Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

external/llvm/test/tools/llvm-cov/prefer_used_to_unused.h

@@ -0,0 +1,24 @@
+// Check that llvm-cov loads real coverage mapping data for a function
+// even though dummy coverage data for that function comes first.
+// Dummy coverage data is exported if the definition of an inline function
+// is seen but the function is not used in the translation unit.
+
+// If you need to rebuild the 'covmapping' file for this test, please use
+// the following commands:
+// clang++ -fprofile-instr-generate -fcoverage-mapping -o tmp -x c++ prefer_used_to_unused.h prefer_used_to_unused.cpp
+// llvm-cov convert-for-testing -o prefer_used_to_unused.covmapping tmp
+
+// RUN: llvm-profdata merge %S/Inputs/prefer_used_to_unused.proftext -o %t.profdata
+// RUN: llvm-cov show %S/Inputs/prefer_used_to_unused.covmapping -instr-profile %t.profdata -path-equivalence=/tmp/,%S %s | FileCheck %s
+
+// Coverage data for this function has a non-zero hash value if it is used in the translation unit.
+inline int sampleFunc(int A) { // CHECK:      [[@LINE]]| 1|inline int sampleFunc(int A) {
+  if (A > 0)                   // CHECK-NEXT: [[@LINE]]| 1|  if (A > 0)
+    return A;                  // CHECK-NEXT: [[@LINE]]| 1|    return A;
+  return 0;                    // CHECK-NEXT: [[@LINE]]| 0|  return 0;
+}                              // CHECK-NEXT: [[@LINE]]| 0|}
+
+// The hash for this function is zero in both cases, either it is used in the translation unit or not.
+inline int simpleFunc(int A) { // CHECK:      [[@LINE]]| 1|inline int simpleFunc(int A) {
+  return A;                    // CHECK-NEXT: [[@LINE]]| 1|  return A;
+}                              // CHECK-NEXT: [[@LINE]]| 1|}