glsl: Add an origin pointer in the function signature object.

This points to the object with the function body, allowing us to map
from a built-in prototype to the actual body with IR code to execute.

Signed-off-by: Olivier Galibert <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/glsl/ir.h b/src/glsl/ir.h
index fe950861620..92be063747f 100644
--- a/src/glsl/ir.h
+++ b/src/glsl/ir.h
@@ -572,6 +572,9 @@ private:
    /** Function of which this signature is one overload. */
    class ir_function *_function;
 
+   /** Function signature of which this one is a prototype clone */
+   const ir_function_signature *origin;
+
    friend class ir_function;
 };