Mercurial > octave
annotate libinterp/corefcn/stack-frame.h @ 29476:c74ff452e2bb stable
avoid memory leaks when returning handles to nested functions
When a handle to a nested function is created with a std::shared_ptr
object holding a reference to the stack frames associated with the
parent function, we create a circular reference because the referenced
stack frame contains the function handle object. To break the link,
we'll scan the stack frame associated with the nested function handle
and convert the shared_ptr links to be weak_ptr links instead,
breaking the circular reference allowing the resources held by the
closure frames to be released when all external references are cleared.
Another possible solution to this problem is to create weak_ptr links
initially and then convert them to shared_ptr links when the closure
"escapes" the scope of the function. While that might be slightly
more efficient (we would only have to look at assignments to global
variables and the values that are actually returned from the
function) the current design of global assignments does not make that
easy because it is possible to ask for a reference to a global
variable, so either all places where we grab references and then later
perform assignments must be checked for assignments of handles to
nested functions, or we must eliminate the interface that returns
references to global variables and only allow assignments so that we
would only have to perform the check in the assignment function(s).
Perhaps this can be done in a future version, but for now, it works
well enough to break the closure cycles in local variables when a
function returns.
* call-stack.cc (call_stack::pop): If popped stack frame is a closure
context, then break closure cycles.
* stack-frame.h, stack-frame.cc (stack_frame::m_is_closure_context):
New member variable.
(stack_frame::break_closure_cycles,
user_fcn_stack_frame::break_closure_cycles): New functions.
(stack_frame::mark_closure_context, stack_frame::is_closure_context):
New functions.
* ov-fcn-handle.h, ov-fcn-handle.cc (base_nested_fcn_handle):
New base class for handles to nested functions.
(nested_fcn_handle, weak_nested_fcn_handle): New classes to represent
handles to nested functions. Currently, all handles to nested
functions begin as nested_fcn_handle objects but are converted to
weak_nested_fcn_handles when the functions where they are created
return.
(base_fcn_handle::is_nested (const std::shared_ptr<stack_frame>&) const,
base_fcn_handle::make_weak_nested_handle,
New virtual functions.
(octave_fcn_handle::is_nested, octave_fcn_handle::is_weak_nested,
octave_fcn_handle::make_weak_nested_handle): New functions.
* ov-struct.h, ov-struct.cc (octave_scalar_map::break_closure_cycles,
octave_map::break_closure_cycles): New functions.
* ov.h, ov.cc (octave_value::break_closure_cycles): New function.
* ov-base.h (octave_base_value::break_closure_cycles): New virtual function.
* cdef-object.h (cdef_object::break_closure_cycles): New function.
(cdef_object_rep::break_closure_cycles): New virtual function.
* cdef-object.h, cdef-object.cc (cdef_object_scalar::break_closure_cycles):
New function.
* ov-cell.h, ov-cell.cc (octave_cell::break_closure_cycles): New function.
* ov-class.h, ov-class.cc (octave_class::break_closure_cycles): New function.
* ov-classdef.h (octave_classdef::break_closure_cycles): New function.
author | John W. Eaton <jwe@octave.org> |
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date | Fri, 05 Mar 2021 16:14:34 -0500 |
parents | 0a5b15007766 |
children | 34d06c73b48d |
rev | line source |
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1 //////////////////////////////////////////////////////////////////////// |
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2 // |
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3 // Copyright (C) 1993-2021 The Octave Project Developers |
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4 // |
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5 // See the file COPYRIGHT.md in the top-level directory of this |
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6 // distribution or <https://octave.org/copyright/>. |
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7 // |
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8 // This file is part of Octave. |
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9 // |
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10 // Octave is free software: you can redistribute it and/or modify it |
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11 // under the terms of the GNU General Public License as published by |
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12 // the Free Software Foundation, either version 3 of the License, or |
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13 // (at your option) any later version. |
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14 // |
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15 // Octave is distributed in the hope that it will be useful, but |
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16 // WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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18 // GNU General Public License for more details. |
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19 // |
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20 // You should have received a copy of the GNU General Public License |
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21 // along with Octave; see the file COPYING. If not, see |
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22 // <https://www.gnu.org/licenses/>. |
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23 // |
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24 //////////////////////////////////////////////////////////////////////// |
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25 |
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26 #if ! defined (octave_stack_frame_h) |
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27 #define octave_stack_frame_h 1 |
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28 |
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29 #include "octave-config.h" |
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30 |
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31 #include <deque> |
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32 #include <iosfwd> |
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33 #include <list> |
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34 #include <map> |
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35 #include <memory> |
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36 #include <string> |
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37 |
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38 class octave_value; |
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39 class octave_value_list; |
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40 |
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41 #include "error.h" |
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42 #include "ov-fcn.h" |
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43 #include "ov-usr-fcn.h" |
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44 #include "syminfo.h" |
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45 #include "symscope.h" |
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46 |
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47 // Variable values are stored in the stack_frame objects that make up |
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48 // the call_stack. There are four separate stack_frame objects |
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49 // corresponding to the following language elements: |
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50 // |
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51 // * user-defined functions |
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52 // |
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53 // These are .m files. They have local variables. |
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54 // |
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55 // * scripts |
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56 // |
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57 // These are .m files, but not functions. They access variables, |
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58 // but do not store any values directly. All values are stored in |
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59 // the stack frame corresponding to the scope in which they are |
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60 // executed. |
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61 // |
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62 // * scopes that do not correspond to functions |
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63 // |
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64 // This is primarily used by the top-level scope but the |
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65 // interpreter may also create temporary scopes in which to |
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66 // evaluate functions or scripts. |
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67 // |
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68 // * compiled functions |
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69 // |
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70 // These are built-in functions and dynamically-loaded compiled |
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71 // functions (.mex and .oct files) and do not contain variable |
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72 // values of their own. They are skipped when Octave displays a |
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73 // stack trace. |
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74 // |
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75 // All stack frames also contain the following data: |
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76 // |
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77 // * a reference to the evaluator that contains the frame |
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78 // |
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79 // Global variables are now stored in the evaluator and this link |
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80 // gives us immediate access to them. |
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81 // |
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82 // * line and column in the source file where the stack frame was created |
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83 // |
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84 // These values are used to print stack traces. |
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85 // |
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86 // * A pointer to the nearest parent frame that contains variable |
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87 // info (the "static" link) |
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88 // |
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89 // A frame that contains variable info may be a user-defined |
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90 // function, script, or scope frame. This pointer should never |
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91 // point to a compiled function stack frame. |
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92 // |
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93 // * A pointer to the nearest lexical parent frame (the "access" link) |
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94 // |
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95 // Used to access non-local variables for nested and anonymous |
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96 // functions or as a link to the parent frame in which a script is |
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97 // executed. This pointer should only point to a parent function |
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98 // stack frame. |
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99 |
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100 namespace octave |
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101 { |
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102 class tree_evaluator; |
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103 class symbol_info_list; |
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104 class unwind_protect; |
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105 |
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106 class stack_frame_walker; |
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107 |
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108 class stack_frame |
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109 { |
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110 public: |
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111 |
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112 typedef std::map<std::string, octave_value> local_vars_map; |
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113 |
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114 // Markers indicating the type of a variable. Values for local |
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115 // variables are stored in the stack frame. Values for |
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116 // global variables are stored in the tree_evaluator object that |
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117 // contains the stack frame. Values for persistent variables are |
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118 // stored in the function scope corresponding to the stack frame. |
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119 |
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120 enum scope_flags |
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121 { |
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122 LOCAL, |
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123 GLOBAL, |
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124 PERSISTENT |
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125 }; |
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126 |
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127 // Index into the list of automatic variables for user-defined |
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128 // function stack frames. |
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129 |
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130 enum auto_var_type |
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131 { |
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132 ARG_NAMES, |
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133 IGNORED, |
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134 NARGIN, |
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135 NARGOUT, |
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136 SAVED_WARNING_STATES, |
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137 NUM_AUTO_VARS |
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138 }; |
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139 |
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140 stack_frame (void) = delete; |
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141 |
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142 stack_frame (tree_evaluator& tw, size_t index, |
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143 const std::shared_ptr<stack_frame>& parent_link, |
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144 const std::shared_ptr<stack_frame>& static_link, |
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145 const std::shared_ptr<stack_frame>& access_link) |
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146 : m_evaluator (tw), m_is_closure_context (false), |
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147 m_line (-1), m_column (-1), m_index (index), |
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148 m_parent_link (parent_link), m_static_link (static_link), |
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149 m_access_link (access_link), m_dispatch_class () |
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150 { } |
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151 |
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152 // Compiled function. |
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153 static stack_frame * |
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154 create (tree_evaluator& tw, octave_function *fcn, size_t index, |
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155 const std::shared_ptr<stack_frame>& parent_link, |
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156 const std::shared_ptr<stack_frame>& static_link); |
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157 |
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158 // Script. |
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159 static stack_frame * |
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160 create (tree_evaluator& tw, octave_user_script *script, size_t index, |
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161 const std::shared_ptr<stack_frame>& parent_link, |
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162 const std::shared_ptr<stack_frame>& static_link); |
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163 |
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164 // User-defined function. |
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165 static stack_frame * |
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166 create (tree_evaluator& tw, octave_user_function *fcn, size_t index, |
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167 const std::shared_ptr<stack_frame>& parent_link, |
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168 const std::shared_ptr<stack_frame>& static_link, |
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169 const std::shared_ptr<stack_frame>& access_link = std::shared_ptr<stack_frame> ()); |
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170 |
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171 // Anonymous user-defined function with init vars. |
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172 static stack_frame * |
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173 create (tree_evaluator& tw, octave_user_function *fcn, size_t index, |
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174 const std::shared_ptr<stack_frame>& parent_link, |
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175 const std::shared_ptr<stack_frame>& static_link, |
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176 const local_vars_map& local_vars); |
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177 |
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178 // Scope. |
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179 static stack_frame * |
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180 create (tree_evaluator& tw, const symbol_scope& scope, size_t index, |
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181 const std::shared_ptr<stack_frame>& parent_link, |
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182 const std::shared_ptr<stack_frame>& static_link); |
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183 |
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184 stack_frame (const stack_frame& elt) = default; |
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185 |
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186 stack_frame& operator = (const stack_frame& elt) = delete; |
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187 |
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188 virtual ~stack_frame (void) = default; |
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189 |
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190 // FIXME: It would be nice to eliminate these but there are a few |
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191 // places where we still need to know the specific type of the |
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192 // stack frame that we are handling. |
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193 |
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194 virtual bool is_compiled_fcn_frame (void) const { return false; } |
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195 virtual bool is_user_script_frame (void) const { return false; } |
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196 virtual bool is_user_fcn_frame (void) const { return false; } |
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197 virtual bool is_scope_frame (void) const { return false; } |
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198 |
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199 virtual void clear_values (void); |
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200 |
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201 size_t index (void) const { return m_index; } |
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202 |
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203 void line (int l) { m_line = l; } |
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204 int line (void) const { return m_line; } |
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205 |
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206 void column (int c) { m_column = c; } |
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207 int column (void) const { return m_column; } |
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208 |
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209 std::string fcn_file_name (void) const |
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210 { |
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211 octave_function *fcn = function (); |
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212 |
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213 return fcn ? fcn->fcn_file_name () : ""; |
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214 } |
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215 |
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216 std::string fcn_name (bool print_subfn = true) const |
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217 { |
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218 std::string retval; |
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219 |
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220 octave_function *fcn = function (); |
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221 |
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222 if (fcn) |
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223 { |
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224 std::string parent_fcn_name = fcn->parent_fcn_name (); |
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225 |
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226 if (print_subfn && ! parent_fcn_name.empty ()) |
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227 retval = parent_fcn_name + '>'; |
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228 |
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229 if (fcn->is_anonymous_function ()) |
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230 retval += "@<anonymous>"; |
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231 else |
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232 retval += fcn->name (); |
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233 } |
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234 else |
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235 retval = "<unknown>"; |
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236 |
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237 return retval; |
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238 } |
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239 |
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240 virtual symbol_scope get_scope (void) const = 0; |
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241 |
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242 virtual octave_function * function (void) const { return nullptr; } |
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243 |
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244 virtual unwind_protect * unwind_protect_frame (void) { return nullptr; } |
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245 |
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246 symbol_info_list |
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247 make_symbol_info_list (const std::list<symbol_record>& symrec_list) const; |
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248 |
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249 octave_value who (const string_vector& patterns, bool have_regexp, |
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250 bool return_list, bool verbose, |
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251 const std::string& whos_line_fmt, |
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252 const std::string& msg); |
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253 |
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254 symbol_info_list all_variables (void); |
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255 |
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256 octave_value workspace (void); |
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257 |
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258 std::list<std::string> variable_names (void) const; |
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259 |
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260 // Look for named symbol visible from current scope. Don't |
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261 // attempt to insert if missing. |
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262 virtual symbol_record lookup_symbol (const std::string&) const = 0; |
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263 |
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264 // Look for named symbol visible from current scope. Attempt to |
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265 // insert if missing. |
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266 virtual symbol_record insert_symbol (const std::string&) = 0; |
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267 |
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268 symbol_info_list glob_symbol_info (const std::string& pattern); |
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269 |
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270 symbol_info_list regexp_symbol_info (const std::string& pattern); |
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271 |
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272 symbol_info_list get_symbol_info (void) |
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273 { |
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274 return all_variables (); |
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275 } |
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276 |
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277 void make_persistent (const symbol_record& sym) |
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278 { |
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279 if (sym.is_formal ()) |
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280 { |
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281 std::string nm = sym.name (); |
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282 error ("can't make function parameter %s persistent", nm.c_str ()); |
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283 } |
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284 |
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285 if (is_global (sym)) |
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286 { |
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287 std::string nm = sym.name (); |
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288 error ("can't make global variable '%s' persistent", nm.c_str ()); |
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289 } |
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290 |
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291 install_variable (sym, octave_value (), false); |
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292 |
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293 mark_persistent (sym); |
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294 } |
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295 |
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296 void make_global (const symbol_record& sym) |
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297 { |
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298 if (is_persistent (sym)) |
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299 { |
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300 std::string nm = sym.name (); |
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301 error ("can't make persistent variable '%s' global", nm.c_str ()); |
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302 } |
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303 |
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304 install_variable (sym, octave_value (), true); |
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305 |
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306 mark_global (sym); |
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307 } |
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308 |
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309 std::shared_ptr<stack_frame> |
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310 parent_link (void) const {return m_parent_link; } |
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311 |
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312 std::shared_ptr<stack_frame> |
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313 static_link (void) const {return m_static_link; } |
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314 |
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315 std::shared_ptr<stack_frame> |
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316 access_link (void) const {return m_access_link; } |
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317 |
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318 virtual size_t size (void) const; |
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319 |
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320 virtual void resize (size_t); |
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321 |
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322 void mark_global (const symbol_record& sym) |
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323 { |
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324 mark_scope (sym, GLOBAL); |
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325 } |
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326 |
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327 void unmark_global (const symbol_record& sym) |
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328 { |
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329 mark_scope (sym, LOCAL); |
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330 } |
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331 |
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332 void mark_persistent (const symbol_record& sym) |
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333 { |
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334 mark_scope (sym, PERSISTENT); |
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335 } |
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336 |
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337 void unmark_persistent (const symbol_record& sym) |
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338 { |
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339 mark_scope (sym, LOCAL); |
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340 } |
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341 |
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342 bool is_defined (const symbol_record& sym) const |
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343 { |
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344 octave_value val = varval (sym); |
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345 |
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346 return val.is_defined (); |
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347 } |
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348 |
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349 bool is_variable (const symbol_record& sym) const |
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350 { |
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351 octave_value val = varval (sym); |
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352 |
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353 return val.is_defined (); |
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354 } |
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355 |
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356 bool is_variable (const std::string& name) const |
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357 { |
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358 symbol_record sym = lookup_symbol (name); |
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359 |
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360 return sym ? is_variable (sym) : false; |
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361 } |
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362 |
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363 bool is_local_variable (const std::string& name) const |
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364 { |
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365 symbol_record sym = lookup_symbol (name); |
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366 |
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367 return sym ? (is_variable (sym) && ! is_global (sym)) : false; |
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368 } |
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369 |
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370 bool is_object (const symbol_record& sym) const |
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371 { |
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372 octave_value val = varval (sym); |
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373 |
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374 return val.isobject (); |
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375 } |
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376 |
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377 bool is_object (const std::string& name) const |
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378 { |
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379 symbol_record sym = lookup_symbol (name); |
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380 |
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381 return sym ? is_object (sym) : false; |
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382 } |
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383 |
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384 virtual scope_flags scope_flag (const symbol_record&) const = 0; |
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385 |
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386 virtual scope_flags get_scope_flag (size_t) const; |
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387 |
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388 virtual void set_scope_flag (size_t, scope_flags); |
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389 |
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390 bool is_global (const symbol_record& sym) const |
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391 { |
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392 return scope_flag (sym) == GLOBAL; |
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393 } |
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394 |
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395 bool is_global (const std::string& name) const |
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396 { |
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397 symbol_record sym = lookup_symbol (name); |
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398 |
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399 return sym ? is_global (sym) : false; |
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400 } |
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401 |
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402 bool is_persistent (const symbol_record& sym) const |
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403 { |
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404 return scope_flag (sym) == PERSISTENT; |
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405 } |
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406 |
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407 bool is_persistent (const std::string& name) const |
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408 { |
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409 symbol_record sym = lookup_symbol (name); |
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410 |
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411 return sym ? is_persistent (sym) : false; |
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412 } |
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413 |
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414 void install_variable (const symbol_record& sym, |
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415 const octave_value& value, bool global); |
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416 |
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417 void install_variable (const std::string& name, |
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418 const octave_value& value, bool global) |
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419 { |
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420 symbol_record sym = insert_symbol (name); |
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421 |
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422 install_variable (sym, value, global); |
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423 } |
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424 |
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425 virtual octave_value get_auto_fcn_var (auto_var_type) const = 0; |
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426 |
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427 virtual void set_auto_fcn_var (auto_var_type, const octave_value&) = 0; |
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428 |
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429 virtual octave_value varval (const symbol_record& sym) const = 0;; |
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430 |
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431 virtual octave_value varval (size_t data_offset) const; |
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432 |
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433 octave_value varval (const std::string& name) const |
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434 { |
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435 symbol_record sym = lookup_symbol (name); |
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436 |
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437 return sym ? varval (sym) : octave_value (); |
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438 } |
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439 |
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440 virtual octave_value& varref (const symbol_record& sym) = 0; |
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441 |
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442 virtual octave_value& varref (size_t data_offset); |
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443 |
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444 void assign (const symbol_record& sym, const octave_value& val) |
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445 { |
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446 octave_value& lhs = varref (sym); |
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447 |
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448 if (lhs.get_count () == 1) |
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449 lhs.call_object_destructor (); |
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450 |
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451 // Regularize a null matrix if stored into a variable. |
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452 lhs = val.storable_value (); |
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453 } |
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454 |
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455 void assign (const std::string& name, const octave_value& val) |
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456 { |
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457 symbol_record sym = insert_symbol (name); |
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458 |
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459 assign (sym, val); |
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460 } |
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461 |
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462 void assign (octave_value::assign_op op, const symbol_record& sym, |
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463 const std::string& type, |
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464 const std::list<octave_value_list>& idx, |
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465 const octave_value& rhs) |
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466 { |
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467 if (idx.empty ()) |
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468 { |
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469 if (op == octave_value::op_asn_eq) |
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470 assign (sym, rhs); |
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471 else |
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472 varref (sym).assign (op, rhs); |
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473 } |
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474 else |
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475 varref (sym).assign (op, type, idx, rhs); |
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476 } |
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477 |
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478 void do_non_const_unary_op (octave_value::unary_op op, |
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479 const symbol_record& sym, |
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480 const std::string& type, |
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481 const std::list<octave_value_list>& idx) |
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482 { |
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483 if (idx.empty ()) |
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484 varref (sym).do_non_const_unary_op (op); |
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485 else |
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486 varref (sym).do_non_const_unary_op (op, type, idx); |
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487 } |
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488 |
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489 octave_value value (const symbol_record& sym, const std::string& type, |
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490 const std::list<octave_value_list>& idx) const |
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491 { |
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492 octave_value retval = varval (sym); |
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493 |
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494 if (! idx.empty ()) |
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495 { |
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496 if (retval.is_constant ()) |
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497 retval = retval.subsref (type, idx); |
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498 else |
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499 { |
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500 octave_value_list t = retval.subsref (type, idx, 1); |
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501 |
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502 retval = t.length () > 0 ? t(0) : octave_value (); |
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503 } |
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504 } |
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505 |
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506 return retval; |
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507 } |
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508 |
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509 octave_value find_subfunction (const std::string& name) const |
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510 { |
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511 symbol_scope scope = get_scope (); |
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512 |
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513 return scope.find_subfunction (name); |
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514 } |
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515 |
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516 void clear (const symbol_record& sym) |
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517 { |
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518 if (is_global (sym)) |
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519 unmark_global (sym); |
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520 |
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521 assign (sym, octave_value ()); |
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522 |
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523 if (is_persistent (sym)) |
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524 unmark_persistent (sym); |
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525 } |
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526 |
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527 void clear_objects (void); |
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528 |
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529 void clear_variable (const std::string& name); |
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530 |
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531 void clear_variable_pattern (const std::string& pattern); |
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532 void clear_variable_pattern (const string_vector& patterns); |
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533 |
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534 void clear_variable_regexp (const std::string& pattern); |
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535 void clear_variable_regexp (const string_vector& patterns); |
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536 |
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537 void clear_variables (void); |
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538 |
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539 std::string get_dispatch_class (void) const { return m_dispatch_class; } |
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540 |
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541 void set_dispatch_class (const std::string& class_name) |
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542 { |
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543 m_dispatch_class = class_name; |
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544 } |
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545 |
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546 void display_stopped_in_message (std::ostream& os) const; |
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547 |
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548 virtual void mark_scope (const symbol_record&, scope_flags) = 0; |
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549 |
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550 virtual void display (bool follow = true) const; |
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551 |
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552 virtual void accept (stack_frame_walker& sfw) = 0; |
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553 |
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554 virtual void break_closure_cycles (const std::shared_ptr<stack_frame>&) { } |
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555 |
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556 void mark_closure_context (void) { m_is_closure_context = true; } |
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557 bool is_closure_context (void) const { return m_is_closure_context; } |
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558 |
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559 protected: |
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560 |
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561 // Reference to the call stack that contains this frame. Global |
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562 // variables are stored in the call stack. This link gives us |
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563 // immediate access to them. |
27211
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564 tree_evaluator& m_evaluator; |
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565 |
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566 // TRUE if this stack frame is saved with a handle to a nested |
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567 // function (closure). |
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568 bool m_is_closure_context; |
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569 |
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570 // The line and column of the source file where this stack frame |
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571 // was created. Used to print stack traces. |
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572 int m_line; |
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573 int m_column; |
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574 |
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575 // Index in call stack. |
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576 size_t m_index; |
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577 |
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578 // Pointer to the nearest parent frame. May include compiled |
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579 // functions. |
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580 std::shared_ptr<stack_frame> m_parent_link; |
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581 |
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582 // Pointer to the nearest parent frame that contains variable |
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583 // information (script, function, or scope). This link skips over |
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584 // compiled function parent frames. |
28426
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use shared_ptr for stack frames in call stack and for accesss and static links
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585 std::shared_ptr<stack_frame> m_static_link; |
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586 |
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587 // Pointer to the nearest lexical parent frame. Used to access |
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588 // non-local variables for nested and anonymous functions or as a |
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589 // link to the parent frame in which a script is executed. |
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590 std::shared_ptr<stack_frame> m_access_link; |
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591 |
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592 // Allow function handles to temporarily store their dispatch class |
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593 // in the call stack. |
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594 std::string m_dispatch_class; |
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595 }; |
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596 } |
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|
597 |
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598 #endif |