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The ._line_top directive is the information specified by the compiler #pragma inline_asm statement.

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This is the #pragma inline_asm statement information of the C source program that the compiler outputs.

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The ._line_top directive indicates the start of the instructions for a function which has been specified as inline_asm.

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Assembler control instructions excluding $MACRO,$NOMACRO, $WARNING and $NOWARNING are not usable in assembly code for functions specified as inline_asm. In addition, only the directives listed below are usable. Specifying any other directive will lead to an error.

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In the .PUBLIC directive in the function specified with inline_asm, only the labels defined in the function specified with inline_asm can be used. Any other labels will lead to errors.

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Though instruction expansion is disabled in functions specified as inline_asm, instruction expansion can be enabled with the $MACRO control instruction. The effect of $MACRO and $NOWARNING is disabled when the ._line_end directive appears.