diff mbox

[RFA] Fix c++/16597 (crash when inspecting lambda expression variables)

Message ID 532C7A56.8010201@redhat.com
State Committed
Headers show

Commit Message

Keith Seitz March 21, 2014, 5:43 p.m. UTC
Hi,

Consider the following lambda (from the test case):

     int ret = fudge ([this] () {
         return a_;   /* break here */
       });

Breaking at "break here" and printing "a_" will cause gdb to crash with 
clang++ (3.3).

This happens because lookup_symbol_file tries trying to locate a member 
variable with the name "a_":

       /* A simple lookup failed.  Check if the symbol was defined in
          a base class.  */

       cleanup = make_cleanup (null_cleanup, NULL);

       /* Find the name of the class and the name of the method,
          variable, etc.  */
       prefix_len = cp_entire_prefix_len (name);

       /* If no prefix was found, search "this".  */
       if (prefix_len == 0)
         {
           struct type *type;
           struct symbol *this;

           this = lookup_language_this (language_def (language_cplus), 
block);
           if (this == NULL)
             {
               do_cleanups (cleanup);
               return NULL;
             }

           type = check_typedef (TYPE_TARGET_TYPE (SYMBOL_TYPE (this)));
           klass = xstrdup (TYPE_NAME (type));
           nested = xstrdup (name);
         }

TYPE_NAME (type) is NULL, so xstrdup (NULL) and boom!

This occurs because of the DWARF that clang++ outputs. IMO, the output, 
while valid DWARF, is nonsensical from a C++ perspective:

  <2><135>: Abbrev Number: 20 (DW_TAG_subprogram)
     <136>   DW_AT_specification: <0x8a>
     <13a>   DW_AT_low_pc      : 0x400640
     <142>   DW_AT_high_pc     : 0x400653
     <14a>   DW_AT_frame_base  : 1 byte block: 56        (DW_OP_reg6 (rbp))
     <14c>   DW_AT_object_pointer: <0x150>
  <3><150>: Abbrev Number: 21 (DW_TAG_formal_parameter)
     <151>   DW_AT_name        : (indirect string, offset: 0x60): this
     <155>   DW_AT_decl_file   : 1
     <156>   DW_AT_decl_line   : 6
     <157>   DW_AT_type        : <0x211>
     <15b>   DW_AT_artificial  : 1
     <15b>   DW_AT_location    : 2 byte block: 91 78     (DW_OP_fbreg: -8)
  <2><15f>: Abbrev Number: 21 (DW_TAG_formal_parameter)
     <160>   DW_AT_name        : (indirect string, offset: 0x60): this
     <164>   DW_AT_decl_file   : 1
     <165>   DW_AT_decl_line   : 5
     <166>   DW_AT_type        : <0x5e>
     <16a>   DW_AT_artificial  : 1
     <16a>   DW_AT_location    : 2 byte block: 91 78     (DW_OP_fbreg: -8)

The nonsensical part of this is the output of two variables named 
`this', one artificial and one concrete.

In any case, the type of `this' (the artificial one) is given by DIE 0x211:
  <1><63>: Abbrev Number: 6 (DW_TAG_const_type)
     <64>   DW_AT_type        : <0x77>
[snip]
  <1><77>: Abbrev Number: 8 (DW_TAG_class_type)
     <78>   DW_AT_byte_size   : 8
     <79>   DW_AT_decl_file   : 1
     <7a>   DW_AT_decl_line   : 6
  <2><7b>: Abbrev Number: 9 (DW_TAG_member)
     <7c>   DW_AT_name        : (indirect string, offset: 0x60): this
     <80>   DW_AT_type        : <0x5e>
     <84>   DW_AT_decl_file   : 1
     <85>   DW_AT_decl_line   : 6
     <86>   DW_AT_data_member_location: 2 byte block: 23 0 
(DW_OP_plus_uconst: 0)
     <89>   DW_AT_accessibility: 3       (private)
[snip]
  <1><211>: Abbrev Number: 5 (DW_TAG_pointer_type)
     <212>   DW_AT_type        : <0x63>

As you can see, the compiler did not output DW_AT_name for this class.

The simple patch, of course, is to check for TYPE_NAME == NULL before 
continuing with lookup_symbol_file.

That was the easy part. The not-so-easy/questionable part is the test 
case, which uses the (assembler) output of the compiler to run against. 
Writing by hand is very time-consuming and tricky, because we must be 
stopped inside the lambda function in order to trigger the bug.

In any case, I thought I would submit this and see if anyone had any 
better ideas.

Keith
ChangeLog
2014-03-20  Keith Seitz  <keiths@redhat.com>

	PR c++/16597
	* cp-namespace.c (lookup_symbol_file): If the type name of
	`this' is NULL, return immediately.

testsuite/ChangeLog
2014-03-20  Keith Seitz  <keiths@redhat.com>

	PR c++/16597
	* gdb.cp/namelessclass.exp: New file.
	* gdb.cp/namelessclass.S: New file.

Comments

Tom Tromey April 10, 2014, 4:58 p.m. UTC | #1
>>>>> "Keith" == Keith Seitz <keiths@redhat.com> writes:

Keith> That was the easy part. The not-so-easy/questionable part is the test
Keith> case, which uses the (assembler) output of the compiler to run
Keith> against. Writing by hand is very time-consuming and tricky, because we
Keith> must be stopped inside the lambda function in order to trigger the
Keith> bug.

Keith> In any case, I thought I would submit this and see if anyone had any
Keith> better ideas.

I think it's fine to do this.

In the past we've done two additional things that make it slightly nicer.

First, we've checked in the original source file as a separate file, I
think along with a note in the .exp about it.  This approach lets you
avoid this:

Keith> +# WARNING: This is hard-coded from the original source file! This
Keith> +# breakpoint should be set inside the lambda in A::doit().

... since you can refer to comments in the original source file IIRC.


Second, I think we've edited the compilation directory in the .S file,
and maybe other little details as well (I had to edit the files to avoid
'main' for some reason I cannot remember):

Keith> +.Linfo_string2:
Keith> +	.asciz	 "/home/keiths/tmp/16597"

You can easily find some examples in gdb.dwarf2, just follow one of
those.

Tom
diff mbox

Patch

diff --git a/gdb/cp-namespace.c b/gdb/cp-namespace.c
index 74ccd45..cc9e417 100644
--- a/gdb/cp-namespace.c
+++ b/gdb/cp-namespace.c
@@ -669,6 +669,11 @@  lookup_symbol_file (const char *name,
 	    }
 
 	  type = check_typedef (TYPE_TARGET_TYPE (SYMBOL_TYPE (this)));
+	  /* If TYPE_NAME is NULL, abandon trying to find this symbol.
+	     This can happen for lambda functions compiled with clang++,
+	     which outputs no name for the container class.  */
+	  if (TYPE_NAME (type) == NULL)
+	    return NULL;
 	  klass = xstrdup (TYPE_NAME (type));
 	  nested = xstrdup (name);
 	}
diff --git a/gdb/testsuite/gdb.cp/namelessclass.S b/gdb/testsuite/gdb.cp/namelessclass.S
new file mode 100644
index 0000000..f06589d
--- /dev/null
+++ b/gdb/testsuite/gdb.cp/namelessclass.S
@@ -0,0 +1,919 @@ 
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2014 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* This file was generated using:
+
+   $ clang++ -g namelessclass.cc -std=c++11 -S -o namelessclass.S
+
+  with
+
+  $ clang++ -v
+  clang version 3.3 (tags/RELEASE_33/final)
+  Target: x86_64-redhat-linux-gnu
+  Thread model: posix
+
+  The original source file:
+
+  $ cat namelessclass.cc
+  class A
+  {
+   public:
+    A () : a_ (0xbeef) {}
+    int doit (void) {
+      int ret = fudge ([this] () {
+	  return a_;
+        });
+
+      return ret;
+    }
+
+   private:
+    template <typename Func>
+      int fudge (Func func) { return func (); }
+    int a_;
+  };
+
+  int
+  main (void)
+  {
+    A a;
+
+    return a.doit ();
+  }
+
+  This is a test for c++/16597.  */
+
+	.file	"namelessclass.cc"
+	.section	.debug_info,"",@progbits
+.Lsection_info:
+	.section	.debug_abbrev,"",@progbits
+.Lsection_abbrev:
+	.section	.debug_aranges,"",@progbits
+	.section	.debug_macinfo,"",@progbits
+	.section	.debug_line,"",@progbits
+.Lsection_line:
+	.section	.debug_loc,"",@progbits
+	.section	.debug_pubtypes,"",@progbits
+	.section	.debug_str,"MS",@progbits,1
+.Linfo_string:
+	.section	.debug_ranges,"",@progbits
+.Ldebug_range:
+	.section	.debug_loc,"",@progbits
+.Lsection_debug_loc:
+	.text
+.Ltext_begin:
+	.data
+	.file	1 "namelessclass.cc"
+	.text
+	.globl	main
+	.align	16, 0x90
+	.type	main,@function
+main:                                   # @main
+	.cfi_startproc
+.Lfunc_begin0:
+	.loc	1 21 0                  # namelessclass.cc:21:0
+# BB#0:
+	pushq	%rbp
+.Ltmp2:
+	.cfi_def_cfa_offset 16
+.Ltmp3:
+	.cfi_offset %rbp, -16
+	movq	%rsp, %rbp
+.Ltmp4:
+	.cfi_def_cfa_register %rbp
+	subq	$16, %rsp
+	leaq	-8(%rbp), %rdi
+	movl	$0, -4(%rbp)
+.Ltmp5:
+	#DEBUG_VALUE: main:a <- RDI+0
+	.loc	1 22 0 prologue_end     # namelessclass.cc:22:0
+	callq	_ZN1AC1Ev
+	leaq	-8(%rbp), %rdi
+.Ltmp6:
+	.loc	1 24 0                  # namelessclass.cc:24:0
+	callq	_ZN1A4doitEv
+	addq	$16, %rsp
+	popq	%rbp
+	ret
+.Ltmp7:
+.Ltmp8:
+	.size	main, .Ltmp8-main
+.Lfunc_end0:
+	.cfi_endproc
+
+	.section	.text._ZN1AC1Ev,"axG",@progbits,_ZN1AC1Ev,comdat
+	.weak	_ZN1AC1Ev
+	.align	16, 0x90
+	.type	_ZN1AC1Ev,@function
+_ZN1AC1Ev:                              # @_ZN1AC1Ev
+	.cfi_startproc
+.Lfunc_begin1:
+	.loc	1 4 0                   # namelessclass.cc:4:0
+# BB#0:
+	pushq	%rbp
+.Ltmp11:
+	.cfi_def_cfa_offset 16
+.Ltmp12:
+	.cfi_offset %rbp, -16
+	movq	%rsp, %rbp
+.Ltmp13:
+	.cfi_def_cfa_register %rbp
+	subq	$16, %rsp
+	movq	%rdi, -8(%rbp)
+	movq	-8(%rbp), %rdi
+	.loc	1 4 0 prologue_end      # namelessclass.cc:4:0
+.Ltmp14:
+	callq	_ZN1AC2Ev
+	addq	$16, %rsp
+	popq	%rbp
+	ret
+.Ltmp15:
+.Ltmp16:
+	.size	_ZN1AC1Ev, .Ltmp16-_ZN1AC1Ev
+.Lfunc_end1:
+	.cfi_endproc
+
+	.section	.text._ZN1A4doitEv,"axG",@progbits,_ZN1A4doitEv,comdat
+	.weak	_ZN1A4doitEv
+	.align	16, 0x90
+	.type	_ZN1A4doitEv,@function
+_ZN1A4doitEv:                           # @_ZN1A4doitEv
+	.cfi_startproc
+.Lfunc_begin2:
+	.loc	1 5 0                   # namelessclass.cc:5:0
+# BB#0:
+	pushq	%rbp
+.Ltmp19:
+	.cfi_def_cfa_offset 16
+.Ltmp20:
+	.cfi_offset %rbp, -16
+	movq	%rsp, %rbp
+.Ltmp21:
+	.cfi_def_cfa_register %rbp
+	subq	$32, %rsp
+	movq	%rdi, -8(%rbp)
+	movq	-8(%rbp), %rdi
+	.loc	1 6 0 prologue_end      # namelessclass.cc:6:0
+.Ltmp22:
+	movq	%rdi, -24(%rbp)
+	movq	-24(%rbp), %rsi
+	callq	_ZN1A5fudgeIZNS_4doitEvEUlvE_EEiT_
+	movl	%eax, -12(%rbp)
+	.loc	1 10 0                  # namelessclass.cc:10:0
+	movl	-12(%rbp), %eax
+	addq	$32, %rsp
+	popq	%rbp
+	ret
+.Ltmp23:
+.Ltmp24:
+	.size	_ZN1A4doitEv, .Ltmp24-_ZN1A4doitEv
+.Lfunc_end2:
+	.cfi_endproc
+
+	.section	.text._ZN1A5fudgeIZNS_4doitEvEUlvE_EEiT_,"axG",@progbits,_ZN1A5fudgeIZNS_4doitEvEUlvE_EEiT_,comdat
+	.weak	_ZN1A5fudgeIZNS_4doitEvEUlvE_EEiT_
+	.align	16, 0x90
+	.type	_ZN1A5fudgeIZNS_4doitEvEUlvE_EEiT_,@function
+_ZN1A5fudgeIZNS_4doitEvEUlvE_EEiT_:     # @_ZN1A5fudgeIZNS_4doitEvEUlvE_EEiT_
+	.cfi_startproc
+.Lfunc_begin3:
+	.loc	1 15 0                  # namelessclass.cc:15:0
+# BB#0:
+	pushq	%rbp
+.Ltmp27:
+	.cfi_def_cfa_offset 16
+.Ltmp28:
+	.cfi_offset %rbp, -16
+	movq	%rsp, %rbp
+.Ltmp29:
+	.cfi_def_cfa_register %rbp
+	subq	$16, %rsp
+	leaq	-16(%rbp), %rax
+	movq	%rdi, -8(%rbp)
+	movq	%rsi, -16(%rbp)
+	#DEBUG_VALUE: fudge<<lambda at namelessclass.cc:6:22> >:func <- RAX+0
+	.loc	1 15 34 prologue_end    # namelessclass.cc:15:34
+.Ltmp30:
+	movq	%rax, %rdi
+	callq	_ZZN1A4doitEvENKUlvE_clEv
+.Ltmp31:
+	addq	$16, %rsp
+	popq	%rbp
+	ret
+.Ltmp32:
+.Ltmp33:
+	.size	_ZN1A5fudgeIZNS_4doitEvEUlvE_EEiT_, .Ltmp33-_ZN1A5fudgeIZNS_4doitEvEUlvE_EEiT_
+.Lfunc_end3:
+	.cfi_endproc
+
+	.section	.text._ZZN1A4doitEvENKUlvE_clEv,"axG",@progbits,_ZZN1A4doitEvENKUlvE_clEv,comdat
+	.weak	_ZZN1A4doitEvENKUlvE_clEv
+	.align	16, 0x90
+	.type	_ZZN1A4doitEvENKUlvE_clEv,@function
+_ZZN1A4doitEvENKUlvE_clEv:              # @_ZZN1A4doitEvENKUlvE_clEv
+	.cfi_startproc
+.Lfunc_begin4:
+	.loc	1 6 0                   # namelessclass.cc:6:0
+# BB#0:
+	pushq	%rbp
+.Ltmp36:
+	.cfi_def_cfa_offset 16
+.Ltmp37:
+	.cfi_offset %rbp, -16
+	movq	%rsp, %rbp
+.Ltmp38:
+	.cfi_def_cfa_register %rbp
+	movq	%rdi, -8(%rbp)
+	movq	-8(%rbp), %rdi
+	movq	(%rdi), %rdi
+	.loc	1 7 0 prologue_end      # namelessclass.cc:7:0
+.Ltmp39:
+	movl	(%rdi), %eax
+	popq	%rbp
+	ret
+.Ltmp40:
+.Ltmp41:
+	.size	_ZZN1A4doitEvENKUlvE_clEv, .Ltmp41-_ZZN1A4doitEvENKUlvE_clEv
+.Lfunc_end4:
+	.cfi_endproc
+
+	.section	.text._ZN1AC2Ev,"axG",@progbits,_ZN1AC2Ev,comdat
+	.weak	_ZN1AC2Ev
+	.align	16, 0x90
+	.type	_ZN1AC2Ev,@function
+_ZN1AC2Ev:                              # @_ZN1AC2Ev
+	.cfi_startproc
+.Lfunc_begin5:
+	.loc	1 4 0                   # namelessclass.cc:4:0
+# BB#0:
+	pushq	%rbp
+.Ltmp44:
+	.cfi_def_cfa_offset 16
+.Ltmp45:
+	.cfi_offset %rbp, -16
+	movq	%rsp, %rbp
+.Ltmp46:
+	.cfi_def_cfa_register %rbp
+	movq	%rdi, -8(%rbp)
+	movq	-8(%rbp), %rdi
+	.loc	1 4 0 prologue_end      # namelessclass.cc:4:0
+.Ltmp47:
+	movl	$0, (%rdi)
+	popq	%rbp
+	ret
+.Ltmp48:
+.Ltmp49:
+	.size	_ZN1AC2Ev, .Ltmp49-_ZN1AC2Ev
+.Lfunc_end5:
+	.cfi_endproc
+
+	.text
+.Ltext_end:
+	.data
+.Ldata_end:
+	.text
+.Lsection_end1:
+	.section	.debug_info,"",@progbits
+.L.debug_info_begin0:
+	.long	531                     # Length of Compilation Unit Info
+	.short	2                       # DWARF version number
+	.long	.L.debug_abbrev_begin   # Offset Into Abbrev. Section
+	.byte	8                       # Address Size (in bytes)
+	.byte	1                       # Abbrev [1] 0xb:0x20c DW_TAG_compile_unit
+	.long	.Linfo_string0          # DW_AT_producer
+	.short	4                       # DW_AT_language
+	.long	.Linfo_string1          # DW_AT_name
+	.quad	0                       # DW_AT_low_pc
+	.long	.Lsection_line          # DW_AT_stmt_list
+	.long	.Linfo_string2          # DW_AT_comp_dir
+	.byte	2                       # Abbrev [2] 0x26:0x2c DW_TAG_subprogram
+	.long	.Linfo_string3          # DW_AT_name
+	.byte	1                       # DW_AT_decl_file
+	.byte	20                      # DW_AT_decl_line
+	.long	82                      # DW_AT_type
+                                        # DW_AT_external
+	.quad	.Lfunc_begin0           # DW_AT_low_pc
+	.quad	.Lfunc_end0             # DW_AT_high_pc
+	.byte	1                       # DW_AT_frame_base
+	.byte	86
+	.byte	3                       # Abbrev [3] 0x43:0xe DW_TAG_variable
+	.long	.Linfo_string15         # DW_AT_name
+	.byte	1                       # DW_AT_decl_file
+	.byte	22                      # DW_AT_decl_line
+	.long	186                     # DW_AT_type
+	.byte	2                       # DW_AT_location
+	.byte	145
+	.byte	120
+	.byte	0                       # End Of Children Mark
+	.byte	4                       # Abbrev [4] 0x52:0x7 DW_TAG_base_type
+	.long	.Linfo_string4          # DW_AT_name
+	.byte	5                       # DW_AT_encoding
+	.byte	4                       # DW_AT_byte_size
+	.byte	5                       # Abbrev [5] 0x59:0x5 DW_TAG_pointer_type
+	.long	186                     # DW_AT_type
+	.byte	5                       # Abbrev [5] 0x5e:0x5 DW_TAG_pointer_type
+	.long	186                     # DW_AT_type
+	.byte	6                       # Abbrev [6] 0x63:0x5 DW_TAG_const_type
+	.long	119                     # DW_AT_type
+	.byte	5                       # Abbrev [5] 0x68:0x5 DW_TAG_pointer_type
+	.long	99                      # DW_AT_type
+	.byte	5                       # Abbrev [5] 0x6d:0x5 DW_TAG_pointer_type
+	.long	119                     # DW_AT_type
+	.byte	7                       # Abbrev [7] 0x72:0x5 DW_TAG_rvalue_reference_type
+	.long	119                     # DW_AT_type
+	.byte	8                       # Abbrev [8] 0x77:0x43 DW_TAG_class_type
+	.byte	8                       # DW_AT_byte_size
+	.byte	1                       # DW_AT_decl_file
+	.byte	6                       # DW_AT_decl_line
+	.byte	9                       # Abbrev [9] 0x7b:0xf DW_TAG_member
+	.long	.Linfo_string7          # DW_AT_name
+	.long	94                      # DW_AT_type
+	.byte	1                       # DW_AT_decl_file
+	.byte	6                       # DW_AT_decl_line
+	.byte	2                       # DW_AT_data_member_location
+	.byte	35
+	.byte	0
+	.byte	3                       # DW_AT_accessibility
+                                        # DW_ACCESS_private
+	.byte	10                      # Abbrev [10] 0x8a:0x12 DW_TAG_subprogram
+	.long	.Linfo_string8          # DW_AT_name
+	.byte	1                       # DW_AT_decl_file
+	.byte	6                       # DW_AT_decl_line
+	.long	82                      # DW_AT_type
+                                        # DW_AT_declaration
+                                        # DW_AT_external
+	.byte	1                       # DW_AT_accessibility
+                                        # DW_ACCESS_public
+	.byte	11                      # Abbrev [11] 0x96:0x5 DW_TAG_formal_parameter
+	.long	104                     # DW_AT_type
+                                        # DW_AT_artificial
+	.byte	0                       # End Of Children Mark
+	.byte	12                      # Abbrev [12] 0x9c:0xe DW_TAG_subprogram
+	.long	.Linfo_string9          # DW_AT_name
+	.byte	1                       # DW_AT_decl_file
+	.byte	6                       # DW_AT_decl_line
+                                        # DW_AT_declaration
+                                        # DW_AT_artificial
+                                        # DW_AT_external
+	.byte	1                       # DW_AT_accessibility
+                                        # DW_ACCESS_public
+	.byte	11                      # Abbrev [11] 0xa4:0x5 DW_TAG_formal_parameter
+	.long	109                     # DW_AT_type
+                                        # DW_AT_artificial
+	.byte	0                       # End Of Children Mark
+	.byte	13                      # Abbrev [13] 0xaa:0xf DW_TAG_subprogram
+	.byte	1                       # DW_AT_decl_file
+	.byte	6                       # DW_AT_decl_line
+                                        # DW_AT_declaration
+                                        # DW_AT_artificial
+                                        # DW_AT_external
+	.byte	1                       # DW_AT_accessibility
+                                        # DW_ACCESS_public
+	.byte	11                      # Abbrev [11] 0xae:0x5 DW_TAG_formal_parameter
+	.long	109                     # DW_AT_type
+                                        # DW_AT_artificial
+	.byte	14                      # Abbrev [14] 0xb3:0x5 DW_TAG_formal_parameter
+	.long	114                     # DW_AT_type
+	.byte	0                       # End Of Children Mark
+	.byte	0                       # End Of Children Mark
+	.byte	15                      # Abbrev [15] 0xba:0x60 DW_TAG_class_type
+	.long	.Linfo_string6          # DW_AT_name
+	.byte	4                       # DW_AT_byte_size
+	.byte	1                       # DW_AT_decl_file
+	.byte	1                       # DW_AT_decl_line
+	.byte	9                       # Abbrev [9] 0xc2:0xf DW_TAG_member
+	.long	.Linfo_string5          # DW_AT_name
+	.long	82                      # DW_AT_type
+	.byte	1                       # DW_AT_decl_file
+	.byte	16                      # DW_AT_decl_line
+	.byte	2                       # DW_AT_data_member_location
+	.byte	35
+	.byte	0
+	.byte	3                       # DW_AT_accessibility
+                                        # DW_ACCESS_private
+	.byte	16                      # Abbrev [16] 0xd1:0xe DW_TAG_subprogram
+	.long	.Linfo_string6          # DW_AT_name
+	.byte	1                       # DW_AT_decl_file
+	.byte	4                       # DW_AT_decl_line
+                                        # DW_AT_declaration
+                                        # DW_AT_external
+	.byte	1                       # DW_AT_accessibility
+                                        # DW_ACCESS_public
+	.byte	11                      # Abbrev [11] 0xd9:0x5 DW_TAG_formal_parameter
+	.long	89                      # DW_AT_type
+                                        # DW_AT_artificial
+	.byte	0                       # End Of Children Mark
+	.byte	17                      # Abbrev [17] 0xdf:0x16 DW_TAG_subprogram
+	.byte	1                       # DW_AT_accessibility
+                                        # DW_ACCESS_public
+	.long	.Linfo_string13         # DW_AT_MIPS_linkage_name
+	.long	.Linfo_string14         # DW_AT_name
+	.byte	1                       # DW_AT_decl_file
+	.byte	5                       # DW_AT_decl_line
+	.long	82                      # DW_AT_type
+                                        # DW_AT_declaration
+                                        # DW_AT_external
+	.byte	11                      # Abbrev [11] 0xef:0x5 DW_TAG_formal_parameter
+	.long	89                      # DW_AT_type
+                                        # DW_AT_artificial
+	.byte	0                       # End Of Children Mark
+	.byte	18                      # Abbrev [18] 0xf5:0x24 DW_TAG_subprogram
+	.long	.Linfo_string11         # DW_AT_MIPS_linkage_name
+	.long	.Linfo_string12         # DW_AT_name
+	.byte	1                       # DW_AT_decl_file
+	.byte	15                      # DW_AT_decl_line
+	.long	82                      # DW_AT_type
+                                        # DW_AT_declaration
+                                        # DW_AT_external
+	.byte	3                       # DW_AT_accessibility
+                                        # DW_ACCESS_private
+	.byte	19                      # Abbrev [19] 0x105:0x9 DW_TAG_template_type_parameter
+	.long	119                     # DW_AT_type
+	.long	.Linfo_string10         # DW_AT_name
+	.byte	11                      # Abbrev [11] 0x10e:0x5 DW_TAG_formal_parameter
+	.long	89                      # DW_AT_type
+                                        # DW_AT_artificial
+	.byte	14                      # Abbrev [14] 0x113:0x5 DW_TAG_formal_parameter
+	.long	119                     # DW_AT_type
+	.byte	0                       # End Of Children Mark
+	.byte	0                       # End Of Children Mark
+	.byte	20                      # Abbrev [20] 0x11a:0x62 DW_TAG_subprogram
+	.long	223                     # DW_AT_specification
+	.quad	.Lfunc_begin2           # DW_AT_low_pc
+	.quad	.Lfunc_end2             # DW_AT_high_pc
+	.byte	1                       # DW_AT_frame_base
+	.byte	86
+	.long	351                     # DW_AT_object_pointer
+	.byte	20                      # Abbrev [20] 0x135:0x2a DW_TAG_subprogram
+	.long	138                     # DW_AT_specification
+	.quad	.Lfunc_begin4           # DW_AT_low_pc
+	.quad	.Lfunc_end4             # DW_AT_high_pc
+	.byte	1                       # DW_AT_frame_base
+	.byte	86
+	.long	336                     # DW_AT_object_pointer
+	.byte	21                      # Abbrev [21] 0x150:0xe DW_TAG_formal_parameter
+	.long	.Linfo_string7          # DW_AT_name
+	.byte	1                       # DW_AT_decl_file
+	.byte	6                       # DW_AT_decl_line
+	.long	529                     # DW_AT_type
+                                        # DW_AT_artificial
+	.byte	2                       # DW_AT_location
+	.byte	145
+	.byte	120
+	.byte	0                       # End Of Children Mark
+	.byte	21                      # Abbrev [21] 0x15f:0xe DW_TAG_formal_parameter
+	.long	.Linfo_string7          # DW_AT_name
+	.byte	1                       # DW_AT_decl_file
+	.byte	5                       # DW_AT_decl_line
+	.long	94                      # DW_AT_type
+                                        # DW_AT_artificial
+	.byte	2                       # DW_AT_location
+	.byte	145
+	.byte	120
+	.byte	3                       # Abbrev [3] 0x16d:0xe DW_TAG_variable
+	.long	.Linfo_string16         # DW_AT_name
+	.byte	1                       # DW_AT_decl_file
+	.byte	6                       # DW_AT_decl_line
+	.long	82                      # DW_AT_type
+	.byte	2                       # DW_AT_location
+	.byte	145
+	.byte	116
+	.byte	0                       # End Of Children Mark
+	.byte	20                      # Abbrev [20] 0x17c:0x41 DW_TAG_subprogram
+	.long	245                     # DW_AT_specification
+	.quad	.Lfunc_begin3           # DW_AT_low_pc
+	.quad	.Lfunc_end3             # DW_AT_high_pc
+	.byte	1                       # DW_AT_frame_base
+	.byte	86
+	.long	416                     # DW_AT_object_pointer
+	.byte	19                      # Abbrev [19] 0x197:0x9 DW_TAG_template_type_parameter
+	.long	119                     # DW_AT_type
+	.long	.Linfo_string10         # DW_AT_name
+	.byte	21                      # Abbrev [21] 0x1a0:0xe DW_TAG_formal_parameter
+	.long	.Linfo_string7          # DW_AT_name
+	.byte	1                       # DW_AT_decl_file
+	.byte	15                      # DW_AT_decl_line
+	.long	94                      # DW_AT_type
+                                        # DW_AT_artificial
+	.byte	2                       # DW_AT_location
+	.byte	145
+	.byte	120
+	.byte	22                      # Abbrev [22] 0x1ae:0xe DW_TAG_formal_parameter
+	.long	.Linfo_string17         # DW_AT_name
+	.byte	1                       # DW_AT_decl_file
+	.byte	15                      # DW_AT_decl_line
+	.long	119                     # DW_AT_type
+	.byte	2                       # DW_AT_location
+	.byte	145
+	.byte	112
+	.byte	0                       # End Of Children Mark
+	.byte	20                      # Abbrev [20] 0x1bd:0x2a DW_TAG_subprogram
+	.long	209                     # DW_AT_specification
+	.quad	.Lfunc_begin1           # DW_AT_low_pc
+	.quad	.Lfunc_end1             # DW_AT_high_pc
+	.byte	1                       # DW_AT_frame_base
+	.byte	86
+	.long	472                     # DW_AT_object_pointer
+	.byte	21                      # Abbrev [21] 0x1d8:0xe DW_TAG_formal_parameter
+	.long	.Linfo_string7          # DW_AT_name
+	.byte	1                       # DW_AT_decl_file
+	.byte	4                       # DW_AT_decl_line
+	.long	94                      # DW_AT_type
+                                        # DW_AT_artificial
+	.byte	2                       # DW_AT_location
+	.byte	145
+	.byte	120
+	.byte	0                       # End Of Children Mark
+	.byte	20                      # Abbrev [20] 0x1e7:0x2a DW_TAG_subprogram
+	.long	209                     # DW_AT_specification
+	.quad	.Lfunc_begin5           # DW_AT_low_pc
+	.quad	.Lfunc_end5             # DW_AT_high_pc
+	.byte	1                       # DW_AT_frame_base
+	.byte	86
+	.long	514                     # DW_AT_object_pointer
+	.byte	21                      # Abbrev [21] 0x202:0xe DW_TAG_formal_parameter
+	.long	.Linfo_string7          # DW_AT_name
+	.byte	1                       # DW_AT_decl_file
+	.byte	4                       # DW_AT_decl_line
+	.long	94                      # DW_AT_type
+                                        # DW_AT_artificial
+	.byte	2                       # DW_AT_location
+	.byte	145
+	.byte	120
+	.byte	0                       # End Of Children Mark
+	.byte	5                       # Abbrev [5] 0x211:0x5 DW_TAG_pointer_type
+	.long	99                      # DW_AT_type
+	.byte	0                       # End Of Children Mark
+.L.debug_info_end0:
+	.section	.debug_abbrev,"",@progbits
+.L.debug_abbrev_begin:
+	.byte	1                       # Abbreviation Code
+	.byte	17                      # DW_TAG_compile_unit
+	.byte	1                       # DW_CHILDREN_yes
+	.byte	37                      # DW_AT_producer
+	.byte	14                      # DW_FORM_strp
+	.byte	19                      # DW_AT_language
+	.byte	5                       # DW_FORM_data2
+	.byte	3                       # DW_AT_name
+	.byte	14                      # DW_FORM_strp
+	.byte	17                      # DW_AT_low_pc
+	.byte	1                       # DW_FORM_addr
+	.byte	16                      # DW_AT_stmt_list
+	.byte	6                       # DW_FORM_data4
+	.byte	27                      # DW_AT_comp_dir
+	.byte	14                      # DW_FORM_strp
+	.byte	0                       # EOM(1)
+	.byte	0                       # EOM(2)
+	.byte	2                       # Abbreviation Code
+	.byte	46                      # DW_TAG_subprogram
+	.byte	1                       # DW_CHILDREN_yes
+	.byte	3                       # DW_AT_name
+	.byte	14                      # DW_FORM_strp
+	.byte	58                      # DW_AT_decl_file
+	.byte	11                      # DW_FORM_data1
+	.byte	59                      # DW_AT_decl_line
+	.byte	11                      # DW_FORM_data1
+	.byte	73                      # DW_AT_type
+	.byte	19                      # DW_FORM_ref4
+	.byte	63                      # DW_AT_external
+	.byte	25                      # DW_FORM_flag_present
+	.byte	17                      # DW_AT_low_pc
+	.byte	1                       # DW_FORM_addr
+	.byte	18                      # DW_AT_high_pc
+	.byte	1                       # DW_FORM_addr
+	.byte	64                      # DW_AT_frame_base
+	.byte	10                      # DW_FORM_block1
+	.byte	0                       # EOM(1)
+	.byte	0                       # EOM(2)
+	.byte	3                       # Abbreviation Code
+	.byte	52                      # DW_TAG_variable
+	.byte	0                       # DW_CHILDREN_no
+	.byte	3                       # DW_AT_name
+	.byte	14                      # DW_FORM_strp
+	.byte	58                      # DW_AT_decl_file
+	.byte	11                      # DW_FORM_data1
+	.byte	59                      # DW_AT_decl_line
+	.byte	11                      # DW_FORM_data1
+	.byte	73                      # DW_AT_type
+	.byte	19                      # DW_FORM_ref4
+	.byte	2                       # DW_AT_location
+	.byte	10                      # DW_FORM_block1
+	.byte	0                       # EOM(1)
+	.byte	0                       # EOM(2)
+	.byte	4                       # Abbreviation Code
+	.byte	36                      # DW_TAG_base_type
+	.byte	0                       # DW_CHILDREN_no
+	.byte	3                       # DW_AT_name
+	.byte	14                      # DW_FORM_strp
+	.byte	62                      # DW_AT_encoding
+	.byte	11                      # DW_FORM_data1
+	.byte	11                      # DW_AT_byte_size
+	.byte	11                      # DW_FORM_data1
+	.byte	0                       # EOM(1)
+	.byte	0                       # EOM(2)
+	.byte	5                       # Abbreviation Code
+	.byte	15                      # DW_TAG_pointer_type
+	.byte	0                       # DW_CHILDREN_no
+	.byte	73                      # DW_AT_type
+	.byte	19                      # DW_FORM_ref4
+	.byte	0                       # EOM(1)
+	.byte	0                       # EOM(2)
+	.byte	6                       # Abbreviation Code
+	.byte	38                      # DW_TAG_const_type
+	.byte	0                       # DW_CHILDREN_no
+	.byte	73                      # DW_AT_type
+	.byte	19                      # DW_FORM_ref4
+	.byte	0                       # EOM(1)
+	.byte	0                       # EOM(2)
+	.byte	7                       # Abbreviation Code
+	.byte	66                      # DW_TAG_rvalue_reference_type
+	.byte	0                       # DW_CHILDREN_no
+	.byte	73                      # DW_AT_type
+	.byte	19                      # DW_FORM_ref4
+	.byte	0                       # EOM(1)
+	.byte	0                       # EOM(2)
+	.byte	8                       # Abbreviation Code
+	.byte	2                       # DW_TAG_class_type
+	.byte	1                       # DW_CHILDREN_yes
+	.byte	11                      # DW_AT_byte_size
+	.byte	11                      # DW_FORM_data1
+	.byte	58                      # DW_AT_decl_file
+	.byte	11                      # DW_FORM_data1
+	.byte	59                      # DW_AT_decl_line
+	.byte	11                      # DW_FORM_data1
+	.byte	0                       # EOM(1)
+	.byte	0                       # EOM(2)
+	.byte	9                       # Abbreviation Code
+	.byte	13                      # DW_TAG_member
+	.byte	0                       # DW_CHILDREN_no
+	.byte	3                       # DW_AT_name
+	.byte	14                      # DW_FORM_strp
+	.byte	73                      # DW_AT_type
+	.byte	19                      # DW_FORM_ref4
+	.byte	58                      # DW_AT_decl_file
+	.byte	11                      # DW_FORM_data1
+	.byte	59                      # DW_AT_decl_line
+	.byte	11                      # DW_FORM_data1
+	.byte	56                      # DW_AT_data_member_location
+	.byte	10                      # DW_FORM_block1
+	.byte	50                      # DW_AT_accessibility
+	.byte	11                      # DW_FORM_data1
+	.byte	0                       # EOM(1)
+	.byte	0                       # EOM(2)
+	.byte	10                      # Abbreviation Code
+	.byte	46                      # DW_TAG_subprogram
+	.byte	1                       # DW_CHILDREN_yes
+	.byte	3                       # DW_AT_name
+	.byte	14                      # DW_FORM_strp
+	.byte	58                      # DW_AT_decl_file
+	.byte	11                      # DW_FORM_data1
+	.byte	59                      # DW_AT_decl_line
+	.byte	11                      # DW_FORM_data1
+	.byte	73                      # DW_AT_type
+	.byte	19                      # DW_FORM_ref4
+	.byte	60                      # DW_AT_declaration
+	.byte	25                      # DW_FORM_flag_present
+	.byte	63                      # DW_AT_external
+	.byte	25                      # DW_FORM_flag_present
+	.byte	50                      # DW_AT_accessibility
+	.byte	11                      # DW_FORM_data1
+	.byte	0                       # EOM(1)
+	.byte	0                       # EOM(2)
+	.byte	11                      # Abbreviation Code
+	.byte	5                       # DW_TAG_formal_parameter
+	.byte	0                       # DW_CHILDREN_no
+	.byte	73                      # DW_AT_type
+	.byte	19                      # DW_FORM_ref4
+	.byte	52                      # DW_AT_artificial
+	.byte	25                      # DW_FORM_flag_present
+	.byte	0                       # EOM(1)
+	.byte	0                       # EOM(2)
+	.byte	12                      # Abbreviation Code
+	.byte	46                      # DW_TAG_subprogram
+	.byte	1                       # DW_CHILDREN_yes
+	.byte	3                       # DW_AT_name
+	.byte	14                      # DW_FORM_strp
+	.byte	58                      # DW_AT_decl_file
+	.byte	11                      # DW_FORM_data1
+	.byte	59                      # DW_AT_decl_line
+	.byte	11                      # DW_FORM_data1
+	.byte	60                      # DW_AT_declaration
+	.byte	25                      # DW_FORM_flag_present
+	.byte	52                      # DW_AT_artificial
+	.byte	25                      # DW_FORM_flag_present
+	.byte	63                      # DW_AT_external
+	.byte	25                      # DW_FORM_flag_present
+	.byte	50                      # DW_AT_accessibility
+	.byte	11                      # DW_FORM_data1
+	.byte	0                       # EOM(1)
+	.byte	0                       # EOM(2)
+	.byte	13                      # Abbreviation Code
+	.byte	46                      # DW_TAG_subprogram
+	.byte	1                       # DW_CHILDREN_yes
+	.byte	58                      # DW_AT_decl_file
+	.byte	11                      # DW_FORM_data1
+	.byte	59                      # DW_AT_decl_line
+	.byte	11                      # DW_FORM_data1
+	.byte	60                      # DW_AT_declaration
+	.byte	25                      # DW_FORM_flag_present
+	.byte	52                      # DW_AT_artificial
+	.byte	25                      # DW_FORM_flag_present
+	.byte	63                      # DW_AT_external
+	.byte	25                      # DW_FORM_flag_present
+	.byte	50                      # DW_AT_accessibility
+	.byte	11                      # DW_FORM_data1
+	.byte	0                       # EOM(1)
+	.byte	0                       # EOM(2)
+	.byte	14                      # Abbreviation Code
+	.byte	5                       # DW_TAG_formal_parameter
+	.byte	0                       # DW_CHILDREN_no
+	.byte	73                      # DW_AT_type
+	.byte	19                      # DW_FORM_ref4
+	.byte	0                       # EOM(1)
+	.byte	0                       # EOM(2)
+	.byte	15                      # Abbreviation Code
+	.byte	2                       # DW_TAG_class_type
+	.byte	1                       # DW_CHILDREN_yes
+	.byte	3                       # DW_AT_name
+	.byte	14                      # DW_FORM_strp
+	.byte	11                      # DW_AT_byte_size
+	.byte	11                      # DW_FORM_data1
+	.byte	58                      # DW_AT_decl_file
+	.byte	11                      # DW_FORM_data1
+	.byte	59                      # DW_AT_decl_line
+	.byte	11                      # DW_FORM_data1
+	.byte	0                       # EOM(1)
+	.byte	0                       # EOM(2)
+	.byte	16                      # Abbreviation Code
+	.byte	46                      # DW_TAG_subprogram
+	.byte	1                       # DW_CHILDREN_yes
+	.byte	3                       # DW_AT_name
+	.byte	14                      # DW_FORM_strp
+	.byte	58                      # DW_AT_decl_file
+	.byte	11                      # DW_FORM_data1
+	.byte	59                      # DW_AT_decl_line
+	.byte	11                      # DW_FORM_data1
+	.byte	60                      # DW_AT_declaration
+	.byte	25                      # DW_FORM_flag_present
+	.byte	63                      # DW_AT_external
+	.byte	25                      # DW_FORM_flag_present
+	.byte	50                      # DW_AT_accessibility
+	.byte	11                      # DW_FORM_data1
+	.byte	0                       # EOM(1)
+	.byte	0                       # EOM(2)
+	.byte	17                      # Abbreviation Code
+	.byte	46                      # DW_TAG_subprogram
+	.byte	1                       # DW_CHILDREN_yes
+	.byte	50                      # DW_AT_accessibility
+	.byte	11                      # DW_FORM_data1
+	.ascii	 "\207@"                # DW_AT_MIPS_linkage_name
+	.byte	14                      # DW_FORM_strp
+	.byte	3                       # DW_AT_name
+	.byte	14                      # DW_FORM_strp
+	.byte	58                      # DW_AT_decl_file
+	.byte	11                      # DW_FORM_data1
+	.byte	59                      # DW_AT_decl_line
+	.byte	11                      # DW_FORM_data1
+	.byte	73                      # DW_AT_type
+	.byte	19                      # DW_FORM_ref4
+	.byte	60                      # DW_AT_declaration
+	.byte	25                      # DW_FORM_flag_present
+	.byte	63                      # DW_AT_external
+	.byte	25                      # DW_FORM_flag_present
+	.byte	0                       # EOM(1)
+	.byte	0                       # EOM(2)
+	.byte	18                      # Abbreviation Code
+	.byte	46                      # DW_TAG_subprogram
+	.byte	1                       # DW_CHILDREN_yes
+	.ascii	 "\207@"                # DW_AT_MIPS_linkage_name
+	.byte	14                      # DW_FORM_strp
+	.byte	3                       # DW_AT_name
+	.byte	14                      # DW_FORM_strp
+	.byte	58                      # DW_AT_decl_file
+	.byte	11                      # DW_FORM_data1
+	.byte	59                      # DW_AT_decl_line
+	.byte	11                      # DW_FORM_data1
+	.byte	73                      # DW_AT_type
+	.byte	19                      # DW_FORM_ref4
+	.byte	60                      # DW_AT_declaration
+	.byte	25                      # DW_FORM_flag_present
+	.byte	63                      # DW_AT_external
+	.byte	25                      # DW_FORM_flag_present
+	.byte	50                      # DW_AT_accessibility
+	.byte	11                      # DW_FORM_data1
+	.byte	0                       # EOM(1)
+	.byte	0                       # EOM(2)
+	.byte	19                      # Abbreviation Code
+	.byte	47                      # DW_TAG_template_type_parameter
+	.byte	0                       # DW_CHILDREN_no
+	.byte	73                      # DW_AT_type
+	.byte	19                      # DW_FORM_ref4
+	.byte	3                       # DW_AT_name
+	.byte	14                      # DW_FORM_strp
+	.byte	0                       # EOM(1)
+	.byte	0                       # EOM(2)
+	.byte	20                      # Abbreviation Code
+	.byte	46                      # DW_TAG_subprogram
+	.byte	1                       # DW_CHILDREN_yes
+	.byte	71                      # DW_AT_specification
+	.byte	19                      # DW_FORM_ref4
+	.byte	17                      # DW_AT_low_pc
+	.byte	1                       # DW_FORM_addr
+	.byte	18                      # DW_AT_high_pc
+	.byte	1                       # DW_FORM_addr
+	.byte	64                      # DW_AT_frame_base
+	.byte	10                      # DW_FORM_block1
+	.byte	100                     # DW_AT_object_pointer
+	.byte	19                      # DW_FORM_ref4
+	.byte	0                       # EOM(1)
+	.byte	0                       # EOM(2)
+	.byte	21                      # Abbreviation Code
+	.byte	5                       # DW_TAG_formal_parameter
+	.byte	0                       # DW_CHILDREN_no
+	.byte	3                       # DW_AT_name
+	.byte	14                      # DW_FORM_strp
+	.byte	58                      # DW_AT_decl_file
+	.byte	11                      # DW_FORM_data1
+	.byte	59                      # DW_AT_decl_line
+	.byte	11                      # DW_FORM_data1
+	.byte	73                      # DW_AT_type
+	.byte	19                      # DW_FORM_ref4
+	.byte	52                      # DW_AT_artificial
+	.byte	25                      # DW_FORM_flag_present
+	.byte	2                       # DW_AT_location
+	.byte	10                      # DW_FORM_block1
+	.byte	0                       # EOM(1)
+	.byte	0                       # EOM(2)
+	.byte	22                      # Abbreviation Code
+	.byte	5                       # DW_TAG_formal_parameter
+	.byte	0                       # DW_CHILDREN_no
+	.byte	3                       # DW_AT_name
+	.byte	14                      # DW_FORM_strp
+	.byte	58                      # DW_AT_decl_file
+	.byte	11                      # DW_FORM_data1
+	.byte	59                      # DW_AT_decl_line
+	.byte	11                      # DW_FORM_data1
+	.byte	73                      # DW_AT_type
+	.byte	19                      # DW_FORM_ref4
+	.byte	2                       # DW_AT_location
+	.byte	10                      # DW_FORM_block1
+	.byte	0                       # EOM(1)
+	.byte	0                       # EOM(2)
+	.byte	0                       # EOM(3)
+.L.debug_abbrev_end:
+	.section	.debug_aranges,"",@progbits
+	.section	.debug_ranges,"",@progbits
+	.section	.debug_macinfo,"",@progbits
+	.section	.debug_str,"MS",@progbits,1
+.Linfo_string0:
+	.asciz	 "clang version 3.3 (tags/RELEASE_33/final)"
+.Linfo_string1:
+	.asciz	 "namelessclass.cc"
+.Linfo_string2:
+	.asciz	 "/home/keiths/tmp/16597"
+.Linfo_string3:
+	.asciz	 "main"
+.Linfo_string4:
+	.asciz	 "int"
+.Linfo_string5:
+	.asciz	 "a_"
+.Linfo_string6:
+	.asciz	 "A"
+.Linfo_string7:
+	.asciz	 "this"
+.Linfo_string8:
+	.asciz	 "operator()"
+.Linfo_string9:
+	.asciz	 "~"
+.Linfo_string10:
+	.asciz	 "Func"
+.Linfo_string11:
+	.asciz	 "_ZN1A5fudgeIZNS_4doitEvEUlvE_EEiT_"
+.Linfo_string12:
+	.asciz	 "fudge<<lambda at namelessclass.cc:6:22> >"
+.Linfo_string13:
+	.asciz	 "_ZN1A4doitEv"
+.Linfo_string14:
+	.asciz	 "doit"
+.Linfo_string15:
+	.asciz	 "a"
+.Linfo_string16:
+	.asciz	 "ret"
+.Linfo_string17:
+	.asciz	 "func"
+
+	.section	".note.GNU-stack","",@progbits
diff --git a/gdb/testsuite/gdb.cp/namelessclass.exp b/gdb/testsuite/gdb.cp/namelessclass.exp
new file mode 100644
index 0000000..6d6491a
--- /dev/null
+++ b/gdb/testsuite/gdb.cp/namelessclass.exp
@@ -0,0 +1,51 @@ 
+# Copyright 2014 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Test nameless, artificial classes that may be output by the compiler.
+# PR c++/16597
+
+load_lib dwarf.exp
+
+# Do not run in environments which do not support C++.
+if {[skip_cplus_tests]} {
+    continue
+}
+
+# This test can only be run on x86-like targets which support DWARF.
+if {![dwarf2_support]} {
+    return 0
+}
+
+if {![istarget "x86_64-*-*"]} {
+    return 0
+}
+
+standard_testfile .S
+
+if {[prepare_for_testing $testfile.exp $testfile $srcfile {nodebug}]} {
+    return -1
+}
+
+if {![runto_main]} {
+    return -1
+}
+
+# WARNING: This is hard-coded from the original source file! This
+# breakpoint should be set inside the lambda in A::doit().
+gdb_breakpoint "7"
+gdb_continue_to_breakpoint "continue to breakpoint at line 7"
+
+# Any output is accepted as valid as long as gdb does not segfault.
+gdb_test "print a_" ".*"