[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

include/swift/AST/SearchPathOptions.h

@@ -532,8 +532,9 @@ 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.
@@ -583,7 +584,7 @@ class SearchPathOptions {
  hash_combine_range(RuntimeLibraryImportPaths.begin(),
  RuntimeLibraryImportPaths.end()),
  DisableModulesValidateSystemDependencies,
- NoScannerModuleValidation,
+ ScannerModuleValidation,
  ModuleLoadMode);
  }
 

include/swift/Option/FrontendOptions.td

@@ -1357,6 +1357,8 @@ 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">,

lib/Frontend/CompilerInvocation.cpp

@@ -1967,6 +1967,7 @@ 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;
@@ -2104,8 +2105,10 @@ 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))
@@ -3494,7 +3497,7 @@ bool CompilerInvocation::parseArgs(
  ParseSymbolGraphArgs(SymbolGraphOpts, ParsedArgs, Diags, LangOpts);
 
  if (ParseSearchPathArgs(SearchPathOpts, ParsedArgs, Diags,
- workingDirectory)) {
+ CASOpts, workingDirectory)) {
  return true;
  }
 

lib/Frontend/ModuleInterfaceLoader.cpp

@@ -1402,7 +1402,7 @@ 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
@@ -1919,8 +1919,7 @@ InterfaceSubContextDelegateImpl::InterfaceSubContextDelegateImpl(
  searchPathOpts.PluginSearchOpts;
 
  // Get module loading behavior options.
- genericSubInvocation.getSearchPathOptions().NoScannerModuleValidation =
- searchPathOpts.NoScannerModuleValidation;
+ genericSubInvocation.getSearchPathOptions().ScannerModuleValidation = searchPathOpts.ScannerModuleValidation;
  genericSubInvocation.getSearchPathOptions().ModuleLoadMode =
  searchPathOpts.ModuleLoadMode;
 

lib/Serialization/ScanningLoaders.cpp

@@ -156,7 +156,7 @@ 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,

lib/Serialization/SerializedModuleLoader.cpp

@@ -454,7 +454,7 @@ 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)

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.

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
@@ -43,21 +43,21 @@
 // TEST3-A: "swift": "B"
 
 /// Testable import non-testable build without enable testing.
-// 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 \
 // RUN: -o %t/deps4.json -I %t/regular -swift-version 5
 // RUN: %{python} %S/../CAS/Inputs/SwiftDepsExtractor.py %t/deps4.json Test directDependencies | %FileCheck %s --check-prefix TEST4
 // TEST4: "swiftPrebuiltExternal": "A"
 // RUN: %{python} %S/../CAS/Inputs/SwiftDepsExtractor.py %t/deps4.json swiftPrebuiltExternal:A directDependencies | %FileCheck %s --check-prefix EMPTY --allow-empty
 
 /// Testable import non-testable build enable testing, still succeed since swift-frontend can provide a better diagnostics when the module is actually imported.
-// 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
 
 /// 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