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debug.c revision 1.31 
      1 /*	$NetBSD: debug.c,v 1.31 2023/06/04 14:20:00 rillig Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2023 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Roland Illig <rillig (at) NetBSD.org>.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __RCSID("$NetBSD: debug.c,v 1.31 2023/06/04 14:20:00 rillig Exp $");
     34 
     35 #include <stdarg.h>
     36 
     37 #include "indent.h"
     38 
     39 #ifdef debug
     40 
     41 /*-
     42  * false	show only the changes to the parser state
     43  * true		show unchanged parts of the parser state as well
     44  */
     45 static bool debug_full_parser_state = true;
     46 
     47 const char *const lsym_name[] = {
     48 	"eof",
     49 	"preprocessing",
     50 	"newline",
     51 	"comment",
     52 	"lparen",
     53 	"lbracket",
     54 	"rparen",
     55 	"rbracket",
     56 	"lbrace",
     57 	"rbrace",
     58 	"period",
     59 	"unary_op",
     60 	"binary_op",
     61 	"postfix_op",
     62 	"question",
     63 	"'?:' colon",
     64 	"label colon",
     65 	"other colon",
     66 	"comma",
     67 	"semicolon",
     68 	"typedef",
     69 	"modifier",
     70 	"type_outside_parentheses",
     71 	"type_in_parentheses",
     72 	"tag",
     73 	"case",
     74 	"default",
     75 	"sizeof",
     76 	"offsetof",
     77 	"word",
     78 	"funcname",
     79 	"do",
     80 	"else",
     81 	"for",
     82 	"if",
     83 	"switch",
     84 	"while",
     85 	"return",
     86 };
     87 
     88 const char *const psym_name[] = {
     89 	"0",
     90 	"lbrace",
     91 	"rbrace",
     92 	"decl",
     93 	"stmt",
     94 	"stmt_list",
     95 	"for_exprs",
     96 	"if_expr",
     97 	"if_expr_stmt",
     98 	"if_expr_stmt_else",
     99 	"else",
    100 	"switch_expr",
    101 	"do",
    102 	"do_stmt",
    103 	"while_expr",
    104 };
    105 
    106 static const char *const declaration_name[] = {
    107 	"no",
    108 	"begin",
    109 	"end",
    110 };
    111 
    112 static const char *const in_enum_name[] = {
    113 	"no",
    114 	"enum",
    115 	"type",
    116 	"brace",
    117 };
    118 
    119 const char *const paren_level_cast_name[] = {
    120 	"(unknown cast)",
    121 	"(maybe cast)",
    122 	"(no cast)",
    123 };
    124 
    125 const char *const line_kind_name[] = {
    126 	"other",
    127 	"blank",
    128 	"#if",
    129 	"#endif",
    130 	"stmt head",
    131 	"}",
    132 	"block comment",
    133 	"case/default",
    134 };
    135 
    136 static const char *const decl_ptr_name[] = {
    137 	"start",
    138 	"word",
    139 	"word *",
    140 	"other",
    141 };
    142 
    143 static unsigned wrote_newlines = 1;
    144 
    145 void
    146 debug_printf(const char *fmt, ...)
    147 {
    148 	FILE *f = output == stdout ? stderr : stdout;
    149 	va_list ap;
    150 
    151 	va_start(ap, fmt);
    152 	vfprintf(f, fmt, ap);
    153 	va_end(ap);
    154 	wrote_newlines = 0;
    155 }
    156 
    157 void
    158 debug_println(const char *fmt, ...)
    159 {
    160 	FILE *f = output == stdout ? stderr : stdout;
    161 	va_list ap;
    162 
    163 	va_start(ap, fmt);
    164 	vfprintf(f, fmt, ap);
    165 	va_end(ap);
    166 	fprintf(f, "\n");
    167 	wrote_newlines = fmt[0] == '\0' ? wrote_newlines + 1 : 1;
    168 }
    169 
    170 void
    171 debug_blank_line(void)
    172 {
    173 	while (wrote_newlines < 2)
    174 		debug_println("");
    175 }
    176 
    177 void
    178 debug_vis_range(const char *prefix, const char *s, size_t len,
    179     const char *suffix)
    180 {
    181 	debug_printf("%s", prefix);
    182 	for (size_t i = 0; i < len; i++) {
    183 		const char *p = s + i;
    184 		if (*p == '\\' || *p == '"')
    185 			debug_printf("\\%c", *p);
    186 		else if (isprint((unsigned char)*p))
    187 			debug_printf("%c", *p);
    188 		else if (*p == '\n')
    189 			debug_printf("\\n");
    190 		else if (*p == '\t')
    191 			debug_printf("\\t");
    192 		else
    193 			debug_printf("\\x%02x", (unsigned char)*p);
    194 	}
    195 	debug_printf("%s", suffix);
    196 }
    197 
    198 void
    199 debug_print_buf(const char *name, const struct buffer *buf)
    200 {
    201 	if (buf->len > 0) {
    202 		debug_printf(" %s ", name);
    203 		debug_vis_range("\"", buf->st, buf->len, "\"");
    204 	}
    205 }
    206 
    207 void
    208 debug_buffers(void)
    209 {
    210 	debug_print_buf("label", &lab);
    211 	debug_print_buf("code", &code);
    212 	debug_print_buf("comment", &com);
    213 	debug_println("");
    214 }
    215 
    216 #define debug_ps_bool(name) \
    217 	if (ps.name != prev_ps.name) \
    218 	    debug_println("[%c] -> [%c] ps." #name, \
    219 		prev_ps.name ? 'x' : ' ', ps.name ? 'x' : ' '); \
    220 	else if (debug_full_parser_state) \
    221 	    debug_println("       [%c] ps." #name, ps.name ? 'x' : ' ')
    222 #define debug_ps_int(name) \
    223 	if (ps.name != prev_ps.name) \
    224 	    debug_println("%3d -> %3d ps." #name, prev_ps.name, ps.name); \
    225 	else if (debug_full_parser_state) \
    226 	    debug_println("       %3d ps." #name, ps.name)
    227 #define debug_ps_enum(name, names) \
    228 	if (ps.name != prev_ps.name) \
    229 	    debug_println("%3s -> %3s ps." #name, \
    230 		(names)[prev_ps.name], (names)[ps.name]); \
    231 	else if (debug_full_parser_state) \
    232 	    debug_println("%10s ps." #name, (names)[ps.name])
    233 
    234 static bool
    235 ps_paren_has_changed(const struct parser_state *prev_ps)
    236 {
    237 	if (prev_ps->nparen != ps.nparen)
    238 		return true;
    239 
    240 	const paren_level_props *prev = prev_ps->paren, *curr = ps.paren;
    241 	for (int i = 0; i < ps.nparen; i++)
    242 		if (curr[i].indent != prev[i].indent
    243 		    || curr[i].cast != prev[i].cast)
    244 			return true;
    245 	return false;
    246 }
    247 
    248 static void
    249 debug_ps_paren(const struct parser_state *prev_ps)
    250 {
    251 	if (!debug_full_parser_state && !ps_paren_has_changed(prev_ps))
    252 		return;
    253 
    254 	debug_printf("           ps.paren:");
    255 	for (int i = 0; i < ps.nparen; i++) {
    256 		debug_printf(" %s%d",
    257 		    paren_level_cast_name[ps.paren[i].cast],
    258 		    ps.paren[i].indent);
    259 	}
    260 	if (ps.nparen == 0)
    261 		debug_printf(" none");
    262 	debug_println("");
    263 }
    264 
    265 static bool
    266 ps_di_stack_has_changed(const struct parser_state *prev_ps)
    267 {
    268 	if (prev_ps->decl_level != ps.decl_level)
    269 		return true;
    270 	for (int i = 0; i < ps.decl_level; i++)
    271 		if (prev_ps->di_stack[i] != ps.di_stack[i])
    272 			return true;
    273 	return false;
    274 }
    275 
    276 static void
    277 debug_ps_di_stack(const struct parser_state *prev_ps)
    278 {
    279 	bool changed = ps_di_stack_has_changed(prev_ps);
    280 	if (!debug_full_parser_state && !changed)
    281 		return;
    282 
    283 	debug_printf("    %s     ps.di_stack:", changed ? "->" : "  ");
    284 	for (int i = 0; i < ps.decl_level; i++)
    285 		debug_printf(" %d", ps.di_stack[i]);
    286 	if (ps.decl_level == 0)
    287 		debug_printf(" none");
    288 	debug_println("");
    289 }
    290 
    291 void
    292 debug_parser_state(void)
    293 {
    294 	static struct parser_state prev_ps;
    295 
    296 	debug_blank_line();
    297 	debug_println("           ps.prev_lsym = %s",
    298 	    lsym_name[ps.prev_lsym]);
    299 	debug_ps_bool(curr_col_1);
    300 	debug_ps_bool(next_col_1);
    301 	debug_ps_bool(next_unary);
    302 	debug_ps_bool(is_function_definition);
    303 	debug_ps_bool(want_blank);
    304 	debug_ps_bool(break_after_comma);
    305 	debug_ps_bool(force_nl);
    306 	debug_ps_int(line_start_nparen);
    307 	debug_ps_int(nparen);
    308 	debug_ps_paren(&prev_ps);
    309 
    310 	debug_ps_int(comment_delta);
    311 	debug_ps_int(n_comment_delta);
    312 	debug_ps_int(com_ind);
    313 
    314 	debug_ps_bool(block_init);
    315 	debug_ps_int(block_init_level);
    316 	debug_ps_bool(init_or_struct);
    317 
    318 	debug_ps_int(ind_level);
    319 	debug_ps_int(ind_level_follow);
    320 
    321 	debug_ps_int(decl_level);
    322 	debug_ps_di_stack(&prev_ps);
    323 	debug_ps_bool(decl_on_line);
    324 	debug_ps_bool(in_decl);
    325 	debug_ps_enum(declaration, declaration_name);
    326 	debug_ps_bool(blank_line_after_decl);
    327 	debug_ps_bool(in_func_def_params);
    328 	debug_ps_enum(in_enum, in_enum_name);
    329 	debug_ps_enum(decl_ptr, decl_ptr_name);
    330 	debug_ps_bool(decl_indent_done);
    331 	debug_ps_int(decl_ind);
    332 	debug_ps_bool(tabs_to_var);
    333 
    334 	debug_ps_bool(in_stmt_or_decl);
    335 	debug_ps_bool(in_stmt_cont);
    336 	debug_ps_bool(seen_case);
    337 
    338 	// The debug output for the parser symbols is done in 'parse' instead.
    339 
    340 	debug_ps_enum(spaced_expr_psym, psym_name);
    341 	debug_ps_int(quest_level);
    342 	debug_blank_line();
    343 
    344 	prev_ps = ps;
    345 }
    346 
    347 void
    348 debug_parse_stack(const char *situation)
    349 {
    350 	printf("parse stack %s:", situation);
    351 	for (int i = 1; i <= ps.tos; ++i)
    352 		printf(" %s %d", psym_name[ps.s_sym[i]], ps.s_ind_level[i]);
    353 	if (ps.tos == 0)
    354 		printf(" empty");
    355 	printf("\n");
    356 }
    357 #endif
    358