# Copyright 2015-2020 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/>.

# Generic/oft used support routines for testing GDB's compile feature.

# Return 1 if we should skip tests of the "compile" feature.
# This must be invoked after the inferior has been started.

proc skip_compile_feature_tests {} {
    global gdb_prompt

    set result 0
    gdb_test_multiple "compile code -- ;" "check for working compile command" {
	"Could not load libcc1.*\r\n$gdb_prompt $" {
	    set result 1
	}
	-re "Command not supported on this host\\..*\r\n$gdb_prompt $" {
	    set result 1
	}
	-re "\r\n$gdb_prompt $" {
	}
    }
    return $result
}

# This namespace provides some convenience functions for running
# "compile code" and "compile print" tests.
#
# Exported functions are defined inline below.
#
# General usage:
#
# Start a new session, noting that the variable "var" will be used for
# "compile code" expressions.  This variable /must/ exist in the stopped
# location.
#
# CompileExpression::new "var"
#
# Test the implicit expression "foo;" with result/value 3.
# CompileExpression::test "foo" 3
# ---> Runs the following tests (name of tests ignored for illustration)
#    gdb_test_no_output "compile code var = foo"
#    gdb_test "p var" "= 3"
#    gdb_test "compile print foo;" "= 3"
#
# Test the explicit expression "a = function (3); var = a;" with the result 21.
# CompileExpression::test "a = function (3); var = a;" 21 -explicit
# ---> Runs the following tests (name of tests ignored for illustration)
#    gdb_test_no_output "compile code a = function (3); var = a;"
#    gdb_test "p var" "= 21"
#
# Additional option flags may be passed to test to control the behavior
# of the test harness:
#
# Pass -explicit to specify that the test uses an explicit expression,
# one which sets the value of the variable (see above).  Only the code test
# will be run.
#
# Pass -value and/or -print to indicate that the value and/or print steps
# will optionally fail. Specify "xfail" or "kfail" to indicate how
# particular step will fail.  These may be followed by any accepted DejaGNU
# parameters such as architecture and bug#.  [See examples below.]
#
# To specify that the compile (and consequently print and value tests) is
# expected to kfail/xfail, use -kfail or -xfail with any appropriate
# DejaGNU parameters.  Both options override -print and -value.
# [-xfail is given precedence over -kfail should both be given.]
#
# -value is used when a "code" test is run, specifying that the "compile
# code" and "print VAR" steps will fail in the prescribed manner.
# [If the print step generates a PASS, the test is considered invalidly
# written.  VAR's value should /always/ be invalidated before a test is
# run.]
#
# -print is used to specify that an expression will fail in the prescribed
# manner when "print" test is executed.
#
# Pass "-name NAME" to set an optional test name.  If not specified,
# the harness will use test names such as "compile code EXPR" and
# "result of compile code EXPR".
#
# Pass "-noprint" or "-nocode" to suppress print or code tests, respectively,
# This is useful when the expression being tested modifies the object
# being tested, e.g., "a++".
#
# These options must be passed LAST to CompileExpression::test.
#
# Examples:
#
# Both "code" and "print" tests are expected to xfail:
# CompileExpression add_imp "foo" 3 -compile {xfail *-*-*} -print {xfail *-*-*}
#
# The "print $VARIABLE" portion of the "code" test is expected to kfail
# (the actual "compile code" GDB command will succeed), but the "print"
# test should pass:
# CompileExpression add_imp "foo" 3 -value {kfail *-*-* gdb/1234}

namespace eval ::CompileExpression {

    # The variable name to check testing results.  This variable
    # must be in scope when tests are run.
    variable varName_ {}

    # Start a new expression list.  VARNAME is the name of the variable
    # that will be printed to check if the result of the test was
    # successful.
    proc new {varname} {
	variable varName_

	set varName_ $varname
    }

    # Test an expression.
    #
    # See the preamble for a list of valid optional arguments.
    #
    # Implicit expressions will be sent to GDB in the form
    # "$varName = $EXP".  "p $varName" will be used to decide the pass
    # or fail status of the test.
    #
    # Explicit expressions will be sent to GDB as-is and tested using only
    # "compile code".  The expression should set the value of the variable
    # $varName, which is then printed to determine whether the test passed
    # or failed.
    #
    # Unlike explicit expressions, implicit expressions are tested with both
    # "compile print" and "compile code".

    proc test {exp result args} {
	parse_args {{value {"" ""}} {print {"" ""}} {name ""}
	    {noprint} {nocode} {explicit} {xfail {"" ""}} {kfail {"" ""}}}

	if {[lindex $xfail 0] != ""} {
	    set l "xfail $xfail"
	} elseif {[lindex $kfail 0] != ""} {
	    set l "kfail $kfail"
	} else {
	    set l ""
	    set compile {"" ""}
	}
	if {$l != ""} {
	    set compile $l
	    set print $l
	    set value $l
	}

	if {!$nocode} {
	    do_test_ code $exp $result $explicit $name \
		[list $compile $value $print]
	}
	if {!$noprint} {
	    do_test_ print $exp $result $explicit $name \
		[list $compile $value $print]
	}
    }

    # Run a compile test for CMD ("print" or "code").

    proc do_test_ {cmd exp result is_explicit tst fail_list} {
	variable varName_

	if {![string match $cmd "code"]
	    && ![string match $cmd "print"]} {
	    error "invalid command, $cmd; should be \"print\" or \"compile\""
	}

	# Get expected result of test.  Will be "" if test is
	# expected to PASS.
	lassign $fail_list fail_compile fail_value fail_print

	# Set a test name if one hasn't been provided.
	if {$tst == ""} {
	    set tst "compile $cmd $exp"
	}

	if {[string match $cmd "print"]} {
	    if {!$is_explicit} {
		eval setup_failures_ $fail_print
		gdb_test "compile print $exp" $result $tst
	    }
	} else {
	    if {$is_explicit} {
		set command "compile code $exp"
	    } else {
		set command "compile code $varName_ = $exp"
	    }
	    eval setup_failures_ $fail_compile
	    gdb_test_no_output $command $tst
	    eval setup_failures_ $fail_value
	    gdb_test "p $varName_" "= $result" "result of $tst"
	}
    }

    # A convenience proc used to set up xfail and kfail tests.
    # HOW is either xfail or kfail (case is ignored).  ARGS is any
    # optional architecture, bug number, or other string to pass to
    # respective DejaGNU setup_$how routines.

    proc setup_failures_ {how args} {
	switch -nocase $how {
	    xfail {
		eval setup_xfail $args
	    }

	    kfail {
		eval setup_kfail $args
	    }

	    default {
		# Do nothing.  Either the test is expected to PASS
		# or we have an unhandled failure mode.
	    }
	}
    }
}