[embedded] -O and -Osize embedded runtime

Author: kubamracek

lib/SILOptimizer/UtilityPasses/Link.cpp

@@ -39,8 +39,7 @@ class SILLinker : public SILModuleTransform {
 
     // In embedded Swift, the stdlib contains all the runtime functions needed
     // (swift_retain, etc.). Link them in so they can be referenced in IRGen.
-    if (M.getASTContext().LangOpts.hasFeature(Feature::Embedded) &&
-        !M.isStdlibModule()) {
+    if (M.getASTContext().LangOpts.hasFeature(Feature::Embedded)) {
       linkEmbeddedRuntimeFromStdlib();
     }
   }
@@ -61,6 +60,10 @@ class SILLinker : public SILModuleTransform {
 
   void linkEmbeddedRuntimeFunctionByName(StringRef name) {
     SILModule &M = *getModule();
+
+    // Bail if runtime function is already loaded.
+    if (M.lookUpFunction(name)) return;
+
     SILFunction *Fn =
         M.getSILLoader()->lookupSILFunction(name, SILLinkage::PublicExternal);
     if (!Fn) return;

stdlib/public/core/EmbeddedRuntime.swift

@@ -125,3 +125,8 @@ public func swift_once(predicate: UnsafeMutablePointer<Int>, fn: (@convention(c)
     fn(context)
   }
 }
+
+@_silgen_name("swift_deletedMethodError")
+public func swift_deletedMethodError() -> Never {
+  Builtin.int_trap()
+}

test/embedded/runtime.swift

@@ -1,4 +1,6 @@
 // RUN: %target-run-simple-swift(-enable-experimental-feature Embedded -parse-as-library -runtime-compatibility-version none -wmo -Xfrontend -disable-objc-interop) | %FileCheck %s
+// RUN: %target-run-simple-swift(-O -enable-experimental-feature Embedded -parse-as-library -runtime-compatibility-version none -wmo -Xfrontend -disable-objc-interop) | %FileCheck %s
+// RUN: %target-run-simple-swift(-Osize -enable-experimental-feature Embedded -parse-as-library -runtime-compatibility-version none -wmo -Xfrontend -disable-objc-interop) | %FileCheck %s
 
 // REQUIRES: executable_test
 // REQUIRES: optimized_stdlib