Add benchmarks

Author: qmfrederik

.github/workflows/main.yml

@@ -47,7 +47,7 @@ jobs:
       - uses: actions/checkout@v3
       - name: Install dependencies 
         run: |
-          sudo apt install ninja-build
+          sudo apt install ninja-build libbenchmark-dev
           if [ "${{ matrix.cxxlib }}" = "libc++" ]; then
             sudo apt remove -y 'libc++*'
             apt search libunwind
@@ -71,7 +71,7 @@ jobs:
             export EMBEDDED_BLOCKS_RUNTIME=ON
           fi
           ls -lahR /usr/lib/llvm-${{ matrix.llvm-version }}/lib/
-          cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{matrix.build-type}} -G Ninja -DTESTS=ON -DEMBEDDED_BLOCKS_RUNTIME=$EMBEDDED_BLOCKS_RUNTIME -DCMAKE_C_COMPILER=clang-${{matrix.llvm-version}} -DCMAKE_OBJC_COMPILER=clang-${{matrix.llvm-version}} -DCMAKE_ASM_COMPILER=clang-${{matrix.llvm-version}} -DCMAKE_CXX_COMPILER=clang++-${{matrix.llvm-version}} -DCMAKE_OBJCXX_COMPILER=clang++-${{matrix.llvm-version}} -DCMAKE_CXX_FLAGS="-stdlib=${{matrix.cxxlib}}"
+          cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{matrix.build-type}} -G Ninja -DTESTS=ON -DBENCHMARKS=ON -DEMBEDDED_BLOCKS_RUNTIME=$EMBEDDED_BLOCKS_RUNTIME -DCMAKE_C_COMPILER=clang-${{matrix.llvm-version}} -DCMAKE_OBJC_COMPILER=clang-${{matrix.llvm-version}} -DCMAKE_ASM_COMPILER=clang-${{matrix.llvm-version}} -DCMAKE_CXX_COMPILER=clang++-${{matrix.llvm-version}} -DCMAKE_OBJCXX_COMPILER=clang++-${{matrix.llvm-version}} -DCMAKE_CXX_FLAGS="-stdlib=${{matrix.cxxlib}}"
         # Build with a nice ninja status line
       - name: Build
         working-directory: ${{github.workspace}}/build
@@ -81,6 +81,11 @@ jobs:
         working-directory: ${{github.workspace}}/build
         run: |
           ctest --output-on-failure -j 4
+      - name: Benchmark
+        working-directory: ${{github.workspace}}/build
+        run: |
+          ./benchmarks/benchmark_objc_msgSend
+        if: matrix.cxxlib == 'libstdc++'
 
   qemu-crossbuild:
     strategy:
@@ -237,12 +242,12 @@ jobs:
       with:
         msystem: ${{ matrix.msystem }}
         update: true
-        install: git mingw-w64-${{ matrix.package-prefix }}-clang mingw-w64-${{ matrix.package-prefix }}-lld mingw-w64-${{ matrix.package-prefix }}-cmake
+        install: git mingw-w64-${{ matrix.package-prefix }}-clang mingw-w64-${{ matrix.package-prefix }}-lld mingw-w64-${{ matrix.package-prefix }}-cmake mingw-w64-${{ matrix.package-prefix }}-benchmark
     - name: Configure CMake
       run: |        
         mkdir build
         cd build
-        ${{ matrix.cmake-flags }} cmake .. -DTESTS=ON -DCMAKE_C_COMPILER="clang" -DCMAKE_CXX_COMPILER="clang++" -DCMAKE_BUILD_TYPE=${{ matrix.build-type }} -DSTRICT_APPLE_COMPATIBILITY=${{ matrix.strict-apple-compatibility }}
+        ${{ matrix.cmake-flags }} cmake .. -DTESTS=ON -DBENCHMARKS=ON -DCMAKE_C_COMPILER="clang" -DCMAKE_CXX_COMPILER="clang++" -DCMAKE_BUILD_TYPE=${{ matrix.build-type }} -DSTRICT_APPLE_COMPATIBILITY=${{ matrix.strict-apple-compatibility }}
     - name: Build
       working-directory: build
       run: |
@@ -251,6 +256,10 @@ jobs:
       working-directory: build
       run: |
         ctest -j 4 --output-on-failure -T test ${{ matrix.ctest-flags }}
+    - name: Benchmark
+      working-directory: build
+      run: |
+        ./benchmarks/benchmark_objc_msgSend.exe
     - name: Install
       working-directory: build
       run: |

CMakeLists.txt

@@ -140,6 +140,7 @@ option(DEBUG_ARC_COMPAT
 	"Log warnings for classes that don't hit ARC fast paths" OFF)
 option(ENABLE_OBJCXX "Enable support for Objective-C++" ON)
 option(TESTS "Enable building the tests")
+option(BENCHMARKS "Enable building the benchmarks" OFF)
 option(EMBEDDED_BLOCKS_RUNTIME "Include an embedded blocks runtime, rather than relying on libBlocksRuntime to supply it" ON)
 option(STRICT_APPLE_COMPATIBILITY "Use strict Apple compatibility, always defining BOOL as signed char" OFF)
 
@@ -448,6 +449,10 @@ if (TESTS)
 	add_subdirectory(Test)
 endif (TESTS)
 
+if (BENCHMARKS)
+	add_subdirectory(benchmarks)
+endif()
+
 CHECK_CXX_SOURCE_COMPILES("
 	#include <stdlib.h>
 	extern \"C\" {

benchmarks/CMakeLists.txt

@@ -0,0 +1,6 @@
+find_package(benchmark REQUIRED)
+
+add_executable(benchmark_objc_msgSend objc_msgSend.cpp TestClass.m)
+
+target_compile_options(benchmark_objc_msgSend PRIVATE "-fobjc-runtime=gnustep-2.0")
+target_link_libraries(benchmark_objc_msgSend benchmark::benchmark objc)

benchmarks/TestClass.m

@@ -0,0 +1,10 @@
+@interface TestClass
+- (int)answer;
+@end
+
+@implementation TestClass
+- (int)answer
+{
+	return 42;
+}
+@end

benchmarks/objc_msgSend.cpp

@@ -0,0 +1,20 @@
+#include <benchmark/benchmark.h>
+#include "../objc/runtime.h"
+#include <assert.h>
+
+static id testClass;
+static SEL answerSel;
+
+static void objc_msgSend(benchmark::State& state) {
+  id testClass = objc_getClass("TestClass");
+  SEL answerSel = sel_registerName("answer");
+    for (auto _ : state)
+	  {
+      id a = objc_msgSend(testClass, answerSel);
+      assert((uintptr_t)a == 42);
+    }
+  }
+  // Register the function as a benchmark
+  BENCHMARK(objc_msgSend)->Repetitions(25);
+  
+  BENCHMARK_MAIN();