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