macho: correctly lower slices incl reloc and rebase tracking

Match changes required to `Elf` linker, which enable lowering
of const slices on `MachO` targets.

Expand `Mir` instructions requiring the knowledge of the containing
atom - pass the symbol index into the linker's table from codegen
via mir to emitter, to then utilise it in the linker.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/link/Plan9.zig b/src/link/Plan9.zig
index ee7272ca8d..4eaa6ed26b 100644
--- a/src/link/Plan9.zig
+++ b/src/link/Plan9.zig
@@ -302,7 +302,9 @@ pub fn updateDecl(self: *Plan9, module: *Module, decl: *Module.Decl) !void {
     var code_buffer = std.ArrayList(u8).init(self.base.allocator);
     defer code_buffer.deinit();
     const decl_val = if (decl.val.castTag(.variable)) |payload| payload.data.init else decl.val;
-    const res = try codegen.generateSymbol(&self.base, @intCast(u32, decl.link.plan9.sym_index.?), decl.srcLoc(), .{
+    // TODO we need the symbol index for symbol in the table of locals for the containing atom
+    const sym_index = decl.link.plan9.sym_index orelse 0;
+    const res = try codegen.generateSymbol(&self.base, @intCast(u32, sym_index), decl.srcLoc(), .{
         .ty = decl.ty,
         .val = decl_val,
     }, &code_buffer, .{ .none = .{} });