From 35a8e8a06c0cb0a5a0c6ddcca3b70be05dc4d035 Mon Sep 17 00:00:00 2001
From: Emile Badenhorst <MyvarHD@gmail.com>
Date: Sat, 1 Jul 2023 16:43:17 +0200
Subject: [PATCH] Fixed Autodoc rendering of @truncate builtin (#16263)

* fixed autodoc rendering of @trucate builtin

* Changed to LHS for typeRef

* autodoc: fix typeref for `truncate`

---------

Co-authored-by: Loris Cro <kappaloris@gmail.com>
---
 lib/docs/main.js |  4 +++-
 src/Autodoc.zig  | 36 +++++++++++++++++++++++++++++++++++-
 2 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/lib/docs/main.js b/lib/docs/main.js
index 168a9b3a6c..b43a289e48 100644
--- a/lib/docs/main.js
+++ b/lib/docs/main.js
@@ -1419,6 +1419,9 @@ const NAV_MODES = {
           case "bit_reverse": {
             return "@bitReverse(T" + ", " + param + ")";
           }
+          case "truncate": {
+            return "@truncate(" + param + ")";
+          }
           default:
             console.log("builtin function not handled yet or doesn't exist!");
         }
@@ -2622,7 +2625,6 @@ const NAV_MODES = {
 
   function renderValue(decl) {
     let resolvedValue = resolveValue(decl.value);
-
     if (resolvedValue.expr.fieldRef) {
       const declRef = decl.value.expr.refPath[0].declRef;
       const type = getDecl(declRef);
diff --git a/src/Autodoc.zig b/src/Autodoc.zig
index ad90ae4c14..60c266e887 100644
--- a/src/Autodoc.zig
+++ b/src/Autodoc.zig
@@ -1601,7 +1601,42 @@ fn walkInstruction(
                 .expr = .{ .builtinIndex = bin_index },
             };
         },
+        .truncate => {
+            // in the ZIR this node is a builtin `bin` but we want send it as a `un` builtin
+            const pl_node = data[inst_index].pl_node;
+            const extra = file.zir.extraData(Zir.Inst.Bin, pl_node.payload_index);
 
+            var rhs: DocData.WalkResult = try self.walkRef(
+                file,
+                parent_scope,
+                parent_src,
+                extra.data.rhs,
+                false,
+            );
+
+            const bin_index = self.exprs.items.len;
+            try self.exprs.append(self.arena, .{ .builtin = .{ .param = 0 } });
+
+            const rhs_index = self.exprs.items.len;
+            try self.exprs.append(self.arena, rhs.expr);
+
+            var lhs: DocData.WalkResult = try self.walkRef(
+                file,
+                parent_scope,
+                parent_src,
+                extra.data.lhs,
+                false,
+            );
+
+            self.exprs.items[bin_index] = .{ .builtin = .{ .name = @tagName(tags[inst_index]), .param = rhs_index } };
+
+            std.debug.print("lhs: {any}\n\n", .{lhs});
+            std.debug.print("lhs typeref: {any}\n\n", .{lhs.typeRef});
+            return DocData.WalkResult{
+                .typeRef = lhs.expr,
+                .expr = .{ .builtinIndex = bin_index },
+            };
+        },
         .int_from_float,
         .float_from_int,
         .ptr_from_int,
@@ -1609,7 +1644,6 @@ fn walkInstruction(
         .float_cast,
         .int_cast,
         .ptr_cast,
-        .truncate,
         .has_decl,
         .has_field,
         .div_exact,