Examples of org.apache.flex.abc.semantics.Label

org.apache.flex.abc.semantics.Label
A Label represents the target of a branch instruction; it is not the ABC OP_Label instruction. Note: this class has a natural ordering that is inconsistent with equals.

    {
        IDynamicAccessNode arrayIndexNode = (IDynamicAccessNode)((IBinaryOperatorNode)iNode).getLeftOperandNode();
        
        InstructionList result = createInstructionList(iNode, stem.size() * 2 + index.size() + expr.size() + 11 );


        Label tail = new Label();
        int failure_test = is_and? OP_iffalse : OP_iftrue;


        //  Although ASC evaluates the stem twice, it only evaluates the index once.
        //  TODO: Inspect the index expression for side effects so the temp can be
        //  elided in most cases.

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    {
        InstructionList result = createInstructionList(iNode);
        int failure_test = is_and? OP_iffalse : OP_iftrue;
        currentScope.getMethodBodySemanticChecker().checkCompoundAssignment(iNode, member, failure_test);


        Label tail = new Label();


        result.addAll(replicate(stem));
        result.addAll(stem);
        result.addInstruction(OP_getproperty, member.getName());
        //  Assume this is the result.

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        InstructionList finally_insns = new InstructionList();
        InstructionList final_throw = new InstructionList();


        ExceptionHandlingContext finally_context = currentScope.getFlowManager().getFinallyContext();


        Label final_catch_target = final_catch.getLabel();


        //  We need a local to store the caught exception.
        Binding exception_storage = finally_context.getExceptionStorage();


        Collection<Label> pending_normal_control_flow = try_stmt.stripPendingLabels();


        if ( try_stmt.canFallThrough() || pending_normal_control_flow != null )
        {
            normal_flow_fixup.addInstruction(OP_jump, finally_context.finallyBlock);
        }
        else
        {
            //  Extend the region past a terminating
            //  throw statement to give the AVM a
            //  little buffer to figure out its
            //  exception-handling regions.
            normal_flow_fixup.addInstruction(OP_nop);
        }


        Label try_start = try_stmt.getLabel();
        Label try_end   = normal_flow_fixup.getLastLabel();


        Label finally_region_end = null;


        if ( null == catch_blocks )
        {
            finally_region_end = try_end;
        }

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        result.addInstruction(OP_jump, test_insns_with_debug_ops.getLabel());


        //  Loop body
        InstructionList loop_body = new InstructionList();
        Label loop_head = new Label();
        loop_body.addInstruction(OP_label);
        loop_body.labelCurrent(loop_head);
        loop_body.addAll(body);


        //  Set the continue target on the correct instruction.

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        result.addInstruction(OP_pushstring, "");
        result.addInstruction(OP_construct, 1);
        result.addInstruction(result_temp.setlocal());


        //  Jump to the loop test.
        Label test = new Label();
        result.addInstruction(OP_jump, test);


        //  Top of the loop: put an AET Label on
        //  the ABC OP_Label.
        Label loop = new Label();
        result.labelNext(loop);
        result.addInstruction(OP_label);
        //  Get the next value and cache it.
        result.addInstruction(hasnext.stem_temp.getlocal());
        result.addInstruction(hasnext.index_temp.getlocal());
        result.addInstruction(OP_nextvalue);
        result.addInstruction(OP_dup);
        result.addInstruction(value_temp.setlocal() );
        //  See ECMA-357 11.2.4
        result.addInstruction(OP_pushwith);


        result.addAll(filter);


        Label no_match = new Label();
        result.addInstruction(OP_iffalse, no_match);


        result.addInstruction(result_temp.getlocal() );
        result.addInstruction(hasnext.index_temp.getlocal() );
        result.addInstruction(value_temp.getlocal() );

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        InstructionList result = createInstructionList(iNode);


        boolean has_else = !if_elseif.isEmpty();


        //  Label to the "next statement."
        Label tail = null;


        //  TODO: Use conditionalJump style tests.
        result.addAll(test);


        if ( has_else )

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     *    responsible for saving this label and applying it appropriately at
     *    the destination point.
     */
    private Label addBranch(InstructionList insns, Label previousLabel, int opcode)
    {
        Label result = previousLabel != null? previousLabel: new Label();
        insns.addInstruction(opcode, result);
        return result;
    }

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     *    otherwise a new Label that the caller must use to label the next
     *    part of the statement.
     */
    private Label addInterstitialControlFlow(InstructionList insns, Label previousLabel)
    {
        Label result;


        if ( insns.canFallThrough() )
        {
            result = addBranch(insns, previousLabel, OP_jump);
        }

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    }


    public InstructionList reduce_labeledStmt(IASNode iNode, String label, InstructionList substatement)
    {
        InstructionList result = createInstructionList(iNode, 1);
        Label gotoLabel = currentScope.getFlowManager().getGotoLabel(label);
        // Since duplicate labels are invisible to goto statements,
        // we can fail to find a goto context for a label.
        if (gotoLabel != null)
        {
            result.labelNext(gotoLabel);

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    }


    public InstructionList reduce_logicalAndExpr(IASNode iNode, InstructionList l, InstructionList r)
    {
        InstructionList result = createInstructionList(iNode, l.size() + r.size() + 3);
        Label tail = new Label();


        result.addAll(l);
        result.addInstruction(OP_dup);
        result.addInstruction(OP_iffalse, tail);
        result.addInstruction(OP_pop);

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Related Classes of org.apache.flex.abc.semantics.Label

org.apache.flex.abc.ABCEmitter

org.apache.flex.abc.instructionlist.InstructionList

org.apache.flex.compiler.internal.as.codegen.ABCGeneratingReducer

org.apache.flex.compiler.internal.as.codegen.BindableHelper

org.apache.flex.compiler.internal.as.codegen.ControlFlowContextManager

org.apache.flex.compiler.internal.as.codegen.ExceptionHandlingContext

org.apache.flex.compiler.internal.as.codegen.InlineFunctionLexicalScope

org.apache.flex.compiler.internal.as.codegen.LabeledStatementControlFlowContext

org.apache.flex.compiler.internal.as.codegen.LabelScopeControlFlowContext

org.apache.flex.compiler.internal.as.codegen.LoopControlFlowContext

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