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New evaluator and debugger derived from tree-walker class
author John W. Eaton <jwe@octave.org>
date Wed, 04 Feb 2009 00:47:53 -0500
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children 33783e94fb16
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8657:102e05821f93 8658:73c4516fae10
1 /*
2
3 Copyright (C) 2009 John W. Eaton
4
5 This file is part of Octave.
6
7 Octave is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the
9 Free Software Foundation; either version 3 of the License, or (at your
10 option) any later version.
11
12 Octave is distributed in the hope that it will be useful, but WITHOUT
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with Octave; see the file COPYING. If not, see
19 <http://www.gnu.org/licenses/>.
20
21 */
22
23 #if !defined (octave_tree_eval_h)
24 #define octave_tree_eval_h 1
25
26 #include <stack>
27 #include <string>
28
29 #include "comment-list.h"
30 #include "oct-obj.h"
31 #include "pt-walk.h"
32
33 class tree_expression;
34
35 // How to evaluate the code that the parse trees represent.
36
37 class
38 tree_evaluator : public tree_walker
39 {
40 public:
41
42 typedef void (*decl_elt_init_fcn) (tree_decl_elt&);
43
44 tree_evaluator (bool in_function_or_script_body_arg = false)
45 : in_function_or_script_body (in_function_or_script_body_arg) { }
46
47 ~tree_evaluator (void) { }
48
49 void reset (void)
50 {
51 in_function_or_script_body = false;
52 }
53
54 void visit_anon_fcn_handle (tree_anon_fcn_handle&);
55
56 void visit_argument_list (tree_argument_list&);
57
58 void visit_binary_expression (tree_binary_expression&);
59
60 void visit_break_command (tree_break_command&);
61
62 void visit_colon_expression (tree_colon_expression&);
63
64 void visit_continue_command (tree_continue_command&);
65
66 void visit_global_command (tree_global_command&);
67
68 void visit_static_command (tree_static_command&);
69
70 void visit_decl_elt (tree_decl_elt&);
71
72 void visit_decl_init_list (tree_decl_init_list&);
73
74 void visit_simple_for_command (tree_simple_for_command&);
75
76 void visit_complex_for_command (tree_complex_for_command&);
77
78 void visit_octave_user_script (octave_user_script&);
79
80 void visit_octave_user_function (octave_user_function&);
81
82 void visit_octave_user_function_header (octave_user_function&);
83
84 void visit_octave_user_function_trailer (octave_user_function&);
85
86 void visit_function_def (tree_function_def&);
87
88 void visit_identifier (tree_identifier&);
89
90 void visit_if_clause (tree_if_clause&);
91
92 void visit_if_command (tree_if_command&);
93
94 void visit_if_command_list (tree_if_command_list&);
95
96 void visit_index_expression (tree_index_expression&);
97
98 void visit_matrix (tree_matrix&);
99
100 void visit_cell (tree_cell&);
101
102 void visit_multi_assignment (tree_multi_assignment&);
103
104 void visit_no_op_command (tree_no_op_command&);
105
106 void visit_constant (tree_constant&);
107
108 void visit_fcn_handle (tree_fcn_handle&);
109
110 void visit_parameter_list (tree_parameter_list&);
111
112 void visit_postfix_expression (tree_postfix_expression&);
113
114 void visit_prefix_expression (tree_prefix_expression&);
115
116 void visit_return_command (tree_return_command&);
117
118 void visit_return_list (tree_return_list&);
119
120 void visit_simple_assignment (tree_simple_assignment&);
121
122 void visit_statement (tree_statement&);
123
124 void visit_statement_list (tree_statement_list&);
125
126 void visit_switch_case (tree_switch_case&);
127
128 void visit_switch_case_list (tree_switch_case_list&);
129
130 void visit_switch_command (tree_switch_command&);
131
132 void visit_try_catch_command (tree_try_catch_command&);
133
134 void visit_unwind_protect_command (tree_unwind_protect_command&);
135
136 void visit_while_command (tree_while_command&);
137
138 void visit_do_until_command (tree_do_until_command&);
139
140 static int debug_line (void) { return db_line; }
141
142 static int debug_column (void) { return db_column; }
143
144 // If > 0, stop executing at the (N-1)th stopping point, counting
145 // from the the current execution point in the current frame.
146 //
147 // If < 0, stop executing at the next possible stopping point.
148 static int dbstep_flag;
149
150 // The number of the stack frame we are currently debugging.
151 static size_t current_frame;
152
153 static bool debug_mode;
154
155 private:
156
157 bool in_function_or_script_body;
158
159 void do_decl_init_list (decl_elt_init_fcn fcn,
160 tree_decl_init_list *init_list);
161
162 void do_breakpoint (tree_statement& stmt) const;
163
164 void do_breakpoint (bool is_breakpoint, int l, int c,
165 bool is_end_of_fcn_or_script = false) const;
166
167 static int db_line;
168 static int db_column;
169
170 // No copying!
171
172 tree_evaluator (const tree_evaluator&);
173
174 tree_evaluator& operator = (const tree_evaluator&);
175 };
176
177 extern tree_evaluator *current_evaluator;
178
179 #endif
180
181 /*
182 ;;; Local Variables: ***
183 ;;; mode: C++ ***
184 ;;; End: ***
185 */