xref: /petsc/src/sys/objects/pname.c (revision e04113cf637149666d9c83678a5abc4e1b351bcc)

#include <petsc-private/petscimpl.h>        /*I    "petscsys.h"   I*/
#include <petscviewer.h>

#undef __FUNCT__
#define __FUNCT__ "PetscObjectSetName"
/*@C
   PetscObjectSetName - Sets a string name associated with a PETSc object.

   Not Collective

   Input Parameters:
+  obj - the Petsc variable
         Thus must be cast with a (PetscObject), for example,
         PetscObjectSetName((PetscObject)mat,name);
-  name - the name to give obj

   Level: advanced

   Concepts: object name^setting

.seealso: PetscObjectGetName()
@*/
PetscErrorCode  PetscObjectSetName(PetscObject obj,const char name[])
{
  PetscErrorCode ierr;

  PetscFunctionBegin;
  PetscValidHeader(obj,1);
  ierr = PetscFree(obj->name);CHKERRQ(ierr);
  ierr = PetscStrallocpy(name,&obj->name);CHKERRQ(ierr);
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscObjectPrintClassNamePrefixType"
/*@C
      PetscObjectPrintTypeNamePrefix - used in the XXXView() methods to display information about the class, name, prefix and type of an object

   Input Parameters:
+     obj - the PETSc object
-     viewer - ASCII viewer where the information is printed

   Level: developer

.seealso: PetscObjectSetName(), PetscObjectName()

@*/
PetscErrorCode PetscObjectPrintClassNamePrefixType(PetscObject obj,PetscViewer viewer)
{
  PetscErrorCode ierr;
  MPI_Comm       comm;
  PetscMPIInt    size;

  PetscFunctionBegin;
  ierr = PetscViewerASCIIPrintf(viewer,"%s Object:",obj->class_name);CHKERRQ(ierr);
  if (obj->name) {
    ierr = PetscViewerASCIIPrintf(viewer,"%s",obj->name);CHKERRQ(ierr);
  }
  if (obj->prefix) {
    ierr = PetscViewerASCIIPrintf(viewer,"(%s)",obj->prefix);CHKERRQ(ierr);
  }
  ierr = PetscObjectGetComm(obj,&comm);CHKERRQ(ierr);
  ierr = MPI_Comm_size(comm,&size);CHKERRQ(ierr);
  ierr = PetscViewerASCIIPrintf(viewer," %d MPI processes\n",size);CHKERRQ(ierr);
  if (obj->type_name) {
    ierr = PetscViewerASCIIPrintf(viewer,"  type: %s\n",obj->type_name);CHKERRQ(ierr);
  } else {
    ierr = PetscViewerASCIIPrintf(viewer,"  type not yet set\n");CHKERRQ(ierr);
  }
  PetscFunctionReturn(0);
}

#undef __FUNCT__
#define __FUNCT__ "PetscObjectName"
/*@C
   PetscObjectName - Gives an object a name if it does not have one

   Collective

   Input Parameters:
.  obj - the Petsc variable
         Thus must be cast with a (PetscObject), for example,
         PetscObjectName((PetscObject)mat,name);

   Level: developer

   Concepts: object name^setting default

   Notes: This is used in a small number of places when an object NEEDS a name, for example when it is saved to MATLAB with that variable name.
          Use PetscObjectSetName() to set the name of an object to what you want. The SAWs viewer requires that no two published objects
          share the same name.

   Developer Note: this needs to generate the exact same string on all ranks that share the object. The current algorithm may not always work.



.seealso: PetscObjectGetName(), PetscObjectSetName()
@*/
PetscErrorCode  PetscObjectName(PetscObject obj)
{
  PetscErrorCode   ierr;
  PetscCommCounter *counter;
  PetscMPIInt      flg;
  char             name[64];

  PetscFunctionBegin;
  PetscValidHeader(obj,1);
  if (!obj->name) {
    union {MPI_Comm comm; void *ptr; char raw[sizeof(MPI_Comm)]; } ucomm;
    ierr = MPI_Attr_get(obj->comm,Petsc_Counter_keyval,(void*)&counter,&flg);CHKERRQ(ierr);
    if (!flg) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_CORRUPT,"Bad MPI communicator supplied; must be a PETSc communicator");
    ucomm.ptr = NULL;
    ucomm.comm = obj->comm;
    ierr = MPI_Bcast(ucomm.raw,sizeof(MPI_Comm),MPI_BYTE,0,obj->comm);CHKERRQ(ierr);
    /* If the union has extra bytes, their value is implementation-dependent, but they will normally be what we set last
     * in 'ucomm.ptr = NULL'.  This output is always implementation-defined (and varies from run to run) so the union
     * abuse acceptable. */
    ierr = PetscSNPrintf(name,64,"%s_%p_%D",obj->class_name,ucomm.ptr,counter->namecount++);CHKERRQ(ierr);
    ierr = PetscStrallocpy(name,&obj->name);CHKERRQ(ierr);
  }
  PetscFunctionReturn(0);
}



#undef __FUNCT__
#define __FUNCT__ "PetscObjectChangeTypeName"
PetscErrorCode  PetscObjectChangeTypeName(PetscObject obj,const char type_name[])
{
  PetscErrorCode ierr;

  PetscFunctionBegin;
  PetscValidHeader(obj,1);
  ierr = PetscFree(obj->type_name);CHKERRQ(ierr);
  ierr = PetscStrallocpy(type_name,&obj->type_name);CHKERRQ(ierr);
  /* Clear all the old subtype callbacks so they can't accidentally be called (shouldn't happen anyway) */
  ierr = PetscMemzero(obj->fortrancallback[PETSC_FORTRAN_CALLBACK_SUBTYPE],obj->num_fortrancallback[PETSC_FORTRAN_CALLBACK_SUBTYPE]*sizeof(PetscFortranCallback));CHKERRQ(ierr);
  PetscFunctionReturn(0);
}