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800 lines (634 loc) · 20.3 KB
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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.
*
*/
/*
* Any sufficiently advanced technology is indistinguishable from magic.
* --Arthur C. Clarke
*
* [_Profiles of the Future_]
*/
/* This file contains the code that implements functions in perl's "builtin::"
* namespace
*/
#include "EXTERN.h"
#define PERL_IN_BUILTIN_C
#include "perl.h"
#include "XSUB.h"
/* copied from op.c */
#define SHORTVER(maj,min) (((maj) << 8) | (min))
struct BuiltinFuncDescriptor {
const char *name;
U16 since_ver;
bool is_experimental;
XSUBADDR_t xsub;
OP *(*checker)(pTHX_ OP *, GV *, SV *);
IV ckval;
};
#define warn_experimental_builtin(name) S_warn_experimental_builtin(aTHX_ name)
static void S_warn_experimental_builtin(pTHX_ const char *name)
{
/* diag_listed_as: Built-in function '%s' is experimental */
ck_warner_d(packWARN(WARN_EXPERIMENTAL__BUILTIN),
"Built-in function 'builtin::%s' is experimental", name);
}
XS(XS_builtin_true);
XS(XS_builtin_true)
{
dXSARGS;
if(items)
croak_xs_usage(cv, "");
EXTEND(SP, 1);
XSRETURN_YES;
}
XS(XS_builtin_false);
XS(XS_builtin_false)
{
dXSARGS;
if(items)
croak_xs_usage(cv, "");
EXTEND(SP, 1);
XSRETURN_NO;
}
XS(XS_builtin_inf);
XS(XS_builtin_inf)
{
dXSARGS;
if(items)
croak_xs_usage(cv, "");
#ifdef DOUBLE_HAS_INF
EXTEND(SP, 1);
XSRETURN_NV(NV_INF);
#else
Perl_croak_nocontext("builtin::inf not implemented");
#endif
}
XS(XS_builtin_nan);
XS(XS_builtin_nan)
{
dXSARGS;
if(items)
croak_xs_usage(cv, "");
#ifdef DOUBLE_HAS_NAN
EXTEND(SP, 1);
XSRETURN_NV(NV_NAN);
#else
Perl_croak_nocontext("builtin::nan not implemented");
#endif
}
enum {
BUILTIN_CONST_FALSE,
BUILTIN_CONST_TRUE,
BUILTIN_CONST_INF,
BUILTIN_CONST_NAN,
};
static OP *ck_builtin_const(pTHX_ OP *entersubop, GV *namegv, SV *ckobj)
{
const struct BuiltinFuncDescriptor *builtin = NUM2PTR(const struct BuiltinFuncDescriptor *, SvUV(ckobj));
if(builtin->is_experimental)
warn_experimental_builtin(builtin->name);
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;
#ifdef DOUBLE_HAS_INF
case BUILTIN_CONST_INF: constval = newSVnv(NV_INF); break;
#else
case BUILTIN_CONST_INF: return entersubop;
#endif
#ifdef DOUBLE_HAS_NAN
case BUILTIN_CONST_NAN: constval = newSVnv(NV_NAN); break;
#else
case BUILTIN_CONST_NAN: return entersubop;
#endif
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_IS_BOOL:
warn_experimental_builtin(PL_op_name[ix]);
Perl_pp_is_bool(aTHX);
break;
case OP_IS_WEAK:
Perl_pp_is_weak(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;
case OP_CEIL:
Perl_pp_ceil(aTHX);
break;
case OP_FLOOR:
Perl_pp_floor(aTHX);
break;
case OP_IS_TAINTED:
Perl_pp_is_tainted(aTHX);
break;
case OP_STRINGIFY:
{
/* we could only call pp_stringify if we're sure there is a TARG
and if the XSUB is called from call_sv() or goto it may not
have one.
*/
dXSTARG;
sv_copypv(TARG, *PL_stack_sp);
SvSETMAGIC(TARG);
rpp_replace_1_1_NN(TARG);
}
break;
default:
die("panic: unhandled opcode %" IVdf
" for xs_builtin_func1_scalar()", (IV) ix);
}
XSRETURN(1);
}
XS(XS_builtin_trim);
XS(XS_builtin_trim)
{
dXSARGS;
if (items != 1) {
croak_xs_usage(cv, "arg");
}
dXSTARG;
SV *source = TOPs;
STRLEN len;
const U8 *start;
SvGETMAGIC(source);
if (SvOK(source))
start = (const U8*)SvPV_nomg_const(source, len);
else {
if (ckWARN(WARN_UNINITIALIZED))
report_uninit(source);
start = (const U8*)"";
len = 0;
}
if (DO_UTF8(source)) {
const U8 *end = start + len;
/* Find the first non-space */
while(len) {
STRLEN thislen;
if (!isSPACE_utf8_safe(start, end))
break;
start += (thislen = UTF8SKIP(start));
len -= thislen;
}
/* Find the final non-space */
STRLEN thislen;
const U8 *cur_end = end;
while ((thislen = is_SPACE_utf8_safe_backwards(cur_end, start))) {
cur_end -= thislen;
}
len -= (end - cur_end);
}
else if (len) {
while(len) {
if (!isSPACE_L1(*start))
break;
start++;
len--;
}
while(len) {
if (!isSPACE_L1(start[len-1]))
break;
len--;
}
}
sv_setpvn(TARG, (const char *)start, len);
if (DO_UTF8(source))
SvUTF8_on(TARG);
else
SvUTF8_off(TARG);
SETTARG;
XSRETURN(1);
}
XS(XS_builtin_export_lexically);
XS(XS_builtin_export_lexically)
{
dXSARGS;
warn_experimental_builtin("export_lexically");
if(!PL_compcv)
croak(
"export_lexically can only be called at compile time");
if(items % 2)
croak("Odd number of elements in export_lexically");
for(int i = 0; i < items; i += 2) {
SV *name = ST(i);
SV *ref = ST(i+1);
if(!SvROK(ref))
/* diag_listed_as: Expected %s reference in export_lexically */
croak("Expected a reference in export_lexically");
char sigil = SvPVX(name)[0];
SV *rv = SvRV(ref);
const char *bad = NULL;
switch(sigil) {
default:
/* overwrites the pointer on the stack; but this is fine, the
* caller's value isn't modified */
ST(i) = name = sv_2mortal(newSVpvf("&%" SVf, SVfARG(name)));
/* FALLTHROUGH */
case '&':
if(SvTYPE(rv) != SVt_PVCV)
bad = "a CODE";
break;
case '$':
/* Permit any of SVt_NULL to SVt_PVMG. Technically this also
* includes SVt_INVLIST but it isn't thought possible for pureperl
* code to ever manage to see one of those. */
if(SvTYPE(rv) > SVt_PVMG)
bad = "a SCALAR";
break;
case '@':
if(SvTYPE(rv) != SVt_PVAV)
bad = "an ARRAY";
break;
case '%':
if(SvTYPE(rv) != SVt_PVHV)
bad = "a HASH";
break;
}
if(bad)
croak("Expected %s reference in export_lexically", bad);
}
prepare_export_lexical();
for(int i = 0; i < items; i += 2) {
SV *name = ST(i);
SV *ref = ST(i+1);
export_lexical(name, SvRV(ref));
}
finish_export_lexical();
}
XS(XS_builtin_func1_void);
XS(XS_builtin_func1_void)
{
dXSARGS;
dXSI32;
if(items != 1)
croak_xs_usage(cv, "arg");
switch(ix) {
case OP_WEAKEN:
Perl_pp_weaken(aTHX);
break;
case OP_UNWEAKEN:
Perl_pp_unweaken(aTHX);
break;
default:
die("panic: unhandled opcode %" IVdf
" for xs_builtin_func1_void()", (IV) ix);
}
XSRETURN(0);
}
XS(XS_builtin_created_as_string)
{
dXSARGS;
if(items != 1)
croak_xs_usage(cv, "arg");
SV *arg = ST(0);
SvGETMAGIC(arg);
/* SV was created as string if it has POK and isn't bool */
ST(0) = boolSV(SvPOK(arg) && !SvIsBOOL(arg));
XSRETURN(1);
}
XS(XS_builtin_created_as_number)
{
dXSARGS;
if(items != 1)
croak_xs_usage(cv, "arg");
SV *arg = ST(0);
SvGETMAGIC(arg);
/* SV was created as number if it has NOK or IOK but not POK and is not bool */
ST(0) = boolSV(SvNIOK(arg) && !SvPOK(arg) && !SvIsBOOL(arg));
XSRETURN(1);
}
static OP *ck_builtin_func1(pTHX_ OP *entersubop, GV *namegv, SV *ckobj)
{
const struct BuiltinFuncDescriptor *builtin = NUM2PTR(const struct BuiltinFuncDescriptor *, SvUV(ckobj));
if(builtin->is_experimental)
warn_experimental_builtin(builtin->name);
SV *prototype = newSVpvs("$");
SAVEFREESV(prototype);
assert(entersubop->op_type == OP_ENTERSUB);
entersubop = ck_entersub_args_proto(entersubop, namegv, prototype);
OPCODE opcode = builtin->ckval;
if(!opcode)
return entersubop;
OP *pushop = cUNOPx(entersubop)->op_first;
if (!OpHAS_SIBLING(pushop)) {
pushop = cUNOPx(pushop)->op_first;
}
OP *argop = OpSIBLING(pushop);
if (!argop || !OpHAS_SIBLING(argop) || OpHAS_SIBLING(OpSIBLING(argop)))
return entersubop;
{
OP *const excised = op_sibling_splice(NULL, pushop, 1, NULL);
PERL_UNUSED_VAR(excised);
assert(excised == argop);
}
U8 wantflags = entersubop->op_flags & OPf_WANT;
op_free(entersubop);
if(opcode == OP_STRINGIFY)
/* Even though pp_stringify only looks at TOPs and conceptually works
* on a single argument, it happens to be a LISTOP. I've no idea why
*/
return newLISTOPn(opcode, wantflags,
argop,
NULL);
else {
OP * const op = newUNOP(opcode, wantflags, argop);
/* since these pp funcs can be called from XS, and XS may be called
without a normal ENTERSUB, we need to indicate to them that a targ
has been allocated.
*/
if (op->op_targ)
op->op_private |= OPpENTERSUB_HASTARG;
return op;
}
}
/* This does not use the XS() macro so that op.c can see its prototype */
void
Perl_XS_builtin_indexed(pTHX_ CV *cv)
{
PERL_ARGS_ASSERT_XS_BUILTIN_INDEXED;
dXSARGS;
PERL_UNUSED_ARG(cv);
switch(GIMME_V) {
case G_VOID:
ck_warner(packWARN(WARN_VOID),
"Useless use of %s in void context", "builtin::indexed");
XSRETURN(0);
case G_SCALAR:
ck_warner(packWARN(WARN_SCALAR),
"Useless use of %s in scalar context", "builtin::indexed");
ST(0) = sv_2mortal(newSViv(items * 2));
XSRETURN(1);
case G_LIST:
break;
}
SSize_t retcount = items * 2;
EXTEND(SP, retcount);
/* Copy from [items-1] down to [0] so we don't have to make
* temporary copies */
for(SSize_t index = items - 1; index >= 0; index--) {
/* Copy, not alias */
ST(index * 2 + 1) = sv_mortalcopy(ST(index));
ST(index * 2) = sv_2mortal(newSViv(index));
}
XSRETURN(retcount);
}
XS(XS_builtin_load_module);
XS(XS_builtin_load_module)
{
dXSARGS;
if (items != 1)
croak_xs_usage(cv, "arg");
SV *module_name = newSVsv(ST(0));
if (!SvPOK(module_name)) {
SvREFCNT_dec(module_name);
croak_xs_usage(cv, "defined string");
}
load_module(PERL_LOADMOD_NOIMPORT, module_name, NULL, NULL);
/* The loaded module's name is left intentionally on the stack for the
* caller's benefit, and becomes load_module's return value. */
XSRETURN(1);
}
/* These pp_ funcs all need to use dXSTARG */
PP(pp_refaddr)
{
dXSTARG;
SV *arg = *PL_stack_sp;
SvGETMAGIC(arg);
if(SvROK(arg))
sv_setuv_mg(TARG, PTR2UV(SvRV(arg)));
else {
sv_set_undef(TARG);
SvSETMAGIC(TARG);
}
rpp_replace_1_1_NN(TARG);
return NORMAL;
}
PP(pp_reftype)
{
dXSTARG;
SV *arg = *PL_stack_sp;
SvGETMAGIC(arg);
if(SvROK(arg))
sv_setpv_mg(TARG, sv_reftype(SvRV(arg), FALSE));
else {
sv_set_undef(TARG);
SvSETMAGIC(TARG);
}
rpp_replace_1_1_NN(TARG);
return NORMAL;
}
PP(pp_ceil)
{
dXSTARG;
TARGn(Perl_ceil(SvNVx(*PL_stack_sp)), 1);
rpp_replace_1_1_NN(TARG);
return NORMAL;
}
PP(pp_floor)
{
dXSTARG;
TARGn(Perl_floor(SvNVx(*PL_stack_sp)), 1);
rpp_replace_1_1_NN(TARG);
return NORMAL;
}
static OP *ck_builtin_funcN(pTHX_ OP *entersubop, GV *namegv, SV *ckobj)
{
const struct BuiltinFuncDescriptor *builtin = NUM2PTR(const struct BuiltinFuncDescriptor *, SvUV(ckobj));
if(builtin->is_experimental)
warn_experimental_builtin(builtin->name);
SV *prototype = newSVpvs("@");
SAVEFREESV(prototype);
assert(entersubop->op_type == OP_ENTERSUB);
entersubop = ck_entersub_args_proto(entersubop, namegv, prototype);
return entersubop;
}
static const char builtin_not_recognised[] = "'%" SVf "' is not recognised as a builtin function";
#define NO_BUNDLE SHORTVER(255,255)
static const struct BuiltinFuncDescriptor builtins[] = {
/* constants */
{ "true", SHORTVER(5,39), false, &XS_builtin_true, &ck_builtin_const, BUILTIN_CONST_TRUE },
{ "false", SHORTVER(5,39), false, &XS_builtin_false, &ck_builtin_const, BUILTIN_CONST_FALSE },
{ "inf", NO_BUNDLE, true, &XS_builtin_inf, &ck_builtin_const, BUILTIN_CONST_INF },
{ "nan", NO_BUNDLE, true, &XS_builtin_nan, &ck_builtin_const, BUILTIN_CONST_NAN },
/* unary functions */
{ "is_bool", NO_BUNDLE, true, &XS_builtin_func1_scalar, &ck_builtin_func1, OP_IS_BOOL },
{ "weaken", SHORTVER(5,39), false, &XS_builtin_func1_void, &ck_builtin_func1, OP_WEAKEN },
{ "unweaken", SHORTVER(5,39), false, &XS_builtin_func1_void, &ck_builtin_func1, OP_UNWEAKEN },
{ "is_weak", SHORTVER(5,39), false, &XS_builtin_func1_scalar, &ck_builtin_func1, OP_IS_WEAK },
{ "blessed", SHORTVER(5,39), false, &XS_builtin_func1_scalar, &ck_builtin_func1, OP_BLESSED },
{ "refaddr", SHORTVER(5,39), false, &XS_builtin_func1_scalar, &ck_builtin_func1, OP_REFADDR },
{ "reftype", SHORTVER(5,39), false, &XS_builtin_func1_scalar, &ck_builtin_func1, OP_REFTYPE },
{ "ceil", SHORTVER(5,39), false, &XS_builtin_func1_scalar, &ck_builtin_func1, OP_CEIL },
{ "floor", SHORTVER(5,39), false, &XS_builtin_func1_scalar, &ck_builtin_func1, OP_FLOOR },
{ "is_tainted", SHORTVER(5,39), false, &XS_builtin_func1_scalar, &ck_builtin_func1, OP_IS_TAINTED },
{ "trim", SHORTVER(5,39), false, &XS_builtin_trim, &ck_builtin_func1, 0 },
{ "stringify", NO_BUNDLE, true, &XS_builtin_func1_scalar, &ck_builtin_func1, OP_STRINGIFY },
{ "created_as_string", NO_BUNDLE, true, &XS_builtin_created_as_string, &ck_builtin_func1, 0 },
{ "created_as_number", NO_BUNDLE, true, &XS_builtin_created_as_number, &ck_builtin_func1, 0 },
{ "load_module", NO_BUNDLE, true, &XS_builtin_load_module, &ck_builtin_func1, 0 },
/* list functions */
{ "indexed", SHORTVER(5,39), false, &Perl_XS_builtin_indexed, &ck_builtin_funcN, 0 },
{ "export_lexically", NO_BUNDLE, true, &XS_builtin_export_lexically, NULL, 0 },
{ NULL, 0, false, NULL, NULL, 0 }
};
static bool S_parse_version(const char *vstr, const char *vend, UV *vmajor, UV *vminor)
{
/* Parse a string like "5.35" to yield 5 and 35. Ignores an optional
* trailing third component e.g. "5.35.7". Returns false on parse errors.
*/
const char *end = vend;
if (!grok_atoUV(vstr, vmajor, &end))
return FALSE;
vstr = end;
if (*vstr++ != '.')
return FALSE;
end = vend;
if (!grok_atoUV(vstr, vminor, &end))
return FALSE;
if(*vminor > 255)
return FALSE;
vstr = end;
if(vstr[0] == '.') {
vstr++;
UV _dummy;
if(!grok_atoUV(vstr, &_dummy, &end))
return FALSE;
if(_dummy > 255)
return FALSE;
vstr = end;
}
if(vstr != vend)
return FALSE;
return TRUE;
}
#define import_sym(sym) S_import_sym(aTHX_ sym)
static void S_import_sym(pTHX_ SV *sym)
{
SV *ampname = sv_2mortal(newSVpvf("&%" SVf, SVfARG(sym)));
SV *fqname = sv_2mortal(newSVpvf("builtin::%" SVf, SVfARG(sym)));
CV *cv = get_cv(SvPV_nolen(fqname), SvUTF8(fqname) ? SVf_UTF8 : 0);
if(!cv)
croak(builtin_not_recognised, sym);
export_lexical(ampname, (SV *)cv);
}
#define cv_is_builtin(cv) S_cv_is_builtin(aTHX_ cv)
static bool S_cv_is_builtin(pTHX_ CV *cv)
{
char *file = CvFILE(cv);
return file && strEQ(file, __FILE__);
}
void
Perl_import_builtin_bundle(pTHX_ U16 ver)
{
PERL_ARGS_ASSERT_IMPORT_BUILTIN_BUNDLE;
SV *ampname = sv_newmortal();
for(int i = 0; builtins[i].name; i++) {
sv_setpvf(ampname, "&%s", builtins[i].name);
bool want = (builtins[i].since_ver <= ver);
bool got = false;
PADOFFSET off = pad_findmy_sv(ampname, 0);
CV *cv;
if(off != NOT_IN_PAD &&
SvTYPE((cv = (CV *)PL_curpad[off])) == SVt_PVCV &&
cv_is_builtin(cv))
got = true;
if(!got && want) {
import_sym(newSVpvn_flags(builtins[i].name, strlen(builtins[i].name), SVs_TEMP));
}
}
}
XS(XS_builtin_import);
XS(XS_builtin_import)
{
dXSARGS;
if(!PL_compcv)
croak(
"builtin::import can only be called at compile time");
prepare_export_lexical();
for(int i = 1; i < items; i++) {
SV *sym = ST(i);
STRLEN symlen;
const char *sympv = SvPV(sym, symlen);
if(strEQ(sympv, "import"))
croak(builtin_not_recognised, sym);
if(sympv[0] == ':') {
UV vmajor, vminor;
if(!S_parse_version(sympv + 1, sympv + symlen, &vmajor, &vminor))
croak("Invalid version bundle %" SVf_QUOTEDPREFIX, sym);
U16 want_ver = SHORTVER(vmajor, vminor);
if(want_ver < SHORTVER(5,39) ||
/* round up devel version to next major release; e.g. 5.39 => 5.40 */
want_ver > SHORTVER(PERL_REVISION, PERL_VERSION + (PERL_VERSION % 2)))
croak("Builtin version bundle \"%s\" is not supported by Perl " PERL_VERSION_STRING,
sympv);
import_builtin_bundle(want_ver);
continue;
}
import_sym(sym);
}
finish_export_lexical();
}
void
Perl_boot_core_builtin(pTHX)
{
PERL_ARGS_ASSERT_BOOT_CORE_BUILTIN;
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 = "$";
else if(builtin->checker == &ck_builtin_funcN)
proto = "@";
SV *name = newSVpvs_flags("builtin::", SVs_TEMP);
sv_catpv(name, builtin->name);
CV *cv = newXS_flags(SvPV_nolen(name), builtin->xsub, __FILE__, proto, 0);
XSANY.any_i32 = builtin->ckval;
if ( builtin->xsub == &XS_builtin_func1_void
|| builtin->xsub == &XS_builtin_func1_scalar)
{
/* these XS functions just call out to the relevant pp()
* functions, so they must operate with a reference-counted
* stack if the pp() do too.
*/
CvXS_RCSTACK_on(cv);
}
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:
*/