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annotate examples/mpp/mpp.h @ 21:1c9dac05d040

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Add lint-style FALLTHROUGH annotations to fallthrough cases. (in the parse engine and thus the output code) Document this, because the old output causes warnings with gcc10.
author David A. Holland
date Mon, 13 Jun 2022 00:04:38 -0400
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1 /*
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2 * AnaGram, a System for Syntax Directed Programming
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3 * C Macro preprocessor
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4 * Global Definitions
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5 *
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6 * Copyright 1993 Parsifal Software. All Rights Reserved.
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7 *
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8 * This software is provided 'as-is', without any express or implied
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9 * warranty. In no event will the authors be held liable for any damages
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10 * arising from the use of this software.
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11 *
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12 * Permission is granted to anyone to use this software for any purpose,
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13 * including commercial applications, and to alter it and redistribute it
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14 * freely, subject to the following restrictions:
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15 *
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16 * 1. The origin of this software must not be misrepresented; you must not
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17 * claim that you wrote the original software. If you use this software
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18 * in a product, an acknowledgment in the product documentation would be
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19 * appreciated but is not required.
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20 * 2. Altered source versions must be plainly marked as such, and must not be
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21 * misrepresented as being the original software.
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22 * 3. This notice may not be removed or altered from any source distribution.
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23 */
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24
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25 #ifndef MPP_H
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26 #define MPP_H
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27
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28
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29 //#define NDEBUG
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30 #include "token.h"
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31 #include <charsink.h>
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32 #include <stack.h>
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33 #include <strdict.h>
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34 #include "ex.h"
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35
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36 #include "krc.h"
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37 //#include "jrc.h"
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38
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39 #define N_MACROS 500 // max number of macros
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40 #define N_SYMBOLS 5000 // size of token dictionary
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41
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42 enum symbol_type_enum {identifier, typedef_name};
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43
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44 struct macro_descriptor {
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45 unsigned name; // token dictionary index of name
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46 unsigned* arg_names; // pointer to list of parameter names
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47 unsigned n_args; // number of parameters
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48 token *body; // body of macro
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49 unsigned busy_flag : 1; // set when macro should not be expanded
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50 unsigned parens : 1; // set if macro defined with parens
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51 };
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52
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53 struct op_descriptor {
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54 const char *op;
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55 token_id id;
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56 };
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57
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58
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59 // Parser classes
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60
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61 // Expression evaluator
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62 // member functions are in EX.SYN
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63
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64 class expression_evaluator : public token_sink {
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65 ex_pcb_type pcb;
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66 public:
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67 expression_evaluator();
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68 friend token_sink& reset(expression_evaluator &);
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69 token_sink& operator << (token t);
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70 token_sink& operator << (token *tp);
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71 operator long();
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72 // friend int error(expression_evaluator &);
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73 };
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74
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75
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76 // C parser
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77 // Member Functions are in JRC.SYN or KRC.SYN
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78
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79 class c_parser: public token_sink {
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80 public:
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81 cc_pcb_type pcb;
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82 c_parser();
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83 ~c_parser();
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84 token_sink &operator << (token);
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85 token_sink& operator << (token *);
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86 // friend int error(c_parser &p);
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87 friend c_parser &reset(c_parser &);
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88 };
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89
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90
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91 // Global variables
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92 // Variables are defined in mpp.cpp
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93
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94 extern expression_evaluator condition;
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95 extern char default_path[];
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96 extern unsigned defined_value;
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97 extern int if_clause;
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98 extern macro_descriptor macro[];
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99 extern unsigned macro_id[];
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100 extern int n_macros;
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101 extern unsigned n_reserved_words;
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102 extern int nest_comments;
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103 extern unsigned one_value;
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104 extern stack<char *> paths;
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105 extern op_descriptor reserved_words[];
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106 extern string_accumulator sa;
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107 extern token_accumulator ta;
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108 extern token_sink *scanner_sink;
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109 extern string_dictionary td;
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110 extern unsigned token_handles[];
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111 extern unsigned zero_value;
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112
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113
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114 // Function declarations
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115
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116 token_id classify_token(char *); // ct.syn
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117 void expand_macro(token, unsigned); // asc.syn
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118 void expand_text(token *, int = 0, unsigned * = NULL); // asc.syn
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119 void scan_input(char *); // ts.syn
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120 void syntax_error(const char *); // ts.syn
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121
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122 #endif