From 05da5b32a820c031001098034840940964f41a81 Mon Sep 17 00:00:00 2001
From: Isaac Freund <mail@isaacfreund.com>
Date: Mon, 20 Feb 2023 23:31:48 +0100
Subject: Sema: implement @fieldParentPtr for unions

---
 src/codegen/c.zig    | 6 ++++++
 src/codegen/llvm.zig | 4 ++--
 2 files changed, 8 insertions(+), 2 deletions(-)

(limited to 'src/codegen')

diff --git a/src/codegen/c.zig b/src/codegen/c.zig
index 0beb00b236..399549da3a 100644
--- a/src/codegen/c.zig
+++ b/src/codegen/c.zig
@@ -5367,12 +5367,18 @@ fn airFieldParentPtr(f: *Function, inst: Air.Inst.Index) !CValue {
     }
 
     const struct_ptr_ty = f.air.typeOfIndex(inst);
+
     const field_ptr_ty = f.air.typeOf(extra.field_ptr);
     const field_ptr_val = try f.resolveInst(extra.field_ptr);
     try reap(f, inst, &.{extra.field_ptr});
 
     const target = f.object.dg.module.getTarget();
     const struct_ty = struct_ptr_ty.childType();
+
+    if (struct_ty.zigTypeTag() == .Union) {
+        return f.fail("TODO: CBE: @fieldParentPtr for unions", .{});
+    }
+
     const field_offset = struct_ty.structFieldOffset(extra.field_index, target);
 
     var field_offset_pl = Value.Payload.I64{
diff --git a/src/codegen/llvm.zig b/src/codegen/llvm.zig
index aa794827a8..558556f108 100644
--- a/src/codegen/llvm.zig
+++ b/src/codegen/llvm.zig
@@ -6020,8 +6020,8 @@ pub const FuncGen = struct {
         const field_ptr = try self.resolveInst(extra.field_ptr);
 
         const target = self.dg.module.getTarget();
-        const struct_ty = self.air.getRefType(ty_pl.ty).childType();
-        const field_offset = struct_ty.structFieldOffset(extra.field_index, target);
+        const parent_ty = self.air.getRefType(ty_pl.ty).childType();
+        const field_offset = parent_ty.structFieldOffset(extra.field_index, target);
 
         const res_ty = try self.dg.lowerType(self.air.getRefType(ty_pl.ty));
         if (field_offset == 0) {
-- 
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