src/compiler/nir/nir_serialize.c

   1 /*
   2  * Copyright © 2017 Connor Abbott
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #include "nir_serialize.h"
  25 #include "nir_control_flow.h"
  26 #include "util/u_dynarray.h"
  27
  28 typedef struct {
  29    size_t blob_offset;
  30    nir_ssa_def *src;
  31    nir_block *block;
  32 } write_phi_fixup;
  33
  34 typedef struct {
  35    const nir_shader *nir;
  36
  37    struct blob *blob;
  38
  39    /* maps pointer to index */
  40    struct hash_table *remap_table;
  41
  42    /* the next index to assign to a NIR in-memory object */
  43    uintptr_t next_idx;
  44
  45    /* Array of write_phi_fixup structs representing phi sources that need to
  46     * be resolved in the second pass.
  47     */
  48    struct util_dynarray phi_fixups;
  49 } write_ctx;
  50
  51 typedef struct {
  52    nir_shader *nir;
  53
  54    struct blob_reader *blob;
  55
  56    /* the next index to assign to a NIR in-memory object */
  57    uintptr_t next_idx;
  58
  59    /* The length of the index -> object table */
  60    uintptr_t idx_table_len;
  61
  62    /* map from index to deserialized pointer */
  63    void **idx_table;
  64
  65    /* List of phi sources. */
  66    struct list_head phi_srcs;
  67
  68 } read_ctx;
  69
  70 static void
  71 write_add_object(write_ctx *ctx, const void *obj)
  72 {
  73    uintptr_t index = ctx->next_idx++;
  74    _mesa_hash_table_insert(ctx->remap_table, obj, (void *) index);
  75 }
  76
  77 static uintptr_t
  78 write_lookup_object(write_ctx *ctx, const void *obj)
  79 {
  80    struct hash_entry *entry = _mesa_hash_table_search(ctx->remap_table, obj);
  81    assert(entry);
  82    return (uintptr_t) entry->data;
  83 }
  84
  85 static void
  86 write_object(write_ctx *ctx, const void *obj)
  87 {
  88    blob_write_intptr(ctx->blob, write_lookup_object(ctx, obj));
  89 }
  90
  91 static void
  92 read_add_object(read_ctx *ctx, void *obj)
  93 {
  94    assert(ctx->next_idx < ctx->idx_table_len);
  95    ctx->idx_table[ctx->next_idx++] = obj;
  96 }
  97
  98 static void *
  99 read_lookup_object(read_ctx *ctx, uintptr_t idx)
 100 {
 101    assert(idx < ctx->idx_table_len);
 102    return ctx->idx_table[idx];
 103 }
 104
 105 static void *
 106 read_object(read_ctx *ctx)
 107 {
 108    return read_lookup_object(ctx, blob_read_intptr(ctx->blob));
 109 }
 110
 111 static void
 112 write_constant(write_ctx *ctx, const nir_constant *c)
 113 {
 114    blob_write_bytes(ctx->blob, c->values, sizeof(c->values));
 115    blob_write_uint32(ctx->blob, c->num_elements);
 116    for (unsigned i = 0; i < c->num_elements; i++)
 117       write_constant(ctx, c->elements[i]);
 118 }
 119
 120 static nir_constant *
 121 read_constant(read_ctx *ctx, nir_variable *nvar)
 122 {
 123    nir_constant *c = ralloc(nvar, nir_constant);
 124
 125    blob_copy_bytes(ctx->blob, (uint8_t *)c->values, sizeof(c->values));
 126    c->num_elements = blob_read_uint32(ctx->blob);
 127    c->elements = ralloc_array(ctx->nir, nir_constant *, c->num_elements);
 128    for (unsigned i = 0; i < c->num_elements; i++)
 129       c->elements[i] = read_constant(ctx, nvar);
 130
 131    return c;
 132 }
 133
 134 static void
 135 write_variable(write_ctx *ctx, const nir_variable *var)
 136 {
 137    write_add_object(ctx, var);
 138    encode_type_to_blob(ctx->blob, var->type);
 139    blob_write_uint32(ctx->blob, !!(var->name));
 140    if (var->name)
 141       blob_write_string(ctx->blob, var->name);
 142    blob_write_bytes(ctx->blob, (uint8_t *) &var->data, sizeof(var->data));
 143    blob_write_uint32(ctx->blob, var->num_state_slots);
 144    blob_write_bytes(ctx->blob, (uint8_t *) var->state_slots,
 145                     var->num_state_slots * sizeof(nir_state_slot));
 146    blob_write_uint32(ctx->blob, !!(var->constant_initializer));
 147    if (var->constant_initializer)
 148       write_constant(ctx, var->constant_initializer);
 149    blob_write_uint32(ctx->blob, !!(var->interface_type));
 150    if (var->interface_type)
 151       encode_type_to_blob(ctx->blob, var->interface_type);
 152    blob_write_uint32(ctx->blob, var->num_members);
 153    if (var->num_members > 0) {
 154       blob_write_bytes(ctx->blob, (uint8_t *) var->members,
 155                        var->num_members * sizeof(*var->members));
 156    }
 157 }
 158
 159 static nir_variable *
 160 read_variable(read_ctx *ctx)
 161 {
 162    nir_variable *var = rzalloc(ctx->nir, nir_variable);
 163    read_add_object(ctx, var);
 164
 165    var->type = decode_type_from_blob(ctx->blob);
 166    bool has_name = blob_read_uint32(ctx->blob);
 167    if (has_name) {
 168       const char *name = blob_read_string(ctx->blob);
 169       var->name = ralloc_strdup(var, name);
 170    } else {
 171       var->name = NULL;
 172    }
 173    blob_copy_bytes(ctx->blob, (uint8_t *) &var->data, sizeof(var->data));
 174    var->num_state_slots = blob_read_uint32(ctx->blob);
 175    var->state_slots = ralloc_array(var, nir_state_slot, var->num_state_slots);
 176    blob_copy_bytes(ctx->blob, (uint8_t *) var->state_slots,
 177                    var->num_state_slots * sizeof(nir_state_slot));
 178    bool has_const_initializer = blob_read_uint32(ctx->blob);
 179    if (has_const_initializer)
 180       var->constant_initializer = read_constant(ctx, var);
 181    else
 182       var->constant_initializer = NULL;
 183    bool has_interface_type = blob_read_uint32(ctx->blob);
 184    if (has_interface_type)
 185       var->interface_type = decode_type_from_blob(ctx->blob);
 186    else
 187       var->interface_type = NULL;
 188    var->num_members = blob_read_uint32(ctx->blob);
 189    if (var->num_members > 0) {
 190       var->members = ralloc_array(var, struct nir_variable_data,
 191                                   var->num_members);
 192       blob_copy_bytes(ctx->blob, (uint8_t *) var->members,
 193                       var->num_members * sizeof(*var->members));
 194    }
 195
 196    return var;
 197 }
 198
 199 static void
 200 write_var_list(write_ctx *ctx, const struct exec_list *src)
 201 {
 202    blob_write_uint32(ctx->blob, exec_list_length(src));
 203    foreach_list_typed(nir_variable, var, node, src) {
 204       write_variable(ctx, var);
 205    }
 206 }
 207
 208 static void
 209 read_var_list(read_ctx *ctx, struct exec_list *dst)
 210 {
 211    exec_list_make_empty(dst);
 212    unsigned num_vars = blob_read_uint32(ctx->blob);
 213    for (unsigned i = 0; i < num_vars; i++) {
 214       nir_variable *var = read_variable(ctx);
 215       exec_list_push_tail(dst, &var->node);
 216    }
 217 }
 218
 219 static void
 220 write_register(write_ctx *ctx, const nir_register *reg)
 221 {
 222    write_add_object(ctx, reg);
 223    blob_write_uint32(ctx->blob, reg->num_components);
 224    blob_write_uint32(ctx->blob, reg->bit_size);
 225    blob_write_uint32(ctx->blob, reg->num_array_elems);
 226    blob_write_uint32(ctx->blob, reg->index);
 227    blob_write_uint32(ctx->blob, !!(reg->name));
 228    if (reg->name)
 229       blob_write_string(ctx->blob, reg->name);
 230    blob_write_uint32(ctx->blob, reg->is_global << 1 | reg->is_packed);
 231 }
 232
 233 static nir_register *
 234 read_register(read_ctx *ctx)
 235 {
 236    nir_register *reg = ralloc(ctx->nir, nir_register);
 237    read_add_object(ctx, reg);
 238    reg->num_components = blob_read_uint32(ctx->blob);
 239    reg->bit_size = blob_read_uint32(ctx->blob);
 240    reg->num_array_elems = blob_read_uint32(ctx->blob);
 241    reg->index = blob_read_uint32(ctx->blob);
 242    bool has_name = blob_read_uint32(ctx->blob);
 243    if (has_name) {
 244       const char *name = blob_read_string(ctx->blob);
 245       reg->name = ralloc_strdup(reg, name);
 246    } else {
 247       reg->name = NULL;
 248    }
 249    unsigned flags = blob_read_uint32(ctx->blob);
 250    reg->is_global = flags & 0x2;
 251    reg->is_packed = flags & 0x1;
 252
 253    list_inithead(&reg->uses);
 254    list_inithead(&reg->defs);
 255    list_inithead(&reg->if_uses);
 256
 257    return reg;
 258 }
 259
 260 static void
 261 write_reg_list(write_ctx *ctx, const struct exec_list *src)
 262 {
 263    blob_write_uint32(ctx->blob, exec_list_length(src));
 264    foreach_list_typed(nir_register, reg, node, src)
 265       write_register(ctx, reg);
 266 }
 267
 268 static void
 269 read_reg_list(read_ctx *ctx, struct exec_list *dst)
 270 {
 271    exec_list_make_empty(dst);
 272    unsigned num_regs = blob_read_uint32(ctx->blob);
 273    for (unsigned i = 0; i < num_regs; i++) {
 274       nir_register *reg = read_register(ctx);
 275       exec_list_push_tail(dst, &reg->node);
 276    }
 277 }
 278
 279 static void
 280 write_src(write_ctx *ctx, const nir_src *src)
 281 {
 282    /* Since sources are very frequent, we try to save some space when storing
 283     * them. In particular, we store whether the source is a register and
 284     * whether the register has an indirect index in the low two bits. We can
 285     * assume that the high two bits of the index are zero, since otherwise our
 286     * address space would've been exhausted allocating the remap table!
 287     */
 288    if (src->is_ssa) {
 289       uintptr_t idx = write_lookup_object(ctx, src->ssa) << 2;
 290       idx |= 1;
 291       blob_write_intptr(ctx->blob, idx);
 292    } else {
 293       uintptr_t idx = write_lookup_object(ctx, src->reg.reg) << 2;
 294       if (src->reg.indirect)
 295          idx |= 2;
 296       blob_write_intptr(ctx->blob, idx);
 297       blob_write_uint32(ctx->blob, src->reg.base_offset);
 298       if (src->reg.indirect) {
 299          write_src(ctx, src->reg.indirect);
 300       }
 301    }
 302 }
 303
 304 static void
 305 read_src(read_ctx *ctx, nir_src *src, void *mem_ctx)
 306 {
 307    uintptr_t val = blob_read_intptr(ctx->blob);
 308    uintptr_t idx = val >> 2;
 309    src->is_ssa = val & 0x1;
 310    if (src->is_ssa) {
 311       src->ssa = read_lookup_object(ctx, idx);
 312    } else {
 313       bool is_indirect = val & 0x2;
 314       src->reg.reg = read_lookup_object(ctx, idx);
 315       src->reg.base_offset = blob_read_uint32(ctx->blob);
 316       if (is_indirect) {
 317          src->reg.indirect = ralloc(mem_ctx, nir_src);
 318          read_src(ctx, src->reg.indirect, mem_ctx);
 319       } else {
 320          src->reg.indirect = NULL;
 321       }
 322    }
 323 }
 324
 325 static void
 326 write_dest(write_ctx *ctx, const nir_dest *dst)
 327 {
 328    uint32_t val = dst->is_ssa;
 329    if (dst->is_ssa) {
 330       val |= !!(dst->ssa.name) << 1;
 331       val |= dst->ssa.num_components << 2;
 332       val |= dst->ssa.bit_size << 5;
 333    } else {
 334       val |= !!(dst->reg.indirect) << 1;
 335    }
 336    blob_write_uint32(ctx->blob, val);
 337    if (dst->is_ssa) {
 338       write_add_object(ctx, &dst->ssa);
 339       if (dst->ssa.name)
 340          blob_write_string(ctx->blob, dst->ssa.name);
 341    } else {
 342       blob_write_intptr(ctx->blob, write_lookup_object(ctx, dst->reg.reg));
 343       blob_write_uint32(ctx->blob, dst->reg.base_offset);
 344       if (dst->reg.indirect)
 345          write_src(ctx, dst->reg.indirect);
 346    }
 347 }
 348
 349 static void
 350 read_dest(read_ctx *ctx, nir_dest *dst, nir_instr *instr)
 351 {
 352    uint32_t val = blob_read_uint32(ctx->blob);
 353    bool is_ssa = val & 0x1;
 354    if (is_ssa) {
 355       bool has_name = val & 0x2;
 356       unsigned num_components = (val >> 2) & 0x7;
 357       unsigned bit_size = val >> 5;
 358       char *name = has_name ? blob_read_string(ctx->blob) : NULL;
 359       nir_ssa_dest_init(instr, dst, num_components, bit_size, name);
 360       read_add_object(ctx, &dst->ssa);
 361    } else {
 362       bool is_indirect = val & 0x2;
 363       dst->reg.reg = read_object(ctx);
 364       dst->reg.base_offset = blob_read_uint32(ctx->blob);
 365       if (is_indirect) {
 366          dst->reg.indirect = ralloc(instr, nir_src);
 367          read_src(ctx, dst->reg.indirect, instr);
 368       }
 369    }
 370 }
 371
 372 static void
 373 write_deref_chain(write_ctx *ctx, const nir_deref_var *deref_var)
 374 {
 375    write_object(ctx, deref_var->var);
 376
 377    uint32_t len = 0;
 378    for (const nir_deref *d = deref_var->deref.child; d; d = d->child)
 379       len++;
 380    blob_write_uint32(ctx->blob, len);
 381
 382    for (const nir_deref *d = deref_var->deref.child; d; d = d->child) {
 383       blob_write_uint32(ctx->blob, d->deref_type);
 384       switch (d->deref_type) {
 385       case nir_deref_type_array: {
 386          const nir_deref_array *deref_array = nir_deref_as_array(d);
 387          blob_write_uint32(ctx->blob, deref_array->deref_array_type);
 388          blob_write_uint32(ctx->blob, deref_array->base_offset);
 389          if (deref_array->deref_array_type == nir_deref_array_type_indirect)
 390             write_src(ctx, &deref_array->indirect);
 391          break;
 392       }
 393       case nir_deref_type_struct: {
 394          const nir_deref_struct *deref_struct = nir_deref_as_struct(d);
 395          blob_write_uint32(ctx->blob, deref_struct->index);
 396          break;
 397       }
 398       case nir_deref_type_var:
 399          unreachable("Invalid deref type");
 400       }
 401
 402       encode_type_to_blob(ctx->blob, d->type);
 403    }
 404 }
 405
 406 static nir_deref_var *
 407 read_deref_chain(read_ctx *ctx, void *mem_ctx)
 408 {
 409    nir_variable *var = read_object(ctx);
 410    nir_deref_var *deref_var = nir_deref_var_create(mem_ctx, var);
 411
 412    uint32_t len = blob_read_uint32(ctx->blob);
 413
 414    nir_deref *tail = &deref_var->deref;
 415    for (uint32_t i = 0; i < len; i++) {
 416       nir_deref_type deref_type = blob_read_uint32(ctx->blob);
 417       nir_deref *deref = NULL;
 418       switch (deref_type) {
 419       case nir_deref_type_array: {
 420          nir_deref_array *deref_array = nir_deref_array_create(tail);
 421          deref_array->deref_array_type = blob_read_uint32(ctx->blob);
 422          deref_array->base_offset = blob_read_uint32(ctx->blob);
 423          if (deref_array->deref_array_type == nir_deref_array_type_indirect)
 424             read_src(ctx, &deref_array->indirect, mem_ctx);
 425          deref = &deref_array->deref;
 426          break;
 427       }
 428       case nir_deref_type_struct: {
 429          uint32_t index = blob_read_uint32(ctx->blob);
 430          nir_deref_struct *deref_struct = nir_deref_struct_create(tail, index);
 431          deref = &deref_struct->deref;
 432          break;
 433       }
 434       case nir_deref_type_var:
 435          unreachable("Invalid deref type");
 436       }
 437
 438       deref->type = decode_type_from_blob(ctx->blob);
 439
 440       tail->child = deref;
 441       tail = deref;
 442    }
 443
 444    return deref_var;
 445 }
 446
 447 static void
 448 write_alu(write_ctx *ctx, const nir_alu_instr *alu)
 449 {
 450    blob_write_uint32(ctx->blob, alu->op);
 451    uint32_t flags = alu->exact;
 452    flags |= alu->dest.saturate << 1;
 453    flags |= alu->dest.write_mask << 2;
 454    blob_write_uint32(ctx->blob, flags);
 455
 456    write_dest(ctx, &alu->dest.dest);
 457
 458    for (unsigned i = 0; i < nir_op_infos[alu->op].num_inputs; i++) {
 459       write_src(ctx, &alu->src[i].src);
 460       flags = alu->src[i].negate;
 461       flags |= alu->src[i].abs << 1;
 462       for (unsigned j = 0; j < 4; j++)
 463          flags |= alu->src[i].swizzle[j] << (2 + 2 * j);
 464       blob_write_uint32(ctx->blob, flags);
 465    }
 466 }
 467
 468 static nir_alu_instr *
 469 read_alu(read_ctx *ctx)
 470 {
 471    nir_op op = blob_read_uint32(ctx->blob);
 472    nir_alu_instr *alu = nir_alu_instr_create(ctx->nir, op);
 473
 474    uint32_t flags = blob_read_uint32(ctx->blob);
 475    alu->exact = flags & 1;
 476    alu->dest.saturate = flags & 2;
 477    alu->dest.write_mask = flags >> 2;
 478
 479    read_dest(ctx, &alu->dest.dest, &alu->instr);
 480
 481    for (unsigned i = 0; i < nir_op_infos[op].num_inputs; i++) {
 482       read_src(ctx, &alu->src[i].src, &alu->instr);
 483       flags = blob_read_uint32(ctx->blob);
 484       alu->src[i].negate = flags & 1;
 485       alu->src[i].abs = flags & 2;
 486       for (unsigned j = 0; j < 4; j++)
 487          alu->src[i].swizzle[j] = (flags >> (2 * j + 2)) & 3;
 488    }
 489
 490    return alu;
 491 }
 492
 493 static void
 494 write_deref(write_ctx *ctx, const nir_deref_instr *deref)
 495 {
 496    blob_write_uint32(ctx->blob, deref->deref_type);
 497
 498    blob_write_uint32(ctx->blob, deref->mode);
 499    encode_type_to_blob(ctx->blob, deref->type);
 500
 501    write_dest(ctx, &deref->dest);
 502
 503    if (deref->deref_type == nir_deref_type_var) {
 504       write_object(ctx, deref->var);
 505       return;
 506    }
 507
 508    write_src(ctx, &deref->parent);
 509
 510    switch (deref->deref_type) {
 511    case nir_deref_type_struct:
 512       blob_write_uint32(ctx->blob, deref->strct.index);
 513       break;
 514
 515    case nir_deref_type_array:
 516       write_src(ctx, &deref->arr.index);
 517       break;
 518
 519    case nir_deref_type_array_wildcard:
 520    case nir_deref_type_cast:
 521       /* Nothing to do */
 522       break;
 523
 524    default:
 525       unreachable("Invalid deref type");
 526    }
 527 }
 528
 529 static nir_deref_instr *
 530 read_deref(read_ctx *ctx)
 531 {
 532    nir_deref_type deref_type = blob_read_uint32(ctx->blob);
 533    nir_deref_instr *deref = nir_deref_instr_create(ctx->nir, deref_type);
 534
 535    deref->mode = blob_read_uint32(ctx->blob);
 536    deref->type = decode_type_from_blob(ctx->blob);
 537
 538    read_dest(ctx, &deref->dest, &deref->instr);
 539
 540    if (deref_type == nir_deref_type_var) {
 541       deref->var = read_object(ctx);
 542       return deref;
 543    }
 544
 545    read_src(ctx, &deref->parent, &deref->instr);
 546
 547    switch (deref->deref_type) {
 548    case nir_deref_type_struct:
 549       deref->strct.index = blob_read_uint32(ctx->blob);
 550       break;
 551
 552    case nir_deref_type_array:
 553       read_src(ctx, &deref->arr.index, &deref->instr);
 554       break;
 555
 556    case nir_deref_type_array_wildcard:
 557    case nir_deref_type_cast:
 558       /* Nothing to do */
 559       break;
 560
 561    default:
 562       unreachable("Invalid deref type");
 563    }
 564
 565    return deref;
 566 }
 567
 568 static void
 569 write_intrinsic(write_ctx *ctx, const nir_intrinsic_instr *intrin)
 570 {
 571    blob_write_uint32(ctx->blob, intrin->intrinsic);
 572
 573    unsigned num_variables = nir_intrinsic_infos[intrin->intrinsic].num_variables;
 574    unsigned num_srcs = nir_intrinsic_infos[intrin->intrinsic].num_srcs;
 575    unsigned num_indices = nir_intrinsic_infos[intrin->intrinsic].num_indices;
 576
 577    blob_write_uint32(ctx->blob, intrin->num_components);
 578
 579    if (nir_intrinsic_infos[intrin->intrinsic].has_dest)
 580       write_dest(ctx, &intrin->dest);
 581
 582    for (unsigned i = 0; i < num_variables; i++)
 583       write_deref_chain(ctx, intrin->variables[i]);
 584
 585    for (unsigned i = 0; i < num_srcs; i++)
 586       write_src(ctx, &intrin->src[i]);
 587
 588    for (unsigned i = 0; i < num_indices; i++)
 589       blob_write_uint32(ctx->blob, intrin->const_index[i]);
 590 }
 591
 592 static nir_intrinsic_instr *
 593 read_intrinsic(read_ctx *ctx)
 594 {
 595    nir_intrinsic_op op = blob_read_uint32(ctx->blob);
 596
 597    nir_intrinsic_instr *intrin = nir_intrinsic_instr_create(ctx->nir, op);
 598
 599    unsigned num_variables = nir_intrinsic_infos[op].num_variables;
 600    unsigned num_srcs = nir_intrinsic_infos[op].num_srcs;
 601    unsigned num_indices = nir_intrinsic_infos[op].num_indices;
 602
 603    intrin->num_components = blob_read_uint32(ctx->blob);
 604
 605    if (nir_intrinsic_infos[op].has_dest)
 606       read_dest(ctx, &intrin->dest, &intrin->instr);
 607
 608    for (unsigned i = 0; i < num_variables; i++)
 609       intrin->variables[i] = read_deref_chain(ctx, &intrin->instr);
 610
 611    for (unsigned i = 0; i < num_srcs; i++)
 612       read_src(ctx, &intrin->src[i], &intrin->instr);
 613
 614    for (unsigned i = 0; i < num_indices; i++)
 615       intrin->const_index[i] = blob_read_uint32(ctx->blob);
 616
 617    return intrin;
 618 }
 619
 620 static void
 621 write_load_const(write_ctx *ctx, const nir_load_const_instr *lc)
 622 {
 623    uint32_t val = lc->def.num_components;
 624    val |= lc->def.bit_size << 3;
 625    blob_write_uint32(ctx->blob, val);
 626    blob_write_bytes(ctx->blob, (uint8_t *) &lc->value, sizeof(lc->value));
 627    write_add_object(ctx, &lc->def);
 628 }
 629
 630 static nir_load_const_instr *
 631 read_load_const(read_ctx *ctx)
 632 {
 633    uint32_t val = blob_read_uint32(ctx->blob);
 634
 635    nir_load_const_instr *lc =
 636       nir_load_const_instr_create(ctx->nir, val & 0x7, val >> 3);
 637
 638    blob_copy_bytes(ctx->blob, (uint8_t *) &lc->value, sizeof(lc->value));
 639    read_add_object(ctx, &lc->def);
 640    return lc;
 641 }
 642
 643 static void
 644 write_ssa_undef(write_ctx *ctx, const nir_ssa_undef_instr *undef)
 645 {
 646    uint32_t val = undef->def.num_components;
 647    val |= undef->def.bit_size << 3;
 648    blob_write_uint32(ctx->blob, val);
 649    write_add_object(ctx, &undef->def);
 650 }
 651
 652 static nir_ssa_undef_instr *
 653 read_ssa_undef(read_ctx *ctx)
 654 {
 655    uint32_t val = blob_read_uint32(ctx->blob);
 656
 657    nir_ssa_undef_instr *undef =
 658       nir_ssa_undef_instr_create(ctx->nir, val & 0x7, val >> 3);
 659
 660    read_add_object(ctx, &undef->def);
 661    return undef;
 662 }
 663
 664 union packed_tex_data {
 665    uint32_t u32;
 666    struct {
 667       enum glsl_sampler_dim sampler_dim:4;
 668       nir_alu_type dest_type:8;
 669       unsigned coord_components:3;
 670       unsigned is_array:1;
 671       unsigned is_shadow:1;
 672       unsigned is_new_style_shadow:1;
 673       unsigned component:2;
 674       unsigned has_texture_deref:1;
 675       unsigned has_sampler_deref:1;
 676       unsigned unused:10; /* Mark unused for valgrind. */
 677    } u;
 678 };
 679
 680 static void
 681 write_tex(write_ctx *ctx, const nir_tex_instr *tex)
 682 {
 683    blob_write_uint32(ctx->blob, tex->num_srcs);
 684    blob_write_uint32(ctx->blob, tex->op);
 685    blob_write_uint32(ctx->blob, tex->texture_index);
 686    blob_write_uint32(ctx->blob, tex->texture_array_size);
 687    blob_write_uint32(ctx->blob, tex->sampler_index);
 688
 689    STATIC_ASSERT(sizeof(union packed_tex_data) == sizeof(uint32_t));
 690    union packed_tex_data packed = {
 691       .u.sampler_dim = tex->sampler_dim,
 692       .u.dest_type = tex->dest_type,
 693       .u.coord_components = tex->coord_components,
 694       .u.is_array = tex->is_array,
 695       .u.is_shadow = tex->is_shadow,
 696       .u.is_new_style_shadow = tex->is_new_style_shadow,
 697       .u.component = tex->component,
 698       .u.has_texture_deref = tex->texture != NULL,
 699       .u.has_sampler_deref = tex->sampler != NULL,
 700    };
 701    blob_write_uint32(ctx->blob, packed.u32);
 702
 703    write_dest(ctx, &tex->dest);
 704    for (unsigned i = 0; i < tex->num_srcs; i++) {
 705       blob_write_uint32(ctx->blob, tex->src[i].src_type);
 706       write_src(ctx, &tex->src[i].src);
 707    }
 708
 709    if (tex->texture)
 710       write_deref_chain(ctx, tex->texture);
 711    if (tex->sampler)
 712       write_deref_chain(ctx, tex->sampler);
 713 }
 714
 715 static nir_tex_instr *
 716 read_tex(read_ctx *ctx)
 717 {
 718    unsigned num_srcs = blob_read_uint32(ctx->blob);
 719    nir_tex_instr *tex = nir_tex_instr_create(ctx->nir, num_srcs);
 720
 721    tex->op = blob_read_uint32(ctx->blob);
 722    tex->texture_index = blob_read_uint32(ctx->blob);
 723    tex->texture_array_size = blob_read_uint32(ctx->blob);
 724    tex->sampler_index = blob_read_uint32(ctx->blob);
 725
 726    union packed_tex_data packed;
 727    packed.u32 = blob_read_uint32(ctx->blob);
 728    tex->sampler_dim = packed.u.sampler_dim;
 729    tex->dest_type = packed.u.dest_type;
 730    tex->coord_components = packed.u.coord_components;
 731    tex->is_array = packed.u.is_array;
 732    tex->is_shadow = packed.u.is_shadow;
 733    tex->is_new_style_shadow = packed.u.is_new_style_shadow;
 734    tex->component = packed.u.component;
 735
 736    read_dest(ctx, &tex->dest, &tex->instr);
 737    for (unsigned i = 0; i < tex->num_srcs; i++) {
 738       tex->src[i].src_type = blob_read_uint32(ctx->blob);
 739       read_src(ctx, &tex->src[i].src, &tex->instr);
 740    }
 741
 742    tex->texture = packed.u.has_texture_deref ?
 743                   read_deref_chain(ctx, &tex->instr) : NULL;
 744    tex->sampler = packed.u.has_sampler_deref ?
 745                   read_deref_chain(ctx, &tex->instr) : NULL;
 746
 747    return tex;
 748 }
 749
 750 static void
 751 write_phi(write_ctx *ctx, const nir_phi_instr *phi)
 752 {
 753    /* Phi nodes are special, since they may reference SSA definitions and
 754     * basic blocks that don't exist yet. We leave two empty uintptr_t's here,
 755     * and then store enough information so that a later fixup pass can fill
 756     * them in correctly.
 757     */
 758    write_dest(ctx, &phi->dest);
 759
 760    blob_write_uint32(ctx->blob, exec_list_length(&phi->srcs));
 761
 762    nir_foreach_phi_src(src, phi) {
 763       assert(src->src.is_ssa);
 764       size_t blob_offset = blob_reserve_intptr(ctx->blob);
 765       MAYBE_UNUSED size_t blob_offset2 = blob_reserve_intptr(ctx->blob);
 766       assert(blob_offset + sizeof(uintptr_t) == blob_offset2);
 767       write_phi_fixup fixup = {
 768          .blob_offset = blob_offset,
 769          .src = src->src.ssa,
 770          .block = src->pred,
 771       };
 772       util_dynarray_append(&ctx->phi_fixups, write_phi_fixup, fixup);
 773    }
 774 }
 775
 776 static void
 777 write_fixup_phis(write_ctx *ctx)
 778 {
 779    util_dynarray_foreach(&ctx->phi_fixups, write_phi_fixup, fixup) {
 780       uintptr_t *blob_ptr = (uintptr_t *)(ctx->blob->data + fixup->blob_offset);
 781       blob_ptr[0] = write_lookup_object(ctx, fixup->src);
 782       blob_ptr[1] = write_lookup_object(ctx, fixup->block);
 783    }
 784
 785    util_dynarray_clear(&ctx->phi_fixups);
 786 }
 787
 788 static nir_phi_instr *
 789 read_phi(read_ctx *ctx, nir_block *blk)
 790 {
 791    nir_phi_instr *phi = nir_phi_instr_create(ctx->nir);
 792
 793    read_dest(ctx, &phi->dest, &phi->instr);
 794
 795    unsigned num_srcs = blob_read_uint32(ctx->blob);
 796
 797    /* For similar reasons as before, we just store the index directly into the
 798     * pointer, and let a later pass resolve the phi sources.
 799     *
 800     * In order to ensure that the copied sources (which are just the indices
 801     * from the blob for now) don't get inserted into the old shader's use-def
 802     * lists, we have to add the phi instruction *before* we set up its
 803     * sources.
 804     */
 805    nir_instr_insert_after_block(blk, &phi->instr);
 806
 807    for (unsigned i = 0; i < num_srcs; i++) {
 808       nir_phi_src *src = ralloc(phi, nir_phi_src);
 809
 810       src->src.is_ssa = true;
 811       src->src.ssa = (nir_ssa_def *) blob_read_intptr(ctx->blob);
 812       src->pred = (nir_block *) blob_read_intptr(ctx->blob);
 813
 814       /* Since we're not letting nir_insert_instr handle use/def stuff for us,
 815        * we have to set the parent_instr manually.  It doesn't really matter
 816        * when we do it, so we might as well do it here.
 817        */
 818       src->src.parent_instr = &phi->instr;
 819
 820       /* Stash it in the list of phi sources.  We'll walk this list and fix up
 821        * sources at the very end of read_function_impl.
 822        */
 823       list_add(&src->src.use_link, &ctx->phi_srcs);
 824
 825       exec_list_push_tail(&phi->srcs, &src->node);
 826    }
 827
 828    return phi;
 829 }
 830
 831 static void
 832 read_fixup_phis(read_ctx *ctx)
 833 {
 834    list_for_each_entry_safe(nir_phi_src, src, &ctx->phi_srcs, src.use_link) {
 835       src->pred = read_lookup_object(ctx, (uintptr_t)src->pred);
 836       src->src.ssa = read_lookup_object(ctx, (uintptr_t)src->src.ssa);
 837
 838       /* Remove from this list */
 839       list_del(&src->src.use_link);
 840
 841       list_addtail(&src->src.use_link, &src->src.ssa->uses);
 842    }
 843    assert(list_empty(&ctx->phi_srcs));
 844 }
 845
 846 static void
 847 write_jump(write_ctx *ctx, const nir_jump_instr *jmp)
 848 {
 849    blob_write_uint32(ctx->blob, jmp->type);
 850 }
 851
 852 static nir_jump_instr *
 853 read_jump(read_ctx *ctx)
 854 {
 855    nir_jump_type type = blob_read_uint32(ctx->blob);
 856    nir_jump_instr *jmp = nir_jump_instr_create(ctx->nir, type);
 857    return jmp;
 858 }
 859
 860 static void
 861 write_call(write_ctx *ctx, const nir_call_instr *call)
 862 {
 863    blob_write_intptr(ctx->blob, write_lookup_object(ctx, call->callee));
 864
 865    for (unsigned i = 0; i < call->num_params; i++)
 866       write_src(ctx, &call->params[i]);
 867 }
 868
 869 static nir_call_instr *
 870 read_call(read_ctx *ctx)
 871 {
 872    nir_function *callee = read_object(ctx);
 873    nir_call_instr *call = nir_call_instr_create(ctx->nir, callee);
 874
 875    for (unsigned i = 0; i < call->num_params; i++)
 876       read_src(ctx, &call->params[i], call);
 877
 878    return call;
 879 }
 880
 881 static void
 882 write_instr(write_ctx *ctx, const nir_instr *instr)
 883 {
 884    blob_write_uint32(ctx->blob, instr->type);
 885    switch (instr->type) {
 886    case nir_instr_type_alu:
 887       write_alu(ctx, nir_instr_as_alu(instr));
 888       break;
 889    case nir_instr_type_deref:
 890       write_deref(ctx, nir_instr_as_deref(instr));
 891       break;
 892    case nir_instr_type_intrinsic:
 893       write_intrinsic(ctx, nir_instr_as_intrinsic(instr));
 894       break;
 895    case nir_instr_type_load_const:
 896       write_load_const(ctx, nir_instr_as_load_const(instr));
 897       break;
 898    case nir_instr_type_ssa_undef:
 899       write_ssa_undef(ctx, nir_instr_as_ssa_undef(instr));
 900       break;
 901    case nir_instr_type_tex:
 902       write_tex(ctx, nir_instr_as_tex(instr));
 903       break;
 904    case nir_instr_type_phi:
 905       write_phi(ctx, nir_instr_as_phi(instr));
 906       break;
 907    case nir_instr_type_jump:
 908       write_jump(ctx, nir_instr_as_jump(instr));
 909       break;
 910    case nir_instr_type_call:
 911       write_call(ctx, nir_instr_as_call(instr));
 912       break;
 913    case nir_instr_type_parallel_copy:
 914       unreachable("Cannot write parallel copies");
 915    default:
 916       unreachable("bad instr type");
 917    }
 918 }
 919
 920 static void
 921 read_instr(read_ctx *ctx, nir_block *block)
 922 {
 923    nir_instr_type type = blob_read_uint32(ctx->blob);
 924    nir_instr *instr;
 925    switch (type) {
 926    case nir_instr_type_alu:
 927       instr = &read_alu(ctx)->instr;
 928       break;
 929    case nir_instr_type_deref:
 930       instr = &read_deref(ctx)->instr;
 931       break;
 932    case nir_instr_type_intrinsic:
 933       instr = &read_intrinsic(ctx)->instr;
 934       break;
 935    case nir_instr_type_load_const:
 936       instr = &read_load_const(ctx)->instr;
 937       break;
 938    case nir_instr_type_ssa_undef:
 939       instr = &read_ssa_undef(ctx)->instr;
 940       break;
 941    case nir_instr_type_tex:
 942       instr = &read_tex(ctx)->instr;
 943       break;
 944    case nir_instr_type_phi:
 945       /* Phi instructions are a bit of a special case when reading because we
 946        * don't want inserting the instruction to automatically handle use/defs
 947        * for us.  Instead, we need to wait until all the blocks/instructions
 948        * are read so that we can set their sources up.
 949        */
 950       read_phi(ctx, block);
 951       return;
 952    case nir_instr_type_jump:
 953       instr = &read_jump(ctx)->instr;
 954       break;
 955    case nir_instr_type_call:
 956       instr = &read_call(ctx)->instr;
 957       break;
 958    case nir_instr_type_parallel_copy:
 959       unreachable("Cannot read parallel copies");
 960    default:
 961       unreachable("bad instr type");
 962    }
 963
 964    nir_instr_insert_after_block(block, instr);
 965 }
 966
 967 static void
 968 write_block(write_ctx *ctx, const nir_block *block)
 969 {
 970    write_add_object(ctx, block);
 971    blob_write_uint32(ctx->blob, exec_list_length(&block->instr_list));
 972    nir_foreach_instr(instr, block)
 973       write_instr(ctx, instr);
 974 }
 975
 976 static void
 977 read_block(read_ctx *ctx, struct exec_list *cf_list)
 978 {
 979    /* Don't actually create a new block.  Just use the one from the tail of
 980     * the list.  NIR guarantees that the tail of the list is a block and that
 981     * no two blocks are side-by-side in the IR;  It should be empty.
 982     */
 983    nir_block *block =
 984       exec_node_data(nir_block, exec_list_get_tail(cf_list), cf_node.node);
 985
 986    read_add_object(ctx, block);
 987    unsigned num_instrs = blob_read_uint32(ctx->blob);
 988    for (unsigned i = 0; i < num_instrs; i++) {
 989       read_instr(ctx, block);
 990    }
 991 }
 992
 993 static void
 994 write_cf_list(write_ctx *ctx, const struct exec_list *cf_list);
 995
 996 static void
 997 read_cf_list(read_ctx *ctx, struct exec_list *cf_list);
 998
 999 static void
1000 write_if(write_ctx *ctx, nir_if *nif)
1001 {
1002    write_src(ctx, &nif->condition);
1003
1004    write_cf_list(ctx, &nif->then_list);
1005    write_cf_list(ctx, &nif->else_list);
1006 }
1007
1008 static void
1009 read_if(read_ctx *ctx, struct exec_list *cf_list)
1010 {
1011    nir_if *nif = nir_if_create(ctx->nir);
1012
1013    read_src(ctx, &nif->condition, nif);
1014
1015    nir_cf_node_insert_end(cf_list, &nif->cf_node);
1016
1017    read_cf_list(ctx, &nif->then_list);
1018    read_cf_list(ctx, &nif->else_list);
1019 }
1020
1021 static void
1022 write_loop(write_ctx *ctx, nir_loop *loop)
1023 {
1024    write_cf_list(ctx, &loop->body);
1025 }
1026
1027 static void
1028 read_loop(read_ctx *ctx, struct exec_list *cf_list)
1029 {
1030    nir_loop *loop = nir_loop_create(ctx->nir);
1031
1032    nir_cf_node_insert_end(cf_list, &loop->cf_node);
1033
1034    read_cf_list(ctx, &loop->body);
1035 }
1036
1037 static void
1038 write_cf_node(write_ctx *ctx, nir_cf_node *cf)
1039 {
1040    blob_write_uint32(ctx->blob, cf->type);
1041
1042    switch (cf->type) {
1043    case nir_cf_node_block:
1044       write_block(ctx, nir_cf_node_as_block(cf));
1045       break;
1046    case nir_cf_node_if:
1047       write_if(ctx, nir_cf_node_as_if(cf));
1048       break;
1049    case nir_cf_node_loop:
1050       write_loop(ctx, nir_cf_node_as_loop(cf));
1051       break;
1052    default:
1053       unreachable("bad cf type");
1054    }
1055 }
1056
1057 static void
1058 read_cf_node(read_ctx *ctx, struct exec_list *list)
1059 {
1060    nir_cf_node_type type = blob_read_uint32(ctx->blob);
1061
1062    switch (type) {
1063    case nir_cf_node_block:
1064       read_block(ctx, list);
1065       break;
1066    case nir_cf_node_if:
1067       read_if(ctx, list);
1068       break;
1069    case nir_cf_node_loop:
1070       read_loop(ctx, list);
1071       break;
1072    default:
1073       unreachable("bad cf type");
1074    }
1075 }
1076
1077 static void
1078 write_cf_list(write_ctx *ctx, const struct exec_list *cf_list)
1079 {
1080    blob_write_uint32(ctx->blob, exec_list_length(cf_list));
1081    foreach_list_typed(nir_cf_node, cf, node, cf_list) {
1082       write_cf_node(ctx, cf);
1083    }
1084 }
1085
1086 static void
1087 read_cf_list(read_ctx *ctx, struct exec_list *cf_list)
1088 {
1089    uint32_t num_cf_nodes = blob_read_uint32(ctx->blob);
1090    for (unsigned i = 0; i < num_cf_nodes; i++)
1091       read_cf_node(ctx, cf_list);
1092 }
1093
1094 static void
1095 write_function_impl(write_ctx *ctx, const nir_function_impl *fi)
1096 {
1097    write_var_list(ctx, &fi->locals);
1098    write_reg_list(ctx, &fi->registers);
1099    blob_write_uint32(ctx->blob, fi->reg_alloc);
1100
1101    write_cf_list(ctx, &fi->body);
1102    write_fixup_phis(ctx);
1103 }
1104
1105 static nir_function_impl *
1106 read_function_impl(read_ctx *ctx, nir_function *fxn)
1107 {
1108    nir_function_impl *fi = nir_function_impl_create_bare(ctx->nir);
1109    fi->function = fxn;
1110
1111    read_var_list(ctx, &fi->locals);
1112    read_reg_list(ctx, &fi->registers);
1113    fi->reg_alloc = blob_read_uint32(ctx->blob);
1114
1115    read_cf_list(ctx, &fi->body);
1116    read_fixup_phis(ctx);
1117
1118    fi->valid_metadata = 0;
1119
1120    return fi;
1121 }
1122
1123 static void
1124 write_function(write_ctx *ctx, const nir_function *fxn)
1125 {
1126    blob_write_uint32(ctx->blob, !!(fxn->name));
1127    if (fxn->name)
1128       blob_write_string(ctx->blob, fxn->name);
1129
1130    write_add_object(ctx, fxn);
1131
1132    blob_write_uint32(ctx->blob, fxn->num_params);
1133    for (unsigned i = 0; i < fxn->num_params; i++) {
1134       uint32_t val =
1135          ((uint32_t)fxn->params[i].num_components) |
1136          ((uint32_t)fxn->params[i].bit_size) << 8;
1137       blob_write_uint32(ctx->blob, val);
1138    }
1139
1140    /* At first glance, it looks like we should write the function_impl here.
1141     * However, call instructions need to be able to reference at least the
1142     * function and those will get processed as we write the function_impls.
1143     * We stop here and write function_impls as a second pass.
1144     */
1145 }
1146
1147 static void
1148 read_function(read_ctx *ctx)
1149 {
1150    bool has_name = blob_read_uint32(ctx->blob);
1151    char *name = has_name ? blob_read_string(ctx->blob) : NULL;
1152
1153    nir_function *fxn = nir_function_create(ctx->nir, name);
1154
1155    read_add_object(ctx, fxn);
1156
1157    fxn->num_params = blob_read_uint32(ctx->blob);
1158    fxn->params = ralloc_array(fxn, nir_parameter, fxn->num_params);
1159    for (unsigned i = 0; i < fxn->num_params; i++) {
1160       uint32_t val = blob_read_uint32(ctx->blob);
1161       fxn->params[i].num_components = val & 0xff;
1162       fxn->params[i].bit_size = (val >> 8) & 0xff;
1163    }
1164 }
1165
1166 void
1167 nir_serialize(struct blob *blob, const nir_shader *nir)
1168 {
1169    write_ctx ctx;
1170    ctx.remap_table = _mesa_hash_table_create(NULL, _mesa_hash_pointer,
1171                                              _mesa_key_pointer_equal);
1172    ctx.next_idx = 0;
1173    ctx.blob = blob;
1174    ctx.nir = nir;
1175    util_dynarray_init(&ctx.phi_fixups, NULL);
1176
1177    size_t idx_size_offset = blob_reserve_intptr(blob);
1178
1179    struct shader_info info = nir->info;
1180    uint32_t strings = 0;
1181    if (info.name)
1182       strings |= 0x1;
1183    if (info.label)
1184       strings |= 0x2;
1185    blob_write_uint32(blob, strings);
1186    if (info.name)
1187       blob_write_string(blob, info.name);
1188    if (info.label)
1189       blob_write_string(blob, info.label);
1190    info.name = info.label = NULL;
1191    blob_write_bytes(blob, (uint8_t *) &info, sizeof(info));
1192
1193    write_var_list(&ctx, &nir->uniforms);
1194    write_var_list(&ctx, &nir->inputs);
1195    write_var_list(&ctx, &nir->outputs);
1196    write_var_list(&ctx, &nir->shared);
1197    write_var_list(&ctx, &nir->globals);
1198    write_var_list(&ctx, &nir->system_values);
1199
1200    write_reg_list(&ctx, &nir->registers);
1201    blob_write_uint32(blob, nir->reg_alloc);
1202    blob_write_uint32(blob, nir->num_inputs);
1203    blob_write_uint32(blob, nir->num_uniforms);
1204    blob_write_uint32(blob, nir->num_outputs);
1205    blob_write_uint32(blob, nir->num_shared);
1206    blob_write_uint32(blob, nir->lowered_derefs);
1207
1208    blob_write_uint32(blob, exec_list_length(&nir->functions));
1209    nir_foreach_function(fxn, nir) {
1210       write_function(&ctx, fxn);
1211    }
1212
1213    nir_foreach_function(fxn, nir) {
1214       write_function_impl(&ctx, fxn->impl);
1215    }
1216
1217    *(uintptr_t *)(blob->data + idx_size_offset) = ctx.next_idx;
1218
1219    _mesa_hash_table_destroy(ctx.remap_table, NULL);
1220    util_dynarray_fini(&ctx.phi_fixups);
1221 }
1222
1223 nir_shader *
1224 nir_deserialize(void *mem_ctx,
1225                 const struct nir_shader_compiler_options *options,
1226                 struct blob_reader *blob)
1227 {
1228    read_ctx ctx;
1229    ctx.blob = blob;
1230    list_inithead(&ctx.phi_srcs);
1231    ctx.idx_table_len = blob_read_intptr(blob);
1232    ctx.idx_table = calloc(ctx.idx_table_len, sizeof(uintptr_t));
1233    ctx.next_idx = 0;
1234
1235    uint32_t strings = blob_read_uint32(blob);
1236    char *name = (strings & 0x1) ? blob_read_string(blob) : NULL;
1237    char *label = (strings & 0x2) ? blob_read_string(blob) : NULL;
1238
1239    struct shader_info info;
1240    blob_copy_bytes(blob, (uint8_t *) &info, sizeof(info));
1241
1242    ctx.nir = nir_shader_create(mem_ctx, info.stage, options, NULL);
1243
1244    info.name = name ? ralloc_strdup(ctx.nir, name) : NULL;
1245    info.label = label ? ralloc_strdup(ctx.nir, label) : NULL;
1246
1247    ctx.nir->info = info;
1248
1249    read_var_list(&ctx, &ctx.nir->uniforms);
1250    read_var_list(&ctx, &ctx.nir->inputs);
1251    read_var_list(&ctx, &ctx.nir->outputs);
1252    read_var_list(&ctx, &ctx.nir->shared);
1253    read_var_list(&ctx, &ctx.nir->globals);
1254    read_var_list(&ctx, &ctx.nir->system_values);
1255
1256    read_reg_list(&ctx, &ctx.nir->registers);
1257    ctx.nir->reg_alloc = blob_read_uint32(blob);
1258    ctx.nir->num_inputs = blob_read_uint32(blob);
1259    ctx.nir->num_uniforms = blob_read_uint32(blob);
1260    ctx.nir->num_outputs = blob_read_uint32(blob);
1261    ctx.nir->num_shared = blob_read_uint32(blob);
1262    ctx.nir->lowered_derefs = blob_read_uint32(blob);
1263
1264    unsigned num_functions = blob_read_uint32(blob);
1265    for (unsigned i = 0; i < num_functions; i++)
1266       read_function(&ctx);
1267
1268    nir_foreach_function(fxn, ctx.nir)
1269       fxn->impl = read_function_impl(&ctx, fxn);
1270
1271    free(ctx.idx_table);
1272
1273    return ctx.nir;
1274 }
1275
1276 nir_shader *
1277 nir_shader_serialize_deserialize(void *mem_ctx, nir_shader *s)
1278 {
1279    const struct nir_shader_compiler_options *options = s->options;
1280
1281    struct blob writer;
1282    blob_init(&writer);
1283    nir_serialize(&writer, s);
1284    ralloc_free(s);
1285
1286    struct blob_reader reader;
1287    blob_reader_init(&reader, writer.data, writer.size);
1288    nir_shader *ns = nir_deserialize(mem_ctx, options, &reader);
1289
1290    blob_finish(&writer);
1291
1292    return ns;
1293 }