# Copyright 2016-2021 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/>.

# Auxiliary function to set the language to Rust.
# The result is 1 (true) for success, 0 (false) for failure.
proc set_lang_rust {} {
    if [gdb_test_no_output "set language rust"] {
	return 0
    }
    if [gdb_test "show language" ".* source language is \"rust\"." \
	   "set language to \"rust\""] {
	return 0
    }
    return 1
}

proc gdb_compile_rust {sources dest options} {
    set res -1

    if {[llength $sources] > 1} {
	error "gdb rust setup can only compile one source file at a time"
    }

    global board
    set board [target_info name]
    set multilib_flags_orig [board_info $board multilib_flags]
    set multilib_flags {}
    foreach op $multilib_flags_orig {
	# Pretend rustc supports -pie/-no-pie/-fPIE/-fno-PIE.
	switch $op {
	    "-pie" - "-no-pie" {
		# Pass it to linker.
		lappend multilib_flags -C link-arg=$op
	    }
	    "-fno-PIE" {
		# Translate to rustc codegen equivalent.

		# The rustc documentation insists that we should use static
		# here, but that causes segfaults leading to:
		# UNTESTED: gdb.rust/rawids.exp: could not run to breakpoint
		# UNTESTED: gdb.rust/pp.exp: could not run to breakpoint
		# Instead, we use dynamic-no-pic which does seem to work.
		lappend multilib_flags -C relocation-model=dynamic-no-pic
	    }
	    "-fPIE" {
		# Translate to rustc codegen equivalent.
		lappend multilib_flags -C relocation-model=pic
	    }
	    default {
		# Pass unmodified.
		lappend multilib_flags $op
	    }
	}
    }

    save_target_board_info { multilib_flags } {
	unset_board_info multilib_flags
	set_board_info multilib_flags "$multilib_flags"
	if {[gdb_compile [lindex $sources 0] $dest executable \
		 $options] == ""} {
	    set res ""
	}
    }

    return $res
}

# Return the version of LLVM used by the Rust compiler.  Note that
# older versions of rustc don't print this -- in this case the
# returned version is "0.0".
gdb_caching_proc rust_llvm_version {
    set rustc [find_rustc]
    if {$rustc == ""} {
	verbose "could not find rustc"
    } else {
	set output [lindex [remote_exec host "$rustc --version --verbose"] 1]
	foreach line [split $output \n] {
	    if {[regexp "LLVM version: (.+)\$" $output ignore version]} {
		return $version
	    }
	}
	verbose "could not match rustc version output: $output"
    }
    return 0.0
}

# Return the version of the Rust compiler.
gdb_caching_proc rust_compiler_version {
    set rustc [find_rustc]
    if {$rustc == ""} {
	verbose "could not find rustc"
    } else {
	set output [lindex [remote_exec host "$rustc --version --verbose"] 1]
	foreach line [split $output \n] {
	    if {[regexp "rustc (\[0-9.\]+) .*\$" $output ignore version]} {
		return $version
	    }
	}
	verbose "could not match rustc version output: $output"
    }
    return 0.0
}