5 files changed, 57 insertions, 16 deletions

diff --git a/llvm/test/tools/llvm-cov/Inputs/hideUnexecutedSubviews.proftext b/llvm/test/tools/llvm-cov/Inputs/hideUnexecutedSubviews.proftext
new file mode 100644
index 00000000000..e31d562d716
--- /dev/null
+++ b/llvm/test/tools/llvm-cov/Inputs/hideUnexecutedSubviews.proftext
@@ -0,0 +1,16 @@
+_Z4funcIbEiT_
+10
+2
+0
+0
+
+_Z4funcIiEiT_
+10
+2
+0
+0
+
+main
+0
+1
+0
diff --git a/llvm/test/tools/llvm-cov/hideUnexecutedSubviews.test b/llvm/test/tools/llvm-cov/hideUnexecutedSubviews.test
new file mode 100644
index 00000000000..44a788401d8
--- /dev/null
+++ b/llvm/test/tools/llvm-cov/hideUnexecutedSubviews.test
@@ -0,0 +1,10 @@
+RUN: llvm-profdata merge %S/Inputs/hideUnexecutedSubviews.proftext -o %t.profdata
+
+RUN: llvm-cov show %S/Inputs/templateInstantiations.covmapping -instr-profile %t.profdata -filename-equivalence %S/showTemplateInstantiations.cpp | FileCheck %s
+
+RUN: llvm-cov show %S/Inputs/templateInstantiations.covmapping -instr-profile %t.profdata -format html -o %t.html.dir -filename-equivalence %S/showTemplateInstantiations.cpp
+RUN: FileCheck %s -input-file %t.html.dir/coverage/tmp/showTemplateInstantiations.cpp.html
+
+CHECK: Unexecuted instantiation: _Z4funcIbEiT_
+CHECK: Unexecuted instantiation: _Z4funcIiEiT_
+CHECK-NOT: Unexecuted instantiation
diff --git a/llvm/tools/llvm-cov/CodeCoverage.cpp b/llvm/tools/llvm-cov/CodeCoverage.cpp
index 6edca9f6071..9eacbcad5ce 100644
--- a/llvm/tools/llvm-cov/CodeCoverage.cpp
+++ b/llvm/tools/llvm-cov/CodeCoverage.cpp
@@ -234,21 +234,23 @@ CodeCoverageTool::createSourceFileView(StringRef SourceFile,
   attachExpansionSubViews(*View, Expansions, Coverage);
 
   for (const auto *Function : Coverage.getInstantiations(SourceFile)) {
-    auto SubViewCoverage = Coverage.getCoverageForFunction(*Function);
-    auto SubViewExpansions = SubViewCoverage.getExpansions();
-    auto SubView = SourceCoverageView::create(
-        getSymbolForHumans(Function->Name), SourceBuffer.get(), ViewOpts,
-        std::move(SubViewCoverage));
-    attachExpansionSubViews(*SubView, SubViewExpansions, Coverage);
-
-    if (SubView) {
-      unsigned FileID = Function->CountedRegions.front().FileID;
-      unsigned Line = 0;
-      for (const auto &CR : Function->CountedRegions)
-        if (CR.FileID == FileID)
-          Line = std::max(CR.LineEnd, Line);
-      View->addInstantiation(Function->Name, Line, std::move(SubView));
+    std::unique_ptr<SourceCoverageView> SubView{nullptr};
+
+    if (Function->ExecutionCount > 0) {
+      auto SubViewCoverage = Coverage.getCoverageForFunction(*Function);
+      auto SubViewExpansions = SubViewCoverage.getExpansions();
+      SubView = SourceCoverageView::create(
+          getSymbolForHumans(Function->Name), SourceBuffer.get(), ViewOpts,
+          std::move(SubViewCoverage));
+      attachExpansionSubViews(*SubView, SubViewExpansions, Coverage);
     }
+
+    unsigned FileID = Function->CountedRegions.front().FileID;
+    unsigned Line = 0;
+    for (const auto &CR : Function->CountedRegions)
+      if (CR.FileID == FileID)
+        Line = std::max(CR.LineEnd, Line);
+    View->addInstantiation(Function->Name, Line, std::move(SubView));
   }
   return View;
 }
diff --git a/llvm/tools/llvm-cov/SourceCoverageViewHTML.cpp b/llvm/tools/llvm-cov/SourceCoverageViewHTML.cpp
index 0f176551550..31d6fd3048b 100644
--- a/llvm/tools/llvm-cov/SourceCoverageViewHTML.cpp
+++ b/llvm/tools/llvm-cov/SourceCoverageViewHTML.cpp
@@ -584,7 +584,15 @@ void SourceCoverageViewHTML::renderInstantiationView(raw_ostream &OS,
                                                      InstantiationView &ISV,
                                                      unsigned ViewDepth) {
   OS << BeginExpansionDiv;
-  ISV.View->print(OS, /*WholeFile=*/false, /*ShowSourceName=*/true, ViewDepth);
+  if (!ISV.View)
+    OS << BeginSourceNameDiv
+       << tag("pre",
+              escape("Unexecuted instantiation: " + ISV.FunctionName.str(),
+                     getOptions()))
+       << EndSourceNameDiv;
+  else
+    ISV.View->print(OS, /*WholeFile=*/false, /*ShowSourceName=*/true,
+                    ViewDepth);
   OS << EndExpansionDiv;
 }
 
diff --git a/llvm/tools/llvm-cov/SourceCoverageViewText.cpp b/llvm/tools/llvm-cov/SourceCoverageViewText.cpp
index 51c6463db30..f5201d9c808 100644
--- a/llvm/tools/llvm-cov/SourceCoverageViewText.cpp
+++ b/llvm/tools/llvm-cov/SourceCoverageViewText.cpp
@@ -215,7 +215,12 @@ void SourceCoverageViewText::renderInstantiationView(raw_ostream &OS,
                                                      unsigned ViewDepth) {
   renderLinePrefix(OS, ViewDepth);
   OS << ' ';
-  ISV.View->print(OS, /*WholeFile=*/false, /*ShowSourceName=*/true, ViewDepth);
+  if (!ISV.View)
+    getOptions().colored_ostream(OS, raw_ostream::RED)
+        << "Unexecuted instantiation: " << ISV.FunctionName << "\n";
+  else
+    ISV.View->print(OS, /*WholeFile=*/false, /*ShowSourceName=*/true,
+                    ViewDepth);
 }
 
 void SourceCoverageViewText::renderTitle(raw_ostream &OS, StringRef Title) {