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
  39 extern "C" struct gl_shader *
  40 _mesa_new_shader(GLcontext *ctx, GLuint name, GLenum type);
  41
  42 /* Copied from shader_api.c for the stand-alone compiler.
  43  */
  44 struct gl_shader *
  45 _mesa_new_shader(GLcontext *ctx, GLuint name, GLenum type)
  46 {
  47    struct gl_shader *shader;
  48
  49    (void) ctx;
  50
  51    assert(type == GL_FRAGMENT_SHADER || type == GL_VERTEX_SHADER);
  52    shader = talloc_zero(NULL, struct gl_shader);
  53    if (shader) {
  54       shader->Type = type;
  55       shader->Name = name;
  56       shader->RefCount = 1;
  57    }
  58    return shader;
  59 }
  60
  61 /* Returned string will have 'ctx' as its talloc owner. */
  62 static char *
  63 load_text_file(void *ctx, const char *file_name)
  64 {
  65         char *text = NULL;
  66         struct stat st;
  67         ssize_t total_read = 0;
  68         int fd = open(file_name, O_RDONLY);
  69
  70         if (fd < 0) {
  71                 return NULL;
  72         }
  73
  74         if (fstat(fd, & st) == 0) {
  75            text = (char *) talloc_size(ctx, st.st_size + 1);
  76                 if (text != NULL) {
  77                         do {
  78                                 ssize_t bytes = read(fd, text + total_read,
  79                                                      st.st_size - total_read);
  80                                 if (bytes < 0) {
  81                                         free(text);
  82                                         text = NULL;
  83                                         break;
  84                                 }
  85
  86                                 if (bytes == 0) {
  87                                         break;
  88                                 }
  89
  90                                 total_read += bytes;
  91                         } while (total_read < st.st_size);
  92
  93                         text[total_read] = '\0';
  94                 }
  95         }
  96
  97         close(fd);
  98
  99         return text;
 100 }
 101
 102
 103 void
 104 usage_fail(const char *name)
 105 {
 106       printf("%s <filename.frag|filename.vert>\n", name);
 107       exit(EXIT_FAILURE);
 108 }
 109
 110
 111 int dump_ast = 0;
 112 int dump_hir = 0;
 113 int dump_lir = 0;
 114 int do_link = 0;
 115
 116 const struct option compiler_opts[] = {
 117    { "dump-ast", 0, &dump_ast, 1 },
 118    { "dump-hir", 0, &dump_hir, 1 },
 119    { "dump-lir", 0, &dump_lir, 1 },
 120    { "link",     0, &do_link,  1 },
 121    { NULL, 0, NULL, 0 }
 122 };
 123
 124 void
 125 compile_shader(struct gl_shader *shader)
 126 {
 127    struct _mesa_glsl_parse_state *state =
 128       new(shader) _mesa_glsl_parse_state(NULL, shader->Type, shader);
 129
 130    const char *source = shader->Source;
 131    state->error = preprocess(state, &source, &state->info_log,
 132                              state->extensions);
 133
 134    if (!state->error) {
 135       _mesa_glsl_lexer_ctor(state, source);
 136       _mesa_glsl_parse(state);
 137       _mesa_glsl_lexer_dtor(state);
 138    }
 139
 140    if (dump_ast) {
 141       foreach_list_const(n, &state->translation_unit) {
 142          ast_node *ast = exec_node_data(ast_node, n, link);
 143          ast->print();
 144       }
 145       printf("\n\n");
 146    }
 147
 148    shader->ir = new(shader) exec_list;
 149    if (!state->error && !state->translation_unit.is_empty())
 150       _mesa_ast_to_hir(shader->ir, state);
 151
 152    /* Print out the unoptimized IR. */
 153    if (!state->error && dump_hir) {
 154       validate_ir_tree(shader->ir);
 155       _mesa_print_ir(shader->ir, state);
 156    }
 157
 158    /* Optimization passes */
 159    if (!state->error && !shader->ir->is_empty()) {
 160       bool progress;
 161       do {
 162          progress = false;
 163
 164          progress = do_function_inlining(shader->ir) || progress;
 165          progress = do_if_simplification(shader->ir) || progress;
 166          progress = do_copy_propagation(shader->ir) || progress;
 167          progress = do_dead_code_local(shader->ir) || progress;
 168          progress = do_dead_code_unlinked(shader->ir) || progress;
 169          progress = do_tree_grafting(shader->ir) || progress;
 170          progress = do_constant_propagation(shader->ir) || progress;
 171          progress = do_constant_variable_unlinked(shader->ir) || progress;
 172          progress = do_constant_folding(shader->ir) || progress;
 173          progress = do_algebraic(shader->ir) || progress;
 174          progress = do_vec_index_to_swizzle(shader->ir) || progress;
 175          progress = do_vec_index_to_cond_assign(shader->ir) || progress;
 176          progress = do_swizzle_swizzle(shader->ir) || progress;
 177       } while (progress);
 178
 179       validate_ir_tree(shader->ir);
 180    }
 181
 182
 183    /* Print out the resulting IR */
 184    if (!state->error && dump_lir) {
 185       _mesa_print_ir(shader->ir, state);
 186    }
 187
 188    shader->symbols = state->symbols;
 189    shader->CompileStatus = !state->error;
 190    shader->Version = state->language_version;
 191    memcpy(shader->builtins_to_link, state->builtins_to_link,
 192           sizeof(shader->builtins_to_link[0]) * state->num_builtins_to_link);
 193    shader->num_builtins_to_link = state->num_builtins_to_link;
 194
 195    if (shader->InfoLog)
 196       talloc_free(shader->InfoLog);
 197
 198    shader->InfoLog = state->info_log;
 199
 200    /* Retain any live IR, but trash the rest. */
 201    reparent_ir(shader->ir, shader);
 202
 203    talloc_free(state);
 204
 205    return;
 206 }
 207
 208 int
 209 main(int argc, char **argv)
 210 {
 211    int status = EXIT_SUCCESS;
 212
 213    int c;
 214    int idx = 0;
 215    while ((c = getopt_long(argc, argv, "", compiler_opts, &idx)) != -1)
 216       /* empty */ ;
 217
 218
 219    if (argc <= optind)
 220       usage_fail(argv[0]);
 221
 222    struct gl_shader_program *whole_program;
 223
 224    whole_program = talloc_zero (NULL, struct gl_shader_program);
 225    assert(whole_program != NULL);
 226
 227    for (/* empty */; argc > optind; optind++) {
 228       whole_program->Shaders = (struct gl_shader **)
 229          talloc_realloc(whole_program, whole_program->Shaders,
 230                         struct gl_shader *, whole_program->NumShaders + 1);
 231       assert(whole_program->Shaders != NULL);
 232
 233       struct gl_shader *shader = talloc_zero(whole_program, gl_shader);
 234
 235       whole_program->Shaders[whole_program->NumShaders] = shader;
 236       whole_program->NumShaders++;
 237
 238       const unsigned len = strlen(argv[optind]);
 239       if (len < 6)
 240          usage_fail(argv[0]);
 241
 242       const char *const ext = & argv[optind][len - 5];
 243       if (strncmp(".vert", ext, 5) == 0)
 244          shader->Type = GL_VERTEX_SHADER;
 245       else if (strncmp(".geom", ext, 5) == 0)
 246          shader->Type = GL_GEOMETRY_SHADER;
 247       else if (strncmp(".frag", ext, 5) == 0)
 248          shader->Type = GL_FRAGMENT_SHADER;
 249       else
 250          usage_fail(argv[0]);
 251
 252       shader->Source = load_text_file(whole_program, argv[optind]);
 253       if (shader->Source == NULL) {
 254          printf("File \"%s\" does not exist.\n", argv[optind]);
 255          exit(EXIT_FAILURE);
 256       }
 257
 258       compile_shader(shader);
 259
 260       if (!shader->CompileStatus) {
 261          printf("Info log for %s:\n%s\n", argv[optind], shader->InfoLog);
 262          status = EXIT_FAILURE;
 263          break;
 264       }
 265    }
 266
 267    if ((status == EXIT_SUCCESS) && do_link)  {
 268       link_shaders(whole_program);
 269       status = (whole_program->LinkStatus) ? EXIT_SUCCESS : EXIT_FAILURE;
 270
 271       if (strlen(whole_program->InfoLog) > 0)
 272          printf("Info log for linking:\n%s\n", whole_program->InfoLog);
 273    }
 274
 275    for (unsigned i = 0; i < whole_program->_NumLinkedShaders; i++)
 276       talloc_free(whole_program->_LinkedShaders[i]);
 277
 278    talloc_free(whole_program);
 279    _mesa_glsl_release_types();
 280    _mesa_glsl_release_functions();
 281
 282    return status;
 283 }