The .COMM
directive makes a storage request for a specified number of bytes.
Syntax |
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Parameters |
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- label
Labels the location of the reserved storage.
- num_bytes
An integer value for the number of bytes you want
to reserve. The Assembler uses a default value of 4 if the .COMM
directive lacks a num_bytes parameter.
Permissible values range from one to 0x3FFFFFFF.
Discussion |
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The .COMM
directive declares a block of storage that can be thought of as
a common block. You must label every .COMM
directive. The linker associates the label
with the subspace in which the .COMM
directive is declared and allocates the necessary storage within
that subspace. .COMM
always allocates its space in the $BSS$
subspace of the $PRIVATE$
space. If the label
of a .COMM directive
appears in several object modules, the linker uses the maximum size
specified in any module when it allocates the necessary storage
in the current subspace.
Example |
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This example reserves 16 bytes of storage for mydata.
