[Fix] Fix frame scope error in T.macro (#1308)

* [Fix] Fix #1307 by adding macro inside function

* fix lint error

* add comments and fix lint error

* Remove debug print from enter_frame method

Removed debug print statement from enter_frame method.

---------
Co-authored-by: Lei Wang <34334180+LeiWang1999@users.noreply.github.com>

testing/python/language/test_tilelang_language_frontend_v2.py

@@ -427,5 +427,31 @@ def test_var_macro():
         pass
 
 
+def frame_inside_macro():
+
+    @tilelang.jit
+    def get_sample_kernel():
+
+        @T.macro
+        def transform(x):
+            return x + 1
+
+        @T.prim_func
+        def sample_kernel(
+            num_blocks: T.int32,
+            idx_out: T.Tensor[(32,), T.int32],
+        ):
+            with T.Kernel(num_blocks, threads=32) as block_idx:  # noqa: F841
+                fragment = T.alloc_fragment(32, 'int32')
+                T.copy(idx_out, fragment)
+
+                for i in T.Parallel(32):
+                    idx_out[i] = transform(fragment[i])
+
+        return sample_kernel
+
+    kernel = get_sample_kernel()  # noqa: F841
+
+
 if __name__ == '__main__':
     tilelang.testing.main()

tilelang/language/v2/builder.py

@@ -80,6 +80,10 @@ class MacroFrame(Frame):
     ...
 
 
+class ExitedMacroFrame(Frame):
+    ...
+
+
 class BoolOpFrame(Frame):
     ...
 
@@ -164,8 +168,22 @@ class Builder(BaseBuilder):
         save = self.name_inside_frame, self.arg_annotations
         self.name_inside_frame = {}
         self.arg_annotations = annotations or {}
-        with self.with_frame(MacroFrame()):
+        pos = len(self.frames)
+        # here we add a ExitedMacroFrame to preserve the frame stack inside macro
+        # because macro may bind some variable, and return it
+        #
+        # ```py
+        # @T.macro
+        # def foo(x):
+        #    y = x + 1
+        #    return y
+        # @T.prim_func
+        # def bar():
+        #    c = foo(1) # macro generates let y = x + 1
+        #    d = c # d = c should lay inside frame of `let y = x + 1`
+        self.frames.append(MacroFrame())
         yield
+        self.frames[pos] = ExitedMacroFrame()
         self.name_inside_frame, self.arg_annotations = save
 
     def get(self):