/*
 * Analyze the profile file (cmon.out) written out by the dbug
 * routines with profiling enabled.
 *
 * Copyright June 1987, Binayak Banerjee
 * All rights reserved.
 *
 * This program may be freely distributed under the same terms and
 * conditions as Fred Fish's Dbug package.
 *
 * Compile with -- cc -O -s -o %s analyze.c
 *
 * Analyze will read an trace file created by the dbug package
 * (when run with traceing enabled).  It will then produce a
 * summary on standard output listing the name of each traced
 * function, the number of times it was called, the percentage
 * of total calls, the time spent executing the function, the
 * proportion of the total time and the 'importance'.  The last
 * is a metric which is obtained by multiplying the proportions
 * of calls and the proportions of time for each function.  The
 * greater the importance, the more likely it is that a speedup
 * could be obtained by reducing the time taken by that function.
 *
 * Note that the timing values that you obtain are only rough
 * measures.  The overhead of the dbug package is included
 * within.  However, there is no need to link in special profiled
 * libraries and the like.
 *
 * CHANGES:
 *
 *	2-Mar-89: fnf
 *	Changes to support tracking of stack usage.  This required
 *	reordering the fields in the profile log file to make
 *	parsing of different record types easier.  Corresponding
 *	changes made in dbug runtime library.  Also used this
 *	opportunity to reformat the code more to my liking (my
 *	apologies to Binayak Banerjee for "uglifying" his code).
 *
 *	24-Jul-87: fnf
 *	Because I tend to use functions names like
 *	"ExternalFunctionDoingSomething", I've rearranged the
 *	printout to put the function name last in each line, so
 *	long names don't screw up the formatting unless they are
 *	*very* long and wrap around the screen width...
 *
 *	24-Jul-87: fnf
 *	Modified to put out table very similar to Unix profiler
 *	by default, but also puts out original verbose table
 *	if invoked with -v flag.
 */

#include <my_global.h>
#include <m_string.h>
#include <my_thread.h>

static char *my_name;
static int verbose;

/*
 * Structure of the stack.
 */

#define PRO_FILE	"dbugmon.out"	/* Default output file name */
#define STACKSIZ	100		/* Maximum function nesting */
#define MAXPROCS	10000		/* Maximum number of function calls */

# ifdef BSD
#	include <sysexits.h>
# else
#	define EX_SOFTWARE 1
#	define EX_DATAERR 1
#	define EX_USAGE 1
#	define EX_OSERR 1
#	define EX_IOERR 1
#ifndef EX_OK
#	define EX_OK 0
#endif
# endif

#define __MERF_OO_ "%s: Malloc Failed in %s: %d\n"

#define MALLOC(Ptr,Num,Typ) do	/* Malloc w/error checking & exit */ \
	if (!(Ptr = (Typ *)malloc((Num)*(sizeof(Typ))))) \
		{fprintf(stderr,__MERF_OO_,my_name,__FILE__,__LINE__);\
		exit(EX_OSERR);} while(0)

#define Malloc(Ptr,Num,Typ) do	/* Weaker version of above */\
	if (!(Ptr = (Typ *)malloc((Num)*(sizeof(Typ))))) \
		fprintf(stderr,__MERF_OO_,my_name,__FILE__,__LINE__);\
		 while(0)

#define FILEOPEN(Fp,Fn,Mod) do	/* File open with error exit */ \
	if (!(Fp = fopen(Fn,Mod)))\
		{fprintf(stderr,"%s: Couldn't open %s\n",my_name,Fn);\
		exit(EX_IOERR);} while(0)

#define Fileopen(Fp,Fn,Mod) do	/* Weaker version of above */ \
	if(!(Fp = fopen(Fn,Mod))) \
		fprintf(stderr,"%s: Couldn't open %s\n",my_name,Fn);\
	while(0)


struct stack_t {
    unsigned int pos;			/* which function? */
    unsigned long time;			/* Time that this was entered */
    unsigned long children;		/* Time spent in called funcs */
};

static struct stack_t fn_stack[STACKSIZ+1];

static unsigned int stacktop = 0;	/* Lowest stack position is a dummy */

static unsigned long tot_time = 0;
static unsigned long tot_calls = 0;
static unsigned long highstack = 0;
static unsigned long lowstack = (ulong) ~0;

/*
 * top() returns a pointer to the top item on the stack.
 * (was a function, now a macro)
 */

#define top()	&fn_stack[stacktop]

/*
 * Push - Push the given record on the stack.
 */

void push (name_pos, time_entered)
unsigned int name_pos;
unsigned long time_entered;
{
    struct stack_t *t;

    DBUG_ENTER("push");
    if (++stacktop > STACKSIZ) {
	fprintf (DBUG_FILE,"%s: stack overflow (%s:%d)\n",
		my_name, __FILE__, __LINE__);
	exit (EX_SOFTWARE);
    }
    DBUG_PRINT ("push", ("%d %ld",name_pos,time_entered));
    t = &fn_stack[stacktop];
    t -> pos = name_pos;
    t -> time = time_entered;
    t -> children = 0;
    DBUG_VOID_RETURN;
}

/*
 * Pop - pop the top item off the stack, assigning the field values
 * to the arguments. Returns 0 on stack underflow, or on popping first
 * item off stack.
 */

unsigned int pop (name_pos, time_entered, child_time)
unsigned int *name_pos;
unsigned long *time_entered;
unsigned long *child_time;
{
    struct stack_t *temp;
    unsigned int rtnval;

    DBUG_ENTER ("pop");

    if (stacktop < 1) {
	rtnval = 0;
    } else {
	temp =	&fn_stack[stacktop];
	*name_pos = temp->pos;
	*time_entered = temp->time;
	*child_time = temp->children;
	DBUG_PRINT ("pop", ("%d %lu %lu",*name_pos,*time_entered,*child_time));
	rtnval = stacktop--;
    }
    DBUG_RETURN (rtnval);
}

/*
 * We keep the function info in another array (serves as a simple
 * symbol table)
 */

struct module_t {
    char *name;
    unsigned long m_time;
    unsigned long m_calls;
    unsigned long m_stkuse;
};

static struct module_t modules[MAXPROCS];

/*
 * We keep a binary search tree in order to look up function names
 * quickly (and sort them at the end.
 */

struct bnode {
    unsigned int lchild;	/* Index of left subtree */
    unsigned int rchild;	/* Index of right subtree */
    unsigned int pos;		/* Index of module_name entry */
};

static struct bnode s_table[MAXPROCS];

static unsigned int n_items = 0;	/* No. of items in the array so far */

/*
 * Need a function to allocate space for a string and squirrel it away.
 */

char *strsave (s)
char *s;
{
    char *retval;
    unsigned int len;

    DBUG_ENTER ("strsave");
    DBUG_PRINT ("strsave", ("%s",s));
    if (!s || (len = strlen (s)) == 0) {
	DBUG_RETURN (0);
    }
    MALLOC (retval, ++len, char);
    strcpy (retval, s);
    DBUG_RETURN (retval);
}

/*
 * add() - adds m_name to the table (if not already there), and returns
 * the index of its location in the table.  Checks s_table (which is a
 * binary search tree) to see whether or not it should be added.
 */

unsigned int add (m_name)
char *m_name;
{
    unsigned int ind = 0;
    int cmp;

    DBUG_ENTER ("add");
    if (n_items == 0) {		/* First item to be added */
	s_table[0].pos = ind;
	s_table[0].lchild = s_table[0].rchild = MAXPROCS;
	addit:
	modules[n_items].name = strsave (m_name);
	modules[n_items].m_time = 0;
	modules[n_items].m_calls = 0;
	modules[n_items].m_stkuse = 0;
	DBUG_RETURN (n_items++);
    }
    while ((cmp = strcmp (m_name,modules[ind].name))) {
	if (cmp < 0) {	/* In left subtree */
	    if (s_table[ind].lchild == MAXPROCS) {
		/* Add as left child */
		if (n_items >= MAXPROCS) {
		    fprintf (DBUG_FILE,
			    "%s: Too many functions being profiled\n",
			     my_name);
		    exit (EX_SOFTWARE);
		}
		s_table[n_items].pos = s_table[ind].lchild = n_items;
		s_table[n_items].lchild = s_table[n_items].rchild = MAXPROCS;
#ifdef notdef
		modules[n_items].name = strsave (m_name);
		modules[n_items].m_time = modules[n_items].m_calls = 0;
		DBUG_RETURN (n_items++);
#else
		goto addit;
#endif

	    }
	    ind = s_table[ind].lchild; /* else traverse l-tree */
	} else {
	    if (s_table[ind].rchild == MAXPROCS) {
		/* Add as right child */
		if (n_items >= MAXPROCS) {
		    fprintf (DBUG_FILE,
			     "%s: Too many functions being profiled\n",
			     my_name);
		    exit (EX_SOFTWARE);
		}
		s_table[n_items].pos = s_table[ind].rchild = n_items;
		s_table[n_items].lchild = s_table[n_items].rchild = MAXPROCS;
#ifdef notdef
		modules[n_items].name = strsave (m_name);
		modules[n_items].m_time = modules[n_items].m_calls = 0;
		DBUG_RETURN (n_items++);
#else
		goto addit;
#endif

	    }
	    ind = s_table[ind].rchild; /* else traverse r-tree */
	}
    }
    DBUG_RETURN (ind);
}

/*
 * process() - process the input file, filling in the modules table.
 */

void process (inf)
FILE *inf;
{
  char buf[BUFSIZ];
  char fn_name[64];		/* Max length of fn_name */
  unsigned long fn_time;
  unsigned long fn_sbot;
  unsigned long fn_ssz;
  unsigned long lastuse;
  unsigned int pos;
  unsigned long local_time;
  unsigned int oldpos;
  unsigned long oldtime;
  unsigned long oldchild;
  struct stack_t *t;

  DBUG_ENTER ("process");
  while (fgets (buf,BUFSIZ,inf) != NULL) {
    switch (buf[0]) {
    case 'E':
      sscanf (buf+2, "%ld %64s", &fn_time, fn_name);
      DBUG_PRINT ("erec", ("%ld %s", fn_time, fn_name));
      pos = add (fn_name);
      push (pos, fn_time);
      break;
    case 'X':
      sscanf (buf+2, "%ld %64s", &fn_time, fn_name);
      DBUG_PRINT ("xrec", ("%ld %s", fn_time, fn_name));
      pos = add (fn_name);
      /*
       * An exited function implies that all stacked
       * functions are also exited, until the matching
       * function is found on the stack.
       */
      while (pop (&oldpos, &oldtime, &oldchild)) {
	DBUG_PRINT ("popped", ("%lu %lu", oldtime, oldchild));
	local_time = fn_time - oldtime;
	t = top ();
	t -> children += local_time;
	DBUG_PRINT ("update", ("%s", modules[t -> pos].name));
	DBUG_PRINT ("update", ("%lu", t -> children));
	local_time -= oldchild;
	modules[oldpos].m_time += local_time;
	modules[oldpos].m_calls++;
	tot_time += local_time;
	tot_calls++;
	if (pos == oldpos) {
	  goto next_line;	/* Should be a break2 */
	}
      }
      /*
       * Assume that item seen started at time 0.
       * (True for function main).  But initialize
       * it so that it works the next time too.
       */
      t = top ();
      local_time = fn_time - t -> time - t -> children;
      t -> time = fn_time; t -> children = 0;
      modules[pos].m_time += local_time;
      modules[pos].m_calls++;
      tot_time += local_time;
      tot_calls++;
      break;
    case 'S':
      sscanf (buf+2, "%lx %lx %64s", &fn_sbot, &fn_ssz, fn_name);
      DBUG_PRINT ("srec", ("%lx %lx %s", fn_sbot, fn_ssz, fn_name));
      pos = add (fn_name);
      lastuse = modules[pos].m_stkuse;
#if 0
      /*
       *  Needs further thought.  Stack use is determined by
       *  difference in stack between two functions with DBUG_ENTER
       *  macros.  If A calls B calls C, where A and C have the
       *  macros, and B doesn't, then B's stack use will be lumped
       *  in with either A's or C's.  If somewhere else A calls
       *  C directly, the stack use will seem to change.  Just
       *  take the biggest for now...
       */
      if (lastuse > 0 && lastuse != fn_ssz) {
	fprintf (stderr,
		 "warning - %s stack use changed (%lx to %lx)\n",
		 fn_name, lastuse, fn_ssz);
      }
#endif
      if (fn_ssz > lastuse) {
	modules[pos].m_stkuse = fn_ssz;
      }
      if (fn_sbot > highstack) {
	highstack = fn_sbot;
      } else if (fn_sbot < lowstack) {
	lowstack = fn_sbot;
      }
      break;
    default:
      fprintf (stderr, "unknown record type '%c'\n", buf[0]);
      break;
    }
  next_line:;
  }

  /*
   * Now, we've hit eof.  If we still have stuff stacked, then we
   * assume that the user called exit, so give everything the exited
   * time of fn_time.
   */
  while (pop (&oldpos,&oldtime,&oldchild)) {
    local_time = fn_time - oldtime;
    t = top ();
    t -> children += local_time;
    local_time -= oldchild;
    modules[oldpos].m_time += local_time;
    modules[oldpos].m_calls++;
    tot_time += local_time;
    tot_calls++;
  }
  DBUG_VOID_RETURN;
}

/*
 * out_header () -- print out the header of the report.
 */

void out_header (outf)
FILE *outf;
{
    DBUG_ENTER ("out_header");
    if (verbose) {
	fprintf (outf, "Profile of Execution\n");
	fprintf (outf, "Execution times are in milliseconds\n\n");
	fprintf (outf, "    Calls\t\t\t    Time\n");
	fprintf (outf, "    -----\t\t\t    ----\n");
	fprintf (outf, "Times\tPercentage\tTime Spent\tPercentage\n");
	fprintf (outf, "Called\tof total\tin Function\tof total    Importance\tFunction\n");
	fprintf (outf, "======\t==========\t===========\t==========  ==========\t========\t\n");
    } else {
	fprintf (outf, "%ld bytes of stack used, from %lx down to %lx\n\n",
		 highstack - lowstack, highstack, lowstack);
	fprintf (outf,
		 "   %%time     sec   #call ms/call  %%calls  weight   stack  name\n");
    }
    DBUG_VOID_RETURN;
}

/*
 * out_trailer () - writes out the summary line of the report.
 */

void out_trailer (outf,sum_calls,sum_time)
FILE *outf;
unsigned long int sum_calls, sum_time;
{
    DBUG_ENTER ("out_trailer");
    if (verbose)
    {
      fprintf(outf, "======\t==========\t===========\t==========\t========\n");
      fprintf(outf, "%6ld\t%10.2f\t%11ld\t%10.2f\t\t%-15s\n",
              sum_calls, 100.0, sum_time, 100.0, "Totals");
    }
    DBUG_VOID_RETURN;
}

/*
 * out_item () - prints out the output line for a single entry,
 * and sets the calls and time fields appropriately.
 */

void out_item (outf, m,called,timed)
FILE *outf;
struct module_t *m;
unsigned long int *called, *timed;
{
    char *name = m -> name;
    unsigned int calls = m -> m_calls;
    unsigned long local_time = m -> m_time;
    unsigned long stkuse = m -> m_stkuse;
    unsigned int import;
    double per_time = 0.0;
    double per_calls = 0.0;
    double ms_per_call, local_ftime;

    DBUG_ENTER ("out_item");

    if (tot_time > 0) {
	per_time = (double) (local_time * 100) / (double) tot_time;
    }
    if (tot_calls > 0) {
	per_calls = (double) (calls * 100) / (double) tot_calls;
    }
    import = (unsigned int) (per_time * per_calls);

    if (verbose) {
	fprintf (outf, "%6d\t%10.2f\t%11ld\t%10.2f  %10d\t%-15s\n",
		calls, per_calls, local_time, per_time, import, name);
    } else {
	ms_per_call = local_time;
	ms_per_call /= calls;
	local_ftime = local_time;
	local_ftime /= 1000;
	fprintf(outf, "%8.2f%8.3f%8u%8.3f%8.2f%8u%8lu  %-s\n",
                per_time, local_ftime, calls, ms_per_call, per_calls, import,
                stkuse, name);
    }
    *called = calls;
    *timed = local_time;
    DBUG_VOID_RETURN;
}

/*
 * out_body (outf, root,s_calls,s_time) -- Performs an inorder traversal
 * on the binary search tree (root).  Calls out_item to actually print
 * the item out.
 */

void out_body (outf, root,s_calls,s_time)
FILE *outf;
unsigned int root;
unsigned long int *s_calls, *s_time;
{
    unsigned long int calls, local_time;

    DBUG_ENTER ("out_body");
    DBUG_PRINT ("out_body", ("%lu,%lu",*s_calls,*s_time));
    if (root == MAXPROCS) {
	DBUG_PRINT ("out_body", ("%lu,%lu",*s_calls,*s_time));
    } else {
	while (root != MAXPROCS) {
	    out_body (outf, s_table[root].lchild,s_calls,s_time);
	    out_item (outf, &modules[s_table[root].pos],&calls,&local_time);
	    DBUG_PRINT ("out_body", ("-- %lu -- %lu --", calls, local_time));
	    *s_calls += calls;
	    *s_time += local_time;
	    root = s_table[root].rchild;
	}
	DBUG_PRINT ("out_body", ("%lu,%lu", *s_calls, *s_time));
    }
    DBUG_VOID_RETURN;
}

/*
 * output () - print out a nice sorted output report on outf.
 */

void output (outf)
FILE *outf;
{
    unsigned long int sum_calls = 0;
    unsigned long int sum_time = 0;

    DBUG_ENTER ("output");
    if (n_items == 0) {
	fprintf (outf, "%s: No functions to trace\n", my_name);
	exit (EX_DATAERR);
    }
    out_header (outf);
    out_body (outf, 0,&sum_calls,&sum_time);
    out_trailer (outf, sum_calls,sum_time);
    DBUG_VOID_RETURN;
}


#define usage() fprintf (DBUG_FILE,"Usage: %s [-v] [prof-file]\n",my_name)

extern int optind;
extern char *optarg;

int main (int argc, char **argv)
{
    int c;
    int badflg = 0;
    FILE *infile;
    FILE *outfile = {stdout};

  my_thread_global_init(); 
  {
    DBUG_ENTER ("main");
    DBUG_PROCESS (argv[0]);
    my_name = argv[0];
    while ((c = getopt (argc,argv,"#:v")) != EOF) {
	switch (c) {
	    case '#': /* Debugging Macro enable */
		DBUG_PUSH (optarg);
		break;
	    case 'v': /* Verbose mode */
		verbose++;
		break;
	    default:
		badflg++;
		break;
	}
    }
    if (badflg) {
	usage ();
	DBUG_RETURN (EX_USAGE);
    }
    if (optind < argc) {
	FILEOPEN (infile, argv[optind], "r");
    } else {
	FILEOPEN (infile, PRO_FILE, "r");
    }
    process (infile);
    output (outfile);
    DBUG_RETURN (EX_OK);
  }
}