From f45c7cbc7c721fe09aa95850011e82a433a94641 Mon Sep 17 00:00:00 2001
From: Martin Boye Petersen <martinboyepetersen@hotmail.com>
Date: Wed, 1 Jul 2026 17:57:01 +0200
Subject: [PATCH 1/3] Suppression file name cache.

Implement a file name cache per suppression to avoid calling PathMatch::match
again and again for the same suppression and file name combination.
---
 lib/suppressions.cpp | 17 ++++++++++++++++-
 lib/suppressions.h   |  6 ++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/lib/suppressions.cpp b/lib/suppressions.cpp
index fe483e347fe..10b17ec8995 100644
--- a/lib/suppressions.cpp
+++ b/lib/suppressions.cpp
@@ -420,7 +420,7 @@ SuppressionList::Suppression::Result SuppressionList::Suppression::isSuppressed(
             if (!thisAndNextLine || lineNumber + 1 != errmsg.lineNumber)
                 return Result::None;
         }
-        if (!fileName.empty() && !PathMatch::match(fileName, errmsg.getFileName()))
+        if (!fileName.empty() && !isFileNameMatch(errmsg.getFileName()))
             return Result::None;
         if (hash > 0 && hash != errmsg.hash)
             return Result::Checked;
@@ -453,6 +453,21 @@ SuppressionList::Suppression::Result SuppressionList::Suppression::isSuppressed(
     return Result::Matched;
 }
 
+bool SuppressionList::Suppression::isFileNameMatch(const std::string &errorFileName) const
+{
+    const auto it = mFileNameMatchCache.find(errorFileName);
+    if (it != mFileNameMatchCache.end())
+        return it->second;
+
+    const bool isMatch = PathMatch::match(fileName, errorFileName);
+
+    if (mFileNameMatchCache.size() >= FileNameMatchCacheMaxEntries)
+        mFileNameMatchCache.clear();
+
+    mFileNameMatchCache.emplace(errorFileName, isMatch);
+    return isMatch;
+}
+
 bool SuppressionList::Suppression::isMatch(const SuppressionList::ErrorMessage &errmsg)
 {
     switch (isSuppressed(errmsg)) {
diff --git a/lib/suppressions.h b/lib/suppressions.h
index 849c972d0a7..dbd9bb2af87 100644
--- a/lib/suppressions.h
+++ b/lib/suppressions.h
@@ -168,6 +168,12 @@ class CPPCHECKLIB SuppressionList {
         bool isPolyspace{};
 
         enum : std::int8_t { NO_LINE = -1 };
+
+    private:
+        bool isFileNameMatch(const std::string &errorFileName) const;
+
+        static constexpr std::size_t FileNameMatchCacheMaxEntries = 256;
+        mutable std::map<std::string, bool> mFileNameMatchCache;
     };
 
     /**

From 1e97436bdf0a5756f1460abc1c3c28bc52bcde39 Mon Sep 17 00:00:00 2001
From: Martin Boye Petersen <martinboyepetersen@hotmail.com>
Date: Wed, 1 Jul 2026 21:24:51 +0200
Subject: [PATCH 2/3] Fix naming violation of private member variable.

---
 lib/suppressions.cpp | 2 +-
 lib/suppressions.h   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/suppressions.cpp b/lib/suppressions.cpp
index 10b17ec8995..76768457ad5 100644
--- a/lib/suppressions.cpp
+++ b/lib/suppressions.cpp
@@ -461,7 +461,7 @@ bool SuppressionList::Suppression::isFileNameMatch(const std::string &errorFileN
 
     const bool isMatch = PathMatch::match(fileName, errorFileName);
 
-    if (mFileNameMatchCache.size() >= FileNameMatchCacheMaxEntries)
+    if (mFileNameMatchCache.size() >= mFileNameMatchCacheMaxEntries)
         mFileNameMatchCache.clear();
 
     mFileNameMatchCache.emplace(errorFileName, isMatch);
diff --git a/lib/suppressions.h b/lib/suppressions.h
index dbd9bb2af87..ef5f9c4e405 100644
--- a/lib/suppressions.h
+++ b/lib/suppressions.h
@@ -172,7 +172,7 @@ class CPPCHECKLIB SuppressionList {
     private:
         bool isFileNameMatch(const std::string &errorFileName) const;
 
-        static constexpr std::size_t FileNameMatchCacheMaxEntries = 256;
+        static constexpr std::size_t mFileNameMatchCacheMaxEntries = 256;
         mutable std::map<std::string, bool> mFileNameMatchCache;
     };
 

From 3693c19bab0e7dab274d99e2d345fd8fea4764f5 Mon Sep 17 00:00:00 2001
From: Martin Boye Petersen <martinboyepetersen@hotmail.com>
Date: Thu, 2 Jul 2026 00:52:28 +0200
Subject: [PATCH 3/3] Rename local variable to avoid conflict with function
 name [shadowFunction].

---
 lib/suppressions.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/suppressions.cpp b/lib/suppressions.cpp
index 76768457ad5..50b13bc9c4c 100644
--- a/lib/suppressions.cpp
+++ b/lib/suppressions.cpp
@@ -459,13 +459,13 @@ bool SuppressionList::Suppression::isFileNameMatch(const std::string &errorFileN
     if (it != mFileNameMatchCache.end())
         return it->second;
 
-    const bool isMatch = PathMatch::match(fileName, errorFileName);
+    const bool result = PathMatch::match(fileName, errorFileName);
 
     if (mFileNameMatchCache.size() >= mFileNameMatchCacheMaxEntries)
         mFileNameMatchCache.clear();
 
-    mFileNameMatchCache.emplace(errorFileName, isMatch);
-    return isMatch;
+    mFileNameMatchCache.emplace(errorFileName, result);
+    return result;
 }
 
 bool SuppressionList::Suppression::isMatch(const SuppressionList::ErrorMessage &errmsg)