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Currently, the Ada expression parser treats 'null' as an integer 0. However, this causes overloading to fail in certain cases. This patch changes the Ada expression parser to use a special type for 'null'. I chose pointer-to-int0, because I think that's not likely to be needed for any other Ada expression. Note this works because a "mod 1" type has an underlying non-zero byte size; the test includes a check for this. The output is changed so that "print null", by default, shows "null". And, ada_type_match is changed both to recognize the special null type and to remove a bit of weird code related to how pointers are treated for overload type matching. Tested on x86-64 Fedora 32. Because this only touches Ada, and Joel already approved it internally at AdaCore, I am checking it in. gdb/ChangeLog 2021-04-28 Tom Tromey <tromey@adacore.com> * ada-exp.y (primary): Use new type for null pointer. * ada-lang.c (ada_type_match): Remove "may_deref" parameter. Handle null pointer. (ada_args_match): Update. * ada-valprint.c (ada_value_print_ptr, ada_value_print): Handle null pointer. gdb/testsuite/ChangeLog 2021-04-28 Tom Tromey <tromey@adacore.com> * gdb.ada/null_overload.exp: New file. * gdb.ada/null_overload/foo.adb: New file.
38 lines
1.2 KiB
Plaintext
38 lines
1.2 KiB
Plaintext
# Copyright 2021 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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if { [skip_ada_tests] } { return -1 }
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standard_ada_testfile foo
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if {[gdb_compile_ada "${srcfile}" "${binfile}" executable {debug}] != ""} {
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return -1
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}
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clean_restart ${testfile}
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set bp_location [gdb_get_line_number "START" ${testdir}/foo.adb]
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runto "foo.adb:$bp_location"
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gdb_test "print f(null)" " = true"
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gdb_test "print f(r_access'(null))" " = true"
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gdb_test "print f(0)" " = false"
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gdb_test "print null" " = null"
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gdb_test "print/d null" " = 0"
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gdb_test "print U_Ptr" " = \\\(access foo\\.u_0\\\) 0x0"
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