call-sc.exp

gdb-6.8 Linux下的调试程序 最新版本

# This testcase is part of GDB, the GNU debugger.

# Copyright 2004, 2007, 2008 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 "return", "finish", and "call" of functions that a scalar (int,
# float, enum) and/or take a single scalar parameter.

if $tracelevel then {
	strace $tracelevel
}

set prms_id 0
set bug_id 0

# Some targets can't call functions, so don't even bother with this
# test.

if [target_info exists gdb,cannot_call_functions] {
    setup_xfail "*-*-*"
    fail "This target can not call functions"
    continue
}

set testfile "call-sc"
set srcfile ${testfile}.c
set binfile ${objdir}/${subdir}/${testfile}

# Create and source the file that provides information about the
# compiler used to compile the test case.

if [get_compiler_info ${binfile}] {
    return -1;
}

# Use the file name, compiler and tuples to set up any needed KFAILs.

proc setup_kfails { file tuples bug } {
    global testfile
    if [string match $file $testfile] {
	foreach f $tuples { setup_kfail $f $bug }
    }
}

proc setup_compiler_kfails { file compiler format tuples bug } {
    global testfile
    if {[string match $file $testfile] && [test_compiler_info $compiler]  && [test_debug_format $format]} {
	foreach f $tuples { setup_kfail $f $bug }
    }
}

# Compile a variant of scalars.c using TYPE to specify the type of the
# parameter and return-type.  Run the compiled program up to "main".
# Also updates the global "testfile" to reflect the most recent build.

proc start_scalars_test { type } {
    global testfile
    global srcfile
    global binfile
    global objdir
    global subdir
    global srcdir
    global gdb_prompt
    global expect_out

    # Create the additional flags
    set flags "debug additional_flags=-DT=${type}"
    set testfile "call-sc-${type}"

    set binfile ${objdir}/${subdir}/${testfile}
    if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable "${flags}"] != "" } {
	# built the second test case since we can't use prototypes
	warning "Prototypes not supported, rebuilding with -DNO_PROTOTYPES"
	if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable "${flags} additional_flags=-DNO_PROTOTYPES"] != "" } {
	    untested call-sc.exp
	    return -1
	}
    }

    # Start with a fresh gdb.
    gdb_exit
    gdb_start
    gdb_reinitialize_dir $srcdir/$subdir
    gdb_load ${binfile}

    # Make certain that the output is consistent
    gdb_test "set print sevenbit-strings" "" \
	    "set print sevenbit-strings; ${testfile}"
    gdb_test "set print address off" "" \
	    "set print address off; ${testfile}"
    gdb_test "set width 0" "" \
	    "set width 0; ${testfile}"

    # Advance to main
    if { ![runto_main] } then {
	gdb_suppress_tests;
    }

    # Get the debug format
    get_debug_format

    # check that type matches what was passed in
    set test "ptype; ${testfile}"
    set foo_t "xxx"
    gdb_test_multiple "ptype ${type}" "${test}" {
	-re "type = (\[^\r\n\]*)\r\n$gdb_prompt $" {
	    set foo_t "$expect_out(1,string)"
	    pass "$test (${foo_t})"
	}
    }
    gdb_test "ptype foo" "type = ${foo_t}" "ptype foo; ${testfile} $expect_out(1,string)"
}


# Given N (0..25), return the corresponding alphabetic letter in lower
# or upper case.  This is ment to be i18n proof.

proc i2a { n } {
    return [string range "abcdefghijklmnopqrstuvwxyz" $n $n]
}

proc I2A { n } {
    return [string toupper [i2a $n]]
}


# Use the file name, compiler and tuples to set up any needed KFAILs.

proc setup_kfails { file tuples bug } {
    global testfile
    if [string match $file $testfile] {
	foreach f $tuples { setup_kfail $f $bug }
    }
}

proc setup_compiler_kfails { file compiler format tuples bug } {
    global testfile
    if {[string match $file $testfile] && [test_compiler_info $compiler]  && [test_debug_format $format]} {
	foreach f $tuples { setup_kfail $f $bug }
    }
}

# Test GDB's ability to make inferior function calls to functions
# returning (or passing) in a single scalar.

# start_scalars_test() will have previously built a program with a
# specified scalar type.  To ensure robustness of the output, "p/c" is
# used.

# This tests the code paths "which return-value convention?" and
# "extract return-value from registers" called by "infcall.c".

proc test_scalar_calls { } {
    global testfile
    global gdb_prompt

    # Check that GDB can always extract a scalar-return value from an
    # inferior function call.  Since GDB always knows the location of
    # an inferior function call's return value these should never fail
    
    # Implemented by calling the parameterless function "fun" and then
    # examining the return value printed by GDB.

    set tests "call ${testfile}"

    # Call fun, checking the printed return-value.
    gdb_test "p/c fun()" "= 49 '1'" "p/c fun(); ${tests}"

    # Check that GDB can always pass a structure to an inferior function.
    # This test can never fail.

    # Implemented by calling the one parameter function "Fun" which
    # stores its parameter in the global variable "L".  GDB then
    # examining that global to confirm that the value is as expected.

    gdb_test "call Fun(foo)" "" "call Fun(foo); ${tests}"
    gdb_test "p/c L" " = 49 '1'" "p/c L; ${tests}"
}

# Test GDB's ability to both return a function (with "return" or
# "finish") and correctly extract/store any corresponding
# return-value.

# Check that GDB can consistently extract/store structure return
# values.  There are two cases - returned in registers and returned in
# memory.  For the latter case, the return value can't be found and a
# failure is "expected".  However GDB must still both return the
# function and display the final source and line information.

# N identifies the number of elements in the struct that will be used
# for the test case.  FAILS is a list of target tuples that will fail
# this test.

# This tests the code paths "which return-value convention?", "extract
# return-value from registers", and "store return-value in registers".
# Unlike "test struct calls", this test is expected to "fail" when the
# return-value is in memory (GDB can't find the location).  The test
# is in three parts: test "return"; test "finish"; check that the two
# are consistent.  GDB can sometimes work for one command and not the
# other.

proc test_scalar_returns { } {
    global gdb_prompt
    global testfile

    set tests "return ${testfile}"


    # Check that "return" works.

    # GDB must always force the return of a function that has
    # a struct result.  Dependant on the ABI, it may, or may not be
    # possible to store the return value in a register.

    # The relevant code looks like "L{n} = fun{n}()".  The test forces
    # "fun{n}" to "return" with an explicit value.  Since that code
    # snippet will store the the returned value in "L{n}" the return
    # is tested by examining "L{n}".  This assumes that the
    # compiler implemented this as fun{n}(&L{n}) and hence that when
    # the value isn't stored "L{n}" remains unchanged.  Also check for
    # consistency between this and the "finish" case.

    # Get into a call of fun
    gdb_test "advance fun" \
	    "fun .*\[\r\n\]+\[0-9\].*return foo.*" \
	    "advance to fun for return; ${tests}"

    # Check that the program invalidated the relevant global.
    gdb_test "p/c L" " = 90 'Z'" "zed L for return; ${tests}"

    # Force the "return".  This checks that the return is always
    # performed, and that GDB correctly reported this to the user.
    # GDB 6.0 and earlier, when the return-value's location wasn't
    # known, both failed to print a final "source and line" and misplaced
    # the frame ("No frame").

    # The test is writen so that it only reports one FAIL/PASS for the
    # entire operation.  The value returned is checked further down.
    # "return_value_unknown", if non-empty, records why GDB realised