Package com.ibm.wala.core.util.ssa

Class TypeSafeInstructionFactory

java.lang.Object

com.ibm.wala.core.util.ssa.TypeSafeInstructionFactory

public class TypeSafeInstructionFactory
extends Object

Intended for SyntheticMethods, uses JavaInstructionFactory.

As the name states this SSAInstructionFactory does type checks. If they pass the actual instructions are generated using the JavaInstructionFactory.

Obviously this factory is not complete yet. It's extended on demand.

Since:

2013-10-20

Author:

Tobias Blaschke <code@tobiasblaschke.de>

See Also:

• JavaLanguage.JavaInstructionFactory

Field Summary

Fields

Modifier and Type	Field	Description
protected final IClassHierarchy	cha
protected final JavaLanguage.JavaInstructionFactory	insts

Constructor Summary

Constructors

Constructor	Description
TypeSafeInstructionFactory(IClassHierarchy cha)

Method Summary

Modifier and Type	Method	Description
SSAArrayLoadInstruction	ArrayLoadInstruction(int iindex, SSAValue result, SSAValue array, int index)	result = array[index].
SSAArrayStoreInstruction	ArrayStoreInstruction(int iindex, SSAValue array, int index, SSAValue value)	array[index] = value.
SSAConditionalBranchInstruction	ConditionalBranchInstruction(int iindex, IConditionalBranchInstruction.IOperator operator, TypeReference type, int val1, int val2, int target)
SSAGetInstruction	GetInstruction(int iindex, SSAValue targetValue, SSAValue containingInstance, FieldReference field)	targetValue = containingInstance.field.
SSAGetInstruction	GetInstruction(int iindex, SSAValue targetValue, FieldReference field)	Reads static field into targetValue.
SSAGotoInstruction	GotoInstruction(int iindex, int target)	Unconditionally jump to a (non-Phi) Instruction.
SSAAbstractInvokeInstruction	InvokeInstruction(int iindex, SSAValue result, List<? extends SSAValue> params, SSAValue exception, CallSiteReference site)	result = site(params).
SSAAbstractInvokeInstruction	InvokeInstruction(int iindex, List<? extends SSAValue> params, SSAValue exception, CallSiteReference site)	Instruction that calls a void-method.
boolean	isAssignableFrom(TypeReference from, TypeReference to)
SSANewInstruction	NewInstruction(int iindex, SSAValue result, NewSiteReference site)
SSANewInstruction	NewInstruction(int iindex, SSAValue result, NewSiteReference site, Collection<? extends SSAValue> params)
SSAPhiInstruction	PhiInstruction(int iindex, SSAValue result, Collection<? extends SSAValue> params)	Combine SSA-Values into a newone.
SSAPutInstruction	PutInstruction(int iindex, SSAValue targetInstance, SSAValue newValue, FieldReference field)	Writes newValue to field of targetInstance.
SSAPutInstruction	PutInstruction(int iindex, SSAValue newValue, FieldReference field)	Writes newValue to static field.
SSAReturnInstruction	ReturnInstruction(int iindex)	Return from a void-function.
SSAReturnInstruction	ReturnInstruction(int iindex, SSAValue result)	Check if the type of the SSAValue is assignable to the return-value of the method it's valid in.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

insts

protected final JavaLanguage.JavaInstructionFactory insts

cha

protected final IClassHierarchy cha

Constructor Details

TypeSafeInstructionFactory

public TypeSafeInstructionFactory(IClassHierarchy cha)

Method Details

InvokeInstruction

public SSAAbstractInvokeInstruction InvokeInstruction(int iindex,
 SSAValue result,
 List<? extends SSAValue> params,
 SSAValue exception,
 CallSiteReference site)

result = site(params).

Instruction that calls a method which has a return-value.

All parameters (but exception) are typechecked first. If the check passes they get unpacked and handed over to the corresponding JavaInstructionFactory.InvokeInstruction.

Calls result.setAssigned()

Parameters:

iindex - Zero or a positive number unique to any instruction of the same method

result - Where to place the return-value of the called method. Is SSAValue.setAssigned() automatically.

params - Parameters to the call starting with the implicit this-pointer if necessary

exception - An SSAValue receiving the exception-object when something in the method throws unhandled

site - The CallSiteReference to this call.

See Also:

• JavaLanguage.JavaInstructionFactory.InvokeInstruction(int, int, int[], int, CallSiteReference, com.ibm.wala.shrike.shrikeCT.BootstrapMethodsReader.BootstrapMethod)

InvokeInstruction

public SSAAbstractInvokeInstruction InvokeInstruction(int iindex,
 List<? extends SSAValue> params,
 SSAValue exception,
 CallSiteReference site)

Instruction that calls a void-method.

All parameters (but exception) are typechecked first. If the check passes they get unpacked and handed over to the corresponding JavaInstructionFactory.InvokeInstruction.

Parameters:

iindex - Zero or a positive number unique to any instruction of the same method

params - Parameters to the call starting with the implicit this-pointer if necessary

exception - An SSAValue receiving the exception-object when something in the method throws unhandled

site - The CallSiteReference to this call.

Returns:

the invocation instruction

See Also:

• JavaLanguage.JavaInstructionFactory.InvokeInstruction(int, int[], int, CallSiteReference, com.ibm.wala.shrike.shrikeCT.BootstrapMethodsReader.BootstrapMethod)

ReturnInstruction

public SSAReturnInstruction ReturnInstruction(int iindex,
 SSAValue result)

Check if the type of the SSAValue is assignable to the return-value of the method it's valid in.

If type check passes the corresponding ReturnInstruction of the JavaInstructionFactory is called.

Parameters:

iindex - Zero or a positive number unique to any instruction of the same method

result - SSAValue to return _with_ validIn _set_!

Throws:

IllegalArgumentException - if result has no validIn set

See Also:

• JavaLanguage.JavaInstructionFactory.ReturnInstruction(int, int, boolean)

GetInstruction

public SSAGetInstruction GetInstruction(int iindex,
 SSAValue targetValue,
 SSAValue containingInstance,
 FieldReference field)

targetValue = containingInstance.field.

Reads field from containingInstance into targetValue. If type check passes the corresponding GetInstruction of the JavaInstructionFactory is called. Calls targetValue.setAssigned()

Parameters:

iindex - Zero or a positive number unique to any instruction of the same method

targetValue - the result of the GetInstruction is placed there

containingInstance - The Object instance to read the field from

field - The description of the field

See Also:

• JavaLanguage.JavaInstructionFactory.GetInstruction(int, int, int, FieldReference)

GetInstruction

public SSAGetInstruction GetInstruction(int iindex,
 SSAValue targetValue,
 FieldReference field)

Reads static field into targetValue.

If type check passes the corresponding GetInstruction of the JavaInstructionFactory is called. Calls targetValue.setAssigned()

Parameters:

iindex - Zero or a positive number unique to any instruction of the same method

targetValue - the result of the GetInstruction is placed there

field - The description of the field

See Also:

• JavaLanguage.JavaInstructionFactory.GetInstruction(int, int, int, FieldReference)

PutInstruction

public SSAPutInstruction PutInstruction(int iindex,
 SSAValue targetInstance,
 SSAValue newValue,
 FieldReference field)

Writes newValue to field of targetInstance.

If type check passes the corresponding PutInstruction of the JavaInstructionFactory is called.

Parameters:

iindex - Zero or a psitive number unique to any instruction of the same method

targetInstance - the instance of the object to write a field of

newValue - The value to write to the field

field - The description of the target

See Also:

• JavaLanguage.JavaInstructionFactory.PutInstruction(int, int, int, FieldReference)

PutInstruction

public SSAPutInstruction PutInstruction(int iindex,
 SSAValue newValue,
 FieldReference field)

Writes newValue to static field.

If type check passes the corresponding PutInstruction of the JavaInstructionFactory is called.

Parameters:

iindex - Zero or a psitive number unique to any instruction of the same method

newValue - The value to write to the field

field - The description of the target

See Also:

• JavaLanguage.JavaInstructionFactory.PutInstruction(int, int, int, FieldReference)

NewInstruction

public SSANewInstruction NewInstruction(int iindex,
 SSAValue result,
 NewSiteReference site)

NewInstruction

public SSANewInstruction NewInstruction(int iindex,
 SSAValue result,
 NewSiteReference site,
 Collection<? extends SSAValue> params)

PhiInstruction

public SSAPhiInstruction PhiInstruction(int iindex,
 SSAValue result,
 Collection<? extends SSAValue> params)

Combine SSA-Values into a newone.

If type check passes the corresponding PhiInstruction of the JavaInstructionFactory is called. Calls result.setAssigned().

Parameters:

iindex - Zero or a positive number unique to any instruction of the same method

result - Where to write result to

params - at least one SSAValue to read from

See Also:

• JavaLanguage.JavaInstructionFactory.PhiInstruction(int, int, int[])

isAssignableFrom

public boolean isAssignableFrom(TypeReference from,
 TypeReference to)

ReturnInstruction

public SSAReturnInstruction ReturnInstruction(int iindex)

Return from a void-function.

Handed through to JavaInstructionFactory directly (unless the iindex is negative).

Parameters:

iindex - Zero or a positive number unique to any instruction of the same method

GotoInstruction

public SSAGotoInstruction GotoInstruction(int iindex,
 int target)

Unconditionally jump to a (non-Phi) Instruction.

Parameters:

target - the iindex of the instruction to jump to

ConditionalBranchInstruction

public SSAConditionalBranchInstruction ConditionalBranchInstruction(int iindex,
 IConditionalBranchInstruction.IOperator operator,
 TypeReference type,
 int val1,
 int val2,
 int target)

ArrayLoadInstruction

public SSAArrayLoadInstruction ArrayLoadInstruction(int iindex,
 SSAValue result,
 SSAValue array,
 int index)

result = array[index].

Load a a reference from an array.

Parameters:

result - The SSAValue to store the loaded stuff in

array - The array to load from

index - Te position in array to load from

ArrayStoreInstruction

public SSAArrayStoreInstruction ArrayStoreInstruction(int iindex,
 SSAValue array,
 int index,
 SSAValue value)

array[index] = value.

Save a value to a specific position in an Array.

Parameters:

array - the array to store to

index - the position in the array to place value at

value - The SSAValue to store in the array