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5222 | serge | 1 | /* input_scrub.c - Break up input buffers into whole numbers of lines. |
2 | Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, |
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3 | 2000, 2001, 2003, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 |
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4 | Free Software Foundation, Inc. |
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5 | |||
6 | This file is part of GAS, the GNU Assembler. |
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7 | |||
8 | GAS is free software; you can redistribute it and/or modify |
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9 | it under the terms of the GNU General Public License as published by |
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10 | the Free Software Foundation; either version 3, or (at your option) |
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11 | any later version. |
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12 | |||
13 | GAS is distributed in the hope that it will be useful, |
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14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | GNU General Public License for more details. |
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17 | |||
18 | You should have received a copy of the GNU General Public License |
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19 | along with GAS; see the file COPYING. If not, write to the Free |
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20 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
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21 | 02110-1301, USA. */ |
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22 | |||
23 | #include "as.h" |
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24 | #include "filenames.h" |
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25 | #include "input-file.h" |
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26 | #include "sb.h" |
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27 | #include "listing.h" |
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28 | |||
29 | /* |
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30 | * O/S independent module to supply buffers of sanitised source code |
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31 | * to rest of assembler. We get sanitised input data of arbitrary length. |
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32 | * We break these buffers on line boundaries, recombine pieces that |
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33 | * were broken across buffers, and return a buffer of full lines to |
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34 | * the caller. |
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35 | * The last partial line begins the next buffer we build and return to caller. |
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36 | * The buffer returned to caller is preceded by BEFORE_STRING and followed |
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37 | * by AFTER_STRING, as sentinels. The last character before AFTER_STRING |
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38 | * is a newline. |
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39 | * Also looks after line numbers, for e.g. error messages. |
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40 | */ |
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41 | |||
42 | /* |
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43 | * We don't care how filthy our buffers are, but our callers assume |
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44 | * that the following sanitation has already been done. |
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45 | * |
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46 | * No comments, reduce a comment to a space. |
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47 | * Reduce a tab to a space unless it is 1st char of line. |
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48 | * All multiple tabs and spaces collapsed into 1 char. Tab only |
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49 | * legal if 1st char of line. |
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50 | * # line file statements converted to .line x;.file y; statements. |
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51 | * Escaped newlines at end of line: remove them but add as many newlines |
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52 | * to end of statement as you removed in the middle, to synch line numbers. |
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53 | */ |
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54 | |||
55 | #define BEFORE_STRING ("\n") |
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56 | #define AFTER_STRING ("\0") /* memcpy of 0 chars might choke. */ |
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57 | #define BEFORE_SIZE (1) |
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58 | #define AFTER_SIZE (1) |
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59 | |||
60 | #ifndef TC_EOL_IN_INSN |
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61 | #define TC_EOL_IN_INSN(P) 0 |
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62 | #endif |
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63 | |||
64 | static char *buffer_start; /*->1st char of full buffer area. */ |
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65 | static char *partial_where; /*->after last full line in buffer. */ |
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66 | static int partial_size; /* >=0. Number of chars in partial line in buffer. */ |
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67 | |||
68 | /* Because we need AFTER_STRING just after last full line, it clobbers |
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69 | 1st part of partial line. So we preserve 1st part of partial line |
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70 | here. */ |
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71 | static char save_source[AFTER_SIZE]; |
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72 | |||
73 | /* What is the largest size buffer that input_file_give_next_buffer() |
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74 | could return to us? */ |
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75 | static unsigned int buffer_length; |
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76 | |||
77 | /* The index into an sb structure we are reading from. -1 if none. */ |
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78 | static size_t sb_index = -1; |
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79 | |||
80 | /* If we are reading from an sb structure, this is it. */ |
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81 | static sb from_sb; |
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82 | |||
83 | /* Should we do a conditional check on from_sb? */ |
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84 | static int from_sb_is_expansion = 1; |
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85 | |||
86 | /* The number of nested sb structures we have included. */ |
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87 | int macro_nest; |
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88 | |||
89 | /* We can have more than one source file open at once, though the info for all |
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90 | but the latest one are saved off in a struct input_save. These files remain |
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91 | open, so we are limited by the number of open files allowed by the |
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92 | underlying OS. We may also sequentially read more than one source file in an |
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93 | assembly. */ |
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94 | |||
95 | /* We must track the physical file and line number for error messages. We also |
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96 | track a "logical" file and line number corresponding to (C?) compiler |
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97 | source line numbers. Whenever we open a file we must fill in |
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98 | physical_input_file. So if it is NULL we have not opened any files yet. */ |
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99 | |||
100 | static char *physical_input_file; |
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101 | static char *logical_input_file; |
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102 | |||
103 | /* 1-origin line number in a source file. */ |
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104 | /* A line ends in '\n' or eof. */ |
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105 | static unsigned int physical_input_line; |
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106 | static int logical_input_line; |
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107 | |||
108 | /* Struct used to save the state of the input handler during include files */ |
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109 | struct input_save { |
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110 | char * buffer_start; |
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111 | char * partial_where; |
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112 | int partial_size; |
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113 | char save_source[AFTER_SIZE]; |
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114 | size_t buffer_length; |
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115 | char * physical_input_file; |
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116 | char * logical_input_file; |
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117 | unsigned int physical_input_line; |
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118 | int logical_input_line; |
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119 | size_t sb_index; |
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120 | sb from_sb; |
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121 | int from_sb_is_expansion; /* Should we do a conditional check? */ |
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122 | struct input_save * next_saved_file; /* Chain of input_saves. */ |
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123 | char * input_file_save; /* Saved state of input routines. */ |
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124 | char * saved_position; /* Caller's saved position in buf. */ |
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125 | }; |
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126 | |||
127 | static struct input_save *input_scrub_push (char *saved_position); |
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128 | static char *input_scrub_pop (struct input_save *arg); |
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129 | |||
130 | /* Saved information about the file that .include'd this one. When we hit EOF, |
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131 | we automatically pop to that file. */ |
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132 | |||
133 | static struct input_save *next_saved_file; |
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134 | |||
135 | /* Push the state of input reading and scrubbing so that we can #include. |
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136 | The return value is a 'void *' (fudged for old compilers) to a save |
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137 | area, which can be restored by passing it to input_scrub_pop(). */ |
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138 | |||
139 | static struct input_save * |
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140 | input_scrub_push (char *saved_position) |
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141 | { |
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142 | register struct input_save *saved; |
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143 | |||
144 | saved = (struct input_save *) xmalloc (sizeof *saved); |
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145 | |||
146 | saved->saved_position = saved_position; |
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147 | saved->buffer_start = buffer_start; |
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148 | saved->partial_where = partial_where; |
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149 | saved->partial_size = partial_size; |
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150 | saved->buffer_length = buffer_length; |
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151 | saved->physical_input_file = physical_input_file; |
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152 | saved->logical_input_file = logical_input_file; |
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153 | saved->physical_input_line = physical_input_line; |
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154 | saved->logical_input_line = logical_input_line; |
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155 | saved->sb_index = sb_index; |
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156 | saved->from_sb = from_sb; |
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157 | saved->from_sb_is_expansion = from_sb_is_expansion; |
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158 | memcpy (saved->save_source, save_source, sizeof (save_source)); |
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159 | saved->next_saved_file = next_saved_file; |
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160 | saved->input_file_save = input_file_push (); |
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161 | |||
162 | input_file_begin (); /* Reinitialize! */ |
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163 | logical_input_line = -1; |
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164 | logical_input_file = (char *) NULL; |
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165 | buffer_length = input_file_buffer_size (); |
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166 | sb_index = -1; |
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167 | |||
168 | buffer_start = (char *) xmalloc ((BEFORE_SIZE + buffer_length |
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169 | + buffer_length + AFTER_SIZE)); |
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170 | memcpy (buffer_start, BEFORE_STRING, (int) BEFORE_SIZE); |
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171 | |||
172 | return saved; |
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173 | } |
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174 | |||
175 | static char * |
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176 | input_scrub_pop (struct input_save *saved) |
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177 | { |
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178 | char *saved_position; |
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179 | |||
180 | input_scrub_end (); /* Finish off old buffer */ |
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181 | |||
182 | input_file_pop (saved->input_file_save); |
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183 | saved_position = saved->saved_position; |
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184 | buffer_start = saved->buffer_start; |
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185 | buffer_length = saved->buffer_length; |
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186 | physical_input_file = saved->physical_input_file; |
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187 | logical_input_file = saved->logical_input_file; |
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188 | physical_input_line = saved->physical_input_line; |
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189 | logical_input_line = saved->logical_input_line; |
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190 | sb_index = saved->sb_index; |
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191 | from_sb = saved->from_sb; |
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192 | from_sb_is_expansion = saved->from_sb_is_expansion; |
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193 | partial_where = saved->partial_where; |
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194 | partial_size = saved->partial_size; |
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195 | next_saved_file = saved->next_saved_file; |
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196 | memcpy (save_source, saved->save_source, sizeof (save_source)); |
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197 | |||
198 | free (saved); |
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199 | return saved_position; |
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200 | } |
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201 | |||
202 | void |
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203 | input_scrub_begin (void) |
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204 | { |
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205 | know (strlen (BEFORE_STRING) == BEFORE_SIZE); |
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206 | know (strlen (AFTER_STRING) == AFTER_SIZE |
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207 | || (AFTER_STRING[0] == '\0' && AFTER_SIZE == 1)); |
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208 | |||
209 | input_file_begin (); |
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210 | |||
211 | buffer_length = input_file_buffer_size (); |
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212 | |||
213 | buffer_start = (char *) xmalloc ((BEFORE_SIZE + buffer_length |
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214 | + buffer_length + AFTER_SIZE)); |
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215 | memcpy (buffer_start, BEFORE_STRING, (int) BEFORE_SIZE); |
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216 | |||
217 | /* Line number things. */ |
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218 | logical_input_line = -1; |
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219 | logical_input_file = (char *) NULL; |
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220 | physical_input_file = NULL; /* No file read yet. */ |
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221 | next_saved_file = NULL; /* At EOF, don't pop to any other file */ |
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222 | do_scrub_begin (flag_m68k_mri); |
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223 | } |
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224 | |||
225 | void |
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226 | input_scrub_end (void) |
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227 | { |
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228 | if (buffer_start) |
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229 | { |
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230 | free (buffer_start); |
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231 | buffer_start = 0; |
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232 | input_file_end (); |
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233 | } |
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234 | } |
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235 | |||
236 | /* Start reading input from a new file. |
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237 | Return start of caller's part of buffer. */ |
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238 | |||
239 | char * |
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240 | input_scrub_new_file (char *filename) |
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241 | { |
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242 | input_file_open (filename, !flag_no_comments); |
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243 | physical_input_file = filename[0] ? filename : _("{standard input}"); |
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244 | physical_input_line = 0; |
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245 | |||
246 | partial_size = 0; |
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247 | return (buffer_start + BEFORE_SIZE); |
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248 | } |
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249 | |||
250 | /* Include a file from the current file. Save our state, cause it to |
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251 | be restored on EOF, and begin handling a new file. Same result as |
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252 | input_scrub_new_file. */ |
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253 | |||
254 | char * |
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255 | input_scrub_include_file (char *filename, char *position) |
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256 | { |
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257 | next_saved_file = input_scrub_push (position); |
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258 | return input_scrub_new_file (filename); |
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259 | } |
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260 | |||
261 | /* Start getting input from an sb structure. This is used when |
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262 | expanding a macro. */ |
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263 | |||
264 | void |
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265 | input_scrub_include_sb (sb *from, char *position, int is_expansion) |
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266 | { |
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267 | int newline; |
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268 | |||
269 | if (macro_nest > max_macro_nest) |
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270 | as_fatal (_("macros nested too deeply")); |
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271 | ++macro_nest; |
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272 | |||
273 | #ifdef md_macro_start |
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274 | if (is_expansion) |
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275 | { |
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276 | md_macro_start (); |
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277 | } |
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278 | #endif |
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279 | |||
280 | next_saved_file = input_scrub_push (position); |
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281 | |||
282 | /* Allocate sufficient space: from->len + optional newline. */ |
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283 | newline = from->len >= 1 && from->ptr[0] != '\n'; |
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284 | sb_build (&from_sb, from->len + newline); |
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285 | from_sb_is_expansion = is_expansion; |
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286 | if (newline) |
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287 | { |
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288 | /* Add the sentinel required by read.c. */ |
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289 | sb_add_char (&from_sb, '\n'); |
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290 | } |
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291 | sb_scrub_and_add_sb (&from_sb, from); |
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292 | |||
293 | /* Make sure the parser looks at defined contents when it scans for |
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294 | e.g. end-of-line at the end of a macro. */ |
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295 | sb_terminate (&from_sb); |
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296 | |||
297 | sb_index = 1; |
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298 | |||
299 | /* These variables are reset by input_scrub_push. Restore them |
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300 | since we are, after all, still at the same point in the file. */ |
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301 | logical_input_line = next_saved_file->logical_input_line; |
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302 | logical_input_file = next_saved_file->logical_input_file; |
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303 | } |
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304 | |||
305 | void |
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306 | input_scrub_close (void) |
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307 | { |
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308 | input_file_close (); |
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309 | physical_input_line = 0; |
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310 | logical_input_line = -1; |
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311 | } |
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312 | |||
313 | char * |
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314 | input_scrub_next_buffer (char **bufp) |
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315 | { |
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316 | register char *limit; /*->just after last char of buffer. */ |
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317 | |||
318 | if (sb_index != (size_t) -1) |
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319 | { |
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320 | if (sb_index >= from_sb.len) |
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321 | { |
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322 | sb_kill (&from_sb); |
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323 | if (from_sb_is_expansion) |
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324 | { |
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325 | cond_finish_check (macro_nest); |
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326 | #ifdef md_macro_end |
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327 | /* Allow the target to clean up per-macro expansion |
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328 | data. */ |
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329 | md_macro_end (); |
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330 | #endif |
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331 | } |
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332 | --macro_nest; |
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333 | partial_where = NULL; |
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334 | if (next_saved_file != NULL) |
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335 | *bufp = input_scrub_pop (next_saved_file); |
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336 | return partial_where; |
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337 | } |
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338 | |||
339 | partial_where = from_sb.ptr + from_sb.len; |
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340 | partial_size = 0; |
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341 | *bufp = from_sb.ptr + sb_index; |
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342 | sb_index = from_sb.len; |
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343 | return partial_where; |
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344 | } |
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345 | |||
346 | *bufp = buffer_start + BEFORE_SIZE; |
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347 | |||
348 | if (partial_size) |
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349 | { |
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350 | memmove (buffer_start + BEFORE_SIZE, partial_where, |
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351 | (unsigned int) partial_size); |
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352 | memcpy (buffer_start + BEFORE_SIZE, save_source, AFTER_SIZE); |
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353 | } |
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354 | limit = input_file_give_next_buffer (buffer_start |
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355 | + BEFORE_SIZE |
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356 | + partial_size); |
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357 | if (limit) |
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358 | { |
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359 | register char *p; /* Find last newline. */ |
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360 | /* Terminate the buffer to avoid confusing TC_EOL_IN_INSN. */ |
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361 | *limit = '\0'; |
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362 | for (p = limit - 1; *p != '\n' || TC_EOL_IN_INSN (p); --p) |
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363 | ; |
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364 | ++p; |
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365 | |||
366 | while (p <= buffer_start + BEFORE_SIZE) |
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367 | { |
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368 | int limoff; |
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369 | |||
370 | limoff = limit - buffer_start; |
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371 | buffer_length += input_file_buffer_size (); |
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372 | buffer_start = (char *) xrealloc (buffer_start, |
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373 | (BEFORE_SIZE |
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374 | + 2 * buffer_length |
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375 | + AFTER_SIZE)); |
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376 | *bufp = buffer_start + BEFORE_SIZE; |
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377 | limit = input_file_give_next_buffer (buffer_start + limoff); |
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378 | |||
379 | if (limit == NULL) |
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380 | { |
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381 | as_warn (_("partial line at end of file ignored")); |
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382 | partial_where = NULL; |
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383 | if (next_saved_file) |
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384 | *bufp = input_scrub_pop (next_saved_file); |
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385 | return NULL; |
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386 | } |
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387 | |||
388 | /* Terminate the buffer to avoid confusing TC_EOL_IN_INSN. */ |
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389 | *limit = '\0'; |
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390 | for (p = limit - 1; *p != '\n' || TC_EOL_IN_INSN (p); --p) |
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391 | ; |
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392 | ++p; |
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393 | } |
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394 | |||
395 | partial_where = p; |
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396 | partial_size = limit - p; |
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397 | memcpy (save_source, partial_where, (int) AFTER_SIZE); |
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398 | memcpy (partial_where, AFTER_STRING, (int) AFTER_SIZE); |
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399 | } |
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400 | else |
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401 | { |
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402 | partial_where = 0; |
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403 | if (partial_size > 0) |
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404 | { |
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405 | as_warn (_("partial line at end of file ignored")); |
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406 | } |
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407 | |||
408 | /* Tell the listing we've finished the file. */ |
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409 | LISTING_EOF (); |
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410 | |||
411 | /* If we should pop to another file at EOF, do it. */ |
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412 | if (next_saved_file) |
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413 | { |
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414 | *bufp = input_scrub_pop (next_saved_file); /* Pop state */ |
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415 | /* partial_where is now correct to return, since we popped it. */ |
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416 | } |
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417 | } |
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418 | return (partial_where); |
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419 | } |
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420 | |||
421 | /* The remaining part of this file deals with line numbers, error |
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422 | messages and so on. Return TRUE if we opened any file. */ |
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423 | |||
424 | int |
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425 | seen_at_least_1_file (void) |
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426 | { |
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427 | return (physical_input_file != NULL); |
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428 | } |
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429 | |||
430 | void |
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431 | bump_line_counters (void) |
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432 | { |
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433 | if (sb_index == (size_t) -1) |
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434 | { |
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435 | ++physical_input_line; |
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436 | if (logical_input_line >= 0) |
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437 | ++logical_input_line; |
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438 | } |
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439 | } |
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440 | |||
441 | /* Tells us what the new logical line number and file are. |
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442 | If the line_number is -1, we don't change the current logical line |
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443 | number. If it is -2, we decrement the logical line number (this is |
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444 | to support the .appfile pseudo-op inserted into the stream by |
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445 | do_scrub_chars). |
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446 | If the fname is NULL, we don't change the current logical file name. |
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447 | Returns nonzero if the filename actually changes. */ |
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448 | |||
449 | int |
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450 | new_logical_line_flags (char *fname, /* DON'T destroy it! We point to it! */ |
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451 | int line_number, |
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452 | int flags) |
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453 | { |
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454 | switch (flags) |
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455 | { |
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456 | case 0: |
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457 | break; |
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458 | case 1: |
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459 | if (line_number != -1) |
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460 | abort (); |
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461 | break; |
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462 | case 1 << 1: |
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463 | case 1 << 2: |
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464 | /* FIXME: we could check that include nesting is correct. */ |
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465 | break; |
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466 | default: |
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467 | abort (); |
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468 | } |
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469 | |||
470 | if (line_number >= 0) |
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471 | logical_input_line = line_number; |
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472 | else if (line_number == -1 && fname && !*fname && (flags & (1 << 2))) |
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473 | { |
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474 | logical_input_file = physical_input_file; |
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475 | logical_input_line = physical_input_line; |
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476 | fname = NULL; |
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477 | } |
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478 | |||
479 | if (fname |
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480 | && (logical_input_file == NULL |
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481 | || filename_cmp (logical_input_file, fname))) |
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482 | { |
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483 | logical_input_file = fname; |
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484 | return 1; |
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485 | } |
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486 | else |
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487 | return 0; |
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488 | } |
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489 | |||
490 | int |
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491 | new_logical_line (char *fname, int line_number) |
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492 | { |
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493 | return new_logical_line_flags (fname, line_number, 0); |
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494 | } |
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495 | |||
496 | |||
497 | /* Return the current file name and line number. |
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498 | namep should be char * const *, but there are compilers which screw |
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499 | up declarations like that, and it's easier to avoid it. */ |
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500 | |||
501 | void |
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502 | as_where (char **namep, unsigned int *linep) |
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503 | { |
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504 | if (logical_input_file != NULL |
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505 | && (linep == NULL || logical_input_line >= 0)) |
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506 | { |
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507 | *namep = logical_input_file; |
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508 | if (linep != NULL) |
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509 | *linep = logical_input_line; |
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510 | } |
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511 | else if (physical_input_file != NULL) |
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512 | { |
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513 | *namep = physical_input_file; |
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514 | if (linep != NULL) |
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515 | *linep = physical_input_line; |
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516 | } |
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517 | else |
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518 | { |
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519 | *namep = 0; |
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520 | if (linep != NULL) |
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521 | *linep = 0; |
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522 | } |
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523 | }><>><>><>=> |