Package serp.bytecode
Class LoadInstruction
- java.lang.Object
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- serp.bytecode.CodeEntry
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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.
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Constructor Summary
Constructors Constructor Description LoadInstruction(Code owner)
LoadInstruction(Code owner, int opcode)
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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.(package private) void
calculateLocal()
Subclasses can use this method to calculate the locals index based on their opcode.(package private) void
calculateOpcode()
Subclasses with variable opcodes can use this method to be notified that information possibly affecting the opcode has been changed.boolean
equalsInstruction(Instruction other)
LoadInstructions are equal if the type they reference the same type and locals index or if either is unset.(package private) int
getLength()
Return the length in bytes of this opcode, including all arguments.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.(package private) void
read(java.io.DataInput in)
Read the arguments for this opcode from the given stream.(package private) void
read(Instruction orig)
Copy the given instruction data.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.(package private) void
write(java.io.DataOutput out)
Write the arguments for this opcode to the given stream.-
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, mapType, setType, setType
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Methods inherited from class serp.bytecode.Instruction
getByteIndex, getClassLoader, getCode, getLineNumber, getName, getOpcode, getPool, getProject, invalidate, invalidateByteIndexes, isValid, setOpcode
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Method Detail
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getLength
int getLength()
Description copied from class:Instruction
Return the length in bytes of this opcode, including all arguments. For many opcodes this method relies on an up-to-date byte index.- Overrides:
getLength
in classInstruction
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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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read
void read(Instruction orig)
Description copied from class:Instruction
Copy the given instruction data.- Overrides:
read
in classLocalVariableInstruction
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read
void read(java.io.DataInput in) throws java.io.IOException
Description copied from class:Instruction
Read the arguments for this opcode from the given stream. This method should be overridden by opcodes that take arguments.- Overrides:
read
in classInstruction
- Throws:
java.io.IOException
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write
void write(java.io.DataOutput out) throws java.io.IOException
Description copied from class:Instruction
Write the arguments for this opcode to the given stream. This method should be overridden by opcodes that take arguments.- Overrides:
write
in classInstruction
- Throws:
java.io.IOException
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calculateOpcode
void calculateOpcode()
Description copied from class:LocalVariableInstruction
Subclasses with variable opcodes can use this method to be notified that information possibly affecting the opcode has been changed.- Overrides:
calculateOpcode
in classLocalVariableInstruction
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calculateLocal
void calculateLocal()
Description copied from class:LocalVariableInstruction
Subclasses can use this method to calculate the locals index based on their opcode.- Overrides:
calculateLocal
in classLocalVariableInstruction
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