1 | /* xsutils.c |
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2 | * |
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3 | * Copyright (C) 1999, 2000, 2001, 2002, 2003, by Larry Wall and others |
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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 | * "Perilous to us all are the devices of an art deeper than we possess |
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12 | * ourselves." --Gandalf |
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13 | */ |
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14 | |
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15 | |
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16 | #include "EXTERN.h" |
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17 | #define PERL_IN_XSUTILS_C |
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18 | #include "perl.h" |
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19 | |
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20 | /* |
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21 | * Contributed by Spider Boardman (spider.boardman@orb.nashua.nh.us). |
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22 | */ |
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23 | |
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24 | /* package attributes; */ |
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25 | void XS_attributes__warn_reserved(pTHX_ CV *cv); |
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26 | void XS_attributes_reftype(pTHX_ CV *cv); |
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27 | void XS_attributes__modify_attrs(pTHX_ CV *cv); |
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28 | void XS_attributes__guess_stash(pTHX_ CV *cv); |
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29 | void XS_attributes__fetch_attrs(pTHX_ CV *cv); |
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30 | void XS_attributes_bootstrap(pTHX_ CV *cv); |
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31 | |
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32 | |
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33 | /* |
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34 | * Note that only ${pkg}::bootstrap definitions should go here. |
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35 | * This helps keep down the start-up time, which is especially |
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36 | * relevant for users who don't invoke any features which are |
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37 | * (partially) implemented here. |
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38 | * |
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39 | * The various bootstrap definitions can take care of doing |
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40 | * package-specific newXS() calls. Since the layout of the |
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41 | * bundled *.pm files is in a version-specific directory, |
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42 | * version checks in these bootstrap calls are optional. |
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43 | */ |
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44 | |
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45 | void |
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46 | Perl_boot_core_xsutils(pTHX) |
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47 | { |
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48 | char *file = __FILE__; |
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49 | |
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50 | newXS("attributes::bootstrap", XS_attributes_bootstrap, file); |
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51 | } |
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52 | |
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53 | #include "XSUB.h" |
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54 | |
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55 | static int |
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56 | modify_SV_attributes(pTHX_ SV *sv, SV **retlist, SV **attrlist, int numattrs) |
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57 | { |
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58 | SV *attr; |
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59 | char *name; |
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60 | STRLEN len; |
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61 | bool negated; |
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62 | int nret; |
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63 | |
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64 | for (nret = 0 ; numattrs && (attr = *attrlist++); numattrs--) { |
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65 | name = SvPV(attr, len); |
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66 | if ((negated = (*name == '-'))) { |
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67 | name++; |
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68 | len--; |
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69 | } |
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70 | switch (SvTYPE(sv)) { |
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71 | case SVt_PVCV: |
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72 | switch ((int)len) { |
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73 | case 6: |
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74 | switch (*name) { |
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75 | case 'l': |
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76 | #ifdef CVf_LVALUE |
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77 | if (strEQ(name, "lvalue")) { |
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78 | if (negated) |
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79 | CvFLAGS((CV*)sv) &= ~CVf_LVALUE; |
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80 | else |
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81 | CvFLAGS((CV*)sv) |= CVf_LVALUE; |
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82 | continue; |
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83 | } |
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84 | #endif /* defined CVf_LVALUE */ |
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85 | if (strEQ(name, "locked")) { |
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86 | if (negated) |
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87 | CvFLAGS((CV*)sv) &= ~CVf_LOCKED; |
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88 | else |
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89 | CvFLAGS((CV*)sv) |= CVf_LOCKED; |
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90 | continue; |
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91 | } |
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92 | break; |
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93 | case 'm': |
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94 | if (strEQ(name, "method")) { |
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95 | if (negated) |
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96 | CvFLAGS((CV*)sv) &= ~CVf_METHOD; |
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97 | else |
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98 | CvFLAGS((CV*)sv) |= CVf_METHOD; |
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99 | continue; |
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100 | } |
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101 | break; |
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102 | case 'u': |
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103 | if (strEQ(name, "unique")) { |
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104 | if (negated) |
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105 | GvUNIQUE_off(CvGV((CV*)sv)); |
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106 | else |
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107 | GvUNIQUE_on(CvGV((CV*)sv)); |
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108 | continue; |
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109 | } |
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110 | break; |
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111 | } |
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112 | break; |
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113 | } |
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114 | break; |
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115 | default: |
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116 | switch ((int)len) { |
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117 | case 6: |
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118 | switch (*name) { |
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119 | case 's': |
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120 | if (strEQ(name, "shared")) { |
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121 | if (negated) |
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122 | Perl_croak(aTHX_ "A variable may not be unshared"); |
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123 | SvSHARE(sv); |
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124 | continue; |
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125 | } |
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126 | break; |
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127 | case 'u': |
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128 | if (strEQ(name, "unique")) { |
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129 | if (SvTYPE(sv) == SVt_PVGV) { |
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130 | if (negated) |
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131 | GvUNIQUE_off(sv); |
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132 | else |
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133 | GvUNIQUE_on(sv); |
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134 | } |
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135 | /* Hope this came from toke.c if not a GV. */ |
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136 | continue; |
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137 | } |
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138 | } |
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139 | } |
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140 | break; |
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141 | } |
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142 | /* anything recognized had a 'continue' above */ |
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143 | *retlist++ = attr; |
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144 | nret++; |
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145 | } |
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146 | |
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147 | return nret; |
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148 | } |
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149 | |
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150 | |
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151 | |
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152 | /* package attributes; */ |
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153 | |
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154 | XS(XS_attributes_bootstrap) |
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155 | { |
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156 | dXSARGS; |
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157 | char *file = __FILE__; |
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158 | |
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159 | if( items > 1 ) |
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160 | Perl_croak(aTHX_ "Usage: attributes::bootstrap $module"); |
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161 | |
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162 | newXSproto("attributes::_warn_reserved", XS_attributes__warn_reserved, file, ""); |
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163 | newXS("attributes::_modify_attrs", XS_attributes__modify_attrs, file); |
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164 | newXSproto("attributes::_guess_stash", XS_attributes__guess_stash, file, "$"); |
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165 | newXSproto("attributes::_fetch_attrs", XS_attributes__fetch_attrs, file, "$"); |
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166 | newXSproto("attributes::reftype", XS_attributes_reftype, file, "$"); |
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167 | |
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168 | XSRETURN(0); |
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169 | } |
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170 | |
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171 | XS(XS_attributes__modify_attrs) |
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172 | { |
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173 | dXSARGS; |
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174 | SV *rv, *sv; |
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175 | |
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176 | if (items < 1) { |
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177 | usage: |
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178 | Perl_croak(aTHX_ |
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179 | "Usage: attributes::_modify_attrs $reference, @attributes"); |
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180 | } |
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181 | |
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182 | rv = ST(0); |
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183 | if (!(SvOK(rv) && SvROK(rv))) |
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184 | goto usage; |
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185 | sv = SvRV(rv); |
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186 | if (items > 1) |
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187 | XSRETURN(modify_SV_attributes(aTHX_ sv, &ST(0), &ST(1), items-1)); |
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188 | |
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189 | XSRETURN(0); |
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190 | } |
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191 | |
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192 | XS(XS_attributes__fetch_attrs) |
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193 | { |
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194 | dXSARGS; |
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195 | SV *rv, *sv; |
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196 | cv_flags_t cvflags; |
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197 | |
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198 | if (items != 1) { |
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199 | usage: |
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200 | Perl_croak(aTHX_ |
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201 | "Usage: attributes::_fetch_attrs $reference"); |
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202 | } |
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203 | |
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204 | rv = ST(0); |
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205 | SP -= items; |
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206 | if (!(SvOK(rv) && SvROK(rv))) |
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207 | goto usage; |
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208 | sv = SvRV(rv); |
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209 | |
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210 | switch (SvTYPE(sv)) { |
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211 | case SVt_PVCV: |
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212 | cvflags = CvFLAGS((CV*)sv); |
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213 | if (cvflags & CVf_LOCKED) |
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214 | XPUSHs(sv_2mortal(newSVpvn("locked", 6))); |
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215 | #ifdef CVf_LVALUE |
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216 | if (cvflags & CVf_LVALUE) |
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217 | XPUSHs(sv_2mortal(newSVpvn("lvalue", 6))); |
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218 | #endif |
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219 | if (cvflags & CVf_METHOD) |
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220 | XPUSHs(sv_2mortal(newSVpvn("method", 6))); |
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221 | if (GvUNIQUE(CvGV((CV*)sv))) |
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222 | XPUSHs(sv_2mortal(newSVpvn("unique", 6))); |
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223 | break; |
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224 | case SVt_PVGV: |
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225 | if (GvUNIQUE(sv)) |
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226 | XPUSHs(sv_2mortal(newSVpvn("unique", 6))); |
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227 | break; |
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228 | default: |
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229 | break; |
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230 | } |
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231 | |
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232 | PUTBACK; |
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233 | } |
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234 | |
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235 | XS(XS_attributes__guess_stash) |
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236 | { |
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237 | dXSARGS; |
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238 | SV *rv, *sv; |
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239 | #ifdef dXSTARGET |
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240 | dXSTARGET; |
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241 | #else |
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242 | SV * TARG = sv_newmortal(); |
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243 | #endif |
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244 | |
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245 | if (items != 1) { |
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246 | usage: |
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247 | Perl_croak(aTHX_ |
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248 | "Usage: attributes::_guess_stash $reference"); |
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249 | } |
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250 | |
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251 | rv = ST(0); |
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252 | ST(0) = TARG; |
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253 | if (!(SvOK(rv) && SvROK(rv))) |
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254 | goto usage; |
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255 | sv = SvRV(rv); |
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256 | |
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257 | if (SvOBJECT(sv)) |
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258 | sv_setpv(TARG, HvNAME(SvSTASH(sv))); |
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259 | #if 0 /* this was probably a bad idea */ |
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260 | else if (SvPADMY(sv)) |
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261 | sv_setsv(TARG, &PL_sv_no); /* unblessed lexical */ |
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262 | #endif |
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263 | else { |
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264 | HV *stash = Nullhv; |
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265 | switch (SvTYPE(sv)) { |
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266 | case SVt_PVCV: |
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267 | if (CvGV(sv) && isGV(CvGV(sv)) && GvSTASH(CvGV(sv))) |
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268 | stash = GvSTASH(CvGV(sv)); |
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269 | else if (/* !CvANON(sv) && */ CvSTASH(sv)) |
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270 | stash = CvSTASH(sv); |
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271 | break; |
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272 | case SVt_PVMG: |
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273 | if (!(SvFAKE(sv) && SvTIED_mg(sv, PERL_MAGIC_glob))) |
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274 | break; |
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275 | /*FALLTHROUGH*/ |
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276 | case SVt_PVGV: |
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277 | if (GvGP(sv) && GvESTASH((GV*)sv)) |
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278 | stash = GvESTASH((GV*)sv); |
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279 | break; |
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280 | default: |
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281 | break; |
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282 | } |
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283 | if (stash) |
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284 | sv_setpv(TARG, HvNAME(stash)); |
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285 | } |
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286 | |
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287 | #ifdef dXSTARGET |
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288 | SvSETMAGIC(TARG); |
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289 | #endif |
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290 | XSRETURN(1); |
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291 | } |
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292 | |
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293 | XS(XS_attributes_reftype) |
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294 | { |
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295 | dXSARGS; |
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296 | SV *rv, *sv; |
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297 | #ifdef dXSTARGET |
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298 | dXSTARGET; |
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299 | #else |
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300 | SV * TARG = sv_newmortal(); |
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301 | #endif |
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302 | |
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303 | if (items != 1) { |
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304 | usage: |
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305 | Perl_croak(aTHX_ |
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306 | "Usage: attributes::reftype $reference"); |
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307 | } |
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308 | |
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309 | rv = ST(0); |
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310 | ST(0) = TARG; |
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311 | if (SvGMAGICAL(rv)) |
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312 | mg_get(rv); |
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313 | if (!(SvOK(rv) && SvROK(rv))) |
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314 | goto usage; |
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315 | sv = SvRV(rv); |
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316 | sv_setpv(TARG, sv_reftype(sv, 0)); |
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317 | #ifdef dXSTARGET |
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318 | SvSETMAGIC(TARG); |
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319 | #endif |
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320 | |
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321 | XSRETURN(1); |
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322 | } |
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323 | |
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324 | XS(XS_attributes__warn_reserved) |
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325 | { |
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326 | dXSARGS; |
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327 | #ifdef dXSTARGET |
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328 | dXSTARGET; |
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329 | #else |
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330 | SV * TARG = sv_newmortal(); |
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331 | #endif |
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332 | |
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333 | if (items != 0) { |
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334 | Perl_croak(aTHX_ |
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335 | "Usage: attributes::_warn_reserved ()"); |
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336 | } |
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337 | |
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338 | EXTEND(SP,1); |
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339 | ST(0) = TARG; |
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340 | sv_setiv(TARG, ckWARN(WARN_RESERVED) != 0); |
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341 | #ifdef dXSTARGET |
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342 | SvSETMAGIC(TARG); |
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343 | #endif |
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344 | |
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345 | XSRETURN(1); |
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346 | } |
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347 | |
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