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.Semantic ) {
 113          next_token( ctx, &decl->Semantic );
 114       }
 115
 116       break;
 117    }
 118
 119    case TGSI_TOKEN_TYPE_IMMEDIATE:
 120    {
 121       struct tgsi_full_immediate *imm = &ctx->FullToken.FullImmediate;
 122       uint imm_count;
 123
 124       memset(imm, 0, sizeof *imm);
 125       copy_token(&imm->Immediate, &token);
 126
 127       imm_count = imm->Immediate.NrTokens - 1;
 128
 129       switch (imm->Immediate.DataType) {
 130       case TGSI_IMM_FLOAT32:
 131          for (i = 0; i < imm_count; i++) {
 132             next_token(ctx, &imm->u[i].Float);
 133          }
 134          break;
 135
 136       case TGSI_IMM_UINT32:
 137          for (i = 0; i < imm_count; i++) {
 138             next_token(ctx, &imm->u[i].Uint);
 139          }
 140          break;
 141
 142       case TGSI_IMM_INT32:
 143          for (i = 0; i < imm_count; i++) {
 144             next_token(ctx, &imm->u[i].Int);
 145          }
 146          break;
 147
 148       default:
 149          assert( 0 );
 150       }
 151
 152       break;
 153    }
 154
 155    case TGSI_TOKEN_TYPE_INSTRUCTION:
 156    {
 157       struct tgsi_full_instruction *inst = &ctx->FullToken.FullInstruction;
 158
 159       memset(inst, 0, sizeof *inst);
 160       copy_token(&inst->Instruction, &token);
 161
 162       if (inst->Instruction.Predicate) {
 163          next_token(ctx, &inst->Predicate);
 164       }
 165
 166       if (inst->Instruction.Label) {
 167          next_token( ctx, &inst->Label);
 168       }
 169
 170       if (inst->Instruction.Texture) {
 171          next_token( ctx, &inst->Texture);
 172       }
 173
 174       assert( inst->Instruction.NumDstRegs <= TGSI_FULL_MAX_DST_REGISTERS );
 175
 176       for(  i = 0; i < inst->Instruction.NumDstRegs; i++ ) {
 177
 178          next_token( ctx, &inst->Dst[i].Register );
 179
 180          /*
 181           * No support for indirect or multi-dimensional addressing.
 182           */
 183          assert( !inst->Dst[i].Register.Dimension );
 184
 185          if( inst->Dst[i].Register.Indirect ) {
 186             next_token( ctx, &inst->Dst[i].Indirect );
 187
 188             /*
 189              * No support for indirect or multi-dimensional addressing.
 190              */
 191             assert( !inst->Dst[i].Indirect.Dimension );
 192             assert( !inst->Dst[i].Indirect.Indirect );
 193          }
 194       }
 195
 196       assert( inst->Instruction.NumSrcRegs <= TGSI_FULL_MAX_SRC_REGISTERS );
 197
 198       for( i = 0; i < inst->Instruction.NumSrcRegs; i++ ) {
 199
 200          next_token( ctx, &inst->Src[i].Register );
 201
 202          if( inst->Src[i].Register.Indirect ) {
 203             next_token( ctx, &inst->Src[i].Indirect );
 204
 205             /*
 206              * No support for indirect or multi-dimensional addressing.
 207              */
 208             assert( !inst->Src[i].Indirect.Indirect );
 209             assert( !inst->Src[i].Indirect.Dimension );
 210          }
 211
 212          if( inst->Src[i].Register.Dimension ) {
 213             next_token( ctx, &inst->Src[i].Dimension );
 214
 215             /*
 216              * No support for multi-dimensional addressing.
 217              */
 218             assert( !inst->Src[i].Dimension.Dimension );
 219
 220             if( inst->Src[i].Dimension.Indirect ) {
 221                next_token( ctx, &inst->Src[i].DimIndirect );
 222
 223                /*
 224                * No support for indirect or multi-dimensional addressing.
 225                */
 226                assert( !inst->Src[i].Indirect.Indirect );
 227                assert( !inst->Src[i].Indirect.Dimension );
 228             }
 229          }
 230       }
 231
 232       break;
 233    }
 234
 235    case TGSI_TOKEN_TYPE_PROPERTY:
 236    {
 237       struct tgsi_full_property *prop = &ctx->FullToken.FullProperty;
 238       uint prop_count;
 239
 240       memset(prop, 0, sizeof *prop);
 241       copy_token(&prop->Property, &token);
 242
 243       prop_count = prop->Property.NrTokens - 1;
 244       for (i = 0; i < prop_count; i++) {
 245          next_token(ctx, &prop->u[i]);
 246       }
 247
 248       break;
 249    }
 250
 251    default:
 252       assert( 0 );
 253    }
 254 }
 255
 256
 257 unsigned
 258 tgsi_num_tokens(const struct tgsi_token *tokens)
 259 {
 260    struct tgsi_parse_context ctx;
 261    if (tgsi_parse_init(&ctx, tokens) == TGSI_PARSE_OK) {
 262       unsigned len = (ctx.FullHeader.Header.HeaderSize +
 263                       ctx.FullHeader.Header.BodySize);
 264       return len;
 265    }
 266    return 0;
 267 }
 268
 269
 270 /**
 271  * Make a new copy of a token array.
 272  */
 273 struct tgsi_token *
 274 tgsi_dup_tokens(const struct tgsi_token *tokens)
 275 {
 276    unsigned n = tgsi_num_tokens(tokens);
 277    unsigned bytes = n * sizeof(struct tgsi_token);
 278    struct tgsi_token *new_tokens = (struct tgsi_token *) MALLOC(bytes);
 279    if (new_tokens)
 280       memcpy(new_tokens, tokens, bytes);
 281    return new_tokens;
 282 }