程序包 org.beetl.ow2.asm.tree.analysis

类 Analyzer<V extends Value>

java.lang.Object
org.beetl.ow2.asm.tree.analysis.Analyzer<V>
类型参数:
V - type of the Value used for the analysis.
所有已实现的接口:
Opcodes
public class Analyzer<V extends Value> extends Object implements Opcodes
A semantic bytecode analyzer. This class does not fully check that JSR and RET instructions are valid.
作者:
Eric Bruneton

  • 构造器详细资料

    • Analyzer

      public Analyzer(Interpreter<V> interpreter)
      Constructs a new Analyzer.
      参数:
      interpreter - the interpreter to be used to symbolically interpret the bytecode instructions.

  • 方法详细资料

    • analyze

      public Frame<V>[] analyze(String owner, MethodNode m) throws AnalyzerException
      Analyzes the given method.
      参数:
      owner - the internal className of the class to which the method belongs.
      m - the method to be analyzed.
      返回:
      the symbolic state of the execution stack frame at each bytecode instruction of the method. The size of the returned array is equal to the number of instructions (and labels) of the method. A given frame is null if and only if the corresponding instruction cannot be reached (dead code).
      抛出:
      AnalyzerException - if a problem occurs during the analysis.

    • getFrames

      public Frame<V>[] getFrames()
      Returns the symbolic stack frame for each instruction of the last recently analyzed method.
      返回:
      the symbolic state of the execution stack frame at each bytecode instruction of the method. The size of the returned array is equal to the number of instructions (and labels) of the method. A given frame is null if the corresponding instruction cannot be reached, or if an error occured during the analysis of the method.

    • getHandlers

      public List<TryCatchBlockNode> getHandlers(int insn)
      Returns the exception handlers for the given instruction.
      参数:
      insn - the index of an instruction of the last recently analyzed method.
      返回:
      a list of TryCatchBlockNode objects.

    • init

      protected void init(String owner, MethodNode m) throws AnalyzerException
      Initializes this analyzer. This method is called just before the execution of control flow analysis loop in #analyze. The default implementation of this method does nothing.
      参数:
      owner - the internal className of the class to which the method belongs.
      m - the method to be analyzed.
      抛出:
      AnalyzerException - if a problem occurs.

    • newFrame

      protected Frame<V> newFrame(int nLocals, int nStack)
      Constructs a new frame with the given size.
      参数:
      nLocals - the maximum number of local variables of the frame.
      nStack - the maximum stack size of the frame.
      返回:
      the created frame.

    • newFrame

      protected Frame<V> newFrame(Frame<? extends V> src)
      Constructs a new frame that is identical to the given frame.
      参数:
      src - a frame.
      返回:
      the created frame.

    • newControlFlowEdge

      protected void newControlFlowEdge(int insn, int successor)
      Creates a control flow graph edge. The default implementation of this method does nothing. It can be overriden in order to construct the control flow graph of a method (this method is called by the analyze method during its visit of the method's code).
      参数:
      insn - an instruction index.
      successor - index of a successor instruction.

    • newControlFlowExceptionEdge

      protected boolean newControlFlowExceptionEdge(int insn, int successor)
      Creates a control flow graph edge corresponding to an exception handler. The default implementation of this method does nothing. It can be overridden in order to construct the control flow graph of a method (this method is called by the analyze method during its visit of the method's code).
      参数:
      insn - an instruction index.
      successor - index of a successor instruction.
      返回:
      true if this edge must be considered in the data flow analysis performed by this analyzer, or false otherwise. The default implementation of this method always returns true.

    • newControlFlowExceptionEdge

      protected boolean newControlFlowExceptionEdge(int insn, TryCatchBlockNode tcb)
      Creates a control flow graph edge corresponding to an exception handler. The default implementation of this method delegates to newControlFlowExceptionEdge(int, int). It can be overridden in order to construct the control flow graph of a method (this method is called by the analyze method during its visit of the method's code).
      参数:
      insn - an instruction index.
      tcb - TryCatchBlockNode corresponding to this edge.
      返回:
      true if this edge must be considered in the data flow analysis performed by this analyzer, or false otherwise. The default implementation of this method delegates to newControlFlowExceptionEdge(int, int).