Fix #6544: Properly format nested type names in extensions (#6769)

* Fix #6544: Properly format nested type names in extensions

Modify DeclRefBase::toText to properly handle types defined
in extensions by qualifying them with their parent type name.
This ensures getFullName() returns the full name like
'FullPrecisionOptimizer<half>.State' instead of just '.State'.
Also handle other nested types in structs/classes similarly.

* Update extension reflection handling - with generics args and namespaces

- stopping namespace inclusion for extension members
- Update to use getTargetType() to handle the generic arguments
- update test cases

* Simplify code to remove using parentDecl

1 files changed, 41 insertions, 0 deletions

diff --git a/tests/diagnostics/extension-full-name.slang.expected b/tests/diagnostics/extension-full-name.slang.expected
new file mode 100644
index 000000000..8001298c1
--- /dev/null
+++ b/tests/diagnostics/extension-full-name.slang.expected
@@ -0,0 +1,41 @@
+result code = -1
+standard error = {
+tests/diagnostics/extension-full-name.slang(184): error 30019: expected an expression of type 'GenericType<half>.State', got 'int'
+    state1 = 0;    // Error: expected expr of type 'GenericType<half>.State', got 'int'
+             ^
+tests/diagnostics/extension-full-name.slang(185): error 30019: expected an expression of type 'GenericType<float>.InnerType.Options', got 'int'
+    options1 = 0;  // Error: expected expr of type 'GenericType<float>.InnerType.Options', got 'int'
+               ^
+tests/diagnostics/extension-full-name.slang(186): error 30019: expected an expression of type 'NonGenericType.Config', got 'int'
+    config1 = 0;   // Error: expected expr of type 'NonGenericType.Config', got 'int'
+              ^
+tests/diagnostics/extension-full-name.slang(187): error 30019: expected an expression of type 'Container.Nested.Settings', got 'int'
+    settings1 = 0; // Error: expected expr of type 'Container.Nested.Settings', got 'int'
+                ^
+tests/diagnostics/extension-full-name.slang(188): error 30019: expected an expression of type 'Container.Nested.DeepNested.Record', got 'int'
+    record1 = 0;   // Error: expected expr of type 'Container.Nested.DeepNested.Record', got 'int'
+              ^
+tests/diagnostics/extension-full-name.slang(196): error 30027: 'getOptions' is not a member of 'GenericType<int>.InnerType'.
+        intInner.getOptions(); // This won't compile as intInner doesn't have getOptions
+                 ^~~~~~~~~~
+tests/diagnostics/extension-full-name.slang(226): error 30019: expected an expression of type 'GenericType<float>.InnerType.Options', got 'GenericType<half>.State'
+            .createState(); // Error: expected expr of type 'GenericType<float>.InnerType.Options',
+                        ^
+tests/diagnostics/extension-full-name.slang(228): error 30019: expected an expression of type 'GenericType<half>.State', got 'NonGenericType.Config'
+    state1 = nonGenType.createConfig(); // Error: expected expr of type 'GenericType<half>.State',
+                                    ^
+tests/diagnostics/extension-full-name.slang(230): error 30019: expected an expression of type 'NonGenericType.Config', got 'Container.Nested.Settings'
+    config1 = nested.createSettings();  // Error: expected expr of type 'NonGenericType.Config', got
+                                   ^
+tests/diagnostics/extension-full-name.slang(304): error 30019: expected an expression of type 'Bar[3].DataStats', got 'int'
+    barStats = 0; // Error: expected expr of type 'Bar[3].DataStats', got 'int'
+               ^
+tests/diagnostics/extension-full-name.slang(312): error 30019: expected an expression of type 'Bar[2].DataStats', got 'Bar[3].DataStats'
+    bar2Stats = barArray.computeStats(); // Error: expected expr of type 'Bar[2].DataStats', got 'Bar[3].DataStats'
+                                     ^
+tests/diagnostics/extension-full-name.slang(355): error 30019: expected an expression of type 'SimpleBase.NamedConfig', got 'int'
+    config = 0; // Error: expected expr of type 'SimpleBase.NamedConfig', got 'int'
+             ^
+}
+standard output = {
+}