1 | /* gv.c |
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2 | * |
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3 | * Copyright (c) 1991-2002, Larry Wall |
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4 | * |
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5 | * You may distribute under the terms of either the GNU General Public |
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6 | * License or the Artistic License, as specified in the README file. |
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7 | * |
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8 | */ |
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9 | |
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10 | /* |
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11 | * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure |
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12 | * of your inquisitiveness, I shall spend all the rest of my days answering |
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13 | * you. What more do you want to know?' |
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14 | * 'The names of all the stars, and of all living things, and the whole |
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15 | * history of Middle-earth and Over-heaven and of the Sundering Seas,' |
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16 | * laughed Pippin. |
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17 | */ |
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18 | |
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19 | /* |
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20 | =head1 GV Functions |
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21 | */ |
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22 | |
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23 | #include "EXTERN.h" |
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24 | #define PERL_IN_GV_C |
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25 | #include "perl.h" |
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26 | |
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27 | GV * |
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28 | Perl_gv_AVadd(pTHX_ register GV *gv) |
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29 | { |
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30 | if (!gv || SvTYPE((SV*)gv) != SVt_PVGV) |
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31 | Perl_croak(aTHX_ "Bad symbol for array"); |
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32 | if (!GvAV(gv)) |
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33 | GvAV(gv) = newAV(); |
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34 | return gv; |
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35 | } |
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36 | |
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37 | GV * |
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38 | Perl_gv_HVadd(pTHX_ register GV *gv) |
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39 | { |
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40 | if (!gv || SvTYPE((SV*)gv) != SVt_PVGV) |
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41 | Perl_croak(aTHX_ "Bad symbol for hash"); |
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42 | if (!GvHV(gv)) |
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43 | GvHV(gv) = newHV(); |
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44 | return gv; |
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45 | } |
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46 | |
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47 | GV * |
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48 | Perl_gv_IOadd(pTHX_ register GV *gv) |
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49 | { |
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50 | if (!gv || SvTYPE((SV*)gv) != SVt_PVGV) |
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51 | Perl_croak(aTHX_ "Bad symbol for filehandle"); |
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52 | if (!GvIOp(gv)) { |
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53 | #ifdef GV_UNIQUE_CHECK |
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54 | if (GvUNIQUE(gv)) { |
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55 | Perl_croak(aTHX_ "Bad symbol for filehandle (GV is unique)"); |
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56 | } |
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57 | #endif |
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58 | GvIOp(gv) = newIO(); |
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59 | } |
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60 | return gv; |
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61 | } |
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62 | |
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63 | GV * |
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64 | Perl_gv_fetchfile(pTHX_ const char *name) |
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65 | { |
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66 | char smallbuf[256]; |
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67 | char *tmpbuf; |
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68 | STRLEN tmplen; |
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69 | GV *gv; |
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70 | |
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71 | if (!PL_defstash) |
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72 | return Nullgv; |
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73 | |
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74 | tmplen = strlen(name) + 2; |
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75 | if (tmplen < sizeof smallbuf) |
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76 | tmpbuf = smallbuf; |
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77 | else |
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78 | New(603, tmpbuf, tmplen + 1, char); |
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79 | /* This is where the debugger's %{"::_<$filename"} hash is created */ |
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80 | tmpbuf[0] = '_'; |
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81 | tmpbuf[1] = '<'; |
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82 | strcpy(tmpbuf + 2, name); |
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83 | gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE); |
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84 | if (!isGV(gv)) { |
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85 | gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE); |
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86 | sv_setpv(GvSV(gv), name); |
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87 | if (PERLDB_LINE) |
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88 | hv_magic(GvHVn(gv_AVadd(gv)), Nullgv, PERL_MAGIC_dbfile); |
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89 | } |
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90 | if (tmpbuf != smallbuf) |
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91 | Safefree(tmpbuf); |
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92 | return gv; |
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93 | } |
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94 | |
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95 | void |
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96 | Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi) |
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97 | { |
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98 | register GP *gp; |
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99 | bool doproto = SvTYPE(gv) > SVt_NULL; |
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100 | char *proto = (doproto && SvPOK(gv)) ? SvPVX(gv) : NULL; |
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101 | |
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102 | sv_upgrade((SV*)gv, SVt_PVGV); |
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103 | if (SvLEN(gv)) { |
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104 | if (proto) { |
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105 | SvPVX(gv) = NULL; |
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106 | SvLEN(gv) = 0; |
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107 | SvPOK_off(gv); |
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108 | } else |
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109 | Safefree(SvPVX(gv)); |
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110 | } |
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111 | Newz(602, gp, 1, GP); |
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112 | GvGP(gv) = gp_ref(gp); |
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113 | GvSV(gv) = NEWSV(72,0); |
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114 | GvLINE(gv) = CopLINE(PL_curcop); |
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115 | GvFILE(gv) = CopFILE(PL_curcop) ? CopFILE(PL_curcop) : ""; |
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116 | GvCVGEN(gv) = 0; |
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117 | GvEGV(gv) = gv; |
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118 | sv_magic((SV*)gv, (SV*)gv, PERL_MAGIC_glob, Nullch, 0); |
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119 | GvSTASH(gv) = (HV*)SvREFCNT_inc(stash); |
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120 | GvNAME(gv) = savepvn(name, len); |
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121 | GvNAMELEN(gv) = len; |
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122 | if (multi || doproto) /* doproto means it _was_ mentioned */ |
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123 | GvMULTI_on(gv); |
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124 | if (doproto) { /* Replicate part of newSUB here. */ |
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125 | SvIOK_off(gv); |
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126 | ENTER; |
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127 | /* XXX unsafe for threads if eval_owner isn't held */ |
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128 | start_subparse(0,0); /* Create CV in compcv. */ |
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129 | GvCV(gv) = PL_compcv; |
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130 | LEAVE; |
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131 | |
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132 | PL_sub_generation++; |
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133 | CvGV(GvCV(gv)) = gv; |
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134 | CvFILE_set_from_cop(GvCV(gv), PL_curcop); |
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135 | CvSTASH(GvCV(gv)) = PL_curstash; |
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136 | #ifdef USE_5005THREADS |
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137 | CvOWNER(GvCV(gv)) = 0; |
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138 | if (!CvMUTEXP(GvCV(gv))) { |
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139 | New(666, CvMUTEXP(GvCV(gv)), 1, perl_mutex); |
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140 | MUTEX_INIT(CvMUTEXP(GvCV(gv))); |
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141 | } |
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142 | #endif /* USE_5005THREADS */ |
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143 | if (proto) { |
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144 | sv_setpv((SV*)GvCV(gv), proto); |
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145 | Safefree(proto); |
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146 | } |
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147 | } |
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148 | } |
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149 | |
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150 | STATIC void |
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151 | S_gv_init_sv(pTHX_ GV *gv, I32 sv_type) |
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152 | { |
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153 | switch (sv_type) { |
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154 | case SVt_PVIO: |
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155 | (void)GvIOn(gv); |
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156 | break; |
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157 | case SVt_PVAV: |
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158 | (void)GvAVn(gv); |
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159 | break; |
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160 | case SVt_PVHV: |
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161 | (void)GvHVn(gv); |
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162 | break; |
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163 | } |
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164 | } |
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165 | |
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166 | /* |
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167 | =for apidoc gv_fetchmeth |
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168 | |
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169 | Returns the glob with the given C<name> and a defined subroutine or |
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170 | C<NULL>. The glob lives in the given C<stash>, or in the stashes |
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171 | accessible via @ISA and UNIVERSAL::. |
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172 | |
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173 | The argument C<level> should be either 0 or -1. If C<level==0>, as a |
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174 | side-effect creates a glob with the given C<name> in the given C<stash> |
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175 | which in the case of success contains an alias for the subroutine, and sets |
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176 | up caching info for this glob. Similarly for all the searched stashes. |
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177 | |
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178 | This function grants C<"SUPER"> token as a postfix of the stash name. The |
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179 | GV returned from C<gv_fetchmeth> may be a method cache entry, which is not |
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180 | visible to Perl code. So when calling C<call_sv>, you should not use |
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181 | the GV directly; instead, you should use the method's CV, which can be |
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182 | obtained from the GV with the C<GvCV> macro. |
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183 | |
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184 | =cut |
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185 | */ |
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186 | |
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187 | GV * |
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188 | Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level) |
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189 | { |
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190 | AV* av; |
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191 | GV* topgv; |
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192 | GV* gv; |
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193 | GV** gvp; |
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194 | CV* cv; |
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195 | |
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196 | /* UNIVERSAL methods should be callable without a stash */ |
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197 | if (!stash) { |
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198 | level = -1; /* probably appropriate */ |
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199 | if(!(stash = gv_stashpvn("UNIVERSAL", 9, FALSE))) |
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200 | return 0; |
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201 | } |
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202 | |
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203 | if ((level > 100) || (level < -100)) |
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204 | Perl_croak(aTHX_ "Recursive inheritance detected while looking for method '%s' in package '%s'", |
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205 | name, HvNAME(stash)); |
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206 | |
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207 | DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,HvNAME(stash)) ); |
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208 | |
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209 | gvp = (GV**)hv_fetch(stash, name, len, (level >= 0)); |
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210 | if (!gvp) |
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211 | topgv = Nullgv; |
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212 | else { |
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213 | topgv = *gvp; |
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214 | if (SvTYPE(topgv) != SVt_PVGV) |
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215 | gv_init(topgv, stash, name, len, TRUE); |
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216 | if ((cv = GvCV(topgv))) { |
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217 | /* If genuine method or valid cache entry, use it */ |
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218 | if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation) |
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219 | return topgv; |
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220 | /* Stale cached entry: junk it */ |
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221 | SvREFCNT_dec(cv); |
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222 | GvCV(topgv) = cv = Nullcv; |
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223 | GvCVGEN(topgv) = 0; |
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224 | } |
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225 | else if (GvCVGEN(topgv) == PL_sub_generation) |
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226 | return 0; /* cache indicates sub doesn't exist */ |
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227 | } |
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228 | |
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229 | gvp = (GV**)hv_fetch(stash, "ISA", 3, FALSE); |
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230 | av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : Nullav; |
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231 | |
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232 | /* create and re-create @.*::SUPER::ISA on demand */ |
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233 | if (!av || !SvMAGIC(av)) { |
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234 | char* packname = HvNAME(stash); |
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235 | STRLEN packlen = strlen(packname); |
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236 | |
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237 | if (packlen >= 7 && strEQ(packname + packlen - 7, "::SUPER")) { |
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238 | HV* basestash; |
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239 | |
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240 | packlen -= 7; |
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241 | basestash = gv_stashpvn(packname, packlen, TRUE); |
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242 | gvp = (GV**)hv_fetch(basestash, "ISA", 3, FALSE); |
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243 | if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) { |
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244 | gvp = (GV**)hv_fetch(stash, "ISA", 3, TRUE); |
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245 | if (!gvp || !(gv = *gvp)) |
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246 | Perl_croak(aTHX_ "Cannot create %s::ISA", HvNAME(stash)); |
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247 | if (SvTYPE(gv) != SVt_PVGV) |
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248 | gv_init(gv, stash, "ISA", 3, TRUE); |
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249 | SvREFCNT_dec(GvAV(gv)); |
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250 | GvAV(gv) = (AV*)SvREFCNT_inc(av); |
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251 | } |
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252 | } |
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253 | } |
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254 | |
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255 | if (av) { |
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256 | SV** svp = AvARRAY(av); |
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257 | /* NOTE: No support for tied ISA */ |
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258 | I32 items = AvFILLp(av) + 1; |
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259 | while (items--) { |
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260 | SV* sv = *svp++; |
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261 | HV* basestash = gv_stashsv(sv, FALSE); |
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262 | if (!basestash) { |
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263 | if (ckWARN(WARN_MISC)) |
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264 | Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %s for @%s::ISA", |
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265 | SvPVX(sv), HvNAME(stash)); |
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266 | continue; |
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267 | } |
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268 | gv = gv_fetchmeth(basestash, name, len, |
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269 | (level >= 0) ? level + 1 : level - 1); |
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270 | if (gv) |
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271 | goto gotcha; |
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272 | } |
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273 | } |
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274 | |
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275 | /* if at top level, try UNIVERSAL */ |
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276 | |
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277 | if (level == 0 || level == -1) { |
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278 | HV* lastchance; |
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279 | |
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280 | if ((lastchance = gv_stashpvn("UNIVERSAL", 9, FALSE))) { |
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281 | if ((gv = gv_fetchmeth(lastchance, name, len, |
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282 | (level >= 0) ? level + 1 : level - 1))) |
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283 | { |
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284 | gotcha: |
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285 | /* |
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286 | * Cache method in topgv if: |
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287 | * 1. topgv has no synonyms (else inheritance crosses wires) |
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288 | * 2. method isn't a stub (else AUTOLOAD fails spectacularly) |
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289 | */ |
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290 | if (topgv && |
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291 | GvREFCNT(topgv) == 1 && |
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292 | (cv = GvCV(gv)) && |
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293 | (CvROOT(cv) || CvXSUB(cv))) |
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294 | { |
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295 | if ((cv = GvCV(topgv))) |
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296 | SvREFCNT_dec(cv); |
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297 | GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv)); |
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298 | GvCVGEN(topgv) = PL_sub_generation; |
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299 | } |
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300 | return gv; |
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301 | } |
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302 | else if (topgv && GvREFCNT(topgv) == 1) { |
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303 | /* cache the fact that the method is not defined */ |
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304 | GvCVGEN(topgv) = PL_sub_generation; |
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305 | } |
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306 | } |
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307 | } |
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308 | |
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309 | return 0; |
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310 | } |
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311 | |
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312 | /* |
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313 | =for apidoc gv_fetchmeth_autoload |
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314 | |
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315 | Same as gv_fetchmeth(), but looks for autoloaded subroutines too. |
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316 | Returns a glob for the subroutine. |
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317 | |
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318 | For an autoloaded subroutine without a GV, will create a GV even |
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319 | if C<level < 0>. For an autoloaded subroutine without a stub, GvCV() |
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320 | of the result may be zero. |
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321 | |
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322 | =cut |
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323 | */ |
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324 | |
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325 | GV * |
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326 | Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level) |
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327 | { |
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328 | GV *gv = gv_fetchmeth(stash, name, len, level); |
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329 | |
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330 | if (!gv) { |
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331 | char autoload[] = "AUTOLOAD"; |
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332 | STRLEN autolen = sizeof(autoload)-1; |
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333 | CV *cv; |
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334 | GV **gvp; |
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335 | |
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336 | if (!stash) |
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337 | return Nullgv; /* UNIVERSAL::AUTOLOAD could cause trouble */ |
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338 | if (len == autolen && strnEQ(name, autoload, autolen)) |
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339 | return Nullgv; |
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340 | if (!(gv = gv_fetchmeth(stash, autoload, autolen, FALSE))) |
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341 | return Nullgv; |
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342 | cv = GvCV(gv); |
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343 | if (!(CvROOT(cv) || CvXSUB(cv))) |
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344 | return Nullgv; |
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345 | /* Have an autoload */ |
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346 | if (level < 0) /* Cannot do without a stub */ |
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347 | gv_fetchmeth(stash, name, len, 0); |
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348 | gvp = (GV**)hv_fetch(stash, name, len, (level >= 0)); |
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349 | if (!gvp) |
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350 | return Nullgv; |
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351 | return *gvp; |
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352 | } |
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353 | return gv; |
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354 | } |
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355 | |
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356 | /* |
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357 | =for apidoc gv_fetchmethod |
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358 | |
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359 | See L<gv_fetchmethod_autoload>. |
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360 | |
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361 | =cut |
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362 | */ |
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363 | |
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364 | GV * |
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365 | Perl_gv_fetchmethod(pTHX_ HV *stash, const char *name) |
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366 | { |
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367 | return gv_fetchmethod_autoload(stash, name, TRUE); |
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368 | } |
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369 | |
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370 | /* |
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371 | =for apidoc gv_fetchmethod_autoload |
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372 | |
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373 | Returns the glob which contains the subroutine to call to invoke the method |
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374 | on the C<stash>. In fact in the presence of autoloading this may be the |
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375 | glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is |
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376 | already setup. |
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377 | |
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378 | The third parameter of C<gv_fetchmethod_autoload> determines whether |
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379 | AUTOLOAD lookup is performed if the given method is not present: non-zero |
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380 | means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD. |
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381 | Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload> |
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382 | with a non-zero C<autoload> parameter. |
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383 | |
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384 | These functions grant C<"SUPER"> token as a prefix of the method name. Note |
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385 | that if you want to keep the returned glob for a long time, you need to |
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386 | check for it being "AUTOLOAD", since at the later time the call may load a |
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387 | different subroutine due to $AUTOLOAD changing its value. Use the glob |
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388 | created via a side effect to do this. |
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389 | |
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390 | These functions have the same side-effects and as C<gv_fetchmeth> with |
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391 | C<level==0>. C<name> should be writable if contains C<':'> or C<' |
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392 | ''>. The warning against passing the GV returned by C<gv_fetchmeth> to |
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393 | C<call_sv> apply equally to these functions. |
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394 | |
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395 | =cut |
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396 | */ |
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397 | |
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398 | GV * |
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399 | Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload) |
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400 | { |
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401 | register const char *nend; |
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402 | const char *nsplit = 0; |
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403 | GV* gv; |
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404 | |
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405 | for (nend = name; *nend; nend++) { |
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406 | if (*nend == '\'') |
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407 | nsplit = nend; |
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408 | else if (*nend == ':' && *(nend + 1) == ':') |
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409 | nsplit = ++nend; |
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410 | } |
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411 | if (nsplit) { |
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412 | const char *origname = name; |
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413 | name = nsplit + 1; |
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414 | if (*nsplit == ':') |
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415 | --nsplit; |
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416 | if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) { |
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417 | /* ->SUPER::method should really be looked up in original stash */ |
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418 | SV *tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER", |
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419 | CopSTASHPV(PL_curcop))); |
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420 | /* __PACKAGE__::SUPER stash should be autovivified */ |
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421 | stash = gv_stashpvn(SvPVX(tmpstr), SvCUR(tmpstr), TRUE); |
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422 | DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n", |
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423 | origname, HvNAME(stash), name) ); |
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424 | } |
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425 | else { |
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426 | /* don't autovifify if ->NoSuchStash::method */ |
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427 | stash = gv_stashpvn(origname, nsplit - origname, FALSE); |
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428 | |
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429 | /* however, explicit calls to Pkg::SUPER::method may |
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430 | happen, and may require autovivification to work */ |
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431 | if (!stash && (nsplit - origname) >= 7 && |
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432 | strnEQ(nsplit - 7, "::SUPER", 7) && |
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433 | gv_stashpvn(origname, nsplit - origname - 7, FALSE)) |
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434 | stash = gv_stashpvn(origname, nsplit - origname, TRUE); |
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435 | } |
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436 | } |
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437 | |
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438 | gv = gv_fetchmeth(stash, name, nend - name, 0); |
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439 | if (!gv) { |
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440 | if (strEQ(name,"import") || strEQ(name,"unimport")) |
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441 | gv = (GV*)&PL_sv_yes; |
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442 | else if (autoload) |
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443 | gv = gv_autoload4(stash, name, nend - name, TRUE); |
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444 | } |
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445 | else if (autoload) { |
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446 | CV* cv = GvCV(gv); |
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447 | if (!CvROOT(cv) && !CvXSUB(cv)) { |
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448 | GV* stubgv; |
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449 | GV* autogv; |
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450 | |
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451 | if (CvANON(cv)) |
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452 | stubgv = gv; |
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453 | else { |
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454 | stubgv = CvGV(cv); |
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455 | if (GvCV(stubgv) != cv) /* orphaned import */ |
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456 | stubgv = gv; |
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457 | } |
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458 | autogv = gv_autoload4(GvSTASH(stubgv), |
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459 | GvNAME(stubgv), GvNAMELEN(stubgv), TRUE); |
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460 | if (autogv) |
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461 | gv = autogv; |
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462 | } |
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463 | } |
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464 | |
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465 | return gv; |
---|
466 | } |
---|
467 | |
---|
468 | GV* |
---|
469 | Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method) |
---|
470 | { |
---|
471 | char autoload[] = "AUTOLOAD"; |
---|
472 | STRLEN autolen = sizeof(autoload)-1; |
---|
473 | GV* gv; |
---|
474 | CV* cv; |
---|
475 | HV* varstash; |
---|
476 | GV* vargv; |
---|
477 | SV* varsv; |
---|
478 | |
---|
479 | if (!stash) |
---|
480 | return Nullgv; /* UNIVERSAL::AUTOLOAD could cause trouble */ |
---|
481 | if (len == autolen && strnEQ(name, autoload, autolen)) |
---|
482 | return Nullgv; |
---|
483 | if (!(gv = gv_fetchmeth(stash, autoload, autolen, FALSE))) |
---|
484 | return Nullgv; |
---|
485 | cv = GvCV(gv); |
---|
486 | |
---|
487 | if (!(CvROOT(cv) || CvXSUB(cv))) |
---|
488 | return Nullgv; |
---|
489 | |
---|
490 | /* |
---|
491 | * Inheriting AUTOLOAD for non-methods works ... for now. |
---|
492 | */ |
---|
493 | if (ckWARN2(WARN_DEPRECATED, WARN_SYNTAX) && !method && |
---|
494 | (GvCVGEN(gv) || GvSTASH(gv) != stash)) |
---|
495 | Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX), |
---|
496 | "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated", |
---|
497 | HvNAME(stash), (int)len, name); |
---|
498 | |
---|
499 | #ifndef USE_5005THREADS |
---|
500 | if (CvXSUB(cv)) { |
---|
501 | /* rather than lookup/init $AUTOLOAD here |
---|
502 | * only to have the XSUB do another lookup for $AUTOLOAD |
---|
503 | * and split that value on the last '::', |
---|
504 | * pass along the same data via some unused fields in the CV |
---|
505 | */ |
---|
506 | CvSTASH(cv) = stash; |
---|
507 | SvPVX(cv) = (char *)name; /* cast to lose constness warning */ |
---|
508 | SvCUR(cv) = len; |
---|
509 | return gv; |
---|
510 | } |
---|
511 | #endif |
---|
512 | |
---|
513 | /* |
---|
514 | * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name. |
---|
515 | * The subroutine's original name may not be "AUTOLOAD", so we don't |
---|
516 | * use that, but for lack of anything better we will use the sub's |
---|
517 | * original package to look up $AUTOLOAD. |
---|
518 | */ |
---|
519 | varstash = GvSTASH(CvGV(cv)); |
---|
520 | vargv = *(GV**)hv_fetch(varstash, autoload, autolen, TRUE); |
---|
521 | ENTER; |
---|
522 | |
---|
523 | #ifdef USE_5005THREADS |
---|
524 | sv_lock((SV *)varstash); |
---|
525 | #endif |
---|
526 | if (!isGV(vargv)) |
---|
527 | gv_init(vargv, varstash, autoload, autolen, FALSE); |
---|
528 | LEAVE; |
---|
529 | varsv = GvSV(vargv); |
---|
530 | #ifdef USE_5005THREADS |
---|
531 | sv_lock(varsv); |
---|
532 | #endif |
---|
533 | sv_setpv(varsv, HvNAME(stash)); |
---|
534 | sv_catpvn(varsv, "::", 2); |
---|
535 | sv_catpvn(varsv, name, len); |
---|
536 | SvTAINTED_off(varsv); |
---|
537 | return gv; |
---|
538 | } |
---|
539 | |
---|
540 | /* The "gv" parameter should be the glob known to Perl code as *! |
---|
541 | * The scalar must already have been magicalized. |
---|
542 | */ |
---|
543 | STATIC void |
---|
544 | S_require_errno(pTHX_ GV *gv) |
---|
545 | { |
---|
546 | HV* stash = gv_stashpvn("Errno",5,FALSE); |
---|
547 | |
---|
548 | if (!stash || !(gv_fetchmethod(stash, "TIEHASH"))) { |
---|
549 | dSP; |
---|
550 | PUTBACK; |
---|
551 | ENTER; |
---|
552 | save_scalar(gv); /* keep the value of $! */ |
---|
553 | Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, |
---|
554 | newSVpvn("Errno",5), Nullsv); |
---|
555 | LEAVE; |
---|
556 | SPAGAIN; |
---|
557 | stash = gv_stashpvn("Errno",5,FALSE); |
---|
558 | if (!stash || !(gv_fetchmethod(stash, "TIEHASH"))) |
---|
559 | Perl_croak(aTHX_ "Can't use %%! because Errno.pm is not available"); |
---|
560 | } |
---|
561 | } |
---|
562 | |
---|
563 | /* |
---|
564 | =for apidoc gv_stashpv |
---|
565 | |
---|
566 | Returns a pointer to the stash for a specified package. C<name> should |
---|
567 | be a valid UTF-8 string. If C<create> is set then the package will be |
---|
568 | created if it does not already exist. If C<create> is not set and the |
---|
569 | package does not exist then NULL is returned. |
---|
570 | |
---|
571 | =cut |
---|
572 | */ |
---|
573 | |
---|
574 | HV* |
---|
575 | Perl_gv_stashpv(pTHX_ const char *name, I32 create) |
---|
576 | { |
---|
577 | return gv_stashpvn(name, strlen(name), create); |
---|
578 | } |
---|
579 | |
---|
580 | HV* |
---|
581 | Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 create) |
---|
582 | { |
---|
583 | char smallbuf[256]; |
---|
584 | char *tmpbuf; |
---|
585 | HV *stash; |
---|
586 | GV *tmpgv; |
---|
587 | |
---|
588 | if (namelen + 3 < sizeof smallbuf) |
---|
589 | tmpbuf = smallbuf; |
---|
590 | else |
---|
591 | New(606, tmpbuf, namelen + 3, char); |
---|
592 | Copy(name,tmpbuf,namelen,char); |
---|
593 | tmpbuf[namelen++] = ':'; |
---|
594 | tmpbuf[namelen++] = ':'; |
---|
595 | tmpbuf[namelen] = '\0'; |
---|
596 | tmpgv = gv_fetchpv(tmpbuf, create, SVt_PVHV); |
---|
597 | if (tmpbuf != smallbuf) |
---|
598 | Safefree(tmpbuf); |
---|
599 | if (!tmpgv) |
---|
600 | return 0; |
---|
601 | if (!GvHV(tmpgv)) |
---|
602 | GvHV(tmpgv) = newHV(); |
---|
603 | stash = GvHV(tmpgv); |
---|
604 | if (!HvNAME(stash)) |
---|
605 | HvNAME(stash) = savepv(name); |
---|
606 | return stash; |
---|
607 | } |
---|
608 | |
---|
609 | /* |
---|
610 | =for apidoc gv_stashsv |
---|
611 | |
---|
612 | Returns a pointer to the stash for a specified package, which must be a |
---|
613 | valid UTF-8 string. See C<gv_stashpv>. |
---|
614 | |
---|
615 | =cut |
---|
616 | */ |
---|
617 | |
---|
618 | HV* |
---|
619 | Perl_gv_stashsv(pTHX_ SV *sv, I32 create) |
---|
620 | { |
---|
621 | register char *ptr; |
---|
622 | STRLEN len; |
---|
623 | ptr = SvPV(sv,len); |
---|
624 | return gv_stashpvn(ptr, len, create); |
---|
625 | } |
---|
626 | |
---|
627 | |
---|
628 | GV * |
---|
629 | Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) |
---|
630 | { |
---|
631 | register const char *name = nambeg; |
---|
632 | register GV *gv = 0; |
---|
633 | GV**gvp; |
---|
634 | I32 len; |
---|
635 | register const char *namend; |
---|
636 | HV *stash = 0; |
---|
637 | |
---|
638 | if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */ |
---|
639 | name++; |
---|
640 | |
---|
641 | for (namend = name; *namend; namend++) { |
---|
642 | if ((*namend == ':' && namend[1] == ':') |
---|
643 | || (*namend == '\'' && namend[1])) |
---|
644 | { |
---|
645 | if (!stash) |
---|
646 | stash = PL_defstash; |
---|
647 | if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */ |
---|
648 | return Nullgv; |
---|
649 | |
---|
650 | len = namend - name; |
---|
651 | if (len > 0) { |
---|
652 | char smallbuf[256]; |
---|
653 | char *tmpbuf; |
---|
654 | |
---|
655 | if (len + 3 < sizeof (smallbuf)) |
---|
656 | tmpbuf = smallbuf; |
---|
657 | else |
---|
658 | New(601, tmpbuf, len+3, char); |
---|
659 | Copy(name, tmpbuf, len, char); |
---|
660 | tmpbuf[len++] = ':'; |
---|
661 | tmpbuf[len++] = ':'; |
---|
662 | tmpbuf[len] = '\0'; |
---|
663 | gvp = (GV**)hv_fetch(stash,tmpbuf,len,add); |
---|
664 | gv = gvp ? *gvp : Nullgv; |
---|
665 | if (gv && gv != (GV*)&PL_sv_undef) { |
---|
666 | if (SvTYPE(gv) != SVt_PVGV) |
---|
667 | gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI)); |
---|
668 | else |
---|
669 | GvMULTI_on(gv); |
---|
670 | } |
---|
671 | if (tmpbuf != smallbuf) |
---|
672 | Safefree(tmpbuf); |
---|
673 | if (!gv || gv == (GV*)&PL_sv_undef) |
---|
674 | return Nullgv; |
---|
675 | |
---|
676 | if (!(stash = GvHV(gv))) |
---|
677 | stash = GvHV(gv) = newHV(); |
---|
678 | |
---|
679 | if (!HvNAME(stash)) |
---|
680 | HvNAME(stash) = savepvn(nambeg, namend - nambeg); |
---|
681 | } |
---|
682 | |
---|
683 | if (*namend == ':') |
---|
684 | namend++; |
---|
685 | namend++; |
---|
686 | name = namend; |
---|
687 | if (!*name) |
---|
688 | return gv ? gv : (GV*)*hv_fetch(PL_defstash, "main::", 6, TRUE); |
---|
689 | } |
---|
690 | } |
---|
691 | len = namend - name; |
---|
692 | if (!len) |
---|
693 | len = 1; |
---|
694 | |
---|
695 | /* No stash in name, so see how we can default */ |
---|
696 | |
---|
697 | if (!stash) { |
---|
698 | if (isIDFIRST_lazy(name)) { |
---|
699 | bool global = FALSE; |
---|
700 | |
---|
701 | if (isUPPER(*name)) { |
---|
702 | if (*name == 'S' && ( |
---|
703 | strEQ(name, "SIG") || |
---|
704 | strEQ(name, "STDIN") || |
---|
705 | strEQ(name, "STDOUT") || |
---|
706 | strEQ(name, "STDERR"))) |
---|
707 | global = TRUE; |
---|
708 | else if (*name == 'I' && strEQ(name, "INC")) |
---|
709 | global = TRUE; |
---|
710 | else if (*name == 'E' && strEQ(name, "ENV")) |
---|
711 | global = TRUE; |
---|
712 | else if (*name == 'A' && ( |
---|
713 | strEQ(name, "ARGV") || |
---|
714 | strEQ(name, "ARGVOUT"))) |
---|
715 | global = TRUE; |
---|
716 | } |
---|
717 | else if (*name == '_' && !name[1]) |
---|
718 | global = TRUE; |
---|
719 | |
---|
720 | if (global) |
---|
721 | stash = PL_defstash; |
---|
722 | else if ((COP*)PL_curcop == &PL_compiling) { |
---|
723 | stash = PL_curstash; |
---|
724 | if (add && (PL_hints & HINT_STRICT_VARS) && |
---|
725 | sv_type != SVt_PVCV && |
---|
726 | sv_type != SVt_PVGV && |
---|
727 | sv_type != SVt_PVFM && |
---|
728 | sv_type != SVt_PVIO && |
---|
729 | !(len == 1 && sv_type == SVt_PV && strchr("ab",*name)) ) |
---|
730 | { |
---|
731 | gvp = (GV**)hv_fetch(stash,name,len,0); |
---|
732 | if (!gvp || |
---|
733 | *gvp == (GV*)&PL_sv_undef || |
---|
734 | SvTYPE(*gvp) != SVt_PVGV) |
---|
735 | { |
---|
736 | stash = 0; |
---|
737 | } |
---|
738 | else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) || |
---|
739 | (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) || |
---|
740 | (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) ) |
---|
741 | { |
---|
742 | Perl_warn(aTHX_ "Variable \"%c%s\" is not imported", |
---|
743 | sv_type == SVt_PVAV ? '@' : |
---|
744 | sv_type == SVt_PVHV ? '%' : '$', |
---|
745 | name); |
---|
746 | if (GvCVu(*gvp)) |
---|
747 | Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name); |
---|
748 | stash = 0; |
---|
749 | } |
---|
750 | } |
---|
751 | } |
---|
752 | else |
---|
753 | stash = CopSTASH(PL_curcop); |
---|
754 | } |
---|
755 | else |
---|
756 | stash = PL_defstash; |
---|
757 | } |
---|
758 | |
---|
759 | /* By this point we should have a stash and a name */ |
---|
760 | |
---|
761 | if (!stash) { |
---|
762 | if (add) { |
---|
763 | qerror(Perl_mess(aTHX_ |
---|
764 | "Global symbol \"%s%s\" requires explicit package name", |
---|
765 | (sv_type == SVt_PV ? "$" |
---|
766 | : sv_type == SVt_PVAV ? "@" |
---|
767 | : sv_type == SVt_PVHV ? "%" |
---|
768 | : ""), name)); |
---|
769 | stash = PL_nullstash; |
---|
770 | } |
---|
771 | else |
---|
772 | return Nullgv; |
---|
773 | } |
---|
774 | |
---|
775 | if (!SvREFCNT(stash)) /* symbol table under destruction */ |
---|
776 | return Nullgv; |
---|
777 | |
---|
778 | gvp = (GV**)hv_fetch(stash,name,len,add); |
---|
779 | if (!gvp || *gvp == (GV*)&PL_sv_undef) |
---|
780 | return Nullgv; |
---|
781 | gv = *gvp; |
---|
782 | if (SvTYPE(gv) == SVt_PVGV) { |
---|
783 | if (add) { |
---|
784 | GvMULTI_on(gv); |
---|
785 | gv_init_sv(gv, sv_type); |
---|
786 | if (*name=='!' && sv_type == SVt_PVHV && len==1) |
---|
787 | require_errno(gv); |
---|
788 | } |
---|
789 | return gv; |
---|
790 | } else if (add & GV_NOINIT) { |
---|
791 | return gv; |
---|
792 | } |
---|
793 | |
---|
794 | /* Adding a new symbol */ |
---|
795 | |
---|
796 | if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL)) |
---|
797 | Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg); |
---|
798 | gv_init(gv, stash, name, len, add & GV_ADDMULTI); |
---|
799 | gv_init_sv(gv, sv_type); |
---|
800 | |
---|
801 | if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE) |
---|
802 | : (PL_dowarn & G_WARN_ON ) ) ) |
---|
803 | GvMULTI_on(gv) ; |
---|
804 | |
---|
805 | /* set up magic where warranted */ |
---|
806 | switch (*name) { |
---|
807 | case 'A': |
---|
808 | if (strEQ(name, "ARGV")) { |
---|
809 | IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START; |
---|
810 | } |
---|
811 | break; |
---|
812 | case 'E': |
---|
813 | if (strnEQ(name, "EXPORT", 6)) |
---|
814 | GvMULTI_on(gv); |
---|
815 | break; |
---|
816 | case 'I': |
---|
817 | if (strEQ(name, "ISA")) { |
---|
818 | AV* av = GvAVn(gv); |
---|
819 | GvMULTI_on(gv); |
---|
820 | sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, Nullch, 0); |
---|
821 | /* NOTE: No support for tied ISA */ |
---|
822 | if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA") |
---|
823 | && AvFILLp(av) == -1) |
---|
824 | { |
---|
825 | char *pname; |
---|
826 | av_push(av, newSVpvn(pname = "NDBM_File",9)); |
---|
827 | gv_stashpvn(pname, 9, TRUE); |
---|
828 | av_push(av, newSVpvn(pname = "DB_File",7)); |
---|
829 | gv_stashpvn(pname, 7, TRUE); |
---|
830 | av_push(av, newSVpvn(pname = "GDBM_File",9)); |
---|
831 | gv_stashpvn(pname, 9, TRUE); |
---|
832 | av_push(av, newSVpvn(pname = "SDBM_File",9)); |
---|
833 | gv_stashpvn(pname, 9, TRUE); |
---|
834 | av_push(av, newSVpvn(pname = "ODBM_File",9)); |
---|
835 | gv_stashpvn(pname, 9, TRUE); |
---|
836 | } |
---|
837 | } |
---|
838 | break; |
---|
839 | case 'O': |
---|
840 | if (strEQ(name, "OVERLOAD")) { |
---|
841 | HV* hv = GvHVn(gv); |
---|
842 | GvMULTI_on(gv); |
---|
843 | hv_magic(hv, Nullgv, PERL_MAGIC_overload); |
---|
844 | } |
---|
845 | break; |
---|
846 | case 'S': |
---|
847 | if (strEQ(name, "SIG")) { |
---|
848 | HV *hv; |
---|
849 | I32 i; |
---|
850 | if (!PL_psig_ptr) { |
---|
851 | Newz(73, PL_psig_ptr, SIG_SIZE, SV*); |
---|
852 | Newz(73, PL_psig_name, SIG_SIZE, SV*); |
---|
853 | Newz(73, PL_psig_pend, SIG_SIZE, int); |
---|
854 | } |
---|
855 | GvMULTI_on(gv); |
---|
856 | hv = GvHVn(gv); |
---|
857 | hv_magic(hv, Nullgv, PERL_MAGIC_sig); |
---|
858 | for (i = 1; i < SIG_SIZE; i++) { |
---|
859 | SV ** init; |
---|
860 | init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1); |
---|
861 | if (init) |
---|
862 | sv_setsv(*init, &PL_sv_undef); |
---|
863 | PL_psig_ptr[i] = 0; |
---|
864 | PL_psig_name[i] = 0; |
---|
865 | PL_psig_pend[i] = 0; |
---|
866 | } |
---|
867 | } |
---|
868 | break; |
---|
869 | case 'V': |
---|
870 | if (strEQ(name, "VERSION")) |
---|
871 | GvMULTI_on(gv); |
---|
872 | break; |
---|
873 | |
---|
874 | case '&': |
---|
875 | case '`': |
---|
876 | case '\'': |
---|
877 | if ( |
---|
878 | len > 1 || |
---|
879 | sv_type == SVt_PVAV || |
---|
880 | sv_type == SVt_PVHV || |
---|
881 | sv_type == SVt_PVCV || |
---|
882 | sv_type == SVt_PVFM || |
---|
883 | sv_type == SVt_PVIO |
---|
884 | ) { break; } |
---|
885 | PL_sawampersand = TRUE; |
---|
886 | goto ro_magicalize; |
---|
887 | |
---|
888 | case ':': |
---|
889 | if (len > 1) |
---|
890 | break; |
---|
891 | sv_setpv(GvSV(gv),PL_chopset); |
---|
892 | goto magicalize; |
---|
893 | |
---|
894 | case '?': |
---|
895 | if (len > 1) |
---|
896 | break; |
---|
897 | #ifdef COMPLEX_STATUS |
---|
898 | (void)SvUPGRADE(GvSV(gv), SVt_PVLV); |
---|
899 | #endif |
---|
900 | goto magicalize; |
---|
901 | |
---|
902 | case '!': |
---|
903 | if (len > 1) |
---|
904 | break; |
---|
905 | |
---|
906 | /* If %! has been used, automatically load Errno.pm. |
---|
907 | The require will itself set errno, so in order to |
---|
908 | preserve its value we have to set up the magic |
---|
909 | now (rather than going to magicalize) |
---|
910 | */ |
---|
911 | |
---|
912 | sv_magic(GvSV(gv), (SV*)gv, PERL_MAGIC_sv, name, len); |
---|
913 | |
---|
914 | if (sv_type == SVt_PVHV) |
---|
915 | require_errno(gv); |
---|
916 | |
---|
917 | break; |
---|
918 | case '-': |
---|
919 | if (len > 1) |
---|
920 | break; |
---|
921 | else { |
---|
922 | AV* av = GvAVn(gv); |
---|
923 | sv_magic((SV*)av, Nullsv, PERL_MAGIC_regdata, Nullch, 0); |
---|
924 | SvREADONLY_on(av); |
---|
925 | } |
---|
926 | goto magicalize; |
---|
927 | case '#': |
---|
928 | case '*': |
---|
929 | if (ckWARN2(WARN_DEPRECATED, WARN_SYNTAX) && len == 1 && sv_type == SVt_PV) |
---|
930 | Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX), "Use of $%s is deprecated", name); |
---|
931 | /* FALL THROUGH */ |
---|
932 | case '[': |
---|
933 | case '^': |
---|
934 | case '~': |
---|
935 | case '=': |
---|
936 | case '%': |
---|
937 | case '.': |
---|
938 | case '(': |
---|
939 | case ')': |
---|
940 | case '<': |
---|
941 | case '>': |
---|
942 | case ',': |
---|
943 | case '\\': |
---|
944 | case '/': |
---|
945 | case '\001': /* $^A */ |
---|
946 | case '\003': /* $^C */ |
---|
947 | case '\004': /* $^D */ |
---|
948 | case '\006': /* $^F */ |
---|
949 | case '\010': /* $^H */ |
---|
950 | case '\011': /* $^I, NOT \t in EBCDIC */ |
---|
951 | case '\016': /* $^N */ |
---|
952 | case '\020': /* $^P */ |
---|
953 | if (len > 1) |
---|
954 | break; |
---|
955 | goto magicalize; |
---|
956 | case '|': |
---|
957 | if (len > 1) |
---|
958 | break; |
---|
959 | sv_setiv(GvSV(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0); |
---|
960 | goto magicalize; |
---|
961 | case '\005': /* $^E && $^ENCODING */ |
---|
962 | if (len > 1 && strNE(name, "\005NCODING")) |
---|
963 | break; |
---|
964 | goto magicalize; |
---|
965 | |
---|
966 | case '\017': /* $^O & $^OPEN */ |
---|
967 | if (len > 1 && strNE(name, "\017PEN")) |
---|
968 | break; |
---|
969 | goto magicalize; |
---|
970 | case '\023': /* $^S */ |
---|
971 | if (len > 1) |
---|
972 | break; |
---|
973 | goto ro_magicalize; |
---|
974 | case '\024': /* $^T, ${^TAINT} */ |
---|
975 | if (len == 1) |
---|
976 | goto magicalize; |
---|
977 | else if (strEQ(name, "\024AINT")) |
---|
978 | goto ro_magicalize; |
---|
979 | else |
---|
980 | break; |
---|
981 | case '\027': /* $^W & $^WARNING_BITS */ |
---|
982 | if (len > 1 && strNE(name, "\027ARNING_BITS") |
---|
983 | && strNE(name, "\027IDE_SYSTEM_CALLS")) |
---|
984 | break; |
---|
985 | goto magicalize; |
---|
986 | |
---|
987 | case '+': |
---|
988 | if (len > 1) |
---|
989 | break; |
---|
990 | else { |
---|
991 | AV* av = GvAVn(gv); |
---|
992 | sv_magic((SV*)av, (SV*)av, PERL_MAGIC_regdata, Nullch, 0); |
---|
993 | SvREADONLY_on(av); |
---|
994 | } |
---|
995 | /* FALL THROUGH */ |
---|
996 | case '1': |
---|
997 | case '2': |
---|
998 | case '3': |
---|
999 | case '4': |
---|
1000 | case '5': |
---|
1001 | case '6': |
---|
1002 | case '7': |
---|
1003 | case '8': |
---|
1004 | case '9': |
---|
1005 | /* ensures variable is only digits */ |
---|
1006 | /* ${"1foo"} fails this test (and is thus writeable) */ |
---|
1007 | /* added by japhy, but borrowed from is_gv_magical */ |
---|
1008 | |
---|
1009 | if (len > 1) { |
---|
1010 | const char *end = name + len; |
---|
1011 | while (--end > name) { |
---|
1012 | if (!isDIGIT(*end)) return gv; |
---|
1013 | } |
---|
1014 | } |
---|
1015 | |
---|
1016 | ro_magicalize: |
---|
1017 | SvREADONLY_on(GvSV(gv)); |
---|
1018 | magicalize: |
---|
1019 | sv_magic(GvSV(gv), (SV*)gv, PERL_MAGIC_sv, name, len); |
---|
1020 | break; |
---|
1021 | |
---|
1022 | case '\014': /* $^L */ |
---|
1023 | if (len > 1) |
---|
1024 | break; |
---|
1025 | sv_setpv(GvSV(gv),"\f"); |
---|
1026 | PL_formfeed = GvSV(gv); |
---|
1027 | break; |
---|
1028 | case ';': |
---|
1029 | if (len > 1) |
---|
1030 | break; |
---|
1031 | sv_setpv(GvSV(gv),"\034"); |
---|
1032 | break; |
---|
1033 | case ']': |
---|
1034 | if (len == 1) { |
---|
1035 | SV *sv = GvSV(gv); |
---|
1036 | (void)SvUPGRADE(sv, SVt_PVNV); |
---|
1037 | Perl_sv_setpvf(aTHX_ sv, |
---|
1038 | #if defined(PERL_SUBVERSION) && (PERL_SUBVERSION > 0) |
---|
1039 | "%8.6" |
---|
1040 | #else |
---|
1041 | "%5.3" |
---|
1042 | #endif |
---|
1043 | NVff, |
---|
1044 | SvNVX(PL_patchlevel)); |
---|
1045 | SvNVX(sv) = SvNVX(PL_patchlevel); |
---|
1046 | SvNOK_on(sv); |
---|
1047 | SvREADONLY_on(sv); |
---|
1048 | } |
---|
1049 | break; |
---|
1050 | case '\026': /* $^V */ |
---|
1051 | if (len == 1) { |
---|
1052 | SV *sv = GvSV(gv); |
---|
1053 | GvSV(gv) = SvREFCNT_inc(PL_patchlevel); |
---|
1054 | SvREFCNT_dec(sv); |
---|
1055 | } |
---|
1056 | break; |
---|
1057 | } |
---|
1058 | return gv; |
---|
1059 | } |
---|
1060 | |
---|
1061 | void |
---|
1062 | Perl_gv_fullname4(pTHX_ SV *sv, GV *gv, const char *prefix, bool keepmain) |
---|
1063 | { |
---|
1064 | HV *hv = GvSTASH(gv); |
---|
1065 | if (!hv) { |
---|
1066 | (void)SvOK_off(sv); |
---|
1067 | return; |
---|
1068 | } |
---|
1069 | sv_setpv(sv, prefix ? prefix : ""); |
---|
1070 | if (keepmain || strNE(HvNAME(hv), "main")) { |
---|
1071 | sv_catpv(sv,HvNAME(hv)); |
---|
1072 | sv_catpvn(sv,"::", 2); |
---|
1073 | } |
---|
1074 | sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv)); |
---|
1075 | } |
---|
1076 | |
---|
1077 | void |
---|
1078 | Perl_gv_fullname3(pTHX_ SV *sv, GV *gv, const char *prefix) |
---|
1079 | { |
---|
1080 | HV *hv = GvSTASH(gv); |
---|
1081 | if (!hv) { |
---|
1082 | (void)SvOK_off(sv); |
---|
1083 | return; |
---|
1084 | } |
---|
1085 | sv_setpv(sv, prefix ? prefix : ""); |
---|
1086 | sv_catpv(sv,HvNAME(hv)); |
---|
1087 | sv_catpvn(sv,"::", 2); |
---|
1088 | sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv)); |
---|
1089 | } |
---|
1090 | |
---|
1091 | void |
---|
1092 | Perl_gv_efullname4(pTHX_ SV *sv, GV *gv, const char *prefix, bool keepmain) |
---|
1093 | { |
---|
1094 | GV *egv = GvEGV(gv); |
---|
1095 | if (!egv) |
---|
1096 | egv = gv; |
---|
1097 | gv_fullname4(sv, egv, prefix, keepmain); |
---|
1098 | } |
---|
1099 | |
---|
1100 | void |
---|
1101 | Perl_gv_efullname3(pTHX_ SV *sv, GV *gv, const char *prefix) |
---|
1102 | { |
---|
1103 | GV *egv = GvEGV(gv); |
---|
1104 | if (!egv) |
---|
1105 | egv = gv; |
---|
1106 | gv_fullname3(sv, egv, prefix); |
---|
1107 | } |
---|
1108 | |
---|
1109 | /* XXX compatibility with versions <= 5.003. */ |
---|
1110 | void |
---|
1111 | Perl_gv_fullname(pTHX_ SV *sv, GV *gv) |
---|
1112 | { |
---|
1113 | gv_fullname3(sv, gv, sv == (SV*)gv ? "*" : ""); |
---|
1114 | } |
---|
1115 | |
---|
1116 | /* XXX compatibility with versions <= 5.003. */ |
---|
1117 | void |
---|
1118 | Perl_gv_efullname(pTHX_ SV *sv, GV *gv) |
---|
1119 | { |
---|
1120 | gv_efullname3(sv, gv, sv == (SV*)gv ? "*" : ""); |
---|
1121 | } |
---|
1122 | |
---|
1123 | IO * |
---|
1124 | Perl_newIO(pTHX) |
---|
1125 | { |
---|
1126 | IO *io; |
---|
1127 | GV *iogv; |
---|
1128 | |
---|
1129 | io = (IO*)NEWSV(0,0); |
---|
1130 | sv_upgrade((SV *)io,SVt_PVIO); |
---|
1131 | SvREFCNT(io) = 1; |
---|
1132 | SvOBJECT_on(io); |
---|
1133 | iogv = gv_fetchpv("FileHandle::", FALSE, SVt_PVHV); |
---|
1134 | /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */ |
---|
1135 | if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv)))) |
---|
1136 | iogv = gv_fetchpv("IO::Handle::", TRUE, SVt_PVHV); |
---|
1137 | SvSTASH(io) = (HV*)SvREFCNT_inc(GvHV(iogv)); |
---|
1138 | return io; |
---|
1139 | } |
---|
1140 | |
---|
1141 | void |
---|
1142 | Perl_gv_check(pTHX_ HV *stash) |
---|
1143 | { |
---|
1144 | register HE *entry; |
---|
1145 | register I32 i; |
---|
1146 | register GV *gv; |
---|
1147 | HV *hv; |
---|
1148 | |
---|
1149 | if (!HvARRAY(stash)) |
---|
1150 | return; |
---|
1151 | for (i = 0; i <= (I32) HvMAX(stash); i++) { |
---|
1152 | for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) { |
---|
1153 | if (HeKEY(entry)[HeKLEN(entry)-1] == ':' && |
---|
1154 | (gv = (GV*)HeVAL(entry)) && (hv = GvHV(gv))) |
---|
1155 | { |
---|
1156 | if (hv != PL_defstash && hv != stash) |
---|
1157 | gv_check(hv); /* nested package */ |
---|
1158 | } |
---|
1159 | else if (isALPHA(*HeKEY(entry))) { |
---|
1160 | char *file; |
---|
1161 | gv = (GV*)HeVAL(entry); |
---|
1162 | if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv)) |
---|
1163 | continue; |
---|
1164 | file = GvFILE(gv); |
---|
1165 | /* performance hack: if filename is absolute and it's a standard |
---|
1166 | * module, don't bother warning */ |
---|
1167 | if (file |
---|
1168 | && PERL_FILE_IS_ABSOLUTE(file) |
---|
1169 | #ifdef MACOS_TRADITIONAL |
---|
1170 | && (instr(file, ":lib:") |
---|
1171 | #else |
---|
1172 | && (instr(file, "/lib/") |
---|
1173 | #endif |
---|
1174 | || instr(file, ".pm"))) |
---|
1175 | { |
---|
1176 | continue; |
---|
1177 | } |
---|
1178 | CopLINE_set(PL_curcop, GvLINE(gv)); |
---|
1179 | #ifdef USE_ITHREADS |
---|
1180 | CopFILE(PL_curcop) = file; /* set for warning */ |
---|
1181 | #else |
---|
1182 | CopFILEGV(PL_curcop) = gv_fetchfile(file); |
---|
1183 | #endif |
---|
1184 | Perl_warner(aTHX_ packWARN(WARN_ONCE), |
---|
1185 | "Name \"%s::%s\" used only once: possible typo", |
---|
1186 | HvNAME(stash), GvNAME(gv)); |
---|
1187 | } |
---|
1188 | } |
---|
1189 | } |
---|
1190 | } |
---|
1191 | |
---|
1192 | GV * |
---|
1193 | Perl_newGVgen(pTHX_ char *pack) |
---|
1194 | { |
---|
1195 | return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++), |
---|
1196 | TRUE, SVt_PVGV); |
---|
1197 | } |
---|
1198 | |
---|
1199 | /* hopefully this is only called on local symbol table entries */ |
---|
1200 | |
---|
1201 | GP* |
---|
1202 | Perl_gp_ref(pTHX_ GP *gp) |
---|
1203 | { |
---|
1204 | if (!gp) |
---|
1205 | return (GP*)NULL; |
---|
1206 | gp->gp_refcnt++; |
---|
1207 | if (gp->gp_cv) { |
---|
1208 | if (gp->gp_cvgen) { |
---|
1209 | /* multi-named GPs cannot be used for method cache */ |
---|
1210 | SvREFCNT_dec(gp->gp_cv); |
---|
1211 | gp->gp_cv = Nullcv; |
---|
1212 | gp->gp_cvgen = 0; |
---|
1213 | } |
---|
1214 | else { |
---|
1215 | /* Adding a new name to a subroutine invalidates method cache */ |
---|
1216 | PL_sub_generation++; |
---|
1217 | } |
---|
1218 | } |
---|
1219 | return gp; |
---|
1220 | } |
---|
1221 | |
---|
1222 | void |
---|
1223 | Perl_gp_free(pTHX_ GV *gv) |
---|
1224 | { |
---|
1225 | GP* gp; |
---|
1226 | |
---|
1227 | if (!gv || !(gp = GvGP(gv))) |
---|
1228 | return; |
---|
1229 | if (gp->gp_refcnt == 0) { |
---|
1230 | if (ckWARN_d(WARN_INTERNAL)) |
---|
1231 | Perl_warner(aTHX_ packWARN(WARN_INTERNAL), |
---|
1232 | "Attempt to free unreferenced glob pointers"); |
---|
1233 | return; |
---|
1234 | } |
---|
1235 | if (gp->gp_cv) { |
---|
1236 | /* Deleting the name of a subroutine invalidates method cache */ |
---|
1237 | PL_sub_generation++; |
---|
1238 | } |
---|
1239 | if (--gp->gp_refcnt > 0) { |
---|
1240 | if (gp->gp_egv == gv) |
---|
1241 | gp->gp_egv = 0; |
---|
1242 | return; |
---|
1243 | } |
---|
1244 | |
---|
1245 | SvREFCNT_dec(gp->gp_sv); |
---|
1246 | SvREFCNT_dec(gp->gp_av); |
---|
1247 | SvREFCNT_dec(gp->gp_hv); |
---|
1248 | SvREFCNT_dec(gp->gp_io); |
---|
1249 | SvREFCNT_dec(gp->gp_cv); |
---|
1250 | SvREFCNT_dec(gp->gp_form); |
---|
1251 | |
---|
1252 | Safefree(gp); |
---|
1253 | GvGP(gv) = 0; |
---|
1254 | } |
---|
1255 | |
---|
1256 | int |
---|
1257 | Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg) |
---|
1258 | { |
---|
1259 | AMT *amtp = (AMT*)mg->mg_ptr; |
---|
1260 | if (amtp && AMT_AMAGIC(amtp)) { |
---|
1261 | int i; |
---|
1262 | for (i = 1; i < NofAMmeth; i++) { |
---|
1263 | CV *cv = amtp->table[i]; |
---|
1264 | if (cv != Nullcv) { |
---|
1265 | SvREFCNT_dec((SV *) cv); |
---|
1266 | amtp->table[i] = Nullcv; |
---|
1267 | } |
---|
1268 | } |
---|
1269 | } |
---|
1270 | return 0; |
---|
1271 | } |
---|
1272 | |
---|
1273 | /* Updates and caches the CV's */ |
---|
1274 | |
---|
1275 | bool |
---|
1276 | Perl_Gv_AMupdate(pTHX_ HV *stash) |
---|
1277 | { |
---|
1278 | GV* gv; |
---|
1279 | CV* cv; |
---|
1280 | MAGIC* mg=mg_find((SV*)stash, PERL_MAGIC_overload_table); |
---|
1281 | AMT *amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL; |
---|
1282 | AMT amt; |
---|
1283 | |
---|
1284 | if (mg && amtp->was_ok_am == PL_amagic_generation |
---|
1285 | && amtp->was_ok_sub == PL_sub_generation) |
---|
1286 | return (bool)AMT_OVERLOADED(amtp); |
---|
1287 | sv_unmagic((SV*)stash, PERL_MAGIC_overload_table); |
---|
1288 | |
---|
1289 | DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME(stash)) ); |
---|
1290 | |
---|
1291 | Zero(&amt,1,AMT); |
---|
1292 | amt.was_ok_am = PL_amagic_generation; |
---|
1293 | amt.was_ok_sub = PL_sub_generation; |
---|
1294 | amt.fallback = AMGfallNO; |
---|
1295 | amt.flags = 0; |
---|
1296 | |
---|
1297 | { |
---|
1298 | int filled = 0, have_ovl = 0; |
---|
1299 | int i, lim = 1; |
---|
1300 | SV* sv = NULL; |
---|
1301 | |
---|
1302 | /* Work with "fallback" key, which we assume to be first in PL_AMG_names */ |
---|
1303 | |
---|
1304 | /* Try to find via inheritance. */ |
---|
1305 | gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1); |
---|
1306 | if (gv) |
---|
1307 | sv = GvSV(gv); |
---|
1308 | |
---|
1309 | if (!gv) |
---|
1310 | lim = DESTROY_amg; /* Skip overloading entries. */ |
---|
1311 | else if (SvTRUE(sv)) |
---|
1312 | amt.fallback=AMGfallYES; |
---|
1313 | else if (SvOK(sv)) |
---|
1314 | amt.fallback=AMGfallNEVER; |
---|
1315 | |
---|
1316 | for (i = 1; i < lim; i++) |
---|
1317 | amt.table[i] = Nullcv; |
---|
1318 | for (; i < NofAMmeth; i++) { |
---|
1319 | char *cooky = (char*)PL_AMG_names[i]; |
---|
1320 | /* Human-readable form, for debugging: */ |
---|
1321 | char *cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i)); |
---|
1322 | STRLEN l = strlen(cooky); |
---|
1323 | |
---|
1324 | DEBUG_o( Perl_deb(aTHX_ "Checking overloading of `%s' in package `%.256s'\n", |
---|
1325 | cp, HvNAME(stash)) ); |
---|
1326 | /* don't fill the cache while looking up! |
---|
1327 | Creation of inheritance stubs in intermediate packages may |
---|
1328 | conflict with the logic of runtime method substitution. |
---|
1329 | Indeed, for inheritance A -> B -> C, if C overloads "+0", |
---|
1330 | then we could have created stubs for "(+0" in A and C too. |
---|
1331 | But if B overloads "bool", we may want to use it for |
---|
1332 | numifying instead of C's "+0". */ |
---|
1333 | if (i >= DESTROY_amg) |
---|
1334 | gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0); |
---|
1335 | else /* Autoload taken care of below */ |
---|
1336 | gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1); |
---|
1337 | cv = 0; |
---|
1338 | if (gv && (cv = GvCV(gv))) { |
---|
1339 | if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil") |
---|
1340 | && strEQ(HvNAME(GvSTASH(CvGV(cv))), "overload")) { |
---|
1341 | /* This is a hack to support autoloading..., while |
---|
1342 | knowing *which* methods were declared as overloaded. */ |
---|
1343 | /* GvSV contains the name of the method. */ |
---|
1344 | GV *ngv = Nullgv; |
---|
1345 | |
---|
1346 | DEBUG_o( Perl_deb(aTHX_ "Resolving method `%.256s' for overloaded `%s' in package `%.256s'\n", |
---|
1347 | SvPV_nolen(GvSV(gv)), cp, HvNAME(stash)) ); |
---|
1348 | if (!SvPOK(GvSV(gv)) |
---|
1349 | || !(ngv = gv_fetchmethod_autoload(stash, SvPVX(GvSV(gv)), |
---|
1350 | FALSE))) |
---|
1351 | { |
---|
1352 | /* Can be an import stub (created by `can'). */ |
---|
1353 | if (GvCVGEN(gv)) { |
---|
1354 | Perl_croak(aTHX_ "Stub found while resolving method `%.256s' overloading `%s' in package `%.256s'", |
---|
1355 | (SvPOK(GvSV(gv)) ? SvPVX(GvSV(gv)) : "???" ), |
---|
1356 | cp, HvNAME(stash)); |
---|
1357 | } else |
---|
1358 | Perl_croak(aTHX_ "Can't resolve method `%.256s' overloading `%s' in package `%.256s'", |
---|
1359 | (SvPOK(GvSV(gv)) ? SvPVX(GvSV(gv)) : "???" ), |
---|
1360 | cp, HvNAME(stash)); |
---|
1361 | } |
---|
1362 | cv = GvCV(gv = ngv); |
---|
1363 | } |
---|
1364 | DEBUG_o( Perl_deb(aTHX_ "Overloading `%s' in package `%.256s' via `%.256s::%.256s' \n", |
---|
1365 | cp, HvNAME(stash), HvNAME(GvSTASH(CvGV(cv))), |
---|
1366 | GvNAME(CvGV(cv))) ); |
---|
1367 | filled = 1; |
---|
1368 | if (i < DESTROY_amg) |
---|
1369 | have_ovl = 1; |
---|
1370 | } else if (gv) { /* Autoloaded... */ |
---|
1371 | cv = (CV*)gv; |
---|
1372 | filled = 1; |
---|
1373 | } |
---|
1374 | amt.table[i]=(CV*)SvREFCNT_inc(cv); |
---|
1375 | } |
---|
1376 | if (filled) { |
---|
1377 | AMT_AMAGIC_on(&amt); |
---|
1378 | if (have_ovl) |
---|
1379 | AMT_OVERLOADED_on(&amt); |
---|
1380 | sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table, |
---|
1381 | (char*)&amt, sizeof(AMT)); |
---|
1382 | return have_ovl; |
---|
1383 | } |
---|
1384 | } |
---|
1385 | /* Here we have no table: */ |
---|
1386 | /* no_table: */ |
---|
1387 | AMT_AMAGIC_off(&amt); |
---|
1388 | sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table, |
---|
1389 | (char*)&amt, sizeof(AMTS)); |
---|
1390 | return FALSE; |
---|
1391 | } |
---|
1392 | |
---|
1393 | |
---|
1394 | CV* |
---|
1395 | Perl_gv_handler(pTHX_ HV *stash, I32 id) |
---|
1396 | { |
---|
1397 | MAGIC *mg; |
---|
1398 | AMT *amtp; |
---|
1399 | CV *ret; |
---|
1400 | |
---|
1401 | if (!stash) |
---|
1402 | return Nullcv; |
---|
1403 | mg = mg_find((SV*)stash, PERL_MAGIC_overload_table); |
---|
1404 | if (!mg) { |
---|
1405 | do_update: |
---|
1406 | Gv_AMupdate(stash); |
---|
1407 | mg = mg_find((SV*)stash, PERL_MAGIC_overload_table); |
---|
1408 | } |
---|
1409 | amtp = (AMT*)mg->mg_ptr; |
---|
1410 | if ( amtp->was_ok_am != PL_amagic_generation |
---|
1411 | || amtp->was_ok_sub != PL_sub_generation ) |
---|
1412 | goto do_update; |
---|
1413 | if (AMT_AMAGIC(amtp)) { |
---|
1414 | ret = amtp->table[id]; |
---|
1415 | if (ret && isGV(ret)) { /* Autoloading stab */ |
---|
1416 | /* Passing it through may have resulted in a warning |
---|
1417 | "Inherited AUTOLOAD for a non-method deprecated", since |
---|
1418 | our caller is going through a function call, not a method call. |
---|
1419 | So return the CV for AUTOLOAD, setting $AUTOLOAD. */ |
---|
1420 | GV *gv = gv_fetchmethod(stash, (char*)PL_AMG_names[id]); |
---|
1421 | |
---|
1422 | if (gv && GvCV(gv)) |
---|
1423 | return GvCV(gv); |
---|
1424 | } |
---|
1425 | return ret; |
---|
1426 | } |
---|
1427 | |
---|
1428 | return Nullcv; |
---|
1429 | } |
---|
1430 | |
---|
1431 | |
---|
1432 | SV* |
---|
1433 | Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags) |
---|
1434 | { |
---|
1435 | MAGIC *mg; |
---|
1436 | CV *cv=NULL; |
---|
1437 | CV **cvp=NULL, **ocvp=NULL; |
---|
1438 | AMT *amtp=NULL, *oamtp=NULL; |
---|
1439 | int off=0, off1, lr=0, assign=AMGf_assign & flags, notfound=0; |
---|
1440 | int postpr = 0, force_cpy = 0, assignshift = assign ? 1 : 0; |
---|
1441 | #ifdef DEBUGGING |
---|
1442 | int fl=0; |
---|
1443 | #endif |
---|
1444 | HV* stash=NULL; |
---|
1445 | if (!(AMGf_noleft & flags) && SvAMAGIC(left) |
---|
1446 | && (stash = SvSTASH(SvRV(left))) |
---|
1447 | && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table)) |
---|
1448 | && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr) |
---|
1449 | ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table |
---|
1450 | : (CV **) NULL)) |
---|
1451 | && ((cv = cvp[off=method+assignshift]) |
---|
1452 | || (assign && amtp->fallback > AMGfallNEVER && /* fallback to |
---|
1453 | * usual method */ |
---|
1454 | ( |
---|
1455 | #ifdef DEBUGGING |
---|
1456 | fl = 1, |
---|
1457 | #endif |
---|
1458 | cv = cvp[off=method])))) { |
---|
1459 | lr = -1; /* Call method for left argument */ |
---|
1460 | } else { |
---|
1461 | if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) { |
---|
1462 | int logic; |
---|
1463 | |
---|
1464 | /* look for substituted methods */ |
---|
1465 | /* In all the covered cases we should be called with assign==0. */ |
---|
1466 | switch (method) { |
---|
1467 | case inc_amg: |
---|
1468 | force_cpy = 1; |
---|
1469 | if ((cv = cvp[off=add_ass_amg]) |
---|
1470 | || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) { |
---|
1471 | right = &PL_sv_yes; lr = -1; assign = 1; |
---|
1472 | } |
---|
1473 | break; |
---|
1474 | case dec_amg: |
---|
1475 | force_cpy = 1; |
---|
1476 | if ((cv = cvp[off = subtr_ass_amg]) |
---|
1477 | || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) { |
---|
1478 | right = &PL_sv_yes; lr = -1; assign = 1; |
---|
1479 | } |
---|
1480 | break; |
---|
1481 | case bool__amg: |
---|
1482 | (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg])); |
---|
1483 | break; |
---|
1484 | case numer_amg: |
---|
1485 | (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg])); |
---|
1486 | break; |
---|
1487 | case string_amg: |
---|
1488 | (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg])); |
---|
1489 | break; |
---|
1490 | case not_amg: |
---|
1491 | (void)((cv = cvp[off=bool__amg]) |
---|
1492 | || (cv = cvp[off=numer_amg]) |
---|
1493 | || (cv = cvp[off=string_amg])); |
---|
1494 | postpr = 1; |
---|
1495 | break; |
---|
1496 | case copy_amg: |
---|
1497 | { |
---|
1498 | /* |
---|
1499 | * SV* ref causes confusion with the interpreter variable of |
---|
1500 | * the same name |
---|
1501 | */ |
---|
1502 | SV* tmpRef=SvRV(left); |
---|
1503 | if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) { |
---|
1504 | /* |
---|
1505 | * Just to be extra cautious. Maybe in some |
---|
1506 | * additional cases sv_setsv is safe, too. |
---|
1507 | */ |
---|
1508 | SV* newref = newSVsv(tmpRef); |
---|
1509 | SvOBJECT_on(newref); |
---|
1510 | SvSTASH(newref) = (HV*)SvREFCNT_inc(SvSTASH(tmpRef)); |
---|
1511 | return newref; |
---|
1512 | } |
---|
1513 | } |
---|
1514 | break; |
---|
1515 | case abs_amg: |
---|
1516 | if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg]) |
---|
1517 | && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) { |
---|
1518 | SV* nullsv=sv_2mortal(newSViv(0)); |
---|
1519 | if (off1==lt_amg) { |
---|
1520 | SV* lessp = amagic_call(left,nullsv, |
---|
1521 | lt_amg,AMGf_noright); |
---|
1522 | logic = SvTRUE(lessp); |
---|
1523 | } else { |
---|
1524 | SV* lessp = amagic_call(left,nullsv, |
---|
1525 | ncmp_amg,AMGf_noright); |
---|
1526 | logic = (SvNV(lessp) < 0); |
---|
1527 | } |
---|
1528 | if (logic) { |
---|
1529 | if (off==subtr_amg) { |
---|
1530 | right = left; |
---|
1531 | left = nullsv; |
---|
1532 | lr = 1; |
---|
1533 | } |
---|
1534 | } else { |
---|
1535 | return left; |
---|
1536 | } |
---|
1537 | } |
---|
1538 | break; |
---|
1539 | case neg_amg: |
---|
1540 | if ((cv = cvp[off=subtr_amg])) { |
---|
1541 | right = left; |
---|
1542 | left = sv_2mortal(newSViv(0)); |
---|
1543 | lr = 1; |
---|
1544 | } |
---|
1545 | break; |
---|
1546 | case int_amg: |
---|
1547 | case iter_amg: /* XXXX Eventually should do to_gv. */ |
---|
1548 | /* FAIL safe */ |
---|
1549 | return NULL; /* Delegate operation to standard mechanisms. */ |
---|
1550 | break; |
---|
1551 | case to_sv_amg: |
---|
1552 | case to_av_amg: |
---|
1553 | case to_hv_amg: |
---|
1554 | case to_gv_amg: |
---|
1555 | case to_cv_amg: |
---|
1556 | /* FAIL safe */ |
---|
1557 | return left; /* Delegate operation to standard mechanisms. */ |
---|
1558 | break; |
---|
1559 | default: |
---|
1560 | goto not_found; |
---|
1561 | } |
---|
1562 | if (!cv) goto not_found; |
---|
1563 | } else if (!(AMGf_noright & flags) && SvAMAGIC(right) |
---|
1564 | && (stash = SvSTASH(SvRV(right))) |
---|
1565 | && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table)) |
---|
1566 | && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr) |
---|
1567 | ? (amtp = (AMT*)mg->mg_ptr)->table |
---|
1568 | : (CV **) NULL)) |
---|
1569 | && (cv = cvp[off=method])) { /* Method for right |
---|
1570 | * argument found */ |
---|
1571 | lr=1; |
---|
1572 | } else if (((ocvp && oamtp->fallback > AMGfallNEVER |
---|
1573 | && (cvp=ocvp) && (lr = -1)) |
---|
1574 | || (cvp && amtp->fallback > AMGfallNEVER && (lr=1))) |
---|
1575 | && !(flags & AMGf_unary)) { |
---|
1576 | /* We look for substitution for |
---|
1577 | * comparison operations and |
---|
1578 | * concatenation */ |
---|
1579 | if (method==concat_amg || method==concat_ass_amg |
---|
1580 | || method==repeat_amg || method==repeat_ass_amg) { |
---|
1581 | return NULL; /* Delegate operation to string conversion */ |
---|
1582 | } |
---|
1583 | off = -1; |
---|
1584 | switch (method) { |
---|
1585 | case lt_amg: |
---|
1586 | case le_amg: |
---|
1587 | case gt_amg: |
---|
1588 | case ge_amg: |
---|
1589 | case eq_amg: |
---|
1590 | case ne_amg: |
---|
1591 | postpr = 1; off=ncmp_amg; break; |
---|
1592 | case slt_amg: |
---|
1593 | case sle_amg: |
---|
1594 | case sgt_amg: |
---|
1595 | case sge_amg: |
---|
1596 | case seq_amg: |
---|
1597 | case sne_amg: |
---|
1598 | postpr = 1; off=scmp_amg; break; |
---|
1599 | } |
---|
1600 | if (off != -1) cv = cvp[off]; |
---|
1601 | if (!cv) { |
---|
1602 | goto not_found; |
---|
1603 | } |
---|
1604 | } else { |
---|
1605 | not_found: /* No method found, either report or croak */ |
---|
1606 | switch (method) { |
---|
1607 | case to_sv_amg: |
---|
1608 | case to_av_amg: |
---|
1609 | case to_hv_amg: |
---|
1610 | case to_gv_amg: |
---|
1611 | case to_cv_amg: |
---|
1612 | /* FAIL safe */ |
---|
1613 | return left; /* Delegate operation to standard mechanisms. */ |
---|
1614 | break; |
---|
1615 | } |
---|
1616 | if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */ |
---|
1617 | notfound = 1; lr = -1; |
---|
1618 | } else if (cvp && (cv=cvp[nomethod_amg])) { |
---|
1619 | notfound = 1; lr = 1; |
---|
1620 | } else { |
---|
1621 | SV *msg; |
---|
1622 | if (off==-1) off=method; |
---|
1623 | msg = sv_2mortal(Perl_newSVpvf(aTHX_ |
---|
1624 | "Operation `%s': no method found,%sargument %s%s%s%s", |
---|
1625 | AMG_id2name(method + assignshift), |
---|
1626 | (flags & AMGf_unary ? " " : "\n\tleft "), |
---|
1627 | SvAMAGIC(left)? |
---|
1628 | "in overloaded package ": |
---|
1629 | "has no overloaded magic", |
---|
1630 | SvAMAGIC(left)? |
---|
1631 | HvNAME(SvSTASH(SvRV(left))): |
---|
1632 | "", |
---|
1633 | SvAMAGIC(right)? |
---|
1634 | ",\n\tright argument in overloaded package ": |
---|
1635 | (flags & AMGf_unary |
---|
1636 | ? "" |
---|
1637 | : ",\n\tright argument has no overloaded magic"), |
---|
1638 | SvAMAGIC(right)? |
---|
1639 | HvNAME(SvSTASH(SvRV(right))): |
---|
1640 | "")); |
---|
1641 | if (amtp && amtp->fallback >= AMGfallYES) { |
---|
1642 | DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX(msg)) ); |
---|
1643 | } else { |
---|
1644 | Perl_croak(aTHX_ "%"SVf, msg); |
---|
1645 | } |
---|
1646 | return NULL; |
---|
1647 | } |
---|
1648 | force_cpy = force_cpy || assign; |
---|
1649 | } |
---|
1650 | } |
---|
1651 | #ifdef DEBUGGING |
---|
1652 | if (!notfound) { |
---|
1653 | DEBUG_o(Perl_deb(aTHX_ |
---|
1654 | "Overloaded operator `%s'%s%s%s:\n\tmethod%s found%s in package %s%s\n", |
---|
1655 | AMG_id2name(off), |
---|
1656 | method+assignshift==off? "" : |
---|
1657 | " (initially `", |
---|
1658 | method+assignshift==off? "" : |
---|
1659 | AMG_id2name(method+assignshift), |
---|
1660 | method+assignshift==off? "" : "')", |
---|
1661 | flags & AMGf_unary? "" : |
---|
1662 | lr==1 ? " for right argument": " for left argument", |
---|
1663 | flags & AMGf_unary? " for argument" : "", |
---|
1664 | stash ? HvNAME(stash) : "null", |
---|
1665 | fl? ",\n\tassignment variant used": "") ); |
---|
1666 | } |
---|
1667 | #endif |
---|
1668 | /* Since we use shallow copy during assignment, we need |
---|
1669 | * to dublicate the contents, probably calling user-supplied |
---|
1670 | * version of copy operator |
---|
1671 | */ |
---|
1672 | /* We need to copy in following cases: |
---|
1673 | * a) Assignment form was called. |
---|
1674 | * assignshift==1, assign==T, method + 1 == off |
---|
1675 | * b) Increment or decrement, called directly. |
---|
1676 | * assignshift==0, assign==0, method + 0 == off |
---|
1677 | * c) Increment or decrement, translated to assignment add/subtr. |
---|
1678 | * assignshift==0, assign==T, |
---|
1679 | * force_cpy == T |
---|
1680 | * d) Increment or decrement, translated to nomethod. |
---|
1681 | * assignshift==0, assign==0, |
---|
1682 | * force_cpy == T |
---|
1683 | * e) Assignment form translated to nomethod. |
---|
1684 | * assignshift==1, assign==T, method + 1 != off |
---|
1685 | * force_cpy == T |
---|
1686 | */ |
---|
1687 | /* off is method, method+assignshift, or a result of opcode substitution. |
---|
1688 | * In the latter case assignshift==0, so only notfound case is important. |
---|
1689 | */ |
---|
1690 | if (( (method + assignshift == off) |
---|
1691 | && (assign || (method == inc_amg) || (method == dec_amg))) |
---|
1692 | || force_cpy) |
---|
1693 | RvDEEPCP(left); |
---|
1694 | { |
---|
1695 | dSP; |
---|
1696 | BINOP myop; |
---|
1697 | SV* res; |
---|
1698 | bool oldcatch = CATCH_GET; |
---|
1699 | |
---|
1700 | CATCH_SET(TRUE); |
---|
1701 | Zero(&myop, 1, BINOP); |
---|
1702 | myop.op_last = (OP *) &myop; |
---|
1703 | myop.op_next = Nullop; |
---|
1704 | myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED; |
---|
1705 | |
---|
1706 | PUSHSTACKi(PERLSI_OVERLOAD); |
---|
1707 | ENTER; |
---|
1708 | SAVEOP(); |
---|
1709 | PL_op = (OP *) &myop; |
---|
1710 | if (PERLDB_SUB && PL_curstash != PL_debstash) |
---|
1711 | PL_op->op_private |= OPpENTERSUB_DB; |
---|
1712 | PUTBACK; |
---|
1713 | pp_pushmark(); |
---|
1714 | |
---|
1715 | EXTEND(SP, notfound + 5); |
---|
1716 | PUSHs(lr>0? right: left); |
---|
1717 | PUSHs(lr>0? left: right); |
---|
1718 | PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no )); |
---|
1719 | if (notfound) { |
---|
1720 | PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0))); |
---|
1721 | } |
---|
1722 | PUSHs((SV*)cv); |
---|
1723 | PUTBACK; |
---|
1724 | |
---|
1725 | if ((PL_op = Perl_pp_entersub(aTHX))) |
---|
1726 | CALLRUNOPS(aTHX); |
---|
1727 | LEAVE; |
---|
1728 | SPAGAIN; |
---|
1729 | |
---|
1730 | res=POPs; |
---|
1731 | PUTBACK; |
---|
1732 | POPSTACK; |
---|
1733 | CATCH_SET(oldcatch); |
---|
1734 | |
---|
1735 | if (postpr) { |
---|
1736 | int ans=0; |
---|
1737 | switch (method) { |
---|
1738 | case le_amg: |
---|
1739 | case sle_amg: |
---|
1740 | ans=SvIV(res)<=0; break; |
---|
1741 | case lt_amg: |
---|
1742 | case slt_amg: |
---|
1743 | ans=SvIV(res)<0; break; |
---|
1744 | case ge_amg: |
---|
1745 | case sge_amg: |
---|
1746 | ans=SvIV(res)>=0; break; |
---|
1747 | case gt_amg: |
---|
1748 | case sgt_amg: |
---|
1749 | ans=SvIV(res)>0; break; |
---|
1750 | case eq_amg: |
---|
1751 | case seq_amg: |
---|
1752 | ans=SvIV(res)==0; break; |
---|
1753 | case ne_amg: |
---|
1754 | case sne_amg: |
---|
1755 | ans=SvIV(res)!=0; break; |
---|
1756 | case inc_amg: |
---|
1757 | case dec_amg: |
---|
1758 | SvSetSV(left,res); return left; |
---|
1759 | case not_amg: |
---|
1760 | ans=!SvTRUE(res); break; |
---|
1761 | } |
---|
1762 | return boolSV(ans); |
---|
1763 | } else if (method==copy_amg) { |
---|
1764 | if (!SvROK(res)) { |
---|
1765 | Perl_croak(aTHX_ "Copy method did not return a reference"); |
---|
1766 | } |
---|
1767 | return SvREFCNT_inc(SvRV(res)); |
---|
1768 | } else { |
---|
1769 | return res; |
---|
1770 | } |
---|
1771 | } |
---|
1772 | } |
---|
1773 | |
---|
1774 | /* |
---|
1775 | =for apidoc is_gv_magical |
---|
1776 | |
---|
1777 | Returns C<TRUE> if given the name of a magical GV. |
---|
1778 | |
---|
1779 | Currently only useful internally when determining if a GV should be |
---|
1780 | created even in rvalue contexts. |
---|
1781 | |
---|
1782 | C<flags> is not used at present but available for future extension to |
---|
1783 | allow selecting particular classes of magical variable. |
---|
1784 | |
---|
1785 | =cut |
---|
1786 | */ |
---|
1787 | bool |
---|
1788 | Perl_is_gv_magical(pTHX_ char *name, STRLEN len, U32 flags) |
---|
1789 | { |
---|
1790 | if (!len) |
---|
1791 | return FALSE; |
---|
1792 | |
---|
1793 | switch (*name) { |
---|
1794 | case 'I': |
---|
1795 | if (len == 3 && strEQ(name, "ISA")) |
---|
1796 | goto yes; |
---|
1797 | break; |
---|
1798 | case 'O': |
---|
1799 | if (len == 8 && strEQ(name, "OVERLOAD")) |
---|
1800 | goto yes; |
---|
1801 | break; |
---|
1802 | case 'S': |
---|
1803 | if (len == 3 && strEQ(name, "SIG")) |
---|
1804 | goto yes; |
---|
1805 | break; |
---|
1806 | case '\017': /* $^O & $^OPEN */ |
---|
1807 | if (len == 1 |
---|
1808 | || (len == 4 && strEQ(name, "\017PEN"))) |
---|
1809 | { |
---|
1810 | goto yes; |
---|
1811 | } |
---|
1812 | break; |
---|
1813 | case '\027': /* $^W & $^WARNING_BITS */ |
---|
1814 | if (len == 1 |
---|
1815 | || (len == 12 && strEQ(name, "\027ARNING_BITS")) |
---|
1816 | || (len == 17 && strEQ(name, "\027IDE_SYSTEM_CALLS"))) |
---|
1817 | { |
---|
1818 | goto yes; |
---|
1819 | } |
---|
1820 | break; |
---|
1821 | |
---|
1822 | case '&': |
---|
1823 | case '`': |
---|
1824 | case '\'': |
---|
1825 | case ':': |
---|
1826 | case '?': |
---|
1827 | case '!': |
---|
1828 | case '-': |
---|
1829 | case '#': |
---|
1830 | case '*': |
---|
1831 | case '[': |
---|
1832 | case '^': |
---|
1833 | case '~': |
---|
1834 | case '=': |
---|
1835 | case '%': |
---|
1836 | case '.': |
---|
1837 | case '(': |
---|
1838 | case ')': |
---|
1839 | case '<': |
---|
1840 | case '>': |
---|
1841 | case ',': |
---|
1842 | case '\\': |
---|
1843 | case '/': |
---|
1844 | case '|': |
---|
1845 | case '+': |
---|
1846 | case ';': |
---|
1847 | case ']': |
---|
1848 | case '\001': /* $^A */ |
---|
1849 | case '\003': /* $^C */ |
---|
1850 | case '\004': /* $^D */ |
---|
1851 | case '\005': /* $^E */ |
---|
1852 | case '\006': /* $^F */ |
---|
1853 | case '\010': /* $^H */ |
---|
1854 | case '\011': /* $^I, NOT \t in EBCDIC */ |
---|
1855 | case '\014': /* $^L */ |
---|
1856 | case '\016': /* $^N */ |
---|
1857 | case '\020': /* $^P */ |
---|
1858 | case '\023': /* $^S */ |
---|
1859 | case '\026': /* $^V */ |
---|
1860 | if (len == 1) |
---|
1861 | goto yes; |
---|
1862 | break; |
---|
1863 | case '\024': /* $^T, ${^TAINT} */ |
---|
1864 | if (len == 1 || strEQ(name, "\024AINT")) |
---|
1865 | goto yes; |
---|
1866 | break; |
---|
1867 | case '1': |
---|
1868 | case '2': |
---|
1869 | case '3': |
---|
1870 | case '4': |
---|
1871 | case '5': |
---|
1872 | case '6': |
---|
1873 | case '7': |
---|
1874 | case '8': |
---|
1875 | case '9': |
---|
1876 | if (len > 1) { |
---|
1877 | char *end = name + len; |
---|
1878 | while (--end > name) { |
---|
1879 | if (!isDIGIT(*end)) |
---|
1880 | return FALSE; |
---|
1881 | } |
---|
1882 | } |
---|
1883 | yes: |
---|
1884 | return TRUE; |
---|
1885 | default: |
---|
1886 | break; |
---|
1887 | } |
---|
1888 | return FALSE; |
---|
1889 | } |
---|