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45 lines
1.5 KiB
TeX
45 lines
1.5 KiB
TeX
\subsection{Class Edge}
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\definedin{CFG.h}
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Typed Edges join two blocks in the CFG, indicating the type of control flow
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transfer instruction that joins the blocks to each other. Edges may not correspond
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to a control flow transfer instruction at all, as in the case of the {\scshape
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fallthrough} edge that indicates where straight-line control flow is split by
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incoming transfers from another location, such as a branch. While not all
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blocks end in a control transfer instruction, all control transfer instructions
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end basic blocks and have outgoing edges; in the case of unresolvable control
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flow, the edge will target a special ``sink'' block (see \code{sinkEdge()},
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below).
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\begin{center}
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\begin{tabular}{ll}
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\toprule
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EdgeTypeEnum & Meaning \\
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\midrule
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CALL & call edge \\
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COND\_TAKEN & conditional branch--taken \\
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COND\_NOT\_TAKEN & conditional branch--not taken \\
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INDIRECT & branch indirect \\
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DIRECT & branch direct \\
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FALLTHROUGH & direct fallthrough (no branch) \\
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CATCH & exception handler \\
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CALL\_FT & post-call fallthrough \\
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RET & return \\
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\bottomrule
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\end{tabular}
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\end{center}
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\begin{tabular}{p{1.25in}p{1.125in}p{3.125in}}
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\toprule
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Method name & Return type & Method description \\
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\midrule
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src & Block * & Source of the edge. \\
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trg & Block * & Target of the edge. \\
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type & EdgeTypeEnum & Type of the edge. \\
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sinkEdge & bool & True if the target is the sink block. \\
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interproc & bool & True if the edge should be interpreted as interprocedural
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(e.g. calls, returns, unconditional or conditional tail calls). \\
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\bottomrule
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\end{tabular}
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