[WASM] Separate SwiftRT from ELF

Author: kateinoigakukun

stdlib/public/runtime/CMakeLists.txt

@@ -79,6 +79,7 @@ endif(LLVM_ENABLE_ASSERTIONS)
 set(LLVM_OPTIONAL_SOURCES
     SwiftRT-COFF.cpp
     SwiftRT-ELF.cpp
+    SwiftRT-WASM.cpp
     ${swift_runtime_sources}
     ${swift_runtime_objc_sources}
     ${swift_runtime_leaks_sources})

stdlib/public/runtime/SwiftRT-ELF.cpp

@@ -46,16 +46,9 @@ static swift::MetadataSections sections{};
 
 __attribute__((__constructor__))
 static void swift_image_constructor() {
-#ifndef __wasm__
 #define SWIFT_SECTION_RANGE(name)                                              \
   { reinterpret_cast<uintptr_t>(&__start_##name),                              \
     static_cast<uintptr_t>(&__stop_##name - &__start_##name) }
-#else
-// WebAssembly hack: ok this should really go in its own file
-#define SWIFT_SECTION_RANGE(name)                                              \
-  { reinterpret_cast<uintptr_t>(&__start_##name) + sizeof(void*),                              \
-    static_cast<uintptr_t>(&__stop_##name - &__start_##name - sizeof(void*)) }
-#endif
 
   sections = {
       swift::CurrentSectionMetadataVersion,

stdlib/public/runtime/SwiftRT-WASM.cpp

@@ -0,0 +1,11 @@
+//===--- SwiftRT-WASM.cpp --------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//