org.multijava.util.classfile
Class CodeEnv

java.lang.Object
  org.multijava.util.classfile.CodeEnv

final class CodeEnv

extends Object

This class represent the code environement during control flow This allow to compute the amount of stack consumed, to check if instructions are reached and so on

Field Summary
private  CodeInfo	codeInfo
private  InstructionHandle	methodStart

 

Constructor Summary
private	CodeEnv(CodeInfo codeInfo)           Constructs a new CodeEnv structure.

 

Method Summary
static void	check(CodeInfo codeInfo)           Checks the specified CodeInfo structure and computes maxStack and maxLocals.
(package private)  void	checkExecutionPath(InstructionHandle handle, int curStack)           Verifies execution path(s) starting at specified instruction.
private  void	checkExecutionPaths()           Verifies all possible execution path(s).
private  void	computeCodeLength()           Computes size and sets address of each instruction in the code array.
private  void	computeStackAndLocals()           Computes max stack and max locals.
(package private)  void	dumpCode()
private  void	installInstructionHandles()           Install handles around instructions.
private  void	removeInstructionHandles()           Replaces handles by associated instructions.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

codeInfo

private final CodeInfo codeInfo

methodStart

private InstructionHandle methodStart

CodeEnv

private CodeEnv(CodeInfo codeInfo)

Constructs a new CodeEnv structure.

check

public static void check(CodeInfo codeInfo)
                  throws ClassFileFormatException

Checks the specified CodeInfo structure and computes maxStack and maxLocals.

Throws:

ClassFileFormatException

checkExecutionPaths

private final void checkExecutionPaths()
                                throws ClassFileFormatException

Verifies all possible execution path(s).

Throws:

ClassFileFormatException

checkExecutionPath

final void checkExecutionPath(InstructionHandle handle,
                              int curStack)
                       throws ClassFileFormatException

Verifies execution path(s) starting at specified instruction.

Parameters:

handle - the handle of the first instruction

curStack - the stack height at the beginning of the execution of the instruction

Throws:

ClassFileFormatException - a problem was detected

computeCodeLength

private final void computeCodeLength()

Computes size and sets address of each instruction in the code array.

computeStackAndLocals

private final void computeStackAndLocals()

Computes max stack and max locals.

installInstructionHandles

private void installInstructionHandles()

Install handles around instructions.

removeInstructionHandles

private void removeInstructionHandles()

Replaces handles by associated instructions.

dumpCode

void dumpCode()