java.lang.Object
- org.jboss.classfilewriter.code.StackFrame

```
public class StackFrame
extends Object
```
Represents a stack frame in the virtual machine. Holds the state of the local variable array and the stack

Author:

Stuart Douglas

Constructor Summary

Constructors
Constructor	Description
`StackFrame(ClassMethod method)`	Creates the initial stack frame
`StackFrame(StackState stackState, LocalVariableState localVariableState, StackFrameType type)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`StackFrame`	`aconstNull()`	pushes a null type onto the stack
`StackFrame`	`constructorCall(int initializedValueStackPosition)`	marks the value in potition initializedValueStackPosition as initialized.
`StackFrame`	`createFull()`
`StackFrame`	`dup()`
`StackFrame`	`dup2()`
`StackFrame`	`dup2X1()`
`StackFrame`	`dup2X2()`
`StackFrame`	`dupX1()`
`StackFrame`	`dupX2()`
`LocalVariableState`	`getLocalVariableState()`
`StackState`	`getStackState()`
`StackFrameType`	`getType()`
`StackFrame`	`mergeLocals(int pos, StackEntry frame)`
`StackFrame`	`mergeStack(int pos, StackEntry frame)`
`StackFrame`	`pop()`	pops an operand from the stack
`StackFrame`	`pop(int no)`
`StackFrame`	`pop2()`	pops 2 operands from the stack
`StackFrame`	`pop2push1(String type)`	remote the top two operands and replace them with an different operand
`StackFrame`	`pop3()`	pops 3 operands from the stack
`StackFrame`	`pop4()`	pops 4 operands from the stack
`StackFrame`	`pop4push1(String type)`	remote the top two operands and replace them with an different operand
`StackFrame`	`push(String type)`	push an operand of the given type onto the stack
`StackFrame`	`push(StackEntry entry)`	push an operand of the given type onto the stack.
`StackFrame`	`replace(String type)`	replace the operand at the top of the stack with the given operand
`StackFrame`	`store(int no)`	Store the variable on top of the stack into a local variable, poping the variable from the stack.
`StackFrame`	`swap()`
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

StackFrame

public StackFrame(ClassMethod method)

Creates the initial stack frame

StackFrame

public StackFrame(StackState stackState,
                  LocalVariableState localVariableState,
                  StackFrameType type)

Method Detail

getStackState
```
public StackState getStackState()
```

getLocalVariableState

public LocalVariableState getLocalVariableState()

push
```
public StackFrame push(String type)
```
push an operand of the given type onto the stack
If the entry is wide then a corresponding TOP type will be created

push
```
public StackFrame push(StackEntry entry)
```
push an operand of the given type onto the stack.
If the entry is wide then a corresponding TOP type will be created

aconstNull
```
public StackFrame aconstNull()
```
pushes a null type onto the stack

Returns:

pop
```
public StackFrame pop(int no)
```

pop
```
public StackFrame pop()
```
pops an operand from the stack

pop2
```
public StackFrame pop2()
```
pops 2 operands from the stack

pop3
```
public StackFrame pop3()
```
pops 3 operands from the stack

pop4
```
public StackFrame pop4()
```
pops 4 operands from the stack

replace
```
public StackFrame replace(String type)
```
replace the operand at the top of the stack with the given operand

dup
```
public StackFrame dup()
```

dupX1
```
public StackFrame dupX1()
```

dupX2
```
public StackFrame dupX2()
```

dup2
```
public StackFrame dup2()
```

dup2X1
```
public StackFrame dup2X1()
```

dup2X2
```
public StackFrame dup2X2()
```

store
```
public StackFrame store(int no)
```
Store the variable on top of the stack into a local variable, poping the variable from the stack. Wide types are handled automatically

pop2push1
```
public StackFrame pop2push1(String type)
```
remote the top two operands and replace them with an different operand

pop4push1
```
public StackFrame pop4push1(String type)
```
remote the top two operands and replace them with an different operand

toString
```
public String toString()
```
Overrides:

toString in class Object

constructorCall
```
public StackFrame constructorCall(int initializedValueStackPosition)
```
marks the value in potition initializedValueStackPosition as initialized. This also pops this value and everything above it

swap
```
public StackFrame swap()
```

mergeStack

public StackFrame mergeStack(int pos,
                             StackEntry frame)

mergeLocals

public StackFrame mergeLocals(int pos,
                              StackEntry frame)

getType
```
public StackFrameType getType()
```

createFull
```
public StackFrame createFull()
```

Class StackFrame

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

StackFrame

StackFrame

Method Detail

getStackState

getLocalVariableState

push

push

aconstNull

pop

pop

pop2

pop3

pop4

replace

dup

dupX1

dupX2

dup2

dup2X1

dup2X2

store

pop2push1

pop4push1

toString

constructorCall

swap

mergeStack

mergeLocals

getType

createFull