git.m6w6.name Git - m6w6/ext-psi/blob - src/libffi.c

   1 #include "php.h"
   2 #include "php_psi.h"
   3 #include "libffi.h"
   4
   5 #include <ffi.h>
   6
   7 static void handler(ffi_cif *signature, void *_result, void **_args, void *_data);
   8
   9 static inline ffi_abi psi_ffi_abi(const char *convention) {
  10         return FFI_DEFAULT_ABI;
  11 }
  12 static inline ffi_type *psi_ffi_type(token_t t) {
  13         switch (t) {
  14         default:
  15                 ZEND_ASSERT(0);
  16                 /* no break */
  17         case PSI_T_VOID:
  18                 return &ffi_type_void;
  19         case PSI_T_SINT8:
  20                 return &ffi_type_sint8;
  21         case PSI_T_UINT8:
  22                 return &ffi_type_uint8;
  23         case PSI_T_SINT16:
  24                 return &ffi_type_sint16;
  25         case PSI_T_UINT16:
  26                 return &ffi_type_uint16;
  27         case PSI_T_SINT32:
  28                 return &ffi_type_sint32;
  29         case PSI_T_UINT32:
  30                 return &ffi_type_uint32;
  31         case PSI_T_SINT64:
  32                 return &ffi_type_sint64;
  33         case PSI_T_UINT64:
  34                 return &ffi_type_uint64;
  35         case PSI_T_BOOL:
  36                 return &ffi_type_uchar;
  37         case PSI_T_CHAR:
  38                 return &ffi_type_schar;
  39         case PSI_T_SHORT:
  40                 return &ffi_type_sshort;
  41         case PSI_T_INT:
  42                 return &ffi_type_sint;
  43         case PSI_T_LONG:
  44                 return &ffi_type_slong;
  45         case PSI_T_FLOAT:
  46                 return &ffi_type_float;
  47         case PSI_T_DOUBLE:
  48                 return &ffi_type_double;
  49         }
  50 }
  51 static inline ffi_type *psi_ffi_decl_type(decl_type *type) {
  52         return psi_ffi_type(real_decl_type(type)->type);
  53 }
  54 static inline ffi_type *psi_ffi_decl_arg_type(decl_arg *darg) {
  55         if (darg->var->pointer_level) {
  56                 return &ffi_type_pointer;
  57         } else {
  58                 return psi_ffi_decl_type(darg->type);
  59         }
  60 }
  61
  62 typedef struct PSI_LibffiContext {
  63         ffi_cif signature;
  64         ffi_type *params[2];
  65         struct {
  66                 struct PSI_LibffiData **list;
  67                 size_t count;
  68         } data;
  69 } PSI_LibffiContext;
  70
  71 typedef struct PSI_LibffiData {
  72         PSI_LibffiContext *context;
  73         impl *impl;
  74         zend_internal_arg_info *arginfo;
  75         void *code;
  76         ffi_closure *closure;
  77         ffi_cif signature;
  78         ffi_type *params[1];
  79 } PSI_LibffiData;
  80
  81 static inline PSI_LibffiData *PSI_LibffiDataAlloc(PSI_LibffiContext *context, impl *impl) {
  82         ffi_status rc;
  83         size_t i, c = impl->decl->args->count;
  84         PSI_LibffiData *data = malloc(sizeof(*data) + c * sizeof(ffi_type *));
  85
  86         data->context = context;
  87         data->impl = impl;
  88         data->arginfo = psi_internal_arginfo(impl);
  89         for (i = 0; i < c; ++i) {
  90                 data->params[i] = psi_ffi_decl_arg_type(impl->decl->args->args[i]);
  91         }
  92         data->params[c] = NULL;
  93
  94         rc = ffi_prep_cif(
  95                         &data->signature,
  96                         psi_ffi_abi(data->impl->decl->abi->convention),
  97                         c,
  98                         psi_ffi_decl_arg_type(data->impl->decl->func),
  99                         data->params);
 100         ZEND_ASSERT(FFI_OK == rc);
 101         data->closure = ffi_closure_alloc(sizeof(ffi_closure), &data->code);
 102         rc = ffi_prep_closure_loc(
 103                         data->closure,
 104                         &context->signature,
 105                         handler,
 106                         data,
 107                         data->code);
 108         ZEND_ASSERT(FFI_OK == rc);
 109
 110         context->data.list = realloc(context->data.list, ++context->data.count * sizeof(*context->data.list));
 111         context->data.list[context->data.count-1] = data;
 112
 113         return data;
 114 }
 115
 116 static inline void PSI_LibffiDataFree(PSI_LibffiData *data) {
 117         free(data->arginfo);
 118         ffi_closure_free(data->closure);
 119         free(data);
 120 }
 121
 122 static inline PSI_LibffiContext *PSI_LibffiContextInit(PSI_LibffiContext *L) {
 123         ffi_status rc;
 124
 125         if (!L) {
 126                 L = malloc(sizeof(*L));
 127         }
 128         memset(L, 0, sizeof(*L));
 129
 130         L->params[0] = &ffi_type_pointer;
 131         L->params[1] = &ffi_type_pointer;
 132         rc = ffi_prep_cif(&L->signature, FFI_DEFAULT_ABI, 2, &ffi_type_void, L->params);
 133         ZEND_ASSERT(rc == FFI_OK);
 134
 135         return L;
 136 }
 137
 138 static inline void PSI_LibffiContextDtor(PSI_LibffiContext *L) {
 139         size_t i;
 140
 141         for (i = 0; i < L->data.count; ++i) {
 142                 PSI_LibffiDataFree(L->data.list[i]);
 143         }
 144         if (L->data.list) {
 145                 free(L->data.list);
 146         }
 147 }
 148
 149 static inline void PSI_LibffiContextFree(PSI_LibffiContext **L) {
 150         if (*L) {
 151                 PSI_LibffiContextDtor(*L);
 152                 free(*L);
 153                 *L = NULL;
 154         }
 155 }
 156
 157 static void handler(ffi_cif *_sig, void *_result, void **_args, void *_data)
 158 {
 159         PSI_LibffiData *data = _data;
 160         size_t i;
 161         void **arg_ptr = NULL, **arg_prm = NULL;
 162         impl_val ret_val;
 163
 164         if (SUCCESS != psi_parse_args(*(zend_execute_data **)_args[0], data->impl)) {
 165                 return;
 166         }
 167
 168         if (data->impl->decl->args->count) {
 169                 arg_ptr = malloc(data->impl->decl->args->count * sizeof(*arg_ptr));
 170                 arg_prm = malloc(data->impl->decl->args->count * sizeof(*arg_prm));
 171
 172                 for (i = 0; i < data->impl->decl->args->count; ++i) {
 173                         decl_arg *darg = data->impl->decl->args->args[i];
 174
 175                         arg_ptr[i] = psi_do_let(darg);
 176                         arg_prm[i] = darg->let->val->is_reference ? &arg_ptr[i] : arg_ptr[i];
 177
 178                         darg->let->ptr = arg_ptr[i];
 179                 }
 180         }
 181
 182         ffi_call(&data->signature, FFI_FN(data->impl->decl->dlptr), &ret_val, arg_prm);
 183
 184         psi_do_return(data->impl, &ret_val, *(zval **)_args[1]);
 185
 186         for (i = 0; i < data->impl->stmts->set.count; ++i) {
 187                 set_stmt *set = data->impl->stmts->set.list[i];
 188
 189                 psi_do_set(set->arg->_zv, set->val->func, set->val->vars);
 190         }
 191
 192         for (i = 0; i < data->impl->stmts->fre.count; ++i) {
 193                 free_stmt *fre = data->impl->stmts->fre.list[i];
 194
 195                 psi_do_free(fre);
 196         }
 197
 198         psi_do_clean(data->impl);
 199
 200         if (arg_ptr) {
 201                 free(arg_ptr);
 202         }
 203         if (arg_prm) {
 204                 free(arg_prm);
 205         }
 206 }
 207
 208 static void init(PSI_Context *C)
 209 {
 210         C->context = PSI_LibffiContextInit(NULL);
 211 }
 212
 213 static void dtor(PSI_Context *C)
 214 {
 215         PSI_LibffiContextFree((void *) &C->context);
 216 }
 217
 218 static zend_function_entry *compile(PSI_Context *C, PSI_Data *D)
 219 {
 220         size_t i, j = 0;
 221         zend_function_entry *zfe = calloc(D->impls->count + 1, sizeof(*zfe));
 222         PSI_LibffiContext *ctx = C->context;
 223
 224         for (i = 0; i < D->impls->count; ++i) {
 225                 zend_function_entry *zf = &zfe[j];
 226                 PSI_LibffiData *data;
 227
 228                 if (!D->impls->list[i]->decl) {
 229                         continue;
 230                 }
 231
 232                 data = PSI_LibffiDataAlloc(ctx, D->impls->list[i]);
 233                 zf->fname = D->impls->list[i]->func->name + (D->impls->list[i]->func->name[0] == '\\');
 234                 zf->num_args = D->impls->list[i]->func->args->count;
 235                 zf->handler = data->code;
 236                 zf->arg_info = data->arginfo;
 237                 ++j;
 238         }
 239
 240         return zfe;
 241 }
 242
 243 static PSI_ContextOps ops = {
 244         init,
 245         dtor,
 246         compile,
 247 };
 248
 249 PSI_ContextOps *PSI_Libffi(void)
 250 {
 251         return &ops;
 252 }