Package serp.bytecode
Class ClassInstruction
- 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.ClassInstruction
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- All Implemented Interfaces:
BCEntity
,VisitAcceptor
- Direct Known Subclasses:
MultiANewArrayInstruction
public class ClassInstruction extends TypedInstruction
An instruction that takes as an argument a class to operate on. Examples includeanewarray, checkcast, instance, anew
, etc.
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Constructor Summary
Constructors Constructor Description ClassInstruction(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.boolean
equalsInstruction(Instruction other)
ClassInstructions are equal if the type they reference is the same or unset and if their opcodes are equal.(package private) int
getLength()
Return the length in bytes of this opcode, including all arguments.int
getStackChange()
Return the number of stack positions this instruction pushes or pops during its execution.int
getTypeIndex()
Return theConstantPool
index of theClassEntry
describing the class for this instruction.java.lang.String
getTypeName()
Return the type name for this instruction.(package private) void
read(java.io.DataInput in)
Read the arguments for this opcode from the given stream.(package private) void
read(Instruction other)
Copy the given instruction data.TypedInstruction
setType(java.lang.String type)
Set the type of this instruction.ClassInstruction
setTypeIndex(int index)
Set theConstantPool
index of theClassEntry
describing the class for 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.TypedInstruction
getType, getTypeBC, mapType, setType, setType
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Methods inherited from class serp.bytecode.Instruction
getByteIndex, getClassLoader, getCode, getLineNumber, getLogicalStackChange, getName, getOpcode, getPool, getProject, invalidate, invalidateByteIndexes, isValid, setOpcode
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Constructor Detail
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ClassInstruction
ClassInstruction(Code owner, int opcode)
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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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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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getTypeIndex
public int getTypeIndex()
Return theConstantPool
index of theClassEntry
describing the class for this instruction.
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setTypeIndex
public ClassInstruction setTypeIndex(int index)
Set theConstantPool
index of theClassEntry
describing the class for this instruction.- Returns:
- this instruction, for method chaining
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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.- 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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equalsInstruction
public boolean equalsInstruction(Instruction other)
ClassInstructions are equal if the type they reference is the same or unset and if their opcodes are equal.- Overrides:
equalsInstruction
in classInstruction
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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 other)
Description copied from class:Instruction
Copy the given instruction data.- Overrides:
read
in classInstruction
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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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