Actual source code: dmimpl.h

petsc-master 2020-10-22
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  3: #if !defined(_DMIMPL_H)
  4: #define _DMIMPL_H

  6: #include <petscdm.h>
  7: #include <petsc/private/petscimpl.h>
  8: #include <petsc/private/petscdsimpl.h>
  9: #include <petsc/private/sectionimpl.h>

 11: PETSC_EXTERN PetscBool DMRegisterAllCalled;
 12: PETSC_EXTERN PetscErrorCode DMRegisterAll(void);
 13: typedef PetscErrorCode (*NullSpaceFunc)(DM dm, PetscInt origField, PetscInt field, MatNullSpace *nullSpace);

 15: typedef struct _DMOps *DMOps;
 16: struct _DMOps {
 17:   PetscErrorCode (*view)(DM,PetscViewer);
 18:   PetscErrorCode (*load)(DM,PetscViewer);
 19:   PetscErrorCode (*clone)(DM,DM*);
 20:   PetscErrorCode (*setfromoptions)(PetscOptionItems*,DM);
 21:   PetscErrorCode (*setup)(DM);
 22:   PetscErrorCode (*createlocalsection)(DM);
 23:   PetscErrorCode (*createdefaultconstraints)(DM);
 24:   PetscErrorCode (*createglobalvector)(DM,Vec*);
 25:   PetscErrorCode (*createlocalvector)(DM,Vec*);
 26:   PetscErrorCode (*getlocaltoglobalmapping)(DM);
 27:   PetscErrorCode (*createfieldis)(DM,PetscInt*,char***,IS**);
 28:   PetscErrorCode (*createcoordinatedm)(DM,DM*);
 29:   PetscErrorCode (*createcoordinatefield)(DM,DMField*);

 31:   PetscErrorCode (*getcoloring)(DM,ISColoringType,ISColoring*);
 32:   PetscErrorCode (*creatematrix)(DM, Mat*);
 33:   PetscErrorCode (*createinterpolation)(DM,DM,Mat*,Vec*);
 34:   PetscErrorCode (*createrestriction)(DM,DM,Mat*);
 35:   PetscErrorCode (*createmassmatrix)(DM,DM,Mat*);
 36:   PetscErrorCode (*hascreateinjection)(DM,PetscBool*);
 37:   PetscErrorCode (*createinjection)(DM,DM,Mat*);

 39:   PetscErrorCode (*refine)(DM,MPI_Comm,DM*);
 40:   PetscErrorCode (*coarsen)(DM,MPI_Comm,DM*);
 41:   PetscErrorCode (*refinehierarchy)(DM,PetscInt,DM*);
 42:   PetscErrorCode (*coarsenhierarchy)(DM,PetscInt,DM*);
 43:   PetscErrorCode (*adaptlabel)(DM,DMLabel,DM*);
 44:   PetscErrorCode (*adaptmetric)(DM,Vec,DMLabel,DM*);

 46:   PetscErrorCode (*globaltolocalbegin)(DM,Vec,InsertMode,Vec);
 47:   PetscErrorCode (*globaltolocalend)(DM,Vec,InsertMode,Vec);
 48:   PetscErrorCode (*localtoglobalbegin)(DM,Vec,InsertMode,Vec);
 49:   PetscErrorCode (*localtoglobalend)(DM,Vec,InsertMode,Vec);
 50:   PetscErrorCode (*localtolocalbegin)(DM,Vec,InsertMode,Vec);
 51:   PetscErrorCode (*localtolocalend)(DM,Vec,InsertMode,Vec);

 53:   PetscErrorCode (*destroy)(DM);

 55:   PetscErrorCode (*computevariablebounds)(DM,Vec,Vec);

 57:   PetscErrorCode (*createsubdm)(DM,PetscInt,const PetscInt*,IS*,DM*);
 58:   PetscErrorCode (*createsuperdm)(DM*,PetscInt,IS**,DM*);
 59:   PetscErrorCode (*createfielddecomposition)(DM,PetscInt*,char***,IS**,DM**);
 60:   PetscErrorCode (*createdomaindecomposition)(DM,PetscInt*,char***,IS**,IS**,DM**);
 61:   PetscErrorCode (*createddscatters)(DM,PetscInt,DM*,VecScatter**,VecScatter**,VecScatter**);

 63:   PetscErrorCode (*getdimpoints)(DM,PetscInt,PetscInt*,PetscInt*);
 64:   PetscErrorCode (*locatepoints)(DM,Vec,DMPointLocationType,PetscSF);
 65:   PetscErrorCode (*getneighbors)(DM,PetscInt*,const PetscMPIInt**);
 66:   PetscErrorCode (*getboundingbox)(DM,PetscReal*,PetscReal*);
 67:   PetscErrorCode (*getlocalboundingbox)(DM,PetscReal*,PetscReal*);
 68:   PetscErrorCode (*locatepointssubdomain)(DM,Vec,PetscMPIInt**);

 70:   PetscErrorCode (*projectfunctionlocal)(DM,PetscReal,PetscErrorCode(**)(PetscInt,PetscReal,const PetscReal[],PetscInt,PetscScalar *,void *),void **,InsertMode,Vec);
 71:   PetscErrorCode (*projectfunctionlabellocal)(DM,PetscReal,DMLabel,PetscInt,const PetscInt[],PetscInt,const PetscInt[],PetscErrorCode(**)(PetscInt,PetscReal,const PetscReal[],PetscInt,PetscScalar *,void *),void **,InsertMode,Vec);
 72:   PetscErrorCode (*projectfieldlocal)(DM,PetscReal,Vec,void(**)(PetscInt,PetscInt,PetscInt,const PetscInt[],const PetscInt[],const PetscScalar[],const PetscScalar[],const PetscScalar[],const PetscInt[],const PetscInt[],const PetscScalar[],const PetscScalar[],const PetscScalar[],PetscReal,const PetscReal[],PetscInt,const PetscScalar[],PetscScalar[]),InsertMode,Vec);
 73:   PetscErrorCode (*projectfieldlabellocal)(DM,PetscReal,DMLabel,PetscInt,const PetscInt[],PetscInt,const PetscInt[],Vec,void(**)(PetscInt,PetscInt,PetscInt,const PetscInt[],const PetscInt[],const PetscScalar[],const PetscScalar[],const PetscScalar[],const PetscInt[],const PetscInt[],const PetscScalar[],const PetscScalar[],const PetscScalar[],PetscReal,const PetscReal[],PetscInt,const PetscScalar[],PetscScalar[]),InsertMode,Vec);
 74:   PetscErrorCode (*projectbdfieldlabellocal)(DM,PetscReal,DMLabel,PetscInt,const PetscInt[],PetscInt,const PetscInt[],Vec,void(**)(PetscInt,PetscInt,PetscInt,const PetscInt[],const PetscInt[],const PetscScalar[],const PetscScalar[],const PetscScalar[],const PetscInt[],const PetscInt[],const PetscScalar[],const PetscScalar[],const PetscScalar[],PetscReal,const PetscReal[],const PetscReal[],PetscInt,const PetscScalar[],PetscScalar[]),InsertMode,Vec);
 75:   PetscErrorCode (*computel2diff)(DM,PetscReal,PetscErrorCode(**)(PetscInt, PetscReal,const PetscReal [], PetscInt, PetscScalar *, void *), void **, Vec, PetscReal *);
 76:   PetscErrorCode (*computel2gradientdiff)(DM,PetscReal,PetscErrorCode(**)(PetscInt,PetscReal,const PetscReal [],const PetscReal[],PetscInt, PetscScalar *,void *),void **,Vec,const PetscReal[],PetscReal *);
 77:   PetscErrorCode (*computel2fielddiff)(DM,PetscReal,PetscErrorCode(**)(PetscInt, PetscReal,const PetscReal [], PetscInt, PetscScalar *, void *), void **, Vec, PetscReal *);

 79:   PetscErrorCode (*getcompatibility)(DM,DM,PetscBool*,PetscBool*);
 80: };

 82: PETSC_EXTERN PetscErrorCode DMLocalizeCoordinate_Internal(DM, PetscInt, const PetscScalar[], const PetscScalar[], PetscScalar[]);
 83: PETSC_EXTERN PetscErrorCode DMLocalizeCoordinateReal_Internal(DM, PetscInt, const PetscReal[], const PetscReal[], PetscReal[]);
 84: PETSC_EXTERN PetscErrorCode DMLocalizeAddCoordinate_Internal(DM, PetscInt, const PetscScalar[], const PetscScalar[], PetscScalar[]);

 86: typedef struct _DMCoarsenHookLink *DMCoarsenHookLink;
 87: struct _DMCoarsenHookLink {
 88:   PetscErrorCode (*coarsenhook)(DM,DM,void*);              /* Run once, when coarse DM is created */
 89:   PetscErrorCode (*restricthook)(DM,Mat,Vec,Mat,DM,void*); /* Run each time a new problem is restricted to a coarse grid */
 90:   void *ctx;
 91:   DMCoarsenHookLink next;
 92: };

 94: typedef struct _DMRefineHookLink *DMRefineHookLink;
 95: struct _DMRefineHookLink {
 96:   PetscErrorCode (*refinehook)(DM,DM,void*);     /* Run once, when a fine DM is created */
 97:   PetscErrorCode (*interphook)(DM,Mat,DM,void*); /* Run each time a new problem is interpolated to a fine grid */
 98:   void *ctx;
 99:   DMRefineHookLink next;
100: };

102: typedef struct _DMSubDomainHookLink *DMSubDomainHookLink;
103: struct _DMSubDomainHookLink {
104:   PetscErrorCode (*ddhook)(DM,DM,void*);
105:   PetscErrorCode (*restricthook)(DM,VecScatter,VecScatter,DM,void*);
106:   void *ctx;
107:   DMSubDomainHookLink next;
108: };

110: typedef struct _DMGlobalToLocalHookLink *DMGlobalToLocalHookLink;
111: struct _DMGlobalToLocalHookLink {
112:   PetscErrorCode (*beginhook)(DM,Vec,InsertMode,Vec,void*);
113:   PetscErrorCode (*endhook)(DM,Vec,InsertMode,Vec,void*);
114:   void *ctx;
115:   DMGlobalToLocalHookLink next;
116: };

118: typedef struct _DMLocalToGlobalHookLink *DMLocalToGlobalHookLink;
119: struct _DMLocalToGlobalHookLink {
120:   PetscErrorCode (*beginhook)(DM,Vec,InsertMode,Vec,void*);
121:   PetscErrorCode (*endhook)(DM,Vec,InsertMode,Vec,void*);
122:   void *ctx;
123:   DMLocalToGlobalHookLink next;
124: };

126: typedef enum {DMVEC_STATUS_IN,DMVEC_STATUS_OUT} DMVecStatus;
127: typedef struct _DMNamedVecLink *DMNamedVecLink;
128: struct _DMNamedVecLink {
129:   Vec X;
130:   char *name;
131:   DMVecStatus status;
132:   DMNamedVecLink next;
133: };

135: typedef struct _DMWorkLink *DMWorkLink;
136: struct _DMWorkLink {
137:   size_t     bytes;
138:   void       *mem;
139:   DMWorkLink next;
140: };

142: #define DM_MAX_WORK_VECTORS 100 /* work vectors available to users  via DMGetGlobalVector(), DMGetLocalVector() */

144: struct _n_DMLabelLink {
145:   DMLabel              label;
146:   PetscBool            output;
147:   struct _n_DMLabelLink *next;
148: };
149: typedef struct _n_DMLabelLink *DMLabelLink;

151: typedef struct _n_Boundary *DMBoundary;

153: struct _n_Boundary {
154:   DSBoundary  dsboundary;
155:   DMLabel     label;
156:   DMBoundary  next;
157: };

159: typedef struct _n_Field {
160:   PetscObject disc;         /* Field discretization, or a PetscContainer with the field name */
161:   DMLabel     label;        /* Label defining the domain of definition of the field */
162:   PetscBool   adjacency[2]; /* Flags for defining variable influence (adjacency) for each field [use cone() or support() first, use the transitive closure] */
163: } RegionField;

165: typedef struct _n_Space {
166:   PetscDS ds;     /* Approximation space in this domain */
167:   DMLabel label;  /* Label defining the domain of definition of the discretization */
168:   IS      fields; /* Map from DS field numbers to original field numbers in the DM */
169: } DMSpace;

171: PETSC_INTERN PetscErrorCode DMDestroyLabelLinkList_Internal(DM);

173: #define MAXDMMONITORS 5

175: struct _p_DM {
176:   PETSCHEADER(struct _DMOps);
177:   Vec                     localin[DM_MAX_WORK_VECTORS],localout[DM_MAX_WORK_VECTORS];
178:   Vec                     globalin[DM_MAX_WORK_VECTORS],globalout[DM_MAX_WORK_VECTORS];
179:   DMNamedVecLink          namedglobal;
180:   DMNamedVecLink          namedlocal;
181:   DMWorkLink              workin,workout;
182:   DMLabelLink             labels;            /* Linked list of labels */
183:   DMLabel                 depthLabel;        /* Optimized access to depth label */
184:   DMLabel                 celltypeLabel;     /* Optimized access to celltype label */
185:   void                    *ctx;    /* a user context */
186:   PetscErrorCode          (*ctxdestroy)(void**);
187:   ISColoringType          coloringtype;
188:   MatFDColoring           fd;
189:   VecType                 vectype;  /* type of vector created with DMCreateLocalVector() and DMCreateGlobalVector() */
190:   MatType                 mattype;  /* type of matrix created with DMCreateMatrix() */
191:   PetscInt                bs;
192:   ISLocalToGlobalMapping  ltogmap;
193:   PetscBool               prealloc_only; /* Flag indicating the DMCreateMatrix() should only preallocate, not fill the matrix */
194:   PetscBool               structure_only; /* Flag indicating the DMCreateMatrix() create matrix structure without values */
195:   PetscInt                levelup,leveldown;  /* if the DM has been obtained by refining (or coarsening) this indicates how many times that process has been used to generate this DM */
196:   PetscBool               setupcalled;        /* Indicates that the DM has been set up, methods that modify a DM such that a fresh setup is required should reset this flag */
197:   PetscBool               setfromoptionscalled;
198:   void                    *data;
199:   /* Hierarchy / Submeshes */
200:   DM                      coarseMesh;
201:   DM                      fineMesh;
202:   DMCoarsenHookLink       coarsenhook; /* For transfering auxiliary problem data to coarser grids */
203:   DMRefineHookLink        refinehook;
204:   DMSubDomainHookLink     subdomainhook;
205:   DMGlobalToLocalHookLink gtolhook;
206:   DMLocalToGlobalHookLink ltoghook;
207:   /* Topology */
208:   PetscInt                dim;                  /* The topological dimension */
209:   /* Flexible communication */
210:   PetscSF                 sfMigration;          /* SF for point distribution created during distribution */
211:   PetscSF                 sf;                   /* SF for parallel point overlap */
212:   PetscSF                 sectionSF;            /* SF for parallel dof overlap using section */
213:   PetscSF                 sfNatural;            /* SF mapping to the "natural" ordering */
214:   PetscBool               useNatural;           /* Create the natural SF */
215:   /* Allows a non-standard data layout */
216:   PetscBool               adjacency[2];         /* [use cone() or support() first, use the transitive closure] */
217:   PetscSection            localSection;         /* Layout for local vectors */
218:   PetscSection            globalSection;        /* Layout for global vectors */
219:   PetscLayout             map;
220:   /* Constraints */
221:   PetscSection            defaultConstraintSection;
222:   Mat                     defaultConstraintMat;
223:   /* Basis transformation */
224:   DM                      transformDM;          /* Layout for basis transformation */
225:   Vec                     transform;            /* Basis transformation matrices */
226:   void                   *transformCtx;         /* Basis transformation context */
227:   PetscErrorCode        (*transformSetUp)(DM, void *);
228:   PetscErrorCode        (*transformDestroy)(DM, void *);
229:   PetscErrorCode        (*transformGetMatrix)(DM, const PetscReal[], PetscBool, const PetscScalar **, void *);
230:   /* Coordinates */
231:   PetscInt                dimEmbed;             /* The dimension of the embedding space */
232:   DM                      coordinateDM;         /* Layout for coordinates */
233:   Vec                     coordinates;          /* Coordinate values in global vector */
234:   Vec                     coordinatesLocal;     /* Coordinate values in local  vector */
235:   PetscBool               periodic;             /* Is the DM periodic? */
236:   DMField                 coordinateField;      /* Coordinates as an abstract field */
237:   PetscReal              *L, *maxCell;          /* Size of periodic box and max cell size for determining periodicity */
238:   DMBoundaryType         *bdtype;               /* Indicates type of topological boundary */
239:   /* Null spaces -- of course I should make this have a variable number of fields */
240:   NullSpaceFunc           nullspaceConstructors[10];
241:   NullSpaceFunc           nearnullspaceConstructors[10];
242:   /* Fields are represented by objects */
243:   PetscInt                Nf;                   /* Number of fields defined on the total domain */
244:   RegionField            *fields;               /* Array of discretization fields with regions of validity */
245:   DMBoundary              boundary;             /* List of boundary conditions */
246:   PetscInt                Nds;                  /* Number of discrete systems defined on the total domain */
247:   DMSpace                *probs;                /* Array of discrete systems */
248:   /* Output structures */
249:   DM                      dmBC;                 /* The DM with boundary conditions in the global DM */
250:   PetscInt                outputSequenceNum;    /* The current sequence number for output */
251:   PetscReal               outputSequenceVal;    /* The current sequence value for output */
252:   PetscErrorCode        (*monitor[MAXDMMONITORS])(DM, void *);
253:   PetscErrorCode        (*monitordestroy[MAXDMMONITORS])(void **);
254:   void                   *monitorcontext[MAXDMMONITORS];
255:   PetscInt                numbermonitors;

257:   PetscObject             dmksp,dmsnes,dmts;
258: };

260: PETSC_EXTERN PetscLogEvent DM_Convert;
261: PETSC_EXTERN PetscLogEvent DM_GlobalToLocal;
262: PETSC_EXTERN PetscLogEvent DM_LocalToGlobal;
263: PETSC_EXTERN PetscLogEvent DM_LocatePoints;
264: PETSC_EXTERN PetscLogEvent DM_Coarsen;
265: PETSC_EXTERN PetscLogEvent DM_Refine;
266: PETSC_EXTERN PetscLogEvent DM_CreateInterpolation;
267: PETSC_EXTERN PetscLogEvent DM_CreateRestriction;
268: PETSC_EXTERN PetscLogEvent DM_CreateInjection;
269: PETSC_EXTERN PetscLogEvent DM_CreateMatrix;
270: PETSC_EXTERN PetscLogEvent DM_Load;
271: PETSC_EXTERN PetscLogEvent DM_AdaptInterpolator;

273: PETSC_EXTERN PetscErrorCode DMCreateGlobalVector_Section_Private(DM,Vec*);
274: PETSC_EXTERN PetscErrorCode DMCreateLocalVector_Section_Private(DM,Vec*);

276: PETSC_EXTERN PetscErrorCode DMView_GLVis(DM,PetscViewer,PetscErrorCode(*)(DM,PetscViewer));

278: /*

280:           Composite Vectors

282:       Single global representation
283:       Individual global representations
284:       Single local representation
285:       Individual local representations

287:       Subsets of individual as a single????? Do we handle this by having DMComposite inside composite??????

289:        DM da_u, da_v, da_p

291:        DM dm_velocities

293:        DM dm

295:        DMDACreate(,&da_u);
296:        DMDACreate(,&da_v);
297:        DMCompositeCreate(,&dm_velocities);
298:        DMCompositeAddDM(dm_velocities,(DM)du);
299:        DMCompositeAddDM(dm_velocities,(DM)dv);

301:        DMDACreate(,&da_p);
302:        DMCompositeCreate(,&dm_velocities);
303:        DMCompositeAddDM(dm,(DM)dm_velocities);
304:        DMCompositeAddDM(dm,(DM)dm_p);


307:     Access parts of composite vectors (Composite only)
308:     ---------------------------------
309:       DMCompositeGetAccess  - access the global vector as subvectors and array (for redundant arrays)
310:       ADD for local vector -

312:     Element access
313:     --------------
314:       From global vectors
315:          -DAVecGetArray   - for DMDA
316:          -VecGetArray - for DMSliced
317:          ADD for DMComposite???  maybe

319:       From individual vector
320:           -DAVecGetArray - for DMDA
321:           -VecGetArray -for sliced
322:          ADD for DMComposite??? maybe

324:       From single local vector
325:           ADD         * single local vector as arrays?

327:    Communication
328:    -------------
329:       DMGlobalToLocal - global vector to single local vector

331:       DMCompositeScatter/Gather - direct to individual local vectors and arrays   CHANGE name closer to GlobalToLocal?

333:    Obtaining vectors
334:    -----------------
335:       DMCreateGlobal/Local
336:       DMGetGlobal/Local
337:       DMCompositeGetLocalVectors   - gives individual local work vectors and arrays


340: ?????   individual global vectors   ????

342: */

344: #if defined(PETSC_HAVE_HDF5)
345: PETSC_EXTERN PetscErrorCode DMSequenceLoad_HDF5_Internal(DM, const char *, PetscInt, PetscScalar *, PetscViewer);
346: #endif

348: PETSC_STATIC_INLINE PetscErrorCode DMGetLocalOffset_Private(DM dm, PetscInt point, PetscInt *start, PetscInt *end)
349: {
351: #if defined(PETSC_USE_DEBUG)
352:   {
353:     PetscInt       dof;
355:     *start = *end = 0; /* Silence overzealous compiler warning */
356:     if (!dm->localSection) SETERRQ(PetscObjectComm((PetscObject) dm), PETSC_ERR_ARG_WRONG, "DM must have a local section, see DMSetLocalSection()");
357:     PetscSectionGetOffset(dm->localSection, point, start);
358:     PetscSectionGetDof(dm->localSection, point, &dof);
359:     *end = *start + dof;
360:   }
361: #else
362:   {
363:     const PetscSection s = dm->localSection;
364:     *start = s->atlasOff[point - s->pStart];
365:     *end   = *start + s->atlasDof[point - s->pStart];
366:   }
367: #endif
368:   return(0);
369: }

371: PETSC_STATIC_INLINE PetscErrorCode DMGetLocalFieldOffset_Private(DM dm, PetscInt point, PetscInt field, PetscInt *start, PetscInt *end)
372: {
374: #if defined(PETSC_USE_DEBUG)
375:   {
376:     PetscInt       dof;
378:     *start = *end = 0; /* Silence overzealous compiler warning */
379:     if (!dm->localSection) SETERRQ(PetscObjectComm((PetscObject) dm), PETSC_ERR_ARG_WRONG, "DM must have a local section, see DMSetLocalSection()");
380:     PetscSectionGetFieldOffset(dm->localSection, point, field, start);
381:     PetscSectionGetFieldDof(dm->localSection, point, field, &dof);
382:     *end = *start + dof;
383:   }
384: #else
385:   {
386:     const PetscSection s = dm->localSection->field[field];
387:     *start = s->atlasOff[point - s->pStart];
388:     *end   = *start + s->atlasDof[point - s->pStart];
389:   }
390: #endif
391:   return(0);
392: }

394: PETSC_STATIC_INLINE PetscErrorCode DMGetGlobalOffset_Private(DM dm, PetscInt point, PetscInt *start, PetscInt *end)
395: {
397: #if defined(PETSC_USE_DEBUG)
398:   {
400:     PetscInt       dof,cdof;
401:     *start = *end = 0; /* Silence overzealous compiler warning */
402:     if (!dm->localSection) SETERRQ(PetscObjectComm((PetscObject) dm), PETSC_ERR_ARG_WRONG, "DM must have a local section, see DMSetLocalSection()");
403:     if (!dm->globalSection) SETERRQ(PetscObjectComm((PetscObject) dm), PETSC_ERR_ARG_WRONG, "DM must have a global section. It will be created automatically by DMGetGlobalSection()");
404:     PetscSectionGetOffset(dm->globalSection, point, start);
405:     PetscSectionGetDof(dm->globalSection, point, &dof);
406:     PetscSectionGetConstraintDof(dm->globalSection, point, &cdof);
407:     *end = *start + dof - cdof + (dof < 0 ? 1 : 0);
408:   }
409: #else
410:   {
411:     const PetscSection s    = dm->globalSection;
412:     const PetscInt     dof  = s->atlasDof[point - s->pStart];
413:     const PetscInt     cdof = s->bc ? s->bc->atlasDof[point - s->bc->pStart] : 0;
414:     *start = s->atlasOff[point - s->pStart];
415:     *end   = *start + dof - cdof + (dof < 0 ? 1 : 0);
416:   }
417: #endif
418:   return(0);
419: }

421: PETSC_STATIC_INLINE PetscErrorCode DMGetGlobalFieldOffset_Private(DM dm, PetscInt point, PetscInt field, PetscInt *start, PetscInt *end)
422: {
424: #if defined(PETSC_USE_DEBUG)
425:   {
426:     PetscInt       loff, lfoff, fdof, fcdof, ffcdof, f;
428:     *start = *end = 0; /* Silence overzealous compiler warning */
429:     if (!dm->localSection) SETERRQ(PetscObjectComm((PetscObject) dm), PETSC_ERR_ARG_WRONG, "DM must have a local section, see DMSetLocalSection()");
430:     if (!dm->globalSection) SETERRQ(PetscObjectComm((PetscObject) dm), PETSC_ERR_ARG_WRONG, "DM must have a global section. It will be crated automatically by DMGetGlobalSection()");
431:     PetscSectionGetOffset(dm->globalSection, point, start);
432:     PetscSectionGetOffset(dm->localSection, point, &loff);
433:     PetscSectionGetFieldOffset(dm->localSection, point, field, &lfoff);
434:     PetscSectionGetFieldDof(dm->localSection, point, field, &fdof);
435:     PetscSectionGetFieldConstraintDof(dm->localSection, point, field, &fcdof);
436:     *start = *start < 0 ? *start - (lfoff-loff) : *start + lfoff-loff;
437:     for (f = 0; f < field; ++f) {
438:       PetscSectionGetFieldConstraintDof(dm->localSection, point, f, &ffcdof);
439:       *start = *start < 0 ? *start + ffcdof : *start - ffcdof;
440:     }
441:     *end   = *start < 0 ? *start - (fdof-fcdof) : *start + fdof-fcdof;
442:   }
443: #else
444:   {
445:     const PetscSection s     = dm->localSection;
446:     const PetscSection fs    = dm->localSection->field[field];
447:     const PetscSection gs    = dm->globalSection;
448:     const PetscInt     loff  = s->atlasOff[point - s->pStart];
449:     const PetscInt     goff  = gs->atlasOff[point - s->pStart];
450:     const PetscInt     lfoff = fs->atlasOff[point - s->pStart];
451:     const PetscInt     fdof  = fs->atlasDof[point - s->pStart];
452:     const PetscInt     fcdof = fs->bc ? fs->bc->atlasDof[point - fs->bc->pStart] : 0;
453:     PetscInt           ffcdof = 0, f;

455:     for (f = 0; f < field; ++f) {
456:       const PetscSection ffs = dm->localSection->field[f];
457:       ffcdof += ffs->bc ? ffs->bc->atlasDof[point - ffs->bc->pStart] : 0;
458:     }
459:     *start = goff + (goff < 0 ? loff-lfoff + ffcdof : lfoff-loff - ffcdof);
460:     *end   = *start < 0 ? *start - (fdof-fcdof) : *start + fdof-fcdof;
461:   }
462: #endif
463:   return(0);
464: }

466: PETSC_EXTERN PetscErrorCode DMGetBasisTransformDM_Internal(DM, DM *);
467: PETSC_EXTERN PetscErrorCode DMGetBasisTransformVec_Internal(DM, Vec *);
468: PETSC_INTERN PetscErrorCode DMConstructBasisTransform_Internal(DM);

470: PETSC_INTERN PetscErrorCode DMGetLocalBoundingIndices_DMDA(DM, PetscReal[], PetscReal[]);
471: PETSC_INTERN PetscErrorCode DMSetField_Internal(DM, PetscInt, DMLabel, PetscObject);

473: #endif