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// @(#)invoke.cpp 1.3 95/09/24
// Copyright 1994-1995 by Sun Microsystems Inc.
// All Rights Reserved
//
// IIOP stub support for static and dynamic invocation
//
// This file holds DII support, and an analagous interpreter that let
// static stubs be very small. It's specific to objrefs with
// IIOP::ProfileBody.
//
// NOTE: this may someday be moved within an IIOP class so that the
// public stub interface is completely independent of ORB/protocol
// internals.
//
// THREADING NOTE: Code below this point is of course thread-safe (at
// least on supported threaded platforms), so the caller of these
// routines need only ensure that the data being passed in is not
// being modified by any other thread.
//
// As an _experiment_ (to estimate the performance cost) remote calls
// are currently deemed "cancel-safe". That means that they can be
// called by threads when they're in asynchronous cancellation mode.
// The only effective way to do this is to disable async cancellation
// for the duration of the call. There are numerous rude interactions
// with code generators for C++ ... cancellation handlers just do
// normal stack unwinding like exceptions, but exceptions are purely
// synchronous and sophisticated code generators rely on that to
// generate better code, which in some cases may be very hard to
// unwind.
#include <assert.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <orb.h>
#include "cdr.h"
#include "debug.h"
#include "giop.h"
class ACE_Synchronous_Cancellation_Required
// = TITLE
//
// ACE_Synchronous_Cancellation_Required
//
// = DESCRIPTION
//
// Stick one of these at the beginning of a block that can't
// support asynchronous cancellation, and which must be
// cancel-safe.
//
// = EXAMPLE
// somefunc()
// {
// ACE_Synchronous_Cancellation_Required NOT_USED;
// ...
// }
{
public:
// These should probably be in a separate inline file, but they're
// only used within this one file right now, and we always want them
// inlined, so here they sit.
ACE_Synchronous_Cancellation_Required (void)
{
ACE_OS::thr_setcanceltype (THR_CANCEL_DEFERRED, &old_type_);
}
~ACE_Synchronous_Cancellation_Required (void)
{
int dont_care;
ACE_OS::thr_setcanceltype(old_type_, &dont_care);
}
private:
int old_type_;
};
// "stub interpreter" for static stubs. IDL compiler (or human
// equivalent thereof :-) should just dump a read-only description of
// the call into "calldata" and do varargs calls to this routine,
// which does all the work.
//
// NOTE: This routine includes stub interpreter code, upon which a
// patent application is pending.
void
IIOP_Object::do_call (CORBA_Environment &env, // exception reporting
const TAO_Call_Data *info, // call description
...) // ... any parameters
{
ACE_Synchronous_Cancellation_Required NOT_USED;
GIOP::Invocation call (this,
info->opname,
info->is_roundtrip);
// We may need to loop through here more than once if we're
// forwarded to some other object reference.
//
// NOTE: A quality-of-service policy may be useful to establish
// here, specifically one controlling how many times the call is
// reissued before failing the call on the assumption that something
// is broken.
//
// NOTE: something missing is a dynamic way to change the policy of
// whether to issue LocateRequest messages or not. This code uses a
// simple, fixed policy: never use LocateRequest messages.
//
for (;;)
{
// Start the call by constructing the request message header.
env.clear ();
call.start (env);
if (env.exception ())
{
dexc (env, "do_call, start request message");
return;
}
// Now, put all "in" and "inout" parameters into the request
// message body.
//
// Some "inout" data have an extra level of indirection,
// specified by the language mapping's memory allocation
// policies ... the indirection only shows up here when it's
// needed later for allocating "out" memory, otherwise there's
// just one indirection.
u_int i;
const TAO_Param_Data *pdp;
va_list param_vector;
va_start (param_vector, info);
for (i = 0, pdp = info->params;
i < info->param_count;
i++, pdp++)
{
void *ptr = va_arg (param_vector, void *);
if (pdp->mode == PARAM_IN)
call.put_param (pdp->tc, ptr, env);
else if (pdp->mode == PARAM_INOUT)
{
if (pdp->value_size == 0)
call.put_param (pdp->tc, ptr, env);
else
call.put_param (pdp->tc, *(void **)ptr, env);
}
if (env.exception ())
{
dexc (env, "do_call, put request parameter");
return;
}
}
va_end (param_vector);
// Make the call ... blocking for response if needed. Note that
// "oneway" calls can't return any exceptions except system
// ones.
GIOP::ReplyStatusType status;
CORBA_ExceptionList exceptions;
exceptions.length = exceptions.maximum = info->except_count;
exceptions.buffer = (CORBA_TypeCode_ptr *) info->excepts;
status = call.invoke (exceptions, env);
exceptions.buffer = 0; // don't free it
if (env.exception ())
{
dexc (env, "do_call, invoke");
return;
}
if (!info->is_roundtrip
|| status == GIOP::SYSTEM_EXCEPTION
|| status == GIOP::USER_EXCEPTION)
return;
// Now, get all the "return", "out", and "inout" parameters from
// the response message body.
if (status == GIOP::NO_EXCEPTION)
{
va_start (param_vector, info);
for (i = 0, pdp = info->params;
i < info->param_count;
i++, pdp++)
{
void *ptr = va_arg (param_vector, void *);
if (pdp->mode == PARAM_RETURN
|| pdp->mode == PARAM_OUT
|| pdp->mode == PARAM_INOUT)
{
// The language mapping's memory allocation policy
// says that some data is heap-allocated. This
// interpreter is told about the relevant policy by
// whoever built the operation description (e.g. the
// IDL compiler) so it doesn't have to know the
// policy associated with a particular language
// binding (e.g. C/C++ differ, and C++ even has
// different policies for different kinds of
// structures).
if (pdp->value_size == 0)
call.get_value (pdp->tc, ptr, env);
else
{
// assert (value_size == tc->size());
*(void **)ptr = new CORBA_Octet [pdp->value_size];
call.get_value (pdp->tc, *(void **)ptr, env);
}
if (env.exception ())
{
dexc (env, "do_call, get reply parameter");
return;
}
}
}
va_end (param_vector);
return;
}
// ... or maybe this request got forwarded to someplace else; send
// the request there instead.
assert (status == GIOP::LOCATION_FORWARD);
}
}
// DII analogue of the above. Differs in how the vararg calling
// convention is implemented -- DII doesn't use the normal call stack
// with its implicit typing, but iinstead uses heap-based arguments
// with explicit typing.
void
IIOP_Object::do_dynamic_call (const char *opname, // operation name
CORBA_Boolean is_roundtrip, // results required?
CORBA_NVList_ptr args, // parameters
CORBA_NamedValue_ptr result, // result
CORBA_Flags flags, // per-call flag (one!)
CORBA_ExceptionList &exceptions, // possible user exceptions
CORBA_Environment &env) // exception reporting
{
ACE_Synchronous_Cancellation_Required NOT_USED;
GIOP::Invocation call (this, opname, is_roundtrip);
// Loop as needed for forwarding; see above.
for (;;)
{
// Start the call by constructing the request message header.
env.clear ();
call.start (env);
if (env.exception ())
{
dexc (env, "do_call, start request message");
return;
}
// Now, put all "in" and "inout" parameters into the request
// message body.
u_int i;
for (i = 0; i < args->count (); i++)
{
CORBA_NamedValue_ptr value = args->item (i);
if (value->flags () == CORBA_ARG_IN
|| value->flags () == CORBA_ARG_INOUT)
{
call.put_param (value->value ()->type (),
value->value ()->value (), env);
if (env.exception ())
{
dexc (env, "do_dynamic_call, put request parameter");
return;
}
}
}
// Make the call ... blocking for response if needed. Note that
// "oneway" calls can't return any exceptions except system ones.
GIOP::ReplyStatusType status;
status = call.invoke (exceptions, env);
if (env.exception ())
{
dexc (env, "do_dynamic_call, invoke");
return;
}
if (!is_roundtrip
|| status == GIOP::SYSTEM_EXCEPTION
|| status == GIOP::USER_EXCEPTION)
return;
// Now, get all the "return", "out", and "inout" parameters from the
// response message body ... return parameter is first, the rest are
// in the order defined in the IDL spec (which is also the order that
// DII users are required to use).
if (status == GIOP::NO_EXCEPTION)
{
if (result != 0)
{
// If caller didn't set OUT_LIST_MEMORY flag, allocate
// memory for return value ...
if (!(flags & CORBA_OUT_LIST_MEMORY))
{
CORBA_TypeCode_ptr tcp;
size_t size;
tcp = result->value ()->type ();
size = tcp->size (env);
dexc (env, "do_dynamic_call, get result size");
if (size != 0)
{
void *ptr = new CORBA_Octet [size];
tcp->AddRef ();
result->value ()->replace (tcp, ptr,
CORBA_B_TRUE, env);
dexc (env, "do_dynamic_call, set result mem");
}
}
call.get_value (result->value ()->type (),
result->value ()->value (), env);
}
for (i = 0; i < args->count (); i++)
{
CORBA_NamedValue_ptr value = args->item (i);
if (value->flags () == CORBA_ARG_OUT
|| value->flags () == CORBA_ARG_INOUT)
{
// If caller didn't set OUT_LIST_MEMORY flag, allocate
// memory for this parameter ...
if (!(flags & CORBA_OUT_LIST_MEMORY))
{
CORBA_TypeCode_ptr tcp;
size_t size;
tcp = value->value ()->type ();
size = tcp->size (env);
dexc (env, "do_dynamic_call, get param size");
if (size != 0)
{
void *ptr = new CORBA_Octet [size];
tcp->AddRef ();
value->value ()->replace (tcp, ptr,
CORBA_B_TRUE, env);
dexc (env, "do_dynamic_call, set result mem");
}
}
call.get_value (value->value ()->type (),
value->value ()->value (), env);
if (env.exception ())
{
dexc (env, "do_dynamic_call, get response parameter");
return;
}
}
}
return;
}
// ... or maybe this request got forwarded to someplace else.
assert (status == GIOP::LOCATION_FORWARD);
}
}
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