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5222 | serge | 1 | /* dwarf2dbg.c - DWARF2 debug support |
2 | Copyright 1999-2013 Free Software Foundation, Inc. |
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3 | Contributed by David Mosberger-Tang |
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4 | |||
5 | This file is part of GAS, the GNU Assembler. |
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6 | |||
7 | GAS is free software; you can redistribute it and/or modify |
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8 | it under the terms of the GNU General Public License as published by |
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9 | the Free Software Foundation; either version 3, or (at your option) |
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10 | any later version. |
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11 | |||
12 | GAS is distributed in the hope that it will be useful, |
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13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | GNU General Public License for more details. |
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16 | |||
17 | You should have received a copy of the GNU General Public License |
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18 | along with GAS; see the file COPYING. If not, write to the Free |
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19 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
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20 | 02110-1301, USA. */ |
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21 | |||
22 | /* Logical line numbers can be controlled by the compiler via the |
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23 | following directives: |
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24 | |||
25 | .file FILENO "file.c" |
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26 | .loc FILENO LINENO [COLUMN] [basic_block] [prologue_end] \ |
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27 | [epilogue_begin] [is_stmt VALUE] [isa VALUE] \ |
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28 | [discriminator VALUE] |
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29 | */ |
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30 | |||
31 | #include "as.h" |
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32 | #include "safe-ctype.h" |
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33 | |||
34 | #ifdef HAVE_LIMITS_H |
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35 | #include |
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36 | #else |
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37 | #ifdef HAVE_SYS_PARAM_H |
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38 | #include |
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39 | #endif |
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40 | #ifndef INT_MAX |
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41 | #define INT_MAX (int) (((unsigned) (-1)) >> 1) |
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42 | #endif |
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43 | #endif |
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44 | |||
45 | #include "dwarf2dbg.h" |
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46 | #include |
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47 | |||
48 | #ifdef HAVE_DOS_BASED_FILE_SYSTEM |
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49 | /* We need to decide which character to use as a directory separator. |
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50 | Just because HAVE_DOS_BASED_FILE_SYSTEM is defined, it does not |
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51 | necessarily mean that the backslash character is the one to use. |
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52 | Some environments, eg Cygwin, can support both naming conventions. |
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53 | So we use the heuristic that we only need to use the backslash if |
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54 | the path is an absolute path starting with a DOS style drive |
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55 | selector. eg C: or D: */ |
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56 | # define INSERT_DIR_SEPARATOR(string, offset) \ |
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57 | do \ |
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58 | { \ |
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59 | if (offset > 1 \ |
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60 | && string[0] != 0 \ |
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61 | && string[1] == ':') \ |
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62 | string [offset] = '\\'; \ |
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63 | else \ |
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64 | string [offset] = '/'; \ |
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65 | } \ |
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66 | while (0) |
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67 | #else |
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68 | # define INSERT_DIR_SEPARATOR(string, offset) string[offset] = '/' |
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69 | #endif |
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70 | |||
71 | #ifndef DWARF2_FORMAT |
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72 | # define DWARF2_FORMAT(SEC) dwarf2_format_32bit |
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73 | #endif |
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74 | |||
75 | #ifndef DWARF2_ADDR_SIZE |
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76 | # define DWARF2_ADDR_SIZE(bfd) (bfd_arch_bits_per_address (bfd) / 8) |
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77 | #endif |
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78 | |||
79 | #ifndef DWARF2_FILE_NAME |
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80 | #define DWARF2_FILE_NAME(FILENAME, DIRNAME) FILENAME |
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81 | #endif |
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82 | |||
83 | #ifndef DWARF2_FILE_TIME_NAME |
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84 | #define DWARF2_FILE_TIME_NAME(FILENAME,DIRNAME) 0 |
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85 | #endif |
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86 | |||
87 | #ifndef DWARF2_FILE_SIZE_NAME |
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88 | #define DWARF2_FILE_SIZE_NAME(FILENAME,DIRNAME) 0 |
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89 | #endif |
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90 | |||
91 | #ifndef DWARF2_VERSION |
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92 | #define DWARF2_VERSION 2 |
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93 | #endif |
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94 | |||
95 | /* The .debug_aranges version has been 2 in DWARF version 2, 3 and 4. */ |
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96 | #ifndef DWARF2_ARANGES_VERSION |
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97 | #define DWARF2_ARANGES_VERSION 2 |
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98 | #endif |
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99 | |||
100 | /* This implementation output version 2 .debug_line information. */ |
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101 | #ifndef DWARF2_LINE_VERSION |
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102 | #define DWARF2_LINE_VERSION 2 |
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103 | #endif |
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104 | |||
105 | #include "subsegs.h" |
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106 | |||
107 | #include "dwarf2.h" |
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108 | |||
109 | /* Since we can't generate the prolog until the body is complete, we |
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110 | use three different subsegments for .debug_line: one holding the |
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111 | prolog, one for the directory and filename info, and one for the |
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112 | body ("statement program"). */ |
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113 | #define DL_PROLOG 0 |
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114 | #define DL_FILES 1 |
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115 | #define DL_BODY 2 |
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116 | |||
117 | /* If linker relaxation might change offsets in the code, the DWARF special |
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118 | opcodes and variable-length operands cannot be used. If this macro is |
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119 | nonzero, use the DW_LNS_fixed_advance_pc opcode instead. */ |
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120 | #ifndef DWARF2_USE_FIXED_ADVANCE_PC |
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121 | # define DWARF2_USE_FIXED_ADVANCE_PC linkrelax |
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122 | #endif |
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123 | |||
124 | /* First special line opcde - leave room for the standard opcodes. |
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125 | Note: If you want to change this, you'll have to update the |
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126 | "standard_opcode_lengths" table that is emitted below in |
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127 | out_debug_line(). */ |
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128 | #define DWARF2_LINE_OPCODE_BASE 13 |
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129 | |||
130 | #ifndef DWARF2_LINE_BASE |
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131 | /* Minimum line offset in a special line info. opcode. This value |
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132 | was chosen to give a reasonable range of values. */ |
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133 | # define DWARF2_LINE_BASE -5 |
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134 | #endif |
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135 | |||
136 | /* Range of line offsets in a special line info. opcode. */ |
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137 | #ifndef DWARF2_LINE_RANGE |
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138 | # define DWARF2_LINE_RANGE 14 |
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139 | #endif |
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140 | |||
141 | #ifndef DWARF2_LINE_MIN_INSN_LENGTH |
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142 | /* Define the architecture-dependent minimum instruction length (in |
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143 | bytes). This value should be rather too small than too big. */ |
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144 | # define DWARF2_LINE_MIN_INSN_LENGTH 1 |
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145 | #endif |
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146 | |||
147 | /* Flag that indicates the initial value of the is_stmt_start flag. */ |
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148 | #define DWARF2_LINE_DEFAULT_IS_STMT 1 |
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149 | |||
150 | /* Given a special op, return the line skip amount. */ |
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151 | #define SPECIAL_LINE(op) \ |
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152 | (((op) - DWARF2_LINE_OPCODE_BASE)%DWARF2_LINE_RANGE + DWARF2_LINE_BASE) |
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153 | |||
154 | /* Given a special op, return the address skip amount (in units of |
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155 | DWARF2_LINE_MIN_INSN_LENGTH. */ |
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156 | #define SPECIAL_ADDR(op) (((op) - DWARF2_LINE_OPCODE_BASE)/DWARF2_LINE_RANGE) |
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157 | |||
158 | /* The maximum address skip amount that can be encoded with a special op. */ |
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159 | #define MAX_SPECIAL_ADDR_DELTA SPECIAL_ADDR(255) |
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160 | |||
161 | struct line_entry { |
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162 | struct line_entry *next; |
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163 | symbolS *label; |
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164 | struct dwarf2_line_info loc; |
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165 | }; |
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166 | |||
167 | struct line_subseg { |
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168 | struct line_subseg *next; |
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169 | subsegT subseg; |
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170 | struct line_entry *head; |
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171 | struct line_entry **ptail; |
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172 | struct line_entry **pmove_tail; |
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173 | }; |
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174 | |||
175 | struct line_seg { |
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176 | struct line_seg *next; |
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177 | segT seg; |
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178 | struct line_subseg *head; |
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179 | symbolS *text_start; |
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180 | symbolS *text_end; |
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181 | }; |
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182 | |||
183 | /* Collects data for all line table entries during assembly. */ |
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184 | static struct line_seg *all_segs; |
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185 | /* Hash used to quickly lookup a segment by name, avoiding the need to search |
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186 | through the all_segs list. */ |
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187 | static struct hash_control *all_segs_hash; |
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188 | static struct line_seg **last_seg_ptr; |
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189 | |||
190 | struct file_entry { |
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191 | const char *filename; |
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192 | unsigned int dir; |
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193 | }; |
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194 | |||
195 | /* Table of files used by .debug_line. */ |
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196 | static struct file_entry *files; |
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197 | static unsigned int files_in_use; |
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198 | static unsigned int files_allocated; |
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199 | |||
200 | /* Table of directories used by .debug_line. */ |
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201 | static char **dirs; |
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202 | static unsigned int dirs_in_use; |
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203 | static unsigned int dirs_allocated; |
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204 | |||
205 | /* TRUE when we've seen a .loc directive recently. Used to avoid |
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206 | doing work when there's nothing to do. */ |
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207 | bfd_boolean dwarf2_loc_directive_seen; |
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208 | |||
209 | /* TRUE when we're supposed to set the basic block mark whenever a |
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210 | label is seen. */ |
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211 | bfd_boolean dwarf2_loc_mark_labels; |
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212 | |||
213 | /* Current location as indicated by the most recent .loc directive. */ |
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214 | static struct dwarf2_line_info current = { |
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215 | 1, 1, 0, 0, |
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216 | DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0, |
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217 | |||
218 | }; |
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219 | |||
220 | /* The size of an address on the target. */ |
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221 | static unsigned int sizeof_address; |
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222 | |||
223 | static unsigned int get_filenum (const char *, unsigned int); |
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224 | |||
225 | #ifndef TC_DWARF2_EMIT_OFFSET |
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226 | #define TC_DWARF2_EMIT_OFFSET generic_dwarf2_emit_offset |
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227 | |||
228 | /* Create an offset to .dwarf2_*. */ |
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229 | |||
230 | static void |
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231 | generic_dwarf2_emit_offset (symbolS *symbol, unsigned int size) |
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232 | { |
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233 | expressionS exp; |
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234 | |||
235 | exp.X_op = O_symbol; |
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236 | exp.X_add_symbol = symbol; |
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237 | exp.X_add_number = 0; |
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238 | emit_expr (&exp, size); |
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239 | } |
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240 | #endif |
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241 | |||
242 | /* Find or create (if CREATE_P) an entry for SEG+SUBSEG in ALL_SEGS. */ |
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243 | |||
244 | static struct line_subseg * |
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245 | get_line_subseg (segT seg, subsegT subseg, bfd_boolean create_p) |
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246 | { |
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247 | static segT last_seg; |
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248 | static subsegT last_subseg; |
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249 | static struct line_subseg *last_line_subseg; |
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250 | |||
251 | struct line_seg *s; |
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252 | struct line_subseg **pss, *lss; |
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253 | |||
254 | if (seg == last_seg && subseg == last_subseg) |
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255 | return last_line_subseg; |
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256 | |||
257 | s = (struct line_seg *) hash_find (all_segs_hash, seg->name); |
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258 | if (s == NULL) |
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259 | { |
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260 | if (!create_p) |
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261 | return NULL; |
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262 | |||
263 | s = (struct line_seg *) xmalloc (sizeof (*s)); |
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264 | s->next = NULL; |
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265 | s->seg = seg; |
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266 | s->head = NULL; |
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267 | *last_seg_ptr = s; |
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268 | last_seg_ptr = &s->next; |
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269 | hash_insert (all_segs_hash, seg->name, s); |
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270 | } |
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271 | gas_assert (seg == s->seg); |
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272 | |||
273 | for (pss = &s->head; (lss = *pss) != NULL ; pss = &lss->next) |
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274 | { |
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275 | if (lss->subseg == subseg) |
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276 | goto found_subseg; |
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277 | if (lss->subseg > subseg) |
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278 | break; |
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279 | } |
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280 | |||
281 | lss = (struct line_subseg *) xmalloc (sizeof (*lss)); |
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282 | lss->next = *pss; |
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283 | lss->subseg = subseg; |
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284 | lss->head = NULL; |
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285 | lss->ptail = &lss->head; |
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286 | lss->pmove_tail = &lss->head; |
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287 | *pss = lss; |
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288 | |||
289 | found_subseg: |
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290 | last_seg = seg; |
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291 | last_subseg = subseg; |
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292 | last_line_subseg = lss; |
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293 | |||
294 | return lss; |
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295 | } |
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296 | |||
297 | /* Record an entry for LOC occurring at LABEL. */ |
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298 | |||
299 | static void |
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300 | dwarf2_gen_line_info_1 (symbolS *label, struct dwarf2_line_info *loc) |
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301 | { |
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302 | struct line_subseg *lss; |
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303 | struct line_entry *e; |
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304 | |||
305 | e = (struct line_entry *) xmalloc (sizeof (*e)); |
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306 | e->next = NULL; |
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307 | e->label = label; |
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308 | e->loc = *loc; |
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309 | |||
310 | lss = get_line_subseg (now_seg, now_subseg, TRUE); |
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311 | *lss->ptail = e; |
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312 | lss->ptail = &e->next; |
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313 | } |
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314 | |||
315 | /* Record an entry for LOC occurring at OFS within the current fragment. */ |
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316 | |||
317 | void |
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318 | dwarf2_gen_line_info (addressT ofs, struct dwarf2_line_info *loc) |
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319 | { |
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320 | static unsigned int line = -1; |
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321 | static unsigned int filenum = -1; |
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322 | |||
323 | symbolS *sym; |
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324 | |||
325 | /* Early out for as-yet incomplete location information. */ |
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326 | if (loc->filenum == 0 || loc->line == 0) |
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327 | return; |
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328 | |||
329 | /* Don't emit sequences of line symbols for the same line when the |
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330 | symbols apply to assembler code. It is necessary to emit |
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331 | duplicate line symbols when a compiler asks for them, because GDB |
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332 | uses them to determine the end of the prologue. */ |
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333 | if (debug_type == DEBUG_DWARF2 |
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334 | && line == loc->line && filenum == loc->filenum) |
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335 | return; |
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336 | |||
337 | line = loc->line; |
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338 | filenum = loc->filenum; |
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339 | |||
340 | if (linkrelax) |
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341 | { |
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342 | char name[120]; |
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343 | |||
344 | /* Use a non-fake name for the line number location, |
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345 | so that it can be referred to by relocations. */ |
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346 | sprintf (name, ".Loc.%u.%u", line, filenum); |
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347 | sym = symbol_new (name, now_seg, ofs, frag_now); |
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348 | } |
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349 | else |
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350 | sym = symbol_temp_new (now_seg, ofs, frag_now); |
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351 | dwarf2_gen_line_info_1 (sym, loc); |
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352 | } |
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353 | |||
354 | /* Returns the current source information. If .file directives have |
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355 | been encountered, the info for the corresponding source file is |
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356 | returned. Otherwise, the info for the assembly source file is |
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357 | returned. */ |
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358 | |||
359 | void |
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360 | dwarf2_where (struct dwarf2_line_info *line) |
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361 | { |
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362 | if (debug_type == DEBUG_DWARF2) |
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363 | { |
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364 | char *filename; |
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365 | as_where (&filename, &line->line); |
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366 | line->filenum = get_filenum (filename, 0); |
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367 | line->column = 0; |
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368 | line->flags = DWARF2_FLAG_IS_STMT; |
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369 | line->isa = current.isa; |
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370 | line->discriminator = current.discriminator; |
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371 | } |
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372 | else |
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373 | *line = current; |
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374 | } |
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375 | |||
376 | /* A hook to allow the target backend to inform the line number state |
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377 | machine of isa changes when assembler debug info is enabled. */ |
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378 | |||
379 | void |
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380 | dwarf2_set_isa (unsigned int isa) |
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381 | { |
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382 | current.isa = isa; |
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383 | } |
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384 | |||
385 | /* Called for each machine instruction, or relatively atomic group of |
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386 | machine instructions (ie built-in macro). The instruction or group |
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387 | is SIZE bytes in length. If dwarf2 line number generation is called |
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388 | for, emit a line statement appropriately. */ |
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389 | |||
390 | void |
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391 | dwarf2_emit_insn (int size) |
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392 | { |
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393 | struct dwarf2_line_info loc; |
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394 | |||
395 | if (!dwarf2_loc_directive_seen && debug_type != DEBUG_DWARF2) |
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396 | return; |
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397 | |||
398 | dwarf2_where (&loc); |
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399 | |||
400 | dwarf2_gen_line_info (frag_now_fix () - size, &loc); |
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401 | dwarf2_consume_line_info (); |
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402 | } |
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403 | |||
404 | /* Move all previously-emitted line entries for the current position by |
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405 | DELTA bytes. This function cannot be used to move the same entries |
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406 | twice. */ |
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407 | |||
408 | void |
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409 | dwarf2_move_insn (int delta) |
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410 | { |
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411 | struct line_subseg *lss; |
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412 | struct line_entry *e; |
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413 | valueT now; |
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414 | |||
415 | if (delta == 0) |
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416 | return; |
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417 | |||
418 | lss = get_line_subseg (now_seg, now_subseg, FALSE); |
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419 | if (!lss) |
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420 | return; |
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421 | |||
422 | now = frag_now_fix (); |
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423 | while ((e = *lss->pmove_tail)) |
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424 | { |
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425 | if (S_GET_VALUE (e->label) == now) |
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426 | S_SET_VALUE (e->label, now + delta); |
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427 | lss->pmove_tail = &e->next; |
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428 | } |
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429 | } |
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430 | |||
431 | /* Called after the current line information has been either used with |
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432 | dwarf2_gen_line_info or saved with a machine instruction for later use. |
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433 | This resets the state of the line number information to reflect that |
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434 | it has been used. */ |
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435 | |||
436 | void |
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437 | dwarf2_consume_line_info (void) |
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438 | { |
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439 | /* Unless we generate DWARF2 debugging information for each |
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440 | assembler line, we only emit one line symbol for one LOC. */ |
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441 | dwarf2_loc_directive_seen = FALSE; |
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442 | |||
443 | current.flags &= ~(DWARF2_FLAG_BASIC_BLOCK |
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444 | | DWARF2_FLAG_PROLOGUE_END |
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445 | | DWARF2_FLAG_EPILOGUE_BEGIN); |
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446 | current.discriminator = 0; |
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447 | } |
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448 | |||
449 | /* Called for each (preferably code) label. If dwarf2_loc_mark_labels |
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450 | is enabled, emit a basic block marker. */ |
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451 | |||
452 | void |
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453 | dwarf2_emit_label (symbolS *label) |
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454 | { |
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455 | struct dwarf2_line_info loc; |
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456 | |||
457 | if (!dwarf2_loc_mark_labels) |
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458 | return; |
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459 | if (S_GET_SEGMENT (label) != now_seg) |
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460 | return; |
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461 | if (!(bfd_get_section_flags (stdoutput, now_seg) & SEC_CODE)) |
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462 | return; |
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463 | if (files_in_use == 0 && debug_type != DEBUG_DWARF2) |
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464 | return; |
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465 | |||
466 | dwarf2_where (&loc); |
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467 | |||
468 | loc.flags |= DWARF2_FLAG_BASIC_BLOCK; |
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469 | |||
470 | dwarf2_gen_line_info_1 (label, &loc); |
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471 | dwarf2_consume_line_info (); |
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472 | } |
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473 | |||
474 | /* Get a .debug_line file number for FILENAME. If NUM is nonzero, |
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475 | allocate it on that file table slot, otherwise return the first |
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476 | empty one. */ |
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477 | |||
478 | static unsigned int |
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479 | get_filenum (const char *filename, unsigned int num) |
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480 | { |
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481 | static unsigned int last_used, last_used_dir_len; |
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482 | const char *file; |
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483 | size_t dir_len; |
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484 | unsigned int i, dir; |
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485 | |||
486 | if (num == 0 && last_used) |
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487 | { |
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488 | if (! files[last_used].dir |
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489 | && filename_cmp (filename, files[last_used].filename) == 0) |
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490 | return last_used; |
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491 | if (files[last_used].dir |
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492 | && filename_ncmp (filename, dirs[files[last_used].dir], |
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493 | last_used_dir_len) == 0 |
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494 | && IS_DIR_SEPARATOR (filename [last_used_dir_len]) |
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495 | && filename_cmp (filename + last_used_dir_len + 1, |
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496 | files[last_used].filename) == 0) |
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497 | return last_used; |
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498 | } |
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499 | |||
500 | file = lbasename (filename); |
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501 | /* Don't make empty string from / or A: from A:/ . */ |
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502 | #ifdef HAVE_DOS_BASED_FILE_SYSTEM |
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503 | if (file <= filename + 3) |
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504 | file = filename; |
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505 | #else |
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506 | if (file == filename + 1) |
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507 | file = filename; |
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508 | #endif |
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509 | dir_len = file - filename; |
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510 | |||
511 | dir = 0; |
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512 | if (dir_len) |
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513 | { |
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514 | #ifndef DWARF2_DIR_SHOULD_END_WITH_SEPARATOR |
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515 | --dir_len; |
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516 | #endif |
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517 | for (dir = 1; dir < dirs_in_use; ++dir) |
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518 | if (filename_ncmp (filename, dirs[dir], dir_len) == 0 |
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519 | && dirs[dir][dir_len] == '\0') |
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520 | break; |
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521 | |||
522 | if (dir >= dirs_in_use) |
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523 | { |
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524 | if (dir >= dirs_allocated) |
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525 | { |
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526 | dirs_allocated = dir + 32; |
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527 | dirs = (char **) |
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528 | xrealloc (dirs, (dir + 32) * sizeof (const char *)); |
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529 | } |
||
530 | |||
531 | dirs[dir] = (char *) xmalloc (dir_len + 1); |
||
532 | memcpy (dirs[dir], filename, dir_len); |
||
533 | dirs[dir][dir_len] = '\0'; |
||
534 | dirs_in_use = dir + 1; |
||
535 | } |
||
536 | } |
||
537 | |||
538 | if (num == 0) |
||
539 | { |
||
540 | for (i = 1; i < files_in_use; ++i) |
||
541 | if (files[i].dir == dir |
||
542 | && files[i].filename |
||
543 | && filename_cmp (file, files[i].filename) == 0) |
||
544 | { |
||
545 | last_used = i; |
||
546 | last_used_dir_len = dir_len; |
||
547 | return i; |
||
548 | } |
||
549 | } |
||
550 | else |
||
551 | i = num; |
||
552 | |||
553 | if (i >= files_allocated) |
||
554 | { |
||
555 | unsigned int old = files_allocated; |
||
556 | |||
557 | files_allocated = i + 32; |
||
558 | files = (struct file_entry *) |
||
559 | xrealloc (files, (i + 32) * sizeof (struct file_entry)); |
||
560 | |||
561 | memset (files + old, 0, (i + 32 - old) * sizeof (struct file_entry)); |
||
562 | } |
||
563 | |||
564 | files[i].filename = num ? file : xstrdup (file); |
||
565 | files[i].dir = dir; |
||
566 | if (files_in_use < i + 1) |
||
567 | files_in_use = i + 1; |
||
568 | last_used = i; |
||
569 | last_used_dir_len = dir_len; |
||
570 | |||
571 | return i; |
||
572 | } |
||
573 | |||
574 | /* Handle two forms of .file directive: |
||
575 | - Pass .file "source.c" to s_app_file |
||
576 | - Handle .file 1 "source.c" by adding an entry to the DWARF-2 file table |
||
577 | |||
578 | If an entry is added to the file table, return a pointer to the filename. */ |
||
579 | |||
580 | char * |
||
581 | dwarf2_directive_file (int dummy ATTRIBUTE_UNUSED) |
||
582 | { |
||
583 | offsetT num; |
||
584 | char *filename; |
||
585 | int filename_len; |
||
586 | |||
587 | /* Continue to accept a bare string and pass it off. */ |
||
588 | SKIP_WHITESPACE (); |
||
589 | if (*input_line_pointer == '"') |
||
590 | { |
||
591 | s_app_file (0); |
||
592 | return NULL; |
||
593 | } |
||
594 | |||
595 | num = get_absolute_expression (); |
||
596 | filename = demand_copy_C_string (&filename_len); |
||
597 | if (filename == NULL) |
||
598 | return NULL; |
||
599 | demand_empty_rest_of_line (); |
||
600 | |||
601 | if (num < 1) |
||
602 | { |
||
603 | as_bad (_("file number less than one")); |
||
604 | return NULL; |
||
605 | } |
||
606 | |||
607 | /* A .file directive implies compiler generated debug information is |
||
608 | being supplied. Turn off gas generated debug info. */ |
||
609 | debug_type = DEBUG_NONE; |
||
610 | |||
611 | if (num < (int) files_in_use && files[num].filename != 0) |
||
612 | { |
||
613 | as_bad (_("file number %ld already allocated"), (long) num); |
||
614 | return NULL; |
||
615 | } |
||
616 | |||
617 | get_filenum (filename, num); |
||
618 | |||
619 | return filename; |
||
620 | } |
||
621 | |||
622 | void |
||
623 | dwarf2_directive_loc (int dummy ATTRIBUTE_UNUSED) |
||
624 | { |
||
625 | offsetT filenum, line; |
||
626 | |||
627 | /* If we see two .loc directives in a row, force the first one to be |
||
628 | output now. */ |
||
629 | if (dwarf2_loc_directive_seen) |
||
630 | dwarf2_emit_insn (0); |
||
631 | |||
632 | filenum = get_absolute_expression (); |
||
633 | SKIP_WHITESPACE (); |
||
634 | line = get_absolute_expression (); |
||
635 | |||
636 | if (filenum < 1) |
||
637 | { |
||
638 | as_bad (_("file number less than one")); |
||
639 | return; |
||
640 | } |
||
641 | if (filenum >= (int) files_in_use || files[filenum].filename == 0) |
||
642 | { |
||
643 | as_bad (_("unassigned file number %ld"), (long) filenum); |
||
644 | return; |
||
645 | } |
||
646 | |||
647 | current.filenum = filenum; |
||
648 | current.line = line; |
||
649 | current.discriminator = 0; |
||
650 | |||
651 | #ifndef NO_LISTING |
||
652 | if (listing) |
||
653 | { |
||
654 | if (files[filenum].dir) |
||
655 | { |
||
656 | size_t dir_len = strlen (dirs[files[filenum].dir]); |
||
657 | size_t file_len = strlen (files[filenum].filename); |
||
658 | char *cp = (char *) alloca (dir_len + 1 + file_len + 1); |
||
659 | |||
660 | memcpy (cp, dirs[files[filenum].dir], dir_len); |
||
661 | INSERT_DIR_SEPARATOR (cp, dir_len); |
||
662 | memcpy (cp + dir_len + 1, files[filenum].filename, file_len); |
||
663 | cp[dir_len + file_len + 1] = '\0'; |
||
664 | listing_source_file (cp); |
||
665 | } |
||
666 | else |
||
667 | listing_source_file (files[filenum].filename); |
||
668 | listing_source_line (line); |
||
669 | } |
||
670 | #endif |
||
671 | |||
672 | SKIP_WHITESPACE (); |
||
673 | if (ISDIGIT (*input_line_pointer)) |
||
674 | { |
||
675 | current.column = get_absolute_expression (); |
||
676 | SKIP_WHITESPACE (); |
||
677 | } |
||
678 | |||
679 | while (ISALPHA (*input_line_pointer)) |
||
680 | { |
||
681 | char *p, c; |
||
682 | offsetT value; |
||
683 | |||
684 | p = input_line_pointer; |
||
685 | c = get_symbol_end (); |
||
686 | |||
687 | if (strcmp (p, "basic_block") == 0) |
||
688 | { |
||
689 | current.flags |= DWARF2_FLAG_BASIC_BLOCK; |
||
690 | *input_line_pointer = c; |
||
691 | } |
||
692 | else if (strcmp (p, "prologue_end") == 0) |
||
693 | { |
||
694 | current.flags |= DWARF2_FLAG_PROLOGUE_END; |
||
695 | *input_line_pointer = c; |
||
696 | } |
||
697 | else if (strcmp (p, "epilogue_begin") == 0) |
||
698 | { |
||
699 | current.flags |= DWARF2_FLAG_EPILOGUE_BEGIN; |
||
700 | *input_line_pointer = c; |
||
701 | } |
||
702 | else if (strcmp (p, "is_stmt") == 0) |
||
703 | { |
||
704 | *input_line_pointer = c; |
||
705 | value = get_absolute_expression (); |
||
706 | if (value == 0) |
||
707 | current.flags &= ~DWARF2_FLAG_IS_STMT; |
||
708 | else if (value == 1) |
||
709 | current.flags |= DWARF2_FLAG_IS_STMT; |
||
710 | else |
||
711 | { |
||
712 | as_bad (_("is_stmt value not 0 or 1")); |
||
713 | return; |
||
714 | } |
||
715 | } |
||
716 | else if (strcmp (p, "isa") == 0) |
||
717 | { |
||
718 | *input_line_pointer = c; |
||
719 | value = get_absolute_expression (); |
||
720 | if (value >= 0) |
||
721 | current.isa = value; |
||
722 | else |
||
723 | { |
||
724 | as_bad (_("isa number less than zero")); |
||
725 | return; |
||
726 | } |
||
727 | } |
||
728 | else if (strcmp (p, "discriminator") == 0) |
||
729 | { |
||
730 | *input_line_pointer = c; |
||
731 | value = get_absolute_expression (); |
||
732 | if (value >= 0) |
||
733 | current.discriminator = value; |
||
734 | else |
||
735 | { |
||
736 | as_bad (_("discriminator less than zero")); |
||
737 | return; |
||
738 | } |
||
739 | } |
||
740 | else |
||
741 | { |
||
742 | as_bad (_("unknown .loc sub-directive `%s'"), p); |
||
743 | *input_line_pointer = c; |
||
744 | return; |
||
745 | } |
||
746 | |||
747 | SKIP_WHITESPACE (); |
||
748 | } |
||
749 | |||
750 | demand_empty_rest_of_line (); |
||
751 | dwarf2_loc_directive_seen = TRUE; |
||
752 | debug_type = DEBUG_NONE; |
||
753 | } |
||
754 | |||
755 | void |
||
756 | dwarf2_directive_loc_mark_labels (int dummy ATTRIBUTE_UNUSED) |
||
757 | { |
||
758 | offsetT value = get_absolute_expression (); |
||
759 | |||
760 | if (value != 0 && value != 1) |
||
761 | { |
||
762 | as_bad (_("expected 0 or 1")); |
||
763 | ignore_rest_of_line (); |
||
764 | } |
||
765 | else |
||
766 | { |
||
767 | dwarf2_loc_mark_labels = value != 0; |
||
768 | demand_empty_rest_of_line (); |
||
769 | } |
||
770 | } |
||
771 | |||
772 | static struct frag * |
||
773 | first_frag_for_seg (segT seg) |
||
774 | { |
||
775 | return seg_info (seg)->frchainP->frch_root; |
||
776 | } |
||
777 | |||
778 | static struct frag * |
||
779 | last_frag_for_seg (segT seg) |
||
780 | { |
||
781 | frchainS *f = seg_info (seg)->frchainP; |
||
782 | |||
783 | while (f->frch_next != NULL) |
||
784 | f = f->frch_next; |
||
785 | |||
786 | return f->frch_last; |
||
787 | } |
||
788 | |||
789 | /* Emit a single byte into the current segment. */ |
||
790 | |||
791 | static inline void |
||
792 | out_byte (int byte) |
||
793 | { |
||
794 | FRAG_APPEND_1_CHAR (byte); |
||
795 | } |
||
796 | |||
797 | /* Emit a statement program opcode into the current segment. */ |
||
798 | |||
799 | static inline void |
||
800 | out_opcode (int opc) |
||
801 | { |
||
802 | out_byte (opc); |
||
803 | } |
||
804 | |||
805 | /* Emit a two-byte word into the current segment. */ |
||
806 | |||
807 | static inline void |
||
808 | out_two (int data) |
||
809 | { |
||
810 | md_number_to_chars (frag_more (2), data, 2); |
||
811 | } |
||
812 | |||
813 | /* Emit a four byte word into the current segment. */ |
||
814 | |||
815 | static inline void |
||
816 | out_four (int data) |
||
817 | { |
||
818 | md_number_to_chars (frag_more (4), data, 4); |
||
819 | } |
||
820 | |||
821 | /* Emit an unsigned "little-endian base 128" number. */ |
||
822 | |||
823 | static void |
||
824 | out_uleb128 (addressT value) |
||
825 | { |
||
826 | output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); |
||
827 | } |
||
828 | |||
829 | /* Emit a signed "little-endian base 128" number. */ |
||
830 | |||
831 | static void |
||
832 | out_leb128 (addressT value) |
||
833 | { |
||
834 | output_leb128 (frag_more (sizeof_leb128 (value, 1)), value, 1); |
||
835 | } |
||
836 | |||
837 | /* Emit a tuple for .debug_abbrev. */ |
||
838 | |||
839 | static inline void |
||
840 | out_abbrev (int name, int form) |
||
841 | { |
||
842 | out_uleb128 (name); |
||
843 | out_uleb128 (form); |
||
844 | } |
||
845 | |||
846 | /* Get the size of a fragment. */ |
||
847 | |||
848 | static offsetT |
||
849 | get_frag_fix (fragS *frag, segT seg) |
||
850 | { |
||
851 | frchainS *fr; |
||
852 | |||
853 | if (frag->fr_next) |
||
854 | return frag->fr_fix; |
||
855 | |||
856 | /* If a fragment is the last in the chain, special measures must be |
||
857 | taken to find its size before relaxation, since it may be pending |
||
858 | on some subsegment chain. */ |
||
859 | for (fr = seg_info (seg)->frchainP; fr; fr = fr->frch_next) |
||
860 | if (fr->frch_last == frag) |
||
861 | return (char *) obstack_next_free (&fr->frch_obstack) - frag->fr_literal; |
||
862 | |||
863 | abort (); |
||
864 | } |
||
865 | |||
866 | /* Set an absolute address (may result in a relocation entry). */ |
||
867 | |||
868 | static void |
||
869 | out_set_addr (symbolS *sym) |
||
870 | { |
||
871 | expressionS exp; |
||
872 | |||
873 | out_opcode (DW_LNS_extended_op); |
||
874 | out_uleb128 (sizeof_address + 1); |
||
875 | |||
876 | out_opcode (DW_LNE_set_address); |
||
877 | exp.X_op = O_symbol; |
||
878 | exp.X_add_symbol = sym; |
||
879 | exp.X_add_number = 0; |
||
880 | emit_expr (&exp, sizeof_address); |
||
881 | } |
||
882 | |||
883 | static void scale_addr_delta (addressT *); |
||
884 | |||
885 | static void |
||
886 | scale_addr_delta (addressT *addr_delta) |
||
887 | { |
||
888 | static int printed_this = 0; |
||
889 | if (DWARF2_LINE_MIN_INSN_LENGTH > 1) |
||
890 | { |
||
891 | if (*addr_delta % DWARF2_LINE_MIN_INSN_LENGTH != 0 && !printed_this) |
||
892 | { |
||
893 | as_bad("unaligned opcodes detected in executable segment"); |
||
894 | printed_this = 1; |
||
895 | } |
||
896 | *addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH; |
||
897 | } |
||
898 | } |
||
899 | |||
900 | /* Encode a pair of line and address skips as efficiently as possible. |
||
901 | Note that the line skip is signed, whereas the address skip is unsigned. |
||
902 | |||
903 | The following two routines *must* be kept in sync. This is |
||
904 | enforced by making emit_inc_line_addr abort if we do not emit |
||
905 | exactly the expected number of bytes. */ |
||
906 | |||
907 | static int |
||
908 | size_inc_line_addr (int line_delta, addressT addr_delta) |
||
909 | { |
||
910 | unsigned int tmp, opcode; |
||
911 | int len = 0; |
||
912 | |||
913 | /* Scale the address delta by the minimum instruction length. */ |
||
914 | scale_addr_delta (&addr_delta); |
||
915 | |||
916 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. |
||
917 | We cannot use special opcodes here, since we want the end_sequence |
||
918 | to emit the matrix entry. */ |
||
919 | if (line_delta == INT_MAX) |
||
920 | { |
||
921 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
||
922 | len = 1; |
||
923 | else |
||
924 | len = 1 + sizeof_leb128 (addr_delta, 0); |
||
925 | return len + 3; |
||
926 | } |
||
927 | |||
928 | /* Bias the line delta by the base. */ |
||
929 | tmp = line_delta - DWARF2_LINE_BASE; |
||
930 | |||
931 | /* If the line increment is out of range of a special opcode, we |
||
932 | must encode it with DW_LNS_advance_line. */ |
||
933 | if (tmp >= DWARF2_LINE_RANGE) |
||
934 | { |
||
935 | len = 1 + sizeof_leb128 (line_delta, 1); |
||
936 | line_delta = 0; |
||
937 | tmp = 0 - DWARF2_LINE_BASE; |
||
938 | } |
||
939 | |||
940 | /* Bias the opcode by the special opcode base. */ |
||
941 | tmp += DWARF2_LINE_OPCODE_BASE; |
||
942 | |||
943 | /* Avoid overflow when addr_delta is large. */ |
||
944 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) |
||
945 | { |
||
946 | /* Try using a special opcode. */ |
||
947 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; |
||
948 | if (opcode <= 255) |
||
949 | return len + 1; |
||
950 | |||
951 | /* Try using DW_LNS_const_add_pc followed by special op. */ |
||
952 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; |
||
953 | if (opcode <= 255) |
||
954 | return len + 2; |
||
955 | } |
||
956 | |||
957 | /* Otherwise use DW_LNS_advance_pc. */ |
||
958 | len += 1 + sizeof_leb128 (addr_delta, 0); |
||
959 | |||
960 | /* DW_LNS_copy or special opcode. */ |
||
961 | len += 1; |
||
962 | |||
963 | return len; |
||
964 | } |
||
965 | |||
966 | static void |
||
967 | emit_inc_line_addr (int line_delta, addressT addr_delta, char *p, int len) |
||
968 | { |
||
969 | unsigned int tmp, opcode; |
||
970 | int need_copy = 0; |
||
971 | char *end = p + len; |
||
972 | |||
973 | /* Line number sequences cannot go backward in addresses. This means |
||
974 | we've incorrectly ordered the statements in the sequence. */ |
||
975 | gas_assert ((offsetT) addr_delta >= 0); |
||
976 | |||
977 | /* Scale the address delta by the minimum instruction length. */ |
||
978 | scale_addr_delta (&addr_delta); |
||
979 | |||
980 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. |
||
981 | We cannot use special opcodes here, since we want the end_sequence |
||
982 | to emit the matrix entry. */ |
||
983 | if (line_delta == INT_MAX) |
||
984 | { |
||
985 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
||
986 | *p++ = DW_LNS_const_add_pc; |
||
987 | else |
||
988 | { |
||
989 | *p++ = DW_LNS_advance_pc; |
||
990 | p += output_leb128 (p, addr_delta, 0); |
||
991 | } |
||
992 | |||
993 | *p++ = DW_LNS_extended_op; |
||
994 | *p++ = 1; |
||
995 | *p++ = DW_LNE_end_sequence; |
||
996 | goto done; |
||
997 | } |
||
998 | |||
999 | /* Bias the line delta by the base. */ |
||
1000 | tmp = line_delta - DWARF2_LINE_BASE; |
||
1001 | |||
1002 | /* If the line increment is out of range of a special opcode, we |
||
1003 | must encode it with DW_LNS_advance_line. */ |
||
1004 | if (tmp >= DWARF2_LINE_RANGE) |
||
1005 | { |
||
1006 | *p++ = DW_LNS_advance_line; |
||
1007 | p += output_leb128 (p, line_delta, 1); |
||
1008 | |||
1009 | line_delta = 0; |
||
1010 | tmp = 0 - DWARF2_LINE_BASE; |
||
1011 | need_copy = 1; |
||
1012 | } |
||
1013 | |||
1014 | /* Prettier, I think, to use DW_LNS_copy instead of a "line +0, addr +0" |
||
1015 | special opcode. */ |
||
1016 | if (line_delta == 0 && addr_delta == 0) |
||
1017 | { |
||
1018 | *p++ = DW_LNS_copy; |
||
1019 | goto done; |
||
1020 | } |
||
1021 | |||
1022 | /* Bias the opcode by the special opcode base. */ |
||
1023 | tmp += DWARF2_LINE_OPCODE_BASE; |
||
1024 | |||
1025 | /* Avoid overflow when addr_delta is large. */ |
||
1026 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) |
||
1027 | { |
||
1028 | /* Try using a special opcode. */ |
||
1029 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; |
||
1030 | if (opcode <= 255) |
||
1031 | { |
||
1032 | *p++ = opcode; |
||
1033 | goto done; |
||
1034 | } |
||
1035 | |||
1036 | /* Try using DW_LNS_const_add_pc followed by special op. */ |
||
1037 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; |
||
1038 | if (opcode <= 255) |
||
1039 | { |
||
1040 | *p++ = DW_LNS_const_add_pc; |
||
1041 | *p++ = opcode; |
||
1042 | goto done; |
||
1043 | } |
||
1044 | } |
||
1045 | |||
1046 | /* Otherwise use DW_LNS_advance_pc. */ |
||
1047 | *p++ = DW_LNS_advance_pc; |
||
1048 | p += output_leb128 (p, addr_delta, 0); |
||
1049 | |||
1050 | if (need_copy) |
||
1051 | *p++ = DW_LNS_copy; |
||
1052 | else |
||
1053 | *p++ = tmp; |
||
1054 | |||
1055 | done: |
||
1056 | gas_assert (p == end); |
||
1057 | } |
||
1058 | |||
1059 | /* Handy routine to combine calls to the above two routines. */ |
||
1060 | |||
1061 | static void |
||
1062 | out_inc_line_addr (int line_delta, addressT addr_delta) |
||
1063 | { |
||
1064 | int len = size_inc_line_addr (line_delta, addr_delta); |
||
1065 | emit_inc_line_addr (line_delta, addr_delta, frag_more (len), len); |
||
1066 | } |
||
1067 | |||
1068 | /* Write out an alternative form of line and address skips using |
||
1069 | DW_LNS_fixed_advance_pc opcodes. This uses more space than the default |
||
1070 | line and address information, but it is required if linker relaxation |
||
1071 | could change the code offsets. The following two routines *must* be |
||
1072 | kept in sync. */ |
||
1073 | #define ADDR_DELTA_LIMIT 50000 |
||
1074 | |||
1075 | static int |
||
1076 | size_fixed_inc_line_addr (int line_delta, addressT addr_delta) |
||
1077 | { |
||
1078 | int len = 0; |
||
1079 | |||
1080 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. */ |
||
1081 | if (line_delta != INT_MAX) |
||
1082 | len = 1 + sizeof_leb128 (line_delta, 1); |
||
1083 | |||
1084 | if (addr_delta > ADDR_DELTA_LIMIT) |
||
1085 | { |
||
1086 | /* DW_LNS_extended_op */ |
||
1087 | len += 1 + sizeof_leb128 (sizeof_address + 1, 0); |
||
1088 | /* DW_LNE_set_address */ |
||
1089 | len += 1 + sizeof_address; |
||
1090 | } |
||
1091 | else |
||
1092 | /* DW_LNS_fixed_advance_pc */ |
||
1093 | len += 3; |
||
1094 | |||
1095 | if (line_delta == INT_MAX) |
||
1096 | /* DW_LNS_extended_op + DW_LNE_end_sequence */ |
||
1097 | len += 3; |
||
1098 | else |
||
1099 | /* DW_LNS_copy */ |
||
1100 | len += 1; |
||
1101 | |||
1102 | return len; |
||
1103 | } |
||
1104 | |||
1105 | static void |
||
1106 | emit_fixed_inc_line_addr (int line_delta, addressT addr_delta, fragS *frag, |
||
1107 | char *p, int len) |
||
1108 | { |
||
1109 | expressionS *pexp; |
||
1110 | char *end = p + len; |
||
1111 | |||
1112 | /* Line number sequences cannot go backward in addresses. This means |
||
1113 | we've incorrectly ordered the statements in the sequence. */ |
||
1114 | gas_assert ((offsetT) addr_delta >= 0); |
||
1115 | |||
1116 | /* Verify that we have kept in sync with size_fixed_inc_line_addr. */ |
||
1117 | gas_assert (len == size_fixed_inc_line_addr (line_delta, addr_delta)); |
||
1118 | |||
1119 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. */ |
||
1120 | if (line_delta != INT_MAX) |
||
1121 | { |
||
1122 | *p++ = DW_LNS_advance_line; |
||
1123 | p += output_leb128 (p, line_delta, 1); |
||
1124 | } |
||
1125 | |||
1126 | pexp = symbol_get_value_expression (frag->fr_symbol); |
||
1127 | |||
1128 | /* The DW_LNS_fixed_advance_pc opcode has a 2-byte operand so it can |
||
1129 | advance the address by at most 64K. Linker relaxation (without |
||
1130 | which this function would not be used) could change the operand by |
||
1131 | an unknown amount. If the address increment is getting close to |
||
1132 | the limit, just reset the address. */ |
||
1133 | if (addr_delta > ADDR_DELTA_LIMIT) |
||
1134 | { |
||
1135 | symbolS *to_sym; |
||
1136 | expressionS exp; |
||
1137 | |||
1138 | gas_assert (pexp->X_op == O_subtract); |
||
1139 | to_sym = pexp->X_add_symbol; |
||
1140 | |||
1141 | *p++ = DW_LNS_extended_op; |
||
1142 | p += output_leb128 (p, sizeof_address + 1, 0); |
||
1143 | *p++ = DW_LNE_set_address; |
||
1144 | exp.X_op = O_symbol; |
||
1145 | exp.X_add_symbol = to_sym; |
||
1146 | exp.X_add_number = 0; |
||
1147 | emit_expr_fix (&exp, sizeof_address, frag, p); |
||
1148 | p += sizeof_address; |
||
1149 | } |
||
1150 | else |
||
1151 | { |
||
1152 | *p++ = DW_LNS_fixed_advance_pc; |
||
1153 | emit_expr_fix (pexp, 2, frag, p); |
||
1154 | p += 2; |
||
1155 | } |
||
1156 | |||
1157 | if (line_delta == INT_MAX) |
||
1158 | { |
||
1159 | *p++ = DW_LNS_extended_op; |
||
1160 | *p++ = 1; |
||
1161 | *p++ = DW_LNE_end_sequence; |
||
1162 | } |
||
1163 | else |
||
1164 | *p++ = DW_LNS_copy; |
||
1165 | |||
1166 | gas_assert (p == end); |
||
1167 | } |
||
1168 | |||
1169 | /* Generate a variant frag that we can use to relax address/line |
||
1170 | increments between fragments of the target segment. */ |
||
1171 | |||
1172 | static void |
||
1173 | relax_inc_line_addr (int line_delta, symbolS *to_sym, symbolS *from_sym) |
||
1174 | { |
||
1175 | expressionS exp; |
||
1176 | int max_chars; |
||
1177 | |||
1178 | exp.X_op = O_subtract; |
||
1179 | exp.X_add_symbol = to_sym; |
||
1180 | exp.X_op_symbol = from_sym; |
||
1181 | exp.X_add_number = 0; |
||
1182 | |||
1183 | /* The maximum size of the frag is the line delta with a maximum |
||
1184 | sized address delta. */ |
||
1185 | if (DWARF2_USE_FIXED_ADVANCE_PC) |
||
1186 | max_chars = size_fixed_inc_line_addr (line_delta, |
||
1187 | -DWARF2_LINE_MIN_INSN_LENGTH); |
||
1188 | else |
||
1189 | max_chars = size_inc_line_addr (line_delta, -DWARF2_LINE_MIN_INSN_LENGTH); |
||
1190 | |||
1191 | frag_var (rs_dwarf2dbg, max_chars, max_chars, 1, |
||
1192 | make_expr_symbol (&exp), line_delta, NULL); |
||
1193 | } |
||
1194 | |||
1195 | /* The function estimates the size of a rs_dwarf2dbg variant frag |
||
1196 | based on the current values of the symbols. It is called before |
||
1197 | the relaxation loop. We set fr_subtype to the expected length. */ |
||
1198 | |||
1199 | int |
||
1200 | dwarf2dbg_estimate_size_before_relax (fragS *frag) |
||
1201 | { |
||
1202 | offsetT addr_delta; |
||
1203 | int size; |
||
1204 | |||
1205 | addr_delta = resolve_symbol_value (frag->fr_symbol); |
||
1206 | if (DWARF2_USE_FIXED_ADVANCE_PC) |
||
1207 | size = size_fixed_inc_line_addr (frag->fr_offset, addr_delta); |
||
1208 | else |
||
1209 | size = size_inc_line_addr (frag->fr_offset, addr_delta); |
||
1210 | |||
1211 | frag->fr_subtype = size; |
||
1212 | |||
1213 | return size; |
||
1214 | } |
||
1215 | |||
1216 | /* This function relaxes a rs_dwarf2dbg variant frag based on the |
||
1217 | current values of the symbols. fr_subtype is the current length |
||
1218 | of the frag. This returns the change in frag length. */ |
||
1219 | |||
1220 | int |
||
1221 | dwarf2dbg_relax_frag (fragS *frag) |
||
1222 | { |
||
1223 | int old_size, new_size; |
||
1224 | |||
1225 | old_size = frag->fr_subtype; |
||
1226 | new_size = dwarf2dbg_estimate_size_before_relax (frag); |
||
1227 | |||
1228 | return new_size - old_size; |
||
1229 | } |
||
1230 | |||
1231 | /* This function converts a rs_dwarf2dbg variant frag into a normal |
||
1232 | fill frag. This is called after all relaxation has been done. |
||
1233 | fr_subtype will be the desired length of the frag. */ |
||
1234 | |||
1235 | void |
||
1236 | dwarf2dbg_convert_frag (fragS *frag) |
||
1237 | { |
||
1238 | offsetT addr_diff; |
||
1239 | |||
1240 | if (DWARF2_USE_FIXED_ADVANCE_PC) |
||
1241 | { |
||
1242 | /* If linker relaxation is enabled then the distance bewteen the two |
||
1243 | symbols in the frag->fr_symbol expression might change. Hence we |
||
1244 | cannot rely upon the value computed by resolve_symbol_value. |
||
1245 | Instead we leave the expression unfinalized and allow |
||
1246 | emit_fixed_inc_line_addr to create a fixup (which later becomes a |
||
1247 | relocation) that will allow the linker to correctly compute the |
||
1248 | actual address difference. We have to use a fixed line advance for |
||
1249 | this as we cannot (easily) relocate leb128 encoded values. */ |
||
1250 | int saved_finalize_syms = finalize_syms; |
||
1251 | |||
1252 | finalize_syms = 0; |
||
1253 | addr_diff = resolve_symbol_value (frag->fr_symbol); |
||
1254 | finalize_syms = saved_finalize_syms; |
||
1255 | } |
||
1256 | else |
||
1257 | addr_diff = resolve_symbol_value (frag->fr_symbol); |
||
1258 | |||
1259 | /* fr_var carries the max_chars that we created the fragment with. |
||
1260 | fr_subtype carries the current expected length. We must, of |
||
1261 | course, have allocated enough memory earlier. */ |
||
1262 | gas_assert (frag->fr_var >= (int) frag->fr_subtype); |
||
1263 | |||
1264 | if (DWARF2_USE_FIXED_ADVANCE_PC) |
||
1265 | emit_fixed_inc_line_addr (frag->fr_offset, addr_diff, frag, |
||
1266 | frag->fr_literal + frag->fr_fix, |
||
1267 | frag->fr_subtype); |
||
1268 | else |
||
1269 | emit_inc_line_addr (frag->fr_offset, addr_diff, |
||
1270 | frag->fr_literal + frag->fr_fix, frag->fr_subtype); |
||
1271 | |||
1272 | frag->fr_fix += frag->fr_subtype; |
||
1273 | frag->fr_type = rs_fill; |
||
1274 | frag->fr_var = 0; |
||
1275 | frag->fr_offset = 0; |
||
1276 | } |
||
1277 | |||
1278 | /* Generate .debug_line content for the chain of line number entries |
||
1279 | beginning at E, for segment SEG. */ |
||
1280 | |||
1281 | static void |
||
1282 | process_entries (segT seg, struct line_entry *e) |
||
1283 | { |
||
1284 | unsigned filenum = 1; |
||
1285 | unsigned line = 1; |
||
1286 | unsigned column = 0; |
||
1287 | unsigned isa = 0; |
||
1288 | unsigned flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0; |
||
1289 | fragS *last_frag = NULL, *frag; |
||
1290 | addressT last_frag_ofs = 0, frag_ofs; |
||
1291 | symbolS *last_lab = NULL, *lab; |
||
1292 | struct line_entry *next; |
||
1293 | |||
1294 | if (flag_dwarf_sections) |
||
1295 | { |
||
1296 | char * name; |
||
1297 | const char * sec_name; |
||
1298 | |||
1299 | /* Switch to the relevent sub-section before we start to emit |
||
1300 | the line number table. |
||
1301 | |||
1302 | FIXME: These sub-sections do not have a normal Line Number |
||
1303 | Program Header, thus strictly speaking they are not valid |
||
1304 | DWARF sections. Unfortunately the DWARF standard assumes |
||
1305 | a one-to-one relationship between compilation units and |
||
1306 | line number tables. Thus we have to have a .debug_line |
||
1307 | section, as well as our sub-sections, and we have to ensure |
||
1308 | that all of the sub-sections are merged into a proper |
||
1309 | .debug_line section before a debugger sees them. */ |
||
1310 | |||
1311 | sec_name = bfd_get_section_name (stdoutput, seg); |
||
1312 | if (strcmp (sec_name, ".text") != 0) |
||
1313 | { |
||
1314 | unsigned int len; |
||
1315 | |||
1316 | len = strlen (sec_name); |
||
1317 | name = xmalloc (len + 11 + 2); |
||
1318 | sprintf (name, ".debug_line%s", sec_name); |
||
1319 | subseg_set (subseg_get (name, FALSE), 0); |
||
1320 | } |
||
1321 | else |
||
1322 | /* Don't create a .debug_line.text section - |
||
1323 | that is redundant. Instead just switch back to the |
||
1324 | normal .debug_line section. */ |
||
1325 | subseg_set (subseg_get (".debug_line", FALSE), 0); |
||
1326 | } |
||
1327 | |||
1328 | do |
||
1329 | { |
||
1330 | int line_delta; |
||
1331 | |||
1332 | if (filenum != e->loc.filenum) |
||
1333 | { |
||
1334 | filenum = e->loc.filenum; |
||
1335 | out_opcode (DW_LNS_set_file); |
||
1336 | out_uleb128 (filenum); |
||
1337 | } |
||
1338 | |||
1339 | if (column != e->loc.column) |
||
1340 | { |
||
1341 | column = e->loc.column; |
||
1342 | out_opcode (DW_LNS_set_column); |
||
1343 | out_uleb128 (column); |
||
1344 | } |
||
1345 | |||
1346 | if (e->loc.discriminator != 0) |
||
1347 | { |
||
1348 | out_opcode (DW_LNS_extended_op); |
||
1349 | out_leb128 (1 + sizeof_leb128 (e->loc.discriminator, 0)); |
||
1350 | out_opcode (DW_LNE_set_discriminator); |
||
1351 | out_uleb128 (e->loc.discriminator); |
||
1352 | } |
||
1353 | |||
1354 | if (isa != e->loc.isa) |
||
1355 | { |
||
1356 | isa = e->loc.isa; |
||
1357 | out_opcode (DW_LNS_set_isa); |
||
1358 | out_uleb128 (isa); |
||
1359 | } |
||
1360 | |||
1361 | if ((e->loc.flags ^ flags) & DWARF2_FLAG_IS_STMT) |
||
1362 | { |
||
1363 | flags = e->loc.flags; |
||
1364 | out_opcode (DW_LNS_negate_stmt); |
||
1365 | } |
||
1366 | |||
1367 | if (e->loc.flags & DWARF2_FLAG_BASIC_BLOCK) |
||
1368 | out_opcode (DW_LNS_set_basic_block); |
||
1369 | |||
1370 | if (e->loc.flags & DWARF2_FLAG_PROLOGUE_END) |
||
1371 | out_opcode (DW_LNS_set_prologue_end); |
||
1372 | |||
1373 | if (e->loc.flags & DWARF2_FLAG_EPILOGUE_BEGIN) |
||
1374 | out_opcode (DW_LNS_set_epilogue_begin); |
||
1375 | |||
1376 | /* Don't try to optimize away redundant entries; gdb wants two |
||
1377 | entries for a function where the code starts on the same line as |
||
1378 | the {, and there's no way to identify that case here. Trust gcc |
||
1379 | to optimize appropriately. */ |
||
1380 | line_delta = e->loc.line - line; |
||
1381 | lab = e->label; |
||
1382 | frag = symbol_get_frag (lab); |
||
1383 | frag_ofs = S_GET_VALUE (lab); |
||
1384 | |||
1385 | if (last_frag == NULL) |
||
1386 | { |
||
1387 | out_set_addr (lab); |
||
1388 | out_inc_line_addr (line_delta, 0); |
||
1389 | } |
||
1390 | else if (frag == last_frag && ! DWARF2_USE_FIXED_ADVANCE_PC) |
||
1391 | out_inc_line_addr (line_delta, frag_ofs - last_frag_ofs); |
||
1392 | else |
||
1393 | relax_inc_line_addr (line_delta, lab, last_lab); |
||
1394 | |||
1395 | line = e->loc.line; |
||
1396 | last_lab = lab; |
||
1397 | last_frag = frag; |
||
1398 | last_frag_ofs = frag_ofs; |
||
1399 | |||
1400 | next = e->next; |
||
1401 | free (e); |
||
1402 | e = next; |
||
1403 | } |
||
1404 | while (e); |
||
1405 | |||
1406 | /* Emit a DW_LNE_end_sequence for the end of the section. */ |
||
1407 | frag = last_frag_for_seg (seg); |
||
1408 | frag_ofs = get_frag_fix (frag, seg); |
||
1409 | if (frag == last_frag && ! DWARF2_USE_FIXED_ADVANCE_PC) |
||
1410 | out_inc_line_addr (INT_MAX, frag_ofs - last_frag_ofs); |
||
1411 | else |
||
1412 | { |
||
1413 | lab = symbol_temp_new (seg, frag_ofs, frag); |
||
1414 | relax_inc_line_addr (INT_MAX, lab, last_lab); |
||
1415 | } |
||
1416 | } |
||
1417 | |||
1418 | /* Emit the directory and file tables for .debug_line. */ |
||
1419 | |||
1420 | static void |
||
1421 | out_file_list (void) |
||
1422 | { |
||
1423 | size_t size; |
||
1424 | const char *dir; |
||
1425 | char *cp; |
||
1426 | unsigned int i; |
||
1427 | |||
1428 | /* Emit directory list. */ |
||
1429 | for (i = 1; i < dirs_in_use; ++i) |
||
1430 | { |
||
1431 | dir = remap_debug_filename (dirs[i]); |
||
1432 | size = strlen (dir) + 1; |
||
1433 | cp = frag_more (size); |
||
1434 | memcpy (cp, dir, size); |
||
1435 | } |
||
1436 | /* Terminate it. */ |
||
1437 | out_byte ('\0'); |
||
1438 | |||
1439 | for (i = 1; i < files_in_use; ++i) |
||
1440 | { |
||
1441 | const char *fullfilename; |
||
1442 | |||
1443 | if (files[i].filename == NULL) |
||
1444 | { |
||
1445 | as_bad (_("unassigned file number %ld"), (long) i); |
||
1446 | /* Prevent a crash later, particularly for file 1. */ |
||
1447 | files[i].filename = ""; |
||
1448 | continue; |
||
1449 | } |
||
1450 | |||
1451 | fullfilename = DWARF2_FILE_NAME (files[i].filename, |
||
1452 | files[i].dir ? dirs [files [i].dir] : ""); |
||
1453 | size = strlen (fullfilename) + 1; |
||
1454 | cp = frag_more (size); |
||
1455 | memcpy (cp, fullfilename, size); |
||
1456 | |||
1457 | out_uleb128 (files[i].dir); /* directory number */ |
||
1458 | /* Output the last modification timestamp. */ |
||
1459 | out_uleb128 (DWARF2_FILE_TIME_NAME (files[i].filename, |
||
1460 | files[i].dir ? dirs [files [i].dir] : "")); |
||
1461 | /* Output the filesize. */ |
||
1462 | out_uleb128 (DWARF2_FILE_SIZE_NAME (files[i].filename, |
||
1463 | files[i].dir ? dirs [files [i].dir] : "")); |
||
1464 | } |
||
1465 | |||
1466 | /* Terminate filename list. */ |
||
1467 | out_byte (0); |
||
1468 | } |
||
1469 | |||
1470 | /* Switch to SEC and output a header length field. Return the size of |
||
1471 | offsets used in SEC. The caller must set EXPR->X_add_symbol value |
||
1472 | to the end of the section. */ |
||
1473 | |||
1474 | static int |
||
1475 | out_header (asection *sec, expressionS *exp) |
||
1476 | { |
||
1477 | symbolS *start_sym; |
||
1478 | symbolS *end_sym; |
||
1479 | |||
1480 | subseg_set (sec, 0); |
||
1481 | start_sym = symbol_temp_new_now (); |
||
1482 | end_sym = symbol_temp_make (); |
||
1483 | |||
1484 | /* Total length of the information. */ |
||
1485 | exp->X_op = O_subtract; |
||
1486 | exp->X_add_symbol = end_sym; |
||
1487 | exp->X_op_symbol = start_sym; |
||
1488 | |||
1489 | switch (DWARF2_FORMAT (sec)) |
||
1490 | { |
||
1491 | case dwarf2_format_32bit: |
||
1492 | exp->X_add_number = -4; |
||
1493 | emit_expr (exp, 4); |
||
1494 | return 4; |
||
1495 | |||
1496 | case dwarf2_format_64bit: |
||
1497 | exp->X_add_number = -12; |
||
1498 | out_four (-1); |
||
1499 | emit_expr (exp, 8); |
||
1500 | return 8; |
||
1501 | |||
1502 | case dwarf2_format_64bit_irix: |
||
1503 | exp->X_add_number = -8; |
||
1504 | emit_expr (exp, 8); |
||
1505 | return 8; |
||
1506 | } |
||
1507 | |||
1508 | as_fatal (_("internal error: unknown dwarf2 format")); |
||
1509 | return 0; |
||
1510 | } |
||
1511 | |||
1512 | /* Emit the collected .debug_line data. */ |
||
1513 | |||
1514 | static void |
||
1515 | out_debug_line (segT line_seg) |
||
1516 | { |
||
1517 | expressionS exp; |
||
1518 | symbolS *prologue_end; |
||
1519 | symbolS *line_end; |
||
1520 | struct line_seg *s; |
||
1521 | int sizeof_offset; |
||
1522 | |||
1523 | sizeof_offset = out_header (line_seg, &exp); |
||
1524 | line_end = exp.X_add_symbol; |
||
1525 | |||
1526 | /* Version. */ |
||
1527 | out_two (DWARF2_LINE_VERSION); |
||
1528 | |||
1529 | /* Length of the prologue following this length. */ |
||
1530 | prologue_end = symbol_temp_make (); |
||
1531 | exp.X_add_symbol = prologue_end; |
||
1532 | exp.X_add_number = - (4 + 2 + 4); |
||
1533 | emit_expr (&exp, sizeof_offset); |
||
1534 | |||
1535 | /* Parameters of the state machine. */ |
||
1536 | out_byte (DWARF2_LINE_MIN_INSN_LENGTH); |
||
1537 | out_byte (DWARF2_LINE_DEFAULT_IS_STMT); |
||
1538 | out_byte (DWARF2_LINE_BASE); |
||
1539 | out_byte (DWARF2_LINE_RANGE); |
||
1540 | out_byte (DWARF2_LINE_OPCODE_BASE); |
||
1541 | |||
1542 | /* Standard opcode lengths. */ |
||
1543 | out_byte (0); /* DW_LNS_copy */ |
||
1544 | out_byte (1); /* DW_LNS_advance_pc */ |
||
1545 | out_byte (1); /* DW_LNS_advance_line */ |
||
1546 | out_byte (1); /* DW_LNS_set_file */ |
||
1547 | out_byte (1); /* DW_LNS_set_column */ |
||
1548 | out_byte (0); /* DW_LNS_negate_stmt */ |
||
1549 | out_byte (0); /* DW_LNS_set_basic_block */ |
||
1550 | out_byte (0); /* DW_LNS_const_add_pc */ |
||
1551 | out_byte (1); /* DW_LNS_fixed_advance_pc */ |
||
1552 | out_byte (0); /* DW_LNS_set_prologue_end */ |
||
1553 | out_byte (0); /* DW_LNS_set_epilogue_begin */ |
||
1554 | out_byte (1); /* DW_LNS_set_isa */ |
||
1555 | |||
1556 | out_file_list (); |
||
1557 | |||
1558 | symbol_set_value_now (prologue_end); |
||
1559 | |||
1560 | /* For each section, emit a statement program. */ |
||
1561 | for (s = all_segs; s; s = s->next) |
||
1562 | if (SEG_NORMAL (s->seg)) |
||
1563 | process_entries (s->seg, s->head->head); |
||
1564 | else |
||
1565 | as_warn ("dwarf line number information for %s ignored", |
||
1566 | segment_name (s->seg)); |
||
1567 | |||
1568 | if (flag_dwarf_sections) |
||
1569 | /* We have to switch to the special .debug_line_end section |
||
1570 | before emitting the end-of-debug_line symbol. The linker |
||
1571 | script arranges for this section to be placed after all the |
||
1572 | (potentially garbage collected) .debug_line. |
||
1573 | This section contains the line_end symbol which is used to |
||
1574 | compute the size of the linked .debug_line section, as seen |
||
1575 | in the DWARF Line Number header. */ |
||
1576 | subseg_set (subseg_get (".debug_line_end", FALSE), 0); |
||
1577 | |||
1578 | symbol_set_value_now (line_end); |
||
1579 | } |
||
1580 | |||
1581 | static void |
||
1582 | out_debug_ranges (segT ranges_seg) |
||
1583 | { |
||
1584 | unsigned int addr_size = sizeof_address; |
||
1585 | struct line_seg *s; |
||
1586 | expressionS exp; |
||
1587 | unsigned int i; |
||
1588 | |||
1589 | subseg_set (ranges_seg, 0); |
||
1590 | |||
1591 | /* Base Address Entry. */ |
||
1592 | for (i = 0; i < addr_size; i++) |
||
1593 | out_byte (0xff); |
||
1594 | for (i = 0; i < addr_size; i++) |
||
1595 | out_byte (0); |
||
1596 | |||
1597 | /* Range List Entry. */ |
||
1598 | for (s = all_segs; s; s = s->next) |
||
1599 | { |
||
1600 | fragS *frag; |
||
1601 | symbolS *beg, *end; |
||
1602 | |||
1603 | frag = first_frag_for_seg (s->seg); |
||
1604 | beg = symbol_temp_new (s->seg, 0, frag); |
||
1605 | s->text_start = beg; |
||
1606 | |||
1607 | frag = last_frag_for_seg (s->seg); |
||
1608 | end = symbol_temp_new (s->seg, get_frag_fix (frag, s->seg), frag); |
||
1609 | s->text_end = end; |
||
1610 | |||
1611 | exp.X_op = O_symbol; |
||
1612 | exp.X_add_symbol = beg; |
||
1613 | exp.X_add_number = 0; |
||
1614 | emit_expr (&exp, addr_size); |
||
1615 | |||
1616 | exp.X_op = O_symbol; |
||
1617 | exp.X_add_symbol = end; |
||
1618 | exp.X_add_number = 0; |
||
1619 | emit_expr (&exp, addr_size); |
||
1620 | } |
||
1621 | |||
1622 | /* End of Range Entry. */ |
||
1623 | for (i = 0; i < addr_size; i++) |
||
1624 | out_byte (0); |
||
1625 | for (i = 0; i < addr_size; i++) |
||
1626 | out_byte (0); |
||
1627 | } |
||
1628 | |||
1629 | /* Emit data for .debug_aranges. */ |
||
1630 | |||
1631 | static void |
||
1632 | out_debug_aranges (segT aranges_seg, segT info_seg) |
||
1633 | { |
||
1634 | unsigned int addr_size = sizeof_address; |
||
1635 | struct line_seg *s; |
||
1636 | expressionS exp; |
||
1637 | symbolS *aranges_end; |
||
1638 | char *p; |
||
1639 | int sizeof_offset; |
||
1640 | |||
1641 | sizeof_offset = out_header (aranges_seg, &exp); |
||
1642 | aranges_end = exp.X_add_symbol; |
||
1643 | |||
1644 | /* Version. */ |
||
1645 | out_two (DWARF2_ARANGES_VERSION); |
||
1646 | |||
1647 | /* Offset to .debug_info. */ |
||
1648 | TC_DWARF2_EMIT_OFFSET (section_symbol (info_seg), sizeof_offset); |
||
1649 | |||
1650 | /* Size of an address (offset portion). */ |
||
1651 | out_byte (addr_size); |
||
1652 | |||
1653 | /* Size of a segment descriptor. */ |
||
1654 | out_byte (0); |
||
1655 | |||
1656 | /* Align the header. */ |
||
1657 | frag_align (ffs (2 * addr_size) - 1, 0, 0); |
||
1658 | |||
1659 | for (s = all_segs; s; s = s->next) |
||
1660 | { |
||
1661 | fragS *frag; |
||
1662 | symbolS *beg, *end; |
||
1663 | |||
1664 | frag = first_frag_for_seg (s->seg); |
||
1665 | beg = symbol_temp_new (s->seg, 0, frag); |
||
1666 | s->text_start = beg; |
||
1667 | |||
1668 | frag = last_frag_for_seg (s->seg); |
||
1669 | end = symbol_temp_new (s->seg, get_frag_fix (frag, s->seg), frag); |
||
1670 | s->text_end = end; |
||
1671 | |||
1672 | exp.X_op = O_symbol; |
||
1673 | exp.X_add_symbol = beg; |
||
1674 | exp.X_add_number = 0; |
||
1675 | emit_expr (&exp, addr_size); |
||
1676 | |||
1677 | exp.X_op = O_subtract; |
||
1678 | exp.X_add_symbol = end; |
||
1679 | exp.X_op_symbol = beg; |
||
1680 | exp.X_add_number = 0; |
||
1681 | emit_expr (&exp, addr_size); |
||
1682 | } |
||
1683 | |||
1684 | p = frag_more (2 * addr_size); |
||
1685 | md_number_to_chars (p, 0, addr_size); |
||
1686 | md_number_to_chars (p + addr_size, 0, addr_size); |
||
1687 | |||
1688 | symbol_set_value_now (aranges_end); |
||
1689 | } |
||
1690 | |||
1691 | /* Emit data for .debug_abbrev. Note that this must be kept in |
||
1692 | sync with out_debug_info below. */ |
||
1693 | |||
1694 | static void |
||
1695 | out_debug_abbrev (segT abbrev_seg, |
||
1696 | segT info_seg ATTRIBUTE_UNUSED, |
||
1697 | segT line_seg ATTRIBUTE_UNUSED) |
||
1698 | { |
||
1699 | subseg_set (abbrev_seg, 0); |
||
1700 | |||
1701 | out_uleb128 (1); |
||
1702 | out_uleb128 (DW_TAG_compile_unit); |
||
1703 | out_byte (DW_CHILDREN_no); |
||
1704 | if (DWARF2_FORMAT (line_seg) == dwarf2_format_32bit) |
||
1705 | out_abbrev (DW_AT_stmt_list, DW_FORM_data4); |
||
1706 | else |
||
1707 | out_abbrev (DW_AT_stmt_list, DW_FORM_data8); |
||
1708 | if (all_segs->next == NULL) |
||
1709 | { |
||
1710 | out_abbrev (DW_AT_low_pc, DW_FORM_addr); |
||
1711 | if (DWARF2_VERSION < 4) |
||
1712 | out_abbrev (DW_AT_high_pc, DW_FORM_addr); |
||
1713 | else |
||
1714 | out_abbrev (DW_AT_high_pc, (sizeof_address == 4 |
||
1715 | ? DW_FORM_data4 : DW_FORM_data8)); |
||
1716 | } |
||
1717 | else |
||
1718 | { |
||
1719 | if (DWARF2_FORMAT (info_seg) == dwarf2_format_32bit) |
||
1720 | out_abbrev (DW_AT_ranges, DW_FORM_data4); |
||
1721 | else |
||
1722 | out_abbrev (DW_AT_ranges, DW_FORM_data8); |
||
1723 | } |
||
1724 | out_abbrev (DW_AT_name, DW_FORM_string); |
||
1725 | out_abbrev (DW_AT_comp_dir, DW_FORM_string); |
||
1726 | out_abbrev (DW_AT_producer, DW_FORM_string); |
||
1727 | out_abbrev (DW_AT_language, DW_FORM_data2); |
||
1728 | out_abbrev (0, 0); |
||
1729 | |||
1730 | /* Terminate the abbreviations for this compilation unit. */ |
||
1731 | out_byte (0); |
||
1732 | } |
||
1733 | |||
1734 | /* Emit a description of this compilation unit for .debug_info. */ |
||
1735 | |||
1736 | static void |
||
1737 | out_debug_info (segT info_seg, segT abbrev_seg, segT line_seg, segT ranges_seg) |
||
1738 | { |
||
1739 | char producer[128]; |
||
1740 | const char *comp_dir; |
||
1741 | const char *dirname; |
||
1742 | expressionS exp; |
||
1743 | symbolS *info_end; |
||
1744 | char *p; |
||
1745 | int len; |
||
1746 | int sizeof_offset; |
||
1747 | |||
1748 | sizeof_offset = out_header (info_seg, &exp); |
||
1749 | info_end = exp.X_add_symbol; |
||
1750 | |||
1751 | /* DWARF version. */ |
||
1752 | out_two (DWARF2_VERSION); |
||
1753 | |||
1754 | /* .debug_abbrev offset */ |
||
1755 | TC_DWARF2_EMIT_OFFSET (section_symbol (abbrev_seg), sizeof_offset); |
||
1756 | |||
1757 | /* Target address size. */ |
||
1758 | out_byte (sizeof_address); |
||
1759 | |||
1760 | /* DW_TAG_compile_unit DIE abbrev */ |
||
1761 | out_uleb128 (1); |
||
1762 | |||
1763 | /* DW_AT_stmt_list */ |
||
1764 | TC_DWARF2_EMIT_OFFSET (section_symbol (line_seg), |
||
1765 | (DWARF2_FORMAT (line_seg) == dwarf2_format_32bit |
||
1766 | ? 4 : 8)); |
||
1767 | |||
1768 | /* These two attributes are emitted if all of the code is contiguous. */ |
||
1769 | if (all_segs->next == NULL) |
||
1770 | { |
||
1771 | /* DW_AT_low_pc */ |
||
1772 | exp.X_op = O_symbol; |
||
1773 | exp.X_add_symbol = all_segs->text_start; |
||
1774 | exp.X_add_number = 0; |
||
1775 | emit_expr (&exp, sizeof_address); |
||
1776 | |||
1777 | /* DW_AT_high_pc */ |
||
1778 | if (DWARF2_VERSION < 4) |
||
1779 | exp.X_op = O_symbol; |
||
1780 | else |
||
1781 | { |
||
1782 | exp.X_op = O_subtract; |
||
1783 | exp.X_op_symbol = all_segs->text_start; |
||
1784 | } |
||
1785 | exp.X_add_symbol = all_segs->text_end; |
||
1786 | exp.X_add_number = 0; |
||
1787 | emit_expr (&exp, sizeof_address); |
||
1788 | } |
||
1789 | else |
||
1790 | { |
||
1791 | /* This attribute is emitted if the code is disjoint. */ |
||
1792 | /* DW_AT_ranges. */ |
||
1793 | TC_DWARF2_EMIT_OFFSET (section_symbol (ranges_seg), sizeof_offset); |
||
1794 | } |
||
1795 | |||
1796 | /* DW_AT_name. We don't have the actual file name that was present |
||
1797 | on the command line, so assume files[1] is the main input file. |
||
1798 | We're not supposed to get called unless at least one line number |
||
1799 | entry was emitted, so this should always be defined. */ |
||
1800 | if (files_in_use == 0) |
||
1801 | abort (); |
||
1802 | if (files[1].dir) |
||
1803 | { |
||
1804 | dirname = remap_debug_filename (dirs[files[1].dir]); |
||
1805 | len = strlen (dirname); |
||
1806 | #ifdef TE_VMS |
||
1807 | /* Already has trailing slash. */ |
||
1808 | p = frag_more (len); |
||
1809 | memcpy (p, dirname, len); |
||
1810 | #else |
||
1811 | p = frag_more (len + 1); |
||
1812 | memcpy (p, dirname, len); |
||
1813 | INSERT_DIR_SEPARATOR (p, len); |
||
1814 | #endif |
||
1815 | } |
||
1816 | len = strlen (files[1].filename) + 1; |
||
1817 | p = frag_more (len); |
||
1818 | memcpy (p, files[1].filename, len); |
||
1819 | |||
1820 | /* DW_AT_comp_dir */ |
||
1821 | comp_dir = remap_debug_filename (getpwd ()); |
||
1822 | len = strlen (comp_dir) + 1; |
||
1823 | p = frag_more (len); |
||
1824 | memcpy (p, comp_dir, len); |
||
1825 | |||
1826 | /* DW_AT_producer */ |
||
1827 | sprintf (producer, "GNU AS %s", VERSION); |
||
1828 | len = strlen (producer) + 1; |
||
1829 | p = frag_more (len); |
||
1830 | memcpy (p, producer, len); |
||
1831 | |||
1832 | /* DW_AT_language. Yes, this is probably not really MIPS, but the |
||
1833 | dwarf2 draft has no standard code for assembler. */ |
||
1834 | out_two (DW_LANG_Mips_Assembler); |
||
1835 | |||
1836 | symbol_set_value_now (info_end); |
||
1837 | } |
||
1838 | |||
1839 | void |
||
1840 | dwarf2_init (void) |
||
1841 | { |
||
1842 | all_segs_hash = hash_new (); |
||
1843 | last_seg_ptr = &all_segs; |
||
1844 | } |
||
1845 | |||
1846 | |||
1847 | /* Finish the dwarf2 debug sections. We emit .debug.line if there |
||
1848 | were any .file/.loc directives, or --gdwarf2 was given, or if the |
||
1849 | file has a non-empty .debug_info section and an empty .debug_line |
||
1850 | section. If we emit .debug_line, and the .debug_info section is |
||
1851 | empty, we also emit .debug_info, .debug_aranges and .debug_abbrev. |
||
1852 | ALL_SEGS will be non-null if there were any .file/.loc directives, |
||
1853 | or --gdwarf2 was given and there were any located instructions |
||
1854 | emitted. */ |
||
1855 | |||
1856 | void |
||
1857 | dwarf2_finish (void) |
||
1858 | { |
||
1859 | segT line_seg; |
||
1860 | struct line_seg *s; |
||
1861 | segT info_seg; |
||
1862 | int emit_other_sections = 0; |
||
1863 | int empty_debug_line = 0; |
||
1864 | |||
1865 | info_seg = bfd_get_section_by_name (stdoutput, ".debug_info"); |
||
1866 | emit_other_sections = info_seg == NULL || !seg_not_empty_p (info_seg); |
||
1867 | |||
1868 | line_seg = bfd_get_section_by_name (stdoutput, ".debug_line"); |
||
1869 | empty_debug_line = line_seg == NULL || !seg_not_empty_p (line_seg); |
||
1870 | |||
1871 | /* We can't construct a new debug_line section if we already have one. |
||
1872 | Give an error. */ |
||
1873 | if (all_segs && !empty_debug_line) |
||
1874 | as_fatal ("duplicate .debug_line sections"); |
||
1875 | |||
1876 | if ((!all_segs && emit_other_sections) |
||
1877 | || (!emit_other_sections && !empty_debug_line)) |
||
1878 | /* If there is no line information and no non-empty .debug_info |
||
1879 | section, or if there is both a non-empty .debug_info and a non-empty |
||
1880 | .debug_line, then we do nothing. */ |
||
1881 | return; |
||
1882 | |||
1883 | /* Calculate the size of an address for the target machine. */ |
||
1884 | sizeof_address = DWARF2_ADDR_SIZE (stdoutput); |
||
1885 | |||
1886 | /* Create and switch to the line number section. */ |
||
1887 | line_seg = subseg_new (".debug_line", 0); |
||
1888 | bfd_set_section_flags (stdoutput, line_seg, SEC_READONLY | SEC_DEBUGGING); |
||
1889 | |||
1890 | /* For each subsection, chain the debug entries together. */ |
||
1891 | for (s = all_segs; s; s = s->next) |
||
1892 | { |
||
1893 | struct line_subseg *lss = s->head; |
||
1894 | struct line_entry **ptail = lss->ptail; |
||
1895 | |||
1896 | while ((lss = lss->next) != NULL) |
||
1897 | { |
||
1898 | *ptail = lss->head; |
||
1899 | ptail = lss->ptail; |
||
1900 | } |
||
1901 | } |
||
1902 | |||
1903 | out_debug_line (line_seg); |
||
1904 | |||
1905 | /* If this is assembler generated line info, and there is no |
||
1906 | debug_info already, we need .debug_info and .debug_abbrev |
||
1907 | sections as well. */ |
||
1908 | if (emit_other_sections) |
||
1909 | { |
||
1910 | segT abbrev_seg; |
||
1911 | segT aranges_seg; |
||
1912 | segT ranges_seg; |
||
1913 | |||
1914 | gas_assert (all_segs); |
||
1915 | |||
1916 | info_seg = subseg_new (".debug_info", 0); |
||
1917 | abbrev_seg = subseg_new (".debug_abbrev", 0); |
||
1918 | aranges_seg = subseg_new (".debug_aranges", 0); |
||
1919 | |||
1920 | bfd_set_section_flags (stdoutput, info_seg, |
||
1921 | SEC_READONLY | SEC_DEBUGGING); |
||
1922 | bfd_set_section_flags (stdoutput, abbrev_seg, |
||
1923 | SEC_READONLY | SEC_DEBUGGING); |
||
1924 | bfd_set_section_flags (stdoutput, aranges_seg, |
||
1925 | SEC_READONLY | SEC_DEBUGGING); |
||
1926 | |||
1927 | record_alignment (aranges_seg, ffs (2 * sizeof_address) - 1); |
||
1928 | |||
1929 | if (all_segs->next == NULL) |
||
1930 | ranges_seg = NULL; |
||
1931 | else |
||
1932 | { |
||
1933 | ranges_seg = subseg_new (".debug_ranges", 0); |
||
1934 | bfd_set_section_flags (stdoutput, ranges_seg, |
||
1935 | SEC_READONLY | SEC_DEBUGGING); |
||
1936 | record_alignment (ranges_seg, ffs (2 * sizeof_address) - 1); |
||
1937 | out_debug_ranges (ranges_seg); |
||
1938 | } |
||
1939 | |||
1940 | out_debug_aranges (aranges_seg, info_seg); |
||
1941 | out_debug_abbrev (abbrev_seg, info_seg, line_seg); |
||
1942 | out_debug_info (info_seg, abbrev_seg, line_seg, ranges_seg); |
||
1943 | } |
||
1944 | }>>>>>>>>=>=>>=>=>>>>>>>>=> |