90 lines
3.1 KiB
Plaintext
90 lines
3.1 KiB
Plaintext
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Supported C language subset:
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- Expressions:
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* binary operators, by decreasing priority order: '*' '/' '%',
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'+' '-', '>>' '<<', '<' '<=' '>' '>=', '==' '!=', '&',
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'^', '|', '=', '&&', '||'.
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* '&&' and '||' have the same semantics as C : left to right
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evaluation and early exit.
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* Parenthesis are supported.
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* Comma operator is supported.
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* Trinary operator (?:) is not supported.
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* Unary operators: '&', '*' (pointer indirection), '-'
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(negation), '+', '!', '~', '++' and '--'.
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* Pointer indirection ('*') is supported.
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* Square brackets are supported.
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* '=' and <op>= are supported.
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* Function calls are supported with standard Linux calling
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convention. Function pointers are supported.
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Functions can be used before being declared.
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- sizeof() is not supported.
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- Types:
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+ int, short, char, float, double
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+ pointers
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+ variables can be initialized in declarations.
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+ Only ANSI-style function declarations are supported.
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- "..." is not supported.
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- short is supported
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- const is not supported
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- signed and unsigned are not supported.
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- arrays are supported
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- long doubles are not supported
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- structs and unions are supported
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- typedef is supported
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- explicit storage class specifiers are not supported: register, auto, static, extern
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- Unknown functions and variables are bound at compile time by calling
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back to the caller. For the 'acc' command-line tool unknown functions
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and variables are looked up using dlsym, to allow using many libc
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functions and variables.
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- Instructions: blocks ('{' '}') are supported as in C. 'if' and
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'else' can be used for tests. The 'while' and 'for' C constructs
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are supported for loops. 'break' can be used to exit
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loops. 'return' is used for the return value of a function.
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- switch / case is not supported.
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- goto and labels are not supported.
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- continue is not supported.
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- Identifiers are parsed the same way as C. Local variables are
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handled, but there is no local name space (not a problem if
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different names are used for local and global variables).
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- Numbers can be entered in decimal, hexadecimal ('0x' or '0X'
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prefix), or octal ('0' prefix).
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- Float and double constants are supported.
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- '#define' is supported without function like arguments.
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- Macro recursion is allowed.
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- Self-referential macros are handled as in gcc.
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- '#pragma' is supported. The pragma text is passed to a callback function,
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and is used to implement meta-information.
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- Other preprocessor directives are ignored.
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- C Strings and C character constants are supported. All ANSI C
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character escapes are supported.
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- Both C comments ( /* */ ) and C++ comments ( // ... end-of-line ) are
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supported.
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- Some syntax errors are reported, others may cause a crash.
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- Memory: the code, data, and symbol sizes are limited to 100KB
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(it can be changed in the source code).
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