partial fix for issue 74: allow deref of REF in left hand side of assignment (only works in FUNCTIONS for now)

fix issue #78: IL NOT operator not working

fix issue#77 - when IL FB followed by SFC FB, non-existant error was detected in IL code.

revert commits improved performance of some extensible Standard Functions (ADD, MUL, AND, OR, XOR)

Following commits are reverted:
mjsousa 0b275a2 improve performance of some extensible Standard Functions (ADD, MUL, AND, OR, XOR) -- increase hardcoded limit to 499
mjsousa 2228799 improve performance of some extensible Standard Functions (ADD, MUL, AND, OR, XOR) -- Add comments!!
mjsousa ce81fa6 improve performance of some extensible Standard Functions (ADD, MUL, AND, OR, XOR)"

The reason is that they cause regression in some cases (if function is
used as argument for function block, for example) and this is not
fixed for a long time.

merge

fix backup/restore functions: now also backup/restore programs instantiated to run inside tasks.

add include <time.h>, required for time_t

improve performance of some extensible Standard Functions (ADD, MUL, AND, OR, XOR) -- increase hardcoded limit to 499

improve performance of some extensible Standard Functions (ADD, MUL, AND, OR, XOR) -- Add comments!!

improve performance of some extensible Standard Functions (ADD, MUL, AND, OR, XOR)"

Fix method ./configure uses to determine bison version (did not work in bourne shell) (submitted by anonymous)"

fix bug: allow variables with names starting with 'var' to be used in the first line of POU body

Abort compilation when finding R_EDGE or F_EDGE

Fix bug: XOR operator was broken for ANY_BIT types. No XOR__[DL]WORD__[DL]WORD functions were generated.

Add some comments to code regarding backup/restore functions

fix initialization of variable (was not following ISO C++ rules)

make generating backup/restore functions a command line option (off by default).

add support for generating functions to backup/restore the internal state of the PLC.

delete unused variable.

handle POUs with no VAR .. END_VAR blocks

fix bug introduced in previous commit (matiec was unable to parse SFC code)

Fix tracking of line numbers in IL code (error messages were previously indicating incorrect line number).

Fix bug in datatype narrowing algorithm affecting IL code.

Set the symbol->token member in symbolic_variables_c objects.

Debugging helper class: print value of tokens in debugging output.

Fix bug: allow global variables of type DT (initial values for DT are not const!)

Add comment stating how to enable debug option in flex.

merge

Print error message when FB/Struct initial value contains other strcuts/FB/arrays (not yet supported by C code generator).

Do datatype checking of initial values for structures and FBs, and print error messages when compiling erroneuos source code.

fix bug in symbol_c::find_element()

Acceept structure_element_declaration_c symbol as a possible (non base type) data type

Add token references in structure_element_declaration_c

Add token reference to all symbol_c, and add list_c::find_element()

remove debug code left in by mistake in previous commit

Access elements[] in list_c through a new get_element() method.

Start implementation of datatype checking of initial values for structures and FBs.

fix wrong common_ticktime if task interval is greater than 4.3 seconds

Allow use of GLOBAL/EXTERNAL variables as control variable of FOR loop.

Start adding support for explicit initialization of FB instances. Currently only allows initializing FB variables of elementary types.

merge

merge

merge

Fix date conversion function (seconds to Date_and_Time). First day of month was falling on previous month.

Fix error locations messed up in previous commit.

fix compilation of SFC transitions written in IL (compiler was entering endless loop)

fix SFC timed qualifier (D, L, ...) with variable time (was generating wrong C code)

Fix segmentation fault bug introduced by previous commit

Correcty determine the datatype (TIME) of the parameters of SFC actions with timed qualifiers

Check that flex is installed during ./configure

Fix code generation for XOR expressions in ST (add parenthesis)

merge

make autogenerated functions to be 'static inline' instead of 'inline'

This fixes link issue and compile warning, for more details about this
issue look at
https://bitbucket.org/mjsousa/matiec/issues/53/c-compiler-warning-if-iec-function-is-used

Merged mjsousa/matiec into default

merge

Merged mjsousa/matiec into default

fix bug introduced by commit 91bef6704b44 (parsing SFCs with transitions in ST and leading whitespace => endless loop)

Only allow function invocation outside ST expressions when command line option is activated.

Ignore pragmas inside IL code when handling inline function calls.

Fix bug: correctly handle formal function calls in IL with no parameters.

Add support for functions returning VOID (i.e. non-standard extension, allowing functions that do not return any data)

Add -warn flag when running flex -> warn of potential bugs

Add support for non-standard VOID datatype. May ony be used to define functions returning VOID.

Delete the YY_NO_UNPUT define, as we do use the unput() function.

Add support for non standard feature: allow POUs with no in, out and inout parameters

Add option to not add the EN and ENO parameters to every function and FB (generated C code becomes smaller, and uses less memory for function invocations)

Correctly identify errors when parsing erroneous code (make sure flex goes back to INITIAL state when code contains errors that do not allow determining whether ST or IL is being parsed)

Created new branch fix_compilation_warnings

fix compilation error about missing braces

IEC_TIMESPEC has two fields tv_sec and tv_nsec.

Compilation error:
./build/POUS.c:600:45: error: missing braces around initializer [-Werror=missing-braces]
static const STEP temp_step = {{0, 0}, 0, {0, 0}};
^
compilation terminated due to -Wfatal-errors.

fix warning about overflow if matiec is running on 64-bit platform,
but the generated C code will cross-compiled for 32-bit platform

For example:
./build/config.c:29:39: error: large integer implicitly truncated to unsigned type [-Werror=overflow]
unsigned long greatest_tick_count__ = 18446744073709551611UL; /*tick*/
^
compilation terminated due to -Wfatal-errors.
cc1: all warnings being treated as errors

fix C compilation warning about function prototype in __SET_EXTERNAL

Example warning:
./POUS.c:1220:3: error: function declaration isn't a prototype [-Werror=strict-prototypes]
__SET_EXTERNAL(data__->,KN_AUT,,__GET_VAR(data__->KEY_AUT.STATE_OUT));
^
compilation terminated due to -Wfatal-errors.
cc1: all warnings being treated as errors

fix C compilation warning from gcc about /* inside of comment section.


./beremiz/iec_std_lib.h:240:1: error: "/*" within comment [-Werror=comment]
/*
^
compilation terminated due to -Wfatal-errors.
cc1: all warnings being treated as errors

Update README.build file with instructions for crosscompiling to win32

Delete commented out code.

Fix FB calls in IL (FB variable name was showing up extraneously before the C function that initializes the POU containing the FB call)

Delete unused code.

Add check for repeated elements in a CASE statement. Emit warnings (and not errors) if found.

transform CASE into if()..else if().. -> fixes 2 bugs (1)case within case statements, and (2)repeated elements in case options

Initialise arrays to their correct default values - Fix bug introduced in commit 477393b00f95 (2014-11-16)

Fixed reset of current_varqualifier when generating global initializers, causin RETAIN and other option to be ORed and applied to all subsequent global variables.

Do fill/narrow datatype analysis algorithm for derived_datatype_identifier_c (fixes bug related to arrays of arrays that was generating incorrect C code).

Better identification of error location in some error messages.

Fix bug introduced in 2014/10/19, while adding support for REF() opertors -> datatype checking was not catching datatype inconsistency errors!

merge

Re-write and fix the logic of SFC action modifiers.

Correct the number given to actions in the #define's

Do not allow constant_propagation algorithm go into infinite loop when analysing code with circular references.

Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.

Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.

Let get_datatype_info_c handle variable sized arrays, even if constant folding is not yet done.

Correctly analyse external<->global var compatibility when using variable sized arrays (TODO: does not yet work for FBs!)

Add comment about bug that needs to be fixed later on.

Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c

Add check whether the same constant var_external variable is initialised with two (or more) different constant values.

Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.

Disable constant propagation again (still not working correctly)

Make support for use of variables in array size declarations a command line option (off by default)

Add debug_c::print(const_value_c) for printing of const values.

Add is_undefined() method to const_value_c

Make error message more informative.

Add comments.

Add checks for use of non constant value in subranges, and lower_limit > upper_limit.

Fix previous commit (symtable operator[] must return a reference to the stored value!)

Do constant propagation of configuration/resource variables, taking into account scope of variables.

Change dsymbtable_c -> use design pattern used by C++ standard library (STL)

Change symbtable_c -> use design pattern used by C++ standard library (STL)

Remove debugging code left in by mistake.

Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)

Do constant folding of default initial values of datatypes.

Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.

When generating C code, use the const_value of a symbolic_variable when it is used in a subrange.

Small code re-organization of how const values are stored in symbol_c (can now be accessed through member functions, instead of macros)