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Fold trace status into the single hash table that's left.
Inline some macros/functions for speed.
So, this achieves the goal of one single lookup for macro/trace status,
which does speed up m4 in partial tracing situations somewhat.
This does also speed up m4 in large pushdef situations, since it no longer
has to lookup large chains of macros.

okay millert@

/* $OpenBSD: trace.c,v 1.10 2003/06/30 22:13:33 espie Exp $ */
/*
 * Copyright (c) 2001 Marc Espie.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OPENBSD
 * PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/types.h>
#include <stddef.h>
#include <stdio.h>
#include <err.h>
#include <stdlib.h>
#include "mdef.h"
#include "stdd.h"
#include "extern.h"

FILE *traceout = stderr;

#define TRACE_ARGS 	1
#define TRACE_EXPANSION 2
#define TRACE_QUOTE	4
#define TRACE_FILENAME	8
#define TRACE_LINENO	16
#define TRACE_CONT	32
#define TRACE_ID	64
#define TRACE_NEWFILE	128	/* not implemented yet */
#define TRACE_INPUT	256	/* not implemented yet */

static unsigned int letter_to_flag(int);
static void print_header(struct input_file *);
static struct t *find_trace_entry(const char *);
static int frame_level(void);


unsigned int trace_flags = TRACE_QUOTE | TRACE_EXPANSION;

void
trace_file(const char *name)
{

	if (traceout != stderr)
		fclose(traceout);
	traceout = fopen(name, "w");
	if (!traceout)
		err(1, "can't open %s", name);
}

static unsigned int
letter_to_flag(int c)
{
	switch(c) {
	case 'a':
		return TRACE_ARGS;
	case 'e':
		return TRACE_EXPANSION;
	case 'q':
		return TRACE_QUOTE;
	case 'c':
		return TRACE_CONT;
	case 'x':
		return TRACE_ID;
	case 'f':
		return TRACE_FILENAME;
	case 'l':
		return TRACE_LINENO;
	case 'p':
		return TRACE_NEWFILE;
	case 'i':
		return TRACE_INPUT;
	case 't':
		return TRACE_ALL;
	case 'V':
		return ~0;
	default:
		return 0;
	}
}

void
set_trace_flags(const char *s)
{
	char mode = 0;
	unsigned int f = 0;

	if (*s == '+' || *s == '-')
		mode = *s++;
	while (*s)
		f |= letter_to_flag(*s++);
	switch(mode) {
	case 0:
		trace_flags = f;
		break;
	case '+':
		trace_flags |= f;
		break;
	case '-':
		trace_flags &= ~f;
		break;
	}
}

static int
frame_level()
{
	int level;
	int framep;

	for (framep = fp, level = 0; framep != 0; 
		level++,framep = mstack[framep-3].sfra)
		;
	return level;
}

static void
print_header(struct input_file *inp)
{
	fprintf(traceout, "m4trace:");
	if (trace_flags & TRACE_FILENAME)
		fprintf(traceout, "%s:", inp->name);
	if (trace_flags & TRACE_LINENO)
		fprintf(traceout, "%lu:", inp->lineno);
	fprintf(traceout, " -%d- ", frame_level());
	if (trace_flags & TRACE_ID)
		fprintf(traceout, "id %lu: ", expansion_id);
}

ssize_t 
trace(const char *argv[], int argc, struct input_file *inp)
{
	print_header(inp);
	if (trace_flags & TRACE_CONT) {
		fprintf(traceout, "%s ...\n", argv[1]);
		print_header(inp);
	}
	fprintf(traceout, "%s", argv[1]);
	if ((trace_flags & TRACE_ARGS) && argc > 2) {
		char delim[3];
		int i;

		delim[0] = LPAREN;
		delim[1] = EOS;
		for (i = 2; i < argc; i++) {
			fprintf(traceout, "%s%s%s%s", delim, 
			    (trace_flags & TRACE_QUOTE) ? lquote : "", 
			    argv[i], 
			    (trace_flags & TRACE_QUOTE) ? rquote : "");
			delim[0] = COMMA;
			delim[1] = ' ';
			delim[2] = EOS;
		}
		fprintf(traceout, "%c", RPAREN);
	}
	if (trace_flags & TRACE_CONT) {
		fprintf(traceout, " -> ???\n");
		print_header(inp);
		fprintf(traceout, argc > 2 ? "%s(...)" : "%s", argv[1]);
	}
	if (trace_flags & TRACE_EXPANSION)
		return buffer_mark();
	else {
		fprintf(traceout, "\n");
		return -1;
	}
}

void 
finish_trace(size_t mark)
{
	fprintf(traceout, " -> ");
	if (trace_flags & TRACE_QUOTE)
		fprintf(traceout, "%s", lquote);
	dump_buffer(traceout, mark);
	if (trace_flags & TRACE_QUOTE)
		fprintf(traceout, "%s", rquote);
	fprintf(traceout, "\n");
}