1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
// vendored from the cfg-if crate to avoid breaking ctest
macro_rules! cfg_if {
    // match if/else chains with a final `else`
    ($(
        if #[cfg($($meta:meta),*)] { $($it:item)* }
    ) else * else {
        $($it2:item)*
    }) => {
        cfg_if! {
            @__items
            () ;
            $( ( ($($meta),*) ($($it)*) ), )*
            ( () ($($it2)*) ),
        }
    };

    // match if/else chains lacking a final `else`
    (
        if #[cfg($($i_met:meta),*)] { $($i_it:item)* }
        $(
            else if #[cfg($($e_met:meta),*)] { $($e_it:item)* }
        )*
    ) => {
        cfg_if! {
            @__items
            () ;
            ( ($($i_met),*) ($($i_it)*) ),
            $( ( ($($e_met),*) ($($e_it)*) ), )*
            ( () () ),
        }
    };

    // Internal and recursive macro to emit all the items
    //
    // Collects all the negated cfgs in a list at the beginning and after the
    // semicolon is all the remaining items
    (@__items ($($not:meta,)*) ; ) => {};
    (@__items ($($not:meta,)*) ; ( ($($m:meta),*) ($($it:item)*) ), $($rest:tt)*) => {
        // Emit all items within one block, applying an approprate #[cfg]. The
        // #[cfg] will require all `$m` matchers specified and must also negate
        // all previous matchers.
        cfg_if! { @__apply cfg(all($($m,)* not(any($($not),*)))), $($it)* }

        // Recurse to emit all other items in `$rest`, and when we do so add all
        // our `$m` matchers to the list of `$not` matchers as future emissions
        // will have to negate everything we just matched as well.
        cfg_if! { @__items ($($not,)* $($m,)*) ; $($rest)* }
    };

    // Internal macro to Apply a cfg attribute to a list of items
    (@__apply $m:meta, $($it:item)*) => {
        $(#[$m] $it)*
    };
}

macro_rules! stack {
    ($t:ident) => {
        cfg_if! {
            if #[cfg(ossl110)] {
                pub enum $t {}
            } else {
                #[repr(C)]
                pub struct $t {
                    pub stack: ::_STACK,
                }
            }
        }
    };
}

#[cfg(const_fn)]
macro_rules! const_fn {
    ($(pub const fn $name:ident($($arg:ident: $t:ty),*) -> $ret:ty $b:block)*) => {
        $(
            pub const fn $name($($arg: $t),*) -> $ret $b
        )*
    }
}

#[cfg(not(const_fn))]
macro_rules! const_fn {
    ($(pub const fn $name:ident($($arg:ident: $t:ty),*) -> $ret:ty $b:block)*) => {
        $(
            pub fn $name($($arg: $t),*) -> $ret $b
        )*
    }
}

// openssl changes `*mut` to `*const` in certain parameters in certain versions;
// in C this is ABI and (mostly) API compatible.
//
// We need to handle this explicitly, and this macro helps annotate which
// parameter got converted in which version.
//
// Input is:
//    extern "C" {
//        #[attributes...]
//        pub fn name(args) -> rettype; // `-> rettype` optional
//        // more functions...
//    }
//
// This macro replaces `#[const_ptr_if(...)]` in types with `*const` or `*mut`
// (depending on the inner cfg flags)
//
// Walks through all argument and return types, but only finds inner types of
// `*const` and `*mut`; doesn't walk arrays or generics.
//
// NOTE: can't abstract `pub` as `$fn_vis:vis`, as ctest macro handling doesn't
// support it (old syntax crate). But we really only need `pub` anyway.
//
// NOTE: ctest seams to simply ignore macros it can't expand (whatever the
// reason)
macro_rules! const_ptr_api {
    // ----------------------------------------------------------------
    // (partialarg): partial argument, waiting for "final" argument type
    // MAGIC PART 1: hande conditional const ptr in argument type
    ( (partialarg)
        { $(#[$fn_attr:meta])* pub fn $fn_name:ident }
        $args_packed:tt
        [ $($part_arg:tt)* ]
        [ #[const_ptr_if( $($cfg:tt)* )] $($arg_rem:tt)* ]
        $ret_packed:tt
    ) => {
        const_ptr_api!( (partialarg) { #[cfg($($cfg)*)]      $(#[$fn_attr])* pub fn $fn_name } $args_packed [ $($part_arg)* *const ] [ $($arg_rem)* ] $ret_packed );
        const_ptr_api!( (partialarg) { #[cfg(not($($cfg)*))] $(#[$fn_attr])* pub fn $fn_name } $args_packed [ $($part_arg)* *mut   ] [ $($arg_rem)* ] $ret_packed );
    };
    // continue partial argument with `*mut` pointer (might need special const handling in inner type)
    ( (partialarg)
        $def_packed:tt
        $args_packed:tt
        [ $($part_arg:tt)* ]
        [ *mut $($arg_rem:tt)* ]
        $ret_packed:tt
    ) => {
        const_ptr_api!( (partialarg) $def_packed $args_packed [ $($part_arg)* *mut ] [ $($arg_rem)* ] $ret_packed );
    };
    // continue partial argument with `*const` pointer (might need special const handling in inner type)
    ( (partialarg)
        $def_packed:tt
        $args_packed:tt
        [ $($part_arg:tt)* ]
        [ *const $($arg_rem:tt)* ]
        $ret_packed:tt
    ) => {
        const_ptr_api!( (partialarg) $def_packed $args_packed [ $($part_arg)* *const ] [ $($arg_rem)* ] $ret_packed );
    };
    // finish partial argument with trailing comma
    ( (partialarg)
        $def_packed:tt
        { $($args_tt:tt)* }
        [ $($part_arg:tt)* ]
        [ $arg_ty:ty, $($arg_rem:tt)* ]
        $ret_packed:tt
    ) => {
        const_ptr_api!( (parseargs) $def_packed { $($args_tt)* { $($part_arg)* $arg_ty } } [ $($arg_rem)* ] $ret_packed );
    };
    // finish final partial argument (no trailing comma)
    ( (partialarg)
        $def_packed:tt
        { $($args_tt:tt)* }
        [ $($part_arg:tt)* ]
        [ $arg_ty:ty ]
        $ret_packed:tt
    ) => {
        const_ptr_api!( (parseargs) $def_packed { $($args_tt)* { $($part_arg)* $arg_ty } } [ ] $ret_packed );
    };

    // ----------------------------------------------------------------
    // (parseargs): parsing arguments
    // start next argument
    ( (parseargs)
        $def_packed:tt
        $args_packed:tt
        [ $arg_name:ident : $($arg_rem:tt)* ]
        $ret_packed:tt
    ) => {
        const_ptr_api!( (partialarg) $def_packed $args_packed [ $arg_name: ] [ $($arg_rem)* ] $ret_packed );
    };
    // end of arguments, there is a return type; start parsing it
    ( (parseargs)
        $def_packed:tt
        $args_packed:tt
        [ ]
        [ -> $($rem:tt)* ]
    ) => {
        const_ptr_api!( (partialret) $def_packed $args_packed [] [ $($rem)* ] );
    };
    // end of arguments, no return type
    ( (parseargs)
        $def_packed:tt
        $args_packed:tt
        [ ]
        [ ]
    ) => {
        const_ptr_api!( (generate) $def_packed $args_packed { () } );
    };

    // ----------------------------------------------------------------
    // (partialret): have partial return type, waiting for final return type
    // MAGIC PART 2: hande conditional const ptr in return type
    ( (partialret)
        { $(#[$fn_attr:meta])* pub fn $fn_name:ident }
        $args_packed:tt
        [ $($part_ret:tt)* ]
        [ #[const_ptr_if( $($cfg:tt)* )] $($rem:tt)* ]
    ) => {
        const_ptr_api!( (partialret) { #[cfg($($cfg)*)]      $(#[$fn_attr])* pub fn $fn_name } $args_packed [ $($part_ret)* *const ] [ $($rem)* ] );
        const_ptr_api!( (partialret) { #[cfg(not($($cfg)*))] $(#[$fn_attr])* pub fn $fn_name } $args_packed [ $($part_ret)* *mut   ] [ $($rem)* ] );
    };
    // `* mut` part in return type; continue parsing to find inner conditional const ptr
    ( (partialret)
        $def_packed:tt
        $args_packed:tt
        [ $($part_ret:tt)* ]
        [ *mut $($rem:tt)* ]
    ) => {
        const_ptr_api!( (partialret) $def_packed $args_packed [ $($part_ret)* *mut ] [ $($rem)* ] );
    };
    // `* const` part in return type; continue parsing to find inner conditional const ptr
    ( (partialret)
        $def_packed:tt
        $args_packed:tt
        [ $($part_ret:tt)* ]
        [ *const $($rem:tt)* ]
    ) => {
        const_ptr_api!( (partialret) $def_packed $args_packed [ $($part_ret)* *const ] [ $($rem)* ] );
    };
    // final part of return type
    ( (partialret)
        $def_packed:tt
        $args_packed:tt
        [ $($part_ret:tt)* ]
        [ $ret_ty:ty ]
    ) => {
        const_ptr_api!( (generate) $def_packed $args_packed { $($part_ret)* $ret_ty } );
    };

    // ----------------------------------------------------------------
    // generate
    ( (generate)
        { $(#[$fn_attr:meta])* pub fn $fn_name:ident }
        { $({ $arg_name:ident: $($arg_ty:tt)* })* }
        { $ret_ty:ty }
    ) => {
        extern "C" {
            $(#[$fn_attr])*
            pub fn $fn_name( $(
                $arg_name: $($arg_ty)*
            ),* ) -> $ret_ty;
        }
    };

    // ----------------------------------------------------------------
    // (fn): gather tokens for return type until ";"
    // found end; start parsing current function, and parse remaining functions
    ( (fn)
        $def_packed:tt
        $arg_tts_packed:tt
        $ret_packed:tt
        [ ; $($rem:tt)* ]
    ) => {
        const_ptr_api!( (parseargs) $def_packed {} $arg_tts_packed $ret_packed );
        const_ptr_api!( (extern) [ $($rem)* ] );
    };
    // not ";" - all other tokens are part of the return type.
    // don't expand return type yet; otherwise we'd have to remember in which branch `rem` needs
    // to be used to parse further functions.
    ( (fn)
        $def_packed:tt
        $arg_tts_packed:tt
        [ $($ret_tt:tt)* ]
        [ $tt:tt $($rem:tt)* ]
    ) => {
        const_ptr_api!( (fn) $def_packed $arg_tts_packed [ $($ret_tt)* $tt ] [ $($rem)* ] );
    };

    // ----------------------------------------------------------------
    // (extern): in extern block, find next function
    // try to split into functions as fast as possible to reduce recursion depth
    ( (extern) [
        $(#[$fn_attr:meta])*
        pub fn $fn_name:ident( $($arg_rem:tt)* ) $($rem:tt)*
    ] ) => {
        const_ptr_api!( (fn)
            { $(#[$fn_attr])* pub fn $fn_name } [ $($arg_rem)* ] [] [ $($rem)* ]
        );
    };
    // end of extern block
    ( (extern) [] ) => {};

    // ----------------------------------------------------------------
    // macro start; find extern block
    ( extern "C" { $($rem:tt)* } ) => {
        const_ptr_api!( (extern) [ $($rem)* ] );
    };
}