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