graph.c

   1 /* Copyright © International Business Machines Corp., 2006
   2  *              Adelard LLP, 2007
   3  *
   4  * Author: Josh Triplett <josh@freedesktop.org>
   5  *         Dan Sheridan <djs@adelard.com>
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  20  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25 #include <stdarg.h>
  26 #include <stdlib.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <ctype.h>
  30 #include <unistd.h>
  31 #include <fcntl.h>
  32
  33 #include "lib.h"
  34 #include "allocate.h"
  35 #include "token.h"
  36 #include "parse.h"
  37 #include "symbol.h"
  38 #include "expression.h"
  39 #include "linearize.h"
  40
  41
  42 /* Draw the subgraph for a given entrypoint. Includes details of loads
  43  * and stores for globals, and marks return bbs */
  44 static void graph_ep(struct entrypoint *ep)
  45 {
  46         struct basic_block *bb;
  47         struct instruction *insn;
  48
  49         const char *fname, *sname;
  50
  51         fname = show_ident(ep->name->ident);
  52         sname = stream_name(ep->entry->bb->pos.stream);
  53
  54         printf("subgraph cluster%p {\n"
  55                "    color=blue;\n"
  56                "    label=<<TABLE BORDER=\"0\" CELLBORDER=\"0\">\n"
  57                "             <TR><TD>%s</TD></TR>\n"
  58                "             <TR><TD><FONT POINT-SIZE=\"21\">%s()</FONT></TD></TR>\n"
  59                "           </TABLE>>;\n"
  60                "    file=\"%s\";\n"
  61                "    fun=\"%s\";\n"
  62                "    ep=bb%p;\n",
  63                ep, sname, fname, sname, fname, ep->entry->bb);
  64
  65         FOR_EACH_PTR(ep->bbs, bb) {
  66                 struct basic_block *child;
  67                 int ret = 0;
  68                 const char * s = ", ls=\"[";
  69
  70                 /* Node for the bb */
  71                 printf("    bb%p [shape=ellipse,label=%d,line=%d,col=%d",
  72                        bb, bb->pos.line, bb->pos.line, bb->pos.pos);
  73
  74
  75                 /* List loads and stores */
  76                 FOR_EACH_PTR(bb->insns, insn) {
  77                         if (!insn->bb)
  78                                 continue;
  79                         switch(insn->opcode) {
  80                         case OP_STORE:
  81                                 if (insn->src->type == PSEUDO_SYM) {
  82                                   printf("%s store(%s)", s, show_ident(insn->src->sym->ident));
  83                                   s = ",";
  84                                 }
  85                                 break;
  86
  87                         case OP_LOAD:
  88                                 if (insn->src->type == PSEUDO_SYM) {
  89                                   printf("%s load(%s)", s, show_ident(insn->src->sym->ident));
  90                                   s = ",";
  91                                 }
  92                                 break;
  93
  94                         case OP_RET:
  95                                 ret = 1;
  96                                 break;
  97
  98                         }
  99                 } END_FOR_EACH_PTR(insn);
 100                 if (s[1] == 0)
 101                         printf("]\"");
 102                 if (ret)
 103                         printf(",op=ret");
 104                 printf("];\n");
 105
 106                 /* Edges between bbs; lower weight for upward edges */
 107                 FOR_EACH_PTR(bb->children, child) {
 108                         printf("    bb%p -> bb%p [op=br, %s];\n", bb, child,
 109                                (bb->pos.line > child->pos.line) ? "weight=5" : "weight=10");
 110                 } END_FOR_EACH_PTR(child);
 111         } END_FOR_EACH_PTR(bb);
 112
 113         printf("}\n");
 114 }
 115
 116
 117 /* Insert edges for intra- or inter-file calls, depending on the value
 118  * of internal. Bold edges are used for calls with destinations;
 119  * dashed for calls to external functions */
 120 static void graph_calls(struct entrypoint *ep, int internal)
 121 {
 122         struct basic_block *bb;
 123         struct instruction *insn;
 124
 125         show_ident(ep->name->ident);
 126         stream_name(ep->entry->bb->pos.stream);
 127
 128         FOR_EACH_PTR(ep->bbs, bb) {
 129                 if (!bb)
 130                         continue;
 131                 if (!bb->parents && !bb->children && !bb->insns && verbose < 2)
 132                         continue;
 133
 134                 FOR_EACH_PTR(bb->insns, insn) {
 135                         if (!insn->bb)
 136                                 continue;
 137                         if (insn->opcode == OP_CALL &&
 138                             internal == !(insn->func->sym->ctype.modifiers & MOD_EXTERN)) {
 139
 140                                 /* Find the symbol for the callee's definition */
 141                                 struct symbol * sym;
 142                                 if (insn->func->type == PSEUDO_SYM) {
 143                                         for (sym = insn->func->sym->ident->symbols;
 144                                              sym; sym = sym->next_id) {
 145                                                 if (sym->namespace & NS_SYMBOL && sym->ep)
 146                                                         break;
 147                                         }
 148
 149                                         if (sym)
 150                                                 printf("bb%p -> bb%p"
 151                                                        "[label=%d,line=%d,col=%d,op=call,style=bold,weight=30];\n",
 152                                                        bb, sym->ep->entry->bb,
 153                                                        insn->pos.line, insn->pos.line, insn->pos.pos);
 154                                         else
 155                                                 printf("bb%p -> \"%s\" "
 156                                                        "[label=%d,line=%d,col=%d,op=extern,style=dashed];\n",
 157                                                        bb, show_pseudo(insn->func),
 158                                                        insn->pos.line, insn->pos.line, insn->pos.pos);
 159                                 }
 160                         }
 161                 } END_FOR_EACH_PTR(insn);
 162         } END_FOR_EACH_PTR(bb);
 163 }
 164
 165 int main(int argc, char **argv)
 166 {
 167         struct string_list *filelist = NULL;
 168         char *file;
 169         struct symbol *sym;
 170
 171         struct symbol_list *fsyms, *all_syms=NULL;
 172
 173         printf("digraph call_graph {\n");
 174         fsyms = sparse_initialize(argc, argv, &filelist);
 175         concat_symbol_list(fsyms, &all_syms);
 176
 177         /* Linearize all symbols, graph internal basic block
 178          * structures and intra-file calls */
 179         FOR_EACH_PTR(filelist, file) {
 180
 181                 fsyms = sparse(file);
 182                 concat_symbol_list(fsyms, &all_syms);
 183
 184                 FOR_EACH_PTR(fsyms, sym) {
 185                         expand_symbol(sym);
 186                         linearize_symbol(sym);
 187                 } END_FOR_EACH_PTR(sym);
 188
 189                 FOR_EACH_PTR(fsyms, sym) {
 190                         if (sym->ep) {
 191                                 graph_ep(sym->ep);
 192                                 graph_calls(sym->ep, 1);
 193                         }
 194                 } END_FOR_EACH_PTR(sym);
 195
 196         } END_FOR_EACH_PTR(file);
 197
 198         /* Graph inter-file calls */
 199         FOR_EACH_PTR(all_syms, sym) {
 200                 if (sym->ep)
 201                         graph_calls(sym->ep, 0);
 202         } END_FOR_EACH_PTR(sym);
 203
 204         printf("}\n");
 205         return 0;
 206 }