Consider this snippet from gcc/testsuite/gcc.dg/guality/vla-1.c:
...
int __attribute__((noinline))
f1 (int i)
{
char a[i + 1];
a[0] = 5; /* { dg-final { gdb-test .+1 "i" "5" } } */
return a[0]; /* { dg-final { gdb-test . "sizeof (a)" "6" } } */
}
...
When we compile the test-case with -O1 -g, and query the size of optimized
out vla 'a', we get:
...
$ ./gdb -batch -ex "b f1" -ex "r" -ex "p sizeof (a)" vla-1.exe
Breakpoint 1 at 0x4004a8: file vla-1.c, line 17.
Breakpoint 1, f1 (i=i@entry=5) at vla-1.c:17
17 return a[0];
$1 = 0
...
while we expect a size of '6'.
The problem is that default_read_var_value does not resolve the dynamic type
of a variable if the variable is optimized out.
This patch fixes that, and consequently gdb prints '6', as expected.
Tested on x86_64-linux.
2018-07-18 Tom de Vries <tdevries@suse.de>
* findvar.c (default_read_var_value): Also resolve dynamic type for
LOC_OPTIMIZED_OUT vars.
* gdb.base/vla-optimized-out.c: New test.
* gdb.base/vla-optimized-out.exp: New file.
Fix a bug with commit 4cc0665f24 ("microMIPS support"),
<https://sourceware.org/ml/gdb-patches/2012-05/msg00724.html>, and add
missing microMIPS SYSCALL instruction decoding needed to determine the
location to put a breakpoint at when single-stepping though a syscall.
gdb/
* mips-tdep.c (micromips_next_pc): Add SYSCALL instruction
decoding.
Fix an issue with commit 8602d4fea6 ("Add AIX weak support"),
<https://sourceware.org/ml/binutils/2009-03/msg00189.html>, and use the
correct condition to set the storage class for weak defined symbols.
The context here is as follows:
else if ((h->root.type == bfd_link_hash_defined
|| h->root.type == bfd_link_hash_defweak)
&& h->smclas == XMC_XO)
{
BFD_ASSERT (bfd_is_abs_section (h->root.u.def.section));
isym.n_value = h->root.u.def.value;
isym.n_scnum = N_UNDEF;
if (h->root.type == bfd_link_hash_undefweak
&& C_WEAKEXT == C_AIX_WEAKEXT)
isym.n_sclass = C_WEAKEXT;
else
isym.n_sclass = C_EXT;
aux.x_csect.x_smtyp = XTY_ER;
}
so clearly the inner condition can never be true. Correct the condition
then to check for the `bfd_link_hash_defweak' symbol type instead here,
and in a similar place a little further down in the same function.
bfd/
* xcofflink.c (xcoff_write_global_symbol): Fix symbol type
checks for defined weak symbols.
After
commit 1b54b8d7e4
Author: Jan Beulich <jbeulich@novell.com>
Date: Mon Dec 18 09:36:14 2017 +0100
x86: fold RegXMM/RegYMM/RegZMM into RegSIMD
... qualified by their respective sizes, allowing to drop FirstXmm0 at
the same time.
folded RegXMM, RegYMM and RegZMM into RegSIMD, it's no longer impossible
to distinguish if Xmmword can represent a memory reference when operand
specification contains SIMD register. For example, template operands
specification like these
RegXMM|...|Xmmword|...
and
RegXMM|...
The Xmmword bitfield is always set by RegXMM which is represented by
"RegSIMD|Xmmword". This patch splits each of vcvtps2qq, vcvtps2uqq,
vcvttps2qq and vcvttps2uqq into 2 templates: one template only has
RegXMM source operand and the other only has mempry source operand.
gas/
PR gas/23418
* testsuite/gas/i386/xmmword.s: Add tests for vcvtps2qq,
vcvtps2uqq, vcvttps2qq and vcvttps2uqq.
* testsuite/gas/i386/xmmword.l: Updated.
opcodes/
PR gas/23418
* i386-opc.h (Byte): Update comments.
(Word): Likewise.
(Dword): Likewise.
(Fword): Likewise.
(Qword): Likewise.
(Tbyte): Likewise.
(Xmmword): Likewise.
(Ymmword): Likewise.
(Zmmword): Likewise.
* i386-opc.tbl: Split vcvtps2qq, vcvtps2uqq, vcvttps2qq and
vcvttps2uqq.
* i386-tbl.h: Regenerated.
Currently on S/390 the .got.plt always comes first which prevents the
GNU_RELRO segment from being extended across the non-plt GOT entries.
Just swapping both unfortunately is not that simple since our ABI
requires the _GLOBAL_OFFSET_TABLE_ symbol to point to the very
beginning of the entire GOT. Of the 3 magic GOT entries the first is
accessed via got pointer while second and third are being accessed via
DT_PLTGOT. In order to keep them together we make DT_PLTGOT to point
to the .got instead of .got.plt. However, this violates an assumption
in the dynamic linker prelink undo code about the GOTPLT entries
starting at DT_PLTGOT + 3. We got rid of this requirement with a
Glibc patch already in version 2.24:
https://sourceware.org/ml/libc-alpha/2016-06/msg01302.html
So the S/390 relro GOT layout will look like this with this patch:
+----------------------------------+
|got[0]: DYNAMIC | <--- _GLOBAL_OFFSET_TABLE_ == DT_PLTGOT .got
|got[1]: link_map parm |
|got[2]: &_dl_runtime_resolve |
+----------------------------------+
| | non-plt GOT entries
| |
| |
+----------------------------------+
| | <--- .gotplt, PLT GOT entries
| |
| |
| |
+----------------------------------+
The patch detects the current layout in size_dynamic_section in order
to deal also with linker scripts not generated by this ld version.
With partial relro enabled we pick a linker script where .got and
.got.plt are swapped which then triggers the rest of the logic.
ld/ChangeLog:
2018-07-18 Andreas Krebbel <krebbel@linux.ibm.com>
* emulparams/elf64_s390.sh: Define GENERATE_RELRO_SCRIPT and
SEPARATE_GOTPLT.
* testsuite/ld-s390/gotreloc_64-relro-1.dd: New test.
* testsuite/ld-s390/gotreloc_64-norelro-1.dd: Renamed from ...
* testsuite/ld-s390/gotreloc_64-1.dd: ... this.
* testsuite/ld-s390/s390.exp: Split the GOT testcase into two.
bfd/ChangeLog:
2018-07-18 Andreas Krebbel <krebbel@linux.ibm.com>
* elf-s390-common.c (s390_gotplt_after_got_p): New function.
(s390_got_pointer): New function.
(s390_got_offset): New function.
(s390_gotplt_offset): New function.
* elf64-s390.c (allocate_dynrelocs): Adjust comment.
(elf_s390_size_dynamic_sections): Move space for magic GOT entries
from .got.plt to .got if necessary and pick the right location for
_GLOBAL_OFFSET_TABLE_.
(elf_s390_relocate_section): Use the wrapper functions from
elf-s390-common.c to deal with both possible layouts (either .got
or .got.plt first).
(elf_s390_finish_dynamic_sections): Likewise.
(elf_s390_finish_dynamic_symbol): Make the location of the GOT
magic entries conditional.
With this patch dedicated linker scripts can be generated for partial
relro triggered by defining GENERATE_RELRO_SCRIPT in the target
specific scripts.
This is necessary for e.g. S/390 where usually the .got.plt comes
first and prevents the relro segment from being extended across the
non-plt GOT entries.
The patch started with the work from Marcin taken from the mwk user
branches. However, the patch needed substantial changes due to the
'separate code' feature which got committed in the meantime.
ld/ChangeLog:
2018-07-18 Andreas Krebbel <krebbel@linux.ibm.com>
Marcin Kościelnicki <koriakin@0x04.net>
* emultempl/elf32.em: Add code to pick dedicated linker scripts
for partial relro.
* genscripts.sh: Generate dedicated linker scripts for partial relro.
This changes gdbscm_scm_to_string to return a unique_xmalloc_ptr and
then fixes all the callers. This allows for the removal of some
cleanups.
gdb/ChangeLog
2018-07-17 Tom Tromey <tom@tromey.com>
* guile/scm-param.c (pascm_set_func, pascm_show_func)
(compute_enum_list, pascm_set_param_value_x)
(gdbscm_parameter_value): Update.
* guile/guile-internal.h (gdbscm_scm_to_string): Update.
(gdbscm_scm_to_host_string): Update.
* guile/scm-math.c (vlscm_convert_typed_value_from_scheme):
Update.
* guile/scm-cmd.c (cmdscm_add_completion): Update.
* guile/scm-pretty-print.c (ppscm_print_string_repr): Update.
* guile/scm-string.c (gdbscm_scm_to_string): Return
unique_xmalloc_ptr.
(gdbscm_scm_to_host_string): Likewise.
This changes gdbscm_safe_eval_string to return a unique_xmalloc_ptr.
This allows for the removal of some cleanups. It also fixes a
potential latent memory leak in gdbscm_set_backtrace.
gdb/ChangeLog
2018-07-17 Tom Tromey <tom@tromey.com>
* guile/guile.c (gdbscm_eval_from_control_command): Update.
* guile/guile-internal.h (gdbscm_safe_eval_string): Update.
* guile/scm-objfile.c (gdbscm_execute_objfile_script): Update.
* guile/scm-safe-call.c (gdbscm_safe_eval_string): Return
unique_xmalloc_ptr.
This changes gdbscm_exception_message_to_string to return a
unique_xmalloc_ptr, allowing for the removal of some cleanups.
unique_xmalloc_ptr was chosen because at the root of the call chains
is a function from Guile that returns a malloc'd string.
gdb/ChangeLog
2018-07-17 Tom Tromey <tom@tromey.com>
* guile/scm-param.c (pascm_signal_setshow_error): Update.
* guile/guile-internal.h (gdbscm_exception_message_to_string):
Update.
* guile/scm-cmd.c (cmdscm_function): Update.
* guile/scm-pretty-print.c
(ppscm_print_exception_unless_memory_error): Update.
* guile/scm-exception.c (gdbscm_exception_message_to_string):
Return unique_xmalloc_ptr.
This changes ppscm_make_pp_type_error_exception to use std::string,
removing a cleanup.
gdb/ChangeLog
2018-07-17 Tom Tromey <tom@tromey.com>
* guile/scm-pretty-print.c (ppscm_make_pp_type_error_exception):
Use string_printf.
Use `bfd_is_abs_symbol' to determine whether a symbol is absolute,
avoiding a problem with ordinary symbols defined in a linker script
outside an output section definition. Such symbols have its owning
section set to the absolute section up to the final link phase. A flag
has been added to the link hash to identify such symbols. Rather than
checking the flag by hand, use the macro that does it uniformly for all
users.
bfd/
* elf32-nds32.c (nds32_elf_relax_loadstore): Use
`bfd_is_abs_symbol' rather than `bfd_is_abs_section' in checking
whether the symbol is absolute.
(nds32_elf_relax_lo12): Likewise.
* elfnn-aarch64.c (elfNN_aarch64_final_link_relocate): Likewise.
(elfNN_aarch64_check_relocs): Likewise.
* xcofflink.c (xcoff_need_ldrel_p): Likewise.
(bfd_xcoff_import_symbol): Likewise.
(xcoff_write_global_symbol): Likewise.
It is usually possible to tell absolute and ordinary symbols apart in
BFD throughout the link, by checking whether the section that owns the
symbol is absolute or not.
That however does not work for ordinary symbols defined in a linker
script outside an output section statement. Initially such symbols are
entered into to the link hash as absolute symbols, owned by the absolute
section. A flag is set in the internal linker expression defining such
symbols to tell the linker to convert them to section-relative ones in
the final phase of the link. That flag is however not accessible to BFD
linker code, including BFD target code in particular.
Add a flag to the link hash then to copy the information held in the
linker expression. Define a macro, `bfd_is_abs_symbol', for BFD code to
use where determining whether a symbol is absolute or ordinary is
required before the final link phase.
This macro will correctly identify the special `__ehdr_start' symbol as
ordinary throughout link, for example, even though early on it will be
assigned to the absolute section. Of course this does not let BFD code
identify what the symbol's ultimate section will be before the final
link phase has converted this symbol (in `update_definedness').
include/
* bfdlink.h (bfd_link_hash_entry): Add `rel_from_abs' member.
bfd/
* linker.c (bfd_is_abs_symbol): New macro.
* bfd-in2.h: Regenerate.
ld/
* ldexp.c (exp_fold_tree_1) <etree_assign, etree_provide>
<etree_provided>: Copy expression's `rel_from_abs' flag to the
link hash.
gdb/
* riscv-tdep.c (riscv_has_feature): Delete comment that refers to
set_gdbarch_decr_pc_after_break. Call riscv_read_misa_reg always.
(riscv_gdbarch_init): Delete local has_compressed_isa. Delete now
unecessary braces after EF_RISCV_RVC test. Delete call to
set_gdbarch_decr_pc_after_break.
I think it doesn't really make sense to allow building gdb without the
CLI. Perhaps at one time this was a goal, but libgdb is long gone and
the CLI is intrinsic to gdb.
So, this patch removes the implementation of this configure option.
It is still recognized (this is autoconf's default), but does nothing.
This simplifies configure.ac and Makefile.in a bit.
Tested by rebuilding.
gdb/ChangeLog
2018-07-17 Tom Tromey <tom@tromey.com>
* configure.ac: Remove --disable-gdbcli.
* configure: Rebuild.
* Makefile.in (SUBDIR_CLI_DEPS, SUBDIR_CLI_LDFLAGS)
(SUBDIR_CLI_CFLAGS): Remove.
(SFILES): Use SUBDIR_CLI_SRCS.
(COMMON_OBS): Use SUBDIR_CLI_OBS.
PR gdb/18624 concerns an assertion failure that occurs when setting a
breakpoint in a Go program on Windows.
What happens here is that coff_symtab_read uses buildsym but does not
instantiate scoped_free_pendings. So, the struct pending objects are
never released. Later, dwarf2read.c calls buildsym_init, which
asserts.
This patch fixes the problem by instantiating scoped_free_pendings in
coff_symtab_read.
Tested using the test executable from the PR. I don't know how to
test this more fully.
gdb/ChangeLog
2018-07-17 Tom Tromey <tom@tromey.com>
PR gdb/18624:
* coffread.c (coff_symtab_read): Use scoped_free_pendings.
I found this when doing a --enable-targets=all build with libunwind-ia64
properly configured.
CXX ia64-vms-tdep.o
/home/emaisin/src/binutils-gdb/gdb/ia64-vms-tdep.c: In function ‘int ia64_vms_find_proc_info_x(unw_addr_space_t, unw_word_t, unw_proc_info_t*, int, void*)’:
/home/emaisin/src/binutils-gdb/gdb/ia64-vms-tdep.c:79:33: error: invalid conversion from ‘void*’ to ‘gdb_byte* {aka unsigned char*}’ [-fpermissive]
pi->unwind_info, pi->unwind_info_size);
^
In file included from /home/emaisin/src/binutils-gdb/gdb/target.h:70:0,
from /home/emaisin/src/binutils-gdb/gdb/exec.h:23,
from /home/emaisin/src/binutils-gdb/gdb/gdbcore.h:29,
from /home/emaisin/src/binutils-gdb/gdb/ia64-vms-tdep.c:25:
/home/emaisin/src/binutils-gdb/gdb/target/target.h:35:12: note: initializing argument 2 of ‘int target_read_memory(CORE_ADDR, gdb_byte*, ssize_t)’
extern int target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr,
^
gdb/ChangeLog:
* ia64-vms-tdep.c (ia64_vms_find_proc_info_x): Add cast.
Commit
9018be22e0 ("Make target_read_alloc & al return vectors")
failed to update the code in ia64-tdep.c, for HAVE_LIBUNWIND_IA64_H.
This patch fixes that.
gdb/ChangeLog:
* ia64-tdep.c (ktab_buf): New global.
(getunwind_table): Return a gdb::optional<gdb::byte_vector>.
(get_kernel_table): Adjust.
This changes a few explicit checks of context_stack_depth to use
outermost_context_p instead. This simplifies some future work.
gdb/ChangeLog
2018-07-16 Tom Tromey <tom@tromey.com>
* xcoffread.c (read_xcoff_symtab): Use outermost_context_p.
* dwarf2read.c (using_directives, new_symbol): Use
outermost_context_p.
* dbxread.c (process_one_symbol): Use outermost_context_p.
* coffread.c (coff_symtab_read): Use outermost_context_p.
free_pending_blocks can be static because scoped_free_pendings (et al)
arrange for it to be NULL in the "steady state". This removes a
couple of unnecessary calls to free_pending_blocks and changes it to
be static.
gdb/ChangeLog
2018-07-16 Tom Tromey <tom@tromey.com>
* xcoffread.c (xcoff_initial_scan): Don't call
free_pending_blocks.
* dbxread.c (dbx_symfile_read): Don't call free_pending_blocks.
* buildsym.h (class scoped_free_pendings): Add constructor.
(free_pending_blocks): Don't declare.
* buildsym.c (scoped_free_pendings::scoped_free_pendings): New.
(free_pending_blocks): Now static.
This moves the global subfile_stack to be a member of
buildsym_compunit. It also change this to be a std::vector, which
simplifies the code.
gdb/ChangeLog
2018-07-16 Tom Tromey <tom@tromey.com>
* buildsym.h (push_subfile, pop_subfile): Update declarations.
* buildsym.c (struct buildsym_compunit) <m_subfile_stack>: New
member.
(struct subfile_stack): Remove.
(subfile_stack): Remove.
(push_subfile, pop_subfile, buildsym_init): Update.
This changes buildsym.c to use gdb_assert rather than internal_error
in a couple of spots.
gdb/ChangeLog
2018-07-16 Tom Tromey <tom@tromey.com>
* buildsym.c (push_subfile): Use gdb_assert.
(pop_subfile): Use gdb_assert.
I discovered that merge_symbol_lists is unused, so this removes it.
gdb/ChangeLog
2018-07-16 Tom Tromey <tom@tromey.com>
* buildsym.h (merge_symbol_lists): Remove.
* buildsym.c (merge_symbol_lists): Remove.
scan_file_globals is defined in stabsread.c, so move its declaration
to stabsread.h.
gdb/ChangeLog
2018-07-16 Tom Tromey <tom@tromey.com>
* stabsread.c (scan_file_globals): Update comment.
* stabsread.h (scan_file_globals): Move from buildsym.h.
* buildsym.h (scan_file_globals): Move to stabsread.h.
buildsym_new_init is just an alias for buildsym_init. This removes
it. In the long run buildsym_init will also go away; this patch just
helps make things a bit clearer in the meantime.
gdb/ChangeLog
2018-07-16 Tom Tromey <tom@tromey.com>
* xcoffread.c (xcoff_new_init): Update.
* mipsread.c (mipscoff_new_init): Update.
* mdebugread.c (mdebug_build_psymtabs): Update.
* elfread.c (elf_new_init): Update.
* dbxread.c (dbx_new_init, coffstab_build_psymtabs)
(elfstab_build_psymtabs, stabsect_build_psymtabs): Update.
* buildsym.h (buildsym_new_init): Don't declare.
* buildsym.c (buildsym_new_init): Remove.
The global within_function is only used by a few symbol readers. This
patch moves the global out of buildsym and into stabsread, which
seemed like a better fit. It also arranges for the existing readers
to clear the global at the appropriate time.
gdb/ChangeLog
2018-07-16 Tom Tromey <tom@tromey.com>
* stabsread.h (within_function): Move from buildsym.h.
* stabsread.c (start_stabs): Clear within_function.
* coffread.c (coff_start_symtab): Clear within_function.
* buildsym.h (within_function): Move to stabsread.h.
* buildsym.c (prepare_for_building): Update.
processing_gcc is also only used by stabsread -- it is set by the
DWARF reader, but this turns out not to be needed. So, this patch
moves processing_gcc and removes the assignment from the DWARF reader.
gdb/ChangeLog
2018-07-16 Tom Tromey <tom@tromey.com>
* stabsread.h (processing_gcc_compilation): Move from buildsym.h.
* dwarf2read.c (dwarf2_start_symtab): Don't set
processing_gcc_compilation.
* buildsym.h (processing_gcc_compilation): Move to stabsread.h.
A few things that currently reside in buildsym.c turn out to be
specific to the stabs reader. This patch moves these from
buildsym.[ch] to stabsread.[ch].
gdb/ChangeLog
2018-07-16 Tom Tromey <tom@tromey.com>
* stabsread.h (HASHSIZE, hashname, symnum, next_symbol_text)
(next_symbol_text_func): Move from buildsym.h.
* stabsread.c (hashname): Move from buildsym.c.
* buildsym.h (HASHSIZE, symnum, next_symbol_text)
(next_symbol_text_func, hashname): Move to stabsread.h.
* buildsym.c: Don't include bcache.h
(hashname): Move to stasbread.c.
context_stack_size is declared in buildsym.h, but only used in
buildsym.c. This makes it static in buildsym.c.
gdb/ChangeLog
2018-07-16 Tom Tromey <tom@tromey.com>
* buildsym.h (context_stack_size): Don't declare.
* buildsym.c (context_stack_size): New global.
processing_acc_compilation is only used in dbxread.c, so move it
there.
gdb/ChangeLog
2018-07-16 Tom Tromey <tom@tromey.com>
* dbxread.c (processing_acc_compilation): New global.
* buildsym.h (processing_acc_compilation): Don't declare.
This moves the global have_line_numbers into buildsym_compunit.
gdb/ChangeLog
2018-07-16 Tom Tromey <tom@tromey.com>
* buildsym.c (struct buildsym_compunit) <m_have_line_numbers>: New
member.
(have_line_numbers): Remove.
(record_line, prepare_for_building, end_symtab_get_static_block)
(augment_type_symtab): Update.
This moves the pending_macros global into buildsym_compunit.
gdb/ChangeLog
2018-07-16 Tom Tromey <tom@tromey.com>
* buildsym.c (~buildsym_compunit): Free the macro table.
(struct buildsym_compunit) <get_macro_table, release_macros>: New
methods.
<m_pending_macros>: New member.
(pending_macros): Remove.
(~scoped_free_pendings, get_macro_table, prepare_for_building)
(reset_symtab_globals, end_symtab_get_static_block)
(end_symtab_with_blockvector, augment_type_symtab)
(buildsym_init): Update.
This moves the global last_source_file into buildsym_compunit.
gdb/ChangeLog
2018-07-16 Tom Tromey <tom@tromey.com>
* buildsym.c (buildsym_compunit::buildsym_compunit): Add name
parameter.
(buildsym_compunit::set_last_source_file): New method.
<m_last_source_file>: New member.
(prepare_for_building): Remove "name" parameter.
(start_symtab, restart_symtab, reset_symtab_globals): Update.
(last_source_file): Remove.
(set_last_source_file, get_last_source_file): Update.
This adds an assertion in prepare_for_building. This was useful for
verifying whether some subsequent changes were valid.
gdb/ChangeLog
2018-07-16 Tom Tromey <tom@tromey.com>
* buildsym.c (prepare_for_building): Add assert.
This change buildsym_compunit::comp_dir to be a unique_xmalloc_ptr.
This is just a small cleanup to remove some manual memory management.
gdb/ChangeLog
2018-07-16 Tom Tromey <tom@tromey.com>
* buildsym.c (~buildsym_compunit): Update.
(struct buildsym_compunit) <comp_unit>: Now a unique_xmalloc_ptr.
(start_subfile, patch_subfile_names)
(end_symtab_with_blockvector): Update.
This changes buildsym_compunit to use new and delete.
gdb/ChangeLog
2018-07-16 Tom Tromey <tom@tromey.com>
* buildsym.c (struct buildsym_compunit): Add constructor,
destructor, initializers.
(start_buildsym_compunit): Remove.
(free_buildsym_compunit): Use "delete".
(start_symtab, restart_symtab): Use "new".
