1 | # RTEMS Tools Project (http://www.rtems.org/) |
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2 | # Copyright 2010-2014 Chris Johns (chrisj@rtems.org) |
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3 | # All rights reserved. |
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4 | # |
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5 | # This file is part of the RTEMS Tools package in 'rtems-tools'. |
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6 | # |
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7 | # Redistribution and use in source and binary forms, with or without |
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8 | # modification, are permitted provided that the following conditions are met: |
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9 | # |
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10 | # 1. Redistributions of source code must retain the above copyright notice, |
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11 | # this list of conditions and the following disclaimer. |
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12 | # |
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13 | # 2. Redistributions in binary form must reproduce the above copyright notice, |
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14 | # this list of conditions and the following disclaimer in the documentation |
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15 | # and/or other materials provided with the distribution. |
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16 | # |
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17 | # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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18 | # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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19 | # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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20 | # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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21 | # LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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22 | # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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23 | # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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24 | # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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25 | # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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26 | # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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27 | # POSSIBILITY OF SUCH DAMAGE. |
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28 | # |
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29 | |
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30 | # |
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31 | # RTEMS Chains Support |
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32 | # |
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33 | |
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34 | import gdb |
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35 | |
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36 | class node: |
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37 | """Manage the Chain_Node.""" |
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38 | |
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39 | def __init__(self, node_val): |
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40 | if node_val: |
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41 | if node_val.type.code == gdb.TYPE_CODE_PTR: |
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42 | self.reference = node_val |
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43 | self.node_val = node_val.dereference() |
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44 | else: |
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45 | self.node_val = node_val |
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46 | self.reference = node_val.address |
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47 | else: |
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48 | self.node_val = node_val |
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49 | |
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50 | def __str__(self): |
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51 | return self.to_string() |
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52 | |
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53 | def null(self): |
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54 | if not self.node_val: |
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55 | return True |
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56 | return False |
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57 | |
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58 | def next(self): |
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59 | if not self.null(): |
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60 | return self.node_val['next'] |
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61 | |
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62 | def previous(self): |
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63 | if not self.null(): |
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64 | return self.node_val['previous'] |
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65 | |
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66 | def cast(self, typename): |
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67 | if not self.null(): |
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68 | nodetype = gdb.lookup_type(typename) |
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69 | return self.node_val.cast(nodetype) |
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70 | return None |
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71 | |
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72 | def to_string(self): |
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73 | if self.null(): |
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74 | return 'NULL' |
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75 | return 'Node:%s Next:%s Prev:%s' % (self.reference, |
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76 | self.node_val['next'], |
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77 | self.node_val['previous']) |
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78 | |
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79 | class control: |
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80 | """Manage the Chain_Control.""" |
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81 | |
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82 | def __init__(self, ctrl): |
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83 | if ctrl.type.code == gdb.TYPE_CODE_PTR: |
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84 | self.reference = ctrl |
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85 | self.ctrl = ctrl.dereference() |
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86 | else: |
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87 | self.ctrl = ctrl |
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88 | self.reference = ctrl.address |
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89 | |
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90 | def first(self): |
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91 | t = node(self.ctrl['Head']['Node']) |
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92 | return t |
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93 | |
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94 | def tail(self): |
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95 | return node(self.ctrl['Tail']['Node']) |
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96 | |
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97 | def empty(self): |
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98 | if self.tail().previous() == self.reference: |
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99 | return True |
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100 | return False |
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