tgsi_parse.c revision cdc920a0 
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
33unsigned
34tgsi_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
52void
53tgsi_parse_free(
54   struct tgsi_parse_context *ctx )
55{
56}
57
58boolean
59tgsi_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 */
72static INLINE void
73copy_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 */
82static void
83next_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
93void
94tgsi_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.Dimension) {
113         next_token(ctx, &decl->Dim);
114      }
115
116      if( decl->Declaration.Semantic ) {
117         next_token( ctx, &decl->Semantic );
118      }
119
120      break;
121   }
122
123   case TGSI_TOKEN_TYPE_IMMEDIATE:
124   {
125      struct tgsi_full_immediate *imm = &ctx->FullToken.FullImmediate;
126      uint imm_count;
127
128      memset(imm, 0, sizeof *imm);
129      copy_token(&imm->Immediate, &token);
130
131      imm_count = imm->Immediate.NrTokens - 1;
132
133      switch (imm->Immediate.DataType) {
134      case TGSI_IMM_FLOAT32:
135         for (i = 0; i < imm_count; i++) {
136            next_token(ctx, &imm->u[i].Float);
137         }
138         break;
139
140      case TGSI_IMM_UINT32:
141         for (i = 0; i < imm_count; i++) {
142            next_token(ctx, &imm->u[i].Uint);
143         }
144         break;
145
146      case TGSI_IMM_INT32:
147         for (i = 0; i < imm_count; i++) {
148            next_token(ctx, &imm->u[i].Int);
149         }
150         break;
151
152      default:
153         assert( 0 );
154      }
155
156      break;
157   }
158
159   case TGSI_TOKEN_TYPE_INSTRUCTION:
160   {
161      struct tgsi_full_instruction *inst = &ctx->FullToken.FullInstruction;
162
163      memset(inst, 0, sizeof *inst);
164      copy_token(&inst->Instruction, &token);
165
166      if (inst->Instruction.Predicate) {
167         next_token(ctx, &inst->Predicate);
168      }
169
170      if (inst->Instruction.Label) {
171         next_token( ctx, &inst->Label);
172      }
173
174      if (inst->Instruction.Texture) {
175         next_token( ctx, &inst->Texture);
176      }
177
178      assert( inst->Instruction.NumDstRegs <= TGSI_FULL_MAX_DST_REGISTERS );
179
180      for(  i = 0; i < inst->Instruction.NumDstRegs; i++ ) {
181
182         next_token( ctx, &inst->Dst[i].Register );
183
184         /*
185          * No support for indirect or multi-dimensional addressing.
186          */
187         assert( !inst->Dst[i].Register.Dimension );
188
189         if( inst->Dst[i].Register.Indirect ) {
190            next_token( ctx, &inst->Dst[i].Indirect );
191
192            /*
193             * No support for indirect or multi-dimensional addressing.
194             */
195            assert( !inst->Dst[i].Indirect.Dimension );
196            assert( !inst->Dst[i].Indirect.Indirect );
197         }
198      }
199
200      assert( inst->Instruction.NumSrcRegs <= TGSI_FULL_MAX_SRC_REGISTERS );
201
202      for( i = 0; i < inst->Instruction.NumSrcRegs; i++ ) {
203
204         next_token( ctx, &inst->Src[i].Register );
205
206         if( inst->Src[i].Register.Indirect ) {
207            next_token( ctx, &inst->Src[i].Indirect );
208
209            /*
210             * No support for indirect or multi-dimensional addressing.
211             */
212            assert( !inst->Src[i].Indirect.Indirect );
213            assert( !inst->Src[i].Indirect.Dimension );
214         }
215
216         if( inst->Src[i].Register.Dimension ) {
217            next_token( ctx, &inst->Src[i].Dimension );
218
219            /*
220             * No support for multi-dimensional addressing.
221             */
222            assert( !inst->Src[i].Dimension.Dimension );
223
224            if( inst->Src[i].Dimension.Indirect ) {
225               next_token( ctx, &inst->Src[i].DimIndirect );
226
227               /*
228               * No support for indirect or multi-dimensional addressing.
229               */
230               assert( !inst->Src[i].Indirect.Indirect );
231               assert( !inst->Src[i].Indirect.Dimension );
232            }
233         }
234      }
235
236      break;
237   }
238
239   case TGSI_TOKEN_TYPE_PROPERTY:
240   {
241      struct tgsi_full_property *prop = &ctx->FullToken.FullProperty;
242      uint prop_count;
243
244      memset(prop, 0, sizeof *prop);
245      copy_token(&prop->Property, &token);
246
247      prop_count = prop->Property.NrTokens - 1;
248      for (i = 0; i < prop_count; i++) {
249         next_token(ctx, &prop->u[i]);
250      }
251
252      break;
253   }
254
255   default:
256      assert( 0 );
257   }
258}
259
260
261unsigned
262tgsi_num_tokens(const struct tgsi_token *tokens)
263{
264   struct tgsi_parse_context ctx;
265   if (tgsi_parse_init(&ctx, tokens) == TGSI_PARSE_OK) {
266      unsigned len = (ctx.FullHeader.Header.HeaderSize +
267                      ctx.FullHeader.Header.BodySize);
268      return len;
269   }
270   return 0;
271}
272
273
274/**
275 * Make a new copy of a token array.
276 */
277struct tgsi_token *
278tgsi_dup_tokens(const struct tgsi_token *tokens)
279{
280   unsigned n = tgsi_num_tokens(tokens);
281   unsigned bytes = n * sizeof(struct tgsi_token);
282   struct tgsi_token *new_tokens = (struct tgsi_token *) MALLOC(bytes);
283   if (new_tokens)
284      memcpy(new_tokens, tokens, bytes);
285   return new_tokens;
286}
287
288
289/**
290 * Allocate memory for num_tokens tokens.
291 */
292struct tgsi_token *
293tgsi_alloc_tokens(unsigned num_tokens)
294{
295   unsigned bytes = num_tokens * sizeof(struct tgsi_token);
296   return (struct tgsi_token *) MALLOC(bytes);
297}
298