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 unsigned
  34 tgsi_parse_init(
  35    struct tgsi_parse_context *ctx,
  36    const struct tgsi_token *tokens )
  37 {
  38    ctx->FullHeader.Header = *(struct tgsi_header *) &tokens[0];
  39    if( ctx->FullHeader.Header.HeaderSize >= 2 ) {
  40       ctx->FullHeader.Processor = *(struct tgsi_processor *) &tokens[1];
  41    }
  42    else {
  43       return TGSI_PARSE_ERROR;
  44    }
  45
  46    ctx->Tokens = tokens;
  47    ctx->Position = ctx->FullHeader.Header.HeaderSize;
  48
  49    return TGSI_PARSE_OK;
  50 }
  51
  52 void
  53 tgsi_parse_free(
  54    struct tgsi_parse_context *ctx )
  55 {
  56 }
  57
  58 boolean
  59 tgsi_parse_end_of_tokens(
  60    struct tgsi_parse_context *ctx )
  61 {
  62    return ctx->Position >=
  63       ctx->FullHeader.Header.HeaderSize + ctx->FullHeader.Header.BodySize;
  64 }
  65
  66
  67 /**
  68  * This function is used to avoid and work-around type punning/aliasing
  69  * warnings.  The warnings seem harmless on x86 but on PPC they cause
  70  * real failures.
  71  */
  72 static INLINE void
  73 copy_token(void *dst, const void *src)
  74 {
  75    memcpy(dst, src, 4);
  76 }
  77
  78
  79 /**
  80  * Get next 4-byte token, return it at address specified by 'token'
  81  */
  82 static void
  83 next_token(
  84    struct tgsi_parse_context *ctx,
  85    void *token )
  86 {
  87    assert( !tgsi_parse_end_of_tokens( ctx ) );
  88    copy_token(token, &ctx->Tokens[ctx->Position]);
  89    ctx->Position++;
  90 }
  91
  92
  93 void
  94 tgsi_parse_token(
  95    struct tgsi_parse_context *ctx )
  96 {
  97    struct tgsi_token token;
  98    unsigned i;
  99
 100    next_token( ctx, &token );
 101
 102    switch( token.Type ) {
 103    case TGSI_TOKEN_TYPE_DECLARATION:
 104    {
 105       struct tgsi_full_declaration *decl = &ctx->FullToken.FullDeclaration;
 106
 107       memset(decl, 0, sizeof *decl);
 108       copy_token(&decl->Declaration, &token);
 109
 110       next_token( ctx, &decl->Range );
 111
 112       if (decl->Declaration.Dimension) {
 113          next_token(ctx, &decl->Dim);
 114       }
 115
 116       if( decl->Declaration.Interpolate ) {
 117          next_token( ctx, &decl->Interp );
 118       }
 119
 120       if( decl->Declaration.Semantic ) {
 121          next_token( ctx, &decl->Semantic );
 122       }
 123
 124       if (decl->Declaration.File == TGSI_FILE_RESOURCE) {
 125          next_token(ctx, &decl->Resource);
 126       }
 127
 128       if (decl->Declaration.File == TGSI_FILE_SAMPLER_VIEW) {
 129          next_token(ctx, &decl->SamplerView);
 130       }
 131
 132       if( decl->Declaration.Array ) {
 133          next_token(ctx, &decl->Array);
 134       }
 135
 136       break;
 137    }
 138
 139    case TGSI_TOKEN_TYPE_IMMEDIATE:
 140    {
 141       struct tgsi_full_immediate *imm = &ctx->FullToken.FullImmediate;
 142       uint imm_count;
 143
 144       memset(imm, 0, sizeof *imm);
 145       copy_token(&imm->Immediate, &token);
 146
 147       imm_count = imm->Immediate.NrTokens - 1;
 148
 149       switch (imm->Immediate.DataType) {
 150       case TGSI_IMM_FLOAT32:
 151          for (i = 0; i < imm_count; i++) {
 152             next_token(ctx, &imm->u[i].Float);
 153          }
 154          break;
 155
 156       case TGSI_IMM_UINT32:
 157          for (i = 0; i < imm_count; i++) {
 158             next_token(ctx, &imm->u[i].Uint);
 159          }
 160          break;
 161
 162       case TGSI_IMM_INT32:
 163          for (i = 0; i < imm_count; i++) {
 164             next_token(ctx, &imm->u[i].Int);
 165          }
 166          break;
 167
 168       default:
 169          assert( 0 );
 170       }
 171
 172       break;
 173    }
 174
 175    case TGSI_TOKEN_TYPE_INSTRUCTION:
 176    {
 177       struct tgsi_full_instruction *inst = &ctx->FullToken.FullInstruction;
 178
 179       memset(inst, 0, sizeof *inst);
 180       copy_token(&inst->Instruction, &token);
 181
 182       if (inst->Instruction.Predicate) {
 183          next_token(ctx, &inst->Predicate);
 184       }
 185
 186       if (inst->Instruction.Label) {
 187          next_token( ctx, &inst->Label);
 188       }
 189
 190       if (inst->Instruction.Texture) {
 191          next_token( ctx, &inst->Texture);
 192          for( i = 0; i < inst->Texture.NumOffsets; i++ ) {
 193             next_token( ctx, &inst->TexOffsets[i] );
 194          }
 195       }
 196
 197       assert( inst->Instruction.NumDstRegs <= TGSI_FULL_MAX_DST_REGISTERS );
 198
 199       for(  i = 0; i < inst->Instruction.NumDstRegs; i++ ) {
 200
 201          next_token( ctx, &inst->Dst[i].Register );
 202
 203          if( inst->Dst[i].Register.Indirect )
 204             next_token( ctx, &inst->Dst[i].Indirect );
 205
 206          if( inst->Dst[i].Register.Dimension ) {
 207             next_token( ctx, &inst->Dst[i].Dimension );
 208
 209             /*
 210              * No support for multi-dimensional addressing.
 211              */
 212             assert( !inst->Dst[i].Dimension.Dimension );
 213
 214             if( inst->Dst[i].Dimension.Indirect )
 215                next_token( ctx, &inst->Dst[i].DimIndirect );
 216          }
 217       }
 218
 219       assert( inst->Instruction.NumSrcRegs <= TGSI_FULL_MAX_SRC_REGISTERS );
 220
 221       for( i = 0; i < inst->Instruction.NumSrcRegs; i++ ) {
 222
 223          next_token( ctx, &inst->Src[i].Register );
 224
 225          if( inst->Src[i].Register.Indirect )
 226             next_token( ctx, &inst->Src[i].Indirect );
 227
 228          if( inst->Src[i].Register.Dimension ) {
 229             next_token( ctx, &inst->Src[i].Dimension );
 230
 231             /*
 232              * No support for multi-dimensional addressing.
 233              */
 234             assert( !inst->Src[i].Dimension.Dimension );
 235
 236             if( inst->Src[i].Dimension.Indirect )
 237                next_token( ctx, &inst->Src[i].DimIndirect );
 238          }
 239       }
 240
 241       break;
 242    }
 243
 244    case TGSI_TOKEN_TYPE_PROPERTY:
 245    {
 246       struct tgsi_full_property *prop = &ctx->FullToken.FullProperty;
 247       uint prop_count;
 248
 249       memset(prop, 0, sizeof *prop);
 250       copy_token(&prop->Property, &token);
 251
 252       prop_count = prop->Property.NrTokens - 1;
 253       for (i = 0; i < prop_count; i++) {
 254          next_token(ctx, &prop->u[i]);
 255       }
 256
 257       break;
 258    }
 259
 260    default:
 261       assert( 0 );
 262    }
 263 }
 264
 265
 266
 267
 268 /**
 269  * Make a new copy of a token array.
 270  */
 271 struct tgsi_token *
 272 tgsi_dup_tokens(const struct tgsi_token *tokens)
 273 {
 274    unsigned n = tgsi_num_tokens(tokens);
 275    unsigned bytes = n * sizeof(struct tgsi_token);
 276    struct tgsi_token *new_tokens = (struct tgsi_token *) MALLOC(bytes);
 277    if (new_tokens)
 278       memcpy(new_tokens, tokens, bytes);
 279    return new_tokens;
 280 }
 281
 282
 283 /**
 284  * Allocate memory for num_tokens tokens.
 285  */
 286 struct tgsi_token *
 287 tgsi_alloc_tokens(unsigned num_tokens)
 288 {
 289    unsigned bytes = num_tokens * sizeof(struct tgsi_token);
 290    return (struct tgsi_token *) MALLOC(bytes);
 291 }
 292
 293
 294 void
 295 tgsi_dump_tokens(const struct tgsi_token *tokens)
 296 {
 297    const unsigned *dwords = (const unsigned *)tokens;
 298    int nr = tgsi_num_tokens(tokens);
 299    int i;
 300
 301    assert(sizeof(*tokens) == sizeof(unsigned));
 302
 303    debug_printf("const unsigned tokens[%d] = {\n", nr);
 304    for (i = 0; i < nr; i++)
 305       debug_printf("0x%08x,\n", dwords[i]);
 306    debug_printf("};\n");
 307 }