Review of WasmVM.

.bazelrc

@@ -0,0 +1 @@
+build --cxxopt="-std=c++17"

.clang-format

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+---
+Language: Cpp
+ColumnLimit: 100
+AccessModifierOffset: -2
+DerivePointerAlignment: false
+PointerAlignment: Right
+SortIncludes: false
+...
+
+---
+Language: Proto
+ColumnLimit: 100
+AllowShortFunctionsOnASingleLine: false
+ReflowComments: false
+SpacesInContainerLiterals: false
+...

BUILD

@@ -0,0 +1,57 @@
+licenses(["notice"])  # Apache 2
+
+package(default_visibility = ["//visibility:public"])
+
+cc_library(
+    name = "include",
+    hdrs = [
+        "include/proxy-wasm/compat.h",
+        "include/proxy-wasm/wasm_vm.h",
+        "include/proxy-wasm/word.h",
+    ],
+    deps = [
+        "@proxy_wasm_cpp_sdk//:common_lib",
+    ],
+)
+
+# TODO: remove when dependent projects have been upgraded.
+cc_library(
+    name = "include14",
+    hdrs = [
+        "include/proxy-wasm/compat.h",
+        "include/proxy-wasm/wasm_vm.h",
+        "include/proxy-wasm/word.h",
+    ],
+    copts = ["-std=c++14"],
+    deps = [
+        "@proxy_wasm_cpp_sdk//:common_lib",
+    ],
+)
+
+cc_test(
+    name = "wasm_vm_test",
+    srcs = ["wasm_vm_test.cc"],
+    deps = [
+        ":include",
+        "@com_google_absl//absl/base",
+        "@com_google_absl//absl/strings:strings",
+        "@com_google_absl//absl/types:optional",
+        "@com_google_googletest//:gtest",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+# TODO: remove when dependent projects have been upgraded.
+cc_test(
+    name = "wasm_vm_14_test",
+    srcs = ["wasm_vm_test.cc"],
+    copts = ["-std=c++14"],
+    deps = [
+        ":include14",
+        "@com_google_absl//absl/base",
+        "@com_google_absl//absl/strings:strings",
+        "@com_google_absl//absl/types:optional",
+        "@com_google_googletest//:gtest",
+        "@com_google_googletest//:gtest_main",
+    ],
+)

WORKSPACE

@@ -1 +1,25 @@
 workspace(name = "proxy_wasm_cpp_host")
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+http_archive(
+    name = "proxy_wasm_cpp_sdk",
+    sha256 = "14f66f67e8f37ec81d28d7f5307be4407d206ac5f0daaf6d22fa5536797bcac1",
+    strip_prefix = "proxy-wasm-cpp-sdk-31f1fc5b7e09f231fa532d2d296e479a113c3e10",
+    urls = ["https://github.com/proxy-wasm/proxy-wasm-cpp-sdk/archive/31f1fc5b7e09f231fa532d2d296e479a113c3e10.tar.gz"],
+)
+
+http_archive(
+    name = "com_google_absl",
+    sha256 = "19391fb4882601a65cb648d638c11aa301ce5f525ef02da1a9eafd22f72d7c59",
+    strip_prefix = "abseil-cpp-37dd2562ec830d547a1524bb306be313ac3f2556",
+    # 2020-01-29
+    urls = ["https://github.com/abseil/abseil-cpp/archive/37dd2562ec830d547a1524bb306be313ac3f2556.tar.gz"],
+)
+
+http_archive(
+    name = "com_google_googletest",
+    sha256 = "9dc9157a9a1551ec7a7e43daea9a694a0bb5fb8bec81235d8a1e6ef64c716dcb",
+    strip_prefix = "googletest-release-1.10.0",
+    urls = ["https://github.com/google/googletest/archive/release-1.10.0.tar.gz"],
+)

include/proxy-wasm/compat.h

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+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+// Provide compatibiliby for projects which have not yet moved to C++17.
+// TODO: remove this when all dependent projects have upgraded.
+
+#ifndef __cpp_lib_optional
+#include "absl/types/optional.h"
+#else
+#include <optional>
+#endif
+
+#ifndef __cpp_lib_string_view
+#include "absl/strings/string_view.h"
+#else
+#include <string_view>
+#endif
+
+namespace proxy_wasm {
+#ifndef __cpp_lib_optional
+template <typename T> using optional = absl::optional<T>;
+// Only available in C++17
+// inline constexpr absl::nullopt_t nullopt = absl::nullopt;
+#define PROXY_WASM_NULLOPT absl::nullopt
+#else
+template <typename T> using optional = std::optional<T>;
+// Only available in C++17
+// inline constexpr std::nullopt_t nullopt = std::nullopt;
+#define PROXY_WASM_NULLOPT std::nullopt
+#endif
+
+#ifndef __cpp_lib_string_view
+using string_view = absl::string_view;
+#else
+using string_view = std::string_view;
+#endif
+} // namespace proxy_wasm