gdb-8.0.1/gdb/testsuite/gdb.base/jit-simple.exp

# Copyright 2012-2017 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 re-running an inferior with a JIT descriptor, where the JIT
# descriptor changes address between runs.
# http://sourceware.org/bugzilla/show_bug.cgi?id=13431

# Test both the case of the JIT reader being included in the main
# program directly, and the case of the JIT reader being split out to
# a shared library.

# For completeness, also test when the JIT descriptor does not change
# address between runs.

if {[skip_shlib_tests]} {
    untested "skipping shared library tests"
    return -1
}

standard_testfile

set libname $testfile-jit
set srcfile_lib $srcdir/$subdir/$libname.c
set binfile_lib [standard_output_file $libname.so]

# Build a standalone JIT binary.

proc build_standalone_jit {{options ""}} {
    global testfile srcfile binfile

    lappend options "debug"

    if {[build_executable $testfile.exp $testfile $srcfile $options] == -1} {
	return -1
    }

    return 0
}

# Build the shared library JIT.

proc build_shared_jit {{options ""}} {
    global testfile
    global srcfile_lib binfile_lib

    lappend options "debug additional_flags=-fPIC"
    if { [gdb_compile_shlib $srcfile_lib $binfile_lib $options] != "" } {
	return -1
    }

    return 0
}

if {[build_standalone_jit] == -1} {
    untested "failed to compile standalone testcase"
    return
}

if {[build_shared_jit] == -1} {
    untested "failed to compile shared library testcase"
    return
}

# Built the program that loads the JIT library.
set srcfile_dl $testfile-dl.c
set binfile_dl $binfile-dl
set options [list debug shlib=${binfile_lib}]
if {[gdb_compile ${srcdir}/${subdir}/${srcfile_dl} $binfile_dl executable \
	 [list debug shlib=$binfile_lib]] == -1 } {
    untested "failed to compile"
    return -1
}

# STANDALONE is true when the JIT reader is included directly in the
# main program.  False when the JIT reader is in a separate shared
# library.  If CHANGE_ADDR is true, force changing the JIT descriptor
# changes address between runs.
proc jit_test_reread {standalone change_addr} {
    global testfile binfile subdir srcfile srcdir binfile_lib binfile_dl
    global hex

    with_test_prefix "initial run" {
	if {$standalone} {
	    clean_restart $binfile
	} else {
	    clean_restart $binfile_dl
	}

	runto_main

	set addr_before [get_hexadecimal_valueof "&__jit_debug_descriptor" 0 \
			     "get address of __jit_debug_descriptor"]

	gdb_test "maint info breakpoints" \
	    "jit events     keep y   $hex <__jit_debug_register_code>.*" \
	    "maint info breakpoints shows jit breakpoint"
    }

    with_test_prefix "second run" {
	# Ensure that the new executable is at least one second newer
	# than the old.  If the recompilation happens in the same
	# second, gdb might not reload the executable automatically.
	sleep 1

	if ${change_addr} {
	    set options "additional_flags=-DSPACER"
	    if {$standalone} {
		gdb_rename_execfile $binfile ${binfile}x
		set res [build_standalone_jit $options]
	    } else {
		gdb_rename_execfile $binfile_lib ${binfile_lib}x
		set res [build_shared_jit $options]
	    }
	    if  { $res == -1 } {
		fail "recompile"
		return
	    } else {
		pass "recompile"
	    }
	}

	runto_main

	set addr_after [get_hexadecimal_valueof "&__jit_debug_descriptor" 0 \
			    "get address of __jit_debug_descriptor"]

	# This used to crash in the JIT-in-shared-library case:
	# https://sourceware.org/bugzilla/show_bug.cgi?id=11094
	gdb_test "maint info breakpoints" \
	    "jit events     keep y   $hex <__jit_debug_register_code>.*" \
	    "maint info breakpoints shows jit breakpoint"
    }

    if ${change_addr} {
	gdb_assert {$addr_before != $addr_after} "address changed"
    } else {
	gdb_assert {$addr_before == $addr_after} "address didn't change"
    }
}

foreach standalone {1 0} {
    with_test_prefix [expr ($standalone)?"standalone":"shared"] {
	with_test_prefix "change addr" {
	    jit_test_reread $standalone 1
	}
	with_test_prefix "same addr" {
	    jit_test_reread $standalone 0
	}
    }
}