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1741
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1 // tree-fcn.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1992, 1993, 1994, 1995 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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21 |
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22 */ |
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23 |
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24 #if defined (__GNUG__) |
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25 #pragma implementation |
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26 #endif |
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27 |
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28 #ifdef HAVE_CONFIG_H |
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29 #include <config.h> |
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30 #endif |
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31 |
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32 #include <iostream.h> |
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33 #include <strstream.h> |
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34 |
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35 #include "defun.h" |
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36 #include "error.h" |
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37 #include "gripes.h" |
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38 #include "help.h" |
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39 #include "pager.h" |
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40 #include "symtab.h" |
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41 #include "toplev.h" |
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42 #include "pt-const.h" |
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43 #include "pt-exp.h" |
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44 #include "pt-fcn.h" |
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45 #include "pt-misc.h" |
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46 #include "unwind-prot.h" |
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47 #include "user-prefs.h" |
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48 #include "utils.h" |
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49 #include "variables.h" |
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50 |
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51 // Nonzero means we're returning from a function. |
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52 extern int returning; |
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53 |
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54 // Nonzero means we're breaking out of a loop or function body. |
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55 extern int breaking; |
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56 |
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57 // User defined functions. |
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58 |
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59 void |
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60 tree_function::install_nargin_and_nargout (void) |
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61 { |
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62 nargin_sr = sym_tab->lookup ("nargin", 1, 0); |
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63 nargout_sr = sym_tab->lookup ("nargout", 1, 0); |
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64 } |
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65 |
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66 void |
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67 tree_function::bind_nargin_and_nargout (int nargin, int nargout) |
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68 { |
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69 tree_constant *tmp; |
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70 |
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71 tmp = new tree_constant (nargin); |
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72 nargin_sr->define (tmp); |
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73 |
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74 tmp = new tree_constant (nargout); |
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75 nargout_sr->define (tmp); |
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76 } |
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77 |
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78 tree_function::~tree_function (void) |
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79 { |
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80 delete param_list; |
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81 delete ret_list; |
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82 delete sym_tab; |
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83 delete cmd_list; |
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84 delete [] file_name; |
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85 delete [] fcn_name; |
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86 delete vr_list; |
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87 } |
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88 |
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89 #if 0 |
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90 tree_function * |
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91 tree_function::define (tree statement_list *t) |
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92 { |
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93 cmd_list = t; |
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94 return this; |
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95 } |
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96 #endif |
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97 |
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98 tree_function * |
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99 tree_function::define_param_list (tree_parameter_list *t) |
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100 { |
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101 param_list = t; |
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102 |
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103 if (param_list) |
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104 { |
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105 num_named_args = param_list->length (); |
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106 curr_va_arg_number = num_named_args; |
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107 } |
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108 |
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109 return this; |
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110 } |
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111 |
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112 tree_function * |
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113 tree_function::define_ret_list (tree_parameter_list *t) |
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114 { |
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115 ret_list = t; |
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116 |
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117 if (ret_list && ret_list->takes_varargs ()) |
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118 vr_list = new tree_va_return_list; |
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119 |
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120 return this; |
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121 } |
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122 |
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123 void |
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124 tree_function::stash_fcn_file_name (void) |
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125 { |
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126 delete [] file_name; |
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127 file_name = fcn_name ? fcn_file_in_path (fcn_name) : 0; |
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128 } |
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129 |
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130 void |
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131 tree_function::mark_as_system_fcn_file (void) |
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132 { |
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133 if (file_name) |
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134 { |
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135 // We really should stash the whole path to the file we found, |
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136 // when we looked it up, to avoid possible race conditions... |
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137 // XXX FIXME XXX |
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138 // |
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139 // We probably also don't need to get the library directory |
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140 // every time, but since this function is only called when the |
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141 // function file is parsed, it probably doesn't matter that |
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142 // much. |
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143 |
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144 char *ff_name = fcn_file_in_path (file_name); |
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145 |
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146 char *system_dir = octave_fcn_file_dir (); |
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147 int len = strlen (system_dir); |
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148 |
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149 if (strncmp (system_dir, ff_name, len) == 0) |
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150 system_fcn_file = 1; |
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151 |
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152 delete [] ff_name; |
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153 } |
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154 else |
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155 system_fcn_file = 0; |
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156 } |
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157 |
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158 int |
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159 tree_function::takes_varargs (void) const |
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160 { |
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161 return (param_list && param_list->takes_varargs ()); |
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162 } |
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163 |
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164 tree_constant |
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165 tree_function::octave_va_arg (void) |
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166 { |
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167 tree_constant retval; |
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168 |
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169 if (curr_va_arg_number < num_args_passed) |
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170 retval = args_passed (curr_va_arg_number++); |
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171 else |
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172 ::error ("va_arg: error getting arg number %d -- only %d provided", |
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173 curr_va_arg_number + 1, num_args_passed); |
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174 |
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175 return retval; |
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176 } |
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177 |
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178 Octave_object |
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179 tree_function::octave_all_va_args (void) |
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180 { |
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181 Octave_object retval; |
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182 |
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183 retval.resize (num_args_passed - num_named_args); |
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184 |
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185 int k = 0; |
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186 for (int i = num_named_args; i < num_args_passed; i++) |
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187 retval(k++) = args_passed(i); |
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188 |
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189 return retval; |
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190 } |
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191 |
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192 int |
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193 tree_function::takes_var_return (void) const |
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194 { |
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195 return (ret_list && ret_list->takes_varargs ()); |
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196 } |
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197 |
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198 void |
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199 tree_function::octave_vr_val (const tree_constant& val) |
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200 { |
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201 assert (vr_list); |
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202 |
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203 vr_list->append (val); |
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204 } |
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205 |
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206 void |
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207 tree_function::stash_function_name (char *s) |
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208 { |
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209 delete [] fcn_name; |
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210 fcn_name = strsave (s); |
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211 } |
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212 |
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213 tree_constant |
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214 tree_function::eval (int print) |
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215 { |
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216 tree_constant retval; |
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217 |
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218 if (error_state || ! cmd_list) |
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219 return retval; |
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220 |
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221 Octave_object tmp_args; |
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222 Octave_object tmp = eval (print, 0, tmp_args); |
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223 |
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224 if (! error_state && tmp.length () > 0) |
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225 retval = tmp(0); |
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226 |
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227 return retval; |
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228 } |
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229 |
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230 // For unwind protect. |
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231 |
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232 static void |
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233 pop_symbol_table_context (void *table) |
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234 { |
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235 symbol_table *tmp = (symbol_table *) table; |
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236 tmp->pop_context (); |
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237 } |
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238 |
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239 static void |
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240 delete_vr_list (void *list) |
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241 { |
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242 tree_va_return_list *tmp = (tree_va_return_list *) list; |
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243 tmp->clear (); |
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244 delete tmp; |
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245 } |
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246 |
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247 static void |
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248 clear_symbol_table (void *table) |
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249 { |
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250 symbol_table *tmp = (symbol_table *) table; |
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251 tmp->clear (); |
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252 } |
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253 |
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254 Octave_object |
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255 tree_function::eval (int /* print */, int nargout, const Octave_object& args) |
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256 { |
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257 Octave_object retval; |
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258 |
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259 if (error_state) |
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260 return retval; |
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261 |
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262 if (! cmd_list) |
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263 return retval; |
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264 |
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265 int nargin = args.length (); |
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266 |
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267 begin_unwind_frame ("func_eval"); |
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268 |
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269 unwind_protect_int (call_depth); |
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270 call_depth++; |
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271 |
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272 if (call_depth > 1) |
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273 { |
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274 sym_tab->push_context (); |
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275 add_unwind_protect (pop_symbol_table_context, (void *) sym_tab); |
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276 |
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277 if (vr_list) |
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278 { |
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279 // Push new vr_list. |
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280 |
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281 unwind_protect_ptr (vr_list); |
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282 vr_list = new tree_va_return_list; |
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283 |
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284 // Clear and delete the new one before restoring the old |
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285 // one. |
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286 |
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287 add_unwind_protect (delete_vr_list, (void *) vr_list); |
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288 } |
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289 } |
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290 |
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291 if (vr_list) |
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292 vr_list->clear (); |
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293 |
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294 // Force symbols to be undefined again when this function exits. |
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295 |
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296 add_unwind_protect (clear_symbol_table, (void *) sym_tab); |
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297 |
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298 // Save old and set current symbol table context, for |
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299 // eval_undefined_error(). |
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300 |
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301 unwind_protect_ptr (curr_sym_tab); |
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302 curr_sym_tab = sym_tab; |
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303 |
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304 unwind_protect_ptr (curr_function); |
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305 curr_function = this; |
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306 |
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307 // unwind_protect_ptr (args_passed); |
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308 |
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309 args_passed = args; |
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310 |
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311 unwind_protect_int (num_args_passed); |
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312 num_args_passed = nargin; |
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313 |
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314 unwind_protect_int (num_named_args); |
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315 unwind_protect_int (curr_va_arg_number); |
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316 |
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317 if (param_list && ! param_list->varargs_only ()) |
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318 { |
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319 param_list->define_from_arg_vector (args); |
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320 if (error_state) |
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321 goto abort; |
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322 } |
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323 |
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324 // The following code is in a separate scope to avoid warnings from |
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325 // G++ about `goto abort' crossing the initialization of some |
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326 // variables. |
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327 |
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328 { |
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329 bind_nargin_and_nargout (nargin, nargout); |
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330 |
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331 int echo_commands |
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332 = (user_pref.echo_executing_commands & ECHO_FUNCTIONS); |
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333 |
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334 if (echo_commands) |
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335 print_code_function_header (); |
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336 |
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337 // Evaluate the commands that make up the function. |
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338 |
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339 int pf = ! user_pref.silent_functions; |
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340 tree_constant last_computed_value = cmd_list->eval (pf); |
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341 |
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342 if (echo_commands) |
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343 print_code_function_trailer (); |
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344 |
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345 if (returning) |
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346 returning = 0; |
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347 |
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348 if (breaking) |
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349 breaking--; |
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350 |
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351 if (error_state) |
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352 { |
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353 traceback_error (); |
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354 goto abort; |
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355 } |
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356 |
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357 // Copy return values out. |
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358 |
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359 if (ret_list) |
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360 { |
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361 if (nargout > 0 && user_pref.define_all_return_values) |
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362 { |
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363 tree_constant tmp = builtin_any_variable ("default_return_value"); |
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364 if (tmp.is_defined ()) |
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365 ret_list->initialize_undefined_elements (tmp); |
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366 } |
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367 |
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368 retval = ret_list->convert_to_const_vector (vr_list); |
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369 } |
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370 else if (user_pref.return_last_computed_value) |
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371 retval(0) = last_computed_value; |
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372 } |
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373 |
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374 abort: |
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375 run_unwind_frame ("func_eval"); |
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376 |
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377 return retval; |
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378 } |
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379 |
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380 void |
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381 tree_function::traceback_error (void) |
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382 { |
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383 if (error_state >= 0) |
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384 error_state = -1; |
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385 |
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386 if (fcn_name) |
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387 { |
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388 if (file_name) |
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389 ::error ("called from `%s' in file `%s'", fcn_name, file_name); |
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390 else |
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391 ::error ("called from `%s'", fcn_name); |
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392 } |
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393 else |
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394 { |
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395 if (file_name) |
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396 ::error ("called from file `%s'", file_name); |
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397 else |
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398 ::error ("called from `?unknown?'"); |
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399 } |
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400 } |
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401 |
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402 void |
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403 tree_function::print_code (ostream& os) |
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404 { |
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405 print_code_reset (); |
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406 |
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407 print_code_function_header (os); |
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408 |
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409 if (cmd_list) |
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410 { |
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411 increment_indent_level (); |
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412 cmd_list->print_code (os); |
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413 decrement_indent_level (); |
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414 } |
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415 |
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416 print_code_function_trailer (os); |
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417 } |
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418 |
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419 void |
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420 tree_function::print_code_function_header (void) |
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421 { |
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422 ostrstream output_buf; |
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423 print_code_function_header (output_buf); |
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424 output_buf << ends; |
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425 maybe_page_output (output_buf); |
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426 } |
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427 |
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428 void |
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429 tree_function::print_code_function_header (ostream& os) |
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430 { |
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431 print_code_indent (os); |
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432 |
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433 os << "function "; |
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434 |
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435 if (ret_list) |
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436 { |
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437 int len = ret_list->length (); |
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438 |
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439 if (len > 1) |
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440 os << "["; |
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441 |
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442 ret_list->print_code (os); |
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443 |
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444 if (len > 1) |
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445 os << "]"; |
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446 |
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447 os << " = "; |
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448 } |
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449 |
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450 os << (fcn_name ? fcn_name : "(null)") << " "; |
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451 |
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452 if (param_list) |
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453 { |
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454 int len = param_list->length (); |
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455 if (len > 0) |
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456 os << "("; |
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457 |
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458 param_list->print_code (os); |
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459 |
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460 if (len > 0) |
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461 { |
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462 os << ")"; |
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463 print_code_new_line (os); |
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464 } |
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465 } |
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466 else |
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467 { |
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468 os << "()"; |
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469 print_code_new_line (os); |
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470 } |
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471 } |
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472 |
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473 void |
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474 tree_function::print_code_function_trailer (void) |
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475 { |
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476 ostrstream output_buf; |
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477 print_code_function_trailer (output_buf); |
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478 output_buf << ends; |
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479 maybe_page_output (output_buf); |
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480 } |
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481 |
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482 void |
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483 tree_function::print_code_function_trailer (ostream& os) |
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484 { |
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485 print_code_indent (os); |
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486 |
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487 os << "endfunction"; |
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488 |
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489 print_code_new_line (os); |
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490 } |
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491 |
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492 DEFUN ("va_arg", Fva_arg, Sva_arg, 10, |
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493 "va_arg (): return next argument in a function that takes a\n\ |
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494 variable number of parameters") |
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495 { |
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496 Octave_object retval; |
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497 |
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498 int nargin = args.length (); |
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499 |
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500 if (nargin == 0) |
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501 { |
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502 if (curr_function) |
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503 { |
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504 if (curr_function->takes_varargs ()) |
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505 retval = curr_function->octave_va_arg (); |
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506 else |
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507 { |
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508 ::error ("va_arg only valid within function taking variable"); |
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509 ::error ("number of arguments"); |
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510 } |
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511 } |
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512 else |
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513 ::error ("va_arg only valid within function body"); |
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514 } |
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515 else |
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516 print_usage ("va_arg"); |
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517 |
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518 return retval; |
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519 } |
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520 |
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521 DEFUN ("va_start", Fva_start, Sva_start, 10, |
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522 "va_start (): reset the pointer to the list of optional arguments\n\ |
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523 to the beginning") |
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524 { |
|
|
525 Octave_object retval; |
|
|
526 |
|
|
527 int nargin = args.length (); |
|
|
528 |
|
|
529 if (nargin == 0) |
|
|
530 { |
|
|
531 if (curr_function) |
|
|
532 { |
|
|
533 if (curr_function->takes_varargs ()) |
|
|
534 curr_function->octave_va_start (); |
|
|
535 else |
|
|
536 { |
|
|
537 ::error ("va_start only valid within function taking variable"); |
|
|
538 ::error ("number of arguments"); |
|
|
539 } |
|
|
540 } |
|
|
541 else |
|
|
542 ::error ("va_start only valid within function body"); |
|
|
543 } |
|
|
544 else |
|
|
545 print_usage ("va_start"); |
|
|
546 |
|
|
547 return retval; |
|
|
548 } |
|
|
549 |
|
|
550 DEFUN ("vr_val", Fvr_val, Svr_val, 10, |
|
|
551 "vr_val (X): append X to the list of optional return values for a |
|
|
552 function that allows a variable number of return values") |
|
|
553 { |
|
|
554 Octave_object retval; |
|
|
555 |
|
|
556 int nargin = args.length (); |
|
|
557 |
|
|
558 if (nargin == 1) |
|
|
559 { |
|
|
560 if (curr_function) |
|
|
561 { |
|
|
562 if (curr_function->takes_var_return ()) |
|
|
563 curr_function->octave_vr_val (args(0)); |
|
|
564 else |
|
|
565 { |
|
|
566 ::error ("vr_val only valid within function declared to"); |
|
|
567 ::error ("produce a variable number of values"); |
|
|
568 } |
|
|
569 } |
|
|
570 else |
|
|
571 ::error ("vr_val only valid within function body"); |
|
|
572 } |
|
|
573 else |
|
|
574 print_usage ("vr_val"); |
|
|
575 |
|
|
576 return retval; |
|
|
577 } |
|
|
578 |
|
|
579 /* |
|
|
580 ;;; Local Variables: *** |
|
|
581 ;;; mode: C++ *** |
|
|
582 ;;; page-delimiter: "^/\\*" *** |
|
|
583 ;;; End: *** |
|
|
584 */ |
