From 8f037db88552b5171807d4a9f8be6e8942aab8a1 Mon Sep 17 00:00:00 2001
From: Veikka Tuominen <git@vexu.eu>
Date: Mon, 7 Mar 2022 20:41:48 +0200
Subject: stage2: correct constness of allocs

---
 src/Sema.zig | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'src/Sema.zig')

diff --git a/src/Sema.zig b/src/Sema.zig
index e5e3d6e9b9..d74385dbc1 100644
--- a/src/Sema.zig
+++ b/src/Sema.zig
@@ -607,6 +607,7 @@ fn analyzeBodyInner(
             .alloc_inferred_comptime_mut  => try sema.zirAllocInferredComptime(inst, Type.initTag(.inferred_alloc_mut)),
             .alloc_mut                    => try sema.zirAllocMut(block, inst),
             .alloc_comptime_mut           => try sema.zirAllocComptime(block, inst),
+            .make_ptr_const               => try sema.zirMakePtrConst(block, inst),
             .anyframe_type                => try sema.zirAnyframeType(block, inst),
             .array_cat                    => try sema.zirArrayCat(block, inst),
             .array_mul                    => try sema.zirArrayMul(block, inst),
@@ -2409,6 +2410,21 @@ fn zirAllocComptime(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileErr
     return sema.analyzeComptimeAlloc(block, var_ty, 0, ty_src);
 }
 
+fn zirMakePtrConst(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!Air.Inst.Ref {
+    const inst_data = sema.code.instructions.items(.data)[inst].un_node;
+    const ptr = sema.resolveInst(inst_data.operand);
+    const ptr_ty = sema.typeOf(ptr);
+    var ptr_info = ptr_ty.ptrInfo().data;
+    ptr_info.mutable = false;
+    const const_ptr_ty = try Type.ptr(sema.arena, sema.mod.getTarget(), ptr_info);
+
+    if (try sema.resolveMaybeUndefVal(block, inst_data.src(), ptr)) |val| {
+        return sema.addConstant(const_ptr_ty, val);
+    }
+    try sema.requireRuntimeBlock(block, inst_data.src());
+    return block.addBitCast(const_ptr_ty, ptr);
+}
+
 fn zirAllocInferredComptime(
     sema: *Sema,
     inst: Zir.Inst.Index,
-- 
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