tgsi_parse.c revision 848b8605 
1/**************************************************************************
2 *
3 * Copyright 2007 VMware, Inc.
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 VMWARE 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.Interpolate ) {
117         next_token( ctx, &decl->Interp );
118      }
119
120      if( decl->Declaration.Semantic ) {
121         next_token( ctx, &decl->Semantic );
122      }
123
124      if (decl->Declaration.File == TGSI_FILE_RESOURCE) {
125         next_token(ctx, &decl->Resource);
126      }
127
128      if (decl->Declaration.File == TGSI_FILE_SAMPLER_VIEW) {
129         next_token(ctx, &decl->SamplerView);
130      }
131
132      if( decl->Declaration.Array ) {
133         next_token(ctx, &decl->Array);
134      }
135
136      break;
137   }
138
139   case TGSI_TOKEN_TYPE_IMMEDIATE:
140   {
141      struct tgsi_full_immediate *imm = &ctx->FullToken.FullImmediate;
142      uint imm_count;
143
144      memset(imm, 0, sizeof *imm);
145      copy_token(&imm->Immediate, &token);
146
147      imm_count = imm->Immediate.NrTokens - 1;
148
149      switch (imm->Immediate.DataType) {
150      case TGSI_IMM_FLOAT32:
151         for (i = 0; i < imm_count; i++) {
152            next_token(ctx, &imm->u[i].Float);
153         }
154         break;
155
156      case TGSI_IMM_UINT32:
157         for (i = 0; i < imm_count; i++) {
158            next_token(ctx, &imm->u[i].Uint);
159         }
160         break;
161
162      case TGSI_IMM_INT32:
163         for (i = 0; i < imm_count; i++) {
164            next_token(ctx, &imm->u[i].Int);
165         }
166         break;
167
168      default:
169         assert( 0 );
170      }
171
172      break;
173   }
174
175   case TGSI_TOKEN_TYPE_INSTRUCTION:
176   {
177      struct tgsi_full_instruction *inst = &ctx->FullToken.FullInstruction;
178
179      memset(inst, 0, sizeof *inst);
180      copy_token(&inst->Instruction, &token);
181
182      if (inst->Instruction.Predicate) {
183         next_token(ctx, &inst->Predicate);
184      }
185
186      if (inst->Instruction.Label) {
187         next_token( ctx, &inst->Label);
188      }
189
190      if (inst->Instruction.Texture) {
191         next_token( ctx, &inst->Texture);
192         for( i = 0; i < inst->Texture.NumOffsets; i++ ) {
193            next_token( ctx, &inst->TexOffsets[i] );
194         }
195      }
196
197      assert( inst->Instruction.NumDstRegs <= TGSI_FULL_MAX_DST_REGISTERS );
198
199      for(  i = 0; i < inst->Instruction.NumDstRegs; i++ ) {
200
201         next_token( ctx, &inst->Dst[i].Register );
202
203         if( inst->Dst[i].Register.Indirect )
204            next_token( ctx, &inst->Dst[i].Indirect );
205
206         if( inst->Dst[i].Register.Dimension ) {
207            next_token( ctx, &inst->Dst[i].Dimension );
208
209            /*
210             * No support for multi-dimensional addressing.
211             */
212            assert( !inst->Dst[i].Dimension.Dimension );
213
214            if( inst->Dst[i].Dimension.Indirect )
215               next_token( ctx, &inst->Dst[i].DimIndirect );
216         }
217      }
218
219      assert( inst->Instruction.NumSrcRegs <= TGSI_FULL_MAX_SRC_REGISTERS );
220
221      for( i = 0; i < inst->Instruction.NumSrcRegs; i++ ) {
222
223         next_token( ctx, &inst->Src[i].Register );
224
225         if( inst->Src[i].Register.Indirect )
226            next_token( ctx, &inst->Src[i].Indirect );
227
228         if( inst->Src[i].Register.Dimension ) {
229            next_token( ctx, &inst->Src[i].Dimension );
230
231            /*
232             * No support for multi-dimensional addressing.
233             */
234            assert( !inst->Src[i].Dimension.Dimension );
235
236            if( inst->Src[i].Dimension.Indirect )
237               next_token( ctx, &inst->Src[i].DimIndirect );
238         }
239      }
240
241      break;
242   }
243
244   case TGSI_TOKEN_TYPE_PROPERTY:
245   {
246      struct tgsi_full_property *prop = &ctx->FullToken.FullProperty;
247      uint prop_count;
248
249      memset(prop, 0, sizeof *prop);
250      copy_token(&prop->Property, &token);
251
252      prop_count = prop->Property.NrTokens - 1;
253      for (i = 0; i < prop_count; i++) {
254         next_token(ctx, &prop->u[i]);
255      }
256
257      break;
258   }
259
260   default:
261      assert( 0 );
262   }
263}
264
265
266
267
268/**
269 * Make a new copy of a token array.
270 */
271struct tgsi_token *
272tgsi_dup_tokens(const struct tgsi_token *tokens)
273{
274   unsigned n = tgsi_num_tokens(tokens);
275   unsigned bytes = n * sizeof(struct tgsi_token);
276   struct tgsi_token *new_tokens = (struct tgsi_token *) MALLOC(bytes);
277   if (new_tokens)
278      memcpy(new_tokens, tokens, bytes);
279   return new_tokens;
280}
281
282
283/**
284 * Allocate memory for num_tokens tokens.
285 */
286struct tgsi_token *
287tgsi_alloc_tokens(unsigned num_tokens)
288{
289   unsigned bytes = num_tokens * sizeof(struct tgsi_token);
290   return (struct tgsi_token *) MALLOC(bytes);
291}
292
293
294void
295tgsi_dump_tokens(const struct tgsi_token *tokens)
296{
297   const unsigned *dwords = (const unsigned *)tokens;
298   int nr = tgsi_num_tokens(tokens);
299   int i;
300
301   assert(sizeof(*tokens) == sizeof(unsigned));
302
303   debug_printf("const unsigned tokens[%d] = {\n", nr);
304   for (i = 0; i < nr; i++)
305      debug_printf("0x%08x,\n", dwords[i]);
306   debug_printf("};\n");
307}
308