[Mlir-commits] [llvm] [mlir] Introduce a "log level" support for DEBUG_TYPE (PR #150855)

[Mehdi Amini]

================
@@ -38,25 +40,52 @@
 
 using namespace llvm;
 
+/// Parse a debug type string into a pair of the debug type and the debug level.
+/// The expected format is "type[:level]", where the level is an optional
+/// integer.
+static std::pair<std::string, int> parseDebugType(StringRef DbgType) {
+  int Level = 0;
+  size_t ColonPos = DbgType.find(':');
+  if (ColonPos != StringRef::npos) {
+    StringRef LevelStr = DbgType.substr(ColonPos + 1);
+    DbgType = DbgType.take_front(ColonPos);
+    if (LevelStr.empty())
+      Level = -1;
----------------
joker-eph wrote:

This is providing a "negative filter": that is instead of opting out for specific DEBUG_TYPE you can opt out.

For example running with: 

```
--debug-only=pattern-application:-1
```

Will print everything **but** the `pattern-application` type.

https://github.com/llvm/llvm-project/pull/150855