tgsi_parse.c revision bd34b8a4febb7aadec0545250fd8b6b06ad774e8 
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 "pipe/p_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         imm->u.Pointer = MALLOC(
158            sizeof( struct tgsi_immediate_float32 ) * (imm->Immediate.Size - 1) );
159         for( i = 0; i < imm->Immediate.Size - 1; i++ ) {
160            next_token( ctx, (struct tgsi_immediate_float32 *) &imm->u.ImmediateFloat32[i] );
161         }
162         break;
163
164      default:
165         assert( 0 );
166      }
167
168      break;
169   }
170
171   case TGSI_TOKEN_TYPE_INSTRUCTION:
172   {
173      struct tgsi_full_instruction *inst = &ctx->FullToken.FullInstruction;
174      unsigned extended;
175
176      *inst = tgsi_default_full_instruction();
177      copy_token(&inst->Instruction, &token);
178      extended = inst->Instruction.Extended;
179
180      while( extended ) {
181         struct tgsi_src_register_ext token;
182
183         next_token( ctx, &token );
184
185         switch( token.Type ) {
186         case TGSI_INSTRUCTION_EXT_TYPE_NV:
187            copy_token(&inst->InstructionExtNv, &token);
188            break;
189
190         case TGSI_INSTRUCTION_EXT_TYPE_LABEL:
191            copy_token(&inst->InstructionExtLabel, &token);
192            break;
193
194         case TGSI_INSTRUCTION_EXT_TYPE_TEXTURE:
195            copy_token(&inst->InstructionExtTexture, &token);
196            break;
197
198         default:
199            assert( 0 );
200         }
201
202         extended = token.Extended;
203      }
204
205      assert( inst->Instruction.NumDstRegs <= TGSI_FULL_MAX_DST_REGISTERS );
206
207      for(  i = 0; i < inst->Instruction.NumDstRegs; i++ ) {
208         unsigned extended;
209
210         next_token( ctx, &inst->FullDstRegisters[i].DstRegister );
211
212         /*
213          * No support for indirect or multi-dimensional addressing.
214          */
215         assert( !inst->FullDstRegisters[i].DstRegister.Indirect );
216         assert( !inst->FullDstRegisters[i].DstRegister.Dimension );
217
218         extended = inst->FullDstRegisters[i].DstRegister.Extended;
219
220         while( extended ) {
221            struct tgsi_src_register_ext token;
222
223            next_token( ctx, &token );
224
225            switch( token.Type ) {
226            case TGSI_DST_REGISTER_EXT_TYPE_CONDCODE:
227               copy_token(&inst->FullDstRegisters[i].DstRegisterExtConcode,
228                          &token);
229               break;
230
231            case TGSI_DST_REGISTER_EXT_TYPE_MODULATE:
232               copy_token(&inst->FullDstRegisters[i].DstRegisterExtModulate,
233                          &token);
234               break;
235
236            default:
237               assert( 0 );
238            }
239
240            extended = token.Extended;
241         }
242      }
243
244      assert( inst->Instruction.NumSrcRegs <= TGSI_FULL_MAX_SRC_REGISTERS );
245
246      for( i = 0; i < inst->Instruction.NumSrcRegs; i++ ) {
247         unsigned extended;
248
249         next_token( ctx, &inst->FullSrcRegisters[i].SrcRegister );
250
251         extended = inst->FullSrcRegisters[i].SrcRegister.Extended;
252
253         while( extended ) {
254            struct tgsi_src_register_ext token;
255
256            next_token( ctx, &token );
257
258            switch( token.Type ) {
259            case TGSI_SRC_REGISTER_EXT_TYPE_SWZ:
260               copy_token(&inst->FullSrcRegisters[i].SrcRegisterExtSwz,
261                          &token);
262               break;
263
264            case TGSI_SRC_REGISTER_EXT_TYPE_MOD:
265               copy_token(&inst->FullSrcRegisters[i].SrcRegisterExtMod,
266                          &token);
267               break;
268
269            default:
270               assert( 0 );
271            }
272
273            extended = token.Extended;
274         }
275
276         if( inst->FullSrcRegisters[i].SrcRegister.Indirect ) {
277            next_token( ctx, &inst->FullSrcRegisters[i].SrcRegisterInd );
278
279            /*
280             * No support for indirect or multi-dimensional addressing.
281             */
282            assert( !inst->FullSrcRegisters[i].SrcRegisterInd.Indirect );
283            assert( !inst->FullSrcRegisters[i].SrcRegisterInd.Dimension );
284            assert( !inst->FullSrcRegisters[i].SrcRegisterInd.Extended );
285         }
286
287         if( inst->FullSrcRegisters[i].SrcRegister.Dimension ) {
288            next_token( ctx, &inst->FullSrcRegisters[i].SrcRegisterDim );
289
290            /*
291             * No support for multi-dimensional addressing.
292             */
293            assert( !inst->FullSrcRegisters[i].SrcRegisterDim.Dimension );
294            assert( !inst->FullSrcRegisters[i].SrcRegisterDim.Extended );
295
296            if( inst->FullSrcRegisters[i].SrcRegisterDim.Indirect ) {
297               next_token( ctx, &inst->FullSrcRegisters[i].SrcRegisterDimInd );
298
299               /*
300               * No support for indirect or multi-dimensional addressing.
301               */
302               assert( !inst->FullSrcRegisters[i].SrcRegisterInd.Indirect );
303               assert( !inst->FullSrcRegisters[i].SrcRegisterInd.Dimension );
304               assert( !inst->FullSrcRegisters[i].SrcRegisterInd.Extended );
305            }
306         }
307      }
308
309      break;
310   }
311
312   default:
313      assert( 0 );
314   }
315}
316
317
318unsigned
319tgsi_num_tokens(const struct tgsi_token *tokens)
320{
321   struct tgsi_parse_context ctx;
322   if (tgsi_parse_init(&ctx, tokens) == TGSI_PARSE_OK) {
323      unsigned len = (ctx.FullHeader.Header.HeaderSize +
324                      ctx.FullHeader.Header.BodySize +
325                      1);
326      return len;
327   }
328   return 0;
329}
330
331
332/**
333 * Make a new copy of a token array.
334 */
335struct tgsi_token *
336tgsi_dup_tokens(const struct tgsi_token *tokens)
337{
338   unsigned n = tgsi_num_tokens(tokens);
339   unsigned bytes = n * sizeof(struct tgsi_token);
340   struct tgsi_token *new_tokens = (struct tgsi_token *) MALLOC(bytes);
341   if (new_tokens)
342      memcpy(new_tokens, tokens, bytes);
343   return new_tokens;
344}
345