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[m6w6/ext-psi] / src / libffi.c

diff --git a/src/libffi.c b/src/libffi.c
index 1dbc08010023f1e44d53db044ffb83f45eacf853..2c68fbf0ee4bb34834dd51b910bdb1ec39e3f3e5 100644 (file)
--- a/src/libffi.c
+++ b/src/libffi.c
@@ -4,6 +4,43 @@
 
 #include <ffi.h>
 
+#ifndef PSI_HAVE_FFI_CLOSURE_ALLOC
+# if HAVE_UNISTD_H
+#  include <unistd.h>
+# endif
+# if HAVE_SYS_MMAN_H
+#  include <sys/mman.h>
+#  ifndef MAP_ANONYMOUS
+#   define MAP_ANONYMOUS MAP_ANON
+#  endif
+# endif
+#endif
+
+static void *psi_ffi_closure_alloc(size_t s, void **code)
+{
+#ifdef PSI_HAVE_FFI_CLOSURE_ALLOC
+       return ffi_closure_alloc(s, code);
+#elif HAVE_MMAP
+       *code = mmap(NULL, s, PROT_EXEC|PROT_WRITE|PROT_READ,
+                       MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
+       if (MAP_FAILED == *code) {
+               return NULL;
+       }
+       return *code;
+#else
+       return NULL;
+#endif
+}
+
+static void psi_ffi_closure_free(void *c)
+{
+#ifdef PSI_HAVE_FFI_CLOSURE_ALLOC
+       ffi_closure_free(c);
+#elif HAVE_MMAP
+       munmap(c, sizeof(ffi_closure));
+#endif
+}
+
 static void handler(ffi_cif *signature, void *_result, void **_args, void *_data);
 
 static inline ffi_abi psi_ffi_abi(const char *convention) {
@@ -98,7 +135,10 @@ static inline PSI_LibffiData *PSI_LibffiDataAlloc(PSI_LibffiContext *context, im
                        psi_ffi_decl_arg_type(data->impl->decl->func),
                        data->params);
        ZEND_ASSERT(FFI_OK == rc);
-       data->closure = ffi_closure_alloc(sizeof(ffi_closure), &data->code);
+
+       data->closure = psi_ffi_closure_alloc(sizeof(ffi_closure), &data->code);
+       ZEND_ASSERT(data->closure != NULL);
+#if PSI_HAVE_FFI_PREP_CLOSURE_LOC
        rc = ffi_prep_closure_loc(
                        data->closure,
                        &context->signature,
@@ -106,6 +146,12 @@ static inline PSI_LibffiData *PSI_LibffiDataAlloc(PSI_LibffiContext *context, im
                        data,
                        data->code);
        ZEND_ASSERT(FFI_OK == rc);
+#elif PSI_HAVE_FFI_PREP_CLOSURE
+       rc = ffi_prep_closure(data->code, &context->signature, handler, data);
+       ZEND_ASSERT(FFI_OK == rc);
+#else
+# error "Neither ffi_prep_closure() nor ffi_prep_closure_loc() available"
+#endif
 
        context->data.list = realloc(context->data.list, ++context->data.count * sizeof(*context->data.list));
        context->data.list[context->data.count-1] = data;
@@ -114,8 +160,8 @@ static inline PSI_LibffiData *PSI_LibffiDataAlloc(PSI_LibffiContext *context, im
 }
 
 static inline void PSI_LibffiDataFree(PSI_LibffiData *data) {
+       psi_ffi_closure_free(data->closure);
        free(data->arginfo);
-       ffi_closure_free(data->closure);
        free(data);
 }
 
@@ -173,7 +219,8 @@ static void handler(ffi_cif *_sig, void *_result, void **_args, void *_data)
                        decl_arg *darg = data->impl->decl->args->args[i];
 
                        arg_ptr[i] = psi_do_let(darg);
-                       arg_prm[i] = darg->let->val->is_reference ? &arg_ptr[i] : arg_ptr[i];
+                       arg_prm[i] = (darg->let->val && darg->let->val->is_reference)
+                                       ? &arg_ptr[i] : arg_ptr[i];
 
                        darg->let->ptr = arg_ptr[i];
                }