Interface IFlowInformation
- All Known Implementing Classes:
FlowInformation
Information relative to execution flow changes. Flow changes are important objects used to
determine boundaries of basic blocks in a CFG.
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Method Summary
Modifier and TypeMethodDescriptionint
Get the number of instructions in the delay slot.Get the a list of targets.boolean
isBroken()
Determine if this object does contain flow information.boolean
Determine if this object does contain flow information and all targets are known.boolean
Determine if this object does contain flow information but has no known targets.boolean
Indicate if the flow information includes a fall-through address (relative to the current instruction) that is not present in the FlowInfo object itself.boolean
Indicate whether this flow information forbids the implicit calculation of a fall-through edge.
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Method Details
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isBroken
boolean isBroken()Determine if this object does contain flow information.- Returns:
- true is the flow is broken (eg, generic branch)
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isBrokenUnknown
boolean isBrokenUnknown()Determine if this object does contain flow information but has no known targets.IMPORTANT: if this flow info object is mixed (it specifies having unknown target(s), and also bears known targets), this method returns false.
- Returns:
- true if the flow is broken but no targets are known
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isBrokenKnown
boolean isBrokenKnown()Determine if this object does contain flow information and all targets are known.- Returns:
- true if the flow is broken and all targets are known
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getTargets
List<ICodePointer> getTargets()Get the a list of targets. Be careful, this list does not include the fall-through target if it is implied (eg, when flow-info is returned byIInstruction.getRoutineCall(long)
) or when its calculation was requested dynamically (viamustComputeFallThrough()
).- Returns:
- the list of addresses that must be checked, possibly empty. A null value signifies no-flow information.
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mustComputeFallThrough
boolean mustComputeFallThrough()Indicate if the flow information includes a fall-through address (relative to the current instruction) that is not present in the FlowInfo object itself. If this method returns true, the caller must dynamically calculate the fall-through address itself.Note that the creator of a flowinfo object may decide to add the fall-through (if any) in the flowinfo object target list. However, in some cases, such as branching instructions with delay slot(s), it is simpler to indicate that the branching instruction allows a fall-through flow, but that it should be computed by the client/user, instead of stored or computed by the flowinfo object.
- Returns:
- true if the flowinfo object does not include a fall-through address, false otherwise
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noFallThrough
boolean noFallThrough()Indicate whether this flow information forbids the implicit calculation of a fall-through edge. (A fall-through may be explicitly specified as atarget
, regardless.)- Returns:
- true if the flowinfo specifies no fall-through
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getDelaySlotCount
int getDelaySlotCount()Get the number of instructions in the delay slot.- Returns:
- number of instructions in delay slot
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