wasmtime: fix build on Windows.

.bazelrc

@@ -38,4 +38,5 @@ build:macos --cxxopt=-std=c++17
 build:windows --enable_runfiles
 build:windows --cxxopt="/std:c++17"
 # See https://bytecodealliance.github.io/wasmtime/c-api/
-# build:windows --linkopt="ws2_32.lib advapi32.lib userenv.lib ntdll.lib shell32.lib ole32.lib"
+build:windows --copt="/DWASM_API_EXTERN="
+build:windows --linkopt="ws2_32.lib advapi32.lib userenv.lib ntdll.lib shell32.lib ole32.lib bcrypt.lib"

.github/workflows/cpp.yml

@@ -195,6 +195,12 @@ jobs:
           os: macos-11
           arch: x86_64
           action: test
+        - name: 'Wasmtime on Windows/x86_64'
+          engine: 'wasmtime'
+          repo: 'com_github_bytecodealliance_wasmtime'
+          os: windows-2019
+          arch: x86_64
+          action: test
         - name: 'WAVM on Linux/x86_64'
           engine: 'wavm'
           repo: 'com_github_wavm_wavm'
@@ -257,7 +263,7 @@ jobs:
         //test/...
 
     - name: Bazel build/test (signed Wasm module)
-      if: ${{ matrix.engine != 'null' }}
+      if: ${{ matrix.engine != 'null' && !startsWith(matrix.os, 'windows') }}
       run: >
         ${{ matrix.run_under }}
         bazel ${{ matrix.action }}

include/proxy-wasm/context.h

@@ -239,30 +239,10 @@ class ContextBase : public RootInterface,
   }
   uint32_t getLogLevel() override { return static_cast<uint32_t>(LogLevel::info); }
   uint64_t getCurrentTimeNanoseconds() override {
-#if !defined(_MSC_VER)
-    struct timespec tpe;
-    clock_gettime(CLOCK_REALTIME, &tpe);
-    uint64_t t = tpe.tv_sec;
-    t *= 1000000000;
-    t += tpe.tv_nsec;
-    return t;
-#else
-    unimplemented();
-    return 0;
-#endif
+    return std::chrono::system_clock::now().time_since_epoch().count();
   }
   uint64_t getMonotonicTimeNanoseconds() override {
-#if !defined(_MSC_VER)
-    struct timespec tpe;
-    clock_gettime(CLOCK_MONOTONIC, &tpe);
-    uint64_t t = tpe.tv_sec;
-    t *= 1000000000;
-    t += tpe.tv_nsec;
-    return t;
-#else
-    unimplemented();
-    return 0;
-#endif
+    return std::chrono::steady_clock::now().time_since_epoch().count();
   }
   std::string_view getConfiguration() override {
     unimplemented();

src/wasmtime/wasmtime.cc

@@ -585,8 +585,13 @@ void Wasmtime::getModuleFunctionImpl(std::string_view function_name,
   }
 
   *function = [func, function_name, this](ContextBase *context, Args... args) -> void {
-    wasm_val_t params_arr[] = {makeVal(args)...};
-    const wasm_val_vec_t params = WASM_ARRAY_VEC(params_arr);
+    wasm_val_vec_t params;
+    if constexpr (sizeof...(args) > 0) {
+      wasm_val_t params_arr[] = {makeVal(args)...};
+      params = WASM_ARRAY_VEC(params_arr);
+    } else {
+      params = WASM_EMPTY_VEC;
+    }
     wasm_val_vec_t results = WASM_EMPTY_VEC;
     const bool log = cmpLogLevel(LogLevel::trace);
     if (log) {
@@ -633,8 +638,13 @@ void Wasmtime::getModuleFunctionImpl(std::string_view function_name,
   }
 
   *function = [func, function_name, this](ContextBase *context, Args... args) -> R {
-    wasm_val_t params_arr[] = {makeVal(args)...};
-    const wasm_val_vec_t params = WASM_ARRAY_VEC(params_arr);
+    wasm_val_vec_t params;
+    if constexpr (sizeof...(args) > 0) {
+      wasm_val_t params_arr[] = {makeVal(args)...};
+      params = WASM_ARRAY_VEC(params_arr);
+    } else {
+      params = WASM_EMPTY_VEC;
+    }
     wasm_val_t results_arr[1];
     wasm_val_vec_t results = WASM_ARRAY_VEC(results_arr);
     const bool log = cmpLogLevel(LogLevel::trace);