FineModuleTracing: use requested action type to further gate whether emitting fine-grained module trace is supported.

Emitting fine-grained module tracing files during full compilation should be sufficient for the use case in design. Other
swift-frontend invocations, such as emitting modules, doesn't need fully type-checked AST to perform the action, therefore
requesting/walking the fully typechecked AST to emit those tracing files may introduce performance overhead.

Author: nkcsgexi

lib/FrontendTool/LoadedModuleTrace.cpp

@@ -899,8 +899,56 @@ static void createFineModuleTraceFile(CompilerInstance &instance,
   }
 }
 
+static bool shouldActionTypeEmitFineModuleTrace(FrontendOptions::ActionType action) {
+  // Only full compilation jobs should emit fine module tracing file.
+  // Other partial compilation jobs, such as emitting modules, only typecheck partially
+  // so walking into every function bodies may be risky.
+  switch(action) {
+  case swift::FrontendOptions::ActionType::Typecheck:
+  case swift::FrontendOptions::ActionType::EmitSILGen:
+  case swift::FrontendOptions::ActionType::EmitSIL:
+  case swift::FrontendOptions::ActionType::EmitAssembly:
+  case swift::FrontendOptions::ActionType::EmitLoweredSIL:
+  case swift::FrontendOptions::ActionType::EmitIRGen:
+  case swift::FrontendOptions::ActionType::EmitIR:
+  case swift::FrontendOptions::ActionType::EmitBC:
+  case swift::FrontendOptions::ActionType::EmitObject:
+    return true;
+  case swift::FrontendOptions::ActionType::NoneAction:
+  case swift::FrontendOptions::ActionType::Parse:
+  case swift::FrontendOptions::ActionType::ResolveImports:
+  case swift::FrontendOptions::ActionType::DumpParse:
+  case swift::FrontendOptions::ActionType::DumpInterfaceHash:
+  case swift::FrontendOptions::ActionType::DumpAST:
+  case swift::FrontendOptions::ActionType::PrintAST:
+  case swift::FrontendOptions::ActionType::PrintASTDecl:
+  case swift::FrontendOptions::ActionType::DumpScopeMaps:
+  case swift::FrontendOptions::ActionType::DumpAvailabilityScopes:
+  case swift::FrontendOptions::ActionType::EmitImportedModules:
+  case swift::FrontendOptions::ActionType::EmitPCH:
+  case swift::FrontendOptions::ActionType::EmitModuleOnly:
+  case swift::FrontendOptions::ActionType::MergeModules:
+  case swift::FrontendOptions::ActionType::CompileModuleFromInterface:
+  case swift::FrontendOptions::ActionType::TypecheckModuleFromInterface:
+  case swift::FrontendOptions::ActionType::EmitSIBGen:
+  case swift::FrontendOptions::ActionType::EmitSIB:
+  case swift::FrontendOptions::ActionType::Immediate:
+  case swift::FrontendOptions::ActionType::REPL:
+  case swift::FrontendOptions::ActionType::DumpTypeInfo:
+  case swift::FrontendOptions::ActionType::EmitPCM:
+  case swift::FrontendOptions::ActionType::DumpPCM:
+  case swift::FrontendOptions::ActionType::ScanDependencies:
+  case swift::FrontendOptions::ActionType::PrintVersion:
+  case swift::FrontendOptions::ActionType::PrintFeature:
+    return false;
+  }
+}
+
 bool swift::emitFineModuleTraceIfNeeded(CompilerInstance &Instance,
                                         const FrontendOptions &opts) {
+  if (!shouldActionTypeEmitFineModuleTrace(opts.RequestedAction)) {
+    return false;
+  }
   ModuleDecl *mainModule = Instance.getMainModule();
   ASTContext &ctxt = mainModule->getASTContext();
   assert(!ctxt.hadError() &&

test/IDE/objc_send_collector_1.swift

@@ -7,6 +7,9 @@
 // RUN: SWIFT_COMPILER_FINE_GRAINED_TRACE_PATH=%t/given_trace.json %target-swift-frontend  -I %t/lib/swift -typecheck %s %S/Inputs/objc_send_collector_2.swift -module-name main -swift-version 5 -F %S/Inputs/mock-sdk -emit-loaded-module-trace-path %t/.MODULE_TRACE
 // RUN: cat %t/given_trace.json | %{python} -c 'import json, sys; json.dump(json.loads(sys.stdin.read()), sys.stdout, sort_keys=True, indent=2)' | %FileCheck %s
 
+// RUN: SWIFT_COMPILER_FINE_GRAINED_TRACE_PATH=%t/given_trace_2.json %target-swift-frontend  -I %t/lib/swift -emit-module %s %S/Inputs/objc_send_collector_2.swift -module-name main -swift-version 5 -F %S/Inputs/mock-sdk -emit-loaded-module-trace-path %t/.MODULE_TRACE -enable-library-evolution
+// RUN: not ls %t/given_trace_2.json
+
 // REQUIRES: objc_interop
 
 import Foo