Get rid of _stdlib_didEnterMain

Process arguments are now fetched per-platform

include/swift/AST/KnownDecls.def

@@ -64,7 +64,6 @@ FUNC_DECL(BridgeAnyObjectToAny,
 
 FUNC_DECL(ConvertToAnyHashable, "_convertToAnyHashable")
 
-FUNC_DECL(DidEnterMain, "_stdlib_didEnterMain")
 FUNC_DECL(DiagnoseUnexpectedNilOptional, "_diagnoseUnexpectedNilOptional")
 
 FUNC_DECL(GetErrorEmbeddedNSError, "_stdlib_getErrorEmbeddedNSError")

lib/Immediate/ImmediateImpl.h

@@ -34,8 +34,10 @@ namespace swift {
 
 namespace immediate {
 
-// Returns a handle to the runtime suitable for other 'dlsym' or 'dlclose' 
+/// Returns a handle to the runtime suitable for other \c dlsym or \c dlclose
-// calls or 'NULL' if an error occurred.
+/// calls or \c null if an error occurred.
+///
+/// \param runtimeLibPath Path to search for compiler-relative stdlib dylibs.
 void *loadSwiftRuntime(StringRef runtimeLibPath);
 bool tryLoadLibraries(ArrayRef<LinkLibrary> LinkLibraries,
                       SearchPathOptions SearchPathOpts,

lib/SILGen/SILGen.cpp

@@ -1223,29 +1223,6 @@ void SILGenModule::visitTopLevelCodeDecl(TopLevelCodeDecl *td) {
   }
 }
 
-static void emitTopLevelProlog(SILGenFunction &gen, SILLocation loc) {
-  assert(gen.B.getInsertionBB()->getIterator() == gen.F.begin()
-         && "not at entry point?!");
-
-  SILBasicBlock *entry = gen.B.getInsertionBB();
-  // Create the argc and argv arguments.
-  auto &C = gen.getASTContext();
-  auto FnTy = gen.F.getLoweredFunctionType();
-  auto *argc = entry->createArgument(FnTy->getParameters()[0].getSILType());
-  auto *argv = entry->createArgument(FnTy->getParameters()[1].getSILType());
-
-  // If the standard library provides a _stdlib_didEnterMain intrinsic, call it
-  // first thing.
-  if (auto didEnterMain = C.getDidEnterMain(nullptr)) {
-    ManagedValue params[] = {
-      ManagedValue::forUnmanaged(argc),
-      ManagedValue::forUnmanaged(argv),
-    };
-    (void) gen.emitApplyOfLibraryIntrinsic(loc, didEnterMain, {}, params,
-                                           SGFContext());
-  }
-}
-
 void SILGenModule::useConformance(ProtocolConformanceRef conformanceRef) {
   // We don't need to emit dependent conformances.
   if (conformanceRef.isAbstract()) 
@@ -1308,9 +1285,13 @@ public:
       sgm.TopLevelSGF->prepareRethrowEpilog(
                                  CleanupLocation::getModuleCleanupLocation());
 
+      // Create the argc and argv arguments.
       auto PrologueLoc = RegularLocation::getModuleLocation();
       PrologueLoc.markAsPrologue();
-      emitTopLevelProlog(*sgm.TopLevelSGF, PrologueLoc);
+      auto entry = sgm.TopLevelSGF->B.getInsertionBB();
+      auto FnTy = sgm.TopLevelSGF->F.getLoweredFunctionType();
+      entry->createArgument(FnTy->getParameters()[0].getSILType());
+      entry->createArgument(FnTy->getParameters()[1].getSILType());
 
       scope.emplace(sgm.TopLevelSGF->Cleanups,
                     CleanupLocation::getModuleCleanupLocation());
@@ -1409,8 +1390,12 @@ public:
       // Assign a debug scope pointing into the void to the top level function.
       toplevel->setDebugScope(new (sgm.M) SILDebugScope(TopLevelLoc, toplevel));
 
+      // Create the argc and argv arguments.
       SILGenFunction gen(sgm, *toplevel);
-      emitTopLevelProlog(gen, mainClass);
+      auto entry = gen.B.getInsertionBB();
+      auto FnTy = gen.F.getLoweredFunctionType();
+      entry->createArgument(FnTy->getParameters()[0].getSILType());
+      entry->createArgument(FnTy->getParameters()[1].getSILType());
       gen.emitArtificialTopLevel(mainClass);
     }
   }

stdlib/public/core/CommandLine.swift

@@ -47,23 +47,3 @@ public enum CommandLine {
   public static var arguments: [String]
     = (0..<Int(argc)).map { String(cString: _unsafeArgv[$0]!) }
 }
-
-// FIXME(ABI)#25 : Remove this and the entrypoints in SILGen.
-// rdar://problem/19696522
-@_transparent
-public // COMPILER_INTRINSIC
-func _stdlib_didEnterMain(
-  argc: Int32, argv: UnsafeMutablePointer<UnsafeMutablePointer<Int8>?>
-) {
-  // Initialize the CommandLine.argc and CommandLine.unsafeArgv variables with the
-  // values that were passed in to main.
-  CommandLine._argc = Int32(argc)
-  CommandLine._unsafeArgv = argv
-}
-
-// FIXME: Move this to HashedCollections.swift.gyb
-internal class _Box<Wrapped> {
-  internal var _value: Wrapped
-  internal init(_ value: Wrapped) { self._value = value }
-}
-

test/DebugInfo/top_level_code.swift

@@ -9,6 +9,6 @@ markUsed(a+b)
 // CHECK: _main:
 // Verify that the top-level function (main) begins at line 0 and then
 // proceeds to line 6.
-// CHECK: .loc    {{[0-9]}} 0 {{[0-9]}} prologue_end
+// CHECK: .loc    {{[0-9]}} 0 {{[0-9]}} 
 // CHECK-NOT: .loc
-// CHECK: .loc    {{[0-9]}} 6 {{[0-9]}}
+// CHECK: .loc    {{[0-9]}} 6 {{[0-9]}} prologue_end

test/IRGen/enum_derived.swift

@@ -37,8 +37,8 @@ extension def_enum.TrafficLight : Error {}
 
 extension def_enum.Term : Error {}
 
-// CHECK-NORMAL-LABEL: define hidden i64 @_TFO12enum_derived7Phantomg8rawValueVs5Int64(i1, %swift.type* nocapture readnone %T) local_unnamed_addr #1
+// CHECK-NORMAL-LABEL: define hidden i64 @_TFO12enum_derived7Phantomg8rawValueVs5Int64(i1, %swift.type* nocapture readnone %T) local_unnamed_addr #0
-// CHECK-TESTABLE-LABEL: define{{( protected)?}} i64 @_TFO12enum_derived7Phantomg8rawValueVs5Int64(i1, %swift.type* nocapture readnone %T) #1
+// CHECK-TESTABLE-LABEL: define{{( protected)?}} i64 @_TFO12enum_derived7Phantomg8rawValueVs5Int64(i1, %swift.type* nocapture readnone %T) #0
 
 enum Phantom<T> : Int64 {
   case Up