Package org.apache.drill.exec.compile

Class AsmUtil

java.lang.Object
org.apache.drill.exec.compile.AsmUtil
public class AsmUtil extends Object
Utilities commonly used with ASM.

There are several class verification utilities which use CheckClassAdapter (DrillCheckClassAdapter) to ensure classes are well-formed; these are packaged as boolean functions so that they can be used in assertions.

  • Method Summary

    Modifier and Type
    Method
    Description
    static org.objectweb.asm.tree.ClassNode
    classFromBytes(byte[] classBytes, int asmReaderFlags)
    Create a ClassNode from bytecode.
    static boolean
    isClassBytesOk(org.slf4j.Logger logger, String logTag, byte[] classBytes)
    Check to see if a class is well-formed.
    static boolean
    isClassOk(org.slf4j.Logger logger, String logTag, org.objectweb.asm.tree.ClassNode classNode)
    Check to see if a class is well-formed.
    static boolean
    isXadd(int opcode)
    Determine if the given opcode is an ADD of some kind (xADD).
    static boolean
    isXconst(int opcode)
    Determine if the given opcode is a load of a constant (xCONST_y).
    static void
    logClass(org.slf4j.Logger logger, String logTag, org.objectweb.asm.tree.ClassNode classNode)
    Write a class to the log.
    static void
    logClassFromBytes(org.slf4j.Logger logger, String logTag, byte[] classBytes)
    Write a class to the log.

    Methods inherited from class java.lang.Object

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

  • Method Details

    • isClassOk

      public static boolean isClassOk(org.slf4j.Logger logger, String logTag, org.objectweb.asm.tree.ClassNode classNode)
      Check to see if a class is well-formed.
      Parameters:
      logger - the logger to write to if a problem is found
      logTag - a tag to print to the log if a problem is found
      classNode - the class to check
      Returns:
      true if the class is ok, false otherwise

    • isClassBytesOk

      public static boolean isClassBytesOk(org.slf4j.Logger logger, String logTag, byte[] classBytes)
      Check to see if a class is well-formed.
      Parameters:
      logger - the logger to write to if a problem is found
      logTag - a tag to print to the log if a problem is found
      classBytes - the bytecode of the class to check
      Returns:
      true if the class is ok, false otherwise

    • classFromBytes

      public static org.objectweb.asm.tree.ClassNode classFromBytes(byte[] classBytes, int asmReaderFlags)
      Create a ClassNode from bytecode.
      Parameters:
      classBytes - the bytecode
      asmReaderFlags - flags for ASM; see ClassReader.accept(org.objectweb.asm.ClassVisitor, int)
      Returns:
      the ClassNode

    • logClass

      public static void logClass(org.slf4j.Logger logger, String logTag, org.objectweb.asm.tree.ClassNode classNode)
      Write a class to the log.

      Writes at level TRACE.

      Parameters:
      logger - the logger to write to
      logTag - a tag to print to the log
      classNode - the class

    • logClassFromBytes

      public static void logClassFromBytes(org.slf4j.Logger logger, String logTag, byte[] classBytes)
      Write a class to the log.

      Writes at level DEBUG.

      Parameters:
      logTag - a tag to print to the log
      classBytes - the class' bytecode
      logger - the logger to write to

    • isXconst

      public static boolean isXconst(int opcode)
      Determine if the given opcode is a load of a constant (xCONST_y).
      Parameters:
      opcode - the opcode
      Returns:
      true if the opcode is one of the constant loading ones, false otherwise

    • isXadd

      public static boolean isXadd(int opcode)
      Determine if the given opcode is an ADD of some kind (xADD).
      Parameters:
      opcode - the opcode
      Returns:
      true if the opcode is one of the ADDs, false otherwise