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111
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1 # Python hooks for gdb for debugging GCC
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131
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2 # Copyright (C) 2013-2018 Free Software Foundation, Inc.
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111
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3
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4 # Contributed by David Malcolm <dmalcolm@redhat.com>
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5
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6 # This file is part of GCC.
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7
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8 # GCC is free software; you can redistribute it and/or modify it under
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9 # the terms of the GNU General Public License as published by the Free
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10 # Software Foundation; either version 3, or (at your option) any later
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11 # version.
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12
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13 # GCC is distributed in the hope that it will be useful, but WITHOUT
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14 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 # for more details.
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17
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18 # You should have received a copy of the GNU General Public License
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19 # along with GCC; see the file COPYING3. If not see
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20 # <http://www.gnu.org/licenses/>.
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21
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22 """
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23 Enabling the debugging hooks
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24 ----------------------------
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25 gcc/configure (from configure.ac) generates a .gdbinit within the "gcc"
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26 subdirectory of the build directory, and when run by gdb, this imports
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27 gcc/gdbhooks.py from the source directory, injecting useful Python code
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28 into gdb.
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29
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30 You may see a message from gdb of the form:
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31 "path-to-build/gcc/.gdbinit" auto-loading has been declined by your `auto-load safe-path'
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32 as a protection against untrustworthy python scripts. See
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33 http://sourceware.org/gdb/onlinedocs/gdb/Auto_002dloading-safe-path.html
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34
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35 The fix is to mark the paths of the build/gcc directory as trustworthy.
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36 An easy way to do so is by adding the following to your ~/.gdbinit script:
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37 add-auto-load-safe-path /absolute/path/to/build/gcc
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38 for the build directories for your various checkouts of gcc.
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39
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40 If it's working, you should see the message:
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41 Successfully loaded GDB hooks for GCC
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42 as gdb starts up.
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43
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44 During development, I've been manually invoking the code in this way, as a
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45 precanned way of printing a variety of different kinds of value:
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46
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47 gdb \
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48 -ex "break expand_gimple_stmt" \
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49 -ex "run" \
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50 -ex "bt" \
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51 --args \
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52 ./cc1 foo.c -O3
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53
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54 Examples of output using the pretty-printers
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55 --------------------------------------------
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56 Pointer values are generally shown in the form:
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57 <type address extra_info>
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58
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59 For example, an opt_pass* might appear as:
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60 (gdb) p pass
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61 $2 = <opt_pass* 0x188b600 "expand"(170)>
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62
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63 The name of the pass is given ("expand"), together with the
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64 static_pass_number.
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65
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66 Note that you can dereference the pointer in the normal way:
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67 (gdb) p *pass
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68 $4 = {type = RTL_PASS, name = 0x120a312 "expand",
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69 [etc, ...snipped...]
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70
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71 and you can suppress pretty-printers using /r (for "raw"):
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72 (gdb) p /r pass
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73 $3 = (opt_pass *) 0x188b600
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74
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75 Basic blocks are shown with their index in parentheses, apart from the
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76 CFG's entry and exit blocks, which are given as "ENTRY" and "EXIT":
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77 (gdb) p bb
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78 $9 = <basic_block 0x7ffff041f1a0 (2)>
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79 (gdb) p cfun->cfg->x_entry_block_ptr
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80 $10 = <basic_block 0x7ffff041f0d0 (ENTRY)>
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81 (gdb) p cfun->cfg->x_exit_block_ptr
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82 $11 = <basic_block 0x7ffff041f138 (EXIT)>
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83
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84 CFG edges are shown with the src and dest blocks given in parentheses:
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85 (gdb) p e
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86 $1 = <edge 0x7ffff043f118 (ENTRY -> 6)>
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87
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88 Tree nodes are printed using Python code that emulates print_node_brief,
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89 running in gdb, rather than in the inferior:
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90 (gdb) p cfun->decl
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91 $1 = <function_decl 0x7ffff0420b00 foo>
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92 For usability, the type is printed first (e.g. "function_decl"), rather
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93 than just "tree".
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94
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95 RTL expressions use a kludge: they are pretty-printed by injecting
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96 calls into print-rtl.c into the inferior:
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97 Value returned is $1 = (note 9 8 10 [bb 3] NOTE_INSN_BASIC_BLOCK)
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98 (gdb) p $1
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99 $2 = (note 9 8 10 [bb 3] NOTE_INSN_BASIC_BLOCK)
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100 (gdb) p /r $1
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101 $3 = (rtx_def *) 0x7ffff043e140
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102 This won't work for coredumps, and probably in other circumstances, but
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103 it's a quick way of getting lots of debuggability quickly.
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104
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105 Callgraph nodes are printed with the name of the function decl, if
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106 available:
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107 (gdb) frame 5
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131
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108 #5 0x00000000006c288a in expand_function (node=<cgraph_node* 0x7ffff0312720 "foo"/12345>) at ../../src/gcc/cgraphunit.c:1594
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111
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109 1594 execute_pass_list (g->get_passes ()->all_passes);
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110 (gdb) p node
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131
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111 $1 = <cgraph_node* 0x7ffff0312720 "foo"/12345>
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112
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113 Similarly for symtab_node and varpool_node classes.
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114
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115 Cgraph edges are printed with the name of caller and callee:
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116 (gdb) p this->callees
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117 $4 = <cgraph_edge* 0x7fffe25aa000 (<cgraph_node * 0x7fffe62b22e0 "_GLOBAL__sub_I__ZN5Pooma5pinfoE"/19660> -> <cgraph_node * 0x7fffe620f730 "__static_initialization_and_destruction_1"/19575>)>
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118
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119 IPA reference follow very similar format:
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120 (gdb) Value returned is $5 = <ipa_ref* 0x7fffefcb80c8 (<symtab_node * 0x7ffff562f000 "__dt_base "/875> -> <symtab_node * 0x7fffe795f000 "_ZTVN6Smarts8RunnableE"/16056>:IPA_REF_ADDR)>
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111
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121
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122 vec<> pointers are printed as the address followed by the elements in
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123 braces. Here's a length 2 vec:
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124 (gdb) p bb->preds
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125 $18 = 0x7ffff0428b68 = {<edge 0x7ffff044d380 (3 -> 5)>, <edge 0x7ffff044d3b8 (4 -> 5)>}
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126
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127 and here's a length 1 vec:
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128 (gdb) p bb->succs
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129 $19 = 0x7ffff0428bb8 = {<edge 0x7ffff044d3f0 (5 -> EXIT)>}
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130
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131 You cannot yet use array notation [] to access the elements within the
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132 vector: attempting to do so instead gives you the vec itself (for vec[0]),
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133 or a (probably) invalid cast to vec<> for the memory after the vec (for
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134 vec[1] onwards).
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135
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136 Instead (for now) you must access m_vecdata:
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137 (gdb) p bb->preds->m_vecdata[0]
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138 $20 = <edge 0x7ffff044d380 (3 -> 5)>
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139 (gdb) p bb->preds->m_vecdata[1]
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140 $21 = <edge 0x7ffff044d3b8 (4 -> 5)>
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141 """
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142 import os.path
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143 import re
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144 import sys
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145 import tempfile
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146
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147 import gdb
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148 import gdb.printing
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149 import gdb.types
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150
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151 # Convert "enum tree_code" (tree.def and tree.h) to a dict:
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152 tree_code_dict = gdb.types.make_enum_dict(gdb.lookup_type('enum tree_code'))
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153
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154 # ...and look up specific values for use later:
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155 IDENTIFIER_NODE = tree_code_dict['IDENTIFIER_NODE']
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156 TYPE_DECL = tree_code_dict['TYPE_DECL']
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157
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158 # Similarly for "enum tree_code_class" (tree.h):
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159 tree_code_class_dict = gdb.types.make_enum_dict(gdb.lookup_type('enum tree_code_class'))
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160 tcc_type = tree_code_class_dict['tcc_type']
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161 tcc_declaration = tree_code_class_dict['tcc_declaration']
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162
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163 # Python3 has int() with arbitrary precision (bignum). Python2 int() is 32-bit
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164 # on 32-bit hosts but remote targets may have 64-bit pointers there; Python2
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165 # long() is always 64-bit but Python3 no longer has anything named long.
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166 def intptr(gdbval):
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167 return long(gdbval) if sys.version_info.major == 2 else int(gdbval)
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168
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169 class Tree:
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170 """
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171 Wrapper around a gdb.Value for a tree, with various methods
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172 corresponding to macros in gcc/tree.h
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173 """
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174 def __init__(self, gdbval):
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175 self.gdbval = gdbval
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176
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177 def is_nonnull(self):
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178 return intptr(self.gdbval)
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179
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180 def TREE_CODE(self):
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181 """
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182 Get gdb.Value corresponding to TREE_CODE (self)
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183 as per:
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184 #define TREE_CODE(NODE) ((enum tree_code) (NODE)->base.code)
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185 """
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186 return self.gdbval['base']['code']
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187
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188 def DECL_NAME(self):
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189 """
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190 Get Tree instance corresponding to DECL_NAME (self)
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191 """
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192 return Tree(self.gdbval['decl_minimal']['name'])
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193
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194 def TYPE_NAME(self):
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195 """
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196 Get Tree instance corresponding to result of TYPE_NAME (self)
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197 """
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198 return Tree(self.gdbval['type_common']['name'])
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199
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200 def IDENTIFIER_POINTER(self):
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201 """
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202 Get str correspoinding to result of IDENTIFIER_NODE (self)
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203 """
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204 return self.gdbval['identifier']['id']['str'].string()
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205
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206 class TreePrinter:
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207 "Prints a tree"
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208
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209 def __init__ (self, gdbval):
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210 self.gdbval = gdbval
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211 self.node = Tree(gdbval)
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212
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213 def to_string (self):
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214 # like gcc/print-tree.c:print_node_brief
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215 # #define TREE_CODE(NODE) ((enum tree_code) (NODE)->base.code)
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216 # tree_code_name[(int) TREE_CODE (node)])
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217 if intptr(self.gdbval) == 0:
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218 return '<tree 0x0>'
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219
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220 val_TREE_CODE = self.node.TREE_CODE()
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221
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222 # extern const enum tree_code_class tree_code_type[];
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223 # #define TREE_CODE_CLASS(CODE) tree_code_type[(int) (CODE)]
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224
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225 val_tree_code_type = gdb.parse_and_eval('tree_code_type')
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226 val_tclass = val_tree_code_type[val_TREE_CODE]
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227
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228 val_tree_code_name = gdb.parse_and_eval('tree_code_name')
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229 val_code_name = val_tree_code_name[intptr(val_TREE_CODE)]
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230 #print(val_code_name.string())
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231
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232 result = '<%s 0x%x' % (val_code_name.string(), intptr(self.gdbval))
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233 if intptr(val_tclass) == tcc_declaration:
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234 tree_DECL_NAME = self.node.DECL_NAME()
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235 if tree_DECL_NAME.is_nonnull():
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236 result += ' %s' % tree_DECL_NAME.IDENTIFIER_POINTER()
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237 else:
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238 pass # TODO: labels etc
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239 elif intptr(val_tclass) == tcc_type:
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240 tree_TYPE_NAME = Tree(self.gdbval['type_common']['name'])
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241 if tree_TYPE_NAME.is_nonnull():
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242 if tree_TYPE_NAME.TREE_CODE() == IDENTIFIER_NODE:
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243 result += ' %s' % tree_TYPE_NAME.IDENTIFIER_POINTER()
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244 elif tree_TYPE_NAME.TREE_CODE() == TYPE_DECL:
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245 if tree_TYPE_NAME.DECL_NAME().is_nonnull():
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246 result += ' %s' % tree_TYPE_NAME.DECL_NAME().IDENTIFIER_POINTER()
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247 if self.node.TREE_CODE() == IDENTIFIER_NODE:
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248 result += ' %s' % self.node.IDENTIFIER_POINTER()
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249 # etc
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250 result += '>'
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251 return result
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252
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253 ######################################################################
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254 # Callgraph pretty-printers
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255 ######################################################################
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256
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131
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257 class SymtabNodePrinter:
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111
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258 def __init__(self, gdbval):
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259 self.gdbval = gdbval
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260
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261 def to_string (self):
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131
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262 t = str(self.gdbval.type)
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263 result = '<%s 0x%x' % (t, intptr(self.gdbval))
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111
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264 if intptr(self.gdbval):
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265 # symtab_node::name calls lang_hooks.decl_printable_name
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266 # default implementation (lhd_decl_printable_name) is:
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267 # return IDENTIFIER_POINTER (DECL_NAME (decl));
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268 tree_decl = Tree(self.gdbval['decl'])
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131
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269 result += ' "%s"/%d' % (tree_decl.DECL_NAME().IDENTIFIER_POINTER(), self.gdbval['order'])
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270 result += '>'
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271 return result
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272
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273 class CgraphEdgePrinter:
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274 def __init__(self, gdbval):
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275 self.gdbval = gdbval
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276
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277 def to_string (self):
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278 result = '<cgraph_edge* 0x%x' % intptr(self.gdbval)
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279 if intptr(self.gdbval):
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280 src = SymtabNodePrinter(self.gdbval['caller']).to_string()
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281 dest = SymtabNodePrinter(self.gdbval['callee']).to_string()
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282 result += ' (%s -> %s)' % (src, dest)
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283 result += '>'
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284 return result
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285
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286 class IpaReferencePrinter:
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287 def __init__(self, gdbval):
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288 self.gdbval = gdbval
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289
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290 def to_string (self):
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291 result = '<ipa_ref* 0x%x' % intptr(self.gdbval)
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292 if intptr(self.gdbval):
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293 src = SymtabNodePrinter(self.gdbval['referring']).to_string()
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294 dest = SymtabNodePrinter(self.gdbval['referred']).to_string()
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295 result += ' (%s -> %s:%s)' % (src, dest, str(self.gdbval['use']))
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111
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296 result += '>'
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297 return result
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298
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299 ######################################################################
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300 # Dwarf DIE pretty-printers
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301 ######################################################################
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302
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303 class DWDieRefPrinter:
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304 def __init__(self, gdbval):
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305 self.gdbval = gdbval
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306
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307 def to_string (self):
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308 if intptr(self.gdbval) == 0:
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309 return '<dw_die_ref 0x0>'
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310 result = '<dw_die_ref 0x%x' % intptr(self.gdbval)
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311 result += ' %s' % self.gdbval['die_tag']
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312 if intptr(self.gdbval['die_parent']) != 0:
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313 result += ' <parent=0x%x %s>' % (intptr(self.gdbval['die_parent']),
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314 self.gdbval['die_parent']['die_tag'])
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315
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316 result += '>'
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317 return result
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318
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319 ######################################################################
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320
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321 class GimplePrinter:
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322 def __init__(self, gdbval):
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323 self.gdbval = gdbval
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324
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325 def to_string (self):
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326 if intptr(self.gdbval) == 0:
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327 return '<gimple 0x0>'
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328 val_gimple_code = self.gdbval['code']
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329 val_gimple_code_name = gdb.parse_and_eval('gimple_code_name')
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330 val_code_name = val_gimple_code_name[intptr(val_gimple_code)]
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331 result = '<%s 0x%x' % (val_code_name.string(),
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332 intptr(self.gdbval))
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333 result += '>'
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334 return result
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335
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336 ######################################################################
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337 # CFG pretty-printers
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338 ######################################################################
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339
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340 def bb_index_to_str(index):
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341 if index == 0:
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342 return 'ENTRY'
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343 elif index == 1:
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344 return 'EXIT'
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345 else:
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346 return '%i' % index
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347
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348 class BasicBlockPrinter:
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349 def __init__(self, gdbval):
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350 self.gdbval = gdbval
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351
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352 def to_string (self):
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353 result = '<basic_block 0x%x' % intptr(self.gdbval)
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354 if intptr(self.gdbval):
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355 result += ' (%s)' % bb_index_to_str(intptr(self.gdbval['index']))
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356 result += '>'
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357 return result
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358
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359 class CfgEdgePrinter:
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360 def __init__(self, gdbval):
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361 self.gdbval = gdbval
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362
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363 def to_string (self):
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364 result = '<edge 0x%x' % intptr(self.gdbval)
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365 if intptr(self.gdbval):
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366 src = bb_index_to_str(intptr(self.gdbval['src']['index']))
|
|
|
367 dest = bb_index_to_str(intptr(self.gdbval['dest']['index']))
|
|
|
368 result += ' (%s -> %s)' % (src, dest)
|
|
|
369 result += '>'
|
|
|
370 return result
|
|
|
371
|
|
|
372 ######################################################################
|
|
|
373
|
|
|
374 class Rtx:
|
|
|
375 def __init__(self, gdbval):
|
|
|
376 self.gdbval = gdbval
|
|
|
377
|
|
|
378 def GET_CODE(self):
|
|
|
379 return self.gdbval['code']
|
|
|
380
|
|
|
381 def GET_RTX_LENGTH(code):
|
|
|
382 val_rtx_length = gdb.parse_and_eval('rtx_length')
|
|
|
383 return intptr(val_rtx_length[code])
|
|
|
384
|
|
|
385 def GET_RTX_NAME(code):
|
|
|
386 val_rtx_name = gdb.parse_and_eval('rtx_name')
|
|
|
387 return val_rtx_name[code].string()
|
|
|
388
|
|
|
389 def GET_RTX_FORMAT(code):
|
|
|
390 val_rtx_format = gdb.parse_and_eval('rtx_format')
|
|
|
391 return val_rtx_format[code].string()
|
|
|
392
|
|
|
393 class RtxPrinter:
|
|
|
394 def __init__(self, gdbval):
|
|
|
395 self.gdbval = gdbval
|
|
|
396 self.rtx = Rtx(gdbval)
|
|
|
397
|
|
|
398 def to_string (self):
|
|
|
399 """
|
|
|
400 For now, a cheap kludge: invoke the inferior's print
|
|
|
401 function to get a string to use the user, and return an empty
|
|
|
402 string for gdb
|
|
|
403 """
|
|
|
404 # We use print_inline_rtx to avoid a trailing newline
|
|
|
405 gdb.execute('call print_inline_rtx (stderr, (const_rtx) %s, 0)'
|
|
|
406 % intptr(self.gdbval))
|
|
|
407 return ''
|
|
|
408
|
|
|
409 # or by hand; based on gcc/print-rtl.c:print_rtx
|
|
|
410 result = ('<rtx_def 0x%x'
|
|
|
411 % (intptr(self.gdbval)))
|
|
|
412 code = self.rtx.GET_CODE()
|
|
|
413 result += ' (%s' % GET_RTX_NAME(code)
|
|
|
414 format_ = GET_RTX_FORMAT(code)
|
|
|
415 for i in range(GET_RTX_LENGTH(code)):
|
|
|
416 print(format_[i])
|
|
|
417 result += ')>'
|
|
|
418 return result
|
|
|
419
|
|
|
420 ######################################################################
|
|
|
421
|
|
|
422 class PassPrinter:
|
|
|
423 def __init__(self, gdbval):
|
|
|
424 self.gdbval = gdbval
|
|
|
425
|
|
|
426 def to_string (self):
|
|
|
427 result = '<opt_pass* 0x%x' % intptr(self.gdbval)
|
|
|
428 if intptr(self.gdbval):
|
|
|
429 result += (' "%s"(%i)'
|
|
|
430 % (self.gdbval['name'].string(),
|
|
|
431 intptr(self.gdbval['static_pass_number'])))
|
|
|
432 result += '>'
|
|
|
433 return result
|
|
|
434
|
|
|
435 ######################################################################
|
|
|
436
|
|
|
437 class VecPrinter:
|
|
|
438 # -ex "up" -ex "p bb->preds"
|
|
|
439 def __init__(self, gdbval):
|
|
|
440 self.gdbval = gdbval
|
|
|
441
|
|
|
442 def display_hint (self):
|
|
|
443 return 'array'
|
|
|
444
|
|
|
445 def to_string (self):
|
|
|
446 # A trivial implementation; prettyprinting the contents is done
|
|
|
447 # by gdb calling the "children" method below.
|
|
|
448 return '0x%x' % intptr(self.gdbval)
|
|
|
449
|
|
|
450 def children (self):
|
|
|
451 if intptr(self.gdbval) == 0:
|
|
|
452 return
|
|
|
453 m_vecpfx = self.gdbval['m_vecpfx']
|
|
|
454 m_num = m_vecpfx['m_num']
|
|
|
455 m_vecdata = self.gdbval['m_vecdata']
|
|
|
456 for i in range(m_num):
|
|
|
457 yield ('[%d]' % i, m_vecdata[i])
|
|
|
458
|
|
|
459 ######################################################################
|
|
|
460
|
|
|
461 class MachineModePrinter:
|
|
|
462 def __init__(self, gdbval):
|
|
|
463 self.gdbval = gdbval
|
|
|
464
|
|
|
465 def to_string (self):
|
|
|
466 name = str(self.gdbval['m_mode'])
|
|
|
467 return name[2:] if name.startswith('E_') else name
|
|
|
468
|
|
|
469 ######################################################################
|
|
|
470
|
|
|
471 class OptMachineModePrinter:
|
|
|
472 def __init__(self, gdbval):
|
|
|
473 self.gdbval = gdbval
|
|
|
474
|
|
|
475 def to_string (self):
|
|
|
476 name = str(self.gdbval['m_mode'])
|
|
|
477 if name == 'E_VOIDmode':
|
|
|
478 return '<None>'
|
|
|
479 return name[2:] if name.startswith('E_') else name
|
|
|
480
|
|
|
481 ######################################################################
|
|
|
482
|
|
|
483 # TODO:
|
|
|
484 # * hashtab
|
|
|
485 # * location_t
|
|
|
486
|
|
|
487 class GdbSubprinter(gdb.printing.SubPrettyPrinter):
|
|
|
488 def __init__(self, name, class_):
|
|
|
489 super(GdbSubprinter, self).__init__(name)
|
|
|
490 self.class_ = class_
|
|
|
491
|
|
|
492 def handles_type(self, str_type):
|
|
|
493 raise NotImplementedError
|
|
|
494
|
|
|
495 class GdbSubprinterTypeList(GdbSubprinter):
|
|
|
496 """
|
|
|
497 A GdbSubprinter that handles a specific set of types
|
|
|
498 """
|
|
|
499 def __init__(self, str_types, name, class_):
|
|
|
500 super(GdbSubprinterTypeList, self).__init__(name, class_)
|
|
|
501 self.str_types = frozenset(str_types)
|
|
|
502
|
|
|
503 def handles_type(self, str_type):
|
|
|
504 return str_type in self.str_types
|
|
|
505
|
|
|
506 class GdbSubprinterRegex(GdbSubprinter):
|
|
|
507 """
|
|
|
508 A GdbSubprinter that handles types that match a regex
|
|
|
509 """
|
|
|
510 def __init__(self, regex, name, class_):
|
|
|
511 super(GdbSubprinterRegex, self).__init__(name, class_)
|
|
|
512 self.regex = re.compile(regex)
|
|
|
513
|
|
|
514 def handles_type(self, str_type):
|
|
|
515 return self.regex.match(str_type)
|
|
|
516
|
|
|
517 class GdbPrettyPrinters(gdb.printing.PrettyPrinter):
|
|
|
518 def __init__(self, name):
|
|
|
519 super(GdbPrettyPrinters, self).__init__(name, [])
|
|
|
520
|
|
|
521 def add_printer_for_types(self, name, class_, types):
|
|
|
522 self.subprinters.append(GdbSubprinterTypeList(name, class_, types))
|
|
|
523
|
|
|
524 def add_printer_for_regex(self, name, class_, regex):
|
|
|
525 self.subprinters.append(GdbSubprinterRegex(name, class_, regex))
|
|
|
526
|
|
|
527 def __call__(self, gdbval):
|
|
|
528 type_ = gdbval.type.unqualified()
|
|
|
529 str_type = str(type_)
|
|
|
530 for printer in self.subprinters:
|
|
|
531 if printer.enabled and printer.handles_type(str_type):
|
|
|
532 return printer.class_(gdbval)
|
|
|
533
|
|
|
534 # Couldn't find a pretty printer (or it was disabled):
|
|
|
535 return None
|
|
|
536
|
|
|
537
|
|
|
538 def build_pretty_printer():
|
|
|
539 pp = GdbPrettyPrinters('gcc')
|
|
|
540 pp.add_printer_for_types(['tree'],
|
|
|
541 'tree', TreePrinter)
|
|
131
|
542 pp.add_printer_for_types(['cgraph_node *', 'varpool_node *', 'symtab_node *'],
|
|
|
543 'symtab_node', SymtabNodePrinter)
|
|
|
544 pp.add_printer_for_types(['cgraph_edge *'],
|
|
|
545 'cgraph_edge', CgraphEdgePrinter)
|
|
|
546 pp.add_printer_for_types(['ipa_ref *'],
|
|
|
547 'ipa_ref', IpaReferencePrinter)
|
|
111
|
548 pp.add_printer_for_types(['dw_die_ref'],
|
|
|
549 'dw_die_ref', DWDieRefPrinter)
|
|
|
550 pp.add_printer_for_types(['gimple', 'gimple *',
|
|
|
551
|
|
|
552 # Keep this in the same order as gimple.def:
|
|
|
553 'gimple_cond', 'const_gimple_cond',
|
|
|
554 'gimple_statement_cond *',
|
|
|
555 'gimple_debug', 'const_gimple_debug',
|
|
|
556 'gimple_statement_debug *',
|
|
|
557 'gimple_label', 'const_gimple_label',
|
|
|
558 'gimple_statement_label *',
|
|
|
559 'gimple_switch', 'const_gimple_switch',
|
|
|
560 'gimple_statement_switch *',
|
|
|
561 'gimple_assign', 'const_gimple_assign',
|
|
|
562 'gimple_statement_assign *',
|
|
|
563 'gimple_bind', 'const_gimple_bind',
|
|
|
564 'gimple_statement_bind *',
|
|
|
565 'gimple_phi', 'const_gimple_phi',
|
|
|
566 'gimple_statement_phi *'],
|
|
|
567
|
|
|
568 'gimple',
|
|
|
569 GimplePrinter)
|
|
|
570 pp.add_printer_for_types(['basic_block', 'basic_block_def *'],
|
|
|
571 'basic_block',
|
|
|
572 BasicBlockPrinter)
|
|
|
573 pp.add_printer_for_types(['edge', 'edge_def *'],
|
|
|
574 'edge',
|
|
|
575 CfgEdgePrinter)
|
|
|
576 pp.add_printer_for_types(['rtx_def *'], 'rtx_def', RtxPrinter)
|
|
|
577 pp.add_printer_for_types(['opt_pass *'], 'opt_pass', PassPrinter)
|
|
|
578
|
|
|
579 pp.add_printer_for_regex(r'vec<(\S+), (\S+), (\S+)> \*',
|
|
|
580 'vec',
|
|
|
581 VecPrinter)
|
|
|
582
|
|
|
583 pp.add_printer_for_regex(r'opt_mode<(\S+)>',
|
|
|
584 'opt_mode', OptMachineModePrinter)
|
|
|
585 pp.add_printer_for_types(['opt_scalar_int_mode',
|
|
|
586 'opt_scalar_float_mode',
|
|
|
587 'opt_scalar_mode'],
|
|
|
588 'opt_mode', OptMachineModePrinter)
|
|
|
589 pp.add_printer_for_regex(r'pod_mode<(\S+)>',
|
|
|
590 'pod_mode', MachineModePrinter)
|
|
|
591 pp.add_printer_for_types(['scalar_int_mode_pod',
|
|
|
592 'scalar_mode_pod'],
|
|
|
593 'pod_mode', MachineModePrinter)
|
|
|
594 for mode in ('scalar_mode', 'scalar_int_mode', 'scalar_float_mode',
|
|
|
595 'complex_mode'):
|
|
|
596 pp.add_printer_for_types([mode], mode, MachineModePrinter)
|
|
|
597
|
|
|
598 return pp
|
|
|
599
|
|
|
600 gdb.printing.register_pretty_printer(
|
|
|
601 gdb.current_objfile(),
|
|
|
602 build_pretty_printer())
|
|
|
603
|
|
|
604 def find_gcc_source_dir():
|
|
|
605 # Use location of global "g" to locate the source tree
|
|
|
606 sym_g = gdb.lookup_global_symbol('g')
|
|
|
607 path = sym_g.symtab.filename # e.g. '../../src/gcc/context.h'
|
|
|
608 srcdir = os.path.split(path)[0] # e.g. '../../src/gcc'
|
|
|
609 return srcdir
|
|
|
610
|
|
|
611 class PassNames:
|
|
|
612 """Parse passes.def, gathering a list of pass class names"""
|
|
|
613 def __init__(self):
|
|
|
614 srcdir = find_gcc_source_dir()
|
|
|
615 self.names = []
|
|
|
616 with open(os.path.join(srcdir, 'passes.def')) as f:
|
|
|
617 for line in f:
|
|
|
618 m = re.match('\s*NEXT_PASS \(([^,]+).*\);', line)
|
|
|
619 if m:
|
|
|
620 self.names.append(m.group(1))
|
|
|
621
|
|
|
622 class BreakOnPass(gdb.Command):
|
|
|
623 """
|
|
|
624 A custom command for putting breakpoints on the execute hook of passes.
|
|
|
625 This is largely a workaround for issues with tab-completion in gdb when
|
|
|
626 setting breakpoints on methods on classes within anonymous namespaces.
|
|
|
627
|
|
|
628 Example of use: putting a breakpoint on "final"
|
|
|
629 (gdb) break-on-pass
|
|
|
630 Press <TAB>; it autocompletes to "pass_":
|
|
|
631 (gdb) break-on-pass pass_
|
|
|
632 Press <TAB>:
|
|
|
633 Display all 219 possibilities? (y or n)
|
|
|
634 Press "n"; then type "f":
|
|
|
635 (gdb) break-on-pass pass_f
|
|
|
636 Press <TAB> to autocomplete to pass classnames beginning with "pass_f":
|
|
|
637 pass_fast_rtl_dce pass_fold_builtins
|
|
|
638 pass_feedback_split_functions pass_forwprop
|
|
|
639 pass_final pass_fre
|
|
|
640 pass_fixup_cfg pass_free_cfg
|
|
|
641 Type "in<TAB>" to complete to "pass_final":
|
|
|
642 (gdb) break-on-pass pass_final
|
|
|
643 ...and hit <RETURN>:
|
|
|
644 Breakpoint 6 at 0x8396ba: file ../../src/gcc/final.c, line 4526.
|
|
|
645 ...and we have a breakpoint set; continue execution:
|
|
|
646 (gdb) cont
|
|
|
647 Continuing.
|
|
|
648 Breakpoint 6, (anonymous namespace)::pass_final::execute (this=0x17fb990) at ../../src/gcc/final.c:4526
|
|
|
649 4526 virtual unsigned int execute (function *) { return rest_of_handle_final (); }
|
|
|
650 """
|
|
|
651 def __init__(self):
|
|
|
652 gdb.Command.__init__(self, 'break-on-pass', gdb.COMMAND_BREAKPOINTS)
|
|
|
653 self.pass_names = None
|
|
|
654
|
|
|
655 def complete(self, text, word):
|
|
|
656 # Lazily load pass names:
|
|
|
657 if not self.pass_names:
|
|
|
658 self.pass_names = PassNames()
|
|
|
659
|
|
|
660 return [name
|
|
|
661 for name in sorted(self.pass_names.names)
|
|
|
662 if name.startswith(text)]
|
|
|
663
|
|
|
664 def invoke(self, arg, from_tty):
|
|
|
665 sym = '(anonymous namespace)::%s::execute' % arg
|
|
|
666 breakpoint = gdb.Breakpoint(sym)
|
|
|
667
|
|
|
668 BreakOnPass()
|
|
|
669
|
|
|
670 class DumpFn(gdb.Command):
|
|
|
671 """
|
|
|
672 A custom command to dump a gimple/rtl function to file. By default, it
|
|
|
673 dumps the current function using 0 as dump_flags, but the function and flags
|
|
|
674 can also be specified. If /f <file> are passed as the first two arguments,
|
|
|
675 the dump is written to that file. Otherwise, a temporary file is created
|
|
|
676 and opened in the text editor specified in the EDITOR environment variable.
|
|
|
677
|
|
|
678 Examples of use:
|
|
|
679 (gdb) dump-fn
|
|
|
680 (gdb) dump-fn /f foo.1.txt
|
|
|
681 (gdb) dump-fn cfun->decl
|
|
|
682 (gdb) dump-fn /f foo.1.txt cfun->decl
|
|
|
683 (gdb) dump-fn cfun->decl 0
|
|
|
684 (gdb) dump-fn cfun->decl dump_flags
|
|
|
685 """
|
|
|
686
|
|
|
687 def __init__(self):
|
|
|
688 gdb.Command.__init__(self, 'dump-fn', gdb.COMMAND_USER)
|
|
|
689
|
|
|
690 def invoke(self, arg, from_tty):
|
|
|
691 # Parse args, check number of args
|
|
|
692 args = gdb.string_to_argv(arg)
|
|
|
693 if len(args) >= 1 and args[0] == "/f":
|
|
|
694 if len(args) == 1:
|
|
|
695 print ("Missing file argument")
|
|
|
696 return
|
|
|
697 filename = args[1]
|
|
|
698 editor_mode = False
|
|
|
699 base_arg = 2
|
|
|
700 else:
|
|
|
701 editor = os.getenv("EDITOR", "")
|
|
|
702 if editor == "":
|
|
|
703 print ("EDITOR environment variable not defined")
|
|
|
704 return
|
|
|
705 editor_mode = True
|
|
|
706 base_arg = 0
|
|
|
707 if len(args) - base_arg > 2:
|
|
|
708 print ("Too many arguments")
|
|
|
709 return
|
|
|
710
|
|
|
711 # Set func
|
|
|
712 if len(args) - base_arg >= 1:
|
|
|
713 funcname = args[base_arg]
|
|
|
714 printfuncname = "function %s" % funcname
|
|
|
715 else:
|
|
|
716 funcname = "cfun ? cfun->decl : current_function_decl"
|
|
|
717 printfuncname = "current function"
|
|
|
718 func = gdb.parse_and_eval(funcname)
|
|
|
719 if func == 0:
|
|
|
720 print ("Could not find %s" % printfuncname)
|
|
|
721 return
|
|
|
722 func = "(tree)%u" % func
|
|
|
723
|
|
|
724 # Set flags
|
|
|
725 if len(args) - base_arg >= 2:
|
|
|
726 flags = gdb.parse_and_eval(args[base_arg + 1])
|
|
|
727 else:
|
|
|
728 flags = 0
|
|
|
729
|
|
|
730 # Get tempory file, if necessary
|
|
|
731 if editor_mode:
|
|
|
732 f = tempfile.NamedTemporaryFile(delete=False, suffix=".txt")
|
|
|
733 filename = f.name
|
|
|
734 f.close()
|
|
|
735
|
|
|
736 # Open file
|
|
|
737 fp = gdb.parse_and_eval("fopen (\"%s\", \"w\")" % filename)
|
|
|
738 if fp == 0:
|
|
|
739 print ("Could not open file: %s" % filename)
|
|
|
740 return
|
|
|
741 fp = "(FILE *)%u" % fp
|
|
|
742
|
|
|
743 # Dump function to file
|
|
|
744 _ = gdb.parse_and_eval("dump_function_to_file (%s, %s, %u)" %
|
|
|
745 (func, fp, flags))
|
|
|
746
|
|
|
747 # Close file
|
|
|
748 ret = gdb.parse_and_eval("fclose (%s)" % fp)
|
|
|
749 if ret != 0:
|
|
|
750 print ("Could not close file: %s" % filename)
|
|
|
751 return
|
|
|
752
|
|
|
753 # Open file in editor, if necessary
|
|
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754 if editor_mode:
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755 os.system("( %s \"%s\"; rm \"%s\" ) &" %
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756 (editor, filename, filename))
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|
|
757
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|
|
758 DumpFn()
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|
|
759
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760 class DotFn(gdb.Command):
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|
|
761 """
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|
|
762 A custom command to show a gimple/rtl function control flow graph.
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|
763 By default, it show the current function, but the function can also be
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|
|
764 specified.
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|
|
765
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766 Examples of use:
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|
|
767 (gdb) dot-fn
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|
768 (gdb) dot-fn cfun
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|
769 (gdb) dot-fn cfun 0
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|
770 (gdb) dot-fn cfun dump_flags
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|
771 """
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|
|
772 def __init__(self):
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773 gdb.Command.__init__(self, 'dot-fn', gdb.COMMAND_USER)
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|
|
774
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|
|
775 def invoke(self, arg, from_tty):
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|
|
776 # Parse args, check number of args
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|
|
777 args = gdb.string_to_argv(arg)
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|
|
778 if len(args) > 2:
|
|
|
779 print("Too many arguments")
|
|
|
780 return
|
|
|
781
|
|
|
782 # Set func
|
|
|
783 if len(args) >= 1:
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|
|
784 funcname = args[0]
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|
|
785 printfuncname = "function %s" % funcname
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|
|
786 else:
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|
|
787 funcname = "cfun"
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|
|
788 printfuncname = "current function"
|
|
|
789 func = gdb.parse_and_eval(funcname)
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|
790 if func == 0:
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|
|
791 print("Could not find %s" % printfuncname)
|
|
|
792 return
|
|
|
793 func = "(struct function *)%s" % func
|
|
|
794
|
|
|
795 # Set flags
|
|
|
796 if len(args) >= 2:
|
|
|
797 flags = gdb.parse_and_eval(args[1])
|
|
|
798 else:
|
|
|
799 flags = 0
|
|
|
800
|
|
|
801 # Get temp file
|
|
|
802 f = tempfile.NamedTemporaryFile(delete=False)
|
|
|
803 filename = f.name
|
|
|
804
|
|
|
805 # Close and reopen temp file to get C FILE*
|
|
|
806 f.close()
|
|
|
807 fp = gdb.parse_and_eval("fopen (\"%s\", \"w\")" % filename)
|
|
|
808 if fp == 0:
|
|
|
809 print("Cannot open temp file")
|
|
|
810 return
|
|
|
811 fp = "(FILE *)%u" % fp
|
|
|
812
|
|
|
813 # Write graph to temp file
|
|
|
814 _ = gdb.parse_and_eval("start_graph_dump (%s, \"<debug>\")" % fp)
|
|
|
815 _ = gdb.parse_and_eval("print_graph_cfg (%s, %s, %u)"
|
|
|
816 % (fp, func, flags))
|
|
|
817 _ = gdb.parse_and_eval("end_graph_dump (%s)" % fp)
|
|
|
818
|
|
|
819 # Close temp file
|
|
|
820 ret = gdb.parse_and_eval("fclose (%s)" % fp)
|
|
|
821 if ret != 0:
|
|
|
822 print("Could not close temp file: %s" % filename)
|
|
|
823 return
|
|
|
824
|
|
|
825 # Show graph in temp file
|
|
|
826 os.system("( dot -Tx11 \"%s\"; rm \"%s\" ) &" % (filename, filename))
|
|
|
827
|
|
|
828 DotFn()
|
|
|
829
|
|
|
830 print('Successfully loaded GDB hooks for GCC')
|
