WebAssembly effort (#721)

Interop/StubGenerator/src/main/kotlin/org/jetbrains/kotlin/native/interop/gen/jvm/main.kt

@@ -88,7 +88,8 @@ private val knownTargets = mapOf(
         "raspberrypi" to "raspberrypi",
         "android_arm32" to "android_arm32",
         "android_arm64" to "android_arm64",
-        "mingw" to "mingw"
+        "mingw" to "mingw",
+        "wasm32" to "wasm32"
 )
 
 
@@ -198,6 +199,12 @@ private fun maybeExecuteHelper(dependenciesRoot: String, properties: Properties,
     }
 }
 
+private fun Properties.getClangFlags(target: String, targetSysRoot: String) : List<String> {
+    val flags = getTargetSpecific("clangFlags", target)
+    if (flags == null) return emptyList()
+    return flags.replace("<sysrootDir>", targetSysRoot).split(' ')
+}
+
 private fun Properties.defaultCompilerOpts(target: String, dependencies: String): List<String> {
     val targetToolchainDir = getHostTargetSpecific("targetToolchain", target)!!
     val targetToolchain = "$dependencies/$targetToolchainDir"
@@ -224,7 +231,7 @@ private fun Properties.defaultCompilerOpts(target: String, dependencies: String)
     val arch = getTargetSpecific("arch", target)
     val archSelector = if (quadruple != null)
         listOf("-target", quadruple) else listOf("-arch", arch!!)
-    val commonArgs = listOf("-isystem", isystem, "--sysroot=$targetSysRoot")
+    val commonArgs = listOf("-isystem", isystem, "--sysroot=$targetSysRoot") + getClangFlags(target, targetSysRoot)
     when (host) {
         "osx" -> {
             val osVersionMinFlag = getTargetSpecific("osVersionMinFlagClang", target)

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

build.gradle

@@ -102,7 +102,7 @@ void loadLocalProperties() {
     if (new File("$project.rootDir/local.properties").exists()) {
         Properties props = new Properties()
         props.load(new FileInputStream("$project.rootDir/local.properties"))
-        props.each {prop -> project.ext.set(prop.key, prop.value)}
+        props.each { prop -> project.ext.set(prop.key, prop.value) }
     }
 }
 
@@ -111,11 +111,11 @@ void loadCommandLineProperties() {
         throw new Error("Specify either -Ptest_flags or -Pbuild_flags.")
     }
     ext.globalBuildArgs = project.hasProperty("build_flags")
-        ? ext.build_flags.split(' ') : []
+    ? ext.build_flags.split(' '): []
     ext.globalTestArgs = project.hasProperty("test_flags")
-        ? ext.test_flags.split(' ') : []
+    ? ext.test_flags.split(' '): []
     ext.testTarget = project.hasProperty("test_target")
-        ? ext.test_target : null
+    ? ext.test_target: null
 }
 
 class PlatformInfo {

contrib/binaryen.diff

@@ -0,0 +1,193 @@
+diff --git a/src/s2wasm.h b/src/s2wasm.h
+index 0fc0201c..c56a3a8c 100644
+--- a/src/s2wasm.h
++++ b/src/s2wasm.h
+@@ -153,9 +153,16 @@ class S2WasmBuilder {
+ 
+   Name getStr() {
+     std::string str; // TODO: optimize this and the other get* methods
+-    while (*s && !isspace(*s)) {
+-      str += *s;
+-      s++;
++    if (*s == '\"') {
++      str += *s++;
++      while (*s && *s != '\"') {
++        str += *s++;
++      }
++      if (*s == '\"') str += *s++;
++    } else {
++      while (*s && !isspace(*s)) {
++        str += *s++;
++      }
+     }
+     return cashew::IString(str.c_str(), false);
+   }
+@@ -168,6 +175,11 @@ class S2WasmBuilder {
+ 
+   Name getStrToSep() {
+     std::string str;
++    if (*s == '\"') {
++      str += *s++;
++      while (*s && *s != '\"') str += *s++;
++      if (*s == '\"') str += *s++;
++    }
+     while (*s && !isspace(*s) && *s != ',' && *s != '(' && *s != ')' && *s != ':' && *s != '+' && *s != '-' && *s != '=') {
+       str += *s;
+       s++;
+@@ -177,10 +189,15 @@ class S2WasmBuilder {
+ 
+   Name getStrToColon() {
+     std::string str;
+-    while (*s && !isspace(*s) && *s != ':') {
+-      str += *s;
+-      s++;
++    if (*s == '\"') {
++      str += *s++;
++      while (*s && *s != '\"') {
++        str += *s++;
++      }
++      if (*s == '\"') str += *s++;
+     }
++    while (*s && !isspace(*s) && *s != ':')
++      str += *s++;
+     return cashew::IString(str.c_str(), false);
+   }
+ 
+@@ -330,9 +347,18 @@ class S2WasmBuilder {
+   Name getSeparated(char separator) {
+     skipWhitespace();
+     std::string str;
+-    while (*s && *s != separator && *s != '\n') {
+-      str += *s;
+-      s++;
++    bool inQuoted = false;
++    int inBrackets = 0;
++    while (*s && (*s != separator || inQuoted || inBrackets > 0) && *s != '\n') {
++      if (*s == '\"') {
++        inQuoted = !inQuoted;
++      } else if (*s == '(') {
++        inBrackets++;
++      } else if (*s == ')') {
++        inBrackets--;
++      }
++
++      str += *s++;
+     }
+     skipWhitespace();
+     return cashew::IString(str.c_str(), false);
+@@ -421,14 +447,32 @@ class S2WasmBuilder {
+   bool isFunctionName(Name name) {
+     return !!strstr(name.str, "@FUNCTION");
+   }
+-  // Drop the @ and after it.
+-  Name cleanFunction(Name name) {
+-    if (!strchr(name.str, '@')) return name;
++
++  Name cleanName(Name name, char terminator = 0) {
+     char *temp = strdup(name.str);
+-    *strchr(temp, '@') = 0;
++    static const char* bads  = "\";<>() ";
++    static const char* goods = "\'$__$$$";
++    int index = 0;
++    while (bads[index] != 0) {
++        char *pos = temp;
++        while ((pos = strchr(pos, bads[index])) != nullptr) {
++          *pos = goods[index];
++          pos++;
++        }
++        index++;
++    }
++    if (terminator != 0) {
++      char* pos = strrchr(temp, terminator);
++      if (pos != nullptr) *pos = '\0';
++    }
+     Name ret = cashew::IString(temp, false);
+     free(temp);
+     return ret;
++   }
++
++  // Drop the @ and after it.
++  Name cleanFunction(Name name) {
++    return cleanName(name, '@');
+   }
+ 
+   // processors
+@@ -446,7 +490,7 @@ class S2WasmBuilder {
+         if (match(".hidden")) mustMatch(name.str);
+         mustMatch(name.str);
+         if (match(":")) {
+-          info->implementedFunctions.insert(name);
++          info->implementedFunctions.insert(cleanName(name));
+         } else if (match("=")) {
+           Name alias = getAtSeparated();
+           mustMatch("@FUNCTION");
+@@ -461,7 +505,7 @@ class S2WasmBuilder {
+         s = strchr(s, '\n');
+       } else {
+         // add data aliases
+-        Name lhs = getStrToSep();
++        Name lhs = cleanName(getStrToSep());
+         // When the current line contains only one word, e.g.".text"
+         if (match("\n"))
+           continue;
+@@ -473,7 +517,7 @@ class S2WasmBuilder {
+         }
+ 
+         // get the original name
+-        Name rhs = getStrToSep();
++        Name rhs = cleanName(getStrToSep());
+         assert(!isFunctionName(rhs));
+         Offset offset = 0;
+         if (*s == '+') {
+@@ -620,7 +664,7 @@ class S2WasmBuilder {
+   }
+ 
+   void parseGlobl() {
+-    linkerObj->addGlobal(getStr());
++    linkerObj->addGlobal(cleanName(getStr()));
+     skipWhitespace();
+   }
+ 
+@@ -753,7 +797,7 @@ class S2WasmBuilder {
+         skipWhitespace();
+       } else break;
+     }
+-    Function* func = builder.makeFunction(name, std::move(params), resultType, std::move(vars));
++    Function* func = builder.makeFunction(cleanName(name), std::move(params), resultType, std::move(vars));
+ 
+     // parse body
+     func->body = allocator->alloc<Block>();
+@@ -1343,6 +1387,11 @@ class S2WasmBuilder {
+       mustMatch(name.str);
+       skipWhitespace();
+     }
++    if (match(".weak")) {
++      // Do nothing special on weak symbols so far.
++      mustMatch(name.str);
++      skipWhitespace();
++    }
+     if (match(".align") || match(".p2align")) {
+       align = getInt();
+       skipWhitespace();
+@@ -1436,9 +1485,10 @@ class S2WasmBuilder {
+       r->data = (uint32_t*)&raw[i];
+     }
+     // assign the address, add to memory
+-    linkerObj->addStatic(size, align, name);
++    Name wasmName = cleanName(name);
++    linkerObj->addStatic(size, align, wasmName);
+     if (!zero) {
+-      linkerObj->addSegment(name, raw);
++      linkerObj->addSegment(wasmName, raw);
+     }
+   }
+ 
+@@ -1451,7 +1501,7 @@ class S2WasmBuilder {
+       skipComma();
+       localAlign = 1 << getInt();
+     }
+-    linkerObj->addStatic(size, std::max(align, localAlign), name);
++    linkerObj->addStatic(size, std::max(align, localAlign), cleanName(name));
+   }
+ 
+   void skipImports() {

dependencies/build.gradle

@@ -227,13 +227,18 @@ if (isLinux()) {
     }
 
     dependencyTask(MINGW, LIBFFI)
-} else {
+} else if (isMac()) {
     dependencyTask(MACBOOK, SYSROOT)
     dependencyTask(MACBOOK, LIBFFI)
     dependencyTask(IPHONE, SYSROOT)
     dependencyTask(IPHONE, LIBFFI)
+    dependencyTask(WASM32, SYSROOT)
+    // No FFI for webassembly.
+
     // TODO: re-enable when we known how to bring the simulator sysroot to dependencies.
-    // dependencyTask(IPHONE_SIM, SYSROOT)
+    // dependencyTask("iphoneSim", SYSROOT)
+} else {
+    throw new Error("Unsupported host")
 }
 
 if (isLinux() || isMac()) {

runtime/build.gradle

@@ -27,7 +27,8 @@ targetList.each { targetName ->
         target targetName
         compilerArgs '-g'
         compilerArgs '-I' + project.file('../common/src/hash/headers')
-        compilerArgs '-I' + project.file(rootProject.ext.get("${targetName}LibffiDir") + "/include")
+        if (rootProject.hasProperty("${targetName}LibffiDir"))
+            compilerArgs '-I' + project.file(rootProject.ext.get("${targetName}LibffiDir") + "/include")
         linkerArgs project.file("../common/build/$targetName/hash.bc").path
     }
 }

runtime/src/main/cpp/Common.h

@@ -20,5 +20,10 @@
 #define RUNTIME_NOTHROW __attribute__((nothrow))
 #define RUNTIME_CONST __attribute__((const))
 #define RUNTIME_PURE __attribute__((pure))
+#if KONAN_NO_THREADS
+#define THREAD_LOCAL_VARIABLE
+#else
+#define THREAD_LOCAL_VARIABLE __thread
+#endif
 
 #endif // RUNTIME_COMMON_H

runtime/src/main/cpp/Console.cpp

@@ -30,7 +30,7 @@ void Kotlin_io_Console_print(KString message) {
   // TODO: system stdout must be aware about UTF-8.
   const KChar* utf16 = CharArrayAddressOfElementAt(message, 0);
   KStdString utf8;
-  utf8::utf16to8(utf16, utf16 + message->count_, back_inserter(utf8));
+  utf8::unchecked::utf16to8(utf16, utf16 + message->count_, back_inserter(utf8));
   konan::consoleWriteUtf8(utf8.c_str(), utf8.size());
 }
 

runtime/src/main/cpp/Exceptions.cpp

@@ -17,6 +17,10 @@
 #include <stdlib.h>
 #include <string.h>
 #include <stdint.h>
+
+#if KONAN_NO_EXCEPTIONS
+#define OMIT_BACKTRACE 1
+#endif
 #ifndef OMIT_BACKTRACE
 #if USE_GCC_UNWIND
 // GCC unwinder for backtrace.
@@ -54,7 +58,7 @@ class AutoFree {
 struct Backtrace {
   Backtrace(int count, int skip) : index(0), skipCount(skip) {
     auto result = AllocArrayInstance(
-	theArrayTypeInfo, count - skipCount, arrayHolder.slot());
+        theArrayTypeInfo, count - skipCount, arrayHolder.slot());
     // TODO: throw cached OOME?
     RuntimeAssert(result != nullptr, "Cannot create backtrace array");
   }
@@ -156,8 +160,10 @@ OBJ_GETTER0(GetCurrentStackTrace) {
 
 void ThrowException(KRef exception) {
   RuntimeAssert(exception != nullptr && IsInstance(exception, theThrowableTypeInfo),
-		"Throwing something non-throwable");
-
+                "Throwing something non-throwable");
+#if KONAN_NO_EXCEPTIONS
+  RuntimeAssert(false, "Exceptions unsupported");
+#else
 #if (__MINGW32__ || __MINGW64__)
   // Workaround for https://bugs.llvm.org/show_bug.cgi?id=33220
   // This code forces the function to have at least one landingpad:
@@ -165,6 +171,7 @@ void ThrowException(KRef exception) {
 #endif
 
   throw ObjHolder(exception);
+#endif
 }
 
 

runtime/src/main/cpp/Interop.cpp

@@ -17,14 +17,20 @@
 #include <assert.h>
 #include <stdio.h>
 #include <stdint.h>
+
+#ifndef KONAN_NO_FFI
 #include <ffi.h>
+#endif
 
 #include "Memory.h"
 #include "Types.h"
 
+
 namespace {
 
 typedef int FfiTypeKind;
+
+#ifndef KONAN_NO_FFI
 // Also declared in Varargs.kt
 const FfiTypeKind FFI_TYPE_KIND_VOID = 0;
 const FfiTypeKind FFI_TYPE_KIND_SINT8 = 1;
@@ -49,6 +55,7 @@ ffi_type* convertFfiTypeKindToType(FfiTypeKind typeKind) {
         default: assert(false); return nullptr;
     }
 }
+#endif  // KONAN_NO_FFI
 
 }  // namespace
 
@@ -57,8 +64,9 @@ extern "C" {
 void Kotlin_Interop_callWithVarargs(void* codePtr, void* returnValuePtr, FfiTypeKind returnTypeKind,
                      void** arguments, intptr_t* argumentTypeKinds,
                      int fixedArgumentsNumber, int totalArgumentsNumber) {
-
-
+#ifdef KONAN_NO_FFI
+    RuntimeAssert(false, "Vararg calls are not supported on this platform");
+#else
     ffi_type** argumentTypes = (ffi_type**)argumentTypeKinds;
     // In-place convertion:
     for (int i = 0; i < totalArgumentsNumber; ++i) {
@@ -71,6 +79,7 @@ void Kotlin_Interop_callWithVarargs(void* codePtr, void* returnValuePtr, FfiType
                      convertFfiTypeKindToType(returnTypeKind), argumentTypes);
 
     ffi_call(&cif, (void (*)())codePtr, returnValuePtr, arguments);
+#endif
 }
 
 KNativePtr Kotlin_Interop_createStablePointer(KRef any) {

runtime/src/main/cpp/KString.cpp

@@ -38,12 +38,12 @@
 namespace {
 
 OBJ_GETTER(utf8ToUtf16, const char* rawString, size_t rawStringLength) {
-  uint32_t charCount = utf8::distance(rawString, rawString + rawStringLength);
+  uint32_t charCount = utf8::unchecked::distance(rawString, rawString + rawStringLength);
   ArrayHeader* result = AllocArrayInstance(
     theStringTypeInfo, charCount, OBJ_RESULT)->array();
   KChar* rawResult = CharArrayAddressOfElementAt(result, 0);
   auto convertResult =
-      utf8::utf8to16(rawString, rawString + rawStringLength, rawResult);
+      utf8::unchecked::utf8to16(rawString, rawString + rawStringLength, rawResult);
   RETURN_OBJ(result->obj());
 }
 
@@ -738,7 +738,7 @@ OBJ_GETTER(Kotlin_String_toUtf8Array, KString thiz, KInt start, KInt size) {
   }
   const KChar* utf16 = CharArrayAddressOfElementAt(thiz, start);
   KStdString utf8;
-  utf8::utf16to8(utf16, utf16 + size, back_inserter(utf8));
+  utf8::unchecked::utf16to8(utf16, utf16 + size, back_inserter(utf8));
   ArrayHeader* result = AllocArrayInstance(
       theByteArrayTypeInfo, utf8.size() + 1, OBJ_RESULT)->array();
   ::memcpy(ByteArrayAddressOfElementAt(result, 0), utf8.c_str(), utf8.size());

runtime/src/main/cpp/Memory.cpp

@@ -94,7 +94,7 @@ struct MemoryState {
 namespace {
 
 // TODO: can we pass this variable as an explicit argument?
-__thread MemoryState* memoryState = nullptr;
+THREAD_LOCAL_VARIABLE MemoryState* memoryState = nullptr;
 
 inline bool isFreeable(const ContainerHeader* header) {
   return (header->refCount_ & CONTAINER_TAG_MASK) < CONTAINER_TAG_PERMANENT;
@@ -649,6 +649,13 @@ OBJ_GETTER(InitInstance,
 
   ObjHeader* object = AllocInstance(type_info, OBJ_RESULT);
   UpdateRef(location, object);
+#if KONAN_NO_EXCEPTIONS
+  ctor(object);
+#if TRACE_MEMORY
+  memoryState->globalObjects->push_back(location);
+#endif
+  return object;
+#else
   try {
     ctor(object);
 #if TRACE_MEMORY
@@ -660,6 +667,7 @@ OBJ_GETTER(InitInstance,
     UpdateRef(location, nullptr);
     throw;
   }
+#endif
 }
 
 void SetRef(ObjHeader** location, const ObjHeader* object) {
@@ -882,7 +890,9 @@ OBJ_GETTER(DerefStablePointer, KNativePtr pointer) {
 }
 
 OBJ_GETTER(AdoptStablePointer, KNativePtr pointer) {
+#ifndef KONAN_NO_THREADS
   __sync_synchronize();
+#endif
   KRef ref = reinterpret_cast<KRef>(pointer);
   // Somewhat hacky.
   *OBJ_RESULT = ref;

runtime/src/main/cpp/Types.h

@@ -17,6 +17,13 @@
 #ifndef RUNTIME_TYPES_H
 #define RUNTIME_TYPES_H
 
+#include <stdlib.h>
+
+#if KONAN_WASM
+// assert() is needed by WASM STL.
+#define assert(cond) if (!(cond)) abort()
+#endif
+
 #include <deque>
 #include <string>
 #include <unordered_map>

runtime/src/main/cpp/Worker.cpp

@@ -13,7 +13,10 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-#define WITH_WORKERS 1
+
+#ifndef KONAN_NO_THREADS
+# define WITH_WORKERS 1
+#endif
 
 #include <stdlib.h>
 #include <string.h>
@@ -462,6 +465,11 @@ KInt stateOfFuture(KInt id) {
   return 0;
 }
 
+KInt schedule(KInt id, KInt transferMode, KRef producer, KNativePtr jobFunction) {
+  ThrowWorkerUnsupported();
+  return 0;
+}
+
 OBJ_GETTER(consumeFuture, KInt id) {
   ThrowWorkerUnsupported();
   RETURN_OBJ(nullptr);

runtime/src/main/cpp/dlmalloc/malloc.cpp

@@ -525,7 +525,9 @@ MAX_RELEASE_CHECK_RATE   default: 4095 unless not HAVE_MMAP
 
 /**** Start of Konan-specific dlmalloc configuration. ****/
 #define USE_DL_PREFIX 1
+#if !KONAN_WASM
 #define USE_LOCKS 1
+#endif
 #define DLMALLOC_EXPORT extern "C"
 #define HAVE_MORECORE 1
 #define MORECORE konan::moreCore

runtime/src/main/cpp/dtoa/dblparse.cpp

@@ -642,7 +642,7 @@ KDouble Konan_FloatingPointParser_parseDoubleImpl (KString s, KInt e)
 {
   const KChar* utf16 = CharArrayAddressOfElementAt(s, 0);
   KStdString utf8;
-  utf8::utf16to8(utf16, utf16 + s->count_, back_inserter(utf8));
+  utf8::unchecked::utf16to8(utf16, utf16 + s->count_, back_inserter(utf8));
   const char *str = utf8.c_str();
   auto dbl = createDouble (str, e);
 

runtime/src/main/cpp/dtoa/fltparse.cpp

@@ -549,7 +549,7 @@ Konan_FloatingPointParser_parseFloatImpl (KString s, KInt e)
 {
   const KChar* utf16 = CharArrayAddressOfElementAt(s, 0);
   KStdString utf8;
-  utf8::utf16to8(utf16, utf16 + s->count_, back_inserter(utf8));
+  utf8::unchecked::utf16to8(utf16, utf16 + s->count_, back_inserter(utf8));
   const char *str = utf8.c_str();
   auto flt = createFloat (str, e);
 

runtime/src/main/cpp/utf8.h

@@ -28,7 +28,6 @@ DEALINGS IN THE SOFTWARE.
 #ifndef UTF8_FOR_CPP_2675DCD0_9480_4c0c_B92A_CC14C027B731
 #define UTF8_FOR_CPP_2675DCD0_9480_4c0c_B92A_CC14C027B731
 
-#include "utf8/checked.h"
 #include "utf8/unchecked.h"
 
 #endif // header guard

shared/src/main/kotlin/org/jetbrains/kotlin/konan/target/ClangArgs.kt

@@ -19,16 +19,15 @@ package org.jetbrains.kotlin.konan.target
 import org.jetbrains.kotlin.konan.properties.KonanProperties
 import org.jetbrains.kotlin.konan.file.File
 
-class ClangTarget(val target: KonanTarget, val konanProperties: KonanProperties) {
+class ClangTarget(val target: KonanTarget, konanProperties: KonanProperties) {
 
-    val sysRoot = konanProperties.absoluteTargetSysRoot!!
+    val sysRoot = konanProperties.absoluteTargetSysRoot
     val targetArg = konanProperties.targetArg
 
     val specificClangArgs: List<String> get() {
-        return when (target) {
-
+        val result = when (target) {
             KonanTarget.LINUX ->
-                listOf("--sysroot=$sysRoot", 
+                listOf("--sysroot=$sysRoot",
                         "-DUSE_GCC_UNWIND=1", "-DUSE_ELF_SYMBOLS=1", "-DELFSIZE=64")
             KonanTarget.RASPBERRYPI ->
                 listOf("-target", targetArg!!,
@@ -67,7 +66,16 @@ class ClangTarget(val target: KonanTarget, val konanProperties: KonanProperties)
                         // HACKS!
                         "-I$sysRoot/usr/include/c++/4.9.x",
                         "-I$sysRoot/usr/include/c++/4.9.x/aarch64-linux-android")
+
+            KonanTarget.WASM32 ->
+                listOf("-target", targetArg!!, "-O1", "-fno-rtti", "-fno-exceptions",  "-DKONAN_WASM=1",
+                        "-D_LIBCPP_ABI_VERSION=2", "-DKONAN_NO_FFI=1", "-DKONAN_NO_THREADS=1", "-DKONAN_NO_EXCEPTIONS=1",
+                        "-DKONAN_INTERNAL_DLMALLOC=1",
+                        "-nostdinc", "-Xclang", "-nobuiltininc", "-Xclang", "-nostdsysteminc",
+                        "-Xclang", "-isystem$sysRoot/include/libcxx", "-Xclang", "-isystem$sysRoot/lib/libcxxabi/include",
+                        "-Xclang", "-isystem$sysRoot/include/compat", "-Xclang", "-isystem$sysRoot/include/libc")
         }
+        return result + (if (target != KonanTarget.WASM32) listOf("-g") else emptyList())
     }
 }
 

shared/src/main/kotlin/org/jetbrains/kotlin/konan/target/KonanTarget.kt

@@ -24,7 +24,9 @@ enum class KonanTarget(val targetSuffix: String, val programSuffix: String, var
     LINUX("linux", "kexe"),
     MINGW("mingw", "exe"),
     MACBOOK("osx", "kexe"),
-    RASPBERRYPI("raspberrypi", "kexe");
+    RASPBERRYPI("raspberrypi", "kexe"),
+    WASM32("wasm32", "kexe");
+
     val userName get() = name.toLowerCase()
 }
 
@@ -115,7 +117,7 @@ class TargetManager(val userRequest: String? = null) {
                 else -> throw TargetSupportException("Unknown host: $host.")
             }
 
-        fun host_arch(): String { 
+        fun host_arch(): String {
             val javaArch = System.getProperty("os.arch")
             return when (javaArch) {
                 "x86_64" -> "x86_64"
@@ -153,6 +155,7 @@ class TargetManager(val userRequest: String? = null) {
                     //KonanTarget.IPHONE_SIM.enabled = true
                     KonanTarget.ANDROID_ARM32.enabled = true
                     KonanTarget.ANDROID_ARM64.enabled = true
+                    KonanTarget.WASM32.enabled = true
                 }
                 else ->
                     throw TargetSupportException("Unknown host platform: $host")