author | lbessard |
Wed, 10 Jun 2009 15:02:14 +0200 | |
changeset 192 | c6c2a3d487ac |
parent 177 | 697562a5da7c |
child 264 | 6facabd9c2cd |
permissions | -rw-r--r-- |
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/* |
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* (c) 2007 Mario de Sousa |
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* |
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* Offered to the public under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version 2 of the |
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* License, or (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, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
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* Public License for more details. |
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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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* 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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/* |
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* The private interface to stage1_2.cc |
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*/ |
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/* !!! WARNING !!! |
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* |
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* Whoever includes this file (stage1_2_priv.hh) will need |
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* to first inlcude iec.y.hh !! |
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* |
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* Read other comments further down to understand why we don't |
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* include iec.y.hh in this file. |
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*/ |
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/* file with the declarations of symbol tables... */ |
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#include "../util/symtable.hh" |
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#include "stage1_2.hh" |
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/* |
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* This file includes the interface through which the lexical parser (stage 1 - flex) |
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* and the syntax analyser (stage 2 - bison) interact between themselves. |
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* |
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* This is mostly through direct access to shared global variables, however some |
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* of the global variables will only be accessed through some accessor functions. |
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* |
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* This file also includes the interface between the main stage1_2() functions and |
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* the flex lexical parser. |
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* |
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* This file also includes some utility functions (strdupX() ) that are both used |
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* in the lexical and syntax analysers. |
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*/ |
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/*************************************************************/ |
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/*************************************************************/ |
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/**** *****/ |
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/**** I n t e r f a c e B e t w e e n *****/ |
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/**** F l e x a n d s t a g e 1 _ 2 () *****/ |
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/**** *****/ |
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/*************************************************************/ |
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/*************************************************************/ |
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/******************************************************/ |
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/* whether we are suporting safe extensions */ |
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/* as defined in PLCopen - Technical Committee 5 */ |
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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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/******************************************************/ |
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bool get_opt_safe_extensions(); |
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/*************************************************************/ |
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/*************************************************************/ |
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/**** *****/ |
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/**** I n t e r f a c e B e t w e e n *****/ |
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/**** F l e x a n d B i s o n *****/ |
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/**** *****/ |
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/*************************************************************/ |
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/*************************************************************/ |
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/*********************************************/ |
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/* print the include file stack to stderr... */ |
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/*********************************************/ |
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/* This is a service that flex provides to bison... */ |
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void print_include_stack(void); |
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/**************************************/ |
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/* The name of the file being parsed. */ |
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/**************************************/ |
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/* The name of the file currently being parsed... |
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* Note that flex accesses and updates this global variable |
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* apropriately whenever it comes across an (*#include <filename> *) |
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* directive... |
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* ... and bison will use it when producing error messages. |
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* Note that bison also sets this variable correctly to the first |
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* file being parsed. |
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*/ |
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extern const char *current_filename; |
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#define MAX_BUFFER_LENGTH 1000 |
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typedef struct { |
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int eof; |
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int lineNumber; |
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int currentChar; |
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int lineLength; |
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int currentTokenStart; |
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char* buffer; |
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FILE *in_file; |
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} tracking_t; |
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int GetNextChar(char *b, int maxBuffer); |
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tracking_t* GetNewTracking(FILE* in_file); |
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/****************************************************/ |
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/* Controlling the entry to the body_state in flex. */ |
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/****************************************************/ |
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void cmd_goto_body_state(void); |
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int get_goto_body_state(void); |
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void rst_goto_body_state(void); |
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/*************************************************************/ |
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/* Controlling the entry to the sfc_qualifier_state in flex. */ |
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/*************************************************************/ |
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void cmd_goto_sfc_qualifier_state(void); |
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int get_goto_sfc_qualifier_state(void); |
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void rst_goto_sfc_qualifier_state(void); |
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/*************************************************************/ |
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/* Controlling the entry to the sfc_priority_state in flex. */ |
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/*************************************************************/ |
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void cmd_goto_sfc_priority_state(void); |
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int get_goto_sfc_priority_state(void); |
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void rst_goto_sfc_priority_state(void); |
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/*********************************************************/ |
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/* Controlling the entry to the task_init_state in flex. */ |
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/*********************************************************/ |
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void cmd_goto_task_init_state(void); |
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int get_goto_task_init_state(void); |
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void rst_goto_task_init_state(void); |
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/****************************************************************/ |
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/* Returning to state in flex previously pushed onto the stack. */ |
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/****************************************************************/ |
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void cmd_pop_state(void); |
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int get_pop_state(void); |
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void rst_pop_state(void); |
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/*********************************/ |
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/* The global symbol tables... */ |
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/*********************************/ |
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/* NOTE: only accessed indirectly by the lexical parser (flex) |
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* through the function get_identifier_token() |
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* |
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* Bison accesses these data structures directly. |
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* |
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* In essence, they are a data passing mechanism between Bison and Flex. |
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*/ |
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/* NOTE: BOGUS_TOKEN_ID is defined in the bison generated file iec.y.hh. |
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* We need this constant defined before we can declare the symbol tables. |
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* However, we cannot #include "iec.y.hh" in this file (stage1_2_priv.hh) directly |
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* because of the way bison ver. 2.3 is copying all declarations in the prologue |
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* of iec.y to the iec.y.hh file (including an #include stage1_2_priv.hh). |
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* So, if we were to include "iec.y.hh" here, we would get a circular include. |
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* All this means that whoever includes this file (stage1_2_priv.hh) will need |
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* to take care to first inlcude iec.y.hh !! |
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*/ |
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/* A symbol table to store all the library elements */ |
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/* e.g.: <function_name , function_decl> |
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* <fb_name , fb_decl> |
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* <type_name , type_decl> |
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* <program_name , program_decl> |
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* <configuration_name , configuration_decl> |
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*/ |
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extern symtable_c<int, BOGUS_TOKEN_ID> library_element_symtable; |
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|
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/* A symbol table to store the declared variables of |
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* the function currently being parsed... |
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*/ |
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extern symtable_c<int, BOGUS_TOKEN_ID> variable_name_symtable; |
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|
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/* A symbol table to store the declared direct variables of |
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* the function currently being parsed... |
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*/ |
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extern symtable_c<int, BOGUS_TOKEN_ID> direct_variable_symtable; |
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|
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/* Function only called from within flex! |
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* |
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* search for a symbol in either of the two symbol tables |
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* declared above, and return the token id of the first |
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* symbol found. |
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* Searches first in the variables, and only if not found |
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* does it continue searching in the library elements |
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*/ |
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int get_identifier_token(const char *identifier_str); |
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|
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/* Function only called from within flex! |
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* |
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* search for a symbol in direct variables symbol table |
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* declared above, and return the token id of the first |
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* symbol found. |
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*/ |
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int get_direct_variable_token(const char *direct_variable_str); |
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|
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|
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/*************************************************************/ |
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/*************************************************************/ |
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/**** *****/ |
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/**** U t i l i t y F u n c t i o n s ... *****/ |
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/**** *****/ |
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/**** *****/ |
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/*************************************************************/ |
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/*************************************************************/ |
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|
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/* Join two strings together. Allocate space with malloc(3). */ |
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char *strdup2(const char *a, const char *b); |
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|
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/* Join three strings together. Allocate space with malloc(3). */ |
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char *strdup3(const char *a, const char *b, const char *c); |
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|
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|
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