bprint.c

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#include <assert.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/* bprint [ -c | -Idir... | -f | -b | -n ] [ file... ]
 * annotate listings of files with prof.out data
 */


#define NDIRS (sizeof dirs/sizeof dirs[0] - 1)
#define NEW(p,a) ((p) = alloc(sizeof *(p)))
#define newarray(m,n,a) alloc((m)*(n))
#define NELEMS(a) ((int)(sizeof (a)/sizeof ((a)[0])))

#define MAXTOKEN 64

struct count {          /* count data: */
    int x, y;           /* source coordinate */
    int count;          /* associated execution count */
};

char *progname;
int number;
char *dirs[20];
int fcount;

struct file {           /* per-file prof.out data: */
    struct file *link;      /* link to next file */
    char *name;         /* file name */
    int size;           /* size of counts[] */
    int count;          /* counts[0..count-1] hold valid data */
    struct count *counts;       /* count data */
    struct func {           /* function data: */
        struct func *link;      /* link to next function */
        char *name;         /* function name */
        struct count count;     /* total number of calls */
        struct caller {     /* caller data: */
            struct caller *link;    /* link to next caller */
            char *name;     /* caller's name */
            char *file;     /* call site: file, x, y */
            int x, y;
            int count;      /* number of calls from this site */
        } *callers;
    } *funcs;           /* list of functions */
} *filelist;
FILE *fp;

extern int process(char *);
extern int findfunc(char *, char *);
extern int findcount(char *, int, int);

void *alloc(unsigned);
char *string(char *);
int process(char *);
void emitdata(char *);
void printfile(struct file *, int);
void printfuncs(struct file *, int);

/* alloc - allocate n bytes or die */
void *alloc(unsigned n) {
    void *new = malloc(n);

    assert(new);
    return new;
}

/* emitdata - write prof.out data to file */
void emitdata(char *file) {
    FILE *fp;

    if (fp = fopen(file, "w")) {
        struct file *p;
        for (p = filelist; p; p = p->link) {
            int i;
            struct func *q;
            struct caller *r;
            fprintf(fp, "1\n%s\n", p->name);
            for (i = 0, q = p->funcs; q; i++, q = q->link)
                if (r = q->callers)
                    for (i--; r; r = r->link)
                        i++;
            fprintf(fp, "%d\n", i);
            for (q = p->funcs; q; q = q->link)
                if (q->count.count == 0 || !q->callers)
                    fprintf(fp, "%s 1 %d %d %d ? ? 0 0\n", q->name, q->count.x,
                        q->count.y, q->count.count);
                else
                    for (r = q->callers; r; r = r->link)
                        fprintf(fp, "%s 1 %d %d %d %s %s %d %d\n", q->name, q->count.x,
                            q->count.y, r->count, r->name, r->file, r->x, r->y);
            fprintf(fp, "%d\n", p->count);
            for (i = 0; i < p->count; i++)
                fprintf(fp, "1 %d %d %d\n", p->counts[i].x,
                    p->counts[i].y, p->counts[i].count);
        }
        fclose(fp);
    } else
        fprintf(stderr, "%s: can't create `%s'\n", progname, file);
}

/* openfile - open name for reading, searching -I directories */
FILE *openfile(char *name) {
    int i;
    FILE *fp;

    if (*name != '/')   
        for (i = 0; dirs[i]; i++) {
            char buf[200];
            sprintf(buf, "%s/%s", dirs[i], name);
            if (fp = fopen(buf, "r"))
                return fp;
        }
    return fopen(name, "r");
}

/* printfile - print annotated listing for p */
void printfile(struct file *p, int nf) {
    int lineno;
    FILE *fp;
    char *s, buf[512];
    struct count *u = p->counts, *r, *uend;

    if (u == 0 || p->count <= 0)
        return;
    uend = &p->counts[p->count];
    if ((fp = openfile(p->name)) == NULL) {
        fprintf(stderr, "%s: can't open `%s'\n", progname, p->name);
        return;
    }
    if (nf)
        printf("%s%s:\n\n", nf == 1 ? "" : "\f", p->name);
    for (lineno = 1; fgets(buf, sizeof buf, fp); lineno++) {
        if (number)
            printf("%d\t", lineno);
        while (u < uend && u->y < lineno)
            u++;
        for (s = buf; *s; ) {
            char *t = s + 1;
            while (u < uend && u->y == lineno && u->x < s - buf)
                u++;
            if (isalnum(*s) || *s == '_')
                while (isalnum(*t) || *t == '_')
                    t++;
            while (u < uend && u->y == lineno && u->x < t - buf) {
                printf("<%d>", u->count);
                for (r = u++; u < uend && u->x == r->x && u->y == r->y && u->count == r->count; u++)
                    ;
            }
            while (s < t)
                putchar(*s++);
        }
        if (*s)
            printf("%s", s);
    }
    fclose(fp);
}

/* printfuncs - summarize data for functions in p */
void printfuncs(struct file *p, int nf) {
    struct func *q;

    if (nf)
        printf("%s:\n", p->name);
    for (q = p->funcs; q; q = q->link)
        if (fcount <= 1 || q->count.count == 0 || !q->callers)
            printf("%d\t%s\n", q->count.count, q->name);
        else {
            struct caller *r;
            for (r = q->callers; r; r = r->link)
                printf("%d\t%s\tfrom %s\tin %s:%d.%d\n", r->count, q->name, r->name,
                    r->file, r->y, r->x + 1);
        }
        
}

/* string - save a copy of str, if necessary */
char *string(char *str) {
    static struct string { struct string *link; char str[1]; } *list;
    struct string *p;

    for (p = list; p; p = p->link)
        if (strcmp(p->str, str) == 0)
            return p->str;
    p = (struct string *)alloc(strlen(str) + sizeof *p);
    strcpy(p->str, str);
    p->link = list;
    list = p;
    return p->str;
}
/* acaller - add caller and site (file,x,y) to callee's callers list */
static void acaller(char *caller, char *file, int x, int y, int count, struct func *callee) {
    struct caller *q;

    assert(callee);
    for (q = callee->callers; q && (caller != q->name
        || file != q->file || x != q->x || y != q->y); q = q->link)
        ;
    if (!q) {
        struct caller **r;
        NEW(q, PERM);
        q->name = caller;
        q->file = file;
        q->x = x;
        q->y = y;
        q->count = 0;
        for (r = &callee->callers; *r && (strcmp(q->name, (*r)->name) > 0
            || strcmp(q->file, (*r)->file) > 0 || q->y > (*r)->y || q->y > (*r)->y); r = &(*r)->link)
            ;
        q->link = *r;
        *r = q;
    }
    q->count += count;
}

/* compare - return <0, 0, >0 if a<b, a==b, a>b, resp. */
static int compare(struct count *a, struct count *b) {
    if (a->y == b->y)
        return a->x - b->x;
    return a->y - b->y;
}

/* findfile - return file name's file list entry, or 0 */
static struct file *findfile(char *name) {
    struct file *p;

    for (p = filelist; p; p = p->link)
        if (p->name == name)
            return p;
    return 0;
}

/* afunction - add function name and its data to file's function list */
static struct func *afunction(char *name, char *file, int x, int y, int count) {
    struct file *p = findfile(file);
    struct func *q;

    assert(p);
    for (q = p->funcs; q && name != q->name; q = q->link)
        ;
    if (!q) {
        struct func **r;
        NEW(q, PERM);
        q->name = name;
        q->count.x = x;
        q->count.y = y;
        q->count.count = 0;
        q->callers = 0;
        for (r = &p->funcs; *r && compare(&q->count, &(*r)->count) > 0; r = &(*r)->link)
            ;
        q->link = *r;
        *r = q;
    }
    q->count.count += count;
    return q;
}

/* apoint - append execution point i to file's data */ 
static void apoint(int i, char *file, int x, int y, int count) {
    struct file *p = findfile(file);

    assert(p);
    if (i >= p->size) {
        int j;
        if (p->size == 0) {
            p->size = i >= 200 ? 2*i : 200;
            p->counts = newarray(p->size, sizeof *p->counts, PERM);
        } else {
            struct count *new;
            p->size = 2*i;
            new = newarray(p->size, sizeof *new, PERM);
            for (j = 0; j < p->count; j++)
                new[j] = p->counts[j];
            p->counts = new;
        }
        for (j = p->count; j < p->size; j++) {
            static struct count z;
            p->counts[j] = z;
        }
    }
    p->counts[i].x = x;
    p->counts[i].y = y;
    p->counts[i].count += count;
    if (i >= p->count)
        p->count = i + 1;
}

/* findcount - return count associated with (file,x,y) or -1 */
int findcount(char *file, int x, int y) {
    static struct file *cursor;

    if (cursor == 0 || cursor->name != file)
        cursor = findfile(file);
    if (cursor) {
        int l, u;
        struct count *c = cursor->counts;
        for (l = 0, u = cursor->count - 1; l <= u; ) {
            int k = (l + u)/2;
            if (c[k].y > y || c[k].y == y && c[k].x > x)
                u = k - 1;
            else if (c[k].y < y || c[k].y == y && c[k].x < x)
                l = k + 1;
            else
                return c[k].count;
        }
    }
    return -1;
}

/* findfunc - return count associated with function name in file or -1 */
int findfunc(char *name, char *file) {
    static struct file *cursor;

    if (cursor == 0 || cursor->name != file)
        cursor = findfile(file);
    if (cursor) {
        struct func *p;
        for (p = cursor->funcs; p; p = p->link)
            if (p->name == name)
                return p->count.count;
    }
    return -1;
}

/* getd - read a nonnegative number */
static int getd(void) {
    int c, n = 0;

    while ((c = getc(fp)) != EOF && (c == ' ' || c == '\n' || c == '\t'))
        ;
    if (c >= '0' && c <= '9') {
        do
            n = 10*n + (c - '0');
        while ((c = getc(fp)) >= '0' && c <= '9');
        return n;
    }
    return -1;
}

/* getstr - read a string */
static char *getstr(void) {
    int c;
    char buf[MAXTOKEN], *s = buf;

    while ((c = getc(fp)) != EOF && c != ' ' && c != '\n' && c != '\t')
        if (s - buf < (int)sizeof buf - 2)
            *s++ = c;
    *s = 0;
    return s == buf ? (char *)0 : string(buf);
}

/* gather - read prof.out data from fd */
static int gather(void) {
    int i, nfiles, nfuncs, npoints;
    char *files[64];

    if ((nfiles = getd()) < 0)
        return 0;
    assert(nfiles < NELEMS(files));
    for (i = 0; i < nfiles; i++) {
        if ((files[i] = getstr()) == 0)
            return -1;
        if (!findfile(files[i])) {
            struct file *new;
            NEW(new, PERM);
            new->name = files[i];
            new->size = new->count = 0;
            new->counts = 0;
            new->funcs = 0;
            new->link = filelist;
            filelist = new;
        }
    }
    if ((nfuncs = getd()) < 0)
        return -1;
    for (i = 0; i < nfuncs; i++) {
        struct func *q;
        char *name, *file;
        int f, x, y, count;
        if ((name = getstr()) == 0 || (f = getd()) <= 0
        || (x = getd()) < 0 || (y = getd()) < 0 || (count = getd()) < 0)
            return -1;
        q = afunction(name, files[f-1], x, y, count);
        if ((name = getstr()) == 0 || (file = getstr()) == 0
        || (x = getd()) < 0 || (y = getd()) < 0)
            return -1;
        if (*name != '?')
            acaller(name, file, x, y, count, q);
    }
    if ((npoints = getd()) < 0)
        return -1;
    for (i = 0; i < npoints; i++) {
        int f, x, y, count;
        if ((f = getd()) < 0 || (x = getd()) < 0 || (y = getd()) < 0
        || (count = getd()) < 0)
            return -1;
        if (f)
            apoint(i, files[f-1], x, y, count);
    }
    return 1;
}

/* process - read prof.out data from file */
int process(char *file) {
    int more;

    if ((fp = fopen(file, "r")) != NULL) {
        struct file *p;
        while ((more = gather()) > 0)
            ;
        fclose(fp);
        if (more < 0)
            return more;
        for (p = filelist; p; p = p->link)
            qsort(p->counts, p->count, sizeof *p->counts,
                (int (*)(const void *, const void *))
                compare);
        
        return 1;
    }
    return 0;
}
int main(int argc, char *argv[]) {
    int i;
    struct file *p;
    void (*f)(struct file *, int) = printfile;

    progname = argv[0];
    if ((i = process("prof.out")) <= 0) {
        fprintf(stderr, "%s: can't %s `%s'\n", progname,
            i == 0 ? "open" : "interpret", "prof.out");
        exit(1);
    }
    for (i = 1; i < argc && *argv[i] == '-'; i++)
        if (strcmp(argv[i], "-c") == 0) {
            emitdata("prof.out"); 
            exit(0);
        } else if (strcmp(argv[i], "-b") == 0)
            f = printfile;
        else if (strcmp(argv[i], "-f") == 0) {
            fcount++;
            f = printfuncs;
        } else if (strcmp(argv[i], "-n") == 0)
            number++;
        else if (strncmp(argv[i], "-I", 2) == 0) {
            int j;
            for (j = 0; j < NDIRS && dirs[j]; j++)
                ;
            if (j < NDIRS)
                dirs[j] = &argv[i][2];
            else
                fprintf(stderr, "%s: too many -I options\n", progname);
        } else {
            fprintf(stderr, "usage: %s [ -c | -b | -n | -f | -Idir... ] [ file... ]\n", progname);
            exit(1);
        }
    for (p = filelist; p; p = p->link)
        qsort(p->counts, p->count, sizeof *p->counts,
            (int (*)(const void *, const void *))compare);
    if (i < argc) {
        int nf = i < argc - 1 ? 1 : 0;
        for ( ; i < argc; i++, nf ? nf++ : 0)
            if (p = findfile(string(argv[i])))
                (*f)(p, nf);
            else
                fprintf(stderr, "%s: no data for `%s'\n", progname, argv[i]);
    } else {
        int nf = filelist && filelist->link ? 1 : 0;
        for (p = filelist; p; p = p->link, nf ? nf++ : 0)
            (*f)(p, nf);
    }
    return 0;
}

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