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d391f3721e
It's currently not possible to cast an in-memory value of a primitive
type to const reference:
```
(gdb) p Q.id
$1 = 42
(gdb) p (int&)Q.id
$2 = (int &) @0x22fd0c: 42
(gdb) p (const int&)Q.id
Attempt to take address of value not located in memory.
```
And if in a function call an argument needs the same kind of casting,
it also doesn't work:
```
(gdb) l f3
39 int f3(const int &i)
40 {
41 return i;
42 }
(gdb) p f3(Q.id)
Attempt to take address of value not located in memory.
```
It's because when the constness of the type changes in a call to
value_cast, a new not_lval value is allocated, which doesn't exist
in the target memory.
Fixed by ignoring const/volatile/restrict qualifications in
value_cast when comparing cast type to original type, so the new
value will point to the same location as the original value:
```
(gdb) p (int&)i
$2 = (int &) @0x39f72c: 1
(gdb) p (const int&)i
$3 = (const int &) @0x39f72c: 1
(gdb) p f3(Q.id)
$4 = 42
```
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=19423
Approved-By: Tom Tromey <tom@tromey.com>
66 lines
2.1 KiB
Plaintext
66 lines
2.1 KiB
Plaintext
# Tests for reference parameters of types and their subtypes in GDB.
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# Copyright 2006-2024 Free Software Foundation, Inc.
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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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#
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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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#
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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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# written by Paul N. Hilfinger (Hilfinger@adacore.com)
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#
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# test running programs
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#
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require allow_cplus_tests
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standard_testfile .cc
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if {[build_executable $testfile.exp $testfile $srcfile {debug c++}] == -1} {
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return -1
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}
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proc gdb_start_again { text } {
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global binfile
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global srcfile
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clean_restart $binfile
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runto ${srcfile}:[gdb_get_line_number $text]
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}
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gdb_start_again "marker1 here"
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gdb_test "print Q" ".*id = 42.*" "print value of a Child in main"
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gdb_test "print f1(Q)" ".* = 42.*" "print value of f1 on Child in main"
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gdb_test "print f2(Q)" ".* = 42.*" "print value of f2 on Child in main"
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gdb_start_again "marker1 here"
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gdb_test "print f1(QR)" ".* = 42.*" "print value of f1 on (Child&) in main"
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gdb_start_again "marker1 here"
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gdb_test "print f2(QR)" ".* = 42.*" "print value of f2 on (Child&) in main"
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gdb_start_again "marker2 here"
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gdb_test "print C" ".*id = 42.*" "print value of Child& in f2"
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gdb_test "print f1(C)" ".* = 42.*" "print value of f1 on Child& in f2"
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gdb_start_again "marker3 here"
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gdb_test "print R" ".*id = 42.*" "print value of Parent& in f1"
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gdb_start_again "breakpoint MQ here"
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gdb_test "print f1(MQ)" ".* = 53"
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gdb_test "print mf1(MQ)" ".* = 106"
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gdb_test "print mf2(MQ)" ".* = 106"
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gdb_test "print f1(MQR)" ".* = 53"
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gdb_test "print mf1(MQR)" ".* = 106"
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gdb_test "print mf2(MQR)" ".* = 106"
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gdb_test "print f3(Q.id)" ".* = 42"
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