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-rw-r--r--src/mesa/shader/slang/slang_label.c77
-rw-r--r--src/mesa/shader/slang/slang_label.h42
2 files changed, 119 insertions, 0 deletions
diff --git a/src/mesa/shader/slang/slang_label.c b/src/mesa/shader/slang/slang_label.c
new file mode 100644
index 0000000000..4d35d2e72a
--- /dev/null
+++ b/src/mesa/shader/slang/slang_label.c
@@ -0,0 +1,77 @@
+
+
+/**
+ * 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"
+
+
+slang_label *
+_slang_label_new(const char *name)
+{
+ slang_label *l = (slang_label *) _mesa_calloc(sizeof(slang_label));
+ if (l) {
+ l->Name = _mesa_strdup(name);
+ l->Location = -1;
+ }
+ return l;
+}
+
+void
+_slang_label_delete(slang_label *l)
+{
+ if (l->Name)
+ _mesa_free(l->Name);
+ if (l->References)
+ _mesa_free(l->References);
+ _mesa_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 = _mesa_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) {
+ _mesa_free(l->References);
+ l->References = NULL;
+ }
+}
diff --git a/src/mesa/shader/slang/slang_label.h b/src/mesa/shader/slang/slang_label.h
new file mode 100644
index 0000000000..661624f173
--- /dev/null
+++ b/src/mesa/shader/slang/slang_label.h
@@ -0,0 +1,42 @@
+#ifndef SLANG_LABEL_H
+#define SLANG_LABEL_H 1
+
+#include "imports.h"
+#include "mtypes.h"
+#include "prog_instruction.h"
+
+
+struct slang_label_
+{
+ char *Name;
+ GLint Location;
+ /**
+ * List of instruction references (numbered starting at zero) which need
+ * their BranchTarget field filled in with the location eventually
+ * assigned to the label.
+ */
+ GLuint NumReferences;
+ GLuint *References; /** Array [NumReferences] */
+};
+
+typedef struct slang_label_ slang_label;
+
+
+extern slang_label *
+_slang_label_new(const char *name);
+
+extern void
+_slang_label_delete(slang_label *l);
+
+extern void
+_slang_label_add_reference(slang_label *l, GLuint inst);
+
+extern GLint
+_slang_label_get_location(const slang_label *l);
+
+extern void
+_slang_label_set_location(slang_label *l, GLint location,
+ struct gl_program *prog);
+
+
+#endif /* SLANG_LABEL_H */