author | laurent |
Sat, 12 Mar 2011 18:43:02 +0100 | |
changeset 249 | d58a45824531 |
parent 202 | da1a8186f86f |
child 257 | 90782e241346 |
permissions | -rw-r--r-- |
202
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Initial (very rough) version of semantic checker (stage3)
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/* |
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* (c) 2009 Mario de Sousa |
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Initial (very rough) version of semantic checker (stage3)
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* |
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Initial (very rough) version of semantic checker (stage3)
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4 |
* Offered to the public under the terms of the GNU General Public License |
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Initial (very rough) version of semantic checker (stage3)
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* as published by the Free Software Foundation; either version 2 of the |
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Initial (very rough) version of semantic checker (stage3)
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* License, or (at your option) any later version. |
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* |
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Initial (very rough) version of semantic checker (stage3)
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* This program is distributed in the hope that it will be useful, but |
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Initial (very rough) version of semantic checker (stage3)
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
da1a8186f86f
Initial (very rough) version of semantic checker (stage3)
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
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Initial (very rough) version of semantic checker (stage3)
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* Public License for more details. |
da1a8186f86f
Initial (very rough) version of semantic checker (stage3)
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* |
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Initial (very rough) version of semantic checker (stage3)
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* This code is made available on the understanding that it will not be |
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Initial (very rough) version of semantic checker (stage3)
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* used in safety-critical situations without a full and competent review. |
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*/ |
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16 |
|
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/* |
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* An IEC 61131-3 IL and ST 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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24 |
|
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|
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/* Determine the size, in bits, of the data type. |
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* |
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* NOTE: Currently, only elementary data types with well defined sizes (in the standard) are supported. |
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* - derived data types are not supported, and these will return 0 |
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* - TIME, DATE, TIME_OF_DAY, and DATE_AND_TIME are not supported, and will return 0 |
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* - STRING and WSTRING are not supported, and the standard merely defines bit per character, |
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* and not the maximum number of characters, so these will return 0 |
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* |
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* We also support the 'Numeric Literals' Data types. |
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* i.e., numeric literals are considerd basic data types |
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* as their data type is undefined (e.g. the datat type of '30' |
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* could be 'INT' or 'SINT' or 'LINT' or 'USINT' or ... |
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* |
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* For numeric literals, we return the minimum number of bits |
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* required to store the value. |
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* |
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* E.g. TYPE new_int_t : INT; END_TYPE; |
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* TYPE new_int2_t : INT = 2; END_TYPE; |
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* TYPE new_subr_t : INT (4..5); END_TYPE; |
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* |
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* sizeof(SINT) -> 8 |
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* sizeof(INT) -> 16 |
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* sizeof(DINT) -> 32 |
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* sizeof(LINT) -> 64 |
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* |
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* sizeof('1') -> 1 |
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* sizeof('015') -> 4 # Leading zeros are ignored! |
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* sizeof('0') -> 1 # This is a special case! Even the value 0 needs at least 1 bit to store! |
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* sizeof('16') -> 5 |
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* sizeof('2#00101') -> 3 |
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* sizeof('8#334') -> 9 |
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* sizeof('16#2A') -> 8 |
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* |
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* sizeof('7.4') -> 32 # all real literals return 32 bits, the size of a 'REAL' |
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* # TODO: study IEC 60559 for the range of values that may be |
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* # stored in a REAL (basic single width floating point format) |
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* # and in a LREAL (basic double width floating point format) |
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* # and see if some real literals need to return 64 instead! |
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64 |
*/ |
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#include "../absyntax/visitor.hh" |
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class get_sizeof_datatype_c: public null_visitor_c { |
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|
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public: |
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static int getsize(symbol_c *data_type_symbol); |
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~get_sizeof_datatype_c(void); |
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private: |
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/* this class is a singleton. So we need a pointer to the single instance... */ |
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static get_sizeof_datatype_c *singleton; |
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|
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private: |
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/*********************/ |
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/* B 1.2 - Constants */ |
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/*********************/ |
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|
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/******************************/ |
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/* B 1.2.1 - Numeric Literals */ |
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/******************************/ |
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/* Numeric literals without any explicit type cast have unknown data type, |
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* so we continue considering them as their own basic data types until |
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* they can be resolved (for example, when using '30+x' where 'x' is a LINT variable, the |
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* numeric literal '30' must then be considered a LINT so the ADD function may be called |
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* with all inputs of the same data type. |
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* If 'x' were a SINT, then the '30' would have to be a SINT too! |
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*/ |
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void *visit(real_c *symbol); |
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void *visit(integer_c *symbol); |
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void *visit(binary_integer_c *symbol); |
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void *visit(octal_integer_c *symbol); |
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void *visit(hex_integer_c *symbol); |
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/***********************************/ |
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/* B 1.3.1 - Elementary Data Types */ |
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/***********************************/ |
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// void *visit(time_type_name_c *symbol); |
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void *visit(bool_type_name_c *symbol); |
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void *visit(sint_type_name_c *symbol); |
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void *visit(int_type_name_c *symbol); |
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void *visit(dint_type_name_c *symbol); |
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void *visit(lint_type_name_c *symbol); |
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void *visit(usint_type_name_c *symbol); |
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void *visit(uint_type_name_c *symbol); |
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void *visit(udint_type_name_c *symbol); |
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void *visit(ulint_type_name_c *symbol); |
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void *visit(real_type_name_c *symbol); |
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void *visit(lreal_type_name_c *symbol); |
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// void *visit(date_type_name_c *symbol); |
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// void *visit(tod_type_name_c *symbol); |
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// void *visit(dt_type_name_c *symbol) ; |
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void *visit(byte_type_name_c *symbol); |
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void *visit(word_type_name_c *symbol); |
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void *visit(dword_type_name_c *symbol); |
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void *visit(lword_type_name_c *symbol); |
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// void *visit(string_type_name_c *symbol); |
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// void *visit(wstring_type_name_c *symbol); |
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123 |
|
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/******************************************************/ |
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/* Extensions to the base standard as defined in */ |
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/* "Safety Software Technical Specification, */ |
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/* Part 1: Concepts and Function Blocks, */ |
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/* Version 1.0 – Official Release" */ |
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/* by PLCopen - Technical Committee 5 - 2006-01-31 */ |
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/******************************************************/ |
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void *visit(safebool_type_name_c *symbol); |
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|
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/********************************/ |
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/* B 1.3.3 - Derived data types */ |
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/********************************/ |
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#if 0 |
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/* simple_type_name ':' simple_spec_init */ |
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void *visit(simple_type_declaration_c *symbol); |
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/* simple_specification ASSIGN constant */ |
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void *visit(simple_spec_init_c *symbol); |
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/* subrange_type_name ':' subrange_spec_init */ |
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void *visit(subrange_type_declaration_c *symbol); |
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/* subrange_specification ASSIGN signed_integer */ |
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void *visit(subrange_spec_init_c *symbol); |
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/* integer_type_name '(' subrange')' */ |
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void *visit(subrange_specification_c *symbol); |
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/* signed_integer DOTDOT signed_integer */ |
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void *visit(subrange_c *symbol); |
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149 |
|
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/* enumerated_type_name ':' enumerated_spec_init */ |
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void *visit(enumerated_type_declaration_c *symbol); |
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/* enumerated_specification ASSIGN enumerated_value */ |
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void *visit(enumerated_spec_init_c *symbol); |
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154 |
/* helper symbol for enumerated_specification->enumerated_spec_init */ |
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/* enumerated_value_list ',' enumerated_value */ |
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void *visit(enumerated_value_list_c *symbol); |
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/* enumerated_type_name '#' identifier */ |
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// SYM_REF2(enumerated_value_c, type, value) |
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void *visit(enumerated_value_c *symbol); |
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160 |
/* identifier ':' array_spec_init */ |
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161 |
void *visit(array_type_declaration_c *symbol); |
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162 |
/* array_specification [ASSIGN array_initialization} */ |
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/* array_initialization may be NULL ! */ |
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void *visit(array_spec_init_c *symbol); |
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/* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */ |
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void *visit(array_specification_c *symbol); |
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/* helper symbol for array_specification */ |
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168 |
/* array_subrange_list ',' subrange */ |
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169 |
void *visit(array_subrange_list_c *symbol); |
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170 |
/* array_initialization: '[' array_initial_elements_list ']' */ |
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171 |
/* helper symbol for array_initialization */ |
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172 |
/* array_initial_elements_list ',' array_initial_elements */ |
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173 |
void *visit(array_initial_elements_list_c *symbol); |
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174 |
/* integer '(' [array_initial_element] ')' */ |
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/* array_initial_element may be NULL ! */ |
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176 |
void *visit(array_initial_elements_c *symbol); |
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177 |
/* structure_type_name ':' structure_specification */ |
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178 |
/* NOTE: structure_specification will point to either a |
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179 |
* initialized_structure_c |
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180 |
* OR A |
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181 |
* structure_element_declaration_list_c |
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182 |
*/ |
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183 |
void *visit(structure_type_declaration_c *symbol); |
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184 |
/* structure_type_name ASSIGN structure_initialization */ |
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/* structure_initialization may be NULL ! */ |
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186 |
void *visit(initialized_structure_c *symbol); |
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187 |
/* helper symbol for structure_declaration */ |
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188 |
/* structure_declaration: STRUCT structure_element_declaration_list END_STRUCT */ |
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189 |
/* structure_element_declaration_list structure_element_declaration ';' */ |
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190 |
void *visit(structure_element_declaration_list_c *symbol); |
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191 |
/* structure_element_name ':' *_spec_init */ |
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192 |
void *visit(structure_element_declaration_c *symbol); |
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193 |
/* helper symbol for structure_initialization */ |
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194 |
/* structure_initialization: '(' structure_element_initialization_list ')' */ |
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195 |
/* structure_element_initialization_list ',' structure_element_initialization */ |
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void *visit(structure_element_initialization_list_c *symbol); |
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197 |
/* structure_element_name ASSIGN value */ |
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198 |
void *visit(structure_element_initialization_c *symbol); |
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199 |
/* string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */ |
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200 |
/* |
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201 |
SYM_REF4(string_type_declaration_c, string_type_name, |
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202 |
elementary_string_type_name, |
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203 |
string_type_declaration_size, |
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string_type_declaration_init) // may be == NULL! |
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205 |
*/ |
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206 |
void *visit(string_type_declaration_c *symbol); |
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207 |
#endif |
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208 |
}; // get_sizeof_datatype_c |
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209 |
|
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210 |
|
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211 |
|
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212 |