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#!/usr/bin/perl
# Copyright (C) 2013-2018 Free Software Foundation, Inc.
#
# This file is part of GDB.
#
# 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/>.
# Usage:
# make-target-delegates target.h > target-delegates.c
# The line we search for in target.h that marks where we should start
# looking for methods.
$TRIGGER = qr,^struct target_ops$,;
# The end of the methods part.
$ENDER = qr,^\s*};$,;
# Match a C symbol.
$SYMBOL = qr,[a-zA-Z_][a-zA-Z0-9_]*,;
# Match the name part of a method in struct target_ops.
$NAME_PART = qr,\(\*(?<name>${SYMBOL}+)\)\s,;
# Match the arguments to a method.
$ARGS_PART = qr,(?<args>\(.*\)),;
# We strip the indentation so here we only need the caret.
$INTRO_PART = qr,^,;
# Match the return type when it is "ordinary".
$SIMPLE_RETURN_PART = qr,[^\(]+,;
# Match the return type when it is a VEC.
$VEC_RETURN_PART = qr,VEC\s*\([^\)]+\)[^\(]*,;
# Match the TARGET_DEFAULT_* attribute for a method.
$TARGET_DEFAULT_PART = qr,TARGET_DEFAULT_(?<style>[A-Z_]+)\s*\((?<default_arg>.*)\),;
# Match the arguments and trailing attribute of a method definition.
# Note we don't match the trailing ";".
$METHOD_TRAILER = qr,\s*${TARGET_DEFAULT_PART}$,;
# Match an entire method definition.
$METHOD = ($INTRO_PART . "(?<return_type>" . $SIMPLE_RETURN_PART
. "|" . $VEC_RETURN_PART . ")"
. $NAME_PART . $ARGS_PART
. $METHOD_TRAILER);
# Match TARGET_DEBUG_PRINTER in an argument type.
# This must match the whole "sub-expression" including the parens.
# Reference $1 must refer to the function argument.
$TARGET_DEBUG_PRINTER = qr,\s*TARGET_DEBUG_PRINTER\s*\(([^)]*)\)\s*,;
sub trim($) {
my ($result) = @_;
$result =~ s,^\s+,,;
$result =~ s,\s+$,,;
return $result;
}
# Read from the input files until we find the trigger line.
# Die if not found.
sub find_trigger() {
while (<>) {
chomp;
return if m/$TRIGGER/;
}
die "could not find trigger line\n";
}
# Scan target.h and return a list of possible target_ops method entries.
sub scan_target_h() {
my $all_the_text = '';
find_trigger();
while (<>) {
chomp;
# Skip the open brace.
next if /{/;
last if m/$ENDER/;
# Just in case somebody ever uses C99.
$_ =~ s,//.*$,,;
$_ = trim ($_);
$all_the_text .= $_;
}
# Now strip out the C comments.
$all_the_text =~ s,/\*(.*?)\*/,,g;
return split (/;/, $all_the_text);
}
# Parse arguments into a list.
sub parse_argtypes($) {
my ($typestr) = @_;
$typestr =~ s/^\((.*)\)$/\1/;
my (@typelist) = split (/,\s*/, $typestr);
my (@result, $iter, $onetype);
foreach $iter (@typelist) {
if ($iter =~ m/^(enum\s+${SYMBOL}\s*)(${SYMBOL})?$/) {
$onetype = $1;
} elsif ($iter =~ m/^(.*(enum\s+)?${SYMBOL}.*(\s|\*|&))${SYMBOL}+$/) {
$onetype = $1;
} elsif ($iter eq 'void') {
next;
} else {
$onetype = $iter;
}
push @result, trim ($onetype);
}
return @result;
}
sub dname($) {
my ($name) = @_;
$name =~ s/to_/delegate_/;
return $name;
}
# Write function header given name, return type, and argtypes.
# Returns a list of actual argument names.
sub write_function_header($$@) {
my ($name, $return_type, @argtypes) = @_;
print "static " . $return_type . "\n";
print $name . ' (';
my $iter;
my @argdecls;
my @actuals;
my $i = 0;
foreach $iter (@argtypes) {
my $val = $iter;
$val =~ s/$TARGET_DEBUG_PRINTER//;
if ($iter !~ m,(\*|&)$,) {
$val .= ' ';
}
my $vname;
if ($i == 0) {
# Just a random nicety.
$vname = 'self';
} else {
$vname .= "arg$i";
}
$val .= $vname;
push @argdecls, $val;
push @actuals, $vname;
++$i;
}
print join (', ', @argdecls) . ")\n";
print "{\n";
return @actuals;
}
# Write out a delegation function.
sub write_delegator($$@) {
my ($name, $return_type, @argtypes) = @_;
my (@names) = write_function_header (dname ($name), $return_type,
@argtypes);
print " $names[0] = $names[0]->beneath;\n";
print " ";
if ($return_type ne 'void') {
print "return ";
}
print "$names[0]->" . $name . " (";
print join (', ', @names);
print ");\n";
print "}\n\n";
}
sub tdname ($) {
my ($name) = @_;
$name =~ s/to_/tdefault_/;
return $name;
}
# Write out a default function.
sub write_tdefault($$$$@) {
my ($content, $style, $name, $return_type, @argtypes) = @_;
if ($style eq 'FUNC') {
return $content;
}
write_function_header (tdname ($name), $return_type, @argtypes);
if ($style eq 'RETURN') {
print " return $content;\n";
} elsif ($style eq 'NORETURN') {
print " $content;\n";
} elsif ($style eq 'IGNORE') {
# Nothing.
} else {
die "unrecognized style: $style\n";
}
print "}\n\n";
return tdname ($name);
}
sub munge_type($) {
my ($typename) = @_;
my ($result);
if ($typename =~ m/$TARGET_DEBUG_PRINTER/) {
$result = $1;
} else {
($result = $typename) =~ s/\s+$//;
$result =~ s/[ ()<>:]/_/g;
$result =~ s/[*]/p/g;
$result =~ s/&/r/g;
# Identifers with double underscores are reserved to the C++
# implementation.
$result =~ s/_+/_/g;
# Avoid ending the function name with underscore, for
# cosmetics. Trailing underscores appear after munging types
# with template parameters, like e.g. "foo<int>".
$result =~ s/_$//g;
$result = 'target_debug_print_' . $result;
}
return $result;
}
# Write out a debug method.
sub write_debugmethod($$$$@) {
my ($content, $style, $name, $return_type, @argtypes) = @_;
my ($debugname) = $name;
$debugname =~ s/to_/debug_/;
my ($targetname) = $name;
$targetname =~ s/to_/target_/;
my (@names) = write_function_header ($debugname, $return_type, @argtypes);
if ($return_type ne 'void') {
print " $return_type result;\n";
}
print " fprintf_unfiltered (gdb_stdlog, \"-> %s->$name (...)\\n\", debug_target.to_shortname);\n";
# Delegate to the beneath target.
print " ";
if ($return_type ne 'void') {
print "result = ";
}
print "debug_target." . $name . " (";
my @names2 = @names;
@names2[0] = "&debug_target";
print join (', ', @names2);
print ");\n";
# Now print the arguments.
print " fprintf_unfiltered (gdb_stdlog, \"<- %s->$name (\", debug_target.to_shortname);\n";
for my $i (0 .. $#argtypes) {
print " fputs_unfiltered (\", \", gdb_stdlog);\n" if $i > 0;
my $printer = munge_type ($argtypes[$i]);
print " $printer ($names2[$i]);\n";
}
if ($return_type ne 'void') {
print " fputs_unfiltered (\") = \", gdb_stdlog);\n";
my $printer = munge_type ($return_type);
print " $printer (result);\n";
print " fputs_unfiltered (\"\\n\", gdb_stdlog);\n";
} else {
print " fputs_unfiltered (\")\\n\", gdb_stdlog);\n";
}
if ($return_type ne 'void') {
print " return result;\n";
}
print "}\n\n";
return $debugname;
}
print "/* THIS FILE IS GENERATED -*- buffer-read-only: t -*- */\n";
print "/* vi:set ro: */\n\n";
print "/* To regenerate this file, run:*/\n";
print "/* make-target-delegates target.h > target-delegates.c */\n";
@lines = scan_target_h();
%tdefault_names = ();
%debug_names = ();
@delegators = ();
foreach $current_line (@lines) {
next unless $current_line =~ m/$METHOD/;
$name = $+{name};
$current_line = $+{args};
$return_type = trim ($+{return_type});
$current_args = $+{args};
$tdefault = $+{default_arg};
$style = $+{style};
@argtypes = parse_argtypes ($current_args);
# The first argument must be "this" to be delegatable.
if ($argtypes[0] =~ /\s*struct\s+target_ops\s*\*\s*/) {
write_delegator ($name, $return_type, @argtypes);
push @delegators, $name;
$tdefault_names{$name} = write_tdefault ($tdefault, $style,
$name, $return_type,
@argtypes);
$debug_names{$name} = write_debugmethod ($tdefault, $style,
$name, $return_type,
@argtypes);
}
}
# Now the delegation code.
print "static void\ninstall_delegators (struct target_ops *ops)\n{\n";
for $iter (@delegators) {
print " if (ops->" . $iter . " == NULL)\n";
print " ops->" . $iter . " = " . dname ($iter) . ";\n";
}
print "}\n\n";
# Now the default method code.
print "static void\ninstall_dummy_methods (struct target_ops *ops)\n{\n";
for $iter (@delegators) {
print " ops->" . $iter . " = " . $tdefault_names{$iter} . ";\n";
}
print "}\n\n";
# The debug method code.
print "static void\ninit_debug_target (struct target_ops *ops)\n{\n";
for $iter (@delegators) {
print " ops->" . $iter . " = " . $debug_names{$iter} . ";\n";
}
print "}\n";
|