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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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20 02110-1301, USA. |
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21 |
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22 */ |
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23 |
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24 #ifdef HAVE_CONFIG_H |
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25 #include <config.h> |
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26 #endif |
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27 |
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28 #include "str-vec.h" |
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29 |
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30 #include <defaults.h> |
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31 #include "Cell.h" |
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32 #include "defun.h" |
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33 #include "error.h" |
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34 #include "input.h" |
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35 #include "oct-obj.h" |
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36 #include "ov-usr-fcn.h" |
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37 #include "ov.h" |
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38 #include "pager.h" |
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2985
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39 #include "pt-jump.h" |
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40 #include "pt-misc.h" |
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41 #include "pt-pr-code.h" |
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2982
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42 #include "pt-stmt.h" |
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43 #include "pt-walk.h" |
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44 #include "symtab.h" |
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45 #include "toplev.h" |
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46 #include "unwind-prot.h" |
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47 #include "utils.h" |
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48 #include "parse.h" |
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49 #include "variables.h" |
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50 |
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3131
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51 // Maximum nesting level for functions called recursively. |
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52 static int Vmax_recursion_depth = 256; |
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53 |
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54 // User defined functions. |
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55 |
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56 DEFINE_OCTAVE_ALLOCATOR (octave_user_function); |
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57 |
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58 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_user_function, |
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59 "user-defined function", |
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60 "user-defined function"); |
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61 |
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62 DEFINE_OCTAVE_ALLOCATOR (octave_user_script); |
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63 |
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64 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_user_script, |
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65 "user-defined script", |
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66 "user-defined script"); |
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67 |
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68 // Ugh. This really needs to be simplified (code/data? |
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69 // extrinsic/intrinsic state?). |
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70 |
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71 octave_user_function::octave_user_function |
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72 (tree_parameter_list *pl, tree_parameter_list *rl, |
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73 tree_statement_list *cl, symbol_table *st) |
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3523
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74 : octave_function (std::string (), std::string ()), |
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75 param_list (pl), ret_list (rl), cmd_list (cl), |
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76 sym_tab (st), lead_comm (), trail_comm (), file_name (), |
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3255
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77 t_parsed (static_cast<time_t> (0)), |
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78 t_checked (static_cast<time_t> (0)), |
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79 system_fcn_file (false), call_depth (0), num_named_args (0), |
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80 nested_function (false), inline_function (false), args_passed (), |
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81 num_args_passed (0), symtab_entry (0), argn_sr (0), |
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82 nargin_sr (0), nargout_sr (0), varargin_sr (0) |
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2974
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83 { |
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84 if (param_list) |
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85 num_named_args = param_list->length (); |
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2974
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86 } |
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87 |
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88 octave_user_function::~octave_user_function (void) |
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89 { |
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90 delete param_list; |
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91 delete ret_list; |
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92 delete sym_tab; |
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93 delete cmd_list; |
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94 delete lead_comm; |
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95 delete trail_comm; |
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2974
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96 } |
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97 |
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98 octave_user_function * |
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99 octave_user_function::define_ret_list (tree_parameter_list *t) |
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100 { |
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101 ret_list = t; |
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102 |
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103 return this; |
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104 } |
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105 |
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106 void |
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4343
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107 octave_user_function::stash_fcn_file_name (const std::string& nm) |
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108 { |
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4343
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109 file_name = nm; |
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2974
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110 } |
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111 |
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112 void |
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113 octave_user_function::mark_as_system_fcn_file (void) |
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114 { |
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115 if (! file_name.empty ()) |
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116 { |
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117 // We really should stash the whole path to the file we found, |
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118 // when we looked it up, to avoid possible race conditions... |
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119 // FIXME |
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120 // |
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121 // We probably also don't need to get the library directory |
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122 // every time, but since this function is only called when the |
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123 // function file is parsed, it probably doesn't matter that |
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124 // much. |
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125 |
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3523
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126 std::string ff_name = fcn_file_in_path (file_name); |
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127 |
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128 if (Vfcn_file_dir == ff_name.substr (0, Vfcn_file_dir.length ())) |
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129 system_fcn_file = 1; |
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130 } |
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131 else |
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132 system_fcn_file = 0; |
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133 } |
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134 |
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135 bool |
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136 octave_user_function::takes_varargs (void) const |
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137 { |
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138 return (param_list && param_list->takes_varargs ()); |
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139 } |
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140 |
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5848
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141 bool |
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142 octave_user_function::takes_var_return (void) const |
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2974
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143 { |
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144 return (ret_list && ret_list->takes_varargs ()); |
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2974
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145 } |
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146 |
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147 octave_value_list |
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148 octave_user_function::octave_all_va_args (void) |
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149 { |
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150 octave_value_list retval; |
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151 |
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3178
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152 int n = num_args_passed - num_named_args; |
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153 |
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3178
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154 if (n > 0) |
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155 { |
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156 retval.resize (n); |
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157 |
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158 int k = 0; |
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159 for (int i = num_named_args; i < num_args_passed; i++) |
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160 retval(k++) = args_passed(i); |
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161 } |
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162 |
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163 return retval; |
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164 } |
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165 |
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166 // For unwind protect. |
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167 |
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168 static void |
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169 pop_symbol_table_context (void *table) |
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170 { |
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171 symbol_table *tmp = static_cast<symbol_table *> (table); |
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172 tmp->pop_context (); |
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173 } |
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174 |
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175 static void |
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176 clear_symbol_table (void *table) |
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177 { |
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178 symbol_table *tmp = static_cast<symbol_table *> (table); |
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4239
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179 tmp->clear (); |
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180 } |
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181 |
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182 static void |
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3239
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183 clear_param_list (void *lst) |
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184 { |
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185 tree_parameter_list *tmp = static_cast<tree_parameter_list *> (lst); |
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186 |
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187 if (tmp) |
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4219
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188 tmp->undefine (); |
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3239
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189 } |
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190 |
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191 static void |
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3875
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192 restore_args_passed (void *fcn) |
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3239
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193 { |
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194 octave_user_function *tmp = static_cast<octave_user_function *> (fcn); |
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195 |
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196 if (tmp) |
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3875
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197 tmp->restore_args_passed (); |
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198 } |
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199 |
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200 static void |
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201 unprotect_function (void *sr_arg) |
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202 { |
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203 symbol_record *sr = static_cast<symbol_record *> (sr_arg); |
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204 sr->unprotect (); |
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205 } |
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206 |
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207 octave_value_list |
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4247
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208 octave_user_function::subsref (const std::string& type, |
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4219
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209 const std::list<octave_value_list>& idx, |
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3933
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210 int nargout) |
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211 { |
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212 octave_value_list retval; |
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213 |
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214 switch (type[0]) |
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215 { |
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216 case '(': |
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5154
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217 { |
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5155
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218 int tmp_nargout = (type.length () > 1 && nargout == 0) ? 1 : nargout; |
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5154
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219 |
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220 retval = do_multi_index_op (tmp_nargout, idx.front ()); |
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221 } |
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3933
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222 break; |
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223 |
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224 case '{': |
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225 case '.': |
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226 { |
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227 std::string nm = type_name (); |
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228 error ("%s cannot be indexed with %c", nm.c_str (), type[0]); |
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229 } |
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230 break; |
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231 |
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232 default: |
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233 panic_impossible (); |
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234 } |
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235 |
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5775
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236 // FIXME -- perhaps there should be an |
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4059
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237 // octave_value_list::next_subsref member function? See also |
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238 // octave_builtin::subsref. |
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3933
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239 |
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4219
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240 if (idx.size () > 1) |
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4994
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241 retval = retval(0).next_subsref (nargout, type, idx); |
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4059
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242 |
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243 return retval; |
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3933
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244 } |
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245 |
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246 octave_value_list |
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3544
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247 octave_user_function::do_multi_index_op (int nargout, |
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248 const octave_value_list& args) |
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2974
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249 { |
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250 octave_value_list retval; |
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251 |
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252 if (error_state) |
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253 return retval; |
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254 |
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255 if (! cmd_list) |
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256 return retval; |
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257 |
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258 int nargin = args.length (); |
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259 |
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4987
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260 unwind_protect::begin_frame ("user_func_eval"); |
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2974
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261 |
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262 unwind_protect_int (call_depth); |
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263 call_depth++; |
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264 |
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3131
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265 if (call_depth > Vmax_recursion_depth) |
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266 { |
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267 ::error ("max_recursion_limit exceeded"); |
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4987
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268 unwind_protect::run_frame ("user_func_eval"); |
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3131
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269 return retval; |
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270 } |
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271 |
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2974
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272 if (symtab_entry && ! symtab_entry->is_read_only ()) |
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273 { |
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274 symtab_entry->protect (); |
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2985
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275 unwind_protect::add (unprotect_function, symtab_entry); |
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2974
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276 } |
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277 |
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278 if (call_depth > 1) |
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279 { |
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280 sym_tab->push_context (); |
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2985
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281 unwind_protect::add (pop_symbol_table_context, sym_tab); |
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2974
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282 } |
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283 |
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4929
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284 install_automatic_vars (); |
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285 |
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2974
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286 // Force symbols to be undefined again when this function exits. |
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287 |
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2985
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288 unwind_protect::add (clear_symbol_table, sym_tab); |
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2974
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289 |
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290 // Save old and set current symbol table context, for |
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291 // eval_undefined_error(). |
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292 |
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4245
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293 unwind_protect_ptr (curr_caller_sym_tab); |
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294 curr_caller_sym_tab = curr_sym_tab; |
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295 |
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2974
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296 unwind_protect_ptr (curr_sym_tab); |
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297 curr_sym_tab = sym_tab; |
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298 |
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4975
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299 unwind_protect_ptr (curr_caller_statement); |
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5743
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300 curr_caller_statement = curr_statement; |
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4975
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301 |
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5743
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302 octave_call_stack::push (this); |
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303 |
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304 unwind_protect::add (octave_call_stack::unwind_pop, 0); |
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2974
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305 |
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6149
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306 if (! (is_nested_function () || is_inline_function ())) |
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4238
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307 { |
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308 unwind_protect_ptr (curr_parent_function); |
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309 curr_parent_function = this; |
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310 } |
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311 |
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3875
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312 // Save and restore args passed for recursive calls. |
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2974
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313 |
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3875
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314 save_args_passed (args); |
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3239
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315 |
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3875
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316 unwind_protect::add (::restore_args_passed, this); |
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3239
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317 |
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2974
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318 string_vector arg_names = args.name_tags (); |
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319 |
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320 unwind_protect_int (num_args_passed); |
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321 num_args_passed = nargin; |
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322 |
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323 if (param_list && ! param_list->varargs_only ()) |
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324 { |
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325 param_list->define_from_arg_vector (args); |
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326 if (error_state) |
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327 goto abort; |
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328 } |
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329 |
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3239
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330 // Force parameter list to be undefined when this function exits. |
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331 // Doing so decrements the reference counts on the values of local |
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332 // variables that are also named function parameters. |
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333 |
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334 unwind_protect::add (clear_param_list, param_list); |
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335 |
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336 // Force return list to be undefined when this function exits. |
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337 // Doing so decrements the reference counts on the values of local |
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338 // variables that are also named values returned by this function. |
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339 |
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340 unwind_protect::add (clear_param_list, ret_list); |
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341 |
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2974
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342 // The following code is in a separate scope to avoid warnings from |
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343 // G++ about `goto abort' crossing the initialization of some |
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344 // variables. |
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345 |
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346 { |
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3974
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347 bind_automatic_vars (arg_names, nargin, nargout, octave_all_va_args ()); |
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2974
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348 |
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349 bool echo_commands = (Vecho_executing_commands & ECHO_FUNCTIONS); |
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350 |
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351 if (echo_commands) |
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352 print_code_function_header (); |
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353 |
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354 // Evaluate the commands that make up the function. |
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355 |
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3489
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356 unwind_protect_bool (evaluating_function_body); |
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357 evaluating_function_body = true; |
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358 |
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5856
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359 cmd_list->eval (); |
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2974
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360 |
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361 if (echo_commands) |
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362 print_code_function_trailer (); |
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363 |
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4207
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364 if (tree_return_command::returning) |
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365 tree_return_command::returning = 0; |
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2974
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366 |
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4207
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367 if (tree_break_command::breaking) |
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368 tree_break_command::breaking--; |
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2974
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369 |
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370 if (error_state) |
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371 { |
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372 traceback_error (); |
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373 goto abort; |
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374 } |
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375 |
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376 // Copy return values out. |
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377 |
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378 if (ret_list) |
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3871
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379 { |
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4748
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380 ret_list->initialize_undefined_elements (my_name, nargout, Matrix ()); |
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3871
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381 |
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5848
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382 Cell varargout; |
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383 |
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384 symbol_record *sr = sym_tab->lookup ("varargout"); |
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385 |
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386 if (sr && sr->is_variable ()) |
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387 { |
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388 octave_value v = sr->def (); |
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3974
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389 |
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5848
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390 varargout = v.cell_value (); |
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391 |
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392 if (error_state) |
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393 error ("expecting varargout to be a cell array object"); |
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394 } |
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395 |
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396 if (! error_state) |
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397 retval = ret_list->convert_to_const_vector (varargout); |
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3871
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398 } |
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2974
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399 } |
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400 |
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401 abort: |
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4987
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402 unwind_protect::run_frame ("user_func_eval"); |
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2974
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403 |
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404 return retval; |
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405 } |
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406 |
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407 void |
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4346
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408 octave_user_function::traceback_error (void) const |
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2974
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409 { |
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410 if (error_state >= 0) |
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411 error_state = -1; |
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412 |
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4748
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413 if (my_name.empty ()) |
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2974
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414 { |
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415 if (file_name.empty ()) |
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416 ::error ("called from `?unknown?'"); |
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417 else |
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418 ::error ("called from file `%s'", file_name.c_str ()); |
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419 } |
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420 else |
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421 { |
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422 if (file_name.empty ()) |
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4748
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423 ::error ("called from `%s'", my_name.c_str ()); |
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2974
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424 else |
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425 ::error ("called from `%s' in file `%s'", |
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4748
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426 my_name.c_str (), file_name.c_str ()); |
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2974
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427 } |
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428 } |
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429 |
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430 void |
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431 octave_user_function::accept (tree_walker& tw) |
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432 { |
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433 tw.visit_octave_user_function (*this); |
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434 } |
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435 |
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436 void |
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3933
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437 octave_user_function::print_symtab_info (std::ostream& os) const |
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438 { |
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439 if (sym_tab) |
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440 sym_tab->print_info (os); |
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441 else |
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4748
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442 warning ("%s: no symbol table info!", my_name.c_str ()); |
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3933
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443 } |
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444 |
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445 void |
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2974
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446 octave_user_function::print_code_function_header (void) |
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447 { |
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5794
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448 tree_print_code tpc (octave_stdout, VPS4); |
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2974
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449 |
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450 tpc.visit_octave_user_function_header (*this); |
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451 } |
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452 |
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453 void |
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454 octave_user_function::print_code_function_trailer (void) |
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455 { |
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5794
|
456 tree_print_code tpc (octave_stdout, VPS4); |
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2974
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457 |
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458 tpc.visit_octave_user_function_trailer (*this); |
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459 } |
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460 |
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461 void |
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462 octave_user_function::install_automatic_vars (void) |
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463 { |
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4645
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464 if (sym_tab) |
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465 { |
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466 argn_sr = sym_tab->lookup ("argn", true); |
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4700
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467 nargin_sr = sym_tab->lookup ("__nargin__", true); |
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468 nargout_sr = sym_tab->lookup ("__nargout__", true); |
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3974
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469 |
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4645
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470 if (takes_varargs ()) |
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4929
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471 varargin_sr = sym_tab->lookup ("varargin", true); |
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4645
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472 } |
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2974
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473 } |
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474 |
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475 void |
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476 octave_user_function::bind_automatic_vars |
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3974
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477 (const string_vector& arg_names, int nargin, int nargout, |
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478 const octave_value_list& va_args) |
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2974
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479 { |
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480 if (! arg_names.empty ()) |
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481 argn_sr->define (arg_names); |
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482 |
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4233
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483 nargin_sr->define (nargin); |
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484 nargout_sr->define (nargout); |
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3974
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485 |
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486 if (takes_varargs ()) |
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487 { |
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488 int n = va_args.length (); |
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489 |
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490 Cell varargin (1, n); |
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491 |
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492 for (int i = 0; i < n; i++) |
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493 varargin(0,i) = va_args(i); |
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494 |
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495 varargin_sr->define (varargin); |
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496 } |
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2974
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497 } |
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498 |
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4700
|
499 DEFUN (nargin, args, , |
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500 "-*- texinfo -*-\n\ |
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501 @deftypefn {Built-in Function} {} nargin ()\n\ |
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502 @deftypefnx {Built-in Function} {} nargin (@var{fcn_name})\n\ |
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503 Within a function, return the number of arguments passed to the function.\n\ |
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504 At the top level, return the number of command line arguments passed to\n\ |
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505 Octave. If called with the optional argument @var{fcn_name}, return the\n\ |
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506 maximum number of arguments the named function can accept, or -1 if the\n\ |
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507 function accepts a variable number of arguments.\n\ |
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5642
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508 @seealso{nargout, varargin, varargout}\n\ |
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4700
|
509 @end deftypefn") |
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510 { |
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511 octave_value retval; |
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512 |
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513 int nargin = args.length (); |
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514 |
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515 if (nargin == 1) |
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516 { |
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517 std::string fname = args(0).string_value (); |
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518 |
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519 if (! error_state) |
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520 { |
|
4930
|
521 octave_value fcn_val = lookup_user_function (fname); |
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|
522 |
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523 octave_user_function *fcn = fcn_val.user_function_value (true); |
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4700
|
524 |
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|
525 if (fcn) |
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|
526 { |
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|
527 if (fcn->takes_varargs ()) |
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528 retval = -1; |
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529 else |
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|
530 { |
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|
531 tree_parameter_list *param_list = fcn->parameter_list (); |
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|
532 |
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533 retval = param_list ? param_list->length () : 0; |
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|
534 } |
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535 } |
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536 else |
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537 error ("nargin: invalid function"); |
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|
538 } |
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|
539 else |
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540 error ("nargin: expecting string as first argument"); |
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|
541 } |
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|
542 else if (nargin == 0) |
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|
543 { |
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544 symbol_record *sr = curr_sym_tab->lookup ("__nargin__"); |
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|
545 |
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|
546 retval = sr ? sr->def () : 0; |
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|
547 } |
|
|
548 else |
|
5823
|
549 print_usage (); |
|
4700
|
550 |
|
|
551 return retval; |
|
|
552 } |
|
|
553 |
|
|
554 DEFUN (nargout, args, , |
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|
555 "-*- texinfo -*-\n\ |
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|
556 @deftypefn {Built-in Function} {} nargout ()\n\ |
|
|
557 @deftypefnx {Built-in Function} {} nargout (@var{fcn_name})\n\ |
|
|
558 Within a function, return the number of values the caller expects to\n\ |
|
|
559 receive. If called with the optional argument @var{fcn_name}, return the\n\ |
|
|
560 maximum number of values the named function can produce, or -1 if the\n\ |
|
|
561 function can produce a variable number of values.\n\ |
|
|
562 \n\ |
|
|
563 For example,\n\ |
|
|
564 \n\ |
|
|
565 @example\n\ |
|
|
566 f ()\n\ |
|
|
567 @end example\n\ |
|
|
568 \n\ |
|
|
569 @noindent\n\ |
|
4704
|
570 will cause @code{nargout} to return 0 inside the function @code{f} and\n\ |
|
4700
|
571 \n\ |
|
|
572 @example\n\ |
|
|
573 [s, t] = f ()\n\ |
|
|
574 @end example\n\ |
|
|
575 \n\ |
|
|
576 @noindent\n\ |
|
|
577 will cause @code{nargout} to return 2 inside the function\n\ |
|
|
578 @code{f}.\n\ |
|
|
579 \n\ |
|
|
580 At the top level, @code{nargout} is undefined.\n\ |
|
5642
|
581 @seealso{nargin, varargin, varargout}\n\ |
|
4700
|
582 @end deftypefn") |
|
|
583 { |
|
|
584 octave_value retval; |
|
|
585 |
|
|
586 int nargin = args.length (); |
|
|
587 |
|
|
588 if (nargin == 1) |
|
|
589 { |
|
|
590 std::string fname = args(0).string_value (); |
|
|
591 |
|
|
592 if (! error_state) |
|
|
593 { |
|
4930
|
594 octave_value fcn_val = lookup_user_function (fname); |
|
|
595 |
|
|
596 octave_user_function *fcn = fcn_val.user_function_value (true); |
|
4700
|
597 |
|
|
598 if (fcn) |
|
|
599 { |
|
|
600 if (fcn->takes_var_return ()) |
|
|
601 retval = -1; |
|
|
602 else |
|
|
603 { |
|
|
604 tree_parameter_list *ret_list = fcn->return_list (); |
|
|
605 |
|
|
606 retval = ret_list ? ret_list->length () : 0; |
|
|
607 } |
|
|
608 } |
|
|
609 else |
|
|
610 error ("nargout: invalid function"); |
|
|
611 } |
|
|
612 else |
|
|
613 error ("nargout: expecting string as first argument"); |
|
|
614 } |
|
|
615 else if (nargin == 0) |
|
|
616 { |
|
|
617 if (! at_top_level ()) |
|
|
618 { |
|
|
619 symbol_record *sr = curr_sym_tab->lookup ("__nargout__"); |
|
|
620 |
|
|
621 retval = sr ? sr->def () : 0; |
|
|
622 } |
|
|
623 else |
|
|
624 error ("nargout: invalid call at top level"); |
|
|
625 } |
|
|
626 else |
|
5823
|
627 print_usage (); |
|
4700
|
628 |
|
|
629 return retval; |
|
|
630 } |
|
|
631 |
|
5794
|
632 DEFUN (max_recursion_depth, args, nargout, |
|
|
633 "-*- texinfo -*-\n\ |
|
|
634 @deftypefn {Built-in Function} {@var{val} =} max_recursion_depth ()\n\ |
|
|
635 @deftypefnx {Built-in Function} {@var{old_val} =} max_recursion_depth (@var{new_val})\n\ |
|
|
636 Query or set the internal limit on the number of times a function may\n\ |
|
|
637 be called recursively. If the limit is exceeded, an error message is\n\ |
|
|
638 printed and control returns to the top level.\n\ |
|
|
639 @end deftypefn") |
|
3131
|
640 { |
|
5794
|
641 return SET_INTERNAL_VARIABLE (max_recursion_depth); |
|
2974
|
642 } |
|
|
643 |
|
|
644 /* |
|
|
645 ;;; Local Variables: *** |
|
|
646 ;;; mode: C++ *** |
|
|
647 ;;; End: *** |
|
|
648 */ |
