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-rw-r--r--mesalib/src/glsl/pp/sl_pp_if.c340
1 files changed, 340 insertions, 0 deletions
diff --git a/mesalib/src/glsl/pp/sl_pp_if.c b/mesalib/src/glsl/pp/sl_pp_if.c
new file mode 100644
index 000000000..25cb7a3ca
--- /dev/null
+++ b/mesalib/src/glsl/pp/sl_pp_if.c
@@ -0,0 +1,340 @@
+/**************************************************************************
+ *
+ * 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_expression.h"
+#include "sl_pp_process.h"
+
+
+static int
+_macro_is_defined(struct sl_pp_context *context,
+ int macro_name)
+{
+ unsigned int i;
+ struct sl_pp_macro *macro;
+
+ for (i = 0; i < context->num_extensions; i++) {
+ if (macro_name == context->extensions[i].name) {
+ return 1;
+ }
+ }
+
+ for (macro = context->macro; macro; macro = macro->next) {
+ if (macro_name == macro->name) {
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+static int
+_parse_defined(struct sl_pp_context *context,
+ struct sl_pp_token_buffer *buffer,
+ struct sl_pp_process_state *state)
+{
+ struct sl_pp_token_info input;
+ int parens = 0;
+ int defined;
+ struct sl_pp_token_info result;
+
+ if (sl_pp_token_buffer_skip_white(buffer, &input)) {
+ return -1;
+ }
+
+ if (input.token == SL_PP_LPAREN) {
+ if (sl_pp_token_buffer_skip_white(buffer, &input)) {
+ return -1;
+ }
+ parens = 1;
+ }
+
+ if (input.token != SL_PP_IDENTIFIER) {
+ strcpy(context->error_msg, "expected an identifier");
+ return -1;
+ }
+
+ defined = _macro_is_defined(context, input.data.identifier);
+
+ if (parens) {
+ if (sl_pp_token_buffer_skip_white(buffer, &input)) {
+ return -1;
+ }
+ if (input.token != SL_PP_RPAREN) {
+ strcpy(context->error_msg, "expected `)'");
+ return -1;
+ }
+ }
+
+ result.token = SL_PP_UINT;
+ result.data._uint = (defined ? context->dict._1 : context->dict._0);
+
+ if (sl_pp_process_out(state, &result)) {
+ strcpy(context->error_msg, "out of memory");
+ return -1;
+ }
+
+ return 0;
+}
+
+static unsigned 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].u.condition) {
+ return 0;
+ }
+ }
+ return 1;
+}
+
+static int
+_parse_if(struct sl_pp_context *context,
+ struct sl_pp_token_buffer *buffer)
+{
+ struct sl_pp_process_state state;
+ int found_end = 0;
+ struct sl_pp_token_info eof;
+ int result;
+
+ if (!context->if_ptr) {
+ strcpy(context->error_msg, "`#if' nesting too deep");
+ return -1;
+ }
+
+ memset(&state, 0, sizeof(state));
+ while (!found_end) {
+ struct sl_pp_token_info input;
+
+ sl_pp_token_buffer_get(buffer, &input);
+ switch (input.token) {
+ case SL_PP_WHITESPACE:
+ break;
+
+ case SL_PP_IDENTIFIER:
+ if (input.data.identifier == context->dict.defined) {
+ if (_parse_defined(context, buffer, &state)) {
+ free(state.out);
+ return -1;
+ }
+ } else {
+ sl_pp_token_buffer_unget(buffer, &input);
+ if (sl_pp_macro_expand(context, buffer, NULL, &state, sl_pp_macro_expand_unknown_to_0)) {
+ free(state.out);
+ return -1;
+ }
+ }
+ break;
+
+ case SL_PP_NEWLINE:
+ case SL_PP_EOF:
+ found_end = 1;
+ break;
+
+ default:
+ if (sl_pp_process_out(&state, &input)) {
+ strcpy(context->error_msg, "out of memory");
+ free(state.out);
+ return -1;
+ }
+ }
+ }
+
+ eof.token = SL_PP_EOF;
+ if (sl_pp_process_out(&state, &eof)) {
+ strcpy(context->error_msg, "out of memory");
+ 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].value = 0;
+ context->if_stack[context->if_ptr].u.condition = result ? 1 : 0;
+ context->if_value = _evaluate_if_stack(context);
+
+ return 0;
+}
+
+static int
+_parse_else(struct sl_pp_context *context)
+{
+ union sl_pp_if_state *state = &context->if_stack[context->if_ptr];
+
+ if (context->if_ptr == SL_PP_MAX_IF_NESTING) {
+ strcpy(context->error_msg, "no matching `#if'");
+ return -1;
+ }
+
+ if (state->u.went_thru_else) {
+ strcpy(context->error_msg, "no matching `#if'");
+ return -1;
+ }
+
+ /* Once we had a true condition, the subsequent #elifs should always be false. */
+ state->u.had_true_cond |= state->u.condition;
+
+ /* Update current condition value and mark that we are in the #else block. */
+ state->u.condition = !(state->u.had_true_cond | state->u.condition);
+ state->u.went_thru_else = 1;
+ context->if_value = _evaluate_if_stack(context);
+
+ return 0;
+}
+
+int
+sl_pp_process_if(struct sl_pp_context *context,
+ struct sl_pp_token_buffer *buffer)
+{
+ return _parse_if(context, buffer);
+}
+
+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) {
+ strcpy(context->error_msg, "`#if' nesting too deep");
+ return -1;
+ }
+
+ for (i = first; i < last; i++) {
+ switch (input[i].token) {
+ case SL_PP_IDENTIFIER:
+ context->if_ptr--;
+ context->if_stack[context->if_ptr].value = 0;
+ context->if_stack[context->if_ptr].u.condition = _macro_is_defined(context, input[i].data.identifier);
+ context->if_value = _evaluate_if_stack(context);
+ return 0;
+
+ case SL_PP_WHITESPACE:
+ break;
+
+ default:
+ strcpy(context->error_msg, "expected an identifier");
+ return -1;
+ }
+ }
+
+ strcpy(context->error_msg, "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) {
+ strcpy(context->error_msg, "`#if' nesting too deep");
+ return -1;
+ }
+
+ for (i = first; i < last; i++) {
+ switch (input[i].token) {
+ case SL_PP_IDENTIFIER:
+ context->if_ptr--;
+ context->if_stack[context->if_ptr].value = 0;
+ context->if_stack[context->if_ptr].u.condition = !_macro_is_defined(context, input[i].data.identifier);
+ context->if_value = _evaluate_if_stack(context);
+ return 0;
+
+ case SL_PP_WHITESPACE:
+ break;
+
+ default:
+ strcpy(context->error_msg, "expected an identifier");
+ return -1;
+ }
+ }
+
+ strcpy(context->error_msg, "expected an identifier");
+ return -1;
+}
+
+int
+sl_pp_process_elif(struct sl_pp_context *context,
+ struct sl_pp_token_buffer *buffer)
+{
+ if (_parse_else(context)) {
+ return -1;
+ }
+
+ if (context->if_stack[context->if_ptr].u.condition) {
+ context->if_ptr++;
+ if (_parse_if(context, buffer)) {
+ return -1;
+ }
+ }
+
+ /* We are still in the #if block. */
+ context->if_stack[context->if_ptr].u.went_thru_else = 0;
+
+ 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) {
+ strcpy(context->error_msg, "no matching `#if'");
+ return -1;
+ }
+
+ context->if_ptr++;
+ context->if_value = _evaluate_if_stack(context);
+
+ return 0;
+}
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