Class AstLexicalRead

java.lang.Object

com.ibm.wala.ssa.SSAInstruction

com.ibm.wala.cast.ir.ssa.AstLexicalAccess

com.ibm.wala.cast.ir.ssa.AstLexicalRead

public class AstLexicalRead
extends AstLexicalAccess

A set of lexical reads. This instruction represents reads of a set of variables that are defined by a pair of variable name and defining code body (i.e. a method or function). This instruction has one local value number definition for each lexical read, and the call graph builder ensures that these value numbers are kept consistent as lexical uses and definitions are discovered during call graph construction.

Author:

Julian Dolby (dolby@us.ibm.com)

Nested Class Summary

Nested classes/interfaces inherited from class AstLexicalAccess

AstLexicalAccess.Access

Nested classes/interfaces inherited from class SSAInstruction

SSAInstruction.IVisitor, SSAInstruction.Visitor

Field Summary

Fields inherited from class SSAInstruction

NO_INDEX

Constructor Summary

Constructors

Constructor	Description
AstLexicalRead(int iindex, int lhs, String definer, String globalName, TypeReference type)
AstLexicalRead(int iindex, AstLexicalAccess.Access access)
AstLexicalRead(int iindex, AstLexicalAccess.Access[] accesses)

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.
int	getDef(int i)	Return the ith def
int	getNumberOfDefs()
int	getUse(int i)
String	toString(SymbolTable symbolTable)
void	visit(SSAInstruction.IVisitor v)	Apply an IVisitor to this instruction.

Methods inherited from class AstLexicalAccess

getAccess, getAccessCount, getAccesses, getExceptionTypes, hashCode, isFallThrough, setAccesses

Methods inherited from class SSAInstruction

equals, getDef, getNumberOfUses, getValueString, hasDef, iIndex, isPEI, setInstructionIndex, toString

Methods inherited from class Object

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

Constructor Details

AstLexicalRead

public AstLexicalRead(int iindex,
 AstLexicalAccess.Access[] accesses)

AstLexicalRead

public AstLexicalRead(int iindex,
 AstLexicalAccess.Access access)

AstLexicalRead

public AstLexicalRead(int iindex,
 int lhs,
 String definer,
 String globalName,
 TypeReference type)

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

Specified by:

copyForSSA in class SSAInstruction

getNumberOfDefs

public int getNumberOfDefs()

Overrides:

getNumberOfDefs in class SSAInstruction

getDef

public int getDef(int i)

Description copied from class: SSAInstruction

Return the ith def

Overrides:

getDef in class SSAInstruction

Parameters:

i - number of the def, starting at 0.

getUse

public int getUse(int i)

Overrides:

getUse in class SSAInstruction

Returns:

value number representing the jth use in this instruction. -1 means TOP (i.e., the value doesn't matter)

toString

public String toString(SymbolTable symbolTable)

Specified by:

toString in class SSAInstruction

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.

Specified by:

visit in class SSAInstruction