Fix #15176: Export isAttributeUsed to dumpfile (#8995)

Author: ludviggunne

lib/tokenize.cpp

@@ -6359,6 +6359,8 @@ void Tokenizer::dump(std::ostream &out) const
             outs += " isAttributeMaybeUnused=\"true\"";
         if (tok->isAttributeUnused())
             outs += " isAttributeUnused=\"true\"";
+        if (tok->isAttributeUsed())
+            outs += " isAttributeUsed=\"true\"";
         if (tok->isAttributeFallthrough())
             outs += " isAttributeFallthrough=\"true\"";
         if (tok->isInitBracket())

test/testtokenize.cpp

@@ -537,6 +537,7 @@ class TestTokenizer : public TestFixture {
         TEST_CASE(simplifyPlatformTypes);
 
         TEST_CASE(dumpFallthrough);
+        TEST_CASE(dumpAttributeUsed);
 
         TEST_CASE(simplifyRedundantParentheses);
 
@@ -9389,6 +9390,16 @@ class TestTokenizer : public TestFixture {
         ASSERT(dump.find(" isAttributeFallthrough=\"true\"") != std::string::npos);
     }
 
+    void dumpAttributeUsed() {
+        const char code[] = "static int x __attribute__((used));\n";
+        SimpleTokenizer tokenizer(settingsDefault, *this, false);
+        ASSERT(tokenizer.tokenize(code));
+        std::ostringstream ostr;
+        tokenizer.dump(ostr);
+        const std::string dump = ostr.str();
+        ASSERT(dump.find(" isAttributeUsed=\"true\"") != std::string::npos);
+    }
+
     void simplifyRedundantParentheses() {
         const char code[] = "int f(struct S s) {\n"
                             "    return g(1, &(int){ s.i });\n"