# Copyright 2014-2017 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/>.

# Generate a test program containing DTrace USDT probes, whose sources
# are ${srcfile} and ${testfile}.d.  The sequence of commands used to
# generate the test program is:
#
# 1. Generate a header file from ${testfile}.d using dtrace -h.
# 2. Compile ${srcfile}.c.
# 3. Generate an object file containing a DOF program using dtrace -G.
# 4. Link everything together to get the test program.
#
# Note that if DTrace is not found in the host system then this
# function uses the pdtrace implementation, which is located at
# testsuite/lib/pdtrace.
#
# This function requires 'testfile', 'srcfile' and 'binfile' to be
# properly set.
#
# This function returns -1 on failure, 0 otherwise
proc dtrace_build_usdt_test_program {} {
    global testfile hex objdir srcdir srcfile subdir binfile
    
    # Make sure that dtrace is installed, it is the real one (not the
    # script installed by SystemTap, for example) and of the right
    # version (>= 0.4.0).  If it is not then use pdtrace instead.
    set dtrace "dtrace"
    set result [remote_exec host "$dtrace -V"]
    if {[lindex $result 0] != 0 || ![regexp {^dtrace: Sun D [0-9]\.[0-9]\.[0-9]} [lindex $result 1]]} {
	set dtrace "${objdir}/lib/pdtrace"
    }
    set dscript_file "${srcdir}/${subdir}/${testfile}.d"

    # 1. Generate a header file from testprogram.d using dtrace -h.
    set out_header_file [standard_output_file "${testfile}.h"]
    set result [remote_exec host "$dtrace -h -s $dscript_file -o $out_header_file"]
    verbose -log [lindex $result 1]
    if {[lindex $result 0] != 0} {
        return -1
    }

    # 2. Compile testprogram.c.
    set options [list debug additional_flags=-I[file dirname $out_header_file]]
    if {[gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}.o" object ${options}] != ""} {
        return -1
    }

    # 3. Generate an object file containing a DOF program using dtrace -G.
    set result [remote_exec host "$dtrace -G -s $dscript_file -o ${binfile}-p.o ${binfile}.o"]
    verbose -log [lindex $result 1]
    if {[lindex $result 0] != 0} {
        return -1
    }

    # 4. Link everything together to get the test program.
    if {[gdb_compile "${binfile}.o ${binfile}-p.o" ${binfile} executable {debug}] != ""} {
        return -1
    }
}