78 lines
2.6 KiB
Text
78 lines
2.6 KiB
Text
# Copyright 2021-2022 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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# Check that GDB does not do excess accesses to the inferior memory
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# when fetching elements from an array in the C language.
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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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return -1
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}
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# Load 'global_foo' into a history variable.
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gdb_test "p global_foo" "\\{f = 1, array = \\{1, 2, 3, 4, 5\\}\\}"
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gdb_test_no_output "set debug target 1"
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# Now print an array element from within 'global_foo', but accessed
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# via the history element. The history element should be non-lazy,
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# and so there should be no reason for GDB to fetch the array element
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# from the inferior memory, we should be able to grab the contents
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# directory from the history value.
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#
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# To check this we 'set debug target 1' (above), and then look for any
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# xfer_partial calls; there shouldn't be any.
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set saw_memory_access false
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gdb_test_multiple "p \$.array\[1\]" "" {
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-re "^p \\\$\\.array\\\[1\\\]\r\n" {
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exp_continue
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}
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-re "^->\[^\r\n\]+xfer_partial\[^\r\n\]+\r\n" {
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set saw_memory_access true
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exp_continue
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}
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-re "^->\[^\r\n\]+\r\n" {
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exp_continue
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}
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-re "^<-\[^\r\n\]+\r\n" {
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exp_continue
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}
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-re "^\[^\$\]\[^\r\n\]+\r\n" {
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exp_continue
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}
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-re "^\\\$${decimal} = 2\r\n$gdb_prompt " {
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gdb_assert { ! $saw_memory_access }
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}
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}
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gdb_test "set debug target 0" ".*"
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if { ! [skip_python_tests] } {
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gdb_test_no_output "python val = gdb.parse_and_eval('global_foo')"
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gdb_test "python print('val = %s' % val)" "val = \\{f = 1, array = \\{1, 2, 3, 4, 5\\}\\}"
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gdb_test "python print('val.is_lazy = %s' % val.is_lazy)" "val\\.is_lazy = False"
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# Grab an element from the array within VAL. The element should
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# immediately be non-lazy as the value contents can be copied
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# directly from VAL.
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gdb_test_no_output "python elem = val\['array'\]\[1\]"
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gdb_test "python print('elem.is_lazy = %s' % elem.is_lazy)" "elem\\.is_lazy = False"
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gdb_test "python print('elem = %s' % elem)" "elem = 2"
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}
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