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hll.c
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hll.c
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/*
Copyright (C) 2005-2008, The Perl Foundation.
$Id$
=head1 NAME
src/hll.c - High Level Language support
=head1 DESCRIPTION
The Parrot core sometimes has to create new PMCs which should map to the
current HLL's defaults. The current language and a typemap provides this
feature.
=head1 DATA
interp->HLL_info
@HLL_info = [
[ hll_name, hll_lib, { core_type => HLL_type, ... }, namespace, hll_id ],
...
]
=head2 Functions
=over 4
=cut
*/
#include "parrot/parrot.h"
#include "parrot/dynext.h"
#include "hll.str"
/* HEADERIZER HFILE: include/parrot/hll.h */
/* HEADERIZER BEGIN: static */
/* Don't modify between HEADERIZER BEGIN / HEADERIZER END. Your changes will be lost. */
PARROT_CANNOT_RETURN_NULL
PARROT_WARN_UNUSED_RESULT
static PMC* new_hll_entry(PARROT_INTERP, ARGIN_NULLOK(STRING *entry_name))
__attribute__nonnull__(1);
/* Don't modify between HEADERIZER BEGIN / HEADERIZER END. Your changes will be lost. */
/* HEADERIZER END: static */
/* for shared HLL data, do COW stuff */
#define START_READ_HLL_INFO(interp, hll_info)
#define END_READ_HLL_INFO(interp, hll_info)
#define START_WRITE_HLL_INFO(interp, hll_info) \
do { \
if (PMC_sync((interp)->HLL_info)) { \
(hll_info) = (interp)->HLL_info = \
Parrot_clone((interp), (interp)->HLL_info); \
if (PMC_sync((interp)->HLL_info)) \
mem_internal_free(PMC_sync((interp)->HLL_info)); \
} \
} while (0)
#define END_WRITE_HLL_INFO(interp, hll_info)
/*
=item C<static PMC* new_hll_entry>
Create a new HLL information table entry.
Takes an interpreter name and (optional) entry name.
Returns a pointer to the new entry.
Used by Parrot_register_HLL and Parrot_register_HLL_lib.
=cut
*/
PARROT_CANNOT_RETURN_NULL
PARROT_WARN_UNUSED_RESULT
static PMC*
new_hll_entry(PARROT_INTERP, ARGIN_NULLOK(STRING *entry_name))
{
PMC * const hll_info = interp->HLL_info;
const INTVAL id = VTABLE_elements(interp, hll_info);
PMC *entry_id;
/*
* ATT: all items that are owned by the HLL_info structure
* have to be created as constant objects, because
* this structure isn't marked by DOD/GC
*/
PMC * const entry = constant_pmc_new(interp, enum_class_FixedPMCArray);
if (entry_name && !STRING_IS_EMPTY(entry_name)) {
char *cstring = string_to_cstring(interp, entry_name);
UINTVAL len = string_length(interp, entry_name);
STRING *const_name = string_make_direct(interp, cstring,
len, PARROT_DEFAULT_ENCODING, PARROT_DEFAULT_CHARSET,
PObj_constant_FLAG);
string_cstring_free(cstring);
VTABLE_set_pmc_keyed_str(interp, hll_info, const_name, entry);
}
else
VTABLE_push_pmc(interp, hll_info, entry);
VTABLE_set_integer_native(interp, entry, e_HLL_MAX);
entry_id = constant_pmc_new(interp, enum_class_Integer);
VTABLE_set_integer_native(interp, entry_id, id);
VTABLE_set_pmc_keyed_int(interp, entry, e_HLL_id, entry_id);
return entry;
}
/*
=item C<void Parrot_init_HLL>
Initialises the HLL_info and HLL_namespace fields. Takes an interpreter and
calls C<Parrot_register_HLL> to register name within Parrot core.
=cut
*/
void
Parrot_init_HLL(PARROT_INTERP)
{
interp->HLL_info =
constant_pmc_new(interp, enum_class_OrderedHash);
interp->HLL_namespace =
constant_pmc_new(interp, enum_class_ResizablePMCArray);
Parrot_register_HLL(interp, CONST_STRING(interp, "parrot"));
}
/*
=item C<INTVAL Parrot_register_HLL>
Register HLL C<hll_name> within Parrot core. If C<hll_lib> isn't a NULL
STRING, load the shared language support library. Creates a root namespace for
the HLL named C<hll_name>. Returns a type ID for this HLL or 0 on error.
If C<hll_name> is NULL, only the library is loaded. The C<.loadlib> pragma
uses this.
=cut
*/
PARROT_EXPORT
INTVAL
Parrot_register_HLL(PARROT_INTERP, ARGIN(STRING *hll_name))
{
PMC *entry, *name, *type_hash, *ns_hash, *hll_info;
INTVAL idx;
/* TODO LOCK or disallow in threads */
idx = Parrot_get_HLL_id(interp, hll_name);
if (idx >= 0)
return idx;
hll_info = interp->HLL_info;
START_WRITE_HLL_INFO(interp, hll_info);
idx = VTABLE_elements(interp, hll_info);
entry = new_hll_entry(interp, hll_name);
/* register HLL name */
name = constant_pmc_new_noinit(interp, enum_class_String);
VTABLE_set_string_native(interp, name, hll_name);
VTABLE_set_pmc_keyed_int(interp, entry, e_HLL_name, name);
/* create HLL namespace using the *constant* name */
hll_name = string_downcase(interp, VTABLE_get_string(interp, name));
/* HLL type mappings aren't yet created, we can't create
* a namespace in HLL's flavor yet - maybe promote the
* ns_hash to another type, if mappings provide one
* XXX - FIXME
*/
ns_hash = Parrot_make_namespace_keyed_str(interp, interp->root_namespace,
hll_name);
/* cache HLL's toplevel namespace */
VTABLE_set_pmc_keyed_int(interp, interp->HLL_namespace, idx, ns_hash);
/* create HLL typemap hash */
type_hash = Parrot_new_INTVAL_hash(interp, PObj_constant_FLAG);
VTABLE_set_pmc_keyed_int(interp, entry, e_HLL_typemap, type_hash);
/* UNLOCK */
END_WRITE_HLL_INFO(interp, hll_info);
return idx;
}
/*
=item C<INTVAL Parrot_register_HLL_lib>
Register an HLL library.
Takes an interpreter name and a pointer to a library name.
If the name matches one already registered, return the list position.
Otherwise, add the entry to the list and return 0.
=cut
*/
PARROT_EXPORT
INTVAL
Parrot_register_HLL_lib(PARROT_INTERP, ARGIN(STRING *hll_lib))
{
PMC *hll_info = interp->HLL_info;
PMC *entry, *name;
INTVAL nelements, i;
START_WRITE_HLL_INFO(interp, hll_info);
nelements = VTABLE_elements(interp, hll_info);
for (i = 0; i < nelements; ++i) {
PMC * const entry = VTABLE_get_pmc_keyed_int(interp, hll_info, i);
PMC * const lib_name = VTABLE_get_pmc_keyed_int(interp, entry, e_HLL_lib);
if (!PMC_IS_NULL(lib_name)) {
const STRING * const name = VTABLE_get_string(interp, lib_name);
if (string_equal(interp, name, hll_lib) == 0)
break;
}
}
if (i < nelements)
return i;
entry = new_hll_entry(interp, NULL);
VTABLE_set_pmc_keyed_int(interp, entry, e_HLL_name, PMCNULL);
/* register dynlib */
name = constant_pmc_new_noinit(interp, enum_class_String);
VTABLE_set_string_native(interp, name, hll_lib);
VTABLE_set_pmc_keyed_int(interp, entry, e_HLL_lib, name);
END_WRITE_HLL_INFO(interp, hll_info);
return 0;
}
/*
=item C<INTVAL Parrot_get_HLL_id>
Return the ID of the given HLL name or -1 on error. C<parrot> has ID 0.
=cut
*/
PARROT_EXPORT
PARROT_WARN_UNUSED_RESULT
INTVAL
Parrot_get_HLL_id(PARROT_INTERP, ARGIN_NULLOK(STRING *hll_name))
{
PMC * const hll_info = interp->HLL_info;
INTVAL i;
START_READ_HLL_INFO(interp, hll_info);
if (!hll_name || !VTABLE_exists_keyed_str(interp, hll_info, hll_name))
i = -1;
else {
PMC * const entry = VTABLE_get_pmc_keyed_str(interp, hll_info, hll_name);
PMC * const entry_id = VTABLE_get_pmc_keyed_int(interp, entry, e_HLL_id);
i = VTABLE_get_integer(interp, entry_id);
}
END_READ_HLL_INFO(interp, hll_info);
return i;
}
/*
=item C<STRING * Parrot_get_HLL_name>
Returns the corresponding PMC's name.
Takes an interpreter name and an id.
If the id is out of range, or the PMC name is NULL,
returns NULL.
=cut
*/
PARROT_EXPORT
PARROT_WARN_UNUSED_RESULT
PARROT_CAN_RETURN_NULL
STRING *
Parrot_get_HLL_name(PARROT_INTERP, INTVAL id)
{
PMC * const hll_info = interp->HLL_info;
const INTVAL nelements = VTABLE_elements(interp, hll_info);
PMC *entry, *name_pmc;
if (id < 0 || id >= nelements)
return NULL;
START_READ_HLL_INFO(interp, hll_info);
entry = VTABLE_get_pmc_keyed_int(interp, hll_info, id);
name_pmc = VTABLE_get_pmc_keyed_int(interp, entry, e_HLL_name);
END_READ_HLL_INFO(interp, hll_info);
/* loadlib-created 'HLL's are nameless */
if (PMC_IS_NULL(name_pmc))
return NULL;
else
return VTABLE_get_string(interp, name_pmc);
}
/*
=item C<void Parrot_register_HLL_type>
Register a type mapping of C<< core_type => hll_type >> for the given HLL.
=cut
*/
PARROT_EXPORT
void
Parrot_register_HLL_type(PARROT_INTERP, INTVAL hll_id,
INTVAL core_type, INTVAL hll_type)
{
PMC *entry, *type_hash, *instantiated;
Hash *hash;
PMC *hll_info = interp->HLL_info;
const INTVAL n = VTABLE_elements(interp, hll_info);
if (hll_id >= n)
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_GLOBAL_NOT_FOUND,
"no such HLL ID (%vd)", hll_id);
/* the type might already be registered in a non-conflicting way, in which
* case we can avoid copying */
if (PMC_sync(hll_info)) {
if (hll_type == Parrot_get_HLL_type(interp, hll_id, core_type))
return;
}
START_WRITE_HLL_INFO(interp, hll_info);
entry = VTABLE_get_pmc_keyed_int(interp, hll_info, hll_id);
PARROT_ASSERT(!PMC_IS_NULL(entry));
type_hash = VTABLE_get_pmc_keyed_int(interp, entry, e_HLL_typemap);
PARROT_ASSERT(!PMC_IS_NULL(type_hash));
VTABLE_set_integer_keyed_int(interp, type_hash, core_type, hll_type);
END_WRITE_HLL_INFO(interp, hll_info);
}
/*
=item C<INTVAL Parrot_get_HLL_type>
Get an equivalent HLL type number for the language C<hll_id>. If the given HLL
doesn't remap the given type, or if C<hll_id> is the special value
C<PARROT_HLL_NONE>, returns C<core_type> unchanged.
=cut
*/
PARROT_EXPORT
INTVAL
Parrot_get_HLL_type(PARROT_INTERP, INTVAL hll_id, INTVAL core_type)
{
PMC *entry, *type_hash, *hll_info;
INTVAL n, id;
if (hll_id == PARROT_HLL_NONE || hll_id == 0)
return core_type;
if (hll_id < 0)
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_GLOBAL_NOT_FOUND,
"no such HLL ID (%vd)", hll_id);
hll_info = interp->HLL_info;
n = VTABLE_elements(interp, hll_info);
if (hll_id >= n)
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_GLOBAL_NOT_FOUND,
"no such HLL ID (%vd)", hll_id);
START_READ_HLL_INFO(interp, hll_info);
entry = VTABLE_get_pmc_keyed_int(interp, hll_info, hll_id);
END_READ_HLL_INFO(interp, hll_info);
type_hash = VTABLE_get_pmc_keyed_int(interp, entry, e_HLL_typemap);
if (PMC_IS_NULL(type_hash))
return core_type;
id = VTABLE_get_integer_keyed_int(interp, type_hash, core_type);
return id ? id : core_type;
}
/*
=item C<INTVAL Parrot_get_ctx_HLL_type>
Return an equivalent PMC type number according to the current HLL setings in
the context. If no type is registered, returns C<core_type>.
=cut
*/
PARROT_EXPORT
INTVAL
Parrot_get_ctx_HLL_type(PARROT_INTERP, INTVAL core_type)
{
const INTVAL hll_id = CONTEXT(interp)->current_HLL;
return Parrot_get_HLL_type(interp, hll_id, core_type);
}
/*
=item C<PMC* Parrot_get_ctx_HLL_namespace>
Return root namespace of the current HLL.
=cut
*/
PARROT_EXPORT
PARROT_WARN_UNUSED_RESULT
PARROT_CAN_RETURN_NULL
PMC*
Parrot_get_ctx_HLL_namespace(PARROT_INTERP)
{
return Parrot_get_HLL_namespace(interp, CONTEXT(interp)->current_HLL);
}
/*
=item C<PMC* Parrot_get_HLL_namespace>
Return root namespace of the HLL with the ID of I<hll_id>. If C<hll_id> is the
special value C<PARROT_HLL_NONE>, return the global root namespace.
=cut
*/
PARROT_EXPORT
PARROT_WARN_UNUSED_RESULT
PARROT_CAN_RETURN_NULL
PMC*
Parrot_get_HLL_namespace(PARROT_INTERP, int hll_id)
{
if (hll_id == PARROT_HLL_NONE)
return interp->root_namespace;
if (PMC_int_val(interp->HLL_namespace) < hll_id)
return PMCNULL;
return VTABLE_get_pmc_keyed_int(interp, interp->HLL_namespace, hll_id);
}
/*
=item C<void Parrot_regenerate_HLL_namespaces>
Create all HLL namespaces that don't already exist. This is necessary when
creating a new interpreter which shares an old interpreter's HLL_info.
=cut
*/
PARROT_EXPORT
void
Parrot_regenerate_HLL_namespaces(PARROT_INTERP)
{
const INTVAL n = VTABLE_elements(interp, interp->HLL_info);
INTVAL hll_id;
/* start at one since the 'parrot' namespace should already have been
* created */
for (hll_id = 1; hll_id < n; ++hll_id) {
PMC *ns_hash =
VTABLE_get_pmc_keyed_int(interp, interp->HLL_namespace, hll_id);
if (PMC_IS_NULL(ns_hash) ||
ns_hash->vtable->base_type == enum_class_Undef)
{
STRING * const hll_name = Parrot_get_HLL_name(interp, hll_id);
if (!hll_name)
continue;
string_downcase_inplace(interp, hll_name);
/* XXX as in Parrot_register_HLL() this needs to be fixed to use
* the correct type of namespace. It's relatively easy to do that
* here because the typemap already exists, but it is not currently
* done for consistency.
*/
ns_hash = Parrot_make_namespace_keyed_str(interp,
interp->root_namespace, hll_name);
VTABLE_set_pmc_keyed_int(interp, interp->HLL_namespace,
hll_id, ns_hash);
}
}
}
/*
=back
=head1 AUTHOR
Leopold Toetsch
=cut
*/
/*
* Local variables:
* c-file-style: "parrot"
* End:
* vim: expandtab shiftwidth=4:
*/