forked from Imagelibrary/binutils-gdb
1dd09e7f70
ptype is a bit funny, in that it accepts both expressions and type
names. It also evaluates the resulting expression using
EVAL_AVOID_SIDE_EFFECTS -- which both seems sensible (as a user would
you expect ptype to possibly cause inferior execution?), but is also a
historical artifact of how expressions are implemented (there's no
EVAL_FOR_TYPE).
In Ada, calling a function with an array will sometimes result in a
"thick pointer" array descriptor being made. This is essentially a
structure holding a pointer and bounds information.
Currently, in such a callee, printing the type of the array will yield
funny results:
(gdb) print str.all
$1 = "Hello World"
(gdb) ptype str
type = array (<>) of character
(gdb) ptype str.all
type = array (1 .. 0) of character
That "1 .. 0" is the result of an EVAL_AVOID_SIDE_EFFECTS branch
trying to do "something" with an array descriptor, without doing too
much.
I tried briefly to make this code really dereference the array
descriptor and get the correct runtime type. However, that proved to
be tricky; it certainly can't be done for all access types, because
that will cause dynamic type resolution and end up printing just the
runtime type -- which with variants may be pretty far from what the
user may expect.
Instead, this patch arranges to just leave such types alone in this
situation. I don't think this should have an extra effects, because
things like array subscripting still work on thick pointers.
This patch also touches arrayptr.exp, because in that case the access
type is a "thin pointer", and this ensures that the output does not
change in that scenario.
69 lines
2.3 KiB
Plaintext
69 lines
2.3 KiB
Plaintext
# Copyright 2008-2024 Free Software Foundation, Inc.
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#
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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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load_lib "ada.exp"
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require allow_ada_tests
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standard_ada_testfile foo
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# Note we don't test the "none" (no -fgnat-encodings option) scenario
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# here, because "all" and "minimal" cover the cases, and this way we
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# don't have to update the test when gnat changes its default.
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foreach_with_prefix scenario {all minimal} {
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set flags [list debug additional_flags=-fgnat-encodings=$scenario]
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if {[gdb_compile_ada "${srcfile}" "${binfile}-${scenario}" executable $flags] != ""} {
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return -1
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}
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clean_restart ${testfile}-${scenario}
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set bp_location [gdb_get_line_number "STOP" ${testdir}/foo.adb]
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runto "foo.adb:$bp_location"
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# Verify that a call to a function that takes an array as a parameter
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# works without problem.
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gdb_test "print call_me(\"bonjour\")" \
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"= void"
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# Verify that the array was passed properly by checking the global
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# variables that Call_Me sets as side-effects. Use the package name to avoid
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# name clash with debug info of system libraries.
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gdb_test "print pck.first" \
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"= 98 'b'" \
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"print first after function call"
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gdb_test "print pck.last" \
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"= 114 'r'" \
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"print last after function call"
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gdb_test "print pck.length" \
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"= 7" \
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"print length after function call"
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gdb_breakpoint "pck.call_me"
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gdb_continue_to_breakpoint call_me
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gdb_test "print str" " = \"Hello World\""
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gdb_test "ptype str" "type = array \\(<>\\) of character"
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gdb_test "ptype str.all" "type = array \\(<>\\) of character"
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# This surrounds the type in <> -- I don't know why but it's not
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# really relevant to the test.
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gdb_test "ptype str.all(0)" "type = <character>"
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}
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