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View of /sml/trunk/src/MLRISC/Doc/latex/pseudo-ops.tex

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Thu Jun 1 18:34:03 2000 UTC (19 years, 2 months ago) by monnier
File size: 1439 byte(s)
bring revisions from the vendor branch to the trunk
\section{Client Defined Pseudo Ops}
\newdef{Pseudo ops}
are client defined instruction stream markers.  They
can be used to represent assembly directives.
Pseudo ops should satisfy the following signature:
signature \mlrischref{instructions/pseudoOps.sig}{PSEUDO_OPS} = sig
  type pseudo_op
  val toString : pseudo_op -> string
  val emitValue : {pOp:pseudo_op, loc:int, emit:Word8.word -> unit} -> unit
  val sizeOf : pseudo_op * int -> int
  val adjustLabels : pseudo_op * int -> bool

The method that is required is:
 \item \sml{toString} -- pretty printing the pseudo in assembly format.

When machine code generation is used, we also have to implement
the following methods:
 \item \sml{emitValue} --
    emit value of pseudo op give current location counter and output
    stream. The value emitted should respect the endianness of the
    target machine.
 \item \sml{sizeOf} --
    Size of the pseudo op in bytes given the current location counter
    The location counter is provided in case some pseudo ops are 
    dependent on alignment considerations.
 \item \sml{adjustLabels} --
    adjust the value of labels in the pseudo op given the current
    location counter.
These methods are involved during the 
\href{span-dep.html}{span dependence resolution} phase to determine
the size and layout of the pseudo ops.

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