CMake: Add Google Benchmark (with FetchContent)

.appveyor.yml

@@ -31,6 +31,11 @@ test_script:
 
       & $_.FullName $cmdArgList
     }
+    Get-ChildItem -Recurse -Path $env:APPVEYOR_BUILD_FOLDER -Filter "*_benchmark.exe" | ForEach-Object {
+      Write-Output $_.FullName
+
+      & $_.FullName
+    }
 
 on_finish:
 - ps: |

cmake/OpenCensusDeps.cmake

@@ -23,12 +23,17 @@ fetchcontent_declare(abseil
                      GIT_REPOSITORY
                      https://github.com/abseil/abseil-cpp
                      GIT_TAG
-                     master)
+                     2c8421e1c6cef0da9e8a20b01c15256ec9ec116d)
 fetchcontent_declare(prometheus
                      GIT_REPOSITORY
                      https://github.com/jupp0r/prometheus-cpp
                      GIT_TAG
                      master)
+fetchcontent_declare(benchmark
+                     GIT_REPOSITORY
+                     https://github.com/google/benchmark
+                     GIT_TAG
+                     master)
 
 fetchcontent_getproperties(googletest)
 if(BUILD_TESTING)
@@ -72,3 +77,16 @@ if(NOT prometheus_POPULATED)
   add_subdirectory(${prometheus_SOURCE_DIR} ${prometheus_BINARY_DIR}
                    EXCLUDE_FROM_ALL)
 endif()
+
+fetchcontent_getproperties(benchmark)
+if(NOT benchmark_POPULATED)
+  set(BENCHMARK_ENABLE_TESTING OFF
+      CACHE BOOL "Enable testing of the benchmark library."
+      FORCE)
+  set(BENCHMARK_ENABLE_GTEST_TESTS OFF
+      CACHE BOOL "Enable building the unit tests which depend on gtest"
+      FORCE)
+  fetchcontent_populate(benchmark)
+  add_subdirectory(${benchmark_SOURCE_DIR} ${benchmark_BINARY_DIR}
+                   EXCLUDE_FROM_ALL)
+endif()

cmake/OpenCensusHelpers.cmake

@@ -38,6 +38,19 @@ function(opencensus_test NAME SRC)
   endif()
 endfunction()
 
+# Helper function like bazel's cc_benchmark. Usage:
+#
+# opencensus_benchmark(trace_some_benchmark internal/some_benchmark.cc dep1
+# dep2...)
+function(opencensus_benchmark NAME SRC)
+  if(BUILD_TESTING)
+    set(_NAME "opencensus_${NAME}")
+    add_executable(${_NAME} ${SRC})
+    prepend_opencensus(DEPS "${ARGN}")
+    target_link_libraries(${_NAME} "${DEPS}" benchmark)
+  endif()
+endfunction()
+
 # Helper function like bazel's cc_library.  Libraries are namespaced as
 # opencensus_* and public libraries are also aliased as opencensus-cpp::*.
 function(opencensus_lib NAME)

opencensus/common/internal/CMakeLists.txt

@@ -32,10 +32,10 @@ opencensus_lib(common_string_vector_hash)
 
 opencensus_test(common_random_test random_test.cc common_random)
 
+opencensus_benchmark(common_random_benchmark random_benchmark.cc common_random)
+
 opencensus_test(common_stats_object_test
                 stats_object_test.cc
                 common_stats_object
                 absl::strings
                 absl::span)
-
-# TODO: random_benchmark

opencensus/context/CMakeLists.txt

@@ -31,4 +31,5 @@ opencensus_test(context_context_test
 
 opencensus_test(context_with_context_test internal/with_context_test.cc context)
 
-# TODO: context_benchmark
+opencensus_benchmark(context_context_benchmark internal/context_benchmark.cc
+                     context)

opencensus/stats/CMakeLists.txt

@@ -116,4 +116,10 @@ opencensus_test(stats_view_data_impl_test
                 stats_core
                 absl::time)
 
-# TODO: benchmarks
+opencensus_benchmark(stats_stats_manager_benchmark
+                     internal/stats_manager_benchmark.cc
+                     stats_core
+                     stats_recording
+                     absl::memory
+                     absl::strings
+                     absl::time)

opencensus/tags/CMakeLists.txt

@@ -57,4 +57,7 @@ opencensus_test(tags_with_tag_map_test
                 tags_with_tag_map
                 context)
 
-# TODO: benchmarks
+opencensus_benchmark(tags_tag_map_benchmark
+                     internal/tag_map_benchmark.cc
+                     tags
+                     absl::strings)

opencensus/trace/CMakeLists.txt

@@ -190,4 +190,28 @@ opencensus_test(trace_with_span_test
                 trace_with_span
                 context)
 
-# TODO: benchmarks
+opencensus_benchmark(trace_attribute_value_ref_benchmark
+                     internal/attribute_value_ref_benchmark.cc trace)
+
+opencensus_benchmark(trace_cloud_trace_context_benchmark
+                     internal/cloud_trace_context_benchmark.cc
+                     trace_cloud_trace_context)
+
+opencensus_benchmark(trace_grpc_trace_bin_benchmark
+                     internal/grpc_trace_bin_benchmark.cc trace_grpc_trace_bin)
+
+opencensus_benchmark(trace_span_benchmark
+                     internal/span_benchmark.cc
+                     trace_span_context
+                     trace)
+
+opencensus_benchmark(trace_span_id_benchmark internal/span_id_benchmark.cc
+                     trace_span_context)
+
+opencensus_benchmark(trace_context_benchmark internal/trace_context_benchmark.cc
+                     trace_trace_context)
+
+opencensus_benchmark(trace_with_span_benchmark
+                     internal/with_span_benchmark.cc
+                     trace
+                     trace_with_span)