1 files changed, 104 insertions, 0 deletions
diff --git a/src/mesa/slang/slang_label.c b/src/mesa/slang/slang_label.c
new file mode 100644
index 0000000000..8e3a8ebc1a
--- /dev/null
+++ b/src/mesa/slang/slang_label.c
@@ -0,0 +1,104 @@
+
+
+/**
+ * Functions for managing instruction labels.
+ * Basically, this is used to manage the problem of forward branches where
+ * we have a branch instruciton but don't know the target address yet.
+ */
+
+
+#include "slang_label.h"
+#include "slang_mem.h"
+
+
+
+slang_label *
+_slang_label_new(const char *name)
+{
+   slang_label *l = (slang_label *) _slang_alloc(sizeof(slang_label));
+   if (l) {
+      l->Name = _slang_strdup(name);
+      l->Location = -1;
+   }
+   return l;
+}
+
+/**
+ * As above, but suffix the name with a unique number.
+ */
+slang_label *
+_slang_label_new_unique(const char *name)
+{
+   static int id = 1;
+   slang_label *l = (slang_label *) _slang_alloc(sizeof(slang_label));
+   if (l) {
+      l->Name = (char *) _slang_alloc(strlen(name) + 10);
+      if (!l->Name) {
+         free(l);
+         return NULL;
+      }
+      _mesa_snprintf(l->Name, strlen(name) + 10, "%s_%d", name, id);
+      id++;
+      l->Location = -1;
+   }
+   return l;
+}
+
+void
+_slang_label_delete(slang_label *l)
+{
+   if (l->Name) {
+      _slang_free(l->Name);
+      l->Name = NULL;
+   }
+   if (l->References) {
+      _slang_free(l->References);
+      l->References = NULL;
+   }
+   _slang_free(l);
+}
+
+
+void
+_slang_label_add_reference(slang_label *l, GLuint inst)
+{
+   const GLuint oldSize = l->NumReferences * sizeof(GLuint);
+   assert(l->Location < 0);
+   l->References = _slang_realloc(l->References,
+                                  oldSize, oldSize + sizeof(GLuint));
+   if (l->References) {
+      l->References[l->NumReferences] = inst;
+      l->NumReferences++;
+   }
+}
+
+
+GLint
+_slang_label_get_location(const slang_label *l)
+{
+   return l->Location;
+}
+
+
+void
+_slang_label_set_location(slang_label *l, GLint location,
+                          struct gl_program *prog)
+{
+   GLuint i;
+
+   assert(l->Location < 0);
+   assert(location >= 0);
+
+   l->Location = location;
+
+   /* for the instructions that were waiting to learn the label's location: */
+   for (i = 0; i < l->NumReferences; i++) {
+      const GLuint j = l->References[i];
+      prog->Instructions[j].BranchTarget = location;
+   }
+
+   if (l->References) {
+      _slang_free(l->References);
+      l->References = NULL;
+   }
+}