| 1 | #!/usr/bin/perl |
| 2 | |
| 3 | # Copyright (C) 2013-2017 Free Software Foundation, Inc. |
| 4 | # |
| 5 | # This file is part of GDB. |
| 6 | # |
| 7 | # This program is free software; you can redistribute it and/or modify |
| 8 | # it under the terms of the GNU General Public License as published by |
| 9 | # the Free Software Foundation; either version 3 of the License, or |
| 10 | # (at your option) any later version. |
| 11 | # |
| 12 | # This program is distributed in the hope that it will be useful, |
| 13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | # GNU General Public License for more details. |
| 16 | # |
| 17 | # You should have received a copy of the GNU General Public License |
| 18 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 19 | |
| 20 | |
| 21 | # Usage: |
| 22 | # make-target-delegates target.h > target-delegates.c |
| 23 | |
| 24 | # The line we search for in target.h that marks where we should start |
| 25 | # looking for methods. |
| 26 | $TRIGGER = qr,^struct target_ops$,; |
| 27 | # The end of the methods part. |
| 28 | $ENDER = qr,^\s*};$,; |
| 29 | |
| 30 | # Match a C symbol. |
| 31 | $SYMBOL = qr,[a-zA-Z_][a-zA-Z0-9_]*,; |
| 32 | # Match the name part of a method in struct target_ops. |
| 33 | $NAME_PART = qr,\(\*(?<name>${SYMBOL}+)\)\s,; |
| 34 | # Match the arguments to a method. |
| 35 | $ARGS_PART = qr,(?<args>\(.*\)),; |
| 36 | # We strip the indentation so here we only need the caret. |
| 37 | $INTRO_PART = qr,^,; |
| 38 | |
| 39 | # Match the return type when it is "ordinary". |
| 40 | $SIMPLE_RETURN_PART = qr,[^\(]+,; |
| 41 | # Match the return type when it is a VEC. |
| 42 | $VEC_RETURN_PART = qr,VEC\s*\([^\)]+\)[^\(]*,; |
| 43 | |
| 44 | # Match the TARGET_DEFAULT_* attribute for a method. |
| 45 | $TARGET_DEFAULT_PART = qr,TARGET_DEFAULT_(?<style>[A-Z_]+)\s*\((?<default_arg>.*)\),; |
| 46 | |
| 47 | # Match the arguments and trailing attribute of a method definition. |
| 48 | # Note we don't match the trailing ";". |
| 49 | $METHOD_TRAILER = qr,\s*${TARGET_DEFAULT_PART}$,; |
| 50 | |
| 51 | # Match an entire method definition. |
| 52 | $METHOD = ($INTRO_PART . "(?<return_type>" . $SIMPLE_RETURN_PART |
| 53 | . "|" . $VEC_RETURN_PART . ")" |
| 54 | . $NAME_PART . $ARGS_PART |
| 55 | . $METHOD_TRAILER); |
| 56 | |
| 57 | # Match TARGET_DEBUG_PRINTER in an argument type. |
| 58 | # This must match the whole "sub-expression" including the parens. |
| 59 | # Reference $1 must refer to the function argument. |
| 60 | $TARGET_DEBUG_PRINTER = qr,\s*TARGET_DEBUG_PRINTER\s*\(([^)]*)\)\s*,; |
| 61 | |
| 62 | sub trim($) { |
| 63 | my ($result) = @_; |
| 64 | |
| 65 | $result =~ s,^\s+,,; |
| 66 | $result =~ s,\s+$,,; |
| 67 | |
| 68 | return $result; |
| 69 | } |
| 70 | |
| 71 | # Read from the input files until we find the trigger line. |
| 72 | # Die if not found. |
| 73 | sub find_trigger() { |
| 74 | while (<>) { |
| 75 | chomp; |
| 76 | return if m/$TRIGGER/; |
| 77 | } |
| 78 | |
| 79 | die "could not find trigger line\n"; |
| 80 | } |
| 81 | |
| 82 | # Scan target.h and return a list of possible target_ops method entries. |
| 83 | sub scan_target_h() { |
| 84 | my $all_the_text = ''; |
| 85 | |
| 86 | find_trigger(); |
| 87 | while (<>) { |
| 88 | chomp; |
| 89 | # Skip the open brace. |
| 90 | next if /{/; |
| 91 | last if m/$ENDER/; |
| 92 | |
| 93 | # Just in case somebody ever uses C99. |
| 94 | $_ =~ s,//.*$,,; |
| 95 | $_ = trim ($_); |
| 96 | |
| 97 | $all_the_text .= $_; |
| 98 | } |
| 99 | |
| 100 | # Now strip out the C comments. |
| 101 | $all_the_text =~ s,/\*(.*?)\*/,,g; |
| 102 | |
| 103 | return split (/;/, $all_the_text); |
| 104 | } |
| 105 | |
| 106 | # Parse arguments into a list. |
| 107 | sub parse_argtypes($) { |
| 108 | my ($typestr) = @_; |
| 109 | |
| 110 | $typestr =~ s/^\((.*)\)$/\1/; |
| 111 | |
| 112 | my (@typelist) = split (/,\s*/, $typestr); |
| 113 | my (@result, $iter, $onetype); |
| 114 | |
| 115 | foreach $iter (@typelist) { |
| 116 | if ($iter =~ m/^(enum\s+${SYMBOL}\s*)(${SYMBOL})?$/) { |
| 117 | $onetype = $1; |
| 118 | } elsif ($iter =~ m/^(.*(enum\s+)?${SYMBOL}.*(\s|\*))${SYMBOL}+$/) { |
| 119 | $onetype = $1; |
| 120 | } elsif ($iter eq 'void') { |
| 121 | next; |
| 122 | } else { |
| 123 | $onetype = $iter; |
| 124 | } |
| 125 | push @result, trim ($onetype); |
| 126 | } |
| 127 | |
| 128 | return @result; |
| 129 | } |
| 130 | |
| 131 | sub dname($) { |
| 132 | my ($name) = @_; |
| 133 | $name =~ s/to_/delegate_/; |
| 134 | return $name; |
| 135 | } |
| 136 | |
| 137 | # Write function header given name, return type, and argtypes. |
| 138 | # Returns a list of actual argument names. |
| 139 | sub write_function_header($$@) { |
| 140 | my ($name, $return_type, @argtypes) = @_; |
| 141 | |
| 142 | print "static " . $return_type . "\n"; |
| 143 | print $name . ' ('; |
| 144 | |
| 145 | my $iter; |
| 146 | my @argdecls; |
| 147 | my @actuals; |
| 148 | my $i = 0; |
| 149 | foreach $iter (@argtypes) { |
| 150 | my $val = $iter; |
| 151 | |
| 152 | $val =~ s/$TARGET_DEBUG_PRINTER//; |
| 153 | |
| 154 | if ($iter !~ m,\*$,) { |
| 155 | $val .= ' '; |
| 156 | } |
| 157 | |
| 158 | my $vname; |
| 159 | if ($i == 0) { |
| 160 | # Just a random nicety. |
| 161 | $vname = 'self'; |
| 162 | } else { |
| 163 | $vname .= "arg$i"; |
| 164 | } |
| 165 | $val .= $vname; |
| 166 | |
| 167 | push @argdecls, $val; |
| 168 | push @actuals, $vname; |
| 169 | ++$i; |
| 170 | } |
| 171 | |
| 172 | print join (', ', @argdecls) . ")\n"; |
| 173 | print "{\n"; |
| 174 | |
| 175 | return @actuals; |
| 176 | } |
| 177 | |
| 178 | # Write out a delegation function. |
| 179 | sub write_delegator($$@) { |
| 180 | my ($name, $return_type, @argtypes) = @_; |
| 181 | |
| 182 | my (@names) = write_function_header (dname ($name), $return_type, |
| 183 | @argtypes); |
| 184 | |
| 185 | print " $names[0] = $names[0]->beneath;\n"; |
| 186 | print " "; |
| 187 | if ($return_type ne 'void') { |
| 188 | print "return "; |
| 189 | } |
| 190 | print "$names[0]->" . $name . " ("; |
| 191 | print join (', ', @names); |
| 192 | print ");\n"; |
| 193 | print "}\n\n"; |
| 194 | } |
| 195 | |
| 196 | sub tdname ($) { |
| 197 | my ($name) = @_; |
| 198 | $name =~ s/to_/tdefault_/; |
| 199 | return $name; |
| 200 | } |
| 201 | |
| 202 | # Write out a default function. |
| 203 | sub write_tdefault($$$$@) { |
| 204 | my ($content, $style, $name, $return_type, @argtypes) = @_; |
| 205 | |
| 206 | if ($style eq 'FUNC') { |
| 207 | return $content; |
| 208 | } |
| 209 | |
| 210 | write_function_header (tdname ($name), $return_type, @argtypes); |
| 211 | |
| 212 | if ($style eq 'RETURN') { |
| 213 | print " return $content;\n"; |
| 214 | } elsif ($style eq 'NORETURN') { |
| 215 | print " $content;\n"; |
| 216 | } elsif ($style eq 'IGNORE') { |
| 217 | # Nothing. |
| 218 | } else { |
| 219 | die "unrecognized style: $style\n"; |
| 220 | } |
| 221 | |
| 222 | print "}\n\n"; |
| 223 | |
| 224 | return tdname ($name); |
| 225 | } |
| 226 | |
| 227 | sub munge_type($) { |
| 228 | my ($typename) = @_; |
| 229 | my ($result); |
| 230 | |
| 231 | if ($typename =~ m/$TARGET_DEBUG_PRINTER/) { |
| 232 | $result = $1; |
| 233 | } else { |
| 234 | ($result = $typename) =~ s/\s+$//; |
| 235 | $result =~ s/[ ()<>:]/_/g; |
| 236 | $result =~ s/[*]/p/g; |
| 237 | |
| 238 | # Identifers with double underscores are reserved to the C++ |
| 239 | # implementation. |
| 240 | $result =~ s/_+/_/g; |
| 241 | |
| 242 | # Avoid ending the function name with underscore, for |
| 243 | # cosmetics. Trailing underscores appear after munging types |
| 244 | # with template parameters, like e.g. "foo<int>". |
| 245 | $result =~ s/_$//g; |
| 246 | |
| 247 | $result = 'target_debug_print_' . $result; |
| 248 | } |
| 249 | |
| 250 | return $result; |
| 251 | } |
| 252 | |
| 253 | # Write out a debug method. |
| 254 | sub write_debugmethod($$$$@) { |
| 255 | my ($content, $style, $name, $return_type, @argtypes) = @_; |
| 256 | |
| 257 | my ($debugname) = $name; |
| 258 | $debugname =~ s/to_/debug_/; |
| 259 | my ($targetname) = $name; |
| 260 | $targetname =~ s/to_/target_/; |
| 261 | |
| 262 | my (@names) = write_function_header ($debugname, $return_type, @argtypes); |
| 263 | |
| 264 | if ($return_type ne 'void') { |
| 265 | print " $return_type result;\n"; |
| 266 | } |
| 267 | |
| 268 | print " fprintf_unfiltered (gdb_stdlog, \"-> %s->$name (...)\\n\", debug_target.to_shortname);\n"; |
| 269 | |
| 270 | # Delegate to the beneath target. |
| 271 | print " "; |
| 272 | if ($return_type ne 'void') { |
| 273 | print "result = "; |
| 274 | } |
| 275 | print "debug_target." . $name . " ("; |
| 276 | my @names2 = @names; |
| 277 | @names2[0] = "&debug_target"; |
| 278 | print join (', ', @names2); |
| 279 | print ");\n"; |
| 280 | |
| 281 | # Now print the arguments. |
| 282 | print " fprintf_unfiltered (gdb_stdlog, \"<- %s->$name (\", debug_target.to_shortname);\n"; |
| 283 | for my $i (0 .. $#argtypes) { |
| 284 | print " fputs_unfiltered (\", \", gdb_stdlog);\n" if $i > 0; |
| 285 | my $printer = munge_type ($argtypes[$i]); |
| 286 | print " $printer ($names2[$i]);\n"; |
| 287 | } |
| 288 | if ($return_type ne 'void') { |
| 289 | print " fputs_unfiltered (\") = \", gdb_stdlog);\n"; |
| 290 | my $printer = munge_type ($return_type); |
| 291 | print " $printer (result);\n"; |
| 292 | print " fputs_unfiltered (\"\\n\", gdb_stdlog);\n"; |
| 293 | } else { |
| 294 | print " fputs_unfiltered (\")\\n\", gdb_stdlog);\n"; |
| 295 | } |
| 296 | |
| 297 | if ($return_type ne 'void') { |
| 298 | print " return result;\n"; |
| 299 | } |
| 300 | |
| 301 | print "}\n\n"; |
| 302 | |
| 303 | return $debugname; |
| 304 | } |
| 305 | |
| 306 | print "/* THIS FILE IS GENERATED -*- buffer-read-only: t -*- */\n"; |
| 307 | print "/* vi:set ro: */\n\n"; |
| 308 | print "/* To regenerate this file, run:*/\n"; |
| 309 | print "/* make-target-delegates target.h > target-delegates.c */\n"; |
| 310 | |
| 311 | @lines = scan_target_h(); |
| 312 | |
| 313 | |
| 314 | %tdefault_names = (); |
| 315 | %debug_names = (); |
| 316 | @delegators = (); |
| 317 | foreach $current_line (@lines) { |
| 318 | next unless $current_line =~ m/$METHOD/; |
| 319 | |
| 320 | $name = $+{name}; |
| 321 | $current_line = $+{args}; |
| 322 | $return_type = trim ($+{return_type}); |
| 323 | $current_args = $+{args}; |
| 324 | $tdefault = $+{default_arg}; |
| 325 | $style = $+{style}; |
| 326 | |
| 327 | @argtypes = parse_argtypes ($current_args); |
| 328 | |
| 329 | # The first argument must be "this" to be delegatable. |
| 330 | if ($argtypes[0] =~ /\s*struct\s+target_ops\s*\*\s*/) { |
| 331 | write_delegator ($name, $return_type, @argtypes); |
| 332 | |
| 333 | push @delegators, $name; |
| 334 | |
| 335 | $tdefault_names{$name} = write_tdefault ($tdefault, $style, |
| 336 | $name, $return_type, |
| 337 | @argtypes); |
| 338 | |
| 339 | $debug_names{$name} = write_debugmethod ($tdefault, $style, |
| 340 | $name, $return_type, |
| 341 | @argtypes); |
| 342 | } |
| 343 | } |
| 344 | |
| 345 | # Now the delegation code. |
| 346 | print "static void\ninstall_delegators (struct target_ops *ops)\n{\n"; |
| 347 | |
| 348 | for $iter (@delegators) { |
| 349 | print " if (ops->" . $iter . " == NULL)\n"; |
| 350 | print " ops->" . $iter . " = " . dname ($iter) . ";\n"; |
| 351 | } |
| 352 | print "}\n\n"; |
| 353 | |
| 354 | # Now the default method code. |
| 355 | print "static void\ninstall_dummy_methods (struct target_ops *ops)\n{\n"; |
| 356 | |
| 357 | for $iter (@delegators) { |
| 358 | print " ops->" . $iter . " = " . $tdefault_names{$iter} . ";\n"; |
| 359 | } |
| 360 | print "}\n\n"; |
| 361 | |
| 362 | # The debug method code. |
| 363 | print "static void\ninit_debug_target (struct target_ops *ops)\n{\n"; |
| 364 | for $iter (@delegators) { |
| 365 | print " ops->" . $iter . " = " . $debug_names{$iter} . ";\n"; |
| 366 | } |
| 367 | print "}\n"; |