Merge pull request swiftlang#40113 from nkcsgexi/flag-downgrade-module-verification-error

Author: nkcsgexi

include/swift/Frontend/FrontendOptions.h

@@ -333,6 +333,11 @@ class FrontendOptions {
   /// skip nodes entirely, depending on the errors involved.
   bool AllowModuleWithCompilerErrors = false;
 
+  /// Downgrade all errors emitted in the module interface verification phase
+  /// to warnings.
+  /// TODO: remove this after we fix all project-side warnings in the interface.
+  bool DowngradeInterfaceVerificationError = false;
+
   /// True if the "-static" option is set.
   bool Static = false;
 

include/swift/Frontend/ModuleInterfaceLoader.h

@@ -299,12 +299,14 @@ struct ModuleInterfaceLoaderOptions {
   bool disableInterfaceLock = false;
   bool disableImplicitSwiftModule = false;
   bool disableBuildingInterface = false;
+  bool downgradeInterfaceVerificationError = false;
   std::string mainExecutablePath;
   ModuleInterfaceLoaderOptions(const FrontendOptions &Opts):
     remarkOnRebuildFromInterface(Opts.RemarkOnRebuildFromModuleInterface),
     disableInterfaceLock(Opts.DisableInterfaceFileLock),
     disableImplicitSwiftModule(Opts.DisableImplicitModules),
     disableBuildingInterface(Opts.DisableBuildingInterface),
+    downgradeInterfaceVerificationError(Opts.DowngradeInterfaceVerificationError),
     mainExecutablePath(Opts.MainExecutablePath)
   {
     switch (Opts.RequestedAction) {

include/swift/Option/FrontendOptions.td

@@ -562,6 +562,9 @@ def warn_long_expression_type_checking_EQ : Joined<["-"], "warn-long-expression-
 def Rmodule_interface_rebuild : Flag<["-"], "Rmodule-interface-rebuild">,
   HelpText<"Emits a remark if an imported module needs to be re-compiled from its module interface">;
 
+def downgrade_typecheck_interface_error : Flag<["-"], "downgrade-typecheck-interface-error">,
+  HelpText<"Downgrade error to warning when typechecking emitted module interfaces">;
+
 def enable_volatile_modules : Flag<["-"], "enable-volatile-modules">,
   HelpText<"Load Swift modules in memory">;
 

lib/Frontend/ArgsToFrontendOptionsConverter.cpp

@@ -141,6 +141,8 @@ bool ArgsToFrontendOptionsConverter::convert(
   Opts.RemarkOnRebuildFromModuleInterface |=
     Args.hasArg(OPT_Rmodule_interface_rebuild);
 
+  Opts.DowngradeInterfaceVerificationError |=
+    Args.hasArg(OPT_downgrade_typecheck_interface_error);
   computePrintStatsOptions();
   computeDebugTimeOptions();
   computeTBDOptions();

lib/Frontend/ModuleInterfaceBuilder.cpp

@@ -36,6 +36,7 @@
 #include "llvm/Support/Regex.h"
 #include "llvm/Support/StringSaver.h"
 #include "llvm/Support/LockFileManager.h"
+#include "llvm/ADT/STLExtras.h"
 
 using namespace swift;
 using FileDependency = SerializationOptions::FileDependency;
@@ -152,6 +153,32 @@ bool ModuleInterfaceBuilder::collectDepsForSerialization(
   return false;
 }
 
+struct ErrorDowngradeConsumerRAII: DiagnosticConsumer {
+  DiagnosticEngine &Diag;
+  std::vector<DiagnosticConsumer *> allConsumers;
+  bool SeenError;
+  ErrorDowngradeConsumerRAII(DiagnosticEngine &Diag): Diag(Diag),
+      allConsumers(Diag.takeConsumers()), SeenError(false) {
+    Diag.addConsumer(*this);
+  }
+  ~ErrorDowngradeConsumerRAII() {
+    for (auto *consumer: allConsumers) {
+      Diag.addConsumer(*consumer);
+    }
+    Diag.removeConsumer(*this);
+  }
+  void handleDiagnostic(SourceManager &SM, const DiagnosticInfo &Info) override {
+    DiagnosticInfo localInfo(Info);
+    if (localInfo.Kind == DiagnosticKind::Error) {
+      localInfo.Kind = DiagnosticKind::Warning;
+      SeenError = true;
+      for (auto *consumer: allConsumers) {
+        consumer->handleDiagnostic(SM, localInfo);
+      }
+    }
+  }
+};
+
 bool ModuleInterfaceBuilder::buildSwiftModuleInternal(
     StringRef OutPath, bool ShouldSerializeDeps,
     std::unique_ptr<llvm::MemoryBuffer> *ModuleBuffer,
@@ -204,6 +231,12 @@ bool ModuleInterfaceBuilder::buildSwiftModuleInternal(
     LLVM_DEBUG(llvm::dbgs() << "Setting up instance to compile "
                << InPath << " to " << OutPath << "\n");
 
+    LLVM_DEBUG(llvm::dbgs() << "Performing sema\n");
+    if (isTypeChecking && FEOpts.DowngradeInterfaceVerificationError) {
+      ErrorDowngradeConsumerRAII R(SubInstance.getDiags());
+      SubInstance.performSema();
+      return std::error_code();
+    }
     SWIFT_DEFER {
       // Make sure to emit a generic top-level error if a module fails to
       // load. This is not only good for users; it also makes sure that we've
@@ -225,12 +258,14 @@ bool ModuleInterfaceBuilder::buildSwiftModuleInternal(
       }
     };
 
-    LLVM_DEBUG(llvm::dbgs() << "Performing sema\n");
     SubInstance.performSema();
     if (SubInstance.getASTContext().hadError()) {
       LLVM_DEBUG(llvm::dbgs() << "encountered errors\n");
       return std::make_error_code(std::errc::not_supported);
     }
+    // If we are just type-checking the interface, we are done.
+    if (isTypeChecking)
+      return std::error_code();
 
     SILOptions &SILOpts = subInvocation.getSILOptions();
     auto Mod = SubInstance.getMainModule();
@@ -268,9 +303,6 @@ bool ModuleInterfaceBuilder::buildSwiftModuleInternal(
     SerializationOpts.IsOSSA = SILOpts.EnableOSSAModules;
 
     SILMod->setSerializeSILAction([&]() {
-      if (isTypeChecking)
-        return;
-
       // We don't want to serialize module docs in the cache -- they
       // will be serialized beside the interface file.
       serializeToBuffers(Mod, SerializationOpts, ModuleBuffer,

lib/Frontend/ModuleInterfaceLoader.cpp

@@ -1497,7 +1497,9 @@ InterfaceSubContextDelegateImpl::InterfaceSubContextDelegateImpl(
   if (LoaderOpts.remarkOnRebuildFromInterface) {
     GenericArgs.push_back("-Rmodule-interface-rebuild");
   }
-
+  // This flag only matters when we are verifying an textual interface.
+  frontendOpts.DowngradeInterfaceVerificationError =
+    LoaderOpts.downgradeInterfaceVerificationError;
   // Note that we don't assume cachePath is the same as the Clang
   // module cache path at this point.
   if (buildModuleCacheDirIfAbsent && !moduleCachePath.empty())

test/ModuleInterface/downgrade-module-verification-error.swift

@@ -0,0 +1,9 @@
+// RUN: %empty-directory(%t)
+// RUN: echo "// swift-interface-format-version: 1.0" > %t/Main.swiftinterface
+// RUN: echo "// swift-module-flags: -module-name Foo" >> %t/Main.swiftinterface
+// RUN: echo "malfunctioned" >> %t/Main.swiftinterface
+// RUN: %target-swift-frontend -typecheck-module-from-interface %t/Main.swiftinterface -module-name Foo -downgrade-typecheck-interface-error &> %t/results.txt
+// RUN: %FileCheck --input-file %t/results.txt %s
+
+// CHECK: warning:
+// CHECK-NOT: error: