Symbol lookup in linker will always fail on targets with leading char
in symbol name since __start_SECNAME and __stop_SECNAME in C may be
___start_SECNAME and ___stop_SECNAME in assembly. Also tests with
--gc-sections always fails on targets without --gc-sections support.
* testsuite/ld-elf/pr21562a.d: Skip on targets with leading char
in in symbol name or without --gc-sections.
* testsuite/ld-elf/pr21562b.d: Likewise.
* testsuite/ld-elf/pr21562c.d: Likewise.
* testsuite/ld-elf/pr21562d.d: Likewise.
* testsuite/ld-elf/pr21562i.d: Likewise.
* testsuite/ld-elf/pr21562j.d: Likewise.
* testsuite/ld-elf/pr21562k.d: Likewise.
* testsuite/ld-elf/pr21562l.d: Likewise.
* testsuite/ld-elf/pr21562m.d: Likewise.
* testsuite/ld-elf/pr21562n.d: Likewise.
* testsuite/ld-elf/pr21562e.d: Skip on targets with leading char
in symbol name.
* testsuite/ld-elf/pr21562f.d: Likewise.
* testsuite/ld-elf/pr21562g.d: Likewise.
* testsuite/ld-elf/pr21562h.d: Likewise.
Symbol lookup in linker will always fail on targets with leading char
in symbol name since __start_SECNAME and __stop_SECNAME in C may be
___start_SECNAME and ___stop_SECNAME in assembly.
* testsuite/ld-elf/sizeofa.d: Skip on targets with leading char
in symbol name.
* testsuite/ld-elf/sizeofb.d: Likewise.
* testsuite/ld-elf/startofa.d: Likewise.
* testsuite/ld-elf/startofb.d: Likewise.
PR binutils/21587
* rx-decode.opc: Include libiberty.h
(GET_SCALE): New macro - validates access to SCALE array.
(GET_PSCALE): New macro - validates access to PSCALE array.
(DIs, SIs, S2Is, rx_disp): Use new macros.
* rx-decode.c: Regenerate.
The new test var-access.exp causes FAILs on i686. This is because the
test chooses the wrong name for DWARF register number 1: It uses
"edx" (which corresponds to DWARF register number 2), but should have used
"ecx" instead.
Also, the current logic in var-access.exp does not correctly distinguish
between a 64-bit and a 32-bit program on an x86-64 target. It uses the
64-bit register names for both.
These problems are fixed. In order to address the latter, the convenience
macros is_*_target are exploited where appropriate.
gdb/testsuite/ChangeLog:
* gdb.dwarf2/var-access.exp: Use register name ecx instead of edx
on 32-bit x86 targets. Exploit is_*_target macros where
appropriate.
PR binutils/21589
* vms-alpha.c (_bfd_vms_get_value): Add an extra parameter - the
maximum value for the ascic pointer. Check that name processing
does not read beyond this value.
(_bfd_vms_slurp_etir): Add checks for attempts to read beyond the
end of etir record.
In some cases we've been replacing heap-allocated gdb_byte buffers
managed with xmalloc/make_cleanup(xfree) with gdb::vector<gdb_byte>.
That usually pessimizes the code a little bit because std::vector
value-initializes elements (which for gdb_byte means
zero-initialization), while if you're creating a temporary buffer,
you're most certaintly going to fill it in with some data. An
alternative is to use
unique_ptr<gdb_byte[]> buf (new gdb_byte[size]);
but it looks like that's not very popular.
Recently, a use of obstacks in dwarf2read.c was replaced with
std::vector<gdb_byte> and that as well introduced a pessimization for
always memsetting the buffer when it's garanteed that the zeros will
be overwritten immediately. (see dwarf2read.c change in this patch to
find it.)
So here's a different take at addressing this issue "by design":
#1 - Introduce default_init_allocator<T>
I.e., a custom allocator that does default construction using default
initialization, meaning, no more zero initialization. That's the
default_init_allocation<T> class added in this patch.
See "Notes" at
<http://en.cppreference.com/w/cpp/container/vector/resize>.
#2 - Introduce def_vector<T>
I.e., a convenience typedef, because typing the allocator is annoying:
using def_vector<T> = std::vector<T, gdb::default_init_allocator<T>>;
#3 - Introduce byte_vector
Because gdb_byte vectors will be the common thing, add a convenience
"byte_vector" typedef:
using byte_vector = def_vector<gdb_byte>;
which is really the same as:
std::vector<gdb_byte, gdb::default_init_allocator<gdb_byte>>;
The intent then is to make "gdb::byte_vector" be the go-to for dynamic
byte buffers. So the less friction, the better.
#4 - Adjust current code to use it.
To set the example going forward. Replace std::vector uses and also
unique_ptr<byte[]> uses.
One nice thing is that with this allocator, for changes like these:
-std::unique_ptr<byte[]> buf (new gdb_byte[some_size]);
+gdb::byte_vector buf (some_size);
fill_with_data (buf.data (), buf.size ());
the generated code is the same as before. I.e., the compiler
de-structures the vector and gets rid of the unused "reserved vs size"
related fields.
The other nice thing is that it's easier to write
gdb::byte_vector buf (size);
than
std::unique_ptr<gdb_byte[]> buf (new gdb_byte[size]);
or even (C++14):
auto buf = std::make_unique<gdb_byte[]> (size); // zero-initializes...
#5 - Suggest s/std::vector<gdb_byte>/gdb::byte_vector/ going forward.
Note that this commit actually fixes a couple of bugs where the current
code is incorrectly using "std::vector::reserve(new_size)" and then
accessing the vector's internal buffer beyond the vector's size: see
dwarf2loc.c and charset.c. That's undefined behavior and may trigger
debug mode assertion failures. With default_init_allocator,
"resize()" behaves like "reserve()" performance wise, in that it
leaves new elements with unspecified values, but, it does that safely
without triggering undefined behavior when you access those values.
gdb/ChangeLog:
2017-06-14 Pedro Alves <palves@redhat.com>
* ada-lang.c: Include "common/byte-vector.h".
(ada_value_primitive_packed_val): Use gdb::byte_vector.
* charset.c (wchar_iterator::iterate): Resize the vector instead
of reserving it.
* common/byte-vector.h: Include "common/def-vector.h".
(wchar_iterator::m_out): Now a gdb::def_vector<gdb_wchar_t>.
* cli/cli-dump.c: Include "common/byte-vector.h".
(dump_memory_to_file, restore_binary_file): Use gdb::byte_vector.
* common/byte-vector.h: New file.
* common/def-vector.h: New file.
* common/default-init-alloc.h: New file.
* dwarf2loc.c: Include "common/byte-vector.h".
(rw_pieced_value): Use gdb::byte_vector, and resize the vector
instead of reserving it.
* dwarf2read.c: Include "common/byte-vector.h".
(data_buf::m_vec): Now a gdb::byte_vector.
* gdb_regex.c: Include "common/def-vector.h".
(compiled_regex::compiled_regex): Use gdb::def_vector<char>.
* mi/mi-main.c: Include "common/byte-vector.h".
(mi_cmd_data_read_memory): Use gdb::byte_vector.
* printcmd.c: Include "common/byte-vector.h".
(print_scalar_formatted): Use gdb::byte_vector.
* valprint.c: Include "common/byte-vector.h".
(maybe_negate_by_bytes, print_decimal_chars): Use
gdb::byte_vector.
PR binutils/21591
* versados.c (versados_mkobject): Zero the allocated tdata structure.
(process_otr): Check for an invalid offset in the otr structure.
In particular this adds support for the epiphany-rtems target.
bfd/
* config.bfd (epiphany-*-elf): Accept epiphany-*-*.
ld/
* configure.tgt (epiphany-*-elf): Accept epiphany-*-*.
__start_SECNAME and __stop_SECNAME shouldn't be defined for "ld -r".
* ldlang.c (lang_set_startof): Skip if config.build_constructors
is FALSE.
* testsuite/ld-elf/sizeofc.d: New file.
* testsuite/ld-elf/startofc.d: Likewise.
I forgot this one, which is kind of related.
The function trace_start_error_with_name has moved in commit "Share
fork_inferior et al with gdbserver", so this additional include is
needed.
Fixes:
darwin-nat.c:1735:5: error: use of undeclared identifier 'trace_start_error_with_name'
trace_start_error_with_name ("close");
gdb/ChangeLog:
* darwin-nat.c: Include "nat/fork-inferior.h".
I happened to be build-testing on macOS and found this:
Undefined symbols for architecture x86_64:
"fork_inferior(char const*, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, char**, void (*)(), void (*)(int), void (*)(), char const*, void (*)(char const*, char* const*, char* const*))", referenced from:
darwin_create_inferior(target_ops*, char const*, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, char**, int) in darwin-nat.o
"startup_inferior(int, int, target_waitstatus*, ptid_t*)", referenced from:
gdb_startup_inferior(int, int) in fork-child.o
"trace_start_error(char const*, ...)", referenced from:
darwin_ptrace_me() in darwin-nat.o
"trace_start_error_with_name(char const*)", referenced from:
darwin_ptrace_me() in darwin-nat.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Adding fork-inferior.o fixes it. I factored out the Darwin bits that
are no architecture-specific in the section meant for that at the top.
I only built-tested this using Travis-CI, since I don't have access to
this platform.
gdb/ChangeLog:
* configure.nat: Factor out Darwin bits that are not
architecture-specific. Add fork-inferior.o.
Trying to build on AIX gives:
ld: 0711-317 ERROR: Undefined symbol: .trace_start_error_with_name(char const*)
ld: 0711-317 ERROR: Undefined symbol: .fork_inferior(char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, char**, void (*)(), void (*)(int), void (*)(), char const*, void (*)(char const*, char* const*, char* const*))
ld: 0711-317 ERROR: Undefined symbol: .startup_inferior(int, int, target_waitstatus*, ptid_t*)
Including fork-inferior.o in the build should help. I also factored out
the AIX bits that are not architecture-specific to be consistent with the other
OSes.
gdb/ChangeLog:
* configure.nat: Factor out AIX bits that are not
architecture-specific. Add fork-inferior.o.
Currently, linker will define __start_SECNAME and __stop_SECNAME symbols
only for orphaned sections.
However, during garbage collection, ELF linker marks all sections with
references to __start_SECNAME and __stop_SECNAME symbols as used even
when section SECNAME isn't an orphaned section and linker won't define
__start_SECNAME nor __stop_SECNAME. And ELF linker stores the first
input section whose name matches __start_SECNAME or __stop_SECNAME in
u.undef.section for garbage collection. If these symbols are provided
in linker script, u.undef.section is set to the section where they will
defined by linker script, which leads to the incorrect output.
This patch changes linker to always define referenced __start_SECNAME and
__stop_SECNAME if the input section name is the same as the output section
name, which is always true for orphaned sections, and SECNAME is a C
identifier. Also __start_SECNAME and __stop_SECNAME symbols are marked
as hidden by ELF linker so that __start_SECNAME and __stop_SECNAME symbols
for section SECNAME in different modules are unique. For garbage
collection, ELF linker stores the first matched input section in the
unused vtable field.
bfd/
PR ld/20022
PR ld/21557
PR ld/21562
PR ld/21571
* elf-bfd.h (elf_link_hash_entry): Add start_stop. Change the
vtable field to a union.
(_bfd_elf_is_start_stop): Removed.
* elf32-i386.c (elf_i386_convert_load_reloc): Also check for
__start_SECNAME and __stop_SECNAME symbols.
* elf64-x86-64.c (elf_x86_64_convert_load_reloc): Likewise.
* elflink.c (_bfd_elf_is_start_stop): Removed.
(_bfd_elf_gc_mark_rsec): Check start_stop instead of calling
_bfd_elf_is_start_stop.
(elf_gc_propagate_vtable_entries_used): Skip __start_SECNAME and
__stop_SECNAME symbols. Updated.
(elf_gc_smash_unused_vtentry_relocs): Likewise.
(bfd_elf_gc_record_vtinherit): Likewise.
(bfd_elf_gc_record_vtentry): Likewise.
ld/
PR ld/20022
PR ld/21557
PR ld/21562
PR ld/21571
* ld.texinfo: Update __start_SECNAME/__stop_SECNAME symbols.
* ldlang.c (lang_insert_orphan): Move handling of __start_SECNAME
and __stop_SECNAME symbols to ...
(lang_set_startof): Here. Also define __start_SECNAME and
__stop_SECNAME for -Ur.
* emultempl/elf32.em (gld${EMULATION_NAME}_after_open): Mark
referenced __start_SECNAME and __stop_SECNAME symbols as hidden
and set start_stop for garbage collection.
* testsuite/ld-elf/pr21562a.d: New file.
* testsuite/ld-elf/pr21562a.s: Likewise.
* testsuite/ld-elf/pr21562a.t: Likewise.
* testsuite/ld-elf/pr21562b.d: Likewise.
* testsuite/ld-elf/pr21562b.s: Likewise.
* testsuite/ld-elf/pr21562b.t: Likewise.
* testsuite/ld-elf/pr21562c.d: Likewise.
* testsuite/ld-elf/pr21562c.t: Likewise.
* testsuite/ld-elf/pr21562d.d: Likewise.
* testsuite/ld-elf/pr21562d.t: Likewise.
* testsuite/ld-elf/pr21562e.d: Likewise.
* testsuite/ld-elf/pr21562f.d: Likewise.
* testsuite/ld-elf/pr21562g.d: Likewise.
* testsuite/ld-elf/pr21562h.d: Likewise.
* testsuite/ld-elf/pr21562i.d: Likewise.
* testsuite/ld-elf/pr21562j.d: Likewise.
* testsuite/ld-elf/pr21562k.d: Likewise.
* testsuite/ld-elf/pr21562l.d: Likewise.
* testsuite/ld-elf/pr21562m.d: Likewise.
* testsuite/ld-elf/pr21562n.d: Likewise.
* testsuite/ld-gc/pr20022.d: Likewise.
* testsuite/ld-gc/pr20022a.s: Likewise.
* testsuite/ld-gc/pr20022b.s: Likewise.
* testsuite/ld-gc/gc.exp: Run PR ld/20022 tests.
* testsuite/ld-gc/pr19161.d: Also accept local __start_SECNAME
symbol.
* testsuite/ld-gc/start.d: Likewise.
* testsuite/ld-x86-64/lea1a.d: Updated.
* testsuite/ld-x86-64/lea1b.d: Updated.
* testsuite/ld-x86-64/lea1d.d: Updated.
* testsuite/ld-x86-64/lea1e.d: Likewise.
Test -Ur with __start_SECNAME, __stop_SECNAME, .startof.SECNAME and
.sizeof.SECNAME. __start_SECNAME and __stop_SECNAME should be defined
to the start and the end of section SECNAME. .startof.SECNAME and
.sizeof.SECNAME should be undefined.
* testsuite/ld-elf/sizeof.d: New file.
* testsuite/ld-elf/sizeof.s: Likewise.
* testsuite/ld-elf/startof.d: Likewise.
* testsuite/ld-elf/startof.s: Likewise.
arm-none-eabi-ld supports shared libraries. However, the toolchain may be
configured to generate statically linked executable by default.
It is required to have --no-dynamic-linker option before adding dynamic symbol
to static executable.
For dynamically linked executable, the behavior won't change.
ld/ChangeLog
2017-06-13 Renlin Li <renlin.li@arm.com>
* testsuite/ld-elf/shared.exp (build_tests): Add --no-dynamic-linker
option to rdynamic-1 and dynamic-1 tests.
Since read_pieced_value and write_pieced_value share significant logic,
this patch merges them into a single function rw_pieced_value.
gdb/ChangeLog:
* dwarf2loc.c (rw_pieced_value): New. Merge logic from...
(read_pieced_value, write_pieced_value): ...here. Reduce to
wrappers that just call rw_pieced_value.
So far write_pieced_value uses write_memory when writing memory pieces to
the target. However, this is a case where GDB potentially overwrites a
watchpoint value. In such a case write_memory_with_notification should be
used instead, so that memory_changed observers get notified.
gdb/ChangeLog:
* dwarf2loc.c (write_pieced_value): When writing the data for a
memory piece, use write_memory_with_notification instead of
write_memory.
The function read_value_memory accepts a parameter embedded_offset and
expects it to represent the byte offset into the given value. However,
the only invocation with a possibly non-zero embedded_offset happens in
read_pieced_value, where a bit offset is passed instead.
Adjust the implementation of read_value_memory to meet the caller's
expectation. This implicitly fixes the invocation in read_pieced_value.
gdb/ChangeLog:
* valops.c (read_value_memory): Change embedded_offset to
represent a bit offset instead of a byte offset.
* value.h (read_value_memory): Adjust comment.
In read_pieced_value's main loop, the variables `dest_offset_bits' and
`source_offset_bits' are basically just copies of `offset' and
`bits_to_skip', respectively. In write_pieced_value the copies are
reversed. This is not very helpful when trying to keep the logic between
these functions in sync. Since the copies are unnecessary, this patch
just removes them.
gdb/ChangeLog:
* dwarf2loc.c (read_pieced_value): Remove unnecessary variables
dest_offset_bits and source_offset_bits.
(write_pieced_value): Likewise.
So far GDB ignores the piece offset of all kinds of DWARF bit
pieces (DW_OP_bit_piece) and treats such pieces as if the offset was zero.
This is fixed, and an appropriate test is added.
gdb/ChangeLog:
* dwarf2loc.c (read_pieced_value): Respect the piece offset, as
given by DW_OP_bit_piece.
(write_pieced_value): Likewise.
Andreas Arnez <arnez@linux.vnet.ibm.com>
* gdb.dwarf2/var-access.exp: Add test for composite location with
nonzero piece offsets.
So far the main loop in read_pieced_value and write_pieced_value is
structured like this:
(1) Prepare a buffer and some variables we may need;
(2) depending on the DWARF piece type to be handled, use the buffer and
the prepared variables, ignore them, or even recalculate them.
This approach reduces readability and may also lead to unnecessary copying
of data. This patch moves the preparations to the places where sufficient
information is available and removes some of the variables involved.
gdb/ChangeLog:
* dwarf2loc.c (read_pieced_value): Move the buffer allocation and
some other preparations to the places where sufficient information
is available.
(write_pieced_value): Likewise.
For big-endian targets the logic in read/write_pieced_value tries to take
a register piece from the LSB end. This requires offsets and sizes to be
adjusted accordingly, and that's where the current implementation has some
issues:
* The formulas for recalculating the bit- and byte-offsets into the
register are wrong. They just happen to yield correct results if
everything is byte-aligned and the piece's last byte belongs to the
given value.
* After recalculating the bit offset into the register, the number of
bytes to be copied from the register is not recalculated. Of course
this does not matter if everything (particularly the piece size) is
byte-aligned.
These issues are fixed. The size calculation is performed with a new
helper function bits_to_bytes().
gdb/ChangeLog:
* dwarf2loc.c (bits_to_bytes): New function.
(read_pieced_value): Fix offset calculations for register pieces
on big-endian targets.
(write_pieced_value): Likewise.
gdb/testsuite/ChangeLog:
* gdb.dwarf2/var-access.exp: Add test for non-byte-aligned
register pieces.
When the variable 'buffer_size' in read_pieced_value and
write_pieced_value was introduced, it was needed for tracking the buffer's
allocated size. Now that the buffer's data type has been changed to a
std::vector, the variable is no longer necessary; so remove it.
gdb/ChangeLog:
* dwarf2loc.c (read_pieced_value): Remove buffer_size variable.
(write_pieced_value): Likewise.
This verifies some of the previous fixes to the logic in
write_pieced_value when accessing bit-fields.
gdb/testsuite/ChangeLog:
* gdb.dwarf2/var-access.exp: Add tests for accessing bit-fields
located in one or more DWARF pieces.
On big-endian targets, when targeting a bit-field, write_pieced_value
currently transfers the source value's *most* significant bits to the
target value, instead of its least significant bits. This is fixed.
In particular the fix adjusts the initial value of 'offset', which can now
potentially be nonzero. Thus the variable 'type_len' is renamed to
'max_offset', to avoid confusion. And for consistency, the affected logic
that was mirrored in read_pieced_value is changed there in the same way.
gdb/ChangeLog:
* dwarf2loc.c (write_pieced_value): When writing to a bit-field,
transfer the source value's least significant bits, instead of its
lowest-addressed ones. Rename type_len to max_offset.
(read_pieced_value): Mirror above changes to write_pieced_value as
applicable.
In write_pieced_value, when transferring the data to target memory via a
buffer, the bit offset within the target value is not reduced to its
sub-byte fraction before using it as a bit offset into the buffer. This
is fixed.
gdb/ChangeLog:
* dwarf2loc.c (write_pieced_value): In DWARF_VALUE_MEMORY,
truncate full bytes from dest_offset_bits before using it as an
offset into the buffer.
In write_pieced_value, when checking whether the data can be transferred
byte-wise, the current logic verifies the source- and destination offsets
to be byte-aligned, but not the transfer size. This is fixed.
gdb/ChangeLog:
* dwarf2loc.c (write_pieced_value): Include transfer size in
byte-wise check.
In write_pieced_value, the number of bytes containing a portion of the
bit-field in a given piece is calculated with the wrong starting offset;
thus the result may be off by one. This bug was probably introduced when
copying this logic from read_pieced_value. Fix it.
gdb/ChangeLog:
* dwarf2loc.c (write_pieced_value): Fix copy/paste error in the
calculation of this_size.
In the case of targeting a bit-field, read_pieced_value and
write_pieced_value calculate the number of bits preceding the bit-field
without considering the relative offset of the value's parent. This is
relevant for a structure variable like this:
struct s {
uint64_t foo;
struct {
uint32_t bar;
uint32_t bf : 10; /* <-- target bit-field */
} baz;
} s;
In this scenario, if 'val' is a GDB value representing s.baz.bf,
val->parent represents the whole s.baz structure, and the following holds:
- value_offset (val) == sizeof s.baz.bar == 4
- value_offset (val->parent) == sizeof s.foo == 8
The current logic would only use value_offset(val), resulting in the wrong
offset into the target value. This is fixed.
gdb/ChangeLog:
* dwarf2loc.c (read_pieced_value): Respect parent value's offset
when targeting a bit-field.
(write_pieced_value): Likewise.
The test suite contains multiple instances of determining the target's
endianness with GDB's "show endian" command. This patch replaces these by
an invocation of a new convenience proc 'get_endianness'.
gdb/testsuite/ChangeLog:
* lib/gdb.exp (get_endianness): New proc.
* gdb.arch/aarch64-fp.exp: Use it.
* gdb.arch/altivec-regs.exp: Likewise.
* gdb.arch/e500-regs.exp: Likewise.
* gdb.arch/vsx-regs.exp: Likewise.
* gdb.base/dump.exp: Likewise.
* gdb.base/funcargs.exp: Likewise.
* gdb.base/gnu_vector.exp: Likewise.
* gdb.dwarf2/formdata16.exp: Likewise.
* gdb.dwarf2/implptrpiece.exp: Likewise.
* gdb.dwarf2/nonvar-access.exp: Likewise.
* gdb.python/py-inferior.exp: Likewise.
* gdb.trace/unavailable-dwarf-piece.exp: Likewise.
The addr_size field in the piece_closure data structure is a relic from
before introducing the typed DWARF stack. It is obsolete now. This patch
removes it.
gdb/ChangeLog:
* dwarf2loc.c (struct piece_closure) <addr_size>: Remove field.
(allocate_piece_closure): Drop addr_size parameter.
(dwarf2_evaluate_loc_desc_full): Adjust call to
allocate_piece_closure.
When taking a DW_OP_piece or DW_OP_bit_piece from a DW_OP_stack_value, the
existing logic always takes the piece from the lowest-addressed end, which
is wrong on big-endian targets. The DWARF standard states that the
"DW_OP_bit_piece operation describes a sequence of bits using the least
significant bits of that value", and this also matches the current logic
in GCC. For instance, the GCC guality test case pr54970.c fails on s390x
because of this.
This fix adjusts the piece accordingly on big-endian targets. It is
assumed that:
* DW_OP_piece shall take the piece from the LSB end as well;
* pieces reaching outside the stack value bits are considered undefined,
and a zero value can be used instead.
gdb/ChangeLog:
PR gdb/21226
* dwarf2loc.c (read_pieced_value): Anchor stack value pieces at
the LSB end, independent of endianness.
gdb/testsuite/ChangeLog:
PR gdb/21226
* gdb.dwarf2/nonvar-access.exp: Add checks for verifying that
stack value pieces are taken from the LSB end.
A field f in a structure composed of DWARF pieces may be located in
multiple pieces, where the first and last of those may contain bits from
other fields as well. So when writing to f, the beginning of the first
and the end of the last of those pieces may have to be skipped. But the
logic in write_pieced_value for handling one of those pieces is flawed
when the first and last piece are the same, i.e., f is contained in a
single piece:
< - - - - - - - - - piece_size - - - - - - - - - ->
+-------------------------------------------------+
| skipped_bits | f_bits | / / / / / / / / / / |
+-------------------------------------------------+
The current logic determines the size of the sub-piece to operate on by
limiting the piece size to the bit size of f and then subtracting the
skipped bits:
min (piece_size, f_bits) - skipped_bits
Instead of:
min (piece_size - skipped_bits, f_bits)
So the resulting sub-piece size is corrupted, leading to wrong handling of
this piece in write_pieced_value.
Note that the same bug was already found in read_pieced_value and fixed
there (but not in write_pieced_value), see PR 15391.
This patch swaps the calculations, bringing them into the same (correct)
order as in read_pieced_value.
gdb/ChangeLog:
* dwarf2loc.c (write_pieced_value): Fix order of calculations for
size capping.
gdb/testsuite/ChangeLog:
* gdb.dwarf2/var-pieces.exp: Add test case for modifying a
variable at nonzero offset.
This adds a test for read/write access to variables with various types of
DWARF locations. It uses register- and memory locations and composite
locations with register- and memory pieces.
Since the new test calls gdb_test_no_output with commands that contain
braces, it is necessary for string_to_regexp to quote braces as well.
This was not done before.
gdb/testsuite/ChangeLog:
* gdb.dwarf2/var-access.c: New file.
* gdb.dwarf2/var-access.exp: New test.
* lib/gdb-utils.exp (string_to_regexp): Quote braces as well.
All target descriptions except mips initialization are called in -tdep.c,
instead of -nat.c, so this patch moves mips target descriptions
initialization to -tdep.c. Secondly, I want to change the target
descriptions from pre-generated to dynamical creation, so I want to test
that these pre-generated target descriptions equal to these dynamically
created ones. Move target descriptions initialization to -tdep.c files so
we can test them in any hosts (if they are still -nat.c, we can only test
them on mips-linux host.).
gdb:
2017-06-13 Yao Qi <yao.qi@linaro.org>
* mips-linux-nat.c: Move include features/mips*-linux.c to
mips-linux-tdep.c.
(_initialize_mips_linux_nat): Move initialize_tdesc_mips* calls
to mips-linux-tdep.c.
* mips-linux-tdep.c: Include features/mips*-linux.c
(_initialize_mips_linux_tdep): Call initialize_tdesc_mips*
functions.
* mips-linux-tdep.h (tdesc_mips_linux): Declare.
(tdesc_mips_dsp_linux, tdesc_mips64_linux): Declare.
(tdesc_mips64_dsp_linux): Declare.
Now that print_scalar_formatted is more capable, there's no need for
val_print_type_code_int. This patch removes it in favor of
val_print_scalar_formatted.
2017-06-12 Tom Tromey <tom@tromey.com>
* valprint.h (val_print_type_code_int): Remove.
* valprint.c (generic_val_print_int): Always call
val_print_scalar_formatted.
(val_print_type_code_int): Remove.
* printcmd.c (print_scalar_formatted): Handle options->format==0.
* f-valprint.c (f_val_print): Use val_print_scalar_formatted.
* c-valprint.c (c_val_print_int): Use val_print_scalar_formatted.
* ada-valprint.c (ada_val_print_num): Use
val_print_scalar_formatted.
This unifies the two switches in print_scalar_formatted, removing some
now-redundant code. Now scalar types are never converted to LONGEST,
instead printing is done using print_*_chars, operating on the byte
representation.
ChangeLog
2017-06-12 Tom Tromey <tom@tromey.com>
* printcmd.c (print_scalar_formatted): Unify the two switches.
Don't convert scalars to LONGEST.
2017-06-12 Tom Tromey <tom@tromey.com>
* gdb.arch/altivec-regs.exp: Expect decimal results for uint128.
mips_eabi_push_dummy_call is storing the address of a struct in a
buffer that must have the same of the confisued/set ABI register size.
Add a define for the maximum ABI size and use it to size the local
buffer. Also rename the 'regsize' local to 'abi_regsize' for clarity.
Tested that --enable-targets=all still builds.
gdb/ChangeLog:
2017-06-12 Pedro Alves <palves@redhat.com>
Alan Hayward <alan.hayward@arm.com>
* mips-tdep.c (MAX_MIPS_ABI_REGSIZE): New.
(mips_eabi_push_dummy_call): Rename local 'regsize' to
'abi_regsize'. Rename local array 'valbuf' to 'ref_valbuf', and
use MAX_MIPS_ABI_REGSIZE instead of MAX_REGISTER_SIZE to size it.
Assert that abi_regsize bytes fit in 'ref_valbuf'.
... instead of vector of pointers
There's no real reason for having mapped_symtab::data be a vector of
heap-allocated symtab_index_entries. symtab_index_entries is not that
large, it's movable, and it's cheap to move. Making the vector hold
values instead improves cache locality and eliminates many roundtrips
to the heap.
Using the same test as in the previous patch, against the same gdb
inferior, timing improves ~13% further:
~6.0s => ~5.2s (average of 5 runs).
Note that before the .gdb_index C++ifycation patch, we were at ~5.7s.
We're now consistenly better than before.
gdb/ChangeLog
2017-06-12 Pedro Alves <palves@redhat.com>
* dwarf2read.c (mapped_symtab::data): Now a vector of
symtab_index_entry instead of vector of
std::unique_ptr<symtab_index_entry>. All users adjusted to check
whether an element's name is NULL instead of checking whether the
element itself is NULL.
(find_slot): Change return type. Adjust.
(hash_expand, , add_index_entry, uniquify_cu_indices)
(write_hash_table): Adjust.
H.J. Lu
Nick Clifton
Andreas Arnez
Georg-Johann Lay
Pedro Alves
Andre Vieira
Sebastian Huber
GDB Administrator
Simon Marchi
Georg-Johann Lay
Renlin Li
Yao Qi
Tom Tromey