34877895ca
- 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
479 lines
15 KiB
C
479 lines
15 KiB
C
/* Pascal language support routines for GDB, the GNU debugger.
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Copyright (C) 2000-2019 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* This file is derived from c-lang.c */
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#include "defs.h"
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#include "symtab.h"
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#include "gdbtypes.h"
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#include "expression.h"
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#include "parser-defs.h"
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#include "language.h"
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#include "varobj.h"
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#include "p-lang.h"
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#include "valprint.h"
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#include "value.h"
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#include <ctype.h>
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#include "c-lang.h"
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#include "gdbarch.h"
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#include "cli/cli-style.h"
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/* All GPC versions until now (2007-09-27) also define a symbol called
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'_p_initialize'. Check for the presence of this symbol first. */
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static const char GPC_P_INITIALIZE[] = "_p_initialize";
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/* The name of the symbol that GPC uses as the name of the main
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procedure (since version 20050212). */
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static const char GPC_MAIN_PROGRAM_NAME_1[] = "_p__M0_main_program";
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/* Older versions of GPC (versions older than 20050212) were using
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a different name for the main procedure. */
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static const char GPC_MAIN_PROGRAM_NAME_2[] = "pascal_main_program";
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/* Function returning the special symbol name used
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by GPC for the main procedure in the main program
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if it is found in minimal symbol list.
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This function tries to find minimal symbols generated by GPC
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so that it finds the even if the program was compiled
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without debugging information.
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According to information supplied by Waldeck Hebisch,
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this should work for all versions posterior to June 2000. */
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const char *
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pascal_main_name (void)
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{
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struct bound_minimal_symbol msym;
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msym = lookup_minimal_symbol (GPC_P_INITIALIZE, NULL, NULL);
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/* If '_p_initialize' was not found, the main program is likely not
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written in Pascal. */
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if (msym.minsym == NULL)
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return NULL;
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msym = lookup_minimal_symbol (GPC_MAIN_PROGRAM_NAME_1, NULL, NULL);
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if (msym.minsym != NULL)
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{
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return GPC_MAIN_PROGRAM_NAME_1;
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}
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msym = lookup_minimal_symbol (GPC_MAIN_PROGRAM_NAME_2, NULL, NULL);
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if (msym.minsym != NULL)
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{
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return GPC_MAIN_PROGRAM_NAME_2;
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}
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/* No known entry procedure found, the main program is probably
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not compiled with GPC. */
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return NULL;
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}
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/* Determines if type TYPE is a pascal string type.
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Returns a positive value if the type is a known pascal string type.
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This function is used by p-valprint.c code to allow better string display.
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If it is a pascal string type, then it also sets info needed
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to get the length and the data of the string
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length_pos, length_size and string_pos are given in bytes.
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char_size gives the element size in bytes.
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FIXME: if the position or the size of these fields
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are not multiple of TARGET_CHAR_BIT then the results are wrong
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but this does not happen for Free Pascal nor for GPC. */
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int
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is_pascal_string_type (struct type *type,int *length_pos,
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int *length_size, int *string_pos,
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struct type **char_type,
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const char **arrayname)
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{
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if (type != NULL && TYPE_CODE (type) == TYPE_CODE_STRUCT)
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{
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/* Old Borland type pascal strings from Free Pascal Compiler. */
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/* Two fields: length and st. */
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if (TYPE_NFIELDS (type) == 2
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&& TYPE_FIELD_NAME (type, 0)
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&& strcmp (TYPE_FIELD_NAME (type, 0), "length") == 0
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&& TYPE_FIELD_NAME (type, 1)
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&& strcmp (TYPE_FIELD_NAME (type, 1), "st") == 0)
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{
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if (length_pos)
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*length_pos = TYPE_FIELD_BITPOS (type, 0) / TARGET_CHAR_BIT;
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if (length_size)
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*length_size = TYPE_LENGTH (TYPE_FIELD_TYPE (type, 0));
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if (string_pos)
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*string_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT;
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if (char_type)
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*char_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 1));
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if (arrayname)
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*arrayname = TYPE_FIELD_NAME (type, 1);
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return 2;
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};
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/* GNU pascal strings. */
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/* Three fields: Capacity, length and schema$ or _p_schema. */
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if (TYPE_NFIELDS (type) == 3
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&& TYPE_FIELD_NAME (type, 0)
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&& strcmp (TYPE_FIELD_NAME (type, 0), "Capacity") == 0
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&& TYPE_FIELD_NAME (type, 1)
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&& strcmp (TYPE_FIELD_NAME (type, 1), "length") == 0)
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{
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if (length_pos)
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*length_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT;
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if (length_size)
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*length_size = TYPE_LENGTH (TYPE_FIELD_TYPE (type, 1));
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if (string_pos)
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*string_pos = TYPE_FIELD_BITPOS (type, 2) / TARGET_CHAR_BIT;
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/* FIXME: how can I detect wide chars in GPC ?? */
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if (char_type)
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{
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*char_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 2));
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if (TYPE_CODE (*char_type) == TYPE_CODE_ARRAY)
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*char_type = TYPE_TARGET_TYPE (*char_type);
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}
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if (arrayname)
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*arrayname = TYPE_FIELD_NAME (type, 2);
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return 3;
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};
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}
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return 0;
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}
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/* This is a wrapper around IS_PASCAL_STRING_TYPE that returns true if TYPE
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is a string. */
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static bool
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pascal_is_string_type_p (struct type *type)
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{
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return is_pascal_string_type (type, nullptr, nullptr, nullptr,
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nullptr, nullptr) > 0;
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}
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static void pascal_one_char (int, struct ui_file *, int *);
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/* Print the character C on STREAM as part of the contents of a literal
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string.
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In_quotes is reset to 0 if a char is written with #4 notation. */
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static void
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pascal_one_char (int c, struct ui_file *stream, int *in_quotes)
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{
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if (c == '\'' || ((unsigned int) c <= 0xff && (PRINT_LITERAL_FORM (c))))
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{
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if (!(*in_quotes))
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fputs_filtered ("'", stream);
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*in_quotes = 1;
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if (c == '\'')
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{
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fputs_filtered ("''", stream);
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}
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else
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fprintf_filtered (stream, "%c", c);
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}
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else
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{
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if (*in_quotes)
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fputs_filtered ("'", stream);
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*in_quotes = 0;
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fprintf_filtered (stream, "#%d", (unsigned int) c);
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}
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}
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static void pascal_emit_char (int c, struct type *type,
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struct ui_file *stream, int quoter);
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/* Print the character C on STREAM as part of the contents of a literal
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string whose delimiter is QUOTER. Note that that format for printing
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characters and strings is language specific. */
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static void
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pascal_emit_char (int c, struct type *type, struct ui_file *stream, int quoter)
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{
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int in_quotes = 0;
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pascal_one_char (c, stream, &in_quotes);
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if (in_quotes)
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fputs_filtered ("'", stream);
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}
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void
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pascal_printchar (int c, struct type *type, struct ui_file *stream)
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{
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int in_quotes = 0;
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pascal_one_char (c, stream, &in_quotes);
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if (in_quotes)
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fputs_filtered ("'", stream);
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}
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/* Print the character string STRING, printing at most LENGTH characters.
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Printing stops early if the number hits print_max; repeat counts
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are printed as appropriate. Print ellipses at the end if we
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had to stop before printing LENGTH characters, or if FORCE_ELLIPSES. */
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void
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pascal_printstr (struct ui_file *stream, struct type *type,
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const gdb_byte *string, unsigned int length,
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const char *encoding, int force_ellipses,
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const struct value_print_options *options)
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{
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enum bfd_endian byte_order = type_byte_order (type);
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unsigned int i;
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unsigned int things_printed = 0;
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int in_quotes = 0;
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int need_comma = 0;
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int width;
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/* Preserve TYPE's original type, just set its LENGTH. */
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check_typedef (type);
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width = TYPE_LENGTH (type);
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/* If the string was not truncated due to `set print elements', and
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the last byte of it is a null, we don't print that, in traditional C
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style. */
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if ((!force_ellipses) && length > 0
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&& extract_unsigned_integer (string + (length - 1) * width, width,
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byte_order) == 0)
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length--;
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if (length == 0)
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{
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fputs_filtered ("''", stream);
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return;
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}
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for (i = 0; i < length && things_printed < options->print_max; ++i)
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{
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/* Position of the character we are examining
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to see whether it is repeated. */
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unsigned int rep1;
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/* Number of repetitions we have detected so far. */
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unsigned int reps;
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unsigned long int current_char;
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QUIT;
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if (need_comma)
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{
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fputs_filtered (", ", stream);
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need_comma = 0;
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}
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current_char = extract_unsigned_integer (string + i * width, width,
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byte_order);
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rep1 = i + 1;
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reps = 1;
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while (rep1 < length
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&& extract_unsigned_integer (string + rep1 * width, width,
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byte_order) == current_char)
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{
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++rep1;
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++reps;
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}
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if (reps > options->repeat_count_threshold)
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{
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if (in_quotes)
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{
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fputs_filtered ("', ", stream);
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in_quotes = 0;
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}
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pascal_printchar (current_char, type, stream);
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fprintf_filtered (stream, " %p[<repeats %u times>%p]",
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metadata_style.style ().ptr (),
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reps, nullptr);
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i = rep1 - 1;
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things_printed += options->repeat_count_threshold;
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need_comma = 1;
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}
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else
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{
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if ((!in_quotes) && (PRINT_LITERAL_FORM (current_char)))
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{
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fputs_filtered ("'", stream);
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in_quotes = 1;
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}
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pascal_one_char (current_char, stream, &in_quotes);
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++things_printed;
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}
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}
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/* Terminate the quotes if necessary. */
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if (in_quotes)
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fputs_filtered ("'", stream);
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if (force_ellipses || i < length)
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fputs_filtered ("...", stream);
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}
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/* Table mapping opcodes into strings for printing operators
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and precedences of the operators. */
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const struct op_print pascal_op_print_tab[] =
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{
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{",", BINOP_COMMA, PREC_COMMA, 0},
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{":=", BINOP_ASSIGN, PREC_ASSIGN, 1},
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{"or", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0},
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{"xor", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0},
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{"and", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0},
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{"=", BINOP_EQUAL, PREC_EQUAL, 0},
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{"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0},
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{"<=", BINOP_LEQ, PREC_ORDER, 0},
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{">=", BINOP_GEQ, PREC_ORDER, 0},
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{">", BINOP_GTR, PREC_ORDER, 0},
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{"<", BINOP_LESS, PREC_ORDER, 0},
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{"shr", BINOP_RSH, PREC_SHIFT, 0},
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{"shl", BINOP_LSH, PREC_SHIFT, 0},
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{"+", BINOP_ADD, PREC_ADD, 0},
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{"-", BINOP_SUB, PREC_ADD, 0},
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{"*", BINOP_MUL, PREC_MUL, 0},
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{"/", BINOP_DIV, PREC_MUL, 0},
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{"div", BINOP_INTDIV, PREC_MUL, 0},
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{"mod", BINOP_REM, PREC_MUL, 0},
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{"@", BINOP_REPEAT, PREC_REPEAT, 0},
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{"-", UNOP_NEG, PREC_PREFIX, 0},
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{"not", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
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{"^", UNOP_IND, PREC_SUFFIX, 1},
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{"@", UNOP_ADDR, PREC_PREFIX, 0},
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{"sizeof", UNOP_SIZEOF, PREC_PREFIX, 0},
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{NULL, OP_NULL, PREC_PREFIX, 0}
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};
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enum pascal_primitive_types {
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pascal_primitive_type_int,
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pascal_primitive_type_long,
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pascal_primitive_type_short,
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pascal_primitive_type_char,
|
||
pascal_primitive_type_float,
|
||
pascal_primitive_type_double,
|
||
pascal_primitive_type_void,
|
||
pascal_primitive_type_long_long,
|
||
pascal_primitive_type_signed_char,
|
||
pascal_primitive_type_unsigned_char,
|
||
pascal_primitive_type_unsigned_short,
|
||
pascal_primitive_type_unsigned_int,
|
||
pascal_primitive_type_unsigned_long,
|
||
pascal_primitive_type_unsigned_long_long,
|
||
pascal_primitive_type_long_double,
|
||
pascal_primitive_type_complex,
|
||
pascal_primitive_type_double_complex,
|
||
nr_pascal_primitive_types
|
||
};
|
||
|
||
static void
|
||
pascal_language_arch_info (struct gdbarch *gdbarch,
|
||
struct language_arch_info *lai)
|
||
{
|
||
const struct builtin_type *builtin = builtin_type (gdbarch);
|
||
|
||
lai->string_char_type = builtin->builtin_char;
|
||
lai->primitive_type_vector
|
||
= GDBARCH_OBSTACK_CALLOC (gdbarch, nr_pascal_primitive_types + 1,
|
||
struct type *);
|
||
lai->primitive_type_vector [pascal_primitive_type_int]
|
||
= builtin->builtin_int;
|
||
lai->primitive_type_vector [pascal_primitive_type_long]
|
||
= builtin->builtin_long;
|
||
lai->primitive_type_vector [pascal_primitive_type_short]
|
||
= builtin->builtin_short;
|
||
lai->primitive_type_vector [pascal_primitive_type_char]
|
||
= builtin->builtin_char;
|
||
lai->primitive_type_vector [pascal_primitive_type_float]
|
||
= builtin->builtin_float;
|
||
lai->primitive_type_vector [pascal_primitive_type_double]
|
||
= builtin->builtin_double;
|
||
lai->primitive_type_vector [pascal_primitive_type_void]
|
||
= builtin->builtin_void;
|
||
lai->primitive_type_vector [pascal_primitive_type_long_long]
|
||
= builtin->builtin_long_long;
|
||
lai->primitive_type_vector [pascal_primitive_type_signed_char]
|
||
= builtin->builtin_signed_char;
|
||
lai->primitive_type_vector [pascal_primitive_type_unsigned_char]
|
||
= builtin->builtin_unsigned_char;
|
||
lai->primitive_type_vector [pascal_primitive_type_unsigned_short]
|
||
= builtin->builtin_unsigned_short;
|
||
lai->primitive_type_vector [pascal_primitive_type_unsigned_int]
|
||
= builtin->builtin_unsigned_int;
|
||
lai->primitive_type_vector [pascal_primitive_type_unsigned_long]
|
||
= builtin->builtin_unsigned_long;
|
||
lai->primitive_type_vector [pascal_primitive_type_unsigned_long_long]
|
||
= builtin->builtin_unsigned_long_long;
|
||
lai->primitive_type_vector [pascal_primitive_type_long_double]
|
||
= builtin->builtin_long_double;
|
||
lai->primitive_type_vector [pascal_primitive_type_complex]
|
||
= builtin->builtin_complex;
|
||
lai->primitive_type_vector [pascal_primitive_type_double_complex]
|
||
= builtin->builtin_double_complex;
|
||
|
||
lai->bool_type_symbol = "boolean";
|
||
lai->bool_type_default = builtin->builtin_bool;
|
||
}
|
||
|
||
static const char *p_extensions[] =
|
||
{
|
||
".pas", ".p", ".pp", NULL
|
||
};
|
||
|
||
extern const struct language_defn pascal_language_defn =
|
||
{
|
||
"pascal", /* Language name */
|
||
"Pascal",
|
||
language_pascal,
|
||
range_check_on,
|
||
case_sensitive_on,
|
||
array_row_major,
|
||
macro_expansion_no,
|
||
p_extensions,
|
||
&exp_descriptor_standard,
|
||
pascal_parse,
|
||
null_post_parser,
|
||
pascal_printchar, /* Print a character constant */
|
||
pascal_printstr, /* Function to print string constant */
|
||
pascal_emit_char, /* Print a single char */
|
||
pascal_print_type, /* Print a type using appropriate syntax */
|
||
pascal_print_typedef, /* Print a typedef using appropriate syntax */
|
||
pascal_val_print, /* Print a value using appropriate syntax */
|
||
pascal_value_print, /* Print a top-level value */
|
||
default_read_var_value, /* la_read_var_value */
|
||
NULL, /* Language specific skip_trampoline */
|
||
"this", /* name_of_this */
|
||
false, /* la_store_sym_names_in_linkage_form_p */
|
||
basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
|
||
basic_lookup_transparent_type,/* lookup_transparent_type */
|
||
NULL, /* Language specific symbol demangler */
|
||
NULL,
|
||
NULL, /* Language specific class_name_from_physname */
|
||
pascal_op_print_tab, /* expression operators for printing */
|
||
1, /* c-style arrays */
|
||
0, /* String lower bound */
|
||
default_word_break_characters,
|
||
default_collect_symbol_completion_matches,
|
||
pascal_language_arch_info,
|
||
default_print_array_index,
|
||
default_pass_by_reference,
|
||
c_watch_location_expression,
|
||
NULL, /* la_compare_symbol_for_completion */
|
||
iterate_over_symbols,
|
||
default_search_name_hash,
|
||
&default_varobj_ops,
|
||
NULL,
|
||
NULL,
|
||
pascal_is_string_type_p,
|
||
"{...}" /* la_struct_too_deep_ellipsis */
|
||
};
|