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//
// $Id$
//
// ============================================================================
//
// = LIBRARY
// TAO IDL
//
// = FILENAME
// attribute.cpp
//
// = DESCRIPTION
// Visitor for generation of code for Attribute
//
// = AUTHOR
// Aniruddha Gokhale
//
// ============================================================================
#include "idl.h"
#include "idl_extern.h"
#include "be.h"
#include "be_visitor_attribute.h"
ACE_RCSID(be_visitor_attribute, attribute, "$Id$")
// Attribute gets mapped to one or possibly two operations based on whether
// it is readonly or not. The two operations "get" and "set" the value of the
// attribute.
//
// code generation for attributes is achieved by mapping an attribute node to
// a corresponding operation node. The reason is that we do not want to
// duplicate the code. However, an attribute node and an operation node have
// different interfaces. Hence we need some form of an adapter that can take us
// from an attribute node to an operation node. The following paragraph
// describes how this is accomplished.
//
// For a "get" operation on the attribute, we create an operation node with the
// same name as the attribute and a return type which is the same as the type
// of the attribute. This operation has no arguments.
//
// For a "set" operation on the attribute (if it is not readonly), we create an
// operation node with a "void" return type and an "in" parameter of the same
// type as the attribute.
// In both cases the context will hold sufficient information to indicate that
// the operation node is really an attribute node.
// *************************************************************************
// primary visitor for "attribute". The context state decides the next state
// *************************************************************************
be_visitor_attribute::be_visitor_attribute (be_visitor_context *ctx)
: be_visitor_decl (ctx)
{
}
be_visitor_attribute::~be_visitor_attribute (void)
{
}
int
be_visitor_attribute::visit_attribute (be_attribute *node)
{
TAO_OutStream *os; // output stream
// be_type *bt; // type node
os = this->ctx_->stream ();
this->ctx_->node (node); // save the node
this->ctx_->attribute (node); // save this attribute node
be_operation *op;
// first the "get" operation
op = new be_operation (node->field_type (), AST_Operation::OP_noflags,
node->name (), 0);
op->set_name (node->name ());
be_visitor_context ctx (*this->ctx_);
// this switch statement eliminates the need for different classes that have
// exactly the same code except different states.
switch (this->ctx_->state ())
{
case TAO_CodeGen::TAO_ATTRIBUTE_CH:
ctx.state (TAO_CodeGen::TAO_OPERATION_CH);
break;
case TAO_CodeGen::TAO_ATTRIBUTE_CS:
ctx.state (TAO_CodeGen::TAO_OPERATION_CS);
break;
case TAO_CodeGen::TAO_ATTRIBUTE_SH:
ctx.state (TAO_CodeGen::TAO_OPERATION_SH);
break;
case TAO_CodeGen::TAO_ATTRIBUTE_SS:
ctx.state (TAO_CodeGen::TAO_OPERATION_SS);
break;
case TAO_CodeGen::TAO_ATTRIBUTE_COLLOCATED_SH:
ctx.state (TAO_CodeGen::TAO_OPERATION_COLLOCATED_SH);
break;
case TAO_CodeGen::TAO_ATTRIBUTE_COLLOCATED_SS:
ctx.state (TAO_CodeGen::TAO_OPERATION_COLLOCATED_SS);
break;
case TAO_CodeGen::TAO_ATTRIBUTE_TIE_SH:
ctx.state (TAO_CodeGen::TAO_OPERATION_TIE_SH);
break;
case TAO_CodeGen::TAO_ATTRIBUTE_TIE_SI:
ctx.state (TAO_CodeGen::TAO_OPERATION_TIE_SI);
break;
}
be_visitor *visitor = tao_cg->make_visitor (&ctx);
if (!visitor || !op || (op->accept (visitor) == -1))
{
delete visitor;
delete op;
ACE_ERROR_RETURN ((LM_ERROR,
"(%N:%l) be_visitor_attribute::"
"visit_attribute - "
"codegen for get_attribute failed\n"),
-1);
}
delete op;
delete visitor;
if (node->readonly ())
return 0; // nothing else to do
// the set method.
// the return type is "void"
be_predefined_type *rt = new be_predefined_type (AST_PredefinedType::PT_void,
new UTL_ScopedName
(new Identifier
("void", 1, 0, I_FALSE), 0),
0);
// argument type is the same as the attribute type
be_argument *arg = new be_argument (AST_Argument::dir_IN,
node->field_type (),
node->name (),
0);
arg->set_name (node->name ());
// create the operation
op = new be_operation (rt, AST_Operation::OP_noflags,
node->name (), 0);
op->set_name (node->name ());
op->add_argument_to_scope (arg);
ctx = *this->ctx_;
// this switch statement eliminates the need for different classes that have
// exactly the same code except different states.
switch (this->ctx_->state ())
{
case TAO_CodeGen::TAO_ATTRIBUTE_CH:
ctx.state (TAO_CodeGen::TAO_OPERATION_CH);
break;
case TAO_CodeGen::TAO_ATTRIBUTE_CS:
ctx.state (TAO_CodeGen::TAO_OPERATION_CS);
break;
case TAO_CodeGen::TAO_ATTRIBUTE_SH:
ctx.state (TAO_CodeGen::TAO_OPERATION_SH);
break;
case TAO_CodeGen::TAO_ATTRIBUTE_SS:
ctx.state (TAO_CodeGen::TAO_OPERATION_SS);
break;
case TAO_CodeGen::TAO_ATTRIBUTE_COLLOCATED_SH:
ctx.state (TAO_CodeGen::TAO_OPERATION_COLLOCATED_SH);
break;
case TAO_CodeGen::TAO_ATTRIBUTE_COLLOCATED_SS:
ctx.state (TAO_CodeGen::TAO_OPERATION_COLLOCATED_SS);
break;
case TAO_CodeGen::TAO_ATTRIBUTE_TIE_SH:
ctx.state (TAO_CodeGen::TAO_OPERATION_TIE_SH);
break;
case TAO_CodeGen::TAO_ATTRIBUTE_TIE_SI:
ctx.state (TAO_CodeGen::TAO_OPERATION_TIE_SI);
break;
}
visitor = tao_cg->make_visitor (&ctx);
if (!visitor || !op || (op->accept (visitor) == -1))
{
delete visitor;
delete op;
delete arg;
delete rt;
ACE_ERROR_RETURN ((LM_ERROR,
"(%N:%l) be_visitor_attribute::"
"visit_attribute - "
"codegen for set_attribute failed\n"),
-1);
}
delete op;
delete visitor;
delete rt;
delete arg;
return 0;
}
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