tracemethodvisitor.java

jboss规则引擎

        appendDescriptor( TraceAbstractVisitor.METHOD_DESCRIPTOR,
                          desc );
        this.buf.append( '\n' );
        this.text.add( this.buf.toString() );

        if ( this.mv != null ) {
            this.mv.visitMethodInsn( opcode,
                                     owner,
                                     name,
                                     desc );
        }
    }

    public void visitJumpInsn(final int opcode,
                              final Label label) {
        this.buf.setLength( 0 );
        this.buf.append( this.tab2 ).append( AbstractVisitor.OPCODES[opcode] ).append( ' ' );
        appendLabel( label );
        this.buf.append( '\n' );
        this.text.add( this.buf.toString() );

        if ( this.mv != null ) {
            this.mv.visitJumpInsn( opcode,
                                   label );
        }
    }

    public void visitLabel(final Label label) {
        this.buf.setLength( 0 );
        this.buf.append( this.ltab );
        appendLabel( label );
        this.buf.append( '\n' );
        this.text.add( this.buf.toString() );

        if ( this.mv != null ) {
            this.mv.visitLabel( label );
        }
    }

    public void visitLdcInsn(final Object cst) {
        this.buf.setLength( 0 );
        this.buf.append( this.tab2 ).append( "LDC " );
        if ( cst instanceof String ) {
            AbstractVisitor.appendString( this.buf,
                                          (String) cst );
        } else if ( cst instanceof Type ) {
            this.buf.append( ((Type) cst).getDescriptor() + ".class" );
        } else {
            this.buf.append( cst );
        }
        this.buf.append( '\n' );
        this.text.add( this.buf.toString() );

        if ( this.mv != null ) {
            this.mv.visitLdcInsn( cst );
        }
    }

    public void visitIincInsn(final int var,
                              final int increment) {
        this.buf.setLength( 0 );
        this.buf.append( this.tab2 ).append( "IINC " ).append( var ).append( ' ' ).append( increment ).append( '\n' );
        this.text.add( this.buf.toString() );

        if ( this.mv != null ) {
            this.mv.visitIincInsn( var,
                                   increment );
        }
    }

    public void visitTableSwitchInsn(final int min,
                                     final int max,
                                     final Label dflt,
                                     final Label labels[]) {
        this.buf.setLength( 0 );
        this.buf.append( this.tab2 ).append( "TABLESWITCH\n" );
        for ( int i = 0; i < labels.length; ++i ) {
            this.buf.append( this.tab3 ).append( min + i ).append( ": " );
            appendLabel( labels[i] );
            this.buf.append( '\n' );
        }
        this.buf.append( this.tab3 ).append( "default: " );
        appendLabel( dflt );
        this.buf.append( '\n' );
        this.text.add( this.buf.toString() );

        if ( this.mv != null ) {
            this.mv.visitTableSwitchInsn( min,
                                          max,
                                          dflt,
                                          labels );
        }
    }

    public void visitLookupSwitchInsn(final Label dflt,
                                      final int keys[],
                                      final Label labels[]) {
        this.buf.setLength( 0 );
        this.buf.append( this.tab2 ).append( "LOOKUPSWITCH\n" );
        for ( int i = 0; i < labels.length; ++i ) {
            this.buf.append( this.tab3 ).append( keys[i] ).append( ": " );
            appendLabel( labels[i] );
            this.buf.append( '\n' );
        }
        this.buf.append( this.tab3 ).append( "default: " );
        appendLabel( dflt );
        this.buf.append( '\n' );
        this.text.add( this.buf.toString() );

        if ( this.mv != null ) {
            this.mv.visitLookupSwitchInsn( dflt,
                                           keys,
                                           labels );
        }
    }

    public void visitMultiANewArrayInsn(final String desc,
                                        final int dims) {
        this.buf.setLength( 0 );
        this.buf.append( this.tab2 ).append( "MULTIANEWARRAY " );
        appendDescriptor( TraceAbstractVisitor.FIELD_DESCRIPTOR,
                          desc );
        this.buf.append( ' ' ).append( dims ).append( '\n' );
        this.text.add( this.buf.toString() );

        if ( this.mv != null ) {
            this.mv.visitMultiANewArrayInsn( desc,
                                             dims );
        }
    }

    public void visitTryCatchBlock(final Label start,
                                   final Label end,
                                   final Label handler,
                                   final String type) {
        this.buf.setLength( 0 );
        this.buf.append( this.tab2 ).append( "TRYCATCHBLOCK " );
        appendLabel( start );
        this.buf.append( ' ' );
        appendLabel( end );
        this.buf.append( ' ' );
        appendLabel( handler );
        this.buf.append( ' ' );
        appendDescriptor( TraceAbstractVisitor.INTERNAL_NAME,
                          type );
        this.buf.append( '\n' );
        this.text.add( this.buf.toString() );

        if ( this.mv != null ) {
            this.mv.visitTryCatchBlock( start,
                                        end,
                                        handler,
                                        type );
        }
    }

    public void visitLocalVariable(final String name,
                                   final String desc,
                                   final String signature,
                                   final Label start,
                                   final Label end,
                                   final int index) {
        this.buf.setLength( 0 );
        this.buf.append( this.tab2 ).append( "LOCALVARIABLE " ).append( name ).append( ' ' );
        appendDescriptor( TraceAbstractVisitor.FIELD_DESCRIPTOR,
                          desc );
        this.buf.append( ' ' );
        appendLabel( start );
        this.buf.append( ' ' );
        appendLabel( end );
        this.buf.append( ' ' ).append( index ).append( '\n' );

        if ( signature != null ) {
            this.buf.append( this.tab2 );
            appendDescriptor( TraceAbstractVisitor.FIELD_SIGNATURE,
                              signature );

            final TraceSignatureVisitor sv = new TraceSignatureVisitor( 0 );
            final SignatureReader r = new SignatureReader( signature );
            r.acceptType( sv );
            this.buf.append( this.tab2 ).append( "// declaration: " ).append( sv.getDeclaration() ).append( '\n' );
        }
        this.text.add( this.buf.toString() );

        if ( this.mv != null ) {
            this.mv.visitLocalVariable( name,
                                        desc,
                                        signature,
                                        start,
                                        end,
                                        index );
        }
    }

    public void visitLineNumber(final int line,
                                final Label start) {
        this.buf.setLength( 0 );
        this.buf.append( this.tab2 ).append( "LINENUMBER " ).append( line ).append( ' ' );
        appendLabel( start );
        this.buf.append( '\n' );
        this.text.add( this.buf.toString() );

        if ( this.mv != null ) {
            this.mv.visitLineNumber( line,
                                     start );
        }
    }

    public void visitMaxs(final int maxStack,
                          final int maxLocals) {
        this.buf.setLength( 0 );
        this.buf.append( this.tab2 ).append( "MAXSTACK = " ).append( maxStack ).append( '\n' );
        this.text.add( this.buf.toString() );

        this.buf.setLength( 0 );
        this.buf.append( this.tab2 ).append( "MAXLOCALS = " ).append( maxLocals ).append( '\n' );
        this.text.add( this.buf.toString() );

        if ( this.mv != null ) {
            this.mv.visitMaxs( maxStack,
                               maxLocals );
        }
    }

    public void visitEnd() {
        super.visitEnd();

        if ( this.mv != null ) {
            this.mv.visitEnd();
        }
    }

    // ------------------------------------------------------------------------
    // Utility methods
    // ------------------------------------------------------------------------

    /**
     * Appends the name of the given label to {@link #buf buf}. Creates a new
     * label name if the given label does not yet have one.
     * 
     * @param l a label.
     */
    public void appendLabel(final Label l) {
        String name = (String) this.labelNames.get( l );
        if ( name == null ) {
            name = "L" + this.labelNames.size();
            this.labelNames.put( l,
                                 name );
        }
        this.buf.append( name );
    }
}