gdb/testsuite/gdb.guile/scm-ports.exp

# Copyright (C) 2014-2020 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/>.

# This file is part of the GDB testsuite.
# It tests GDB provided ports.

load_lib gdb-guile.exp

standard_testfile

if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile}] } {
    return
}

# Skip all tests if Guile scripting is not enabled.
if { [skip_guile_tests] } { continue }

if ![gdb_guile_runto_main] {
   return
}

gdb_reinitialize_dir $srcdir/$subdir

gdb_install_guile_utils
gdb_install_guile_module

gdb_scm_test_silent_cmd "guile (use-modules (rnrs io ports) (rnrs bytevectors))" \
    "import (rnrs io ports) (rnrs bytevectors)"

gdb_test "guile (print (stdio-port? 42))" "= #f"
gdb_test "guile (print (stdio-port? (%make-void-port \"r\")))" "= #f"
gdb_test "guile (print (stdio-port? (input-port)))" "= #t"
gdb_test "guile (print (stdio-port? (output-port)))" "= #t"
gdb_test "guile (print (stdio-port? (error-port)))" "= #t"

# Test memory port open/close.

proc test_port { mode } {
    with_test_prefix "basic $mode tests" {
	gdb_test_no_output "guile (define my-port (open-memory #:mode \"$mode\"))" \
	    "create memory port"
	gdb_test "guile (print (memory-port? my-port))" "= #t"
	switch -glob $mode {
	    "r+*" {
		gdb_test "guile (print (input-port? my-port))" "= #t"
		gdb_test "guile (print (output-port? my-port))" "= #t"
	    }
	    "r*" {
		gdb_test "guile (print (input-port? my-port))" "= #t"
		gdb_test "guile (print (output-port? my-port))" "= #f"
	    }
	    "w*" {
		gdb_test "guile (print (input-port? my-port))" "= #f"
		gdb_test "guile (print (output-port? my-port))" "= #t"
	    }
	    default {
		error "bad test mode"
	    }
	}
	gdb_test "guile (print (port-closed? my-port))" "= #f" \
	    "test port-closed? before it's closed"
	gdb_test "guile (print (close-port my-port))" "= #t"
	gdb_test "guile (print (port-closed? my-port))" "= #t" \
	    "test port-closed? after it's closed"
    }
}

set port_variations { r w r+ rb wb r+b r0 w0 r+0 }
foreach variation $port_variations {
    test_port $variation
}

# Test read/write of memory ports.

proc test_mem_port_rw { kind } {
    if { "$kind" == "buffered" } {
	set buffered 1
    } else {
	set buffered 0
    }
    with_test_prefix $kind {
	if $buffered {
	    set mode "r+"
	} else {
	    set mode "r+0"
	}
	gdb_test_no_output "guile (define rw-mem-port (open-memory #:mode \"$mode\"))" \
	    "create r/w memory port"
	gdb_test "guile (print rw-mem-port)" \
	    "#<input-output: gdb:memory-port 0x0-0xf+>"
	gdb_test_no_output "guile (define sp-reg (parse-and-eval \"\$sp\"))" \
	    "get sp reg"
	# Note: Only use $sp_reg for gdb_test result matching, don't use it in
	# gdb commands.  Otherwise transcript.N becomes unusable.
	set sp_reg [get_valueof /u "\$sp" 0]
	gdb_test_no_output "guile (define byte-at-sp (parse-and-eval \"*(char*) \$sp\"))" \
	    "save current value at sp"
	# Pass the result of parse-and-eval through value-fetch-lazy!,
	# otherwise the value gets left as a lazy reference to memory, which
	# when re-evaluated after we flush the write will yield the newly
	# written value.  PR 18175
	gdb_test_no_output "guile (value-fetch-lazy! byte-at-sp)" \
	    "un-lazyify byte-at-sp"
	gdb_test "guile (print (seek rw-mem-port (value->integer sp-reg) SEEK_SET))" \
	    "= $sp_reg" \
	    "seek to \$sp"
	gdb_test_no_output "guile (define old-value (value->integer byte-at-sp))" \
	    "define old-value"
	gdb_test_no_output "guile (define new-value (logxor old-value 1))" \
	    "define new-value"
	gdb_test "guile (print (put-bytevector rw-mem-port (make-bytevector 1 new-value)))" \
	    "= #<unspecified>"
	if $buffered {
	    # Value shouldn't be in memory yet.
	    gdb_test "guile (print (value=? (parse-and-eval \"*(char*) \$sp\") byte-at-sp))" \
		"= #t" \
		"test byte at sp, before flush"
	    gdb_test_no_output "guile (force-output rw-mem-port)" \
		"flush port"
	}
	# Value should be in memory now.
	gdb_test "guile (print (value=? (parse-and-eval \"*(char*) \$sp\") byte-at-sp))" \
	    "= #f" \
	    "test byte at sp, after flush"
	# Restore the value for cleanliness sake, and to verify close-port
	# flushes the buffer.
	gdb_test "guile (print (seek rw-mem-port (value->integer sp-reg) SEEK_SET))" \
	    "= $sp_reg" \
	    "seek to \$sp for restore"
	gdb_test "guile (print (put-bytevector rw-mem-port (make-bytevector 1 old-value)))" \
	    "= #<unspecified>"
	gdb_test "guile (print (close-port rw-mem-port))" \
	    "= #t"
	gdb_test "guile (print (value=? (parse-and-eval \"*(char*) \$sp\") byte-at-sp))" \
	    "= #t" \
	    "test byte at sp, after close"
    }
}

test_mem_port_rw buffered
test_mem_port_rw unbuffered

# Test zero-length memory ports.

gdb_test_no_output "guile (define zero-mem-port (open-memory #:start 0 #:size 0 #:mode \"r+\"))" \
    "create zero length memory port"
gdb_test "guile (print (read-char zero-mem-port))" \
    "= #<eof>"
gdb_test "guile (print (write-char #\\a zero-mem-port))" \
    "ERROR: .*Out of range: writing beyond end of memory range.*Error while executing Scheme code."
gdb_test "guile (print (get-bytevector-n zero-mem-port 0))" \
    "= #vu8\\(\\)"
gdb_test "guile (print (put-bytevector zero-mem-port (make-bytevector 0)))" \
    "= #<unspecified>"
gdb_test "guile (print (close-port zero-mem-port))" "= #t"