binutils-gdb/gdb/testsuite/gdb.base/whatis-ptype-typedefs.exp

# Copyright 2017-2018 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 "whatis"/"ptype" of different typedef types, and of expressions
# involving casts to/from different typedefs.
#
# Particularly, when "whatis" is given a type name directly, it should
# strip one (and only one) typedef level.  Otherwise, it should not
# strip any typedef at all.  GDB used to incorrectly strip typedefs of
# expressions involving casts to typedef types.  E.g., (gdb) print
# (int_typedef)0" shall result in a value of type "int_typedef", not
# "int".

standard_testfile

# Prepare for testing in language LANG.  Lang can be "c" or "c++".

proc prepare {lang} {
    global srcfile testfile

    if [target_info exists no_long_long] {
	set options [list debug additional_flags=-DNO_LONG_LONG]
    } else {
	set options [list debug]
    }

    if {$lang == "c++"} {
	lappend options c++
	set out $testfile-cxx
    } else {
	set out $testfile-c
    }

    if { [prepare_for_testing "failed to prepare" \
	      ${out} [list $srcfile] $options] } {
	return 0
    }

    if ![runto_main] then {
	fail "can't run to main"
	return 0
    }

    return 1
}

# The following list is layed out as a table.  It is composed by
# sub-lists (lines), with each line representing one whatis/ptype
# test.  The sub-list (line) elements (columns) are (in order):
#
# EXP - The user expression passed to whatis/ptype.
#
# WHATIS - What "whatis" should print.
#
# If the EXP column is a type name, then this will be the same type,
# with one (and only one) typedef level removed.  Otherwise, this is
# the type of the expression on the first column, with all typedefs
# preserved.
#
# PTYPE - What "ptype" should print.
#
# This is always the type of the input type/expression stripped from
# all typedefs.
#
# LANGUAGE - If the line is language-specific, which language.
#
# This can be "c" or "c++".
#
# Columns in the table represent:
     # EXP                # whatis           # ptype           # language
set table {
    {"void_typedef"       "void"              "void"}
    {"void_typedef2"      "void_typedef"      "void"}

    {"int_typedef"        "int"              "int"}
    {"int_typedef2"       "int_typedef"      "int"}
    {"v_int_typedef"      "int_typedef"      "int"}
    {"v_int_typedef2"     "int_typedef2"     "int"}

    {"float_typedef"      "float"            "float"}
    {"float_typedef2"     "float_typedef"    "float"}
    {"v_float_typedef"    "float_typedef"    "float"}
    {"v_float_typedef2"   "float_typedef2"   "float"}

    {"double_typedef"     "double"           "double"}
    {"double_typedef2"    "double_typedef"   "double"}
    {"v_double_typedef"   "double_typedef"   "double"}
    {"v_double_typedef2"  "double_typedef2"  "double"}

    {"long_double_typedef"    "long double"           "long double"}
    {"long_double_typedef2"   "long_double_typedef"   "long double"}
    {"v_long_double_typedef"  "long_double_typedef"   "long double"}
    {"v_long_double_typedef2" "long_double_typedef2"  "long double"}

    {"colors_typedef"     "(enum )?colors"   "enum colors( : unsigned int)? {red, green, blue}"}
    {"colors_typedef2"    "colors_typedef"   "enum colors( : unsigned int)? {red, green, blue}"}
    {"v_colors_typedef"   "colors_typedef"   "enum colors( : unsigned int)? {red, green, blue}"}
    {"v_colors_typedef2"  "colors_typedef2"  "enum colors( : unsigned int)? {red, green, blue}"}

    {"func_ftype"         "void \\(void\\)"  "void \\(void\\)"}
    {"func_ftype2"        "func_ftype"       "void \\(void\\)"}

    {"func_ftype *"       "func_ftype \\*"   "void \\(\\*\\)\\(void\\)"}
    {"func_ftype2 *"      "func_ftype2 \\*"  "void \\(\\*\\)\\(void\\)"}
    {"v_func_ftype"       "func_ftype \\*"   "void \\(\\*\\)\\(void\\)"}
    {"v_func_ftype2"      "func_ftype2 \\*"  "void \\(\\*\\)\\(void\\)"}

    {"v_t_struct_typedef"                "t_struct_typedef"                "struct t_struct {.* member;.*}"}
    {"v_t_struct_typedef2"               "t_struct_typedef2"               "struct t_struct {.* member;.*}"}
    {"v_t_struct_union_wrapper_typedef"  "t_struct_union_wrapper_typedef"  "union t_struct_union_wrapper {.*base;.*}"}
    {"v_t_struct_union_wrapper_typedef2" "t_struct_union_wrapper_typedef2" "union t_struct_union_wrapper {.*base;.*}"}
    {"v_uchar_array_t_struct_typedef"    "uchar_array_t_struct_typedef"    "unsigned char \\[.*\\]"}
    {"v_uchar_array_t_struct_typedef2"   "uchar_array_t_struct_typedef2"   "unsigned char \\[.*\\]"}

    {"v_ns_Struct_typedef"               "ns_Struct_typedef"                "struct ns::Struct {.* method.*}"   "c++"}

    {"ns_method_ptr_typedef"
	"void \\(ns::Struct::\\*\\)\\(ns::Struct \\* const\\)"
	"void \\(ns::Struct::\\*\\)\\(ns::Struct \\* const\\)"
	"c++"}

    {"ns::method_ptr_typedef"
	"void \\(ns::Struct::\\*\\)\\(ns::Struct \\* const\\)"
	"void \\(ns::Struct::\\*\\)\\(ns::Struct \\* const\\)"
	"c++"}

    {"ns_method_ptr_typedef2"
	"ns_method_ptr_typedef"
	"void \\(ns::Struct::\\*\\)\\(ns::Struct \\* const\\)"
	"c++"}

    {"ns::method_ptr_typedef2"
	"ns::method_ptr_typedef"
	"void \\(ns::Struct::\\*\\)\\(ns::Struct \\* const\\)"
	"c++"}

    {"ns::Struct::method"
	"void \\(ns::Struct \\* const\\)"
	"void \\(ns::Struct \\* const\\)"
	"c++"}
}

# The 4th column above is optional.  If present, it indicates that the
# line should only be tested in the specified language.  This is a
# helper function that checks whether LINE's language matches LANG.
proc line_lang_match {line lang} {
    if {[llength $line] <= 3} {
	return true
    }

    set line_lang [lindex $line 3]
    if {$line_lang == "" || $lang == $line_lang} {
	return true
    }

    return false
}

# Run tests in language LANG.

proc run_tests {lang} {
    global table
    global gdb_prompt

    # Test passing all EXP in the list/table above to whatis/ptype,
    # and check what comes out.
    with_test_prefix "whatis/ptype" {
	foreach line $table {
	    set type [lindex $line 0]
	    set whatis [lindex $line 1]
	    set ptype [lindex $line 2]

	    if {![line_lang_match $line $lang]} {
		continue
	    }

	    # GCC doesn't record the target type of "typedef of
	    # typedef of void" types in the DWARF.  See
	    # <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81267>.
	    # Handle that case manually in order to be able to xfail
	    # it.
	    if {$type == "void_typedef2"} {
		set test "whatis $type"
		gdb_test_multiple $test $test {
		    -re "type = void\r\n$gdb_prompt $" {
			# gcc/81267.
			setup_xfail "*-*-*"
			fail "$test (void)"
		    }
		    -re "type = void_typedef\r\n$gdb_prompt $" {
			pass $test
		    }
		}
	    } else {
		gdb_test "whatis $type" "type = $whatis"
	    }

	    gdb_test "ptype $type" "type = $ptype"
	}
    }

    # If floats and pointers have the same size on this architecture,
    # then casting from array/function to float works, because
    # arrays/functions first decay to pointers, and then GDB's cast is
    # more general than a C cast and accepts any two types of the same
    # length.
    set float_ptr_same_size \
	[get_integer_valueof "sizeof (float) == sizeof (void *)" -1]

    # Ditto double.
    set double_ptr_same_size \
	[get_integer_valueof "sizeof (double) == sizeof (void *)" -1]

    # Ditto long double.
    set long_double_ptr_same_size \
	[get_integer_valueof "sizeof (long double) == sizeof (void *)" -1]

    # Test converting/casting all variables in the first column of the
    # table to all types (found in the first column of the table).
    # The aggregates are all defined to be the same size so that
    # casting actually works.  (GDB's casting operator is more general
    # than a C cast.)
    #
    # The main idea here is testing all the different paths in the
    # value casting code in GDB (value_cast), making sure typedefs are
    # preserved.
    with_test_prefix "cast" {
	foreach line1 $table {
	    set from [lindex $line1 0]

	    if {![line_lang_match $line1 $lang]} {
		continue
	    }

	    foreach line2 $table {
		set to [lindex $line2 0]
		set whatis [lindex $line2 1]
		set ptype [lindex $line2 2]

		if {![line_lang_match $line2 $lang]} {
		    continue
		}

		# We try all combinations, even those that don't
		# parse, or are invalid, to catch the case of a
		# regression making them inadvertently valid.  For
		# example, these convertions are invalid:
		#
		#  float <-> array   [iff sizeof pointer != sizeof float]
		#  array -> function (not function pointer)
		#  array -> member_ptr
		#
		# while these are invalid syntax:
		#
		#  (anything) type
		#  (var) anything
		#  (method) anything   [not method pointer]
		#  (float) method
		#
		if {([string match "v_*" $to]
		     || (![string match "v_*" $from] && ![string match "*method" $from])
		     || [string match "*method" $to])} {
		    gdb_test "whatis ($to) $from" "syntax error.*" "whatis ($to) $from (syntax)"
		    gdb_test "ptype ($to) $from" "syntax error.*" "ptype ($to) $from (syntax)"
		} elseif {([string match "*float*" $from] && [string match "*array*" $to])
			  || (!$float_ptr_same_size
			      && ([string match "float*" $to] && [string match "*array*" $from]
				  || [string match "float*" $to] && [string match "*method" $from]))
			  || (!$double_ptr_same_size
			      && ([string match "double*" $to] && [string match "*array*" $from]
				  || [string match "double*" $to] && [string match "*method" $from]))
			  || (!$long_double_ptr_same_size
			      && ([string match "long_double*" $to] && [string match "*array*" $from]
				  || [string match "long_double*" $to] && [string match "*method" $from]))
			  || ([string match "*ftype" $to] && [string match "*array*" $from])
			  || ([string match "*ftype2" $to] && [string match "*array*" $from])
			  || ([string match "*ftype" $to] && [string match "*method" $from])
			  || ([string match "*ftype2" $to] && [string match "*method" $from])
			  || ([string match "*method_ptr*" $to] && [string match "*method" $from])
			  || ([string match "*method_ptr*" $to] && [string match "*array*" $from])} {
		    gdb_test "whatis ($to) $from" "Invalid cast." "whatis ($to) $from (invalid)"
		    gdb_test "ptype ($to) $from" "Invalid cast." "ptype ($to) $from (invalid)"
		} else {
		    gdb_test "whatis ($to) $from" "type = [string_to_regexp $to]"
		    gdb_test "ptype ($to) $from" "type = $ptype"
		}
	    }
	}
    }
}

foreach_with_prefix lang {"c" "c++"} {
    if { [prepare $lang] } then {
	run_tests $lang
    }
}