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signatures.c
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signatures.c
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/*
Copyright (C) 2010-2011, Parrot Foundation.
=head1 NAME
src/nci/signatures.c - Native Call Interface signature processing routines
=head1 DESCRIPTION
This file implements functionality for parsing NCI signatures and generating PCC
signatures.
=head2 Functions
=over 4
=cut
*/
#include "parrot/parrot.h"
#include "parrot/nci.h"
#include "signatures.str"
/* HEADERIZER HFILE: include/parrot/nci.h */
/* HEADERIZER BEGIN: static */
/* Don't modify between HEADERIZER BEGIN / HEADERIZER END. Your changes will be lost. */
static char ncidt_to_pcc(PARROT_INTERP, PARROT_DATA_TYPE t)
__attribute__nonnull__(1);
#define ASSERT_ARGS_ncidt_to_pcc __attribute__unused__ int _ASSERT_ARGS_CHECK = (\
PARROT_ASSERT_ARG(interp))
/* Don't modify between HEADERIZER BEGIN / HEADERIZER END. Your changes will be lost. */
/* HEADERIZER END: static */
/*
=item C<PMC * Parrot_nci_parse_signature(PARROT_INTERP, STRING *sig_str)>
Parse a signature string to a NCI signature PMC.
=cut
*/
PARROT_CANNOT_RETURN_NULL
PARROT_EXPORT
PMC *
Parrot_nci_parse_signature(PARROT_INTERP, ARGIN(STRING *sig_str))
{
ASSERT_ARGS(Parrot_nci_parse_signature)
const size_t sig_length = Parrot_str_byte_length(interp, sig_str);
PMC *sig_pmc = Parrot_pmc_new_init_int(interp, enum_class_FixedIntegerArray,
sig_length);
size_t i;
if (!sig_length) {
sig_pmc = Parrot_pmc_new_init_int(interp, enum_class_FixedIntegerArray, 1);
VTABLE_set_integer_keyed_int(interp, sig_pmc, 0, enum_type_void);
return sig_pmc;
}
for (i = 0; i < sig_length; ++i) {
const INTVAL c = Parrot_str_indexed(interp, sig_str, i);
PARROT_DATA_TYPE e;
PARROT_ASSERT(c == (char)c);
switch ((char)c) {
case 'f':
e = enum_type_float;
break;
case 'd':
e = enum_type_double;
break;
case 'N':
e = enum_type_FLOATVAL;
break;
case 'c': /* char */
e = enum_type_char;
break;
case 's': /* short */
e = enum_type_short;
break;
case 'i': /* int */
e = enum_type_int;
break;
case 'l': /* long */
e = enum_type_long;
break;
case 'I': /* INTVAL */
e = enum_type_INTVAL;
break;
case 'S':
e = enum_type_STRING;
break;
case 'p': /* push pmc->data */
e = enum_type_ptr;
break;
case 'O': /* PMC invocant */
case 'P': /* push PMC * */
e = enum_type_PMC;
break;
case 'v':
e = enum_type_void;
break;
default:
Parrot_ex_throw_from_c_args(interp, NULL,
EXCEPTION_JIT_ERROR,
"Unknown param Signature %c\n", (char)c);
break;
}
VTABLE_set_integer_keyed_int(interp, sig_pmc, i, e);
}
return sig_pmc;
}
/*
=item C<static char ncidt_to_pcc(PARROT_INTERP, PARROT_DATA_TYPE t)>
Lookup the appropriate PCC signature item to use for a given NCI type.
=cut
*/
static char
ncidt_to_pcc(PARROT_INTERP, PARROT_DATA_TYPE t)
{
ASSERT_ARGS(ncidt_to_pcc)
switch (t) {
case enum_type_float:
case enum_type_double:
case enum_type_FLOATVAL:
return 'N';
case enum_type_char:
case enum_type_short:
case enum_type_int:
case enum_type_long:
case enum_type_INTVAL:
return 'I';
case enum_type_STRING:
return 'S';
case enum_type_ptr:
case enum_type_PMC:
return 'P';
case enum_type_void:
return 'v';
default:
Parrot_ex_throw_from_c_args(interp, NULL, 0, "Unhandled NCI type: `%Ss'",
Parrot_dt_get_datatype_name(interp, t));
}
}
/*
=item C<void Parrot_nci_sig_to_pcc(PARROT_INTERP, PMC *sig_pmc, STRING
**params_sig, STRING **ret_sig)>
Determine the PCC signatures for a given NCI signature PMC.
=cut
*/
void
Parrot_nci_sig_to_pcc(PARROT_INTERP, ARGIN(PMC *sig_pmc), ARGOUT(STRING **params_sig),
ARGOUT(STRING **ret_sig))
{
ASSERT_ARGS(Parrot_nci_sig_to_pcc)
const size_t sig_len = VTABLE_elements(interp, sig_pmc);
const size_t argc = sig_len - 1;
size_t retc = 0;
/* avoid malloc churn on common signatures */
char static_buf[16];
char *sig_buf;
size_t i, j;
PARROT_DATA_TYPE t;
/* process NCI arguments */
sig_buf = argc < sizeof static_buf ? static_buf : (char *)mem_sys_allocate(argc);
for (i = 0; i < argc; i++) {
t = (PARROT_DATA_TYPE)VTABLE_get_integer_keyed_int(interp, sig_pmc, i + 1);
sig_buf[i] = ncidt_to_pcc(interp, (PARROT_DATA_TYPE)(t & ~enum_type_ref_flag));
if (t & enum_type_ref_flag)
retc++;
}
*params_sig = argc ? Parrot_str_new(interp, sig_buf, argc) : CONST_STRING(interp, "");
if (sig_buf != static_buf)
mem_sys_free(sig_buf);
if (enum_type_void !=
(t = (PARROT_DATA_TYPE)VTABLE_get_integer_keyed_int(interp, sig_pmc, 0)))
retc++;
/* process NCI returns */
sig_buf = retc < sizeof static_buf ? static_buf : (char *)mem_sys_allocate(retc);
if (enum_type_void == t) {
j = 0;
}
else {
sig_buf[0] = ncidt_to_pcc(interp, t);
j = 1;
}
for (i = 0; j < retc; i++) {
t = (PARROT_DATA_TYPE)VTABLE_get_integer_keyed_int(interp, sig_pmc, i + 1);
if (t & enum_type_ref_flag)
sig_buf[j++] = ncidt_to_pcc(interp, (PARROT_DATA_TYPE)(t & ~enum_type_ref_flag));
}
*ret_sig = retc ? Parrot_str_new(interp, sig_buf, retc) : CONST_STRING(interp, "");
if (sig_buf != static_buf)
mem_sys_free(sig_buf);
}
/*
=item C<STRING * Parrot_nci_describe_sig(PARROT_INTERP, PMC *sig)>
Provide a descriptive string for a signature.
=cut
*/
PARROT_WARN_UNUSED_RESULT
PARROT_CANNOT_RETURN_NULL
STRING *
Parrot_nci_describe_sig(PARROT_INTERP, ARGIN(PMC *sig))
{
ASSERT_ARGS(Parrot_nci_describe_sig)
STRING *s;
size_t n = VTABLE_elements(interp, sig);
size_t i;
/* return value */
s = Parrot_dt_get_datatype_name(interp, VTABLE_get_integer_keyed_int(interp, sig, 0));
/* arguments */
s = Parrot_str_concat(interp, s, CONST_STRING(interp, " ("));
for (i = 1; i < n; i++) {
s = Parrot_str_concat(interp, s, Parrot_dt_get_datatype_name(interp,
VTABLE_get_integer_keyed_int(interp, sig, i)));
if (i < n - 1)
s = Parrot_str_concat(interp, s, CONST_STRING(interp, ", "));
}
s = Parrot_str_concat(interp, s, CONST_STRING(interp, ")"));
return s;
}
/*
=back
=cut
*/
/*
* Local variables:
* c-file-style: "parrot"
* End:
* vim: expandtab shiftwidth=4 cinoptions='\:2=2' :
*/