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CSwitch.pm
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CSwitch.pm
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# Copyright (C) 2001-2009, Parrot Foundation.
# $Id$
=head1 NAME
Parrot::OpTrans::CSwitch - C Switch Transform
=head1 DESCRIPTION
C<Parrot::OpTrans::CSwitch> inherits from C<Parrot::OpTrans::CPrederef>
to provide a mixture of predereferenced register addressing and a
C<switch>ed run loop.
=head2 Instance Methods
=over 4
=cut
package Parrot::OpTrans::CSwitch;
use strict;
use warnings;
use Parrot::OpTrans;
use base qw( Parrot::OpTrans::CPrederef );
sub new {
my $class = shift;
my $self = $class->SUPER::new(@_);
$self->{split_count} ||= 0;
return $self;
}
=item C<core_type()>
The core type is C<PARROT_SWITCH_CORE>.
=cut
sub core_type {
return 'PARROT_SWITCH_CORE';
}
=item C<core_prefix()>
The prefix is C<'switch_'>.
=cut
sub core_prefix {
return "switch_";
}
=item C<suffix()>
The suffix is C<'_switch'>.
=cut
sub suffix {
return "_switch";
}
=item C<defines()>
Returns the C C<#define> macros required by the ops.
=cut
sub defines {
my ( $self, $pred_def );
$self = shift;
$pred_def = $self->SUPER::defines();
my $type = __PACKAGE__;
return $pred_def . <<END;
/* defines - $0 -> $type */
# define opcode_to_prederef(i, op) (op ? \\
(opcode_t*) (op - Parrot_pcc_get_pred_offset(interp, i->ctx)) : (opcode_t*)NULL)
END
}
=item C<goto_address($address)>
Transforms the C<goto ADDRESS($address)> macro in an ops file into the
relevant C code.
=cut
sub goto_address {
my ( $self, $addr ) = @_;
#print STDERR "pbcc: map_ret_abs($addr)\n";
if ( $addr eq '0' ) {
return "return (0);";
}
else {
return <<EOC;
{
cur_opcode = opcode_to_prederef(interp, $addr);
goto SWITCH_RELOAD;
}
EOC
}
}
=item C<goto_offset($offset)>
Transforms the C<goto OFFSET($offset)> macro in an ops file into the
relevant C code.
=cut
sub goto_offset {
my ( $self, $offset ) = @_;
return "{ cur_opcode += $offset; goto SWITCH_AGAIN; }";
}
=item C<init_func_init1($base)>
Returns the C code for the init function.
=cut
sub init_func_init1 {
my ( $self, $base ) = @_;
my $cg_func = $self->core_prefix . $base;
my $bs = $base . $self->suffix . '_';
return <<END_C;
if (!${bs}op_lib.op_func_table)
${bs}op_lib.op_func_table = (op_func_t *)&${bs}op_lib;
END_C
}
=item C<run_core_func_start()>
Returns the C code prior to the run core function.
=cut
sub run_core_func_start {
my $type = __PACKAGE__;
return <<END_C;
/* run_core_func_start - $0 -> $type */
#if defined(__GNUC__) && defined(I386) && defined(PARROT_SWITCH_REGS)
register opcode_t * cur_opcode __asm__ ("esi") = cur_op;
register char * _reg_base __asm__ ("edi");
#else
opcode_t * cur_opcode = cur_op;
char * _reg_base;
#endif
SWITCH_RELOAD:
_reg_base = (char*)Parrot_pcc_get_regs_ni(interp, CURRENT_CONTEXT(interp))->regs_i;
do {
SWITCH_AGAIN:
Parrot_cx_handle_tasks(interp, interp->scheduler);
if (!cur_opcode)
break;
switch (*(opcode_t*)cur_opcode) {
END_C
}
=item C<run_core_split($base)>
If defined return code to split e.g. a switch.
=cut
sub run_core_split {
my ($self) = @_;
$self->{split_count}++;
return <<END_C;
default:
switch (*(opcode_t*)cur_opcode) {
END_C
}
=item C<run_core_finish($base)>
Returns the C code following the run core function.
=cut
sub run_core_finish {
my ( $self, $base ) = @_;
my $bs = $base . $self->suffix . '_';
my $c = <<END_C;
default:
if (*(opcode_t*)cur_opcode >= 0 &&
*(opcode_t*)cur_opcode < (opcode_t)${bs}op_lib.op_count) {
*(opcode_t*)cur_opcode = CORE_OPS_wrapper__;
continue;
}
Parrot_ex_throw_from_c_args(interp, NULL, 1,
"illegal opcode in switch core\\n");
break;
} /* switch */
END_C
for ( my $i = 0 ; $i < $self->{split_count} ; $i++ ) {
$c .= <<END_C;
} /* switch $i */
END_C
}
$c .= <<END_C;
} while (1);
return NULL;
}
END_C
$c .= " /* " . $self->core_prefix . "$base */\n\n";
return $c;
}
=back
=head1 SEE ALSO
=over 4
=item C<Parrot::OpTrans>
=item C<Parrot::OpTrans::C>
=item C<Parrot::OpTrans::CGP>
=item C<Parrot::OpTrans::CGoto>
=item C<Parrot::OpTrans::CPrederef>
=back
=cut
1;
# Local Variables:
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# End:
# vim: expandtab shiftwidth=4: