Commit cf13356dab

@@ -144,3 +144,4 @@ pub fn extraData(mir: Mir, comptime T: type, index: usize) struct { data: T, end
         .end = i,
     };
 }
+

@@ -58,3 +58,23 @@ pub fn deinit(mir: *Mir, gpa: std.mem.Allocator) void {
     mir.* = undefined;
 }
 
+/// Returns the requested data, as well as the new index which is at the start of the
+/// trailers for the object.
+pub fn extraData(mir: Mir, comptime T: type, index: usize) struct { data: T, end: usize } {
+    const fields = std.meta.fields(T);
+    var i: usize = index;
+    var result: T = undefined;
+    inline for (fields) |field| {
+        @field(result, field.name) = switch (field.field_type) {
+            u32 => mir.extra[i],
+            i32 => @bitCast(i32, mir.extra[i]),
+            else => @compileError("bad field type"),
+        };
+        i += 1;
+    }
+    return .{
+        .data = result,
+        .end = i,
+    };
+}
+