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 "util/u_memory.h"
  32
  33 void
  34 tgsi_full_token_init(
  35    union tgsi_full_token *full_token )
  36 {
  37    full_token->Token.Type = TGSI_TOKEN_TYPE_DECLARATION;
  38 }
  39
  40 void
  41 tgsi_full_token_free(
  42    union tgsi_full_token *full_token )
  43 {
  44 }
  45
  46 unsigned
  47 tgsi_parse_init(
  48    struct tgsi_parse_context *ctx,
  49    const struct tgsi_token *tokens )
  50 {
  51    ctx->FullVersion.Version = *(struct tgsi_version *) &tokens[0];
  52    if( ctx->FullVersion.Version.MajorVersion > 1 ) {
  53       return TGSI_PARSE_ERROR;
  54    }
  55
  56    ctx->FullHeader.Header = *(struct tgsi_header *) &tokens[1];
  57    if( ctx->FullHeader.Header.HeaderSize >= 2 ) {
  58       ctx->FullHeader.Processor = *(struct tgsi_processor *) &tokens[2];
  59    }
  60    else {
  61       return TGSI_PARSE_ERROR;
  62    }
  63
  64    ctx->Tokens = tokens;
  65    ctx->Position = 1 + ctx->FullHeader.Header.HeaderSize;
  66
  67    tgsi_full_token_init( &ctx->FullToken );
  68
  69    return TGSI_PARSE_OK;
  70 }
  71
  72 void
  73 tgsi_parse_free(
  74    struct tgsi_parse_context *ctx )
  75 {
  76    tgsi_full_token_free( &ctx->FullToken );
  77 }
  78
  79 boolean
  80 tgsi_parse_end_of_tokens(
  81    struct tgsi_parse_context *ctx )
  82 {
  83    return ctx->Position >=
  84       1 + ctx->FullHeader.Header.HeaderSize + ctx->FullHeader.Header.BodySize;
  85 }
  86
  87
  88 /**
  89  * This function is used to avoid and work-around type punning/aliasing
  90  * warnings.  The warnings seem harmless on x86 but on PPC they cause
  91  * real failures.
  92  */
  93 static INLINE void
  94 copy_token(void *dst, const void *src)
  95 {
  96    memcpy(dst, src, 4);
  97 }
  98
  99
 100 /**
 101  * Get next 4-byte token, return it at address specified by 'token'
 102  */
 103 static void
 104 next_token(
 105    struct tgsi_parse_context *ctx,
 106    void *token )
 107 {
 108    assert( !tgsi_parse_end_of_tokens( ctx ) );
 109    copy_token(token, &ctx->Tokens[ctx->Position]);
 110    ctx->Position++;
 111 }
 112
 113
 114 void
 115 tgsi_parse_token(
 116    struct tgsi_parse_context *ctx )
 117 {
 118    struct tgsi_token token;
 119    unsigned i;
 120
 121    tgsi_full_token_free( &ctx->FullToken );
 122    tgsi_full_token_init( &ctx->FullToken );
 123
 124    next_token( ctx, &token );
 125
 126    switch( token.Type ) {
 127    case TGSI_TOKEN_TYPE_DECLARATION:
 128    {
 129       struct tgsi_full_declaration *decl = &ctx->FullToken.FullDeclaration;
 130
 131       memset(decl, 0, sizeof *decl);
 132       copy_token(&decl->Declaration, &token);
 133
 134       next_token( ctx, &decl->DeclarationRange );
 135
 136       if( decl->Declaration.Semantic ) {
 137          next_token( ctx, &decl->Semantic );
 138       }
 139
 140       break;
 141    }
 142
 143    case TGSI_TOKEN_TYPE_IMMEDIATE:
 144    {
 145       struct tgsi_full_immediate *imm = &ctx->FullToken.FullImmediate;
 146
 147       memset(imm, 0, sizeof *imm);
 148       copy_token(&imm->Immediate, &token);
 149
 150       switch (imm->Immediate.DataType) {
 151       case TGSI_IMM_FLOAT32:
 152          {
 153             uint imm_count = imm->Immediate.NrTokens - 1;
 154             for (i = 0; i < imm_count; i++) {
 155                next_token(ctx, &imm->u[i]);
 156             }
 157          }
 158          break;
 159
 160       default:
 161          assert( 0 );
 162       }
 163
 164       break;
 165    }
 166
 167    case TGSI_TOKEN_TYPE_INSTRUCTION:
 168    {
 169       struct tgsi_full_instruction *inst = &ctx->FullToken.FullInstruction;
 170
 171       memset(inst, 0, sizeof *inst);
 172       copy_token(&inst->Instruction, &token);
 173
 174       if (inst->Instruction.Predicate) {
 175          next_token(ctx, &inst->InstructionPredicate);
 176       }
 177
 178       if (inst->Instruction.Label) {
 179          next_token( ctx, &inst->InstructionLabel);
 180       }
 181
 182       if (inst->Instruction.Texture) {
 183          next_token( ctx, &inst->InstructionTexture);
 184       }
 185
 186       assert( inst->Instruction.NumDstRegs <= TGSI_FULL_MAX_DST_REGISTERS );
 187
 188       for(  i = 0; i < inst->Instruction.NumDstRegs; i++ ) {
 189
 190          next_token( ctx, &inst->FullDstRegisters[i].DstRegister );
 191
 192          /*
 193           * No support for indirect or multi-dimensional addressing.
 194           */
 195          assert( !inst->FullDstRegisters[i].DstRegister.Dimension );
 196
 197          if( inst->FullDstRegisters[i].DstRegister.Indirect ) {
 198             next_token( ctx, &inst->FullDstRegisters[i].DstRegisterInd );
 199
 200             /*
 201              * No support for indirect or multi-dimensional addressing.
 202              */
 203             assert( !inst->FullDstRegisters[i].DstRegisterInd.Dimension );
 204             assert( !inst->FullDstRegisters[i].DstRegisterInd.Indirect );
 205          }
 206       }
 207
 208       assert( inst->Instruction.NumSrcRegs <= TGSI_FULL_MAX_SRC_REGISTERS );
 209
 210       for( i = 0; i < inst->Instruction.NumSrcRegs; i++ ) {
 211
 212          next_token( ctx, &inst->FullSrcRegisters[i].SrcRegister );
 213
 214          if( inst->FullSrcRegisters[i].SrcRegister.Indirect ) {
 215             next_token( ctx, &inst->FullSrcRegisters[i].SrcRegisterInd );
 216
 217             /*
 218              * No support for indirect or multi-dimensional addressing.
 219              */
 220             assert( !inst->FullSrcRegisters[i].SrcRegisterInd.Indirect );
 221             assert( !inst->FullSrcRegisters[i].SrcRegisterInd.Dimension );
 222          }
 223
 224          if( inst->FullSrcRegisters[i].SrcRegister.Dimension ) {
 225             next_token( ctx, &inst->FullSrcRegisters[i].SrcRegisterDim );
 226
 227             /*
 228              * No support for multi-dimensional addressing.
 229              */
 230             assert( !inst->FullSrcRegisters[i].SrcRegisterDim.Dimension );
 231
 232             if( inst->FullSrcRegisters[i].SrcRegisterDim.Indirect ) {
 233                next_token( ctx, &inst->FullSrcRegisters[i].SrcRegisterDimInd );
 234
 235                /*
 236                * No support for indirect or multi-dimensional addressing.
 237                */
 238                assert( !inst->FullSrcRegisters[i].SrcRegisterInd.Indirect );
 239                assert( !inst->FullSrcRegisters[i].SrcRegisterInd.Dimension );
 240             }
 241          }
 242       }
 243
 244       break;
 245    }
 246
 247    default:
 248       assert( 0 );
 249    }
 250 }
 251
 252
 253 unsigned
 254 tgsi_num_tokens(const struct tgsi_token *tokens)
 255 {
 256    struct tgsi_parse_context ctx;
 257    if (tgsi_parse_init(&ctx, tokens) == TGSI_PARSE_OK) {
 258       unsigned len = (ctx.FullHeader.Header.HeaderSize +
 259                       ctx.FullHeader.Header.BodySize +
 260                       1);
 261       return len;
 262    }
 263    return 0;
 264 }
 265
 266
 267 /**
 268  * Make a new copy of a token array.
 269  */
 270 struct tgsi_token *
 271 tgsi_dup_tokens(const struct tgsi_token *tokens)
 272 {
 273    unsigned n = tgsi_num_tokens(tokens);
 274    unsigned bytes = n * sizeof(struct tgsi_token);
 275    struct tgsi_token *new_tokens = (struct tgsi_token *) MALLOC(bytes);
 276    if (new_tokens)
 277       memcpy(new_tokens, tokens, bytes);
 278    return new_tokens;
 279 }