[llvm] update_test_checks: keep meta variables stable by default (PR #76748)

[Jannik Silvanus via llvm-commits]

Nicolai =?utf-8?q?Hähnle?= <nicolai.haehnle at amd.com>,
Nicolai =?utf-8?q?Hähnle?= <nicolai.haehnle at amd.com>,
Nicolai =?utf-8?q?Hähnle?= <nicolai.haehnle at amd.com>,
Nicolai =?utf-8?q?Hähnle?= <nicolai.haehnle at amd.com>
Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/76748 at github.com>


================
@@ -1176,20 +1215,236 @@ def may_clash_with_default_check_prefix_name(check_prefix, var):
     )
 
 
+VARIABLE_TAG = "[[@@]]"
+METAVAR_RE = re.compile(r"\[\[([A-Z0-9_]+)(?::[^]]+)?\]\]")
+NUMERIC_SUFFIX_RE = re.compile(r"[0-9]*$")
+
+
+class CheckValueInfo:
+    def __init__(
+        self,
+        nameless_value: NamelessValue,
+        var: str,
+        prefix: str,
+    ):
+        self.nameless_value = nameless_value
+        self.var = var
+        self.prefix = prefix
+
+
+class CheckLineInfo:
----------------
jasilvanus wrote:

Maybe add an explanation how we represent lines and variables: `line` is the line with all variables replaced by `VARIABLE_TAG`, and variables are stored separately. This allows to match lines while ignoring some or all of variable names.

https://github.com/llvm/llvm-project/pull/76748