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       break;
 121    }
 122
 123    case TGSI_TOKEN_TYPE_IMMEDIATE:
 124    {
 125       struct tgsi_full_immediate *imm = &ctx->FullToken.FullImmediate;
 126       uint imm_count;
 127
 128       memset(imm, 0, sizeof *imm);
 129       copy_token(&imm->Immediate, &token);
 130
 131       imm_count = imm->Immediate.NrTokens - 1;
 132
 133       switch (imm->Immediate.DataType) {
 134       case TGSI_IMM_FLOAT32:
 135          for (i = 0; i < imm_count; i++) {
 136             next_token(ctx, &imm->u[i].Float);
 137          }
 138          break;
 139
 140       case TGSI_IMM_UINT32:
 141          for (i = 0; i < imm_count; i++) {
 142             next_token(ctx, &imm->u[i].Uint);
 143          }
 144          break;
 145
 146       case TGSI_IMM_INT32:
 147          for (i = 0; i < imm_count; i++) {
 148             next_token(ctx, &imm->u[i].Int);
 149          }
 150          break;
 151
 152       default:
 153          assert( 0 );
 154       }
 155
 156       break;
 157    }
 158
 159    case TGSI_TOKEN_TYPE_INSTRUCTION:
 160    {
 161       struct tgsi_full_instruction *inst = &ctx->FullToken.FullInstruction;
 162
 163       memset(inst, 0, sizeof *inst);
 164       copy_token(&inst->Instruction, &token);
 165
 166       if (inst->Instruction.Predicate) {
 167          next_token(ctx, &inst->Predicate);
 168       }
 169
 170       if (inst->Instruction.Label) {
 171          next_token( ctx, &inst->Label);
 172       }
 173
 174       if (inst->Instruction.Texture) {
 175          next_token( ctx, &inst->Texture);
 176       }
 177
 178       assert( inst->Instruction.NumDstRegs <= TGSI_FULL_MAX_DST_REGISTERS );
 179
 180       for(  i = 0; i < inst->Instruction.NumDstRegs; i++ ) {
 181
 182          next_token( ctx, &inst->Dst[i].Register );
 183
 184          /*
 185           * No support for indirect or multi-dimensional addressing.
 186           */
 187          assert( !inst->Dst[i].Register.Dimension );
 188
 189          if( inst->Dst[i].Register.Indirect ) {
 190             next_token( ctx, &inst->Dst[i].Indirect );
 191
 192             /*
 193              * No support for indirect or multi-dimensional addressing.
 194              */
 195             assert( !inst->Dst[i].Indirect.Dimension );
 196             assert( !inst->Dst[i].Indirect.Indirect );
 197          }
 198       }
 199
 200       assert( inst->Instruction.NumSrcRegs <= TGSI_FULL_MAX_SRC_REGISTERS );
 201
 202       for( i = 0; i < inst->Instruction.NumSrcRegs; i++ ) {
 203
 204          next_token( ctx, &inst->Src[i].Register );
 205
 206          if( inst->Src[i].Register.Indirect ) {
 207             next_token( ctx, &inst->Src[i].Indirect );
 208
 209             /*
 210              * No support for indirect or multi-dimensional addressing.
 211              */
 212             assert( !inst->Src[i].Indirect.Indirect );
 213             assert( !inst->Src[i].Indirect.Dimension );
 214          }
 215
 216          if( inst->Src[i].Register.Dimension ) {
 217             next_token( ctx, &inst->Src[i].Dimension );
 218
 219             /*
 220              * No support for multi-dimensional addressing.
 221              */
 222             assert( !inst->Src[i].Dimension.Dimension );
 223
 224             if( inst->Src[i].Dimension.Indirect ) {
 225                next_token( ctx, &inst->Src[i].DimIndirect );
 226
 227                /*
 228                * No support for indirect or multi-dimensional addressing.
 229                */
 230                assert( !inst->Src[i].Indirect.Indirect );
 231                assert( !inst->Src[i].Indirect.Dimension );
 232             }
 233          }
 234       }
 235
 236       break;
 237    }
 238
 239    case TGSI_TOKEN_TYPE_PROPERTY:
 240    {
 241       struct tgsi_full_property *prop = &ctx->FullToken.FullProperty;
 242       uint prop_count;
 243
 244       memset(prop, 0, sizeof *prop);
 245       copy_token(&prop->Property, &token);
 246
 247       prop_count = prop->Property.NrTokens - 1;
 248       for (i = 0; i < prop_count; i++) {
 249          next_token(ctx, &prop->u[i]);
 250       }
 251
 252       break;
 253    }
 254
 255    default:
 256       assert( 0 );
 257    }
 258 }
 259
 260
 261 unsigned
 262 tgsi_num_tokens(const struct tgsi_token *tokens)
 263 {
 264    struct tgsi_parse_context ctx;
 265    if (tgsi_parse_init(&ctx, tokens) == TGSI_PARSE_OK) {
 266       unsigned len = (ctx.FullHeader.Header.HeaderSize +
 267                       ctx.FullHeader.Header.BodySize);
 268       return len;
 269    }
 270    return 0;
 271 }
 272
 273
 274 /**
 275  * Make a new copy of a token array.
 276  */
 277 struct tgsi_token *
 278 tgsi_dup_tokens(const struct tgsi_token *tokens)
 279 {
 280    unsigned n = tgsi_num_tokens(tokens);
 281    unsigned bytes = n * sizeof(struct tgsi_token);
 282    struct tgsi_token *new_tokens = (struct tgsi_token *) MALLOC(bytes);
 283    if (new_tokens)
 284       memcpy(new_tokens, tokens, bytes);
 285    return new_tokens;
 286 }