Examples of org.objectweb.asm.commons.GeneratorAdapter

org.objectweb.asm.commons.GeneratorAdapter

A {@link org.objectweb.asm.MethodVisitor} with convenient methods to generatecode. For example, using this adapter, the class below

 public class Example { public static void main(String[] args) { System.out.println("Hello world!"); } }

can be generated as follows:

 ClassWriter cw = new ClassWriter(true); cw.visit(V1_1, ACC_PUBLIC, "Example", null, "java/lang/Object", null); Method m = Method.getMethod("void <init> ()"); GeneratorAdapter mg = new GeneratorAdapter(ACC_PUBLIC, m, null, null, cw); mg.loadThis(); mg.invokeConstructor(Type.getType(Object.class), m); mg.returnValue(); mg.endMethod(); m = Method.getMethod("void main (String[])"); mg = new GeneratorAdapter(ACC_PUBLIC + ACC_STATIC, m, null, null, cw); mg.getStatic(Type.getType(System.class), "out", Type.getType(PrintStream.class)); mg.push("Hello world!"); mg.invokeVirtual(Type.getType(PrintStream.class), Method.getMethod("void println (String)")); mg.returnValue(); mg.endMethod(); cw.visitEnd();

@author Juozas Baliuka @author Chris Nokleberg @author Eric Bruneton @author Prashant Deva


  protected final void compileSubSectionTraversal( final ExpressionNodeForSubSectionModel _sub,
      final SubSectionTraversal _traversal ) throws CompilerException
  {
    final SubSectionCompiler subSection = sectionInContext().subSectionCompiler( _sub.getSectionModel() );
    final GeneratorAdapter mv = mv();
    mv.visitVarInsn( Opcodes.ALOAD, objectInContext() );
    sectionInContext().compileCallToGetterFor( mv, subSection );
    expressionCompiler().compile_scanArray( new ExpressionCompiler.ForEachElementCompilation()
    {


      public void compile( int _xi ) throws CompilerException

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    super( _methodCompiler, _numericType );
  }


  private final void compile_fun_CODE( ExpressionNode _a ) throws CompilerException
  {
    final GeneratorAdapter mv = mv();
    final int loc = localsOffset();
    final ExpressionCompilerForStrings str = method().stringCompiler();
    str.compile( _a );
    compile_environment();
    mv.visitMethodInsn( Opcodes.INVOKESTATIC, "org/formulacompiler/runtime/internal/Runtime_v2", "fun_CODE", "(Ljava/lang/String;Lorg/formulacompiler/runtime/internal/Environment;)I" );
    compileConversionFromInt();
  }

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    compileConversionFromInt();
  }


  private final void compile_fun_LEN( ExpressionNode _a ) throws CompilerException
  {
    final GeneratorAdapter mv = mv();
    final int loc = localsOffset();
    final ExpressionCompilerForStrings str = method().stringCompiler();
    str.compile( _a );
    mv.visitMethodInsn( Opcodes.INVOKEVIRTUAL, "java/lang/String", "length", "()I" );
    compileConversionFromInt();
  }

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    compileConversionFromInt();
  }


  private final void compile_fun_EXACT( ExpressionNode _a, ExpressionNode _b ) throws CompilerException
  {
    final GeneratorAdapter mv = mv();
    final int loc = localsOffset();
    final ExpressionCompilerForStrings str = method().stringCompiler();
    str.compile( _a );
    str.compile( _b );
    mv.visitMethodInsn( Opcodes.INVOKESTATIC, "org/formulacompiler/runtime/internal/Runtime_v2", "fun_EXACT", "(Ljava/lang/String;Ljava/lang/String;)Z" );
    compileConversionFrom( Boolean.TYPE );
  }

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    compileConversionFrom( Boolean.TYPE );
  }


  private final void compile_fun_SEARCH( ExpressionNode _a, ExpressionNode _b ) throws CompilerException
  {
    final GeneratorAdapter mv = mv();
    final int loc = localsOffset();
    final ExpressionCompilerForStrings str = method().stringCompiler();
    str.compile( _a );
    str.compile( _b );
    mv.visitInsn( Opcodes.ICONST_1 );
    mv.visitMethodInsn( Opcodes.INVOKESTATIC, "org/formulacompiler/runtime/internal/Runtime_v2", "fun_SEARCH", "(Ljava/lang/String;Ljava/lang/String;I)I" );
    compileConversionFromInt();
  }

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    compileConversionFromInt();
  }


  private final void compile_fun_SEARCH( ExpressionNode _a, ExpressionNode _b, ExpressionNode _c ) throws CompilerException
  {
    final GeneratorAdapter mv = mv();
    final int loc = localsOffset();
    final ExpressionCompilerForStrings str = method().stringCompiler();
    str.compile( _a );
    str.compile( _b );
    compile( _c );
    compileConversionTo( Integer.TYPE );
    mv.visitMethodInsn( Opcodes.INVOKESTATIC, "org/formulacompiler/runtime/internal/Runtime_v2", "fun_SEARCH", "(Ljava/lang/String;Ljava/lang/String;I)I" );
    compileConversionFromInt();
  }

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    compileConversionFromInt();
  }


  private final void compile_fun_FIND( ExpressionNode _a, ExpressionNode _b ) throws CompilerException
  {
    final GeneratorAdapter mv = mv();
    final int loc = localsOffset();
    final ExpressionCompilerForStrings str = method().stringCompiler();
    str.compile( _a );
    str.compile( _b );
    mv.visitInsn( Opcodes.ICONST_1 );
    mv.visitMethodInsn( Opcodes.INVOKESTATIC, "org/formulacompiler/runtime/internal/Runtime_v2", "fun_FIND", "(Ljava/lang/String;Ljava/lang/String;I)I" );
    compileConversionFromInt();
  }

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    compileConversionFromInt();
  }


  private final void compile_fun_FIND( ExpressionNode _a, ExpressionNode _b, ExpressionNode _c ) throws CompilerException
  {
    final GeneratorAdapter mv = mv();
    final int loc = localsOffset();
    final ExpressionCompilerForStrings str = method().stringCompiler();
    str.compile( _a );
    str.compile( _b );
    compile( _c );
    compileConversionTo( Integer.TYPE );
    mv.visitMethodInsn( Opcodes.INVOKESTATIC, "org/formulacompiler/runtime/internal/Runtime_v2", "fun_FIND", "(Ljava/lang/String;Ljava/lang/String;I)I" );
    compileConversionFromInt();
  }

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    compileConversionFromInt();
  }


  private final void compile_fun_ERROR( ExpressionNode _a ) throws CompilerException
  {
    final GeneratorAdapter mv = mv();
    final int loc = localsOffset();
    final ExpressionCompilerForStrings str = method().stringCompiler();
    str.compile( _a );
    mv.visitMethodInsn( Opcodes.INVOKESTATIC, "org/formulacompiler/runtime/internal/Runtime_v2", "fun_ERROR", "(Ljava/lang/String;)V" );
    mv.visitInsn( Opcodes.ICONST_M1 );
    compileConversionFromInt();
  }

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    compileConversionFromInt();
  }


  private final void compile_fun_NA() throws CompilerException
  {
    final GeneratorAdapter mv = mv();
    final int loc = localsOffset();
    mv.visitMethodInsn( Opcodes.INVOKESTATIC, "org/formulacompiler/runtime/internal/Runtime_v2", "fun_NA", "()V" );
    mv.visitInsn( Opcodes.ICONST_M1 );
    compileConversionFromInt();
  }

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