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459 lines
14 KiB
Plaintext
459 lines
14 KiB
Plaintext
# This testcase is part of GDB, the GNU debugger.
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# Copyright 2004-2015 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Test "return", "finish", and "call" of functions that a scalar (int,
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# float, enum) and/or take a single scalar parameter.
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# Some targets can't call functions, so don't even bother with this
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# test.
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if [target_info exists gdb,cannot_call_functions] {
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setup_xfail "*-*-*"
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fail "This target can not call functions"
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continue
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}
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standard_testfile .c
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# Create and source the file that provides information about the
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# compiler used to compile the test case.
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if [get_compiler_info] {
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return -1
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}
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# Compile a variant of scalars.c using TYPE to specify the type of the
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# parameter and return-type. Run the compiled program up to "main".
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# Also updates the global "testfile" to reflect the most recent build.
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proc start_scalars_test { type } {
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global testfile
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global srcfile
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global binfile
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global subdir
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global srcdir
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global gdb_prompt
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global expect_out
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# Create the additional flags
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set flags "debug additional_flags=-DT=${type}"
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set testfile "call-sc-${type}"
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set binfile [standard_output_file ${testfile}]
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if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable "${flags}"] != "" } {
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# built the second test case since we can't use prototypes
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warning "Prototypes not supported, rebuilding with -DNO_PROTOTYPES"
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if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable "${flags} additional_flags=-DNO_PROTOTYPES"] != "" } {
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untested call-sc.exp
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return -1
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}
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}
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# Start with a fresh gdb.
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gdb_exit
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gdb_start
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gdb_reinitialize_dir $srcdir/$subdir
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gdb_load ${binfile}
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# Make certain that the output is consistent
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gdb_test_no_output "set print sevenbit-strings"
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gdb_test_no_output "set print address off"
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gdb_test_no_output "set width 0"
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# Advance to main
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if { ![runto_main] } then {
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gdb_suppress_tests
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}
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# Get the debug format
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get_debug_format
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# check that type matches what was passed in
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set test "ptype; ${testfile}"
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set foo_t "xxx"
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gdb_test_multiple "ptype/r ${type}" "${test}" {
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-re "type = (\[^\r\n\]*)\r\n$gdb_prompt $" {
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set foo_t "$expect_out(1,string)"
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pass "$test (${foo_t})"
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}
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}
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gdb_test "ptype/r foo" "type = ${foo_t}" "ptype foo; ${testfile} $expect_out(1,string)"
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}
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# Given N (0..25), return the corresponding alphabetic letter in lower
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# or upper case. This is ment to be i18n proof.
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proc i2a { n } {
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return [string range "abcdefghijklmnopqrstuvwxyz" $n $n]
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}
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proc I2A { n } {
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return [string toupper [i2a $n]]
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}
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# Test GDB's ability to make inferior function calls to functions
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# returning (or passing) in a single scalar.
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# start_scalars_test() will have previously built a program with a
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# specified scalar type. To ensure robustness of the output, "p/c" is
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# used.
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# This tests the code paths "which return-value convention?" and
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# "extract return-value from registers" called by "infcall.c".
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proc test_scalar_calls { } {
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global testfile
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global gdb_prompt
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# Check that GDB can always extract a scalar-return value from an
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# inferior function call. Since GDB always knows the location of
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# an inferior function call's return value these should never fail
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# Implemented by calling the parameterless function "fun" and then
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# examining the return value printed by GDB.
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set tests "call ${testfile}"
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# Call fun, checking the printed return-value.
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gdb_test "p/c fun()" "= 49 '1'" "p/c fun(); ${tests}"
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# Check that GDB can always pass a structure to an inferior function.
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# This test can never fail.
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# Implemented by calling the one parameter function "Fun" which
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# stores its parameter in the global variable "L". GDB then
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# examining that global to confirm that the value is as expected.
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gdb_test_no_output "call Fun(foo)" "call Fun(foo); ${tests}"
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gdb_test "p/c L" " = 49 '1'" "p/c L; ${tests}"
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}
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# Test GDB's ability to both return a function (with "return" or
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# "finish") and correctly extract/store any corresponding
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# return-value.
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# Check that GDB can consistently extract/store structure return
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# values. There are two cases - returned in registers and returned in
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# memory. For the latter case, the return value can't be found and a
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# failure is "expected". However GDB must still both return the
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# function and display the final source and line information.
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# N identifies the number of elements in the struct that will be used
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# for the test case. FAILS is a list of target tuples that will fail
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# this test.
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# This tests the code paths "which return-value convention?", "extract
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# return-value from registers", and "store return-value in registers".
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# Unlike "test struct calls", this test is expected to "fail" when the
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# return-value is in memory (GDB can't find the location). The test
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# is in three parts: test "return"; test "finish"; check that the two
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# are consistent. GDB can sometimes work for one command and not the
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# other.
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proc test_scalar_returns { } {
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global gdb_prompt
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global testfile
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set tests "return ${testfile}"
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# Check that "return" works.
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# GDB must always force the return of a function that has
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# a struct result. Dependant on the ABI, it may, or may not be
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# possible to store the return value in a register.
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# The relevant code looks like "L{n} = fun{n}()". The test forces
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# "fun{n}" to "return" with an explicit value. Since that code
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# snippet will store the returned value in "L{n}" the return
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# is tested by examining "L{n}". This assumes that the
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# compiler implemented this as fun{n}(&L{n}) and hence that when
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# the value isn't stored "L{n}" remains unchanged. Also check for
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# consistency between this and the "finish" case.
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# Get into a call of fun
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gdb_test "advance fun" \
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"fun .*\[\r\n\]+\[0-9\].*return foo.*" \
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"advance to fun for return; ${tests}"
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# Check that the program invalidated the relevant global.
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gdb_test "p/c L" " = 90 'Z'" "zed L for return; ${tests}"
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# Force the "return". This checks that the return is always
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# performed, and that GDB correctly reported this to the user.
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# GDB 6.0 and earlier, when the return-value's location wasn't
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# known, both failed to print a final "source and line" and misplaced
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# the frame ("No frame").
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# The test is writen so that it only reports one FAIL/PASS for the
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# entire operation. The value returned is checked further down.
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# "return_value_unknown", if non-empty, records why GDB realised
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# that it didn't know where the return value was.
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set test "return foo; ${tests}"
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set return_value_unknown 0
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set return_value_unimplemented 0
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gdb_test_multiple "return foo" "${test}" {
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-re "The location" {
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# Ulgh, a struct return, remember this (still need prompt).
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set return_value_unknown 1
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exp_continue
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}
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-re "A structure or union" {
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# Ulgh, a struct return, remember this (still need prompt).
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set return_value_unknown 1
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# Double ulgh. Architecture doesn't use return_value and
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# hence hasn't implemented small structure return.
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set return_value_unimplemented 1
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exp_continue
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}
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-re "Make fun return now.*y or n. $" {
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gdb_test_multiple "y" "${test}" {
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-re "L *= fun.*${gdb_prompt} $" {
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# Need to step off the function call
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gdb_test "next" "zed.*" "${test}"
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}
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-re "zed \\(\\);.*$gdb_prompt $" {
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pass "${test}"
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}
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}
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}
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}
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# If the previous test did not work, the program counter might
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# still be inside foo() rather than main(). Make sure the program
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# counter is is main().
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#
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# This happens on ppc64 GNU/Linux with gcc 3.4.1 and a buggy GDB
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set test "return foo; synchronize pc to main()"
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for {set loop_count 0} {$loop_count < 2} {incr loop_count} {
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gdb_test_multiple "backtrace 1" $test {
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-re "#0.*main \\(\\).*${gdb_prompt} $" {
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pass $test
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set loop_count 2
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}
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-re "#0.*fun \\(\\).*${gdb_prompt} $" {
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if {$loop_count < 1} {
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gdb_test "finish" ".*" ""
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} else {
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fail $test
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set loop_count 2
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}
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}
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}
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}
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# Check that the return-value is as expected. At this stage we're
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# just checking that GDB has returned a value consistent with
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# "return_value_unknown" set above.
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set test "value foo returned; ${tests}"
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gdb_test_multiple "p/c L" "${test}" {
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-re " = 49 '1'.*${gdb_prompt} $" {
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if $return_value_unknown {
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# This contradicts the above claim that GDB didn't
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# know the location of the return-value.
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fail "${test}"
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} else {
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pass "${test}"
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}
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}
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-re " = 90 .*${gdb_prompt} $" {
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if $return_value_unknown {
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# The struct return case. Since any modification
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# would be by reference, and that can't happen, the
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# value should be unmodified and hence Z is expected.
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# Is this a reasonable assumption?
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pass "${test}"
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} else {
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# This contradicts the above claim that GDB knew
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# the location of the return-value.
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fail "${test}"
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}
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}
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-re ".*${gdb_prompt} $" {
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if $return_value_unimplemented {
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# What a suprize. The architecture hasn't implemented
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# return_value, and hence has to fail.
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kfail "$test" gdb/1444
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} else {
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fail "$test"
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}
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}
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}
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# Check that a "finish" works.
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# This is almost but not quite the same as "call struct funcs".
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# Architectures can have subtle differences in the two code paths.
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# The relevant code snippet is "L{n} = fun{n}()". The program is
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# advanced into a call to "fun{n}" and then that function is
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# finished. The returned value that GDB prints, reformatted using
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# "p/c", is checked.
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# Get into "fun()".
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gdb_test "advance fun" \
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"fun .*\[\r\n\]+\[0-9\].*return foo.*" \
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"advance to fun for finish; ${tests}"
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# Check that the program invalidated the relevant global.
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gdb_test "p/c L" " = 90 'Z'" "zed L for finish; ${tests}"
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# Finish the function, set 'finish_value_unknown" to non-empty if the
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# return-value was not found.
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set test "finish foo; ${tests}"
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set finish_value_unknown 0
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gdb_test_multiple "finish" "${test}" {
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-re "Value returned is .*${gdb_prompt} $" {
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pass "${test}"
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}
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-re "Cannot determine contents.*${gdb_prompt} $" {
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# Expected bad value. For the moment this is ok.
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set finish_value_unknown 1
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pass "${test}"
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}
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}
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# Re-print the last (return-value) using the more robust
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# "p/c". If no return value was found, the 'Z' from the previous
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# check that the variable was cleared, is printed.
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set test "value foo finished; ${tests}"
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gdb_test_multiple "p/c" "${test}" {
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-re " = 49 '1'\[\r\n\]+${gdb_prompt} $" {
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if $finish_value_unknown {
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# This contradicts the above claim that GDB didn't
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# know the location of the return-value.
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fail "${test}"
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} else {
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pass "${test}"
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}
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}
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-re " = 90 'Z'\[\r\n\]+${gdb_prompt} $" {
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# The value didn't get found. This is "expected".
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if $finish_value_unknown {
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pass "${test}"
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} else {
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# This contradicts the above claim that GDB did
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# know the location of the return-value.
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fail "${test}"
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}
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}
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}
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# Finally, check that "return" and finish" have consistent
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# behavior.
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# Since both "return" and "finish" use equivalent "which
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# return-value convention" logic, both commands should have
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# identical can/can-not find return-value messages.
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# Note that since "call" and "finish" use common code paths, a
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# failure here is a strong indicator of problems with "store
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# return-value" code paths. Suggest looking at "return_value"
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# when investigating a fix.
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set test "return and finish use same convention; ${tests}"
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if {$finish_value_unknown == $return_value_unknown} {
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pass "${test}"
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} else {
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kfail gdb/1444 "${test}"
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}
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}
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# ABIs pass anything >8 or >16 bytes in memory but below that things
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# randomly use register and/and structure conventions. Check all
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# possible sized char scalars in that range. But only a restricted
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# range of the other types.
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# NetBSD/PPC returns "unnatural" (3, 5, 6, 7) sized scalars in memory.
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# d10v is weird. 5/6 byte scalars go in memory. 2 or more char
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# scalars go in memory. Everything else is in a register!
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# Test every single char struct from 1..17 in size. This is what the
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# original "scalars" test was doing.
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start_scalars_test tc
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test_scalar_calls
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test_scalar_returns
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# Let the fun begin.
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# Assuming that any integer struct larger than 8 bytes goes in memory,
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# come up with many and varied combinations of a return struct. For
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# "struct calls" test just beyond that 8 byte boundary, for "struct
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# returns" test up to that boundary.
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# For floats, assumed that up to two struct elements can be stored in
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# floating point registers, regardless of their size.
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# The approx size of each structure it is computed assumed that tc=1,
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# ts=2, ti=4, tl=4, tll=8, tf=4, td=8, tld=16, and that all fields are
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# naturally aligned. Padding being added where needed. Note that
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# these numbers are just approx, the d10v has ti=2, a 64-bit has has
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# tl=8.
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# Approx size: 2, 4, ...
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start_scalars_test ts
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test_scalar_calls
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test_scalar_returns
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# Approx size: 4, 8, ...
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start_scalars_test ti
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test_scalar_calls
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test_scalar_returns
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# Approx size: 4, 8, ...
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start_scalars_test tl
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test_scalar_calls
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test_scalar_returns
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# Approx size: 8, 16, ...
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start_scalars_test tll
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test_scalar_calls
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test_scalar_returns
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if ![target_info exists gdb,skip_float_tests] {
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# Approx size: 4, 8, ...
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start_scalars_test tf
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test_scalar_calls
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test_scalar_returns
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# Approx size: 8, 16, ...
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start_scalars_test td
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test_scalar_calls
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test_scalar_returns
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# Approx size: 16, 32, ...
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start_scalars_test tld
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test_scalar_calls
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test_scalar_returns
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}
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# Approx size: 4, 8, ...
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start_scalars_test te
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test_scalar_calls
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test_scalar_returns
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return 0
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