Example usage for org.eclipse.jdt.internal.compiler.codegen CodeStream swap

Introduction

In this page you can find the example usage for org.eclipse.jdt.internal.compiler.codegen CodeStream swap.

Prototype

public void swap() 

Source Link

Usage

From source file:org.eclipse.objectteams.otdt.internal.core.compiler.lookup.SyntheticRoleFieldAccess.java

License:Open Source License

/**
 * Generate the sequence for invoking this accessor.
 *
 * PRE: the role instance is on the stack, for write access also the new value
 * POST: values from PRE have been consumed, for read access the value is on the stack
 *
 * @param codeStream/*from w  w w. j  a v a 2  s  .c o  m*/
 */
public byte prepareOrGenerateInvocation(CodeStream codeStream, byte opcode) {
    ReferenceBinding roleType = (ReferenceBinding) this.parameters[0];
    if (roleType instanceof UnresolvedReferenceBinding) {
        try {
            roleType = ((UnresolvedReferenceBinding) roleType).resolve(Config.getLookupEnvironment(), false);
        } catch (NotConfiguredException e) {
            e.logWarning("Failed to generate accessor"); //$NON-NLS-1$
            return opcode;
        }
        this.parameters[0] = roleType;
    }
    if (this.purpose == FieldReadAccess || this.purpose == SuperFieldReadAccess) {
        insertOuterAccess(codeStream, roleType); // role -> role,team
        codeStream.swap(); // role,team -> team,role
        codeStream.invoke(Opcodes.OPC_invokevirtual, this, // team,role -> result
                this.declaringClass);
    } else {
        TypeBinding targetType = this.targetWriteField.type;
        LocalVariableBinding arg = new LocalVariableBinding("<tmp>".toCharArray(), //$NON-NLS-1$
                targetType, 0, false);
        arg.resolvedPosition = codeStream.maxLocals;
        arg.useFlag = LocalVariableBinding.USED;
        codeStream.record(arg);
        arg.recordInitializationStartPC(codeStream.position);
        codeStream.store(arg, false/*valueRequired*/); // role, arg -> role
        insertOuterAccess(codeStream, roleType); // role -> role,team
        codeStream.swap(); // role,team -> team,role
        codeStream.load(arg); //            -> team,role,arg
        codeStream.invoke(Opcodes.OPC_invokevirtual, this, //           -> <empty>
                this.declaringClass);
        if (arg.initializationPCs != null) // null checking is asymmetric in LocalVariableBinding.
            arg.recordInitializationEndPC(codeStream.position);
    }
    return 0; // done
}

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