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/* builtin.c
*
* Copyright (C) 2021 by Paul Evans and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/* This file contains the code that implements functions in perl's "builtin::"
* namespace
*/
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
struct BuiltinFuncDescriptor {
const char *name;
XSUBADDR_t xsub;
OP *(*checker)(pTHX_ OP *, GV *, SV *);
IV ckval;
};
XS(XS_builtin_true);
XS(XS_builtin_true)
{
dXSARGS;
if(items)
croak_xs_usage(cv, "");
XSRETURN_YES;
}
XS(XS_builtin_false);
XS(XS_builtin_false)
{
dXSARGS;
if(items)
croak_xs_usage(cv, "");
XSRETURN_NO;
}
enum {
BUILTIN_CONST_FALSE,
BUILTIN_CONST_TRUE,
};
static OP *ck_builtin_const(pTHX_ OP *entersubop, GV *namegv, SV *ckobj)
{
const struct BuiltinFuncDescriptor *builtin = NUM2PTR(const struct BuiltinFuncDescriptor *, SvUV(ckobj));
SV *prototype = newSVpvs("");
SAVEFREESV(prototype);
assert(entersubop->op_type == OP_ENTERSUB);
entersubop = ck_entersub_args_proto(entersubop, namegv, prototype);
SV *constval;
switch(builtin->ckval) {
case BUILTIN_CONST_FALSE: constval = &PL_sv_no; break;
case BUILTIN_CONST_TRUE: constval = &PL_sv_yes; break;
default:
DIE(aTHX_ "panic: unrecognised builtin_const value %" IVdf, builtin->ckval);
break;
}
op_free(entersubop);
return newSVOP(OP_CONST, 0, constval);
}
XS(XS_builtin_func1_scalar);
XS(XS_builtin_func1_scalar)
{
dXSARGS;
dXSI32;
if(items != 1)
croak_xs_usage(cv, "arg");
switch(ix) {
case OP_ISBOOL:
Perl_pp_isbool(aTHX);
break;
case OP_ISWEAK:
Perl_pp_isweak(aTHX);
break;
case OP_BLESSED:
Perl_pp_blessed(aTHX);
break;
case OP_REFADDR:
Perl_pp_refaddr(aTHX);
break;
case OP_REFTYPE:
Perl_pp_reftype(aTHX);
break;
default:
Perl_die(aTHX_ "panic: unhandled opcode %d for xs_builtin_func1_scalar()", ix);
}
XSRETURN(1);
}
XS(XS_builtin_func1_void);
XS(XS_builtin_func1_void)
{
dXSARGS;
dXSI32;
if(items != 1)
croak_xs_usage(cv, "arg");
switch(ix) {
case OP_WEAKEN:
Perl_pp_weaken(aTHX);
break;
case OP_UNWEAKEN:
Perl_pp_unweaken(aTHX);
break;
default:
Perl_die(aTHX_ "panic: unhandled opcode %d for xs_builtin_func1_void()", ix);
}
XSRETURN(0);
}
static OP *ck_builtin_func1(pTHX_ OP *entersubop, GV *namegv, SV *ckobj)
{
const struct BuiltinFuncDescriptor *builtin = NUM2PTR(const struct BuiltinFuncDescriptor *, SvUV(ckobj));
SV *prototype = newSVpvs("$");
SAVEFREESV(prototype);
assert(entersubop->op_type == OP_ENTERSUB);
entersubop = ck_entersub_args_proto(entersubop, namegv, prototype);
OP *parent = entersubop, *pushop, *argop;
pushop = cUNOPx(entersubop)->op_first;
if (!OpHAS_SIBLING(pushop)) {
pushop = cUNOPx(pushop)->op_first;
}
argop = OpSIBLING(pushop);
if (!argop || !OpHAS_SIBLING(argop) || OpHAS_SIBLING(OpSIBLING(argop)))
return entersubop;
(void)op_sibling_splice(parent, pushop, 1, NULL);
U8 wantflags = entersubop->op_flags & OPf_WANT;
op_free(entersubop);
OPCODE opcode = builtin->ckval;
return newUNOP(opcode, wantflags, argop);
}
static const char builtin_not_recognised[] = "'%" SVf "' is not recognised as a builtin function";
static const struct BuiltinFuncDescriptor builtins[] = {
/* constants */
{ "builtin::true", &XS_builtin_true, &ck_builtin_const, BUILTIN_CONST_TRUE },
{ "builtin::false", &XS_builtin_false, &ck_builtin_const, BUILTIN_CONST_FALSE },
/* unary functions */
{ "builtin::isbool", &XS_builtin_func1_scalar, &ck_builtin_func1, OP_ISBOOL },
{ "builtin::weaken", &XS_builtin_func1_void, &ck_builtin_func1, OP_WEAKEN },
{ "builtin::unweaken", &XS_builtin_func1_void, &ck_builtin_func1, OP_UNWEAKEN },
{ "builtin::isweak", &XS_builtin_func1_scalar, &ck_builtin_func1, OP_ISWEAK },
{ "builtin::blessed", &XS_builtin_func1_scalar, &ck_builtin_func1, OP_BLESSED },
{ "builtin::refaddr", &XS_builtin_func1_scalar, &ck_builtin_func1, OP_REFADDR },
{ "builtin::reftype", &XS_builtin_func1_scalar, &ck_builtin_func1, OP_REFTYPE },
{ 0 }
};
XS(XS_builtin_import);
XS(XS_builtin_import)
{
dXSARGS;
if(!PL_compcv)
Perl_croak(aTHX_
"builtin::import can only be called at compiletime");
/* We need to have PL_comppad / PL_curpad set correctly for lexical importing */
ENTER;
SAVESPTR(PL_comppad_name); PL_comppad_name = PadlistNAMES(CvPADLIST(PL_compcv));
SAVESPTR(PL_comppad); PL_comppad = PadlistARRAY(CvPADLIST(PL_compcv))[1];
SAVESPTR(PL_curpad); PL_curpad = PadARRAY(PL_comppad);
for(int i = 1; i < items; i++) {
SV *sym = ST(i);
if(strEQ(SvPV_nolen(sym), "import"))
Perl_croak(aTHX_ builtin_not_recognised, sym);
SV *ampname = sv_2mortal(Perl_newSVpvf(aTHX_ "&%" SVf, SVfARG(sym)));
SV *fqname = sv_2mortal(Perl_newSVpvf(aTHX_ "builtin::%" SVf, SVfARG(sym)));
CV *cv = get_cv(SvPV_nolen(fqname), SvUTF8(fqname) ? SVf_UTF8 : 0);
if(!cv)
Perl_croak(aTHX_ builtin_not_recognised, sym);
PADOFFSET off = pad_add_name_sv(ampname, padadd_STATE, 0, 0);
SvREFCNT_dec(PL_curpad[off]);
PL_curpad[off] = SvREFCNT_inc(cv);
}
intro_my();
LEAVE;
}
void
Perl_boot_core_builtin(pTHX)
{
I32 i;
for(i = 0; builtins[i].name; i++) {
const struct BuiltinFuncDescriptor *builtin = &builtins[i];
const char *proto = NULL;
if(builtin->checker == &ck_builtin_const)
proto = "";
else if(builtin->checker == &ck_builtin_func1)
proto = "$";
CV *cv = newXS_flags(builtin->name, builtin->xsub, __FILE__, proto, 0);
XSANY.any_i32 = builtin->ckval;
if(builtin->checker) {
cv_set_call_checker_flags(cv, builtin->checker, newSVuv(PTR2UV(builtin)), 0);
}
}
newXS_flags("builtin::import", &XS_builtin_import, __FILE__, NULL, 0);
}
/*
* ex: set ts=8 sts=4 sw=4 et:
*/
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