Examples of org.apache.derby.iapi.services.compiler.MethodBuilder.push()

Package org.apache.derby.iapi.services.compiler

Class org.apache.derby.iapi.services.compiler.MethodBuilder

Examples of org.apache.derby.iapi.services.compiler.MethodBuilder.push()

org.apache.derby.iapi.services.compiler.MethodBuilder.push()
Push a byte constant onto the stack
```
 Stack ...  => ...,byte_value 
```

    MethodBuilder userExprFun = ecb.newUserExprFun();


    /* Declare the field and load it with the current row */
    LocalField field = ecb.newFieldDeclaration(Modifier.PRIVATE, ClassName.ExecRow);
        userExprFun.pushThis();
        userExprFun.push( rsNumber );
        userExprFun.callMethod(VMOpcode.INVOKEVIRTUAL, ClassName.BaseActivation, "getCurrentRow", ClassName.Row, 1);
        userExprFun.putField( field );


    // Loop through the result columns, computing generated columns
        // as we go.

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            ResultColumn    rc = (ResultColumn) rcl.elementAt( i );


            if ( !rc.hasGenerationClause() ) { continue; }


            userExprFun.getField(field); // instance
            userExprFun.push(i + 1); // arg1


            rc.generateExpression(ecb, userExprFun);
            userExprFun.cast(ClassName.DataValueDescriptor);
                
            userExprFun.callMethod(VMOpcode.INVOKEINTERFACE, ClassName.Row, "setColumn", "void", 2);

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         ! cb.statementNumHitLimit(1))
      {




        cb.getField(field); // instance
        cb.push(index + 1); // first arg;


        rc.generateExpression(acb, cb);
        cb.cast(ClassName.DataValueDescriptor); // second arg
        cb.callMethod(VMOpcode.INVOKEINTERFACE, ClassName.Row, "setColumn", "void", 2);
        continue;

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        savedItem = acb.addItem(rl);
                
        // get the RowLocation template
        exprFun.getField(lf); // instance for setColumn
        exprFun.push(highestColumnNumber + 1); // first arg


        exprFun.pushThis(); // instance for getRowLocationTemplate
        exprFun.push(savedItem); // first arg
        exprFun.callMethod(VMOpcode.INVOKEINTERFACE, ClassName.Activation, "getRowLocationTemplate",
                  ClassName.RowLocation, 1);

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        // get the RowLocation template
        exprFun.getField(lf); // instance for setColumn
        exprFun.push(highestColumnNumber + 1); // first arg


        exprFun.pushThis(); // instance for getRowLocationTemplate
        exprFun.push(savedItem); // first arg
        exprFun.callMethod(VMOpcode.INVOKEINTERFACE, ClassName.Activation, "getRowLocationTemplate",
                  ClassName.RowLocation, 1);


        exprFun.upCast(ClassName.DataValueDescriptor);
        exprFun.callMethod(VMOpcode.INVOKEINTERFACE, ClassName.Row, "setColumn",

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        // r.setColumn(columnNumber, columnShape);
        //
        // This assumes that there are no "holes" in the column positions,
        // and that column positions reflect the stored format/order
      exprFun.getField(lf); // instance
      exprFun.push(colNum + 1); // first arg
      rc.generateHolder(acb, exprFun);


      exprFun.callMethod(VMOpcode.INVOKEINTERFACE, ClassName.Row, "setColumn", "void", 2);


      // If there is a bit map of referenced columns, use it to

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    //   fieldX = getExecutionFactory().getValueRow(# cols);


    MethodBuilder cb = acb.getConstructor();


    acb.pushGetExecutionFactoryExpression(cb); // instance
    cb.push(numCols);
    cb.callMethod(VMOpcode.INVOKEINTERFACE, (String) null,
              rowAllocatorMethod, rowAllocatorType, 1);
    cb.setField(field);
    /* Increase the statement counter in constructor.  Code size in
     * constructor can become too big (more than 64K) for Java compiler

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      MethodBuilder closeActivationMethod = acb.getCloseActivationMethod();


      closeActivationMethod.getField(psHolder);
      closeActivationMethod.conditionalIfNull();
        // do nothing
        closeActivationMethod.push(0); // work around for no support for real if statements
      closeActivationMethod.startElseCode(); 
        closeActivationMethod.getField(psHolder);
        closeActivationMethod.callMethod(VMOpcode.INVOKEINTERFACE, "java.sql.Statement",
          "close", "void", 0);
        closeActivationMethod.push(0);

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        closeActivationMethod.push(0); // work around for no support for real if statements
      closeActivationMethod.startElseCode(); 
        closeActivationMethod.getField(psHolder);
        closeActivationMethod.callMethod(VMOpcode.INVOKEINTERFACE, "java.sql.Statement",
          "close", "void", 0);
        closeActivationMethod.push(0);


      closeActivationMethod.completeConditional();
      closeActivationMethod.endStatement();
    }

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      ClassName.ResultSet, "execute");
    mb.addThrownException(ClassName.StandardException);


    // put a 'throwIfClosed("execute");' statement into the execute method.
    mb.pushThis(); // instance
    mb.push("execute");
    mb.callMethod(VMOpcode.INVOKEVIRTUAL, ClassName.BaseActivation, "throwIfClosed", "void", 1);


    // call this.startExecution(), so the parent class can know an execution
    // has begun.

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