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Diffstat (limited to 'src/glsl/pp/sl_pp_expression.c')
-rw-r--r--src/glsl/pp/sl_pp_expression.c411
1 files changed, 411 insertions, 0 deletions
diff --git a/src/glsl/pp/sl_pp_expression.c b/src/glsl/pp/sl_pp_expression.c
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index 0000000000..ec904787dd
--- /dev/null
+++ b/src/glsl/pp/sl_pp_expression.c
@@ -0,0 +1,411 @@
+/**************************************************************************
+ *
+ * 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_public.h"
+
+
+struct parse_context {
+ struct sl_pp_context *context;
+ const struct sl_pp_token_info *input;
+};
+
+static int
+_parse_or(struct parse_context *ctx,
+ int *result);
+
+static int
+_parse_primary(struct parse_context *ctx,
+ int *result)
+{
+ if (ctx->input->token == SL_PP_UINT) {
+ *result = atoi(sl_pp_context_cstr(ctx->context, ctx->input->data._uint));
+ ctx->input++;
+ } else {
+ if (ctx->input->token != SL_PP_LPAREN) {
+ strcpy(ctx->context->error_msg, "expected `('");
+ return -1;
+ }
+ ctx->input++;
+ if (_parse_or(ctx, result)) {
+ return -1;
+ }
+ if (ctx->input->token != SL_PP_RPAREN) {
+ strcpy(ctx->context->error_msg, "expected `)'");
+ return -1;
+ }
+ ctx->input++;
+ }
+ return 0;
+}
+
+static int
+_parse_unary(struct parse_context *ctx,
+ int *result)
+{
+ if (!_parse_primary(ctx, result)) {
+ return 0;
+ }
+
+ switch (ctx->input->token) {
+ case SL_PP_PLUS:
+ ctx->input++;
+ if (_parse_unary(ctx, result)) {
+ return -1;
+ }
+ *result = +*result;
+ break;
+
+ case SL_PP_MINUS:
+ ctx->input++;
+ if (_parse_unary(ctx, result)) {
+ return -1;
+ }
+ *result = -*result;
+ break;
+
+ case SL_PP_NOT:
+ ctx->input++;
+ if (_parse_unary(ctx, result)) {
+ return -1;
+ }
+ *result = !*result;
+ break;
+
+ case SL_PP_BITNOT:
+ ctx->input++;
+ if (_parse_unary(ctx, result)) {
+ return -1;
+ }
+ *result = ~*result;
+ break;
+
+ default:
+ return -1;
+ }
+
+ return 0;
+}
+
+static int
+_parse_multiplicative(struct parse_context *ctx,
+ int *result)
+{
+ if (_parse_unary(ctx, result)) {
+ return -1;
+ }
+ for (;;) {
+ int right;
+
+ switch (ctx->input->token) {
+ case SL_PP_STAR:
+ ctx->input++;
+ if (_parse_unary(ctx, &right)) {
+ return -1;
+ }
+ *result = *result * right;
+ break;
+
+ case SL_PP_SLASH:
+ ctx->input++;
+ if (_parse_unary(ctx, &right)) {
+ return -1;
+ }
+ *result = *result / right;
+ break;
+
+ case SL_PP_MODULO:
+ ctx->input++;
+ if (_parse_unary(ctx, &right)) {
+ return -1;
+ }
+ *result = *result % right;
+ break;
+
+ default:
+ return 0;
+ }
+ }
+}
+
+static int
+_parse_additive(struct parse_context *ctx,
+ int *result)
+{
+ if (_parse_multiplicative(ctx, result)) {
+ return -1;
+ }
+ for (;;) {
+ int right;
+
+ switch (ctx->input->token) {
+ case SL_PP_PLUS:
+ ctx->input++;
+ if (_parse_multiplicative(ctx, &right)) {
+ return -1;
+ }
+ *result = *result + right;
+ break;
+
+ case SL_PP_MINUS:
+ ctx->input++;
+ if (_parse_multiplicative(ctx, &right)) {
+ return -1;
+ }
+ *result = *result - right;
+ break;
+
+ default:
+ return 0;
+ }
+ }
+}
+
+static int
+_parse_shift(struct parse_context *ctx,
+ int *result)
+{
+ if (_parse_additive(ctx, result)) {
+ return -1;
+ }
+ for (;;) {
+ int right;
+
+ switch (ctx->input->token) {
+ case SL_PP_LSHIFT:
+ ctx->input++;
+ if (_parse_additive(ctx, &right)) {
+ return -1;
+ }
+ *result = *result << right;
+ break;
+
+ case SL_PP_RSHIFT:
+ ctx->input++;
+ if (_parse_additive(ctx, &right)) {
+ return -1;
+ }
+ *result = *result >> right;
+ break;
+
+ default:
+ return 0;
+ }
+ }
+}
+
+static int
+_parse_relational(struct parse_context *ctx,
+ int *result)
+{
+ if (_parse_shift(ctx, result)) {
+ return -1;
+ }
+ for (;;) {
+ int right;
+
+ switch (ctx->input->token) {
+ case SL_PP_LESSEQUAL:
+ ctx->input++;
+ if (_parse_shift(ctx, &right)) {
+ return -1;
+ }
+ *result = *result <= right;
+ break;
+
+ case SL_PP_GREATEREQUAL:
+ ctx->input++;
+ if (_parse_shift(ctx, &right)) {
+ return -1;
+ }
+ *result = *result >= right;
+ break;
+
+ case SL_PP_LESS:
+ ctx->input++;
+ if (_parse_shift(ctx, &right)) {
+ return -1;
+ }
+ *result = *result < right;
+ break;
+
+ case SL_PP_GREATER:
+ ctx->input++;
+ if (_parse_shift(ctx, &right)) {
+ return -1;
+ }
+ *result = *result > right;
+ break;
+
+ default:
+ return 0;
+ }
+ }
+}
+
+static int
+_parse_equality(struct parse_context *ctx,
+ int *result)
+{
+ if (_parse_relational(ctx, result)) {
+ return -1;
+ }
+ for (;;) {
+ int right;
+
+ switch (ctx->input->token) {
+ case SL_PP_EQUAL:
+ ctx->input++;
+ if (_parse_relational(ctx, &right)) {
+ return -1;
+ }
+ *result = *result == right;
+ break;
+
+ case SL_PP_NOTEQUAL:
+ ctx->input++;
+ if (_parse_relational(ctx, &right)) {
+ return -1;
+ }
+ *result = *result != right;
+ break;
+
+ default:
+ return 0;
+ }
+ }
+}
+
+static int
+_parse_bitand(struct parse_context *ctx,
+ int *result)
+{
+ if (_parse_equality(ctx, result)) {
+ return -1;
+ }
+ while (ctx->input->token == SL_PP_BITAND) {
+ int right;
+
+ ctx->input++;
+ if (_parse_equality(ctx, &right)) {
+ return -1;
+ }
+ *result = *result & right;
+ }
+ return 0;
+}
+
+static int
+_parse_xor(struct parse_context *ctx,
+ int *result)
+{
+ if (_parse_bitand(ctx, result)) {
+ return -1;
+ }
+ while (ctx->input->token == SL_PP_XOR) {
+ int right;
+
+ ctx->input++;
+ if (_parse_bitand(ctx, &right)) {
+ return -1;
+ }
+ *result = *result ^ right;
+ }
+ return 0;
+}
+
+static int
+_parse_bitor(struct parse_context *ctx,
+ int *result)
+{
+ if (_parse_xor(ctx, result)) {
+ return -1;
+ }
+ while (ctx->input->token == SL_PP_BITOR) {
+ int right;
+
+ ctx->input++;
+ if (_parse_xor(ctx, &right)) {
+ return -1;
+ }
+ *result = *result | right;
+ }
+ return 0;
+}
+
+static int
+_parse_and(struct parse_context *ctx,
+ int *result)
+{
+ if (_parse_bitor(ctx, result)) {
+ return -1;
+ }
+ while (ctx->input->token == SL_PP_AND) {
+ int right;
+
+ ctx->input++;
+ if (_parse_bitor(ctx, &right)) {
+ return -1;
+ }
+ *result = *result && right;
+ }
+ return 0;
+}
+
+static int
+_parse_or(struct parse_context *ctx,
+ int *result)
+{
+ if (_parse_and(ctx, result)) {
+ return -1;
+ }
+ while (ctx->input->token == SL_PP_OR) {
+ int right;
+
+ ctx->input++;
+ if (_parse_and(ctx, &right)) {
+ return -1;
+ }
+ *result = *result || right;
+ }
+ return 0;
+}
+
+int
+sl_pp_execute_expression(struct sl_pp_context *context,
+ const struct sl_pp_token_info *input,
+ int *result)
+{
+ struct parse_context ctx;
+
+ ctx.context = context;
+ ctx.input = input;
+
+ return _parse_or(&ctx, result);
+}
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