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/* Generate Graphiviz format .dot dump of functions control flow graph,
similar as the gcc internal vcg dump.
Copyright (C) 2010 by
Author: "Dennis, CHENG Renquan" <crquan@fedoraproject.org>
This software is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
It is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "gcc-plugin.h"
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "tree.h"
#include "rtl.h"
#include "basic-block.h"
#include "function.h"
#include "langhooks.h"
#include "tree-flow.h"
#include "tree-dump.h"
#include "tree-pass.h"
#include "toplev.h"
int plugin_is_GPL_compatible;
/* global variables */
static const char *plugin_name;
static int dot_nr;
static FILE *dot_file = NULL;
static bool disabled = false;
static struct plugin_info _version_help_info =
{
"0.1", /* version */
"Dump internal gimple cfg into Graphviz .dot format",
/* help */
};
static void
gimple_cfg2dot (void)
{
edge e;
edge_iterator ei;
basic_block bb;
const char *funcname
= lang_hooks.decl_printable_name (current_function_decl, 2);
/* Write the file header. */
fprintf (dot_file, "// Function %s\n", funcname);
fprintf (dot_file, "digraph graph_%s {\n\n", funcname);
fprintf (dot_file, " graph [ label=%s, labelloc=top ];\n\n", funcname);
/* Write blocks and edges. */
FOR_EACH_EDGE (e, ei, ENTRY_BLOCK_PTR->succs)
{
fprintf (dot_file, " ENTRY -> %d", e->dest->index);
/* how to represent this in Graphviz dot ??? */
/* if (e->flags & EDGE_FAKE) */
/* fprintf (file, " linestyle: dotted priority: 10"); */
/* else */
/* fprintf (file, " linestyle: solid priority: 100"); */
fprintf (dot_file, "\n");
}
fputc ('\n', dot_file);
FOR_EACH_BB (bb)
{
enum gimple_code head_code, end_code;
const char *head_name, *end_name;
int head_line = 0;
int end_line = 0;
gimple first = first_stmt (bb);
gimple last = last_stmt (bb);
if (first)
{
head_code = gimple_code (first);
head_name = gimple_code_name[head_code];
head_line = get_lineno (first);
}
else
head_name = "no-statement";
if (last)
{
end_code = gimple_code (last);
end_name = gimple_code_name[end_code];
end_line = get_lineno (last);
}
else
end_name = "no-statement";
fprintf (dot_file, " %d [ label=\"#%d\\n%s (%d)\\n%s (%d)\" ]\n",
bb->index, bb->index, head_name, head_line, end_name,
end_line);
FOR_EACH_EDGE (e, ei, bb->succs)
{
if (e->dest == EXIT_BLOCK_PTR)
fprintf (dot_file, " %d -> EXIT\n", bb->index);
else
{
fprintf (dot_file, " %d -> %d", bb->index, e->dest->index);
/* if (e->flags & EDGE_FAKE) */
/* fprintf (file, " priority: 10 linestyle: dotted"); */
/* else */
/* fprintf (file, " priority: 100 linestyle: solid"); */
fprintf (dot_file, "\n");
}
}
if (bb->next_bb != EXIT_BLOCK_PTR)
fputc ('\n', dot_file);
}
fprintf (dot_file, "}\n\n");
}
static void
open_dump_file (void)
{
dot_nr = dump_register (".dot", NULL, NULL, TDF_TREE);
/* manually set dfi->state to -1 enable it,
because the dump_enable is static, cannot be used
by plugins.
*/
get_dump_file_info (dot_nr)->state = -1;
dot_file = dump_begin (dot_nr, NULL);
if (dot_file)
{
time_t now;
time (&now);
fprintf (dot_file,
"\n// Generated by %s gcc plugin %s at %s\n",
plugin_name, _version_help_info.version,
ctime (&now));
}
else
{
warning (0, "dot dump file open failed, diable this pass for following functions.");
disabled = true;
}
}
static bool
gate_enabled (void)
{
return !disabled;
}
static unsigned int
execute_pass_cfg2dot (void)
{
if (!dot_file)
open_dump_file ();
gimple_cfg2dot ();
return 0;
}
static struct gimple_opt_pass pass_cfg2dot =
{
{
GIMPLE_PASS,
"*cfg2dot", /* name */
gate_enabled, /* gate */
execute_pass_cfg2dot, /* execute */
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
TV_NONE, /* tv_id */
PROP_cfg, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
0 /* todo_flags_finish */
}
};
static void
plugin_finish_unit (void *gcc_data,
void *user_data)
{
if (dot_file)
{
dump_end (dot_nr, dot_file);
dot_file = NULL;
dot_nr = 0;
}
}
int
plugin_init (struct plugin_name_args *plugin_info,
struct plugin_gcc_version *version)
{
struct register_pass_info regi_info;
plugin_name = plugin_info->base_name;
register_callback (plugin_name,
PLUGIN_INFO,
NULL,
&_version_help_info);
register_callback (plugin_name,
PLUGIN_FINISH_UNIT,
plugin_finish_unit,
NULL);
regi_info.pass = &pass_cfg2dot.pass;
regi_info.reference_pass_name = "cfg";
regi_info.ref_pass_instance_number = 0;
regi_info.pos_op = PASS_POS_INSERT_AFTER;
register_callback (plugin_name,
PLUGIN_PASS_MANAGER_SETUP,
NULL,
®i_info);
return 0;
}
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