clang/tools/scan-build/libexec/ccc-analyzer

   1 #!/usr/bin/env perl
   2 #
   3 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 # See https://llvm.org/LICENSE.txt for license information.
   5 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 #
   7 ##===----------------------------------------------------------------------===##
   8 #
   9 #  A script designed to interpose between the build system and gcc.  It invokes
  10 #  both gcc and the static analyzer.
  11 #
  12 ##===----------------------------------------------------------------------===##
  13
  14 use strict;
  15 use warnings;
  16 use FindBin;
  17 use Cwd qw/ getcwd abs_path /;
  18 use File::Temp qw/ tempfile /;
  19 use File::Path qw / mkpath /;
  20 use File::Basename;
  21 use Text::ParseWords;
  22
  23 ##===----------------------------------------------------------------------===##
  24 # List form 'system' with STDOUT and STDERR captured.
  25 ##===----------------------------------------------------------------------===##
  26
  27 sub silent_system {
  28   my $HtmlDir = shift;
  29   my $Command = shift;
  30
  31   # Save STDOUT and STDERR and redirect to a temporary file.
  32   open OLDOUT, ">&", \*STDOUT;
  33   open OLDERR, ">&", \*STDERR;
  34   my ($TmpFH, $TmpFile) = tempfile("temp_buf_XXXXXX",
  35                                    DIR => $HtmlDir,
  36                                    UNLINK => 1);
  37   open(STDOUT, ">$TmpFile");
  38   open(STDERR, ">&", \*STDOUT);
  39
  40   # Invoke 'system', STDOUT and STDERR are output to a temporary file.
  41   system $Command, @_;
  42
  43   # Restore STDOUT and STDERR.
  44   open STDOUT, ">&", \*OLDOUT;
  45   open STDERR, ">&", \*OLDERR;
  46
  47   return $TmpFH;
  48 }
  49
  50 ##===----------------------------------------------------------------------===##
  51 # Compiler command setup.
  52 ##===----------------------------------------------------------------------===##
  53
  54 # Search in the PATH if the compiler exists
  55 sub SearchInPath {
  56     my $file = shift;
  57     foreach my $dir (split (':', $ENV{PATH})) {
  58         if (-x "$dir/$file") {
  59             return 1;
  60         }
  61     }
  62     return 0;
  63 }
  64
  65 my $Compiler;
  66 my $Clang;
  67 my $DefaultCCompiler;
  68 my $DefaultCXXCompiler;
  69 my $IsCXX;
  70 my $AnalyzerTarget;
  71
  72 # If on OSX, use xcrun to determine the SDK root.
  73 my $UseXCRUN = 0;
  74
  75 if (`uname -s` =~ m/Darwin/) {
  76   $DefaultCCompiler = 'clang';
  77   $DefaultCXXCompiler = 'clang++';
  78   # Older versions of OSX do not have xcrun to
  79   # query the SDK location.
  80   if (-x "/usr/bin/xcrun") {
  81     $UseXCRUN = 1;
  82   }
  83 } elsif (`uname -s` =~ m/(FreeBSD|OpenBSD)/) {
  84   $DefaultCCompiler = 'cc';
  85   $DefaultCXXCompiler = 'c++';
  86 } else {
  87   $DefaultCCompiler = 'gcc';
  88   $DefaultCXXCompiler = 'g++';
  89 }
  90
  91 if ($FindBin::Script =~ /c\+\+-analyzer/) {
  92   $Compiler = $ENV{'CCC_CXX'};
  93   if (!defined $Compiler || (! -x $Compiler && ! SearchInPath($Compiler))) { $Compiler = $DefaultCXXCompiler; }
  94
  95   $Clang = $ENV{'CLANG_CXX'};
  96   if (!defined $Clang || ! -x $Clang) { $Clang = 'clang++'; }
  97
  98   $IsCXX = 1
  99 }
 100 else {
 101   $Compiler = $ENV{'CCC_CC'};
 102   if (!defined $Compiler || (! -x $Compiler && ! SearchInPath($Compiler))) { $Compiler = $DefaultCCompiler; }
 103
 104   $Clang = $ENV{'CLANG'};
 105   if (!defined $Clang || ! -x $Clang) { $Clang = 'clang'; }
 106
 107   $IsCXX = 0
 108 }
 109
 110 $AnalyzerTarget = $ENV{'CLANG_ANALYZER_TARGET'};
 111
 112 ##===----------------------------------------------------------------------===##
 113 # Cleanup.
 114 ##===----------------------------------------------------------------------===##
 115
 116 my $ReportFailures = $ENV{'CCC_REPORT_FAILURES'};
 117 if (!defined $ReportFailures) { $ReportFailures = 1; }
 118
 119 my $CleanupFile;
 120 my $ResultFile;
 121
 122 # Remove any stale files at exit.
 123 END {
 124   if (defined $ResultFile && -z $ResultFile) {
 125     unlink($ResultFile);
 126   }
 127   if (defined $CleanupFile) {
 128     unlink($CleanupFile);
 129   }
 130 }
 131
 132 ##----------------------------------------------------------------------------##
 133 #  Process Clang Crashes.
 134 ##----------------------------------------------------------------------------##
 135
 136 sub GetPPExt {
 137   my $Lang = shift;
 138   if ($Lang =~ /objective-c\+\+/) { return ".mii" };
 139   if ($Lang =~ /objective-c/) { return ".mi"; }
 140   if ($Lang =~ /c\+\+/) { return ".ii"; }
 141   return ".i";
 142 }
 143
 144 # Set this to 1 if we want to include 'parser rejects' files.
 145 my $IncludeParserRejects = 0;
 146 my $ParserRejects = "Parser Rejects";
 147 my $AttributeIgnored = "Attribute Ignored";
 148 my $OtherError = "Other Error";
 149
 150 sub ProcessClangFailure {
 151   my ($Clang, $Lang, $file, $Args, $HtmlDir, $ErrorType, $ofile) = @_;
 152   my $Dir = "$HtmlDir/failures";
 153   mkpath $Dir;
 154
 155   my $prefix = "clang_crash";
 156   if ($ErrorType eq $ParserRejects) {
 157     $prefix = "clang_parser_rejects";
 158   }
 159   elsif ($ErrorType eq $AttributeIgnored) {
 160     $prefix = "clang_attribute_ignored";
 161   }
 162   elsif ($ErrorType eq $OtherError) {
 163     $prefix = "clang_other_error";
 164   }
 165
 166   # Generate the preprocessed file with Clang.
 167   my ($PPH, $PPFile) = tempfile( $prefix . "_XXXXXX",
 168                                  SUFFIX => GetPPExt($Lang),
 169                                  DIR => $Dir);
 170   close ($PPH);
 171   system $Clang, @$Args, "-E", "-o", $PPFile;
 172
 173   # Create the info file.
 174   open (OUT, ">", "$PPFile.info.txt") or die "Cannot open $PPFile.info.txt\n";
 175   print OUT abs_path($file), "\n";
 176   print OUT "$ErrorType\n";
 177   print OUT "@$Args\n";
 178   close OUT;
 179   `uname -a >> $PPFile.info.txt 2>&1`;
 180   `"$Compiler" -v >> $PPFile.info.txt 2>&1`;
 181   rename($ofile, "$PPFile.stderr.txt");
 182   return (basename $PPFile);
 183 }
 184
 185 ##----------------------------------------------------------------------------##
 186 #  Running the analyzer.
 187 ##----------------------------------------------------------------------------##
 188
 189 sub GetCCArgs {
 190   my $HtmlDir = shift;
 191   my $mode = shift;
 192   my $Args = shift;
 193   my $line;
 194   my $OutputStream = silent_system($HtmlDir, $Clang, "-###", $mode, @$Args);
 195   while (<$OutputStream>) {
 196     next if (!/\s"?-cc1"?\s/);
 197     $line = $_;
 198   }
 199   die "could not find clang line\n" if (!defined $line);
 200   # Strip leading and trailing whitespace characters.
 201   $line =~ s/^\s+|\s+$//g;
 202   my @items = quotewords('\s+', 0, $line);
 203   my $cmd = shift @items;
 204   die "cannot find 'clang' in 'clang' command\n" if (!($cmd =~ /clang/ || basename($cmd) =~ /llvm/));
 205   # If this is the llvm-driver the internal command will look like "llvm clang ...".
 206   # Later this will be invoked like "clang clang ...", so skip over it.
 207   if (basename($cmd) =~ /llvm/) {
 208     die "Expected first arg to llvm driver to be 'clang'" if $items[0] ne "clang";
 209     shift @items;
 210   }
 211   return \@items;
 212 }
 213
 214 sub Analyze {
 215   my ($Clang, $OriginalArgs, $AnalyzeArgs, $Lang, $Output, $Verbose, $HtmlDir,
 216       $file) = @_;
 217
 218   my @Args = @$OriginalArgs;
 219   my $Cmd;
 220   my @CmdArgs;
 221   my @CmdArgsSansAnalyses;
 222
 223   if ($Lang =~ /header/) {
 224     exit 0 if (!defined ($Output));
 225     $Cmd = 'cp';
 226     push @CmdArgs, $file;
 227     # Remove the PCH extension.
 228     $Output =~ s/[.]gch$//;
 229     push @CmdArgs, $Output;
 230     @CmdArgsSansAnalyses = @CmdArgs;
 231   }
 232   else {
 233     $Cmd = $Clang;
 234
 235     # Create arguments for doing regular parsing.
 236     my $SyntaxArgs = GetCCArgs($HtmlDir, "-fsyntax-only", \@Args);
 237     @CmdArgsSansAnalyses = @$SyntaxArgs;
 238
 239     # Create arguments for doing static analysis.
 240     if (defined $ResultFile) {
 241       push @Args, '-o', $ResultFile;
 242     }
 243     elsif (defined $HtmlDir) {
 244       push @Args, '-o', $HtmlDir;
 245     }
 246     if ($Verbose) {
 247       push @Args, "-Xclang", "-analyzer-display-progress";
 248     }
 249
 250     foreach my $arg (@$AnalyzeArgs) {
 251       push @Args, "-Xclang", $arg;
 252     }
 253
 254     if (defined $AnalyzerTarget) {
 255       push @Args, "-target", $AnalyzerTarget;
 256     }
 257
 258     my $AnalysisArgs = GetCCArgs($HtmlDir, "--analyze", \@Args);
 259     @CmdArgs = @$AnalysisArgs;
 260   }
 261
 262   my @PrintArgs;
 263   my $dir;
 264
 265   if ($Verbose) {
 266     $dir = getcwd();
 267     print STDERR "\n[LOCATION]: $dir\n";
 268     push @PrintArgs,"'$Cmd'";
 269     foreach my $arg (@CmdArgs) {
 270         push @PrintArgs,"\'$arg\'";
 271     }
 272   }
 273   if ($Verbose == 1) {
 274     # We MUST print to stderr.  Some clients use the stdout output of
 275     # gcc for various purposes.
 276     print STDERR join(' ', @PrintArgs);
 277     print STDERR "\n";
 278   }
 279   elsif ($Verbose == 2) {
 280     print STDERR "#SHELL (cd '$dir' && @PrintArgs)\n";
 281   }
 282
 283   # Save STDOUT and STDERR of clang to a temporary file and reroute
 284   # all clang output to ccc-analyzer's STDERR.
 285   # We save the output file in the 'crashes' directory if clang encounters
 286   # any problems with the file.
 287   my ($ofh, $ofile) = tempfile("clang_output_XXXXXX", DIR => $HtmlDir);
 288
 289   my $OutputStream = silent_system($HtmlDir, $Cmd, @CmdArgs);
 290   while ( <$OutputStream> ) {
 291     print $ofh $_;
 292     print STDERR $_;
 293   }
 294   my $Result = $?;
 295   close $ofh;
 296
 297   # Did the command die because of a signal?
 298   if ($ReportFailures) {
 299     if ($Result & 127 and $Cmd eq $Clang and defined $HtmlDir) {
 300       ProcessClangFailure($Clang, $Lang, $file, \@CmdArgsSansAnalyses,
 301                           $HtmlDir, "Crash", $ofile);
 302     }
 303     elsif ($Result) {
 304       if ($IncludeParserRejects && !($file =~/conftest/)) {
 305         ProcessClangFailure($Clang, $Lang, $file, \@CmdArgsSansAnalyses,
 306                             $HtmlDir, $ParserRejects, $ofile);
 307       } else {
 308         ProcessClangFailure($Clang, $Lang, $file, \@CmdArgsSansAnalyses,
 309                             $HtmlDir, $OtherError, $ofile);
 310       }
 311     }
 312     else {
 313       # Check if there were any unhandled attributes.
 314       if (open(CHILD, $ofile)) {
 315         my %attributes_not_handled;
 316
 317         # Don't flag warnings about the following attributes that we
 318         # know are currently not supported by Clang.
 319         $attributes_not_handled{"cdecl"} = 1;
 320
 321         my $ppfile;
 322         while (<CHILD>) {
 323           next if (! /warning: '([^\']+)' attribute ignored/);
 324
 325           # Have we already spotted this unhandled attribute?
 326           next if (defined $attributes_not_handled{$1});
 327           $attributes_not_handled{$1} = 1;
 328
 329           # Get the name of the attribute file.
 330           my $dir = "$HtmlDir/failures";
 331           my $afile = "$dir/attribute_ignored_$1.txt";
 332
 333           # Only create another preprocessed file if the attribute file
 334           # doesn't exist yet.
 335           next if (-e $afile);
 336
 337           # Add this file to the list of files that contained this attribute.
 338           # Generate a preprocessed file if we haven't already.
 339           if (!(defined $ppfile)) {
 340             $ppfile = ProcessClangFailure($Clang, $Lang, $file,
 341                                           \@CmdArgsSansAnalyses,
 342                                           $HtmlDir, $AttributeIgnored, $ofile);
 343           }
 344
 345           mkpath $dir;
 346           open(AFILE, ">$afile");
 347           print AFILE "$ppfile\n";
 348           close(AFILE);
 349         }
 350         close CHILD;
 351       }
 352     }
 353   }
 354
 355   unlink($ofile);
 356 }
 357
 358 ##----------------------------------------------------------------------------##
 359 #  Lookup tables.
 360 ##----------------------------------------------------------------------------##
 361
 362 my %CompileOptionMap = (
 363   '-nostdinc' => 0,
 364   '-nostdlibinc' => 0,
 365   '-include' => 1,
 366   '-idirafter' => 1,
 367   '-imacros' => 1,
 368   '-iprefix' => 1,
 369   '-iquote' => 1,
 370   '-iwithprefix' => 1,
 371   '-iwithprefixbefore' => 1
 372 );
 373
 374 my %LinkerOptionMap = (
 375   '-framework' => 1,
 376   '-fobjc-link-runtime' => 0
 377 );
 378
 379 my %CompilerLinkerOptionMap = (
 380   '-Wwrite-strings' => 0,
 381   '-ftrapv-handler' => 1, # specifically call out separated -f flag
 382   '-mios-simulator-version-min' => 0, # This really has 1 argument, but always has '='
 383   '-isysroot' => 1,
 384   '-arch' => 1,
 385   '-m32' => 0,
 386   '-m64' => 0,
 387   '-stdlib' => 0, # This is really a 1 argument, but always has '='
 388   '--sysroot' => 1,
 389   '-target' => 1,
 390   '-v' => 0,
 391   '-mmacosx-version-min' => 0, # This is really a 1 argument, but always has '='
 392   '-mmacos-version-min' => 0, # This is really a 1 argument, but always has '='
 393   '-miphoneos-version-min' => 0, # This is really a 1 argument, but always has '='
 394   '--target' => 0
 395 );
 396
 397 my %IgnoredOptionMap = (
 398   '-MT' => 1,  # Ignore these preprocessor options.
 399   '-MF' => 1,
 400
 401   '-fsyntax-only' => 0,
 402   '-save-temps' => 0,
 403   '-install_name' => 1,
 404   '-exported_symbols_list' => 1,
 405   '-current_version' => 1,
 406   '-compatibility_version' => 1,
 407   '-init' => 1,
 408   '-e' => 1,
 409   '-seg1addr' => 1,
 410   '-bundle_loader' => 1,
 411   '-multiply_defined' => 1,
 412   '-sectorder' => 3,
 413   '--param' => 1,
 414   '-u' => 1,
 415   '--serialize-diagnostics' => 1
 416 );
 417
 418 my %LangMap = (
 419   'c'   => $IsCXX ? 'c++' : 'c',
 420   'cp'  => 'c++',
 421   'cpp' => 'c++',
 422   'cxx' => 'c++',
 423   'txx' => 'c++',
 424   'cc'  => 'c++',
 425   'C'   => 'c++',
 426   'ii'  => 'c++-cpp-output',
 427   'i'   => $IsCXX ? 'c++-cpp-output' : 'cpp-output',
 428   'm'   => 'objective-c',
 429   'mi'  => 'objective-c-cpp-output',
 430   'mm'  => 'objective-c++',
 431   'mii' => 'objective-c++-cpp-output',
 432 );
 433
 434 my %UniqueOptions = (
 435   '-isysroot' => 0
 436 );
 437
 438 ##----------------------------------------------------------------------------##
 439 # Languages accepted.
 440 ##----------------------------------------------------------------------------##
 441
 442 my %LangsAccepted = (
 443   "objective-c" => 1,
 444   "c" => 1,
 445   "c++" => 1,
 446   "objective-c++" => 1,
 447   "cpp-output" => 1,
 448   "objective-c-cpp-output" => 1,
 449   "c++-cpp-output" => 1
 450 );
 451
 452 ##----------------------------------------------------------------------------##
 453 #  Main Logic.
 454 ##----------------------------------------------------------------------------##
 455
 456 my $Action = 'link';
 457 my @CompileOpts;
 458 my @LinkOpts;
 459 my @Files;
 460 my $Lang;
 461 my $Output;
 462 my %Uniqued;
 463
 464 # Forward arguments to gcc.
 465 my $Status = system($Compiler,@ARGV);
 466 if (defined $ENV{'CCC_ANALYZER_LOG'}) {
 467   print STDERR "$Compiler @ARGV\n";
 468 }
 469 if ($Status) { exit($Status >> 8); }
 470
 471 # Get the analysis options.
 472 my $Analyses = $ENV{'CCC_ANALYZER_ANALYSIS'};
 473
 474 # Get the plugins to load.
 475 my $Plugins = $ENV{'CCC_ANALYZER_PLUGINS'};
 476
 477 # Get the constraints engine.
 478 my $ConstraintsModel = $ENV{'CCC_ANALYZER_CONSTRAINTS_MODEL'};
 479
 480 #Get the internal stats setting.
 481 my $InternalStats = $ENV{'CCC_ANALYZER_INTERNAL_STATS'};
 482
 483 # Get the output format.
 484 my $OutputFormat = $ENV{'CCC_ANALYZER_OUTPUT_FORMAT'};
 485 if (!defined $OutputFormat) { $OutputFormat = "html"; }
 486
 487 # Get the config options.
 488 my $ConfigOptions = $ENV{'CCC_ANALYZER_CONFIG'};
 489
 490 # Determine the level of verbosity.
 491 my $Verbose = 0;
 492 if (defined $ENV{'CCC_ANALYZER_VERBOSE'}) { $Verbose = 1; }
 493 if (defined $ENV{'CCC_ANALYZER_LOG'}) { $Verbose = 2; }
 494
 495 # Get the HTML output directory.
 496 my $HtmlDir = $ENV{'CCC_ANALYZER_HTML'};
 497
 498 # Get force-analyze-debug-code option.
 499 my $ForceAnalyzeDebugCode = $ENV{'CCC_ANALYZER_FORCE_ANALYZE_DEBUG_CODE'};
 500
 501 my %DisabledArchs = ('ppc' => 1, 'ppc64' => 1);
 502 my %ArchsSeen;
 503 my $HadArch = 0;
 504 my $HasSDK = 0;
 505
 506 # Process the arguments.
 507 foreach (my $i = 0; $i < scalar(@ARGV); ++$i) {
 508   my $Arg = $ARGV[$i];
 509   my @ArgParts = split /=/,$Arg,2;
 510   my $ArgKey = $ArgParts[0];
 511
 512   # Be friendly to "" in the argument list.
 513   if (!defined($ArgKey)) {
 514     next;
 515   }
 516
 517   # Modes ccc-analyzer supports
 518   if ($Arg =~ /^-(E|MM?)$/) { $Action = 'preprocess'; }
 519   elsif ($Arg eq '-c') { $Action = 'compile'; }
 520   elsif ($Arg =~ /^-print-prog-name/) { exit 0; }
 521
 522   # Specially handle duplicate cases of -arch
 523   if ($Arg eq "-arch") {
 524     my $arch = $ARGV[$i+1];
 525     # We don't want to process 'ppc' because of Clang's lack of support
 526     # for Altivec (also some #defines won't likely be defined correctly, etc.)
 527     if (!(defined $DisabledArchs{$arch})) { $ArchsSeen{$arch} = 1; }
 528     $HadArch = 1;
 529     ++$i;
 530     next;
 531   }
 532
 533   # On OSX/iOS, record if an SDK path was specified.  This
 534   # is innocuous for other platforms, so the check just happens.
 535   if ($Arg =~ /^-isysroot/) {
 536     $HasSDK = 1;
 537   }
 538
 539   # Options with possible arguments that should pass through to compiler.
 540   if (defined $CompileOptionMap{$ArgKey}) {
 541     my $Cnt = $CompileOptionMap{$ArgKey};
 542     push @CompileOpts,$Arg;
 543     while ($Cnt > 0) { ++$i; --$Cnt; push @CompileOpts, $ARGV[$i]; }
 544     next;
 545   }
 546   # Handle the case where there isn't a space after -iquote
 547   if ($Arg =~ /^-iquote.*/) {
 548     push @CompileOpts,$Arg;
 549     next;
 550   }
 551
 552   # Options with possible arguments that should pass through to linker.
 553   if (defined $LinkerOptionMap{$ArgKey}) {
 554     my $Cnt = $LinkerOptionMap{$ArgKey};
 555     push @LinkOpts,$Arg;
 556     while ($Cnt > 0) { ++$i; --$Cnt; push @LinkOpts, $ARGV[$i]; }
 557     next;
 558   }
 559
 560   # Options with possible arguments that should pass through to both compiler
 561   # and the linker.
 562   if (defined $CompilerLinkerOptionMap{$ArgKey}) {
 563     my $Cnt = $CompilerLinkerOptionMap{$ArgKey};
 564
 565     # Check if this is an option that should have a unique value, and if so
 566     # determine if the value was checked before.
 567     if ($UniqueOptions{$Arg}) {
 568       if (defined $Uniqued{$Arg}) {
 569         $i += $Cnt;
 570         next;
 571       }
 572       $Uniqued{$Arg} = 1;
 573     }
 574
 575     push @CompileOpts,$Arg;
 576     push @LinkOpts,$Arg;
 577
 578     if (scalar @ArgParts == 1) {
 579       while ($Cnt > 0) {
 580         ++$i; --$Cnt;
 581         push @CompileOpts, $ARGV[$i];
 582         push @LinkOpts, $ARGV[$i];
 583       }
 584     }
 585     next;
 586   }
 587
 588   # Ignored options.
 589   if (defined $IgnoredOptionMap{$ArgKey}) {
 590     my $Cnt = $IgnoredOptionMap{$ArgKey};
 591     while ($Cnt > 0) {
 592       ++$i; --$Cnt;
 593     }
 594     next;
 595   }
 596
 597   # Compile mode flags.
 598   if ($Arg =~ /^-(?:[DIU]|isystem)(.*)$/) {
 599     my $Tmp = $Arg;
 600     if ($1 eq '') {
 601       # FIXME: Check if we are going off the end.
 602       ++$i;
 603       $Tmp = $Arg . $ARGV[$i];
 604     }
 605     push @CompileOpts,$Tmp;
 606     next;
 607   }
 608
 609   if ($Arg =~ /^-m.*/) {
 610     push @CompileOpts,$Arg;
 611     next;
 612   }
 613
 614   # Language.
 615   if ($Arg eq '-x') {
 616     $Lang = $ARGV[$i+1];
 617     ++$i; next;
 618   }
 619
 620   # Output file.
 621   if ($Arg eq '-o') {
 622     ++$i;
 623     $Output = $ARGV[$i];
 624     next;
 625   }
 626
 627   # Get the link mode.
 628   if ($Arg =~ /^-[l,L,O]/) {
 629     if ($Arg eq '-O') { push @LinkOpts,'-O1'; }
 630     elsif ($Arg eq '-Os') { push @LinkOpts,'-O2'; }
 631     else { push @LinkOpts,$Arg; }
 632
 633     # Must pass this along for the __OPTIMIZE__ macro
 634     if ($Arg =~ /^-O/) { push @CompileOpts,$Arg; }
 635     next;
 636   }
 637
 638   if ($Arg =~ /^-std=/) {
 639     push @CompileOpts,$Arg;
 640     next;
 641   }
 642
 643   # Get the compiler/link mode.
 644   if ($Arg =~ /^-F(.+)$/) {
 645     my $Tmp = $Arg;
 646     if ($1 eq '') {
 647       # FIXME: Check if we are going off the end.
 648       ++$i;
 649       $Tmp = $Arg . $ARGV[$i];
 650     }
 651     push @CompileOpts,$Tmp;
 652     push @LinkOpts,$Tmp;
 653     next;
 654   }
 655
 656   # Input files.
 657   if ($Arg eq '-filelist') {
 658     # FIXME: Make sure we aren't walking off the end.
 659     open(IN, $ARGV[$i+1]);
 660     while (<IN>) { s/\015?\012//; push @Files,$_; }
 661     close(IN);
 662     ++$i;
 663     next;
 664   }
 665
 666   if ($Arg =~ /^-f/) {
 667     push @CompileOpts,$Arg;
 668     push @LinkOpts,$Arg;
 669     next;
 670   }
 671
 672   # Handle -Wno-.  We don't care about extra warnings, but
 673   # we should suppress ones that we don't want to see.
 674   if ($Arg =~ /^-Wno-/) {
 675     push @CompileOpts, $Arg;
 676     next;
 677   }
 678
 679   # Handle -Xclang some-arg. Add both arguments to the compiler options.
 680   if ($Arg =~ /^-Xclang$/) {
 681     # FIXME: Check if we are going off the end.
 682     ++$i;
 683     push @CompileOpts, $Arg;
 684     push @CompileOpts, $ARGV[$i];
 685     next;
 686   }
 687
 688   if (!($Arg =~ /^-/)) {
 689     push @Files, $Arg;
 690     next;
 691   }
 692 }
 693
 694 # Forcedly enable debugging if requested by user.
 695 if ($ForceAnalyzeDebugCode) {
 696   push @CompileOpts, '-UNDEBUG';
 697 }
 698
 699 # If we are on OSX and have an installation where the
 700 # default SDK is inferred by xcrun use xcrun to infer
 701 # the SDK.
 702 if (not $HasSDK and $UseXCRUN) {
 703   my $sdk = `/usr/bin/xcrun --show-sdk-path -sdk macosx`;
 704   chomp $sdk;
 705   push @CompileOpts, "-isysroot", $sdk;
 706 }
 707
 708 if ($Action eq 'compile' or $Action eq 'link') {
 709   my @Archs = keys %ArchsSeen;
 710   # Skip the file if we don't support the architectures specified.
 711   exit 0 if ($HadArch && scalar(@Archs) == 0);
 712
 713   foreach my $file (@Files) {
 714     # Determine the language for the file.
 715     my $FileLang = $Lang;
 716
 717     if (!defined($FileLang)) {
 718       # Infer the language from the extension.
 719       if ($file =~ /[.]([^.]+)$/) {
 720         $FileLang = $LangMap{$1};
 721       }
 722     }
 723
 724     # FileLang still not defined?  Skip the file.
 725     next if (!defined $FileLang);
 726
 727     # Language not accepted?
 728     next if (!defined $LangsAccepted{$FileLang});
 729
 730     my @CmdArgs;
 731     my @AnalyzeArgs;
 732
 733     if ($FileLang ne 'unknown') {
 734       push @CmdArgs, '-x', $FileLang;
 735     }
 736
 737     if (defined $ConstraintsModel) {
 738       push @AnalyzeArgs, "-analyzer-constraints=$ConstraintsModel";
 739     }
 740
 741     if (defined $InternalStats) {
 742       push @AnalyzeArgs, "-analyzer-stats";
 743     }
 744
 745     if (defined $Analyses) {
 746       push @AnalyzeArgs, split '\s+', $Analyses;
 747     }
 748
 749     if (defined $Plugins) {
 750       push @AnalyzeArgs, split '\s+', $Plugins;
 751     }
 752
 753     if (defined $OutputFormat) {
 754       push @AnalyzeArgs, "-analyzer-output=" . $OutputFormat;
 755       if ($OutputFormat =~ /plist/ || $OutputFormat =~ /sarif/) {
 756         # Change "Output" to be a file.
 757         my $Suffix = $OutputFormat =~ /plist/ ? ".plist" : ".sarif";
 758         my ($h, $f) = tempfile("report-XXXXXX", SUFFIX => $Suffix,
 759                                DIR => $HtmlDir);
 760         $ResultFile = $f;
 761         # If the HtmlDir is not set, we should clean up the plist files.
 762         if (!defined $HtmlDir || $HtmlDir eq "") {
 763           $CleanupFile = $f;
 764         }
 765       }
 766     }
 767     if (defined $ConfigOptions) {
 768       push @AnalyzeArgs, split '\s+', $ConfigOptions;
 769     }
 770
 771     push @CmdArgs, @CompileOpts;
 772     push @CmdArgs, $file;
 773
 774     if (scalar @Archs) {
 775       foreach my $arch (@Archs) {
 776         my @NewArgs;
 777         push @NewArgs, '-arch', $arch;
 778         push @NewArgs, @CmdArgs;
 779         Analyze($Clang, \@NewArgs, \@AnalyzeArgs, $FileLang, $Output,
 780                 $Verbose, $HtmlDir, $file);
 781       }
 782     }
 783     else {
 784       Analyze($Clang, \@CmdArgs, \@AnalyzeArgs, $FileLang, $Output,
 785               $Verbose, $HtmlDir, $file);
 786     }
 787   }
 788 }