From 2c5924c59a148335e5025b72a5ba98d765ed771d Mon Sep 17 00:00:00 2001
From: dweiller <4678790+dweiller@users.noreplay.github.com>
Date: Tue, 2 May 2023 22:04:15 +1000
Subject: [PATCH] autodoc: fix support for slice_length ZIR instruction

---
 lib/docs/main.js | 19 ++++++++++++++++++-
 src/Autodoc.zig  | 14 +++++++++++++-
 2 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/lib/docs/main.js b/lib/docs/main.js
index 9b650643e9..f803fddb81 100644
--- a/lib/docs/main.js
+++ b/lib/docs/main.js
@@ -1093,6 +1093,23 @@ const NAV_MODES = {
         payloadHtml += decl + "[" + start + ".." + end + sentinel + "]";
         return payloadHtml;
       }
+      case "sliceLength": {
+        let payloadHtml = "";
+        const lhsExpr = zigAnalysis.exprs[expr.sliceLength.lhs];
+        const startExpr = zigAnalysis.exprs[expr.sliceLength.start];
+        const lenExpr = zigAnalysis.exprs[expr.sliceLength.len];
+        let decl = exprName(lhsExpr, opts);
+        let start = exprName(startExpr, opts);
+        let len = exprName(lenExpr, opts);
+        let sentinel = "";
+        if (expr.sliceLength["sentinel"]) {
+            const sentinelExpr = zigAnalysis.exprs[expr.sliceLength.sentinel];
+            let sentinel_ = exprName(sentinelExpr, options);
+            sentinel += " :" + sentinel_;
+        }
+        payloadHtml += decl + "[" + start + "..][0.." + len + sentinel + "]";
+        return payloadHtml;
+      }
       case "sliceIndex": {
         const sliceIndex = zigAnalysis.exprs[expr.sliceIndex];
         return exprName(sliceIndex, opts, opts);
@@ -4850,4 +4867,4 @@ function RadixTree() {
 
 // BUT!
 
-// We want to be able to search "Hash", for example!
\ No newline at end of file
+// We want to be able to search "Hash", for example!
diff --git a/src/Autodoc.zig b/src/Autodoc.zig
index eba53b7e17..1dfe036fd6 100644
--- a/src/Autodoc.zig
+++ b/src/Autodoc.zig
@@ -755,6 +755,7 @@ const DocData = struct {
         string: []const u8, // direct value
         sliceIndex: usize,
         slice: Slice,
+        sliceLength: SliceLength,
         cmpxchgIndex: usize,
         cmpxchg: Cmpxchg,
         builtin: Builtin,
@@ -791,6 +792,12 @@ const DocData = struct {
             end: ?usize = null,
             sentinel: ?usize = null, // index in `exprs`
         };
+        const SliceLength = struct {
+            lhs: usize,
+            start: usize,
+            len: usize,
+            sentinel: ?usize = null,
+        };
         const Cmpxchg = struct {
             name: []const u8,
             type: usize,
@@ -1337,7 +1344,12 @@ fn walkInstruction(
                 try self.exprs.append(self.arena, sentinel.expr);
                 break :sentinel_index index;
             } else null;
-            self.exprs.items[slice_index] = .{ .slice = .{ .lhs = lhs_index, .start = start_index, .end = len_index, .sentinel = sentinel_index } };
+            self.exprs.items[slice_index] = .{ .sliceLength = .{
+                .lhs = lhs_index,
+                .start = start_index,
+                .len = len_index,
+                .sentinel = sentinel_index,
+            } };
 
             return DocData.WalkResult{
                 .typeRef = self.decls.items[lhs.expr.declRef.Analyzed].value.typeRef,