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annotate src/pt-stmt.h @ 7552:6070c3bd69c4

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Arbitrary call stack access for external debuggers changeset
author ryanru@PrinceHumperdinck
date Tue, 04 Mar 2008 17:01:05 -0500
parents 745a8299c2b5
children 2dee19385d32
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1 /*
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2
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3 Copyright (C) 1996, 1997, 2000, 2001, 2002, 2004, 2005, 2006, 2007
a1dbe9d80eee [project @ 2007-10-12 21:27:11 by jwe]
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4 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 3 of the License, or (at your
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11 option) any 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, see
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20 <http://www.gnu.org/licenses/>.
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21
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22 */
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23
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24 #if !defined (octave_tree_stmt_h)
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25 #define octave_tree_stmt_h 1
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26
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27 class octave_value_list;
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28
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29 class tree_command;
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30 class tree_expression;
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31
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32 class tree_walker;
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33
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34 #include <deque>
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35
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36 #include "base-list.h"
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37 #include "comment-list.h"
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38 #include "symtab.h"
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39
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40 // A statement is either a command to execute or an expression to
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41 // evaluate.
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42
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43 class
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44 tree_statement
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45 {
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46 public:
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47
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48 tree_statement (void)
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49 : cmd (0), expr (0), comm (0), print_flag (true) { }
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50
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51 tree_statement (tree_command *c, octave_comment_list *cl)
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52 : cmd (c), expr (0), comm (cl), print_flag (true) { }
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53
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54 tree_statement (tree_expression *e, octave_comment_list *cl)
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55 : cmd (0), expr (e), comm (cl), print_flag (true) { }
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56
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57 ~tree_statement (void);
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58
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59 void set_print_flag (bool print) { print_flag = print; }
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60
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61 bool is_command (void) { return cmd != 0; }
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62
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63 bool is_expression (void) { return expr != 0; }
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64
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65 int line (void);
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66 int column (void);
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67
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68 void maybe_echo_code (bool in_function_body);
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69
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70 bool print_result (void) { return print_flag; }
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71
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72 tree_command *command (void) { return cmd; }
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73
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74 octave_value_list eval (bool silent, int nargout, bool in_function_body);
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75
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76 tree_expression *expression (void) { return expr; }
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77
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78 octave_comment_list *comment_text (void) { return comm; }
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79
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80 // Allow modification of this statement. Note that there is no
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81 // checking. If you use these, are you sure you knwo what you are
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82 // doing?
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83
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84 void set_command (tree_command *c) { cmd = c; }
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85
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86 void set_expression (tree_expression *e) { expr = e; }
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87
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88 tree_statement *dup (symbol_table::scope_id scope);
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89
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90 void accept (tree_walker& tw);
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91
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92 private:
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93
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94 // Only one of cmd or expr can be valid at once.
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95
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96 // Command to execute.
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97 tree_command *cmd;
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98
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99 // Expression to evaluate.
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100 tree_expression *expr;
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101
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102 // Comment associated with this statement.
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103 octave_comment_list *comm;
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104
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105 // Print result of eval for this command?
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106 bool print_flag;
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107
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108 // No copying!
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109 tree_statement (const tree_statement&);
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110
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111 tree_statement& operator = (const tree_statement&);
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112 };
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113
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114 // A list of statements to evaluate.
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115
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116 class
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117 tree_statement_list : public octave_base_list<tree_statement *>
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118 {
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119 public:
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120
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121 tree_statement_list (void)
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122 : function_body (false) { }
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123
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124 tree_statement_list (tree_statement *s)
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125 : function_body (false) { append (s); }
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126
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127 ~tree_statement_list (void)
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128 {
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129 while (! empty ())
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130 {
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131 iterator p = begin ();
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132 delete *p;
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133 erase (p);
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134 }
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135 }
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136
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137 void mark_as_function_body (void) { function_body = true; }
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138
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139 octave_value_list eval (bool silent = false, int nargout = 0);
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140
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141 int set_breakpoint (int line);
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142
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143 void delete_breakpoint (int line);
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144
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145 octave_value_list list_breakpoints (void);
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146
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147 tree_statement_list *dup (symbol_table::scope_id scope);
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148
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149 void accept (tree_walker& tw);
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150
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151 private:
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152
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153 // Does this list of statements make up the body of a function?
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154 bool function_body;
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155
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156 // No copying!
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157
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158 tree_statement_list (const tree_statement_list&);
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159
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160 tree_statement_list& operator = (const tree_statement_list&);
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161 };
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162
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163 class tree_statement_stack
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164 {
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165 protected:
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166
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167 tree_statement_stack (void) : tss () { }
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168
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169 public:
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170
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171 typedef std::deque<tree_statement *>::iterator iterator ;
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172
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173 static bool instance_ok (void)
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174 {
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175 bool retval = true;
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176
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177 if (! instance)
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178 instance = new tree_statement_stack ();
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179
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180 if (! instance)
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181 {
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182 ::error ("unable to create stmt stack object!");
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183
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184 retval = false;
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185 }
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186
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187 return retval;
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188 }
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189
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190 // Current statement (top of stack).
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191 static tree_statement *current (void) { return top (); }
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192
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193 static int current_line (void)
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194 {
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195 tree_statement *s = current ();
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196 return s ? s->line () : -1;
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197 }
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198
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199 static int current_column (void)
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200 {
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201 tree_statement *s = current ();
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202 return s ? s->column () : -1;
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203 }
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204
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205 // Statement at position N on the call stack (N == 0 is current).
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206 static tree_statement *element (size_t n)
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207 {
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208 return instance_ok () ? instance->do_element (n) : 0;
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209 }
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210
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211 // Caller statement
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212 static tree_statement *caller (void) { return element (1); }
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213
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214 static void push (tree_statement *f)
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215 {
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216 if (instance_ok ())
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217 instance->do_push (f);
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218 }
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219
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220 static tree_statement *top (void)
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221 {
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222 return instance_ok () ? instance->do_top (): 0;
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223 }
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224
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225 static void pop (void)
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226 {
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227 if (instance_ok ())
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228 instance->do_pop ();
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229 }
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230
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231 // A function for popping the top of the call stack that is suitable
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232 // for use as an unwind_protect handler.
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233 static void unwind_pop (void *) { pop (); }
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234
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235 static void clear (void)
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236 {
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237 if (instance_ok ())
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238 instance->do_clear ();
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239 }
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240
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241 private:
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242
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243 // The current stmt stack.
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244 std::deque<tree_statement *> tss;
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245
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246 static tree_statement_stack *instance;
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247
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248 tree_statement *do_element (size_t n) { return tss.size () > n ? tss[n] : 0; }
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249
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250 void do_push (tree_statement *f) { tss.push_front (f); }
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251
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252 tree_statement *do_top (void) { return tss.empty () ? 0 : tss.front (); }
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253
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254 void do_pop (void)
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255 {
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256 if (! tss.empty ())
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257 tss.pop_front ();
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258 }
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259
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260 void do_clear (void) { tss.clear (); }
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261 };
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262
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263 #endif
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264
20f5cec4f11c [project @ 1997-05-16 03:29:26 by jwe]
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265 /*
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266 ;;; Local Variables: ***
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267 ;;; mode: C++ ***
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268 ;;; End: ***
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269 */