prof.c

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#include "c.h"


struct callsite {
    char *file, *name;
    union coordinate {
        unsigned int coord;
        struct { unsigned int y:16,x:10,index:6; } le;
        struct { unsigned int index:6,x:10,y:16; } be;
    } u;
};
struct func {
    struct func *link;
    struct caller *callers;
    char *name;
    union coordinate src;
};
struct map {        /* source code map; 200 coordinates/map */
    int size;
    union coordinate u[200];
};

int npoints;        /* # of execution points if -b specified */
int ncalled = -1;   /* #times prof.out says current function was called */
static Symbol YYlink;   /* symbol for file's struct _bbdata */
static Symbol YYcounts; /* symbol for _YYcounts if -b specified */
static List maplist;    /* list of struct map *'s */
static List filelist;   /* list of file names */
static Symbol funclist; /* list of struct func *'s */
static Symbol afunc;    /* current function's struct func */

/* bbcall - build tree to set _callsite at call site *cp, emit call site data */
static void bbcall(Symbol yycounts, Coordinate *cp, Tree *e) {
    static Symbol caller;
    Value v;
    union coordinate u;
    Symbol p = genident(STATIC, array(voidptype, 0, 0), GLOBAL);
    Tree t = *e;

    defglobal(p, LIT);
    defpointer(cp->file ? mkstr(cp->file)->u.c.loc : (Symbol)0);
    defpointer(mkstr(cfunc->name)->u.c.loc);
    if (IR->little_endian) {
        u.le.x = cp->x;
        u.le.y = cp->y;
    } else {
        u.be.x = cp->x;
        u.be.y = cp->y;
    }
    (*IR->defconst)(U, unsignedtype->size, (v.u = u.coord, v));
    if (caller == 0) {
        caller = mksymbol(EXTERN, "_caller", ptr(voidptype));
        caller->defined = 0;
    }
    if (generic((*e)->op) != CALL)
        t = (*e)->kids[0];
    assert(generic(t->op) == CALL);
    t = tree(t->op, t->type,
        tree(RIGHT, t->kids[0]->type,
            t->kids[0],
            tree(RIGHT, t->kids[0]->type, asgn(caller, idtree(p)), t->kids[0])),
        t->kids[1]);
    if (generic((*e)->op) != CALL)
        t = tree((*e)->op, (*e)->type, t, (*e)->kids[1]);
    *e = t;
}

/* bbentry - return tree for _prologue(&afunc, &YYlink)' */
static void bbentry(Symbol yylink, Symbol f) {
    static Symbol prologue;
    
    afunc = genident(STATIC, array(voidptype, 4, 0), GLOBAL);
    if (prologue == 0) {
        prologue = mksymbol(EXTERN, "_prologue", ftype(inttype, voidptype));
        prologue->defined = 0;
    }
    walk(vcall(prologue, voidtype, pointer(idtree(afunc)), pointer(idtree(yylink)), NULL), 0, 0);

}

/* bbexit - return tree for _epilogue(&afunc)' */
static void bbexit(Symbol yylink, Symbol f, Tree e) {
    static Symbol epilogue;
    
    if (epilogue == 0) {
        epilogue = mksymbol(EXTERN, "_epilogue", ftype(inttype, voidptype));
        epilogue->defined = 0;
    }
    walk(vcall(epilogue, voidtype, pointer(idtree(afunc)), NULL), 0, 0);
}

/* bbfile - add file to list of file names, return its index */
static int bbfile(char *file) {
    if (file) {
        List lp;
        int i = 1;
        if ((lp = filelist) != NULL)
            do {
                lp = lp->link;
                if (((Symbol)lp->x)->u.c.v.p == file)
                    return i;
                i++;
            } while (lp != filelist);
        filelist = append(mkstr(file), filelist);
        return i;
    }
    return 0;
}

/* bbfunc - emit function name and src coordinates */
static void bbfunc(Symbol yylink, Symbol f) {
    Value v;
    union coordinate u;

    defglobal(afunc, DATA);
    defpointer(funclist);
    defpointer(NULL);
    defpointer(mkstr(f->name)->u.c.loc);
    if (IR->little_endian) {
        u.le.x = f->u.f.pt.x;
        u.le.y = f->u.f.pt.y;
        u.le.index = bbfile(f->u.f.pt.file);
    } else {
        u.be.x = f->u.f.pt.x;
        u.be.y = f->u.f.pt.y;
        u.be.index = bbfile(f->u.f.pt.file);
    }
    (*IR->defconst)(U, unsignedtype->size, (v.u = u.coord, v));
    funclist = afunc;
}

/* bbincr - build tree to increment execution point at *cp */
static void bbincr(Symbol yycounts, Coordinate *cp, Tree *e) {
    struct map *mp = maplist->x;
    Tree t;

    /* append *cp to source map */
    if (mp->size >= NELEMS(mp->u)) {
        NEW(mp, PERM);
        mp->size = 0;
        maplist = append(mp, maplist);
    }
    if (IR->little_endian) {
        mp->u[mp->size].le.x = cp->x;
        mp->u[mp->size].le.y = cp->y;
        mp->u[mp->size++].le.index = bbfile(cp->file);
    } else {
        mp->u[mp->size].be.x = cp->x;
        mp->u[mp->size].be.y = cp->y;
        mp->u[mp->size++].be.index = bbfile(cp->file);
    }
    t = incr('+', rvalue((*optree['+'])(ADD, pointer(idtree(yycounts)),
        consttree(npoints++, inttype))), consttree(1, inttype));
    if (*e)
        *e = tree(RIGHT, (*e)->type, t, *e);
    else
        *e = t;
}

/* bbvars - emit definition for basic block counting data */
static void bbvars(Symbol yylink) {
    int i, j, n = npoints;
    Value v;
    struct map **mp;
    Symbol coords, files, *p;

    if (!YYcounts && !yylink)
        return;
    if (YYcounts) {
        if (n <= 0)
            n = 1;
        YYcounts->type = array(unsignedtype, n, 0);
        defglobal(YYcounts, BSS);
    }
    files = genident(STATIC, array(charptype, 1, 0), GLOBAL);
    defglobal(files, LIT);
    for (p = ltov(&filelist, PERM); *p; p++)
        defpointer((*p)->u.c.loc);
    defpointer(NULL);
    coords = genident(STATIC, array(unsignedtype, n, 0), GLOBAL);
    defglobal(coords, LIT);
    for (i = n, mp = ltov(&maplist, PERM); *mp; i -= (*mp)->size, mp++)
        for (j = 0; j < (*mp)->size; j++)
            (*IR->defconst)(U, unsignedtype->size, (v.u = (*mp)->u[j].coord, v));
    if (i > 0)
        (*IR->space)(i*coords->type->type->size);
    defpointer(NULL);
    defglobal(yylink, DATA);
    defpointer(NULL);
    (*IR->defconst)(U, unsignedtype->size, (v.u = n, v));
    defpointer(YYcounts);
    defpointer(coords);
    defpointer(files);
    defpointer(funclist);
}

/* profInit - initialize basic block profiling options */
void prof_init(int argc, char *argv[]) {
    int i;
    static int inited;

    if (inited)
        return;
    inited = 1;
    type_init(argc, argv);
    if (IR)
        for (i = 1; i < argc; i++)
            if (strncmp(argv[i], "-a", 2) == 0) {
                if (ncalled == -1
                && process(argv[i][2] ? &argv[i][2] : "prof.out") > 0)
                    ncalled = 0;
            } else if ((strcmp(argv[i], "-b") == 0
                     || strcmp(argv[i], "-C") == 0) && YYlink == 0) {
                YYlink = genident(STATIC, array(unsignedtype, 0, 0), GLOBAL);
                attach((Apply)bbentry, YYlink, &events.entry);
                attach((Apply)bbexit,  YYlink, &events.returns);
                attach((Apply)bbfunc,  YYlink, &events.exit);
                attach((Apply)bbvars,  YYlink, &events.end);
                if (strcmp(argv[i], "-b") == 0) {
                    YYcounts = genident(STATIC, array(unsignedtype, 0, 0), GLOBAL);
                    maplist = append(allocate(sizeof (struct map), PERM), maplist);
                    ((struct map *)maplist->x)->size = 0;
                    attach((Apply)bbcall, YYcounts, &events.calls);
                    attach((Apply)bbincr, YYcounts, &events.points);
                }
            }
}

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