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-rw-r--r--src/glsl/symbol_table.c413
1 files changed, 413 insertions, 0 deletions
diff --git a/src/glsl/symbol_table.c b/src/glsl/symbol_table.c
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+++ b/src/glsl/symbol_table.c
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+/*
+ * Copyright © 2008 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 "main/imports.h"
+#include "symbol_table.h"
+#include "hash_table.h"
+
+struct symbol {
+ /**
+ * Link to the next symbol in the table with the same name
+ *
+ * The linked list of symbols with the same name is ordered by scope
+ * from inner-most to outer-most.
+ */
+ struct symbol *next_with_same_name;
+
+
+ /**
+ * Link to the next symbol in the table with the same scope
+ *
+ * The linked list of symbols with the same scope is unordered. Symbols
+ * in this list my have unique names.
+ */
+ struct symbol *next_with_same_scope;
+
+
+ /**
+ * Header information for the list of symbols with the same name.
+ */
+ struct symbol_header *hdr;
+
+
+ /**
+ * Name space of the symbol
+ *
+ * Name space are arbitrary user assigned integers. No two symbols can
+ * exist in the same name space at the same scope level.
+ */
+ int name_space;
+
+
+ /**
+ * Arbitrary user supplied data.
+ */
+ void *data;
+
+ /** Scope depth where this symbol was defined. */
+ unsigned depth;
+};
+
+
+/**
+ */
+struct symbol_header {
+ /** Linkage in list of all headers in a given symbol table. */
+ struct symbol_header *next;
+
+ /** Symbol name. */
+ const char *name;
+
+ /** Linked list of symbols with the same name. */
+ struct symbol *symbols;
+};
+
+
+/**
+ * Element of the scope stack.
+ */
+struct scope_level {
+ /** Link to next (inner) scope level. */
+ struct scope_level *next;
+
+ /** Linked list of symbols with the same scope. */
+ struct symbol *symbols;
+};
+
+
+/**
+ *
+ */
+struct _mesa_symbol_table {
+ /** Hash table containing all symbols in the symbol table. */
+ struct hash_table *ht;
+
+ /** Top of scope stack. */
+ struct scope_level *current_scope;
+
+ /** List of all symbol headers in the table. */
+ struct symbol_header *hdr;
+
+ /** Current scope depth. */
+ unsigned depth;
+};
+
+
+struct _mesa_symbol_table_iterator {
+ /**
+ * Name space of symbols returned by this iterator.
+ */
+ int name_space;
+
+
+ /**
+ * Currently iterated symbol
+ *
+ * The next call to \c _mesa_symbol_table_iterator_get will return this
+ * value. It will also update this value to the value that should be
+ * returned by the next call.
+ */
+ struct symbol *curr;
+};
+
+
+static void
+check_symbol_table(struct _mesa_symbol_table *table)
+{
+#if 1
+ struct scope_level *scope;
+
+ for (scope = table->current_scope; scope != NULL; scope = scope->next) {
+ struct symbol *sym;
+
+ for (sym = scope->symbols
+ ; sym != NULL
+ ; sym = sym->next_with_same_name) {
+ const struct symbol_header *const hdr = sym->hdr;
+ struct symbol *sym2;
+
+ for (sym2 = hdr->symbols
+ ; sym2 != NULL
+ ; sym2 = sym2->next_with_same_name) {
+ assert(sym2->hdr == hdr);
+ }
+ }
+ }
+#endif
+}
+
+void
+_mesa_symbol_table_pop_scope(struct _mesa_symbol_table *table)
+{
+ struct scope_level *const scope = table->current_scope;
+ struct symbol *sym = scope->symbols;
+
+ table->current_scope = scope->next;
+ table->depth--;
+
+ free(scope);
+
+ while (sym != NULL) {
+ struct symbol *const next = sym->next_with_same_scope;
+ struct symbol_header *const hdr = sym->hdr;
+
+ assert(hdr->symbols == sym);
+
+ hdr->symbols = sym->next_with_same_name;
+
+ free(sym);
+
+ sym = next;
+ }
+
+ check_symbol_table(table);
+}
+
+
+void
+_mesa_symbol_table_push_scope(struct _mesa_symbol_table *table)
+{
+ struct scope_level *const scope = calloc(1, sizeof(*scope));
+
+ scope->next = table->current_scope;
+ table->current_scope = scope;
+ table->depth++;
+}
+
+
+static struct symbol_header *
+find_symbol(struct _mesa_symbol_table *table, const char *name)
+{
+ return (struct symbol_header *) hash_table_find(table->ht, name);
+}
+
+
+struct _mesa_symbol_table_iterator *
+_mesa_symbol_table_iterator_ctor(struct _mesa_symbol_table *table,
+ int name_space, const char *name)
+{
+ struct _mesa_symbol_table_iterator *iter = calloc(1, sizeof(*iter));
+ struct symbol_header *const hdr = find_symbol(table, name);
+
+ iter->name_space = name_space;
+
+ if (hdr != NULL) {
+ struct symbol *sym;
+
+ for (sym = hdr->symbols; sym != NULL; sym = sym->next_with_same_name) {
+ assert(sym->hdr == hdr);
+
+ if ((name_space == -1) || (sym->name_space == name_space)) {
+ iter->curr = sym;
+ break;
+ }
+ }
+ }
+
+ return iter;
+}
+
+
+void
+_mesa_symbol_table_iterator_dtor(struct _mesa_symbol_table_iterator *iter)
+{
+ free(iter);
+}
+
+
+void *
+_mesa_symbol_table_iterator_get(struct _mesa_symbol_table_iterator *iter)
+{
+ return (iter->curr == NULL) ? NULL : iter->curr->data;
+}
+
+
+int
+_mesa_symbol_table_iterator_next(struct _mesa_symbol_table_iterator *iter)
+{
+ struct symbol_header *hdr;
+
+ if (iter->curr == NULL) {
+ return 0;
+ }
+
+ hdr = iter->curr->hdr;
+ iter->curr = iter->curr->next_with_same_name;
+
+ while (iter->curr != NULL) {
+ assert(iter->curr->hdr == hdr);
+
+ if ((iter->name_space == -1)
+ || (iter->curr->name_space == iter->name_space)) {
+ return 1;
+ }
+
+ iter->curr = iter->curr->next_with_same_name;
+ }
+
+ return 0;
+}
+
+
+/**
+ * Determine the scope "distance" of a symbol from the current scope
+ *
+ * \return
+ * A non-negative number for the number of scopes between the current scope
+ * and the scope where a symbol was defined. A value of zero means the current
+ * scope. A negative number if the symbol does not exist.
+ */
+int
+_mesa_symbol_table_symbol_scope(struct _mesa_symbol_table *table,
+ int name_space, const char *name)
+{
+ struct symbol_header *const hdr = find_symbol(table, name);
+ struct symbol *sym;
+
+ if (hdr != NULL) {
+ for (sym = hdr->symbols; sym != NULL; sym = sym->next_with_same_name) {
+ assert(sym->hdr == hdr);
+
+ if ((name_space == -1) || (sym->name_space == name_space)) {
+ assert(sym->depth <= table->depth);
+ return sym->depth - table->depth;
+ }
+ }
+ }
+
+ return -1;
+}
+
+
+void *
+_mesa_symbol_table_find_symbol(struct _mesa_symbol_table *table,
+ int name_space, const char *name)
+{
+ struct symbol_header *const hdr = find_symbol(table, name);
+
+ if (hdr != NULL) {
+ struct symbol *sym;
+
+
+ for (sym = hdr->symbols; sym != NULL; sym = sym->next_with_same_name) {
+ assert(sym->hdr == hdr);
+
+ if ((name_space == -1) || (sym->name_space == name_space)) {
+ return sym->data;
+ }
+ }
+ }
+
+ return NULL;
+}
+
+
+int
+_mesa_symbol_table_add_symbol(struct _mesa_symbol_table *table,
+ int name_space, const char *name,
+ void *declaration)
+{
+ struct symbol_header *hdr;
+ struct symbol *sym;
+
+ check_symbol_table(table);
+
+ hdr = find_symbol(table, name);
+
+ check_symbol_table(table);
+
+ if (hdr == NULL) {
+ hdr = calloc(1, sizeof(*hdr));
+ hdr->name = name;
+
+ hash_table_insert(table->ht, hdr, name);
+ hdr->next = table->hdr;
+ table->hdr = hdr;
+ }
+
+ check_symbol_table(table);
+
+ /* If the symbol already exists in this namespace at this scope, it cannot
+ * be added to the table.
+ */
+ for (sym = hdr->symbols
+ ; (sym != NULL) && (sym->name_space != name_space)
+ ; sym = sym->next_with_same_name) {
+ /* empty */
+ }
+
+ if (sym && (sym->depth == table->depth))
+ return -1;
+
+ sym = calloc(1, sizeof(*sym));
+ sym->next_with_same_name = hdr->symbols;
+ sym->next_with_same_scope = table->current_scope->symbols;
+ sym->hdr = hdr;
+ sym->name_space = name_space;
+ sym->data = declaration;
+ sym->depth = table->depth;
+
+ assert(sym->hdr == hdr);
+
+ hdr->symbols = sym;
+ table->current_scope->symbols = sym;
+
+ check_symbol_table(table);
+ return 0;
+}
+
+
+struct _mesa_symbol_table *
+_mesa_symbol_table_ctor(void)
+{
+ struct _mesa_symbol_table *table = calloc(1, sizeof(*table));
+
+ if (table != NULL) {
+ table->ht = hash_table_ctor(32, hash_table_string_hash,
+ hash_table_string_compare);
+
+ _mesa_symbol_table_push_scope(table);
+ }
+
+ return table;
+}
+
+
+void
+_mesa_symbol_table_dtor(struct _mesa_symbol_table *table)
+{
+ struct symbol_header *hdr;
+ struct symbol_header *next;
+
+ while (table->current_scope != NULL) {
+ _mesa_symbol_table_pop_scope(table);
+ }
+
+ for (hdr = table->hdr; hdr != NULL; hdr = next) {
+ next = hdr->next;
+ _mesa_free(hdr);
+ }
+
+ hash_table_dtor(table->ht);
+ free(table);
+}
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