clang/test/CodeGenCXX/debug-info-nrvo.cpp

   1 // RUN: %clangxx -target x86_64-unknown-unknown -g \
   2 // RUN:   %s -emit-llvm -S -o - | FileCheck %s
   3
   4 // RUN: %clangxx -target x86_64-unknown-unknown -g \
   5 // RUN:   -fno-elide-constructors %s -emit-llvm -S -o - | \
   6 // RUN:   FileCheck %s -check-prefix=NOELIDE
   7
   8 struct Foo {
   9   Foo() = default;
  10   Foo(Foo &&other) { x = other.x; }
  11   int x;
  12 };
  13 void some_function(int);
  14 Foo getFoo() {
  15   Foo foo;
  16   foo.x = 41;
  17   some_function(foo.x);
  18   return foo;
  19 }
  20
  21 int main() {
  22   Foo bar = getFoo();
  23   return bar.x;
  24 }
  25
  26 // Check that NRVO variables are stored as a pointer with deref if they are
  27 // stored in the return register.
  28
  29 // CHECK: %[[RESULT:.*]] = alloca ptr, align 8
  30 // CHECK: call void @llvm.dbg.declare(metadata ptr %[[RESULT]],
  31 // CHECK-SAME: metadata !DIExpression(DW_OP_deref)
  32
  33 // NOELIDE: %[[FOO:.*]] = alloca %struct.Foo, align 4
  34 // NOELIDE: call void @llvm.dbg.declare(metadata ptr %[[FOO]],
  35 // NOELIDE-SAME:                        metadata !DIExpression()