Package org.codehaus.groovy.classgen.asm

Class BytecodeHelper

java.lang.Object
org.codehaus.groovy.classgen.asm.BytecodeHelper
All Implemented Interfaces:
org.objectweb.asm.Opcodes
public class BytecodeHelper
extends Object
implements org.objectweb.asm.Opcodes
A helper class for bytecode generation with AsmClassGenerator.

  • Field Summary

    Fields inherited from interface org.objectweb.asm.Opcodes

    AALOAD, AASTORE, ACC_ABSTRACT, ACC_ANNOTATION, ACC_BRIDGE, ACC_DEPRECATED, ACC_ENUM, ACC_FINAL, ACC_INTERFACE, ACC_MANDATED, ACC_MODULE, ACC_NATIVE, ACC_OPEN, ACC_PRIVATE, ACC_PROTECTED, ACC_PUBLIC, ACC_RECORD, ACC_STATIC, ACC_STATIC_PHASE, ACC_STRICT, ACC_SUPER, ACC_SYNCHRONIZED, ACC_SYNTHETIC, ACC_TRANSIENT, ACC_TRANSITIVE, ACC_VARARGS, ACC_VOLATILE, ACONST_NULL, ALOAD, ANEWARRAY, ARETURN, ARRAYLENGTH, ASM10_EXPERIMENTAL, ASM4, ASM5, ASM6, ASM7, ASM8, ASM9, ASTORE, ATHROW, BALOAD, BASTORE, BIPUSH, CALOAD, CASTORE, CHECKCAST, D2F, D2I, D2L, DADD, DALOAD, DASTORE, DCMPG, DCMPL, DCONST_0, DCONST_1, DDIV, DLOAD, DMUL, DNEG, DOUBLE, DREM, DRETURN, DSTORE, DSUB, DUP, DUP_X1, DUP_X2, DUP2, DUP2_X1, DUP2_X2, F_APPEND, F_CHOP, F_FULL, F_NEW, F_SAME, F_SAME1, F2D, F2I, F2L, FADD, FALOAD, FASTORE, FCMPG, FCMPL, FCONST_0, FCONST_1, FCONST_2, FDIV, FLOAD, FLOAT, FMUL, FNEG, FREM, FRETURN, FSTORE, FSUB, GETFIELD, GETSTATIC, GOTO, H_GETFIELD, H_GETSTATIC, H_INVOKEINTERFACE, H_INVOKESPECIAL, H_INVOKESTATIC, H_INVOKEVIRTUAL, H_NEWINVOKESPECIAL, H_PUTFIELD, H_PUTSTATIC, I2B, I2C, I2D, I2F, I2L, I2S, IADD, IALOAD, IAND, IASTORE, ICONST_0, ICONST_1, ICONST_2, ICONST_3, ICONST_4, ICONST_5, ICONST_M1, IDIV, IF_ACMPEQ, IF_ACMPNE, IF_ICMPEQ, IF_ICMPGE, IF_ICMPGT, IF_ICMPLE, IF_ICMPLT, IF_ICMPNE, IFEQ, IFGE, IFGT, IFLE, IFLT, IFNE, IFNONNULL, IFNULL, IINC, ILOAD, IMUL, INEG, INSTANCEOF, INTEGER, INVOKEDYNAMIC, INVOKEINTERFACE, INVOKESPECIAL, INVOKESTATIC, INVOKEVIRTUAL, IOR, IREM, IRETURN, ISHL, ISHR, ISTORE, ISUB, IUSHR, IXOR, JSR, L2D, L2F, L2I, LADD, LALOAD, LAND, LASTORE, LCMP, LCONST_0, LCONST_1, LDC, LDIV, LLOAD, LMUL, LNEG, LONG, LOOKUPSWITCH, LOR, LREM, LRETURN, LSHL, LSHR, LSTORE, LSUB, LUSHR, LXOR, MONITORENTER, MONITOREXIT, MULTIANEWARRAY, NEW, NEWARRAY, NOP, NULL, POP, POP2, PUTFIELD, PUTSTATIC, RET, RETURN, SALOAD, SASTORE, SIPUSH, SOURCE_DEPRECATED, SOURCE_MASK, SWAP, T_BOOLEAN, T_BYTE, T_CHAR, T_DOUBLE, T_FLOAT, T_INT, T_LONG, T_SHORT, TABLESWITCH, TOP, UNINITIALIZED_THIS, V_PREVIEW, V1_1, V1_2, V1_3, V1_4, V1_5, V1_6, V1_7, V1_8, V10, V11, V12, V13, V14, V15, V16, V17, V18, V9

  • Constructor Summary

    Constructors 
    Constructor Description
    BytecodeHelper()  

  • Method Summary

    Modifier and Type Method Description
    static boolean box​(org.objectweb.asm.MethodVisitor mv, Class type)
    Deprecated.
    static boolean box​(org.objectweb.asm.MethodVisitor mv, ClassNode type)
    Deprecated.
    static void convertPrimitiveToBoolean​(org.objectweb.asm.MethodVisitor mv, ClassNode type)
    Converts a primitive type to boolean.
    static void doCast​(org.objectweb.asm.MethodVisitor mv, Class type)  
    static void doCast​(org.objectweb.asm.MethodVisitor mv, ClassNode type)  
    static void doCastToPrimitive​(org.objectweb.asm.MethodVisitor mv, ClassNode sourceType, ClassNode targetType)
    Given a wrapped number type (Byte, Integer, Short, ...), generates bytecode to convert it to a primitive number (int, long, double) using calls to wrapped.[targetType]Value()
    static void doCastToWrappedType​(org.objectweb.asm.MethodVisitor mv, ClassNode sourceType, ClassNode targetType)
    Given a primitive number type (byte, integer, short, ...), generates bytecode to convert it to a wrapped number (Integer, Long, Double) using calls to [WrappedType].valueOf
    static void doReturn​(org.objectweb.asm.MethodVisitor mv, ClassNode type)  
    static String formatNameForClassLoading​(String name)
    returns a name that Class.forName() can take.
    static String getClassInternalName​(Class t)  
    static String getClassInternalName​(String name)  
    static String getClassInternalName​(ClassNode t)  
    static String[] getClassInternalNames​(ClassNode[] names)  
    static String getClassLoadingTypeDescription​(ClassNode c)
    array types are special: eg.: String[]: classname: [Ljava.lang.String; Object: classname: java.lang.Object int[] : classname: [I unlike getTypeDescription '.' is not replaced by '/'.
    static String getGenericsBounds​(ClassNode type)  
    static String getGenericsMethodSignature​(MethodNode node)  
    static String getGenericsSignature​(ClassNode node)  
    static String getMethodDescriptor​(Class returnType, Class[] paramTypes)  
    static String getMethodDescriptor​(ClassNode returnType, ClassNode[] parameterTypes)  
    static String getMethodDescriptor​(ClassNode returnType, Parameter[] parameters)  
    static String getMethodDescriptor​(MethodNode methodNode)
    Returns a method descriptor for the given MethodNode.
    static String getTypeDescription​(Class c)  
    static String getTypeDescription​(ClassNode c)
    array types are special: eg.: String[]: classname: [Ljava/lang/String; int[]: [I
    static int hashCode​(String str)
    Computes a hash code for a string.
    static boolean isClassLiteralPossible​(ClassNode classNode)
    Tells if a class node is candidate for class literal bytecode optimization.
    static boolean isSameCompilationUnit​(ClassNode a, ClassNode b)
    Returns true if the two classes share the same compilation unit.
    static void load​(org.objectweb.asm.MethodVisitor mv, ClassNode type, int idx)  
    static void negateBoolean​(org.objectweb.asm.MethodVisitor mv)
    Negate a boolean on stack.
    static void pushConstant​(org.objectweb.asm.MethodVisitor mv, int value)  
    static void store​(org.objectweb.asm.MethodVisitor mv, ClassNode type, int idx)  
    static void unbox​(org.objectweb.asm.MethodVisitor mv, Class type)
    Generates the bytecode to unbox the current value on the stack.
    static void unbox​(org.objectweb.asm.MethodVisitor mv, ClassNode type)
    Generates the bytecode to unbox the current value on the stack.
    static void visitClassLiteral​(org.objectweb.asm.MethodVisitor mv, ClassNode classNode)
    Visits a class literal.

    Methods inherited from class java.lang.Object

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

  • Constructor Details

  • Method Details

    • getClassInternalName

      public static String getClassInternalName​(ClassNode t)
      Returns:
      the ASM internal name of the type

    • getClassInternalName

      public static String getClassInternalName​(Class t)
      Returns:
      the ASM internal name of the type

    • getClassInternalName

      public static String getClassInternalName​(String name)
      Returns:
      the ASM internal name of the type

    • getMethodDescriptor

      public static String getMethodDescriptor​(MethodNode methodNode)
      Returns a method descriptor for the given MethodNode.
      Parameters:
      methodNode - the method node for which to create the descriptor
      Returns:
      a method descriptor as defined in section JVMS section 4.3.3

    • getMethodDescriptor

      public static String getMethodDescriptor​(ClassNode returnType, Parameter[] parameters)
      Returns:
      the ASM method type descriptor

    • getMethodDescriptor

      public static String getMethodDescriptor​(ClassNode returnType, ClassNode[] parameterTypes)
      Returns:
      the ASM method type descriptor

    • getMethodDescriptor

      public static String getMethodDescriptor​(Class returnType, Class[] paramTypes)
      Returns:
      the ASM method type descriptor

    • getClassLoadingTypeDescription

      public static String getClassLoadingTypeDescription​(ClassNode c)
      array types are special: eg.: String[]: classname: [Ljava.lang.String; Object: classname: java.lang.Object int[] : classname: [I unlike getTypeDescription '.' is not replaced by '/'. it seems that makes problems for the class loading if '.' is replaced by '/'
      Returns:
      the ASM type description for class loading

    • getTypeDescription

      public static String getTypeDescription​(Class c)

    • getTypeDescription

      public static String getTypeDescription​(ClassNode c)
      array types are special: eg.: String[]: classname: [Ljava/lang/String; int[]: [I
      Returns:
      the ASM type description

    • getClassInternalNames

      public static String[] getClassInternalNames​(ClassNode[] names)
      Returns:
      an array of ASM internal names of the type

    • pushConstant

      public static void pushConstant​(org.objectweb.asm.MethodVisitor mv, int value)

    • negateBoolean

      public static void negateBoolean​(org.objectweb.asm.MethodVisitor mv)
      Negate a boolean on stack.

    • formatNameForClassLoading

      public static String formatNameForClassLoading​(String name)
      returns a name that Class.forName() can take. Notably for arrays: [I, [Ljava.lang.String; etc Regular object type: java.lang.String

    • getGenericsMethodSignature

      public static String getGenericsMethodSignature​(MethodNode node)

    • getGenericsSignature

      public static String getGenericsSignature​(ClassNode node)

    • getGenericsBounds

      public static String getGenericsBounds​(ClassNode type)

    • doCast

      public static void doCast​(org.objectweb.asm.MethodVisitor mv, ClassNode type)

    • doCastToPrimitive

      public static void doCastToPrimitive​(org.objectweb.asm.MethodVisitor mv, ClassNode sourceType, ClassNode targetType)
      Given a wrapped number type (Byte, Integer, Short, ...), generates bytecode to convert it to a primitive number (int, long, double) using calls to wrapped.[targetType]Value()
      Parameters:
      mv - method visitor
      sourceType - the wrapped number type
      targetType - the primitive target type

    • doCastToWrappedType

      public static void doCastToWrappedType​(org.objectweb.asm.MethodVisitor mv, ClassNode sourceType, ClassNode targetType)
      Given a primitive number type (byte, integer, short, ...), generates bytecode to convert it to a wrapped number (Integer, Long, Double) using calls to [WrappedType].valueOf
      Parameters:
      mv - method visitor
      sourceType - the primitive number type
      targetType - the wrapped target type

    • doCast

      public static void doCast​(org.objectweb.asm.MethodVisitor mv, Class type)

    • box

      @Deprecated public static boolean box​(org.objectweb.asm.MethodVisitor mv, ClassNode type)
      Deprecated.
      Generates the bytecode to autobox the current value on the stack.

    • box

      @Deprecated public static boolean box​(org.objectweb.asm.MethodVisitor mv, Class type)
      Deprecated.
      Generates the bytecode to autobox the current value on the stack.

    • unbox

      public static void unbox​(org.objectweb.asm.MethodVisitor mv, ClassNode type)
      Generates the bytecode to unbox the current value on the stack.

    • unbox

      public static void unbox​(org.objectweb.asm.MethodVisitor mv, Class type)
      Generates the bytecode to unbox the current value on the stack.

    • visitClassLiteral

      public static void visitClassLiteral​(org.objectweb.asm.MethodVisitor mv, ClassNode classNode)
      Visits a class literal. If the type of the classnode is a primitive type, the generated bytecode will be a GETSTATIC Integer.TYPE. If the classnode is not a primitive type, we will generate a LDC instruction.

    • isClassLiteralPossible

      public static boolean isClassLiteralPossible​(ClassNode classNode)
      Tells if a class node is candidate for class literal bytecode optimization. If so, bytecode may use LDC instructions instead of static constant Class fields to retrieve class literals.
      Parameters:
      classNode - the classnode for which we want to know if bytecode optimization is possible
      Returns:
      true if the bytecode can be optimized

    • isSameCompilationUnit

      public static boolean isSameCompilationUnit​(ClassNode a, ClassNode b)
      Returns true if the two classes share the same compilation unit.
      Parameters:
      a - class a
      b - class b
      Returns:
      true if both classes share the same compilation unit

    • hashCode

      public static int hashCode​(String str)
      Computes a hash code for a string. The purpose of this hashcode is to be constant independently of the JDK being used.
      Parameters:
      str - the string for which to compute the hashcode
      Returns:
      hashcode of the string

    • convertPrimitiveToBoolean

      public static void convertPrimitiveToBoolean​(org.objectweb.asm.MethodVisitor mv, ClassNode type)
      Converts a primitive type to boolean.
      Parameters:
      mv - method visitor
      type - primitive type to convert

    • doReturn

      public static void doReturn​(org.objectweb.asm.MethodVisitor mv, ClassNode type)

    • load

      public static void load​(org.objectweb.asm.MethodVisitor mv, ClassNode type, int idx)

    • store

      public static void store​(org.objectweb.asm.MethodVisitor mv, ClassNode type, int idx)