# Copyright 2021 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/> .

# Testing GDB's implementation of LBOUND and UBOUND.

if {[skip_fortran_tests]} { return -1 }

standard_testfile ".F90"
load_lib fortran.exp

if {[prepare_for_testing ${testfile}.exp ${testfile} ${srcfile} \
	 {debug f90}]} {
    return -1
}

# Avoid shared lib symbols.
gdb_test_no_output "set auto-solib-add off"

if ![fortran_runto_main] {
    return -1
}

# Avoid libc symbols, in particular the 'array' type.
gdb_test_no_output "nosharedlibrary"

gdb_breakpoint [gdb_get_line_number "Test Breakpoint"]
gdb_breakpoint [gdb_get_line_number "Final Breakpoint"]

set found_final_breakpoint false

# We place a limit on the number of tests that can be run, just in
# case something goes wrong, and GDB gets stuck in an loop here.
set test_count 0
while { $test_count < 500 } {
    with_test_prefix "test $test_count" {
	incr test_count

	set expected_lbound ""
	set expected_ubound ""
	gdb_test_multiple "continue" "continue" {
	    -re ".*LBOUND = (\[^\r\n\]+)\r\n" {
		set expected_lbound $expect_out(1,string)
		exp_continue
	    }
	    -re ".*UBOUND = (\[^\r\n\]+)\r\n" {
		set expected_ubound $expect_out(1,string)
		exp_continue
	    }
	    -re "! Test Breakpoint" {
		set func_name "show_elem"
		exp_continue
	    }
	    -re "! Final Breakpoint" {
		set found_final_breakpoint true
		exp_continue
	    }
	    -re "$gdb_prompt $" {
		# We're done.
	    }
	}

	if ($found_final_breakpoint) {
	    break
	}

	verbose -log "APB: Run a test here"
	verbose -log "APB: Expected lbound '$expected_lbound'"
	verbose -log "APB: Expected ubound '$expected_ubound'"

	# We want to take a look at the line in the previous frame that
	# called the current function.  I couldn't find a better way of
	# doing this than 'up', which will print the line, then 'down'
	# again.
	#
	# I don't want to fill the log with passes for these up/down
	# commands, so we don't report any.  If something goes wrong then we
	# should get a fail from gdb_test_multiple.
	set array_name ""
	set xfail_data ""
	gdb_test_multiple "up" "up" {
	    -re "\r\n\[0-9\]+\[ \t\]+DO_TEST \\((\[^\r\n\]+)\\)\r\n$gdb_prompt $" {
		set array_name $expect_out(1,string)
	    }
	}

	# Check we have all the information we need to successfully run one
	# of these tests.
	if { $expected_lbound == "" } {
	    perror "failed to extract expected results for lbound"
	    return 0
	}
	if { $expected_ubound == "" } {
	    perror "failed to extract expected results for ubound"
	    return 0
	}
	if { $array_name == "" } {
	    perror "failed to extract array name"
	    return 0
	}

	# Check GDB can correctly print complete set of upper and
	# lower bounds for an array.
	set pattern [string_to_regexp " = $expected_lbound"]
	gdb_test "p lbound ($array_name)" "$pattern" \
	    "check value of lbound ('$array_name') expression"
	set pattern [string_to_regexp " = $expected_ubound"]
	gdb_test "p ubound ($array_name)" "$pattern" \
	    "check value of ubound ('$array_name') expression"

	# Now ask for each bound in turn and check it against the
	# expected results.
	#
	# First ask for bound 0.  This should fail, but will also tell
	# us the actual bounds of the array.  Thanks GDB.
	set upper_dim ""
	gdb_test_multiple "p lbound ($array_name, 0)" "" {
	    -re "\r\nLBOUND dimension must be from 1 to (\[0-9\]+)\r\n$gdb_prompt $" {
		set upper_dim $expect_out(1,string)
	    }
	}

	gdb_assert { ![string eq $upper_dim ""] } \
	    "extracted the upper dimension value"

	# Check that asking for the ubound dimension 0 gives the same
	# dimension range as in the lbound case.
	gdb_test_multiple "p ubound ($array_name, 0)" "" {
	    -re "\r\nUBOUND dimension must be from 1 to (\[0-9\]+)\r\n$gdb_prompt $" {
		gdb_assert {$upper_dim == $expect_out(1,string)} \
		    "ubound limit matches lbound limit"
	    }
	}

	# Now ask for the upper and lower bound for each dimension in
	# turn.  Add these results into a string which, when complete,
	# will look like the expected results seen above.
	set lbound_str ""
	set ubound_str ""
	set prefix "("
	for { set i 1 } { $i <= $upper_dim } { incr i } {
	    set v [get_valueof "/d" "lbound ($array_name, $i)" "???"]
	    set lbound_str "${lbound_str}${prefix}${v}"

	    set v [get_valueof "/d" "ubound ($array_name, $i)" "???"]
	    set ubound_str "${ubound_str}${prefix}${v}"

	    set prefix ", "
	}

	# Add closing parenthesis.
	set lbound_str "${lbound_str})"
	set ubound_str "${ubound_str})"

	gdb_assert [string eq ${lbound_str} $expected_lbound] \
	    "lbounds match"
	gdb_assert [string eq ${ubound_str} $expected_ubound] \
	    "ubounds match"

	# Finally, check that asking for a dimension above the valid
	# range gives the expected error.
	set bad_dim [expr $upper_dim + 1]
	gdb_test "p lbound ($array_name, $bad_dim)" \
	    "LBOUND dimension must be from 1 to $upper_dim" \
	    "check error message for lbound of dim = $bad_dim"

	gdb_test "p ubound ($array_name, $bad_dim)" \
	    "UBOUND dimension must be from 1 to $upper_dim" \
	    "check error message for ubound of dim = $bad_dim"

	# Move back up a frame just so we finish the test in frame 0.
	gdb_test_multiple "down" "down" {
	    -re "\r\n$gdb_prompt $" {
		# Don't issue a pass here.
	    }
	}
    }
}

# Ensure we reached the final breakpoint.  If more tests have been added
# to the test script, and this starts failing, then the safety 'while'
# loop above might need to be increased.
gdb_assert {$found_final_breakpoint} "reached final breakpoint"

# Now for some final tests.  This is mostly testing that GDB gives the
# correct errors in certain cases.
foreach var {str_1 an_int} {
    foreach func {lbound ubound} {
	gdb_test "p ${func} ($var)" \
	    "[string toupper $func] can only be applied to arrays"
    }
}