Merging r284229:

------------------------------------------------------------------------
r284229 | abataev | 2016-10-14 12:43:59 +0000 (Fri, 14 Oct 2016) | 37 lines

Fix for PR30632: Name mangling issue.

There was a bug in the implementation of captured statements. If it has
a lambda expression in it and the same lambda expression is used outside
the captured region, clang produced an error:
```
error: definition with same mangled name as another definition
```
Here is an example:
```
struct A {
 template <typename L>
 void g(const L&) { }
};

template<typename T>
void f() {
  {
    A().g([](){});
  }
  A().g([](){});
}

int main() {
  f<void>();
}
```

Error report:
```
main.cpp:3:10: error: definition with same mangled name as another
definition
    void g(const L&) { }
             ^
main.cpp:3:10: note: previous definition is here
```
Patch fixes this bug.
------------------------------------------------------------------------


git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_39@286970 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 14 insertions, 5 deletions

diff --git a/lib/Sema/SemaLambda.cpp b/lib/Sema/SemaLambda.cpp
index 070c2fa2c7..0b3af262cd 100644
--- a/lib/Sema/SemaLambda.cpp
+++ b/lib/Sema/SemaLambda.cpp
@@ -314,18 +314,21 @@ Sema::getCurrentMangleNumberContext(const DeclContext *DC,
   bool IsInNonspecializedTemplate =
     !ActiveTemplateInstantiations.empty() || CurContext->isDependentContext();
   switch (Kind) {
-  case Normal:
+  case Normal: {
     //  -- the bodies of non-exported nonspecialized template functions
     //  -- the bodies of inline functions
     if ((IsInNonspecializedTemplate &&
          !(ManglingContextDecl && isa<ParmVarDecl>(ManglingContextDecl))) ||
         isInInlineFunction(CurContext)) {
       ManglingContextDecl = nullptr;
+      while (auto *CD = dyn_cast<CapturedDecl>(DC))
+        DC = CD->getParent();
       return &Context.getManglingNumberContext(DC);
     }
 
     ManglingContextDecl = nullptr;
     return nullptr;
+  }
 
   case StaticDataMember:
     //  -- the initializers of nonspecialized static members of template classes
diff --git a/test/CodeGenCXX/captured-statements.cpp b/test/CodeGenCXX/captured-statements.cpp
index fdda24fcf3..4b95503ad7 100644
--- a/test/CodeGenCXX/captured-statements.cpp
+++ b/test/CodeGenCXX/captured-statements.cpp
@@ -78,6 +78,7 @@ void test3(int x) {
   {
     x = [=]() { return x + 1; } ();
   }
+  x = [=]() { return x + 1; }();
 
   // CHECK-3: %[[Capture:struct\.anon[\.0-9]*]] = type { i32* }
 
diff --git a/test/OpenMP/for_lastprivate_codegen.cpp b/test/OpenMP/for_lastprivate_codegen.cpp
index 2b1d6c3cf9..75f59f7d40 100644
--- a/test/OpenMP/for_lastprivate_codegen.cpp
+++ b/test/OpenMP/for_lastprivate_codegen.cpp
@@ -41,7 +41,7 @@ struct SS {
     for (a = 0; a < 2; ++a)
 #ifdef LAMBDA
       [&]() {
-        ++this->a, --b, (this)->c /= 1;
+        --this->a, ++b, (this)->c *= 2;
 #pragma omp parallel
 #pragma omp for lastprivate(b)
         for (b = 0; b < 2; ++b)
@@ -190,7 +190,7 @@ int main() {
     // LAMBDA: call void (%{{.+}}*, i{{[0-9]+}}, void (i{{[0-9]+}}*, i{{[0-9]+}}*, ...)*, ...) @__kmpc_fork_call(%{{.+}}* @{{.+}}, i{{[0-9]+}} 1, void (i{{[0-9]+}}*, i{{[0-9]+}}*, ...)* bitcast (void (i{{[0-9]+}}*, i{{[0-9]+}}*, [[SS_TY]]*)* [[SS_MICROTASK:@.+]] to void
     // LAMBDA: call void @__kmpc_for_static_init_4(
     // LAMBDA-NOT: getelementptr inbounds [[SS_TY]], [[SS_TY]]* %{{.+}}, i32 0, i32 0
-    // LAMBDA: call void {{.+}} [[SS_LAMBDA:@[^ ]+]]
+    // LAMBDA: call{{.*}} void [[SS_LAMBDA1:@[^ ]+]]
     // LAMBDA: call void @__kmpc_for_static_fini(%
     // LAMBDA: ret
 
@@ -200,7 +200,7 @@ int main() {
     // LAMBDA: getelementptr {{.*}}[[SS_TY]], [[SS_TY]]* %{{.*}}, i32 0, i32 2
     // LAMBDA: call void @__kmpc_for_static_init_4(
     // LAMBDA-NOT: getelementptr {{.*}}[[SS_TY]], [[SS_TY]]*
-    // LAMBDA: call{{.*}} void
+    // LAMBDA: call{{.*}} void [[SS_LAMBDA:@[^ ]+]]
     // LAMBDA: call void @__kmpc_for_static_fini(
     // LAMBDA: br i1
     // LAMBDA: [[B_REF:%.+]] = getelementptr {{.*}}[[SS_TY]], [[SS_TY]]* %{{.*}}, i32 0, i32 1
@@ -236,6 +236,9 @@ int main() {
     // LAMBDA: br label
     // LAMBDA: ret void
 
+    // LAMBDA: define internal void @{{.+}}(i{{[0-9]+}}* noalias [[GTID_ADDR:%.+]], i{{[0-9]+}}* noalias %{{.+}}, [[SS_TY]]* %{{.+}})
+    // LAMBDA: ret void
+
     // LAMBDA: define{{.*}} internal{{.*}} void [[OMP_REGION]](i32* noalias %{{.+}}, i32* noalias %{{.+}}, i32* dereferenceable(4) [[SIVAR:%.+]])
     // LAMBDA: alloca i{{[0-9]+}},
     // LAMBDA: alloca i{{[0-9]+}},
diff --git a/test/OpenMP/target_map_codegen.cpp b/test/OpenMP/target_map_codegen.cpp
index 1a41c130c2..678e774566 100644
--- a/test/OpenMP/target_map_codegen.cpp
+++ b/test/OpenMP/target_map_codegen.cpp
@@ -4074,7 +4074,9 @@ int explicit_maps_with_inner_lambda(int a){
 // CK25: [[VAL1:%.+]] = load i32*, i32** [[VALADDR]],
 // CK25: [[VALADDR1:%.+]] = getelementptr inbounds [[CA01]], [[CA01]]* [[CA:%[^,]+]], i32 0, i32 0
 // CK25: store i32* [[VAL1]], i32** [[VALADDR1]],
-// CK25: call void {{.*}}[[LAMBDA]]{{.*}}([[CA01]]* [[CA]])
+// CK25: call void {{.*}}[[LAMBDA2:@.+]]{{.*}}([[CA01]]* [[CA]])
+
+// CK25: define {{.+}}[[LAMBDA2]]
 #endif
 ///==========================================================================///
 // RUN: %clang_cc1 -DCK26 -std=c++11 -verify -fopenmp -fopenmp-targets=powerpc64le-ibm-linux-gnu -x c++ -triple powerpc64le-unknown-unknown -emit-llvm %s -o - | FileCheck %s --check-prefix CK26 --check-prefix CK26-64