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

    mv.visitInsn( Opcodes.LDIV );
  }


  protected final void compile_util_fromInt() throws CompilerException
  {
    final GeneratorAdapter mv = mv();
    final int loc = localsOffset();
    mv.visitInsn( Opcodes.I2L );
  }

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    mv.visitInsn( Opcodes.I2L );
  }


  protected final void compile_util_fromLong() throws CompilerException
  {
    final GeneratorAdapter mv = mv();
    final int loc = localsOffset();
  }

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    final int loc = localsOffset();
  }


  protected final void compile_util_fromDouble() throws CompilerException
  {
    final GeneratorAdapter mv = mv();
    final int loc = localsOffset();
    mv.visitInsn( Opcodes.D2L );
  }

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    mv.visitInsn( Opcodes.D2L );
  }


  protected final void compile_util_fromDouble_Scaled() throws CompilerException
  {
    final GeneratorAdapter mv = mv();
    final int loc = localsOffset();
    compile_context();
    mv.visitMethodInsn( Opcodes.INVOKESTATIC, "org/formulacompiler/runtime/internal/RuntimeLong_v2", "fromDouble", "(DLorg/formulacompiler/runtime/internal/RuntimeLong_v2$Context;)J" );
  }

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    mv.visitMethodInsn( Opcodes.INVOKESTATIC, "org/formulacompiler/runtime/internal/RuntimeLong_v2", "fromDouble", "(DLorg/formulacompiler/runtime/internal/RuntimeLong_v2$Context;)J" );
  }


  protected final void compile_util_fromFloat() throws CompilerException
  {
    final GeneratorAdapter mv = mv();
    final int loc = localsOffset();
    mv.visitInsn( Opcodes.F2L );
  }

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    mv.visitInsn( Opcodes.F2L );
  }


  protected final void compile_util_fromFloat_Scaled() throws CompilerException
  {
    final GeneratorAdapter mv = mv();
    final int loc = localsOffset();
    mv.visitInsn( Opcodes.F2D );
    compile_context();
    mv.visitMethodInsn( Opcodes.INVOKESTATIC, "org/formulacompiler/runtime/internal/RuntimeLong_v2", "fromDouble", "(DLorg/formulacompiler/runtime/internal/RuntimeLong_v2$Context;)J" );
  }

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    mv.visitMethodInsn( Opcodes.INVOKESTATIC, "org/formulacompiler/runtime/internal/RuntimeLong_v2", "fromDouble", "(DLorg/formulacompiler/runtime/internal/RuntimeLong_v2$Context;)J" );
  }


  protected final void compile_util_fromBigDecimal() throws CompilerException
  {
    final GeneratorAdapter mv = mv();
    final int loc = localsOffset();
    compile_context();
    mv.visitMethodInsn( Opcodes.INVOKESTATIC, "org/formulacompiler/runtime/internal/RuntimeLong_v2", "fromBigDecimal", "(Ljava/math/BigDecimal;Lorg/formulacompiler/runtime/internal/RuntimeLong_v2$Context;)J" );
  }

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    mv.visitMethodInsn( Opcodes.INVOKESTATIC, "org/formulacompiler/runtime/internal/RuntimeLong_v2", "fromBigDecimal", "(Ljava/math/BigDecimal;Lorg/formulacompiler/runtime/internal/RuntimeLong_v2$Context;)J" );
  }


  protected final void compile_util_fromBigDecimal_Scaled() throws CompilerException
  {
    final GeneratorAdapter mv = mv();
    final int loc = localsOffset();
    compile_context();
    mv.visitMethodInsn( Opcodes.INVOKESTATIC, "org/formulacompiler/runtime/internal/RuntimeLong_v2", "fromBigDecimal", "(Ljava/math/BigDecimal;Lorg/formulacompiler/runtime/internal/RuntimeLong_v2$Context;)J" );
  }

View Full Code Here

    mv.visitMethodInsn( Opcodes.INVOKESTATIC, "org/formulacompiler/runtime/internal/RuntimeLong_v2", "fromBigDecimal", "(Ljava/math/BigDecimal;Lorg/formulacompiler/runtime/internal/RuntimeLong_v2$Context;)J" );
  }


  protected final void compile_util_fromNumber() throws CompilerException
  {
    final GeneratorAdapter mv = mv();
    final int loc = localsOffset();
    Label l_0 = new Label();
    Label l_1 = new Label();
    mv.visitInsn( Opcodes.DUP );
    mv.visitVarInsn( Opcodes.ASTORE, 0 + loc );
    mv.visitJumpInsn( Opcodes.IFNONNULL, l_0 );
    mv.visitInsn( Opcodes.LCONST_0 );
    mv.visitJumpInsn( Opcodes.GOTO, l_1 );
    mv.visitLabel( l_0 );
    mv.visitVarInsn( Opcodes.ALOAD, 0 + loc );
    mv.visitMethodInsn( Opcodes.INVOKEVIRTUAL, "java/lang/Number", "longValue", "()J" );
    mv.visitLabel( l_1 );
  }

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    mv.visitLabel( l_1 );
  }


  protected final void compile_util_fromBoolean() throws CompilerException
  {
    final GeneratorAdapter mv = mv();
    final int loc = localsOffset();
    Label l_0 = new Label();
    Label l_1 = new Label();
    mv.visitJumpInsn( Opcodes.IFEQ, l_0 );
    compile_one();
    mv.visitJumpInsn( Opcodes.GOTO, l_1 );
    mv.visitLabel( l_0 );
    mv.visitInsn( Opcodes.LCONST_0 );
    mv.visitLabel( l_1 );
  }

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