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org.apache.derby.impl.services.bytecode
Class CodeChunk  

java.lang.Object
  org.apache.derby.impl.services.bytecode.CodeChunk

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class CodeChunk

extends java.lang.Object

This class represents a chunk of code in a CodeAttribute. Typically, a CodeAttribute represents the code in a method. If there is a try/catch block, each catch block will get its own code chunk. This allows the catch blocks to all be put at the end of the generated code for a method, which eliminates the need to generate a jump around each catch block, which would be a forward reference.

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Field Summary
(package private) static short[]	ARRAY_ACCESS
(package private) static short[]	ARRAY_STORE
(package private) static short[][][]	CAST_CONVERSION_INFO
private  int	codeOffset
private  org.apache.derby.iapi.services.classfile.ClassFormatOutput	cout
(package private) static short[]	LOAD_VARIABLE
(package private) static short[]	LOAD_VARIABLE_FAST
(package private) static short[]	RETURN_OPCODE
(package private) static short[]	STORE_VARIABLE
(package private) static short[]	STORE_VARIABLE_FAST

 

Constructor Summary
(package private)	CodeChunk(boolean main)

 

Method Summary
(package private)  void	addChunk(CodeChunk other)           Add an arbitrary array of bytes
(package private)  void	addInstr(short opcode)           Add an instruction that has no opcodes.
(package private)  void	addInstrCPE(short opcode, int cpeNum)           This takes an instruction that has a narrow and a wide form for CPE access, and generates accordingly the right one.
(package private)  void	addInstrU1(short opcode, int operand)
(package private)  void	addInstrU2(short opcode, int operand)
(package private)  void	addInstrU2U1U1(short opcode, int operand1, short operand2, short operand3)           For adding an instruction with 3 operands, a U2 and two U1's.
(package private)  void	addInstrWide(short opcode, int varNum)           This takes an instruction that can be wrapped in a wide for large variable #s and does so.
(package private)  void	complete(org.apache.derby.iapi.services.classfile.ClassHolder ch, org.apache.derby.iapi.services.classfile.ClassMember method, int maxStack, int maxLocals)           wrap up the entry and stuff it in the class, now that it holds all of the instructions and the exception table.
(package private)  void	fixLengths(int maxStack, int maxLocals, int codeLength)           now that we have codeBytes, fix the lengths fields in it to reflect what was stored.
(package private)  org.apache.derby.iapi.services.classfile.ClassFormatOutput	getCout()           Get the ClassFormatOutput
int	getRelativePC()           Get the current PC

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

LOAD_VARIABLE

static final short[] LOAD_VARIABLE

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LOAD_VARIABLE_FAST

static final short[] LOAD_VARIABLE_FAST

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STORE_VARIABLE

static final short[] STORE_VARIABLE

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STORE_VARIABLE_FAST

static final short[] STORE_VARIABLE_FAST

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ARRAY_ACCESS

static final short[] ARRAY_ACCESS

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ARRAY_STORE

static final short[] ARRAY_STORE

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RETURN_OPCODE

static final short[] RETURN_OPCODE

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CAST_CONVERSION_INFO

static final short[][][] CAST_CONVERSION_INFO

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codeOffset

private int codeOffset

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cout

private final org.apache.derby.iapi.services.classfile.ClassFormatOutput cout

Constructor Detail

CodeChunk

CodeChunk(boolean main)

Method Detail

addInstr

void addInstr(short opcode)

Add an instruction that has no opcodes. All instructions are 1 byte large.

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addInstrU2

void addInstrU2(short opcode,
                int operand)

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addInstrU1

void addInstrU1(short opcode,
                int operand)

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addInstrCPE

void addInstrCPE(short opcode,
                 int cpeNum)

This takes an instruction that has a narrow and a wide form for CPE access, and generates accordingly the right one. We assume the narrow instruction is what we were given, and that the wide form is the next possible instruction.

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addInstrWide

void addInstrWide(short opcode,
                  int varNum)

This takes an instruction that can be wrapped in a wide for large variable #s and does so. REVISIT: could hide this in addInstrU2?

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addInstrU2U1U1

void addInstrU2U1U1(short opcode,
                    int operand1,
                    short operand2,
                    short operand3)

For adding an instruction with 3 operands, a U2 and two U1's. So far, this is used by VMOpcode.INVOKEINTERFACE.

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addChunk

void addChunk(CodeChunk other)

Add an arbitrary array of bytes

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getCout

org.apache.derby.iapi.services.classfile.ClassFormatOutput getCout()

Get the ClassFormatOutput

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getRelativePC

public int getRelativePC()

Get the current PC

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fixLengths

void fixLengths(int maxStack,
                int maxLocals,
                int codeLength)

now that we have codeBytes, fix the lengths fields in it to reflect what was stored.

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complete

void complete(org.apache.derby.iapi.services.classfile.ClassHolder ch,
              org.apache.derby.iapi.services.classfile.ClassMember method,
              int maxStack,
              int maxLocals)

wrap up the entry and stuff it in the class, now that it holds all of the instructions and the exception table.

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> org >> apache >> derby >> impl >> services >> [ bytecode overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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