Package serp.bytecode
Class StackInstruction
- java.lang.Object
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- serp.bytecode.Instruction
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- serp.bytecode.TypedInstruction
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- serp.bytecode.StackInstruction
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- All Implemented Interfaces:
BCEntity
,VisitAcceptor
public class StackInstruction extends TypedInstruction
Represents an instruction that manipulates the stack of the current frame. Using thesetType(java.lang.String)
methods is a hint about the type being manipulated that might cause this instruction to use the wide version of the opcode it represents (if manipulating a long or double). This saves the developer from having to decide at compile time whether to usepop
orpop2
, etc.- Author:
- Abe White
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
acceptVisit(BCVisitor visit)
Accept a visit from aBCVisitor
, calling the appropriate methods to notify the visitor that it has entered this entity, and to provide it with the proper callbacks for each sub-entity owned by this one.int
getStackChange()
Return the number of stack positions this instruction pushes or pops during its execution.java.lang.String
getTypeName()
This method will always return null; useisWide()
to determine if this is pop2, dup2, etc.boolean
isWide()
Return whether to use the wide form of the current opcode for operations on longs or doubles.TypedInstruction
setType(java.lang.String type)
Set the type of this instruction.StackInstruction
setWide(boolean wide)
Set whether to use the wide form of the current opcode for operations on longs or doubles.-
Methods inherited from class serp.bytecode.TypedInstruction
getType, getTypeBC, setType, setType
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Methods inherited from class serp.bytecode.Instruction
equalsInstruction, getByteIndex, getClassLoader, getCode, getLineNumber, getLogicalStackChange, getName, getOpcode, getPool, getProject, isValid
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Method Detail
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getStackChange
public int getStackChange()
Description copied from class:Instruction
Return the number of stack positions this instruction pushes or pops during its execution.- Overrides:
getStackChange
in classInstruction
- Returns:
- 0 if the stack is not affected by this instruction, a positive number if it pushes onto the stack, and a negative number if it pops from the stack
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getTypeName
public java.lang.String getTypeName()
This method will always return null; useisWide()
to determine if this is pop2, dup2, etc.- Specified by:
getTypeName
in classTypedInstruction
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setType
public TypedInstruction setType(java.lang.String type)
Description copied from class:TypedInstruction
Set the type of this instruction. Types that have no direct support will be converted accordingly.- Specified by:
setType
in classTypedInstruction
- Returns:
- this instruction, for method chaining
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isWide
public boolean isWide()
Return whether to use the wide form of the current opcode for operations on longs or doubles.
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setWide
public StackInstruction setWide(boolean wide)
Set whether to use the wide form of the current opcode for operations on longs or doubles.- Returns:
- this instruction, for method chaining
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acceptVisit
public void acceptVisit(BCVisitor visit)
Description copied from interface:VisitAcceptor
Accept a visit from aBCVisitor
, calling the appropriate methods to notify the visitor that it has entered this entity, and to provide it with the proper callbacks for each sub-entity owned by this one.- Specified by:
acceptVisit
in interfaceVisitAcceptor
- Overrides:
acceptVisit
in classInstruction
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