120 lines
3.8 KiB
C++
120 lines
3.8 KiB
C++
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//
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// Copyright 2020 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "absl/flags/flag.h"
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#include "absl/time/time.h"
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#include "absl/types/optional.h"
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#include "benchmark/benchmark.h"
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namespace {
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using String = std::string;
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using VectorOfStrings = std::vector<std::string>;
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using AbslDuration = absl::Duration;
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// We do not want to take over marshalling for the types absl::optional<int>,
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// absl::optional<std::string> which we do not own. Instead we introduce unique
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// "aliases" to these types, which we do.
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using AbslOptionalInt = absl::optional<int>;
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struct OptionalInt : AbslOptionalInt {
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using AbslOptionalInt::AbslOptionalInt;
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};
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// Next two functions represent Abseil Flags marshalling for OptionalInt.
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bool AbslParseFlag(absl::string_view src, OptionalInt* flag,
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std::string* error) {
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int val;
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if (src.empty())
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flag->reset();
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else if (!absl::ParseFlag(src, &val, error))
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return false;
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*flag = val;
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return true;
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}
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std::string AbslUnparseFlag(const OptionalInt& flag) {
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return !flag ? "" : absl::UnparseFlag(*flag);
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}
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using AbslOptionalString = absl::optional<std::string>;
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struct OptionalString : AbslOptionalString {
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using AbslOptionalString::AbslOptionalString;
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};
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// Next two functions represent Abseil Flags marshalling for OptionalString.
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bool AbslParseFlag(absl::string_view src, OptionalString* flag,
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std::string* error) {
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std::string val;
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if (src.empty())
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flag->reset();
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else if (!absl::ParseFlag(src, &val, error))
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return false;
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*flag = val;
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return true;
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}
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std::string AbslUnparseFlag(const OptionalString& flag) {
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return !flag ? "" : absl::UnparseFlag(*flag);
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}
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struct UDT {
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UDT() = default;
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UDT(const UDT&) {}
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UDT& operator=(const UDT&) { return *this; }
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};
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// Next two functions represent Abseil Flags marshalling for UDT.
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bool AbslParseFlag(absl::string_view, UDT*, std::string*) { return true; }
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std::string AbslUnparseFlag(const UDT&) { return ""; }
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} // namespace
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#define BENCHMARKED_TYPES(A) \
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A(bool) \
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A(int16_t) \
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A(uint16_t) \
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A(int32_t) \
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A(uint32_t) \
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A(int64_t) \
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A(uint64_t) \
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A(double) \
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A(float) \
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A(String) \
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A(VectorOfStrings) \
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A(OptionalInt) \
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A(OptionalString) \
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A(AbslDuration) \
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A(UDT)
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#define FLAG_DEF(T) ABSL_FLAG(T, T##_flag, {}, "");
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BENCHMARKED_TYPES(FLAG_DEF)
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namespace {
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#define BM_GetFlag(T) \
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void BM_GetFlag_##T(benchmark::State& state) { \
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for (auto _ : state) { \
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benchmark::DoNotOptimize(absl::GetFlag(FLAGS_##T##_flag)); \
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} \
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} \
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BENCHMARK(BM_GetFlag_##T);
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BENCHMARKED_TYPES(BM_GetFlag)
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} // namespace
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#define InvokeGetFlag(T) \
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T AbslInvokeGetFlag##T() { return absl::GetFlag(FLAGS_##T##_flag); } \
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int odr##T = (benchmark::DoNotOptimize(AbslInvokeGetFlag##T), 1);
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BENCHMARKED_TYPES(InvokeGetFlag)
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// To veiw disassembly use: gdb ${BINARY} -batch -ex "disassemble /s $FUNC"
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