[PATCH] D37566: [clang-tidy] fixed misc-unused-parameters omitting parameters default value

[Pawel Maciocha via Phabricator via cfe-commits]

PriMee created this revision.
Herald added a subscriber: JDevlieghere.

Bug: https://bugs.llvm.org/show_bug.cgi?id=34450

**Problem:**

Clang-tidy check misc-unused-parameters omits parameter default value what results in its complete removal. Compilation errors might occur after clang-tidy fix.

**Patch description:**

Changed removal range. The range should end after parameter declarator, not after whole parameter declaration (which might contain a default value).


https://reviews.llvm.org/D37566

Files:
  clang-tidy/misc/UnusedParametersCheck.cpp
  test/clang-tidy/misc-unused-parameters.cpp


Index: test/clang-tidy/misc-unused-parameters.cpp
===================================================================
--- test/clang-tidy/misc-unused-parameters.cpp
+++ test/clang-tidy/misc-unused-parameters.cpp
@@ -14,15 +14,16 @@
 
 void b(int i = 1) {}
 // CHECK-MESSAGES: :[[@LINE-1]]:12: warning: parameter 'i' is unused [misc-unused-parameters]
-// CHECK-FIXES: {{^}}void b(int  /*i*/) {}{{$}}
+// CHECK-FIXES: {{^}}void b(int  /*i*/ = 1) {}{{$}}
 
 void c(int *i) {}
 // CHECK-MESSAGES: :[[@LINE-1]]:13: warning: parameter 'i' is unused [misc-unused-parameters]
 // CHECK-FIXES: {{^}}void c(int * /*i*/) {}{{$}}
 
 // Unchanged cases
 // ===============
-void g(int i);             // Don't remove stuff in declarations
+void f(int i); // Don't remove stuff in declarations
+void g(int i = 1);
 void h(int i) { (void)i; } // Don't remove used parameters
 
 bool useLambda(int (*fn)(int));
@@ -52,6 +53,11 @@
 // CHECK-MESSAGES: :[[@LINE-1]]:33: warning
 // CHECK-FIXES: {{^}}static void staticFunctionE()
 
+static void staticFunctionF(int i = 4);
+// CHECK-FIXES: {{^}}static void staticFunctionF();
+static void staticFunctionF(int i) {}
+// CHECK-MESSAGES: :[[@LINE-1]]:33: warning
+// CHECK-FIXES: {{^}}static void staticFunctionF()
 
 static void someCallSites() {
   staticFunctionA(1);
@@ -62,7 +68,10 @@
 // CHECK-FIXES: staticFunctionC(2);
   staticFunctionD(1, 2, 3);
 // CHECK-FIXES: staticFunctionD(1, 3);
-  staticFunctionE();
+  staticFunctionE(1);
+// CHECK-FIXES: staticFunctionE();
+  staticFunctionF(1);
+// CHECK-FIXES: staticFunctionF();
 }
 
 /*
@@ -95,6 +104,9 @@
   static void f(int i) {}
 // CHECK-MESSAGES: :[[@LINE-1]]:21: warning
 // CHECK-FIXES: static void f(int  /*i*/) {}
+  static void g(int i = 1) {}
+// CHECK-MESSAGES: :[[@LINE-1]]:21: warning
+// CHECK-FIXES: static void g(int  /*i*/ = 1) {}
 };
 
 namespace {
@@ -108,6 +120,9 @@
   void h(int i) {}
 // CHECK-MESSAGES: :[[@LINE-1]]:14: warning
 // CHECK-FIXES: void h(int  /*i*/) {}
+  void s(int i = 1) {}
+// CHECK-MESSAGES: :[[@LINE-1]]:14: warning
+// CHECK-FIXES: void s(int  /*i*/ = 1) {}
 };
 
 void C::f(int i) {}
@@ -125,6 +140,7 @@
 // CHECK-FIXES: c.g();
 
   useFunction(&C::h);
+  useFunction(&C::s);
 }
 
 class Base {
Index: clang-tidy/misc/UnusedParametersCheck.cpp
===================================================================
--- clang-tidy/misc/UnusedParametersCheck.cpp
+++ clang-tidy/misc/UnusedParametersCheck.cpp
@@ -138,7 +138,8 @@
   if (Function->isExternallyVisible() ||
       !Result.SourceManager->isInMainFile(Function->getLocation()) ||
       !Indexer->getOtherRefs(Function).empty() || isOverrideMethod(Function)) {
-    SourceRange RemovalRange(Param->getLocation(), Param->getLocEnd());
+    SourceRange RemovalRange(Param->getLocation(),
+                             Param->DeclaratorDecl::getSourceRange().getEnd());
     // Note: We always add a space before the '/*' to not accidentally create a
     // '*/*' for pointer types, which doesn't start a comment. clang-format will
     // clean this up afterwards.


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