Package com.ibm.wala.cast.ir.ssa

Class AstGlobalRead

java.lang.Object

com.ibm.wala.ssa.SSAInstruction

com.ibm.wala.ssa.SSAFieldAccessInstruction

com.ibm.wala.ssa.SSAGetInstruction

com.ibm.wala.cast.ir.ssa.AstGlobalRead

public class AstGlobalRead
extends SSAGetInstruction

A read of a global variable denoted by a FieldReference

Author:

Julian Dolby (dolby@us.ibm.com)

Nested Class Summary

Nested classes/interfaces inherited from class com.ibm.wala.ssa.SSAInstruction

SSAInstruction.IVisitor, SSAInstruction.Visitor

Field Summary

Fields inherited from class com.ibm.wala.ssa.SSAInstruction

NO_INDEX

Constructor Summary

Constructors

Constructor	Description
AstGlobalRead(int iindex, int lhs, FieldReference global)

Method Summary

Modifier and Type	Method	Description
SSAInstruction	copyForSSA(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.
Collection<TypeReference>	getExceptionTypes()	This method should never return null.
String	getGlobalName()
boolean	isFallThrough()
String	toString(SymbolTable symbolTable)
void	visit(SSAInstruction.IVisitor v)	Apply an IVisitor to this instruction.

Methods inherited from class com.ibm.wala.ssa.SSAGetInstruction

getDef, getDef, getNumberOfDefs, getNumberOfUses, getUse, hasDef, hashCode

Methods inherited from class com.ibm.wala.ssa.SSAFieldAccessInstruction

getDeclaredField, getDeclaredFieldType, getRef, isPEI, isStatic

Methods inherited from class com.ibm.wala.ssa.SSAInstruction

equals, getValueString, iIndex, setInstructionIndex, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

AstGlobalRead

public AstGlobalRead(int iindex,
 int lhs,
 FieldReference global)

Method Details

copyForSSA

public SSAInstruction copyForSSA(SSAInstructionFactory insts,
 int[] defs,
 int[] uses)

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

Overrides:

copyForSSA in class SSAGetInstruction

toString

public String toString(SymbolTable symbolTable)

Overrides:

toString in class SSAGetInstruction

visit

public void visit(SSAInstruction.IVisitor v)

Description copied from class: SSAInstruction

Apply an IVisitor to this instruction. We invoke the appropriate IVisitor method according to the type of this instruction.

Overrides:

visit in class SSAGetInstruction

See Also:

• SSAInstruction.visit(IVisitor)

isFallThrough

public boolean isFallThrough()

Overrides:

isFallThrough in class SSAGetInstruction

Returns:

true iff this instruction may fall through to the next

See Also:

• SSAInstruction.isFallThrough()

getExceptionTypes

public Collection<TypeReference> getExceptionTypes()

Description copied from class: SSAInstruction

This method should never return null.

Overrides:

getExceptionTypes in class SSAInstruction

Returns:

the set of exception types that an instruction might throw ... disregarding athrows and invokes.

getGlobalName

public String getGlobalName()