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

# Copyright 2004, 2007, 2008, 2009, 2010 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 .

# 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

}

# 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;

}

# 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_no_output "set print sevenbit-strings"

    gdb_test_no_output "set print address off"

    gdb_test_no_output "set width 0"

    # 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]]

}

# 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_no_output "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

    # that it didn't know where the return value was.

    set test "return foo; ${tests}"

    set return_value_unknown 0

    set return_value_unimplemented 0

    gdb_test_multiple "return foo" "${test}" {

        -re "The location" {

            # Ulgh, a struct return, remember this (still need prompt).

            set return_value_unknown 1

            exp_continue

        }

        -re "A structure or union" {

            # Ulgh, a struct return, remember this (still need prompt).

            set return_value_unknown 1

            # Double ulgh.  Architecture doesn't use return_value and

            # hence hasn't implemented small structure return.

            set return_value_unimplemented 1

            exp_continue

        }

        -re "Make fun return now.*y or n. $" {

            gdb_test_multiple "y" "${test}" {

                -re "L *= fun.*${gdb_prompt} $" {

                    # Need to step off the function call

                    gdb_test "next" "zed.*" "${test}"

                }

                -re "zed \\(\\);.*$gdb_prompt $" {

                    pass "${test}"

                }

            }

        }

    }

    # If the previous test did not work, the program counter might

    # still be inside foo() rather than main().  Make sure the program

    # counter is is main().

    #

    # This happens on ppc64 GNU/Linux with gcc 3.4.1 and a buggy GDB

    set test "return foo; synchronize pc to main()"

    for {set loop_count 0} {$loop_count < 2} {incr loop_count} {

      gdb_test_multiple "backtrace 1" $test {

        -re "#0.*main \\(\\).*${gdb_prompt} $" {

          pass $test

          set loop_count 2

        }

        -re "#0.*fun \\(\\).*${gdb_prompt} $" {

          if {$loop_count < 1} {

            gdb_test "finish" ".*" ""

          } else {

            fail $test

            set loop_count 2

          }

        }

      }

    }

    # Check that the return-value is as expected.  At this stage we're

    # just checking that GDB has returned a value consistent with

    # "return_value_unknown" set above.

    set test "value foo returned; ${tests}"

    gdb_test_multiple "p/c L" "${test}" {

        -re " = 49 '1'.*${gdb_prompt} $" {

            if $return_value_unknown {

                # This contradicts the above claim that GDB didn't

                # know the location of the return-value.

                fail "${test}"

            } else {

                pass "${test}"

            }

        }

        -re " = 90 .*${gdb_prompt} $" {

            if $return_value_unknown {

                # The struct return case.  Since any modification

                # would be by reference, and that can't happen, the

                # value should be unmodified and hence Z is expected.

                # Is this a reasonable assumption?

                pass "${test}"

            } else {

                # This contradicts the above claim that GDB knew

                # the location of the return-value.

                fail "${test}"

            }

        }

        -re ".*${gdb_prompt} $" {

            if $return_value_unimplemented {

                # What a suprize.  The architecture hasn't implemented

                # return_value, and hence has to fail.

                kfail "$test" gdb/1444

            } else {

                fail "$test"

            }

        }

    }

    # Check that a "finish" works.

    # This is almost but not quite the same as "call struct funcs".

    # Architectures can have subtle differences in the two code paths.

    # The relevant code snippet is "L{n} = fun{n}()".  The program is

    # advanced into a call to  "fun{n}" and then that function is

    # finished.  The returned value that GDB prints, reformatted using

    # "p/c", is checked.

    # Get into "fun()".

    gdb_test "advance fun" \

            "fun .*\[\r\n\]+\[0-9\].*return foo.*" \

            "advance to fun for finish; ${tests}"

    # Check that the program invalidated the relevant global.

    gdb_test "p/c L" " = 90 'Z'" "zed L for finish; ${tests}"

    # Finish the function, set 'finish_value_unknown" to non-empty if the

    # return-value was not found.

    set test "finish foo; ${tests}"

    set finish_value_unknown 0

    gdb_test_multiple "finish" "${test}" {

        -re "Value returned is .*${gdb_prompt} $" {

            pass "${test}"

        }

        -re "Cannot determine contents.*${gdb_prompt} $" {

            # Expected bad value.  For the moment this is ok.

            set finish_value_unknown 1

            pass "${test}"

        }

    }

    # Re-print the last (return-value) using the more robust

    # "p/c".  If no return value was found, the 'Z' from the previous

    # check that the variable was cleared, is printed.

    set test "value foo finished; ${tests}"

    gdb_test_multiple "p/c" "${test}" {

        -re " = 49 '1'\[\r\n\]+${gdb_prompt} $" {

            if $finish_value_unknown {

                # This contradicts the above claim that GDB didn't

                # know the location of the return-value.

                fail "${test}"

            } else {

                pass "${test}"

            }

        }

        -re " = 90 'Z'\[\r\n\]+${gdb_prompt} $" {

            # The value didn't get found.  This is "expected".

            if $finish_value_unknown {

                pass "${test}"

            } else {

                # This contradicts the above claim that GDB did

                # know the location of the return-value.

                fail "${test}"

            }

        }

    }

    # Finally, check that "return" and finish" have consistent

    # behavior.

    # Since both "return" and "finish" use equivalent "which

    # return-value convention" logic, both commands should have

    # identical can/can-not find return-value messages.

    # Note that since "call" and "finish" use common code paths, a

    # failure here is a strong indicator of problems with "store

    # return-value" code paths.  Suggest looking at "return_value"

    # when investigating a fix.

    set test "return and finish use same convention; ${tests}"

    if {$finish_value_unknown == $return_value_unknown} {

        pass "${test}"

    } else {

        kfail gdb/1444 "${test}"

    }

}

# ABIs pass anything >8 or >16 bytes in memory but below that things

# randomly use register and/and structure conventions.  Check all

# possible sized char scalars in that range.  But only a restricted

# range of the other types.

# NetBSD/PPC returns "unnatural" (3, 5, 6, 7) sized scalars in memory.

# d10v is weird. 5/6 byte scalars go in memory.  2 or more char

# scalars go in memory.  Everything else is in a register!

# Test every single char struct from 1..17 in size.  This is what the

# original "scalars" test was doing.

start_scalars_test tc

test_scalar_calls

test_scalar_returns

# Let the fun begin.

# Assuming that any integer struct larger than 8 bytes goes in memory,

# come up with many and varied combinations of a return struct.  For

# "struct calls" test just beyond that 8 byte boundary, for "struct

# returns" test up to that boundary.

# For floats, assumed that up to two struct elements can be stored in

# floating point registers, regardless of their size.

# The approx size of each structure it is computed assumed that tc=1,

# ts=2, ti=4, tl=4, tll=8, tf=4, td=8, tld=16, and that all fields are

# naturally aligned.  Padding being added where needed.  Note that

# these numbers are just approx, the d10v has ti=2, a 64-bit has has

# tl=8.

# Approx size: 2, 4, ...

start_scalars_test ts

test_scalar_calls

test_scalar_returns

# Approx size: 4, 8, ...

start_scalars_test ti

test_scalar_calls

test_scalar_returns

# Approx size: 4, 8, ...

start_scalars_test tl

test_scalar_calls

test_scalar_returns

# Approx size: 8, 16, ...

start_scalars_test tll

test_scalar_calls

test_scalar_returns

# Approx size: 4, 8, ...

start_scalars_test tf

test_scalar_calls

test_scalar_returns

# Approx size: 8, 16, ...

start_scalars_test td

test_scalar_calls

test_scalar_returns

# Approx size: 16, 32, ...

start_scalars_test tld

test_scalar_calls

test_scalar_returns

# Approx size: 4, 8, ...

start_scalars_test te

test_scalar_calls

test_scalar_returns

return 0