning: binary unspecified in sample\n");
return NULL;
}
/* do we already know this binary? */
binary = binary_hashtab_get(name);
if (binary) return binary;
/* search for it */
dprintf("searching for binary \"%.*s\" in \"%s\"\n",
PROC_NAME_LEN, name, src_path);
for (i = 0; i < LENGTHOF(default_binaries); i++) {
snprintf(path, sizeof(path), "%s/%s", src_path,
default_binaries[i]);
current_name = binary_name(path);
assert(current_name);
if (*current_name) {
/* paths not ending in slash: use if name matches */
if (strncmp(name, current_name,
PROC_NAME_LEN) != 0) {
continue;
}
} else {
/* paths ending in slash: look in subdir named after
* binary
*/
path_end = path + strlen(path);
snprintf(path_end, sizeof(path) - (path_end - path),
"%.*s/%.*s", PROC_NAME_LEN, name,
PROC_NAME_LEN, name);
}
/* use access to find out whether the binary exists and is
* readable
*/
dprintf("checking whether \"%s\" exists\n", path);
if (access(path, R_OK) < 0) continue;
/* ok, this seems to be the one */
return binary_add(strdup_checked(path));
}
/* not found */
return NULL;
}
static struct binary_info *binary_hashtab_get(const char *name) {
return *binary_hashtab_get_ptr(name);
}
static struct binary_info **binary_hashtab_get_ptr(const char *name) {
struct binary_info *binary, **ptr;
/* get pointer to location of the binary in hash table */
ptr = &binary_hashtab[name_hash(name) % BINARY_HASHTAB_SIZE];
while ((binary = *ptr) && strncmp(binary->name, name,
PROC_NAME_LEN) != 0) {
ptr = &binary->hashtab_next;
}
dprintf("looked up binary \"%.*s\" in hash table, %sfound\n",
PROC_NAME_LEN, name, *ptr ? "" : "not ");
return ptr;
}
static void binary_load_pc_map(struct binary_info *binary_info) {
unsigned long addr, size;
char *command;
size_t command_len;
#if DEBUG
unsigned count = 0;
#endif
FILE *file;
int index_l1, index_l2, line;
char name[SYMBOL_NAME_SIZE];
struct pc_map_l2 *pc_map_l2, **pc_map_l2_ptr;
struct symbol_count *symbol, **symbol_ptr;
char type;
assert(binary_info);
assert(!strchr(NM, '"'));
assert(!strchr(binary_info->path, '"'));
/* does the file exist? */
if (access(binary_info->path, R_OK) < 0) {
fprintf(stderr, "warning: \"%s\" does not exist or "
"not readable.\n", binary_info->path);
fprintf(stderr, " Did you do a make?\n");
return;
}
/* execute nm to get symbols */
command_len = strlen(NM) + strlen(binary_info->path) + 32;
command = MALLOC_CHECKED(char, command_len);
snprintf(command, command_len, "\"%s\" -nP \"%s\"",
NM, binary_info->path);
dprintf("running command for extracting addresses: %s\n", command);
file = popen(command, "r");
if (!file) {
perror("failed to start " NM);
exit(-1);
}
free(command);
/* read symbols from nm output */
assert(!binary_info->symbols);
symbol_ptr = &binary_info->symbols;
line = 1;
while (!feof(file)) {
/* read nm output line; can't use fscanf as it doesn't know
* where to stop
*/
read_nm_line(file, line++, name, &type, &addr, &size);
/* store only text symbols */
if (type != 't' && type != 'T') continue;
*symbol_ptr = symbol = MALLOC_CHECKED(struct symbol_count, 1);
memset(symbol, 0, sizeof(*symbol));
symbol->binary = binary_info;
symbol->addr = addr;
strncpy(symbol->name, name, SYMBOL_NAME_SIZE);
symbol_ptr = &symbol->next;
#if DEBUG
count++;
#endif
}
fclose(file);
dprintf("extracted %u symbols\n", count);
/* create program counter map from symbols */
assert(!binary_info->pc_map);
binary_info->pc_map = MALLOC_CHECKED(struct pc_map_l1, 1);
memset(binary_info->pc_map, 0, sizeof(struct pc_map_l1));
for (symbol = binary_info->symbols; symbol; symbol = symbol->next) {
/* compute size if not specified */
size = symbol->next ? (symbol->next->addr - symbol->addr) : 1;
if (size > SYMBOL_SIZE_MAX) size = SYMBOL_SIZE_MAX;
/* mark each address */
for (addr = symbol->addr; addr - symbol->addr < size; addr++) {
index_l1 = addr / PC_MAP_L2_SIZE;
assert(index_l1 < PC_MAP_L1_SIZE);
pc_map_l2_ptr = &binary_info->pc_map->l1[index_l1];
if (!(pc_map_l2 = *pc_map_l2_ptr)) {
*pc_map_l2_ptr = pc_map_l2 =
MALLOC_CHECKED(struct pc_map_l2, 1);
memset(pc_map_l2, 0, sizeof(struct pc_map_l2));
}
index_l2 = addr % PC_MAP_L2_SIZE;
pc_map_l2->l2[index_l2] = symbol;
}
}
}
static const char *binary_name(const char *path) {
const char *name, *p;
/* much like basename, but guarantees to not modify the path */
name = path;
for (p = path; *p; p++) {
if (*p == '/') name = p + 1;
}
return name;
}
static int compare_binaries(const void *p1, const void *p2) {
const struct binary_info *const *b1 = p1, *const *b2 = p2;
/* binaries with more samples come first */
assert(b1);
assert(b2);
assert(*b1);
assert(*b2);
if ((*b1)->samples > (*b2)->samples) return -1;
if ((*b1)->samples < (*b2)->samples) return 1;
return 0;
}
static int compare_symbols(const void *p1, const void *p2) {
const struct symbol_count *const *s1 = p1, *const *s2 = p2;
/* symbols with more samples come first */
assert(s1);
assert(s2);
assert(*s1);
assert(*s2);
if ((*s1)->samples > (*s2)->samples) return -1;
if ((*s1)->samples < (*s2)->samples) return 1;
return 0;
}
static int count_symbols(const struct binary_info *binary, int threshold) {
struct symbol_count *symbol;
int result = 0;
for (symbol = binary->symbols; symbol; symbol = symbol->next) {
if (symbol->samples >= threshold) result++;
}
return result;
}
static void dprint_symbols(const struct binary_info *binary) {
#if DEBUG
const struct symbol_count *symbol;
for (symbol = binary->symbols; symbol; symbol = symbol->next) {
dprintf("addr=0x%.8lx samples=%8d name=\"%.*s\"\n",
(unsigned long) symbol->addr, symbol->samples,
SYMBOL_NAME_SIZE, symbol->name);
}
#endif
}
static struct endpoint_info **endpoint_hashtab_get_ptr(endpoint_t endpoint) {
struct endpoint_info *epinfo, **ptr;
/* get pointer to location of the binary in hash table */
ptr = &endpoint_hashtab[(unsigned) endpoint % ENDPOINT_HASHTAB_SIZE];
while ((epinfo = *ptr) && epinfo->endpoint != endpoint) {
ptr = &epinfo->hashtab_next;
}
dprintf("looked up endpoint %ld in hash table, %sfound\n",
(long) endpoint, *ptr ? "" : "not ");
return ptr;
}
static void load_trace(const char *path) {
char buffer[1024];
size_t bufindex, bufsize;
FILE *file;
unsigned size_info, size_sample, size_proc;
int samples_read;
/* open trace file */
file = fopen(path, "rb");
if (!file) {
fprintf(stderr, "error: cannot open trace file \"%s\": %s\n",
path, strerror(errno));
exit(1);
}
/* check file format and update totals */
if (fscanf(file, "stat\n%u %u %u\n",
&size_info, &size_sample, &size_proc) != 3) {
fprintf(stderr, "error: file \"%s\" does not contain an "
"sprofile trace\n", path);
exit(1);
}
if ((size_info != sizeof(struct sprof_info_s)) ||
(size_sample != sizeof(struct sprof_sample)) ||
(size_proc != sizeof(struct sprof_proc))) {
fprintf(stderr, "error: file \"%s\" is incompatible with this "
"version of sprofalyze; recompile sprofalyze with the "
"MINIX version that created this file\n", path);
exit(1);
}
if (fread(&sprof_info, sizeof(sprof_info), 1, file) != 1) {
fprintf(stderr, "error: totals missing in file \"%s\"\n", path);
exit(1);
}
/* read and store samples */
samples_read = 0;
bufindex = 0;
bufsize = 0;
for (;;) {
/* enough left in the buffer? */
if (bufsize - bufindex < sizeof(union sprof_record)) {
/* not enough, read some more */
memmove(buffer, buffer + bufindex, bufsize - bufindex);
bufsize -= bufindex;
bufindex = 0;
bufsize += fread(buffer + bufsize, 1,
sizeof(buffer) - bufsize, file);
/* are we done? */
if (bufsize == 0) break;
}
/* process sample record (either struct sprof_sample or
* struct sprof_proc)
*/
bufindex += sample_process(
(const union sprof_record *) (buffer + bufindex),
bufsize - bufindex, &samples_read);
}
if (samples_read != sprof_info.system_samples) {
fprintf(stderr, "warning: number of system samples (%d) in "
"\"%s\" does not match number of records (%d)\n",
sprof_info.system_samples, path, samples_read);
}
fclose(file);
}
static void *malloc_checked(size_t size) {
void *p;
if (!size) return NULL;
p = malloc(size);
if (!p) {
fprintf(stderr, "error: malloc cannot allocate %lu bytes: %s\n",
(unsigned long) size, strerror(errno));
exit(-1);
}
return p;
}
static unsigned name_hash(const char *name) {
int i;
unsigned r = 0;
/* remember: strncpy initializes all bytes */
for (i = 0; i < PROC_NAME_LEN && name[i]; i++) {
r = r * 31 + name[i];
}
dprintf("name_hash(\"%.*s\") = 0x%.8x\n", PROC_NAME_LEN, name, r);
return r;
}
static float percent(int value, int percent_of) {
assert(value >= 0);
assert(value <= percent_of);
return (percent_of > 0) ? (value * 100.0 / percent_of) : 0;
}
static void print_diff(void) {
const struct binary_info *binary;
int binary_samples;
const struct symbol_count *symbol;
/* print out aggregates in a machine-readable format for sprofdiff */
printf("(total)\t\t%d\n", sprof_info.total_samples);
printf("(system)\t\t%d\n", sprof_info.system_samples);
printf("(idle)\t\t%d\n", sprof_info.idle_samples);
printf("(user)\t\t%d\n", sprof_info.user_samples);
for (binary = binaries; binary; binary = binary->next) {
binary_samples = 0;
for (symbol = binary->symbols; symbol; symbol = symbol->next) {
if (symbol->samples) {
printf("%.*s\t%.*s\t%d\n",
PROC_NAME_LEN, binary->name,
SYMBOL_NAME_SIZE, symbol->name,
symbol->samples);
}
binary_samples += symbol->samples;
}
printf("%.*s\t(total)\t%d\n",
PROC_NAME_LEN, binary->name,
binary_samples);
}
}
static void print_report(void) {
/* print out human-readable analysis */
printf("Showing processes and functions using at least %3.0f%% "
"time.\n\n", minimum_perc);
printf(" System process ticks: %10d (%3.0f%%)\n",
sprof_info.system_samples, percent(sprof_info.system_samples, sprof_info.total_samples));
printf(" User process ticks: %10d (%3.0f%%) "
"Details of system process\n",
sprof_info.user_samples, percent(sprof_info.user_samples, sprof_info.total_samples));
printf(" Idle time ticks: %10d (%3.0f%%) "
"samples, aggregated and\n",
sprof_info.idle_samples, percent(sprof_info.idle_samples, sprof_info.total_samples));
printf(" ---------- ---- "
"per process, are below.\n");
printf(" Total ticks: %10d (100%%)\n\n", sprof_info.total_samples);
print_report_overall();
print_reports_per_binary();
}
static void print_report_overall(void) {
struct binary_info *binary;
struct symbol_count *symbol, **symbols_sorted;
unsigned index, symbol_count;
int sample_threshold;
/* count number of symbols to display */
sample_threshold = sprof_info.system_samples * minimum_perc / 100;
symbol_count = 0;
for (binary = binaries; binary; binary = binary->next) {
symbol_count += count_symbols(binary, sample_threshold);
}
/* sort symbols by decreasing number of samples */
symbols_sorted = MALLOC_CHECKED(struct symbol_count *, symbol_count);
index = 0;
for (binary = binaries; binary; binary = binary->next) {
for (symbol = binary->symbols; symbol; symbol = symbol->next) {
if (symbol->samples >= sample_threshold) {
symbols_sorted[index++] = symbol;
}
}
}
assert(index == symbol_count);
qsort(symbols_sorted, symbol_count, sizeof(symbols_sorted[0]),
compare_symbols);
/* report most common symbols overall */
print_separator();
printf("Total system process time %*d samples\n",
LINE_WIDTH - 34, sprof_info.system_samples);
print_separator();
print_report_symbols(symbols_sorted, symbol_count, sprof_info.system_samples, 1);
free(symbols_sorted);
}
static void print_report_per_binary(const struct binary_info *binary) {
struct symbol_count *symbol, **symbols_sorted;
unsigned index, symbol_count;
int sample_threshold;
/* count number of symbols to display */
sample_threshold = binary->samples * minimum_perc / 100;
symbol_count = count_symbols(binary, sample_threshold);
/* sort symbols by decreasing number of samples */
symbols_sorted = MALLOC_CHECKED(struct symbol_count *, symbol_count);
index = 0;
for (symbol = binary->symbols; symbol; symbol = symbol->next) {
if (symbol->samples >= sample_threshold) {
symbols_sorted[index++] = symbol;
}
}
assert(index == symbol_count);
qsort(symbols_sorted, symbol_count, sizeof(symbols_sorted[0]),
compare_symbols);
/* report most common symbols for this binary */
print_separator();
printf("%-*.*s %4.1f%% of system process samples\n",
LINE_WIDTH - 32, PROC_NAME_LEN, binary->name,
percent(binary->samples, sprof_info.system_samples));
print_separator();
print_report_symbols(symbols_sorted, symbol_count, binary->samples, 0);
free(symbols_sorted);
}
static void print_reports_per_binary(void) {
struct binary_info *binary, **binaries_sorted;
unsigned binary_count, i, index;
int sample_threshold, samples_shown;
struct symbol_count *symbol;
/* count total per-binary samples */
binary_count = 0;
for (binary = binaries; binary; binary = binary->next) {
assert(!binary->samples);
for (symbol = binary->symbols; symbol; symbol = symbol->next) {
binary->samples += symbol->samples;
}
binary_count++;
}
/* sort binaries by decreasing number of samples */
binaries_sorted = MALLOC_CHECKED(struct binary_info *, binary_count);
index = 0;
for (binary = binaries; binary; binary = binary->next) {
binaries_sorted[index++] = binary;
}
assert(index == binary_count);
qsort(binaries_sorted, binary_count, sizeof(binaries_sorted[0]),
compare_binaries);
/* display reports for binaries with enough samples */
sample_threshold = sprof_info.system_samples * minimum_perc / 100;
samples_shown = 0;
for (i = 0; i < binary_count; i++) {
if (binaries_sorted[i]->samples < sample_threshold) break;
print_report_per_binary(binaries_sorted[i]);
samples_shown += binaries_sorted[i]->samples;
}
print_separator();
printf("processes <%3.0f%% (not showing functions) %*.1f%% of system "
"process samples\n", minimum_perc, LINE_WIDTH - 67,
percent(sprof_info.system_samples - samples_shown, sprof_info.system_samples));
print_separator();
free(binaries_sorted);
}
static void print_report_symbols(struct symbol_count **symbols,
unsigned symbol_count, int total, int show_process) {
unsigned bar_dots, bar_width, i, j, process_width;
int samples, samples_shown;
struct symbol_count *symbol;
/* find out how much space we have available */
process_width = show_process ? (PROC_NAME_LEN + 1) : 0;
bar_width = LINE_WIDTH - process_width - SYMBOL_NAME_WIDTH - 17;
/* print the symbol lines */
samples_shown = 0;
for (i = 0; i <= symbol_count; i++) {
if (i < symbol_count) {
/* first list the symbols themselves */
symbol = symbols[i];
printf("%*.*s %*.*s ",
process_width,
show_process ? PROC_NAME_LEN : 0,
symbol->binary->name,
SYMBOL_NAME_WIDTH,
SYMBOL_NAME_WIDTH,
symbol->name);
samples = symbol->samples;
} else {
/* at the end, list the remainder */
printf("%*s<%3.0f%% ",
process_width + SYMBOL_NAME_WIDTH - 4,
"",
minimum_perc);
samples = total - samples_shown;
}
assert(samples >= 0);
assert(samples <= total);
bar_dots = (total > 0) ? (samples * bar_width / total) : 0;
for (j = 0; j < bar_dots; j++) printf("*");
for (; j < bar_width; j++) printf(" ");
printf("%8d %5.1f%%\n", samples, percent(samples, total));
samples_shown += samples;
}
/* print remainder and summary */
print_separator();
printf("%-*.*s%*d 100.0%%\n\n", PROC_NAME_LEN, PROC_NAME_LEN,
(show_process || symbol_count == 0) ?
"total" : symbols[0]->binary->name,
LINE_WIDTH - PROC_NAME_LEN - 7, total);
}
static void print_separator(void) {
int i;
for (i = 0; i < LINE_WIDTH; i++) printf("-");
printf("\n");
}
static int read_hex(FILE *file, unsigned long *value) {
int c, cvalue;
unsigned index;
assert(file);
assert(value);
index = 0;
c = fgetc(file);
*value = 0;
while (index < 8) {
if (c >= '0' && c <= '9') {
cvalue = c - '0';
} else if (c >= 'A' && c <= 'F') {
cvalue = c - 'A' + 10;
} else if (c >= 'a' && c <= 'f') {
cvalue = c - 'a' + 10;
} else {
break;
}
*value = *value * 16 + cvalue;
index++;
c = fgetc(file);
}
if (c != EOF) ungetc(c, file);
return index;
}
static int read_newline(FILE *file) {
int c;
do {
c = fgetc(file);
} while (c != EOF && c != '\n' && isspace(c));
if (c == EOF || c == '\n') return 1;
ungetc(c, file);
return 0;
}
static void read_nm_line(FILE *file, int line, char *name, char *type,
unsigned long *addr, unsigned long *size) {
assert(file);
assert(name);
assert(type);
assert(addr);
assert(size);
*type = 0;
*addr = 0;
*size = 0;
if (read_newline(file)) {
memset(name, 0, SYMBOL_NAME_SIZE);
return;
}
/* name and type are compulsory */
read_to_whitespace(file, name, SYMBOL_NAME_SIZE);
if (read_newline(file)) {
fprintf(stderr, "error: bad output format from nm: "
"symbol type missing on line %d\n", line);
exit(-1);
}
*type = fgetc(file);
/* address is optional */
if (read_newline(file)) return;
if (!read_hex(file, addr)) {
fprintf(stderr, "error: bad output format from nm: junk where "
"address should be on line %d\n", line);
exit(-1);
}
/* size is optional */
if (read_newline(file)) return;
if (!read_hex(file, size)) {
fprintf(stderr, "error: bad output format from nm: junk where "
"size should be on line %d\n", line);
exit(-1);
}
/* nothing else expected */
if (read_newline(file)) return;
fprintf(stderr, "error: bad output format from nm: junk after size "
"on line %d\n", line);
exit(-1);
}
static void read_to_whitespace(FILE *file, char *buffer, size_t size) {
int c;
/* read up to and incl first whitespace, store at most size chars */
while ((c = fgetc(file)) != EOF && !isspace(c)) {
if (size > 0) {
*(buffer++) = c;
size--;
}
}
if (size > 0) *buffer = 0;
}
static size_t sample_process(const union sprof_record *data, size_t size,
int *samples_read) {
struct endpoint_info *epinfo, **ptr;
assert(data);
assert(samples_read);
/* do we have a proper sample? */
if (size < sizeof(data->proc) && size < sizeof(data->sample)) {
goto error;
}
/* do we know this endpoint? */
ptr = endpoint_hashtab_get_ptr(data->proc.proc);
if ((epinfo = *ptr)) {
/* endpoint known, store sample */
if (size < sizeof(data->sample)) goto error;
sample_store(epinfo->binary, &data->sample);
(*samples_read)++;
return sizeof(data->sample);
}
/* endpoint not known, add it */
*ptr = epinfo = MALLOC_CHECKED(struct endpoint_info, 1);
memset(epinfo, 0, sizeof(struct endpoint_info));
epinfo->endpoint = data->proc.proc;
/* fetch binary based on process name in sample */
if (size < sizeof(data->proc)) goto error;
epinfo->binary = sample_load_binary(&data->proc);
return sizeof(data->proc);
error:
fprintf(stderr, "warning: partial sample at end of trace, "
"was the trace file truncated?\n");
return size;
}
static struct binary_info *sample_load_binary(
const struct sprof_proc *sample) {
struct binary_info *binary;
/* locate binary */
binary = binary_find(sample->name);
if (!binary) {
fprintf(stderr, "warning: ignoring unknown binary \"%.*s\"\n",
PROC_NAME_LEN, sample->name);
fprintf(stderr, " did you include this executable in "
"the configuration?\n");
fprintf(stderr, " (use -b to add additional "
"binaries)\n");
return NULL;
}
/* load symbols if this hasn't been done yet */
if (!binary->pc_map) binary_load_pc_map(binary);
return binary;
}
static void sample_store(struct binary_info *binary,
const struct sprof_sample *sample) {
unsigned long index_l1;
struct pc_map_l2 *pc_map_l2;
struct symbol_count *symbol;
if (!binary || !binary->pc_map) return;
/* find the applicable symbol (two-level lookup) */
index_l1 = (unsigned long) sample->pc / PC_MAP_L2_SIZE;
assert(index_l1 < PC_MAP_L1_SIZE);
pc_map_l2 = binary->pc_map->l1[index_l1];
if (pc_map_l2) {
symbol = pc_map_l2->l2[(unsigned long) sample->pc % PC_MAP_L2_SIZE];
} else {
symbol = NULL;
}
if (symbol) {
symbol->samples++;
} else if (!binary->no_more_warnings) {
fprintf(stderr, "warning: address 0x%lx not associated with a "
"symbol\n", (unsigned long) sample->pc);
fprintf(stderr, " binary may not match the profiled "
"version\n");
fprintf(stderr, " path: \"%s\"\n", binary->path);
binary->no_more_warnings = 1;
dprint_symbols(binary);
}
}
static char *strdup_checked(const char *s) {
char *p;
if (!s) return NULL;
p = strdup(s);
if (!p) {
fprintf(stderr, "error: strdup failed: %s\n",
strerror(errno));
exit(-1);
}
return p;
}
static void usage(const char *argv0) {
printf("usage:\n");
printf(" %s [-d] [-p percentage] [-s src-tree-path] "
"[-b binary]... file...\n", argv0);
printf("\n");
printf("sprofalyze aggregates one or more sprofile traces and");
printf("reports where time was spent.\n");
printf("\n");
printf("arguments:\n");
printf("-d generates output that can be compared using sprofdiff\n");
printf("-p specifies the cut-off percentage below which binaries\n");
printf(" and functions will not be displayed\n");
printf("-s specifies the root of the source tree where sprofalyze\n");
printf(" should search for unstripped binaries to extract symbols\n");
printf(" from\n");
printf("-b specifies an additional system binary in the trace that\n");
printf(" is not in the source tree; may be specified multiple\n");
printf(" times\n");
exit(1);
}