Package serp.bytecode
Class LoadInstruction
- java.lang.Object
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- serp.bytecode.Instruction
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- serp.bytecode.TypedInstruction
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- serp.bytecode.LocalVariableInstruction
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- serp.bytecode.LoadInstruction
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- All Implemented Interfaces:
BCEntity
,VisitAcceptor
public class LoadInstruction extends LocalVariableInstruction
Loads a value from the locals table to the stack.- 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.boolean
equalsInstruction(Instruction other)
LoadInstructions are equal if the type they reference the same type and locals index or if either is unset.int
getLogicalStackChange()
Return the logical number of stack positions changed by this instruction.int
getStackChange()
Return the number of stack positions this instruction pushes or pops during its execution.java.lang.String
getTypeName()
Return the type name for this instruction.boolean
isThis()
Equivalent togetLocal () == 0 && getType () == Object.class
; thethis
ptr is always passed in local variable 0.LoadInstruction
setThis()
Equivalent tosetLocal (0).setType (Object.class)
; thethis
ptr is always passed in local variable 0.TypedInstruction
setType(java.lang.String type)
Set the type of this instruction.-
Methods inherited from class serp.bytecode.LocalVariableInstruction
getLocal, getLocalVariable, getParam, setLocal, setLocalVariable, setParam
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Methods inherited from class serp.bytecode.TypedInstruction
getType, getTypeBC, setType, setType
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Methods inherited from class serp.bytecode.Instruction
getByteIndex, getClassLoader, getCode, getLineNumber, 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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getLogicalStackChange
public int getLogicalStackChange()
Description copied from class:Instruction
Return the logical number of stack positions changed by this instruction. In other words, ignore weirdness with longs and doubles taking two stack positions.- Overrides:
getLogicalStackChange
in classInstruction
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getTypeName
public java.lang.String getTypeName()
Description copied from class:TypedInstruction
Return the type name for this instruction. If the type has not been set, this method will return null.- Overrides:
getTypeName
in classLocalVariableInstruction
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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.- Overrides:
setType
in classLocalVariableInstruction
- Returns:
- this instruction, for method chaining
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setThis
public LoadInstruction setThis()
Equivalent tosetLocal (0).setType (Object.class)
; thethis
ptr is always passed in local variable 0.- Returns:
- this instruction, for method chaining
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isThis
public boolean isThis()
Equivalent togetLocal () == 0 && getType () == Object.class
; thethis
ptr is always passed in local variable 0.
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equalsInstruction
public boolean equalsInstruction(Instruction other)
LoadInstructions are equal if the type they reference the same type and locals index or if either is unset.- Overrides:
equalsInstruction
in classLocalVariableInstruction
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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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