[Stats] Add some tracers to SILGen.

Author: graydon

lib/SILGen/SILGen.cpp

@@ -719,7 +719,7 @@ void SILGenModule::emitFunction(FuncDecl *fd) {
   emitAbstractFuncDecl(fd);
 
   if (hasSILBody(fd)) {
-    FrontendStatsTracer Tracer(getASTContext().Stats, "emit-SIL", fd);
+    FrontendStatsTracer Tracer(getASTContext().Stats, "SILGen-funcdecl", fd);
     PrettyStackTraceDecl stackTrace("emitting SIL for", fd);
 
     SILDeclRef constant(decl);
@@ -1536,11 +1536,16 @@ class SourceFileScope {
 
 void SILGenModule::emitSourceFile(SourceFile *sf, unsigned startElem) {
   SourceFileScope scope(*this, sf);
-  for (Decl *D : llvm::makeArrayRef(sf->Decls).slice(startElem))
+  FrontendStatsTracer StatsTracer(getASTContext().Stats, "SILgen-file", sf);
+  for (Decl *D : llvm::makeArrayRef(sf->Decls).slice(startElem)) {
+    FrontendStatsTracer StatsTracer(getASTContext().Stats, "SILgen-decl", D);
     visit(D);
+  }
 
-  for (Decl *D : sf->LocalTypeDecls)
+  for (Decl *D : sf->LocalTypeDecls) {
+    FrontendStatsTracer StatsTracer(getASTContext().Stats, "SILgen-tydecl", D);
     visit(D);
+  }
 
   // Mark any conformances as "used".
   for (auto conformance : sf->getUsedConformances())

lib/SILGen/SILGenFunction.cpp

@@ -33,7 +33,8 @@ using namespace Lowering;
 SILGenFunction::SILGenFunction(SILGenModule &SGM, SILFunction &F)
     : SGM(SGM), F(F), silConv(SGM.M), StartOfPostmatter(F.end()),
       B(*this), OpenedArchetypesTracker(&F),
-      CurrentSILLoc(F.getLocation()), Cleanups(*this) {
+      CurrentSILLoc(F.getLocation()), Cleanups(*this),
+      StatsTracer(SGM.M.getASTContext().Stats, "SILGen-function", &F) {
   B.setInsertionPoint(createBasicBlock());
   B.setCurrentDebugScope(F.getDebugScope());
   B.setOpenedArchetypesTracker(&OpenedArchetypesTracker);

lib/SILGen/SILGenFunction.h

@@ -22,6 +22,7 @@
 #include "SILGenBuilder.h"
 #include "swift/AST/AnyFunctionRef.h"
 #include "swift/Basic/ProfileCounter.h"
+#include "swift/Basic/Statistic.h"
 #include "swift/SIL/SILBuilder.h"
 #include "llvm/ADT/PointerIntPair.h"
 
@@ -380,6 +381,9 @@ class LLVM_LIBRARY_VISIBILITY SILGenFunction
   /// Get the PGO node's parent.
   Optional<ASTNode> getPGOParent(ASTNode Node) const;
 
+  /// Tracer object for counting SIL (and other events) caused by this instance.
+  FrontendStatsTracer StatsTracer;
+
   SILGenFunction(SILGenModule &SGM, SILFunction &F);
   ~SILGenFunction();