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Backtrace.pm
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Backtrace.pm
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my class Exception { ... }
my class Backtrace { ... }
my class CompUnit::RepositoryRegistry is repr('Uninstantiable') { ... }
my $RAKUDO-VERBOSE-STACKFRAME;
my class Backtrace::Frame {
has Str $.file;
has Int $.line;
has Mu $.code;
has Str $.subname;
method !SET-SELF($!file,$!line,\code,$!subname) {
$!code := code;
self
}
multi method new(Backtrace::Frame: \file,\line,\code,\subname) {
nqp::create(self)!SET-SELF(file,line,code,subname)
}
multi method new(Backtrace::Frame: |c) {
self.bless(|c)
}
method subtype(Backtrace::Frame:D:) {
my $s = $!code.^name.lc.split('+', 2).cache[0];
$s eq 'mu' ?? '' !! $s;
}
method package(Backtrace::Frame:D:) {
$.code.package;
}
multi method Str(Backtrace::Frame:D:) {
my $s = self.subtype;
$s ~= ' ' if $s.chars;
my $text = " in {$s}$.subname at {$.file} line $.line\n";
if $RAKUDO-VERBOSE-STACKFRAME -> $extra {
my $io = $!file.IO;
if $io.e {
my @lines = $io.lines;
my $from = max $!line - $extra, 1;
my $to = min $!line + $extra, +@lines;
for $from..$to -> $line {
my $star = $line == $!line ?? '*' !! ' ';
$text ~= "$line.fmt('%5d')$star @lines[$line - 1]\n";
}
$text ~= "\n";
}
}
$text;
}
method is-hidden(Backtrace::Frame:D:) {
?$!code.?is-hidden-from-backtrace
}
method is-routine(Backtrace::Frame:D:) {
nqp::p6bool(nqp::istype($!code,Routine))
}
method is-setting(Backtrace::Frame:D:) {
$!file.starts-with("SETTING::")
}
}
my class Backtrace {
has Mu $!bt;
has Mu $!frames;
has Int $!bt-next; # next bt index to vivify
method !SET-SELF($!bt,$!bt-next) {
once $RAKUDO-VERBOSE-STACKFRAME =
+(%*ENV<RAKUDO_VERBOSE_STACKFRAME> // 0);
$!frames := nqp::list;
self
}
multi method new() {
try X::AdHoc.new(:payload("Died")).throw;
nqp::create(self)!SET-SELF(
nqp::backtrace(nqp::getattr(nqp::decont($!),Exception,'$!ex')),
1)
}
multi method new(Int:D $offset) {
try X::AdHoc.new(:payload("Died")).throw;
nqp::create(self)!SET-SELF(
nqp::backtrace(nqp::getattr(nqp::decont($!),Exception,'$!ex')),
1 + $offset)
}
multi method new(Mu \ex) {
nqp::create(self)!SET-SELF(
ex.^name eq 'BOOTException'
?? nqp::backtrace(nqp::decont(ex))
!! nqp::backtrace(nqp::getattr(nqp::decont(ex),Exception,'$!ex')),
0)
}
multi method new(Mu \ex, Int:D $offset) {
nqp::create(self)!SET-SELF(
ex.^name eq 'BOOTException'
?? nqp::backtrace(nqp::decont(ex))
!! nqp::backtrace(nqp::getattr(nqp::decont(ex),Exception,'$!ex')),
$offset)
}
# note that backtraces are nqp::list()s, marshalled to us as a List
multi method new(List:D $bt) {
nqp::create(self)!SET-SELF($bt,0)
}
multi method new(List:D $bt, Int:D $offset) {
nqp::create(self)!SET-SELF($bt,$offset)
}
method AT-POS($pos) {
return nqp::atpos($!frames,$pos) if nqp::existspos($!frames,$pos);
my int $elems = $!bt.elems;
return Nil if $!bt-next >= $elems; # bt-next can init > elems
my int $todo = $pos - nqp::elems($!frames) + 1;
return Nil if $todo < 1; # in case absurd $pos passed
while $!bt-next < $elems {
my $frame := $!bt.AT-POS($!bt-next++);
my $sub := $frame<sub>;
next unless defined $sub;
my Mu $do := nqp::getattr(nqp::decont($sub), ForeignCode, '$!do');
next if nqp::isnull($do);
my $annotations := $frame<annotations>;
next unless $annotations;
my $file := $annotations<file>;
next unless $file;
if CompUnit::RepositoryRegistry.file-for-spec($file) -> $path {
$file := $path.abspath;
}
# now *that's* an evil hack
next if $file.ends-with('BOOTSTRAP.nqp')
|| $file.ends-with('QRegex.nqp')
|| $file.ends-with('Perl6/Ops.nqp');
if $file.ends-with('NQPHLL.nqp') || $file.ends-with('NQPHLL.moarvm') {
# This could mean we're at the end of the interesting backtrace,
# or it could mean that we're in something like sprintf (which
# uses an NQP grammar to parse the format string).
while $!bt-next < $elems {
my $frame := $!bt.AT-POS($!bt-next++);
my $annotations := $frame<annotations>;
next unless $annotations;
my $file := $annotations<file>;
next unless $file;
if $file.ends-with('.setting') {
$!bt-next--; # re-visit this frame
last;
}
}
next;
}
my $line := $annotations<line>;
next unless $line;
my $name := nqp::p6box_s(nqp::getcodename($do));
if $name eq 'handle-begin-time-exceptions' {
$!bt-next = $elems;
last;
}
my $code;
try {
$code := nqp::getcodeobj($do);
$code := Any unless nqp::istype($code, Mu);
};
nqp::push($!frames,
Backtrace::Frame.new(
$file,
$line.Int,
$code,
$name.starts-with("_block") ?? '<anon>' !! $name,
)
);
last unless $todo = $todo - 1;
}
# found something
if nqp::existspos($!frames,$pos) {
nqp::atpos($!frames,$pos);
}
# we've reached the end, don't show the last <unit-outer> if there is one
else {
nqp::pop($!frames) if $!frames;
Nil;
}
}
method next-interesting-index(Backtrace:D:
Int $idx is copy = 0, :$named, :$noproto, :$setting) {
++$idx;
while self.AT-POS($idx++) -> $cand {
next if $cand.is-hidden; # hidden is never interesting
next if $noproto # no proto's please
&& $cand.code.?is_dispatcher; # if a dispatcher
next if !$setting # no settings please
&& $cand.is-setting; # and in setting
my $n := $cand.subname;
next if $named && !$n; # only want named ones and no name
next if $n eq '<unit-outer>'; # outer calling context
return $idx - 1;
}
Nil;
}
method outer-caller-idx(Backtrace:D: Int $startidx) {
if self.AT-POS($startidx).code -> $start {
my %outers;
my $current = $start.outer;
while $current.DEFINITE {
%outers{$current.static_id} = $start;
$current = $current.outer;
}
my @outers;
my $i = $startidx;
while self.AT-POS($i++) -> $cand {
my $code = $cand.code;
next unless $code.DEFINITE && %outers{$code.static_id}.DEFINITE;
@outers.push: $i - 1;
last if $cand.is-routine;
}
@outers;
}
else {
$startidx.list;
}
}
method nice(Backtrace:D: :$oneline) {
my $setting = %*ENV<RAKUDO_BACKTRACE_SETTING>;
try {
my @frames;
my Int $i = self.next-interesting-index(-1);
while $i.defined {
$i = self.next-interesting-index($i, :$setting) if $oneline;
last unless $i.defined;
my $prev = self.AT-POS($i);
if $prev.is-routine {
@frames.push: $prev;
} else {
my @outer_callers := self.outer-caller-idx($i);
my $target_idx = @outer_callers.keys.grep({self.AT-POS($i).code.^isa(Routine)})[0];
$target_idx ||= @outer_callers[0] || $i;
my $current = self.AT-POS($target_idx);
@frames.append: $current.clone(line => $prev.line);
$i = $target_idx;
}
last if $oneline;
$i = self.next-interesting-index($i, :$setting);
}
CATCH {
default {
return "<Internal error while creating backtrace: $_.message() $_.backtrace.full().\n"
~ "Please report this as a bug (mail to rakudobug@perl.org)\n",
~ "and re-run with the --ll-exception command line option\n"
~ "to get more information about your error>";
}
}
@frames.join;
}
}
multi method Str(Backtrace:D:) { self.nice }
multi method flat(Backtrace:D:) { self.list }
multi method map(Backtrace:D: &block) {
my $pos = 0;
gather while self.AT-POS($pos++) -> $cand {
take block($cand);
}
}
multi method first(Backtrace:D: Mu $test) {
my $pos = 0;
while self.AT-POS($pos++) -> $cand {
return-rw $cand if $cand ~~ $test;
}
Nil;
}
multi method list(Backtrace:D:) {
self.AT-POS(100); # will stop when done, do we need more than 100???
nqp::p6bindattrinvres(nqp::create(List), List, '$!reified', $!frames)
}
method first-none-setting-line(Backtrace:D:) {
(self.first({ !.is-hidden && !.is-setting }) // "\n").Str;
}
method concise(Backtrace:D:) {
(self.grep({ !.is-hidden && .is-routine && !.is-setting }) // "\n").join;
}
method full(Backtrace:D:) { self.list.join }
method summary(Backtrace:D:) {
(self.grep({ !.is-hidden && (.is-routine || !.is-setting)}) // "\n").join;
}
method is-runtime (Backtrace:D:) {
my $bt = $!bt;
for $bt.keys {
my $p6sub := $bt[$_]<sub>;
if nqp::istype($p6sub, ForeignCode) {
try {
my Mu $sub := nqp::getattr(nqp::decont($p6sub), ForeignCode, '$!do');
my str $name = nqp::getcodename($sub);
return True if nqp::iseq_s($name, 'THREAD-ENTRY');
return True if nqp::iseq_s($name, 'eval');
return True if nqp::iseq_s($name, 'print_control');
return False if nqp::iseq_s($name, 'compile');
}
}
}
False;
}
}
# vim: ft=perl6 expandtab sw=4