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Supported C language subset (read joint example 'otccex.c' to have
an introduction to OTCC dialect):
- Expressions:
* binary operators, by decreasing priority order: '*' '/' '%',
'+' '-', '>>' '<<', '<' '<=' '>' '>=', '==' '!=', '&',
'^', '|', '=', '&&', '||'.
* '&&' and '||' have the same semantics as C : left to right
evaluation and early exit.
* Parenthesis are supported.
* Unary operators: '&', '*' (pointer indirection), '-'
(negation), '+', '!', '~', post fixed '++' and '--'.
* Pointer indirection ('*') only works with explicit cast to
'char *', 'int *' or 'int (*)()' (function pointer).
* '++', '--', and unary '&' can only be used with variable
lvalue (left value).
* '=' can only be used with variable or '*' (pointer
indirection) lvalue.
* Function calls are supported with standard i386 calling
convention. Function pointers are supported with explicit
cast. Functions can be used before being declared.
- Types: only signed integer ('int') variables and functions can
be declared. Variables cannot be initialized in
declarations. Only old K&R function declarations are parsed
(implicit integer return value and no types on arguments).
- Any function or variable from the libc can be used because OTCC
uses the libc dynamic linker to resolve undefined symbols.
- Instructions: blocks ('{' '}') are supported as in C. 'if' and
'else' can be used for tests. The 'while' and 'for' C constructs
are supported for loops. 'break' can be used to exit
loops. 'return' is used for the return value of a function.
- Identifiers are parsed the same way as C. Local variables are
handled, but there is no local name space (not a problem if
different names are used for local and global variables).
- Numbers can be entered in decimal, hexadecimal ('0x' or '0X'
prefix), or octal ('0' prefix).
- '#define' is supported without function like arguments. No macro
recursion is tolerated. Other preprocessor directives are
ignored.
- C Strings and C character constants are supported. Only '\n',
'\"', '\'' and '\\' escapes are recognized.
- C Comments can be used (but no C++ comments).
- No error is displayed if an incorrect program is given.
- Memory: the code, data, and symbol sizes are limited to 100KB
(it can be changed in the source code).
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