src/gallium/auxiliary/tgsi/tgsi_dump.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007-2008 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "util/u_debug.h"
  29 #include "util/u_string.h"
  30 #include "util/u_math.h"
  31 #include "util/u_memory.h"
  32 #include "tgsi_dump.h"
  33 #include "tgsi_info.h"
  34 #include "tgsi_iterate.h"
  35 #include "tgsi_strings.h"
  36
  37
  38 /** Number of spaces to indent for IF/LOOP/etc */
  39 static const int indent_spaces = 3;
  40
  41
  42 struct dump_ctx
  43 {
  44    struct tgsi_iterate_context iter;
  45
  46    uint instno;
  47    uint immno;
  48    int indent;
  49
  50    uint indentation;
  51
  52    void (*dump_printf)(struct dump_ctx *ctx, const char *format, ...);
  53 };
  54
  55 static void
  56 dump_ctx_printf(struct dump_ctx *ctx, const char *format, ...)
  57 {
  58    va_list ap;
  59    (void)ctx;
  60    va_start(ap, format);
  61    _debug_vprintf(format, ap);
  62    va_end(ap);
  63 }
  64
  65 static void
  66 dump_enum(
  67    struct dump_ctx *ctx,
  68    uint e,
  69    const char **enums,
  70    uint enum_count )
  71 {
  72    if (e >= enum_count)
  73       ctx->dump_printf( ctx, "%u", e );
  74    else
  75       ctx->dump_printf( ctx, "%s", enums[e] );
  76 }
  77
  78 #define EOL()           ctx->dump_printf( ctx, "\n" )
  79 #define TXT(S)          ctx->dump_printf( ctx, "%s", S )
  80 #define CHR(C)          ctx->dump_printf( ctx, "%c", C )
  81 #define UIX(I)          ctx->dump_printf( ctx, "0x%x", I )
  82 #define UID(I)          ctx->dump_printf( ctx, "%u", I )
  83 #define INSTID(I)       ctx->dump_printf( ctx, "% 3u", I )
  84 #define SID(I)          ctx->dump_printf( ctx, "%d", I )
  85 #define FLT(F)          ctx->dump_printf( ctx, "%10.4f", F )
  86 #define ENM(E,ENUMS)    dump_enum( ctx, E, ENUMS, sizeof( ENUMS ) / sizeof( *ENUMS ) )
  87
  88 const char *
  89 tgsi_swizzle_names[4] =
  90 {
  91    "x",
  92    "y",
  93    "z",
  94    "w"
  95 };
  96
  97 static void
  98 _dump_register_src(
  99    struct dump_ctx *ctx,
 100    const struct tgsi_full_src_register *src )
 101 {
 102    TXT(tgsi_file_name(src->Register.File));
 103    if (src->Register.Dimension) {
 104       if (src->Dimension.Indirect) {
 105          CHR( '[' );
 106          TXT(tgsi_file_name(src->DimIndirect.File));
 107          CHR( '[' );
 108          SID( src->DimIndirect.Index );
 109          TXT( "]." );
 110          ENM( src->DimIndirect.Swizzle, tgsi_swizzle_names );
 111          if (src->Dimension.Index != 0) {
 112             if (src->Dimension.Index > 0)
 113                CHR( '+' );
 114             SID( src->Dimension.Index );
 115          }
 116          CHR( ']' );
 117          if (src->DimIndirect.ArrayID) {
 118             CHR( '(' );
 119             SID( src->DimIndirect.ArrayID );
 120             CHR( ')' );
 121          }
 122       } else {
 123          CHR('[');
 124          SID(src->Dimension.Index);
 125          CHR(']');
 126       }
 127    }
 128    if (src->Register.Indirect) {
 129       CHR( '[' );
 130       TXT(tgsi_file_name(src->Indirect.File));
 131       CHR( '[' );
 132       SID( src->Indirect.Index );
 133       TXT( "]." );
 134       ENM( src->Indirect.Swizzle, tgsi_swizzle_names );
 135       if (src->Register.Index != 0) {
 136          if (src->Register.Index > 0)
 137             CHR( '+' );
 138          SID( src->Register.Index );
 139       }
 140       CHR( ']' );
 141       if (src->Indirect.ArrayID) {
 142          CHR( '(' );
 143          SID( src->Indirect.ArrayID );
 144          CHR( ')' );
 145       }
 146    } else {
 147       CHR( '[' );
 148       SID( src->Register.Index );
 149       CHR( ']' );
 150    }
 151 }
 152
 153
 154 static void
 155 _dump_register_dst(
 156    struct dump_ctx *ctx,
 157    const struct tgsi_full_dst_register *dst )
 158 {
 159    TXT(tgsi_file_name(dst->Register.File));
 160    if (dst->Register.Dimension) {
 161       if (dst->Dimension.Indirect) {
 162          CHR( '[' );
 163          TXT(tgsi_file_name(dst->DimIndirect.File));
 164          CHR( '[' );
 165          SID( dst->DimIndirect.Index );
 166          TXT( "]." );
 167          ENM( dst->DimIndirect.Swizzle, tgsi_swizzle_names );
 168          if (dst->Dimension.Index != 0) {
 169             if (dst->Dimension.Index > 0)
 170                CHR( '+' );
 171             SID( dst->Dimension.Index );
 172          }
 173          CHR( ']' );
 174          if (dst->DimIndirect.ArrayID) {
 175             CHR( '(' );
 176             SID( dst->DimIndirect.ArrayID );
 177             CHR( ')' );
 178          }
 179       } else {
 180          CHR('[');
 181          SID(dst->Dimension.Index);
 182          CHR(']');
 183       }
 184    }
 185    if (dst->Register.Indirect) {
 186       CHR( '[' );
 187       TXT(tgsi_file_name(dst->Indirect.File));
 188       CHR( '[' );
 189       SID( dst->Indirect.Index );
 190       TXT( "]." );
 191       ENM( dst->Indirect.Swizzle, tgsi_swizzle_names );
 192       if (dst->Register.Index != 0) {
 193          if (dst->Register.Index > 0)
 194             CHR( '+' );
 195          SID( dst->Register.Index );
 196       }
 197       CHR( ']' );
 198       if (dst->Indirect.ArrayID) {
 199          CHR( '(' );
 200          SID( dst->Indirect.ArrayID );
 201          CHR( ')' );
 202       }
 203    } else {
 204       CHR( '[' );
 205       SID( dst->Register.Index );
 206       CHR( ']' );
 207    }
 208 }
 209 static void
 210 _dump_writemask(
 211    struct dump_ctx *ctx,
 212    uint writemask )
 213 {
 214    if (writemask != TGSI_WRITEMASK_XYZW) {
 215       CHR( '.' );
 216       if (writemask & TGSI_WRITEMASK_X)
 217          CHR( 'x' );
 218       if (writemask & TGSI_WRITEMASK_Y)
 219          CHR( 'y' );
 220       if (writemask & TGSI_WRITEMASK_Z)
 221          CHR( 'z' );
 222       if (writemask & TGSI_WRITEMASK_W)
 223          CHR( 'w' );
 224    }
 225 }
 226
 227 static void
 228 dump_imm_data(struct tgsi_iterate_context *iter,
 229               union tgsi_immediate_data *data,
 230               unsigned num_tokens,
 231               unsigned data_type)
 232 {
 233    struct dump_ctx *ctx = (struct dump_ctx *)iter;
 234    unsigned i ;
 235
 236    TXT( " {" );
 237
 238    assert( num_tokens <= 4 );
 239    for (i = 0; i < num_tokens; i++) {
 240       switch (data_type) {
 241       case TGSI_IMM_FLOAT32:
 242          FLT( data[i].Float );
 243          break;
 244       case TGSI_IMM_UINT32:
 245          UID(data[i].Uint);
 246          break;
 247       case TGSI_IMM_INT32:
 248          SID(data[i].Int);
 249          break;
 250       default:
 251          assert( 0 );
 252       }
 253
 254       if (i < num_tokens - 1)
 255          TXT( ", " );
 256    }
 257    TXT( "}" );
 258 }
 259
 260 static boolean
 261 iter_declaration(
 262    struct tgsi_iterate_context *iter,
 263    struct tgsi_full_declaration *decl )
 264 {
 265    struct dump_ctx *ctx = (struct dump_ctx *)iter;
 266
 267    TXT( "DCL " );
 268
 269    TXT(tgsi_file_name(decl->Declaration.File));
 270
 271    /* all geometry shader inputs are two dimensional */
 272    if (decl->Declaration.File == TGSI_FILE_INPUT &&
 273        iter->processor.Processor == TGSI_PROCESSOR_GEOMETRY) {
 274       TXT("[]");
 275    }
 276
 277    if (decl->Declaration.Dimension) {
 278       CHR('[');
 279       SID(decl->Dim.Index2D);
 280       CHR(']');
 281    }
 282
 283    CHR('[');
 284    SID(decl->Range.First);
 285    if (decl->Range.First != decl->Range.Last) {
 286       TXT("..");
 287       SID(decl->Range.Last);
 288    }
 289    CHR(']');
 290
 291    _dump_writemask(
 292       ctx,
 293       decl->Declaration.UsageMask );
 294
 295    if (decl->Declaration.Array) {
 296       TXT( ", ARRAY(" );
 297       SID(decl->Array.ArrayID);
 298       CHR(')');
 299    }
 300
 301    if (decl->Declaration.Local)
 302       TXT( ", LOCAL" );
 303
 304    if (decl->Declaration.Semantic) {
 305       TXT( ", " );
 306       ENM( decl->Semantic.Name, tgsi_semantic_names );
 307       if (decl->Semantic.Index != 0 ||
 308           decl->Semantic.Name == TGSI_SEMANTIC_TEXCOORD ||
 309           decl->Semantic.Name == TGSI_SEMANTIC_GENERIC) {
 310          CHR( '[' );
 311          UID( decl->Semantic.Index );
 312          CHR( ']' );
 313       }
 314    }
 315
 316    if (decl->Declaration.File == TGSI_FILE_RESOURCE) {
 317       TXT(", ");
 318       ENM(decl->Resource.Resource, tgsi_texture_names);
 319       if (decl->Resource.Writable)
 320          TXT(", WR");
 321       if (decl->Resource.Raw)
 322          TXT(", RAW");
 323    }
 324
 325    if (decl->Declaration.File == TGSI_FILE_SAMPLER_VIEW) {
 326       TXT(", ");
 327       ENM(decl->SamplerView.Resource, tgsi_texture_names);
 328       TXT(", ");
 329       if ((decl->SamplerView.ReturnTypeX == decl->SamplerView.ReturnTypeY) &&
 330           (decl->SamplerView.ReturnTypeX == decl->SamplerView.ReturnTypeZ) &&
 331           (decl->SamplerView.ReturnTypeX == decl->SamplerView.ReturnTypeW)) {
 332          ENM(decl->SamplerView.ReturnTypeX, tgsi_type_names);
 333       } else {
 334          ENM(decl->SamplerView.ReturnTypeX, tgsi_type_names);
 335          TXT(", ");
 336          ENM(decl->SamplerView.ReturnTypeY, tgsi_type_names);
 337          TXT(", ");
 338          ENM(decl->SamplerView.ReturnTypeZ, tgsi_type_names);
 339          TXT(", ");
 340          ENM(decl->SamplerView.ReturnTypeW, tgsi_type_names);
 341       }
 342    }
 343
 344    if (decl->Declaration.Interpolate) {
 345       if (iter->processor.Processor == TGSI_PROCESSOR_FRAGMENT &&
 346           decl->Declaration.File == TGSI_FILE_INPUT)
 347       {
 348          TXT( ", " );
 349          ENM( decl->Interp.Interpolate, tgsi_interpolate_names );
 350       }
 351
 352       if (decl->Interp.Centroid) {
 353          TXT( ", CENTROID" );
 354       }
 355
 356       if (decl->Interp.CylindricalWrap) {
 357          TXT(", CYLWRAP_");
 358          if (decl->Interp.CylindricalWrap & TGSI_CYLINDRICAL_WRAP_X) {
 359             CHR('X');
 360          }
 361          if (decl->Interp.CylindricalWrap & TGSI_CYLINDRICAL_WRAP_Y) {
 362             CHR('Y');
 363          }
 364          if (decl->Interp.CylindricalWrap & TGSI_CYLINDRICAL_WRAP_Z) {
 365             CHR('Z');
 366          }
 367          if (decl->Interp.CylindricalWrap & TGSI_CYLINDRICAL_WRAP_W) {
 368             CHR('W');
 369          }
 370       }
 371    }
 372
 373    if (decl->Declaration.Invariant) {
 374       TXT( ", INVARIANT" );
 375    }
 376
 377    EOL();
 378
 379    return TRUE;
 380 }
 381
 382 void
 383 tgsi_dump_declaration(
 384    const struct tgsi_full_declaration *decl )
 385 {
 386    struct dump_ctx ctx;
 387
 388    ctx.dump_printf = dump_ctx_printf;
 389
 390    iter_declaration( &ctx.iter, (struct tgsi_full_declaration *)decl );
 391 }
 392
 393 static boolean
 394 iter_property(
 395    struct tgsi_iterate_context *iter,
 396    struct tgsi_full_property *prop )
 397 {
 398    unsigned i;
 399    struct dump_ctx *ctx = (struct dump_ctx *)iter;
 400
 401    TXT( "PROPERTY " );
 402    ENM(prop->Property.PropertyName, tgsi_property_names);
 403
 404    if (prop->Property.NrTokens > 1)
 405       TXT(" ");
 406
 407    for (i = 0; i < prop->Property.NrTokens - 1; ++i) {
 408       switch (prop->Property.PropertyName) {
 409       case TGSI_PROPERTY_GS_INPUT_PRIM:
 410       case TGSI_PROPERTY_GS_OUTPUT_PRIM:
 411          ENM(prop->u[i].Data, tgsi_primitive_names);
 412          break;
 413       case TGSI_PROPERTY_FS_COORD_ORIGIN:
 414          ENM(prop->u[i].Data, tgsi_fs_coord_origin_names);
 415          break;
 416       case TGSI_PROPERTY_FS_COORD_PIXEL_CENTER:
 417          ENM(prop->u[i].Data, tgsi_fs_coord_pixel_center_names);
 418          break;
 419       default:
 420          SID( prop->u[i].Data );
 421          break;
 422       }
 423       if (i < prop->Property.NrTokens - 2)
 424          TXT( ", " );
 425    }
 426    EOL();
 427
 428    return TRUE;
 429 }
 430
 431 void tgsi_dump_property(
 432    const struct tgsi_full_property *prop )
 433 {
 434    struct dump_ctx ctx;
 435
 436    ctx.dump_printf = dump_ctx_printf;
 437
 438    iter_property( &ctx.iter, (struct tgsi_full_property *)prop );
 439 }
 440
 441 static boolean
 442 iter_immediate(
 443    struct tgsi_iterate_context *iter,
 444    struct tgsi_full_immediate *imm )
 445 {
 446    struct dump_ctx *ctx = (struct dump_ctx *) iter;
 447
 448    TXT( "IMM[" );
 449    SID( ctx->immno++ );
 450    TXT( "] " );
 451    ENM( imm->Immediate.DataType, tgsi_immediate_type_names );
 452
 453    dump_imm_data(iter, imm->u, imm->Immediate.NrTokens - 1,
 454                  imm->Immediate.DataType);
 455
 456    EOL();
 457
 458    return TRUE;
 459 }
 460
 461 void
 462 tgsi_dump_immediate(
 463    const struct tgsi_full_immediate *imm )
 464 {
 465    struct dump_ctx ctx;
 466
 467    ctx.dump_printf = dump_ctx_printf;
 468
 469    iter_immediate( &ctx.iter, (struct tgsi_full_immediate *)imm );
 470 }
 471
 472 static boolean
 473 iter_instruction(
 474    struct tgsi_iterate_context *iter,
 475    struct tgsi_full_instruction *inst )
 476 {
 477    struct dump_ctx *ctx = (struct dump_ctx *) iter;
 478    uint instno = ctx->instno++;
 479    const struct tgsi_opcode_info *info = tgsi_get_opcode_info( inst->Instruction.Opcode );
 480    uint i;
 481    boolean first_reg = TRUE;
 482
 483    INSTID( instno );
 484    TXT( ": " );
 485
 486    ctx->indent -= info->pre_dedent;
 487    for(i = 0; (int)i < ctx->indent; ++i)
 488       TXT( "  " );
 489    ctx->indent += info->post_indent;
 490
 491    if (inst->Instruction.Predicate) {
 492       CHR( '(' );
 493
 494       if (inst->Predicate.Negate)
 495          CHR( '!' );
 496
 497       TXT( "PRED[" );
 498       SID( inst->Predicate.Index );
 499       CHR( ']' );
 500
 501       if (inst->Predicate.SwizzleX != TGSI_SWIZZLE_X ||
 502           inst->Predicate.SwizzleY != TGSI_SWIZZLE_Y ||
 503           inst->Predicate.SwizzleZ != TGSI_SWIZZLE_Z ||
 504           inst->Predicate.SwizzleW != TGSI_SWIZZLE_W) {
 505          CHR( '.' );
 506          ENM( inst->Predicate.SwizzleX, tgsi_swizzle_names );
 507          ENM( inst->Predicate.SwizzleY, tgsi_swizzle_names );
 508          ENM( inst->Predicate.SwizzleZ, tgsi_swizzle_names );
 509          ENM( inst->Predicate.SwizzleW, tgsi_swizzle_names );
 510       }
 511
 512       TXT( ") " );
 513    }
 514
 515    TXT( info->mnemonic );
 516
 517    switch (inst->Instruction.Saturate) {
 518    case TGSI_SAT_NONE:
 519       break;
 520    case TGSI_SAT_ZERO_ONE:
 521       TXT( "_SAT" );
 522       break;
 523    case TGSI_SAT_MINUS_PLUS_ONE:
 524       TXT( "_SATNV" );
 525       break;
 526    default:
 527       assert( 0 );
 528    }
 529
 530    for (i = 0; i < inst->Instruction.NumDstRegs; i++) {
 531       const struct tgsi_full_dst_register *dst = &inst->Dst[i];
 532
 533       if (!first_reg)
 534          CHR( ',' );
 535       CHR( ' ' );
 536
 537       _dump_register_dst( ctx, dst );
 538       _dump_writemask( ctx, dst->Register.WriteMask );
 539
 540       first_reg = FALSE;
 541    }
 542
 543    for (i = 0; i < inst->Instruction.NumSrcRegs; i++) {
 544       const struct tgsi_full_src_register *src = &inst->Src[i];
 545
 546       if (!first_reg)
 547          CHR( ',' );
 548       CHR( ' ' );
 549
 550       if (src->Register.Negate)
 551          CHR( '-' );
 552       if (src->Register.Absolute)
 553          CHR( '|' );
 554
 555       _dump_register_src(ctx, src);
 556
 557       if (src->Register.SwizzleX != TGSI_SWIZZLE_X ||
 558           src->Register.SwizzleY != TGSI_SWIZZLE_Y ||
 559           src->Register.SwizzleZ != TGSI_SWIZZLE_Z ||
 560           src->Register.SwizzleW != TGSI_SWIZZLE_W) {
 561          CHR( '.' );
 562          ENM( src->Register.SwizzleX, tgsi_swizzle_names );
 563          ENM( src->Register.SwizzleY, tgsi_swizzle_names );
 564          ENM( src->Register.SwizzleZ, tgsi_swizzle_names );
 565          ENM( src->Register.SwizzleW, tgsi_swizzle_names );
 566       }
 567
 568       if (src->Register.Absolute)
 569          CHR( '|' );
 570
 571       first_reg = FALSE;
 572    }
 573
 574    if (inst->Instruction.Texture) {
 575       TXT( ", " );
 576       ENM( inst->Texture.Texture, tgsi_texture_names );
 577       for (i = 0; i < inst->Texture.NumOffsets; i++) {
 578          TXT( ", " );
 579          TXT(tgsi_file_name(inst->TexOffsets[i].File));
 580          CHR( '[' );
 581          SID( inst->TexOffsets[i].Index );
 582          CHR( ']' );
 583          CHR( '.' );
 584          ENM( inst->TexOffsets[i].SwizzleX, tgsi_swizzle_names);
 585          ENM( inst->TexOffsets[i].SwizzleY, tgsi_swizzle_names);
 586          ENM( inst->TexOffsets[i].SwizzleZ, tgsi_swizzle_names);
 587       }
 588    }
 589
 590    switch (inst->Instruction.Opcode) {
 591    case TGSI_OPCODE_IF:
 592    case TGSI_OPCODE_UIF:
 593    case TGSI_OPCODE_ELSE:
 594    case TGSI_OPCODE_BGNLOOP:
 595    case TGSI_OPCODE_ENDLOOP:
 596    case TGSI_OPCODE_CAL:
 597       TXT( " :" );
 598       UID( inst->Label.Label );
 599       break;
 600    }
 601
 602    /* update indentation */
 603    if (inst->Instruction.Opcode == TGSI_OPCODE_IF ||
 604        inst->Instruction.Opcode == TGSI_OPCODE_UIF ||
 605        inst->Instruction.Opcode == TGSI_OPCODE_ELSE ||
 606        inst->Instruction.Opcode == TGSI_OPCODE_BGNLOOP) {
 607       ctx->indentation += indent_spaces;
 608    }
 609
 610    EOL();
 611
 612    return TRUE;
 613 }
 614
 615 void
 616 tgsi_dump_instruction(
 617    const struct tgsi_full_instruction *inst,
 618    uint instno )
 619 {
 620    struct dump_ctx ctx;
 621
 622    ctx.instno = instno;
 623    ctx.immno = instno;
 624    ctx.indent = 0;
 625    ctx.dump_printf = dump_ctx_printf;
 626    ctx.indentation = 0;
 627
 628    iter_instruction( &ctx.iter, (struct tgsi_full_instruction *)inst );
 629 }
 630
 631 static boolean
 632 prolog(
 633    struct tgsi_iterate_context *iter )
 634 {
 635    struct dump_ctx *ctx = (struct dump_ctx *) iter;
 636    ENM( iter->processor.Processor, tgsi_processor_type_names );
 637    EOL();
 638    return TRUE;
 639 }
 640
 641 void
 642 tgsi_dump(
 643    const struct tgsi_token *tokens,
 644    uint flags )
 645 {
 646    struct dump_ctx ctx;
 647
 648    ctx.iter.prolog = prolog;
 649    ctx.iter.iterate_instruction = iter_instruction;
 650    ctx.iter.iterate_declaration = iter_declaration;
 651    ctx.iter.iterate_immediate = iter_immediate;
 652    ctx.iter.iterate_property = iter_property;
 653    ctx.iter.epilog = NULL;
 654
 655    ctx.instno = 0;
 656    ctx.immno = 0;
 657    ctx.indent = 0;
 658    ctx.dump_printf = dump_ctx_printf;
 659    ctx.indentation = 0;
 660
 661    tgsi_iterate_shader( tokens, &ctx.iter );
 662 }
 663
 664 struct str_dump_ctx
 665 {
 666    struct dump_ctx base;
 667    char *str;
 668    char *ptr;
 669    int left;
 670 };
 671
 672 static void
 673 str_dump_ctx_printf(struct dump_ctx *ctx, const char *format, ...)
 674 {
 675    struct str_dump_ctx *sctx = (struct str_dump_ctx *)ctx;
 676
 677    if(sctx->left > 1) {
 678       int written;
 679       va_list ap;
 680       va_start(ap, format);
 681       written = util_vsnprintf(sctx->ptr, sctx->left, format, ap);
 682       va_end(ap);
 683
 684       /* Some complicated logic needed to handle the return value of
 685        * vsnprintf:
 686        */
 687       if (written > 0) {
 688          written = MIN2(sctx->left, written);
 689          sctx->ptr += written;
 690          sctx->left -= written;
 691       }
 692    }
 693 }
 694
 695 void
 696 tgsi_dump_str(
 697    const struct tgsi_token *tokens,
 698    uint flags,
 699    char *str,
 700    size_t size)
 701 {
 702    struct str_dump_ctx ctx;
 703
 704    ctx.base.iter.prolog = prolog;
 705    ctx.base.iter.iterate_instruction = iter_instruction;
 706    ctx.base.iter.iterate_declaration = iter_declaration;
 707    ctx.base.iter.iterate_immediate = iter_immediate;
 708    ctx.base.iter.iterate_property = iter_property;
 709    ctx.base.iter.epilog = NULL;
 710
 711    ctx.base.instno = 0;
 712    ctx.base.immno = 0;
 713    ctx.base.indent = 0;
 714    ctx.base.dump_printf = &str_dump_ctx_printf;
 715    ctx.base.indentation = 0;
 716
 717    ctx.str = str;
 718    ctx.str[0] = 0;
 719    ctx.ptr = str;
 720    ctx.left = (int)size;
 721
 722    tgsi_iterate_shader( tokens, &ctx.base.iter );
 723 }
 724
 725 void
 726 tgsi_dump_instruction_str(
 727    const struct tgsi_full_instruction *inst,
 728    uint instno,
 729    char *str,
 730    size_t size)
 731 {
 732    struct str_dump_ctx ctx;
 733
 734    ctx.base.instno = instno;
 735    ctx.base.immno = instno;
 736    ctx.base.indent = 0;
 737    ctx.base.dump_printf = &str_dump_ctx_printf;
 738    ctx.base.indentation = 0;
 739
 740    ctx.str = str;
 741    ctx.str[0] = 0;
 742    ctx.ptr = str;
 743    ctx.left = (int)size;
 744
 745    iter_instruction( &ctx.base.iter, (struct tgsi_full_instruction *)inst );
 746 }