C++ CvGV函数代码示例

/* helper to return the stash for a svref, (Sv|Cv|Gv|GvE)STASH */
static HV*
S_guess_stash(pTHX_ SV* sv)
{
    if (SvOBJECT(sv)) {
	return SvSTASH(sv);
    }
    else {
	HV *stash = NULL;
	switch (SvTYPE(sv)) {
	case SVt_PVCV:
	    if (CvGV(sv) && isGV(CvGV(sv)) && GvSTASH(CvGV(sv)))
		return GvSTASH(CvGV(sv));
	    else if (/* !CvANON(sv) && */ CvSTASH(sv))
		return CvSTASH(sv);
	    break;
	case SVt_PVGV:
	    if (isGV_with_GP(sv) && GvGP(sv) && GvESTASH(MUTABLE_GV(sv)))
		return GvESTASH(MUTABLE_GV(sv));
	    break;
	default:
	    break;
	}
        return stash;
    }
}

int
mop_get_code_info (SV *coderef, char **pkg, char **name)
{
    if (!SvOK(coderef) || !SvROK(coderef) || SvTYPE(SvRV(coderef)) != SVt_PVCV) {
        return 0;
    }

    coderef = SvRV(coderef);

    /* sub is still being compiled */
    if (!CvGV(coderef)) {
        return 0;
    }

    /* I think this only gets triggered with a mangled coderef, but if
       we hit it without the guard, we segfault. The slightly odd return
       value strikes me as an improvement (mst)
    */

    if ( isGV_with_GP(CvGV(coderef)) ) {
        GV *gv   = CvGV(coderef);
        *pkg     = HvNAME( GvSTASH(gv) ? GvSTASH(gv) : CvSTASH(coderef) );
        *name    = GvNAME( CvGV(coderef) );
    } else {
        *pkg     = "__UNKNOWN__";
        *name    = "__ANON__";
    }

    return 1;
}

modperl_handler_t *modperl_handler_new_from_sv(pTHX_ apr_pool_t *p, SV *sv)
{
    char *name = NULL;
    GV *gv;

    if (SvROK(sv)) {
        sv = SvRV(sv);
    }

    switch (SvTYPE(sv)) {
      case SVt_PV:
        name = SvPVX(sv);
        return modperl_handler_new(p, apr_pstrdup(p, name));
        break;
      case SVt_PVCV:
        if (CvANON((CV*)sv)) {
            return modperl_handler_new_anon(aTHX_ p, (CV*)sv);
        }
        if (!(gv = CvGV((CV*)sv))) {
            Perl_croak(aTHX_ "can't resolve the code reference");
        }
        name = apr_pstrcat(p, HvNAME(GvSTASH(gv)), "::", GvNAME(gv), NULL);
        return modperl_handler_new(p, name);
      default:
        break;
    };

    return NULL;
}

bool Stash::can(Raw_string name) const {
    if (stash) {
        GV* gv = gv_fetchmeth_autoload(stash, name.value, name.length, -1);
        return gv && isGV(gv) && CvGV(gv);
    }
    return false;
}

JSObject*
PJS_NewPerlSub(
    pTHX_
    JSContext *cx,
    JSObject *parent,
    SV *cvref
) {
    JSObject *newobj = PJS_CreateJSVis(
	    aTHX_ cx,
	    JS_NewObject(cx, &perlsub_class, NULL, parent),
	    cvref
    );

    if(newobj) {
	CV *cv = (CV *)SvRV(cvref);
	const char *fname = CvANON(cv) ? "(anonymous)" : GvENAME(CvGV(cv));
	JSString *jstr = JS_InternString(cx, fname);
	if(!jstr || !JS_DefineProperty(cx, newobj, "name",
		                      STRING_TO_JSVAL(jstr),
		                      NULL, NULL,
		                      JSPROP_READONLY | JSPROP_PERMANENT)
	) {
	    PJS_unrootJSVis(cx, newobj);
	    newobj = NULL;
	}
    }

    return newobj;
}

static SV *modperl_hv_request_find(pTHX_ SV *in, char *classname, CV *cv)
{
    static char *r_keys[] = { "r", "_r", NULL };
    HV *hv = (HV *)SvRV(in);
    SV *sv = (SV *)NULL;
    int i;

    for (i=0; r_keys[i]; i++) {
        int klen = i + 1; /* assumes r_keys[] will never change */
        SV **svp;

        if ((svp = hv_fetch(hv, r_keys[i], klen, FALSE)) && (sv = *svp)) {
            if (SvROK(sv) && (SvTYPE(SvRV(sv)) == SVt_PVHV)) {
                /* dig deeper */
                return modperl_hv_request_find(aTHX_ sv, classname, cv);
            }
            break;
        }
    }

    if (!sv) {
        Perl_croak(aTHX_
                   "method `%s' invoked by a `%s' object with no `r' key!",
                   cv ? GvNAME(CvGV(cv)) : "unknown",
                   (SvRV(in) && SvSTASH(SvRV(in)))
                       ? HvNAME(SvSTASH(SvRV(in)))
                       : "unknown");
    }

    return SvROK(sv) ? SvRV(sv) : sv;
}

void unroll_this(pTHX_ OP* op) {
    struct sljit_compiler* compiler = sljit_create_compiler();
    HV* seenops = newHV();

#ifdef DEBUG
    if (getenv("RUNOPS_OPTIMIZED_DEBUG")) {
        CV *runcv = Perl_find_runcv(NULL);
        sljit_compiler_verbose(compiler, stderr);

        DEBUGf(("Unroll %s::%s cv=%p, op=%p (%s)\n", HvNAME_get(CvSTASH(runcv)),
                GvENAME(CvGV(runcv)), runcv, op, sljit_get_platform_name()));
    }
#endif

    sljit_emit_enter(compiler, 0, 2, 1, 0);
    unroll_tree(compiler, seenops, op, NULL);
    fixup_jumps(compiler, needjumps, labels);
    // This is needed for things that drop off the runloop without a
    // return, e.g. S_sortcv. TODO: Make conditional?
    sljit_emit_return(compiler, SLJIT_MEM, (sljit_w) &PL_op);

    op->op_ppaddr = sljit_generate_code(compiler);
    op->op_spare = 3;
    DEBUGf(("Code at %p\n", op->op_ppaddr));

    labels = NULL;
    needjumps = NULL;
    SvREFCNT_dec(seenops);
    sljit_free_compiler(compiler);
}

GV *
Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
{
    register const char *nend;
    const char *nsplit = 0;
    GV* gv;

    for (nend = name; *nend; nend++) {
	if (*nend == '\'')
	    nsplit = nend;
	else if (*nend == ':' && *(nend + 1) == ':')
	    nsplit = ++nend;
    }
    if (nsplit) {
	const char *origname = name;
	name = nsplit + 1;
	if (*nsplit == ':')
	    --nsplit;
	if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
	    /* ->SUPER::method should really be looked up in original stash */
	    SV *tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
						  CopSTASHPV(PL_curcop)));
	    stash = gv_stashpvn(SvPVX(tmpstr), SvCUR(tmpstr), TRUE);
	    DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
			 origname, HvNAME(stash), name) );
	}
	else
	    stash = gv_stashpvn(origname, nsplit - origname, TRUE);
    }

    gv = gv_fetchmeth(stash, name, nend - name, 0);
    if (!gv) {
	if (strEQ(name,"import") || strEQ(name,"unimport"))
	    gv = (GV*)&PL_sv_yes;
	else if (autoload)
	    gv = gv_autoload4(stash, name, nend - name, TRUE);
    }
    else if (autoload) {
	CV* cv = GvCV(gv);
	if (!CvROOT(cv) && !CvXSUB(cv)) {
	    GV* stubgv;
	    GV* autogv;

	    if (CvANON(cv))
		stubgv = gv;
	    else {
		stubgv = CvGV(cv);
		if (GvCV(stubgv) != cv)		/* orphaned import */
		    stubgv = gv;
	    }
	    autogv = gv_autoload4(GvSTASH(stubgv),
				  GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
	    if (autogv)
		gv = autogv;
	}
    }

    return gv;
}

GV*
Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
{
    char autoload[] = "AUTOLOAD";
    STRLEN autolen = sizeof(autoload)-1;
    GV* gv;
    CV* cv;
    HV* varstash;
    GV* vargv;
    SV* varsv;

    if (len == autolen && strnEQ(name, autoload, autolen))
	return Nullgv;
    if (!(gv = gv_fetchmeth(stash, autoload, autolen, FALSE)))
	return Nullgv;
    cv = GvCV(gv);

    if (!CvROOT(cv))
	return Nullgv;

    /*
     * Inheriting AUTOLOAD for non-methods works ... for now.
     */
    if (ckWARN(WARN_DEPRECATED) && !method &&
	(GvCVGEN(gv) || GvSTASH(gv) != stash))
	Perl_warner(aTHX_ WARN_DEPRECATED,
	  "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
	     HvNAME(stash), (int)len, name);

    /*
     * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
     * The subroutine's original name may not be "AUTOLOAD", so we don't
     * use that, but for lack of anything better we will use the sub's
     * original package to look up $AUTOLOAD.
     */
    varstash = GvSTASH(CvGV(cv));
    vargv = *(GV**)hv_fetch(varstash, autoload, autolen, TRUE);
    ENTER;

#ifdef USE_THREADS
    sv_lock((SV *)varstash);
#endif
    if (!isGV(vargv))
	gv_init(vargv, varstash, autoload, autolen, FALSE);
    LEAVE;
    varsv = GvSV(vargv);
#ifdef USE_THREADS
    sv_lock(varsv);
#endif
    sv_setpv(varsv, HvNAME(stash));
    sv_catpvn(varsv, "::", 2);
    sv_catpvn(varsv, name, len);
    SvTAINTED_off(varsv);
    return gv;
}

void
Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
{
    register GP *gp;
    bool doproto = SvTYPE(gv) > SVt_NULL;
    char *proto = (doproto && SvPOK(gv)) ? SvPVX(gv) : NULL;

    sv_upgrade((SV*)gv, SVt_PVGV);
    if (SvLEN(gv)) {
	if (proto) {
	    SvPVX(gv) = NULL;
	    SvLEN(gv) = 0;
	    SvPOK_off(gv);
	} else
	    Safefree(SvPVX(gv));
    }
    Newz(602, gp, 1, GP);
    GvGP(gv) = gp_ref(gp);
    GvSV(gv) = NEWSV(72,0);
    GvLINE(gv) = CopLINE(PL_curcop);
    GvFILE(gv) = CopFILE(PL_curcop) ? CopFILE(PL_curcop) : "";
    GvCVGEN(gv) = 0;
    GvEGV(gv) = gv;
    sv_magic((SV*)gv, (SV*)gv, '*', Nullch, 0);
    GvSTASH(gv) = (HV*)SvREFCNT_inc(stash);
    GvNAME(gv) = savepvn(name, len);
    GvNAMELEN(gv) = len;
    if (multi || doproto)              /* doproto means it _was_ mentioned */
	GvMULTI_on(gv);
    if (doproto) {			/* Replicate part of newSUB here. */
	SvIOK_off(gv);
	ENTER;
	/* XXX unsafe for threads if eval_owner isn't held */
	start_subparse(0,0);		/* Create CV in compcv. */
	GvCV(gv) = PL_compcv;
	LEAVE;

	PL_sub_generation++;
	CvGV(GvCV(gv)) = gv;
	CvFILE(GvCV(gv)) = CopFILE(PL_curcop);
	CvSTASH(GvCV(gv)) = PL_curstash;
#ifdef USE_THREADS
	CvOWNER(GvCV(gv)) = 0;
	if (!CvMUTEXP(GvCV(gv))) {
	    New(666, CvMUTEXP(GvCV(gv)), 1, perl_mutex);
	    MUTEX_INIT(CvMUTEXP(GvCV(gv)));
	}
#endif /* USE_THREADS */
	if (proto) {
	    sv_setpv((SV*)GvCV(gv), proto);
	    Safefree(proto);
	}
    }
}

STATIC const char *
_sub_name( pTHX ) {
  const CV *const cv = _curcv( aTHX );
  if ( cv ) {
    const GV *const gv = CvGV( cv );
    if ( gv ) {
      return GvENAME( gv );
    }
  }

  return NULL;
}

request_rec *modperl_xs_sv2request_rec(pTHX_ SV *in, char *classname, CV *cv)
{
    SV *sv = (SV *)NULL;
    MAGIC *mg;

    if (SvROK(in)) {
        SV *rv = (SV*)SvRV(in);

        switch (SvTYPE(rv)) {
          case SVt_PVMG:
            sv = rv;
            break;
          case SVt_PVHV:
            sv = modperl_hv_request_find(aTHX_ in, classname, cv);
            break;
          default:
            Perl_croak(aTHX_ "panic: unsupported request_rec type %d",
                       (int)SvTYPE(rv));
        }
    }

    /* might be Apache2::ServerRec::warn method */
    if (!sv && !(classname && SvPOK(in) && !strEQ(classname, SvPVX(in)))) {
        request_rec *r = NULL;
        (void)modperl_tls_get_request_rec(&r);

        if (!r) {
            Perl_croak(aTHX_
                       "Apache2->%s called without setting Apache2->request!",
                       cv ? GvNAME(CvGV(cv)) : "unknown");
        }

        return r;
    }

    /* there could be pool magic attached to custom $r object, so make
     * sure that mg->mg_ptr is set */
    if ((mg = mg_find(sv, PERL_MAGIC_ext)) && mg->mg_ptr) {
        return (request_rec *)mg->mg_ptr;
    }
    else {
        if (classname && !sv_derived_from(in, classname)) {
            /* XXX: find something faster than sv_derived_from */
            return NULL;
        }
        return INT2PTR(request_rec *, SvIV(sv));
    }

    return NULL;
}

SV* THX_MopMcV_get_method(pTHX_ SV* metaclass, SV* name) {
    HV* stash = (HV*) SvRV(metaclass);

    HE* method_gv_he = hv_fetch_ent(stash, name, 0, 0);
    if (method_gv_he != NULL) {
        GV* method_gv = (GV*) HeVAL(method_gv_he);
        CV* method    = GvCV(method_gv);
        if (method != NULL && GvSTASH(CvGV(method)) == stash) {
            return newRV_inc((SV*) method);  
        }
    }
    
    return NULL;
}

bool THX_MopMcV_has_method(pTHX_ SV* metaclass, SV* name) {
    HV* stash = (HV*) SvRV(metaclass);

    HE* method_gv_he = hv_fetch_ent(stash, name, 0, 0);
    if (method_gv_he != NULL) {
        GV* method_gv = (GV*) HeVAL(method_gv_he);
        CV* method    = GvCV(method_gv);
        if (method != NULL && GvSTASH(CvGV(method)) == stash) {
            return TRUE;
        }
    }
    
    return FALSE;
}

STATIC void
S_croak_xs_usage(pTHX_ const CV *const cv, const char *const params)
{
    const GV *const gv = CvGV(cv);

    PERL_ARGS_ASSERT_CROAK_XS_USAGE;

    if (gv) {
        const char *const gvname = GvNAME(gv);
        const HV *const stash = GvSTASH(gv);
        const char *const hvname = stash ? HvNAME(stash) : NULL;

        if (hvname)
            Perl_croak(aTHX_ "Usage: %s::%s(%s)", hvname, gvname, params);
        else
            Perl_croak(aTHX_ "Usage: %s(%s)", gvname, params);
    } else {
        /* Pants. I don't think that it should be possible to get here. */
        Perl_croak(aTHX_ "Usage: CODE(0x%"UVxf")(%s)", PTR2UV(cv), params);
    }
}