AN3350 datasheet(74/185 Pages) STMICROELECTRONICS

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Working with the assembler

AN3350

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Doc ID 018512 Rev 2

%id, %int, %attr, %reg and %str

The condition operators, %id, %int, %attr, %reg and %str, test their single token

argument (normally an argument passed to a macro) in order to verify belonging to a certain

type. The operators perform as follows:

●

%id

tests for identifiers

●

%int

tests for integers

●

%attr

tests for attributes

●

%reg

tests for registers

●

%str

tests for strings.

%streq

The ‘%streq’operator compares the content of two strings.

%len

The '%len' operator evaluates the length (number of characters) of a string argument.

Example:

%len("abcd") // evaluates to 4

%eval

The '%eval' operator reads and evaluates an integer expression. The expression is

replaced by the result token.

The '#' operator is used inside single line macros to convert macro arguments into strings.

During expansion every macro argument preceded by the character '#' is replaced

(including the operator token) with the string constant token. The latter is formed from the

literal text of the argument.

During macro expansion the '##' operator is used inside single line macros to paste

tokens. Upon expansion the token pairs found on either side of each '##' operator (and the

operator itself), are replaced by a single token. The single token is a concatenation of a

replaced token pair. This operation will be performed only if one of the input tokens is a

macro argument and the result of the combination is a valid token.

%#()

This operator will freeze its result, i.e., during subsequent preprocessor activity the result will

not be further expanded automatically. Before doing so it might also do the following:

●

For one argument that is a string, the string will be broken into individual tokens.

●

For more than one argument, the comma separated list of arguments will be

concatenated "as is" into a single identifier token.

%##()

Works like %#, but expands its arguments first.

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