This patch changes how complex types are created. init_complex_type
and arch_complex_type are unified, and complex types are reused, by
attaching them to the underlying scalar type.
gdb/ChangeLog
2020-04-01 Tom Tromey <tom@tromey.com>
* stabsread.c (rs6000_builtin_type, read_sun_floating_type)
(read_range_type): Update.
* mdebugread.c (basic_type): Update.
* go-lang.c (build_go_types): Use init_complex_type.
* gdbtypes.h (struct main_type) <complex_type>: New member.
(init_complex_type): Update.
(arch_complex_type): Don't declare.
* gdbtypes.c (init_complex_type): Remove "objfile" parameter.
Make name if none given. Use alloc_type_copy. Look for cached
complex type.
(arch_complex_type): Remove.
(gdbtypes_post_init): Use init_complex_type.
* f-lang.c (build_fortran_types): Use init_complex_type.
* dwarf2/read.c (read_base_type): Update.
* d-lang.c (build_d_types): Use init_complex_type.
* ctfread.c (read_base_type): Update.
Use std::abs so that we get the C++ overloaded version that matches
the argument type instead of the C abs function which is only for int
arguments.
There should be no user visible change after this commit.
gdb/ChangeLog:
* gdbtypes.c (create_array_type_with_stride): Use std::abs not
abs.
This commit adds support for negative Fortran array strides in one
limited case, that is the case of a single element array with a
negative array stride.
The changes in this commit will be required in order for more general
negative array stride support to work correctly, however, right now
other problems in GDB prevent negative array strides from working in
the general case.
The reason negative array strides don't currently work in the general
case is that when dealing with such arrays, the base address for the
objects data is actually the highest addressed element, subsequent
elements are then accessed with a negative offset from that address,
and GDB is not currently happy with this configuration.
The changes here can be summarised as, stop treating signed values as
unsigned, specifically, the array stride, and offsets calculated using
the array stride.
This issue was identified on the mailing list by Sergio:
https://sourceware.org/ml/gdb-patches/2020-01/msg00360.html
The test for this issue is a new one written by me as the copyright
status of the original test is currently unknown.
gdb/ChangeLog:
* gdbtypes.c (create_array_type_with_stride): Handle negative
array strides.
* valarith.c (value_subscripted_rvalue): Likewise.
gdb/testsuite/ChangeLog:
* gdb.fortran/derived-type-striding.exp: Add a new test.
* gdb.fortran/derived-type-striding.f90: Add pointer variable for
new test.
Extend GDB's internal representation of types to include the
DW_AT_calling_convention, DW_AT_defaulted, and DW_AT_deleted attributes
that were introduced in DWARF5.
These attributes will be helpful in a future patch about infcall'ing
functions with call-by-value parameters. GDB will use the attributes
to decide whether the type of a call-by-value parameter is implicitly
pass-by-reference.
gdb/ChangeLog:
2019-12-20 Tankut Baris Aktemur <tankut.baris.aktemur@intel.com>
* dwarf2read.c (dwarf2_add_member_fn): Read the DW_AT_defaulted
and DW_AT_deleted attributes of a function.
(read_structure_type): Read the DW_AT_calling_convention attribute
of a type.
(is_valid_DW_AT_defaulted): New function.
(is_valid_DW_AT_calling_convention_for_type): New function.
* gdbtypes.h: Include dwarf2.h.
(struct fn_field)<defaulted>: New field to store the
DW_AT_defaulted attribute.
(struct fn_field)<is_deleted>: New field to store the
DW_AT_deleted attribute.
(struct cplus_struct_type)<calling_convention>: New field to store
the DW_AT_calling_convention attribute.
(TYPE_FN_FIELD_DEFAULTED): New macro.
(TYPE_FN_FIELD_DELETED): New macro.
(TYPE_CPLUS_CALLING_CONVENTION): New macro.
* gdbtypes.c (dump_fn_fieldlists): Update for the changes made
to the .h file.
(print_cplus_stuff): Likewise.
Change-Id: I54192f363115b78ec7435a8563b73fcace420765
Passing an lvalue argument to a function that takes an rvalue parameter
is not allowed per C++ rules. Consider this function:
int g (int &&x) { return x; }
Calling g as in
int i = 5;
int j = g (i);
is illegal. For instance, GCC 9.2.1 yields
~~~
test.cpp: In function ‘int main()’:
test.cpp:6:14: error: cannot bind rvalue reference of type ‘int&&’ to
lvalue of type ‘int’
6 | int j = g (i);
| ^
~~~
GDB currently allows this function call:
~~~
(gdb) print g(i)
$1 = 5
~~~
Fix this by ranking an lvalue argument incompatible with an rvalue
parameter. The behavior after this patch is:
~~~
(gdb) print g(i)
Cannot resolve function g to any overloaded instance
~~~
Tested with GCC 9.2.1.
gdb/ChangeLog:
2019-12-09 Tankut Baris Aktemur <tankut.baris.aktemur@intel.com>
* gdbtypes.c (rank_one_type): Return INCOMPATIBLE_TYPE_BADNESS
when ranking an lvalue argument for an rvalue parameter.
gdb/testsuite/ChangeLog:
2019-12-09 Tankut Baris Aktemur <tankut.baris.aktemur@intel.com>
* gdb.cp/rvalue-ref-overload.cc (g): New function that takes
an rvalue parameter.
* gdb.cp/rvalue-ref-overload.exp: Test calling it with an lvalue
parameter.
Change-Id: I4a6dfc7dac63efa1e3b9f8f391e4b736fbdccdc1
This avoids a conflict with a system "struct bcache" on
Solaris (see e.g.
https://www.isi.edu/nsnam/archive/ns-users/webarch/2001/msg05393.html)
Note that the Solaris conflict for now only surfaces with
--enable-targets=all (which the build bot doesn't use).
gdb/ChangeLog:
2019-12-06 Christian Biesinger <cbiesinger@google.com>
* bcache.c: Put in namespace gdb.
* bcache.h: Likewise.
* gdbtypes.c (check_types_worklist): Update.
(types_deeply_equal): Update.
* macrotab.c (struct macro_table) <bcache>: Update.
(new_macro_table): Update.
* macrotab.h (struct bcache): Put this forward declaration
inside namespace gdb.
(new_macro_table): Update.
* objfiles.h (struct objfile_per_bfd_storage) <filename_cache>:
Update.
<macro_cache>: Update.
* psymtab.h: (psymtab_storage) <psymbol_cache>: Update.
Change-Id: I843d5e91f7ccb3db6d1099a8214c15a74510256f
The overload resolution mechanism assigns badness values to the
necessary conversions to be made on types to pick a champion. A
badness value consists of a "rank" that scores the conversion and a
"subrank" to differentiate conversions of the same kind.
An auxiliary function, 'sum_ranks', is used for adding two badness
values. In all of its uses, except two, 'sum_ranks' is used for
populating the subrank of a badness value. The two exceptions are in
'rank_one_type':
~~~
/* See through references, since we can almost make non-references
references. */
if (TYPE_IS_REFERENCE (arg))
return (sum_ranks (rank_one_type (parm, TYPE_TARGET_TYPE (arg), NULL),
REFERENCE_CONVERSION_BADNESS));
if (TYPE_IS_REFERENCE (parm))
return (sum_ranks (rank_one_type (TYPE_TARGET_TYPE (parm), arg, NULL),
REFERENCE_CONVERSION_BADNESS));
~~~
Here, the result of a recursive call is combined with
REFERENCE_CONVERSION_BADNESS. This leads to the problem of
over-punishment by combining two ranks. Consider this:
void an_overloaded_function (const foo &);
void an_overloaded_function (const foo &&);
...
foo arg;
an_overloaded_function(arg);
When ranking 'an_overloaded_function (const foo &)', the badness
values REFERENCE_CONVERSION_BADNESS and CV_CONVERSION_BADNESS are
combined, whereas 'rank_one_type' assigns only the
REFERENCE_CONVERSION_BADNESS value to 'an_overloaded_function (const
foo &&)' (there is a different execution flow for that). This yields
in GDB picking the latter function as the overload champion instead of
the former.
In fact, the 'rank_one_type' function should have given
'an_overloaded_function (const foo &)' the CV_CONVERSION_BADNESS
value, with the see-through referencing increasing the subrank a
little bit. This can be achieved by introducing a new badness value,
REFERENCE_SEE_THROUGH_BADNESS, which bumps up the subrank only, and
using it in the two "exceptional" cases of 'sum_ranks'.
gdb/ChangeLog:
2019-12-06 Tankut Baris Aktemur <tankut.baris.aktemur@intel.com>
* gdbtypes.h: Define the REFERENCE_SEE_THROUGH_BADNESS value.
* gdbtypes.c (rank_one_type): Use REFERENCE_SEE_THROUGH_BADNESS
for ranking see-through reference cases.
gdb/testsuite/ChangeLog:
2019-12-06 Tankut Baris Aktemur <tankut.baris.aktemur@intel.com>
* gdb.cp/rvalue-ref-overload.cc: Add a case that involves both
CV and reference conversion for overload resolution.
* gdb.cp/rvalue-ref-overload.exp: Test it.
Change-Id: I39ae6505ab85ad0bd21915368c82540ceeb3aae9
A subrange type should inherit its endianity from its base type.
gdb/ChangeLog
2019-12-04 Tom Tromey <tromey@adacore.com>
* gdbtypes.c (create_range_type): Inherit endianity
from base type.
gdb/testsuite/ChangeLog
2019-12-04 Tom Tromey <tromey@adacore.com>
* gdb.ada/scalar_storage/storage.adb: New file.
* gdb.ada/scalar_storage/pck.adb: New file.
* gdb.ada/scalar_storage/pck.ads: New file.
* gdb.ada/scalar_storage.exp: New file.
Change-Id: I2998ab919dc28aeff097763c4242f9bfb90823a3
I failed to notice that the scalar_storage_order patch put
type_byte_order at the end of gdbtypes.c. The end of the file is
normally where the file's _initialize function goes. This moves
type_byte_order earlier, into a more relevant section.
gdb/ChangeLog
2019-12-04 Tom Tromey <tromey@adacore.com>
* gdbtypes.c (type_byte_order): Move earlier. Assert for unknown
endian-ness.
Change-Id: I4666431ecbb32ec98918f39f72d22c86b2bc8dde
Testing the scalar_storage_order patch pointed out that it does not
handle floating point properly. This patch fixes this problem.
gdb/ChangeLog
2019-12-04 Tom Tromey <tromey@adacore.com>
* dwarf2read.c (dwarf2_init_float_type)
(dwarf2_init_complex_target_type): Add byte_order parameter.
(read_base_type): Compute byte order earlier.
* gdbtypes.c (init_float_type): Add byte_order parameter.
* gdbtypes.h (init_float_type): Add byte_order parameter.
gdb/testsuite/ChangeLog
2019-12-04 Tom Tromey <tromey@adacore.com>
* gdb.base/endianity.c (struct otherendian) <f>: New field.
(main): Initialize it.
* gdb.base/endianity.exp: Update.
Change-Id: Ic02eb711d80ce678ef0ecf8c506a626e441b8440
Add support for strings with dynamic length using the DWARF attribute
DW_AT_string_length.
Currently gFortran generates DWARF for some strings that make use of
DW_AT_string_length like this:
<1><2cc>: Abbrev Number: 20 (DW_TAG_string_type)
<2cd> DW_AT_string_length: 5 byte block: 99 bd 1 0 0 (DW_OP_call4: <0x1bd>)
<2d3> DW_AT_byte_size : 4
<2d4> DW_AT_sibling : <0x2e2>
In this type entry the DW_AT_string_length attribute references a
second DW_TAG_formal_parameter that contains the string length. The
DW_AT_byte_size indicates that the length is a 4-byte value.
This commit extends GDB's DWARF parsing for strings so that we can
create dynamic types as well as static types, based on the attribute
the DWARF contains.
I then extend the dynamic type resolution code in gdbtypes.c to add
support for resolving dynamic strings.
gdb/ChangeLog:
* dwarf2read.c (read_tag_string_type): Read the fields required to
make a dynamic string, and possibly create a dynamic range for the
string.
(attr_to_dynamic_prop): Setup is_reference based on the type of
attribute being processed.
* gdbtypes.c (is_dynamic_type_internal): Handle TYPE_CODE_STRING.
(resolve_dynamic_array): Rename to...
(resolve_dynamic_array_or_string): ...this, update header comment,
and accept TYPE_CODE_STRING.
(resolve_dynamic_type_internal): Handle TYPE_CODE_STRING.
gdb/testsuite/ChangeLog:
* gdb.fortran/array-slices.exp: Add test for dynamic strings.
Change-Id: I03f2d181b26156f48f27a03c8a59f9bd4d71ac17
Currently GDB supports a byte or bit stride on arrays, in DWARF this
would be DW_AT_bit_stride or DW_AT_byte_stride on DW_TAG_array_type.
However, DWARF can also support DW_AT_byte_stride or DW_AT_bit_stride
on DW_TAG_subrange_type, the tag used to describe each dimension of an
array.
Strides on subranges are used by gFortran to represent Fortran arrays,
and this commit adds support for this to GDB.
I've extended the range_bounds struct to include the stride
information. The name is possibly a little inaccurate now, but this
still sort of makes sense, the structure represents information about
the bounds of the range, and also how to move from the lower to the
upper bound (the stride).
I've added initial support for bit strides, but I've never actually
seen an example of this being generated. Further, I don't really see
right now how GDB would currently handle a bit stride that was not a
multiple of the byte size as the code in, for example,
valarith.c:value_subscripted_rvalue seems geared around byte
addressing. As a consequence if we see a bit stride that is not a
multiple of 8 then GDB will give an error.
gdb/ChangeLog:
* dwarf2read.c (read_subrange_type): Read bit and byte stride and
create a range with stride where appropriate.
* f-valprint.c: Include 'gdbarch.h'.
(f77_print_array_1): Take the stride into account when walking the
array. Also convert the stride into addressable units.
* gdbtypes.c (create_range_type): Initialise the stride to
constant zero.
(create_range_type_with_stride): New function, initialise the
range as normal, and then setup the stride.
(has_static_range): Include the stride here. Also change the
return type to bool.
(create_array_type_with_stride): Consider the range stride if the
array isn't given its own stride.
(resolve_dynamic_range): Resolve the stride if needed.
* gdbtypes.h (struct range_bounds) <stride>: New member variable.
(struct range_bounds) <flag_is_byte_stride>: New member variable.
(TYPE_BIT_STRIDE): Define.
(TYPE_ARRAY_BIT_STRIDE): Define.
(create_range_type_with_stride): Declare.
* valarith.c (value_subscripted_rvalue): Take range stride into
account when walking the array.
gdb/testsuite/ChangeLog:
* gdb.fortran/derived-type-striding.exp: New file.
* gdb.fortran/derived-type-striding.f90: New file.
* gdb.fortran/array-slices.exp: New file.
* gdb.fortran/array-slices.f90: New file.
Change-Id: I9af2bcd1f2d4c56f76f5f3f9f89d8f06bef10d9a
- Rationale:
It is possible for compilers to indicate the desired byte order
interpretation of scalar variables using the DWARF attribute:
DW_AT_endianity
A type flagged with this variable would typically use one of:
DW_END_big
DW_END_little
which instructs the debugger what the desired byte order interpretation
of the variable should be.
The GCC compiler (as of V6) has a mechanism for setting the desired byte
ordering of the fields within a structure or union. For, example, on a
little endian target, a structure declared as:
struct big {
int v;
short a[4];
} __attribute__( ( scalar_storage_order( "big-endian" ) ) );
could be used to ensure all the structure members have a big-endian
interpretation (the compiler would automatically insert byte swap
instructions before and after respective store and load instructions).
- To reproduce
GCC V8 is required to correctly emit DW_AT_endianity DWARF attributes
in all situations when the scalar_storage_order attribute is used.
A fix for (dwarf endianity instrumentation) for GCC V6-V7 can be found
in the URL field of the following PR:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82509
- Test-case:
A new test case (testsuite/gdb.base/endianity.*) is included with this
patch.
Manual testing for mixed endianity code has also been done with GCC V8.
See:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82509#c4
- Observed vs. expected:
Without this change, using scalar_storage_order that doesn't match the
target, such as
struct otherendian
{
int v;
} __attribute__( ( scalar_storage_order( "big-endian" ) ) );
would behave like the following on a little endian target:
Breakpoint 1 at 0x401135: file endianity.c, line 41.
(gdb) run
Starting program: /home/pjoot/freeware/t/a.out
Missing separate debuginfos, use: debuginfo-install glibc-2.17-292.el7.x86_64
Breakpoint 1, main () at endianity.c:41
41 struct otherendian o = {3};
(gdb) n
43 do_nothing (&o); /* START */
(gdb) p o
$1 = {v = 50331648}
(gdb) p /x
$2 = {v = 0x3000000}
whereas with this gdb enhancement we can access the variable with the user
specified endianity:
Breakpoint 1, main () at endianity.c:41
41 struct otherendian o = {3};
(gdb) p o
$1 = {v = 0}
(gdb) n
43 do_nothing (&o); /* START */
(gdb) p o
$2 = {v = 3}
(gdb) p o.v = 4
$3 = 4
(gdb) p o.v
$4 = 4
(gdb) x/4xb &o.v
0x7fffffffd90c: 0x00 0x00 0x00 0x04
(observe that the 4 byte int variable has a big endian representation in the
hex dump.)
gdb/ChangeLog
2019-11-21 Peeter Joot <peeter.joot@lzlabs.com>
Byte reverse display of variables with DW_END_big, DW_END_little
(DW_AT_endianity) dwarf attributes if different than the native
byte order.
* ada-lang.c (ada_value_binop):
Use type_byte_order instead of gdbarch_byte_order.
* ada-valprint.c (printstr):
(ada_val_print_string):
* ada-lang.c (value_pointer):
(ada_value_binop):
Use type_byte_order instead of gdbarch_byte_order.
* c-lang.c (c_get_string):
Use type_byte_order instead of gdbarch_byte_order.
* c-valprint.c (c_val_print_array):
Use type_byte_order instead of gdbarch_byte_order.
* cp-valprint.c (cp_print_class_member):
Use type_byte_order instead of gdbarch_byte_order.
* dwarf2loc.c (rw_pieced_value):
Use type_byte_order instead of gdbarch_byte_order.
* dwarf2read.c (read_base_type): Handle DW_END_big,
DW_END_little
* f-lang.c (f_get_encoding):
Use type_byte_order instead of gdbarch_byte_order.
* findvar.c (default_read_var_value):
Use type_byte_order instead of gdbarch_byte_order.
* gdbtypes.c (check_types_equal):
Require matching TYPE_ENDIANITY_NOT_DEFAULT if set.
(recursive_dump_type): Print TYPE_ENDIANITY_BIG,
and TYPE_ENDIANITY_LITTLE if set.
(type_byte_order): new function.
* gdbtypes.h (TYPE_ENDIANITY_NOT_DEFAULT): New macro.
(struct main_type) <flag_endianity_not_default>:
New field.
(type_byte_order): New function.
* infcmd.c (default_print_one_register_info):
Use type_byte_order instead of gdbarch_byte_order.
* p-lang.c (pascal_printstr):
Use type_byte_order instead of gdbarch_byte_order.
* p-valprint.c (pascal_val_print):
Use type_byte_order instead of gdbarch_byte_order.
* printcmd.c (print_scalar_formatted):
Use type_byte_order instead of gdbarch_byte_order.
* solib-darwin.c (darwin_current_sos):
Use type_byte_order instead of gdbarch_byte_order.
* solib-svr4.c (solib_svr4_r_ldsomap):
Use type_byte_order instead of gdbarch_byte_order.
* stap-probe.c (stap_modify_semaphore):
Use type_byte_order instead of gdbarch_byte_order.
* target-float.c (target_float_same_format_p):
Use type_byte_order instead of gdbarch_byte_order.
* valarith.c (scalar_binop):
(value_bit_index):
Use type_byte_order instead of gdbarch_byte_order.
* valops.c (value_cast):
Use type_byte_order instead of gdbarch_byte_order.
* valprint.c (generic_emit_char):
(generic_printstr):
(val_print_string):
Use type_byte_order instead of gdbarch_byte_order.
* value.c (unpack_long):
(unpack_bits_as_long):
(unpack_value_bitfield):
(modify_field):
(pack_long):
(pack_unsigned_long):
Use type_byte_order instead of gdbarch_byte_order.
* findvar.c (unsigned_pointer_to_address):
(signed_pointer_to_address):
(unsigned_address_to_pointer):
(address_to_signed_pointer):
(default_read_var_value):
(default_value_from_register):
Use type_byte_order instead of gdbarch_byte_order.
* gnu-v3-abi.c (gnuv3_make_method_ptr):
Use type_byte_order instead of gdbarch_byte_order.
* riscv-tdep.c (riscv_print_one_register_info):
Use type_byte_order instead of gdbarch_byte_order.
gdb/testsuite/ChangeLog
2019-11-21 Peeter Joot <peeter.joot@lzlabs.com>
* gdb.base/endianity.c: New test.
* gdb.base/endianity.exp: New file.
Change-Id: I4bd98c1b4508c2d7c5a5dbb15d7b7b1cb4e667e2
In Ada, the programmer can request that a range type with a non-zero
base be stored in the minimal number of bits required for the range.
This is done by biasing the values; so, for example, a range of -7..-4
may be stored as two bits with a bias of -7.
This patch implements this for gdb. It is done by adding a bias to
struct range_bounds and then adjusting a few spots to handle this.
The test case is written to use -fgnat-encodings=minimal, but a future
compiler patch will change the compiler to emit DW_AT_GNU_bias with
-fgnat-encodings=gdb. It seemed good to get the gdb patch in first.
Tested on x86-64 Fedora 29; plus a variety of targets using AdaCore's
internal test suite.
gdb/ChangeLog
2019-09-03 Tom Tromey <tromey@adacore.com>
* ada-valprint.c (ada_val_print_num): Don't recurse for range
types.
(has_negatives): Unbias a range type bound.
* dwarf2read.c (read_subrange_type): Handle DW_AT_GNU_bias.
* gdbtypes.c (operator==): Handle new field.
(create_range_type): Add "bias" parameter.
(create_static_range_type, resolve_dynamic_range): Update.
* gdbtypes.h (struct range_bounds) <bias>: New member.
(create_range_type): Add bias parameter.
* printcmd.c (print_scalar_formatted): Unbias range types.
* value.c (unpack_long): Unbias range types.
(pack_long): Bias range types.
gdb/testsuite/ChangeLog
2019-09-03 Tom Tromey <tromey@adacore.com>
* gdb.ada/bias.exp: New file.
* gdb.ada/bias/bias.adb: New file.
* gdb.ada/print_chars.exp: Add regression test.
* gdb.ada/print_chars/foo.adb (My_Character): New type.
(MC): New variable.
If a DW_TAG_subrange_type DWARF entry has no DW_AT_type then a default
type based on the size of an address on the current target is assumed.
We store this type as the target type for GDB's range types.
Currently GDB can create ranges for which the target type is VOID,
this is incorrect but seems to cause no problems. I believe the reason
this doesn't cause any issues is because the languages (for example
Ada) that actually make use of a ranges target type also have
compilers that generate DWARF that includes a DW_AT_type attribute.
However, gfortran does not include a DW_AT_type, its DWARF instead
relies on the default target type. This isn't currently a problem for
GDB as gfortran doesn't make use of the target type when printing
subranges, but it shouldn't hurt to fix this issue now.
I've added an assert into create_range_type that will catch this issue
if it comes up again.
This was tested on an x86-64/GNU-Linux machine with both the Ada and
gfortran compilers available with both '--target_board=unix' and
'--target_board=unix/-m32'. There are no user visible changes after
this commit.
gdb/ChangeLog:
* dwarf2read.c (read_subrange_index_type): New function.
(read_subrange_type): Move code into new function and call it.
* gdbtypes.c (create_range_type): Add some asserts.
Convert dwarf2_evaluate_property to return a bool, there should be no
user visible change after this commit.
gdb/ChangeLog:
* dwarf2loc.c (dwarf2_evaluate_property): Change return type, and
update return statements.
* dwarf2loc.h (dwarf2_evaluate_property): Update return type on
declaration, and update comment to match.
* gdbtypes.c (resolve_dynamic_array): Update call to
dwarf2_evaluate_property to match new return type.
This changes gdbtypes.c to use the type-safe registry API.
gdb/ChangeLog
2019-05-08 Tom Tromey <tom@tromey.com>
* gdbtypes.c (objfile_type_data): Change type.
(objfile_type, _initialize_gdbtypes): Update.
The current code in gdbtypes.c:type_align incorrectly returns 0 as the
alignment for a structure containing only static fields. After this
patch the correct value of 1 is returned. The gdb.base/align.exp test
is extended to cover this case.
gdb/ChangeLog:
* gdbtypes.c (type_align): A struct with no non-static fields also
has alignment of 1.
gdb/testsuite/ChangeLog:
* gdb.base/align.exp: Extend test to cover structures containing
only static fields.
This rewrites gdb's TRY/CATCH to plain C++ try/catch. The patch was
largely written by script, though one change (to a comment in
common-exceptions.h) was reverted by hand.
gdb/ChangeLog
2019-04-08 Tom Tromey <tom@tromey.com>
* xml-support.c: Use C++ exception handling.
* x86-linux-nat.c: Use C++ exception handling.
* windows-nat.c: Use C++ exception handling.
* varobj.c: Use C++ exception handling.
* value.c: Use C++ exception handling.
* valprint.c: Use C++ exception handling.
* valops.c: Use C++ exception handling.
* unittests/parse-connection-spec-selftests.c: Use C++ exception
handling.
* unittests/cli-utils-selftests.c: Use C++ exception handling.
* typeprint.c: Use C++ exception handling.
* tui/tui.c: Use C++ exception handling.
* tracefile-tfile.c: Use C++ exception handling.
* top.c: Use C++ exception handling.
* thread.c: Use C++ exception handling.
* target.c: Use C++ exception handling.
* symmisc.c: Use C++ exception handling.
* symfile-mem.c: Use C++ exception handling.
* stack.c: Use C++ exception handling.
* sparc64-linux-tdep.c: Use C++ exception handling.
* solib.c: Use C++ exception handling.
* solib-svr4.c: Use C++ exception handling.
* solib-spu.c: Use C++ exception handling.
* solib-frv.c: Use C++ exception handling.
* solib-dsbt.c: Use C++ exception handling.
* selftest-arch.c: Use C++ exception handling.
* s390-tdep.c: Use C++ exception handling.
* rust-lang.c: Use C++ exception handling.
* rust-exp.y: Use C++ exception handling.
* rs6000-tdep.c: Use C++ exception handling.
* rs6000-aix-tdep.c: Use C++ exception handling.
* riscv-tdep.c: Use C++ exception handling.
* remote.c: Use C++ exception handling.
* remote-fileio.c: Use C++ exception handling.
* record-full.c: Use C++ exception handling.
* record-btrace.c: Use C++ exception handling.
* python/python.c: Use C++ exception handling.
* python/py-value.c: Use C++ exception handling.
* python/py-utils.c: Use C++ exception handling.
* python/py-unwind.c: Use C++ exception handling.
* python/py-type.c: Use C++ exception handling.
* python/py-symbol.c: Use C++ exception handling.
* python/py-record.c: Use C++ exception handling.
* python/py-record-btrace.c: Use C++ exception handling.
* python/py-progspace.c: Use C++ exception handling.
* python/py-prettyprint.c: Use C++ exception handling.
* python/py-param.c: Use C++ exception handling.
* python/py-objfile.c: Use C++ exception handling.
* python/py-linetable.c: Use C++ exception handling.
* python/py-lazy-string.c: Use C++ exception handling.
* python/py-infthread.c: Use C++ exception handling.
* python/py-inferior.c: Use C++ exception handling.
* python/py-gdb-readline.c: Use C++ exception handling.
* python/py-framefilter.c: Use C++ exception handling.
* python/py-frame.c: Use C++ exception handling.
* python/py-finishbreakpoint.c: Use C++ exception handling.
* python/py-cmd.c: Use C++ exception handling.
* python/py-breakpoint.c: Use C++ exception handling.
* python/py-arch.c: Use C++ exception handling.
* printcmd.c: Use C++ exception handling.
* ppc-linux-tdep.c: Use C++ exception handling.
* parse.c: Use C++ exception handling.
* p-valprint.c: Use C++ exception handling.
* objc-lang.c: Use C++ exception handling.
* mi/mi-main.c: Use C++ exception handling.
* mi/mi-interp.c: Use C++ exception handling.
* mi/mi-cmd-stack.c: Use C++ exception handling.
* mi/mi-cmd-break.c: Use C++ exception handling.
* main.c: Use C++ exception handling.
* linux-thread-db.c: Use C++ exception handling.
* linux-tdep.c: Use C++ exception handling.
* linux-nat.c: Use C++ exception handling.
* linux-fork.c: Use C++ exception handling.
* linespec.c: Use C++ exception handling.
* language.c: Use C++ exception handling.
* jit.c: Use C++ exception handling.
* infrun.c: Use C++ exception handling.
* infcmd.c: Use C++ exception handling.
* infcall.c: Use C++ exception handling.
* inf-loop.c: Use C++ exception handling.
* i386-tdep.c: Use C++ exception handling.
* i386-linux-tdep.c: Use C++ exception handling.
* guile/scm-value.c: Use C++ exception handling.
* guile/scm-type.c: Use C++ exception handling.
* guile/scm-symtab.c: Use C++ exception handling.
* guile/scm-symbol.c: Use C++ exception handling.
* guile/scm-pretty-print.c: Use C++ exception handling.
* guile/scm-ports.c: Use C++ exception handling.
* guile/scm-param.c: Use C++ exception handling.
* guile/scm-math.c: Use C++ exception handling.
* guile/scm-lazy-string.c: Use C++ exception handling.
* guile/scm-frame.c: Use C++ exception handling.
* guile/scm-disasm.c: Use C++ exception handling.
* guile/scm-cmd.c: Use C++ exception handling.
* guile/scm-breakpoint.c: Use C++ exception handling.
* guile/scm-block.c: Use C++ exception handling.
* guile/guile-internal.h: Use C++ exception handling.
* gnu-v3-abi.c: Use C++ exception handling.
* gdbtypes.c: Use C++ exception handling.
* frame.c: Use C++ exception handling.
* frame-unwind.c: Use C++ exception handling.
* fbsd-tdep.c: Use C++ exception handling.
* f-valprint.c: Use C++ exception handling.
* exec.c: Use C++ exception handling.
* event-top.c: Use C++ exception handling.
* event-loop.c: Use C++ exception handling.
* eval.c: Use C++ exception handling.
* dwarf2read.c: Use C++ exception handling.
* dwarf2loc.c: Use C++ exception handling.
* dwarf2-frame.c: Use C++ exception handling.
* dwarf2-frame-tailcall.c: Use C++ exception handling.
* dwarf-index-write.c: Use C++ exception handling.
* dwarf-index-cache.c: Use C++ exception handling.
* dtrace-probe.c: Use C++ exception handling.
* disasm-selftests.c: Use C++ exception handling.
* darwin-nat.c: Use C++ exception handling.
* cp-valprint.c: Use C++ exception handling.
* cp-support.c: Use C++ exception handling.
* cp-abi.c: Use C++ exception handling.
* corelow.c: Use C++ exception handling.
* completer.c: Use C++ exception handling.
* compile/compile-object-run.c: Use C++ exception handling.
* compile/compile-object-load.c: Use C++ exception handling.
* compile/compile-cplus-symbols.c: Use C++ exception handling.
* compile/compile-c-symbols.c: Use C++ exception handling.
* common/selftest.c: Use C++ exception handling.
* common/new-op.c: Use C++ exception handling.
* cli/cli-script.c: Use C++ exception handling.
* cli/cli-interp.c: Use C++ exception handling.
* cli/cli-cmds.c: Use C++ exception handling.
* c-varobj.c: Use C++ exception handling.
* btrace.c: Use C++ exception handling.
* breakpoint.c: Use C++ exception handling.
* break-catch-throw.c: Use C++ exception handling.
* arch-utils.c: Use C++ exception handling.
* amd64-tdep.c: Use C++ exception handling.
* ada-valprint.c: Use C++ exception handling.
* ada-typeprint.c: Use C++ exception handling.
* ada-lang.c: Use C++ exception handling.
* aarch64-tdep.c: Use C++ exception handling.
gdb/gdbserver/ChangeLog
2019-04-08 Tom Tromey <tom@tromey.com>
* server.c: Use C++ exception handling.
* linux-low.c: Use C++ exception handling.
* gdbreplay.c: Use C++ exception handling.
This series is revisit of Siddhesh Poyarekar's patch from back in
2012. The last status on the patch is in the following gdb-patches
thread:
https://sourceware.org/ml/gdb-patches/2012-08/msg00562.html
It appears that Tom approved the patch, but Jan had some issues
with a compiler error that made the test fail on -m32 test runs.
He wrote up a hand-tweaked .S file to deal with it. Siddesh said
he would update tests. Then nothing.
Siddesh and Jan have both moved on since.
The patch originally required a large precursor patch to work.
I have whittled this down to/rewritten the bare minimum, and this
first patch is the result, changing the type of TYPE_LENGTH
to ULONGEST from unsigned int.
The majority of the changes involve changing printf format
strings to use %s and pulongest instead of %d.
gdb/ChangeLog:
* ada-lang.c (ada_template_to_fixed_record_type_1): Use
%s/pulongest for TYPE_LENGTH instead of %d in format
strings.
* ada-typerint.c (ada_print_type): Likewise.
* amd64-windows-tdep.c (amd64_windows_store_arg_in_reg): Likewise.
* compile/compile-c-support.c (generate_register_struct): Likewise.
* gdbtypes.c (recursive_dump_type): Likewise.
* gdbtypes.h (struct type) <length>: Change type to ULONGEST.
* m2-typeprint.c (m2_array): Use %s/pulongest for TYPE_LENGTH
instead of %d in format strings.
* riscv-tdep.c (riscv_type_alignment): Cast second argument
to std::min to ULONGEST.
* symmisc.c (print_symbol): Use %s/pulongest for TYPE_LENGTH
instead of %d in format strings.
* tracepoint.c (info_scope_command): Likewise.
* typeprint.c (print_offset_data::update)
(print_offset_data::finish): Likewise.
* xtensa-tdep.c (xtensa_store_return_value)
(xtensa_push_dummy_call): Likewise.
I noticed that there are still many places referring to non-const
blocks. This constifies all the remaining ones that I found that
could be constified.
In a few spots, this search found unused variables or fields. I
removed these. I've also removed some unnecessary casts to
"struct block *".
gdb/ChangeLog
2019-03-24 Tom Tromey <tom@tromey.com>
* c-exp.y (typebase): Remove casts.
* gdbtypes.c (lookup_unsigned_typename, )
(lookup_signed_typename): Remove cast.
* eval.c (parse_to_comma_and_eval): Remove cast.
* parse.c (write_dollar_variable): Remove cast.
* block.h (struct block) <superblock>: Now const.
* symfile-debug.c (debug_qf_map_matching_symbols): Update.
* psymtab.c (psym_map_matching_symbols): Make "block" const.
(map_block): Make "block" const.
* symfile.h (struct quick_symbol_functions)
<map_matching_symbols>: Constify block argument to "callback".
* symtab.c (basic_lookup_transparent_type_quick): Make "block"
const.
(find_pc_sect_compunit_symtab): Make "b" const.
(find_symbol_at_address): Likewise.
(search_symbols): Likewise.
* dwarf2read.c (dw2_lookup_symbol): Make "block" const.
(dw2_debug_names_lookup_symbol): Likewise.
(dw2_map_matching_symbols): Update.
* p-valprint.c (pascal_val_print): Remove "block".
* ada-lang.c (ada_add_global_exceptions): Make "b" const.
(aux_add_nonlocal_symbols): Make "block" const.
(resolve_subexp): Remove cast.
* linespec.c (iterate_over_all_matching_symtabs): Make "block"
const.
(iterate_over_file_blocks): Likewise.
* f-exp.y (%union) <bval>: Remove.
* coffread.c (patch_opaque_types): Make "b" const.
* spu-tdep.c (spu_catch_start): Make "block" const.
* c-valprint.c (print_unpacked_pointer): Remove "block".
* symmisc.c (dump_symtab_1): Make "b" const.
(block_depth): Make "block" const.
* d-exp.y (%union) <bval>: Remove.
* cp-support.h (cp_lookup_rtti_type): Update.
* cp-support.c (cp_lookup_rtti_type): Make "block" const.
* psymtab.c (psym_lookup_symbol): Make "block" const.
(maintenance_check_psymtabs): Make "b" const.
* python/py-framefilter.c (extract_sym): Make "sym_block" const.
(enumerate_locals, enumerate_args): Update.
* python/py-symtab.c (stpy_global_block): Make "block" const.
(stpy_static_block): Likewise.
* inline-frame.c (block_starting_point_at): Make "new_block"
const.
* block.c (find_block_in_blockvector): Make return type const.
(blockvector_for_pc_sect): Make "b" const.
(find_block_in_blockvector): Make "b" const.
lookup_struct_elt is a new function which returns a tuple of
information about a component of a structure or union. The returned
tuple contains a pointer to the struct field object for the component
as well as a bit offset of that field within the structure. If the
field names a field in an anonymous substructure, the offset is the
"global" offset relative to the original structure type. If noerr is
set, then the returned tuple will set the field pointer to NULL to
indicate a missing component rather than throwing an error.
lookup_struct_elt_type is now reimplemented in terms of this new
function. It simply returns the type of the returned field.
gdb/ChangeLog:
* gdbtypes.c (lookup_struct_elt): New function.
(lookup_struct_elt_type): Reimplement via lookup_struct_elt.
* gdbtypes.h (struct struct_elt): New type.
(lookup_struct_elt): New prototype.
Update the comment above the function to reflect the code removal and
document the existing behavior.
gdb/ChangeLog:
* gdbtypes.c (lookup_struct_elt_type): Update comment and
remove disabled code block.
We return INCOMPATIBLE_TYPE_BADNESS for all these type codes, so we might as
well just let them go to the default case.
Incidentally, this patch also makes this false positive error go away when
compiling with gcc (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0, default compiler on
Ubuntu 18.04.
CXX gdbtypes.o
/home/smarchi/src/binutils-gdb/gdb/gdbtypes.c: In function ‘rank rank_one_type(type*, type*, value*)’:
/home/smarchi/src/binutils-gdb/gdb/gdbtypes.c:4259:1: error: control reaches end of non-void function [-Werror=return-type]
}
^
gdb/ChangeLog:
* gdbtypes.c (rank_one_type): Remove unnecessary cases from switch.
In 'type_align' when computing the alignment of a structure we should
not consider the alignment of static structure members, these are
usually stored outside of the structure and therefore don't have any
impact on the structures alignment requirements.
I've extended the existing alignment calculating test to compile in
both C and C++ now so that we can create structures with static
members.
gdb/ChangeLog:
* gdbtypes.c (type_align): Don't consider static members when
computing structure alignment.
gdb/testsuite/ChangeLog:
* gdb.base/align.exp: Extend to compile in both C and C++, and add
tests for structs with static members.
This commit restructures the relationship between the type_align
function and the gdbarch_type_align method.
The problem being addressed with this commit is this; previously the
type_align function was structured so that for "basic" types (int,
float, etc) the gdbarch_type_align hook was called, which for
"compound" types (arrays, structs, etc) the common type_align code has
a fixed method for how to extract a "basic" type and would then call
itself on that "basic" type.
The problem is that if an architecture wants to modify the alignment
rules for a "compound" type then this is not currently possible.
In the revised structure, all types pass through the
gdbarch_type_align method. If this method returns 0 then this
indicates that the architecture has no special rules for this type,
and GDB should apply the default rules for alignment. However, the
architecture is free to provide an alignment for any type, both
"basic" and "compound".
After this commit the default alignment rules now all live in the
type_align function, the default_type_align only ever returns 0,
meaning apply the default rules.
I've updated the 3 targets (arc, i386, and nios2) that already
override the gdbarch_type_align method to fit the new scheme.
Tested on X86-64/GNU Linux with no regressions.
gdb/ChangeLog:
* arc-tdep.c (arc_type_align): Provide alignment for basic types,
return 0 for other types.
* arch-utils.c (default_type_align): Always return 0.
* gdbarch.h: Regenerate.
* gdbarch.sh (type_align): Extend comment.
* gdbtypes.c (type_align): Add additional comments, always call
gdbarch_type_align before applying the default rules.
* i386-tdep.c (i386_type_align): Return 0 as the default rule,
generic code will then apply a suitable default.
* nios2-tdep.c (nios2_type_align): Provide alignment for basic
types, return 0 for other types.
The code in type_align (gdbtypes.c) currently hard-codes the rules for
aligning method and member pointers. It would seem better to forward
these types through the gdbarch hook, so that an architecture could
override the alignment of these types if needed.
Only 3 architectures currently override the gdbarch alignment hook,
these are arc, i386, and nio2.
For arc and nios the alignment rules are that alignment is the minimum
of 4-bytes and the type length. As pointers are 4-bytes on these
targets, then (assuming method and members pointers are also 4-bytes)
there should be no change to the alignment after this patch.
For i386 the gdbarch alignment hook overrides for some INT and FLOAT
types only. For method and member pointers we align on the type size
still, so there should be no change to the alignment after this patch.
I tested this on x86-64 GNU Linux with no regressions.
gdb/ChangeLog:
* gdbtypes.c (type_align): Allow alignment of TYPE_CODE_METHODPTR
and TYPE_CODE_MEMBERPTR to be overridden by the gdbarch.
