1 files changed, 202 insertions, 0 deletions
diff --git a/src/mesa/shader/slang/slang_vartable.c b/src/mesa/shader/slang/slang_vartable.c
new file mode 100644
index 0000000000..cd6a081e04
--- /dev/null
+++ b/src/mesa/shader/slang/slang_vartable.c
@@ -0,0 +1,202 @@
+
+#include "imports.h"
+#include "slang_compile.h"
+#include "slang_compile_variable.h"
+#include "slang_vartable.h"
+
+
+static int dbg = 0;
+
+
+typedef enum {
+   FREE,
+   VAR,
+   TEMP
+} TempState;
+
+static int Level = 0;
+
+struct slang_var_table_
+{
+   int level;
+   int num_entries;
+   slang_variable **vars;  /* array [num_entries] */
+
+   TempState temps[MAX_PROGRAM_TEMPS];
+
+   struct slang_var_table_ *parent;
+};
+
+
+
+/**
+ * Create new table, put at head, return ptr to it.
+ */
+slang_var_table *
+_slang_push_var_table(slang_var_table *parent)
+{
+   slang_var_table *t
+      = (slang_var_table *) _mesa_calloc(sizeof(slang_var_table));
+   if (t) {
+      t->level = Level++;
+      t->parent = parent;
+      if (parent) {
+         /* copy the info indicating which temp regs are in use */
+         memcpy(t->temps, parent->temps, sizeof(t->temps));
+      }
+      if (dbg) printf("Pushing level %d\n", t->level);
+   }
+   return t;
+}
+
+
+/**
+ * Destroy given table, return ptr to parent
+ */
+slang_var_table *
+_slang_pop_var_table(slang_var_table *t)
+{
+   slang_var_table *parent = t->parent;
+   int i;
+   if (dbg) printf("Popping level %d\n", t->level);
+   if (t->parent) {
+      for (i = 0; i < MAX_PROGRAM_TEMPS; i++) {
+         if (t->temps[i] && !t->parent->temps[i])
+            if (dbg) printf("  Free reg %d\n", i);
+      }
+   }
+   for (i = 0; i < t->num_entries; i++) {
+      if (dbg) printf("  Free var %s\n", (char*) t->vars[i]->a_name);
+   }
+
+   if (t->vars)
+      free(t->vars);
+   free(t);
+   Level--;
+   return parent;
+}
+
+
+/**
+ * Add a new variable to the given symbol table.
+ */
+void
+_slang_add_variable(slang_var_table *t, slang_variable *v)
+{
+   assert(t);
+   t->vars = realloc(t->vars, (t->num_entries + 1) * sizeof(slang_variable *));
+   t->vars[t->num_entries] = v;
+   t->num_entries++;
+}
+
+
+/**
+ * Look for variable by name in given table.
+ * If not found, parent table will be searched.
+ */
+slang_variable *
+_slang_find_variable(const slang_var_table *t, slang_atom name)
+{
+   while (1) {
+      int i;
+      for (i = 0; i < t->num_entries; i++) {
+         if (t->vars[i]->a_name == name)
+            return t->vars[i];
+      }
+      if (t->parent)
+         t = t->parent;
+      else
+         return NULL;
+   }
+}
+
+
+static GLint
+alloc_reg(slang_var_table *t, GLint size, GLboolean isTemp)
+{
+   const GLuint sz4 = (size + 3) / 4;
+   GLuint i, j;
+   assert(size > 0); /* number of floats */
+
+   for (i = 0; i < MAX_PROGRAM_TEMPS; i++) {
+      GLuint found = 0;
+      for (j = 0; j < sz4; j++) {
+         if (!t->temps[i + j]) {
+            found++;
+         }
+         else {
+            break;
+         }
+      }
+      if (found == sz4) {
+         /* found block of size/4 free regs */
+         for (j = 0; j < sz4; j++)
+            t->temps[i + j] = isTemp ? TEMP : VAR;
+         return i;
+      }
+   }
+   return -1;
+}
+
+
+/**
+ * Allocate temp register(s) for storing a variable.
+ */
+GLint
+_slang_alloc_var(slang_var_table *t, GLint size)
+{
+   int i = alloc_reg(t, size, GL_FALSE);
+   if (dbg) printf("Alloc var %d (level %d)\n", i, t->level);
+   return i;
+}
+
+
+void
+_slang_reserve_var(slang_var_table *t, GLint r, GLint size)
+{
+   const GLint sz4 = (size + 3) / 4;
+   GLint i;
+   for (i = 0; i < sz4; i++) {
+      t->temps[r + i] = VAR;
+   }
+}
+
+
+/**
+ * Allocate temp register(s) for storing an unnamed intermediate value.
+ */
+GLint
+_slang_alloc_temp(slang_var_table *t, GLint size)
+{
+   int i = alloc_reg(t, size, GL_TRUE);
+   if (dbg) printf("Alloc temp %d (level %d)\n", i, t->level);
+   return i;
+}
+
+
+void
+_slang_free_temp(slang_var_table *t, GLint r, GLint size)
+{
+   const GLuint sz4 = (size + 3) / 4;
+   GLuint i;
+   assert(size > 0);
+   assert(r >= 0);
+   assert(r < MAX_PROGRAM_TEMPS);
+   if (dbg) printf("Free temp %d (level %d)\n", r, t->level);
+   for (i = 0; i < sz4; i++) {
+      assert(t->temps[r + i] == TEMP);
+      t->temps[r + i] = FREE;
+   }
+}
+
+
+GLboolean
+_slang_is_temp(slang_var_table *t, GLint r)
+{
+   assert(r >= 0);
+   assert(r < MAX_PROGRAM_TEMPS);
+   if (t->temps[r] == TEMP)
+      return GL_TRUE;
+   else
+      return GL_FALSE;
+}