http://sourceware.org/ml/archer/2010-q3/msg00028.html Subject: [delayed-symfile] [commit] Fix a regression on CFI without DIE [Re: On Wed, 25 Feb 2009 00:14:29 +0100, Jan Kratochvil wrote: > commit 6a37c2b9962258ecf9299cc34a650e64a06acaa5 > > There was a regression on gdb.base/savedregs.exp. > > quick_addrmap/require_partial_symbols should be used even for the unwind debug > info checking as its load has been also delayed by this branch. [...] > --- a/gdb/dwarf2-frame.c > +++ b/gdb/dwarf2-frame.c [...] > @@ -1499,6 +1500,14 @@ dwarf2_frame_find_fde (CORE_ADDR *pc) > struct dwarf2_fde *fde; > CORE_ADDR offset; > > + if (objfile->quick_addrmap) > + { > + if (!addrmap_find (objfile->quick_addrmap, *pc)) > + continue; > + } > + /* FIXME: Read-in only .debug_frame/.eh_frame without .debug_info? */ > + require_partial_symbols (objfile); > + but this has caused a different regression (as discussed in the confcall). QUICK_ADDRMAP is built only from .debug_aranges. But we can have existing built .debug_aranges for CUs in OBJFILE but still some CUs do not need to have DWARF at all while they can feature CFIs (.eh_frame or .debug_frame). It has been described by Daniel Jacobowitz at: Re: [2/4] RFC: check psymtabs_addrmap before reading FDEs http://sourceware.org/ml/gdb-patches/2010-07/msg00012.html Sorry for this regression by me (in that fix of a different regression). Fixed it the "slow way" as this branch is now obsoleted by .gdb-index. No regressions on {x86_64,x86_64-m32,i686}-fedora13-linux-gnu. Checked-in. Thanks, Jan eb8df8566acc1ed963e3e9b77c13b9c2c3db03fb Test CFI is parsed even for range (function) not described by any DIE. https://bugzilla.redhat.com/show_bug.cgi?id=614028 gdb/ * dwarf2-frame.c (dwarf2_frame_find_fde): Remove the OBJFILE->QUICK_ADDRMAP check. New comment why. gdb/testsuite/ * gdb.base/cfi-without-die.exp, gdb.base/cfi-without-die-main.c, gdb.base/cfi-without-die-caller.c: New files. --- gdb/dwarf2-frame.c | 8 +-- gdb/testsuite/gdb.base/cfi-without-die-caller.c | 28 ++++++++++ gdb/testsuite/gdb.base/cfi-without-die-main.c | 32 +++++++++++ gdb/testsuite/gdb.base/cfi-without-die.exp | 67 +++++++++++++++++++++++ 4 files changed, 130 insertions(+), 5 deletions(-) create mode 100644 gdb/testsuite/gdb.base/cfi-without-die-caller.c create mode 100644 gdb/testsuite/gdb.base/cfi-without-die-main.c create mode 100644 gdb/testsuite/gdb.base/cfi-without-die.exp Index: gdb-7.7/gdb/testsuite/gdb.base/cfi-without-die-caller.c =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ gdb-7.7/gdb/testsuite/gdb.base/cfi-without-die-caller.c 2014-02-06 19:35:23.485863819 +0100 @@ -0,0 +1,28 @@ +/* This testcase is part of GDB, the GNU debugger. + + Copyright 2005, 2007, 2008, 2009, 2010 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 . */ + +typedef int (*callback_t) (void); + +int +caller (callback_t callback) +{ + /* Ensure some frame content to push away the return address. */ + volatile const long one = 1; + + /* Modify the return value to prevent any tail-call optimization. */ + return (*callback) () - one; +} Index: gdb-7.7/gdb/testsuite/gdb.base/cfi-without-die-main.c =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ gdb-7.7/gdb/testsuite/gdb.base/cfi-without-die-main.c 2014-02-06 19:35:23.485863819 +0100 @@ -0,0 +1,32 @@ +/* This testcase is part of GDB, the GNU debugger. + + Copyright 2005, 2007, 2008, 2009, 2010 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 . */ + +typedef int (*callback_t) (void); + +extern int caller (callback_t callback); + +int +callback (void) +{ + return 1; +} + +int +main (void) +{ + return caller (callback); +} Index: gdb-7.7/gdb/testsuite/gdb.base/cfi-without-die.exp =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ gdb-7.7/gdb/testsuite/gdb.base/cfi-without-die.exp 2014-02-06 20:26:00.775208847 +0100 @@ -0,0 +1,67 @@ +# Copyright 2010 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 . + +# Test CFI is parsed even for range (function) not described by any DIE. + +set testfile cfi-without-die +set srcmainfile ${testfile}-main.c +set srccallerfile ${testfile}-caller.c +set executable ${testfile} +set objmainfile [standard_output_file ${testfile}-main.o] +set objcallerfile [standard_output_file ${testfile}-caller.o] +set binfile [standard_output_file ${executable}] + +if { [gdb_compile "${srcdir}/${subdir}/${srccallerfile}" ${objcallerfile} \ + object [list {additional_flags=-fomit-frame-pointer -fno-unwind-tables -fno-asynchronous-unwind-tables}]] != "" + || [gdb_compile "${srcdir}/${subdir}/${srcmainfile}" ${objmainfile} object {debug}] != "" + || [gdb_compile "${objmainfile} ${objcallerfile}" ${binfile} executable {}] != "" } { + untested ${testfile}.exp + return -1 +} + +clean_restart $executable + +if ![runto callback] then { + fail "verify unwinding: Can't run to callback" + return 0 +} +set test "verify unwinding breaks without CFI" +gdb_test_multiple "bt" $test { + -re " in main .*\r\n$gdb_prompt $" { + fail $test + } + -re "\r\n$gdb_prompt $" { + pass $test + } +} + +if { [gdb_compile "${srcdir}/${subdir}/${srccallerfile}" ${objcallerfile} \ + object [list {additional_flags=-fomit-frame-pointer -funwind-tables -fasynchronous-unwind-tables}]] != "" + || [gdb_compile "${srcdir}/${subdir}/${srcmainfile}" ${objmainfile} object {debug}] != "" + || [gdb_compile "${objmainfile} ${objcallerfile}" ${binfile} executable {}] != "" } { + untested ${testfile}.exp + return -1 +} + +clean_restart $executable + +if ![runto callback] then { + fail "test CFI without DIEs: Can't run to callback" + return 0 +} +# #0 callback () at ... +# #1 0x00000000004004e9 in caller () +# #2 0x00000000004004cd in main () at ... +gdb_test "bt" "#0 +callback \[^\r\n\]+\r\n#1 \[^\r\n\]+ in caller \[^\r\n\]+\r\n#2 \[^\r\n\]+ in main \[^\r\n\]+" "verify unwindin works for CFI without DIEs"