/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */

/*

 *

 *  (C) 2001 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include "mpiimpl.h"

#include "attr.h"

/* -- Begin Profiling Symbol Block for routine MPI_Type_get_attr */

#if defined(HAVE_PRAGMA_WEAK)

#pragma weak MPI_Type_get_attr = PMPI_Type_get_attr

#elif defined(HAVE_PRAGMA_HP_SEC_DEF)

#pragma _HP_SECONDARY_DEF PMPI_Type_get_attr  MPI_Type_get_attr

#elif defined(HAVE_PRAGMA_CRI_DUP)

#pragma _CRI duplicate MPI_Type_get_attr as PMPI_Type_get_attr

#elif defined(HAVE_WEAK_ATTRIBUTE)

int MPI_Type_get_attr(MPI_Datatype datatype, int type_keyval, void *attribute_val, int *flag) __attribute__((weak,alias("PMPI_Type_get_attr")));

#endif

/* -- End Profiling Symbol Block */

/* Define MPICH_MPI_FROM_PMPI if weak symbols are not supported to build

   the MPI routines */

#ifndef MPICH_MPI_FROM_PMPI

#undef MPI_Type_get_attr

#define MPI_Type_get_attr PMPI_Type_get_attr

#undef FUNCNAME

#define FUNCNAME MPIR_TypeGetAttr

int MPIR_TypeGetAttr( MPI_Datatype datatype, int type_keyval, void *attribute_val,

		      int *flag, MPIR_AttrType outAttrType )

{

#ifdef HAVE_ERROR_CHECKING

    static const char FCNAME[] = "MPI_Type_get_attr";

#endif

    int mpi_errno = MPI_SUCCESS;

    MPID_Datatype *type_ptr = NULL;

    MPID_Attribute *p;

    MPID_MPI_STATE_DECL(MPID_STATE_MPIR_TYPE_GET_ATTR);

    MPIR_ERRTEST_INITIALIZED_ORDIE();

    MPID_THREAD_CS_ENTER(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);

    MPID_MPI_FUNC_ENTER(MPID_STATE_MPIR_TYPE_GET_ATTR);

    /* Validate parameters, especially handles needing to be converted */

#   ifdef HAVE_ERROR_CHECKING

    {

        MPID_BEGIN_ERROR_CHECKS;

        {

	    MPIR_ERRTEST_DATATYPE(datatype, "datatype", mpi_errno);

	    MPIR_ERRTEST_KEYVAL(type_keyval, MPID_DATATYPE, "datatype", mpi_errno);

#           ifdef NEEDS_POINTER_ALIGNMENT_ADJUST

            /* A common user error is to pass the address of a 4-byte

	       int when the address of a pointer (or an address-sized int)

	       should have been used.  We can test for this specific

	       case.  Note that this code assumes sizeof(MPIU_Pint) is 

	       a power of 2. */

	    if ((MPIU_Pint)attribute_val & (sizeof(MPIU_Pint)-1)) {

		MPIR_ERR_SETANDSTMT(mpi_errno,MPI_ERR_ARG,goto fn_fail,"**attrnotptr");

	    }

#           endif

        }

        MPID_END_ERROR_CHECKS;

    }

#   endif

    /* Convert MPI object handles to object pointers */

    MPID_Datatype_get_ptr( datatype, type_ptr );

    /* Validate parameters and objects (post conversion) */

#   ifdef HAVE_ERROR_CHECKING

    {

        MPID_BEGIN_ERROR_CHECKS;

        {

	    /* Validate datatype pointer */

	    MPID_Datatype_valid_ptr( type_ptr, mpi_errno );

	    /* If type_ptr is not valid, it will be reset to null */

            if (mpi_errno) goto fn_fail;

        }

        MPID_END_ERROR_CHECKS;

    }

#   endif /* HAVE_ERROR_CHECKING */

    /* ... body of routine ...  */

    *flag = 0;

    p = type_ptr->attributes;

    while (p) {

	if (p->keyval->handle == type_keyval) {

	    *flag = 1;

	    if (outAttrType == MPIR_ATTR_PTR) {

		if (p->attrType == MPIR_ATTR_INT) {

		    /* This is the tricky case: if the system is

		       bigendian, and we have to return a pointer to

		       an int, then we may need to point to the 

		       correct location in the word. */

#if defined(WORDS_LITTLEENDIAN) || (SIZEOF_VOID_P == SIZEOF_INT)

		    *(void**)attribute_val = &(p->value);

#else

		    int *p_loc = (int *)&(p->value);

#if SIZEOF_VOID_P == 2 * SIZEOF_INT

		    p_loc++;

#else 

#error Expected sizeof(void*) to be either sizeof(int) or 2*sizeof(int)

#endif

		    *(void **)attribute_val = p_loc;

#endif

		}

		else if (p->attrType == MPIR_ATTR_AINT) {

		    *(void**)attribute_val = &(p->value);

		}

		else {

		    *(void**)attribute_val = (void *)(MPIU_Pint)(p->value);

		}

	    }

	    else

		*(void**)attribute_val = (void *)(MPIU_Pint)(p->value);

	    break;

	}

	p = p->next;

    }

    /* ... end of body of routine ... */

#ifdef HAVE_ERROR_CHECKING

  fn_exit:

#endif

    MPID_MPI_FUNC_EXIT(MPID_STATE_MPIR_TYPE_GET_ATTR);

    MPID_THREAD_CS_EXIT(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);

    return mpi_errno;

    /* --BEGIN ERROR HANDLING-- */

#   ifdef HAVE_ERROR_CHECKING

  fn_fail:

    {

	mpi_errno = MPIR_Err_create_code(

	    mpi_errno, MPIR_ERR_RECOVERABLE, FCNAME, __LINE__, MPI_ERR_OTHER, 

	    "**mpir_type_get_attr",

	    "**mpir_type_get_attr %D %d %p %p", 

	    datatype, type_keyval, attribute_val, flag);

    }

    mpi_errno = MPIR_Err_return_comm( NULL, FCNAME, mpi_errno );

    goto fn_exit;

#   endif

    /* --END ERROR HANDLING-- */

}

#endif

#undef FUNCNAME

#define FUNCNAME MPI_Type_get_attr

#undef FCNAME

#define FCNAME MPL_QUOTE(FUNCNAME)

/*@

   MPI_Type_get_attr - Retrieves attribute value by key

Input Parameters:

+ datatype - datatype to which the attribute is attached (handle)

- type_keyval - key value (integer) 

Output Parameters:

+ attribute_val - attribute value, unless flag = false 

- flag - false if no attribute is associated with the key (logical) 

   Notes:

    Attributes must be extracted from the same language as they were inserted  

    in with 'MPI_Type_set_attr'.  The notes for C and Fortran below explain 

    why. 

Notes for C:

    Even though the 'attr_value' argument is declared as 'void *', it is

    really the address of a void pointer.  See the rationale in the 

    standard for more details. 

.N ThreadSafe

.N Fortran

.N Errors

.N MPI_SUCCESS

.N MPI_ERR_KEYVAL

.N MPI_ERR_ARG

@*/

int MPI_Type_get_attr(MPI_Datatype datatype, int type_keyval, void *attribute_val,

		      int *flag)

{

    int mpi_errno = MPI_SUCCESS;

    MPID_MPI_STATE_DECL(MPID_STATE_MPI_TYPE_GET_ATTR);

    MPIR_ERRTEST_INITIALIZED_ORDIE();

    MPID_MPI_FUNC_ENTER(MPID_STATE_MPI_TYPE_GET_ATTR);

    /* ... body of routine ...  */

    mpi_errno = MPIR_TypeGetAttr( datatype, type_keyval, attribute_val, flag,

				  MPIR_ATTR_PTR );

    if (mpi_errno) goto fn_fail;

    /* ... end of body of routine ... */

  fn_exit:

    MPID_MPI_FUNC_EXIT(MPID_STATE_MPI_TYPE_GET_ATTR);

    return mpi_errno;

    /* --BEGIN ERROR HANDLING-- */

  fn_fail:

#ifdef HAVE_ERROR_CHECKING

    {

	mpi_errno = MPIR_Err_create_code(

	    mpi_errno, MPIR_ERR_RECOVERABLE, FCNAME, __LINE__, MPI_ERR_OTHER, 

	    "**mpi_type_get_attr",

	    "**mpi_type_get_attr %D %d %p %p", 

	    datatype, type_keyval, attribute_val, flag);

    }

#endif

    mpi_errno = MPIR_Err_return_comm( NULL, FCNAME, mpi_errno );

    goto fn_exit;

    /* --END ERROR HANDLING-- */

}