stage2: un-tangle memory management of Decl and Namespace

Before there was this "top_decl" and "tmp_namespace" stack values that
were kludgy and buggy. Now Sema is slightly reworked so that files which
are structs are analyzed with their own Decl and Namespace already set
up.

After this commit there are no memory leaks for a successful build-obj.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/value.zig b/src/value.zig
index d2d7be3007..04608878c0 100644
--- a/src/value.zig
+++ b/src/value.zig
@@ -593,6 +593,14 @@ pub const Value = extern union {
         unreachable;
     }
 
+    /// Returns null if not a type or if the type has no namespace.
+    pub fn getTypeNamespace(self: Value) ?*Module.Scope.Namespace {
+        return switch (self.tag()) {
+            .ty => self.castTag(.ty).?.data.getNamespace(),
+            else => null,
+        };
+    }
+
     /// Asserts that the value is representable as a type.
     pub fn toType(self: Value, allocator: *Allocator) !Type {
         return switch (self.tag()) {