re PR other/78252 (C++ demangler crashes with infinite recursion with lambda (auto))

	libiberty/
	PR c++/78252
	* cp-demangle.c (struct d_print_info): Add is_lambda_arg field.
	(d_print_init): Initialize it.
	(d_print_comp_inner) <DEMANGLE_COMPONENT_TEMPLATE_PARAM>: Check
	is_lambda_arg for auto.
	<DEMANGLE_COMPONENT_REFERENCE,
	DEMANGLE_COMPONENT_RVALUE_REFERENCE>: Skip smashing check when
	is_lambda_arg.
	<DEMANGLE_COMPONENT_LAMBDA>: Increment is_lambda_arg around arg
	printing.
	* testsuite/demangle-expected: Add lambda auto mangling cases.

	gcc/testsuite/
	PR c++/78252
	* g++.dg/cpp1y/lambda-mangle-1.C: New.

From-SVN: r243566

2 files changed, 93 insertions, 0 deletions

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 5105869..982a203 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2016-12-12  Nathan Sidwell  <nathan@acm.org>
+
+	PR c++/78252
+	* g++.dg/cpp1y/lambda-mangle-1.C: New.
+
 2016-12-12  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR target/78738
diff --git a/gcc/testsuite/g++.dg/cpp1y/lambda-mangle-1.C b/gcc/testsuite/g++.dg/cpp1y/lambda-mangle-1.C
new file mode 100644
index 0000000..ca0910b
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp1y/lambda-mangle-1.C
@@ -0,0 +1,88 @@
+// { dg-do compile { target c++14 } }
+
+// PRs 78621
+
+// We erroneously mangled lambda auto parms as-if template parameters (T<n>_),
+// rather than auto (Da). Fixed in abi version 11
+
+template<typename T> class X;
+
+template<typename T>
+T &&forward (T &v)
+{
+  return static_cast<T &&> (v);
+}
+
+template<typename T>
+void eat (T &v)
+{
+}
+
+template<typename S, typename T>
+  void eat (S &, T &v)
+{
+}
+
+void Foo ()
+{
+  auto lam = [](auto &) { };
+  auto lam_1 = [](int &, auto &) { };
+  auto lam_2 = [](auto &, X<int> &) { };
+  auto lam_3 = [](auto (*)[5]) { };
+
+  forward (lam);
+  forward (lam_1);
+  forward (lam_2);
+  forward (lam_3);
+
+  eat (lam);
+  eat (lam_1);
+  eat (lam_2);
+  eat (lam_3);
+
+  // The auto lambda should mangle similarly to the non-auto one
+  auto lambda_1 = [](float *, float *) { };
+  auto lambda_2 = [](auto *, auto *) { };
+  auto lambda_3 = [](auto *, auto *) { };
+
+  int *i;
+  
+  eat (i, lambda_1);
+  eat (i, lambda_2);
+
+  // The autos should squangle to the first one.
+  eat (lambda_2, lambda_3);
+}
+
+template<typename X> void Bar ()
+{
+  auto lambda_1 = [](X *, float *, float *) { };
+  auto lambda_2 = [](X *, auto *, auto *) { };
+  auto lambda_3 = [](X *, auto *...) {};
+  
+  int *i;
+  
+  eat (i, lambda_1);
+  eat (i, lambda_2);
+  eat (i, lambda_3);
+}
+
+void Baz ()
+{
+  Bar<short> ();
+}
+
+// { dg-final { scan-assembler "_Z7forwardIZ3FoovEUlRT_E_EOS0_S1_:" } }
+// { dg-final { scan-assembler "_Z7forwardIZ3FoovEUlRiRT_E0_EOS1_S2_:" } }
+// { dg-final { scan-assembler "_Z7forwardIZ3FoovEUlRT_R1XIiEE1_EOS0_S1_:" } }
+// { dg-final { scan-assembler "_Z7forwardIZ3FoovEUlPA5_T_E2_EOS0_RS0_:" } }
+// { dg-final { scan-assembler "_Z3eatIZ3FoovEUlRT_E_EvS1_:" } }
+// { dg-final { scan-assembler "_Z3eatIZ3FoovEUlRiRT_E0_EvS2_:" } }
+// { dg-final { scan-assembler "_Z3eatIZ3FoovEUlRT_R1XIiEE1_EvS1_:" } }
+// { dg-final { scan-assembler "_Z3eatIZ3FoovEUlPA5_T_E2_EvRS0_:" } }
+// { dg-final { scan-assembler "_Z3eatIPiZ3FoovEUlPfS1_E3_EvRT_RT0_:" } }
+// { dg-final { scan-assembler "_Z3eatIPiZ3FoovEUlPT_PT0_E4_EvRS1_RS3_:" } }
+// { dg-final { scan-assembler "_Z3eatIZ3FoovEUlPT_PT0_E4_Z3FoovEUlS1_S3_E5_EvRS0_RS2_:" } }
+// { dg-final { scan-assembler "_Z3eatIPiZ3BarIsEvvEUlPsPfS3_E_EvRT_RT0_:" } }
+// { dg-final { scan-assembler "_Z3eatIPiZ3BarIsEvvEUlPsPT_PT0_E0_EvRS3_RS5_:" } }
+// { dg-final { scan-assembler "_Z3eatIPiZ3BarIsEvvEUlPsPT_zE1_EvRS3_RT0_:" } }