Date: 2026-05-01T06:12:03+00:00

Actual source code: dmsnes.c

      1: #include <petsc/private/snesimpl.h>
      2: #include <petsc/private/dmimpl.h>

      4: static PetscErrorCode DMSNESUnsetFunctionContext_DMSNES(DMSNES sdm)
      5: {
      6:   PetscFunctionBegin;
      7:   PetscCall(PetscObjectCompose((PetscObject)sdm, "function ctx", NULL));
      8:   sdm->functionctxcontainer = NULL;
      9:   PetscFunctionReturn(PETSC_SUCCESS);
     10: }

     12: static PetscErrorCode DMSNESUnsetJacobianContext_DMSNES(DMSNES sdm)
     13: {
     14:   PetscFunctionBegin;
     15:   PetscCall(PetscObjectCompose((PetscObject)sdm, "jacobian ctx", NULL));
     16:   sdm->jacobianctxcontainer = NULL;
     17:   PetscFunctionReturn(PETSC_SUCCESS);
     18: }

     20: static PetscErrorCode DMSNESDestroy(DMSNES *kdm)
     21: {
     22:   PetscFunctionBegin;
     23:   if (!*kdm) PetscFunctionReturn(PETSC_SUCCESS);
     25:   if (--((PetscObject)*kdm)->refct > 0) {
     26:     *kdm = NULL;
     27:     PetscFunctionReturn(PETSC_SUCCESS);
     28:   }
     29:   PetscCall(DMSNESUnsetFunctionContext_DMSNES(*kdm));
     30:   PetscCall(DMSNESUnsetJacobianContext_DMSNES(*kdm));
     31:   PetscTryTypeMethod(*kdm, destroy);
     32:   PetscCall(PetscHeaderDestroy(kdm));
     33:   PetscFunctionReturn(PETSC_SUCCESS);
     34: }

     36: PetscErrorCode DMSNESLoad(DMSNES kdm, PetscViewer viewer)
     37: {
     38:   PetscFunctionBegin;
     39:   PetscCall(PetscViewerBinaryRead(viewer, &kdm->ops->computefunction, 1, NULL, PETSC_FUNCTION));
     40:   PetscCall(PetscViewerBinaryRead(viewer, &kdm->ops->computejacobian, 1, NULL, PETSC_FUNCTION));
     41:   PetscFunctionReturn(PETSC_SUCCESS);
     42: }

     44: PetscErrorCode DMSNESView(DMSNES kdm, PetscViewer viewer)
     45: {
     46:   PetscBool isascii, isbinary;

     48:   PetscFunctionBegin;
     49:   PetscCall(PetscObjectTypeCompare((PetscObject)viewer, PETSCVIEWERASCII, &isascii));
     50:   PetscCall(PetscObjectTypeCompare((PetscObject)viewer, PETSCVIEWERBINARY, &isbinary));
     51:   if (isascii) {
     52: #if defined(PETSC_SERIALIZE_FUNCTIONS)
     53:     const char *fname;

     55:     PetscCall(PetscFPTFind(kdm->ops->computefunction, &fname));
     56:     if (fname) PetscCall(PetscViewerASCIIPrintf(viewer, "Function used by SNES: %s\n", fname));
     57:     PetscCall(PetscFPTFind(kdm->ops->computejacobian, &fname));
     58:     if (fname) PetscCall(PetscViewerASCIIPrintf(viewer, "Jacobian function used by SNES: %s\n", fname));
     59: #endif
     60:   } else if (isbinary) {
     61:     struct {
     62:       SNESFunctionFn *func;
     63:     } funcstruct;
     64:     struct {
     65:       SNESJacobianFn *jac;
     66:     } jacstruct;
     67:     funcstruct.func = kdm->ops->computefunction;
     68:     jacstruct.jac   = kdm->ops->computejacobian;
     69:     PetscCall(PetscViewerBinaryWrite(viewer, &funcstruct, 1, PETSC_FUNCTION));
     70:     PetscCall(PetscViewerBinaryWrite(viewer, &jacstruct, 1, PETSC_FUNCTION));
     71:   }
     72:   PetscFunctionReturn(PETSC_SUCCESS);
     73: }

     75: static PetscErrorCode DMSNESCreate(MPI_Comm comm, DMSNES *kdm)
     76: {
     77:   PetscFunctionBegin;
     78:   PetscCall(SNESInitializePackage());
     79:   PetscCall(PetscHeaderCreate(*kdm, DMSNES_CLASSID, "DMSNES", "DMSNES", "DMSNES", comm, DMSNESDestroy, DMSNESView));
     80:   PetscFunctionReturn(PETSC_SUCCESS);
     81: }

     83: /* Attaches the DMSNES to the coarse level.
     84:  * Under what conditions should we copy versus duplicate?
     85:  */
     86: static PetscErrorCode DMCoarsenHook_DMSNES(DM dm, DM dmc, PetscCtx ctx)
     87: {
     88:   PetscFunctionBegin;
     89:   PetscCall(DMCopyDMSNES(dm, dmc));
     90:   PetscFunctionReturn(PETSC_SUCCESS);
     91: }

     93: /* This could restrict auxiliary information to the coarse level.
     94:  */
     95: static PetscErrorCode DMRestrictHook_DMSNES(DM dm, Mat Restrict, Vec rscale, Mat Inject, DM dmc, PetscCtx ctx)
     96: {
     97:   PetscFunctionBegin;
     98:   PetscFunctionReturn(PETSC_SUCCESS);
     99: }

    101: /* Attaches the DMSNES to the subdomain. */
    102: static PetscErrorCode DMSubDomainHook_DMSNES(DM dm, DM subdm, PetscCtx ctx)
    103: {
    104:   PetscFunctionBegin;
    105:   PetscCall(DMCopyDMSNES(dm, subdm));
    106:   PetscFunctionReturn(PETSC_SUCCESS);
    107: }

    109: /* This could restrict auxiliary information to the coarse level.
    110:  */
    111: static PetscErrorCode DMSubDomainRestrictHook_DMSNES(DM dm, VecScatter gscat, VecScatter lscat, DM subdm, PetscCtx ctx)
    112: {
    113:   PetscFunctionBegin;
    114:   PetscFunctionReturn(PETSC_SUCCESS);
    115: }

    117: static PetscErrorCode DMRefineHook_DMSNES(DM dm, DM dmf, PetscCtx ctx)
    118: {
    119:   PetscFunctionBegin;
    120:   PetscCall(DMCopyDMSNES(dm, dmf));
    121:   PetscFunctionReturn(PETSC_SUCCESS);
    122: }

    124: /* This could restrict auxiliary information to the coarse level.
    125:  */
    126: static PetscErrorCode DMInterpolateHook_DMSNES(DM dm, Mat Interp, DM dmf, PetscCtx ctx)
    127: {
    128:   PetscFunctionBegin;
    129:   PetscFunctionReturn(PETSC_SUCCESS);
    130: }

    132: /*
    133:   DMSNESCopy - copies the information in a `DMSNES` to another `DMSNES`

    135:   Not Collective

    137:   Input Parameters:
    138: + kdm  - Original `DMSNES`
    139: - nkdm - `DMSNES` to receive the data, should have been created with `DMSNESCreate()`

    141:   Level: developer

    143: .seealso: [](ch_snes), `DMSNES`, `DMSNESCreate()`, `DMSNESDestroy()`
    144: */
    145: static PetscErrorCode DMSNESCopy(DMSNES kdm, DMSNES nkdm)
    146: {
    147:   PetscFunctionBegin;
    150:   nkdm->ops->computefunction  = kdm->ops->computefunction;
    151:   nkdm->ops->computejacobian  = kdm->ops->computejacobian;
    152:   nkdm->ops->computegs        = kdm->ops->computegs;
    153:   nkdm->ops->computeobjective = kdm->ops->computeobjective;
    154:   nkdm->ops->computepjacobian = kdm->ops->computepjacobian;
    155:   nkdm->ops->computepfunction = kdm->ops->computepfunction;
    156:   nkdm->ops->destroy          = kdm->ops->destroy;
    157:   nkdm->ops->duplicate        = kdm->ops->duplicate;

    159:   nkdm->gsctx                = kdm->gsctx;
    160:   nkdm->pctx                 = kdm->pctx;
    161:   nkdm->objectivectx         = kdm->objectivectx;
    162:   nkdm->originaldm           = kdm->originaldm;
    163:   nkdm->functionctxcontainer = kdm->functionctxcontainer;
    164:   nkdm->jacobianctxcontainer = kdm->jacobianctxcontainer;
    165:   if (nkdm->functionctxcontainer) PetscCall(PetscObjectCompose((PetscObject)nkdm, "function ctx", (PetscObject)nkdm->functionctxcontainer));
    166:   if (nkdm->jacobianctxcontainer) PetscCall(PetscObjectCompose((PetscObject)nkdm, "jacobian ctx", (PetscObject)nkdm->jacobianctxcontainer));

    168:   /*
    169:   nkdm->fortran_func_pointers[0] = kdm->fortran_func_pointers[0];
    170:   nkdm->fortran_func_pointers[1] = kdm->fortran_func_pointers[1];
    171:   nkdm->fortran_func_pointers[2] = kdm->fortran_func_pointers[2];
    172:   */

    174:   /* implementation specific copy hooks */
    175:   PetscTryTypeMethod(kdm, duplicate, nkdm);
    176:   PetscFunctionReturn(PETSC_SUCCESS);
    177: }

    179: /*@C
    180:   DMGetDMSNES - get read-only private `DMSNES` context from a `DM`

    182:   Not Collective

    184:   Input Parameter:
    185: . dm - `DM` to be used with `SNES`

    187:   Output Parameter:
    188: . snesdm - private `DMSNES` context

    190:   Level: developer

    192:   Note:
    193:   Use `DMGetDMSNESWrite()` if write access is needed. The DMSNESSetXXX API should be used wherever possible.

    195: .seealso: [](ch_snes), `DMSNES`, `DMGetDMSNESWrite()`
    196: @*/
    197: PetscErrorCode DMGetDMSNES(DM dm, DMSNES *snesdm)
    198: {
    199:   PetscFunctionBegin;
    201:   *snesdm = (DMSNES)dm->dmsnes;
    202:   if (!*snesdm) {
    203:     PetscCall(PetscInfo(dm, "Creating new DMSNES\n"));
    204:     PetscCall(DMSNESCreate(PetscObjectComm((PetscObject)dm), snesdm));

    206:     dm->dmsnes            = (PetscObject)*snesdm;
    207:     (*snesdm)->originaldm = dm;
    208:     PetscCall(DMCoarsenHookAdd(dm, DMCoarsenHook_DMSNES, DMRestrictHook_DMSNES, NULL));
    209:     PetscCall(DMRefineHookAdd(dm, DMRefineHook_DMSNES, DMInterpolateHook_DMSNES, NULL));
    210:     PetscCall(DMSubDomainHookAdd(dm, DMSubDomainHook_DMSNES, DMSubDomainRestrictHook_DMSNES, NULL));
    211:   }
    212:   PetscFunctionReturn(PETSC_SUCCESS);
    213: }

    215: /*@C
    216:   DMGetDMSNESWrite - get write access to private `DMSNES` context from a `DM`

    218:   Not Collective

    220:   Input Parameter:
    221: . dm - `DM` to be used with `SNES`

    223:   Output Parameter:
    224: . snesdm - private `DMSNES` context

    226:   Level: developer

    228: .seealso: [](ch_snes), `DMSNES`, `DMGetDMSNES()`
    229: @*/
    230: PetscErrorCode DMGetDMSNESWrite(DM dm, DMSNES *snesdm)
    231: {
    232:   DMSNES sdm;

    234:   PetscFunctionBegin;
    236:   PetscCall(DMGetDMSNES(dm, &sdm));
    237:   PetscCheck(sdm->originaldm, PETSC_COMM_SELF, PETSC_ERR_ARG_WRONGSTATE, "DMSNES has a NULL originaldm");
    238:   if (sdm->originaldm != dm) { /* Copy on write */
    239:     DMSNES oldsdm = sdm;
    240:     PetscCall(PetscInfo(dm, "Copying DMSNES due to write\n"));
    241:     PetscCall(DMSNESCreate(PetscObjectComm((PetscObject)dm), &sdm));
    242:     PetscCall(DMSNESCopy(oldsdm, sdm));
    243:     PetscCall(DMSNESDestroy((DMSNES *)&dm->dmsnes));
    244:     dm->dmsnes      = (PetscObject)sdm;
    245:     sdm->originaldm = dm;
    246:   }
    247:   *snesdm = sdm;
    248:   PetscFunctionReturn(PETSC_SUCCESS);
    249: }

    251: /*@
    252:   DMCopyDMSNES - copies a `DMSNES` context to a new `DM`

    254:   Logically Collective

    256:   Input Parameters:
    257: + dmsrc  - `DM` to obtain context from
    258: - dmdest - `DM` to add context to

    260:   Level: developer

    262:   Note:
    263:   The context is copied by reference. This function does not ensure that a context exists.

    265: .seealso: [](ch_snes), `DMSNES`, `DMGetDMSNES()`, `SNESSetDM()`
    266: @*/
    267: PetscErrorCode DMCopyDMSNES(DM dmsrc, DM dmdest)
    268: {
    269:   PetscFunctionBegin;
    272:   if (!dmdest->dmsnes) PetscCall(DMSNESCreate(PetscObjectComm((PetscObject)dmdest), (DMSNES *)&dmdest->dmsnes));
    273:   PetscCall(DMSNESCopy((DMSNES)dmsrc->dmsnes, (DMSNES)dmdest->dmsnes));
    274:   PetscCall(DMCoarsenHookAdd(dmdest, DMCoarsenHook_DMSNES, NULL, NULL));
    275:   PetscCall(DMRefineHookAdd(dmdest, DMRefineHook_DMSNES, NULL, NULL));
    276:   PetscCall(DMSubDomainHookAdd(dmdest, DMSubDomainHook_DMSNES, DMSubDomainRestrictHook_DMSNES, NULL));
    277:   PetscFunctionReturn(PETSC_SUCCESS);
    278: }

    280: /*@C
    281:   DMSNESSetFunction - set `SNES` residual evaluation function

    283:   Not Collective

    285:   Input Parameters:
    286: + dm  - DM to be used with `SNES`
    287: . f   - residual evaluation function; see `SNESFunctionFn` for calling sequence
    288: - ctx - context for residual evaluation

    290:   Level: developer

    292:   Note:
    293:   `SNESSetFunction()` is normally used, but it calls this function internally because the user context is actually
    294:   associated with the `DM`.  This makes the interface consistent regardless of whether the user interacts with a `DM` or
    295:   not.

    297:   Developer Note:
    298:   If `DM` took a more central role at some later date, this could become the primary method of setting the residual.

    300: .seealso: [](ch_snes), `DMSNES`, `DMSNESSetContext()`, `SNESSetFunction()`, `DMSNESSetJacobian()`, `SNESFunctionFn`
    301: @*/
    302: PetscErrorCode DMSNESSetFunction(DM dm, SNESFunctionFn *f, PetscCtx ctx)
    303: {
    304:   DMSNES sdm;

    306:   PetscFunctionBegin;
    308:   PetscCall(DMGetDMSNESWrite(dm, &sdm));
    309:   if (f) sdm->ops->computefunction = f;
    310:   if (ctx) {
    311:     PetscContainer ctxcontainer;
    312:     PetscCall(PetscContainerCreate(PetscObjectComm((PetscObject)sdm), &ctxcontainer));
    313:     PetscCall(PetscContainerSetPointer(ctxcontainer, ctx));
    314:     PetscCall(PetscObjectCompose((PetscObject)sdm, "function ctx", (PetscObject)ctxcontainer));
    315:     sdm->functionctxcontainer = ctxcontainer;
    316:     PetscCall(PetscContainerDestroy(&ctxcontainer));
    317:   }
    318:   PetscFunctionReturn(PETSC_SUCCESS);
    319: }

    321: /*@C
    322:   DMSNESSetFunctionContextDestroy - set `SNES` residual evaluation context destroy function

    324:   Not Collective

    326:   Input Parameters:
    327: + dm - `DM` to be used with `SNES`
    328: - f  - residual evaluation context destroy function, see `PetscCtxDestroyFn` for its calling sequence

    330:   Level: developer

    332: .seealso: [](ch_snes), `DMSNES`, `DMSNESSetFunction()`, `SNESSetFunction()`, `PetscCtxDestroyFn`
    333: @*/
    334: PetscErrorCode DMSNESSetFunctionContextDestroy(DM dm, PetscCtxDestroyFn *f)
    335: {
    336:   DMSNES sdm;

    338:   PetscFunctionBegin;
    340:   PetscCall(DMGetDMSNESWrite(dm, &sdm));
    341:   if (sdm->functionctxcontainer) PetscCall(PetscContainerSetCtxDestroy(sdm->functionctxcontainer, f));
    342:   PetscFunctionReturn(PETSC_SUCCESS);
    343: }

    345: PetscErrorCode DMSNESUnsetFunctionContext_Internal(DM dm)
    346: {
    347:   DMSNES sdm;

    349:   PetscFunctionBegin;
    351:   PetscCall(DMGetDMSNESWrite(dm, &sdm));
    352:   PetscCall(DMSNESUnsetFunctionContext_DMSNES(sdm));
    353:   PetscFunctionReturn(PETSC_SUCCESS);
    354: }

    356: /*@C
    357:   DMSNESSetMFFunction - set `SNES` residual evaluation function used in applying the matrix-free Jacobian with `-snes_mf_operator`

    359:   Logically Collective

    361:   Input Parameters:
    362: + dm   - `DM` to be used with `SNES`
    363: . func - residual evaluation function; see `SNESFunctionFn` for calling sequence
    364: - ctx  - optional function context

    366:   Level: developer

    368:   Note:
    369:   If not provided then the function provided with `SNESSetFunction()` is used

    371: .seealso: [](ch_snes), `DMSNES`, `DMSNESSetContext()`, `SNESSetFunction()`, `DMSNESSetJacobian()`, `DMSNESSetFunction()`, `SNESFunctionFn`
    372: @*/
    373: PetscErrorCode DMSNESSetMFFunction(DM dm, SNESFunctionFn *func, PetscCtx ctx)
    374: {
    375:   DMSNES sdm;

    377:   PetscFunctionBegin;
    379:   if (func || ctx) PetscCall(DMGetDMSNESWrite(dm, &sdm));
    380:   if (func) sdm->ops->computemffunction = func;
    381:   if (ctx) sdm->mffunctionctx = ctx;
    382:   PetscFunctionReturn(PETSC_SUCCESS);
    383: }

    385: /*@C
    386:   DMSNESGetFunction - get `SNES` residual evaluation function from a `DMSNES` object

    388:   Not Collective

    390:   Input Parameter:
    391: . dm - `DM` to be used with `SNES`

    393:   Output Parameters:
    394: + f   - residual evaluation function; see `SNESFunctionFn` for calling sequence
    395: - ctx - context for residual evaluation

    397:   Level: developer

    399:   Note:
    400:   `SNESGetFunction()` is normally used, but it calls this function internally because the user context is actually
    401:   associated with the `DM`.

    403: .seealso: [](ch_snes), `DMSNES`, `DMSNESSetContext()`, `DMSNESSetFunction()`, `SNESSetFunction()`, `SNESFunctionFn`
    404: @*/
    405: PetscErrorCode DMSNESGetFunction(DM dm, SNESFunctionFn **f, PetscCtxRt ctx)
    406: {
    407:   DMSNES sdm;

    409:   PetscFunctionBegin;
    411:   PetscCall(DMGetDMSNES(dm, &sdm));
    412:   if (f) *f = sdm->ops->computefunction;
    413:   if (ctx) {
    414:     if (sdm->functionctxcontainer) PetscCall(PetscContainerGetPointer(sdm->functionctxcontainer, ctx));
    415:     else *(void **)ctx = NULL;
    416:   }
    417:   PetscFunctionReturn(PETSC_SUCCESS);
    418: }

    420: /*@C
    421:   DMSNESSetObjective - Sets the objective function minimized by some of the `SNES` linesearch methods into a `DMSNES` object, used instead of the 2-norm of the residual

    423:   Not Collective

    425:   Input Parameters:
    426: + dm  - `DM` to be used with `SNES`
    427: . obj - objective evaluation routine; see `SNESObjectiveFn` for the calling sequence
    428: - ctx - [optional] user-defined context for private data for the objective evaluation routine (may be `NULL`)

    430:   Level: developer

    432: .seealso: [](ch_snes), `DMSNES`, `DMSNESSetContext()`, `SNESGetObjective()`, `DMSNESSetFunction()`, `SNESObjectiveFn`
    433: @*/
    434: PetscErrorCode DMSNESSetObjective(DM dm, SNESObjectiveFn *obj, PetscCtx ctx)
    435: {
    436:   DMSNES sdm;

    438:   PetscFunctionBegin;
    440:   if (obj || ctx) PetscCall(DMGetDMSNESWrite(dm, &sdm));
    441:   if (obj) sdm->ops->computeobjective = obj;
    442:   if (ctx) sdm->objectivectx = ctx;
    443:   PetscFunctionReturn(PETSC_SUCCESS);
    444: }

    446: /*@C
    447:   DMSNESGetObjective - Returns the objective function set with `DMSNESSetObjective()`

    449:   Not Collective

    451:   Input Parameter:
    452: . dm - `DM` to be used with `SNES`

    454:   Output Parameters:
    455: + obj - objective evaluation routine (or `NULL`); see `SNESObjectiveFn` for the calling sequence
    456: - ctx - the function context (or `NULL`)

    458:   Level: developer

    460:   Note:
    461:   `SNESGetFunction()` is normally used, but it calls this function internally because the user context is actually
    462:   associated with the `DM`.

    464: .seealso: [](ch_snes), `DMSNES`, `DMSNESSetContext()`, `DMSNESSetObjective()`, `SNESSetFunction()`, `SNESObjectiveFn`
    465: @*/
    466: PetscErrorCode DMSNESGetObjective(DM dm, SNESObjectiveFn **obj, PetscCtxRt ctx)
    467: {
    468:   DMSNES sdm;

    470:   PetscFunctionBegin;
    472:   PetscCall(DMGetDMSNES(dm, &sdm));
    473:   if (obj) *obj = sdm->ops->computeobjective;
    474:   if (ctx) *(void **)ctx = sdm->objectivectx;
    475:   PetscFunctionReturn(PETSC_SUCCESS);
    476: }

    478: /*@C
    479:   DMSNESSetNGS - set `SNES` Gauss-Seidel relaxation function into a `DMSNES` object

    481:   Not Collective

    483:   Input Parameters:
    484: + dm  - `DM` to be used with `SNES`
    485: . f   - relaxation function, see `SNESGSFunction`
    486: - ctx - context for residual evaluation

    488:   Level: developer

    490:   Note:
    491:   `SNESSetNGS()` is normally used, but it calls this function internally because the user context is actually
    492:   associated with the `DM`.  This makes the interface consistent regardless of whether the user interacts with a `DM` or
    493:   not.

    495:   Developer Note:
    496:   If `DM` took a more central role at some later date, this could become the primary method of supplying the smoother

    498: .seealso: [](ch_snes), `DMSNES`, `DMSNESSetContext()`, `SNESSetFunction()`, `DMSNESSetJacobian()`, `DMSNESSetFunction()`, `SNESGSFunction`
    499: @*/
    500: PetscErrorCode DMSNESSetNGS(DM dm, PetscErrorCode (*f)(SNES, Vec, Vec, void *), PetscCtx ctx)
    501: {
    502:   DMSNES sdm;

    504:   PetscFunctionBegin;
    506:   if (f || ctx) PetscCall(DMGetDMSNESWrite(dm, &sdm));
    507:   if (f) sdm->ops->computegs = f;
    508:   if (ctx) sdm->gsctx = ctx;
    509:   PetscFunctionReturn(PETSC_SUCCESS);
    510: }

    512: /*@C
    513:   DMSNESGetNGS - get `SNES` Gauss-Seidel relaxation function from a `DMSNES` object

    515:   Not Collective

    517:   Input Parameter:
    518: . dm - `DM` to be used with `SNES`

    520:   Output Parameters:
    521: + f   - relaxation function which performs Gauss-Seidel sweeps, see `SNESSetNGS()`
    522: - ctx - context for residual evaluation

    524:   Level: developer

    526:   Note:
    527:   `SNESGetNGS()` is normally used, but it calls this function internally because the user context is actually
    528:   associated with the `DM`.

    530:   Developer Note:
    531:   This makes the interface consistent regardless of whether the user interacts with a `DM` or
    532:   not. If `DM` took a more central role at some later date, this could become the primary method of setting the residual.

    534: .seealso: [](ch_snes), `DMSNES`, `DMSNESSetContext()`, `SNESGetNGS()`, `DMSNESGetJacobian()`, `DMSNESGetFunction()`
    535: @*/
    536: PetscErrorCode DMSNESGetNGS(DM dm, PetscErrorCode (**f)(SNES, Vec, Vec, void *), PetscCtxRt ctx)
    537: {
    538:   DMSNES sdm;

    540:   PetscFunctionBegin;
    542:   PetscCall(DMGetDMSNES(dm, &sdm));
    543:   if (f) *f = sdm->ops->computegs;
    544:   if (ctx) *(void **)ctx = sdm->gsctx;
    545:   PetscFunctionReturn(PETSC_SUCCESS);
    546: }

    548: /*@C
    549:   DMSNESSetJacobian - set `SNES` Jacobian evaluation function into a `DMSNES` object

    551:   Not Collective

    553:   Input Parameters:
    554: + dm  - `DM` to be used with `SNES`
    555: . J   - Jacobian evaluation function, see `SNESJacobianFn`
    556: - ctx - context for Jacobian evaluation

    558:   Level: developer

    560:   Note:
    561:   `SNESSetJacobian()` is normally used, but it calls this function internally because the user context is actually
    562:   associated with the `DM`.

    564:   Developer Note:
    565:   This makes the interface consistent regardless of whether the user interacts with a `DM` or
    566:   not. If `DM` took a more central role at some later date, this could become the primary method of setting the Jacobian.

    568: .seealso: [](ch_snes), `DMSNES`, `DMSNESSetContext()`, `SNESSetFunction()`, `DMSNESGetJacobian()`, `SNESSetJacobian()`, `SNESJacobianFn`
    569: @*/
    570: PetscErrorCode DMSNESSetJacobian(DM dm, SNESJacobianFn *J, PetscCtx ctx)
    571: {
    572:   DMSNES sdm;

    574:   PetscFunctionBegin;
    576:   if (J || ctx) PetscCall(DMGetDMSNESWrite(dm, &sdm));
    577:   if (J) sdm->ops->computejacobian = J;
    578:   if (ctx) {
    579:     PetscContainer ctxcontainer;
    580:     PetscCall(PetscContainerCreate(PetscObjectComm((PetscObject)sdm), &ctxcontainer));
    581:     PetscCall(PetscContainerSetPointer(ctxcontainer, ctx));
    582:     PetscCall(PetscObjectCompose((PetscObject)sdm, "jacobian ctx", (PetscObject)ctxcontainer));
    583:     sdm->jacobianctxcontainer = ctxcontainer;
    584:     PetscCall(PetscContainerDestroy(&ctxcontainer));
    585:   }
    586:   PetscFunctionReturn(PETSC_SUCCESS);
    587: }

    589: /*@C
    590:   DMSNESSetJacobianContextDestroy - set `SNES` Jacobian evaluation context destroy function into a `DMSNES` object

    592:   Not Collective

    594:   Input Parameters:
    595: + dm - `DM` to be used with `SNES`
    596: - f  - Jacobian evaluation context destroy function, see `PetscCtxDestroyFn` for its calling sequence

    598:   Level: developer

    600: .seealso: [](ch_snes), `DMSNES`, `DMSNESSetJacobian()`
    601: @*/
    602: PetscErrorCode DMSNESSetJacobianContextDestroy(DM dm, PetscCtxDestroyFn *f)
    603: {
    604:   DMSNES sdm;

    606:   PetscFunctionBegin;
    608:   PetscCall(DMGetDMSNESWrite(dm, &sdm));
    609:   if (sdm->jacobianctxcontainer) PetscCall(PetscContainerSetCtxDestroy(sdm->jacobianctxcontainer, f));
    610:   PetscFunctionReturn(PETSC_SUCCESS);
    611: }

    613: PetscErrorCode DMSNESUnsetJacobianContext_Internal(DM dm)
    614: {
    615:   DMSNES sdm;

    617:   PetscFunctionBegin;
    619:   PetscCall(DMGetDMSNESWrite(dm, &sdm));
    620:   PetscCall(DMSNESUnsetJacobianContext_DMSNES(sdm));
    621:   PetscFunctionReturn(PETSC_SUCCESS);
    622: }

    624: /*@C
    625:   DMSNESGetJacobian - get `SNES` Jacobian evaluation function from a `DMSNES` object

    627:   Not Collective

    629:   Input Parameter:
    630: . dm - `DM` to be used with `SNES`

    632:   Output Parameters:
    633: + J   - Jacobian evaluation function; for all calling sequence see `SNESJacobianFn`
    634: - ctx - context for residual evaluation

    636:   Level: developer

    638:   Note:
    639:   `SNESGetJacobian()` is normally used, but it calls this function internally because the user context is actually
    640:   associated with the `DM`.  This makes the interface consistent regardless of whether the user interacts with a `DM` or
    641:   not.

    643:   Developer Note:
    644:   If `DM` took a more central role at some later date, this could become the primary method of setting the Jacobian.

    646: .seealso: [](ch_snes), `DMSNES`, `DMSNESSetContext()`, `SNESSetFunction()`, `DMSNESSetJacobian()`, `SNESJacobianFn`
    647: @*/
    648: PetscErrorCode DMSNESGetJacobian(DM dm, SNESJacobianFn **J, PetscCtxRt ctx)
    649: {
    650:   DMSNES sdm;

    652:   PetscFunctionBegin;
    654:   PetscCall(DMGetDMSNES(dm, &sdm));
    655:   if (J) *J = sdm->ops->computejacobian;
    656:   if (ctx) {
    657:     if (sdm->jacobianctxcontainer) PetscCall(PetscContainerGetPointer(sdm->jacobianctxcontainer, ctx));
    658:     else *(void **)ctx = NULL;
    659:   }
    660:   PetscFunctionReturn(PETSC_SUCCESS);
    661: }

    663: /*@C
    664:   DMSNESSetPicard - set SNES Picard iteration matrix and RHS evaluation functions into a `DMSNES` object

    666:   Not Collective

    668:   Input Parameters:
    669: + dm  - `DM` to be used with `SNES`
    670: . b   - RHS evaluation function; see `SNESFunctionFn` for calling sequence
    671: . J   - Picard matrix evaluation function; see `SNESJacobianFn` for calling sequence
    672: - ctx - context for residual and matrix evaluation

    674:   Level: developer

    676: .seealso: [](ch_snes), `DMSNES`, `SNESSetPicard()`, `DMSNESSetFunction()`, `DMSNESSetJacobian()`, `SNESFunctionFn`, `SNESJacobianFn`
    677: @*/
    678: PetscErrorCode DMSNESSetPicard(DM dm, SNESFunctionFn *b, SNESJacobianFn *J, PetscCtx ctx)
    679: {
    680:   DMSNES sdm;

    682:   PetscFunctionBegin;
    684:   PetscCall(DMGetDMSNES(dm, &sdm));
    685:   if (b) sdm->ops->computepfunction = b;
    686:   if (J) sdm->ops->computepjacobian = J;
    687:   if (ctx) sdm->pctx = ctx;
    688:   PetscFunctionReturn(PETSC_SUCCESS);
    689: }

    691: /*@C
    692:   DMSNESGetPicard - get `SNES` Picard iteration evaluation functions from a `DMSNES` object

    694:   Not Collective

    696:   Input Parameter:
    697: . dm - `DM` to be used with `SNES`

    699:   Output Parameters:
    700: + b   - RHS evaluation function; see `SNESFunctionFn` for calling sequence
    701: . J   - Jacobian evaluation function; see `SNESJacobianFn` for calling sequence
    702: - ctx - context for residual and matrix evaluation

    704:   Level: developer

    706: .seealso: [](ch_snes), `DMSNES`, `DMSNESSetContext()`, `SNESSetFunction()`, `DMSNESSetJacobian()`, `SNESFunctionFn`, `SNESJacobianFn`
    707: @*/
    708: PetscErrorCode DMSNESGetPicard(DM dm, SNESFunctionFn **b, SNESJacobianFn **J, PetscCtxRt ctx)
    709: {
    710:   DMSNES sdm;

    712:   PetscFunctionBegin;
    714:   PetscCall(DMGetDMSNES(dm, &sdm));
    715:   if (b) *b = sdm->ops->computepfunction;
    716:   if (J) *J = sdm->ops->computepjacobian;
    717:   if (ctx) *(void **)ctx = sdm->pctx;
    718:   PetscFunctionReturn(PETSC_SUCCESS);
    719: }