2 Supported C language subset:
6 * binary operators, by decreasing priority order: '*' '/' '%',
7 '+' '-', '>>' '<<', '<' '<=' '>' '>=', '==' '!=', '&',
8 '^', '|', '=', '&&', '||'.
10 * '&&' and '||' have the same semantics as C : left to right
11 evaluation and early exit.
13 * Parenthesis are supported.
15 * Comma operator is supported.
17 * Trinary operator (?:) is not supported.
19 * Unary operators: '&', '*' (pointer indirection), '-'
20 (negation), '+', '!', '~', '++' and '--'.
22 * Pointer indirection ('*') is supported.
24 * Square brackets are supported.
26 * '=' and <op>= are supported.
28 * Function calls are supported with standard Linux calling
29 convention. Function pointers are supported.
30 Functions can be used before being declared.
32 - sizeof() is not supported.
35 + int, short, char, float, double
37 + variables can be initialized in declarations.
38 + Only ANSI-style function declarations are supported.
39 - "..." is not supported.
41 - const is not supported
42 - signed and unsigned are not supported.
43 - arrays are supported
44 - long doubles are not supported
45 - structs and unions are supported
46 - typedef is supported
47 - explicit storage class specifiers are not supported: register, auto, static, extern
49 - Unknown functions and variables are bound at compile time by calling
50 back to the caller. For the 'acc' command-line tool unknown functions
51 and variables are looked up using dlsym, to allow using many libc
52 functions and variables.
54 - Instructions: blocks ('{' '}') are supported as in C. 'if' and
55 'else' can be used for tests. The 'while' and 'for' C constructs
56 are supported for loops. 'break' can be used to exit
57 loops. 'return' is used for the return value of a function.
59 - switch / case is not supported.
60 - goto and labels are not supported.
61 - continue is not supported.
63 - Identifiers are parsed the same way as C. Local variables are
64 handled, but there is no local name space (not a problem if
65 different names are used for local and global variables).
67 - Numbers can be entered in decimal, hexadecimal ('0x' or '0X'
68 prefix), or octal ('0' prefix).
70 - Float and double constants are supported.
72 - '#define' is supported without function like arguments.
73 - Macro recursion is allowed.
74 - Self-referential macros are handled as in gcc.
75 - '#pragma' is supported. The pragma text is passed to a callback function,
76 and is used to implement meta-information.
77 - Other preprocessor directives are ignored.
79 - C Strings and C character constants are supported. All ANSI C
80 character escapes are supported.
82 - Both C comments ( /* */ ) and C++ comments ( // ... end-of-line ) are
85 - Some syntax errors are reported, others may cause a crash.
87 - Memory: the code, data, and symbol sizes are limited to 100KB
88 (it can be changed in the source code).