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continued block profiling

    1: /* VM profiling support stuff
    2: 
    3:   Copyright (C) 2001 Free Software Foundation, Inc.
    4: 
    5:   This file is part of Gforth.
    6: 
    7:   Gforth is free software; you can redistribute it and/or
    8:   modify it under the terms of the GNU General Public License
    9:   as published by the Free Software Foundation; either version 2
   10:   of the License, or (at your option) any later version.
   11: 
   12:   This program is distributed in the hope that it will be useful,
   13:   but WITHOUT ANY WARRANTY; without even the implied warranty of
   14:   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15:   GNU General Public License for more details.
   16: 
   17:   You should have received a copy of the GNU General Public License
   18:   along with this program; if not, write to the Free Software
   19:   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
   20: */
   21: 
   22: #include "config.h"
   23: #include <stdlib.h>
   24: #include <stdio.h>
   25: #include <assert.h>
   26: #include "forth.h"
   27: 
   28: 
   29: /* data structure: simple hash table with external chaining */
   30: 
   31: #define HASH_SIZE (1<<20)
   32: 
   33: typedef struct block_count {
   34:   struct block_count *next; /* next in hash table */
   35:   struct block_count *fallthrough; /* the block that this one falls
   36:                                        through to without SUPER_END */
   37:   Xt *ip;
   38:   long long count;
   39:   char **insts;
   40:   size_t ninsts;
   41: } block_count;
   42: 
   43: block_count *blocks[HASH_SIZE];
   44: 
   45: #define hash(p) ((((Cell)(p))/sizeof(Xt))&(HASH_SIZE-1))
   46: 
   47: block_count *block_lookup(Xt *ip)
   48: {
   49:   block_count *b = blocks[hash(ip)];
   50: 
   51:   while (b!=NULL && b->ip!=ip)
   52:     b = b->next;
   53:   return b;
   54: }
   55: 
   56: /* looks up present elements, inserts absent elements */
   57: block_count *block_insert(Xt *ip)
   58: { 
   59:   block_count *b = block_lookup(ip);
   60:   block_count *new;
   61: 
   62:   if (b != NULL)
   63:     return b;
   64:   new = (block_count *)malloc(sizeof(block_count));
   65:   new->next = blocks[hash(ip)];
   66:   new->fallthrough = NULL;
   67:   new->ip = ip;
   68:   new->count = 0LL;
   69:   new->insts = malloc(0);
   70:   assert(new->insts != NULL);
   71:   new->ninsts = 0;
   72:   blocks[hash(ip)] = new;
   73:   return new;
   74: }
   75: 
   76: void add_inst(block_count *b, char *inst)
   77: {
   78:   b->insts = realloc(b->insts, (b->ninsts+1) * sizeof(char *));
   79:   b->insts[b->ninsts++] = inst;
   80: }
   81: 
   82: void vm_count_block(Xt *ip)
   83: {
   84:   block_insert(ip)->count++;
   85: }
   86: 
   87: #ifdef DIRECT_THREADED
   88: #define VM_IS_INST(inst, n) ((inst) == vm_prims[(n)+DOESJUMP+1])
   89: #else
   90: #define VM_IS_INST(inst, n) ((inst) == &(vm_prims[(n)+DOESJUMP+1]))
   91: #endif
   92: 
   93: void postprocess_block(block_count *b)
   94: {
   95:   Xt *ip = b->ip;
   96:   block_count *next_block;
   97: 
   98:   do {
   99: #include "profile.i"
  100:     /* else */
  101:     {
  102:       add_inst(b,"unknown");
  103:       ip++;
  104:     }
  105:     next_block = block_lookup(ip);
  106:   } while (next_block == NULL);
  107:   /* we fell through, so set fallthrough and update the count */
  108:   b->fallthrough = next_block;
  109:   /* also update the counts of all following fallthrough blocks that
  110:      have already been processed */
  111:   while (next_block != NULL) {
  112:     next_block->count += b->count;
  113:     next_block = next_block->fallthrough;
  114:   }
  115: }
  116: 
  117: /* Deal with block entry by falling through from non-SUPER_END
  118:    instructions.  And fill the insts and ninsts fields. */
  119: void postprocess(void)
  120: {
  121:   size_t i;
  122: 
  123:   for (i=0; i<HASH_SIZE; i++) {
  124:     block_count *b = blocks[i];
  125:     for (; b!=0; b = b->next)
  126:       postprocess_block(b);
  127:    }
  128: }
  129: 
  130: void print_block(FILE *file, block_count *b)
  131: {
  132:   size_t i;
  133: 
  134:   fprintf(file,"%14lld\t",b->count);
  135:   for (i=0; i<b->ninsts; i++)
  136:     fprintf(file, "%s ", b->insts[i]);
  137:   putc('\n', file);
  138: }
  139: 
  140: void vm_print_profile(FILE *file)
  141: {
  142:   size_t i;
  143: 
  144:   postprocess();
  145:   for (i=0; i<HASH_SIZE; i++) {
  146:     block_count *b = blocks[i];
  147:     for (; b!=0; b = b->next)
  148:       print_block(file, b);
  149:    }
  150: }