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.Semantic ) {
 117          next_token( ctx, &decl->Semantic );
 118       }
 119
 120       if (decl->Declaration.File == TGSI_FILE_IMMEDIATE_ARRAY) {
 121          unsigned i, j;
 122          decl->ImmediateData.u = (union tgsi_immediate_data*)
 123                                  &ctx->Tokens[ctx->Position];
 124          for (i = 0; i <= decl->Range.Last; ++i) {
 125             for (j = 0; j < 4; ++j) {
 126                ctx->Position++;
 127             }
 128          }
 129       }
 130
 131       break;
 132    }
 133
 134    case TGSI_TOKEN_TYPE_IMMEDIATE:
 135    {
 136       struct tgsi_full_immediate *imm = &ctx->FullToken.FullImmediate;
 137       uint imm_count;
 138
 139       memset(imm, 0, sizeof *imm);
 140       copy_token(&imm->Immediate, &token);
 141
 142       imm_count = imm->Immediate.NrTokens - 1;
 143
 144       switch (imm->Immediate.DataType) {
 145       case TGSI_IMM_FLOAT32:
 146          for (i = 0; i < imm_count; i++) {
 147             next_token(ctx, &imm->u[i].Float);
 148          }
 149          break;
 150
 151       case TGSI_IMM_UINT32:
 152          for (i = 0; i < imm_count; i++) {
 153             next_token(ctx, &imm->u[i].Uint);
 154          }
 155          break;
 156
 157       case TGSI_IMM_INT32:
 158          for (i = 0; i < imm_count; i++) {
 159             next_token(ctx, &imm->u[i].Int);
 160          }
 161          break;
 162
 163       default:
 164          assert( 0 );
 165       }
 166
 167       break;
 168    }
 169
 170    case TGSI_TOKEN_TYPE_INSTRUCTION:
 171    {
 172       struct tgsi_full_instruction *inst = &ctx->FullToken.FullInstruction;
 173
 174       memset(inst, 0, sizeof *inst);
 175       copy_token(&inst->Instruction, &token);
 176
 177       if (inst->Instruction.Predicate) {
 178          next_token(ctx, &inst->Predicate);
 179       }
 180
 181       if (inst->Instruction.Label) {
 182          next_token( ctx, &inst->Label);
 183       }
 184
 185       if (inst->Instruction.Texture) {
 186          next_token( ctx, &inst->Texture);
 187       }
 188
 189       assert( inst->Instruction.NumDstRegs <= TGSI_FULL_MAX_DST_REGISTERS );
 190
 191       for(  i = 0; i < inst->Instruction.NumDstRegs; i++ ) {
 192
 193          next_token( ctx, &inst->Dst[i].Register );
 194
 195          if( inst->Dst[i].Register.Indirect ) {
 196             next_token( ctx, &inst->Dst[i].Indirect );
 197
 198             /*
 199              * No support for indirect or multi-dimensional addressing.
 200              */
 201             assert( !inst->Dst[i].Indirect.Dimension );
 202             assert( !inst->Dst[i].Indirect.Indirect );
 203          }
 204          if( inst->Dst[i].Register.Dimension ) {
 205             next_token( ctx, &inst->Dst[i].Dimension );
 206
 207             /*
 208              * No support for multi-dimensional addressing.
 209              */
 210             assert( !inst->Dst[i].Dimension.Dimension );
 211
 212             if( inst->Dst[i].Dimension.Indirect ) {
 213                next_token( ctx, &inst->Dst[i].DimIndirect );
 214
 215                /*
 216                 * No support for indirect or multi-dimensional addressing.
 217                 */
 218                assert( !inst->Dst[i].Indirect.Indirect );
 219                assert( !inst->Dst[i].Indirect.Dimension );
 220             }
 221          }
 222       }
 223
 224       assert( inst->Instruction.NumSrcRegs <= TGSI_FULL_MAX_SRC_REGISTERS );
 225
 226       for( i = 0; i < inst->Instruction.NumSrcRegs; i++ ) {
 227
 228          next_token( ctx, &inst->Src[i].Register );
 229
 230          if( inst->Src[i].Register.Indirect ) {
 231             next_token( ctx, &inst->Src[i].Indirect );
 232
 233             /*
 234              * No support for indirect or multi-dimensional addressing.
 235              */
 236             assert( !inst->Src[i].Indirect.Indirect );
 237             assert( !inst->Src[i].Indirect.Dimension );
 238          }
 239
 240          if( inst->Src[i].Register.Dimension ) {
 241             next_token( ctx, &inst->Src[i].Dimension );
 242
 243             /*
 244              * No support for multi-dimensional addressing.
 245              */
 246             assert( !inst->Src[i].Dimension.Dimension );
 247
 248             if( inst->Src[i].Dimension.Indirect ) {
 249                next_token( ctx, &inst->Src[i].DimIndirect );
 250
 251                /*
 252                * No support for indirect or multi-dimensional addressing.
 253                */
 254                assert( !inst->Src[i].Indirect.Indirect );
 255                assert( !inst->Src[i].Indirect.Dimension );
 256             }
 257          }
 258       }
 259
 260       break;
 261    }
 262
 263    case TGSI_TOKEN_TYPE_PROPERTY:
 264    {
 265       struct tgsi_full_property *prop = &ctx->FullToken.FullProperty;
 266       uint prop_count;
 267
 268       memset(prop, 0, sizeof *prop);
 269       copy_token(&prop->Property, &token);
 270
 271       prop_count = prop->Property.NrTokens - 1;
 272       for (i = 0; i < prop_count; i++) {
 273          next_token(ctx, &prop->u[i]);
 274       }
 275
 276       break;
 277    }
 278
 279    default:
 280       assert( 0 );
 281    }
 282 }
 283
 284
 285
 286
 287 /**
 288  * Make a new copy of a token array.
 289  */
 290 struct tgsi_token *
 291 tgsi_dup_tokens(const struct tgsi_token *tokens)
 292 {
 293    unsigned n = tgsi_num_tokens(tokens);
 294    unsigned bytes = n * sizeof(struct tgsi_token);
 295    struct tgsi_token *new_tokens = (struct tgsi_token *) MALLOC(bytes);
 296    if (new_tokens)
 297       memcpy(new_tokens, tokens, bytes);
 298    return new_tokens;
 299 }
 300
 301
 302 /**
 303  * Allocate memory for num_tokens tokens.
 304  */
 305 struct tgsi_token *
 306 tgsi_alloc_tokens(unsigned num_tokens)
 307 {
 308    unsigned bytes = num_tokens * sizeof(struct tgsi_token);
 309    return (struct tgsi_token *) MALLOC(bytes);
 310 }
 311
 312
 313 void
 314 tgsi_dump_tokens(const struct tgsi_token *tokens)
 315 {
 316    const unsigned *dwords = (const unsigned *)tokens;
 317    int nr = tgsi_num_tokens(tokens);
 318    int i;
 319
 320    assert(sizeof(*tokens) == sizeof(unsigned));
 321
 322    debug_printf("const unsigned tokens[%d] = {\n", nr);
 323    for (i = 0; i < nr; i++)
 324       debug_printf("0x%08x,\n", dwords[i]);
 325    debug_printf("};\n");
 326 }