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path: root/src/output.c
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/* This file is part of GNU cflow
   Copyright (C) 1997,2005 Sergey Poznyakoff
 
   GNU cflow 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 2 of the License, or
   (at your option) any later version.
 
   GNU cflow 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 GNU cflow; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
   MA 02110-1301 USA */

#include <cflow.h>
#include <parser.h>

unsigned char *level_mark;
/* Tree level information. level_mark[i] contains 1 if there are more
 * leafs on the level `i', otherwise it contains 0
 */
int level_mark_size = 0;   /* Actual size of level_mark */
int level_mark_incr = 128; /* level_mark is expanded by this number of bytes */

int out_line = 1; /* Current output line number */
FILE *outfile;    /* Output file */

static void
set_level_mark(int lev, int mark)
{
     if (lev >= level_mark_size) {
	  level_mark_size += level_mark_incr;
	  level_mark = xrealloc(level_mark, level_mark_size);
     }
     level_mark[lev] = mark;
}

/* Print current tree level
 */
void
print_level(int lev, int last)
{
     int i;

     if (print_line_numbers) 
	  fprintf(outfile, "%5d ", out_line);
     if (print_levels)
	  fprintf(outfile, "{%4d} ", lev);
     fprintf(outfile, "%s", level_begin);
     for (i = 0; i < lev; i++) 
	  fprintf(outfile, "%s", level_indent[ level_mark[i] ]);
     fprintf(outfile, "%s", level_end[last]);
}


/* Low level output functions */

struct output_driver {
     char *name;
     int (*handler) (cflow_output_command cmd,
		     FILE *outfile, int line,
		     void *data, void *handler_data);
     void *handler_data;
};

static int driver_index;
static int driver_max=0;
struct output_driver output_driver[MAX_OUTPUT_DRIVERS];

int
register_output(const char *name,
		int (*handler) (cflow_output_command cmd,
				FILE *outfile, int line,
				void *data, void *handler_data),
		void *handler_data)
{
     if (driver_max == MAX_OUTPUT_DRIVERS-1)
	  abort ();
     output_driver[driver_max].name = strdup(name);
     output_driver[driver_max].handler = handler;
     output_driver[driver_max].handler_data = handler_data;
     return driver_max++;
}

int
select_output_driver(const char *name)
{
     int i;
     for (i = 0; i < driver_max; i++)
	  if (strcmp(output_driver[i].name, name) == 0) {
	       driver_index = i;
	       return 0;
	  }
     return -1;
}

void
output_init()
{
     output_driver[driver_index].handler(cflow_output_init,
					 NULL, 0,
					 NULL,
				         output_driver[driver_index].handler_data);
}

void
newline()
{
     output_driver[driver_index].handler(cflow_output_newline,
					 outfile, out_line,
					 NULL,
				         output_driver[driver_index].handler_data);
     out_line++;
}

static void
begin()
{
     output_driver[driver_index].handler(cflow_output_begin,
					 outfile, out_line,
					 NULL,
					 output_driver[driver_index].handler_data);
}

static void
end()
{
     output_driver[driver_index].handler(cflow_output_end,
					 outfile, out_line,
					 NULL,
					 output_driver[driver_index].handler_data);
}

static void
separator()
{
     output_driver[driver_index].handler(cflow_output_separator,
					 outfile, out_line,
					 NULL,
					 output_driver[driver_index].handler_data);
}

static void
print_text(char *buf)
{
     output_driver[driver_index].handler(cflow_output_text,
					 outfile, out_line,
					 buf,
					 output_driver[driver_index].handler_data);
}

static int
print_symbol (int direct, int level, int last, Symbol *sym)
{
     struct output_symbol output_symbol;

     output_symbol.direct = direct;
     output_symbol.level = level;
     output_symbol.last = last;
     output_symbol.sym = sym;

     return output_driver[driver_index].handler(cflow_output_symbol,
						outfile, out_line,
						&output_symbol,
						output_driver[driver_index].handler_data);
}


static int
compare(const void *ap, const void *bp)
{
     Symbol * const *a = ap;
     Symbol * const *b = bp;
     return strcmp((*a)->name, (*b)->name);
}

static int
is_var(Symbol *symp)
{
     if (include_symbol(symp)) {
	  if (symp->type == SymIdentifier) 
	       return symp->storage == ExternStorage ||
	 	      symp->storage == StaticStorage;
	  else
	       return 1;
     }
     return 0;
}

static void
clear_active(Symbol *sym)
{
     sym->active = 0;
}


/* Cross-reference output */
void
print_refs(char *name, Consptr cons)
{
     Ref *refptr;
    
     for ( ; cons; cons = CDR(cons)) {
	  refptr = (Ref*)CAR(cons);
	  fprintf(outfile, "%s   %s:%d\n",
		  name,
		  refptr->source,
		  refptr->line);
     }
}

static void
print_function(Symbol *symp)
{
     if (symp->source) {
	  fprintf(outfile, "%s * %s:%d %s\n",
		  symp->name,
		  symp->source,
		  symp->def_line,
		  symp->decl);
     }
     print_refs(symp->name, symp->ref_line);
}

static void
print_type(Symbol *symp)
{
     if (symp->source)
	  fprintf(outfile, "%s t %s:%d\n",
		  symp->name,
		  symp->source,
		  symp->def_line);
}
   
void
xref_output()
{
     Symbol **symbols, *symp;
     int i, num;
     
     num = collect_symbols(&symbols, is_var);
     qsort(symbols, num, sizeof(*symbols), compare);
     
     /* produce xref output */
     for (i = 0; i < num; i++) {
	  symp = symbols[i];
	  switch (symp->type) {
	  case SymIdentifier:
	       print_function(symp);
	       break;
	  case SymToken:
	       print_type(symp);
	       break;
	  case SymUndefined:
	       break;
	  }
     }
     free(symbols);
}



/* Tree output */

/* Scan call tree. Mark the recursive calls
 */
static void
scan_tree(int lev, Symbol *sym)
{
     Consptr cons;

     if (sym->type == SymUndefined)
	  return;
     if (sym->active) {
	  sym->recursive = 1;
	  return;
     }
     sym->active = 1;
     for (cons = sym->callee; cons; cons = CDR(cons)) {
	  scan_tree(lev+1, (Symbol*)CAR(cons));
     }
     sym->active = 0;
}

static void
set_active(Symbol *sym)
{
     sym->active = out_line;
}

static int
is_printable(Consptr cons)
{
     return cons != NULL && include_symbol((Symbol*)CAR(cons));
}

static int
is_last(Consptr cons)
{
     while (cons = CDR(cons)) 
	  if (is_printable(cons))
	       return 0;
     return 1;
}

/* Produce direct call tree output
 */
static void
direct_tree(int lev, int last, Symbol *sym)
{
     Consptr cons;
     int rc;
     
     if (sym->type == SymUndefined
	 || (max_depth && lev >= max_depth)
	 || !include_symbol(sym))
	  return;

     rc = print_symbol(1, lev, last, sym);
     newline();
     if (rc || sym->active)
	  return;
     set_active(sym);
     for (cons = sym->callee; cons; cons = CDR(cons)) {
	  set_level_mark(lev+1, is_printable(CDR(cons)));
	  direct_tree(lev+1, is_last(cons), (Symbol*)CAR(cons));
     }
     clear_active(sym);
}

/* Produce reverse call tree output
 */
static void
inverted_tree(int lev, int last, Symbol *sym)
{
     Consptr cons;
     int rc;
     
     if (sym->type == SymUndefined
	 || (max_depth && lev >= max_depth)
	 || !include_symbol(sym))
	  return;
     rc = print_symbol(0, lev, last, sym);
     newline();
     if (rc || sym->active)
	  return;
     set_active(sym);
     for (cons = sym->caller; cons; cons = CDR(cons)) {
	  set_level_mark(lev+1, is_printable(CDR(cons)));
	  inverted_tree(lev+1, is_last(cons), (Symbol*)CAR(cons));
     }
     clear_active(sym);
}

static void
tree_output()
{
     Symbol **symbols, *main_sym;
     int i, num;
     
     /* Collect and sort symbols */
     num = collect_symbols(&symbols, is_var);
     qsort(symbols, num, sizeof(*symbols), compare);
     /* Scan and mark the recursive ones */
     for (i = 0; i < num; i++) {
	  if (symbols[i]->callee)
	       scan_tree(0, symbols[i]);
     }
     
     /* Produce output */
    begin();
    
    if (reverse_tree) {
	 for (i = 0; i < num; i++) {
	      inverted_tree(0, 0, symbols[i]);
	      separator();
	 }
    } else {
	 main_sym = lookup(start_name);
	 if (main_sym) {
	      direct_tree(0, 0, main_sym);
	      separator();
	 } else {
	      for (i = 0; i < num; i++) {
		   if (symbols[i]->callee == NULL)
			continue;
		   direct_tree(0, 0, symbols[i]);
		   separator();
	      }
	 }
    }
    
    end();
    
    free(symbols);
}

void
output()
{
     if (strcmp(outname, "-") == 0) {
	  outfile = stdout;
     } else {
	  outfile = fopen(outname, "w");
	  if (!outfile)
	       error(2, errno, _("cannot open file `%s'"), outname);
     } 
     
     set_level_mark(0, 0);
     if (print_option & PRINT_XREF) {
	  xref_output();
     }
     if (print_option & PRINT_TREE) {
	  tree_output();
     }
     fclose(outfile);
}






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