export wasi_clock_time_get

Signed-off-by: mathetake <takeshi@tetrate.io>

Author: mathetake

include/proxy-wasm/exports.h

@@ -144,7 +144,7 @@ Word wasi_unstable_environ_sizes_get(void *raw_context, Word count_ptr, Word buf
 Word wasi_unstable_args_get(void *raw_context, Word argc_ptr, Word argv_buf_size_ptr);
 Word wasi_unstable_args_sizes_get(void *raw_context, Word argc_ptr, Word argv_buf_size_ptr);
 void wasi_unstable_proc_exit(void *, Word);
-void wasi_unstable_proc_exit(void *, Word);
+Word wasi_unstable_clock_time_get(void *, Word, int64_t, Word);
 Word pthread_equal(void *, Word left, Word right);
 
 // Support for embedders, not exported to Wasm.

include/proxy-wasm/wasm_vm.h

@@ -76,6 +76,7 @@ template <size_t N> using WasmCallbackWord = WasmFuncType<N, Word, void *, Word>
 // Extended with W = Word
 // Z = void, j = uint32_t, l = int64_t, m = uint64_t
 using WasmCallback_WWl = Word (*)(void *, Word, int64_t);
+using WasmCallback_WWlW = Word (*)(void *, Word, int64_t, Word);
 using WasmCallback_WWlWW = Word (*)(void *, Word, int64_t, Word, Word);
 using WasmCallback_WWm = Word (*)(void *, Word, uint64_t);
 using WasmCallback_dd = double (*)(void *, double);
@@ -92,9 +93,10 @@ using WasmCallback_dd = double (*)(void *, double);
                                   _f(proxy_wasm::WasmCallbackWord<10>)                             \
                                       _f(proxy_wasm::WasmCallbackWord<12>)                         \
                                           _f(proxy_wasm::WasmCallback_WWl)                         \
-                                              _f(proxy_wasm::WasmCallback_WWlWW)                   \
-                                                  _f(proxy_wasm::WasmCallback_WWm)                 \
-                                                      _f(proxy_wasm::WasmCallback_dd)
+                                              _f(proxy_wasm::WasmCallback_WWlW)                    \
+                                                  _f(proxy_wasm::WasmCallback_WWlWW)               \
+                                                      _f(proxy_wasm::WasmCallback_WWm)             \
+                                                          _f(proxy_wasm::WasmCallback_dd)
 
 enum class Cloneable {
   NotCloneable,      // VMs can not be cloned and should be created from scratch.

src/exports.cc

@@ -798,6 +798,22 @@ Word wasi_unstable_args_sizes_get(void *raw_context, Word argc_ptr, Word argv_bu
   return 0; // __WASI_ESUCCESS
 }
 
+// __wasi_errno_t __wasi_clock_time_get(uint32_t *id, uint64_t precision, uint64_t* time);
+Word wasi_unstable_clock_time_get(void *raw_context, Word clock_id, int64_t precision,
+                                  Word result_time_uint64_ptr) {
+
+  if (clock_id != 0 /* realtime */) {
+    return 58; // __WASI_ENOTSUP
+  }
+
+  auto context = WASM_CONTEXT(raw_context);
+  uint64_t result = context->getCurrentTimeNanoseconds();
+  if (!context->wasm()->setDatatype(result_time_uint64_ptr, result)) {
+    return 21; // __WASI_EFAULT
+  }
+  return 0; // __WASI_ESUCCESS
+}
+
 // void __wasi_proc_exit(__wasi_exitcode_t rval);
 void wasi_unstable_proc_exit(void *raw_context, Word) {
   auto context = WASM_CONTEXT(raw_context);

src/wasm.cc

@@ -131,6 +131,7 @@ void WasmBase::registerCallbacks() {
   _REGISTER_WASI(environ_sizes_get);
   _REGISTER_WASI(args_get);
   _REGISTER_WASI(args_sizes_get);
+  _REGISTER_WASI(clock_time_get);
   _REGISTER_WASI(proc_exit);
 #undef _REGISTER_WASI