summaryrefslogtreecommitdiffstats
path: root/src/glsl/pp/sl_pp_if.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/glsl/pp/sl_pp_if.c')
-rw-r--r--src/glsl/pp/sl_pp_if.c276
1 files changed, 276 insertions, 0 deletions
diff --git a/src/glsl/pp/sl_pp_if.c b/src/glsl/pp/sl_pp_if.c
new file mode 100644
index 00000000000..e331acc4cd5
--- /dev/null
+++ b/src/glsl/pp/sl_pp_if.c
@@ -0,0 +1,276 @@
+/**************************************************************************
+ *
+ * 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 "sl_pp_expression.h"
+#include "sl_pp_process.h"
+
+
+static int
+_evaluate_if_stack(struct sl_pp_context *context)
+{
+ unsigned int i;
+
+ for (i = context->if_ptr; i < SL_PP_MAX_IF_NESTING; i++) {
+ if (!(context->if_stack[i] & 1)) {
+ return 0;
+ }
+ }
+ return 1;
+}
+
+static int
+_parse_if(struct sl_pp_context *context,
+ const struct sl_pp_token_info *input,
+ unsigned int first,
+ unsigned int last)
+{
+ unsigned int i;
+ struct sl_pp_process_state state;
+ struct sl_pp_token_info eof;
+ int result;
+
+ if (!context->if_ptr) {
+ /* #if nesting too deep. */
+ return -1;
+ }
+
+ memset(&state, 0, sizeof(state));
+ for (i = first; i < last;) {
+ switch (input[i].token) {
+ case SL_PP_WHITESPACE:
+ i++;
+ break;
+
+ case SL_PP_IDENTIFIER:
+ if (sl_pp_macro_expand(context, input, &i, NULL, &state, 0)) {
+ free(state.out);
+ return -1;
+ }
+ break;
+
+ default:
+ if (sl_pp_process_out(&state, &input[i])) {
+ free(state.out);
+ return -1;
+ }
+ i++;
+ }
+ }
+
+ eof.token = SL_PP_EOF;
+ if (sl_pp_process_out(&state, &eof)) {
+ free(state.out);
+ return -1;
+ }
+
+ if (sl_pp_execute_expression(context, state.out, &result)) {
+ free(state.out);
+ return -1;
+ }
+
+ free(state.out);
+
+ context->if_ptr--;
+ context->if_stack[context->if_ptr] = result ? 1 : 0;
+ context->if_value = _evaluate_if_stack(context);
+
+ return 0;
+}
+
+static int
+_parse_else(struct sl_pp_context *context)
+{
+ if (context->if_ptr == SL_PP_MAX_IF_NESTING) {
+ /* No matching #if. */
+ return -1;
+ }
+
+ /* Bit b1 indicates we already went through #else. */
+ if (context->if_stack[context->if_ptr] & 2) {
+ /* No matching #if. */
+ return -1;
+ }
+
+ /* Invert current condition value and mark that we are in the #else block. */
+ context->if_stack[context->if_ptr] = (1 - (context->if_stack[context->if_ptr] & 1)) | 2;
+ context->if_value = _evaluate_if_stack(context);
+
+ return 0;
+}
+
+int
+sl_pp_process_if(struct sl_pp_context *context,
+ const struct sl_pp_token_info *input,
+ unsigned int first,
+ unsigned int last)
+{
+ return _parse_if(context, input, first, last);
+}
+
+int
+sl_pp_process_ifdef(struct sl_pp_context *context,
+ const struct sl_pp_token_info *input,
+ unsigned int first,
+ unsigned int last)
+{
+ unsigned int i;
+
+ if (!context->if_ptr) {
+ /* #if nesting too deep. */
+ return -1;
+ }
+
+ for (i = first; i < last; i++) {
+ switch (input[i].token) {
+ case SL_PP_IDENTIFIER:
+ {
+ struct sl_pp_macro *macro;
+ int macro_name = input[i].data.identifier;
+ int defined = 0;
+
+ for (macro = context->macro; macro; macro = macro->next) {
+ if (macro->name == macro_name) {
+ defined = 1;
+ break;
+ }
+ }
+
+ context->if_ptr--;
+ context->if_stack[context->if_ptr] = defined ? 1 : 0;
+ context->if_value = _evaluate_if_stack(context);
+ }
+ return 0;
+
+ case SL_PP_WHITESPACE:
+ break;
+
+ default:
+ /* Expected an identifier. */
+ return -1;
+ }
+ }
+
+ /* Expected an identifier. */
+ return -1;
+}
+
+int
+sl_pp_process_ifndef(struct sl_pp_context *context,
+ const struct sl_pp_token_info *input,
+ unsigned int first,
+ unsigned int last)
+{
+ unsigned int i;
+
+ if (!context->if_ptr) {
+ /* #if nesting too deep. */
+ return -1;
+ }
+
+ for (i = first; i < last; i++) {
+ switch (input[i].token) {
+ case SL_PP_IDENTIFIER:
+ {
+ struct sl_pp_macro *macro;
+ int macro_name = input[i].data.identifier;
+ int defined = 0;
+
+ for (macro = context->macro; macro; macro = macro->next) {
+ if (macro->name == macro_name) {
+ defined = 1;
+ break;
+ }
+ }
+
+ context->if_ptr--;
+ context->if_stack[context->if_ptr] = defined ? 0 : 1;
+ context->if_value = _evaluate_if_stack(context);
+ }
+ return 0;
+
+ case SL_PP_WHITESPACE:
+ break;
+
+ default:
+ /* Expected an identifier. */
+ return -1;
+ }
+ }
+
+ /* Expected an identifier. */
+ return -1;
+}
+
+int
+sl_pp_process_elif(struct sl_pp_context *context,
+ const struct sl_pp_token_info *input,
+ unsigned int first,
+ unsigned int last)
+{
+ if (_parse_else(context)) {
+ return -1;
+ }
+
+ if (context->if_stack[context->if_ptr] & 1) {
+ context->if_ptr++;
+ if (_parse_if(context, input, first, last)) {
+ return -1;
+ }
+ }
+
+ /* We are still in the #if block. */
+ context->if_stack[context->if_ptr] = context->if_stack[context->if_ptr] & ~2;
+
+ return 0;
+}
+
+int
+sl_pp_process_else(struct sl_pp_context *context,
+ const struct sl_pp_token_info *input,
+ unsigned int first,
+ unsigned int last)
+{
+ return _parse_else(context);
+}
+
+int
+sl_pp_process_endif(struct sl_pp_context *context,
+ const struct sl_pp_token_info *input,
+ unsigned int first,
+ unsigned int last)
+{
+ if (context->if_ptr == SL_PP_MAX_IF_NESTING) {
+ /* No matching #if. */
+ return -1;
+ }
+
+ context->if_ptr++;
+ context->if_value = _evaluate_if_stack(context);
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-13 09:43:26 +0000