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Rev | Author | Line No. | Line |
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5222 | serge | 1 | /* dwarf2dbg.c - DWARF2 debug support |
6324 | serge | 2 | Copyright (C) 1999-2015 Free Software Foundation, Inc. |
5222 | serge | 3 | Contributed by David Mosberger-Tang |
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 | |||
6324 | serge | 161 | #ifndef TC_PARSE_CONS_RETURN_NONE |
162 | #define TC_PARSE_CONS_RETURN_NONE BFD_RELOC_NONE |
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163 | #endif |
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164 | |||
5222 | serge | 165 | struct line_entry { |
166 | struct line_entry *next; |
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167 | symbolS *label; |
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168 | struct dwarf2_line_info loc; |
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169 | }; |
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170 | |||
171 | struct line_subseg { |
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172 | struct line_subseg *next; |
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173 | subsegT subseg; |
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174 | struct line_entry *head; |
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175 | struct line_entry **ptail; |
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176 | struct line_entry **pmove_tail; |
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177 | }; |
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178 | |||
179 | struct line_seg { |
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180 | struct line_seg *next; |
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181 | segT seg; |
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182 | struct line_subseg *head; |
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183 | symbolS *text_start; |
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184 | symbolS *text_end; |
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185 | }; |
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186 | |||
187 | /* Collects data for all line table entries during assembly. */ |
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188 | static struct line_seg *all_segs; |
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189 | static struct line_seg **last_seg_ptr; |
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190 | |||
191 | struct file_entry { |
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192 | const char *filename; |
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193 | unsigned int dir; |
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194 | }; |
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195 | |||
196 | /* Table of files used by .debug_line. */ |
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197 | static struct file_entry *files; |
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198 | static unsigned int files_in_use; |
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199 | static unsigned int files_allocated; |
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200 | |||
201 | /* Table of directories used by .debug_line. */ |
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202 | static char **dirs; |
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203 | static unsigned int dirs_in_use; |
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204 | static unsigned int dirs_allocated; |
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205 | |||
206 | /* TRUE when we've seen a .loc directive recently. Used to avoid |
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207 | doing work when there's nothing to do. */ |
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208 | bfd_boolean dwarf2_loc_directive_seen; |
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209 | |||
210 | /* TRUE when we're supposed to set the basic block mark whenever a |
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211 | label is seen. */ |
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212 | bfd_boolean dwarf2_loc_mark_labels; |
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213 | |||
214 | /* Current location as indicated by the most recent .loc directive. */ |
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215 | static struct dwarf2_line_info current = { |
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216 | 1, 1, 0, 0, |
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217 | DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0, |
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218 | |||
219 | }; |
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220 | |||
221 | /* The size of an address on the target. */ |
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222 | static unsigned int sizeof_address; |
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223 | |||
224 | static unsigned int get_filenum (const char *, unsigned int); |
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225 | |||
226 | #ifndef TC_DWARF2_EMIT_OFFSET |
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227 | #define TC_DWARF2_EMIT_OFFSET generic_dwarf2_emit_offset |
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228 | |||
229 | /* Create an offset to .dwarf2_*. */ |
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230 | |||
231 | static void |
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232 | generic_dwarf2_emit_offset (symbolS *symbol, unsigned int size) |
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233 | { |
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234 | expressionS exp; |
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235 | |||
236 | exp.X_op = O_symbol; |
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237 | exp.X_add_symbol = symbol; |
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238 | exp.X_add_number = 0; |
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239 | emit_expr (&exp, size); |
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240 | } |
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241 | #endif |
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242 | |||
243 | /* Find or create (if CREATE_P) an entry for SEG+SUBSEG in ALL_SEGS. */ |
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244 | |||
245 | static struct line_subseg * |
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246 | get_line_subseg (segT seg, subsegT subseg, bfd_boolean create_p) |
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247 | { |
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6324 | serge | 248 | struct line_seg *s = seg_info (seg)->dwarf2_line_seg; |
5222 | serge | 249 | struct line_subseg **pss, *lss; |
250 | |||
251 | if (s == NULL) |
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252 | { |
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253 | if (!create_p) |
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254 | return NULL; |
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255 | |||
256 | s = (struct line_seg *) xmalloc (sizeof (*s)); |
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257 | s->next = NULL; |
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258 | s->seg = seg; |
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259 | s->head = NULL; |
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260 | *last_seg_ptr = s; |
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261 | last_seg_ptr = &s->next; |
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6324 | serge | 262 | seg_info (seg)->dwarf2_line_seg = s; |
5222 | serge | 263 | } |
264 | gas_assert (seg == s->seg); |
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265 | |||
266 | for (pss = &s->head; (lss = *pss) != NULL ; pss = &lss->next) |
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267 | { |
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268 | if (lss->subseg == subseg) |
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269 | goto found_subseg; |
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270 | if (lss->subseg > subseg) |
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271 | break; |
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272 | } |
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273 | |||
274 | lss = (struct line_subseg *) xmalloc (sizeof (*lss)); |
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275 | lss->next = *pss; |
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276 | lss->subseg = subseg; |
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277 | lss->head = NULL; |
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278 | lss->ptail = &lss->head; |
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279 | lss->pmove_tail = &lss->head; |
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280 | *pss = lss; |
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281 | |||
282 | found_subseg: |
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283 | return lss; |
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284 | } |
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285 | |||
286 | /* Record an entry for LOC occurring at LABEL. */ |
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287 | |||
288 | static void |
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289 | dwarf2_gen_line_info_1 (symbolS *label, struct dwarf2_line_info *loc) |
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290 | { |
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291 | struct line_subseg *lss; |
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292 | struct line_entry *e; |
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293 | |||
294 | e = (struct line_entry *) xmalloc (sizeof (*e)); |
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295 | e->next = NULL; |
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296 | e->label = label; |
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297 | e->loc = *loc; |
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298 | |||
299 | lss = get_line_subseg (now_seg, now_subseg, TRUE); |
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300 | *lss->ptail = e; |
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301 | lss->ptail = &e->next; |
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302 | } |
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303 | |||
304 | /* Record an entry for LOC occurring at OFS within the current fragment. */ |
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305 | |||
306 | void |
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307 | dwarf2_gen_line_info (addressT ofs, struct dwarf2_line_info *loc) |
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308 | { |
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309 | static unsigned int line = -1; |
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310 | static unsigned int filenum = -1; |
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311 | |||
312 | symbolS *sym; |
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313 | |||
314 | /* Early out for as-yet incomplete location information. */ |
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315 | if (loc->filenum == 0 || loc->line == 0) |
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316 | return; |
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317 | |||
318 | /* Don't emit sequences of line symbols for the same line when the |
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319 | symbols apply to assembler code. It is necessary to emit |
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320 | duplicate line symbols when a compiler asks for them, because GDB |
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321 | uses them to determine the end of the prologue. */ |
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322 | if (debug_type == DEBUG_DWARF2 |
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323 | && line == loc->line && filenum == loc->filenum) |
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324 | return; |
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325 | |||
326 | line = loc->line; |
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327 | filenum = loc->filenum; |
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328 | |||
329 | if (linkrelax) |
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330 | { |
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331 | char name[120]; |
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332 | |||
333 | /* Use a non-fake name for the line number location, |
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334 | so that it can be referred to by relocations. */ |
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335 | sprintf (name, ".Loc.%u.%u", line, filenum); |
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336 | sym = symbol_new (name, now_seg, ofs, frag_now); |
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337 | } |
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338 | else |
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339 | sym = symbol_temp_new (now_seg, ofs, frag_now); |
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340 | dwarf2_gen_line_info_1 (sym, loc); |
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341 | } |
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342 | |||
343 | /* Returns the current source information. If .file directives have |
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344 | been encountered, the info for the corresponding source file is |
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345 | returned. Otherwise, the info for the assembly source file is |
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346 | returned. */ |
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347 | |||
348 | void |
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349 | dwarf2_where (struct dwarf2_line_info *line) |
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350 | { |
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351 | if (debug_type == DEBUG_DWARF2) |
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352 | { |
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353 | char *filename; |
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354 | as_where (&filename, &line->line); |
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355 | line->filenum = get_filenum (filename, 0); |
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356 | line->column = 0; |
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357 | line->flags = DWARF2_FLAG_IS_STMT; |
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358 | line->isa = current.isa; |
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359 | line->discriminator = current.discriminator; |
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360 | } |
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361 | else |
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362 | *line = current; |
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363 | } |
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364 | |||
365 | /* A hook to allow the target backend to inform the line number state |
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366 | machine of isa changes when assembler debug info is enabled. */ |
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367 | |||
368 | void |
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369 | dwarf2_set_isa (unsigned int isa) |
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370 | { |
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371 | current.isa = isa; |
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372 | } |
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373 | |||
374 | /* Called for each machine instruction, or relatively atomic group of |
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375 | machine instructions (ie built-in macro). The instruction or group |
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376 | is SIZE bytes in length. If dwarf2 line number generation is called |
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377 | for, emit a line statement appropriately. */ |
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378 | |||
379 | void |
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380 | dwarf2_emit_insn (int size) |
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381 | { |
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382 | struct dwarf2_line_info loc; |
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383 | |||
384 | if (!dwarf2_loc_directive_seen && debug_type != DEBUG_DWARF2) |
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385 | return; |
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386 | |||
387 | dwarf2_where (&loc); |
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388 | |||
389 | dwarf2_gen_line_info (frag_now_fix () - size, &loc); |
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390 | dwarf2_consume_line_info (); |
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391 | } |
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392 | |||
393 | /* Move all previously-emitted line entries for the current position by |
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394 | DELTA bytes. This function cannot be used to move the same entries |
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395 | twice. */ |
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396 | |||
397 | void |
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398 | dwarf2_move_insn (int delta) |
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399 | { |
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400 | struct line_subseg *lss; |
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401 | struct line_entry *e; |
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402 | valueT now; |
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403 | |||
404 | if (delta == 0) |
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405 | return; |
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406 | |||
407 | lss = get_line_subseg (now_seg, now_subseg, FALSE); |
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408 | if (!lss) |
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409 | return; |
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410 | |||
411 | now = frag_now_fix (); |
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412 | while ((e = *lss->pmove_tail)) |
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413 | { |
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414 | if (S_GET_VALUE (e->label) == now) |
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415 | S_SET_VALUE (e->label, now + delta); |
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416 | lss->pmove_tail = &e->next; |
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417 | } |
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418 | } |
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419 | |||
420 | /* Called after the current line information has been either used with |
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421 | dwarf2_gen_line_info or saved with a machine instruction for later use. |
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422 | This resets the state of the line number information to reflect that |
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423 | it has been used. */ |
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424 | |||
425 | void |
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426 | dwarf2_consume_line_info (void) |
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427 | { |
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428 | /* Unless we generate DWARF2 debugging information for each |
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429 | assembler line, we only emit one line symbol for one LOC. */ |
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430 | dwarf2_loc_directive_seen = FALSE; |
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431 | |||
432 | current.flags &= ~(DWARF2_FLAG_BASIC_BLOCK |
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433 | | DWARF2_FLAG_PROLOGUE_END |
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434 | | DWARF2_FLAG_EPILOGUE_BEGIN); |
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435 | current.discriminator = 0; |
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436 | } |
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437 | |||
438 | /* Called for each (preferably code) label. If dwarf2_loc_mark_labels |
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439 | is enabled, emit a basic block marker. */ |
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440 | |||
441 | void |
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442 | dwarf2_emit_label (symbolS *label) |
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443 | { |
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444 | struct dwarf2_line_info loc; |
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445 | |||
446 | if (!dwarf2_loc_mark_labels) |
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447 | return; |
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448 | if (S_GET_SEGMENT (label) != now_seg) |
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449 | return; |
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450 | if (!(bfd_get_section_flags (stdoutput, now_seg) & SEC_CODE)) |
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451 | return; |
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452 | if (files_in_use == 0 && debug_type != DEBUG_DWARF2) |
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453 | return; |
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454 | |||
455 | dwarf2_where (&loc); |
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456 | |||
457 | loc.flags |= DWARF2_FLAG_BASIC_BLOCK; |
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458 | |||
459 | dwarf2_gen_line_info_1 (label, &loc); |
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460 | dwarf2_consume_line_info (); |
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461 | } |
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462 | |||
463 | /* Get a .debug_line file number for FILENAME. If NUM is nonzero, |
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464 | allocate it on that file table slot, otherwise return the first |
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465 | empty one. */ |
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466 | |||
467 | static unsigned int |
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468 | get_filenum (const char *filename, unsigned int num) |
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469 | { |
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470 | static unsigned int last_used, last_used_dir_len; |
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471 | const char *file; |
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472 | size_t dir_len; |
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473 | unsigned int i, dir; |
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474 | |||
475 | if (num == 0 && last_used) |
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476 | { |
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477 | if (! files[last_used].dir |
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478 | && filename_cmp (filename, files[last_used].filename) == 0) |
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479 | return last_used; |
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480 | if (files[last_used].dir |
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481 | && filename_ncmp (filename, dirs[files[last_used].dir], |
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482 | last_used_dir_len) == 0 |
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483 | && IS_DIR_SEPARATOR (filename [last_used_dir_len]) |
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484 | && filename_cmp (filename + last_used_dir_len + 1, |
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485 | files[last_used].filename) == 0) |
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486 | return last_used; |
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487 | } |
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488 | |||
489 | file = lbasename (filename); |
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490 | /* Don't make empty string from / or A: from A:/ . */ |
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491 | #ifdef HAVE_DOS_BASED_FILE_SYSTEM |
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492 | if (file <= filename + 3) |
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493 | file = filename; |
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494 | #else |
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495 | if (file == filename + 1) |
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496 | file = filename; |
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497 | #endif |
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498 | dir_len = file - filename; |
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499 | |||
500 | dir = 0; |
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501 | if (dir_len) |
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502 | { |
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503 | #ifndef DWARF2_DIR_SHOULD_END_WITH_SEPARATOR |
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504 | --dir_len; |
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505 | #endif |
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506 | for (dir = 1; dir < dirs_in_use; ++dir) |
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507 | if (filename_ncmp (filename, dirs[dir], dir_len) == 0 |
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508 | && dirs[dir][dir_len] == '\0') |
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509 | break; |
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510 | |||
511 | if (dir >= dirs_in_use) |
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512 | { |
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513 | if (dir >= dirs_allocated) |
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514 | { |
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515 | dirs_allocated = dir + 32; |
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516 | dirs = (char **) |
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517 | xrealloc (dirs, (dir + 32) * sizeof (const char *)); |
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518 | } |
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519 | |||
520 | dirs[dir] = (char *) xmalloc (dir_len + 1); |
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521 | memcpy (dirs[dir], filename, dir_len); |
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522 | dirs[dir][dir_len] = '\0'; |
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523 | dirs_in_use = dir + 1; |
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524 | } |
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525 | } |
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526 | |||
527 | if (num == 0) |
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528 | { |
||
529 | for (i = 1; i < files_in_use; ++i) |
||
530 | if (files[i].dir == dir |
||
531 | && files[i].filename |
||
532 | && filename_cmp (file, files[i].filename) == 0) |
||
533 | { |
||
534 | last_used = i; |
||
535 | last_used_dir_len = dir_len; |
||
536 | return i; |
||
537 | } |
||
538 | } |
||
539 | else |
||
540 | i = num; |
||
541 | |||
542 | if (i >= files_allocated) |
||
543 | { |
||
544 | unsigned int old = files_allocated; |
||
545 | |||
546 | files_allocated = i + 32; |
||
547 | files = (struct file_entry *) |
||
548 | xrealloc (files, (i + 32) * sizeof (struct file_entry)); |
||
549 | |||
550 | memset (files + old, 0, (i + 32 - old) * sizeof (struct file_entry)); |
||
551 | } |
||
552 | |||
553 | files[i].filename = num ? file : xstrdup (file); |
||
554 | files[i].dir = dir; |
||
555 | if (files_in_use < i + 1) |
||
556 | files_in_use = i + 1; |
||
557 | last_used = i; |
||
558 | last_used_dir_len = dir_len; |
||
559 | |||
560 | return i; |
||
561 | } |
||
562 | |||
563 | /* Handle two forms of .file directive: |
||
564 | - Pass .file "source.c" to s_app_file |
||
565 | - Handle .file 1 "source.c" by adding an entry to the DWARF-2 file table |
||
566 | |||
567 | If an entry is added to the file table, return a pointer to the filename. */ |
||
568 | |||
569 | char * |
||
570 | dwarf2_directive_file (int dummy ATTRIBUTE_UNUSED) |
||
571 | { |
||
572 | offsetT num; |
||
573 | char *filename; |
||
574 | int filename_len; |
||
575 | |||
576 | /* Continue to accept a bare string and pass it off. */ |
||
577 | SKIP_WHITESPACE (); |
||
578 | if (*input_line_pointer == '"') |
||
579 | { |
||
580 | s_app_file (0); |
||
581 | return NULL; |
||
582 | } |
||
583 | |||
584 | num = get_absolute_expression (); |
||
585 | filename = demand_copy_C_string (&filename_len); |
||
586 | if (filename == NULL) |
||
587 | return NULL; |
||
588 | demand_empty_rest_of_line (); |
||
589 | |||
590 | if (num < 1) |
||
591 | { |
||
592 | as_bad (_("file number less than one")); |
||
593 | return NULL; |
||
594 | } |
||
595 | |||
596 | /* A .file directive implies compiler generated debug information is |
||
597 | being supplied. Turn off gas generated debug info. */ |
||
598 | debug_type = DEBUG_NONE; |
||
599 | |||
600 | if (num < (int) files_in_use && files[num].filename != 0) |
||
601 | { |
||
602 | as_bad (_("file number %ld already allocated"), (long) num); |
||
603 | return NULL; |
||
604 | } |
||
605 | |||
606 | get_filenum (filename, num); |
||
607 | |||
608 | return filename; |
||
609 | } |
||
610 | |||
611 | void |
||
612 | dwarf2_directive_loc (int dummy ATTRIBUTE_UNUSED) |
||
613 | { |
||
614 | offsetT filenum, line; |
||
615 | |||
616 | /* If we see two .loc directives in a row, force the first one to be |
||
617 | output now. */ |
||
618 | if (dwarf2_loc_directive_seen) |
||
619 | dwarf2_emit_insn (0); |
||
620 | |||
621 | filenum = get_absolute_expression (); |
||
622 | SKIP_WHITESPACE (); |
||
623 | line = get_absolute_expression (); |
||
624 | |||
625 | if (filenum < 1) |
||
626 | { |
||
627 | as_bad (_("file number less than one")); |
||
628 | return; |
||
629 | } |
||
630 | if (filenum >= (int) files_in_use || files[filenum].filename == 0) |
||
631 | { |
||
632 | as_bad (_("unassigned file number %ld"), (long) filenum); |
||
633 | return; |
||
634 | } |
||
635 | |||
636 | current.filenum = filenum; |
||
637 | current.line = line; |
||
638 | current.discriminator = 0; |
||
639 | |||
640 | #ifndef NO_LISTING |
||
641 | if (listing) |
||
642 | { |
||
643 | if (files[filenum].dir) |
||
644 | { |
||
645 | size_t dir_len = strlen (dirs[files[filenum].dir]); |
||
646 | size_t file_len = strlen (files[filenum].filename); |
||
647 | char *cp = (char *) alloca (dir_len + 1 + file_len + 1); |
||
648 | |||
649 | memcpy (cp, dirs[files[filenum].dir], dir_len); |
||
650 | INSERT_DIR_SEPARATOR (cp, dir_len); |
||
651 | memcpy (cp + dir_len + 1, files[filenum].filename, file_len); |
||
652 | cp[dir_len + file_len + 1] = '\0'; |
||
653 | listing_source_file (cp); |
||
654 | } |
||
655 | else |
||
656 | listing_source_file (files[filenum].filename); |
||
657 | listing_source_line (line); |
||
658 | } |
||
659 | #endif |
||
660 | |||
661 | SKIP_WHITESPACE (); |
||
662 | if (ISDIGIT (*input_line_pointer)) |
||
663 | { |
||
664 | current.column = get_absolute_expression (); |
||
665 | SKIP_WHITESPACE (); |
||
666 | } |
||
667 | |||
668 | while (ISALPHA (*input_line_pointer)) |
||
669 | { |
||
670 | char *p, c; |
||
671 | offsetT value; |
||
672 | |||
6324 | serge | 673 | c = get_symbol_name (& p); |
5222 | serge | 674 | |
675 | if (strcmp (p, "basic_block") == 0) |
||
676 | { |
||
677 | current.flags |= DWARF2_FLAG_BASIC_BLOCK; |
||
678 | *input_line_pointer = c; |
||
679 | } |
||
680 | else if (strcmp (p, "prologue_end") == 0) |
||
681 | { |
||
682 | current.flags |= DWARF2_FLAG_PROLOGUE_END; |
||
683 | *input_line_pointer = c; |
||
684 | } |
||
685 | else if (strcmp (p, "epilogue_begin") == 0) |
||
686 | { |
||
687 | current.flags |= DWARF2_FLAG_EPILOGUE_BEGIN; |
||
688 | *input_line_pointer = c; |
||
689 | } |
||
690 | else if (strcmp (p, "is_stmt") == 0) |
||
691 | { |
||
6324 | serge | 692 | (void) restore_line_pointer (c); |
5222 | serge | 693 | value = get_absolute_expression (); |
694 | if (value == 0) |
||
695 | current.flags &= ~DWARF2_FLAG_IS_STMT; |
||
696 | else if (value == 1) |
||
697 | current.flags |= DWARF2_FLAG_IS_STMT; |
||
698 | else |
||
699 | { |
||
700 | as_bad (_("is_stmt value not 0 or 1")); |
||
701 | return; |
||
702 | } |
||
703 | } |
||
704 | else if (strcmp (p, "isa") == 0) |
||
705 | { |
||
6324 | serge | 706 | (void) restore_line_pointer (c); |
5222 | serge | 707 | value = get_absolute_expression (); |
708 | if (value >= 0) |
||
709 | current.isa = value; |
||
710 | else |
||
711 | { |
||
712 | as_bad (_("isa number less than zero")); |
||
713 | return; |
||
714 | } |
||
715 | } |
||
716 | else if (strcmp (p, "discriminator") == 0) |
||
717 | { |
||
6324 | serge | 718 | (void) restore_line_pointer (c); |
5222 | serge | 719 | value = get_absolute_expression (); |
720 | if (value >= 0) |
||
721 | current.discriminator = value; |
||
722 | else |
||
723 | { |
||
724 | as_bad (_("discriminator less than zero")); |
||
725 | return; |
||
726 | } |
||
727 | } |
||
728 | else |
||
729 | { |
||
730 | as_bad (_("unknown .loc sub-directive `%s'"), p); |
||
6324 | serge | 731 | (void) restore_line_pointer (c); |
5222 | serge | 732 | return; |
733 | } |
||
734 | |||
6324 | serge | 735 | SKIP_WHITESPACE_AFTER_NAME (); |
5222 | serge | 736 | } |
737 | |||
738 | demand_empty_rest_of_line (); |
||
739 | dwarf2_loc_directive_seen = TRUE; |
||
740 | debug_type = DEBUG_NONE; |
||
741 | } |
||
742 | |||
743 | void |
||
744 | dwarf2_directive_loc_mark_labels (int dummy ATTRIBUTE_UNUSED) |
||
745 | { |
||
746 | offsetT value = get_absolute_expression (); |
||
747 | |||
748 | if (value != 0 && value != 1) |
||
749 | { |
||
750 | as_bad (_("expected 0 or 1")); |
||
751 | ignore_rest_of_line (); |
||
752 | } |
||
753 | else |
||
754 | { |
||
755 | dwarf2_loc_mark_labels = value != 0; |
||
756 | demand_empty_rest_of_line (); |
||
757 | } |
||
758 | } |
||
759 | |||
760 | static struct frag * |
||
761 | first_frag_for_seg (segT seg) |
||
762 | { |
||
763 | return seg_info (seg)->frchainP->frch_root; |
||
764 | } |
||
765 | |||
766 | static struct frag * |
||
767 | last_frag_for_seg (segT seg) |
||
768 | { |
||
769 | frchainS *f = seg_info (seg)->frchainP; |
||
770 | |||
771 | while (f->frch_next != NULL) |
||
772 | f = f->frch_next; |
||
773 | |||
774 | return f->frch_last; |
||
775 | } |
||
776 | |||
777 | /* Emit a single byte into the current segment. */ |
||
778 | |||
779 | static inline void |
||
780 | out_byte (int byte) |
||
781 | { |
||
782 | FRAG_APPEND_1_CHAR (byte); |
||
783 | } |
||
784 | |||
785 | /* Emit a statement program opcode into the current segment. */ |
||
786 | |||
787 | static inline void |
||
788 | out_opcode (int opc) |
||
789 | { |
||
790 | out_byte (opc); |
||
791 | } |
||
792 | |||
793 | /* Emit a two-byte word into the current segment. */ |
||
794 | |||
795 | static inline void |
||
796 | out_two (int data) |
||
797 | { |
||
798 | md_number_to_chars (frag_more (2), data, 2); |
||
799 | } |
||
800 | |||
801 | /* Emit a four byte word into the current segment. */ |
||
802 | |||
803 | static inline void |
||
804 | out_four (int data) |
||
805 | { |
||
806 | md_number_to_chars (frag_more (4), data, 4); |
||
807 | } |
||
808 | |||
809 | /* Emit an unsigned "little-endian base 128" number. */ |
||
810 | |||
811 | static void |
||
812 | out_uleb128 (addressT value) |
||
813 | { |
||
814 | output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); |
||
815 | } |
||
816 | |||
817 | /* Emit a signed "little-endian base 128" number. */ |
||
818 | |||
819 | static void |
||
820 | out_leb128 (addressT value) |
||
821 | { |
||
822 | output_leb128 (frag_more (sizeof_leb128 (value, 1)), value, 1); |
||
823 | } |
||
824 | |||
825 | /* Emit a tuple for .debug_abbrev. */ |
||
826 | |||
827 | static inline void |
||
828 | out_abbrev (int name, int form) |
||
829 | { |
||
830 | out_uleb128 (name); |
||
831 | out_uleb128 (form); |
||
832 | } |
||
833 | |||
834 | /* Get the size of a fragment. */ |
||
835 | |||
836 | static offsetT |
||
837 | get_frag_fix (fragS *frag, segT seg) |
||
838 | { |
||
839 | frchainS *fr; |
||
840 | |||
841 | if (frag->fr_next) |
||
842 | return frag->fr_fix; |
||
843 | |||
844 | /* If a fragment is the last in the chain, special measures must be |
||
845 | taken to find its size before relaxation, since it may be pending |
||
846 | on some subsegment chain. */ |
||
847 | for (fr = seg_info (seg)->frchainP; fr; fr = fr->frch_next) |
||
848 | if (fr->frch_last == frag) |
||
849 | return (char *) obstack_next_free (&fr->frch_obstack) - frag->fr_literal; |
||
850 | |||
851 | abort (); |
||
852 | } |
||
853 | |||
854 | /* Set an absolute address (may result in a relocation entry). */ |
||
855 | |||
856 | static void |
||
857 | out_set_addr (symbolS *sym) |
||
858 | { |
||
859 | expressionS exp; |
||
860 | |||
861 | out_opcode (DW_LNS_extended_op); |
||
862 | out_uleb128 (sizeof_address + 1); |
||
863 | |||
864 | out_opcode (DW_LNE_set_address); |
||
865 | exp.X_op = O_symbol; |
||
866 | exp.X_add_symbol = sym; |
||
867 | exp.X_add_number = 0; |
||
868 | emit_expr (&exp, sizeof_address); |
||
869 | } |
||
870 | |||
871 | static void scale_addr_delta (addressT *); |
||
872 | |||
873 | static void |
||
874 | scale_addr_delta (addressT *addr_delta) |
||
875 | { |
||
876 | static int printed_this = 0; |
||
877 | if (DWARF2_LINE_MIN_INSN_LENGTH > 1) |
||
878 | { |
||
879 | if (*addr_delta % DWARF2_LINE_MIN_INSN_LENGTH != 0 && !printed_this) |
||
880 | { |
||
881 | as_bad("unaligned opcodes detected in executable segment"); |
||
882 | printed_this = 1; |
||
883 | } |
||
884 | *addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH; |
||
885 | } |
||
886 | } |
||
887 | |||
888 | /* Encode a pair of line and address skips as efficiently as possible. |
||
889 | Note that the line skip is signed, whereas the address skip is unsigned. |
||
890 | |||
891 | The following two routines *must* be kept in sync. This is |
||
892 | enforced by making emit_inc_line_addr abort if we do not emit |
||
893 | exactly the expected number of bytes. */ |
||
894 | |||
895 | static int |
||
896 | size_inc_line_addr (int line_delta, addressT addr_delta) |
||
897 | { |
||
898 | unsigned int tmp, opcode; |
||
899 | int len = 0; |
||
900 | |||
901 | /* Scale the address delta by the minimum instruction length. */ |
||
902 | scale_addr_delta (&addr_delta); |
||
903 | |||
904 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. |
||
905 | We cannot use special opcodes here, since we want the end_sequence |
||
906 | to emit the matrix entry. */ |
||
907 | if (line_delta == INT_MAX) |
||
908 | { |
||
909 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
||
910 | len = 1; |
||
911 | else |
||
912 | len = 1 + sizeof_leb128 (addr_delta, 0); |
||
913 | return len + 3; |
||
914 | } |
||
915 | |||
916 | /* Bias the line delta by the base. */ |
||
917 | tmp = line_delta - DWARF2_LINE_BASE; |
||
918 | |||
919 | /* If the line increment is out of range of a special opcode, we |
||
920 | must encode it with DW_LNS_advance_line. */ |
||
921 | if (tmp >= DWARF2_LINE_RANGE) |
||
922 | { |
||
923 | len = 1 + sizeof_leb128 (line_delta, 1); |
||
924 | line_delta = 0; |
||
925 | tmp = 0 - DWARF2_LINE_BASE; |
||
926 | } |
||
927 | |||
928 | /* Bias the opcode by the special opcode base. */ |
||
929 | tmp += DWARF2_LINE_OPCODE_BASE; |
||
930 | |||
931 | /* Avoid overflow when addr_delta is large. */ |
||
932 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) |
||
933 | { |
||
934 | /* Try using a special opcode. */ |
||
935 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; |
||
936 | if (opcode <= 255) |
||
937 | return len + 1; |
||
938 | |||
939 | /* Try using DW_LNS_const_add_pc followed by special op. */ |
||
940 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; |
||
941 | if (opcode <= 255) |
||
942 | return len + 2; |
||
943 | } |
||
944 | |||
945 | /* Otherwise use DW_LNS_advance_pc. */ |
||
946 | len += 1 + sizeof_leb128 (addr_delta, 0); |
||
947 | |||
948 | /* DW_LNS_copy or special opcode. */ |
||
949 | len += 1; |
||
950 | |||
951 | return len; |
||
952 | } |
||
953 | |||
954 | static void |
||
955 | emit_inc_line_addr (int line_delta, addressT addr_delta, char *p, int len) |
||
956 | { |
||
957 | unsigned int tmp, opcode; |
||
958 | int need_copy = 0; |
||
959 | char *end = p + len; |
||
960 | |||
961 | /* Line number sequences cannot go backward in addresses. This means |
||
962 | we've incorrectly ordered the statements in the sequence. */ |
||
963 | gas_assert ((offsetT) addr_delta >= 0); |
||
964 | |||
965 | /* Scale the address delta by the minimum instruction length. */ |
||
966 | scale_addr_delta (&addr_delta); |
||
967 | |||
968 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. |
||
969 | We cannot use special opcodes here, since we want the end_sequence |
||
970 | to emit the matrix entry. */ |
||
971 | if (line_delta == INT_MAX) |
||
972 | { |
||
973 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA) |
||
974 | *p++ = DW_LNS_const_add_pc; |
||
975 | else |
||
976 | { |
||
977 | *p++ = DW_LNS_advance_pc; |
||
978 | p += output_leb128 (p, addr_delta, 0); |
||
979 | } |
||
980 | |||
981 | *p++ = DW_LNS_extended_op; |
||
982 | *p++ = 1; |
||
983 | *p++ = DW_LNE_end_sequence; |
||
984 | goto done; |
||
985 | } |
||
986 | |||
987 | /* Bias the line delta by the base. */ |
||
988 | tmp = line_delta - DWARF2_LINE_BASE; |
||
989 | |||
990 | /* If the line increment is out of range of a special opcode, we |
||
991 | must encode it with DW_LNS_advance_line. */ |
||
992 | if (tmp >= DWARF2_LINE_RANGE) |
||
993 | { |
||
994 | *p++ = DW_LNS_advance_line; |
||
995 | p += output_leb128 (p, line_delta, 1); |
||
996 | |||
997 | line_delta = 0; |
||
998 | tmp = 0 - DWARF2_LINE_BASE; |
||
999 | need_copy = 1; |
||
1000 | } |
||
1001 | |||
1002 | /* Prettier, I think, to use DW_LNS_copy instead of a "line +0, addr +0" |
||
1003 | special opcode. */ |
||
1004 | if (line_delta == 0 && addr_delta == 0) |
||
1005 | { |
||
1006 | *p++ = DW_LNS_copy; |
||
1007 | goto done; |
||
1008 | } |
||
1009 | |||
1010 | /* Bias the opcode by the special opcode base. */ |
||
1011 | tmp += DWARF2_LINE_OPCODE_BASE; |
||
1012 | |||
1013 | /* Avoid overflow when addr_delta is large. */ |
||
1014 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) |
||
1015 | { |
||
1016 | /* Try using a special opcode. */ |
||
1017 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE; |
||
1018 | if (opcode <= 255) |
||
1019 | { |
||
1020 | *p++ = opcode; |
||
1021 | goto done; |
||
1022 | } |
||
1023 | |||
1024 | /* Try using DW_LNS_const_add_pc followed by special op. */ |
||
1025 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; |
||
1026 | if (opcode <= 255) |
||
1027 | { |
||
1028 | *p++ = DW_LNS_const_add_pc; |
||
1029 | *p++ = opcode; |
||
1030 | goto done; |
||
1031 | } |
||
1032 | } |
||
1033 | |||
1034 | /* Otherwise use DW_LNS_advance_pc. */ |
||
1035 | *p++ = DW_LNS_advance_pc; |
||
1036 | p += output_leb128 (p, addr_delta, 0); |
||
1037 | |||
1038 | if (need_copy) |
||
1039 | *p++ = DW_LNS_copy; |
||
1040 | else |
||
1041 | *p++ = tmp; |
||
1042 | |||
1043 | done: |
||
1044 | gas_assert (p == end); |
||
1045 | } |
||
1046 | |||
1047 | /* Handy routine to combine calls to the above two routines. */ |
||
1048 | |||
1049 | static void |
||
1050 | out_inc_line_addr (int line_delta, addressT addr_delta) |
||
1051 | { |
||
1052 | int len = size_inc_line_addr (line_delta, addr_delta); |
||
1053 | emit_inc_line_addr (line_delta, addr_delta, frag_more (len), len); |
||
1054 | } |
||
1055 | |||
1056 | /* Write out an alternative form of line and address skips using |
||
1057 | DW_LNS_fixed_advance_pc opcodes. This uses more space than the default |
||
1058 | line and address information, but it is required if linker relaxation |
||
1059 | could change the code offsets. The following two routines *must* be |
||
1060 | kept in sync. */ |
||
1061 | #define ADDR_DELTA_LIMIT 50000 |
||
1062 | |||
1063 | static int |
||
1064 | size_fixed_inc_line_addr (int line_delta, addressT addr_delta) |
||
1065 | { |
||
1066 | int len = 0; |
||
1067 | |||
1068 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. */ |
||
1069 | if (line_delta != INT_MAX) |
||
1070 | len = 1 + sizeof_leb128 (line_delta, 1); |
||
1071 | |||
1072 | if (addr_delta > ADDR_DELTA_LIMIT) |
||
1073 | { |
||
1074 | /* DW_LNS_extended_op */ |
||
1075 | len += 1 + sizeof_leb128 (sizeof_address + 1, 0); |
||
1076 | /* DW_LNE_set_address */ |
||
1077 | len += 1 + sizeof_address; |
||
1078 | } |
||
1079 | else |
||
1080 | /* DW_LNS_fixed_advance_pc */ |
||
1081 | len += 3; |
||
1082 | |||
1083 | if (line_delta == INT_MAX) |
||
1084 | /* DW_LNS_extended_op + DW_LNE_end_sequence */ |
||
1085 | len += 3; |
||
1086 | else |
||
1087 | /* DW_LNS_copy */ |
||
1088 | len += 1; |
||
1089 | |||
1090 | return len; |
||
1091 | } |
||
1092 | |||
1093 | static void |
||
1094 | emit_fixed_inc_line_addr (int line_delta, addressT addr_delta, fragS *frag, |
||
1095 | char *p, int len) |
||
1096 | { |
||
1097 | expressionS *pexp; |
||
1098 | char *end = p + len; |
||
1099 | |||
1100 | /* Line number sequences cannot go backward in addresses. This means |
||
1101 | we've incorrectly ordered the statements in the sequence. */ |
||
1102 | gas_assert ((offsetT) addr_delta >= 0); |
||
1103 | |||
1104 | /* Verify that we have kept in sync with size_fixed_inc_line_addr. */ |
||
1105 | gas_assert (len == size_fixed_inc_line_addr (line_delta, addr_delta)); |
||
1106 | |||
1107 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. */ |
||
1108 | if (line_delta != INT_MAX) |
||
1109 | { |
||
1110 | *p++ = DW_LNS_advance_line; |
||
1111 | p += output_leb128 (p, line_delta, 1); |
||
1112 | } |
||
1113 | |||
1114 | pexp = symbol_get_value_expression (frag->fr_symbol); |
||
1115 | |||
1116 | /* The DW_LNS_fixed_advance_pc opcode has a 2-byte operand so it can |
||
1117 | advance the address by at most 64K. Linker relaxation (without |
||
1118 | which this function would not be used) could change the operand by |
||
1119 | an unknown amount. If the address increment is getting close to |
||
1120 | the limit, just reset the address. */ |
||
1121 | if (addr_delta > ADDR_DELTA_LIMIT) |
||
1122 | { |
||
1123 | symbolS *to_sym; |
||
1124 | expressionS exp; |
||
1125 | |||
1126 | gas_assert (pexp->X_op == O_subtract); |
||
1127 | to_sym = pexp->X_add_symbol; |
||
1128 | |||
1129 | *p++ = DW_LNS_extended_op; |
||
1130 | p += output_leb128 (p, sizeof_address + 1, 0); |
||
1131 | *p++ = DW_LNE_set_address; |
||
1132 | exp.X_op = O_symbol; |
||
1133 | exp.X_add_symbol = to_sym; |
||
1134 | exp.X_add_number = 0; |
||
6324 | serge | 1135 | emit_expr_fix (&exp, sizeof_address, frag, p, TC_PARSE_CONS_RETURN_NONE); |
5222 | serge | 1136 | p += sizeof_address; |
1137 | } |
||
1138 | else |
||
1139 | { |
||
1140 | *p++ = DW_LNS_fixed_advance_pc; |
||
6324 | serge | 1141 | emit_expr_fix (pexp, 2, frag, p, TC_PARSE_CONS_RETURN_NONE); |
5222 | serge | 1142 | p += 2; |
1143 | } |
||
1144 | |||
1145 | if (line_delta == INT_MAX) |
||
1146 | { |
||
1147 | *p++ = DW_LNS_extended_op; |
||
1148 | *p++ = 1; |
||
1149 | *p++ = DW_LNE_end_sequence; |
||
1150 | } |
||
1151 | else |
||
1152 | *p++ = DW_LNS_copy; |
||
1153 | |||
1154 | gas_assert (p == end); |
||
1155 | } |
||
1156 | |||
1157 | /* Generate a variant frag that we can use to relax address/line |
||
1158 | increments between fragments of the target segment. */ |
||
1159 | |||
1160 | static void |
||
1161 | relax_inc_line_addr (int line_delta, symbolS *to_sym, symbolS *from_sym) |
||
1162 | { |
||
1163 | expressionS exp; |
||
1164 | int max_chars; |
||
1165 | |||
1166 | exp.X_op = O_subtract; |
||
1167 | exp.X_add_symbol = to_sym; |
||
1168 | exp.X_op_symbol = from_sym; |
||
1169 | exp.X_add_number = 0; |
||
1170 | |||
1171 | /* The maximum size of the frag is the line delta with a maximum |
||
1172 | sized address delta. */ |
||
1173 | if (DWARF2_USE_FIXED_ADVANCE_PC) |
||
1174 | max_chars = size_fixed_inc_line_addr (line_delta, |
||
1175 | -DWARF2_LINE_MIN_INSN_LENGTH); |
||
1176 | else |
||
1177 | max_chars = size_inc_line_addr (line_delta, -DWARF2_LINE_MIN_INSN_LENGTH); |
||
1178 | |||
1179 | frag_var (rs_dwarf2dbg, max_chars, max_chars, 1, |
||
1180 | make_expr_symbol (&exp), line_delta, NULL); |
||
1181 | } |
||
1182 | |||
1183 | /* The function estimates the size of a rs_dwarf2dbg variant frag |
||
1184 | based on the current values of the symbols. It is called before |
||
1185 | the relaxation loop. We set fr_subtype to the expected length. */ |
||
1186 | |||
1187 | int |
||
1188 | dwarf2dbg_estimate_size_before_relax (fragS *frag) |
||
1189 | { |
||
1190 | offsetT addr_delta; |
||
1191 | int size; |
||
1192 | |||
1193 | addr_delta = resolve_symbol_value (frag->fr_symbol); |
||
1194 | if (DWARF2_USE_FIXED_ADVANCE_PC) |
||
1195 | size = size_fixed_inc_line_addr (frag->fr_offset, addr_delta); |
||
1196 | else |
||
1197 | size = size_inc_line_addr (frag->fr_offset, addr_delta); |
||
1198 | |||
1199 | frag->fr_subtype = size; |
||
1200 | |||
1201 | return size; |
||
1202 | } |
||
1203 | |||
1204 | /* This function relaxes a rs_dwarf2dbg variant frag based on the |
||
1205 | current values of the symbols. fr_subtype is the current length |
||
1206 | of the frag. This returns the change in frag length. */ |
||
1207 | |||
1208 | int |
||
1209 | dwarf2dbg_relax_frag (fragS *frag) |
||
1210 | { |
||
1211 | int old_size, new_size; |
||
1212 | |||
1213 | old_size = frag->fr_subtype; |
||
1214 | new_size = dwarf2dbg_estimate_size_before_relax (frag); |
||
1215 | |||
1216 | return new_size - old_size; |
||
1217 | } |
||
1218 | |||
1219 | /* This function converts a rs_dwarf2dbg variant frag into a normal |
||
1220 | fill frag. This is called after all relaxation has been done. |
||
1221 | fr_subtype will be the desired length of the frag. */ |
||
1222 | |||
1223 | void |
||
1224 | dwarf2dbg_convert_frag (fragS *frag) |
||
1225 | { |
||
1226 | offsetT addr_diff; |
||
1227 | |||
1228 | if (DWARF2_USE_FIXED_ADVANCE_PC) |
||
1229 | { |
||
1230 | /* If linker relaxation is enabled then the distance bewteen the two |
||
1231 | symbols in the frag->fr_symbol expression might change. Hence we |
||
1232 | cannot rely upon the value computed by resolve_symbol_value. |
||
1233 | Instead we leave the expression unfinalized and allow |
||
1234 | emit_fixed_inc_line_addr to create a fixup (which later becomes a |
||
1235 | relocation) that will allow the linker to correctly compute the |
||
1236 | actual address difference. We have to use a fixed line advance for |
||
1237 | this as we cannot (easily) relocate leb128 encoded values. */ |
||
1238 | int saved_finalize_syms = finalize_syms; |
||
1239 | |||
1240 | finalize_syms = 0; |
||
1241 | addr_diff = resolve_symbol_value (frag->fr_symbol); |
||
1242 | finalize_syms = saved_finalize_syms; |
||
1243 | } |
||
1244 | else |
||
1245 | addr_diff = resolve_symbol_value (frag->fr_symbol); |
||
1246 | |||
1247 | /* fr_var carries the max_chars that we created the fragment with. |
||
1248 | fr_subtype carries the current expected length. We must, of |
||
1249 | course, have allocated enough memory earlier. */ |
||
1250 | gas_assert (frag->fr_var >= (int) frag->fr_subtype); |
||
1251 | |||
1252 | if (DWARF2_USE_FIXED_ADVANCE_PC) |
||
1253 | emit_fixed_inc_line_addr (frag->fr_offset, addr_diff, frag, |
||
1254 | frag->fr_literal + frag->fr_fix, |
||
1255 | frag->fr_subtype); |
||
1256 | else |
||
1257 | emit_inc_line_addr (frag->fr_offset, addr_diff, |
||
1258 | frag->fr_literal + frag->fr_fix, frag->fr_subtype); |
||
1259 | |||
1260 | frag->fr_fix += frag->fr_subtype; |
||
1261 | frag->fr_type = rs_fill; |
||
1262 | frag->fr_var = 0; |
||
1263 | frag->fr_offset = 0; |
||
1264 | } |
||
1265 | |||
1266 | /* Generate .debug_line content for the chain of line number entries |
||
1267 | beginning at E, for segment SEG. */ |
||
1268 | |||
1269 | static void |
||
1270 | process_entries (segT seg, struct line_entry *e) |
||
1271 | { |
||
1272 | unsigned filenum = 1; |
||
1273 | unsigned line = 1; |
||
1274 | unsigned column = 0; |
||
1275 | unsigned isa = 0; |
||
1276 | unsigned flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0; |
||
1277 | fragS *last_frag = NULL, *frag; |
||
1278 | addressT last_frag_ofs = 0, frag_ofs; |
||
1279 | symbolS *last_lab = NULL, *lab; |
||
1280 | struct line_entry *next; |
||
1281 | |||
1282 | if (flag_dwarf_sections) |
||
1283 | { |
||
1284 | char * name; |
||
1285 | const char * sec_name; |
||
1286 | |||
1287 | /* Switch to the relevent sub-section before we start to emit |
||
1288 | the line number table. |
||
1289 | |||
1290 | FIXME: These sub-sections do not have a normal Line Number |
||
1291 | Program Header, thus strictly speaking they are not valid |
||
1292 | DWARF sections. Unfortunately the DWARF standard assumes |
||
1293 | a one-to-one relationship between compilation units and |
||
1294 | line number tables. Thus we have to have a .debug_line |
||
1295 | section, as well as our sub-sections, and we have to ensure |
||
1296 | that all of the sub-sections are merged into a proper |
||
1297 | .debug_line section before a debugger sees them. */ |
||
6324 | serge | 1298 | |
5222 | serge | 1299 | sec_name = bfd_get_section_name (stdoutput, seg); |
1300 | if (strcmp (sec_name, ".text") != 0) |
||
1301 | { |
||
1302 | unsigned int len; |
||
1303 | |||
1304 | len = strlen (sec_name); |
||
1305 | name = xmalloc (len + 11 + 2); |
||
1306 | sprintf (name, ".debug_line%s", sec_name); |
||
1307 | subseg_set (subseg_get (name, FALSE), 0); |
||
1308 | } |
||
1309 | else |
||
1310 | /* Don't create a .debug_line.text section - |
||
1311 | that is redundant. Instead just switch back to the |
||
1312 | normal .debug_line section. */ |
||
1313 | subseg_set (subseg_get (".debug_line", FALSE), 0); |
||
1314 | } |
||
1315 | |||
1316 | do |
||
1317 | { |
||
1318 | int line_delta; |
||
1319 | |||
1320 | if (filenum != e->loc.filenum) |
||
1321 | { |
||
1322 | filenum = e->loc.filenum; |
||
1323 | out_opcode (DW_LNS_set_file); |
||
1324 | out_uleb128 (filenum); |
||
1325 | } |
||
1326 | |||
1327 | if (column != e->loc.column) |
||
1328 | { |
||
1329 | column = e->loc.column; |
||
1330 | out_opcode (DW_LNS_set_column); |
||
1331 | out_uleb128 (column); |
||
1332 | } |
||
1333 | |||
1334 | if (e->loc.discriminator != 0) |
||
1335 | { |
||
1336 | out_opcode (DW_LNS_extended_op); |
||
1337 | out_leb128 (1 + sizeof_leb128 (e->loc.discriminator, 0)); |
||
1338 | out_opcode (DW_LNE_set_discriminator); |
||
1339 | out_uleb128 (e->loc.discriminator); |
||
1340 | } |
||
1341 | |||
1342 | if (isa != e->loc.isa) |
||
1343 | { |
||
1344 | isa = e->loc.isa; |
||
1345 | out_opcode (DW_LNS_set_isa); |
||
1346 | out_uleb128 (isa); |
||
1347 | } |
||
1348 | |||
1349 | if ((e->loc.flags ^ flags) & DWARF2_FLAG_IS_STMT) |
||
1350 | { |
||
1351 | flags = e->loc.flags; |
||
1352 | out_opcode (DW_LNS_negate_stmt); |
||
1353 | } |
||
1354 | |||
1355 | if (e->loc.flags & DWARF2_FLAG_BASIC_BLOCK) |
||
1356 | out_opcode (DW_LNS_set_basic_block); |
||
1357 | |||
1358 | if (e->loc.flags & DWARF2_FLAG_PROLOGUE_END) |
||
1359 | out_opcode (DW_LNS_set_prologue_end); |
||
1360 | |||
1361 | if (e->loc.flags & DWARF2_FLAG_EPILOGUE_BEGIN) |
||
1362 | out_opcode (DW_LNS_set_epilogue_begin); |
||
1363 | |||
1364 | /* Don't try to optimize away redundant entries; gdb wants two |
||
1365 | entries for a function where the code starts on the same line as |
||
1366 | the {, and there's no way to identify that case here. Trust gcc |
||
1367 | to optimize appropriately. */ |
||
1368 | line_delta = e->loc.line - line; |
||
1369 | lab = e->label; |
||
1370 | frag = symbol_get_frag (lab); |
||
1371 | frag_ofs = S_GET_VALUE (lab); |
||
1372 | |||
1373 | if (last_frag == NULL) |
||
1374 | { |
||
1375 | out_set_addr (lab); |
||
1376 | out_inc_line_addr (line_delta, 0); |
||
1377 | } |
||
1378 | else if (frag == last_frag && ! DWARF2_USE_FIXED_ADVANCE_PC) |
||
1379 | out_inc_line_addr (line_delta, frag_ofs - last_frag_ofs); |
||
1380 | else |
||
1381 | relax_inc_line_addr (line_delta, lab, last_lab); |
||
1382 | |||
1383 | line = e->loc.line; |
||
1384 | last_lab = lab; |
||
1385 | last_frag = frag; |
||
1386 | last_frag_ofs = frag_ofs; |
||
1387 | |||
1388 | next = e->next; |
||
1389 | free (e); |
||
1390 | e = next; |
||
1391 | } |
||
1392 | while (e); |
||
1393 | |||
1394 | /* Emit a DW_LNE_end_sequence for the end of the section. */ |
||
1395 | frag = last_frag_for_seg (seg); |
||
1396 | frag_ofs = get_frag_fix (frag, seg); |
||
1397 | if (frag == last_frag && ! DWARF2_USE_FIXED_ADVANCE_PC) |
||
1398 | out_inc_line_addr (INT_MAX, frag_ofs - last_frag_ofs); |
||
1399 | else |
||
1400 | { |
||
1401 | lab = symbol_temp_new (seg, frag_ofs, frag); |
||
1402 | relax_inc_line_addr (INT_MAX, lab, last_lab); |
||
1403 | } |
||
1404 | } |
||
1405 | |||
1406 | /* Emit the directory and file tables for .debug_line. */ |
||
1407 | |||
1408 | static void |
||
1409 | out_file_list (void) |
||
1410 | { |
||
1411 | size_t size; |
||
1412 | const char *dir; |
||
1413 | char *cp; |
||
1414 | unsigned int i; |
||
1415 | |||
1416 | /* Emit directory list. */ |
||
1417 | for (i = 1; i < dirs_in_use; ++i) |
||
1418 | { |
||
1419 | dir = remap_debug_filename (dirs[i]); |
||
1420 | size = strlen (dir) + 1; |
||
1421 | cp = frag_more (size); |
||
1422 | memcpy (cp, dir, size); |
||
1423 | } |
||
1424 | /* Terminate it. */ |
||
1425 | out_byte ('\0'); |
||
1426 | |||
1427 | for (i = 1; i < files_in_use; ++i) |
||
1428 | { |
||
1429 | const char *fullfilename; |
||
1430 | |||
1431 | if (files[i].filename == NULL) |
||
1432 | { |
||
1433 | as_bad (_("unassigned file number %ld"), (long) i); |
||
1434 | /* Prevent a crash later, particularly for file 1. */ |
||
1435 | files[i].filename = ""; |
||
1436 | continue; |
||
1437 | } |
||
1438 | |||
1439 | fullfilename = DWARF2_FILE_NAME (files[i].filename, |
||
1440 | files[i].dir ? dirs [files [i].dir] : ""); |
||
1441 | size = strlen (fullfilename) + 1; |
||
1442 | cp = frag_more (size); |
||
1443 | memcpy (cp, fullfilename, size); |
||
1444 | |||
1445 | out_uleb128 (files[i].dir); /* directory number */ |
||
1446 | /* Output the last modification timestamp. */ |
||
1447 | out_uleb128 (DWARF2_FILE_TIME_NAME (files[i].filename, |
||
1448 | files[i].dir ? dirs [files [i].dir] : "")); |
||
1449 | /* Output the filesize. */ |
||
1450 | out_uleb128 (DWARF2_FILE_SIZE_NAME (files[i].filename, |
||
1451 | files[i].dir ? dirs [files [i].dir] : "")); |
||
1452 | } |
||
1453 | |||
1454 | /* Terminate filename list. */ |
||
1455 | out_byte (0); |
||
1456 | } |
||
1457 | |||
1458 | /* Switch to SEC and output a header length field. Return the size of |
||
1459 | offsets used in SEC. The caller must set EXPR->X_add_symbol value |
||
6324 | serge | 1460 | to the end of the section. EXPR->X_add_number will be set to the |
1461 | negative size of the header. */ |
||
5222 | serge | 1462 | |
1463 | static int |
||
1464 | out_header (asection *sec, expressionS *exp) |
||
1465 | { |
||
1466 | symbolS *start_sym; |
||
1467 | symbolS *end_sym; |
||
1468 | |||
1469 | subseg_set (sec, 0); |
||
1470 | |||
6324 | serge | 1471 | if (flag_dwarf_sections) |
1472 | { |
||
1473 | /* If we are going to put the start and end symbols in different |
||
1474 | sections, then we need real symbols, not just fake, local ones. */ |
||
1475 | frag_now_fix (); |
||
1476 | start_sym = symbol_make (".Ldebug_line_start"); |
||
1477 | end_sym = symbol_make (".Ldebug_line_end"); |
||
1478 | symbol_set_value_now (start_sym); |
||
1479 | } |
||
1480 | else |
||
1481 | { |
||
1482 | start_sym = symbol_temp_new_now (); |
||
1483 | end_sym = symbol_temp_make (); |
||
1484 | } |
||
1485 | |||
5222 | serge | 1486 | /* Total length of the information. */ |
1487 | exp->X_op = O_subtract; |
||
1488 | exp->X_add_symbol = end_sym; |
||
1489 | exp->X_op_symbol = start_sym; |
||
1490 | |||
1491 | switch (DWARF2_FORMAT (sec)) |
||
1492 | { |
||
1493 | case dwarf2_format_32bit: |
||
1494 | exp->X_add_number = -4; |
||
1495 | emit_expr (exp, 4); |
||
1496 | return 4; |
||
1497 | |||
1498 | case dwarf2_format_64bit: |
||
1499 | exp->X_add_number = -12; |
||
1500 | out_four (-1); |
||
1501 | emit_expr (exp, 8); |
||
1502 | return 8; |
||
1503 | |||
1504 | case dwarf2_format_64bit_irix: |
||
1505 | exp->X_add_number = -8; |
||
1506 | emit_expr (exp, 8); |
||
1507 | return 8; |
||
1508 | } |
||
1509 | |||
1510 | as_fatal (_("internal error: unknown dwarf2 format")); |
||
1511 | return 0; |
||
1512 | } |
||
1513 | |||
1514 | /* Emit the collected .debug_line data. */ |
||
1515 | |||
1516 | static void |
||
1517 | out_debug_line (segT line_seg) |
||
1518 | { |
||
1519 | expressionS exp; |
||
6324 | serge | 1520 | symbolS *prologue_start, *prologue_end; |
5222 | serge | 1521 | symbolS *line_end; |
1522 | struct line_seg *s; |
||
1523 | int sizeof_offset; |
||
1524 | |||
1525 | sizeof_offset = out_header (line_seg, &exp); |
||
1526 | line_end = exp.X_add_symbol; |
||
1527 | |||
1528 | /* Version. */ |
||
1529 | out_two (DWARF2_LINE_VERSION); |
||
1530 | |||
1531 | /* Length of the prologue following this length. */ |
||
6324 | serge | 1532 | prologue_start = symbol_temp_make (); |
5222 | serge | 1533 | prologue_end = symbol_temp_make (); |
6324 | serge | 1534 | exp.X_op = O_subtract; |
5222 | serge | 1535 | exp.X_add_symbol = prologue_end; |
6324 | serge | 1536 | exp.X_op_symbol = prologue_start; |
1537 | exp.X_add_number = 0; |
||
5222 | serge | 1538 | emit_expr (&exp, sizeof_offset); |
6324 | serge | 1539 | symbol_set_value_now (prologue_start); |
5222 | serge | 1540 | |
1541 | /* Parameters of the state machine. */ |
||
1542 | out_byte (DWARF2_LINE_MIN_INSN_LENGTH); |
||
1543 | out_byte (DWARF2_LINE_DEFAULT_IS_STMT); |
||
1544 | out_byte (DWARF2_LINE_BASE); |
||
1545 | out_byte (DWARF2_LINE_RANGE); |
||
1546 | out_byte (DWARF2_LINE_OPCODE_BASE); |
||
1547 | |||
1548 | /* Standard opcode lengths. */ |
||
1549 | out_byte (0); /* DW_LNS_copy */ |
||
1550 | out_byte (1); /* DW_LNS_advance_pc */ |
||
1551 | out_byte (1); /* DW_LNS_advance_line */ |
||
1552 | out_byte (1); /* DW_LNS_set_file */ |
||
1553 | out_byte (1); /* DW_LNS_set_column */ |
||
1554 | out_byte (0); /* DW_LNS_negate_stmt */ |
||
1555 | out_byte (0); /* DW_LNS_set_basic_block */ |
||
1556 | out_byte (0); /* DW_LNS_const_add_pc */ |
||
1557 | out_byte (1); /* DW_LNS_fixed_advance_pc */ |
||
1558 | out_byte (0); /* DW_LNS_set_prologue_end */ |
||
1559 | out_byte (0); /* DW_LNS_set_epilogue_begin */ |
||
1560 | out_byte (1); /* DW_LNS_set_isa */ |
||
1561 | |||
1562 | out_file_list (); |
||
1563 | |||
1564 | symbol_set_value_now (prologue_end); |
||
1565 | |||
1566 | /* For each section, emit a statement program. */ |
||
1567 | for (s = all_segs; s; s = s->next) |
||
1568 | if (SEG_NORMAL (s->seg)) |
||
1569 | process_entries (s->seg, s->head->head); |
||
1570 | else |
||
1571 | as_warn ("dwarf line number information for %s ignored", |
||
1572 | segment_name (s->seg)); |
||
1573 | |||
1574 | if (flag_dwarf_sections) |
||
1575 | /* We have to switch to the special .debug_line_end section |
||
1576 | before emitting the end-of-debug_line symbol. The linker |
||
1577 | script arranges for this section to be placed after all the |
||
1578 | (potentially garbage collected) .debug_line. |
||
1579 | This section contains the line_end symbol which is used to |
||
1580 | compute the size of the linked .debug_line section, as seen |
||
1581 | in the DWARF Line Number header. */ |
||
1582 | subseg_set (subseg_get (".debug_line_end", FALSE), 0); |
||
1583 | |||
1584 | symbol_set_value_now (line_end); |
||
1585 | } |
||
1586 | |||
1587 | static void |
||
1588 | out_debug_ranges (segT ranges_seg) |
||
1589 | { |
||
1590 | unsigned int addr_size = sizeof_address; |
||
1591 | struct line_seg *s; |
||
1592 | expressionS exp; |
||
1593 | unsigned int i; |
||
1594 | |||
1595 | subseg_set (ranges_seg, 0); |
||
1596 | |||
1597 | /* Base Address Entry. */ |
||
1598 | for (i = 0; i < addr_size; i++) |
||
1599 | out_byte (0xff); |
||
1600 | for (i = 0; i < addr_size; i++) |
||
1601 | out_byte (0); |
||
1602 | |||
1603 | /* Range List Entry. */ |
||
1604 | for (s = all_segs; s; s = s->next) |
||
1605 | { |
||
1606 | fragS *frag; |
||
1607 | symbolS *beg, *end; |
||
1608 | |||
1609 | frag = first_frag_for_seg (s->seg); |
||
1610 | beg = symbol_temp_new (s->seg, 0, frag); |
||
1611 | s->text_start = beg; |
||
1612 | |||
1613 | frag = last_frag_for_seg (s->seg); |
||
1614 | end = symbol_temp_new (s->seg, get_frag_fix (frag, s->seg), frag); |
||
1615 | s->text_end = end; |
||
1616 | |||
1617 | exp.X_op = O_symbol; |
||
1618 | exp.X_add_symbol = beg; |
||
1619 | exp.X_add_number = 0; |
||
1620 | emit_expr (&exp, addr_size); |
||
1621 | |||
1622 | exp.X_op = O_symbol; |
||
1623 | exp.X_add_symbol = end; |
||
1624 | exp.X_add_number = 0; |
||
1625 | emit_expr (&exp, addr_size); |
||
1626 | } |
||
1627 | |||
1628 | /* End of Range Entry. */ |
||
1629 | for (i = 0; i < addr_size; i++) |
||
1630 | out_byte (0); |
||
1631 | for (i = 0; i < addr_size; i++) |
||
1632 | out_byte (0); |
||
1633 | } |
||
1634 | |||
1635 | /* Emit data for .debug_aranges. */ |
||
1636 | |||
1637 | static void |
||
1638 | out_debug_aranges (segT aranges_seg, segT info_seg) |
||
1639 | { |
||
1640 | unsigned int addr_size = sizeof_address; |
||
6324 | serge | 1641 | offsetT size; |
5222 | serge | 1642 | struct line_seg *s; |
1643 | expressionS exp; |
||
1644 | symbolS *aranges_end; |
||
1645 | char *p; |
||
1646 | int sizeof_offset; |
||
1647 | |||
1648 | sizeof_offset = out_header (aranges_seg, &exp); |
||
1649 | aranges_end = exp.X_add_symbol; |
||
6324 | serge | 1650 | size = -exp.X_add_number; |
5222 | serge | 1651 | |
1652 | /* Version. */ |
||
1653 | out_two (DWARF2_ARANGES_VERSION); |
||
6324 | serge | 1654 | size += 2; |
5222 | serge | 1655 | |
1656 | /* Offset to .debug_info. */ |
||
1657 | TC_DWARF2_EMIT_OFFSET (section_symbol (info_seg), sizeof_offset); |
||
6324 | serge | 1658 | size += sizeof_offset; |
5222 | serge | 1659 | |
1660 | /* Size of an address (offset portion). */ |
||
1661 | out_byte (addr_size); |
||
6324 | serge | 1662 | size++; |
5222 | serge | 1663 | |
1664 | /* Size of a segment descriptor. */ |
||
1665 | out_byte (0); |
||
6324 | serge | 1666 | size++; |
5222 | serge | 1667 | |
1668 | /* Align the header. */ |
||
6324 | serge | 1669 | while ((size++ % (2 * addr_size)) > 0) |
1670 | out_byte (0); |
||
5222 | serge | 1671 | |
1672 | for (s = all_segs; s; s = s->next) |
||
1673 | { |
||
1674 | fragS *frag; |
||
1675 | symbolS *beg, *end; |
||
1676 | |||
1677 | frag = first_frag_for_seg (s->seg); |
||
1678 | beg = symbol_temp_new (s->seg, 0, frag); |
||
1679 | s->text_start = beg; |
||
1680 | |||
1681 | frag = last_frag_for_seg (s->seg); |
||
1682 | end = symbol_temp_new (s->seg, get_frag_fix (frag, s->seg), frag); |
||
1683 | s->text_end = end; |
||
1684 | |||
1685 | exp.X_op = O_symbol; |
||
1686 | exp.X_add_symbol = beg; |
||
1687 | exp.X_add_number = 0; |
||
1688 | emit_expr (&exp, addr_size); |
||
1689 | |||
1690 | exp.X_op = O_subtract; |
||
1691 | exp.X_add_symbol = end; |
||
1692 | exp.X_op_symbol = beg; |
||
1693 | exp.X_add_number = 0; |
||
1694 | emit_expr (&exp, addr_size); |
||
1695 | } |
||
1696 | |||
1697 | p = frag_more (2 * addr_size); |
||
1698 | md_number_to_chars (p, 0, addr_size); |
||
1699 | md_number_to_chars (p + addr_size, 0, addr_size); |
||
1700 | |||
1701 | symbol_set_value_now (aranges_end); |
||
1702 | } |
||
1703 | |||
1704 | /* Emit data for .debug_abbrev. Note that this must be kept in |
||
1705 | sync with out_debug_info below. */ |
||
1706 | |||
1707 | static void |
||
1708 | out_debug_abbrev (segT abbrev_seg, |
||
1709 | segT info_seg ATTRIBUTE_UNUSED, |
||
1710 | segT line_seg ATTRIBUTE_UNUSED) |
||
1711 | { |
||
1712 | subseg_set (abbrev_seg, 0); |
||
1713 | |||
1714 | out_uleb128 (1); |
||
1715 | out_uleb128 (DW_TAG_compile_unit); |
||
1716 | out_byte (DW_CHILDREN_no); |
||
1717 | if (DWARF2_FORMAT (line_seg) == dwarf2_format_32bit) |
||
1718 | out_abbrev (DW_AT_stmt_list, DW_FORM_data4); |
||
1719 | else |
||
1720 | out_abbrev (DW_AT_stmt_list, DW_FORM_data8); |
||
1721 | if (all_segs->next == NULL) |
||
1722 | { |
||
1723 | out_abbrev (DW_AT_low_pc, DW_FORM_addr); |
||
1724 | if (DWARF2_VERSION < 4) |
||
1725 | out_abbrev (DW_AT_high_pc, DW_FORM_addr); |
||
1726 | else |
||
1727 | out_abbrev (DW_AT_high_pc, (sizeof_address == 4 |
||
1728 | ? DW_FORM_data4 : DW_FORM_data8)); |
||
1729 | } |
||
1730 | else |
||
1731 | { |
||
1732 | if (DWARF2_FORMAT (info_seg) == dwarf2_format_32bit) |
||
1733 | out_abbrev (DW_AT_ranges, DW_FORM_data4); |
||
1734 | else |
||
1735 | out_abbrev (DW_AT_ranges, DW_FORM_data8); |
||
1736 | } |
||
1737 | out_abbrev (DW_AT_name, DW_FORM_string); |
||
1738 | out_abbrev (DW_AT_comp_dir, DW_FORM_string); |
||
1739 | out_abbrev (DW_AT_producer, DW_FORM_string); |
||
1740 | out_abbrev (DW_AT_language, DW_FORM_data2); |
||
1741 | out_abbrev (0, 0); |
||
1742 | |||
1743 | /* Terminate the abbreviations for this compilation unit. */ |
||
1744 | out_byte (0); |
||
1745 | } |
||
1746 | |||
1747 | /* Emit a description of this compilation unit for .debug_info. */ |
||
1748 | |||
1749 | static void |
||
1750 | out_debug_info (segT info_seg, segT abbrev_seg, segT line_seg, segT ranges_seg) |
||
1751 | { |
||
1752 | char producer[128]; |
||
1753 | const char *comp_dir; |
||
1754 | const char *dirname; |
||
1755 | expressionS exp; |
||
1756 | symbolS *info_end; |
||
1757 | char *p; |
||
1758 | int len; |
||
1759 | int sizeof_offset; |
||
1760 | |||
1761 | sizeof_offset = out_header (info_seg, &exp); |
||
1762 | info_end = exp.X_add_symbol; |
||
1763 | |||
1764 | /* DWARF version. */ |
||
1765 | out_two (DWARF2_VERSION); |
||
1766 | |||
1767 | /* .debug_abbrev offset */ |
||
1768 | TC_DWARF2_EMIT_OFFSET (section_symbol (abbrev_seg), sizeof_offset); |
||
1769 | |||
1770 | /* Target address size. */ |
||
1771 | out_byte (sizeof_address); |
||
1772 | |||
1773 | /* DW_TAG_compile_unit DIE abbrev */ |
||
1774 | out_uleb128 (1); |
||
1775 | |||
1776 | /* DW_AT_stmt_list */ |
||
1777 | TC_DWARF2_EMIT_OFFSET (section_symbol (line_seg), |
||
1778 | (DWARF2_FORMAT (line_seg) == dwarf2_format_32bit |
||
1779 | ? 4 : 8)); |
||
1780 | |||
1781 | /* These two attributes are emitted if all of the code is contiguous. */ |
||
1782 | if (all_segs->next == NULL) |
||
1783 | { |
||
1784 | /* DW_AT_low_pc */ |
||
1785 | exp.X_op = O_symbol; |
||
1786 | exp.X_add_symbol = all_segs->text_start; |
||
1787 | exp.X_add_number = 0; |
||
1788 | emit_expr (&exp, sizeof_address); |
||
1789 | |||
1790 | /* DW_AT_high_pc */ |
||
1791 | if (DWARF2_VERSION < 4) |
||
1792 | exp.X_op = O_symbol; |
||
1793 | else |
||
1794 | { |
||
1795 | exp.X_op = O_subtract; |
||
1796 | exp.X_op_symbol = all_segs->text_start; |
||
1797 | } |
||
1798 | exp.X_add_symbol = all_segs->text_end; |
||
1799 | exp.X_add_number = 0; |
||
1800 | emit_expr (&exp, sizeof_address); |
||
1801 | } |
||
1802 | else |
||
1803 | { |
||
1804 | /* This attribute is emitted if the code is disjoint. */ |
||
1805 | /* DW_AT_ranges. */ |
||
1806 | TC_DWARF2_EMIT_OFFSET (section_symbol (ranges_seg), sizeof_offset); |
||
1807 | } |
||
1808 | |||
1809 | /* DW_AT_name. We don't have the actual file name that was present |
||
1810 | on the command line, so assume files[1] is the main input file. |
||
1811 | We're not supposed to get called unless at least one line number |
||
1812 | entry was emitted, so this should always be defined. */ |
||
1813 | if (files_in_use == 0) |
||
1814 | abort (); |
||
1815 | if (files[1].dir) |
||
1816 | { |
||
1817 | dirname = remap_debug_filename (dirs[files[1].dir]); |
||
1818 | len = strlen (dirname); |
||
1819 | #ifdef TE_VMS |
||
1820 | /* Already has trailing slash. */ |
||
1821 | p = frag_more (len); |
||
1822 | memcpy (p, dirname, len); |
||
1823 | #else |
||
1824 | p = frag_more (len + 1); |
||
1825 | memcpy (p, dirname, len); |
||
1826 | INSERT_DIR_SEPARATOR (p, len); |
||
1827 | #endif |
||
1828 | } |
||
1829 | len = strlen (files[1].filename) + 1; |
||
1830 | p = frag_more (len); |
||
1831 | memcpy (p, files[1].filename, len); |
||
1832 | |||
1833 | /* DW_AT_comp_dir */ |
||
1834 | comp_dir = remap_debug_filename (getpwd ()); |
||
1835 | len = strlen (comp_dir) + 1; |
||
1836 | p = frag_more (len); |
||
1837 | memcpy (p, comp_dir, len); |
||
1838 | |||
1839 | /* DW_AT_producer */ |
||
1840 | sprintf (producer, "GNU AS %s", VERSION); |
||
1841 | len = strlen (producer) + 1; |
||
1842 | p = frag_more (len); |
||
1843 | memcpy (p, producer, len); |
||
1844 | |||
1845 | /* DW_AT_language. Yes, this is probably not really MIPS, but the |
||
1846 | dwarf2 draft has no standard code for assembler. */ |
||
1847 | out_two (DW_LANG_Mips_Assembler); |
||
1848 | |||
1849 | symbol_set_value_now (info_end); |
||
1850 | } |
||
1851 | |||
1852 | void |
||
1853 | dwarf2_init (void) |
||
1854 | { |
||
1855 | last_seg_ptr = &all_segs; |
||
1856 | } |
||
1857 | |||
1858 | |||
1859 | /* Finish the dwarf2 debug sections. We emit .debug.line if there |
||
1860 | were any .file/.loc directives, or --gdwarf2 was given, or if the |
||
1861 | file has a non-empty .debug_info section and an empty .debug_line |
||
1862 | section. If we emit .debug_line, and the .debug_info section is |
||
1863 | empty, we also emit .debug_info, .debug_aranges and .debug_abbrev. |
||
1864 | ALL_SEGS will be non-null if there were any .file/.loc directives, |
||
1865 | or --gdwarf2 was given and there were any located instructions |
||
1866 | emitted. */ |
||
1867 | |||
1868 | void |
||
1869 | dwarf2_finish (void) |
||
1870 | { |
||
1871 | segT line_seg; |
||
1872 | struct line_seg *s; |
||
1873 | segT info_seg; |
||
1874 | int emit_other_sections = 0; |
||
1875 | int empty_debug_line = 0; |
||
1876 | |||
1877 | info_seg = bfd_get_section_by_name (stdoutput, ".debug_info"); |
||
1878 | emit_other_sections = info_seg == NULL || !seg_not_empty_p (info_seg); |
||
1879 | |||
1880 | line_seg = bfd_get_section_by_name (stdoutput, ".debug_line"); |
||
1881 | empty_debug_line = line_seg == NULL || !seg_not_empty_p (line_seg); |
||
1882 | |||
1883 | /* We can't construct a new debug_line section if we already have one. |
||
1884 | Give an error. */ |
||
1885 | if (all_segs && !empty_debug_line) |
||
1886 | as_fatal ("duplicate .debug_line sections"); |
||
1887 | |||
1888 | if ((!all_segs && emit_other_sections) |
||
1889 | || (!emit_other_sections && !empty_debug_line)) |
||
1890 | /* If there is no line information and no non-empty .debug_info |
||
1891 | section, or if there is both a non-empty .debug_info and a non-empty |
||
1892 | .debug_line, then we do nothing. */ |
||
1893 | return; |
||
1894 | |||
1895 | /* Calculate the size of an address for the target machine. */ |
||
1896 | sizeof_address = DWARF2_ADDR_SIZE (stdoutput); |
||
1897 | |||
1898 | /* Create and switch to the line number section. */ |
||
1899 | line_seg = subseg_new (".debug_line", 0); |
||
1900 | bfd_set_section_flags (stdoutput, line_seg, SEC_READONLY | SEC_DEBUGGING); |
||
1901 | |||
1902 | /* For each subsection, chain the debug entries together. */ |
||
1903 | for (s = all_segs; s; s = s->next) |
||
1904 | { |
||
1905 | struct line_subseg *lss = s->head; |
||
1906 | struct line_entry **ptail = lss->ptail; |
||
1907 | |||
1908 | while ((lss = lss->next) != NULL) |
||
1909 | { |
||
1910 | *ptail = lss->head; |
||
1911 | ptail = lss->ptail; |
||
1912 | } |
||
1913 | } |
||
1914 | |||
1915 | out_debug_line (line_seg); |
||
1916 | |||
1917 | /* If this is assembler generated line info, and there is no |
||
1918 | debug_info already, we need .debug_info and .debug_abbrev |
||
1919 | sections as well. */ |
||
1920 | if (emit_other_sections) |
||
1921 | { |
||
1922 | segT abbrev_seg; |
||
1923 | segT aranges_seg; |
||
1924 | segT ranges_seg; |
||
1925 | |||
1926 | gas_assert (all_segs); |
||
1927 | |||
1928 | info_seg = subseg_new (".debug_info", 0); |
||
1929 | abbrev_seg = subseg_new (".debug_abbrev", 0); |
||
1930 | aranges_seg = subseg_new (".debug_aranges", 0); |
||
1931 | |||
1932 | bfd_set_section_flags (stdoutput, info_seg, |
||
1933 | SEC_READONLY | SEC_DEBUGGING); |
||
1934 | bfd_set_section_flags (stdoutput, abbrev_seg, |
||
1935 | SEC_READONLY | SEC_DEBUGGING); |
||
1936 | bfd_set_section_flags (stdoutput, aranges_seg, |
||
1937 | SEC_READONLY | SEC_DEBUGGING); |
||
1938 | |||
1939 | record_alignment (aranges_seg, ffs (2 * sizeof_address) - 1); |
||
1940 | |||
1941 | if (all_segs->next == NULL) |
||
1942 | ranges_seg = NULL; |
||
1943 | else |
||
1944 | { |
||
1945 | ranges_seg = subseg_new (".debug_ranges", 0); |
||
1946 | bfd_set_section_flags (stdoutput, ranges_seg, |
||
1947 | SEC_READONLY | SEC_DEBUGGING); |
||
1948 | record_alignment (ranges_seg, ffs (2 * sizeof_address) - 1); |
||
1949 | out_debug_ranges (ranges_seg); |
||
1950 | } |
||
1951 | |||
1952 | out_debug_aranges (aranges_seg, info_seg); |
||
1953 | out_debug_abbrev (abbrev_seg, info_seg, line_seg); |
||
1954 | out_debug_info (info_seg, abbrev_seg, line_seg, ranges_seg); |
||
1955 | } |
||
1956 | }>>>>>>>>=>=>>=>=>>>>>>>>=> |