1 | #!/usr/bin/env python |
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2 | # -*- coding: utf-8 -*- |
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3 | |
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4 | # Copyright (c) 2016 embedded brains GmbH. All rights reserved. |
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5 | # |
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6 | # embedded brains GmbH |
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7 | # Dornierstr. 4 |
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8 | # 82178 Puchheim |
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9 | # Germany |
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10 | # <rtems@embedded-brains.de> |
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11 | # |
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12 | # Redistribution and use in source and binary forms, with or without |
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13 | # modification, are permitted provided that the following conditions |
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14 | # are met: |
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15 | # 1. Redistributions of source code must retain the above copyright |
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16 | # notice, this list of conditions and the following disclaimer. |
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17 | # 2. Redistributions in binary form must reproduce the above copyright |
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18 | # notice, this list of conditions and the following disclaimer in the |
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19 | # documentation and/or other materials provided with the distribution. |
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20 | # |
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21 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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22 | # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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23 | # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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24 | # ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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25 | # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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26 | # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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27 | # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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28 | # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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29 | # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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30 | # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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31 | # SUCH DAMAGE. |
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32 | |
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33 | from __future__ import print_function, division |
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34 | import argparse |
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35 | import sys |
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36 | from elftools.elf.elffile import ELFFile |
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37 | import re |
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38 | import copy |
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39 | import os |
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40 | |
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41 | VERBOSE_SOME = 1 |
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42 | VERBOSE_MORE = 2 |
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43 | VERBOSE_MOST = 3 |
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44 | |
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45 | class Error(Exception): |
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46 | """Base class for exceptions in this module.""" |
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47 | pass |
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48 | |
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49 | |
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50 | class NoDwarfInfoError(Error): |
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51 | """Exception raised in case there is no DWARF information.""" |
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52 | |
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53 | def __init__(self): |
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54 | super(NoDwarfInfoError, self).__init__("Input file has no DWARF info.") |
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55 | |
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56 | |
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57 | class TypenameNotFoundError(Error): |
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58 | """Exception raised in case a die is not found like expected.""" |
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59 | pass |
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60 | |
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61 | |
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62 | class AnonymousStructureError(Error): |
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63 | """Exception raised in case a die is not found like expected.""" |
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64 | pass |
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65 | |
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66 | |
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67 | class VarnameNotFoundError(Error): |
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68 | """Exception raised in case a die is not found like expected.""" |
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69 | |
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70 | def __init__(self): |
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71 | super(VarnameNotFoundError, self).__init__("Couldn't find the variables name.") |
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72 | |
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73 | |
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74 | class HeaderGenCU: |
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75 | """Process a single CU""" |
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76 | |
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77 | def __init__(self, cu, progname, lineprog, err = sys.stderr, verbose = 0, |
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78 | filterre = re.compile('.*')): |
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79 | self._rtems_port_names = [] |
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80 | self._rtems_port_names.append("_Linker_set_bsd_prog_%s_begin" % progname) |
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81 | self._rtems_port_names.append("_Linker_set_bsd_prog_%s_end" % progname) |
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82 | self._rtems_port_names.append("rtems_bsd_command_%s" % progname) |
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83 | |
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84 | self._err = err |
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85 | self._verbose = verbose |
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86 | self._cu = cu |
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87 | self._progname = progname |
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88 | self._die_by_offset = {} |
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89 | self._lineprogram = lineprog |
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90 | self._filterre = filterre |
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91 | self._namespace_prefix = "_bsd_%s_" % (self._progname) |
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92 | |
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93 | self._fill_die_list() |
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94 | |
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95 | if self._verbose >= VERBOSE_MOST: |
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96 | print('DIE list: \n', self._die_by_offset) |
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97 | |
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98 | def _fill_die_list(self, die = None): |
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99 | if die is None: |
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100 | die = self._cu.get_top_DIE() |
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101 | # Use relative indices for the keys like they are used to reference |
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102 | # inside one cu |
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103 | offset = die.offset - self._cu.cu_offset |
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104 | self._die_by_offset[offset] = die |
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105 | for child in die.iter_children(): |
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106 | self._fill_die_list(child) |
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107 | |
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108 | def _die_is_var(self, die): |
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109 | return (die.tag == "DW_TAG_variable") |
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110 | |
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111 | def _die_is_function(self, die): |
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112 | return (die.tag == "DW_TAG_subprogram") |
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113 | |
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114 | def _get_type(self, die, first_array = True): |
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115 | """Get the type of a variable DIE. |
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116 | Returns two strings: one prefix and one postfix for the variable name""" |
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117 | typepre = "" |
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118 | typepost = "" |
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119 | |
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120 | if self._verbose >= VERBOSE_MOST: |
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121 | self._err.write('Search type for DIE with offset=%d\n' % \ |
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122 | (die.offset)) |
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123 | |
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124 | try: |
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125 | typedie_offset = die.attributes["DW_AT_type"].value |
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126 | except KeyError: |
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127 | raise TypenameNotFoundError('Couldn\'t find the offset of the type DIE\n') |
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128 | |
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129 | try: |
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130 | typedie = self._die_by_offset[typedie_offset] |
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131 | except KeyError: |
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132 | raise TypenameNotFoundError('Couldn\'t find the DIE at offset %d\n' % \ |
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133 | (typedie_offset)) |
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134 | |
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135 | last = False |
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136 | if (typedie.tag == "DW_TAG_const_type"): |
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137 | typepre += "const " |
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138 | |
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139 | elif (typedie.tag == "DW_TAG_array_type"): |
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140 | for child in typedie.iter_children(): |
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141 | if child.tag == "DW_TAG_subrange_type": |
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142 | if first_array == True: |
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143 | arraysize = "" |
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144 | first_array = False |
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145 | else: |
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146 | try: |
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147 | upper_bound = child.attributes["DW_AT_upper_bound"].value |
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148 | arraysize = "%d" % (upper_bound + 1) |
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149 | except KeyError: |
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150 | arraysize = "" |
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151 | typepost += "[%s]" % arraysize |
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152 | |
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153 | elif (typedie.tag == "DW_TAG_volatile_type"): |
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154 | typepre += "volatile " |
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155 | |
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156 | elif (typedie.tag == "DW_TAG_pointer_type"): |
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157 | typepre += "*" |
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158 | |
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159 | elif (typedie.tag == "DW_TAG_structure_type"): |
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160 | typepre += "struct " |
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161 | |
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162 | elif (typedie.tag == "DW_TAG_enumeration_type"): |
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163 | typepre += "enum " |
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164 | |
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165 | elif (typedie.tag == "DW_TAG_subroutine_type"): |
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166 | typepre = "(" |
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167 | typepost = ")(" |
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168 | current_child = 0 |
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169 | for child in typedie.iter_children(): |
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170 | pre, post = self._get_type(child) |
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171 | if (current_child > 0): |
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172 | typepost += ", " |
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173 | typepost += pre + post |
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174 | current_child += 1 |
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175 | if current_child == 0: |
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176 | typepost += "void" |
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177 | typepost += ")" |
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178 | if not "DW_AT_type" in typedie.attributes.keys(): |
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179 | typepre = "void " + typepre |
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180 | last = True |
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181 | |
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182 | elif (typedie.tag == "DW_TAG_typedef") or \ |
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183 | (typedie.tag == "DW_TAG_base_type"): |
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184 | # nothing to do here than prevent the error |
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185 | pass |
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186 | |
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187 | else: |
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188 | raise TypenameNotFoundError('Unknown tag: %s\n' % (typedie.tag)) |
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189 | |
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190 | if (typedie.tag == "DW_TAG_typedef") or \ |
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191 | (typedie.tag == "DW_TAG_base_type") or \ |
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192 | (typedie.tag == "DW_TAG_structure_type") or \ |
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193 | (typedie.tag == "DW_TAG_enumeration_type"): |
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194 | last = True |
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195 | try: |
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196 | typepre += "%s " % \ |
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197 | typedie.attributes["DW_AT_name"].value.decode('ascii') |
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198 | except KeyError: |
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199 | if typedie.has_children: |
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200 | message = 'Found an anonymous structure' |
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201 | raise AnonymousStructureError(message) |
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202 | else: |
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203 | message = 'Couldn\'t get type name from DIE' |
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204 | raise TypenameNotFoundError(message) |
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205 | |
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206 | if last == False: |
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207 | addpre, addpost = self._get_type(typedie, first_array) |
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208 | typepre = addpre + typepre |
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209 | typepost = typepost + addpost |
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210 | |
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211 | if self._verbose >= VERBOSE_MOST: |
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212 | self._err.write('Add prefix="%s", postfix="%s" for DIE with offset=%d\n' % \ |
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213 | (typepre, typepost, die.offset)) |
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214 | |
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215 | return typepre, typepost |
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216 | |
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217 | def generate_header(self, data_out_filename, glob_data_out, namesp_out): |
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218 | """Find all top level (global) variables in the ELF file and generate |
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219 | output that can be written in a header. |
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220 | """ |
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221 | |
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222 | top_die = self._cu.get_top_DIE() |
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223 | try: |
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224 | filename = top_die.attributes["DW_AT_name"].value.decode('ascii') |
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225 | except KeyError: |
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226 | filename = top_die.get_full_path() |
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227 | self._err.write("WARNING: getting the filename failed. Use fallback.") |
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228 | |
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229 | basename = os.path.basename(filename) |
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230 | modulename = os.path.splitext(basename)[0] |
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231 | my_data_out_filename = data_out_filename.replace("#MODULE#", modulename) |
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232 | my_data_out = open(my_data_out_filename, "w") |
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233 | |
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234 | glob_data_out.write("/* %s */\n" % (basename)) |
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235 | |
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236 | namesp_out.write("/* %s */\n" % (basename)) |
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237 | |
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238 | my_data_out.write("/* generated by userspace-header-gen.py */\n") |
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239 | my_data_out.write("#include <rtems/linkersets.h>\n") |
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240 | my_data_out.write('#include "%s"\n' % (glob_data_out.name)) |
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241 | my_data_out.write("/* %s */\n" % (basename)) |
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242 | |
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243 | self._process_die(top_die, my_data_out, glob_data_out, namesp_out) |
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244 | |
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245 | def _is_constant(self, die): |
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246 | is_constant = False |
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247 | try: |
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248 | type_offset = die.attributes["DW_AT_type"].value |
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249 | typedie = self._die_by_offset[type_offset] |
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250 | except KeyError: |
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251 | self._err.write("WARNING: Could not find out whether DIE %d is const.\n" % \ |
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252 | die.offset) |
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253 | pass |
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254 | else: |
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255 | if typedie.tag == "DW_TAG_const_type": |
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256 | is_constant = True |
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257 | return is_constant |
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258 | |
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259 | def _process_die(self, die, data_out, glob_data_out, namesp_out): |
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260 | for child in die.iter_children(): |
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261 | specdie = child |
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262 | # get the name of the DIE |
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263 | try: |
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264 | varname = child.attributes["DW_AT_name"].value.decode('ascii') |
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265 | except KeyError: |
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266 | # this might is an external variable with a specification |
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267 | # located elsewhere |
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268 | try: |
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269 | specification = child.attributes["DW_AT_specification"]\ |
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270 | .value |
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271 | specdie = self._die_by_offset[specification] |
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272 | varname = specdie.attributes["DW_AT_name"].value\ |
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273 | .decode('ascii') |
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274 | except KeyError: |
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275 | varname = None |
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276 | |
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277 | # filter all none variable or function DIEs |
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278 | is_function = False |
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279 | if self._die_is_var(child): |
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280 | if self._verbose >= VERBOSE_MORE: |
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281 | self._err.write('Process variable DIE: tag=%s, name=%s\n' % \ |
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282 | (child.tag, varname)) |
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283 | elif self._die_is_function(child): |
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284 | if self._verbose >= VERBOSE_MORE: |
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285 | self._err.write('Process function DIE: tag=%s, name=%s\n' % \ |
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286 | (child.tag, varname)) |
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287 | if varname is None: |
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288 | if self._verbose >= VERBOSE_MORE: |
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289 | self._err.write('Skip function with no name.\n') |
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290 | continue |
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291 | is_function = True |
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292 | else: |
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293 | if self._verbose >= VERBOSE_MORE: |
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294 | self._err.write('DIE is no variable or function: tag=%s, name=%s\n' % \ |
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295 | (child.tag, varname)) |
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296 | # FIXME: Check if this die has children and if one of the |
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297 | # children is a function static variable |
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298 | continue |
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299 | |
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300 | # filter some special names that are used for porting |
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301 | if varname in self._rtems_port_names: |
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302 | self._err.write('Skip %s. It is a special object for porting.\n' % \ |
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303 | (varname)) |
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304 | continue |
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305 | |
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306 | # check if it is an external variable |
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307 | is_extern = False |
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308 | try: |
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309 | is_extern = (specdie.attributes["DW_AT_external"].value != 0) |
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310 | except KeyError: |
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311 | # if the key is not there it is not extern |
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312 | is_extern = False |
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313 | |
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314 | # check if it is an declaration |
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315 | is_decl = False |
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316 | try: |
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317 | is_decl = (specdie.attributes["DW_AT_declaration"].value != 0) |
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318 | except KeyError: |
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319 | # if the key is not there it is not an declaration |
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320 | is_decl = False |
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321 | |
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322 | # filter declaration only lines (we only want the definitions) |
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323 | if is_decl and specdie == child: |
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324 | if self._verbose >= VERBOSE_MORE: |
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325 | self._err.write('Skip extern variable "%s" because it is only a declaration.\n' % \ |
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326 | (varname)) |
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327 | continue |
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328 | |
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329 | # filter constants |
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330 | if (not is_function) and self._is_constant(specdie): |
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331 | if self._verbose >= VERBOSE_SOME: |
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332 | self._err.write('Skip const variable "%s" because it is a const.\n' % (varname)) |
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333 | continue |
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334 | |
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335 | # Check if we haven't found a name earlier |
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336 | if varname is None: |
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337 | raise VarnameNotFoundError |
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338 | |
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339 | # Fixup name (necessary if the script runs a second time) |
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340 | varname = varname.replace(self._namespace_prefix, "") |
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341 | |
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342 | # get file and line |
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343 | try: |
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344 | decl_file_idx = child.attributes["DW_AT_decl_file"].value - 1 |
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345 | decl_file = self._lineprogram['file_entry'][decl_file_idx].name.decode('ascii') |
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346 | except KeyError: |
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347 | decl_file = "<unknown>" |
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348 | try: |
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349 | decl_line = child.attributes["DW_AT_decl_line"].value |
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350 | except KeyError: |
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351 | decl_line = "<unknown>" |
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352 | var_decl = "%s:%s" % (decl_file, decl_line) |
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353 | |
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354 | if self._filterre.match(decl_file) is None: |
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355 | if self._verbose >= VERBOSE_SOME: |
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356 | self._err.write('Skip variable "%s" because it\'s declaration file (%s) doesn\'t match the filter\n' % \ |
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357 | (varname, var_decl)) |
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358 | continue |
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359 | |
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360 | # get type for the variable |
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361 | if not is_function: |
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362 | try: |
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363 | typepre, typepost = self._get_type(specdie) |
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364 | except TypenameNotFoundError: |
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365 | self._err.write('Couldn\'t find type for "%s" at %s\n' % |
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366 | (varname, var_decl)) |
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367 | raise |
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368 | except AnonymousStructureError: |
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369 | self._err.write('ERROR: anonymous structure "%s" at %s\n' % \ |
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370 | (varname, var_decl)) |
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371 | raise |
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372 | var_with_type = "%s%s%s" % (typepre, varname, typepost) |
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373 | |
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374 | # check if it is a static or a extern |
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375 | if not is_extern: |
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376 | var_with_type = "static " + var_with_type |
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377 | outfile = data_out |
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378 | else: |
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379 | self._err.write('WARNING: variable is not static: "%s" at %s\n' % \ |
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380 | (var_with_type, var_decl)) |
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381 | var_with_type = "extern " + var_with_type |
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382 | outfile = glob_data_out |
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383 | |
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384 | # write output |
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385 | if self._verbose >= VERBOSE_SOME: |
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386 | if not is_function: |
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387 | self._err.write('Found a variable "%s" at %s (DIE offset %s); extern: %r\n' % \ |
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388 | (var_with_type, var_decl, child.offset, is_extern)) |
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389 | else: |
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390 | self._err.write('Found a function "%s" at %s (DIE offset %s); extern: %r\n' % \ |
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391 | (varname, var_decl, child.offset, is_extern)) |
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392 | if not is_function: |
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393 | outfile.write("RTEMS_LINKER_RWSET_CONTENT(bsd_prog_%s, %s);\n" % \ |
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394 | (self._progname, var_with_type)) |
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395 | if is_extern: |
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396 | namesp_out.write("#define %s %s%s\n" % \ |
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397 | (varname, self._namespace_prefix, varname)) |
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398 | |
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399 | |
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400 | class UserspaceHeaderGen: |
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401 | def __init__(self, objfiles, progname, err = sys.stderr, verbose = 0, |
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402 | filterre = re.compile(".*")): |
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403 | self._err = err |
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404 | self._verbose = verbose |
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405 | self._objfiles = objfiles |
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406 | self._progname = progname |
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407 | self._filterre = filterre |
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408 | |
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409 | def generate_header(self, data_out_filename, glob_data_out, namesp_out): |
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410 | """Find all top level (global) variables in the ELF file and generate |
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411 | a header. |
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412 | """ |
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413 | glob_data_out.write("/* generated by userspace-header-gen.py */\n") |
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414 | glob_data_out.write("#include <rtems/linkersets.h>\n") |
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415 | |
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416 | namesp_out.write("/* generated by userspace-header-gen.py */\n") |
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417 | |
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418 | for objfile in self._objfiles: |
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419 | elffile = ELFFile(objfile) |
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420 | if not elffile.has_dwarf_info(): |
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421 | raise NoDwarfInfoError() |
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422 | |
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423 | # Don't relocate DWARF sections. This is not necessary for us but |
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424 | # makes problems on ARM with current pyelftools (version 0.24) |
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425 | dwarfinfo = elffile.get_dwarf_info(relocate_dwarf_sections=False) |
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426 | |
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427 | for cu in dwarfinfo.iter_CUs(): |
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428 | if self._verbose >= VERBOSE_SOME: |
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429 | self._err.write('Found a CU at offset %s, length %s\n' % \ |
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430 | (cu.cu_offset, cu['unit_length'])) |
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431 | |
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432 | lineprog = dwarfinfo.line_program_for_CU(cu) |
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433 | headergen = HeaderGenCU(cu, self._progname, lineprog, self._err, |
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434 | self._verbose, self._filterre); |
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435 | headergen.generate_header(data_out_filename, glob_data_out, |
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436 | namesp_out); |
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437 | |
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438 | |
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439 | if __name__ == '__main__': |
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440 | default_filter = '.*' |
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441 | default_dataout = 'rtems-bsd-#PROGNAME#-#MODULE#-data.h' |
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442 | default_globdataout = 'rtems-bsd-#PROGNAME#-data.h' |
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443 | default_namespaceout = 'rtems-bsd-#PROGNAME#-namespace.h' |
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444 | parser = argparse.ArgumentParser( |
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445 | description=( |
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446 | "Generate header files for porting FreeBSD user space tools to RTEMS." |
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447 | "Takes an object file as input." |
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448 | )) |
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449 | parser.add_argument( |
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450 | "objfile", |
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451 | help="Text arguments. One or more can be appended to the call.", |
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452 | type=argparse.FileType("rb"), |
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453 | nargs='+' |
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454 | ) |
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455 | parser.add_argument( |
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456 | "-f", "--filter", |
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457 | help="Only process variables that are defined in files with a name " \ |
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458 | "matching the given regular expression. " \ |
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459 | "Default: '%s'" % default_filter, |
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460 | dest="filter_string", |
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461 | default=default_filter |
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462 | ) |
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463 | parser.add_argument( |
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464 | "-p", "--progname", |
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465 | help="Name of the program. Default: MYPROG", |
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466 | default="MYPROG" |
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467 | ) |
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468 | parser.add_argument( |
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469 | "-d", "--dataout", |
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470 | help="Name of the output files where the section attributes will be " \ |
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471 | "added. '#PROGNAME#' will be replaced by the program name " \ |
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472 | "(set by parameter -p). '#MODULE#' will be replaced by the " |
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473 | "current c modules base name. " \ |
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474 | "Default: '%s'" % (default_dataout), |
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475 | default=default_dataout, |
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476 | nargs="?" |
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477 | ) |
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478 | parser.add_argument( |
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479 | "-g", "--globdataout", |
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480 | help="Name of the output files where the section attributes for " \ |
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481 | "global variables will be added. " \ |
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482 | "Default: '%s'" % (default_globdataout), |
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483 | default=default_globdataout, |
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484 | nargs="?" |
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485 | ) |
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486 | parser.add_argument( |
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487 | "-n", "--namespaceout", |
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488 | help="Name of the output file where namespace definitions will be " \ |
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489 | "added. Default: '%s'" % (default_namespaceout), |
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490 | default=default_namespaceout, |
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491 | nargs="?" |
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492 | ) |
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493 | parser.add_argument( |
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494 | "-v", "--verbose", |
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495 | help="Be more verbose. Can be used multiple times.", |
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496 | default=0, |
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497 | action="count" |
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498 | ) |
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499 | args = parser.parse_args() |
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500 | |
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501 | filterre = re.compile(args.filter_string) |
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502 | |
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503 | globdataoutfilename = args.globdataout.replace("#PROGNAME#", args.progname) |
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504 | globdataoutfile = open(globdataoutfilename, 'w') |
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505 | |
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506 | namespaceoutfilename = args.namespaceout.replace("#PROGNAME#", args.progname) |
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507 | namespaceoutfile = open(namespaceoutfilename, 'w') |
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508 | |
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509 | dataoutfilename = args.dataout.replace("#PROGNAME#", args.progname) |
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510 | |
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511 | uhg = UserspaceHeaderGen(objfiles = args.objfile, |
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512 | verbose = args.verbose, |
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513 | progname = args.progname, |
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514 | filterre = filterre) |
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515 | uhg.generate_header(dataoutfilename, globdataoutfile, namespaceoutfile) |
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516 | |
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517 | # vim: set ts=4 sw=4 et: |
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