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gdb/gdb-entryval-1of2.patch
Jan Kratochvil 1054fa6d0b Rebase to FSF GDB 7.5.50.20130310 (pre-7.6 snapshot). 
- Fix various entry-values sub-optimal results.
2013-03-10 17:12:43 +01:00

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http://sourceware.org/ml/gdb-patches/2013-03/msg00061.html
Subject: [patch] entry-values: Fix for C++ across CUs
Hi,
I have found with C++ entry-values do not work much. This is a problem
primarily for 'this' being in $rdi clobbered very soon and having a function
with 'this=<optimized out>' is pretty useless for core crash analysis.
It happens if the call is across CUs, where GCC uses name reference:
<2><7c>: Abbrev Number: 6 (DW_TAG_GNU_call_site)
<7d> DW_AT_low_pc : 0x40049e
<85> DW_AT_abstract_origin: <0xa8>
<1><a8>: Abbrev Number: 10 (DW_TAG_subprogram)
<a9> DW_AT_external : 1
<a9> DW_AT_name : f
<ab> DW_AT_decl_file : 1
<ac> DW_AT_decl_line : 26
<ad> DW_AT_linkage_name: (indirect string, offset: 0x83): _Z1fi
<b1> DW_AT_declaration : 1
The testcase tests tail calls which is another (compared to unrecovered values
such as 'this') reproduction of the same problem:
Cannot find function "f(int)" for a call site target at 0x4004ae in main
#0 g (x=2) at gdb.arch/amd64-tailcall-cxx1.cc:23
#1 0x00000000004004ae in main () at gdb.arch/amd64-tailcall-cxx1.cc:31
->
#0 g (x=x@entry=2) at gdb.arch/amd64-tailcall-cxx1.cc:23
#1 0x00000000004005c8 in f (x=x@entry=1) at gdb.arch/amd64-tailcall-cxx2.cc:23
#2 0x00000000004004ae in main () at gdb.arch/amd64-tailcall-cxx1.cc:31
There are two different fixes below. The first one only always works but it
always uses the demangled name, which is not exact. The second fix provides
the mangled name (if available); the mangled name would not need the first fix
but the mangled name is sometimes not available - for example in Fedora GCC.
No regressions on {x86_64,x86_64-m32,i686}-fedora19pre-linux-gnu.
Probably nothing interesting, I will check it in.
Thanks,
Jan
gdb/
2013-03-02 Jan Kratochvil <jan.kratochvil@redhat.com>
Fix entry-values in C++ across CUs.
* dwarf2loc.c (call_site_to_target_addr) <FIELD_LOC_KIND_PHYSNAME>: Use
lookup_minimal_symbol. Add a comment.
* dwarf2read.c
(read_call_site_scope) <is_ref_attr> <die_is_declaration>: Prefer
DW_AT_linkage_name.
gdb/testsuite/
2013-03-02 Jan Kratochvil <jan.kratochvil@redhat.com>
Fix entry-values in C++ across CUs.
* gdb.arch/amd64-tailcall-cxx.exp: New file.
* gdb.arch/amd64-tailcall-cxx1.S: New file.
* gdb.arch/amd64-tailcall-cxx1.cc: New file.
* gdb.arch/amd64-tailcall-cxx2.S: New file.
* gdb.arch/amd64-tailcall-cxx2.cc: New file.
diff --git a/gdb/dwarf2loc.c b/gdb/dwarf2loc.c
index 8a61ae6..f300df2 100644
--- a/gdb/dwarf2loc.c
+++ b/gdb/dwarf2loc.c
@@ -542,7 +542,9 @@ call_site_to_target_addr (struct gdbarch *call_site_gdbarch,
struct minimal_symbol *msym;
physname = FIELD_STATIC_PHYSNAME (call_site->target);
- msym = lookup_minimal_symbol_text (physname, NULL);
+
+ /* Handle both the mangled and demangled PHYSNAME. */
+ msym = lookup_minimal_symbol (physname, NULL, NULL);
if (msym == NULL)
{
msym = lookup_minimal_symbol_by_pc (call_site->pc - 1);
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index df6298b..faee1a8 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -9812,9 +9812,18 @@ read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
gdb_assert (target_cu->objfile == objfile);
if (die_is_declaration (target_die, target_cu))
{
- const char *target_physname;
-
- target_physname = dwarf2_physname (NULL, target_die, target_cu);
+ const char *target_physname = NULL;
+ struct attribute *target_attr;
+
+ /* Prefer the mangled name; otherwise compute the demangled one. */
+ target_attr = dwarf2_attr (target_die, DW_AT_linkage_name, target_cu);
+ if (target_attr == NULL)
+ target_attr = dwarf2_attr (target_die, DW_AT_MIPS_linkage_name,
+ target_cu);
+ if (target_attr != NULL && DW_STRING (target_attr) != NULL)
+ target_physname = DW_STRING (target_attr);
+ else
+ target_physname = dwarf2_physname (NULL, target_die, target_cu);
if (target_physname == NULL)
complaint (&symfile_complaints,
_("DW_AT_GNU_call_site_target target DIE has invalid "
diff --git a/gdb/testsuite/gdb.arch/amd64-tailcall-cxx.exp b/gdb/testsuite/gdb.arch/amd64-tailcall-cxx.exp
new file mode 100644
index 0000000..db2ab3c
--- /dev/null
+++ b/gdb/testsuite/gdb.arch/amd64-tailcall-cxx.exp
@@ -0,0 +1,36 @@
+# Copyright (C) 2012-2013 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/>.
+
+set opts {}
+standard_testfile amd64-tailcall-cxx1.S amd64-tailcall-cxx2.S
+
+if [info exists COMPILE] {
+ # make check RUNTESTFLAGS="gdb.arch/amd64-tailcall-cxx.exp COMPILE=1"
+ standard_testfile amd64-tailcall-cxx1.cc amd64-tailcall-cxx2.cc
+ lappend opts debug optimize=-O2
+} elseif { ![istarget x86_64-*-* ] || ![is_lp64_target] } {
+ verbose "Skipping ${testfile}."
+ return
+}
+
+if { [prepare_for_testing ${testfile}.exp ${testfile} "${srcfile} ${srcfile2}" $opts] } {
+ return -1
+}
+
+if ![runto g] {
+ return -1
+}
+
+gdb_test "bt" "\r\n#0 +g \\(x=x@entry=2\\) at \[^\r\n\]*\r\n#1 +0x\[0-9a-f\]+ in f \\(x=x@entry=1\\) at \[^\r\n\]*\r\n#2 +0x\[0-9a-f\]+ in main .*"
diff --git a/gdb/testsuite/gdb.arch/amd64-tailcall-cxx1.S b/gdb/testsuite/gdb.arch/amd64-tailcall-cxx1.S
new file mode 100644
index 0000000..d988446
--- /dev/null
+++ b/gdb/testsuite/gdb.arch/amd64-tailcall-cxx1.S
@@ -0,0 +1,367 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright 2012-2013 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 source file was generated by:
+ g++ -o gdb.arch/amd64-tailcall-cxx1.S gdb.arch/amd64-tailcall-cxx1.cc -Wall -S -dA -O2 -g
+ Fedora GCC was used here to also test the case of missing DW_AT_linkage_name.
+ */
+
+ .file "amd64-tailcall-cxx1.cc"
+ .text
+.Ltext0:
+ .p2align 4,,15
+ .globl _Z1gi
+ .type _Z1gi, @function
+_Z1gi:
+.LFB0:
+ .file 1 "gdb.arch/amd64-tailcall-cxx1.cc"
+ # gdb.arch/amd64-tailcall-cxx1.cc:22
+ .loc 1 22 0
+ .cfi_startproc
+.LVL0:
+# BLOCK 2 freq:10000 seq:0
+# PRED: ENTRY [100.0%] (FALLTHRU)
+ # gdb.arch/amd64-tailcall-cxx1.cc:23
+ .loc 1 23 0
+ movl %edi, v(%rip)
+# SUCC: EXIT [100.0%]
+ ret
+ .cfi_endproc
+.LFE0:
+ .size _Z1gi, .-_Z1gi
+ .section .text.startup,"ax",@progbits
+ .p2align 4,,15
+ .globl main
+ .type main, @function
+main:
+.LFB1:
+ # gdb.arch/amd64-tailcall-cxx1.cc:30
+ .loc 1 30 0
+ .cfi_startproc
+# BLOCK 2 freq:10000 seq:0
+# PRED: ENTRY [100.0%] (FALLTHRU)
+ subq $8, %rsp
+ .cfi_def_cfa_offset 16
+ # gdb.arch/amd64-tailcall-cxx1.cc:31
+ .loc 1 31 0
+ movl $1, %edi
+ call _Z1fi
+.LVL1:
+ # gdb.arch/amd64-tailcall-cxx1.cc:32
+ .loc 1 32 0
+ xorl %eax, %eax
+ addq $8, %rsp
+ .cfi_def_cfa_offset 8
+# SUCC: EXIT [100.0%]
+ ret
+ .cfi_endproc
+.LFE1:
+ .size main, .-main
+ .globl v
+ .bss
+ .align 4
+ .type v, @object
+ .size v, 4
+v:
+ .zero 4
+ .text
+.Letext0:
+ .section .debug_info,"",@progbits
+.Ldebug_info0:
+ .long 0xb4 # Length of Compilation Unit Info
+ .value 0x4 # DWARF version number
+ .long .Ldebug_abbrev0 # Offset Into Abbrev. Section
+ .byte 0x8 # Pointer Size (in bytes)
+ .uleb128 0x1 # (DIE (0xb) DW_TAG_compile_unit)
+ .long .LASF1 # DW_AT_producer: "GNU C++ 4.8.0 20130220 (Red Hat 4.8.0-0.14) -mtune=generic -march=x86-64 -g -O2"
+ .byte 0x4 # DW_AT_language
+ .long .LASF2 # DW_AT_name: "gdb.arch/amd64-tailcall-cxx1.cc"
+ .long .LASF3 # DW_AT_comp_dir: ""
+ .long .Ldebug_ranges0+0 # DW_AT_ranges
+ .quad 0 # DW_AT_low_pc
+ .long .Ldebug_line0 # DW_AT_stmt_list
+ .uleb128 0x2 # (DIE (0x29) DW_TAG_subprogram)
+ # DW_AT_external
+ .ascii "g\0" # DW_AT_name
+ .byte 0x1 # DW_AT_decl_file (gdb.arch/amd64-tailcall-cxx1.cc)
+ .byte 0x15 # DW_AT_decl_line
+ .long .LASF4 # DW_AT_linkage_name: "_Z1gi"
+ .quad .LFB0 # DW_AT_low_pc
+ .quad .LFE0-.LFB0 # DW_AT_high_pc
+ .uleb128 0x1 # DW_AT_frame_base
+ .byte 0x9c # DW_OP_call_frame_cfa
+ # DW_AT_GNU_all_call_sites
+ .long 0x54 # DW_AT_sibling
+ .uleb128 0x3 # (DIE (0x48) DW_TAG_formal_parameter)
+ .ascii "x\0" # DW_AT_name
+ .byte 0x1 # DW_AT_decl_file (gdb.arch/amd64-tailcall-cxx1.cc)
+ .byte 0x15 # DW_AT_decl_line
+ .long 0x54 # DW_AT_type
+ .uleb128 0x1 # DW_AT_location
+ .byte 0x55 # DW_OP_reg5
+ .byte 0 # end of children of DIE 0x29
+ .uleb128 0x4 # (DIE (0x54) DW_TAG_base_type)
+ .byte 0x4 # DW_AT_byte_size
+ .byte 0x5 # DW_AT_encoding
+ .ascii "int\0" # DW_AT_name
+ .uleb128 0x5 # (DIE (0x5b) DW_TAG_subprogram)
+ # DW_AT_external
+ .long .LASF0 # DW_AT_name: "main"
+ .byte 0x1 # DW_AT_decl_file (gdb.arch/amd64-tailcall-cxx1.cc)
+ .byte 0x1d # DW_AT_decl_line
+ .long 0x54 # DW_AT_type
+ .quad .LFB1 # DW_AT_low_pc
+ .quad .LFE1-.LFB1 # DW_AT_high_pc
+ .uleb128 0x1 # DW_AT_frame_base
+ .byte 0x9c # DW_OP_call_frame_cfa
+ # DW_AT_GNU_all_call_sites
+ .long 0x90 # DW_AT_sibling
+ .uleb128 0x6 # (DIE (0x7c) DW_TAG_GNU_call_site)
+ .quad .LVL1 # DW_AT_low_pc
+ .long 0xa8 # DW_AT_abstract_origin
+ .uleb128 0x7 # (DIE (0x89) DW_TAG_GNU_call_site_parameter)
+ .uleb128 0x1 # DW_AT_location
+ .byte 0x55 # DW_OP_reg5
+ .uleb128 0x1 # DW_AT_GNU_call_site_value
+ .byte 0x31 # DW_OP_lit1
+ .byte 0 # end of children of DIE 0x7c
+ .byte 0 # end of children of DIE 0x5b
+ .uleb128 0x8 # (DIE (0x90) DW_TAG_variable)
+ .ascii "v\0" # DW_AT_name
+ .byte 0x1 # DW_AT_decl_file (gdb.arch/amd64-tailcall-cxx1.cc)
+ .byte 0x12 # DW_AT_decl_line
+ .long 0xa3 # DW_AT_type
+ # DW_AT_external
+ .uleb128 0x9 # DW_AT_location
+ .byte 0x3 # DW_OP_addr
+ .quad v
+ .uleb128 0x9 # (DIE (0xa3) DW_TAG_volatile_type)
+ .long 0x54 # DW_AT_type
+ .uleb128 0xa # (DIE (0xa8) DW_TAG_subprogram)
+ # DW_AT_external
+ .ascii "f\0" # DW_AT_name
+ .byte 0x1 # DW_AT_decl_file (gdb.arch/amd64-tailcall-cxx1.cc)
+ .byte 0x1a # DW_AT_decl_line
+ .long .LASF5 # DW_AT_linkage_name: "_Z1fi"
+ # DW_AT_declaration
+ .uleb128 0xb # (DIE (0xb1) DW_TAG_formal_parameter)
+ .long 0x54 # DW_AT_type
+ .byte 0 # end of children of DIE 0xa8
+ .byte 0 # end of children of DIE 0xb
+ .section .debug_abbrev,"",@progbits
+.Ldebug_abbrev0:
+ .uleb128 0x1 # (abbrev code)
+ .uleb128 0x11 # (TAG: DW_TAG_compile_unit)
+ .byte 0x1 # DW_children_yes
+ .uleb128 0x25 # (DW_AT_producer)
+ .uleb128 0xe # (DW_FORM_strp)
+ .uleb128 0x13 # (DW_AT_language)
+ .uleb128 0xb # (DW_FORM_data1)
+ .uleb128 0x3 # (DW_AT_name)
+ .uleb128 0xe # (DW_FORM_strp)
+ .uleb128 0x1b # (DW_AT_comp_dir)
+ .uleb128 0xe # (DW_FORM_strp)
+ .uleb128 0x55 # (DW_AT_ranges)
+ .uleb128 0x17 # (DW_FORM_sec_offset)
+ .uleb128 0x11 # (DW_AT_low_pc)
+ .uleb128 0x1 # (DW_FORM_addr)
+ .uleb128 0x10 # (DW_AT_stmt_list)
+ .uleb128 0x17 # (DW_FORM_sec_offset)
+ .byte 0
+ .byte 0
+ .uleb128 0x2 # (abbrev code)
+ .uleb128 0x2e # (TAG: DW_TAG_subprogram)
+ .byte 0x1 # DW_children_yes
+ .uleb128 0x3f # (DW_AT_external)
+ .uleb128 0x19 # (DW_FORM_flag_present)
+ .uleb128 0x3 # (DW_AT_name)
+ .uleb128 0x8 # (DW_FORM_string)
+ .uleb128 0x3a # (DW_AT_decl_file)
+ .uleb128 0xb # (DW_FORM_data1)
+ .uleb128 0x3b # (DW_AT_decl_line)
+ .uleb128 0xb # (DW_FORM_data1)
+ .uleb128 0x6e # (DW_AT_linkage_name)
+ .uleb128 0xe # (DW_FORM_strp)
+ .uleb128 0x11 # (DW_AT_low_pc)
+ .uleb128 0x1 # (DW_FORM_addr)
+ .uleb128 0x12 # (DW_AT_high_pc)
+ .uleb128 0x7 # (DW_FORM_data8)
+ .uleb128 0x40 # (DW_AT_frame_base)
+ .uleb128 0x18 # (DW_FORM_exprloc)
+ .uleb128 0x2117 # (DW_AT_GNU_all_call_sites)
+ .uleb128 0x19 # (DW_FORM_flag_present)
+ .uleb128 0x1 # (DW_AT_sibling)
+ .uleb128 0x13 # (DW_FORM_ref4)
+ .byte 0
+ .byte 0
+ .uleb128 0x3 # (abbrev code)
+ .uleb128 0x5 # (TAG: DW_TAG_formal_parameter)
+ .byte 0 # DW_children_no
+ .uleb128 0x3 # (DW_AT_name)
+ .uleb128 0x8 # (DW_FORM_string)
+ .uleb128 0x3a # (DW_AT_decl_file)
+ .uleb128 0xb # (DW_FORM_data1)
+ .uleb128 0x3b # (DW_AT_decl_line)
+ .uleb128 0xb # (DW_FORM_data1)
+ .uleb128 0x49 # (DW_AT_type)
+ .uleb128 0x13 # (DW_FORM_ref4)
+ .uleb128 0x2 # (DW_AT_location)
+ .uleb128 0x18 # (DW_FORM_exprloc)
+ .byte 0
+ .byte 0
+ .uleb128 0x4 # (abbrev code)
+ .uleb128 0x24 # (TAG: DW_TAG_base_type)
+ .byte 0 # DW_children_no
+ .uleb128 0xb # (DW_AT_byte_size)
+ .uleb128 0xb # (DW_FORM_data1)
+ .uleb128 0x3e # (DW_AT_encoding)
+ .uleb128 0xb # (DW_FORM_data1)
+ .uleb128 0x3 # (DW_AT_name)
+ .uleb128 0x8 # (DW_FORM_string)
+ .byte 0
+ .byte 0
+ .uleb128 0x5 # (abbrev code)
+ .uleb128 0x2e # (TAG: DW_TAG_subprogram)
+ .byte 0x1 # DW_children_yes
+ .uleb128 0x3f # (DW_AT_external)
+ .uleb128 0x19 # (DW_FORM_flag_present)
+ .uleb128 0x3 # (DW_AT_name)
+ .uleb128 0xe # (DW_FORM_strp)
+ .uleb128 0x3a # (DW_AT_decl_file)
+ .uleb128 0xb # (DW_FORM_data1)
+ .uleb128 0x3b # (DW_AT_decl_line)
+ .uleb128 0xb # (DW_FORM_data1)
+ .uleb128 0x49 # (DW_AT_type)
+ .uleb128 0x13 # (DW_FORM_ref4)
+ .uleb128 0x11 # (DW_AT_low_pc)
+ .uleb128 0x1 # (DW_FORM_addr)
+ .uleb128 0x12 # (DW_AT_high_pc)
+ .uleb128 0x7 # (DW_FORM_data8)
+ .uleb128 0x40 # (DW_AT_frame_base)
+ .uleb128 0x18 # (DW_FORM_exprloc)
+ .uleb128 0x2117 # (DW_AT_GNU_all_call_sites)
+ .uleb128 0x19 # (DW_FORM_flag_present)
+ .uleb128 0x1 # (DW_AT_sibling)
+ .uleb128 0x13 # (DW_FORM_ref4)
+ .byte 0
+ .byte 0
+ .uleb128 0x6 # (abbrev code)
+ .uleb128 0x4109 # (TAG: DW_TAG_GNU_call_site)
+ .byte 0x1 # DW_children_yes
+ .uleb128 0x11 # (DW_AT_low_pc)
+ .uleb128 0x1 # (DW_FORM_addr)
+ .uleb128 0x31 # (DW_AT_abstract_origin)
+ .uleb128 0x13 # (DW_FORM_ref4)
+ .byte 0
+ .byte 0
+ .uleb128 0x7 # (abbrev code)
+ .uleb128 0x410a # (TAG: DW_TAG_GNU_call_site_parameter)
+ .byte 0 # DW_children_no
+ .uleb128 0x2 # (DW_AT_location)
+ .uleb128 0x18 # (DW_FORM_exprloc)
+ .uleb128 0x2111 # (DW_AT_GNU_call_site_value)
+ .uleb128 0x18 # (DW_FORM_exprloc)
+ .byte 0
+ .byte 0
+ .uleb128 0x8 # (abbrev code)
+ .uleb128 0x34 # (TAG: DW_TAG_variable)
+ .byte 0 # DW_children_no
+ .uleb128 0x3 # (DW_AT_name)
+ .uleb128 0x8 # (DW_FORM_string)
+ .uleb128 0x3a # (DW_AT_decl_file)
+ .uleb128 0xb # (DW_FORM_data1)
+ .uleb128 0x3b # (DW_AT_decl_line)
+ .uleb128 0xb # (DW_FORM_data1)
+ .uleb128 0x49 # (DW_AT_type)
+ .uleb128 0x13 # (DW_FORM_ref4)
+ .uleb128 0x3f # (DW_AT_external)
+ .uleb128 0x19 # (DW_FORM_flag_present)
+ .uleb128 0x2 # (DW_AT_location)
+ .uleb128 0x18 # (DW_FORM_exprloc)
+ .byte 0
+ .byte 0
+ .uleb128 0x9 # (abbrev code)
+ .uleb128 0x35 # (TAG: DW_TAG_volatile_type)
+ .byte 0 # DW_children_no
+ .uleb128 0x49 # (DW_AT_type)
+ .uleb128 0x13 # (DW_FORM_ref4)
+ .byte 0
+ .byte 0
+ .uleb128 0xa # (abbrev code)
+ .uleb128 0x2e # (TAG: DW_TAG_subprogram)
+ .byte 0x1 # DW_children_yes
+ .uleb128 0x3f # (DW_AT_external)
+ .uleb128 0x19 # (DW_FORM_flag_present)
+ .uleb128 0x3 # (DW_AT_name)
+ .uleb128 0x8 # (DW_FORM_string)
+ .uleb128 0x3a # (DW_AT_decl_file)
+ .uleb128 0xb # (DW_FORM_data1)
+ .uleb128 0x3b # (DW_AT_decl_line)
+ .uleb128 0xb # (DW_FORM_data1)
+ .uleb128 0x6e # (DW_AT_linkage_name)
+ .uleb128 0xe # (DW_FORM_strp)
+ .uleb128 0x3c # (DW_AT_declaration)
+ .uleb128 0x19 # (DW_FORM_flag_present)
+ .byte 0
+ .byte 0
+ .uleb128 0xb # (abbrev code)
+ .uleb128 0x5 # (TAG: DW_TAG_formal_parameter)
+ .byte 0 # DW_children_no
+ .uleb128 0x49 # (DW_AT_type)
+ .uleb128 0x13 # (DW_FORM_ref4)
+ .byte 0
+ .byte 0
+ .byte 0
+ .section .debug_aranges,"",@progbits
+ .long 0x3c # Length of Address Ranges Info
+ .value 0x2 # DWARF Version
+ .long .Ldebug_info0 # Offset of Compilation Unit Info
+ .byte 0x8 # Size of Address
+ .byte 0 # Size of Segment Descriptor
+ .value 0 # Pad to 16 byte boundary
+ .value 0
+ .quad .Ltext0 # Address
+ .quad .Letext0-.Ltext0 # Length
+ .quad .LFB1 # Address
+ .quad .LFE1-.LFB1 # Length
+ .quad 0
+ .quad 0
+ .section .debug_ranges,"",@progbits
+.Ldebug_ranges0:
+ .quad .Ltext0 # Offset 0
+ .quad .Letext0
+ .quad .LFB1 # Offset 0x10
+ .quad .LFE1
+ .quad 0
+ .quad 0
+ .section .debug_line,"",@progbits
+.Ldebug_line0:
+ .section .debug_str,"MS",@progbits,1
+.LASF4:
+ .string "_Z1gi"
+.LASF3:
+ .string ""
+.LASF2:
+ .string "gdb.arch/amd64-tailcall-cxx1.cc"
+.LASF1:
+ .string "GNU C++ 4.8.0 20130220 (Red Hat 4.8.0-0.14) -mtune=generic -march=x86-64 -g -O2"
+.LASF0:
+ .string "main"
+.LASF5:
+ .string "_Z1fi"
+ .ident "GCC: (GNU) 4.8.0 20130220 (Red Hat 4.8.0-0.14)"
+ .section .note.GNU-stack,"",@progbits
diff --git a/gdb/testsuite/gdb.arch/amd64-tailcall-cxx1.cc b/gdb/testsuite/gdb.arch/amd64-tailcall-cxx1.cc
new file mode 100644
index 0000000..7af9936
--- /dev/null
+++ b/gdb/testsuite/gdb.arch/amd64-tailcall-cxx1.cc
@@ -0,0 +1,32 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright 2013 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/>. */
+
+volatile int v;
+
+__attribute__ ((noinline, noclone)) void
+g (int x)
+{
+ v = x;
+}
+
+extern void f (int x);
+
+int
+main ()
+{
+ f (1);
+}
diff --git a/gdb/testsuite/gdb.arch/amd64-tailcall-cxx2.S b/gdb/testsuite/gdb.arch/amd64-tailcall-cxx2.S
new file mode 100644
index 0000000..8a26d6f
--- /dev/null
+++ b/gdb/testsuite/gdb.arch/amd64-tailcall-cxx2.S
@@ -0,0 +1,276 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright 2012-2013 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 source file was generated by:
+ g++ -o gdb.arch/amd64-tailcall-cxx2.S gdb.arch/amd64-tailcall-cxx2.cc -Wall -S -dA -O2 -g
+ Fedora GCC was used here to also test the case of missing DW_AT_linkage_name.
+ */
+
+ .file "amd64-tailcall-cxx2.cc"
+ .text
+.Ltext0:
+ .p2align 4,,15
+ .globl _Z1fi
+ .type _Z1fi, @function
+_Z1fi:
+.LFB0:
+ .file 1 "gdb.arch/amd64-tailcall-cxx2.cc"
+ # gdb.arch/amd64-tailcall-cxx2.cc:22
+ .loc 1 22 0
+ .cfi_startproc
+.LVL0:
+# BLOCK 2 freq:10000 seq:0
+# PRED: ENTRY [100.0%] (FALLTHRU)
+ # gdb.arch/amd64-tailcall-cxx2.cc:23
+ .loc 1 23 0
+ addl $1, %edi
+.LVL1:
+ jmp _Z1gi
+.LVL2:
+# SUCC: EXIT [100.0%] (ABNORMAL,SIBCALL)
+ .cfi_endproc
+.LFE0:
+ .size _Z1fi, .-_Z1fi
+.Letext0:
+ .section .debug_info,"",@progbits
+.Ldebug_info0:
+ .long 0x84 # Length of Compilation Unit Info
+ .value 0x4 # DWARF version number
+ .long .Ldebug_abbrev0 # Offset Into Abbrev. Section
+ .byte 0x8 # Pointer Size (in bytes)
+ .uleb128 0x1 # (DIE (0xb) DW_TAG_compile_unit)
+ .long .LASF0 # DW_AT_producer: "GNU C++ 4.8.0 20130220 (Red Hat 4.8.0-0.14) -mtune=generic -march=x86-64 -g -O2"
+ .byte 0x4 # DW_AT_language
+ .long .LASF1 # DW_AT_name: "gdb.arch/amd64-tailcall-cxx2.cc"
+ .long .LASF2 # DW_AT_comp_dir: ""
+ .quad .Ltext0 # DW_AT_low_pc
+ .quad .Letext0-.Ltext0 # DW_AT_high_pc
+ .long .Ldebug_line0 # DW_AT_stmt_list
+ .uleb128 0x2 # (DIE (0x2d) DW_TAG_subprogram)
+ # DW_AT_external
+ .ascii "f\0" # DW_AT_name
+ .byte 0x1 # DW_AT_decl_file (gdb.arch/amd64-tailcall-cxx2.cc)
+ .byte 0x15 # DW_AT_decl_line
+ .long .LASF3 # DW_AT_linkage_name: "_Z1fi"
+ .quad .LFB0 # DW_AT_low_pc
+ .quad .LFE0-.LFB0 # DW_AT_high_pc
+ .uleb128 0x1 # DW_AT_frame_base
+ .byte 0x9c # DW_OP_call_frame_cfa
+ # DW_AT_GNU_all_call_sites
+ .long 0x71 # DW_AT_sibling
+ .uleb128 0x3 # (DIE (0x4c) DW_TAG_formal_parameter)
+ .ascii "x\0" # DW_AT_name
+ .byte 0x1 # DW_AT_decl_file (gdb.arch/amd64-tailcall-cxx2.cc)
+ .byte 0x15 # DW_AT_decl_line
+ .long 0x71 # DW_AT_type
+ .long .LLST0 # DW_AT_location
+ .uleb128 0x4 # (DIE (0x59) DW_TAG_GNU_call_site)
+ .quad .LVL2 # DW_AT_low_pc
+ # DW_AT_GNU_tail_call
+ .long 0x78 # DW_AT_abstract_origin
+ .uleb128 0x5 # (DIE (0x66) DW_TAG_GNU_call_site_parameter)
+ .uleb128 0x1 # DW_AT_location
+ .byte 0x55 # DW_OP_reg5
+ .uleb128 0x5 # DW_AT_GNU_call_site_value
+ .byte 0xf3 # DW_OP_GNU_entry_value
+ .uleb128 0x1
+ .byte 0x55 # DW_OP_reg5
+ .byte 0x23 # DW_OP_plus_uconst
+ .uleb128 0x1
+ .byte 0 # end of children of DIE 0x59
+ .byte 0 # end of children of DIE 0x2d
+ .uleb128 0x6 # (DIE (0x71) DW_TAG_base_type)
+ .byte 0x4 # DW_AT_byte_size
+ .byte 0x5 # DW_AT_encoding
+ .ascii "int\0" # DW_AT_name
+ .uleb128 0x7 # (DIE (0x78) DW_TAG_subprogram)
+ # DW_AT_external
+ .ascii "g\0" # DW_AT_name
+ .byte 0x1 # DW_AT_decl_file (gdb.arch/amd64-tailcall-cxx2.cc)
+ .byte 0x12 # DW_AT_decl_line
+ .long .LASF4 # DW_AT_linkage_name: "_Z1gi"
+ # DW_AT_declaration
+ .uleb128 0x8 # (DIE (0x81) DW_TAG_formal_parameter)
+ .long 0x71 # DW_AT_type
+ .byte 0 # end of children of DIE 0x78
+ .byte 0 # end of children of DIE 0xb
+ .section .debug_abbrev,"",@progbits
+.Ldebug_abbrev0:
+ .uleb128 0x1 # (abbrev code)
+ .uleb128 0x11 # (TAG: DW_TAG_compile_unit)
+ .byte 0x1 # DW_children_yes
+ .uleb128 0x25 # (DW_AT_producer)
+ .uleb128 0xe # (DW_FORM_strp)
+ .uleb128 0x13 # (DW_AT_language)
+ .uleb128 0xb # (DW_FORM_data1)
+ .uleb128 0x3 # (DW_AT_name)
+ .uleb128 0xe # (DW_FORM_strp)
+ .uleb128 0x1b # (DW_AT_comp_dir)
+ .uleb128 0xe # (DW_FORM_strp)
+ .uleb128 0x11 # (DW_AT_low_pc)
+ .uleb128 0x1 # (DW_FORM_addr)
+ .uleb128 0x12 # (DW_AT_high_pc)
+ .uleb128 0x7 # (DW_FORM_data8)
+ .uleb128 0x10 # (DW_AT_stmt_list)
+ .uleb128 0x17 # (DW_FORM_sec_offset)
+ .byte 0
+ .byte 0
+ .uleb128 0x2 # (abbrev code)
+ .uleb128 0x2e # (TAG: DW_TAG_subprogram)
+ .byte 0x1 # DW_children_yes
+ .uleb128 0x3f # (DW_AT_external)
+ .uleb128 0x19 # (DW_FORM_flag_present)
+ .uleb128 0x3 # (DW_AT_name)
+ .uleb128 0x8 # (DW_FORM_string)
+ .uleb128 0x3a # (DW_AT_decl_file)
+ .uleb128 0xb # (DW_FORM_data1)
+ .uleb128 0x3b # (DW_AT_decl_line)
+ .uleb128 0xb # (DW_FORM_data1)
+ .uleb128 0x6e # (DW_AT_linkage_name)
+ .uleb128 0xe # (DW_FORM_strp)
+ .uleb128 0x11 # (DW_AT_low_pc)
+ .uleb128 0x1 # (DW_FORM_addr)
+ .uleb128 0x12 # (DW_AT_high_pc)
+ .uleb128 0x7 # (DW_FORM_data8)
+ .uleb128 0x40 # (DW_AT_frame_base)
+ .uleb128 0x18 # (DW_FORM_exprloc)
+ .uleb128 0x2117 # (DW_AT_GNU_all_call_sites)
+ .uleb128 0x19 # (DW_FORM_flag_present)
+ .uleb128 0x1 # (DW_AT_sibling)
+ .uleb128 0x13 # (DW_FORM_ref4)
+ .byte 0
+ .byte 0
+ .uleb128 0x3 # (abbrev code)
+ .uleb128 0x5 # (TAG: DW_TAG_formal_parameter)
+ .byte 0 # DW_children_no
+ .uleb128 0x3 # (DW_AT_name)
+ .uleb128 0x8 # (DW_FORM_string)
+ .uleb128 0x3a # (DW_AT_decl_file)
+ .uleb128 0xb # (DW_FORM_data1)
+ .uleb128 0x3b # (DW_AT_decl_line)
+ .uleb128 0xb # (DW_FORM_data1)
+ .uleb128 0x49 # (DW_AT_type)
+ .uleb128 0x13 # (DW_FORM_ref4)
+ .uleb128 0x2 # (DW_AT_location)
+ .uleb128 0x17 # (DW_FORM_sec_offset)
+ .byte 0
+ .byte 0
+ .uleb128 0x4 # (abbrev code)
+ .uleb128 0x4109 # (TAG: DW_TAG_GNU_call_site)
+ .byte 0x1 # DW_children_yes
+ .uleb128 0x11 # (DW_AT_low_pc)
+ .uleb128 0x1 # (DW_FORM_addr)
+ .uleb128 0x2115 # (DW_AT_GNU_tail_call)
+ .uleb128 0x19 # (DW_FORM_flag_present)
+ .uleb128 0x31 # (DW_AT_abstract_origin)
+ .uleb128 0x13 # (DW_FORM_ref4)
+ .byte 0
+ .byte 0
+ .uleb128 0x5 # (abbrev code)
+ .uleb128 0x410a # (TAG: DW_TAG_GNU_call_site_parameter)
+ .byte 0 # DW_children_no
+ .uleb128 0x2 # (DW_AT_location)
+ .uleb128 0x18 # (DW_FORM_exprloc)
+ .uleb128 0x2111 # (DW_AT_GNU_call_site_value)
+ .uleb128 0x18 # (DW_FORM_exprloc)
+ .byte 0
+ .byte 0
+ .uleb128 0x6 # (abbrev code)
+ .uleb128 0x24 # (TAG: DW_TAG_base_type)
+ .byte 0 # DW_children_no
+ .uleb128 0xb # (DW_AT_byte_size)
+ .uleb128 0xb # (DW_FORM_data1)
+ .uleb128 0x3e # (DW_AT_encoding)
+ .uleb128 0xb # (DW_FORM_data1)
+ .uleb128 0x3 # (DW_AT_name)
+ .uleb128 0x8 # (DW_FORM_string)
+ .byte 0
+ .byte 0
+ .uleb128 0x7 # (abbrev code)
+ .uleb128 0x2e # (TAG: DW_TAG_subprogram)
+ .byte 0x1 # DW_children_yes
+ .uleb128 0x3f # (DW_AT_external)
+ .uleb128 0x19 # (DW_FORM_flag_present)
+ .uleb128 0x3 # (DW_AT_name)
+ .uleb128 0x8 # (DW_FORM_string)
+ .uleb128 0x3a # (DW_AT_decl_file)
+ .uleb128 0xb # (DW_FORM_data1)
+ .uleb128 0x3b # (DW_AT_decl_line)
+ .uleb128 0xb # (DW_FORM_data1)
+ .uleb128 0x6e # (DW_AT_linkage_name)
+ .uleb128 0xe # (DW_FORM_strp)
+ .uleb128 0x3c # (DW_AT_declaration)
+ .uleb128 0x19 # (DW_FORM_flag_present)
+ .byte 0
+ .byte 0
+ .uleb128 0x8 # (abbrev code)
+ .uleb128 0x5 # (TAG: DW_TAG_formal_parameter)
+ .byte 0 # DW_children_no
+ .uleb128 0x49 # (DW_AT_type)
+ .uleb128 0x13 # (DW_FORM_ref4)
+ .byte 0
+ .byte 0
+ .byte 0
+ .section .debug_loc,"",@progbits
+.Ldebug_loc0:
+.LLST0:
+ .quad .LVL0-.Ltext0 # Location list begin address (*.LLST0)
+ .quad .LVL1-.Ltext0 # Location list end address (*.LLST0)
+ .value 0x1 # Location expression size
+ .byte 0x55 # DW_OP_reg5
+ .quad .LVL1-.Ltext0 # Location list begin address (*.LLST0)
+ .quad .LVL2-1-.Ltext0 # Location list end address (*.LLST0)
+ .value 0x3 # Location expression size
+ .byte 0x75 # DW_OP_breg5
+ .sleb128 -1
+ .byte 0x9f # DW_OP_stack_value
+ .quad .LVL2-1-.Ltext0 # Location list begin address (*.LLST0)
+ .quad .LFE0-.Ltext0 # Location list end address (*.LLST0)
+ .value 0x4 # Location expression size
+ .byte 0xf3 # DW_OP_GNU_entry_value
+ .uleb128 0x1
+ .byte 0x55 # DW_OP_reg5
+ .byte 0x9f # DW_OP_stack_value
+ .quad 0 # Location list terminator begin (*.LLST0)
+ .quad 0 # Location list terminator end (*.LLST0)
+ .section .debug_aranges,"",@progbits
+ .long 0x2c # Length of Address Ranges Info
+ .value 0x2 # DWARF Version
+ .long .Ldebug_info0 # Offset of Compilation Unit Info
+ .byte 0x8 # Size of Address
+ .byte 0 # Size of Segment Descriptor
+ .value 0 # Pad to 16 byte boundary
+ .value 0
+ .quad .Ltext0 # Address
+ .quad .Letext0-.Ltext0 # Length
+ .quad 0
+ .quad 0
+ .section .debug_line,"",@progbits
+.Ldebug_line0:
+ .section .debug_str,"MS",@progbits,1
+.LASF0:
+ .string "GNU C++ 4.8.0 20130220 (Red Hat 4.8.0-0.14) -mtune=generic -march=x86-64 -g -O2"
+.LASF2:
+ .string ""
+.LASF3:
+ .string "_Z1fi"
+.LASF1:
+ .string "gdb.arch/amd64-tailcall-cxx2.cc"
+.LASF4:
+ .string "_Z1gi"
+ .ident "GCC: (GNU) 4.8.0 20130220 (Red Hat 4.8.0-0.14)"
+ .section .note.GNU-stack,"",@progbits
diff --git a/gdb/testsuite/gdb.arch/amd64-tailcall-cxx2.cc b/gdb/testsuite/gdb.arch/amd64-tailcall-cxx2.cc
new file mode 100644
index 0000000..232f4fb
--- /dev/null
+++ b/gdb/testsuite/gdb.arch/amd64-tailcall-cxx2.cc
@@ -0,0 +1,24 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright 2013 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/>. */
+
+extern void g (int x);
+
+__attribute__ ((noinline, noclone)) void
+f (int x)
+{
+ g (x + 1);
+}
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