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/* You may distribute under the terms of either the GNU General Public License |
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* or the Artistic License (the same terms as Perl itself) |
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* |
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* (C) Paul Evans, 2021-2022 -- leonerd@leonerd.org.uk |
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*/ |
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#define PERL_NO_GET_CONTEXT |
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8
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#include "EXTERN.h" |
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#include "perl.h" |
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10
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#include "XSUB.h" |
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11
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12
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#include "object_pad.h" |
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13
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14
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struct Data { |
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15
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unsigned int is_weak : 1; |
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16
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SV *fieldname; |
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SV *classname; |
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18
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}; |
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19
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20
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6
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static int magic_set(pTHX_ SV *sv, MAGIC *mg) |
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21
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{ |
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6
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struct Data *data = (struct Data *)mg->mg_ptr; |
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6
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SV *savesv = mg->mg_obj; |
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24
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25
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6
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bool ok = sv_derived_from_sv(sv, data->classname, 0); |
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26
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27
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6
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100
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if(ok) { |
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28
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3
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sv_setsv(savesv, sv); |
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29
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3
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100
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if(data->is_weak) |
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30
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3
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sv_rvweaken(savesv); |
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31
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return 1; |
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32
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} |
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33
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34
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/* Restore last known-good value */ |
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35
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3
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sv_setsv_nomg(sv, savesv); |
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36
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3
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100
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if(data->is_weak) |
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37
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1
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sv_rvweaken(sv); |
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38
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39
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3
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croak("Field %" SVf " requires an object of type %" SVf, |
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3
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SVfARG(data->fieldname), SVfARG(data->classname)); |
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41
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42
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return 1; |
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43
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} |
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44
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45
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static const MGVTBL vtbl = { |
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46
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.svt_set = &magic_set, |
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47
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}; |
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48
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49
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3
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static bool isa_apply(pTHX_ FieldMeta *fieldmeta, SV *value, SV **attrdata_ptr, void *_funcdata) |
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50
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{ |
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51
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struct Data *data; |
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52
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3
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Newx(data, 1, struct Data); |
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53
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54
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3
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data->is_weak = false; |
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55
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3
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data->fieldname = SvREFCNT_inc(mop_field_get_name(fieldmeta)); |
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56
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3
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data->classname = SvREFCNT_inc(value); |
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57
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58
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3
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*attrdata_ptr = (SV *)data; |
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59
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60
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3
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return TRUE; |
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61
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} |
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62
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63
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3
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static void isa_seal(pTHX_ FieldMeta *fieldmeta, SV *attrdata, void *_funcdata) |
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64
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{ |
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65
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struct Data *data = (struct Data *)attrdata; |
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66
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67
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3
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100
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if(mop_field_get_attribute(fieldmeta, "weak")) |
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68
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1
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data->is_weak = true; |
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69
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3
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} |
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70
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71
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5
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static void isa_post_makefield(pTHX_ FieldMeta *fieldmeta, SV *attrdata, void *_funcdata, SV *field) |
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72
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{ |
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73
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5
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sv_magicext(field, newSV(0), PERL_MAGIC_ext, &vtbl, (char *)attrdata, 0); |
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74
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5
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} |
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75
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76
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static const struct FieldHookFuncs isa_hooks = { |
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77
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.ver = OBJECTPAD_ABIVERSION, |
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78
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.flags = OBJECTPAD_FLAG_ATTR_MUST_VALUE, |
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79
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.permit_hintkey = "Object::Pad::FieldAttr::Isa/Isa", |
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80
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81
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.apply = &isa_apply, |
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82
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.seal = &isa_seal, |
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83
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.post_makefield = &isa_post_makefield, |
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84
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}; |
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85
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86
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MODULE = Object::Pad::FieldAttr::Isa PACKAGE = Object::Pad::FieldAttr::Isa |
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87
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88
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BOOT: |
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89
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3
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register_field_attribute("Isa", &isa_hooks, NULL); |