From 17ea101e7bd19556e3b7651210068e20dc8b9fee Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Marjam=C3=A4ki?= <daniel.marjamaki@gmail.com>
Date: Thu, 19 Oct 2023 21:02:03 +0200
Subject: [PATCH] Fix #12081 (Tokenizer::simplifyTypedef: Handle volatile
 structs better) (#5577)

---
 lib/tokenize.cpp             | 21 +++++++++++----------
 test/testsimplifytypedef.cpp | 16 ++++++++++++++++
 2 files changed, 27 insertions(+), 10 deletions(-)

diff --git a/lib/tokenize.cpp b/lib/tokenize.cpp
index 9e9749a4f..6f82c551d 100644
--- a/lib/tokenize.cpp
+++ b/lib/tokenize.cpp
@@ -410,17 +410,15 @@ namespace {
 static Token *splitDefinitionFromTypedef(Token *tok, nonneg int *unnamedCount)
 {
     std::string name;
-    bool isConst = false;
-    Token *tok1 = tok->next();
+    std::set<std::string> qualifiers;
 
-    // skip const if present
-    if (tok1->str() == "const") {
-        tok1->deleteThis();
-        isConst = true;
+    while (Token::Match(tok->next(), "const|volatile")) {
+        qualifiers.insert(tok->next()->str());
+        tok->deleteNext();
     }
 
     // skip "class|struct|union|enum"
-    tok1 = tok1->next();
+    Token *tok1 = tok->tokAt(2);
 
     const bool hasName = Token::Match(tok1, "%name%");
 
@@ -465,8 +463,8 @@ static Token *splitDefinitionFromTypedef(Token *tok, nonneg int *unnamedCount)
     tok1->insertToken("typedef");
     tok1 = tok1->next();
     Token * tok3 = tok1;
-    if (isConst) {
-        tok1->insertToken("const");
+    for (const std::string &qualifier : qualifiers) {
+        tok1->insertToken(qualifier);
         tok1 = tok1->next();
     }
     tok1->insertToken(tok->next()->str()); // struct, union or enum
@@ -1209,7 +1207,10 @@ void Tokenizer::simplifyTypedefCpp()
 
         // pull struct, union, enum or class definition out of typedef
         // use typedef name for unnamed struct, union, enum or class
-        if (Token::Match(tok->next(), "const| struct|enum|union|class %type%| {|:")) {
+        const Token* tokClass = tok->next();
+        while (Token::Match(tokClass, "const|volatile"))
+            tokClass = tokClass->next();
+        if (Token::Match(tokClass, "struct|enum|union|class %type%| {|:")) {
             Token *tok1 = splitDefinitionFromTypedef(tok, &mUnnamedCount);
             if (!tok1)
                 continue;
diff --git a/test/testsimplifytypedef.cpp b/test/testsimplifytypedef.cpp
index e845fa7da..1239ddbda 100644
--- a/test/testsimplifytypedef.cpp
+++ b/test/testsimplifytypedef.cpp
@@ -222,6 +222,8 @@ private:
         TEST_CASE(simplifyTypedefFunction9);
         TEST_CASE(simplifyTypedefFunction10); // #5191
 
+        TEST_CASE(simplifyTypedefStruct); // #12081 - volatile struct
+
         TEST_CASE(simplifyTypedefShadow);  // #4445 - shadow variable
 
         TEST_CASE(simplifyTypedefMacro);
@@ -4002,6 +4004,20 @@ private:
                       tok(code,false));
     }
 
+    void simplifyTypedefStruct() {
+        const char code1[] = "typedef struct S { int x; } xyz;\n"
+                             "xyz var;";
+        ASSERT_EQUALS("struct S { int x ; } ; struct S var ;", tok(code1,false));
+
+        const char code2[] = "typedef const struct S { int x; } xyz;\n"
+                             "xyz var;";
+        ASSERT_EQUALS("struct S { int x ; } ; const struct S var ;", tok(code2,false));
+
+        const char code3[] = "typedef volatile struct S { int x; } xyz;\n"
+                             "xyz var;";
+        ASSERT_EQUALS("struct S { int x ; } ; volatile struct S var ;", tok(code3,false));
+    }
+
     void simplifyTypedefShadow() { // shadow variable (#4445)
         const char code[] = "typedef struct { int x; } xyz;;\n"
                             "void f(){\n"