Merging r302817:
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r302817 | rsmith | 2017-05-11 14:58:24 -0400 (Thu, 11 May 2017) | 9 lines
PR22877: When constructing an array via a constructor with a default argument
in list-initialization, run cleanups for the default argument after each
iteration of the initialization loop.
We previously only ran the destructor for any temporary once, at the end of the
complete loop, rather than once per iteration!
Re-commit of r302750, reverted in r302776.
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_40@303167 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGExprAgg.cpp b/lib/CodeGen/CGExprAgg.cpp
index 0092447..b10a549 100644
--- a/lib/CodeGen/CGExprAgg.cpp
+++ b/lib/CodeGen/CGExprAgg.cpp
@@ -505,12 +505,20 @@
currentElement->addIncoming(element, entryBB);
// Emit the actual filler expression.
- LValue elementLV =
- CGF.MakeAddrLValue(Address(currentElement, elementAlign), elementType);
- if (filler)
- EmitInitializationToLValue(filler, elementLV);
- else
- EmitNullInitializationToLValue(elementLV);
+ {
+ // C++1z [class.temporary]p5:
+ // when a default constructor is called to initialize an element of
+ // an array with no corresponding initializer [...] the destruction of
+ // every temporary created in a default argument is sequenced before
+ // the construction of the next array element, if any
+ CodeGenFunction::RunCleanupsScope CleanupsScope(CGF);
+ LValue elementLV =
+ CGF.MakeAddrLValue(Address(currentElement, elementAlign), elementType);
+ if (filler)
+ EmitInitializationToLValue(filler, elementLV);
+ else
+ EmitNullInitializationToLValue(elementLV);
+ }
// Move on to the next element.
llvm::Value *nextElement =
diff --git a/test/CodeGenCXX/array-default-argument.cpp b/test/CodeGenCXX/array-default-argument.cpp
new file mode 100644
index 0000000..8376b4f
--- /dev/null
+++ b/test/CodeGenCXX/array-default-argument.cpp
@@ -0,0 +1,36 @@
+// RUN: %clang_cc1 -emit-llvm -o - %s -triple %itanium_abi_triple | FileCheck %s
+// RUN: %clang_cc1 -emit-llvm -o - %s -triple %itanium_abi_triple -fexceptions -fcxx-exceptions | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-EH
+
+struct A {
+ A();
+ ~A();
+};
+
+struct B {
+ B(A = A());
+ ~B();
+};
+
+void f();
+// CHECK-LABEL: define void @_Z1gv()
+void g() {
+ // CHECK: br label %[[LOOP:.*]]
+
+ // [[LOOP]]:
+ // CHECK: {{call|invoke}} {{.*}} @_ZN1AC1Ev([[TEMPORARY:.*]])
+ // CHECK-EH: unwind label %[[PARTIAL_ARRAY_LPAD:.*]]
+ // CHECK: {{call|invoke}} {{.*}} @_ZN1BC1E1A({{.*}}, [[TEMPORARY]])
+ // CHECK-EH: unwind label %[[A_AND_PARTIAL_ARRAY_LPAD:.*]]
+ // CHECK: {{call|invoke}} {{.*}} @_ZN1AD1Ev([[TEMPORARY]])
+ // CHECK-EH: unwind label %[[PARTIAL_ARRAY_LPAD]]
+ // CHECK: getelementptr {{.*}}, i{{[0-9]*}} 1
+ // CHECK: icmp eq
+ // CHECK: br i1 {{.*}} label %[[LOOP]]
+ B b[5];
+
+ // CHECK: {{call|invoke}} void @_Z1fv()
+ f();
+
+ // CHECK-NOT: @_ZN1AD1Ev(
+ // CHECK: {{call|invoke}} {{.*}} @_ZN1BD1Ev(
+}
