uses it heavily, to generate inlined versions of accessors and constructors,
which speeds code up at runtime by a significant amount. String eval is not
without its issues however - it's difficult to control the scope it's used in
-(which determines which variables are in scope inside the eval), and it can be
-quite slow, especially if doing a large number of evals.
+(which determines which variables are in scope inside the eval), and it's easy
+to miss compilation errors, since eval catches them and sticks them in $@
+instead.
-This module attempts to solve both of those problems. It provides an
-C<eval_closure> function, which evals a string in a clean environment, other
-than a fixed list of specified variables. It also caches the result of the
-eval, so that doing repeated evals of the same source, even with a different
-environment, will be much faster (but note that the description is part of the
-string to be evaled, so it must also be the same (or non-existent) if caching
-is to work properly).
+This module attempts to solve these problems. It provides an C<eval_closure>
+function, which evals a string in a clean environment, other than a fixed list
+of specified variables. Compilation errors are rethrown automatically.
=cut
}
sub _clean_eval_closure {
- my ($source, $captures) = @_;
+ my ($source, $captures) = @_;
+
+ my @capture_keys = sort keys %$captures;
if ($ENV{EVAL_CLOSURE_PRINT_SOURCE}) {
- _dump_source(_make_compiler_source(@_));
+ _dump_source(_make_compiler_source($source, @capture_keys));
}
- my @capture_keys = sort keys %$captures;
my ($compiler, $e) = _make_compiler($source, @capture_keys);
my $code;
if (defined $compiler) {
return ($code, $e);
}
-{
- my %compiler_cache;
-
- sub _make_compiler {
- my $source = _make_compiler_source(@_);
+sub _make_compiler {
+ my $source = _make_compiler_source(@_);
- unless (exists $compiler_cache{$source}) {
- local $@;
- local $SIG{__DIE__};
- my $compiler = eval $source;
- my $e = $@;
- $compiler_cache{$source} = [ $compiler, $e ];
- }
+ return @{ _clean_eval($source) };
+}
- return @{ $compiler_cache{$source} };
- }
+$Eval::Closure::SANDBOX_ID = 0;
+
+sub _clean_eval {
+ $Eval::Closure::SANDBOX_ID++;
+ return eval <<EVAL;
+package Eval::Closure::Sandbox_$Eval::Closure::SANDBOX_ID;
+local \$@;
+local \$SIG{__DIE__};
+my \$compiler = eval \$_[0];
+my \$e = \$@;
+[ \$compiler, \$e ];
+EVAL
}
sub _make_compiler_source {