tgsi_parse.c revision baa7ff47d548cdcc1ea68657ee1b0500f78041be 
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 "tgsi_build.h"
32#include "util/u_memory.h"
33
34void
35tgsi_full_token_init(
36   union tgsi_full_token *full_token )
37{
38   full_token->Token.Type = TGSI_TOKEN_TYPE_DECLARATION;
39}
40
41void
42tgsi_full_token_free(
43   union tgsi_full_token *full_token )
44{
45   if( full_token->Token.Type == TGSI_TOKEN_TYPE_IMMEDIATE ) {
46      FREE( (void *) full_token->FullImmediate.u.Pointer );
47   }
48}
49
50unsigned
51tgsi_parse_init(
52   struct tgsi_parse_context *ctx,
53   const struct tgsi_token *tokens )
54{
55   ctx->FullVersion.Version = *(struct tgsi_version *) &tokens[0];
56   if( ctx->FullVersion.Version.MajorVersion > 1 ) {
57      return TGSI_PARSE_ERROR;
58   }
59
60   ctx->FullHeader.Header = *(struct tgsi_header *) &tokens[1];
61   if( ctx->FullHeader.Header.HeaderSize >= 2 ) {
62      ctx->FullHeader.Processor = *(struct tgsi_processor *) &tokens[2];
63   }
64   else {
65      ctx->FullHeader.Processor = tgsi_default_processor();
66   }
67
68   ctx->Tokens = tokens;
69   ctx->Position = 1 + ctx->FullHeader.Header.HeaderSize;
70
71   tgsi_full_token_init( &ctx->FullToken );
72
73   return TGSI_PARSE_OK;
74}
75
76void
77tgsi_parse_free(
78   struct tgsi_parse_context *ctx )
79{
80   tgsi_full_token_free( &ctx->FullToken );
81}
82
83boolean
84tgsi_parse_end_of_tokens(
85   struct tgsi_parse_context *ctx )
86{
87   return ctx->Position >=
88      1 + ctx->FullHeader.Header.HeaderSize + ctx->FullHeader.Header.BodySize;
89}
90
91
92/**
93 * This function is used to avoid and work-around type punning/aliasing
94 * warnings.  The warnings seem harmless on x86 but on PPC they cause
95 * real failures.
96 */
97static INLINE void
98copy_token(void *dst, const void *src)
99{
100   memcpy(dst, src, 4);
101}
102
103
104/**
105 * Get next 4-byte token, return it at address specified by 'token'
106 */
107static void
108next_token(
109   struct tgsi_parse_context *ctx,
110   void *token )
111{
112   assert( !tgsi_parse_end_of_tokens( ctx ) );
113   copy_token(token, &ctx->Tokens[ctx->Position]);
114   ctx->Position++;
115}
116
117
118void
119tgsi_parse_token(
120   struct tgsi_parse_context *ctx )
121{
122   struct tgsi_token token;
123   unsigned i;
124
125   tgsi_full_token_free( &ctx->FullToken );
126   tgsi_full_token_init( &ctx->FullToken );
127
128   next_token( ctx, &token );
129
130   switch( token.Type ) {
131   case TGSI_TOKEN_TYPE_DECLARATION:
132   {
133      struct tgsi_full_declaration *decl = &ctx->FullToken.FullDeclaration;
134
135      *decl = tgsi_default_full_declaration();
136      copy_token(&decl->Declaration, &token);
137
138      next_token( ctx, &decl->DeclarationRange );
139
140      if( decl->Declaration.Semantic ) {
141         next_token( ctx, &decl->Semantic );
142      }
143
144      break;
145   }
146
147   case TGSI_TOKEN_TYPE_IMMEDIATE:
148   {
149      struct tgsi_full_immediate *imm = &ctx->FullToken.FullImmediate;
150
151      *imm = tgsi_default_full_immediate();
152      copy_token(&imm->Immediate, &token);
153      assert( !imm->Immediate.Extended );
154
155      switch (imm->Immediate.DataType) {
156      case TGSI_IMM_FLOAT32:
157         {
158            uint imm_count = imm->Immediate.NrTokens - 1;
159            struct tgsi_immediate_float32 *data;
160
161            data = (struct tgsi_immediate_float32 *) MALLOC(sizeof(struct tgsi_immediate_float32) * imm_count);
162            if (data) {
163               for (i = 0; i < imm_count; i++) {
164                  next_token(ctx, &data[i]);
165               }
166               imm->u.ImmediateFloat32 = data;
167            }
168         }
169         break;
170
171      default:
172         assert( 0 );
173      }
174
175      break;
176   }
177
178   case TGSI_TOKEN_TYPE_INSTRUCTION:
179   {
180      struct tgsi_full_instruction *inst = &ctx->FullToken.FullInstruction;
181      unsigned extended;
182
183      *inst = tgsi_default_full_instruction();
184      copy_token(&inst->Instruction, &token);
185      extended = inst->Instruction.Extended;
186
187      while( extended ) {
188         struct tgsi_src_register_ext token;
189
190         next_token( ctx, &token );
191
192         switch( token.Type ) {
193         case TGSI_INSTRUCTION_EXT_TYPE_NV:
194            copy_token(&inst->InstructionExtNv, &token);
195            break;
196
197         case TGSI_INSTRUCTION_EXT_TYPE_LABEL:
198            copy_token(&inst->InstructionExtLabel, &token);
199            break;
200
201         case TGSI_INSTRUCTION_EXT_TYPE_TEXTURE:
202            copy_token(&inst->InstructionExtTexture, &token);
203            break;
204
205         default:
206            assert( 0 );
207         }
208
209         extended = token.Extended;
210      }
211
212      assert( inst->Instruction.NumDstRegs <= TGSI_FULL_MAX_DST_REGISTERS );
213
214      for(  i = 0; i < inst->Instruction.NumDstRegs; i++ ) {
215         unsigned extended;
216
217         next_token( ctx, &inst->FullDstRegisters[i].DstRegister );
218
219         /*
220          * No support for indirect or multi-dimensional addressing.
221          */
222         assert( !inst->FullDstRegisters[i].DstRegister.Dimension );
223
224         extended = inst->FullDstRegisters[i].DstRegister.Extended;
225
226         while( extended ) {
227            struct tgsi_src_register_ext token;
228
229            next_token( ctx, &token );
230
231            switch( token.Type ) {
232            case TGSI_DST_REGISTER_EXT_TYPE_CONDCODE:
233               copy_token(&inst->FullDstRegisters[i].DstRegisterExtConcode,
234                          &token);
235               break;
236
237            case TGSI_DST_REGISTER_EXT_TYPE_MODULATE:
238               copy_token(&inst->FullDstRegisters[i].DstRegisterExtModulate,
239                          &token);
240               break;
241
242            default:
243               assert( 0 );
244            }
245
246            extended = token.Extended;
247         }
248
249         if( inst->FullDstRegisters[i].DstRegister.Indirect ) {
250            next_token( ctx, &inst->FullDstRegisters[i].DstRegisterInd );
251
252            /*
253             * No support for indirect or multi-dimensional addressing.
254             */
255            assert( !inst->FullDstRegisters[i].DstRegisterInd.Indirect );
256            assert( !inst->FullDstRegisters[i].DstRegisterInd.Dimension );
257            assert( !inst->FullDstRegisters[i].DstRegisterInd.Extended );
258         }
259      }
260
261      assert( inst->Instruction.NumSrcRegs <= TGSI_FULL_MAX_SRC_REGISTERS );
262
263      for( i = 0; i < inst->Instruction.NumSrcRegs; i++ ) {
264         unsigned extended;
265
266         next_token( ctx, &inst->FullSrcRegisters[i].SrcRegister );
267
268         extended = inst->FullSrcRegisters[i].SrcRegister.Extended;
269
270         while( extended ) {
271            struct tgsi_src_register_ext token;
272
273            next_token( ctx, &token );
274
275            switch( token.Type ) {
276            case TGSI_SRC_REGISTER_EXT_TYPE_SWZ:
277               copy_token(&inst->FullSrcRegisters[i].SrcRegisterExtSwz,
278                          &token);
279               break;
280
281            case TGSI_SRC_REGISTER_EXT_TYPE_MOD:
282               copy_token(&inst->FullSrcRegisters[i].SrcRegisterExtMod,
283                          &token);
284               break;
285
286            default:
287               assert( 0 );
288            }
289
290            extended = token.Extended;
291         }
292
293         if( inst->FullSrcRegisters[i].SrcRegister.Indirect ) {
294            next_token( ctx, &inst->FullSrcRegisters[i].SrcRegisterInd );
295
296            /*
297             * No support for indirect or multi-dimensional addressing.
298             */
299            assert( !inst->FullSrcRegisters[i].SrcRegisterInd.Indirect );
300            assert( !inst->FullSrcRegisters[i].SrcRegisterInd.Dimension );
301            assert( !inst->FullSrcRegisters[i].SrcRegisterInd.Extended );
302         }
303
304         if( inst->FullSrcRegisters[i].SrcRegister.Dimension ) {
305            next_token( ctx, &inst->FullSrcRegisters[i].SrcRegisterDim );
306
307            /*
308             * No support for multi-dimensional addressing.
309             */
310            assert( !inst->FullSrcRegisters[i].SrcRegisterDim.Dimension );
311            assert( !inst->FullSrcRegisters[i].SrcRegisterDim.Extended );
312
313            if( inst->FullSrcRegisters[i].SrcRegisterDim.Indirect ) {
314               next_token( ctx, &inst->FullSrcRegisters[i].SrcRegisterDimInd );
315
316               /*
317               * No support for indirect or multi-dimensional addressing.
318               */
319               assert( !inst->FullSrcRegisters[i].SrcRegisterInd.Indirect );
320               assert( !inst->FullSrcRegisters[i].SrcRegisterInd.Dimension );
321               assert( !inst->FullSrcRegisters[i].SrcRegisterInd.Extended );
322            }
323         }
324      }
325
326      break;
327   }
328
329   default:
330      assert( 0 );
331   }
332}
333
334
335unsigned
336tgsi_num_tokens(const struct tgsi_token *tokens)
337{
338   struct tgsi_parse_context ctx;
339   if (tgsi_parse_init(&ctx, tokens) == TGSI_PARSE_OK) {
340      unsigned len = (ctx.FullHeader.Header.HeaderSize +
341                      ctx.FullHeader.Header.BodySize +
342                      1);
343      return len;
344   }
345   return 0;
346}
347
348
349/**
350 * Make a new copy of a token array.
351 */
352struct tgsi_token *
353tgsi_dup_tokens(const struct tgsi_token *tokens)
354{
355   unsigned n = tgsi_num_tokens(tokens);
356   unsigned bytes = n * sizeof(struct tgsi_token);
357   struct tgsi_token *new_tokens = (struct tgsi_token *) MALLOC(bytes);
358   if (new_tokens)
359      memcpy(new_tokens, tokens, bytes);
360   return new_tokens;
361}
362