forked from Imagelibrary/binutils-gdb
aaab5fce4f
While it makes sense to allow accessing out-of-bounds elements in the debuggee and see whatever there might happen to be there in memory (we are a debugger and not a programming rules enforcement facility and we want to make people's life easier in chasing bugs), e.g.: (gdb) print one_hundred[-1] $1 = 0 (gdb) print one_hundred[100] $2 = 0 (gdb) we shouldn't really pretend that we have any meaningful data around values recorded in history (what these commands really retrieve are current debuggee memory contents outside the original data accessed, really confusing in my opinion). Mark values recorded in history as such then and verify accesses to be in-range for them: (gdb) print one_hundred[-1] $1 = <unavailable> (gdb) print one_hundred[100] $2 = <unavailable> Add a suitable test case, which also covers integer overflows in data location calculation. Approved-By: Tom Tromey <tom@tromey.com>
74 lines
2.7 KiB
Plaintext
74 lines
2.7 KiB
Plaintext
# Copyright (C) 2023 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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# Test GDB's value availability ranges.
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standard_testfile
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if { [prepare_for_testing "failed to prepare" $testfile $srcfile] } {
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return -1
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}
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if ![runto_main] then {
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perror "couldn't run to breakpoint"
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continue
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}
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set target_char_mask [get_valueof "/u" "a.x\[0]" "255" "get target char mask"]
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set target_char_bit 0
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for {set i $target_char_mask} {$i > 0} {set i [expr $i >> 1]} {
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incr target_char_bit
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}
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set target_char_rank -1
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for {set i $target_char_bit} {$i > 0} {set i [expr $i >> 1]} {
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incr target_char_rank
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}
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# Verify accesses to original inferior data.
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gdb_test "print a.a" "\\\$2 = '\\\\000' <repeats 1023 times>"
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gdb_test "print a.a\[-1\]" "\\\$3 = 0 '\\\\000'"
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gdb_test "print a.a\[1024\]" "\\\$4 = 0 '\\\\000'"
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# Verify in-range value history accesses.
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gdb_test "print \$2" "\\\$5 = '\\\\000' <repeats 1023 times>"
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gdb_test "print \$2\[0\]" "\\\$6 = 0 '\\\\000'"
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gdb_test "print \$2\[1023\]" "\\\$7 = 0 '\\\\000'"
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# Values outside the array recorded will have not been retrieved.
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gdb_test "print \$2\[-1\]" "\\\$8 = <unavailable>"
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gdb_test "print \$2\[1024\]" "\\\$9 = <unavailable>"
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gdb_test "print \$2\[-1LL << 63 - $target_char_rank\]" \
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"\\\$10 = <unavailable>"
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gdb_test "print \$2\[(1LL << 63 - $target_char_rank) - 1\]" \
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"\\\$11 = <unavailable>"
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# Accesses through pointers in history go straight to the inferior though.
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gdb_test "print \$2\[0\]@1" "\\\$12 = \"\""
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gdb_test "print \$2\[-1\]@1" "\\\$13 = \"\""
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gdb_test "print \$2\[1024\]@1" "\\\$14 = \"\""
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# Verify out-of-range value history accesses.
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gdb_test "print \$2\[(-1LL << 63 - $target_char_rank) - 1\]" \
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"Integer overflow in data location calculation"
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gdb_test "print \$2\[(1LL << 63 - $target_char_rank)\]" \
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"Integer overflow in data location calculation"
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gdb_test "print \$2\[-1LL << 63\]" \
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"Integer overflow in data location calculation"
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gdb_test "print \$2\[(1ULL << 63) - 1\]" \
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"Integer overflow in data location calculation"
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# Sanity-check a copy of an unavailable value.
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gdb_test "print \$11" "\\\$15 = <unavailable>"
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