Frontend: add a flag to disable fine-grained module tracing

Author: nkcsgexi

include/swift/Frontend/FrontendOptions.h

@@ -565,6 +565,10 @@ class FrontendOptions {
 
   /// All block list configuration files to be honored in this compilation.
   std::vector<std::string> BlocklistConfigFilePaths;
+
+  /// Whether explicitly disble fine-grained module tracing in this compiler
+  /// invocation.
+  bool DisableFineModuleTracing = false;
 private:
   static bool canActionEmitDependencies(ActionType);
   static bool canActionEmitReferenceDependencies(ActionType);

include/swift/Option/FrontendOptions.td

@@ -1245,6 +1245,10 @@ def skip_import_in_public_interface:
   HelpText<"Skip the import statement corresponding to a module name "
            "when printing the public interface.">;
 
+def disable_fine_module_tracing:
+  Flag<["-"], "disable-fine-module-tracing">,
+  HelpText<"Skip the emission of fine grained module tracing file.">;
+
 def clang_header_expose_decls:
   Joined<["-"], "clang-header-expose-decls=">,
   HelpText<"Which declarations should be exposed in the generated clang header.">,

lib/Frontend/ArgsToFrontendOptionsConverter.cpp

@@ -392,7 +392,7 @@ bool ArgsToFrontendOptionsConverter::convert(
   }
 
   Opts.DisableSandbox = Args.hasArg(OPT_disable_sandbox);
-
+  Opts.DisableFineModuleTracing = Args.hasArg(OPT_disable_fine_module_tracing);
   return false;
 }
 

lib/FrontendTool/LoadedModuleTrace.cpp

@@ -946,6 +946,9 @@ static bool shouldActionTypeEmitFineModuleTrace(FrontendOptions::ActionType acti
 
 bool swift::emitFineModuleTraceIfNeeded(CompilerInstance &Instance,
                                         const FrontendOptions &opts) {
+  if (opts.DisableFineModuleTracing) {
+    return false;
+  }
   if (!shouldActionTypeEmitFineModuleTrace(opts.RequestedAction)) {
     return false;
   }

test/IDE/objc_send_collector_1.swift

@@ -19,6 +19,9 @@
 // RUN: SWIFT_COMPILER_FINE_GRAINED_TRACE_PATH=%t/given_trace_3.json %target-swift-frontend  -I %t/lib/swift -typecheck %s %S/Inputs/objc_send_collector_2.swift -module-name FooBar -swift-version 5 -F %S/Inputs/mock-sdk -emit-loaded-module-trace-path %t/.MODULE_TRACE -blocklist-file %t/blocklist.yml
 // RUN: not ls %t/given_trace_3.json
 
+// RUN: SWIFT_COMPILER_FINE_GRAINED_TRACE_PATH=%t/given_trace_4.json %target-swift-frontend  -I %t/lib/swift -typecheck %s %S/Inputs/objc_send_collector_2.swift -module-name FooBar -swift-version 5 -F %S/Inputs/mock-sdk -emit-loaded-module-trace-path %t/.MODULE_TRACE -disable-fine-module-tracing
+// RUN: not ls %t/given_trace_4.json
+
 // REQUIRES: objc_interop
 
 import Foo