250 lines
6.3 KiB
Perl
Executable File
250 lines
6.3 KiB
Perl
Executable File
#!/usr/bin/perl
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# Wrapper around LLVM tools to generate a native .o from llvm-gcc using an
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# LLVM back-end (CBE by default).
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# set up defaults.
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$Verbose = 0;
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$SaveTemps = 1;
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$PreprocessOnly = 0;
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$CompileDontLink = 0;
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$Backend = 'cbe';
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chomp ($ProgramName = `basename $0`);
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sub boldprint {
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print "[1m", @_, "[0m";
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}
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# process command-line options.
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# most of these are passed on to llvm-gcc.
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$GCCOptions = "";
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for ($i = 0; $i <= $#ARGV; ++$i) {
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if ($ARGV[$i] =~ /-mllvm-backend=([a-z0-9]*)/) {
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$Backend = $1;
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if ($ProgramName =~ /llvm-native-gcc/) {
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splice (@ARGV, $i, 1);
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--$i;
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}
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} elsif ($ARGV[$i] eq "-E") {
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$PreprocessOnly = 1;
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} elsif ($ARGV[$i] eq "-c") {
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$GCCOptions .= " " . $ARGV[$i];
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$CompileDontLink = 1;
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} elsif ($ARGV[$i] eq "-v") {
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$GCCOptions .= " " . $ARGV[$i];
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$Verbose = 1;
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} elsif ($ARGV[$i] eq "-o") {
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$OutputFile = $ARGV[$i + 1];
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} elsif ($ARGV[$i] eq "-save-temps") {
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$GCCOptions .= " " . $ARGV[$i];
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$SaveTemps = 1;
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} elsif ($ARGV[$i] =~ /\.bc$/) {
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push (@BytecodeFiles, $ARGV[$i]);
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} elsif ($ARGV[$i] =~ /^-L/) {
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$GCCOptions .= " " . $ARGV[$i];
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push (@LibDirs, $ARGV[$i]);
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} elsif ($ARGV[$i] =~ /^-l/) {
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$GCCOptions .= " " . $ARGV[$i];
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push (@Libs, $ARGV[$i]);
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} elsif ($ARGV[$i] =~ /\.(c|cpp|cc|i|ii|C)$/) {
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$LastCFile = $ARGV[$i];
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}
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}
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sub GetDefaultOutputFileName {
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my $DefaultOutputFileBase;
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if ($ProgramName =~ /llvm-native-gcc/) {
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$DefaultOutputFileBase = $LastCFile;
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} elsif ($ProgramName =~ /native-build/) {
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$DefaultOutputFileBase = $BytecodeFiles[0];
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}
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my $def = $DefaultOutputFileBase;
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die "Can't figure out name of output file.\n"
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unless $DefaultOutputFileBase
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&& (($ProgramName !~ /native-build/)
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|| $#BytecodeFiles == 0);
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print "Warning: defaulting output file name ",
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"based on '$DefaultOutputFileBase'\n" if $Verbose;
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if ($ProgramName =~ /llvm-native-gcc/) {
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$def =~ s/\.(c|cpp|cc|i|ii|C)$/.o/;
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} elsif ($ProgramName =~ /native-build/) {
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$def =~ s/\.bc$/.$Backend/;
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if ($CompileDontLink) {
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$def .= ".o";
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}
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}
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return $def;
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}
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# run a command, optionally echoing, and quitting if it fails:
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sub run {
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my $command = join(" ", @_);
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print "$command\n" if $Verbose;
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$command =~ s/\"/\\\"/g;
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system $command and die "$0: $command failed";
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}
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sub LinkBytecodeFilesIntoTemporary {
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my $FinalOutputFileName = shift @_;
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my @BytecodeFiles = @_;
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my $BCFiles = join (" ", @BytecodeFiles);
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my $LinkedBCFile;
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if ($SaveTemps) {
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$LinkedBCFile = "${FinalOutputFileName}.llvm.bc";
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} else {
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$LinkedBCFile = "/tmp/nativebuild-$$.llvm.bc";
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}
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run "llvm-link -o $LinkedBCFile $BCFiles";
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return $LinkedBCFile;
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}
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sub CompileBytecodeToNative {
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my ($BCFile, $Backend, $OutputFile) = @_;
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my $GeneratedCode;
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if ($Backend eq 'cbe') {
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if ($SaveTemps) {
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$GeneratedCode = "${OutputFile}.c";
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} else {
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$GeneratedCode = "/tmp/nativebuild-$$.c";
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}
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run "llc -enable-correct-eh-support -march=c -f -o $GeneratedCode $BCFile";
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} elsif ($Backend eq 'llc') {
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if ($SaveTemps) {
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$GeneratedCode = "${OutputFile}.s";
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} else {
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$GeneratedCode = "/tmp/nativebuild-$$.s";
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}
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run "llc -enable-correct-eh-support -f -o $GeneratedCode $BCFile";
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}
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my $LibDirs = join (" ", @LibDirs);
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my $Libs = join (" ", @Libs);
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run "gcc $GCCOptions $GeneratedCode -o $OutputFile $LibDirs $Libs";
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run "rm $BCFile $GeneratedCode"
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unless $SaveTemps;
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}
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sub CompileCToNative {
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my ($LLVMGCCCommand, $Backend, $OutputFile) = @_;
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run $LLVMGCCCommand;
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if ($PreprocessOnly) {
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return;
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}
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my $BCFile = "${OutputFile}.llvm.bc";
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if ($CompileDontLink) {
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run "mv ${OutputFile} $BCFile";
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} else { # gccld messes with the output file name
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run "mv ${OutputFile}.bc $BCFile";
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}
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my $GeneratedCode;
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if ($Backend eq 'cbe') {
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$GeneratedCode = "${OutputFile}.cbe.c";
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run "llc -enable-correct-eh-support -march=c -f -o $GeneratedCode $BCFile";
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} elsif ($Backend eq 'llc') {
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$GeneratedCode = "${OutputFile}.llc.s";
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run "llc -enable-correct-eh-support -f -o $GeneratedCode $BCFile";
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}
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my $NativeGCCOptions = "";
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if ($CompileDontLink) {
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$NativeGCCOptions = "-c";
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}
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run "gcc $NativeGCCOptions $GeneratedCode -o $OutputFile";
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run "rm ${OutputFile}.llvm.bc $GeneratedCode"
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unless $SaveTemps;
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}
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# guess the name of the output file, if -o was not specified.
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$OutputFile = GetDefaultOutputFileName () unless $OutputFile;
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print "Output file is $OutputFile\n" if $Verbose;
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# do all the dirty work:
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if ($ProgramName eq /native-build/) {
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my $LinkedBCFile = LinkBytecodeFilesIntoTemporary (@BytecodeFiles);
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CompileBytecodeToNative ($LinkedBCFile, $Backend, $OutputFile);
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} elsif ($ProgramName =~ /llvm-native-gcc/) {
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# build the llvm-gcc command line.
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$LLVMGCCCommand = join (" ", ("llvm-gcc", @ARGV));
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CompileCToNative ($LLVMGCCCommand, $Backend, $OutputFile);
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}
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# we're done.
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exit 0;
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__END__
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=pod
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=head1 NAME
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llvm-native-gcc
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=head1 SYNOPSIS
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llvm-native-gcc [OPTIONS...] FILE
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native-build [OPTIONS...] FILE
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=head1 DESCRIPTION
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llvm-native-gcc is a wrapper around the LLVM command-line tools which generates
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a native object (.o) file by compiling FILE with llvm-gcc, and then running
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an LLVM back-end (CBE by default) over the resulting bitcode, and then
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compiling the resulting code to a native object file.
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If called as "native-build", it compiles bitcode to native code, and takes
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different options.
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=head1 OPTIONS
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llvm-native-gcc takes the same options as llvm-gcc. All options
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except -mllvm-backend=... are passed on to llvm-gcc.
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=over 4
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=item -mllvm-backend=BACKEND
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Use BACKEND for native code generation.
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=item -v
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Print command lines that llvm-native-gcc runs.
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=item -o FILE
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llvm-native-gcc tries to guess the name of the llvm-gcc output file by looking
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for this option in the command line. If it can't find it, it finds the last C
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or C++ source file named on the command line, and turns its suffix into .o. See
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BUGS.
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=item -save-temps
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Save temporary files used by llvm-native-gcc (and llvm-gcc, and gcc).
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=back
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=head1 BUGS
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llvm-native-gcc only handles the case where llvm-gcc compiles a single
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file per invocation. llvm-native-gcc has weak command-line argument
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parsing and is a poor substitute for making gcc/gcc.c do this stuff.
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This manual page does not adequately document native-build mode.
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llvm-native-gcc is pretty gross because it represents the blind merging of two
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other scripts that predated it. It could use some code clean-up.
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=head1 SEE ALSO
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gcc(1)
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=head1 AUTHOR
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Brian R. Gaeke
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=cut
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