Enable libc-wasi for windows msvc build (#3852)

The default iwasm building in Windows MSVC enables libc-uvwasi because
libc-wasi isn't supported at the beginning. Since libc-wasi had been refactored
and is supported in Windows msys2 building, and libc-wasi supports more
functionalities(e.g. sockets) than libc-uvwasi, this PR fixes some issues to
enable libc-wasi in windows MSVC buidlings.

core/iwasm/aot/aot_loader.c

@@ -2512,6 +2512,15 @@ try_merge_data_and_text(const uint8 **buf, const uint8 **buf_end,
         /* merge failed but may be not critical for some targets */
         return false;
     }
+
+#ifdef BH_PLATFORM_WINDOWS
+    if (!os_mem_commit(sections, code_size,
+                       MMAP_PROT_READ | MMAP_PROT_WRITE | MMAP_PROT_EXEC)) {
+        os_munmap(sections, (uint32)total_size);
+        return false;
+    }
+#endif
+
     /* change the code part to be executable */
     if (os_mprotect(sections, code_size,
                     MMAP_PROT_READ | MMAP_PROT_WRITE | MMAP_PROT_EXEC)

core/iwasm/libraries/libc-wasi/sandboxed-system-primitives/src/refcount.h

@@ -132,6 +132,35 @@ refcount_release(struct refcount *r)
 #error "Reference counter isn't implemented"
 #endif /* end of __GNUC_PREREQ (4.7) */
 
+#elif defined(_MSC_VER)
+
+/* Simple reference counter. */
+struct LOCKABLE refcount {
+    LONG count;
+};
+
+/* Initialize the reference counter. */
+static inline void
+refcount_init(struct refcount *r, unsigned int count)
+{
+    InterlockedExchange(&r->count, (LONG)count);
+}
+
+/* Increment the reference counter. */
+static inline void
+refcount_acquire(struct refcount *r)
+{
+    InterlockedIncrement(&r->count);
+}
+
+/* Decrement the reference counter, returning whether the reference
+   dropped to zero. */
+static inline bool
+refcount_release(struct refcount *r)
+{
+    return InterlockedDecrement(&r->count) == 0 ? true : false;
+}
+
 #else /* else of CONFIG_HAS_STD_ATOMIC */
 #error "Reference counter isn't implemented"
 #endif /* end of CONFIG_HAS_STD_ATOMIC */

core/iwasm/libraries/libc-wasi/sandboxed-system-primitives/src/ssp_config.h

@@ -70,9 +70,11 @@
 #endif
 
 #if !defined(BH_PLATFORM_LINUX_SGX)
+
 /* Clang's __GNUC_PREREQ macro has a different meaning than GCC one,
 so we have to handle this case specially */
 #if defined(__clang__)
+
 /* Clang provides stdatomic.h since 3.6.0
 See https://releases.llvm.org/3.6.0/tools/clang/docs/ReleaseNotes.html */
 #if __clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 6)
@@ -80,7 +82,9 @@ See https://releases.llvm.org/3.6.0/tools/clang/docs/ReleaseNotes.html */
 #else
 #define CONFIG_HAS_STD_ATOMIC 0
 #endif
+
 #elif defined(__GNUC_PREREQ)
+
 /* Even though older versions of GCC support C11, atomics were
 not implemented until 4.9. See
 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58016 */
@@ -89,11 +93,21 @@ https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58016 */
 #else /* else of __GNUC_PREREQ(4, 9) */
 #define CONFIG_HAS_STD_ATOMIC 0
 #endif /* end of __GNUC_PREREQ(4, 9) */
-#else  /* else of defined(__GNUC_PREREQ) */
-#define CONFIG_HAS_STD_ATOMIC 1
-#endif /* end of defined(__GNUC_PREREQ) */
-#else  /* else of !defined(BH_PLATFORM_LINUX_SGX) */
+
+#elif defined(_MSC_VER)
+
 #define CONFIG_HAS_STD_ATOMIC 0
+
+#else
+
+#define CONFIG_HAS_STD_ATOMIC 1
+
+#endif /* end of defined(__clang__) */
+
+#else /* else of !defined(BH_PLATFORM_LINUX_SGX) */
+
+#define CONFIG_HAS_STD_ATOMIC 0
+
 #endif /* end of !defined(BH_PLATFORM_LINUX_SGX) */
 
-#endif
+#endif /* end of SSP_CONFIG_H */