public class TrapUnitGraph extends UnitGraph
Represents a CFG for a Body instance where the nodes are
Unit instances, and where, in additional to unexceptional
control flow edges, edges are added from every trapped Unit to the Trap's handler Unit, regardless
of whether the trapped Units may actually throw the
exception caught by the Trap.
There are three distinctions between the exceptional edges added
in TrapUnitGraph and the exceptional edges added in
ExceptionalUnitGraph:
ExceptionalUnitGraph, the edges to
Traps are associated with Units which
may actually throw an exception which the Trap
catches (according to the ThrowAnalysis used in the
construction of the graph). In TrapUnitGraph, there
are edges from every trapped Unit to the
Trap, regardless of whether it can throw an exception
caught by the Trap.
ExceptionalUnitGraph, when a Unit may
throw an exception that is caught by a Trap there
are edges from every predecessor of the excepting
Unit to the Trap's handler. In
TrapUnitGraph, edges are not added from the
predecessors of excepting Units.ExceptionalUnitGraph, when a Unit may
throw an exception that is caught by a Trap, there
may be no edge from the excepting Unit itself to the
Trap (depending on the possibility of side effects
and the setting of the omitExceptingUnitEdges
parameter). In TrapUnitGraph, there is always an edge
from the excepting Unit to the
Trap.body, heads, method, tails, unitChain, unitToPreds, unitToSuccs| Constructor and Description |
|---|
TrapUnitGraph(Body body)
Constructs the graph from a given Body instance.
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| Modifier and Type | Method and Description |
|---|---|
protected void |
buildExceptionalEdges(java.util.Map<Unit,java.util.List<Unit>> unitToSuccs,
java.util.Map<Unit,java.util.List<Unit>> unitToPreds)
Method to compute the edges corresponding to exceptional
control flow.
|
addEdge, buildHeadsAndTails, buildUnexceptionalEdges, combineMapValues, getBody, getExtendedBasicBlockPathBetween, getHeads, getPredsOf, getSuccsOf, getTails, iterator, makeMappedListsUnmodifiable, size, toStringpublic TrapUnitGraph(Body body)
the - Body instance from which the graph is built.protected void buildExceptionalEdges(java.util.Map<Unit,java.util.List<Unit>> unitToSuccs, java.util.Map<Unit,java.util.List<Unit>> unitToPreds)
unitToSuccs - A Map from Units to Lists of Units. This is an “out
parameter”; buildExceptionalEdges
will add a mapping for every Unit
within the scope of one or more Traps to a List of the handler
units of those Traps.unitToPreds - A Map from Units to
Lists of Units. This is an
“out parameter”;
buildExceptionalEdges will add a
mapping for every Trap handler to
all the Units within the scope of
that Trap.