feat: add support for setting a custom benchmark name

Author: not-matthias

examples/google_benchmark_cmake/main.cpp

@@ -56,7 +56,68 @@ static void BM_memcpy(benchmark::State &state) {
   delete[] src;
   delete[] dst;
 }
-
 BENCHMARK(BM_memcpy)->Range(8, 8 << 10);
 
+static void BM_some_super_long_name_that_we_dont_want_to_use(
+    benchmark::State &state) {
+  for (auto _ : state) {
+    benchmark::DoNotOptimize(42);
+    benchmark::ClobberMemory();
+  }
+}
+BENCHMARK(BM_some_super_long_name_that_we_dont_want_to_use)
+    ->Name("BM_short_name");
+
+template <class... Args>
+void BM_Capture_custom_name(benchmark::State &state, Args &&...args) {
+  auto args_tuple = std::make_tuple(std::move(args)...);
+  for (auto _ : state) {
+    benchmark::DoNotOptimize(args_tuple);
+    benchmark::ClobberMemory();
+  }
+}
+BENCHMARK_CAPTURE(BM_Capture_custom_name, int_string_test, 42,
+                  std::string("abc"))
+    ->Name("BM_Capture_int_string");
+BENCHMARK_CAPTURE(BM_Capture_custom_name, int_test, 42, 43)
+    ->Name("BM_Capture_int");
+
+namespace one {
+namespace two {
+namespace three {
+static void BM_nested_namespaces_with_custom_name(benchmark::State &state) {
+  for (auto _ : state) {
+    benchmark::DoNotOptimize(42);
+    benchmark::ClobberMemory();
+  }
+}
+BENCHMARK(BM_nested_namespaces_with_custom_name)
+    ->Name("BM_custom_name_in_namespace");
+}  // namespace three
+}  // namespace two
+}  // namespace one
+
+// Test with actual numeric parameters
+static void BM_with_args(benchmark::State &state) {
+  for (auto _ : state) {
+    benchmark::DoNotOptimize(state.range(0));
+    benchmark::ClobberMemory();
+  }
+}
+BENCHMARK(BM_with_args)->Arg(100)->Arg(1000);
+BENCHMARK(BM_with_args)->Name("BM_custom_args")->Arg(100)->Arg(1000);
+
+// Test with multiple arguments
+static void BM_with_multiple_args(benchmark::State &state) {
+  for (auto _ : state) {
+    benchmark::DoNotOptimize(state.range(0) + state.range(1));
+    benchmark::ClobberMemory();
+  }
+}
+BENCHMARK(BM_with_multiple_args)->Args({10, 20})->Args({100, 200});
+BENCHMARK(BM_with_multiple_args)
+    ->Name("BM_custom_multi")
+    ->Args({10, 20})
+    ->Args({100, 200});
+
 BENCHMARK_MAIN();

google_benchmark/src/benchmark_register.cc

@@ -474,7 +474,29 @@ Benchmark* Benchmark::ThreadPerCpu() {
   return this;
 }
 
-void Benchmark::SetName(const std::string& name) { name_ = name; }
+void Benchmark::SetName(const std::string& name) {
+#ifdef CODSPEED_ENABLED
+  // Preserve file path and namespace prefix if present
+  size_t separator_pos = name_.rfind("::");
+  if (separator_pos != std::string::npos) {
+    std::string file_prefix = name_.substr(0, separator_pos + 2);
+
+    // Extract any parameters from the old name (format: "file::namespace::name[param1/param2/...]")
+    size_t bracket_pos = name_.find('[', separator_pos);
+    std::string params;
+    if (bracket_pos != std::string::npos) {
+      params = name_.substr(bracket_pos);  // Include everything from '[' onwards
+    }
+
+    // Reconstruct: file_prefix + new_name + params
+    name_ = file_prefix + name + params;
+  } else {
+    name_ = name;
+  }
+#else
+  name_ = name;
+#endif
+}
 
 const char* Benchmark::GetName() const { return name_.c_str(); }