mirror of
https://git.code.sf.net/p/quake/quakeforge
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55ecf94f2d
Return statements never flow to the next block (or any other block, for that matter), so drawing arrows leaving them not only messes up dot's graphs, but is quite missleading.
253 lines
6.3 KiB
C
253 lines
6.3 KiB
C
/*
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dot_flow.c
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"emit" flow graphs to dot (graphvis).
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Copyright (C) 2011 Bill Currie <bill@taniwha.org>
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Author: Bill Currie <bill@taniwha.org>
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Date: 2011/01/21
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif
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#include <stdlib.h>
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#include <QF/dstring.h>
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#include <QF/quakeio.h>
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#include <QF/va.h>
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#include "expr.h"
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#include "statements.h"
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#include "symtab.h"
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#include "type.h"
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static const char *
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quote_string (const char *str)
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{
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static dstring_t *q;
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char c[2] = {0, 0};
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if (!str)
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return "(null)";
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if (!q)
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q = dstring_new ();
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dstring_clearstr (q);
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while ((c[0] = *str++)) {
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switch (c[0]) {
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case '\n':
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dstring_appendstr (q, "\\\\n");
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break;
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case '<':
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dstring_appendstr (q, "<");
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break;
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case '>':
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dstring_appendstr (q, ">");
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break;
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case '&':
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dstring_appendstr (q, "&");
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break;
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case '"':
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dstring_appendstr (q, """);
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break;
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default:
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dstring_appendstr (q, c);
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break;
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}
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}
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return q->str;
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}
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static const char *
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get_operand (operand_t *op)
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{
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type_t *type;
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if (!op)
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return "";
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switch (op->op_type) {
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case op_symbol:
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return op->o.symbol->name;
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case op_value:
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switch (op->o.value->type) {
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case ev_string:
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return quote_string (op->o.value->v.string_val);
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case ev_float:
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return va ("%g", op->o.value->v.float_val);
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case ev_vector:
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return va ("'%g %g %g'",
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op->o.value->v.vector_val[0],
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op->o.value->v.vector_val[1],
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op->o.value->v.vector_val[2]);
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case ev_quat:
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return va ("'%g %g %g %g'",
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op->o.value->v.quaternion_val[0],
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op->o.value->v.quaternion_val[1],
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op->o.value->v.quaternion_val[2],
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op->o.value->v.quaternion_val[3]);
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case ev_pointer:
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return va ("ptr %d", op->o.value->v.pointer.val);
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case ev_field:
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return va ("field %d", op->o.value->v.pointer.val);
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case ev_entity:
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return va ("ent %d", op->o.value->v.integer_val);
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case ev_func:
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return va ("func %d", op->o.value->v.integer_val);
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case ev_integer:
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return va ("int %d", op->o.value->v.integer_val);
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case ev_uinteger:
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return va ("uint %u", op->o.value->v.uinteger_val);
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case ev_short:
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return va ("short %d", op->o.value->v.short_val);
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case ev_void:
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return "(void)";
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case ev_invalid:
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return "(invalid)";
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case ev_type_count:
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return "(type_count)";
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}
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break;
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case op_label:
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return op->o.label->name;
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case op_temp:
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return va ("tmp %p", op);
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case op_pointer:
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type = op->o.pointer->type;
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if (op->o.pointer->def)
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return va ("(%s)[%d]<%s>",
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type ? pr_type_name[type->type] : "???",
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op->o.pointer->val, op->o.pointer->def->name);
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else
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return va ("(%s)[%d]",
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type ? pr_type_name[type->type] : "???",
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op->o.pointer->val);
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case op_alias:
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return get_operand (op->o.alias);//FIXME better output
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}
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return ("??");
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}
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static void
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flow_statement (dstring_t *dstr, statement_t *s)
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{
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dasprintf (dstr, " <tr>");
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dasprintf (dstr, "<td>%s</td>", quote_string (s->opcode));
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dasprintf (dstr, "<td>%s</td>", get_operand (s->opa));
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dasprintf (dstr, "<td>%s</td>", get_operand (s->opb));
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dasprintf (dstr, "<td>%s</td>", get_operand (s->opc));
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dasprintf (dstr, "</tr>\n");
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}
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static int
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is_goto (statement_t *s)
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{
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if (!s)
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return 0;
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return !strcmp (s->opcode, "<GOTO>");
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}
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static int
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is_return (statement_t *s)
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{
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if (!s)
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return 0;
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return !strncmp (s->opcode, "<RETURN", 7);
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}
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static sblock_t *
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get_target (statement_t *s)
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{
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if (!s)
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return 0;
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if (!strncmp (s->opcode, "<IF", 3))
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return s->opb->o.label->dest;
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if (!strcmp (s->opcode, "<GOTO>"))
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return s->opa->o.label->dest;
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return 0;
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}
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static void
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flow_sblock (dstring_t *dstr, sblock_t *sblock, int blockno)
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{
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statement_t *s;
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sblock_t *target;
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ex_label_t *l;
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dasprintf (dstr, " sb_%p [shape=none,label=<\n", sblock);
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dasprintf (dstr, " <table border=\"0\" cellborder=\"1\" "
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"cellspacing=\"0\">\n");
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dasprintf (dstr, " <tr>\n");
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dasprintf (dstr, " <td>%p(%d)</td>\n", sblock, blockno);
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dasprintf (dstr, " <td height=\"0\" colspan=\"2\" port=\"s\">\n");
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for (l = sblock->labels; l; l = l->next)
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dasprintf (dstr, " %s(%d)\n", l->name, l->used);
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dasprintf (dstr, " </td>\n");
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dasprintf (dstr, " <td></td>\n");
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dasprintf (dstr, " </tr>\n");
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for (s = sblock->statements; s; s = s->next)
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flow_statement (dstr, s);
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dasprintf (dstr, " <tr>\n");
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dasprintf (dstr, " <td></td>\n");
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dasprintf (dstr, " <td height=\"0\" colspan=\"2\" "
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"port=\"e\"></td>\n");
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dasprintf (dstr, " <td></td>\n");
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dasprintf (dstr, " </tr>\n");
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dasprintf (dstr, " </table>>];\n");
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if (sblock->next && !is_goto ((statement_t *) sblock->tail)
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&& !is_return ((statement_t *) sblock->tail))
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dasprintf (dstr, " sb_%p:e -> sb_%p:s;\n", sblock, sblock->next);
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if ((target = get_target ((statement_t *) sblock->tail)))
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dasprintf (dstr, " sb_%p:e -> sb_%p:s [label=\"%s\"];\n", sblock,
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target, ((statement_t *) sblock->tail)->opcode);
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dasprintf (dstr, "\n");
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}
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void
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print_flow (sblock_t *sblock, const char *filename)
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{
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int i;
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dstring_t *dstr = dstring_newstr();
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dasprintf (dstr, "digraph flow_%p {\n", sblock);
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dasprintf (dstr, " layout=dot; rankdir=TB;\n");
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for (i = 0; sblock; sblock = sblock->next, i++)
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flow_sblock (dstr, sblock, i);
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dasprintf (dstr, "}\n");
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if (filename) {
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QFile *file;
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file = Qopen (filename, "wt");
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Qwrite (file, dstr->str, dstr->size - 1);
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Qclose (file);
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} else {
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fputs (dstr->str, stdout);
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}
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dstring_delete (dstr);
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}
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