2520f728b7
Assume foo_array is a pointer to a C structure. GDB must evaluate the
following expression properly, but it does not currently:
(gdb) print 1 && &foo_array[1].a
Attempt to take address of value not located in memory.
The problem is that in EVAL_AVOID_SIDE_EFFECTS mode,
eval.c:evaluate_subexp_standard always returns a not_lval value as the
result for a STRUCTOP_STRUCT operation. As a consequence, the rest of
the code believes that one cannot take the address of the returned
value.
This patch fixes STRUCTOP_STRUCT handling so that the VALUE_LVAL
attribute for the returned value is properly initialized. After this
change, the above session becomes:
(gdb) print 1 && &foo_array[1].a
$1 = 1
gdb/ChangeLog:
* eval.c (evaluate_subexp_standard) <STRUCTOP_STRUCT>: If
EVAL_AVOID_SIDE_EFFECTS mode, forward the VALUE_LVAL attribute
to the returned value.
gdb/testsuite/ChangeLog:
* gdb.base/nested-addr.c: New file.
* gdb.base/nested-addr.exp: New testcase.
Tested on x86_64-linux, no regression.
34 lines
1.1 KiB
Text
34 lines
1.1 KiB
Text
# Copyright 2015 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>. */
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standard_testfile
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if {[prepare_for_testing "${testfile}.exp" "${testfile}" "${srcfile}"]} {
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return -1
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}
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if ![runto_main] {
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return -1
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}
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gdb_breakpoint [gdb_get_line_number "BREAK"]
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gdb_continue_to_breakpoint "BREAK"
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# Sanity checking:
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gdb_test "print &foo_array\[1\].a" "= \\(int \\*\\) $hex.*"
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# A bug in EVAL_AVOID_SIDE_EFFECTS mode used to yield the following error:
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# Attempt to take address of value not located in memory.
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gdb_test "print 1 && &foo_array\[1\].a" "= 1"
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