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[perl5.git] / universal.c
index 4c98510..66eafc5 100644 (file)
@@ -205,7 +205,7 @@ Perl_sv_does_sv(pTHX_ SV *sv, SV *namesv, U32 flags)
        return FALSE;
     }
 
-    if (sv_isobject(sv)) {
+    if (SvROK(sv) && SvOBJECT(SvRV(sv))) {
        classname = sv_ref(NULL,SvRV(sv),TRUE);
     } else {
        classname = sv;
@@ -222,15 +222,18 @@ Perl_sv_does_sv(pTHX_ SV *sv, SV *namesv, U32 flags)
     PUSHs(namesv);
     PUTBACK;
 
-    methodname = newSVpvs_flags("isa", SVs_TEMP);
-    /* ugly hack: use the SvSCREAM flag so S_method_common
-     * can figure out we're calling DOES() and not isa(),
-     * and report eventual errors correctly. --rgs */
-    SvSCREAM_on(methodname);
+    /* create a PV with value "isa", but with a special address
+     * so that perl knows we're really doing "DOES" instead */
+    methodname = newSV_type(SVt_PV);
+    SvLEN_set(methodname, 0);
+    SvCUR_set(methodname, strlen(PL_isa_DOES));
+    SvPVX(methodname) = (char *)PL_isa_DOES; /* discard 'const' qualifier */
+    SvPOK_on(methodname);
+    sv_2mortal(methodname);
     call_sv(methodname, G_SCALAR | G_METHOD);
     SPAGAIN;
 
-    does_it = SvTRUE( TOPs );
+    does_it = SvTRUE_NN( TOPs );
     FREETMPS;
     LEAVE;
 
@@ -294,7 +297,8 @@ A specialised variant of C<croak()> for emitting the usage message for xsubs
 works out the package name and subroutine name from C<cv>, and then calls
 C<croak()>.  Hence if C<cv> is C<&ouch::awk>, it would call C<croak> as:
 
-    Perl_croak(aTHX_ "Usage: %"SVf"::%"SVf"(%s)", "ouch" "awk", "eee_yow");
+ Perl_croak(aTHX_ "Usage: %" SVf "::%" SVf "(%s)", "ouch" "awk",
+                                                     "eee_yow");
 
 =cut
 */
@@ -312,13 +316,13 @@ Perl_croak_xs_usage(const CV *const cv, const char *const params)
 
        if (HvNAME_get(stash))
            /* diag_listed_as: SKIPME */
-           Perl_croak_nocontext("Usage: %"HEKf"::%"HEKf"(%s)",
+           Perl_croak_nocontext("Usage: %" HEKf "::%" HEKf "(%s)",
                                 HEKfARG(HvNAME_HEK(stash)),
                                 HEKfARG(GvNAME_HEK(gv)),
                                 params);
        else
            /* diag_listed_as: SKIPME */
-           Perl_croak_nocontext("Usage: %"HEKf"(%s)",
+           Perl_croak_nocontext("Usage: %" HEKf "(%s)",
                                 HEKfARG(GvNAME_HEK(gv)), params);
     } else {
         dTHX;
@@ -326,7 +330,7 @@ Perl_croak_xs_usage(const CV *const cv, const char *const params)
 
        /* Pants. I don't think that it should be possible to get here. */
        /* diag_listed_as: SKIPME */
-       Perl_croak(aTHX_ "Usage: CODE(0x%"UVxf")(%s)", PTR2UV(cv), params);
+       Perl_croak(aTHX_ "Usage: CODE(0x%" UVxf ")(%s)", PTR2UV(cv), params);
     }
 }
 
@@ -505,9 +509,10 @@ XS(XS_utf8_downgrade)
     if (items < 1 || items > 2)
        croak_xs_usage(cv, "sv, failok=0");
     else {
-       SV * const sv = ST(0);
-        const bool failok = (items < 2) ? 0 : SvTRUE(ST(1)) ? 1 : 0;
-        const bool RETVAL = sv_utf8_downgrade(sv, failok);
+       SV * const sv0 = ST(0);
+       SV * const sv1 = ST(1);
+        const bool failok = (items < 2) ? 0 : SvTRUE_NN(sv1) ? 1 : 0;
+        const bool RETVAL = sv_utf8_downgrade(sv0, failok);
 
        ST(0) = boolSV(RETVAL);
     }
@@ -523,7 +528,7 @@ XS(XS_utf8_native_to_unicode)
  if (items > 1)
      croak_xs_usage(cv, "sv");
 
- ST(0) = sv_2mortal(newSViv(NATIVE_TO_UNI(uv)));
+ ST(0) = sv_2mortal(newSVuv(NATIVE_TO_UNI(uv)));
  XSRETURN(1);
 }
 
@@ -536,7 +541,7 @@ XS(XS_utf8_unicode_to_native)
  if (items > 1)
      croak_xs_usage(cv, "sv");
 
- ST(0) = sv_2mortal(newSViv(UNI_TO_NATIVE(uv)));
+ ST(0) = sv_2mortal(newSVuv(UNI_TO_NATIVE(uv)));
  XSRETURN(1);
 }
 
@@ -546,7 +551,6 @@ XS(XS_Internals_SvREADONLY) /* This is dangerous stuff. */
     dXSARGS;
     SV * const svz = ST(0);
     SV * sv;
-    PERL_UNUSED_ARG(cv);
 
     /* [perl #77776] - called as &foo() not foo() */
     if (!SvROK(svz))
@@ -561,10 +565,8 @@ XS(XS_Internals_SvREADONLY)        /* This is dangerous stuff. */
             XSRETURN_NO;
     }
     else if (items == 2) {
-       if (SvTRUE(ST(1))) {
-#ifdef PERL_OLD_COPY_ON_WRITE
-           if (SvIsCOW(sv)) sv_force_normal(sv);
-#endif
+        SV *sv1 = ST(1);
+       if (SvTRUE_NN(sv1)) {
            SvFLAGS(sv) |= SVf_READONLY;
            XSRETURN_YES;
        }
@@ -583,7 +585,6 @@ XS(XS_constant__make_const) /* This is dangerous stuff. */
     dXSARGS;
     SV * const svz = ST(0);
     SV * sv;
-    PERL_UNUSED_ARG(cv);
 
     /* [perl #77776] - called as &foo() not foo() */
     if (!SvROK(svz) || items != 1)
@@ -591,9 +592,6 @@ XS(XS_constant__make_const) /* This is dangerous stuff. */
 
     sv = SvRV(svz);
 
-#ifdef PERL_OLD_COPY_ON_WRITE
-    if (SvIsCOW(sv)) sv_force_normal(sv);
-#endif
     SvREADONLY_on(sv);
     if (SvTYPE(sv) == SVt_PVAV && AvFILLp(sv) != -1) {
        /* for constant.pm; nobody else should be calling this
@@ -614,7 +612,6 @@ XS(XS_Internals_SvREFCNT)   /* This is dangerous stuff. */
     SV * const svz = ST(0);
     SV * sv;
     U32 refcnt;
-    PERL_UNUSED_ARG(cv);
 
     /* [perl #77776] - called as &foo() not foo() */
     if ((items != 1 && items != 2) || !SvROK(svz))
@@ -670,19 +667,19 @@ XS(XS_PerlIO_get_layers)
 
                  switch (*key) {
                  case 'i':
-                      if (klen == 5 && memEQ(key, "input", 5)) {
+                       if (memEQs(key, klen, "input")) {
                            input = SvTRUE(*valp);
                            break;
                       }
                       goto fail;
                  case 'o': 
-                      if (klen == 6 && memEQ(key, "output", 6)) {
+                       if (memEQs(key, klen, "output")) {
                            input = !SvTRUE(*valp);
                            break;
                       }
                       goto fail;
                  case 'd':
-                      if (klen == 7 && memEQ(key, "details", 7)) {
+                       if (memEQs(key, klen, "details")) {
                            details = SvTRUE(*valp);
                            break;
                       }
@@ -742,7 +739,7 @@ XS(XS_PerlIO_get_layers)
                  }
                  else {
                       if (namok && argok)
-                           PUSHs(sv_2mortal(Perl_newSVpvf(aTHX_ "%"SVf"(%"SVf")",
+                           PUSHs(sv_2mortal(Perl_newSVpvf(aTHX_ "%" SVf "(%" SVf ")",
                                                 SVfARG(*namsvp),
                                                 SVfARG(*argsvp))));
                       else if (namok)
@@ -771,12 +768,10 @@ XS(XS_PerlIO_get_layers)
     XSRETURN(0);
 }
 
-
 XS(XS_re_is_regexp); /* prototype to pass -Wmissing-prototypes */
 XS(XS_re_is_regexp)
 {
     dXSARGS;
-    PERL_UNUSED_VAR(cv);
 
     if (items != 1)
        croak_xs_usage(cv, "sv");
@@ -798,9 +793,6 @@ XS(XS_re_regnames_count)
     if (items != 0)
        croak_xs_usage(cv, "");
 
-    SP -= items;
-    PUTBACK;
-
     if (!rx)
         XSRETURN_UNDEF;
 
@@ -830,7 +822,7 @@ XS(XS_re_regname)
     if (!rx)
         XSRETURN_UNDEF;
 
-    if (items == 2 && SvTRUE(ST(1))) {
+    if (items == 2 && SvTRUE_NN(ST(1))) {
         flags = RXapif_ALL;
     } else {
         flags = RXapif_ONE;
@@ -863,7 +855,7 @@ XS(XS_re_regnames)
     if (!rx)
         XSRETURN_UNDEF;
 
-    if (items == 1 && SvTRUE(ST(0))) {
+    if (items == 1 && SvTRUE_NN(ST(0))) {
         flags = RXapif_ALL;
     } else {
         flags = RXapif_ONE;
@@ -967,12 +959,7 @@ XS(XS_re_regexp_pattern)
         } else {
             /* Scalar, so use the string that Perl would return */
             /* return the pattern in (?msixn:..) format */
-#if PERL_VERSION >= 11
             pattern = sv_2mortal(newSVsv(MUTABLE_SV(re)));
-#else
-            pattern = newSVpvn_flags(RX_WRAPPED(re), RX_WRAPLEN(re),
-                                    (RX_UTF8(re) ? SVf_UTF8 : 0) | SVs_TEMP);
-#endif
             PUSHs(pattern);
             XSRETURN(1);
         }
@@ -999,6 +986,25 @@ XS(XS_re_regexp_pattern)
     NOT_REACHED; /* NOTREACHED */
 }
 
+#ifdef HAS_GETCWD
+
+XS(XS_Internals_getcwd)
+{
+    dXSARGS;
+    SV *sv = sv_newmortal();
+
+    if (items != 0)
+        croak_xs_usage(cv, "");
+
+    (void)getcwd_sv(sv);
+
+    SvTAINTED_on(sv);
+    PUSHs(sv);
+    XSRETURN(1);
+}
+
+#endif
+
 #include "vutil.h"
 #include "vxs.inc"
 
@@ -1008,7 +1014,7 @@ struct xsub_details {
     const char *proto;
 };
 
-static const struct xsub_details details[] = {
+static const struct xsub_details these_details[] = {
     {"UNIVERSAL::isa", XS_UNIVERSAL_isa, NULL},
     {"UNIVERSAL::can", XS_UNIVERSAL_can, NULL},
     {"UNIVERSAL::DOES", XS_UNIVERSAL_DOES, NULL},
@@ -1024,28 +1030,96 @@ static const struct xsub_details details[] = {
     {"utf8::native_to_unicode", XS_utf8_native_to_unicode, NULL},
     {"utf8::unicode_to_native", XS_utf8_unicode_to_native, NULL},
     {"Internals::SvREADONLY", XS_Internals_SvREADONLY, "\\[$%@];$"},
-    {"constant::_make_const", XS_constant__make_const, "\\[$@]"},
     {"Internals::SvREFCNT", XS_Internals_SvREFCNT, "\\[$%@];$"},
     {"Internals::hv_clear_placeholders", XS_Internals_hv_clear_placehold, "\\%"},
+    {"constant::_make_const", XS_constant__make_const, "\\[$@]"},
     {"PerlIO::get_layers", XS_PerlIO_get_layers, "*;@"},
     {"re::is_regexp", XS_re_is_regexp, "$"},
     {"re::regname", XS_re_regname, ";$$"},
     {"re::regnames", XS_re_regnames, ";$"},
     {"re::regnames_count", XS_re_regnames_count, ""},
     {"re::regexp_pattern", XS_re_regexp_pattern, "$"},
+#ifdef HAS_GETCWD
+    {"Internals::getcwd", XS_Internals_getcwd, ""},
+#endif
 };
 
+STATIC OP*
+optimize_out_native_convert_function(pTHX_ OP* entersubop,
+                                           GV* namegv,
+                                           SV* protosv)
+{
+    /* Optimizes out an identity function, i.e., one that just returns its
+     * argument.  The passed in function is assumed to be an identity function,
+     * with no checking.  This is designed to be called for utf8_to_native()
+     * and native_to_utf8() on ASCII platforms, as they just return their
+     * arguments, but it could work on any such function.
+     *
+     * The code is mostly just cargo-culted from Memoize::Lift */
+
+    OP *pushop, *argop;
+    OP *parent;
+    SV* prototype = newSVpvs("$");
+
+    PERL_UNUSED_ARG(protosv);
+
+    assert(entersubop->op_type == OP_ENTERSUB);
+
+    entersubop = ck_entersub_args_proto(entersubop, namegv, prototype);
+    parent = entersubop;
+
+    SvREFCNT_dec(prototype);
+
+    pushop = cUNOPx(entersubop)->op_first;
+    if (! OpHAS_SIBLING(pushop)) {
+        parent = pushop;
+        pushop = cUNOPx(pushop)->op_first;
+    }
+    argop = OpSIBLING(pushop);
+
+    /* Carry on without doing the optimization if it is not something we're
+     * expecting, so continues to work */
+    if (   ! argop
+        || ! OpHAS_SIBLING(argop)
+        ||   OpHAS_SIBLING(OpSIBLING(argop))
+    ) {
+        return entersubop;
+    }
+
+    /* cut argop from the subtree */
+    (void)op_sibling_splice(parent, pushop, 1, NULL);
+
+    op_free(entersubop);
+    return argop;
+}
+
 void
 Perl_boot_core_UNIVERSAL(pTHX)
 {
     static const char file[] = __FILE__;
-    const struct xsub_details *xsub = details;
-    const struct xsub_details *end = C_ARRAY_END(details);
+    const struct xsub_details *xsub = these_details;
+    const struct xsub_details *end = C_ARRAY_END(these_details);
 
     do {
        newXS_flags(xsub->name, xsub->xsub, file, xsub->proto, 0);
     } while (++xsub < end);
 
+#ifndef EBCDIC
+    { /* On ASCII platforms these functions just return their argument, so can
+         be optimized away */
+
+        CV* to_native_cv = get_cv("utf8::unicode_to_native", 0);
+        CV* to_unicode_cv = get_cv("utf8::native_to_unicode", 0);
+
+        cv_set_call_checker_flags(to_native_cv,
+                            optimize_out_native_convert_function,
+                            (SV*) to_native_cv, 0);
+        cv_set_call_checker_flags(to_unicode_cv,
+                            optimize_out_native_convert_function,
+                            (SV*) to_unicode_cv, 0);
+    }
+#endif
+
     /* Providing a Regexp::DESTROY fixes #21347. See test in t/op/ref.t  */
     {
        CV * const cv =
@@ -1059,11 +1133,5 @@ Perl_boot_core_UNIVERSAL(pTHX)
 }
 
 /*
- * Local variables:
- * c-indentation-style: bsd
- * c-basic-offset: 4
- * indent-tabs-mode: nil
- * End:
- *
  * ex: set ts=8 sts=4 sw=4 et:
  */