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/* Output a graph of the generated parser, for Bison.
Copyright (C) 2001-2007, 2009-2015, 2018-2021 Free Software
Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
This program 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 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#include "print-graph.h"
#include "system.h"
#include "closure.h"
#include "complain.h"
#include "conflicts.h"
#include "files.h"
#include "getargs.h"
#include "gram.h"
#include "graphviz.h"
#include "lalr.h"
#include "lr0.h"
#include "reader.h"
#include "state.h"
#include "symtab.h"
/*----------------------------.
| Construct the node labels. |
`----------------------------*/
/* Print the lhs of a rule in such a manner that there is no vertical
repetition, like in *.output files. */
static void
print_core (struct obstack *oout, state *s)
{
item_index const *sitems = s->items;
sym_content *previous_lhs = NULL;
size_t snritems = s->nitems;
/* Output all the items of a state, not just its kernel. */
if (report_flag & report_itemsets)
{
closure (sitems, snritems);
sitems = itemset;
snritems = nitemset;
}
obstack_printf (oout, _("State %d"), s->number);
obstack_sgrow (oout, "\\n\\l");
for (size_t i = 0; i < snritems; ++i)
{
item_number const *sp1 = ritem + sitems[i];
rule const *r = item_rule (sp1);
obstack_printf (oout, "%3d ", r->number);
if (previous_lhs && UNIQSTR_EQ (previous_lhs->symbol->tag,
r->lhs->symbol->tag))
obstack_printf (oout, "%*s| ",
(int) strlen (previous_lhs->symbol->tag), "");
else
{
obstack_backslash (oout, r->lhs->symbol->tag);
obstack_printf (oout, ": ");
}
previous_lhs = r->lhs;
for (item_number const *sp = r->rhs; sp < sp1; sp++)
{
obstack_backslash (oout, symbols[*sp]->tag);
obstack_1grow (oout, ' ');
}
obstack_sgrow (oout, "•");
if (0 <= *r->rhs)
for (item_number const *sp = sp1; 0 <= *sp; ++sp)
{
obstack_1grow (oout, ' ');
obstack_backslash (oout, symbols[*sp]->tag);
}
else
obstack_sgrow (oout, " %empty");
/* Experimental feature: display the lookahead tokens. */
if (report_flag & report_lookaheads
&& item_number_is_rule_number (*sp1))
{
/* Find the reduction we are handling. */
reductions *reds = s->reductions;
int redno = state_reduction_find (s, r);
/* Print them if there are. */
if (reds->lookaheads && redno != -1)
{
bitset_iterator biter;
int k;
char const *sep = "";
obstack_sgrow (oout, " [");
BITSET_FOR_EACH (biter, reds->lookaheads[redno], k, 0)
{
obstack_sgrow (oout, sep);
obstack_backslash (oout, symbols[k]->tag);
sep = ", ";
}
obstack_1grow (oout, ']');
}
}
obstack_sgrow (oout, "\\l");
}
}
/*---------------------------------------------------------------.
| Output in graph_obstack edges specifications in incidence with |
| current node. |
`---------------------------------------------------------------*/
static void
print_actions (state const *s, FILE *fgraph)
{
transitions const *trans = s->transitions;
if (!trans->num && !s->reductions)
return;
for (int i = 0; i < trans->num; i++)
if (!TRANSITION_IS_DISABLED (trans, i))
{
const state *s1 = trans->states[i];
const symbol_number sym = s1->accessing_symbol;
/* Shifts are solid, gotos are dashed, and error is dotted. */
char const *style =
(TRANSITION_IS_ERROR (trans, i) ? "dotted"
: TRANSITION_IS_SHIFT (trans, i) ? "solid"
: "dashed");
if (TRANSITION_IS_ERROR (trans, i)
&& STRNEQ (symbols[sym]->tag, "error"))
abort ();
output_edge (s->number, s1->number,
TRANSITION_IS_ERROR (trans, i) ? NULL : symbols[sym]->tag,
style, fgraph);
}
/* Display reductions. */
output_red (s, s->reductions, fgraph);
}
/*-------------------------------------------------------------.
| Output in FGRAPH the current node specifications and exiting |
| edges. |
`-------------------------------------------------------------*/
static void
print_state (state *s, FILE *fgraph)
{
struct obstack node_obstack;
/* A node's label contains its items. */
obstack_init (&node_obstack);
print_core (&node_obstack, s);
output_node (s->number, obstack_finish0 (&node_obstack), fgraph);
obstack_free (&node_obstack, 0);
/* Output the edges. */
print_actions (s, fgraph);
}
void
print_graph (void)
{
FILE *fgraph = xfopen (spec_graph_file, "w");
start_graph (fgraph);
/* Output nodes and edges. */
for (int i = 0; i < nstates; i++)
print_state (states[i], fgraph);
finish_graph (fgraph);
xfclose (fgraph);
}
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