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0
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1 /* Preprocess only, using cpplib.
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2 Copyright (C) 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007,
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3 2008 Free Software Foundation, Inc.
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4 Written by Per Bothner, 1994-95.
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5
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6 This program is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 3, or (at your option) any
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9 later version.
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10
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11 This program is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with this program; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #include "config.h"
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21 #include "system.h"
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22 #include "coretypes.h"
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23 #include "tm.h"
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24 #include "cpplib.h"
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25 #include "../libcpp/internal.h"
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26 #include "tree.h"
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27 #include "c-common.h" /* For flags. */
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28 #include "c-pragma.h" /* For parse_in. */
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29
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30 /* Encapsulates state used to convert a stream of tokens into a text
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31 file. */
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32 static struct
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33 {
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34 FILE *outf; /* Stream to write to. */
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35 const cpp_token *prev; /* Previous token. */
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36 const cpp_token *source; /* Source token for spacing. */
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37 int src_line; /* Line number currently being written. */
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38 unsigned char printed; /* Nonzero if something output at line. */
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39 bool first_time; /* pp_file_change hasn't been called yet. */
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40 } print;
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41
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42 /* Defined and undefined macros being queued for output with -dU at
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43 the next newline. */
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44 typedef struct macro_queue
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45 {
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46 struct macro_queue *next; /* Next macro in the list. */
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47 char *macro; /* The name of the macro if not
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48 defined, the full definition if
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49 defined. */
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50 } macro_queue;
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51 static macro_queue *define_queue, *undef_queue;
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52
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53 /* General output routines. */
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54 static void scan_translation_unit (cpp_reader *);
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55 static void print_lines_directives_only (int, const void *, size_t);
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56 static void scan_translation_unit_directives_only (cpp_reader *);
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57 static void scan_translation_unit_trad (cpp_reader *);
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58 static void account_for_newlines (const unsigned char *, size_t);
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59 static int dump_macro (cpp_reader *, cpp_hashnode *, void *);
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60 static void dump_queued_macros (cpp_reader *);
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61
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62 static void print_line (source_location, const char *);
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63 static void maybe_print_line (source_location);
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64
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65 /* Callback routines for the parser. Most of these are active only
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66 in specific modes. */
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67 static void cb_line_change (cpp_reader *, const cpp_token *, int);
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68 static void cb_define (cpp_reader *, source_location, cpp_hashnode *);
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69 static void cb_undef (cpp_reader *, source_location, cpp_hashnode *);
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70 static void cb_used_define (cpp_reader *, source_location, cpp_hashnode *);
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71 static void cb_used_undef (cpp_reader *, source_location, cpp_hashnode *);
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72 static void cb_include (cpp_reader *, source_location, const unsigned char *,
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73 const char *, int, const cpp_token **);
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74 static void cb_ident (cpp_reader *, source_location, const cpp_string *);
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75 static void cb_def_pragma (cpp_reader *, source_location);
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76 static void cb_read_pch (cpp_reader *pfile, const char *name,
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77 int fd, const char *orig_name);
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78
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79 /* Preprocess and output. */
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80 void
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81 preprocess_file (cpp_reader *pfile)
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82 {
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83 /* A successful cpp_read_main_file guarantees that we can call
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84 cpp_scan_nooutput or cpp_get_token next. */
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85 if (flag_no_output)
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86 {
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87 /* Scan -included buffers, then the main file. */
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88 while (pfile->buffer->prev)
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89 cpp_scan_nooutput (pfile);
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90 cpp_scan_nooutput (pfile);
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91 }
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92 else if (cpp_get_options (pfile)->traditional)
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93 scan_translation_unit_trad (pfile);
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94 else if (cpp_get_options (pfile)->directives_only
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95 && !cpp_get_options (pfile)->preprocessed)
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96 scan_translation_unit_directives_only (pfile);
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97 else
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98 scan_translation_unit (pfile);
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99
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100 /* -dM command line option. Should this be elsewhere? */
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101 if (flag_dump_macros == 'M')
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102 cpp_forall_identifiers (pfile, dump_macro, NULL);
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103
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104 /* Flush any pending output. */
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105 if (print.printed)
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106 putc ('\n', print.outf);
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107 }
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108
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109 /* Set up the callbacks as appropriate. */
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110 void
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111 init_pp_output (FILE *out_stream)
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112 {
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113 cpp_callbacks *cb = cpp_get_callbacks (parse_in);
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114
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115 if (!flag_no_output)
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116 {
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117 cb->line_change = cb_line_change;
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118 /* Don't emit #pragma or #ident directives if we are processing
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119 assembly language; the assembler may choke on them. */
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120 if (cpp_get_options (parse_in)->lang != CLK_ASM)
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121 {
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122 cb->ident = cb_ident;
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123 cb->def_pragma = cb_def_pragma;
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124 }
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125 }
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126
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127 if (flag_dump_includes)
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128 cb->include = cb_include;
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129
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130 if (flag_pch_preprocess)
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131 {
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132 cb->valid_pch = c_common_valid_pch;
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133 cb->read_pch = cb_read_pch;
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134 }
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135
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136 if (flag_dump_macros == 'N' || flag_dump_macros == 'D')
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137 {
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138 cb->define = cb_define;
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139 cb->undef = cb_undef;
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140 }
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141
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142 if (flag_dump_macros == 'U')
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143 {
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144 cb->before_define = dump_queued_macros;
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145 cb->used_define = cb_used_define;
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146 cb->used_undef = cb_used_undef;
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147 }
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148
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149 /* Initialize the print structure. */
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150 print.src_line = 1;
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151 print.printed = 0;
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152 print.prev = 0;
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153 print.outf = out_stream;
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154 print.first_time = 1;
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155 }
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156
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157 /* Writes out the preprocessed file, handling spacing and paste
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158 avoidance issues. */
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159 static void
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160 scan_translation_unit (cpp_reader *pfile)
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161 {
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162 bool avoid_paste = false;
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163
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164 print.source = NULL;
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165 for (;;)
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166 {
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167 const cpp_token *token = cpp_get_token (pfile);
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168
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169 if (token->type == CPP_PADDING)
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170 {
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171 avoid_paste = true;
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172 if (print.source == NULL
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173 || (!(print.source->flags & PREV_WHITE)
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174 && token->val.source == NULL))
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175 print.source = token->val.source;
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176 continue;
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177 }
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178
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179 if (token->type == CPP_EOF)
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180 break;
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181
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182 /* Subtle logic to output a space if and only if necessary. */
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183 if (avoid_paste)
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184 {
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185 if (print.source == NULL)
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186 print.source = token;
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187 if (print.source->flags & PREV_WHITE
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188 || (print.prev
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189 && cpp_avoid_paste (pfile, print.prev, token))
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190 || (print.prev == NULL && token->type == CPP_HASH))
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191 putc (' ', print.outf);
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192 }
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193 else if (token->flags & PREV_WHITE)
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194 putc (' ', print.outf);
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195
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196 avoid_paste = false;
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197 print.source = NULL;
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198 print.prev = token;
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199 if (token->type == CPP_PRAGMA)
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200 {
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201 const char *space;
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202 const char *name;
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203
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204 maybe_print_line (token->src_loc);
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205 fputs ("#pragma ", print.outf);
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206 c_pp_lookup_pragma (token->val.pragma, &space, &name);
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207 if (space)
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208 fprintf (print.outf, "%s %s", space, name);
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209 else
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210 fprintf (print.outf, "%s", name);
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211 print.printed = 1;
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212 }
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213 else if (token->type == CPP_PRAGMA_EOL)
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214 maybe_print_line (token->src_loc);
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215 else
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216 cpp_output_token (token, print.outf);
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217
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218 if (token->type == CPP_COMMENT)
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219 account_for_newlines (token->val.str.text, token->val.str.len);
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220 }
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221 }
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222
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223 static void
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224 print_lines_directives_only (int lines, const void *buf, size_t size)
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225 {
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226 print.src_line += lines;
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227 fwrite (buf, 1, size, print.outf);
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228 }
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229
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230 /* Writes out the preprocessed file, handling spacing and paste
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231 avoidance issues. */
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232 static void
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233 scan_translation_unit_directives_only (cpp_reader *pfile)
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234 {
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235 struct _cpp_dir_only_callbacks cb;
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236
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237 cb.print_lines = print_lines_directives_only;
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238 cb.maybe_print_line = maybe_print_line;
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239
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240 _cpp_preprocess_dir_only (pfile, &cb);
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241 }
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242
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243 /* Adjust print.src_line for newlines embedded in output. */
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244 static void
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245 account_for_newlines (const unsigned char *str, size_t len)
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246 {
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247 while (len--)
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248 if (*str++ == '\n')
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249 print.src_line++;
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250 }
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251
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252 /* Writes out a traditionally preprocessed file. */
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253 static void
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254 scan_translation_unit_trad (cpp_reader *pfile)
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255 {
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256 while (_cpp_read_logical_line_trad (pfile))
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257 {
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258 size_t len = pfile->out.cur - pfile->out.base;
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259 maybe_print_line (pfile->out.first_line);
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260 fwrite (pfile->out.base, 1, len, print.outf);
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261 print.printed = 1;
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262 if (!CPP_OPTION (pfile, discard_comments))
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263 account_for_newlines (pfile->out.base, len);
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264 }
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265 }
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266
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267 /* If the token read on logical line LINE needs to be output on a
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268 different line to the current one, output the required newlines or
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269 a line marker, and return 1. Otherwise return 0. */
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270 static void
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271 maybe_print_line (source_location src_loc)
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272 {
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273 const struct line_map *map = linemap_lookup (line_table, src_loc);
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274 int src_line = SOURCE_LINE (map, src_loc);
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275 /* End the previous line of text. */
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276 if (print.printed)
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277 {
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278 putc ('\n', print.outf);
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279 print.src_line++;
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280 print.printed = 0;
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281 }
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282
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283 if (src_line >= print.src_line && src_line < print.src_line + 8)
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284 {
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285 while (src_line > print.src_line)
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286 {
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287 putc ('\n', print.outf);
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288 print.src_line++;
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289 }
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290 }
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291 else
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292 print_line (src_loc, "");
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293 }
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294
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295 /* Output a line marker for logical line LINE. Special flags are "1"
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296 or "2" indicating entering or leaving a file. */
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297 static void
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298 print_line (source_location src_loc, const char *special_flags)
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299 {
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300 /* End any previous line of text. */
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301 if (print.printed)
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302 putc ('\n', print.outf);
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303 print.printed = 0;
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304
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305 if (!flag_no_line_commands)
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306 {
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307 const struct line_map *map = linemap_lookup (line_table, src_loc);
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308
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309 size_t to_file_len = strlen (map->to_file);
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310 unsigned char *to_file_quoted =
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311 (unsigned char *) alloca (to_file_len * 4 + 1);
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312 unsigned char *p;
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313
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314 print.src_line = SOURCE_LINE (map, src_loc);
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315
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316 /* cpp_quote_string does not nul-terminate, so we have to do it
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317 ourselves. */
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318 p = cpp_quote_string (to_file_quoted,
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319 (const unsigned char *) map->to_file, to_file_len);
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320 *p = '\0';
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321 fprintf (print.outf, "# %u \"%s\"%s",
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322 print.src_line == 0 ? 1 : print.src_line,
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323 to_file_quoted, special_flags);
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324
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325 if (map->sysp == 2)
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326 fputs (" 3 4", print.outf);
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327 else if (map->sysp == 1)
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328 fputs (" 3", print.outf);
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329
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330 putc ('\n', print.outf);
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331 }
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332 }
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333
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334 /* Called when a line of output is started. TOKEN is the first token
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335 of the line, and at end of file will be CPP_EOF. */
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336 static void
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337 cb_line_change (cpp_reader *pfile, const cpp_token *token,
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338 int parsing_args)
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339 {
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340 source_location src_loc = token->src_loc;
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341
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342 if (define_queue || undef_queue)
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343 dump_queued_macros (pfile);
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344
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345 if (token->type == CPP_EOF || parsing_args)
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346 return;
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347
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348 maybe_print_line (src_loc);
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349 print.prev = 0;
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350 print.source = 0;
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351
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352 /* Supply enough spaces to put this token in its original column,
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353 one space per column greater than 2, since scan_translation_unit
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354 will provide a space if PREV_WHITE. Don't bother trying to
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355 reconstruct tabs; we can't get it right in general, and nothing
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356 ought to care. Some things do care; the fault lies with them. */
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357 if (!CPP_OPTION (pfile, traditional))
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358 {
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359 const struct line_map *map = linemap_lookup (line_table, src_loc);
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360 int spaces = SOURCE_COLUMN (map, src_loc) - 2;
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361 print.printed = 1;
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362
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363 while (-- spaces >= 0)
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364 putc (' ', print.outf);
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365 }
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366 }
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367
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368 static void
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369 cb_ident (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
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370 const cpp_string *str)
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371 {
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372 maybe_print_line (line);
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373 fprintf (print.outf, "#ident %s\n", str->text);
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374 print.src_line++;
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375 }
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376
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377 static void
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378 cb_define (cpp_reader *pfile, source_location line, cpp_hashnode *node)
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379 {
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380 maybe_print_line (line);
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381 fputs ("#define ", print.outf);
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382
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383 /* 'D' is whole definition; 'N' is name only. */
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384 if (flag_dump_macros == 'D')
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385 fputs ((const char *) cpp_macro_definition (pfile, node),
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386 print.outf);
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387 else
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388 fputs ((const char *) NODE_NAME (node), print.outf);
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389
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390 putc ('\n', print.outf);
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391 if (linemap_lookup (line_table, line)->to_line != 0)
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392 print.src_line++;
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393 }
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394
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395 static void
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396 cb_undef (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
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397 cpp_hashnode *node)
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398 {
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399 maybe_print_line (line);
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400 fprintf (print.outf, "#undef %s\n", NODE_NAME (node));
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401 print.src_line++;
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402 }
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403
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404 static void
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405 cb_used_define (cpp_reader *pfile, source_location line ATTRIBUTE_UNUSED,
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406 cpp_hashnode *node)
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407 {
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408 macro_queue *q;
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409 if (node->flags & NODE_BUILTIN)
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410 return;
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411 q = XNEW (macro_queue);
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412 q->macro = xstrdup ((const char *) cpp_macro_definition (pfile, node));
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413 q->next = define_queue;
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414 define_queue = q;
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415 }
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416
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417 static void
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418 cb_used_undef (cpp_reader *pfile ATTRIBUTE_UNUSED,
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419 source_location line ATTRIBUTE_UNUSED,
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420 cpp_hashnode *node)
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421 {
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422 macro_queue *q;
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423 q = XNEW (macro_queue);
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424 q->macro = xstrdup ((const char *) NODE_NAME (node));
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425 q->next = undef_queue;
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426 undef_queue = q;
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427 }
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428
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429 static void
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430 dump_queued_macros (cpp_reader *pfile ATTRIBUTE_UNUSED)
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431 {
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432 macro_queue *q;
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433
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434 /* End the previous line of text. */
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435 if (print.printed)
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436 {
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437 putc ('\n', print.outf);
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438 print.src_line++;
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439 print.printed = 0;
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440 }
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441
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442 for (q = define_queue; q;)
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443 {
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444 macro_queue *oq;
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445 fputs ("#define ", print.outf);
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446 fputs (q->macro, print.outf);
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447 putc ('\n', print.outf);
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448 print.src_line++;
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449 oq = q;
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450 q = q->next;
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451 free (oq->macro);
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452 free (oq);
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453 }
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454 define_queue = NULL;
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455 for (q = undef_queue; q;)
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456 {
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457 macro_queue *oq;
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458 fprintf (print.outf, "#undef %s\n", q->macro);
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459 print.src_line++;
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460 oq = q;
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461 q = q->next;
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462 free (oq->macro);
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463 free (oq);
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464 }
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465 undef_queue = NULL;
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466 }
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467
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468 static void
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469 cb_include (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
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470 const unsigned char *dir, const char *header, int angle_brackets,
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471 const cpp_token **comments)
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472 {
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473 maybe_print_line (line);
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474 if (angle_brackets)
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475 fprintf (print.outf, "#%s <%s>", dir, header);
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476 else
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477 fprintf (print.outf, "#%s \"%s\"", dir, header);
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478
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479 if (comments != NULL)
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480 {
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481 while (*comments != NULL)
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482 {
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483 if ((*comments)->flags & PREV_WHITE)
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484 putc (' ', print.outf);
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485 cpp_output_token (*comments, print.outf);
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486 ++comments;
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487 }
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488 }
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489
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490 putc ('\n', print.outf);
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491 print.src_line++;
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492 }
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493
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494 /* Callback called when -fworking-director and -E to emit working
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495 directory in cpp output file. */
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496
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497 void
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498 pp_dir_change (cpp_reader *pfile ATTRIBUTE_UNUSED, const char *dir)
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499 {
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500 size_t to_file_len = strlen (dir);
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501 unsigned char *to_file_quoted =
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502 (unsigned char *) alloca (to_file_len * 4 + 1);
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503 unsigned char *p;
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504
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505 /* cpp_quote_string does not nul-terminate, so we have to do it ourselves. */
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506 p = cpp_quote_string (to_file_quoted, (const unsigned char *) dir, to_file_len);
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507 *p = '\0';
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508 fprintf (print.outf, "# 1 \"%s//\"\n", to_file_quoted);
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509 }
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510
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511 /* The file name, line number or system header flags have changed, as
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512 described in MAP. */
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513
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514 void
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515 pp_file_change (const struct line_map *map)
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516 {
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517 const char *flags = "";
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518
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519 if (flag_no_line_commands)
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520 return;
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521
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522 if (map != NULL)
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523 {
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524 if (print.first_time)
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525 {
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526 /* Avoid printing foo.i when the main file is foo.c. */
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527 if (!cpp_get_options (parse_in)->preprocessed)
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528 print_line (map->start_location, flags);
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529 print.first_time = 0;
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530 }
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531 else
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532 {
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533 /* Bring current file to correct line when entering a new file. */
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534 if (map->reason == LC_ENTER)
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535 {
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536 const struct line_map *from = INCLUDED_FROM (line_table, map);
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537 maybe_print_line (LAST_SOURCE_LINE_LOCATION (from));
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538 }
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539 if (map->reason == LC_ENTER)
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|
|
540 flags = " 1";
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541 else if (map->reason == LC_LEAVE)
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|
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542 flags = " 2";
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543 print_line (map->start_location, flags);
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|
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544 }
|
|
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545 }
|
|
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546 }
|
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547
|
|
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548 /* Copy a #pragma directive to the preprocessed output. */
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|
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549 static void
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|
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550 cb_def_pragma (cpp_reader *pfile, source_location line)
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|
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551 {
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|
|
552 maybe_print_line (line);
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|
|
553 fputs ("#pragma ", print.outf);
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|
|
554 cpp_output_line (pfile, print.outf);
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|
|
555 print.src_line++;
|
|
|
556 }
|
|
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557
|
|
|
558 /* Dump out the hash table. */
|
|
|
559 static int
|
|
|
560 dump_macro (cpp_reader *pfile, cpp_hashnode *node, void *v ATTRIBUTE_UNUSED)
|
|
|
561 {
|
|
|
562 if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN))
|
|
|
563 {
|
|
|
564 fputs ("#define ", print.outf);
|
|
|
565 fputs ((const char *) cpp_macro_definition (pfile, node),
|
|
|
566 print.outf);
|
|
|
567 putc ('\n', print.outf);
|
|
|
568 print.src_line++;
|
|
|
569 }
|
|
|
570
|
|
|
571 return 1;
|
|
|
572 }
|
|
|
573
|
|
|
574 /* Load in the PCH file NAME, open on FD. It was originally searched for
|
|
|
575 by ORIG_NAME. Also, print out a #include command so that the PCH
|
|
|
576 file can be loaded when the preprocessed output is compiled. */
|
|
|
577
|
|
|
578 static void
|
|
|
579 cb_read_pch (cpp_reader *pfile, const char *name,
|
|
|
580 int fd, const char *orig_name ATTRIBUTE_UNUSED)
|
|
|
581 {
|
|
|
582 c_common_read_pch (pfile, name, fd, orig_name);
|
|
|
583
|
|
|
584 fprintf (print.outf, "#pragma GCC pch_preprocess \"%s\"\n", name);
|
|
|
585 print.src_line++;
|
|
|
586 }
|
