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On powerpc64le-linux, I run into: ... (gdb) PASS: gdb.base/vla-optimized-out.exp: o1: printed optimized out vla p sizeof (a)^M $2 = <optimized out>^M (gdb) FAIL: gdb.base/vla-optimized-out.exp: o1: \ printed size of optimized out vla ... The problem happens as follows. In order to find the size of the optimized out vla, gdb needs to evaluate: ... <155> DW_AT_upper_bound : 13 byte block: f3 1 53 23 1 8 20 24 8 20 26 31 1c \ (DW_OP_GNU_entry_value: (DW_OP_reg3 (r3)); DW_OP_plus_uconst: 1; DW_OP_const1u: 32; DW_OP_shl; DW_OP_const1u: 32; DW_OP_shra; DW_OP_lit1; DW_OP_minus) ... When trying to evaluate DW_OP_GNU_entry_value, it looks for a call site matching the pc, but doesn't find it: ... $ gdb -q -batch outputs/gdb.base/vla-optimized-out/vla-optimized-out-o1 \ -ex "break f1" -ex run -ex "set debug entry-values 1" -ex "print sizeof (a)" Breakpoint 1 at 0x1000067c: file vla-optimized-out.c, line 34. Breakpoint 1, f1 (i=5) at vla-optimized-out.c:34 34 } DW_OP_entry_value resolving cannot find DW_TAG_call_site 0x100006b0 in main $1 = <optimized out> .... The call site lookup fails because the call site label .LVL4: ... bl f1 # 11 *call_value_nonlocal_aixdi [length = 8] nop .LVL4: ... is not placed directly after the bl insn. This is gcc PR target/107909. However, after manually fixing the .s file we have instead: ... Cannot find matching parameter at DW_TAG_call_site 0x10000690 at main $1 = <optimized out> ... due to the fact that the call site has no call site parameters. The call site does have a reference to the corresponding function f1, with parameter i, for which we find location list entries: ... 0037 1000067c 10000680 (DW_OP_reg3 (r3)) 004a 10000680 10000690 (DW_OP_GNU_entry_value: (DW_OP_reg3 (r3)); DW_OP_stack_value) ... and we could use the fact that the current pc is in the 1000067c-10000680 range, and that that the range starts at the start of the function, to deduce that DW_OP_GNU_entry_value: (DW_OP_reg3 (r3)) == DW_OP_reg3 (r3). But that's a non-trivial enhancement, filed as enhancement PR symtab/29836. Fix this by allowing <optimized out> for target powerpc and the gcc compiler. Reviewed-By: Carl Love <cel@us.ibm.com> Tested-By: Carl Love <cel@us.ibm.com> PR testsuite/29813 Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29813 |
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bfd | ||
binutils | ||
config | ||
contrib | ||
cpu | ||
elfcpp | ||
etc | ||
gas | ||
gdb | ||
gdbserver | ||
gdbsupport | ||
gnulib | ||
gold | ||
gprof | ||
gprofng | ||
include | ||
intl | ||
ld | ||
libbacktrace | ||
libctf | ||
libdecnumber | ||
libiberty | ||
libsframe | ||
opcodes | ||
readline | ||
sim | ||
texinfo | ||
zlib | ||
.cvsignore | ||
.editorconfig | ||
.gitattributes | ||
.gitignore | ||
ar-lib | ||
ChangeLog | ||
compile | ||
config-ml.in | ||
config.guess | ||
config.rpath | ||
config.sub | ||
configure | ||
configure.ac | ||
COPYING | ||
COPYING3 | ||
COPYING3.LIB | ||
COPYING.LIB | ||
COPYING.LIBGLOSS | ||
COPYING.NEWLIB | ||
depcomp | ||
djunpack.bat | ||
install-sh | ||
libtool.m4 | ||
lt~obsolete.m4 | ||
ltgcc.m4 | ||
ltmain.sh | ||
ltoptions.m4 | ||
ltsugar.m4 | ||
ltversion.m4 | ||
MAINTAINERS | ||
Makefile.def | ||
Makefile.in | ||
Makefile.tpl | ||
makefile.vms | ||
missing | ||
mkdep | ||
mkinstalldirs | ||
move-if-change | ||
multilib.am | ||
README | ||
README-maintainer-mode | ||
setup.com | ||
src-release.sh | ||
symlink-tree | ||
test-driver | ||
ylwrap |
README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.