fix: fix macro to suppress compilation warning (#231)

There are some mistakes in our macro definitions which results in lots
of warnings and potential bugs.
This PR fixes the issue.

Author: yzh119

python/csrc/pytorch_extension_utils.h

@@ -108,10 +108,10 @@ using namespace flashinfer;
     }                                                                                   \
   }()
 
-#define _DISPATCH_CASE(case_expr, var, ...) \
-  case case_expr: {                         \
-    constexpr auto var = case_expr;         \
-    return __VA_ARGS__();                   \
+#define _DISPATCH_CASE(case_expr, case_var, ...) \
+  case case_expr: {                              \
+    constexpr auto case_var = case_expr;         \
+    return __VA_ARGS__();                        \
   }
 
 #define DISPATCH_group_size(expr, const_expr, ...) \

python/generate_dispatch_inc.py

@@ -27,79 +27,77 @@ def get_dispatch_inc_str(args: argparse.Namespace) -> str:
             for _ in args.head_dims
         ]
     )
-    dispatch_head_dims_str = f"""#define _DISPATCH_CASES_head_dim(...)         \\
+    dispatch_head_dims_str = f"""#define _DISPATCH_CASES_head_dim(const_var, ...)         \\
 {dispatch_head_dims_entries}
 // EOL
 """
     # group sizes
     dispatch_group_sizes_entries = "\n".join(
         [
-            "  _DISPATCH_CASE({}, GROUP_SIZE, __VA_ARGS__) \\".format(_)
+            "  _DISPATCH_CASE({}, case_var, __VA_ARGS__) \\".format(_)
             for _ in args.group_sizes
         ]
     )
-    dispatch_group_sizes_str = f"""#define _DISPATCH_CASES_group_size(...)         \\
+    dispatch_group_sizes_str = f"""#define _DISPATCH_CASES_group_size(case_var, ...)         \\
 {dispatch_group_sizes_entries}
 // EOL
 """
     # page sizes
     dispatch_page_sizes_entries = "\n".join(
         [
-            "  _DISPATCH_CASE({}, PAGE_SIZE, __VA_ARGS__) \\".format(_)
+            "  _DISPATCH_CASE({}, case_var, __VA_ARGS__) \\".format(_)
             for _ in args.page_sizes
         ]
     )
-    dispatch_page_sizes_str = f"""#define _DISPATCH_CASES_page_size(...)         \\
+    dispatch_page_sizes_str = f"""#define _DISPATCH_CASES_page_size(case_var, ...)         \\
 {dispatch_page_sizes_entries}
 // EOL
 """
     # kv layouts
     dispatch_kv_layouts_entries = "\n".join(
         [
-            "  _DISPATCH_CASE({}, KV_LAYOUT, __VA_ARGS__) \\".format(
+            "  _DISPATCH_CASE({}, case_var, __VA_ARGS__) \\".format(
                 kv_layout_literal[_]
             )
             for _ in args.kv_layouts
         ]
     )
-    dispatch_kv_layouts_str = f"""#define _DISPATCH_CASES_kv_layout(...)         \\
+    dispatch_kv_layouts_str = f"""#define _DISPATCH_CASES_kv_layout(case_var, ...)         \\
 {dispatch_kv_layouts_entries}
 // EOL
 """
     # positional encoding modes
     dispatch_pos_encoding_modes_entries = "\n".join(
         [
-            "  _DISPATCH_CASE({}, POS_ENCODING_MODE, __VA_ARGS__) \\".format(
+            "  _DISPATCH_CASE({}, case_var, __VA_ARGS__) \\".format(
                 pos_encoding_mode_literal[_]
             )
             for _ in args.pos_encoding_modes
         ]
     )
-    dispatch_pos_encoding_modes_str = f"""#define _DISPATCH_CASES_pos_encoding_mode(...)         \\
+    dispatch_pos_encoding_modes_str = f"""#define _DISPATCH_CASES_pos_encoding_mode(case_var, ...)         \\
 {dispatch_pos_encoding_modes_entries}
 // EOL
 """
     # allow fp16 qk reductions
     dispatch_allow_fp16_qk_reduction_entries = "\n".join(
         [
-            "  _DISPATCH_CASE({}, ALLOW_FP16_QK_REDUCTION, __VA_ARGS__) \\".format(
-                bool_literal[_]
-            )
+            "  _DISPATCH_CASE({}, case_var, __VA_ARGS__) \\".format(bool_literal[_])
             for _ in args.allow_fp16_qk_reductions
         ]
     )
-    dispatch_allow_fp16_qk_reductions_str = f"""#define _DISPATCH_CASES_allow_fp16_qk_reduction(...)         \\
+    dispatch_allow_fp16_qk_reductions_str = f"""#define _DISPATCH_CASES_allow_fp16_qk_reduction(case_var, ...)         \\
 {dispatch_allow_fp16_qk_reduction_entries}
 // EOL
 """
     # causal
     dispatch_causal_entries = "\n".join(
         [
-            "  _DISPATCH_CASE({}, CAUSAL, __VA_ARGS__) \\".format(bool_literal[_])
+            "  _DISPATCH_CASE({}, case_var, __VA_ARGS__) \\".format(bool_literal[_])
             for _ in args.causals
         ]
     )
-    dispatch_causal_str = f"""#define _DISPATCH_CASES_causal(...)         \\
+    dispatch_causal_str = f"""#define _DISPATCH_CASES_causal(case_var, ...)         \\
 {dispatch_causal_entries}
 // EOL
 """