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-rw-r--r--src/glsl/glcpp/pp.c166
1 files changed, 166 insertions, 0 deletions
diff --git a/src/glsl/glcpp/pp.c b/src/glsl/glcpp/pp.c
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+/*
+ * 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"
+
+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;
+}
+
+extern int
+preprocess(void *talloc_ctx, const char **shader, char **info_log,
+ const struct gl_extensions *extensions)
+{
+ int errors;
+ glcpp_parser_t *parser = glcpp_parser_create (extensions);
+ *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;
+}