wasm: Fix unreachable paths

When the last instruction is a debug instruction, the type of it is void.
Similarly for 'noreturn' emit an 'unreachable' instruction to tell the wasm-validator
the path cannot be reached.

Also respect the '--strip' flag in the self-hosted wasm linker and not emit a 'name' section
when the flag is set to `true`.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/arch/wasm/CodeGen.zig b/src/arch/wasm/CodeGen.zig
index b701299e73..6cec3f4a87 100644
--- a/src/arch/wasm/CodeGen.zig
+++ b/src/arch/wasm/CodeGen.zig
@@ -871,7 +871,8 @@ fn genFunc(self: *Self) InnerError!void {
     // we emit an unreachable instruction to tell the stack validator that part will never be reached.
     if (func_type.returns.len != 0 and self.air.instructions.len > 0) {
         const inst = @intCast(u32, self.air.instructions.len - 1);
-        if (self.air.typeOfIndex(inst).isNoReturn()) {
+        const last_inst_ty = self.air.typeOfIndex(inst);
+        if (!last_inst_ty.hasRuntimeBitsIgnoreComptime() or last_inst_ty.isNoReturn()) {
             try self.addTag(.@"unreachable");
         }
     }