diff options
Diffstat (limited to 'src/glsl/pp/sl_pp_define.c')
| -rw-r--r-- | src/glsl/pp/sl_pp_define.c | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/src/glsl/pp/sl_pp_define.c b/src/glsl/pp/sl_pp_define.c new file mode 100644 index 00000000000..808a6a0d4f1 --- /dev/null +++ b/src/glsl/pp/sl_pp_define.c @@ -0,0 +1,238 @@ +/************************************************************************** + * + * Copyright 2009 VMware, Inc. + * All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sub license, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial portions + * of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. + * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR + * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, + * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE + * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + * + **************************************************************************/ + +#include <stdlib.h> +#include <string.h> +#include "sl_pp_context.h" +#include "sl_pp_process.h" +#include "sl_pp_public.h" + + +static void +skip_whitespace(const struct sl_pp_token_info *input, + unsigned int *first, + unsigned int last) +{ + while (*first < last && input[*first].token == SL_PP_WHITESPACE) { + (*first)++; + } +} + + +static int +_parse_formal_args(struct sl_pp_context *context, + const struct sl_pp_token_info *input, + unsigned int *first, + unsigned int last, + struct sl_pp_macro *macro) +{ + struct sl_pp_macro_formal_arg **arg; + + macro->num_args = 0; + + skip_whitespace(input, first, last); + if (*first < last) { + if (input[*first].token == SL_PP_RPAREN) { + (*first)++; + return 0; + } + } else { + strcpy(context->error_msg, "expected either macro formal argument or `)'"); + return -1; + } + + arg = ¯o->arg; + + for (;;) { + if (*first < last && input[*first].token != SL_PP_IDENTIFIER) { + strcpy(context->error_msg, "expected macro formal argument"); + return -1; + } + + *arg = malloc(sizeof(struct sl_pp_macro_formal_arg)); + if (!*arg) { + strcpy(context->error_msg, "out of memory"); + return -1; + } + + (**arg).name = input[*first].data.identifier; + (*first)++; + + (**arg).next = NULL; + arg = &(**arg).next; + + macro->num_args++; + + skip_whitespace(input, first, last); + if (*first < last) { + if (input[*first].token == SL_PP_COMMA) { + (*first)++; + skip_whitespace(input, first, last); + } else if (input[*first].token == SL_PP_RPAREN) { + (*first)++; + return 0; + } else { + strcpy(context->error_msg, "expected either `,' or `)'"); + return -1; + } + } else { + strcpy(context->error_msg, "expected either `,' or `)'"); + return -1; + } + } + + /* Should not gete here. */ +} + + +int +sl_pp_process_define(struct sl_pp_context *context, + const struct sl_pp_token_info *input, + unsigned int first, + unsigned int last) +{ + int macro_name = -1; + struct sl_pp_macro *macro; + unsigned int i; + unsigned int body_len; + unsigned int j; + + if (first < last && input[first].token == SL_PP_IDENTIFIER) { + macro_name = input[first].data.identifier; + first++; + } + if (macro_name == -1) { + strcpy(context->error_msg, "expected macro name"); + return -1; + } + + /* Check for reserved macro names */ + { + const char *name = sl_pp_context_cstr(context, macro_name); + + if (strstr(name, "__")) { + strcpy(context->error_msg, "macro names containing `__' are reserved"); + return 1; + } + if (name[0] == 'G' && name[1] == 'L' && name[2] == '_') { + strcpy(context->error_msg, "macro names prefixed with `GL_' are reserved"); + return 1; + } + } + + for (macro = context->macro; macro; macro = macro->next) { + if (macro->name == macro_name) { + break; + } + } + + if (!macro) { + macro = sl_pp_macro_new(); + if (!macro) { + strcpy(context->error_msg, "out of memory"); + return -1; + } + + *context->macro_tail = macro; + context->macro_tail = ¯o->next; + } else { + sl_pp_macro_reset(macro); + } + + macro->name = macro_name; + + /* + * If there is no whitespace between macro name and left paren, a macro + * formal argument list follows. This is the only place where the presence + * of a whitespace matters and it's the only reason why we are dealing + * with whitespace at this level. + */ + if (first < last && input[first].token == SL_PP_LPAREN) { + first++; + if (_parse_formal_args(context, input, &first, last, macro)) { + return -1; + } + } + + /* Calculate body size, trim out whitespace, make room for EOF. */ + body_len = 1; + for (i = first; i < last; i++) { + if (input[i].token != SL_PP_WHITESPACE) { + body_len++; + } + } + + macro->body = malloc(sizeof(struct sl_pp_token_info) * body_len); + if (!macro->body) { + strcpy(context->error_msg, "out of memory"); + return -1; + } + + for (j = 0, i = first; i < last; i++) { + if (input[i].token != SL_PP_WHITESPACE) { + macro->body[j++] = input[i]; + } + } + macro->body[j++].token = SL_PP_EOF; + + return 0; +} + + +int +sl_pp_process_undef(struct sl_pp_context *context, + const struct sl_pp_token_info *input, + unsigned int first, + unsigned int last) +{ + int macro_name = -1; + struct sl_pp_macro **pmacro; + struct sl_pp_macro *macro; + + if (first < last && input[first].token == SL_PP_IDENTIFIER) { + macro_name = input[first].data.identifier; + } + if (macro_name == -1) { + return 0; + } + + for (pmacro = &context->macro; *pmacro; pmacro = &(**pmacro).next) { + if ((**pmacro).name == macro_name) { + break; + } + } + if (!*pmacro) { + return 0; + } + + macro = *pmacro; + *pmacro = macro->next; + macro->next = NULL; + sl_pp_macro_free(macro); + + return 0; +} |