src/glsl/main.cpp

   1 /*
   2  * Copyright © 2008, 2009 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23 #include <cstdlib>
  24 #include <cstdio>
  25 #include <getopt.h>
  26
  27 #include <sys/types.h>
  28 #include <sys/stat.h>
  29 #include <fcntl.h>
  30 #include <unistd.h>
  31
  32 #include "ast.h"
  33 #include "glsl_parser_extras.h"
  34 #include "glsl_parser.h"
  35 #include "ir_optimization.h"
  36 #include "ir_print_visitor.h"
  37 #include "program.h"
  38 #include "loop_analysis.h"
  39
  40 extern "C" struct gl_shader *
  41 _mesa_new_shader(GLcontext *ctx, GLuint name, GLenum type);
  42
  43 /* Copied from shader_api.c for the stand-alone compiler.
  44  */
  45 struct gl_shader *
  46 _mesa_new_shader(GLcontext *ctx, GLuint name, GLenum type)
  47 {
  48    struct gl_shader *shader;
  49
  50    (void) ctx;
  51
  52    assert(type == GL_FRAGMENT_SHADER || type == GL_VERTEX_SHADER);
  53    shader = talloc_zero(NULL, struct gl_shader);
  54    if (shader) {
  55       shader->Type = type;
  56       shader->Name = name;
  57       shader->RefCount = 1;
  58    }
  59    return shader;
  60 }
  61
  62 /* Returned string will have 'ctx' as its talloc owner. */
  63 static char *
  64 load_text_file(void *ctx, const char *file_name)
  65 {
  66         char *text = NULL;
  67         struct stat st;
  68         ssize_t total_read = 0;
  69         int fd = open(file_name, O_RDONLY);
  70
  71         if (fd < 0) {
  72                 return NULL;
  73         }
  74
  75         if (fstat(fd, & st) == 0) {
  76            text = (char *) talloc_size(ctx, st.st_size + 1);
  77                 if (text != NULL) {
  78                         do {
  79                                 ssize_t bytes = read(fd, text + total_read,
  80                                                      st.st_size - total_read);
  81                                 if (bytes < 0) {
  82                                         free(text);
  83                                         text = NULL;
  84                                         break;
  85                                 }
  86
  87                                 if (bytes == 0) {
  88                                         break;
  89                                 }
  90
  91                                 total_read += bytes;
  92                         } while (total_read < st.st_size);
  93
  94                         text[total_read] = '\0';
  95                 }
  96         }
  97
  98         close(fd);
  99
 100         return text;
 101 }
 102
 103
 104 void
 105 usage_fail(const char *name)
 106 {
 107       printf("%s <filename.frag|filename.vert>\n", name);
 108       exit(EXIT_FAILURE);
 109 }
 110
 111
 112 int dump_ast = 0;
 113 int dump_hir = 0;
 114 int dump_lir = 0;
 115 int do_link = 0;
 116
 117 const struct option compiler_opts[] = {
 118    { "dump-ast", 0, &dump_ast, 1 },
 119    { "dump-hir", 0, &dump_hir, 1 },
 120    { "dump-lir", 0, &dump_lir, 1 },
 121    { "link",     0, &do_link,  1 },
 122    { NULL, 0, NULL, 0 }
 123 };
 124
 125 void
 126 compile_shader(struct gl_shader *shader)
 127 {
 128    struct _mesa_glsl_parse_state *state =
 129       new(shader) _mesa_glsl_parse_state(NULL, shader->Type, shader);
 130
 131    const char *source = shader->Source;
 132    state->error = preprocess(state, &source, &state->info_log,
 133                              state->extensions);
 134
 135    if (!state->error) {
 136       _mesa_glsl_lexer_ctor(state, source);
 137       _mesa_glsl_parse(state);
 138       _mesa_glsl_lexer_dtor(state);
 139    }
 140
 141    if (dump_ast) {
 142       foreach_list_const(n, &state->translation_unit) {
 143          ast_node *ast = exec_node_data(ast_node, n, link);
 144          ast->print();
 145       }
 146       printf("\n\n");
 147    }
 148
 149    shader->ir = new(shader) exec_list;
 150    if (!state->error && !state->translation_unit.is_empty())
 151       _mesa_ast_to_hir(shader->ir, state);
 152
 153    /* Print out the unoptimized IR. */
 154    if (!state->error && dump_hir) {
 155       validate_ir_tree(shader->ir);
 156       _mesa_print_ir(shader->ir, state);
 157    }
 158
 159    /* Optimization passes */
 160    if (!state->error && !shader->ir->is_empty()) {
 161       bool progress;
 162       do {
 163          progress = false;
 164
 165          progress = do_function_inlining(shader->ir) || progress;
 166          progress = do_if_simplification(shader->ir) || progress;
 167          progress = do_copy_propagation(shader->ir) || progress;
 168          progress = do_dead_code_local(shader->ir) || progress;
 169          progress = do_dead_code_unlinked(shader->ir) || progress;
 170          progress = do_tree_grafting(shader->ir) || progress;
 171          progress = do_constant_propagation(shader->ir) || progress;
 172          progress = do_constant_variable_unlinked(shader->ir) || progress;
 173          progress = do_constant_folding(shader->ir) || progress;
 174          progress = do_algebraic(shader->ir) || progress;
 175          progress = do_vec_index_to_swizzle(shader->ir) || progress;
 176          progress = do_vec_index_to_cond_assign(shader->ir) || progress;
 177          progress = do_swizzle_swizzle(shader->ir) || progress;
 178
 179          loop_state *ls = analyze_loop_variables(shader->ir);
 180          set_loop_controls(shader->ir, ls);
 181          delete ls;
 182       } while (progress);
 183
 184       validate_ir_tree(shader->ir);
 185    }
 186
 187
 188    /* Print out the resulting IR */
 189    if (!state->error && dump_lir) {
 190       _mesa_print_ir(shader->ir, state);
 191    }
 192
 193    shader->symbols = state->symbols;
 194    shader->CompileStatus = !state->error;
 195    shader->Version = state->language_version;
 196    memcpy(shader->builtins_to_link, state->builtins_to_link,
 197           sizeof(shader->builtins_to_link[0]) * state->num_builtins_to_link);
 198    shader->num_builtins_to_link = state->num_builtins_to_link;
 199
 200    if (shader->InfoLog)
 201       talloc_free(shader->InfoLog);
 202
 203    shader->InfoLog = state->info_log;
 204
 205    /* Retain any live IR, but trash the rest. */
 206    reparent_ir(shader->ir, shader);
 207
 208    talloc_free(state);
 209
 210    return;
 211 }
 212
 213 int
 214 main(int argc, char **argv)
 215 {
 216    int status = EXIT_SUCCESS;
 217    GLcontext local_ctx;
 218    GLcontext *ctx = &local_ctx;
 219
 220    ctx->Driver.NewShader = _mesa_new_shader;
 221
 222    int c;
 223    int idx = 0;
 224    while ((c = getopt_long(argc, argv, "", compiler_opts, &idx)) != -1)
 225       /* empty */ ;
 226
 227
 228    if (argc <= optind)
 229       usage_fail(argv[0]);
 230
 231    struct gl_shader_program *whole_program;
 232
 233    whole_program = talloc_zero (NULL, struct gl_shader_program);
 234    assert(whole_program != NULL);
 235
 236    for (/* empty */; argc > optind; optind++) {
 237       whole_program->Shaders = (struct gl_shader **)
 238          talloc_realloc(whole_program, whole_program->Shaders,
 239                         struct gl_shader *, whole_program->NumShaders + 1);
 240       assert(whole_program->Shaders != NULL);
 241
 242       struct gl_shader *shader = talloc_zero(whole_program, gl_shader);
 243
 244       whole_program->Shaders[whole_program->NumShaders] = shader;
 245       whole_program->NumShaders++;
 246
 247       const unsigned len = strlen(argv[optind]);
 248       if (len < 6)
 249          usage_fail(argv[0]);
 250
 251       const char *const ext = & argv[optind][len - 5];
 252       if (strncmp(".vert", ext, 5) == 0)
 253          shader->Type = GL_VERTEX_SHADER;
 254       else if (strncmp(".geom", ext, 5) == 0)
 255          shader->Type = GL_GEOMETRY_SHADER;
 256       else if (strncmp(".frag", ext, 5) == 0)
 257          shader->Type = GL_FRAGMENT_SHADER;
 258       else
 259          usage_fail(argv[0]);
 260
 261       shader->Source = load_text_file(whole_program, argv[optind]);
 262       if (shader->Source == NULL) {
 263          printf("File \"%s\" does not exist.\n", argv[optind]);
 264          exit(EXIT_FAILURE);
 265       }
 266
 267       compile_shader(shader);
 268
 269       if (!shader->CompileStatus) {
 270          printf("Info log for %s:\n%s\n", argv[optind], shader->InfoLog);
 271          status = EXIT_FAILURE;
 272          break;
 273       }
 274    }
 275
 276    if ((status == EXIT_SUCCESS) && do_link)  {
 277       link_shaders(ctx, whole_program);
 278       status = (whole_program->LinkStatus) ? EXIT_SUCCESS : EXIT_FAILURE;
 279
 280       if (strlen(whole_program->InfoLog) > 0)
 281          printf("Info log for linking:\n%s\n", whole_program->InfoLog);
 282    }
 283
 284    for (unsigned i = 0; i < whole_program->_NumLinkedShaders; i++)
 285       talloc_free(whole_program->_LinkedShaders[i]);
 286
 287    talloc_free(whole_program);
 288    _mesa_glsl_release_types();
 289    _mesa_glsl_release_functions();
 290
 291    return status;
 292 }