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 #ifndef PSI_HAVE_FFI_CLOSURE_ALLOC
   8 # include <unistd.h>
   9 # include <sys/mman.h>
  10 #endif
  11
  12 static void handler(ffi_cif *signature, void *_result, void **_args, void *_data);
  13
  14 static inline ffi_abi psi_ffi_abi(const char *convention) {
  15         return FFI_DEFAULT_ABI;
  16 }
  17 static inline ffi_type *psi_ffi_type(token_t t) {
  18         switch (t) {
  19         default:
  20                 ZEND_ASSERT(0);
  21                 /* no break */
  22         case PSI_T_VOID:
  23                 return &ffi_type_void;
  24         case PSI_T_SINT8:
  25                 return &ffi_type_sint8;
  26         case PSI_T_UINT8:
  27                 return &ffi_type_uint8;
  28         case PSI_T_SINT16:
  29                 return &ffi_type_sint16;
  30         case PSI_T_UINT16:
  31                 return &ffi_type_uint16;
  32         case PSI_T_SINT32:
  33                 return &ffi_type_sint32;
  34         case PSI_T_UINT32:
  35                 return &ffi_type_uint32;
  36         case PSI_T_SINT64:
  37                 return &ffi_type_sint64;
  38         case PSI_T_UINT64:
  39                 return &ffi_type_uint64;
  40         case PSI_T_BOOL:
  41                 return &ffi_type_uchar;
  42         case PSI_T_CHAR:
  43                 return &ffi_type_schar;
  44         case PSI_T_SHORT:
  45                 return &ffi_type_sshort;
  46         case PSI_T_INT:
  47                 return &ffi_type_sint;
  48         case PSI_T_LONG:
  49                 return &ffi_type_slong;
  50         case PSI_T_FLOAT:
  51                 return &ffi_type_float;
  52         case PSI_T_DOUBLE:
  53                 return &ffi_type_double;
  54         }
  55 }
  56 static inline ffi_type *psi_ffi_decl_type(decl_type *type) {
  57         return psi_ffi_type(real_decl_type(type)->type);
  58 }
  59 static inline ffi_type *psi_ffi_decl_arg_type(decl_arg *darg) {
  60         if (darg->var->pointer_level) {
  61                 return &ffi_type_pointer;
  62         } else {
  63                 return psi_ffi_decl_type(darg->type);
  64         }
  65 }
  66
  67 typedef struct PSI_LibffiContext {
  68         ffi_cif signature;
  69         ffi_type *params[2];
  70         struct {
  71                 struct PSI_LibffiData **list;
  72                 size_t count;
  73         } data;
  74 } PSI_LibffiContext;
  75
  76 typedef struct PSI_LibffiData {
  77         PSI_LibffiContext *context;
  78         impl *impl;
  79         zend_internal_arg_info *arginfo;
  80         void *code;
  81         ffi_closure *closure;
  82         ffi_cif signature;
  83         ffi_type *params[1];
  84 } PSI_LibffiData;
  85
  86 static inline PSI_LibffiData *PSI_LibffiDataAlloc(PSI_LibffiContext *context, impl *impl) {
  87         ffi_status rc;
  88         size_t i, c = impl->decl->args->count;
  89         PSI_LibffiData *data = malloc(sizeof(*data) + c * sizeof(ffi_type *));
  90
  91         data->context = context;
  92         data->impl = impl;
  93         data->arginfo = psi_internal_arginfo(impl);
  94         for (i = 0; i < c; ++i) {
  95                 data->params[i] = psi_ffi_decl_arg_type(impl->decl->args->args[i]);
  96         }
  97         data->params[c] = NULL;
  98
  99         rc = ffi_prep_cif(
 100                         &data->signature,
 101                         psi_ffi_abi(data->impl->decl->abi->convention),
 102                         c,
 103                         psi_ffi_decl_arg_type(data->impl->decl->func),
 104                         data->params);
 105         ZEND_ASSERT(FFI_OK == rc);
 106
 107 #ifdef PSI_HAVE_FFI_CLOSURE_ALLOC
 108         data->closure = ffi_closure_alloc(sizeof(ffi_closure), &data->code);
 109         rc = ffi_prep_closure_loc(
 110                         data->closure,
 111                         &context->signature,
 112                         handler,
 113                         data,
 114                         data->code);
 115         ZEND_ASSERT(FFI_OK == rc);
 116 #else
 117         i = getpagesize();
 118         data->closure = malloc(sizeof(ffi_closure) + i);
 119         data->code = (void *) (((intptr_t) data->closure + i - 1) & ~((intptr_t) i - 1));
 120         rc = mprotect(data->code, sizeof(ffi_closure), PROT_EXEC|PROT_WRITE);
 121         ZEND_ASSERT(rc == 0);
 122         rc = ffi_prep_closure(data->code, &context->signature, handler, data);
 123         ZEND_ASSERT(FFI_OK == rc);
 124 #endif
 125
 126         context->data.list = realloc(context->data.list, ++context->data.count * sizeof(*context->data.list));
 127         context->data.list[context->data.count-1] = data;
 128
 129         return data;
 130 }
 131
 132 static inline void PSI_LibffiDataFree(PSI_LibffiData *data) {
 133         free(data->arginfo);
 134 #ifdef PSI_HAVE_FFI_CLOSURE_FREE
 135         ffi_closure_free(data->closure);
 136 #else
 137         free(data->closure);
 138 #endif
 139         free(data);
 140 }
 141
 142 static inline PSI_LibffiContext *PSI_LibffiContextInit(PSI_LibffiContext *L) {
 143         ffi_status rc;
 144
 145         if (!L) {
 146                 L = malloc(sizeof(*L));
 147         }
 148         memset(L, 0, sizeof(*L));
 149
 150         L->params[0] = &ffi_type_pointer;
 151         L->params[1] = &ffi_type_pointer;
 152         rc = ffi_prep_cif(&L->signature, FFI_DEFAULT_ABI, 2, &ffi_type_void, L->params);
 153         ZEND_ASSERT(rc == FFI_OK);
 154
 155         return L;
 156 }
 157
 158 static inline void PSI_LibffiContextDtor(PSI_LibffiContext *L) {
 159         size_t i;
 160
 161         for (i = 0; i < L->data.count; ++i) {
 162                 PSI_LibffiDataFree(L->data.list[i]);
 163         }
 164         if (L->data.list) {
 165                 free(L->data.list);
 166         }
 167 }
 168
 169 static inline void PSI_LibffiContextFree(PSI_LibffiContext **L) {
 170         if (*L) {
 171                 PSI_LibffiContextDtor(*L);
 172                 free(*L);
 173                 *L = NULL;
 174         }
 175 }
 176
 177 static void handler(ffi_cif *_sig, void *_result, void **_args, void *_data)
 178 {
 179         PSI_LibffiData *data = _data;
 180         size_t i;
 181         void **arg_ptr = NULL, **arg_prm = NULL;
 182         impl_val ret_val;
 183
 184         if (SUCCESS != psi_parse_args(*(zend_execute_data **)_args[0], data->impl)) {
 185                 return;
 186         }
 187
 188         if (data->impl->decl->args->count) {
 189                 arg_ptr = malloc(data->impl->decl->args->count * sizeof(*arg_ptr));
 190                 arg_prm = malloc(data->impl->decl->args->count * sizeof(*arg_prm));
 191
 192                 for (i = 0; i < data->impl->decl->args->count; ++i) {
 193                         decl_arg *darg = data->impl->decl->args->args[i];
 194
 195                         arg_ptr[i] = psi_do_let(darg);
 196                         arg_prm[i] = darg->let->val->is_reference ? &arg_ptr[i] : arg_ptr[i];
 197
 198                         darg->let->ptr = arg_ptr[i];
 199                 }
 200         }
 201
 202         ffi_call(&data->signature, FFI_FN(data->impl->decl->dlptr), &ret_val, arg_prm);
 203
 204         psi_do_return(data->impl, &ret_val, *(zval **)_args[1]);
 205
 206         for (i = 0; i < data->impl->stmts->set.count; ++i) {
 207                 set_stmt *set = data->impl->stmts->set.list[i];
 208
 209                 psi_do_set(set->arg->_zv, set->val->func, set->val->vars);
 210         }
 211
 212         for (i = 0; i < data->impl->stmts->fre.count; ++i) {
 213                 free_stmt *fre = data->impl->stmts->fre.list[i];
 214
 215                 psi_do_free(fre);
 216         }
 217
 218         psi_do_clean(data->impl);
 219
 220         if (arg_ptr) {
 221                 free(arg_ptr);
 222         }
 223         if (arg_prm) {
 224                 free(arg_prm);
 225         }
 226 }
 227
 228 static void init(PSI_Context *C)
 229 {
 230         C->context = PSI_LibffiContextInit(NULL);
 231 }
 232
 233 static void dtor(PSI_Context *C)
 234 {
 235         PSI_LibffiContextFree((void *) &C->context);
 236 }
 237
 238 static zend_function_entry *compile(PSI_Context *C, PSI_Data *D)
 239 {
 240         size_t i, j = 0;
 241         zend_function_entry *zfe = calloc(D->impls->count + 1, sizeof(*zfe));
 242         PSI_LibffiContext *ctx = C->context;
 243
 244         for (i = 0; i < D->impls->count; ++i) {
 245                 zend_function_entry *zf = &zfe[j];
 246                 PSI_LibffiData *data;
 247
 248                 if (!D->impls->list[i]->decl) {
 249                         continue;
 250                 }
 251
 252                 data = PSI_LibffiDataAlloc(ctx, D->impls->list[i]);
 253                 zf->fname = D->impls->list[i]->func->name + (D->impls->list[i]->func->name[0] == '\\');
 254                 zf->num_args = D->impls->list[i]->func->args->count;
 255                 zf->handler = data->code;
 256                 zf->arg_info = data->arginfo;
 257                 ++j;
 258         }
 259
 260         return zfe;
 261 }
 262
 263 static PSI_ContextOps ops = {
 264         init,
 265         dtor,
 266         compile,
 267 };
 268
 269 PSI_ContextOps *PSI_Libffi(void)
 270 {
 271         return &ops;
 272 }