Actual source code: sectionimpl.h
petsc-3.15.0 2021-03-30
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      1: #if !defined(PETSCSECTIONIMPL_H)
      2: #define PETSCSECTIONIMPL_H

      4: #include <petscsection.h>
      5: #include <petsc/private/petscimpl.h>
      6: #include <petsc/private/hashmap.h>

      8: typedef struct PetscSectionClosurePermKey {
      9:   PetscInt    depth, size;
     10: } PetscSectionClosurePermKey;
     11: typedef struct {
     12:   PetscInt *perm, *invPerm;
     13: } PetscSectionClosurePermVal;
     14: PETSC_STATIC_INLINE PetscHash_t PetscSectionClosurePermHash(PetscSectionClosurePermKey k) {
     15:   return PetscHashCombine(PetscHashInt(k.depth), PetscHashInt(k.size));
     16: }
     17: PETSC_STATIC_INLINE int PetscSectionClosurePermEqual(PetscSectionClosurePermKey k1, PetscSectionClosurePermKey k2) {
     18:   return k1.depth == k2.depth && k1.size == k2.size;
     19: }
     20: static PetscSectionClosurePermVal PetscSectionClosurePermVal_Empty = {NULL, NULL};
     21: PETSC_HASH_MAP(ClPerm, PetscSectionClosurePermKey, PetscSectionClosurePermVal, PetscSectionClosurePermHash, PetscSectionClosurePermEqual, PetscSectionClosurePermVal_Empty)

     23: struct _p_PetscSection {
     24:   PETSCHEADER(int);
     25:   PetscInt                      pStart, pEnd; /* The chart: all points are contained in [pStart, pEnd) */
     26:   IS                            perm;         /* A permutation of [0, pEnd-pStart) */
     27:   PetscBool                     pointMajor;   /* True if the offsets are point major, otherwise they are fieldMajor */
     28:   PetscInt                     *atlasDof;     /* Describes layout of storage, point --> # of values */
     29:   PetscInt                     *atlasOff;     /* Describes layout of storage, point --> offset into storage */
     30:   PetscInt                      maxDof;       /* Maximum dof on any point */
     31:   PetscSection                  bc;           /* Describes constraints, point --> # local dofs which are constrained */
     32:   PetscInt                     *bcIndices;    /* Local indices for constrained dofs */
     33:   PetscBool                     setup;

     35:   PetscInt                      numFields;    /* The number of fields making up the degrees of freedom */
     36:   char                        **fieldNames;   /* The field names */
     37:   PetscInt                     *numFieldComponents; /* The number of components in each field */
     38:   PetscSection                 *field;        /* A section describing the layout and constraints for each field */
     39:   PetscBool                     useFieldOff;  /* Use the field offsets directly for the global section, rather than the point offset */
     40:   char                        ***compNames;   /* The component names */

     42:   PetscObject                   clObj;        /* Key for the closure (right now we only have one) */
     43:   PetscClPerm                   clHash;       /* Hash of (depth, size) to perm and invPerm */
     44:   PetscSection                  clSection;    /* Section giving the number of points in each closure */
     45:   IS                            clPoints;     /* Points in each closure */
     46:   PetscSectionSym               sym;          /* Symmetries of the data */
     47: };

     49: struct _PetscSectionSymOps {
     50:   PetscErrorCode (*getpoints)(PetscSectionSym,PetscSection,PetscInt,const PetscInt *,const PetscInt **,const PetscScalar **);
     51:   PetscErrorCode (*destroy)(PetscSectionSym);
     52:   PetscErrorCode (*view)(PetscSectionSym,PetscViewer);
     53: };

     55: typedef struct _n_SymWorkLink *SymWorkLink;

     57: struct _n_SymWorkLink
     58: {
     59:   SymWorkLink         next;
     60:   const PetscInt    **perms;
     61:   const PetscScalar **rots;
     62:   PetscInt           numPoints;
     63: };

     65: struct _p_PetscSectionSym {
     66:   PETSCHEADER(struct _PetscSectionSymOps);
     67:   void *data;
     68:   SymWorkLink workin;
     69:   SymWorkLink workout;
     70: };

     72: PETSC_EXTERN PetscErrorCode PetscSectionSetClosurePermutation_Internal(PetscSection, PetscObject, PetscInt, PetscInt, PetscCopyMode, PetscInt *);
     73: PETSC_EXTERN PetscErrorCode PetscSectionGetClosurePermutation_Internal(PetscSection, PetscObject, PetscInt, PetscInt, const PetscInt *[]);
     74: PETSC_EXTERN PetscErrorCode PetscSectionGetClosureInversePermutation_Internal(PetscSection, PetscObject, PetscInt, PetscInt, const PetscInt *[]);
     75: PETSC_EXTERN PetscErrorCode ISIntersect_Caching_Internal(IS, IS, IS *);

     77: #endif