nir: check NIR_SKIP to skip passes by name

Passes' function names, separated by comma, listed in NIR_SKIP
environment variable will be skipped in debug mode.  The mechanism is
hooked into the _PASS macro, like NIR_PRINT.

The extra macro NIR_SKIP is available as a developer convenience, to
skip at pointer other than the passes entry points.

v2: Fix typo in NIR_SKIP macro. (Bas)

Reviewed-by: Alejandro Piñeiro <[email protected]>
Reviewed-by: Bas Nieuwenhuizen <[email protected]>

2 files changed, 16 insertions, 0 deletions

diff --git a/src/util/debug.c b/src/util/debug.c
index 2773b55cc4d..09de1a8bbe5 100644
--- a/src/util/debug.c
+++ b/src/util/debug.c
@@ -53,6 +53,20 @@ parse_debug_string(const char *debug,
    return flag;
 }
 
+bool
+comma_separated_list_contains(const char *list, const char *s)
+{
+   assert(list);
+   const size_t len = strlen(s);
+
+   for (unsigned n; n = strcspn(list, ","), *list; list += MAX2(1, n)) {
+      if (n == len && !strncmp(list, s, n))
+         return true;
+   }
+
+   return false;
+}
+
 /**
  * Reads an environment variable and interprets its value as a boolean.
  *
diff --git a/src/util/debug.h b/src/util/debug.h
index 2e34ebe3421..bbcc1975545 100644
--- a/src/util/debug.h
+++ b/src/util/debug.h
@@ -40,6 +40,8 @@ uint64_t
 parse_debug_string(const char *debug,
                    const struct debug_control *control);
 bool
+comma_separated_list_contains(const char *list, const char *s);
+bool
 env_var_as_boolean(const char *var_name, bool default_value);
 unsigned
 env_var_as_unsigned(const char *var_name, unsigned default_value);