author | Mario de Sousa <msousa@fe.up.pt> |
Sun, 10 Jun 2012 21:47:15 +0100 | |
changeset 576 | 8368ec909825 |
parent 572 | c353bc67bf91 |
child 607 | be9ba3531afb |
permissions | -rwxr-xr-x |
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/* |
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* matiec - a compiler for the programming languages defined in IEC 61131-3 |
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* Copyright (C) 2003-2011 Mario de Sousa (msousa@fe.up.pt) |
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* Copyright (C) 2007-2011 Laurent Bessard and Edouard Tisserant |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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* |
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* |
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* This code is made available on the understanding that it will not be |
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* used in safety-critical situations without a full and competent review. |
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*/ |
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|
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/* |
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* An IEC 61131-3 compiler. |
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* |
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* Based on the |
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* FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10) |
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* |
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*/ |
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|
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/* |
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* Declaration of the Abstract Syntax data structure components |
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*/ |
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/* |
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* ABSYNTAX.H |
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* |
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* This generates the parse tree structure used to bind the components |
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* identified by Bison in the correct syntax order. At the end of the |
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* Bison analysis the tree is walked in a sequential fashion generating |
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* the relavent code. |
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*/ |
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#ifndef _ABSYNTAX_HH |
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#define _ABSYNTAX_HH |
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|
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#include <stdio.h> // required for NULL |
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#include <vector> |
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#include <string> |
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#include <stdint.h> // required for uint64_t, etc... |
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/* Determine, for the current platform, which data type (float, double or long double) uses 64 bits. */ |
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/* NOTE: We cant use sizeof() in pre-processor directives, so we have to do it another way... */ |
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/* CURIOSITY: We can use sizeof() and offsetof() inside static_assert() but: |
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* - this only allows us to make assertions, and not #define new macros |
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* - is only available in the C standard [ISO/IEC 9899:2011] and the C++ 0X draft standard [Becker 2008]. It is not available in C99. |
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* https://www.securecoding.cert.org/confluence/display/seccode/DCL03-C.+Use+a+static+assertion+to+test+the+value+of+a+constant+expression |
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* struct {int a, b, c, d} header_t; |
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* e.g.: static_assert(offsetof(struct header_t, c) == 8, "Compile time error message."); |
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*/ |
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#include <float.h> |
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#if (LDBL_MANT_DIG == 53) /* NOTE: 64 bit IEC559 real has 53 bits for mantissa! */ |
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#define long_double long double |
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#define real64_t long_double /* so we can later use #if (real64_t == long_double) directives in the code! */ |
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#elif ( DBL_MANT_DIG == 53) /* NOTE: 64 bit IEC559 real has 53 bits for mantissa! */ |
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#define real64_t double |
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#elif ( FLT_MANT_DIG == 53) /* NOTE: 64 bit IEC559 real has 53 bits for mantissa! */ |
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#define real64_t float |
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#else |
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#error Could not find a 64 bit floating point data type on this platform. Aborting... |
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#endif |
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/* Forward declaration of the visitor interface |
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* declared in the visitor.hh file |
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* We cannot include the visitor.hh file, as it will |
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* include this same file first, as it too requires references |
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* to the abstract syntax classes defined here. |
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*/ |
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class visitor_c; // forward declaration |
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class symbol_c; // forward declaration |
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/* The base class of all symbols */ |
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class symbol_c { |
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public: |
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/* |
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* Line number for the purposes of error checking. |
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* Annotated (inserted) by stage1_2 |
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*/ |
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int first_line; |
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int first_column; |
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const char *first_file; /* filename referenced by first line/column */ |
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long int first_order; /* relative order in which it is read by lexcial analyser */ |
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int last_line; |
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int last_column; |
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const char *last_file; /* filename referenced by last line/column */ |
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114 |
long int last_order; /* relative order in which it is read by lexcial analyser */ |
569
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115 |
|
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116 |
|
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117 |
/* |
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118 |
* Annotations produced during stage 3 |
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119 |
*/ |
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120 |
/*** Data type analysis ***/ |
417
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121 |
std::vector <symbol_c *> candidate_datatypes; /* All possible data types the expression/literal/etc. may take. Filled in stage3 by fill_candidate_datatypes_c class */ |
459
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122 |
/* Data type of the expression/literal/etc. Filled in stage3 by narrow_candidate_datatypes_c |
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123 |
* If set to NULL, it means it has not yet been evaluated. |
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124 |
* If it points to an object of type invalid_type_name_c, it means it is invalid. |
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125 |
* Otherwise, it points to an object of the apropriate data type (e.g. int_type_name_c, bool_type_name_c, ...) |
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|
126 |
*/ |
564
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parents:
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|
127 |
symbol_c *datatype; |
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|
128 |
|
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129 |
/*** constant folding ***/ |
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130 |
/* During stage 3 (semantic analysis/checking) we will be doing constant folding. |
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131 |
* That algorithm will anotate the abstract syntax tree with the result of operations |
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132 |
* on literals (i.e. 44 + 55 will store the result 99). |
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133 |
* Since the same source code (e.g. 1 + 0) may actually be a BOOL or an ANY_INT, |
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134 |
* or an ANY_BIT, we need to handle all possibilities, and determine the result of the |
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135 |
* operation assuming each type. |
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136 |
* For this reason, we have one entry for each possible type, with some expressions |
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137 |
* having more than one entry filled in! |
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138 |
*/ |
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139 |
typedef enum { cs_undefined, /* not defined --> const_value is not valid! */ |
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140 |
cs_const_value, /* const value is valid */ |
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141 |
cs_overflow /* result produced overflow or underflow --> const_value is not valid! */ |
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142 |
} const_status_t; |
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143 |
|
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144 |
typedef struct { |
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145 |
const_status_t status; |
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146 |
real64_t value; |
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147 |
} const_value_real64_t; |
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148 |
const_value_real64_t *const_value_real64; /* when NULL --> UNDEFINED */ |
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149 |
|
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150 |
typedef struct { |
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151 |
const_status_t status; |
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152 |
int64_t value; |
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153 |
} const_value_int64_t; |
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154 |
const_value_int64_t *const_value_int64; /* when NULL --> UNDEFINED */ |
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155 |
|
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156 |
typedef struct { |
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157 |
const_status_t status; |
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158 |
uint64_t value; |
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|
159 |
} const_value_uint64_t; |
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160 |
const_value_uint64_t *const_value_uint64; /* when NULL --> UNDEFINED */ |
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161 |
|
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162 |
typedef struct { |
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163 |
const_status_t status; |
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164 |
bool value; |
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165 |
} const_value_bool_t; |
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166 |
const_value_bool_t *const_value_bool; /* when NULL --> UNDEFINED */ |
417
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|
167 |
|
0
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|
168 |
|
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169 |
public: |
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170 |
/* default constructor */ |
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171 |
symbol_c(int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0, /* order in which it is read by lexcial analyser */ |
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172 |
int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0 /* order in which it is read by lexcial analyser */ |
69 | 173 |
); |
0
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|
174 |
|
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175 |
/* default destructor */ |
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176 |
/* must be virtual so compiler does not complain... */ |
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177 |
virtual ~symbol_c(void) {return;}; |
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178 |
|
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179 |
virtual void *accept(visitor_c &visitor) {return NULL;}; |
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180 |
}; |
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|
181 |
|
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|
182 |
|
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183 |
class token_c: public symbol_c { |
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184 |
public: |
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185 |
/* the value of the symbol. */ |
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186 |
const char *value; |
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187 |
|
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188 |
public: |
286
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189 |
token_c(const char *value, |
287
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|
190 |
int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0, /* order in which it is read by lexcial analyser */ |
9df7fcb9bde5
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|
191 |
int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0 /* order in which it is read by lexcial analyser */ |
286
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192 |
); |
0
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193 |
}; |
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194 |
|
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195 |
|
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196 |
/* a list of symbols... */ |
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197 |
class list_c: public symbol_c { |
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198 |
public: |
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199 |
int n; |
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200 |
symbol_c **elements; |
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201 |
|
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202 |
public: |
287
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203 |
list_c(int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0, /* order in which it is read by lexcial analyser */ |
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204 |
int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0 /* order in which it is read by lexcial analyser */ |
286
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205 |
); |
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206 |
|
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207 |
list_c(symbol_c *elem, |
287
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208 |
int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0, /* order in which it is read by lexcial analyser */ |
9df7fcb9bde5
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209 |
int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0 /* order in which it is read by lexcial analyser */ |
286
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210 |
); |
350
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211 |
/* append a new element to the end of the list */ |
0
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212 |
virtual void add_element(symbol_c *elem); |
350
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213 |
/* insert a new element before position pos. */ |
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214 |
/* To insert into the begining of list, call with pos=0 */ |
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/* To insert into the end of list, call with pos=list->n */ |
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216 |
virtual void insert_element(symbol_c *elem, int pos = 0); |
438
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217 |
/* remove element at position pos. */ |
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virtual void remove_element(int pos = 0); |
350
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}; |
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220 |
|
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|
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#define SYM_LIST(class_name_c, ...) \ |
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class class_name_c: public list_c { \ |
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public: \ |
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__VA_ARGS__ \ |
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class_name_c( \ |
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int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0, \ |
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int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0); \ |
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class_name_c(symbol_c *elem, \ |
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int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0, \ |
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int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0); \ |
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virtual void *accept(visitor_c &visitor); \ |
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}; |
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#define SYM_TOKEN(class_name_c, ...) \ |
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class class_name_c: public token_c { \ |
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public: \ |
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__VA_ARGS__ \ |
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public: \ |
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class_name_c(const char *value, \ |
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int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0, \ |
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int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0); \ |
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virtual void *accept(visitor_c &visitor); \ |
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}; |
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#define SYM_REF0(class_name_c, ...) \ |
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class class_name_c: public symbol_c { \ |
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public: \ |
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__VA_ARGS__ \ |
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class_name_c( \ |
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int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0, \ |
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int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0); \ |
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virtual void *accept(visitor_c &visitor); \ |
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}; |
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#define SYM_REF1(class_name_c, ref1, ...) \ |
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class class_name_c: public symbol_c { \ |
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public: \ |
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symbol_c *ref1; \ |
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__VA_ARGS__ \ |
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public: \ |
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class_name_c(symbol_c *ref1, \ |
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int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0, \ |
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int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0); \ |
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virtual void *accept(visitor_c &visitor); \ |
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}; |
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#define SYM_REF2(class_name_c, ref1, ref2, ...) \ |
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class class_name_c: public symbol_c { \ |
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public: \ |
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symbol_c *ref1; \ |
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symbol_c *ref2; \ |
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__VA_ARGS__ \ |
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public: \ |
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class_name_c(symbol_c *ref1, \ |
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symbol_c *ref2 = NULL, \ |
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int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0, \ |
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int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0); \ |
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virtual void *accept(visitor_c &visitor); \ |
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}; |
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|
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|
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#define SYM_REF3(class_name_c, ref1, ref2, ref3, ...) \ |
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class class_name_c: public symbol_c { \ |
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public: \ |
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symbol_c *ref1; \ |
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symbol_c *ref2; \ |
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symbol_c *ref3; \ |
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__VA_ARGS__ \ |
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public: \ |
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class_name_c(symbol_c *ref1, \ |
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symbol_c *ref2, \ |
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symbol_c *ref3, \ |
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int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0, \ |
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int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0); \ |
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virtual void *accept(visitor_c &visitor); \ |
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305 |
}; |
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|
306 |
|
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|
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#define SYM_REF4(class_name_c, ref1, ref2, ref3, ref4, ...) \ |
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class class_name_c: public symbol_c { \ |
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public: \ |
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symbol_c *ref1; \ |
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symbol_c *ref2; \ |
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symbol_c *ref3; \ |
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symbol_c *ref4; \ |
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__VA_ARGS__ \ |
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public: \ |
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class_name_c(symbol_c *ref1, \ |
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symbol_c *ref2, \ |
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symbol_c *ref3, \ |
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symbol_c *ref4 = NULL, \ |
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int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0, \ |
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int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0); \ |
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virtual void *accept(visitor_c &visitor); \ |
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}; |
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|
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#define SYM_REF5(class_name_c, ref1, ref2, ref3, ref4, ref5, ...) \ |
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class class_name_c: public symbol_c { \ |
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public: \ |
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symbol_c *ref1; \ |
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symbol_c *ref2; \ |
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symbol_c *ref3; \ |
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symbol_c *ref4; \ |
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334 |
symbol_c *ref5; \ |
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335 |
__VA_ARGS__ \ |
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public: \ |
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class_name_c(symbol_c *ref1, \ |
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338 |
symbol_c *ref2, \ |
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339 |
symbol_c *ref3, \ |
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symbol_c *ref4, \ |
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symbol_c *ref5, \ |
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int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0, \ |
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int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0); \ |
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virtual void *accept(visitor_c &visitor); \ |
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}; |
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346 |
|
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347 |
|
350
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#define SYM_REF6(class_name_c, ref1, ref2, ref3, ref4, ref5, ref6, ...) \ |
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class class_name_c: public symbol_c { \ |
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public: \ |
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351 |
symbol_c *ref1; \ |
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symbol_c *ref2; \ |
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symbol_c *ref3; \ |
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symbol_c *ref4; \ |
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symbol_c *ref5; \ |
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symbol_c *ref6; \ |
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__VA_ARGS__ \ |
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public: \ |
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class_name_c(symbol_c *ref1, \ |
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symbol_c *ref2, \ |
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symbol_c *ref3, \ |
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symbol_c *ref4, \ |
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363 |
symbol_c *ref5, \ |
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symbol_c *ref6 = NULL, \ |
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int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0, \ |
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int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0); \ |
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367 |
virtual void *accept(visitor_c &visitor); \ |
0
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|
368 |
}; |
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369 |
|
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370 |
|
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371 |
#include "absyntax.def" |
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|
372 |
|
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|
373 |
|
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|
374 |
|
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375 |
#undef SYM_LIST |
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376 |
#undef SYM_TOKEN |
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#undef SYM_REF0 |
69 | 378 |
#undef SYM_REF1 |
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#undef SYM_REF2 |
69 | 380 |
#undef SYM_REF3 |
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381 |
#undef SYM_REF4 |
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#undef SYM_REF5 |
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383 |
#undef SYM_REF6 |
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384 |
|
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385 |
#endif /* _ABSYNTAX_HH */ |