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 #undef PACKAGE
   6 #undef PACKAGE_BUGREPORT
   7 #undef PACKAGE_NAME
   8 #undef PACKAGE_STRING
   9 #undef PACKAGE_TARNAME
  10 #undef PACKAGE_VERSION
  11
  12 #include <ffi.h>
  13
  14 #ifndef PSI_HAVE_FFI_CLOSURE_ALLOC
  15 # if HAVE_UNISTD_H
  16 #  include <unistd.h>
  17 # endif
  18 # if HAVE_SYS_MMAN_H
  19 #  include <sys/mman.h>
  20 #  ifndef MAP_ANONYMOUS
  21 #   define MAP_ANONYMOUS MAP_ANON
  22 #  endif
  23 # endif
  24 #endif
  25
  26 static void *psi_ffi_closure_alloc(size_t s, void **code)
  27 {
  28 #ifdef PSI_HAVE_FFI_CLOSURE_ALLOC
  29         return ffi_closure_alloc(s, code);
  30 #elif HAVE_MMAP
  31         *code = mmap(NULL, s, PROT_EXEC|PROT_WRITE|PROT_READ,
  32                         MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
  33         if (MAP_FAILED == *code) {
  34                 return NULL;
  35         }
  36         return *code;
  37 #else
  38         return NULL;
  39 #endif
  40 }
  41
  42 static void psi_ffi_closure_free(void *c)
  43 {
  44 #ifdef PSI_HAVE_FFI_CLOSURE_ALLOC
  45         ffi_closure_free(c);
  46 #elif HAVE_MMAP
  47         munmap(c, sizeof(ffi_closure));
  48 #endif
  49 }
  50
  51 static void handler(ffi_cif *signature, void *_result, void **_args, void *_data);
  52
  53 static inline ffi_abi psi_ffi_abi(const char *convention) {
  54         return FFI_DEFAULT_ABI;
  55 }
  56 static inline ffi_type *psi_ffi_type(token_t t) {
  57         switch (t) {
  58         default:
  59                 ZEND_ASSERT(0);
  60                 /* no break */
  61         case PSI_T_VOID:
  62                 return &ffi_type_void;
  63         case PSI_T_SINT8:
  64                 return &ffi_type_sint8;
  65         case PSI_T_UINT8:
  66                 return &ffi_type_uint8;
  67         case PSI_T_SINT16:
  68                 return &ffi_type_sint16;
  69         case PSI_T_UINT16:
  70                 return &ffi_type_uint16;
  71         case PSI_T_SINT32:
  72                 return &ffi_type_sint32;
  73         case PSI_T_UINT32:
  74                 return &ffi_type_uint32;
  75         case PSI_T_SINT64:
  76                 return &ffi_type_sint64;
  77         case PSI_T_UINT64:
  78                 return &ffi_type_uint64;
  79         case PSI_T_BOOL:
  80                 return &ffi_type_uchar;
  81         case PSI_T_CHAR:
  82                 return &ffi_type_schar;
  83         case PSI_T_SHORT:
  84                 return &ffi_type_sshort;
  85         case PSI_T_INT:
  86                 return &ffi_type_sint;
  87         case PSI_T_LONG:
  88                 return &ffi_type_slong;
  89         case PSI_T_FLOAT:
  90                 return &ffi_type_float;
  91         case PSI_T_DOUBLE:
  92                 return &ffi_type_double;
  93         }
  94 }
  95 static inline ffi_type *psi_ffi_decl_type(decl_type *type) {
  96         return psi_ffi_type(real_decl_type(type)->type);
  97 }
  98 static inline ffi_type *psi_ffi_decl_arg_type(decl_arg *darg) {
  99         if (darg->var->pointer_level) {
 100                 return &ffi_type_pointer;
 101         } else {
 102                 return psi_ffi_decl_type(darg->type);
 103         }
 104 }
 105
 106 typedef struct PSI_LibffiContext {
 107         ffi_cif signature;
 108         ffi_type *params[2];
 109         struct {
 110                 struct PSI_LibffiData **list;
 111                 size_t count;
 112         } data;
 113 } PSI_LibffiContext;
 114
 115 typedef struct PSI_LibffiData {
 116         PSI_LibffiContext *context;
 117         impl *impl;
 118         zend_internal_arg_info *arginfo;
 119         void *code;
 120         ffi_closure *closure;
 121         ffi_cif signature;
 122         ffi_type *params[1];
 123 } PSI_LibffiData;
 124
 125 static inline PSI_LibffiData *PSI_LibffiDataAlloc(PSI_LibffiContext *context, impl *impl) {
 126         ffi_status rc;
 127         size_t i, c = impl->decl->args ? impl->decl->args->count : 0;
 128         PSI_LibffiData *data = malloc(sizeof(*data) + c * sizeof(ffi_type *));
 129
 130         data->context = context;
 131         data->impl = impl;
 132         data->arginfo = psi_internal_arginfo(impl);
 133         for (i = 0; i < c; ++i) {
 134                 data->params[i] = psi_ffi_decl_arg_type(impl->decl->args->args[i]);
 135         }
 136         data->params[c] = NULL;
 137
 138         rc = ffi_prep_cif(
 139                         &data->signature,
 140                         psi_ffi_abi(data->impl->decl->abi->convention),
 141                         c,
 142                         psi_ffi_decl_arg_type(data->impl->decl->func),
 143                         data->params);
 144         ZEND_ASSERT(FFI_OK == rc);
 145
 146         data->closure = psi_ffi_closure_alloc(sizeof(ffi_closure), &data->code);
 147         ZEND_ASSERT(data->closure != NULL);
 148 #if PSI_HAVE_FFI_PREP_CLOSURE_LOC
 149         rc = ffi_prep_closure_loc(
 150                         data->closure,
 151                         &context->signature,
 152                         handler,
 153                         data,
 154                         data->code);
 155         ZEND_ASSERT(FFI_OK == rc);
 156 #elif PSI_HAVE_FFI_PREP_CLOSURE
 157         rc = ffi_prep_closure(data->code, &context->signature, handler, data);
 158         ZEND_ASSERT(FFI_OK == rc);
 159 #else
 160 # error "Neither ffi_prep_closure() nor ffi_prep_closure_loc() available"
 161 #endif
 162
 163         context->data.list = realloc(context->data.list, ++context->data.count * sizeof(*context->data.list));
 164         context->data.list[context->data.count-1] = data;
 165
 166         return data;
 167 }
 168
 169 static inline void PSI_LibffiDataFree(PSI_LibffiData *data) {
 170         psi_ffi_closure_free(data->closure);
 171         free(data->arginfo);
 172         free(data);
 173 }
 174
 175 static inline PSI_LibffiContext *PSI_LibffiContextInit(PSI_LibffiContext *L) {
 176         ffi_status rc;
 177
 178         if (!L) {
 179                 L = malloc(sizeof(*L));
 180         }
 181         memset(L, 0, sizeof(*L));
 182
 183         L->params[0] = &ffi_type_pointer;
 184         L->params[1] = &ffi_type_pointer;
 185         rc = ffi_prep_cif(&L->signature, FFI_DEFAULT_ABI, 2, &ffi_type_void, L->params);
 186         ZEND_ASSERT(rc == FFI_OK);
 187
 188         return L;
 189 }
 190
 191 static inline void PSI_LibffiContextDtor(PSI_LibffiContext *L) {
 192         size_t i;
 193
 194         for (i = 0; i < L->data.count; ++i) {
 195                 PSI_LibffiDataFree(L->data.list[i]);
 196         }
 197         if (L->data.list) {
 198                 free(L->data.list);
 199         }
 200 }
 201
 202 static inline void PSI_LibffiContextFree(PSI_LibffiContext **L) {
 203         if (*L) {
 204                 PSI_LibffiContextDtor(*L);
 205                 free(*L);
 206                 *L = NULL;
 207         }
 208 }
 209
 210 static void handler(ffi_cif *_sig, void *_result, void **_args, void *_data)
 211 {
 212         PSI_LibffiData *data = _data;
 213         size_t i;
 214         void **arg_ptr = NULL, **arg_prm = NULL;
 215         impl_val ret_val;
 216
 217         if (SUCCESS != psi_parse_args(*(zend_execute_data **)_args[0], data->impl)) {
 218                 return;
 219         }
 220
 221         if (data->impl->decl->args) {
 222                 arg_ptr = malloc(data->impl->decl->args->count * sizeof(*arg_ptr));
 223                 arg_prm = malloc(data->impl->decl->args->count * sizeof(*arg_prm));
 224
 225                 for (i = 0; i < data->impl->decl->args->count; ++i) {
 226                         decl_arg *darg = data->impl->decl->args->args[i];
 227
 228                         arg_ptr[i] = psi_do_let(darg);
 229                         arg_prm[i] = (darg->let->val && darg->let->val->is_reference)
 230                                         ? &arg_ptr[i] : arg_ptr[i];
 231
 232                         darg->let->ptr = arg_ptr[i];
 233                 }
 234         }
 235
 236         ffi_call(&data->signature, FFI_FN(data->impl->decl->dlptr), &ret_val, arg_prm);
 237
 238         psi_do_return(data->impl, &ret_val, *(zval **)_args[1]);
 239
 240         for (i = 0; i < data->impl->stmts->set.count; ++i) {
 241                 set_stmt *set = data->impl->stmts->set.list[i];
 242
 243                 if (set->arg->_zv) {
 244                         psi_do_set(set->arg->_zv, set->val->func, set->val->vars);
 245                 }
 246         }
 247
 248         for (i = 0; i < data->impl->stmts->fre.count; ++i) {
 249                 free_stmt *fre = data->impl->stmts->fre.list[i];
 250
 251                 psi_do_free(fre);
 252         }
 253
 254         psi_do_clean(data->impl);
 255
 256         if (arg_ptr) {
 257                 free(arg_ptr);
 258         }
 259         if (arg_prm) {
 260                 free(arg_prm);
 261         }
 262 }
 263
 264 static void init(PSI_Context *C)
 265 {
 266         C->context = PSI_LibffiContextInit(NULL);
 267 }
 268
 269 static void dtor(PSI_Context *C)
 270 {
 271         PSI_LibffiContextFree((void *) &C->context);
 272 }
 273
 274 static zend_function_entry *compile(PSI_Context *C, PSI_Data *D)
 275 {
 276         size_t i, j = 0;
 277         zend_function_entry *zfe = calloc(D->impls->count + 1, sizeof(*zfe));
 278         PSI_LibffiContext *ctx = C->context;
 279
 280         for (i = 0; i < D->impls->count; ++i) {
 281                 zend_function_entry *zf = &zfe[j];
 282                 PSI_LibffiData *data;
 283
 284                 if (!D->impls->list[i]->decl) {
 285                         continue;
 286                 }
 287
 288                 data = PSI_LibffiDataAlloc(ctx, D->impls->list[i]);
 289                 zf->fname = D->impls->list[i]->func->name + (D->impls->list[i]->func->name[0] == '\\');
 290                 zf->num_args = D->impls->list[i]->func->args->count;
 291                 zf->handler = data->code;
 292                 zf->arg_info = data->arginfo;
 293                 ++j;
 294         }
 295
 296         return zfe;
 297 }
 298
 299 static PSI_ContextOps ops = {
 300         init,
 301         dtor,
 302         compile,
 303 };
 304
 305 PSI_ContextOps *PSI_Libffi(void)
 306 {
 307         return &ops;
 308 }