[Dependency Scanning] Disable validation of Swift dependency modules' existing pre-built candidate binary module files in the scanner, on a non-caching build.

As-is, this default interferes with the incremental build machinery which conservatively assumes that binary module dependencies must cause dependents to be re-built.

Author: artemcm

Diff for: include/swift/AST/SearchPathOptions.h

@@ -542,8 +542,9 @@ class SearchPathOptions {
   /// Specify the module loading behavior of the compilation.
   ModuleLoadingMode ModuleLoadMode = ModuleLoadingMode::PreferSerialized;
 
-  /// Legacy scanner search behavior.
-  bool NoScannerModuleValidation = false;
+  /// New scanner search behavior. Validate up-to-date existing Swift module
+  /// dependencies in the scanner itself.
+  bool ScannerModuleValidation = false;
 
   /// Return all module search paths that (non-recursively) contain a file whose
   /// name is in \p Filenames.
@@ -593,7 +594,7 @@ class SearchPathOptions {
                         hash_combine_range(RuntimeLibraryImportPaths.begin(),
                                            RuntimeLibraryImportPaths.end()),
                         DisableModulesValidateSystemDependencies,
-                        NoScannerModuleValidation,
+                        ScannerModuleValidation,
                         ModuleLoadMode);
   }
 

Diff for: include/swift/Option/FrontendOptions.td

@@ -1386,6 +1386,8 @@ def disable_sending_args_and_results_with_region_isolation : Flag<["-"],
   HelpText<"Disable sending args and results when region based isolation is enabled. Only enabled with asserts">,
   Flags<[HelpHidden]>;
 
+def scanner_module_validation: Flag<["-"], "scanner-module-validation">,
+    HelpText<"Validate binary modules in the dependency scanner">;
 def no_scanner_module_validation: Flag<["-"], "no-scanner-module-validation">,
     HelpText<"Do not validate binary modules in scanner and delegate the validation to swift-frontend">;
 def module_load_mode: Separate<["-"], "module-load-mode">,

Diff for: lib/Frontend/CompilerInvocation.cpp

@@ -2005,6 +2005,7 @@ static bool validateSwiftModuleFileArgumentAndAdd(const std::string &swiftModule
 
 static bool ParseSearchPathArgs(SearchPathOptions &Opts, ArgList &Args,
                                 DiagnosticEngine &Diags,
+                                const CASOptions &CASOpts,
                                 StringRef workingDirectory) {
   using namespace options;
   namespace path = llvm::sys::path;
@@ -2148,8 +2149,10 @@ static bool ParseSearchPathArgs(SearchPathOptions &Opts, ArgList &Args,
     Opts.ScannerPrefixMapper.push_back(Opt.str());
   }
 
-  Opts.NoScannerModuleValidation |=
-      Args.hasArg(OPT_no_scanner_module_validation);
+  // rdar://132340493 disable scanner-side validation for non-caching builds
+  Opts.ScannerModuleValidation |= Args.hasFlag(OPT_scanner_module_validation,
+                                               OPT_no_scanner_module_validation,
+                                               CASOpts.EnableCaching);
 
   std::optional<std::string> forceModuleLoadingMode;
   if (auto *A = Args.getLastArg(OPT_module_load_mode))
@@ -3556,7 +3559,7 @@ bool CompilerInvocation::parseArgs(
   ParseSymbolGraphArgs(SymbolGraphOpts, ParsedArgs, Diags, LangOpts);
 
   if (ParseSearchPathArgs(SearchPathOpts, ParsedArgs, Diags,
-                          workingDirectory)) {
+                          CASOpts, workingDirectory)) {
     return true;
   }
 

Diff for: lib/Frontend/ModuleInterfaceLoader.cpp

@@ -1403,7 +1403,7 @@ ModuleInterfaceCheckerImpl::getCompiledModuleCandidatesForInterface(
 
   auto validateModule = [&](StringRef modulePath) {
     // Legacy behavior do not validate module.
-    if (Ctx.SearchPathOpts.NoScannerModuleValidation)
+    if (!Ctx.SearchPathOpts.ScannerModuleValidation)
       return true;
 
     // If we picked the other module already, no need to validate this one since
@@ -1922,8 +1922,7 @@ InterfaceSubContextDelegateImpl::InterfaceSubContextDelegateImpl(
       searchPathOpts.PluginSearchOpts;
 
   // Get module loading behavior options.
-  genericSubInvocation.getSearchPathOptions().NoScannerModuleValidation =
-      searchPathOpts.NoScannerModuleValidation;
+  genericSubInvocation.getSearchPathOptions().ScannerModuleValidation = searchPathOpts.ScannerModuleValidation;
   genericSubInvocation.getSearchPathOptions().ModuleLoadMode =
       searchPathOpts.ModuleLoadMode;
 

Diff for: lib/Serialization/ScanningLoaders.cpp

@@ -160,7 +160,7 @@ SwiftModuleScanner::scanInterfaceFile(Twine moduleInterfacePath,
         auto compiledCandidates =
             getCompiledCandidates(Ctx, realModuleName.str(), InPath);
         if (!compiledCandidates.empty() &&
-            !Ctx.SearchPathOpts.NoScannerModuleValidation) {
+            Ctx.SearchPathOpts.ScannerModuleValidation) {
           assert(compiledCandidates.size() == 1 &&
                  "Should only have 1 candidate module");
           auto BinaryDep = scanModuleFile(compiledCandidates[0], isFramework,

Diff for: lib/Serialization/SerializedModuleLoader.cpp

@@ -455,7 +455,7 @@ SerializedModuleLoaderBase::scanModuleFile(Twine modulePath, bool isFramework,
       isRequiredOSSAModules(), Ctx.LangOpts.SDKName,
       Ctx.SearchPathOpts.DeserializedPathRecoverer, loadedModuleFile);
 
-  if (!Ctx.SearchPathOpts.NoScannerModuleValidation) {
+  if (Ctx.SearchPathOpts.ScannerModuleValidation) {
     // If failed to load, just ignore and return do not found.
     if (loadInfo.status != serialization::Status::Valid) {
       if (Ctx.LangOpts.EnableModuleLoadingRemarks)

Diff for: test/ScanDependencies/compiled_swift_modules.swift

@@ -10,7 +10,7 @@ import Foo
 
 // HAS_BINARY: "swiftPrebuiltExternal": "Foo"
 
-// HAS_NO_COMPILED-NOT: "{{.*}}Foo.swiftmodule{{.*}}.swiftmodule"
+// HAS_NO_COMPILED-NOT: "compiledModulePath":{{.*}}"{{.*}}Foo.swiftmodule{{.*}}.swiftmodule"
 
 // Step 1: build swift interface and swift module side by side
 // RUN: %target-swift-frontend -emit-module %t/Foo.swift -emit-module-path %t/Foo.swiftmodule/%target-swiftmodule-name -module-name Foo -emit-module-interface-path %t/Foo.swiftmodule/%target-swiftinterface-name
@@ -20,7 +20,7 @@ import Foo
 // RUN: %validate-json %t/deps.json | %FileCheck %s -check-prefix=HAS_COMPILED
 
 /// Check scanner picked binary dependency if not requesting raw scan output.
-// RUN: %target-swift-frontend -scan-dependencies %s -o %t/deps.json -I %t -emit-dependencies -emit-dependencies-path %t/deps.d
+// RUN: %target-swift-frontend -scan-dependencies %s -scanner-module-validation -o %t/deps.json -I %t -emit-dependencies -emit-dependencies-path %t/deps.d
 // RUN: %validate-json %t/deps.json | %FileCheck %s -check-prefix=HAS_BINARY
 
 // Step 3: remove the adjacent module.
@@ -38,7 +38,7 @@ import Foo
 // RUN: %validate-json %t/deps.json | %FileCheck %s -check-prefix=HAS_COMPILED
 
 /// Check scanner picked binary dependency if not requesting raw scan output.
-// RUN: %target-swift-frontend -scan-dependencies %s -o %t/deps.json -I %t -emit-dependencies -emit-dependencies-path %t/deps.d -sdk %t -prebuilt-module-cache-path %t/ResourceDir/%target-sdk-name/prebuilt-modules
+// RUN: %target-swift-frontend -scan-dependencies %s -scanner-module-validation -o %t/deps.json -I %t -emit-dependencies -emit-dependencies-path %t/deps.d -sdk %t -prebuilt-module-cache-path %t/ResourceDir/%target-sdk-name/prebuilt-modules
 // RUN: %validate-json %t/deps.json | %FileCheck %s -check-prefix=HAS_BINARY
 
 // Step 6: update the interface file from where the prebuilt module cache was built.

Diff for: test/ScanDependencies/restrict-swiftmodule-to-revision.swift

@@ -17,21 +17,21 @@
 // RUN:   -emit-module-interface-path %t/revision/Foo.swiftinterface -enable-library-evolution %t/foo.swift
 
 // RUN: env SWIFT_DEBUG_FORCE_SWIFTMODULE_REVISION=1.0.0.0.1 \
-// RUN:   %target-swift-frontend -scan-dependencies -module-name Test -O -module-load-mode prefer-binary \
+// RUN:   %target-swift-frontend -scan-dependencies -scanner-module-validation -module-name Test -O -module-load-mode prefer-binary \
 // RUN:   -disable-implicit-string-processing-module-import -disable-implicit-concurrency-module-import -parse-stdlib \
 // RUN:   %t/main.swift -o %t/deps-1.json -swift-version 5 -I %t/match
 
 // RUN: %FileCheck %s --check-prefix=BINARY --input-file=%t/deps-1.json
 
 // RUN: env SWIFT_DEBUG_FORCE_SWIFTMODULE_REVISION=1.0.0.0.1 \
-// RUN:   %target-swift-frontend -scan-dependencies -module-name Test -O -module-load-mode prefer-binary \
+// RUN:   %target-swift-frontend -scan-dependencies -scanner-module-validation -module-name Test -O -module-load-mode prefer-binary \
 // RUN:   -disable-implicit-string-processing-module-import -disable-implicit-concurrency-module-import -parse-stdlib \
 // RUN:   %t/main.swift -o %t/deps-2.json -swift-version 5 -I %t/new
 
 // RUN: %FileCheck %s --check-prefix=TEXTUAL --input-file=%t/deps-2.json
 
 // RUN: env SWIFT_DEBUG_FORCE_SWIFTMODULE_REVISION=1.0.0.0.1 \
-// RUN:   %target-swift-frontend -scan-dependencies -module-name Test -O -module-load-mode prefer-binary \
+// RUN:   %target-swift-frontend -scan-dependencies -scanner-module-validation -module-name Test -O -module-load-mode prefer-binary \
 // RUN:   -disable-implicit-string-processing-module-import -disable-implicit-concurrency-module-import -parse-stdlib \
 // RUN:   %t/main.swift -o %t/deps-3.json -swift-version 5 -I %t/revision
 

Diff for: test/ScanDependencies/testable-dependencies.swift

@@ -17,7 +17,7 @@
 // RUN:   %t/A.swift
 
 /// Import testable build, should use binary but no extra dependencies.
-// RUN: %target-swift-frontend -scan-dependencies -module-load-mode prefer-serialized -module-name Test %t/main.swift \
+// RUN: %target-swift-frontend -scan-dependencies -scanner-module-validation -module-load-mode prefer-serialized -module-name Test %t/main.swift \
 // RUN:   -disable-implicit-string-processing-module-import -disable-implicit-concurrency-module-import -parse-stdlib \
 // RUN:   -o %t/deps1.json -I %t/testable -swift-version 5 -Rmodule-loading
 // RUN: %{python} %S/../CAS/Inputs/SwiftDepsExtractor.py %t/deps1.json Test directDependencies | %FileCheck %s --check-prefix TEST1
@@ -26,15 +26,15 @@
 // EMPTY-NOT: B
 
 /// Import regular build, should use binary.
-// RUN: %target-swift-frontend -scan-dependencies -module-load-mode prefer-serialized -module-name Test %t/main.swift \
+// RUN: %target-swift-frontend -scan-dependencies -scanner-module-validation -module-load-mode prefer-serialized -module-name Test %t/main.swift \
 // RUN:   -disable-implicit-string-processing-module-import -disable-implicit-concurrency-module-import -parse-stdlib \
 // RUN:   -o %t/deps2.json -I %t/regular -swift-version 5 -Rmodule-loading
 // RUN: %{python} %S/../CAS/Inputs/SwiftDepsExtractor.py %t/deps2.json Test directDependencies | %FileCheck %s --check-prefix TEST2
 // TEST2:  "swiftPrebuiltExternal": "A"
 // RUN: %{python} %S/../CAS/Inputs/SwiftDepsExtractor.py %t/deps2.json swiftPrebuiltExternal:A directDependencies | %FileCheck %s --check-prefix EMPTY --allow-empty
 
 /// Testable import testable build, should use binary, even interface is preferred.
-// RUN: %target-swift-frontend -scan-dependencies -module-load-mode prefer-interface -module-name Test %t/testable.swift \
+// RUN: %target-swift-frontend -scan-dependencies -scanner-module-validation -module-load-mode prefer-interface -module-name Test %t/testable.swift \
 // RUN:   -disable-implicit-string-processing-module-import -disable-implicit-concurrency-module-import -parse-stdlib -enable-testing \
 // RUN:   -o %t/deps3.json -I %t/testable -I %t/internal -swift-version 5 -Rmodule-loading
 // RUN: %{python} %S/../CAS/Inputs/SwiftDepsExtractor.py %t/deps3.json Test directDependencies | %FileCheck %s --check-prefix TEST3
@@ -43,7 +43,7 @@
 // TEST3-A:  "swift": "B"
 
 /// Testable import sees non-testable module first, keep searching.
-// RUN: %target-swift-frontend -scan-dependencies -module-load-mode prefer-interface -module-name Test %t/testable.swift \
+// RUN: %target-swift-frontend -scan-dependencies -scanner-module-validation -module-load-mode prefer-interface -module-name Test %t/testable.swift \
 // RUN:   -disable-implicit-string-processing-module-import -disable-implicit-concurrency-module-import -parse-stdlib -enable-testing \
 // RUN:   -o %t/deps4.json -I %t/regular -I %t/testable -I %t/internal -swift-version 5 -Rmodule-loading 2>&1 | %FileCheck %s --check-prefix WARN
 // RUN: %{python} %S/../CAS/Inputs/SwiftDepsExtractor.py %t/deps4.json Test directDependencies | %FileCheck %s --check-prefix TEST4
@@ -52,15 +52,15 @@
 // TEST4-A:  "swift": "B"
 
 /// Testable import non-testable build enable testing, warning about the finding then error out.
-// RUN: %target-swift-frontend -scan-dependencies -module-load-mode prefer-interface -module-name Test %t/testable.swift \
+// RUN: %target-swift-frontend -scan-dependencies -scanner-module-validation -module-load-mode prefer-interface -module-name Test %t/testable.swift \
 // RUN:   -disable-implicit-string-processing-module-import -disable-implicit-concurrency-module-import -parse-stdlib -enable-testing \
 // RUN:   -o %t/deps5.json -I %t/regular -swift-version 5 -Rmodule-loading 2>&1 | %FileCheck %s --check-prefix WARN --check-prefix ERROR
 // WARN: warning: ignore swiftmodule built without '-enable-testing'
 // ERROR: error: Unable to find module dependency: 'A'
 
 /// Regular import a testable module with no interface, don't load optional dependencies.
 // RUN: rm %t/testable/A.swiftinterface
-// RUN: %target-swift-frontend -scan-dependencies -module-load-mode prefer-interface -module-name Test %t/main.swift \
+// RUN: %target-swift-frontend -scan-dependencies -scanner-module-validation -module-load-mode prefer-interface -module-name Test %t/main.swift \
 // RUN:   -disable-implicit-string-processing-module-import -disable-implicit-concurrency-module-import -parse-stdlib -enable-testing \
 // RUN:   -o %t/deps6.json -I %t/testable -swift-version 5 -Rmodule-loading
 // RUN: %{python} %S/../CAS/Inputs/SwiftDepsExtractor.py %t/deps6.json Test directDependencies | %FileCheck %s --check-prefix TEST6