[Templight] Template Instantiation Observer

This patch adds a base-class called TemplateInstantiationObserver which gets
notified whenever a template instantiation is entered or exited during
semantic analysis. This is a base class used to implement the template
profiling and debugging tool called
Templight (https://github.com/mikael-s-persson/templight).

The patch also makes a few more changes:

* ActiveTemplateInstantiation class is moved out of the Sema class (so it can be used with inclusion of Sema.h).
* CreateFrontendAction function in front-end utilities is given external linkage (not longer a hidden static function).
* TemplateInstObserverChain data member added to Sema class to hold the list of template-inst observers.
* Notifications to the template-inst observer are added at the key places where templates are instantiated.

Patch by: Abel Sinkovics!

Differential Revision: https://reviews.llvm.org/D5767

llvm-svn: 324808

1 files changed, 7 insertions, 2 deletions

diff --git a/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp b/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp
index 4167e1fe20b..59f30d5c306 100644
--- a/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp
+++ b/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp
@@ -32,6 +32,8 @@
 using namespace clang;
 using namespace llvm::opt;
 
+namespace clang {
+
 static std::unique_ptr<FrontendAction>
 CreateFrontendBaseAction(CompilerInstance &CI) {
   using namespace clang::frontend;
@@ -63,6 +65,7 @@ CreateFrontendBaseAction(CompilerInstance &CI) {
   case ParseSyntaxOnly:        return llvm::make_unique<SyntaxOnlyAction>();
   case ModuleFileInfo:         return llvm::make_unique<DumpModuleInfoAction>();
   case VerifyPCH:              return llvm::make_unique<VerifyPCHAction>();
+  case TemplightDump:          return llvm::make_unique<TemplightDumpAction>();
 
   case PluginAction: {
     for (FrontendPluginRegistry::iterator it =
@@ -122,7 +125,7 @@ CreateFrontendBaseAction(CompilerInstance &CI) {
 #endif
 }
 
-static std::unique_ptr<FrontendAction>
+std::unique_ptr<FrontendAction>
 CreateFrontendAction(CompilerInstance &CI) {
   // Create the underlying action.
   std::unique_ptr<FrontendAction> Act = CreateFrontendBaseAction(CI);
@@ -173,7 +176,7 @@ CreateFrontendAction(CompilerInstance &CI) {
   return Act;
 }
 
-bool clang::ExecuteCompilerInvocation(CompilerInstance *Clang) {
+bool ExecuteCompilerInvocation(CompilerInstance *Clang) {
   // Honor -help.
   if (Clang->getFrontendOpts().ShowHelp) {
     std::unique_ptr<OptTable> Opts = driver::createDriverOptTable();
@@ -254,3 +257,5 @@ bool clang::ExecuteCompilerInvocation(CompilerInstance *Clang) {
     BuryPointer(std::move(Act));
   return Success;
 }
+
+} //namespace clang