WebAssembly effort (#721)

backend.native/build.gradle

@@ -161,7 +161,9 @@ targetList.each { target ->
     "-Djava.library.path=${project.buildDir}/nativelibs",
     "-Dfile.encoding=UTF-8"]
 
-    def konanArgs = ['-nopack', '-nostdlib','-ea', '-g',
+    def defaultArgs = ['-nopack', '-nostdlib','-ea' ]
+    if (target != "wasm32") defaultArgs += '-g'
+    def konanArgs = [*defaultArgs,
                      '-target', target,
                      '-runtime', project(':runtime').file("build/${target}/runtime.bc"),
                      '-properties', rootProject.konanPropertiesFile.canonicalPath,

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/LinkStage.kt

@@ -169,6 +169,21 @@ internal open class MingwPlatform(distribution: Distribution)
     override fun linkCommandSuffix() = linkerKonanFlags
 }
 
+internal open class WasmPlatform(distribution: Distribution)
+    : PlatformFlags(distribution.targetProperties) {
+
+    private val clang = "clang"
+
+    override val useCompilerDriverAsLinker: Boolean get() = false
+
+    override fun linkCommand(objectFiles: List<ObjectFile>, executable: ExecutableFile, optimize: Boolean, debug: Boolean): List<String> {
+
+        return mutableListOf(clang).apply{
+            throw Error("Implement me!")
+        }
+    }
+}
+
 internal class LinkStage(val context: Context) {
 
     val config = context.config.configuration
@@ -184,6 +199,8 @@ internal class LinkStage(val context: Context) {
             AndroidPlatform(distribution)
         KonanTarget.MINGW ->
             MingwPlatform(distribution)
+        KonanTarget.WASM32 ->
+            WasmPlatform(distribution)
         else ->
             error("Unexpected target platform: ${context.config.targetManager.target}")
     }

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/Runtime.kt

@@ -43,11 +43,14 @@ class Runtime(bitcodeFile: String) {
     val target = LLVMGetTarget(llvmModule)!!.toKString()
 
     // TODO: deduce TLS model from explicit config parameter.
-    val tlsMode = if (target.indexOf("android") != -1)
-        LLVMThreadLocalMode.LLVMGeneralDynamicTLSModel else LLVMThreadLocalMode.LLVMLocalExecTLSModel
-
+    val tlsMode by lazy {
+        when {
+            target.indexOf("android") != -1 -> LLVMThreadLocalMode.LLVMGeneralDynamicTLSModel
+            target.indexOf("wasm") != -1 -> LLVMThreadLocalMode.LLVMNotThreadLocal
+            else -> LLVMThreadLocalMode.LLVMLocalExecTLSModel
+        }
+    }
     val dataLayout = LLVMGetDataLayout(llvmModule)!!.toKString()
 
     val targetData = LLVMCreateTargetData(dataLayout)!!
-
 }

backend.native/konan.properties

@@ -209,3 +209,22 @@ entrySelector.mingw = -Wl,--defsym,main=Konan_main
 dependencies.mingw = \
     msys2-mingw-w64-x86_64-gcc-6.3.0-clang-llvm-3.9.1-windows-x86-64 \
     libffi-3.2.1-mingw-w64-x86-64
+
+# WebAssembly 32-bit.
+targetToolchain.osx-wasm32 = target-toolchain-1-osx-wasm
+dependencies.osx-wasm32 = \
+    clang-llvm-3.9.0-darwin-macos \
+    target-sysroot-1-wasm \
+    target-toolchain-1-osx-wasm
+
+quadruple.wasm32 = wasm32
+entrySelector.wasm32 =  -Wl,--defsym -Wl,main=Konan_main
+llvmLtoFlags.wasm32 = -exported-symbol=Konan_main
+targetSysRoot.wasm32 = target-sysroot-1-wasm
+clangFlags.wasm32 = -O1 -fno-rtti -fno-exceptions \
+   -D_LIBCPP_ABI_VERSION=2 -DKONAN_NO_FFI=1 -DKONAN_NO_THREADS=1 -DKONAN_NO_EXCEPTIONS=1 \
+   -nostdinc -Xclang -nobuiltininc -Xclang -nostdsysteminc \
+   -Xclang -isystem<sysrootDir>/include/libcxx -Xclang -isystem<sysrootDir>/lib/libcxxabi/include \
+   -Xclang -isystem<sysrootDir>/include/compat -Xclang -isystem<sysrootDir>/include/libc
+linkerKonanFlags.wasm32 = -lc
+linkerDebugFlags.wasm32 = -Wl,-S