src/gallium/auxiliary/tgsi/tgsi_parse.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   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 TUNGSTEN GRAPHICS 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 "pipe/p_shader_tokens.h"
  30 #include "tgsi_parse.h"
  31 #include "tgsi_build.h"
  32 #include "util/u_memory.h"
  33
  34 void
  35 tgsi_full_token_init(
  36    union tgsi_full_token *full_token )
  37 {
  38    full_token->Token.Type = TGSI_TOKEN_TYPE_DECLARATION;
  39 }
  40
  41 void
  42 tgsi_full_token_free(
  43    union tgsi_full_token *full_token )
  44 {
  45    if( full_token->Token.Type == TGSI_TOKEN_TYPE_IMMEDIATE ) {
  46       FREE( (void *) full_token->FullImmediate.u.Pointer );
  47    }
  48 }
  49
  50 unsigned
  51 tgsi_parse_init(
  52    struct tgsi_parse_context *ctx,
  53    const struct tgsi_token *tokens )
  54 {
  55    ctx->FullVersion.Version = *(struct tgsi_version *) &tokens[0];
  56    if( ctx->FullVersion.Version.MajorVersion > 1 ) {
  57       return TGSI_PARSE_ERROR;
  58    }
  59
  60    ctx->FullHeader.Header = *(struct tgsi_header *) &tokens[1];
  61    if( ctx->FullHeader.Header.HeaderSize >= 2 ) {
  62       ctx->FullHeader.Processor = *(struct tgsi_processor *) &tokens[2];
  63    }
  64    else {
  65       ctx->FullHeader.Processor = tgsi_default_processor();
  66    }
  67
  68    ctx->Tokens = tokens;
  69    ctx->Position = 1 + ctx->FullHeader.Header.HeaderSize;
  70
  71    tgsi_full_token_init( &ctx->FullToken );
  72
  73    return TGSI_PARSE_OK;
  74 }
  75
  76 void
  77 tgsi_parse_free(
  78    struct tgsi_parse_context *ctx )
  79 {
  80    tgsi_full_token_free( &ctx->FullToken );
  81 }
  82
  83 boolean
  84 tgsi_parse_end_of_tokens(
  85    struct tgsi_parse_context *ctx )
  86 {
  87    return ctx->Position >=
  88       1 + ctx->FullHeader.Header.HeaderSize + ctx->FullHeader.Header.BodySize;
  89 }
  90
  91
  92 /**
  93  * This function is used to avoid and work-around type punning/aliasing
  94  * warnings.  The warnings seem harmless on x86 but on PPC they cause
  95  * real failures.
  96  */
  97 static INLINE void
  98 copy_token(void *dst, const void *src)
  99 {
 100    memcpy(dst, src, 4);
 101 }
 102
 103
 104 /**
 105  * Get next 4-byte token, return it at address specified by 'token'
 106  */
 107 static void
 108 next_token(
 109    struct tgsi_parse_context *ctx,
 110    void *token )
 111 {
 112    assert( !tgsi_parse_end_of_tokens( ctx ) );
 113    copy_token(token, &ctx->Tokens[ctx->Position]);
 114    ctx->Position++;
 115 }
 116
 117
 118 void
 119 tgsi_parse_token(
 120    struct tgsi_parse_context *ctx )
 121 {
 122    struct tgsi_token token;
 123    unsigned i;
 124
 125    tgsi_full_token_free( &ctx->FullToken );
 126    tgsi_full_token_init( &ctx->FullToken );
 127
 128    next_token( ctx, &token );
 129
 130    switch( token.Type ) {
 131    case TGSI_TOKEN_TYPE_DECLARATION:
 132    {
 133       struct tgsi_full_declaration *decl = &ctx->FullToken.FullDeclaration;
 134
 135       *decl = tgsi_default_full_declaration();
 136       copy_token(&decl->Declaration, &token);
 137
 138       next_token( ctx, &decl->DeclarationRange );
 139
 140       if( decl->Declaration.Semantic ) {
 141          next_token( ctx, &decl->Semantic );
 142       }
 143
 144       break;
 145    }
 146
 147    case TGSI_TOKEN_TYPE_IMMEDIATE:
 148    {
 149       struct tgsi_full_immediate *imm = &ctx->FullToken.FullImmediate;
 150
 151       *imm = tgsi_default_full_immediate();
 152       copy_token(&imm->Immediate, &token);
 153       assert( !imm->Immediate.Extended );
 154
 155       switch (imm->Immediate.DataType) {
 156       case TGSI_IMM_FLOAT32:
 157          imm->u.Pointer = MALLOC(
 158             sizeof( struct tgsi_immediate_float32 ) * (imm->Immediate.NrTokens - 1) );
 159          for( i = 0; i < imm->Immediate.NrTokens - 1; i++ ) {
 160             next_token( ctx, (struct tgsi_immediate_float32 *) &imm->u.ImmediateFloat32[i] );
 161          }
 162          break;
 163
 164       default:
 165          assert( 0 );
 166       }
 167
 168       break;
 169    }
 170
 171    case TGSI_TOKEN_TYPE_INSTRUCTION:
 172    {
 173       struct tgsi_full_instruction *inst = &ctx->FullToken.FullInstruction;
 174       unsigned extended;
 175
 176       *inst = tgsi_default_full_instruction();
 177       copy_token(&inst->Instruction, &token);
 178       extended = inst->Instruction.Extended;
 179
 180       while( extended ) {
 181          struct tgsi_src_register_ext token;
 182
 183          next_token( ctx, &token );
 184
 185          switch( token.Type ) {
 186          case TGSI_INSTRUCTION_EXT_TYPE_NV:
 187             copy_token(&inst->InstructionExtNv, &token);
 188             break;
 189
 190          case TGSI_INSTRUCTION_EXT_TYPE_LABEL:
 191             copy_token(&inst->InstructionExtLabel, &token);
 192             break;
 193
 194          case TGSI_INSTRUCTION_EXT_TYPE_TEXTURE:
 195             copy_token(&inst->InstructionExtTexture, &token);
 196             break;
 197
 198          default:
 199             assert( 0 );
 200          }
 201
 202          extended = token.Extended;
 203       }
 204
 205       assert( inst->Instruction.NumDstRegs <= TGSI_FULL_MAX_DST_REGISTERS );
 206
 207       for(  i = 0; i < inst->Instruction.NumDstRegs; i++ ) {
 208          unsigned extended;
 209
 210          next_token( ctx, &inst->FullDstRegisters[i].DstRegister );
 211
 212          /*
 213           * No support for indirect or multi-dimensional addressing.
 214           */
 215          assert( !inst->FullDstRegisters[i].DstRegister.Indirect );
 216          assert( !inst->FullDstRegisters[i].DstRegister.Dimension );
 217
 218          extended = inst->FullDstRegisters[i].DstRegister.Extended;
 219
 220          while( extended ) {
 221             struct tgsi_src_register_ext token;
 222
 223             next_token( ctx, &token );
 224
 225             switch( token.Type ) {
 226             case TGSI_DST_REGISTER_EXT_TYPE_CONDCODE:
 227                copy_token(&inst->FullDstRegisters[i].DstRegisterExtConcode,
 228                           &token);
 229                break;
 230
 231             case TGSI_DST_REGISTER_EXT_TYPE_MODULATE:
 232                copy_token(&inst->FullDstRegisters[i].DstRegisterExtModulate,
 233                           &token);
 234                break;
 235
 236             default:
 237                assert( 0 );
 238             }
 239
 240             extended = token.Extended;
 241          }
 242       }
 243
 244       assert( inst->Instruction.NumSrcRegs <= TGSI_FULL_MAX_SRC_REGISTERS );
 245
 246       for( i = 0; i < inst->Instruction.NumSrcRegs; i++ ) {
 247          unsigned extended;
 248
 249          next_token( ctx, &inst->FullSrcRegisters[i].SrcRegister );
 250
 251          extended = inst->FullSrcRegisters[i].SrcRegister.Extended;
 252
 253          while( extended ) {
 254             struct tgsi_src_register_ext token;
 255
 256             next_token( ctx, &token );
 257
 258             switch( token.Type ) {
 259             case TGSI_SRC_REGISTER_EXT_TYPE_SWZ:
 260                copy_token(&inst->FullSrcRegisters[i].SrcRegisterExtSwz,
 261                           &token);
 262                break;
 263
 264             case TGSI_SRC_REGISTER_EXT_TYPE_MOD:
 265                copy_token(&inst->FullSrcRegisters[i].SrcRegisterExtMod,
 266                           &token);
 267                break;
 268
 269             default:
 270                assert( 0 );
 271             }
 272
 273             extended = token.Extended;
 274          }
 275
 276          if( inst->FullSrcRegisters[i].SrcRegister.Indirect ) {
 277             next_token( ctx, &inst->FullSrcRegisters[i].SrcRegisterInd );
 278
 279             /*
 280              * No support for indirect or multi-dimensional addressing.
 281              */
 282             assert( !inst->FullSrcRegisters[i].SrcRegisterInd.Indirect );
 283             assert( !inst->FullSrcRegisters[i].SrcRegisterInd.Dimension );
 284             assert( !inst->FullSrcRegisters[i].SrcRegisterInd.Extended );
 285          }
 286
 287          if( inst->FullSrcRegisters[i].SrcRegister.Dimension ) {
 288             next_token( ctx, &inst->FullSrcRegisters[i].SrcRegisterDim );
 289
 290             /*
 291              * No support for multi-dimensional addressing.
 292              */
 293             assert( !inst->FullSrcRegisters[i].SrcRegisterDim.Dimension );
 294             assert( !inst->FullSrcRegisters[i].SrcRegisterDim.Extended );
 295
 296             if( inst->FullSrcRegisters[i].SrcRegisterDim.Indirect ) {
 297                next_token( ctx, &inst->FullSrcRegisters[i].SrcRegisterDimInd );
 298
 299                /*
 300                * No support for indirect or multi-dimensional addressing.
 301                */
 302                assert( !inst->FullSrcRegisters[i].SrcRegisterInd.Indirect );
 303                assert( !inst->FullSrcRegisters[i].SrcRegisterInd.Dimension );
 304                assert( !inst->FullSrcRegisters[i].SrcRegisterInd.Extended );
 305             }
 306          }
 307       }
 308
 309       break;
 310    }
 311
 312    default:
 313       assert( 0 );
 314    }
 315 }
 316
 317
 318 unsigned
 319 tgsi_num_tokens(const struct tgsi_token *tokens)
 320 {
 321    struct tgsi_parse_context ctx;
 322    if (tgsi_parse_init(&ctx, tokens) == TGSI_PARSE_OK) {
 323       unsigned len = (ctx.FullHeader.Header.HeaderSize +
 324                       ctx.FullHeader.Header.BodySize +
 325                       1);
 326       return len;
 327    }
 328    return 0;
 329 }
 330
 331
 332 /**
 333  * Make a new copy of a token array.
 334  */
 335 struct tgsi_token *
 336 tgsi_dup_tokens(const struct tgsi_token *tokens)
 337 {
 338    unsigned n = tgsi_num_tokens(tokens);
 339    unsigned bytes = n * sizeof(struct tgsi_token);
 340    struct tgsi_token *new_tokens = (struct tgsi_token *) MALLOC(bytes);
 341    if (new_tokens)
 342       memcpy(new_tokens, tokens, bytes);
 343    return new_tokens;
 344 }