binutils-gdb/gdb/testsuite/gdb.base/solib-vanish-lib1.c

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Fix gdb segv when objfile can't be opened This fixes PR 16577. This patch changes gdb_bfd_map_section to issue a warning rather than an error if it is unable to read the object file, and sets the size of the section/frame that it attempted to read to 0 on error. The description of gdb_bfd_map_section states that it will try to read or map the contents of the section SECT, and if successful, the section data is returned and *SIZE is set to the size of the section data. This function was throwing an error and leaving *SIZE as-is. Setting the section size to 0 indicates to dwarf2_build_frame_info that there is no data to read, otherwise it will try to read from an invalid frame pointer. Changing the error to a warning allows this to be handled gracefully. Additionally, the error was clobbering the breakpoint output indicating the current frame (function name, arguments, source file, and line number). E.g. Thread 3 "foo" hit Breakpoint 1, BFD: reopening /tmp/jna-1013829440/jna2973250704389291330.tmp: No such file or directory BFD: reopening /tmp/jna-1013829440/jna2973250704389291330.tmp: No such file or directory (gdb) While the "BFD: reopening ..." messages will still appear interspersed in the breakpoint output, the current frame info is now displayed: Thread 3 "foo" hit Breakpoint 1, BFD: reopening /tmp/jna-1013829440/jna1875755897659885075.tmp: No such file or directory BFD: reopening /tmp/jna-1013829440/jna1875755897659885075.tmp: No such file or directory warning: Can't read data for section '.eh_frame' in file '/tmp/jna-1013829440/jna1875755897659885075.tmp' do_something () at file.cpp:80 80 { (gdb)
2017-10-30 23:13:44 +01:00
/* This testcase is part of GDB, the GNU debugger.
Copyright 2017-2018 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 int bar (int);
int
foo (int x)
{
return bar (x);
}