gdb/testsuite/gdb.ada/float-bits.exp

# Copyright 2022-2024 Free Software Foundation, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Test floating-point literal extension.

load_lib "ada.exp"

require allow_ada_tests

standard_ada_testfile prog

if {[gdb_compile_ada "${srcfile}" "${binfile}" executable {debug}] != ""} {
    return -1
}

# Given a floating point EXPRESSION, return the size of the result.

proc float_size { expression } {

    set size 0
    gdb_test_multiple "ptype ${expression}" "" {
	-re -wrap "<16-byte float>" {
	    set size 16
	}
	-re -wrap "<12-byte float>" {
	    set size 12
	}
	-re -wrap "<\\d+-byte float>" {
	    # Assume 8 for anything less than or equal to 8.
	    set size 8
	}
    }

    return $size
}

clean_restart ${testfile}

set bp_location [gdb_get_line_number "BREAK" ${testdir}/prog.adb]
runto "prog.adb:$bp_location"

gdb_test "print 16f#41b80000#" " = 23.0"
gdb_test "print val_float" " = 23.0"
gdb_test "print val_float := 16f#41b80000#" " = 23.0"
gdb_test "print val_float" " = 23.0" \
    "print val_float after assignment"

gdb_test "print 16lf#bc0d83c94fb6d2ac#" " = -2.0e-19"
gdb_test "print val_double" " = -2.0e-19"
gdb_test "print val_double := 16lf#bc0d83c94fb6d2ac#" " = -2.0e-19"
gdb_test "print val_double" " = -2.0e-19" \
    "print val_double after assignment"

# Fetch the size of a compiler-generated long double.
set compiler_long_double_size [float_size "long_long_float" ]

# Fetch the size of an internal long double type in GDB.
set gdb_long_double_size [float_size "16llf#0#" ]

# Different architectures use different long double formats.  For
# example, IEEE quad versus i387 long doubles.  Account for that in the
# tests below.

# Get the used long double format.
set long_double_format ""
set cmd "maint print architecture"
gdb_test_multiple $cmd  "" {
    -re "^[string_to_regexp $cmd](?=\r\n)" {
	exp_continue
    }
    -re "^\r\ngdbarch_dump: long_double_format = (\[^\r\n\]*)(?=\r\n)" {
	set long_double_format $expect_out(1,string)
	exp_continue
    }
    -re "^\r\n$gdb_prompt $" {
	pass $gdb_test_name
    }
    -re "^\r\n(\[^\r\n\]*)(?=\r\n)" {
	exp_continue
    }
}

# Set default values for 128-bit IEEE quad long doubles.
set valid_long_double "16llf#4000921fb54442d18469898cc51701b8#"
set printed_long_double "3.1415926535897932384626433832795028"
set invalid_long_double ""
set has_invalid_long_double 0

switch -glob $long_double_format {
    floatformat_ibm_long_double_* {
	set w1 c1e1c00000000000
	set w2 4544adf4b7320335
	switch $long_double_format {
	    floatformat_ibm_long_double_big {
		set valid_long_double "16llf#$w2$w1#"
	    }
	    floatformat_ibm_long_double_little {
		set valid_long_double "16llf#$w1$w2#"
	    }
	}
	set printed_long_double "50000000000000000000000000.0"
    }
}

if { [istarget x86_64-*-* ] || [istarget i?86-*-*] } {
    # i387 long double have invalid values
    set has_invalid_long_double 1
    if { $compiler_long_double_size == 16 } {
	# 5.0e+25 in i387 128-bit long double.
	set valid_long_double "16llf#7ffff7ff4054a56fa5b99019a5c8#"
	set invalid_long_double "16llf#a56fa5b99019a5c800007ffff7ff4054#"
	set printed_long_double "5.0e\\+25"
    } elseif { $compiler_long_double_size == 12 } {
	# 5.0e+25 in i387 80-bit long double.
	set valid_long_double "16llf#56554054a56fa5b99019a5c8#"
	set invalid_long_double "16llf#9019a5c800007ffff7ff4054#"
	set printed_long_double "5.0e\\+25"
    }
}

# Exercise GDB-side long doubles.
if { $gdb_long_double_size > 8 } {
    gdb_test "print ${valid_long_double}" " = ${printed_long_double}"
    gdb_test "print \$foo:=${valid_long_double}" "= ${printed_long_double}"
    gdb_test "print \$foo" "= ${printed_long_double}" \
	"print internal long double variable after assignment"
}

# Exercise compiler-side long doubles.
if { $compiler_long_double_size > 8 } {
    gdb_test "print val_long_double" " = 5.0e\\+25"
    gdb_test "print val_long_double := ${valid_long_double}" \
	" = ${printed_long_double}"
    gdb_test "print val_long_double" " = ${printed_long_double}" \
	"print val_long_double after assignment"
}

# If the target has invalid long double values, test it now.
if { $has_invalid_long_double } {
    gdb_test "print ${invalid_long_double}" \
	" = <invalid float value>" "print invalid long double value"
}