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=head1 NAME |
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|
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Faster - do some things faster |
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|
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=head1 SYNOPSIS |
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|
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use Faster; |
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|
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=head1 DESCRIPTION |
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|
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=over 4 |
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|
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=cut |
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|
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package Faster; |
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|
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use strict; |
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|
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BEGIN { |
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our $VERSION = '0.01'; |
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|
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require XSLoader; |
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XSLoader::load __PACKAGE__, $VERSION; |
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} |
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|
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use B (); |
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|
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our $source; |
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our $label_next; |
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our $label_last; |
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our $label_redo; |
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|
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my %flag; |
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|
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for (split /\n/, <<EOF) { |
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leavesub unsafe |
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leavesublv unsafe |
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return unsafe |
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flip unsafe |
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goto unsafe |
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last unsafe |
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redo unsafe |
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next unsafe |
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eval unsafe |
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leaveeval unsafe |
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entertry unsafe |
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substconst unsafe |
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formline unsafe |
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grepstart unsafe |
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EOF |
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my (undef, $op, @flags) = split /\s+/; |
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|
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undef $flag{$_}{$op} |
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for ("known", @flags); |
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} |
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|
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sub out_next { |
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my ($op) = @_; |
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|
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$source .= " PL_op = (OP *)${$op->next}L;\n"; |
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$source .= " goto op_${$op->next};\n"; |
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} |
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|
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sub op_nextstate { |
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my ($op) = @_; |
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|
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$source .= " PL_curcop = (COP *)PL_op;\n"; |
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$source .= " PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;\n"; |
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$source .= " FREETMPS;\n"; |
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|
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out_next $op; |
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} |
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|
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sub op_pushmark { |
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my ($op) = @_; |
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|
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$source .= " PUSHMARK (PL_stack_sp);\n"; |
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|
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out_next $op; |
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} |
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|
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sub op_const { |
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my ($op) = @_; |
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|
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$source .= " { dSP; XPUSHs ((SV *)${$op->sv}L); PUTBACK; }\n"; |
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|
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out_next $op; |
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} |
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|
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*op_gv = \&op_const; |
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|
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sub op_stringify { |
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my ($op) = @_; |
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|
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$source .= " { dSP; dTARGET; sv_copypv (TARG, TOPs); SETTARG; }\n"; |
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|
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out_next $op; |
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} |
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|
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# pattern const+ (or general push1) |
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# pattern pushmark return(?) |
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# pattern pushmark gv rv2av pushmark padsv+o.รค. aassign |
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|
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# pattern const method_named |
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sub xop_method_named { |
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my ($op) = @_; |
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|
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my $ppaddr = ppaddr $op->type; |
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|
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$source .= <<EOF; |
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{ |
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dSP; |
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|
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if (SvROK (TOPm1s) && SvOBJECT (SvRV (TOPm1s))) |
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{ |
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static SV *last_stash, SV *last_res; |
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SV *stash = SvSTASH (SvRV (TOPm1s)); |
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|
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// simple polymorphic inline cache |
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if (stash == last_stash) |
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{ |
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dTARGET; |
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SETTARG (last_res); |
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} |
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else |
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{ |
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PUTBACK; |
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((PPFUNC)${ppaddr}L)(aTHX);\n"; |
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SPAGAIN; |
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|
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last_stash = stash; |
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last_res = TOPs; |
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} |
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} |
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} |
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EOF |
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|
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out_next $op; |
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} |
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|
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sub entersub { |
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my ($cv) = @_; |
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|
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my %opsseen; |
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my @ops; |
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my @todo = $cv->START; |
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|
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while (my $op = shift @todo) { |
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for (; $$op; $op = $op->next) { |
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last if $opsseen{$$op}++; |
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push @ops, $op; |
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my $name = $op->name; |
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if (B::class($op) eq "LOGOP") { |
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push @todo, $op->other; |
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} elsif ($name eq "subst" and ${ $op->pmreplstart }) { |
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push @todo, $op->pmreplstart; |
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} elsif ($name =~ /^enter(loop|iter)$/) { |
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# if ($] > 5.009) { |
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# $labels{${$op->nextop}} = "NEXT"; |
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# $labels{${$op->lastop}} = "LAST"; |
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# $labels{${$op->redoop}} = "REDO"; |
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# } else { |
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# $labels{$op->nextop->seq} = "NEXT"; |
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# $labels{$op->lastop->seq} = "LAST"; |
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# $labels{$op->redoop->seq} = "REDO"; |
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# } |
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} |
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} |
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} |
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|
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local $source; |
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|
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$source = "typedef OP *(*PPFUNC)(pTHX);\n\n"; |
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|
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$source .= "OP *func (pTHX)\n{\n dTHX;\n"; |
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|
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for my $op (@ops) { |
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my $name = $op->name; |
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my $ppaddr = ppaddr $op->type; |
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|
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$source .= "op_$$op: /* $name */\n"; |
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|
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if (my $can = __PACKAGE__->can ("op_$name")) { |
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$can->($op); |
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} elsif ("LOGOP" eq B::class $op or exists $flag{otherop}{$name}) { |
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$source .= " PL_op = ((PPFUNC)${ppaddr}L)(aTHX);\n"; |
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$source .= " if (PL_op == (OP *)${$op->other}L) goto op_${$op->other};\n"; |
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$source .= " goto op_${$op->next};\n"; |
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} elsif (exists $flag{unsafe}{$name}) { |
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$source .= " return ((PPFUNC)${ppaddr}L)(aTHX);\n"; |
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} else { |
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$source .= " PL_op = ((PPFUNC)${ppaddr}L)(aTHX);\n"; |
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$source .= " goto op_${$op->next};\n"; |
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} |
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} |
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|
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$source .= "}\n"; |
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|
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print <<EOF; |
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#include "EXTERN.h" |
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#include "perl.h" |
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#include "XSUB.h" |
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EOF |
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print $source; |
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} |
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|
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hook_entersub; |
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|
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1; |
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|
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=back |
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|
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=head1 LIMITATIONS |
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|
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Tainting and debugging will disable Faster. |
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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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|
