59cc4834e5
This patch fixes a known failure in gdb.ada/maint_with_ada.exp
(maintenance check-psymtabs). Another way to witness the same
issue is by considering the following Ada declarations...
type Wrapper is record
A : Integer;
end record;
u00045 : constant Wrapper := (A => 16#060287af#);
pragma Export (C, u00045, "symada__cS");
... which declares a variable name "u00045" but with a linkage
name which is "symada__cS". This variable is a record with one
component, the Ada equivalent of a struct with one field in C.
Trying to print that variable's value currently yields:
(gdb) p /x <symada__cS>
'symada(char, signed)' has unknown type; cast it to its declared type
This indicates that GDB was only able to find the minimal symbol,
but not the full symbol. The expected output is:
(gdb) print /x <symada__cS>
$1 = (a => 0x60287af)
The error message gives a hint about what's happening: We processed
the symbol through gdb_demangle, which in the case of this particular
symbol name, ends up matching the C++ naming scheme. As a result,
the demangler transforms our symbol name into 'symada(char, signed)',
thus breaking Ada lookups.
This patch fixes the issue by first introducing a new language_defn
attribute called la_store_sym_names_in_linkage_form_p, which is a boolean
to be set to true for the few languages that do not want their symbols
to have their names stored in demangled form, and false otherwise.
We then use this language attribute to skip the call to gdb_demangle
for all languages whose la_store_sym_names_in_linkage_form_p is true.
In terms of the selection of languages for which the new attribute
is set to true, the selection errs on the side of preserving the
existing behavior, and only changes the behavior for the languages
where we are certain storing symbol names in demangling form is not
needed. It is conceivable that other languages might be in the same
situation, but I not knowing in detail the symbol name enconding
strategy, I decided to play it safe and let other language maintainers
potentially adjust their language if it makes sense to do so.
gdb/ChangeLog:
PR gdb/22670
* dwarf2read.c (dwarf2_physname): Do not return the demangled
symbol name if the CU's language stores symbol names in linkage
format.
* language.h (struct language_defn)
<la_store_sym_names_in_linkage_form_p>: New field. Adjust
all instances of this struct.
gdb/testsuite/ChangeLog:
* gdb.ada/maint_with_ada.exp: Remove PR gdb/22670 setup_kfail.
* gdb.ada/notcplusplus: New testcase.
* gdb.base/c-linkage-name.c: New file.
* gdb.base/c-linkage-name.exp: New testcase.
Tested on x86_64-linux.
This also passes AdaCore's internal GDB testsuite.
444 lines
13 KiB
C
444 lines
13 KiB
C
/* Modula 2 language support routines for GDB, the GNU debugger.
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Copyright (C) 1992-2018 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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#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 "m2-lang.h"
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#include "c-lang.h"
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#include "valprint.h"
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static void m2_printchar (int, struct type *, struct ui_file *);
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static void m2_emit_char (int, struct type *, 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 whose delimiter is QUOTER. Note that that format for printing
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characters and strings is language specific.
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FIXME: This is a copy of the same function from c-exp.y. It should
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be replaced with a true Modula version. */
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static void
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m2_emit_char (int c, struct type *type, struct ui_file *stream, int quoter)
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{
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c &= 0xFF; /* Avoid sign bit follies. */
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if (PRINT_LITERAL_FORM (c))
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{
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if (c == '\\' || c == quoter)
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{
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fputs_filtered ("\\", stream);
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}
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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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switch (c)
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{
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case '\n':
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fputs_filtered ("\\n", stream);
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break;
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case '\b':
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fputs_filtered ("\\b", stream);
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break;
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case '\t':
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fputs_filtered ("\\t", stream);
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break;
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case '\f':
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fputs_filtered ("\\f", stream);
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break;
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case '\r':
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fputs_filtered ("\\r", stream);
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break;
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case '\033':
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fputs_filtered ("\\e", stream);
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break;
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case '\007':
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fputs_filtered ("\\a", stream);
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break;
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default:
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fprintf_filtered (stream, "\\%.3o", (unsigned int) c);
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break;
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}
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}
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}
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/* FIXME: This is a copy of the same function from c-exp.y. It should
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be replaced with a true Modula version. */
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static void
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m2_printchar (int c, struct type *type, struct ui_file *stream)
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{
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fputs_filtered ("'", stream);
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LA_EMIT_CHAR (c, type, stream, '\'');
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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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FIXME: This is a copy of the same function from c-exp.y. It should
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be replaced with a true Modula version. */
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static void
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m2_printstr (struct ui_file *stream, struct type *type, const gdb_byte *string,
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unsigned int length, const char *encoding, int force_ellipses,
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const struct value_print_options *options)
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{
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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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if (length == 0)
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{
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fputs_filtered ("\"\"", gdb_stdout);
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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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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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rep1 = i + 1;
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reps = 1;
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while (rep1 < length && string[rep1] == string[i])
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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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m2_printchar (string[i], type, stream);
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fprintf_filtered (stream, " <repeats %u times>", reps);
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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)
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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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LA_EMIT_CHAR (string[i], type, stream, '"');
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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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static struct value *
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evaluate_subexp_modula2 (struct type *expect_type, struct expression *exp,
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int *pos, enum noside noside)
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{
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enum exp_opcode op = exp->elts[*pos].opcode;
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struct value *arg1;
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struct value *arg2;
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struct type *type;
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switch (op)
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{
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case UNOP_HIGH:
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(*pos)++;
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arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
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if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
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return arg1;
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else
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{
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arg1 = coerce_ref (arg1);
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type = check_typedef (value_type (arg1));
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if (m2_is_unbounded_array (type))
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{
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struct value *temp = arg1;
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type = TYPE_FIELD_TYPE (type, 1);
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/* i18n: Do not translate the "_m2_high" part! */
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arg1 = value_struct_elt (&temp, NULL, "_m2_high", NULL,
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_("unbounded structure "
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"missing _m2_high field"));
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if (value_type (arg1) != type)
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arg1 = value_cast (type, arg1);
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}
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}
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return arg1;
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case BINOP_SUBSCRIPT:
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(*pos)++;
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arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
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arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
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if (noside == EVAL_SKIP)
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goto nosideret;
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/* If the user attempts to subscript something that is not an
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array or pointer type (like a plain int variable for example),
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then report this as an error. */
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arg1 = coerce_ref (arg1);
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type = check_typedef (value_type (arg1));
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if (m2_is_unbounded_array (type))
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{
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struct value *temp = arg1;
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type = TYPE_FIELD_TYPE (type, 0);
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if (type == NULL || (TYPE_CODE (type) != TYPE_CODE_PTR))
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{
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warning (_("internal error: unbounded "
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"array structure is unknown"));
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return evaluate_subexp_standard (expect_type, exp, pos, noside);
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}
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/* i18n: Do not translate the "_m2_contents" part! */
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arg1 = value_struct_elt (&temp, NULL, "_m2_contents", NULL,
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_("unbounded structure "
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"missing _m2_contents field"));
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if (value_type (arg1) != type)
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arg1 = value_cast (type, arg1);
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check_typedef (value_type (arg1));
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return value_ind (value_ptradd (arg1, value_as_long (arg2)));
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}
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else
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if (TYPE_CODE (type) != TYPE_CODE_ARRAY)
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{
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if (TYPE_NAME (type))
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error (_("cannot subscript something of type `%s'"),
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TYPE_NAME (type));
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else
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error (_("cannot subscript requested type"));
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}
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if (noside == EVAL_AVOID_SIDE_EFFECTS)
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return value_zero (TYPE_TARGET_TYPE (type), VALUE_LVAL (arg1));
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else
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return value_subscript (arg1, value_as_long (arg2));
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default:
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return evaluate_subexp_standard (expect_type, exp, pos, noside);
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}
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nosideret:
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return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1);
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}
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/* Table of operators and their precedences for printing expressions. */
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static const struct op_print m2_op_print_tab[] =
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{
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{"+", BINOP_ADD, PREC_ADD, 0},
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{"+", UNOP_PLUS, PREC_PREFIX, 0},
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{"-", BINOP_SUB, PREC_ADD, 0},
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{"-", UNOP_NEG, PREC_PREFIX, 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_ASSIGN, PREC_ASSIGN, 1},
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{"OR", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0},
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{"AND", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0},
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{"NOT", UNOP_LOGICAL_NOT, PREC_PREFIX, 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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{"^", UNOP_IND, PREC_PREFIX, 0},
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{"@", BINOP_REPEAT, PREC_REPEAT, 0},
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{"CAP", UNOP_CAP, PREC_BUILTIN_FUNCTION, 0},
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{"CHR", UNOP_CHR, PREC_BUILTIN_FUNCTION, 0},
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{"ORD", UNOP_ORD, PREC_BUILTIN_FUNCTION, 0},
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{"FLOAT", UNOP_FLOAT, PREC_BUILTIN_FUNCTION, 0},
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{"HIGH", UNOP_HIGH, PREC_BUILTIN_FUNCTION, 0},
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{"MAX", UNOP_MAX, PREC_BUILTIN_FUNCTION, 0},
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{"MIN", UNOP_MIN, PREC_BUILTIN_FUNCTION, 0},
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{"ODD", UNOP_ODD, PREC_BUILTIN_FUNCTION, 0},
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{"TRUNC", UNOP_TRUNC, PREC_BUILTIN_FUNCTION, 0},
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{NULL, OP_NULL, PREC_BUILTIN_FUNCTION, 0}
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};
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/* The built-in types of Modula-2. */
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enum m2_primitive_types {
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m2_primitive_type_char,
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m2_primitive_type_int,
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m2_primitive_type_card,
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m2_primitive_type_real,
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m2_primitive_type_bool,
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nr_m2_primitive_types
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};
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static void
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m2_language_arch_info (struct gdbarch *gdbarch,
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struct language_arch_info *lai)
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{
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const struct builtin_m2_type *builtin = builtin_m2_type (gdbarch);
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lai->string_char_type = builtin->builtin_char;
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lai->primitive_type_vector
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= GDBARCH_OBSTACK_CALLOC (gdbarch, nr_m2_primitive_types + 1,
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struct type *);
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lai->primitive_type_vector [m2_primitive_type_char]
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= builtin->builtin_char;
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lai->primitive_type_vector [m2_primitive_type_int]
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= builtin->builtin_int;
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lai->primitive_type_vector [m2_primitive_type_card]
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= builtin->builtin_card;
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lai->primitive_type_vector [m2_primitive_type_real]
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= builtin->builtin_real;
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lai->primitive_type_vector [m2_primitive_type_bool]
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= builtin->builtin_bool;
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lai->bool_type_symbol = "BOOLEAN";
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lai->bool_type_default = builtin->builtin_bool;
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}
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const struct exp_descriptor exp_descriptor_modula2 =
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{
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print_subexp_standard,
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operator_length_standard,
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operator_check_standard,
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op_name_standard,
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dump_subexp_body_standard,
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evaluate_subexp_modula2
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};
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extern const struct language_defn m2_language_defn =
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{
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"modula-2",
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"Modula-2",
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language_m2,
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range_check_on,
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case_sensitive_on,
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array_row_major,
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macro_expansion_no,
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NULL,
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&exp_descriptor_modula2,
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m2_parse, /* parser */
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m2_yyerror, /* parser error function */
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null_post_parser,
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m2_printchar, /* Print character constant */
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m2_printstr, /* function to print string constant */
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m2_emit_char, /* Function to print a single character */
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m2_print_type, /* Print a type using appropriate syntax */
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m2_print_typedef, /* Print a typedef using appropriate syntax */
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m2_val_print, /* Print a value using appropriate syntax */
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c_value_print, /* Print a top-level value */
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default_read_var_value, /* la_read_var_value */
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NULL, /* Language specific skip_trampoline */
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NULL, /* name_of_this */
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false, /* la_store_sym_names_in_linkage_form_p */
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basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
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basic_lookup_transparent_type,/* lookup_transparent_type */
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NULL, /* Language specific symbol demangler */
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NULL,
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NULL, /* Language specific
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class_name_from_physname */
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m2_op_print_tab, /* expression operators for printing */
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0, /* arrays are first-class (not c-style) */
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0, /* String lower bound */
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default_word_break_characters,
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default_collect_symbol_completion_matches,
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m2_language_arch_info,
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default_print_array_index,
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default_pass_by_reference,
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default_get_string,
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c_watch_location_expression,
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NULL, /* la_get_symbol_name_matcher */
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iterate_over_symbols,
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default_search_name_hash,
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&default_varobj_ops,
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NULL,
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NULL,
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LANG_MAGIC
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};
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static void *
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build_m2_types (struct gdbarch *gdbarch)
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{
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struct builtin_m2_type *builtin_m2_type
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= GDBARCH_OBSTACK_ZALLOC (gdbarch, struct builtin_m2_type);
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/* Modula-2 "pervasive" types. NOTE: these can be redefined!!! */
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builtin_m2_type->builtin_int
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= arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 0, "INTEGER");
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builtin_m2_type->builtin_card
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= arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 1, "CARDINAL");
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builtin_m2_type->builtin_real
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= arch_float_type (gdbarch, gdbarch_float_bit (gdbarch), "REAL",
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gdbarch_float_format (gdbarch));
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builtin_m2_type->builtin_char
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= arch_character_type (gdbarch, TARGET_CHAR_BIT, 1, "CHAR");
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builtin_m2_type->builtin_bool
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= arch_boolean_type (gdbarch, gdbarch_int_bit (gdbarch), 1, "BOOLEAN");
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return builtin_m2_type;
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}
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static struct gdbarch_data *m2_type_data;
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const struct builtin_m2_type *
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builtin_m2_type (struct gdbarch *gdbarch)
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{
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return (const struct builtin_m2_type *) gdbarch_data (gdbarch, m2_type_data);
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}
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/* Initialization for Modula-2 */
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void
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_initialize_m2_language (void)
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{
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m2_type_data = gdbarch_data_register_post_init (build_m2_types);
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}
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