Package com.ibm.wala.ssa
Interface SSAPiNodePolicy
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- All Known Implementing Classes:
CompoundPiPolicy
,InstanceOfPiPolicy
,NullTestPiPolicy
public interface SSAPiNodePolicy
TheSSABuilder
consults this as an oracle to decide how to insertSSAPiInstruction
s
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description Pair<Integer,SSAInstruction>
getPi(SSAAbstractInvokeInstruction call, SymbolTable symbolTable)
Do we need to introduce a new name for some value immediately after a call? If so, returns a pair consisting of the value number needing renaming, and the instruction which should be recorded as the cause of the pi instructionPair<Integer,SSAInstruction>
getPi(SSAConditionalBranchInstruction cond, SSAInstruction def1, SSAInstruction def2, SymbolTable symbolTable)
Do we need to introduce a new name for some value after deciding on an outcome for a conditional branch instruction? If so, returns a pair consisting of the value number needing renaming, and the instruction which should be recorded as the cause of the pi instruction
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Method Detail
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getPi
Pair<Integer,SSAInstruction> getPi(SSAAbstractInvokeInstruction call, SymbolTable symbolTable)
Do we need to introduce a new name for some value immediately after a call? If so, returns a pair consisting of the value number needing renaming, and the instruction which should be recorded as the cause of the pi instruction- Parameters:
call
- the call instruction in questionsymbolTable
- current state of the symbol table for the IR under construction- Returns:
- description of the necessary pi instruction, or null if no pi instruction is needed.
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getPi
Pair<Integer,SSAInstruction> getPi(SSAConditionalBranchInstruction cond, SSAInstruction def1, SSAInstruction def2, SymbolTable symbolTable)
Do we need to introduce a new name for some value after deciding on an outcome for a conditional branch instruction? If so, returns a pair consisting of the value number needing renaming, and the instruction which should be recorded as the cause of the pi instruction- Parameters:
cond
- the conditional branch instruction in questiondef1
- theSSAInstruction
that defs cond.getUse(0), or null if nonedef2
- theSSAInstruction
that defs cond.getUse(1), or null if nonesymbolTable
- current state of the symbol table for the IR under construction- Returns:
- description of the necessary pi instruction, or null if no pi instruction is needed.
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