From f8aa155e40bc98844f46ecbfdbe430696c36ce24 Mon Sep 17 00:00:00 2001
From: David Blaikie <dblaikie@gmail.com>
Date: Mon, 13 May 2013 06:57:50 +0000
Subject: [PATCH] Debug Info: PR14992: Support values for non-type template
 parameters of function type

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181685 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/CGDebugInfo.cpp             |  4 +++-
 test/CodeGenCXX/debug-info-template.cpp | 23 +++++++++++++++--------
 2 files changed, 18 insertions(+), 9 deletions(-)

diff --git a/lib/CodeGen/CGDebugInfo.cpp b/lib/CodeGen/CGDebugInfo.cpp
index 13b681edc9..583b23980e 100644
--- a/lib/CodeGen/CGDebugInfo.cpp
+++ b/lib/CodeGen/CGDebugInfo.cpp
@@ -1220,9 +1220,11 @@ CollectTemplateParams(const TemplateParameterList *TPList,
         V = CGM.GetAddrOfGlobalVar(VD);
       // Member function pointers have special support for building them, though
       // this is currently unsupported in LLVM CodeGen.
-      if (InstanceMember)
+      if (InstanceMember) {
         if (const CXXMethodDecl *method = dyn_cast<CXXMethodDecl>(D))
           V = CGM.getCXXABI().EmitMemberPointer(method);
+      } else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
+        V = CGM.GetAddrOfFunction(FD);
       // Member data pointers have special handling too to compute the fixed
       // offset within the object.
       if (isa<FieldDecl>(D)) {
diff --git a/test/CodeGenCXX/debug-info-template.cpp b/test/CodeGenCXX/debug-info-template.cpp
index 1d2dc10cf2..a97c991f38 100644
--- a/test/CodeGenCXX/debug-info-template.cpp
+++ b/test/CodeGenCXX/debug-info-template.cpp
@@ -2,6 +2,9 @@
 
 // CHECK: [[EMPTY:![0-9]*]] = metadata !{i32 0}
 
+// CHECK: [[FUNTYPE:![0-9]*]] = {{.*}}, metadata [[FUNARGS:![0-9]*]], i32 0, i32 0} ; [ DW_TAG_subroutine_type ]
+// CHECK: [[FUNARGS]] = metadata !{null}
+
 // func<...> doesn't have any template arguments listed since we don't support
 // packs yet. This could be encoded with GNU's
 // DW_TAG_GNU_template_parameter_pack extension.
@@ -9,8 +12,8 @@
 
 // CHECK: [[INT:![0-9]*]] = {{.*}} ; [ DW_TAG_base_type ] [int]
 // CHECK: metadata [[TCI:![0-9]*]], i32 0, i32 1, %class.TC* @tci, null} ; [ DW_TAG_variable ] [tci]
-// CHECK: [[TC:![0-9]*]] = {{.*}}, metadata [[TCARGS:![0-9]*]]} ; [ DW_TAG_class_type ] [TC<unsigned int, 2, &glb, &foo::e, &foo::f>]
-// CHECK: [[TCARGS]] = metadata !{metadata [[TCARG1:![0-9]*]], metadata [[TCARG2:![0-9]*]], metadata [[TCARG3:![0-9]*]], metadata [[TCARG4:![0-9]*]], metadata [[TCARG5:![0-9]*]]}
+// CHECK: [[TC:![0-9]*]] = {{.*}}, metadata [[TCARGS:![0-9]*]]} ; [ DW_TAG_class_type ] [TC<unsigned int, 2, &glb, &foo::e, &foo::f, &func>]
+// CHECK: [[TCARGS]] = metadata !{metadata [[TCARG1:![0-9]*]], metadata [[TCARG2:![0-9]*]], metadata [[TCARG3:![0-9]*]], metadata [[TCARG4:![0-9]*]], metadata [[TCARG5:![0-9]*]], metadata [[TCARG6:![0-9]*]]}
 //
 // We seem to be missing file/line/col info on template value parameters -
 // metadata supports it but it's not populated. GCC doesn't emit it either,
@@ -39,11 +42,13 @@
 //
 // CHECK: [[TCARG5]] = {{.*}}metadata !"b", metadata [[MEMFUNPTR:![0-9]*]], { i64, i64 } { i64 ptrtoint (void (%struct.foo*)* @_ZN3foo1fEv to i64), i64 0 }, {{.*}} ; [ DW_TAG_template_value_parameter ]
 // CHECK: [[MEMFUNPTR]] = {{.*}}, metadata [[FTYPE]], metadata [[FOO]]} ; [ DW_TAG_ptr_to_member_type ]
+// CHECK: [[TCARG6]] = {{.*}}metadata !"f", metadata [[FUNPTR:![0-9]*]], void ()* @_Z4funcv, {{.*}} ; [ DW_TAG_template_value_parameter ]
+// CHECK: [[FUNPTR]] = {{.*}}, metadata [[FUNTYPE]]} ; [ DW_TAG_pointer_type ]
 
 
 // CHECK: metadata [[TCNT:![0-9]*]], i32 0, i32 1, %class.TC.0* @tcn, null} ; [ DW_TAG_variable ] [tcn]
-// CHECK: [[TCNT:![0-9]*]] = {{.*}}, metadata [[TCNARGS:![0-9]*]]} ; [ DW_TAG_class_type ] [TC<int, -3, nullptr, nullptr, nullptr>]
-// CHECK: [[TCNARGS]] = metadata !{metadata [[TCNARG1:![0-9]*]], metadata [[TCNARG2:![0-9]*]], metadata [[TCNARG3:![0-9]*]], metadata [[TCNARG4:![0-9]*]], metadata [[TCNARG5:![0-9]*]]}
+// CHECK: [[TCNT:![0-9]*]] = {{.*}}, metadata [[TCNARGS:![0-9]*]]} ; [ DW_TAG_class_type ] [TC<int, -3, nullptr, nullptr, nullptr, nullptr>]
+// CHECK: [[TCNARGS]] = metadata !{metadata [[TCNARG1:![0-9]*]], metadata [[TCNARG2:![0-9]*]], metadata [[TCNARG3:![0-9]*]], metadata [[TCNARG4:![0-9]*]], metadata [[TCNARG5:![0-9]*]], metadata [[TCNARG6:![0-9]*]]}
 // CHECK: [[TCNARG1]] = {{.*}}metadata !"T", metadata [[INT]], {{.*}} ; [ DW_TAG_template_type_parameter ]
 // CHECK: [[TCNARG2]] = {{.*}}metadata !"", metadata [[INT]], i32 -3, {{.*}} ; [ DW_TAG_template_value_parameter ]
 // CHECK: [[TCNARG3]] = {{.*}}metadata !"x", metadata [[INTPTR]], i8 0, {{.*}} ; [ DW_TAG_template_value_parameter ]
@@ -59,21 +64,23 @@
 // naturally from the LLVM CodeGen side once we decide how to handle non-null
 // member function pointers. For now, it's simpler just to emit the 'i8 0'.
 //
-// CHECK: [[TCNARG5]] = {{.*}}metadata !"b", metadata [[MEMFUNPTR:![0-9]*]], i8 0, {{.*}} ; [ DW_TAG_template_value_parameter ]
+// CHECK: [[TCNARG5]] = {{.*}}metadata !"b", metadata [[MEMFUNPTR]], i8 0, {{.*}} ; [ DW_TAG_template_value_parameter ]
+// CHECK: [[TCNARG6]] = {{.*}}metadata !"f", metadata [[FUNPTR]], i8 0, {{.*}} ; [ DW_TAG_template_value_parameter ]
 struct foo {
   char pad[8]; // make the member pointer to 'e' a bit more interesting (nonzero)
   int e;
   void f();
 };
 
-template<typename T, T, int *x, int foo::*a, void (foo::*b)()>
+template<typename T, T, int *x, int foo::*a, void (foo::*b)(), void (*f)()>
 class TC {
 };
 
 int glb;
+void func();
 
-TC<unsigned, 2, &glb, &foo::e, &foo::f> tci;
-TC<int, -3, nullptr, nullptr, nullptr> tcn;
+TC<unsigned, 2, &glb, &foo::e, &foo::f, &func> tci;
+TC<int, -3, nullptr, nullptr, nullptr, nullptr> tcn;
 
 template<typename ...Ts> int func() { return 0; }
 int anchor = func<int>();