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Compiler.pir
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Compiler.pir
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=head1 NAME
PAST::Compiler - PAST Compiler
=head1 DESCRIPTION
PAST::Compiler implements a basic compiler for PAST nodes.
By default PAST::Compiler transforms a PAST tree into POST.
=head2 Signature Flags
Throughout the compiler PAST uses a number of 1-character
"flags" to indicate allowable register types and conversions.
This helps the compiler generate more efficient code and know
what sorts of conversions are allowed (or desired). The
basic flags are:
P,S,I,N PMC, string, int, or num register
Q keyed PMC, next flag indicates type of key
s string register or constant
i int register or constant
n num register or constant
r any register result
v void (no result)
* any result type except void
+ PMC, int register, num register, or numeric constant
~ PMC, string register, or string constant
: argument (same as '*'), possibly with :named or :flat
0-9 use the nth input operand as the output result of this operation
These flags are used to describe signatures and desired return
types for various operations. For example, if an opcode is
specified with a signature of C<I~P*>, then the opcode places
its result in an int register, its first child is coerced into
some sort of string value, its second child is coerced into a
PMC register, and the third and subsequent children can return
any value type.
=cut
.include "cclass.pasm"
.include "except_types.pasm"
.include "interpinfo.pasm"
.namespace [ 'PAST';'Compiler' ]
.sub 'onload' :anon :load :init
load_bytecode 'PCT/HLLCompiler.pbc'
.local pmc p6meta, cproto
p6meta = new 'P6metaclass'
cproto = p6meta.'new_class'('PAST::Compiler', 'parent'=>'PCT::HLLCompiler', 'attr'=>'%!symtable')
cproto.'language'('PAST')
$P1 = split ' ', 'post pir evalpmc'
cproto.'stages'($P1)
## %piropsig is a table of common opcode signatures
.local pmc piropsig
piropsig = new 'Hash'
piropsig['add'] = 'PP+'
piropsig['band'] = 'PPP'
piropsig['bxor'] = 'PPP'
piropsig['bnot'] = 'PP'
piropsig['bor'] = 'PPP'
piropsig['can'] = 'IPs'
piropsig['chr'] = 'Si'
piropsig['clone'] = 'PP'
piropsig['concat'] = 'PP~'
piropsig['copy'] = '0PP'
piropsig['defined'] = 'IP'
piropsig['delete'] = 'vQ*'
piropsig['die'] = 'v~'
piropsig['div'] = 'PP+'
piropsig['does'] = 'IPs'
piropsig['downcase'] = 'Ss'
piropsig['elements'] = 'IP'
piropsig['exists'] = 'IQ*'
piropsig['exit'] = 'vi'
piropsig['fdiv'] = 'PP+'
piropsig['find_codepoint'] = 'Is'
piropsig['find_dynamic_lex'] = 'Ps'
piropsig['find_name'] = 'Ps'
piropsig['getinterp'] = 'P'
piropsig['getprop'] = 'P~P'
piropsig['getstderr'] = 'P'
piropsig['getstdin'] = 'P'
piropsig['getstdout'] = 'P'
piropsig['index'] = 'Issi'
piropsig['isa'] = 'IP~'
piropsig['isfalse'] = 'IP'
piropsig['isnull'] = 'IP'
piropsig['issame'] = 'IPP'
piropsig['istrue'] = 'IP'
piropsig['join'] = 'SsP'
piropsig['length'] = 'Is'
piropsig['load_bytecode'] = 'vs'
piropsig['load_language'] = 'vs'
piropsig['loadlib'] = 'P~'
piropsig['mod'] = 'PP+'
piropsig['mul'] = 'PP+'
piropsig['neg'] = 'PP'
piropsig['new'] = 'P~'
piropsig['newclosure'] = 'PP'
piropsig['not'] = 'PP'
piropsig['ord'] = 'Isi'
piropsig['pop'] = 'PP'
piropsig['pow'] = 'NN+'
piropsig['print'] = 'v*'
piropsig['printerr'] = 'v*'
piropsig['push'] = '0P*'
piropsig['repeat'] = 'Ssi'
piropsig['replace'] = 'Ssiis'
piropsig['say'] = 'v*'
piropsig['set'] = 'PP'
piropsig['setprop'] = '0P~P'
piropsig['setattribute'] = '0P~P'
piropsig['shift'] = 'PP'
piropsig['shl'] = 'PP+'
piropsig['shr'] = 'PP+'
piropsig['sleep'] = 'v+'
piropsig['splice'] = '0PPii'
piropsig['split'] = 'Pss'
piropsig['sub'] = 'PP+'
piropsig['substr'] = 'Ssii'
piropsig['titlecase'] = 'Ss'
piropsig['trace'] = 'vi'
piropsig['typeof'] = 'SP'
piropsig['unshift'] = '0P*'
piropsig['upcase'] = 'Ss'
set_global '%piropsig', piropsig
## %valflags specifies when PAST::Val nodes are allowed to
## be used as a constant. The 'e' flag indicates that the
## value must be quoted+escaped in PIR code.
.local pmc valflags
valflags = new 'Hash'
valflags['String'] = 's~*:e'
valflags['Integer'] = 'i+*:'
valflags['Float'] = 'n+*:'
valflags['!cconst'] = 'i+*:c'
valflags['!except_severity'] = 'i+*:c'
valflags['!except_types'] = 'i+*:c'
valflags['!iterator'] = 'i+*:c'
valflags['!socket'] = 'i+*:c'
set_global '%valflags', valflags
## %!controltypes holds the list of exception types for each
## type of exception handler we support
.local pmc controltypes
controltypes = new 'Hash'
controltypes['CONTROL'] = '.CONTROL_RETURN, .CONTROL_OK, .CONTROL_BREAK, .CONTROL_CONTINUE, .CONTROL_TAKE, .CONTROL_LEAVE, .CONTROL_EXIT, .CONTROL_LOOP_NEXT, .CONTROL_LOOP_LAST, .CONTROL_LOOP_REDO'
controltypes['RETURN'] = '.CONTROL_RETURN'
controltypes['OK'] = '.CONTROL_OK'
controltypes['BREAK'] = '.CONTROL_BREAK'
controltypes['CONTINUE'] = '.CONTROL_CONTINUE'
controltypes['ERROR'] = '.CONTROL_ERROR'
controltypes['GATHER'] = '.CONTROL_TAKE'
controltypes['LEAVE'] = '.CONTROL_LEAVE'
controltypes['EXIT'] = '.CONTROL_EXIT'
controltypes['NEXT'] = '.CONTROL_NEXT'
controltypes['LAST'] = '.CONTROL_LAST'
controltypes['REDO'] = '.CONTROL_REDO'
set_global '%!controltypes', controltypes
$P0 = box 11
set_global '$!serno', $P0
.return ()
.end
=head2 Compiler methods
=over 4
=item to_post(node [, 'option'=>option, ...])
Compile the abstract syntax tree given by C<past> into POST.
=cut
.sub 'to_post' :method
.param pmc past
.param pmc options :slurpy :named
.local pmc symtable
symtable = new 'Hash'
setattribute self, '%!symtable', symtable
.local pmc blockpast
blockpast = get_global '@?BLOCK'
unless null blockpast goto have_blockpast
blockpast = new 'ResizablePMCArray'
set_global '@?BLOCK', blockpast
have_blockpast:
.lex '@*BLOCKPAST', blockpast
null $P99
.lex '$*SUB', $P99
$P1 = self.'as_post'(past, 'rtype'=>'v')
.return ($P1)
.end
=item escape(str)
Return C<str> as a PIR constant string.
=cut
.sub 'escape' :method
.param string str
.local string estr
estr = escape str
$I0 = index estr, "\\x"
if $I0 >= 0 goto unicode_prefix
$I0 = index estr, "\\u"
if $I0 >= 0 goto unicode_prefix
estr = concat '"', estr
goto done
unicode_prefix:
estr = concat 'unicode:"', estr
done:
estr = concat estr, '"'
.return (estr)
.end
=item unique([STR fmt])
Generate a unique number that can be used as an identifier.
If C<fmt> is provided, then it will be used as a prefix to the
unique number.
=cut
.sub 'unique' :method
.param string fmt :optional
.param int has_fmt :opt_flag
if has_fmt goto unique_1
fmt = ''
unique_1:
$P0 = get_global '$!serno'
$S0 = $P0
$S0 = concat fmt, $S0
inc $P0
.return ($S0)
.end
=item uniquereg(rtype)
Generate a unique register based on C<rtype>, where C<rtype>
is one of the signature flags described above.
=cut
.sub 'uniquereg' :method
.param string rtype
unless rtype goto err_nortype
if rtype == 'v' goto reg_void
.local string reg
reg = 'P'
$I0 = index 'Ss~Nn+Ii', rtype
if $I0 < 0 goto reg_psin
reg = substr 'SSSNNNII', $I0, 1
reg_psin:
reg = concat '$', reg
.tailcall self.'unique'(reg)
reg_void:
.return ('')
err_nortype:
self.'panic'('rtype not set')
.end
=item coerce(post, rtype)
Return a POST tree that coerces the result of C<post> to have a
return value compatible with C<rtype>. C<rtype> can also be
a specific register, in which case the result of C<post> is
forced into that register (with conversions as needed).
=cut
.sub 'coerce' :method
.param pmc post
.param string rtype
unless rtype goto err_nortype
.local string pmctype, result, rrtype
null pmctype
null result
## if rtype is a register, then set result and use the register
## type as rtype
$S0 = substr rtype, 0, 1
unless $S0 == '$' goto have_rtype
result = rtype
rtype = substr result, 1, 1
have_rtype:
## these rtypes allow any return value, so no coercion needed.
$I0 = index 'v*:', rtype
if $I0 >= 0 goto end
## figure out what type of result we already have
.local string source
source = post.'result'()
$S0 = substr source, 0, 1
if $S0 == '$' goto source_reg
if $S0 == '"' goto source_str
if $S0 == '.' goto source_int_or_num
if $S0 == '-' goto source_int_or_num
$I0 = is_cclass .CCLASS_NUMERIC, source, 0
if $I0 goto source_int_or_num
$S0 = substr source, 0, 8
if $S0 == 'unicode:' goto source_str
## assume that whatever is left acts like a PMC
goto source_pmc
source_reg:
## source is some sort of register
## if a register is all we need, we're done
if rtype == 'r' goto end
$S0 = substr source, 1, 1
## if we have the correct register type already, we're done
if $S0 != rtype goto source_reg_1
unless result goto end
goto coerce_reg
source_reg_1:
$S0 = downcase $S0
if $S0 == rtype goto end
## figure it out based on the register type
if $S0 == 's' goto source_str
if rtype == '+' goto end
if $S0 == 'i' goto source_int
if $S0 == 'n' goto source_num
source_pmc:
$I0 = index 'SINsin', rtype
if $I0 < 0 goto end
goto coerce_reg
source_str:
if rtype == '~' goto end
if rtype == 's' goto end
rrtype = 'S'
pmctype = "'String'"
goto coerce_reg
source_int_or_num:
if rtype == '+' goto end
## existence of an 'e' or '.' implies num
$I0 = index source, '.'
if $I0 >= 0 goto source_num
$I0 = index source, 'E'
if $I0 >= 0 goto source_num
source_int:
if rtype == 'i' goto end
rrtype = 'I'
pmctype = "'Integer'"
goto coerce_reg
source_num:
if rtype == 'n' goto end
rrtype = 'N'
pmctype = "'Float'"
coerce_reg:
## okay, we know we have to do a coercion.
## If we just need the value in a register (rtype == 'r'),
## then create result based on the preferred register type (rrtype).
if rtype != 'r' goto coerce_reg_1
result = self.'uniquereg'(rrtype)
coerce_reg_1:
## if we haven't set the result target yet, then generate one
## based on rtype. (The case of rtype == 'r' was handled above.)
if result goto coerce_reg_2
result = self.'uniquereg'(rtype)
coerce_reg_2:
## create a new ops node to hold the coercion, put C<post> in it.
$P0 = get_hll_global ['POST'], 'Ops'
post = $P0.'new'(post, 'result'=>result)
## if we need a new pmc (rtype == 'P' && pmctype defined), create it
if rtype != 'P' goto have_result
unless pmctype goto have_result
post.'push_pirop'('new', result, pmctype)
have_result:
## store the value into the target register
post.'push_pirop'('set', result, source)
end:
.return (post)
err_nortype:
self.'panic'('rtype not set')
.end
=item post_children(node [, 'signature'=>signature] )
Return the POST representation of evaluating all of C<node>'s
children in sequence. The C<signature> option is a string of
flags as described in "Signature Flags" above. Since we're
just evaluating children nodes, the first character of
C<signature> (return value type) is ignored. Thus a C<signature>
of C<v~P*> says that the first child needs to be something
in string context, the second child should be a PMC, and the
third and subsequent children can be any value they wish.
=cut
.sub 'post_children' :method
.param pmc node
.param pmc options :slurpy :named
.local pmc ops
$P0 = get_hll_global ['POST'], 'Ops'
ops = $P0.'new'('node'=>node)
## get any conversion types
.local string signature
signature = options['signature']
if signature goto have_signature
signature = '**'
have_signature:
.local int sigmax, sigidx
sigmax = length signature
dec sigmax
## if the signature contains a ':', then we're doing
## flagged arguments (:flat, :named)
.local pmc posargs, namedargs
posargs = new 'ResizableStringArray'
null namedargs
$I0 = index signature, ':'
if $I0 < 0 goto nocolon
namedargs = new 'ResizableStringArray'
nocolon:
.local pmc iter
.local string rtype
iter = node.'iterator'()
sigidx = 1
rtype = substr signature, sigidx, 1
iter_loop:
if rtype == 'Q' goto keyed_pos
unless iter goto iter_end
.local pmc cpast, cpost
cpast = shift iter
cpost = self.'as_post'(cpast, 'rtype'=>rtype)
cpost = self.'coerce'(cpost, rtype)
ops.'push'(cpost)
$I0 = isa cpast, ['PAST';'Node']
unless $I0 goto cpost_pos
.local pmc isflat
isflat = cpast.'flat'()
if rtype != ':' goto iter_pos
.local pmc npast, npost
npast = cpast.'named'()
unless npast goto iter_pos
$S0 = cpost
if isflat goto flat_named
npost = self.'as_post'(npast, 'rtype'=>'~')
$S1 = npost
ops.'push'(npost)
$S0 = concat $S0, ' :named('
$S0 = concat $S0, $S1
$S0 = concat $S0, ')'
goto named_done
flat_named:
$S0 = concat $S0, ' :named :flat'
named_done:
push namedargs, $S0
goto iter_rtype
iter_pos:
if isflat goto flat_pos
cpost_pos:
push posargs, cpost
goto iter_rtype
flat_pos:
$S0 = cpost
$S0 = concat $S0, ' :flat'
push posargs, $S0
iter_rtype:
unless sigidx < sigmax goto iter_loop
inc sigidx
rtype = substr signature, sigidx, 1
goto iter_loop
keyed_pos:
# rtype is 'Q', so construct a keyed pmc argument
# first, get the base PMC
unless iter goto iter_end
cpast = shift iter
cpost = self.'as_post'(cpast, 'rtype'=>'P')
cpost = self.'coerce'(cpost, 'P')
# now process the key arg
unless iter goto iter_end
.local pmc kpast, kpost
kpast = shift iter
inc sigidx
rtype = substr signature, sigidx, 1
kpost = self.'as_post'(kpast, 'rtype'=>rtype)
kpost = self.'coerce'(kpost, rtype)
ops.'push'(kpost)
ops.'push'(cpost)
# now construct the keyed PMC
$S0 = cpost
$S0 = concat $S0, '['
$S1 = kpost
$S0 = concat $S0, $S1
$S0 = concat $S0, ']'
push posargs, $S0
goto iter_rtype
iter_end:
.return (ops, posargs, namedargs)
.end
=back
=head2 Methods on C<PAST::Node> arguments
The methods below are used to transform PAST nodes into their
POST equivalents.
=head3 Defaults
=over 4
=item as_post(node) (General)
Return a POST representation of C<node>. Note that C<post> is
a multimethod based on the type of its first argument, this is
the method that is called when no other methods match.
=item as_post(Any)
This is the "fallback" method for any unrecognized node types.
We use this to throw a more useful exception in case any non-PAST
nodes make it into the tree.
=cut
.sub 'as_post' :method :multi(_, _)
.param pmc node
.param pmc options :slurpy :named
unless null node goto not_null_node
self.'panic'("PAST::Compiler can't compile a null node")
not_null_node:
$S0 = typeof node
self.'panic'("PAST::Compiler can't compile node of type ", $S0)
.end
=item as_post(Undef)
Return an empty POST node that can be used to hold a (PMC) result.
=cut
.sub 'as_post' :method :multi(_, Undef)
.param pmc node
.param pmc options :slurpy :named
.local string result
$P0 = get_hll_global ['POST'], 'Ops'
result = self.'uniquereg'('P')
.tailcall $P0.'new'('result'=>result)
.end
=item as_post(Integer)
=item as_post(Float)
=item as_post(String)
Handle Integer, Float, and String nodes in the PAST tree, by
generating a constant or an appropriate register setting.
=cut
.sub 'as_post' :method :multi(_, Integer)
.param pmc node
.param pmc options :slurpy :named
$P0 = get_hll_global ['POST'], 'Ops'
$P0 = $P0.'new'( 'result'=>node )
$S0 = options['rtype']
.tailcall self.'coerce'($P0, $S0)
.end
.sub 'as_post' :method :multi(_, Float)
.param pmc node
.param pmc options :slurpy :named
$P0 = get_hll_global ['POST'], 'Ops'
$P0 = $P0.'new'( 'result'=>node )
$S0 = options['rtype']
.tailcall self.'coerce'($P0, $S0)
.end
.sub 'as_post' :method :multi(_, String)
.param pmc node
.param pmc options :slurpy :named
.local string value
value = self.'escape'(node)
$P0 = get_hll_global ['POST'], 'Ops'
$P0 = $P0.'new'( 'result'=>value )
$S0 = options['rtype']
.tailcall self.'coerce'($P0, $S0)
.end
=item as_vivipost(String class)
Generate POST to create a new object of type C<class>. This
is typically invoked by the various vivification methods below
(e.g., in a PAST::Var node to default a variable to a given type).
=cut
.sub 'as_vivipost' :method :multi(_, String)
.param pmc node
.param pmc options :slurpy :named
.local string result
$P0 = get_hll_global ['POST'], 'Op'
result = self.'uniquereg'('P')
$S0 = self.'escape'(node)
.tailcall $P0.'new'(result, $S0, 'pirop'=>'new', 'result'=>result)
.end
=item as_vivipost(PAST::Node node)
=cut
.sub 'as_vivipost' :method :multi(_, _)
.param pmc node
.param pmc options :slurpy :named
.tailcall self.'as_post'(node, options :flat :named)
.end
=item as_post(PAST::Node node)
Return the POST representation of executing C<node>'s children in
sequence. The result of the final child is used as the result
of this node.
N.B.: This method is also the one that is invoked for converting
nodes of type C<PAST::Stmts>.
=cut
.sub 'as_post' :method :multi(_, ['PAST';'Node']) :subid('Node.as_post')
.param pmc node
.param pmc options :slurpy :named
.local pmc ops
.local string rtype
rtype = options['rtype']
$P0 = node.'list'()
$I0 = elements $P0
$S0 = repeat 'v', $I0
$S0 = concat $S0, rtype
ops = self.'post_children'(node, 'signature'=>$S0)
$P0 = ops[-1]
ops.'result'($P0)
.local pmc eh
eh = node.'handlers'()
unless eh, no_eh
ops = self.'wrap_handlers'(ops, eh, 'rtype'=>rtype)
no_eh:
.return (ops)
.end
=back
=head3 C<PAST::Control>
=over 4
=item as_post(PAST::Control node)
Return the POST representation of a C<PAST::Control>.
=cut
.sub 'as_post' :method :multi(_, ['PAST';'Control'])
.param pmc node
.param pmc options :slurpy :named
.local pmc ops, children, ishandled, nothandled
.local string handled
$P0 = get_hll_global ['POST'], 'Label'
$S0 = self.'unique'('handled_')
ishandled = $P0.'new'('result'=>$S0)
$S0 = self.'unique'('nothandled_')
nothandled = $P0.'new'('result'=>$S0)
$P0 = get_hll_global ['POST'], 'Ops'
ops = $P0.'new'('node'=>node)
.local string rtype
rtype = options['rtype']
$P0 = node.'list'()
$I0 = elements $P0
$S0 = repeat 'v', $I0
$S0 = concat $S0, rtype
ops.'push_pirop'('.local pmc exception')
ops.'push_pirop'('.get_results (exception)')
children = self.'post_children'(node, 'signature'=>$S0)
ops.'push'(children)
handled = self.'uniquereg'('I')
ops.'push_pirop'('set', handled, 'exception["handled"]')
ops.'push_pirop'('ne', handled, 1, nothandled)
ops.'push'(ishandled)
ops.'push_pirop'('return', 'exception')
ops.'push'(nothandled)
ops.'push_pirop'('rethrow', 'exception')
.return (ops)
.end
.sub 'wrap_handlers' :method
.param pmc child
.param pmc ehs
.param pmc options :slurpy :named
.local string rtype
rtype = options['rtype']
.local pmc it, node, ops, pops, tail, skip
$P0 = get_hll_global ['POST'], 'Ops'
ops = $P0.'new'('node'=>node)
$P0 = get_hll_global ['POST'], 'Ops'
pops = $P0.'new'('node'=>node)
$P0 = get_hll_global ['POST'], 'Ops'
tail = $P0.'new'('node'=>node)
$P0 = get_hll_global ['POST'], 'Label'
$S0 = self.'unique'('skip_handler_')
skip = $P0.'new'('result'=>$S0)
it = iter ehs
handler_loop:
unless it, handler_loop_done
node = shift it
.local pmc ehpir, label, controltypes, subpost
.local string ehreg, type
$P0 = get_hll_global ['POST'], 'Label'
$S0 = self.'unique'('control_')
label = $P0.'new'('result'=>$S0)
subpost = find_dynamic_lex '$*SUB'
ehreg = self.'uniquereg'('P')
ops.'push_pirop'('new', ehreg, "'ExceptionHandler'")
ops.'push_pirop'('set_addr', ehreg, label)
controltypes = get_global '%!controltypes'
type = node.'handle_types'()
unless type, handle_types_done
type = controltypes[type]
unless type, handle_types_done
$P0 = split ',', type
ops.'push_pirop'('callmethod', '"handle_types"', ehreg, $P0 :flat)
subpost.'add_directive'('.include "except_types.pasm"')
handle_types_done:
type = node.'handle_types_except'()
unless type, handle_types_except_done
type = controltypes[type]
unless type, handle_types_except_done
$P0 = split ',', type
ops.'push_pirop'('callmethod', '"handle_types_except"', ehreg, $P0 :flat)
subpost.'add_directive'('.include "except_types.pasm"')
handle_types_except_done:
ops.'push_pirop'('push_eh', ehreg)
# Add one pop_eh for every handler we push_eh
pops.'push_pirop'('pop_eh')
# Push the handler itself
tail.'push'(label)
ehpir = self.'as_post'(node, 'rtype'=>rtype)
tail.'push'(ehpir)
goto handler_loop
handler_loop_done:
ops.'push'(child)
ops.'push'(pops)
ops.'push_pirop'('goto', skip)
ops.'push'(tail)
ops.'push'(skip)
.return (ops)
.end
=back
=head3 C<PAST::Block>
=over 4
=item as_post(PAST::Block node)
Return the POST representation of a C<PAST::Block>.
=cut
.sub 'as_post' :method :multi(_, ['PAST';'Block'])
.param pmc node
.param pmc options :slurpy :named
## add current block node to @*BLOCKPAST
.local pmc blockpast
blockpast = find_dynamic_lex '@*BLOCKPAST'
unshift blockpast, node
.local string name, pirflags, blocktype
.local pmc nsentry, subid, ns, hll, multi, loadlibs
name = node.'name'()
pirflags = node.'pirflags'()
blocktype = node.'blocktype'()
nsentry = node.'nsentry'()
subid = node.'subid'()
ns = node.'namespace'()
hll = node.'hll'()
multi = node.'multi'()
loadlibs = node.'loadlibs'()
## handle nsentry attribute
$I0 = defined nsentry
unless $I0 goto nsentry_done
unless nsentry goto nsentry_anon
$S0 = self.'escape'(nsentry)
pirflags = concat pirflags, ' :nsentry('
pirflags = concat pirflags, $S0
pirflags = concat pirflags, ')'
goto nsentry_done
nsentry_anon:
pirflags = concat pirflags, ' :anon'
nsentry_done:
## handle anonymous blocks
if name goto have_name
name = self.'unique'('_block')
if ns goto have_name
if nsentry goto have_name
pirflags = concat pirflags, ' :anon'
have_name:
## create a POST::Sub node for this block
.local pmc bpost
$P0 = get_hll_global ['POST'], 'Sub'
bpost = $P0.'new'('node'=>node, 'name'=>name, 'blocktype'=>blocktype, 'namespace'=>ns, 'hll'=>hll, 'subid'=>subid, 'multi'=>multi, 'loadlibs'=>loadlibs)
unless pirflags goto pirflags_done
bpost.'pirflags'(pirflags)
pirflags_done:
## pir-encode name and namespace
.local string blockreg, blockref
blockreg = self.'uniquereg'('P')
if ns goto block_ns
blockref = concat ".const 'Sub' ", blockreg
blockref = concat blockref, ' = '
$P0 = bpost.'subid'()
$S0 = self.'escape'($P0)
blockref = concat blockref, $S0
goto have_blockref
block_ns:
$P0 = get_hll_global ['POST'], 'Compiler'
blockref = concat 'get_hll_global ', blockreg
$S0 = $P0.'key_pir'(ns)
blockref = concat blockref, ', '
blockref = concat blockref, $S0
$S0 = self.'escape'(name)
blockref = concat blockref, ', '
blockref = concat blockref, $S0
have_blockref:
## determine the outer POST::Sub for the new one
.local pmc outerpost
outerpost = find_dynamic_lex '$*SUB'
.lex '$*SUB', bpost
.local int islexical
islexical = node.'lexical'()
unless islexical goto outer_done
bpost.'outer'(outerpost)
## add block setup code (cpost) to outer block if needed
if null outerpost goto outer_done
.local pmc cpost
$P0 = get_hll_global ['POST'], 'Ops'
cpost = $P0.'new'( 'result'=>blockreg )
cpost.'push_pirop'(blockref)
cpost.'push_pirop'('capture_lex', blockreg)
outerpost.'unshift'(cpost)
outer_done:
## merge the node's symtable with the master
.local pmc outersym, symtable
outersym = getattribute self, '%!symtable'
symtable = outersym
## if the Block doesn't have a symtable, re-use the existing one
$P0 = node.'symtable'()
unless $P0 goto have_symtable
## if the Block has a default ('') entry, use the Block's symtable as-is
symtable = $P0
$I0 = defined symtable['']
if $I0 goto have_symtable
## merge the Block's symtable with outersym
symtable = clone symtable
symtable_merge:
.local pmc it
it = iter outersym
symtable_merge_loop:
unless it goto have_symtable
$S0 = shift it
$I0 = exists symtable[$S0]
if $I0 goto symtable_merge_loop
$P0 = it[$S0]
symtable[$S0] = $P0
goto symtable_merge_loop
have_symtable:
setattribute self, '%!symtable', symtable
.local pmc compiler
compiler = node.'compiler'()
if compiler goto children_compiler
## control exception handler
.local pmc ctrlpast, ctrllabel
ctrlpast = node.'control'()
unless ctrlpast goto children_past
$P0 = get_hll_global ['POST'], 'Label'
$S0 = self.'unique'('control_')
ctrllabel = $P0.'new'('result'=>$S0)
$S0 = self.'uniquereg'('P')
bpost.'push_pirop'('new', $S0, "['ExceptionHandler']", '.CONTROL_RETURN')
bpost.'push_pirop'('set_addr', $S0, ctrllabel)
bpost.'push_pirop'('push_eh', $S0)
bpost.'add_directive'('.include "except_types.pasm"')
children_past:
## all children but last are void context, last returns anything
$P0 = node.'list'()
$I0 = elements $P0
$S0 = repeat 'v', $I0
$S0 = concat $S0, '*'
## convert children to post
.local pmc ops, retval
ops = self.'post_children'(node, 'signature'=>$S0)
## wrap the child with appropriate exception handlers, if any
.local pmc eh
eh = node.'handlers'()
unless eh, no_eh
$S0 = options['rtype']
retval = ops[-1]
ops = self.'wrap_handlers'(ops, eh, 'rtype'=>$S0)
goto had_eh
no_eh:
## result of last child is return from block
retval = ops[-1]
had_eh:
bpost.'push'(ops)
bpost.'push_pirop'('return', retval)
unless ctrlpast goto sub_done
bpost.'push'(ctrllabel)
bpost.'push_pirop'('.local pmc exception')
bpost.'push_pirop'('.get_results (exception)')
$I0 = isa ctrlpast, ['PAST';'Node']
if $I0 goto control_past
if ctrlpast == 'return_pir' goto control_return
self.'panic'("Unrecognized control handler '", ctrlpast, "'")
control_return:
## handle 'return' exceptions
$S0 = self.'uniquereg'('P')
bpost.'push_pirop'('getattribute', $S0, 'exception', '"payload"')
bpost.'push_pirop'('return', $S0)
goto sub_done
control_past:
$P0 = self.'as_post'(ctrlpast, 'rtype'=>'*')
bpost.'push'($P0)
goto sub_done
children_compiler:
## set the compiler to use for the POST::Sub node, pass on
## and compiler arguments and add this block's child to it.
bpost.'compiler'(compiler)
$P0 = node.'compiler_args'()
bpost.'compiler_args'($P0)
$P0 = node[0]
bpost.'push'($P0)
sub_done:
## generate any loadinit code for the sub
$I0 = exists node['loadinit']
unless $I0 goto loadinit_done
.local pmc lisub
$P0 = get_hll_global ['POST'], 'Sub'
lisub = $P0.'new'('outer'=>bpost, 'pirflags'=>':load :init')
lisub.'push_pirop'(blockref)
lisub.'push_pirop'('.local pmc', 'block')
lisub.'push_pirop'('set', 'block', blockreg)