gcc/testsuite/lib/scanasm.exp

# Copyright (C) 2000-2021 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 GCC; see the file COPYING3.  If not see
# <http://www.gnu.org/licenses/>.

# Various utilities for scanning assembler output, used by gcc-dg.exp and
# g++-dg.exp.

# Utility for scanning compiler result, invoked via dg-final.

# Transform newline and similar characters into their escaped form.
proc make_pattern_printable { pattern } {
    return [string map {\t \\t \n \\n \r \\r \\ \\\\} $pattern]
}

# Scan the OUTPUT_FILE for a pattern.  If it is present and POSITIVE
# is non-zero, or it is not present and POSITIVE is zero, the test
# passes.  The ORIG_ARGS is the list of arguments provided by dg-final
# to scan-assembler.  The first element in ORIG_ARGS is the regular
# expression to look for in the file.  The second element, if present,
# is a DejaGNU target selector.

proc dg-scan { name positive testcase output_file orig_args } {
    if { [llength $orig_args] < 1 } {
	error "$name: too few arguments"
        return
    }
    if { [llength $orig_args] > 2 } {
	error "$name: too many arguments"
	return
    }
    if { [llength $orig_args] >= 2 } {
	switch [dg-process-target [lindex $orig_args 1]] {
	    "S" { }
	    "N" { return }
	    "F" { setup_xfail "*-*-*" }
	    "P" { }
	}
    }

    set pattern [lindex $orig_args 0]
    set printable_pattern [make_pattern_printable $pattern]

    set files [dg_glob_remote $output_file]
    if { $files == "" } {
	verbose -log "$testcase: output file does not exist"
	unresolved "$testcase $name $printable_pattern"
	return
    }
    set fd [open $output_file r]
    set text [read $fd]
    close $fd

    set match [regexp -- $pattern $text]
    if { $match == $positive } {
	pass "$testcase $name $printable_pattern"
    } else {
	fail "$testcase $name $printable_pattern"
    }
}

proc dg_glob_remote { file_pattern } {
    if { [is_remote host] } {
    remote_upload host $file_pattern
    }
    return [glob -nocomplain $file_pattern]
}

# Look for a pattern in the .s file produced by the compiler.  See
# dg-scan for details.

proc scan-assembler { args } {
    set testcase [testname-for-summary]
    # The name might include a list of options; extract the file name.
    set filename [lindex $testcase 0]
    set output_file "[file rootname [file tail $filename]].s"
    dg-scan "scan-assembler" 1 $testcase $output_file $args
}

force_conventional_output_for scan-assembler

# Check that a pattern is not present in the .s file produced by the
# compiler.  See dg-scan for details.

proc scan-assembler-not { args } {
    set testcase [testname-for-summary]
    # The name might include a list of options; extract the file name.
    set filename [lindex $testcase 0]
    set output_file "[file rootname [file tail $filename]].s"

    dg-scan "scan-assembler-not" 0 $testcase $output_file $args
}

force_conventional_output_for scan-assembler-not

# Return the scan for the assembly for hidden visibility. 

proc hidden-scan-for { symbol } {

    set objformat [gcc_target_object_format]

    switch $objformat {
        coff     { return "$symbol\[,\d\]*hidden" }
        elf      { return "hidden\[ \t_\]*$symbol" }
        mach-o   { return "private_extern\[ \t_\]*_?$symbol" }
        default  { return "" }
    }

}


# Check that a symbol is defined as a hidden symbol in the .s file
# produced by the compiler.

proc scan-hidden { args } {
    set testcase [testname-for-summary]
    # The name might include a list of options; extract the file name.
    set filename [lindex $testcase 0]
    set output_file "[file rootname [file tail $filename]].s"

    if { [llength $args] > 0 } {
	set symbol [lindex $args 0]

	set hidden_scan [hidden-scan-for $symbol]

	set args [lreplace $args 0 0 "$hidden_scan"]
    }

    dg-scan "scan-hidden" 1 $testcase $output_file $args
}

# Check that a symbol is not defined as a hidden symbol in the .s file
# produced by the compiler.

proc scan-not-hidden { args } {
    set testcase [testname-for-summary]
    # The name might include a list of options; extract the file name.
    set filename [lindex $testcase 0]
    set output_file "[file rootname [file tail $filename]].s"

    if { [llength $args] > 0 } {
	set symbol [lindex $args 0]
	set hidden_scan [hidden-scan-for $symbol]

	set args [lreplace $args 0 0 "$hidden_scan"]
    }

    dg-scan "scan-not-hidden" 0 $testcase $output_file $args
}

# Check that symbols are emitted in the desired section.
# Like scan-symbol-section, but using the assembly output generated by
# the compiler.
#
# Example:
#
# // All numbered functions (func1, func2, etc.) must be in the .text section or
# // in a .text sub-section (like .text._func1).
# { dg-final { scan-assembler-symbol-section {^_func[1-5]$} {^\.text($|\.)} } }

proc scan-assembler-symbol-section { args } {
    set testcase [testname-for-summary]
    set filename [lindex $testcase 0]
    set output_file "[file rootname [file tail $filename]].s"
    dg-scan-symbol-section \
	"scan-assembler-symbol-section" $testcase $output_file $args
}

# Check that symbols are emitted in the desired section.
#
# Symbols and sections are interpreted as regexp patterns.
#
# If no matching symbol is found, scan-symbol-section reports a FAILure.
#
# Usage:
#
# { dg-final { scan-symbol-section FILENAME SYMBOL SECTION } }
#
# Examples:
#
# // The my_var C symbol must be in the .data section (or in a .data._my_var section
# // if -ffunction-sections is in use).
# { dg-final { scan-symbol-section "my-test.s" {^_my_var$} {^\.data(\._my_var)?$} } }
#
# // All numbered functions (func1, func2, etc.) must be in the .text section
# // (and not in any other section like .text._func1).
# { dg-final { scan-symbol-section "my-test.s" {^_func[1-5]$} {^\.text$} } }
#
# Caveats:
#
# * Only ELF and Mach-O targets are supported. Other
#   targets, like PE/COFF, might appear to work.
# * For Mach-O targets, the section name matched by scan-symbol-section has one
#   of two forms:
#   * The Mach-O segment name followed by a comma (',') followed by the Mach-O
#     section name. For example, "__TEXT,__text". (There is no whitespace
#     between the Mach-O segment name and the Mach-O section name.)
#   * ".const", ".data", or ".text". For example, the .text assembler directive
#     causes the section name to be ".text" (not "__TEXT,__text"). (However, a
#     directive such as .section __TEXT,__text will cause the section name to be
#     "__TEXT,__text".)
# * Because scan-symbol-section parses assembly code, scan-symbol-section is
#   unaware of section rewriting performed by the linker. For example, the
#   sections .text._f1 and .text._f2 would normally be merged by binutils'
#   linker into one section called .text, but scan-symbol-section reports the
#   sections as .text._f1 and .text._f2 (and not .text).
# * The symbol pattern matches any assembly label, including local labels which
#   begin with `.L`.

proc scan-symbol-section { args } {
    set testcase [testname-for-summary]
    set output_file [lindex $args 0]
    dg-scan-symbol-section \
	"scan-symbol-section" $testcase $output_file $args
}

# Check that symbols are emitted in the desired section.  The ORIG_ARGS is
# the list of arguments provided by dg-final to scan-symbol-section or
# scan-assembler-symbol-section.  The first element in ORIG_ARGS is the
# regular expression to look for in the file.  The second element, if
# present, is a DejaGNU target selector.
#
# Avoid calling this function directly.  In tests, use scan-symbol-section,
# scan-assembler-symbol-section, or scan-lto-assembler-symbol-section instead.

proc dg-scan-symbol-section { name testcase output_file orig_args } {
    if { [llength $orig_args] < 2 } {
	error "$name: too few arguments"
        return
    }
    if { [llength $orig_args] > 4 } {
	error "$name: too many arguments"
	return
    }
    switch $name {
	"scan-symbol-section" { set arg_incr 1 }
	default { set arg_incr 0 }
    }
    if { [llength $orig_args] >= 3 } {
	switch [dg-process-target [lindex $orig_args [expr 2 + $arg_incr]]] {
	    "S" { }
	    "N" { return }
	    "F" { setup_xfail "*-*-*" }
	    "P" { }
	}
    }

    set symbol_pattern [lindex $orig_args [expr 0 + $arg_incr]]
    set expected_section_pattern [lindex $orig_args [expr 1 + $arg_incr]]

    set printable_symbol_pattern [make_pattern_printable $symbol_pattern]
    set printable_expected_section_pattern [make_pattern_printable $expected_section_pattern]

    set files [dg_glob_remote $output_file]
    if { $files == "" } {
    verbose -log "$testcase: output file does not exist"
    unresolved "$testcase $name symbol $printable_symbol_pattern has section $printable_expected_section_pattern"
    return
    }

    parse_section_of_symbols $output_file section_by_symbol

    set found_symbol 0
    foreach symbol_name [lsort [array names section_by_symbol]] {
        if { [regexp -- $symbol_pattern $symbol_name] } {
            set section $section_by_symbol($symbol_name)
	    if { [istarget powerpc*-*-*] && $section == ".opd" } {
		set section $section_by_symbol(.L.$symbol_name)
	    }
            set description "$testcase $name symbol $printable_symbol_pattern (found $symbol_name) has section $printable_expected_section_pattern"
            if { $section == "" } {
                fail "$description (no section detected)"
            } else {
                set description "$description (found $section)"
                if { [regexp -- $expected_section_pattern $section] } {
                    pass $description
                } else {
                    fail $description
                }
            }
            set found_symbol 1
        }
    }
    if { ! $found_symbol } {
        fail "$testcase $name symbol $printable_symbol_pattern (symbol not found) has section $printable_expected_section_pattern"
    }
}

# Extract a symbol and section names from pre-processed assembly source code.
#
# This function adds entries in the RESULT array where the key is the symbol's
# name (including any leading underscores) and the value is the section's name
# (including any leading periods).
#
# For example, given the following assembly source code in file.s:
#
#         .text
#         .function _my_function
# _my_function:
#         nop
#         .data
# _my_data:
#         .long 42
#
# Executing 'parse_section_of_symbols "file.s" symbols' would have the same
# effect as the following code:
#
# set $result(_my_function) .text
# set $result(_my_data) .data

proc parse_section_of_symbols { filename result } {
    upvar $result up_result

    set section_pattern {^\s*(?:(?:\.section|\.csect)\s+(.*)|(\.const|\.data|\.text)\s*)$}
    set label_pattern {^(\S+):$}
    set previous_pattern {^\s*\.previous\s*$}

    set fd [open $filename r]
    set current_section ""
    set prev_section ""
    while { [gets $fd line] >= 0 } {
        if { [regexp -- $label_pattern $line dummy symbol_name] } {
            set up_result($symbol_name) $current_section
        } elseif { [regexp -- $section_pattern $line dummy section_directive_arguments full_section_directive] } {
	    set prev_section $current_section
            if { $full_section_directive eq "" } {
                # Example: .section .text,"ax",progbits
                # Example: .section ".text",#alloc,#execinstr,#progbits
                # Example: .section __TEXT,__text
                set arguments [split $section_directive_arguments ","]
                set current_section [string trim [lindex $arguments 0]]
                set current_section [string trim $current_section {"}]
                set arg_1 [string trim [lindex $arguments 1]]
                if { [regexp {^_} $arg_1] } {
                    # The second argument looks like a Mach-O section name.
                    set current_section "$current_section,$arg_1"
                }
            } else {
                # Example: .text
                set current_section "$full_section_directive"
            }
	} elseif { [regexp -- $previous_pattern $line dummy] } {
	    set sect $prev_section
	    set prev_section $current_section
	    set current_section $sect
	}
    }
    close $fd
}

# Look for a pattern in OUTPUT_FILE.  See dg-scan for details.

proc scan-file { output_file args } {
    set testcase [testname-for-summary]
    dg-scan "scan-file" 1 $testcase $output_file $args
}

# Check that a pattern is not present in the OUTPUT_FILE.  See dg-scan
# for details.

proc scan-file-not { output_file args } {
    set testcase [testname-for-summary]
    dg-scan "scan-file-not" 0 $testcase $output_file $args
}

# Look for a pattern in the .su file produced by the compiler.  See
# dg-scan for details.

proc scan-stack-usage { args } {
    set testcase [testname-for-summary]
    # The name might include a list of options; extract the file name.
    set filename [lindex $testcase 0]
    set output_file "[file rootname [file tail $filename]].su"

    dg-scan "scan-stack-usage" 1 $testcase $output_file $args
}

# Check that a pattern is not present in the .su file produced by the
# compiler.  See dg-scan for details.

proc scan-stack-usage-not { args } {
    set testcase [testname-for-summary]
    # The name might include a list of options; extract the file name.
    set filename [lindex $testcase 0]
    set output_file "[file rootname [file tail $filename]].su"

    dg-scan "scan-stack-usage-not" 0 $testcase $output_file $args
}

# Return the filename of the Ada spec corresponding to the argument.

proc get_ada_spec_filename { testcase } {
    # The name might include a list of options; extract the file name.
    set filename  [lindex $testcase 0]
    set tailname  [file tail $filename]
    set extension [string trimleft [file extension $tailname] {.}]
    regsub -all {\-} [file rootname $tailname] {_} rootname

    return [string tolower "${rootname}_${extension}.ads"]
}

# Look for a pattern in the .ads file produced by the compiler.  See
# dg-scan for details.

proc scan-ada-spec { args } {
    set testcase  [testname-for-summary]
    set output_file "[get_ada_spec_filename $testcase]"

    dg-scan "scan-ada-spec" 1 $testcase $output_file $args
}

# Check that a pattern is not present in the .ads file produced by the
# compiler.  See dg-scan for details.

proc scan-ada-spec-not { args } {
    set testcase  [testname-for-summary]
    set output_file "[get_ada_spec_filename $testcase]"

    dg-scan "scan-ada-spec-not" 0 $testcase $output_file $args
}

# Call pass if pattern is present given number of times, otherwise fail.
proc scan-assembler-times { args } {
    if { [llength $args] < 2 } {
	error "scan-assembler-times: too few arguments"
        return
    }
    if { [llength $args] > 3 } {
	error "scan-assembler-times: too many arguments"
	return
    }
    if { [llength $args] >= 3 } {
	switch [dg-process-target [lindex $args 2]] {
	    "S" { }
	    "N" { return }
	    "F" { setup_xfail "*-*-*" }
	    "P" { }
	}
    }

    set testcase [testname-for-summary]
    # The name might include a list of options; extract the file name.
    set filename [lindex $testcase 0]
    set pattern [lindex $args 0]
    set times [lindex $args 1]
    set pp_pattern [make_pattern_printable $pattern]

    # This must match the rule in gcc-dg.exp.
    set output_file "[file rootname [file tail $filename]].s"

    set files [glob -nocomplain $output_file]
    if { $files == "" } {
	verbose -log "$testcase: output file does not exist"
	unresolved "$testcase scan-assembler-times $pp_pattern $times"
	return
    }

    set fd [open $output_file r]
    set text [read $fd]
    close $fd

    set result_count [llength [regexp -inline -all -- $pattern $text]]
    if {$result_count == $times} {
	pass "$testcase scan-assembler-times $pp_pattern $times"
    } else {
	verbose -log "$testcase: $pp_pattern found $result_count times"
	fail "$testcase scan-assembler-times $pp_pattern $times"
    }
}

force_conventional_output_for scan-assembler-times

# Utility for scanning demangled compiler result, invoked via dg-final.
# Call pass if pattern is present, otherwise fail.
proc scan-assembler-dem { args } {
    global cxxfilt
    global base_dir

    if { [llength $args] < 1 } {
	error "scan-assembler-dem: too few arguments"
        return
    }
    if { [llength $args] > 2 } {
	error "scan-assembler-dem: too many arguments"
	return
    }
    if { [llength $args] >= 2 } {
	switch [dg-process-target [lindex $args 1]] {
	    "S" { }
	    "N" { return }
	    "F" { setup_xfail "*-*-*" }
	    "P" { }
	}
    }

    # Find c++filt like we find g++ in g++.exp.
    if ![info exists cxxfilt]  {
	set cxxfilt [findfile $base_dir/../../../binutils/cxxfilt \
		     $base_dir/../../../binutils/cxxfilt \
	             [findfile $base_dir/../../c++filt $base_dir/../../c++filt \
		      [findfile $base_dir/c++filt $base_dir/c++filt \
		       [transform c++filt]]]]
	verbose -log "c++filt is $cxxfilt"
    }

    set testcase [testname-for-summary]
    # The name might include a list of options; extract the file name.
    set filename [lindex $testcase 0]
    set pattern [lindex $args 0]
    set pp_pattern [make_pattern_printable $pattern]
    set output_file "[file rootname [file tail $filename]].s"

    set files [glob -nocomplain $output_file]
    if { $files == "" } {
	verbose -log "$testcase: output file does not exist"
	unresolved "$testcase scan-assembler-dem $pp_pattern"
	return
    }

    set output [remote_exec host "$cxxfilt" "" "$output_file"]
    set text [lindex $output 1]

    if [regexp -- $pattern $text] {
	pass "$testcase scan-assembler-dem $pp_pattern"
    } else {
	fail "$testcase scan-assembler-dem $pp_pattern"
    }
}

# Call pass if demangled pattern is not present, otherwise fail.
proc scan-assembler-dem-not { args } {
    global cxxfilt
    global base_dir

    if { [llength $args] < 1 } {
	error "scan-assembler-dem-not: too few arguments"
        return
    }
    if { [llength $args] > 2 } {
	error "scan-assembler-dem-not: too many arguments"
	return
    }
    if { [llength $args] >= 2 } {
	switch [dg-process-target [lindex $args 1]] {
	    "S" { }
	    "N" { return }
	    "F" { setup_xfail "*-*-*" }
	    "P" { }
	}
    }

    # Find c++filt like we find g++ in g++.exp.
    if ![info exists cxxfilt]  {
	set cxxfilt [findfile $base_dir/../../../binutils/cxxfilt \
		     $base_dir/../../../binutils/cxxfilt \
		     [findfile $base_dir/../../c++filt $base_dir/../../c++filt \
		      [findfile $base_dir/c++filt $base_dir/c++filt \
		       [transform c++filt]]]]
	verbose -log "c++filt is $cxxfilt"
    }

    set testcase [testname-for-summary]
    # The name might include a list of options; extract the file name.
    set filename [lindex $testcase 0]
    set pattern [lindex $args 0]
    set pp_pattern [make_pattern_printable $pattern]
    set output_file "[file rootname [file tail $filename]].s"

    set files [glob -nocomplain $output_file]
    if { $files == "" } {
	verbose -log "$testcase: output file does not exist"
	unresolved "$testcase scan-assembler-dem-not $pp_pattern"
	return
    }

    set output [remote_exec host "$cxxfilt" "" "$output_file"]
    set text [lindex $output 1]

    if ![regexp -- $pattern $text] {
	pass "$testcase scan-assembler-dem-not $pp_pattern"
    } else {
	fail "$testcase scan-assembler-dem-not $pp_pattern"
    }
}

# Call pass if object size is ok, otherwise fail.
# example: /* { dg-final { object-size text <= 54 } } */
proc object-size { args } {
    global size
    global base_dir

    if { [llength $args] < 3 } {
	error "object-size: too few arguments"
        return
    }
    if { [llength $args] > 4 } {
	error "object-size: too many arguments"
	return
    }
    if { [llength $args] >= 4 } {
	switch [dg-process-target [lindex $args 3]] {
	    "S" { }
	    "N" { return }
	    "F" { setup_xfail "*-*-*" }
	    "P" { }
	}
    }

    # Find size like we find g++ in g++.exp.
    if ![info exists size]  {
	set size [findfile $base_dir/../../../binutils/size \
		  $base_dir/../../../binutils/size \
		  [findfile $base_dir/../../size $base_dir/../../size \
		   [findfile $base_dir/size $base_dir/size \
		    [transform size]]]]
	verbose -log "size is $size"
    }

    set testcase [testname-for-summary]
    # The name might include a list of options; extract the file name.
    set filename [lindex $testcase 0]
    set what [lindex $args 0]
    set where [lsearch { text data bss total } $what]
    if { $where == -1 } {
        error "object-size: illegal argument: $what"
        return
    }
    set cmp [lindex $args 1]
    if { [lsearch { < > <= >= == != } $cmp] == -1 } {
        error "object-size: illegal argument: $cmp"
        return
    }
    set with [lindex $args 2]
    if ![string is integer $with ] {
        error "object-size: illegal argument: $with"
        return
    }

    set output_file "[file rootname [file tail $filename]].o"
    if ![file_on_host exists $output_file] {
	verbose -log "$testcase: $output_file does not exist"
	unresolved "$testcase object-size $what $cmp $with"
	return
    }
    set output [remote_exec host "$size" "$output_file"]
    set status [lindex $output 0]
    if { $status != 0 } {
        verbose -log "$testcase object-size: $size failed"
        unresolved "$testcase object-size $what $cmp $with"
        return
    }

    set text [lindex $output 1]
    set lines [split $text "\n"]

    set l0match {^\s*text\s+data\s+bss\s+dec\s+hex\s+filename\s*$}
    set l1match {^\s*\d+\s+\d+\s+\d+\s+\d+\s+[\da-fA-F]+\s+}

    if { [istarget *-*-darwin*] } {
      set l0match {^\s*__TEXT\s+__DATA\s+__OBJC\s+others\s+dec\s+hex\s*$}
      set l1match {^\s*\d+\s+\d+\s+\d+\s+\d+\s+\d+\s+[\da-fA-F]+\s+}
    }

    set line0 [lindex $lines 0]
    if ![regexp $l0match $line0] {
        verbose -log "$testcase object-size: $size did not produce expected first line: $line0"
        unresolved "$testcase object-size $what $cmp $with"
        return
    }

    set line1 [lindex $lines 1]
    if ![regexp $l1match $line1] {
        verbose -log "$testcase object-size: $size did not produce expected second line: $line1"
        unresolved "$testcase object-size $what $cmp $with"
        return
    }

    set actual [lindex $line1 $where]
    verbose -log "$what size is $actual"

    if [expr $actual $cmp $with] {
	pass "$testcase object-size $what $cmp $with"
    } else {
	fail "$testcase object-size $what $cmp $with"
    }
}

# Utility for testing that a function is defined on the current line.
# Call pass if so, otherwise fail.  Invoked directly; the file must
# have been compiled with -g -dA.
#
# Argument 0 is the current line, passed implicitly by dejagnu
# Argument 1 is the function to check
# Argument 2 handles expected failures and the like
# Argument 3 is "." to match the current line, or an integer to match
# an explicit line.
proc dg-function-on-line { args } {
    # Upvar from dg-final:
    upvar dg-final-code final-code

    set line [lindex $args 0]
    set symbol [lindex $args 1]
    set failures [lindex $args 2]

    if { [llength $args] >= 4 } {
	switch [lindex $args 3] {
	    "." { }
	    "default" { set line [lindex $args 3] }
	}
    }

    if { [istarget hppa*-*-linux*] } {
	set pattern [format {%s:\n\t.PROC\n\t.CALLINFO.*\n\t.ENTRY\n.L.*:\n(\t.file[^\t]*)*\t[^:]+:%d(:[0-9]+)?\n} \
                     $symbol $line]
    } elseif { [istarget hppa*-*-*] } {
	set pattern [format {\t;[^:]+:%d(:[0-9]+)?\n(\t[^\t]+\n)+%s:\n\t.PROC} \
                     $line $symbol]
    } elseif { [istarget mips*-*-*] } {
	set pattern [format {\t\.loc [0-9]+ %d [0-9]+( [^\n]*)?\n(\t.cfi_startproc[^\t]*\n)*\t\.set\t(no)?mips16\n\t(\.set\t(no)?micromips\n\t)?\.ent\t%s\n\t\.type\t%s, @function\n%s:\n} \
		     $line $symbol $symbol $symbol]
    } elseif { [istarget microblaze*-*-*] } {
        set pattern [format {:%d(:[0-9]+)?\n\$.*:\n\t\.ent\t%s\n\t\.type\t%s, @function\n%s:\n} \
                     $line $symbol $symbol $symbol]
    } else {
	set pattern [format {%s:[^\t]*(\t.(fnstart|frame|mask|file)[^\t]*)*\t[^:]+:%d(:[0-9]+)?\n} \
                     $symbol $line]
    }

    # The lack of spaces around $pattern is important, since they'd
    # become part of the regex scan-assembler tries to match.
    set cmd "scan-assembler {$pattern}"
    if { [llength $args] >= 3 } {
        set cmd "$cmd {$failures}"
    }

    append final-code "$cmd\n"
}

# Look for a pattern in the .exe.ltrans0.s file produced by the
# compiler.  See dg-scan for details.

proc scan-lto-assembler { args } {
    set testcase [testname-for-summary]
    # The name might include a list of options; extract the file name.
    set filename [lindex $testcase 0]
    set output_file "[file rootname [file tail $filename]].ltrans0.ltrans.s"
    verbose "output_file: $output_file"
    dg-scan "scan-lto-assembler" 1 $testcase $output_file $args
}

# Read assembly file FILENAME and store a mapping from function names
# to function bodies in array RESULT.  FILENAME has already been uploaded
# locally where necessary and is known to exist.

proc parse_function_bodies { filename result } {
    upvar $result up_result

    # Regexp for the start of a function definition (name in \1).
    set label {^([a-zA-Z_]\S+):$}

    # Regexp for the end of a function definition.
    set terminator {^\s*\.size}

    # Regexp for lines that aren't interesting.
    set fluff {^\s*(?:\.|//|@)}

    set fd [open $filename r]
    set in_function 0
    while { [gets $fd line] >= 0 } {
	if { [regexp $label $line dummy function_name] } {
	    set in_function 1
	    set function_body ""
	} elseif { $in_function } {
	    if { [regexp $terminator $line] } {
		set up_result($function_name) $function_body
		set in_function 0
	    } elseif { ![regexp $fluff $line] } {
		append function_body $line "\n"
	    }
	}
    }
    close $fd
}

# FUNCTIONS is an array that maps function names to function bodies.
# Return true if it contains a definition of function NAME and if
# that definition matches BODY_REGEXP.

proc check_function_body { functions name body_regexp } {
    upvar $functions up_functions

    if { ![info exists up_functions($name)] } {
	return 0
    }
    return [regexp "^$body_regexp\$" $up_functions($name)]
}

# Check the implementations of functions against expected output.  Used as:
#
# { dg-do { check-function-bodies PREFIX TERMINATOR[ OPTION[ SELECTOR]] } }
#
# See sourcebuild.texi for details.

proc check-function-bodies { args } {
    if { [llength $args] < 2 } {
	error "too few arguments to check-function-bodies"
    }
    if { [llength $args] > 4 } {
	error "too many arguments to check-function-bodies"
    }

    if { [llength $args] >= 3 } {
	set required_flags [lindex $args 2]

	upvar 2 dg-extra-tool-flags extra_tool_flags
	set flags $extra_tool_flags

	global torture_current_flags
	if { [info exists torture_current_flags] } {
	    append flags " " $torture_current_flags
	}
	foreach required_flag $required_flags {
	    switch -- $required_flag {
		target -
		xfail {
		    error "misplaced $required_flag in check-function-bodies"
		}
	    }
	}
	foreach required_flag $required_flags {
	    if { ![regexp " $required_flag " $flags] } {
		return
	    }
	}
    }

    set xfail_all 0
    if { [llength $args] >= 4 } {
	switch [dg-process-target [lindex $args 3]] {
	    "S" { }
	    "N" { return }
	    "F" { set xfail_all 1 }
	    "P" { }
	}
    }

    set testcase [testname-for-summary]
    # The name might include a list of options; extract the file name.
    set filename [lindex $testcase 0]

    global srcdir
    set input_filename "$srcdir/$filename"
    set output_filename "[file rootname [file tail $filename]].s"

    set prefix [lindex $args 0]
    set prefix_len [string length $prefix]
    set terminator [lindex $args 1]
    if { [string equal $terminator ""] } {
	set terminator "*/"
    }
    set terminator_len [string length $terminator]

    set have_bodies 0
    if { [is_remote host] } {
	remote_upload host "$filename"
    }
    if { [file exists $output_filename] } {
	parse_function_bodies $output_filename functions
	set have_bodies 1
    } else {
	verbose -log "$testcase: output file does not exist"
    }

    set count 0
    set function_regexp ""
    set label {^(\S+):$}

    set lineno 1
    set fd [open $input_filename r]
    set in_function 0
    while { [gets $fd line] >= 0 } {
	if { [string equal -length $prefix_len $line $prefix] } {
	    set line [string trim [string range $line $prefix_len end]]
	    if { !$in_function } {
		if { [regexp "^(.*?\\S)\\s+{(.*)}\$" $line dummy \
			  line selector] } {
		    set selector [dg-process-target $selector]
		} else {
		    set selector "P"
		}
		if { ![regexp $label $line dummy function_name] } {
		    close $fd
		    error "check-function-bodies: line $lineno does not have a function label"
		}
		set in_function 1
		set function_regexp ""
	    } elseif { [string equal $line "("] } {
		append function_regexp "(?:"
	    } elseif { [string equal $line "|"] } {
		append function_regexp "|"
	    } elseif { [string equal $line ")"] } {
		append function_regexp ")"
	    } elseif { [string equal $line "..."] } {
		append function_regexp ".*"
	    } else {
		append function_regexp "\t" $line "\n"
	    }
	} elseif { [string equal -length $terminator_len $line $terminator] } {
	    if { ![string equal $selector "N"] } {
		if { $xfail_all || [string equal $selector "F"] } {
		    setup_xfail "*-*-*"
		}
		set testname "$testcase check-function-bodies $function_name"
		if { !$have_bodies } {
		    unresolved $testname
		} elseif { [check_function_body functions $function_name \
				$function_regexp] } {
		    pass $testname
		} else {
		    fail $testname
		}
	    }
	    set in_function 0
	    incr count
	}
	incr lineno
    }
    close $fd
    if { $in_function } {
	error "check-function-bodies: missing \"$terminator\""
    }
    if { $count == 0 } {
	error "check-function-bodies: no matches found"
    }
}