WASM support (#24)

Never compiled with JS and presented on documentation page
Co-authored-by: smaludzi <[email protected]>

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.0.2)
 project(never)
 enable_language(C)
 
@@ -29,7 +29,6 @@ if ("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_C_COMPILER_ID}" STREQUAL
   endif(ENABLE_COVERAGE)
 endif ()
 
-
 file(GLOB SRC
 	"back/*.c"
 	"front/*.c"
@@ -42,11 +41,29 @@ add_library(nev STATIC
 	${FLEX_scanner_OUTPUTS}
 	${SRC}
 )
-target_link_libraries(nev m dl ffi)
+
+if (WASM_ONLY OR JS_ONLY)
+  target_link_libraries(nev m dl)
+else()
+  target_link_libraries(nev m dl ffi)
+endif()
 
 add_executable(${CMAKE_PROJECT_NAME} main.c getopt.c)
 target_link_libraries(${CMAKE_PROJECT_NAME} nev)
 
+if(WASM_ONLY)
+  message(STATUS "Setting compilation target to native WASM")
+  set(CMAKE_EXECUTABLE_SUFFIX ".wasm")
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DNDEBUG -DNO_FFI")
+  set_target_properties(${CMAKE_PROJECT_NAME} PROPERTIES LINK_FLAGS "-s WASM=1 -s EXPORTED_FUNCTIONS='[_never]' -s EXTRA_EXPORTED_RUNTIME_METHODS='[ccall, cwrap]'")
+endif(WASM_ONLY)
+
+if(JS_ONLY)
+  message(STATUS "Setting compilation target to native JavaScript")
+  set(CMAKE_EXECUTABLE_SUFFIX ".js")
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DNDEBUG -DNO_FFI")
+  set_target_properties(${CMAKE_PROJECT_NAME} PROPERTIES LINK_FLAGS "-s WASM=0 -s EXPORTED_FUNCTIONS='[_never]' -s EXTRA_EXPORTED_RUNTIME_METHODS='[ccall, cwrap]' --pre-js ../never-init.js")
+endif(JS_ONLY)
 
 # test
 enable_testing()

back/dlcache.c

@@ -11,7 +11,7 @@ dlcache_entry * dlcache_entry_new(unsigned int size)
 {
     dlcache_entry * entry = (dlcache_entry *)malloc(sizeof(dlcache_entry) * size);
     memset(entry, 0, sizeof(dlcache_entry) * size);
-    
+
     return entry;
 }
 
@@ -21,14 +21,14 @@ void dlcache_entry_delete(dlcache_entry * entries)
 }
 
 void dlcache_entry_add_dl(
-    dlcache_entry * entries, 
+    dlcache_entry * entries,
     unsigned int size,
     const char * dl_name,
     void * handle)
 {
     unsigned int times = 0;
     unsigned int index = 0;
-    
+
     index = hash_string(dl_name) % size;
     while (entries[index].dl_name != NULL)
     {
@@ -42,38 +42,38 @@ void dlcache_entry_add_dl(
     entries[index].dl_name = dl_name;
     entries[index].handle = handle;
 }
-    
+
 dlcache_entry * dlcache_entry_lookup(
     dlcache_entry * entries,
     unsigned int size,
     const char * dl_name)
 {
     unsigned int times = 0;
     unsigned int index = 0;
-    
+
     index = hash_string(dl_name) % size;
     while (entries[index].dl_name != NULL)
     {
         if (strcmp(entries[index].dl_name, dl_name) == 0)
         {
             return &entries[index];
         }
-    
+
         index = (index + 1) % size;
         if (times++ > size)
         {
             return NULL;
         }
     }
-    
+
     return NULL;
 }
 
 void dlcache_entry_resize(dlcache_entry * entries, unsigned int size,
                           dlcache_entry * entries_new, unsigned int size_new)
 {
     unsigned int i = 0;
-    
+
     for (i = 0; i < size; i++)
     {
         if (entries[i].dl_name != NULL)
@@ -96,32 +96,35 @@ dlcache * dlcache_new(unsigned int size)
 {
     dlcache * cache = (dlcache *)malloc(sizeof(dlcache));
     dlcache_entry * entries = dlcache_entry_new(size);
-    void * host_handle = NULL;
-
+
     cache->size = size;
     cache->count = 0;
     cache->entries = entries;
 
+#ifndef NO_FFI
+    void * host_handle = NULL;
     host_handle = ffi_decl_get_handle("host");
     dlcache_add_dl(cache, "host", host_handle);
-
     return cache;
+#else
+    return cache;
+#endif
 }
 
 void dlcache_delete(dlcache * cache)
 {
     if (cache->entries != NULL)
     {
         unsigned int i = 0;
-        
+
         for (i = 0; i < cache->size; i++)
         {
             if (cache->entries[i].handle != NULL)
             {
                 dlclose(cache->entries[i].handle);
             }
         }
-    
+
         dlcache_entry_delete(cache->entries);
     }
     free(cache);
@@ -133,7 +136,7 @@ void dlcache_add_dl(dlcache * cache, const char * dl_name, void * handle)
     {
         return;
     }
-    
+
     dlcache_entry_add_dl(cache->entries, cache->size, dl_name, handle);
 
     cache->count++;
@@ -160,15 +163,17 @@ void * dlcache_get_handle(dlcache * cache, const char * dl_name)
     }
     else
     {
+#ifndef NO_FFI
         handle = ffi_decl_get_handle(dl_name);
         if (handle == NULL)
         {
             fprintf(stderr, "cannot open library %s\n", dl_name);
             return NULL;
         }
         dlcache_add_dl(cache, dl_name, handle);
+#endif
     }
-    
+
     return handle;
 }
 
@@ -178,10 +183,10 @@ void dlcache_resize(dlcache * cache)
     {
         unsigned int size_new = cache->size * 2;
         dlcache_entry * entries_new = dlcache_entry_new(size_new);
-        
+
         dlcache_entry_resize(cache->entries, cache->size, entries_new, size_new);
         dlcache_entry_delete(cache->entries);
-        
+
         cache->size = size_new;
         cache->entries = entries_new;
     }
@@ -190,7 +195,7 @@ void dlcache_resize(dlcache * cache)
 void dlcache_print(dlcache * cache)
 {
     unsigned int i = 0;
-    
+
     for (i = 0 ; i < cache->size; i++)
     {
         dlcache_entry_print(&cache->entries[i]);