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49 lines
2.7 KiB
TeX
49 lines
2.7 KiB
TeX
\subsection{Dereference Class}
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\label{sec:dereference}
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A \code{Dereference} object is an \code{Expression} that dereferences another \code{ValueComputation}.
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A \code{Dereference} contains an \code{Expression} representing an effective address computation. Its use set is the same as the use set of the \code{Expression} being dereferenced.
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It is not possible, given the information in a single instruction, to evaluate the result of a dereference. \code{eval} may still be called on an \code{Expression} that includes dereferences, but the expected use case is as follows:
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\begin{itemize}
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\item Determine the address being used in a dereference via the \code{eval} mechanism
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\item Perform analysis to determine the contents of that address
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\item If necessary, fill in the \code{Dereference} node with the contents of that addresss, using \code{setValue}
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\end{itemize}
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The type associated with a \code{Dereference} node will be the type of the value {\itshape read\/} {\itshape from\/} {\itshape memory\/}, not the type used for the address computation. Two \code{Dereference}s that access the same address but interpret the contents of that memory as different types will produce different values. The children of a \code{Dereference} at a given address are identical, regardless of the type of dereference being performed at that address. For example, the \code{Expression} shown in Figure 6 could have its root \code{Dereference}, which interprets the memory being dereferenced as a unsigned 16-\/bit integer, replaced with a \code{Dereference} that interprets the memory being dereferenced as any other type. The remainder of the \code{Expression} tree would, however, remain unchanged.
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\begin{apient}
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Dereference (Expression::Ptr addr, Result_Type result_type)
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\end{apient}
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\apidesc{
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A \code{Dereference} is constructed from an \code{Expression} pointer (raw or shared) representing the address
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to be dereferenced and a type indicating how the memory at the address in question is to be interpreted.
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}
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\begin{apient}
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virtual void getChildren (vector< InstructionAST::Ptr > & children) const
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\end{apient}
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\apidesc{
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A \code{Dereference} has one child, which represents the address being dereferenced.
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Appends the child of this \code{Dereference} to \code{children}.
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}
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\begin{apient}
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virtual void getUses (set< InstructionAST::Ptr > & uses)
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\end{apient}
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\apidesc{
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The use set of a \code{Dereference} is the same as the use set of its children.
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The use set of this \code{Dereference} is inserted into \code{uses}.
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}
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\begin{apient}
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virtual bool isUsed (InstructionAST::Ptr findMe) const
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\end{apient}
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\apidesc{
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An \code{InstructionAST} is used by a \code{Dereference} if it is equivalent to the \code{Dereference} or it is used by
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the lone child of the \code{Dereference}
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}
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