debug: Introduce VREND_DEBUG_ENABLED flag

VREND_DEBUG_ENABLED represents if debugging features are enabled and is
controlled by NDEBUG macro. By using VREND_DEBUG_ENABLED in
an if statement instead of using NDEBUG in ifdef, the compiler can
validate the content of the conditional and know its variable usage to
avoid meaningless warnings.

Signed-off-by: Akihiko Odaki <akihiko.odaki@gmail.com>
Part-of: <https://gitlab.freedesktop.org/virgl/virglrenderer/-/merge_requests/715>

src/vrend_debug.h

@@ -79,31 +79,30 @@ static inline void vrend_printf(const char *fmt, ...)
    va_end(va);
 }
 
-#ifndef NDEBUG
+#ifdef NDEBUG
+#define VREND_DEBUG_ENABLED (false)
+#else
+#define VREND_DEBUG_ENABLED (true)
+#endif
+
 #define VREND_DEBUG(flag, ctx,  ...) \
-   if (vrend_debug(ctx, flag)) \
+   if (VREND_DEBUG_ENABLED && vrend_debug(ctx, flag)) \
       do { \
             vrend_print_context_name(ctx); \
             vrend_printf(__VA_ARGS__); \
       } while (0)
 
 #define VREND_DEBUG_EXT(flag, ctx, X) \
-   if (vrend_debug(ctx, flag)) \
+   if (VREND_DEBUG_ENABLED && vrend_debug(ctx, flag)) \
       do { \
             vrend_print_context_name(ctx); \
             X; \
       } while (0)
 
 #define VREND_DEBUG_NOCTX(flag, ctx, ...) \
-   if (vrend_debug(ctx, flag)) \
+   if (VREND_DEBUG_ENABLED && vrend_debug(ctx, flag)) \
       do { \
             vrend_printf(__VA_ARGS__); \
       } while (0)
 
-#else
-#define VREND_DEBUG(flag, ctx, ...) (void)ctx
-#define VREND_DEBUG_EXT(flag, ctx, X) (void)ctx
-#define VREND_DEBUG_NOCTX(flag, ctx, ...) (void)ctx
-#endif
-
 #endif

src/vrend_decode.c

@@ -1711,10 +1711,7 @@ static int vrend_decode_ctx_submit_cmd(struct virgl_context *ctx,
    uint32_t buf_offset = 0;
 
    while (buf_offset < buf_total) {
-#ifndef NDEBUG
       const uint32_t cur_offset = buf_offset;
-#endif
-
       const uint32_t *buf = &typed_buf[buf_offset];
       uint32_t len = *buf >> 16;
       uint32_t cmd = *buf & 0xff;

src/vrend_renderer.c

@@ -3864,11 +3864,9 @@ int vrend_create_shader(struct vrend_context *ctx,
          free(tokens);
          ret = EINVAL;
          goto error;
-      } else {
-#ifdef NDEBUG
-            free(sel->tmp_buf);
-            sel->tmp_buf = NULL;
-#endif
+      } else if (!VREND_DEBUG_ENABLED) {
+         free(sel->tmp_buf);
+         sel->tmp_buf = NULL;
       }
       free(tokens);
       sub_ctx->long_shader_in_progress_handle[type] = 0;
@@ -6489,9 +6487,9 @@ int vrend_renderer_init(const struct vrend_if_cbs *cbs, uint32_t flags)
          vrend_state.max_texture_3d_size =
          vrend_state.max_texture_cube_size = 16384;
 
-#ifndef NDEBUG
-   vrend_init_debug_flags();
-#endif
+   if (VREND_DEBUG_ENABLED) {
+      vrend_init_debug_flags();
+   }
 
    ctx_params.shared = false;
    for (uint32_t i = 0; i < ARRAY_SIZE(gl_versions); i++) {