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=head1 NAME |
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|
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AnyEvent::GDB - asynchronous GDB machine interface interface |
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|
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=head1 SYNOPSIS |
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|
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use AnyEvent::GDB; |
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|
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=head1 DESCRIPTION |
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|
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This module is an L<AnyEvent> user, you need to make sure that you use and |
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run a supported event loop. |
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|
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=cut |
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|
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package AnyEvent::GDB; |
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|
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use common::sense; |
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|
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use Fcntl (); |
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use Scalar::Util (); |
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|
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use AnyEvent (); |
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use AnyEvent::Util (); |
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|
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our $VERSION = '0.0'; |
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|
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=head2 METHODS |
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|
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=over 4 |
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|
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=item $gdb = new AnyEvent::GDB |
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|
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=over 4 |
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|
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=item exec => $path (default: "gdb") |
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|
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The path of the GDB executable. |
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|
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=item args => [$string...] (default: ["-n"]) |
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|
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An optional array of parameters to pass to GDB. This should not be |
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used to load a program executable, use the C<file_exec_and_symbols>, |
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C<target_attach> or similar MI commands instead. |
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|
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=item on_error => $callback->($dbh, $filename, $line, $fatal)#d# |
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|
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=back |
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|
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=cut |
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|
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sub new { |
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my ($class, %arg) = @_; |
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|
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my $self = bless { |
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%arg, |
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}, $class; |
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|
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my $exe = delete $self->{exec} // "gdb"; |
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my $arg = delete $self->{args} // [qw(-n)]; |
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|
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($self->{fh}, my $fh2) = AnyEvent::Util::portable_socketpair; |
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|
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$self->{pid} = fork; |
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|
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open my $stdin , "<&STDIN" ; |
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open my $stdout, ">&STDOUT"; |
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|
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unless ($self->{pid}) { |
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if (defined $self->{pid}) { |
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open STDIN , "<&", $fh2; |
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open STDOUT, ">&", $fh2; |
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fcntl $stdin , Fcntl::F_SETFD, 0; |
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fcntl $stdout, Fcntl::F_SETFD, 0; |
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exec $exe, qw(--interpreter=mi2 -q), @$arg; |
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kill 9, 0; # don't want to load the POSIX module just for this |
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} else { |
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$self->fatal ("cannot fork: $!"); |
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} |
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} |
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|
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AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
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|
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{ |
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Scalar::Util::weaken (my $self = $self); |
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$self->{rw} = AE::io $self->{fh}, 0, sub { |
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my $len = sysread $self->{fh}, $self->{rbuf}, 256, length $self->{rbuf}; |
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|
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defined $len || $self->fatal ("unexpected EOF from GDB"); |
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|
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$self->feed ("$1") |
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while $self->{rbuf} =~ s/^([^\r\n]*)\r?\n//; |
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}; |
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|
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$self->{wcb} = sub { |
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my $len = syswrite $self->{fh}, $self->{wbuf}; |
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substr $self->{wbuf}, 0, $len, ""; |
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delete $self->{ww} unless length $self->{wbuf}; |
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}; |
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} |
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|
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$self->cmd_raw ((sprintf "run <&%d >&%d", fileno $stdin, fileno $stdout), sub { }); |
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|
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$self |
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} |
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|
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#sub DESTROY { |
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#)} |
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|
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sub send { |
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my ($self, $data) = @_; |
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|
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print "s<$data>\n";#d# |
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|
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$self->{wbuf} .= $data; |
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$self->{ww} ||= AE::io $self->{fh}, 1, $self->{wcb}; |
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} |
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|
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our %C_ESCAPE = ( |
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"\\" => "\\", |
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'"' => '"', |
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"'" => "'", |
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"?" => "?", |
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|
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a => "\x07", |
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b => "\x08", |
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t => "\x09", |
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n => "\x0a", |
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v => "\x0b", |
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f => "\x0c", |
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r => "\x0d", |
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); |
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|
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sub _parse_c_string { |
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my $r = ""; |
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|
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# syntax is not documented, so we do full C99, except unicode |
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|
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while () { |
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if (/\G([^"\\\n]+)/gc) { |
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$r .= $1; |
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} elsif (/\G\\([abtnvfr\\"'?])/gc) { |
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$r .= $C_ESCAPE{$1}; |
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} elsif (/\G\\([0-8]{1,3})/gc) { |
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$r .= chr oct $1; |
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} elsif (/\G\\x([0-9a-fA-F]+)/gc) { |
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$r .= chr hex $1; |
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} elsif (/\G"/gc) { |
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last; |
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} else { |
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die "invalid string syntax\n"; |
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} |
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} |
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|
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$r |
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} |
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|
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sub _parse_value { |
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if (/\G"/gc) { # c-string |
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&_parse_c_string |
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|
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} elsif (/\G\{/gc) { # tuple |
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my $r = &_parse_results; |
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|
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/\G\}/gc |
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or die "tuple does not end with '}'\n"; |
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|
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$r |
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|
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} elsif (/\G\[/gc) { # list |
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my @r; |
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|
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until (/\G\]/gc) { |
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# if GDB outputs "result" in lists, let me know and uncomment the following lines |
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# # list might also contain key value pairs, but apparently |
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# # those are supposed to be ordered, so we use an array in perl. |
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# push @r, $1 |
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# if /\G([^=,\[\]\{\}]+)=/gc; |
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|
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push @r, &_parse_value; |
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|
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/\G,/gc |
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or last; |
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} |
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|
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/\G\]/gc |
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or die "list does not end with ']'\n"; |
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|
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\@r |
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|
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} else { |
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die "value expected\n"; |
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} |
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} |
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|
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sub _parse_results { |
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my %r; |
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|
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# syntax for string is undocumented |
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while (/\G([^=,\[\]\{\}]+)=/gc) { |
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my $k = $1; |
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|
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$r{$k} = &_parse_value; |
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|
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/\G,/gc |
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or last; |
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} |
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|
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\%r |
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} |
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|
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my %type_map = qw( |
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* exec_async |
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+ status_async |
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= notify_async |
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); |
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|
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sub feed { |
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my ($self, $line) = @_; |
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use Data::Dump; #d# |
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|
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warn "parse<$line>\n";#d# |
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|
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for ($line) { |
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if (/^\(gdb\)\s*$/gc) { # docs say "(gdb)", but reality says "(gdb) " |
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# nop |
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} else { |
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/^([0-9]*)/gc; # [token], actually ([0-9]+)? |
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my $token = $1; |
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|
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eval { |
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if (/\G\^(done|running|connected|error|exit)/gc) { # result |
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my $class = $1 eq "running" ? "done" : $1; |
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# documented for error is an incompatible format, but in reality it is sane |
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|
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my $results = /\G,/gc ? &_parse_results : {}; |
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|
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if (my $cb = delete $self->{cb}{$token}) { |
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# unfortunately, gdb sometimes outputs multiple result records for one command |
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$cb->($class, $results, delete $self->{console_stream}); |
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} |
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|
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} elsif (/\G([*+=])([^,]+)/gc) { # *exec-async, +status-async, =notify-async |
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my ($type, $class) = ($type_map{$1}, $2); |
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|
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my $results = /\G,/gc ? &_parse_results : {}; |
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|
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$self->event ($type => $results); |
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|
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} elsif (/\G~"/gc) { |
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push @{ $self->{console_stream} }, &_parse_c_string; |
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} elsif (/\G&"/gc) { |
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$self->event (log_stream => &_parse_c_string); |
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} elsif (/\G\@"/gc) { |
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$self->event (target_stream => &_parse_c_string); |
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} |
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}; |
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|
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/\G(.{0,16})/gcs; |
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$@ = "extra data\n" if !$@ and length $1; |
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|
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if ($@) { |
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chop $@; |
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die "parse error: $@, at ...$1\n"; |
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} |
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} |
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} |
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} |
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|
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sub _q($) { |
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return $_[0] |
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if $_[0] =~ /^[A-Za-z0-9_]+$/; # we are a lot more strict than the spec |
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|
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local $_ = shift; |
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utf8::encode $_; # just in case |
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s/([^\x20-\x21\x23-\x5b\x5d-\x7e])/sprintf "\\x%02x", ord $1/ge; |
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"\"$_\"" |
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} |
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|
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=item $gdb->cmd_raw ($command, $cb->($class, $results, $console)) |
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|
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Execute a raw command: C<$command> is sent unchanged to GDB. See C<cmd_> |
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for a description of the callback arguments. |
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|
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Example: execute a CLI command and print its output. |
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|
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$gdb->cmd_raw ("info sh", sub { |
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print "$_[3]\n"; |
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}); |
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|
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=cut |
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|
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sub cmd_raw { |
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my ($self, $cmd, $cb) = @_; |
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|
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my $token = ++$self->{token}; |
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$self->send ("$token$cmd\n"); |
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$self->{cb}{$token} = $cb; |
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} |
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|
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=item $gdb->cmd ($command => [$option...], $parameter..., $cb->($class, $results, $console)) |
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|
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Execute a MI command and invoke the callback with the results. |
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|
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C<$command> is a MI command name, with C<-> replaced by C<_> and without |
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the intiial C<->, i.e. the GDB MI command C<-file-exec-and-symbols> |
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becomes C<file_exec_and_symbols>. |
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|
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The second argument is an optional array reference with options (i.e. it |
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can simply be missing). Each C<$option> is either an option name (similar |
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rules as with command names, i.e. no initial C<-->) or an array reference |
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with the first element being the option name, and the remaining elements |
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being parameters: [$option, $parameter...]. |
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|
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The remaining arguments, excluding the last one, are simply the parameters |
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passed to GDB. |
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|
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All options and parameters will be properly quoted. |
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|
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When the command is done, the callback C<$cb> will be invoked with |
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C<$class> being one of C<done>, C<connected>, C<error> or C<exit> |
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(note: not C<running>), C<$results> being a has reference with all the |
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C<variable=value> pairs from the result list. |
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|
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C<$console> is an array reference with all the GDB console messages |
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written while command executes (for MI commands, this should always be |
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C<undef> and can be ignored). |
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|
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Example: #todo# |
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|
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=cut |
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|
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sub cmd { |
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my $cb = pop; |
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my ($self, $cmd, @arg) = @_; |
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|
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$cmd = "-$cmd "; |
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$cmd =~ s/_/-/g; |
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|
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my $opt = ref $arg[0] ? shift @arg : []; |
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|
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for (@$opt) { |
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$cmd .= "-"; |
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$cmd .= (_q $_) . " " |
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for (ref) ? @$_ : $_; |
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} |
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|
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# the mi syntax is inconsistent, providing "--" in case |
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# parameters start with "-", but not allowing "-" as first |
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# char of a parameter. in fact, "--" is flagged as unknown |
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# option. |
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if (@arg) { |
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# $cmd .= "-- "; |
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|
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$cmd .= (_q $_) . " " |
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for @arg; |
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} |
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|
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# remove trailing " " |
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substr $cmd, -1, 1, ""; |
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|
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$self->cmd_raw ($cmd, $cb); |
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} |
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|
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=item ($class, $results, $console) = $gdb->cmd_sync ($command => [$option...], $parameter...]) |
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|
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Like C<cmd>, but blocks execution until the command has been executed, and returns the results. |
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|
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This is purely a convenience method for small scripts: since it blocks |
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execution using a condvar, it is not suitable to be used inside callbacks |
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or modules, unless L<Coro> is used. |
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|
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=cut |
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|
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sub cmd_sync { |
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push @_, my $cv = AE::cv; |
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&cmd; |
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$cv->recv |
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} |
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|
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sub event { |
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my ($self, $event, @args) = @_; |
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|
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use Data::Dump; |
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ddx [$event, @args]; |
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|
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} |
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|
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=back |
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|
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=head1 SEE ALSO |
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|
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L<AnyEvent>, L<http://sourceware.org/gdb/current/onlinedocs/gdb/GDB_002fMI.html#GDB_002fMI>. |
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|
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=head1 AUTHOR |
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|
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Marc Lehmann <schmorp@schmorp.de> |
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http://home.schmorp.de/ |
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|
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=cut |
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|
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1 |
