add realtime and monotonic clock support for wasi on windows

.circleci/config.yml

@@ -176,6 +176,10 @@ jobs:
             export LLVM_SYS_70_PREFIX="`pwd`/clang+llvm-7.0.0-x86_64-linux-gnu-ubuntu-16.04/"
             make test-emscripten-clif
             make test-emscripten-llvm
+      - run:
+          name: Debug flag checked
+          command: |
+            cargo check --features "debug"
       - run:
           name: Release Build
           command: |
@@ -189,10 +193,6 @@ jobs:
             echo "${CIRCLE_TAG}" >> artifacts/git_version
             make build-install
             cp ./wasmer.tar.gz ./artifacts/$(./binary-name.sh)
-      - run:
-          name: Debug flag checked
-          command: |
-            cargo check --features "debug"
       - persist_to_workspace:
           root: .
           paths:

lib/wasi/Cargo.toml

@@ -19,6 +19,7 @@ log = "0.4.6"
 byteorder = "1.3.1"
 # hack to get tests to work
 wasmer-singlepass-backend = { path = "../singlepass-backend", version = "0.4.2", optional = true }
+winapi = "0.3"
 
 [build-dependencies]
 glob = "0.2.11"

lib/wasi/src/lib.rs

@@ -2,6 +2,8 @@
 
 #[macro_use]
 extern crate log;
+#[cfg(target = "windows")]
+extern crate winapi;
 
 #[macro_use]
 mod macros;

lib/wasi/src/state.rs

@@ -219,7 +219,7 @@ impl WasiFs {
         }
         debug!("wasi::fs::mapped_dirs");
         for (alias, real_dir) in mapped_dirs {
-            debug!("Attempting to open {:?} at {}", dest_dir, alias);
+            debug!("Attempting to open {:?} at {}", real_dir, alias);
             // TODO: think about this
             let default_rights = 0x1FFFFFFF; // all rights
             let cur_dir_metadata = real_dir

lib/wasi/src/syscalls/windows.rs

@@ -5,13 +5,51 @@ pub fn platform_clock_res_get(
     clock_id: __wasi_clockid_t,
     resolution: &Cell<__wasi_timestamp_t>,
 ) -> __wasi_errno_t {
-    __WASI_EINVAL
+    let resolution_val = match clock_id {
+        // resolution of monotonic clock at 10ms, from:
+        // https://docs.microsoft.com/en-us/windows/desktop/api/sysinfoapi/nf-sysinfoapi-gettickcount64
+        __WASI_CLOCK_MONOTONIC => 10_000_000,
+        // TODO: verify or compute this
+        __WASI_CLOCK_REALTIME => 1,
+        __WASI_CLOCK_PROCESS_CPUTIME_ID => {
+            return __WASI_EINVAL;
+        }
+        __WASI_CLOCK_THREAD_CPUTIME_ID => {
+            return __WASI_EINVAL;
+        }
+        _ => return __WASI_EINVAL,
+    };
+    resolution.set(resolution_val);
+    __WASI_ESUCCESS
 }
 
 pub fn platform_clock_time_get(
     clock_id: __wasi_clockid_t,
     precision: __wasi_timestamp_t,
     time: &Cell<__wasi_timestamp_t>,
 ) -> __wasi_errno_t {
-    unimplemented!()
+    let nanos = match clock_id {
+        __WASI_CLOCK_MONOTONIC => {
+            let tick_ms = unsafe { winapi::um::sysinfoapi::GetTickCount64() };
+            tick_ms * 1_000_000
+        }
+        __WASI_CLOCK_REALTIME => {
+            let duration = wasi_try!(std::time::SystemTime::now()
+                .duration_since(std::time::UNIX_EPOCH)
+                .map_err(|e| {
+                    debug!("Error in wasi::platform_clock_time_get: {:?}", e);
+                    __WASI_EIO
+                }));
+            duration.as_nanos() as u64
+        }
+        __WASI_CLOCK_PROCESS_CPUTIME_ID => {
+            unimplemented!("wasi::platform_clock_time_get(__WASI_CLOCK_PROCESS_CPUTIME_ID, ..)")
+        }
+        __WASI_CLOCK_THREAD_CPUTIME_ID => {
+            unimplemented!("wasi::platform_clock_time_get(__WASI_CLOCK_THREAD_CPUTIME_ID, ..)")
+        }
+        _ => return __WASI_EINVAL,
+    };
+    time.set(nanos);
+    __WASI_ESUCCESS
 }