Reland r219810 "Fix late template parsing leak with incremental processing"

Original message:
Add a second late template parser callback meant to cleanup any
resources allocated by late template parsing.  Call it from the
Sema::ActOnEndOfTranslationUnit method after all pending template
instantiations have been completed.  Teach Parser::ParseTopLevelDecl to
install the cleanup callback when incremental processing is enabled so
that Parser::TemplateIds can be freed.

Patch by Brad King!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@220400 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 45 insertions, 4 deletions

diff --git a/unittests/Frontend/FrontendActionTest.cpp b/unittests/Frontend/FrontendActionTest.cpp
index 3171156692..5581c4487e 100644
--- a/unittests/Frontend/FrontendActionTest.cpp
+++ b/unittests/Frontend/FrontendActionTest.cpp
@@ -14,6 +14,7 @@
 #include "clang/Frontend/CompilerInstance.h"
 #include "clang/Frontend/CompilerInvocation.h"
 #include "clang/Lex/Preprocessor.h"
+#include "clang/Sema/Sema.h"
 #include "llvm/ADT/Triple.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "gtest/gtest.h"
@@ -25,10 +26,13 @@ namespace {
 
 class TestASTFrontendAction : public ASTFrontendAction {
 public:
-  TestASTFrontendAction(bool enableIncrementalProcessing = false)
-    : EnableIncrementalProcessing(enableIncrementalProcessing) { }
+  TestASTFrontendAction(bool enableIncrementalProcessing = false,
+                        bool actOnEndOfTranslationUnit = false)
+    : EnableIncrementalProcessing(enableIncrementalProcessing),
+      ActOnEndOfTranslationUnit(actOnEndOfTranslationUnit) { }
 
   bool EnableIncrementalProcessing;
+  bool ActOnEndOfTranslationUnit;
   std::vector<std::string> decl_names;
 
   virtual bool BeginSourceFileAction(CompilerInstance &ci, StringRef filename) {
@@ -40,15 +44,22 @@ public:
 
   virtual std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,
                                                          StringRef InFile) {
-    return llvm::make_unique<Visitor>(decl_names);
+    return llvm::make_unique<Visitor>(CI, ActOnEndOfTranslationUnit,
+                                      decl_names);
   }
 
 private:
   class Visitor : public ASTConsumer, public RecursiveASTVisitor<Visitor> {
   public:
-    Visitor(std::vector<std::string> &decl_names) : decl_names_(decl_names) {}
+    Visitor(CompilerInstance &CI, bool ActOnEndOfTranslationUnit,
+            std::vector<std::string> &decl_names) :
+      CI(CI), ActOnEndOfTranslationUnit(ActOnEndOfTranslationUnit),
+      decl_names_(decl_names) {}
 
     virtual void HandleTranslationUnit(ASTContext &context) {
+      if (ActOnEndOfTranslationUnit) {
+        CI.getSema().ActOnEndOfTranslationUnit();
+      }
       TraverseDecl(context.getTranslationUnitDecl());
     }
 
@@ -58,6 +69,8 @@ private:
     }
 
   private:
+    CompilerInstance &CI;
+    bool ActOnEndOfTranslationUnit;
     std::vector<std::string> &decl_names_;
   };
 };
@@ -102,6 +115,34 @@ TEST(ASTFrontendAction, IncrementalParsing) {
   EXPECT_EQ("x", test_action.decl_names[1]);
 }
 
+TEST(ASTFrontendAction, LateTemplateIncrementalParsing) {
+  CompilerInvocation *invocation = new CompilerInvocation;
+  invocation->getLangOpts()->CPlusPlus = true;
+  invocation->getLangOpts()->DelayedTemplateParsing = true;
+  invocation->getPreprocessorOpts().addRemappedFile(
+    "test.cc", MemoryBuffer::getMemBuffer(
+      "template<typename T> struct A { A(T); T data; };\n"
+      "template<typename T> struct B: public A<T> {\n"
+      "  B();\n"
+      "  B(B const& b): A<T>(b.data) {}\n"
+      "};\n"
+      "B<char> c() { return B<char>(); }\n").release());
+  invocation->getFrontendOpts().Inputs.push_back(FrontendInputFile("test.cc",
+                                                                   IK_CXX));
+  invocation->getFrontendOpts().ProgramAction = frontend::ParseSyntaxOnly;
+  invocation->getTargetOpts().Triple = "i386-unknown-linux-gnu";
+  CompilerInstance compiler;
+  compiler.setInvocation(invocation);
+  compiler.createDiagnostics();
+
+  TestASTFrontendAction test_action(/*enableIncrementalProcessing=*/true,
+                                    /*actOnEndOfTranslationUnit=*/true);
+  ASSERT_TRUE(compiler.ExecuteAction(test_action));
+  ASSERT_EQ(13U, test_action.decl_names.size());
+  EXPECT_EQ("A", test_action.decl_names[0]);
+  EXPECT_EQ("c", test_action.decl_names[12]);
+}
+
 struct TestPPCallbacks : public PPCallbacks {
   TestPPCallbacks() : SeenEnd(false) {}