Commit | Line | Data |
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1 | package Data::Dumper::ToXS; |
2 | |
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3 | our (%ix, %seen, $weaken); |
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4 | |
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5 | sub _newix { $_[0].'['.($ix{$_[0]}++).']' } |
6 | sub _getglob { \*{$_[0]} } |
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7 | |
8 | use B qw(svref_2object cstring); |
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9 | use Scalar::Util qw(refaddr isweak); |
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10 | use Moo; |
11 | |
12 | has target_package => (is => 'ro', required => 1); |
13 | |
14 | has _to_generate => (is => 'ro', default => sub { [] }); |
15 | |
16 | sub add_generator { |
17 | my ($self, $name, $ref) = @_; |
18 | die "Generation target must be a reference" unless ref($ref); |
19 | push(@{$self->_to_generate}, [ $name => $ref ]); |
20 | } |
21 | |
22 | sub xs_code { |
23 | my ($self) = @_; |
24 | my @do = @{$self->_to_generate}; |
25 | join "\n\n", $self->_preamble, |
26 | (map $self->_generate_target(@$_), @do), |
27 | $self->_package_start($self->target_package), |
28 | (map $self->_generate_xsub($_->[0]), @do); |
29 | } |
30 | |
31 | sub _preamble { |
32 | <<'END'; |
33 | #define PERL_NO_GET_CONTEXT |
34 | #include "EXTERN.h" |
35 | #include "perl.h" |
36 | #include "XSUB.h" |
37 | |
38 | END |
39 | } |
40 | |
41 | sub _package_start { |
42 | my ($self, $package) = @_; |
43 | <<"END"; |
44 | MODULE = ${package} PACKAGE = ${package} |
45 | |
46 | PROTOTYPES: DISABLE |
47 | |
48 | END |
49 | } |
50 | |
51 | sub _generate_xsub { |
52 | my ($self, $name) = @_; |
53 | <<"END"; |
54 | SV * |
55 | ${name}() |
56 | CODE: |
57 | RETVAL = ${name}(aTHX); |
58 | OUTPUT: |
59 | RETVAL |
60 | END |
61 | } |
62 | |
63 | sub _generate_target { |
64 | my ($self, $name, $ref) = @_; |
65 | local %ix = map +($_ => 0), qw(av hv sv); |
66 | local %seen; |
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67 | local $weaken = ''; |
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68 | my $first = _newix('sv'); |
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69 | my $body = $self->_dump_svrv($first, $ref); |
70 | my $vars = join '', map +( |
71 | $ix{$_} ? " ${\uc}* ${_}[$ix{$_}];\n" : "" |
72 | ), qw(av hv sv); |
73 | <<"END"; |
74 | SV * ${name} (pTHX) |
75 | { |
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76 | ${vars}${body}${weaken} return ${first}; |
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77 | } |
78 | END |
79 | } |
80 | |
81 | sub _dump_svrv { |
82 | my ($self, $ix, $ref) = @_; |
83 | my $r = ref($ref); |
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84 | $weaken .= " sv_rvweaken(${ix});\n" if isweak($_[2]); |
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85 | if ($seen{$ref}) { |
86 | # already seen this reference so make a copy |
87 | " ${ix} = newSVsv($seen{$ref});\n"; |
88 | } else { |
89 | $seen{$ref} = $ix; |
90 | if ($r eq 'SCALAR') { |
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91 | my $t_ix = _newix('sv'); |
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92 | join '', |
93 | $self->_dump_sv($t_ix, $ref), |
94 | " ${ix} = newRV_noinc(${t_ix});\n"; |
95 | } elsif ($r eq 'HASH') { |
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96 | my $t_ix = _newix('hv'); |
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97 | join '', |
98 | $self->_dump_hv($t_ix, $ref), |
99 | " ${ix} = newRV_noinc((SV *)${t_ix});\n"; |
100 | } elsif ($r eq 'ARRAY') { |
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101 | my $t_ix = _newix('av'); |
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102 | join '', |
103 | $self->_dump_av($t_ix, $ref), |
104 | " ${ix} = newRV_noinc((SV *)${t_ix});\n"; |
105 | } elsif ($r eq 'REF') { |
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106 | my $t_ix = _newix('sv'); |
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107 | join '', |
108 | $self->_dump_svrv($t_ix, $$ref), |
109 | " ${ix} = newRV_noinc(${t_ix});\n"; |
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110 | } elsif ($r eq 'CODE') { |
111 | my $full_name = join '::', |
112 | map $_->NAME, map +($_->GV->STASH, $_->GV), svref_2object($ref); |
113 | if (*{_getglob($full_name)}{CODE}||'' eq $ref) { |
114 | # GV_ADD strikes me as more likely to DWIM than to simply blow up |
115 | # if the generated routine gets called before the method is declared. |
116 | " ${ix} = newRV_inc((SV *) get_cv(${\cstring $full_name}, GV_ADD));\n"; |
117 | } else { |
118 | die "Can't find ${ref} at ${full_name}"; |
119 | } |
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120 | } else { |
121 | die "Can't handle reftype ${r}"; |
122 | } |
123 | } |
124 | } |
125 | |
126 | sub _dump_sv { |
127 | my ($self, $ix, $ref) = @_; |
128 | if (ref($$ref)) { |
129 | $self->_dump_svrv($ix, $$ref); |
130 | } else { |
131 | # Not a reference. What are we dumping? |
132 | my $sv = svref_2object($ref); |
133 | if (!defined($$ref)) { |
134 | " ${ix} = newSVsv(&PL_sv_undef);\n"; |
135 | } elsif ($sv->isa('B::IV')) { |
136 | " ${ix} = newSViv(".$sv->int_value.");\n"; |
137 | } elsif ($sv->isa('B::NV')) { |
138 | " ${ix} = newSVnv(".$sv->NV.");\n"; |
139 | } elsif ($sv->isa('B::PV')) { |
140 | " ${ix} = newSVpvs(".cstring($$ref).");\n"; |
141 | } else { |
142 | die "Unsure how to dump ".$$ref; |
143 | } |
144 | } |
145 | } |
146 | |
147 | sub _dump_hv { |
148 | my ($self, $ix, $ref) = @_; |
149 | join '', |
150 | " ${ix} = newHV();\n", |
151 | map { |
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152 | my $t_ix = _newix('sv'); |
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153 | ($self->_dump_sv($t_ix, \($ref->{$_})), |
154 | " hv_stores(${ix}, ${\cstring $_}, ${t_ix});\n") |
155 | } sort keys %$ref; |
156 | } |
157 | |
158 | sub _dump_av { |
159 | my ($self, $ix, $ref) = @_; |
160 | join '', |
161 | " ${ix} = newAV();\n", |
162 | map { |
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163 | my $t_ix = _newix('sv'); |
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164 | $self->_dump_sv($t_ix, \($ref->[$_])), |
165 | " av_push(${ix}, ${t_ix});\n" |
166 | } 0 .. $#$ref; |
167 | } |
168 | |
169 | 1; |