Class EachElementHasNextInstruction
java.lang.Object
com.ibm.wala.ssa.SSAInstruction
com.ibm.wala.ssa.SSAAbstractBinaryInstruction
com.ibm.wala.cast.ir.ssa.EachElementHasNextInstruction
This instruction represents iterating through the properties of its receiver object. The use
represents an object, and the l-value represents a boolean indicating whether the object has more
properties.
Iterating across the fields or properties of a given object is a common idiom in scripting languages, which is why the IR has first-class support for it.
- Author:
- Julian Dolby (dolby@us.ibm.com)
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Nested Class Summary
Nested classes/interfaces inherited from class com.ibm.wala.ssa.SSAInstruction
SSAInstruction.IVisitor, SSAInstruction.Visitor
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Field Summary
Fields inherited from class com.ibm.wala.ssa.SSAAbstractBinaryInstruction
result, val1, val2
Fields inherited from class com.ibm.wala.ssa.SSAInstruction
NO_INDEX
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Constructor Summary
ConstructorDescriptionEachElementHasNextInstruction
(int iindex, int lValue, int objectRef, int previousPropVal) -
Method Summary
Modifier and TypeMethodDescriptioncopyForSSA
(SSAInstructionFactory insts, int[] defs, int[] uses) This method is meant to be used during SSA conversion for an IR that is not in SSA form.This method should never return null.boolean
toString
(SymbolTable symbolTable) void
Apply an IVisitor to this instruction.Methods inherited from class com.ibm.wala.ssa.SSAAbstractBinaryInstruction
getDef, getDef, getNumberOfDefs, getNumberOfUses, getUse, hasDef, hashCode
Methods inherited from class com.ibm.wala.ssa.SSAInstruction
equals, getValueString, iIndex, isPEI, setInstructionIndex, toString
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Constructor Details
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EachElementHasNextInstruction
public EachElementHasNextInstruction(int iindex, int lValue, int objectRef, int previousPropVal)
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Method Details
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copyForSSA
Description copied from class:SSAInstruction
This method is meant to be used during SSA conversion for an IR that is not in SSA form. It creates a new SSAInstruction of the same type as the receiver, with a combination of the receiver's uses and defs and those from the method parameters.In particular, if the 'defs' parameter is null, then the new instruction has the same defs as the receiver. If 'defs' is not null, it must be an array with a size equal to the number of defs that the receiver instruction has. In this case, the new instruction has defs taken from the array. The uses of the new instruction work in the same way with the 'uses' parameter.
Note that this only applies to CAst-based IR translation, since Java bytecode-based IR generation uses a different SSA construction mechanism.
TODO: move this into the SSAInstructionFactory
- Specified by:
copyForSSA
in classSSAInstruction
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toString
- Specified by:
toString
in classSSAInstruction
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visit
Description copied from class:SSAInstruction
Apply an IVisitor to this instruction. We invoke the appropriate IVisitor method according to the type of this instruction.- Specified by:
visit
in classSSAInstruction
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getExceptionTypes
Description copied from class:SSAInstruction
This method should never return null.- Overrides:
getExceptionTypes
in classSSAInstruction
- Returns:
- the set of exception types that an instruction might throw ... disregarding athrows and invokes.
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isFallThrough
public boolean isFallThrough()- Specified by:
isFallThrough
in classSSAInstruction
- Returns:
- true iff this instruction may fall through to the next
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