8bdc16587e
Add two new internal functions $_cimag and $_creal that extract the
imaginary and real parts of a complex value.
These internal functions can take a complex value of any type 'float
complex', 'double complex', or 'long double complex' and return a
suitable floating point value 'float', 'double', or 'long double'.
So we can now do this:
(gdb) p z1
$1 = 1.5 + 4.5 * I
(gdb) p $_cimag (z1)
$4 = 4.5
(gdb) p $_creal (z1)
$4 = 1.5
The components of a complex value are not strictly named types in
DWARF, as the complex type is itself the base type. However, once we
are able to extract the components it makes sense to be able to ask
what the type of these components is and get a sensible answer back,
rather than the error we would currently get. Currently GDB says:
(gdb) ptype z1
type = complex double
(gdb) p $_cimag (z1)
$4 = 4.5
(gdb) ptype $
type = <invalid type code 9>
With the changes in dwarf2read.c, GDB now says:
(gdb) ptype z1
type = complex double
(gdb) p $_cimag (z1)
$4 = 4.5
(gdb) ptype $
type = double
Which seems to make more sense.
gdb/ChangeLog:
* NEWS: Mention new internal functions.
* dwarf2read.c (dwarf2_init_complex_target_type): New function.
(read_base_type): Use dwarf2_init_complex_target_type.
* value.c (creal_internal_fn): New function.
(cimag_internal_fn): New function.
(_initialize_values): Register new internal functions.
gdb/doc/ChangeLog:
* gdb.texinfo (Convenience Funs): Document '$_creal' and
'$_cimag'.
gdb/testsuite/ChangeLog:
* gdb.base/complex-parts.c: New file.
* gdb.base/complex-parts.exp: New file.
63 lines
1.9 KiB
Plaintext
63 lines
1.9 KiB
Plaintext
# Copyright 2019 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 "failed to prepare" $testfile $srcfile debug]} {
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return -1
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}
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if { ![runto_main] } then {
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fail "can't run to main"
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return 0
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}
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gdb_breakpoint [gdb_get_line_number "Break Here"]
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gdb_continue_to_breakpoint "breakpt" ".* Break Here\\. .*"
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gdb_test "p z1" " = 1.5 \\+ 4.5 \\* I"
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gdb_test "p z2" " = 2.5 \\+ -5.5 \\* I"
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gdb_test "p z3" " = 3.5 \\+ 6.5 \\* I"
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gdb_test "ptype z1" " = complex double"
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gdb_test "ptype z2" " = complex float"
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gdb_test "ptype z3" " = complex long double"
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gdb_test "p \$_cimag (z1)" " = 4.5"
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gdb_test "ptype \$" " = double"
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gdb_test "p \$_cimag (z2)" " = -5.5"
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gdb_test "ptype \$" " = float"
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gdb_test "p \$_cimag (z3)" " = 6.5"
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gdb_test "ptype \$" " = long double"
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gdb_test "p \$_creal (z1)" " = 1.5"
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gdb_test "ptype \$" " = double"
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gdb_test "p \$_creal (z2)" " = 2.5"
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gdb_test "ptype \$" " = float"
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gdb_test "p \$_creal (z3)" " = 3.5"
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gdb_test "ptype \$" " = long double"
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gdb_test "p \$_cimag (d1)" "expected a complex number"
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gdb_test "p \$_cimag (f1)" "expected a complex number"
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gdb_test "p \$_cimag (i1)" "expected a complex number"
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gdb_test "p \$_creal (d1)" "expected a complex number"
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gdb_test "p \$_creal (f1)" "expected a complex number"
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gdb_test "p \$_creal (i1)" "expected a complex number"
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