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