diff options
Diffstat (limited to 'mesalib/src/glsl/glcpp/pp.c')
| -rw-r--r-- | mesalib/src/glsl/glcpp/pp.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/mesalib/src/glsl/glcpp/pp.c b/mesalib/src/glsl/glcpp/pp.c new file mode 100644 index 000000000..e1a3a88a3 --- /dev/null +++ b/mesalib/src/glsl/glcpp/pp.c @@ -0,0 +1,167 @@ +/* + * Copyright © 2010 Intel Corporation + * + * 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, sublicense, + * 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 NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS 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 <assert.h> +#include <string.h> +#include <ctype.h> +#include "glcpp.h" +#include "main/core.h" /* for isblank() on MSVC */ + +void +glcpp_error (YYLTYPE *locp, glcpp_parser_t *parser, const char *fmt, ...) +{ + va_list ap; + + parser->error = 1; + parser->info_log = talloc_asprintf_append(parser->info_log, + "%u:%u(%u): " + "preprocessor error: ", + locp->source, + locp->first_line, + locp->first_column); + va_start(ap, fmt); + parser->info_log = talloc_vasprintf_append(parser->info_log, fmt, ap); + va_end(ap); + parser->info_log = talloc_strdup_append(parser->info_log, "\n"); +} + +void +glcpp_warning (YYLTYPE *locp, glcpp_parser_t *parser, const char *fmt, ...) +{ + va_list ap; + + parser->info_log = talloc_asprintf_append(parser->info_log, + "%u:%u(%u): " + "preprocessor warning: ", + locp->source, + locp->first_line, + locp->first_column); + va_start(ap, fmt); + parser->info_log = talloc_vasprintf_append(parser->info_log, fmt, ap); + va_end(ap); + parser->info_log = talloc_strdup_append(parser->info_log, "\n"); +} + +/* Searches backwards for '^ *#' from a given starting point. */ +static int +in_directive(const char *shader, const char *ptr) +{ + assert(ptr >= shader); + + /* Search backwards for '#'. If we find a \n first, it doesn't count */ + for (; ptr >= shader && *ptr != '#'; ptr--) { + if (*ptr == '\n') + return 0; + } + if (ptr >= shader) { + /* Found '#'...look for spaces preceded by a newline */ + for (ptr--; ptr >= shader && isblank(*ptr); ptr--); + // FIXME: I don't think the '\n' case can happen + if (ptr < shader || *ptr == '\n') + return 1; + } + return 0; +} + +/* Remove any line continuation characters in preprocessing directives. + * However, ignore any in GLSL code, as "There is no line continuation + * character" (1.30 page 9) in GLSL. + */ +static char * +remove_line_continuations(glcpp_parser_t *ctx, const char *shader) +{ + int in_continued_line = 0; + int extra_newlines = 0; + char *clean = talloc_strdup(ctx, ""); + const char *search_start = shader; + const char *newline; + while ((newline = strchr(search_start, '\n')) != NULL) { + const char *backslash = NULL; + + /* # of characters preceding the newline. */ + int n = newline - shader; + + /* Find the preceding '\', if it exists */ + if (n >= 1 && newline[-1] == '\\') + backslash = newline - 1; + else if (n >= 2 && newline[-1] == '\r' && newline[-2] == '\\') + backslash = newline - 2; + + /* Double backslashes don't count (the backslash is escaped) */ + if (backslash != NULL && backslash[-1] == '\\') { + backslash = NULL; + } + + if (backslash != NULL) { + /* We found a line continuation, but do we care? */ + if (!in_continued_line) { + if (in_directive(shader, backslash)) { + in_continued_line = 1; + extra_newlines = 0; + } + } + if (in_continued_line) { + /* Copy everything before the \ */ + clean = talloc_strndup_append(clean, shader, backslash - shader); + shader = newline + 1; + extra_newlines++; + } + } else if (in_continued_line) { + /* Copy everything up to and including the \n */ + clean = talloc_strndup_append(clean, shader, newline - shader + 1); + shader = newline + 1; + /* Output extra newlines to make line numbers match */ + for (; extra_newlines > 0; extra_newlines--) + clean = talloc_strdup_append(clean, "\n"); + in_continued_line = 0; + } + search_start = newline + 1; + } + clean = talloc_strdup_append(clean, shader); + return clean; +} + +int +preprocess(void *talloc_ctx, const char **shader, char **info_log, + const struct gl_extensions *extensions, int api) +{ + int errors; + glcpp_parser_t *parser = glcpp_parser_create (extensions, api); + *shader = remove_line_continuations(parser, *shader); + + glcpp_lex_set_source_string (parser, *shader); + + glcpp_parser_parse (parser); + + if (parser->skip_stack) + glcpp_error (&parser->skip_stack->loc, parser, "Unterminated #if\n"); + + *info_log = talloc_strdup_append(*info_log, parser->info_log); + + talloc_steal(talloc_ctx, parser->output); + *shader = parser->output; + + errors = parser->error; + glcpp_parser_destroy (parser); + return errors; +} |