X-Git-Url: https://git.m6w6.name/?p=m6w6%2Fext-psi;a=blobdiff_plain;f=src%2Flibffi.c;h=fe2bc614b2c2bc21617cc0c73dcf4120a3cad445;hp=eb5b2b518aa800bf8f9922d50cdd1d66e833785c;hb=f76cbab7698c988217d56a96f3ef68005cddd5ec;hpb=f6b2422d4a9cb0424412a4077241cfd5bcb9ebeb

diff --git a/src/libffi.c b/src/libffi.c
index eb5b2b5..fe2bc61 100644
--- a/src/libffi.c
+++ b/src/libffi.c
@@ -1,295 +1,614 @@
+/*******************************************************************************
+ Copyright (c) 2016, Michael Wallner <mike@php.net>.
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+
+     * Redistributions of source code must retain the above copyright notice,
+       this list of conditions and the following disclaimer.
+     * Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+ FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*******************************************************************************/
+
+#include "php_psi_stdinc.h"
+#include "context.h"
+#include "call.h"
 #include "php.h"
-#include "php_psi.h"
-#include "libffi.h"
-
-#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>
-# 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
-}
+#ifdef HAVE_LIBFFI
 
-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));
+#include "libffi_compat.h"
+
+#if HAVE_INT128
+static ffi_type *ffi_type_sint128;
+static ffi_type *ffi_type_uint128;
 #endif
-}
 
-static void handler(ffi_cif *signature, void *_result, void **_args, void *_data);
+struct psi_ffi_context {
+	ffi_cif signature;
+	ffi_type *params[2];
+};
 
-static inline ffi_abi psi_ffi_abi(const char *convention) {
-	return FFI_DEFAULT_ABI;
-}
-static inline ffi_type *psi_ffi_type(token_t t) {
+struct psi_ffi_callback_info {
+	struct psi_ffi_impl_info *impl_info;
+	struct psi_let_exp *let_exp;
+
+	void *code;
+	ffi_closure *closure;
+};
+
+struct psi_ffi_decl_info {
+	ffi_cif signature;
+	struct psi_ffi_struct_info *rv_array;
+	ffi_type *params[1];
+};
+
+struct psi_ffi_extvar_info {
+	struct {
+		ffi_cif signature;
+		void *code;
+		ffi_closure *closure;
+	} get;
+	struct {
+		ffi_cif signature;
+		ffi_type *params[1];
+		void *code;
+		ffi_closure *closure;
+	} set;
+};
+
+struct psi_ffi_impl_info {
+	struct psi_context *context;
+	struct psi_call_frame *frame;
+
+	void *code;
+	ffi_closure *closure;
+};
+
+struct psi_ffi_struct_info {
+	ffi_type strct;
+	struct psi_plist *eles;
+};
+
+static inline ffi_type *psi_ffi_token_type(token_t t)
+{
 	switch (t) {
 	default:
-		ZEND_ASSERT(0);
+		assert(0);
 		/* no break */
 	case PSI_T_VOID:
 		return &ffi_type_void;
-	case PSI_T_SINT8:
+	case PSI_T_INT8:
 		return &ffi_type_sint8;
 	case PSI_T_UINT8:
 		return &ffi_type_uint8;
-	case PSI_T_SINT16:
+	case PSI_T_INT16:
 		return &ffi_type_sint16;
 	case PSI_T_UINT16:
 		return &ffi_type_uint16;
-	case PSI_T_SINT32:
+	case PSI_T_INT32:
 		return &ffi_type_sint32;
 	case PSI_T_UINT32:
 		return &ffi_type_uint32;
-	case PSI_T_SINT64:
+	case PSI_T_INT64:
 		return &ffi_type_sint64;
 	case PSI_T_UINT64:
 		return &ffi_type_uint64;
+#if HAVE_INT128
+	case PSI_T_INT128:
+		return ffi_type_sint128;
+	case PSI_T_UINT128:
+		return ffi_type_uint128;
+#endif
 	case PSI_T_BOOL:
 		return &ffi_type_uchar;
-	case PSI_T_CHAR:
-		return &ffi_type_schar;
-	case PSI_T_SHORT:
-		return &ffi_type_sshort;
-	case PSI_T_INT:
+	case PSI_T_ENUM:
 		return &ffi_type_sint;
-	case PSI_T_LONG:
-		return &ffi_type_slong;
 	case PSI_T_FLOAT:
 		return &ffi_type_float;
 	case PSI_T_DOUBLE:
 		return &ffi_type_double;
+#ifdef HAVE_LONG_DOUBLE
+	case PSI_T_LONG_DOUBLE:
+		return &ffi_type_longdouble;
+#endif
+	case PSI_T_POINTER:
+	case PSI_T_FUNCTION:
+		return &ffi_type_pointer;
 	}
 }
-static inline ffi_type *psi_ffi_decl_type(decl_type *type) {
-	return psi_ffi_type(real_decl_type(type)->type);
-}
-static inline ffi_type *psi_ffi_decl_arg_type(decl_arg *darg) {
-	if (darg->var->pointer_level) {
+static inline ffi_type *psi_ffi_impl_type(token_t impl_type)
+{
+	switch (impl_type) {
+	case PSI_T_BOOL:
+		return &ffi_type_sint8;
+	case PSI_T_INT:
+		return &ffi_type_sint64;
+	case PSI_T_STRING:
 		return &ffi_type_pointer;
-	} else {
-		return psi_ffi_decl_type(darg->type);
+	case PSI_T_FLOAT:
+	case PSI_T_DOUBLE:
+		return &ffi_type_double;
+	EMPTY_SWITCH_DEFAULT_CASE();
 	}
+	return NULL;
 }
 
-typedef struct PSI_LibffiContext {
-	ffi_cif signature;
-	ffi_type *params[2];
-	struct {
-		struct PSI_LibffiData **list;
-		size_t count;
-	} data;
-} PSI_LibffiContext;
-
-typedef struct PSI_LibffiData {
-	PSI_LibffiContext *context;
-	impl *impl;
-	zend_internal_arg_info *arginfo;
-	void *code;
-	ffi_closure *closure;
-	ffi_cif signature;
-	ffi_type *params[1];
-} PSI_LibffiData;
+static void psi_ffi_type_free(ffi_type **typ_ptr)
+{
+	pefree(*typ_ptr, 1);
+}
 
-static inline PSI_LibffiData *PSI_LibffiDataAlloc(PSI_LibffiContext *context, impl *impl) {
-	ffi_status rc;
-	size_t i, c = impl->decl->args->count;
-	PSI_LibffiData *data = malloc(sizeof(*data) + c * sizeof(ffi_type *));
-
-	data->context = context;
-	data->impl = impl;
-	data->arginfo = psi_internal_arginfo(impl);
-	for (i = 0; i < c; ++i) {
-		data->params[i] = psi_ffi_decl_arg_type(impl->decl->args->args[i]);
-	}
-	data->params[c] = NULL;
-
-	rc = ffi_prep_cif(
-			&data->signature,
-			psi_ffi_abi(data->impl->decl->abi->convention),
-			c,
-			psi_ffi_decl_arg_type(data->impl->decl->func),
-			data->params);
-	ZEND_ASSERT(FFI_OK == rc);
-
-	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,
-			handler,
-			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"
+static inline ffi_abi psi_ffi_abi(zend_string *convention) {
+	if (FFI_LAST_ABI - 2 != FFI_FIRST_ABI) {
+#ifdef HAVE_FFI_STDCALL
+		if (zend_string_equals_literal(convention, "stdcall")) {
+			return FFI_STDCALL;
+		}
+#endif
+#ifdef HAVE_FFI_FASTCALL
+		if (zend_string_equals_literal(convention, "fastcall")) {
+			return FFI_FASTCALL;
+		}
 #endif
+	}
+	return FFI_DEFAULT_ABI;
+}
+
+static void psi_ffi_handler(ffi_cif *sig, void *result, void **args, void *data)
+{
+	struct psi_impl *impl = data;
+	struct psi_ffi_impl_info *info = impl->info;
+
+	psi_context_call(info->context, *(zend_execute_data **)args[0], *(zval **)args[1], impl);
+}
+
+static void psi_ffi_callback(ffi_cif *sig, void *result, void **args, void *data)
+{
+	struct psi_ffi_callback_info *cb_info = data;
+	struct psi_call_frame_callback cb_data;
+
+	assert(cb_info->impl_info->frame);
 
-	context->data.list = realloc(context->data.list, ++context->data.count * sizeof(*context->data.list));
-	context->data.list[context->data.count-1] = data;
+	cb_data.cb = cb_info->let_exp;
+	cb_data.argc = sig->nargs;
+	cb_data.argv = args;
+	cb_data.rval = result;
 
-	return data;
+	psi_call_frame_do_callback(cb_info->impl_info->frame, &cb_data);
 }
 
-static inline void PSI_LibffiDataFree(PSI_LibffiData *data) {
-	psi_ffi_closure_free(data->closure);
-	free(data->arginfo);
-	free(data);
+static bool psi_ffi_load()
+{
+#if HAVE_INT128
+	ffi_type *i128, *u128;
+
+	i128 = pecalloc(1, 3*sizeof(ffi_type), 1);
+	i128->type = FFI_TYPE_STRUCT;
+	i128->size = 0;
+	i128->elements = (ffi_type **) (i128 + 1);
+	i128->elements[0] = &ffi_type_sint64;
+	i128->elements[1] = &ffi_type_sint64;
+
+	ffi_type_sint128 = i128;
+
+	u128 = pecalloc(1, 3*sizeof(ffi_type), 1);
+	u128->type = FFI_TYPE_STRUCT;
+	u128->size = 0;
+	u128->elements = (ffi_type **) (u128 + 1);
+	u128->elements[0] = &ffi_type_uint64;
+	u128->elements[1] = &ffi_type_uint64;
+
+	ffi_type_uint128 = u128;
+#endif
+	return true;
+}
+
+static void psi_ffi_free()
+{
+#if HAVE_INT128
+	free(ffi_type_sint128);
+	free(ffi_type_uint128);
+#endif
 }
 
-static inline PSI_LibffiContext *PSI_LibffiContextInit(PSI_LibffiContext *L) {
+static bool psi_ffi_init(struct psi_context *C)
+{
 	ffi_status rc;
+	struct psi_ffi_context *context = pecalloc(1, sizeof(*context), 1);
+	ffi_abi abi = FFI_DEFAULT_ABI;
+
+#if HAVE_FFI_FASTCALL
+	abi = FFI_FASTCALL;
+#endif
+
+	context->params[0] = &ffi_type_pointer;
+	context->params[1] = &ffi_type_pointer;
+	rc = ffi_prep_cif(&context->signature, abi, 2, &ffi_type_void,
+			context->params);
 
-	if (!L) {
-		L = malloc(sizeof(*L));
+	if (FFI_OK != rc) {
+		pefree(context, 1);
+		return false;
 	}
-	memset(L, 0, sizeof(*L));
 
-	L->params[0] = &ffi_type_pointer;
-	L->params[1] = &ffi_type_pointer;
-	rc = ffi_prep_cif(&L->signature, FFI_DEFAULT_ABI, 2, &ffi_type_void, L->params);
-	ZEND_ASSERT(rc == FFI_OK);
+	C->context = context;
+	return true;
+}
 
-	return L;
+static void psi_ffi_dtor(struct psi_context *C)
+{
+	if (C->context) {
+		pefree(C->context, 1);
+		C->context = NULL;
+	}
 }
 
-static inline void PSI_LibffiContextDtor(PSI_LibffiContext *L) {
-	size_t i;
+static bool psi_ffi_composite_init(struct psi_context *C,
+		struct psi_decl_arg *darg)
+{
+	struct psi_ffi_struct_info *info;
 
-	for (i = 0; i < L->data.count; ++i) {
-		PSI_LibffiDataFree(L->data.list[i]);
+	if (darg->engine.type) {
+		return true;
 	}
-	if (L->data.list) {
-		free(L->data.list);
+
+	info = pecalloc(1, sizeof(*info), 1);
+	info->eles = psi_plist_init((psi_plist_dtor) psi_ffi_type_free);
+
+	psi_context_composite_type_elements(C, darg, &info->eles);
+
+	/* add terminating NULL; libffi structs do not have an element count */
+	{
+		void *null_ptr = NULL;
+		info->eles = psi_plist_add(info->eles, &null_ptr);
 	}
+
+	info->strct.type = FFI_TYPE_STRUCT;
+	info->strct.alignment = 0;
+	info->strct.size = 0;
+	info->strct.elements = (ffi_type **) psi_plist_eles(info->eles);
+
+	darg->engine.info = info;
+	darg->engine.type = &info->strct;
+
+	return true;
 }
 
-static inline void PSI_LibffiContextFree(PSI_LibffiContext **L) {
-	if (*L) {
-		PSI_LibffiContextDtor(*L);
-		free(*L);
-		*L = NULL;
+static void psi_ffi_composite_dtor(struct psi_context *C,
+		struct psi_decl_arg *darg)
+{
+	struct psi_ffi_struct_info *info = darg->engine.info;
+
+	if (info) {
+		darg->engine.info = NULL;
+		darg->engine.type = NULL;
+
+		psi_plist_free(info->eles);
+		pefree(info, 1);
 	}
 }
 
-static void handler(ffi_cif *_sig, void *_result, void **_args, void *_data)
+static void psi_ffi_extvar_get(ffi_cif *sig, void *result, void **args, void *data) {
+	struct psi_decl_extvar *evar = data;
+
+	psi_decl_extvar_get(evar, result);
+}
+
+static void psi_ffi_extvar_set(ffi_cif *sig, void *result, void **args, void *data) {
+	struct psi_decl_extvar *evar = data;
+
+	psi_decl_extvar_set(evar, args[0]);
+}
+
+static bool psi_ffi_decl_init(struct psi_context *, struct psi_decl *);
+
+static bool psi_ffi_extvar_init(struct psi_context *C,
+		struct psi_decl_extvar *evar)
 {
-	PSI_LibffiData *data = _data;
-	size_t i;
-	void **arg_ptr = NULL, **arg_prm = NULL;
-	impl_val ret_val;
+	struct psi_ffi_extvar_info *info = pecalloc(1, sizeof(*info), 1);
+	ffi_status rc;
 
-	if (SUCCESS != psi_parse_args(*(zend_execute_data **)_args[0], data->impl)) {
-		return;
+	evar->info = info;
+
+	psi_ffi_decl_init(C, evar->getter);
+	psi_ffi_decl_init(C, evar->setter);
+
+	rc = ffi_prep_cif(&info->get.signature, FFI_DEFAULT_ABI, 0,
+			psi_context_decl_arg_call_type(C, evar->getter->func), NULL);
+	if (FFI_OK != rc) {
+		return false;
+	}
+	rc = psi_ffi_prep_closure(&info->get.closure, &info->get.code,
+			&info->get.signature, psi_ffi_extvar_get, evar);
+	if (FFI_OK != rc) {
+		return false;
 	}
 
-	if (data->impl->decl->args->count) {
-		arg_ptr = malloc(data->impl->decl->args->count * sizeof(*arg_ptr));
-		arg_prm = malloc(data->impl->decl->args->count * sizeof(*arg_prm));
+	info->set.params[0] = psi_context_decl_arg_call_type(C, evar->arg);
+	rc = ffi_prep_cif(&info->set.signature, FFI_DEFAULT_ABI, 1,
+			&ffi_type_void, info->set.params);
+	if (FFI_OK != rc) {
+		return false;
+	}
+	rc = psi_ffi_prep_closure(&info->set.closure, &info->set.code,
+			&info->set.signature, psi_ffi_extvar_set, evar);
+	if (FFI_OK != rc) {
+		return false;
+	}
 
-		for (i = 0; i < data->impl->decl->args->count; ++i) {
-			decl_arg *darg = data->impl->decl->args->args[i];
+	evar->getter->sym = info->get.code;
+	evar->setter->sym = info->set.code;
 
-			arg_ptr[i] = psi_do_let(darg);
-			arg_prm[i] = darg->let->val->is_reference ? &arg_ptr[i] : arg_ptr[i];
+	return true;
+}
+
+static void psi_ffi_extvar_dtor(struct psi_context *C,
+		struct psi_decl_extvar *evar) {
+	if (evar->info) {
+		pefree(evar->info, 1);
+		evar->info = NULL;
+	}
+}
+
+static bool psi_ffi_decl_init(struct psi_context *C, struct psi_decl *decl)
+{
+	if (!decl->info) {
+		int rc;
+		size_t i, c = psi_plist_count(decl->args);
+		struct psi_decl_arg *arg;
+		struct psi_ffi_decl_info *info = pecalloc(1,
+				sizeof(*info) + 2 * c * sizeof(void *), 1);
 
-			darg->let->ptr = arg_ptr[i];
+		decl->info = info;
+
+		for (i = 0; psi_plist_get(decl->args, i, &arg); ++i) {
+			info->params[i] = psi_context_decl_arg_call_type(C, arg);
+		}
+		info->params[c] = NULL;
+
+		rc = ffi_prep_cif(&info->signature, psi_ffi_abi(decl->abi->convention),
+				c, psi_context_decl_arg_call_type(C, decl->func), info->params);
+
+		if (FFI_OK != rc) {
+			pefree(info, 1);
+			decl->info = NULL;
+			return false;
 		}
 	}
 
-	ffi_call(&data->signature, FFI_FN(data->impl->decl->dlptr), &ret_val, arg_prm);
+	return true;
+}
 
-	psi_do_return(data->impl, &ret_val, *(zval **)_args[1]);
+static void psi_ffi_decl_dtor(struct psi_context *C,
+		struct psi_decl *decl)
+{
+	if (decl->info) {
+		pefree(decl->info, 1);
+		decl->info = NULL;
+	}
+}
 
-	for (i = 0; i < data->impl->stmts->set.count; ++i) {
-		set_stmt *set = data->impl->stmts->set.list[i];
+static bool psi_ffi_impl_init(struct psi_context *C,
+		struct psi_impl *impl, zif_handler *zh)
+{
+	struct psi_ffi_context *context = C->context;
+	struct psi_ffi_impl_info *info = pecalloc(1, sizeof(*info), 1);
+	ffi_status rc;
 
-		psi_do_set(set->arg->_zv, set->val->func, set->val->vars);
+	impl->info = info;
+	info->context = C;
+
+	rc = psi_ffi_prep_closure(&info->closure, &info->code,
+			&context->signature, psi_ffi_handler, impl);
+
+	if (FFI_OK != rc) {
+		goto failure;
 	}
 
-	for (i = 0; i < data->impl->stmts->fre.count; ++i) {
-		free_stmt *fre = data->impl->stmts->fre.list[i];
+	*zh = info->code;
+	return true;
+
+failure: ;
+	impl->info = NULL;
+	free(info);
+	return false;
+}
+
+static void psi_ffi_impl_dtor(struct psi_context *C, struct psi_impl *impl)
+{
+	struct psi_ffi_impl_info *info = impl->info;
 
-		psi_do_free(fre);
+	if (info) {
+		if (info->closure) {
+			psi_ffi_closure_free(info->closure);
+		}
+		free(info);
+		impl->info = NULL;
 	}
+}
+
+static bool psi_ffi_cb_init(struct psi_context *C,
+		struct psi_let_exp *exp, struct psi_impl *impl)
+{
+	struct psi_ffi_callback_info *cb_info;
+	struct psi_ffi_decl_info *decl_info;
+	ffi_status rc;
 
-	psi_do_clean(data->impl);
+	assert(exp->kind == PSI_LET_CALLBACK);
 
-	if (arg_ptr) {
-		free(arg_ptr);
+	if (!psi_ffi_decl_init(C, exp->data.callback->decl)) {
+		return false;
 	}
-	if (arg_prm) {
-		free(arg_prm);
+
+	cb_info = pecalloc(1, sizeof(*cb_info), 1);
+	cb_info->impl_info = impl->info;
+	cb_info->let_exp = exp;
+
+	decl_info = exp->data.callback->decl->info;
+	rc = psi_ffi_prep_closure(&cb_info->closure, &cb_info->code,
+			&decl_info->signature, psi_ffi_callback, cb_info);
+
+	if (FFI_OK != rc) {
+		free(cb_info);
+		return false;
 	}
+
+	assert(!exp->data.callback->decl->sym);
+	exp->data.callback->info = cb_info;
+	exp->data.callback->decl->sym = cb_info->code;
+
+	return true;
 }
 
-static void init(PSI_Context *C)
+static void psi_ffi_cb_dtor(struct psi_context *C,
+		struct psi_let_exp *let_exp, struct psi_impl *impl)
 {
-	C->context = PSI_LibffiContextInit(NULL);
+	assert(let_exp->kind == PSI_LET_CALLBACK);
+
+	psi_ffi_decl_dtor(C, let_exp->data.callback->decl);
+
+	if (let_exp->data.callback->info) {
+		struct psi_ffi_callback_info *info = let_exp->data.callback->info;
+
+		if (info->closure) {
+			psi_ffi_closure_free(info->closure);
+		}
+		pefree(info, 1);
+		let_exp->data.callback->info = NULL;
+	}
 }
 
-static void dtor(PSI_Context *C)
+static void psi_ffi_call(struct psi_call_frame *frame) {
+	struct psi_decl *decl = psi_call_frame_get_decl(frame);
+	struct psi_impl *impl = psi_call_frame_get_impl(frame);
+	struct psi_ffi_decl_info *decl_info = decl->info;
+	struct psi_ffi_impl_info *impl_info;
+	struct psi_call_frame *prev;
+
+	if (impl) {
+		impl_info = impl->info;
+		prev = impl_info->frame;
+		impl_info->frame = frame;
+	}
+	ffi_call(&decl_info->signature, FFI_FN(decl->sym),
+			psi_call_frame_get_rpointer(frame),
+			psi_call_frame_get_arg_pointers(frame));
+	if (impl) {
+		impl_info->frame = prev;
+	}
+}
+
+static void psi_ffi_call_va(struct psi_call_frame *frame) {
+	ffi_cif signature;
+	struct psi_call_frame *prev;
+	struct psi_decl *decl = psi_call_frame_get_decl(frame);
+	struct psi_impl *impl = psi_call_frame_get_impl(frame);
+	struct psi_ffi_decl_info *decl_info = decl->info;
+	struct psi_ffi_impl_info *impl_info;
+	size_t i, va_count, argc;
+	ffi_type **param_types;
+
+	argc = psi_plist_count(decl->args);
+	va_count = psi_call_frame_num_var_args(frame);
+	param_types = ecalloc(argc + va_count + 1, sizeof(ffi_type *));
+	memcpy(param_types, decl_info->params, argc * sizeof(ffi_type *));
+	for (i = 0; i < va_count; ++i) {
+		struct psi_call_frame_argument *frame_arg;
+
+		frame_arg = psi_call_frame_get_var_argument(frame, i);
+		param_types[argc + i] = psi_ffi_impl_type(frame_arg->va_type);
+	}
+
+	psi_ffi_prep_va(&decl_info->signature, &signature, argc, va_count, param_types);
+
+	if (impl) {
+		impl_info = impl->info;
+		prev = impl_info->frame;
+		impl_info->frame = frame;
+	}
+	ffi_call(&signature, FFI_FN(decl->sym),
+			psi_call_frame_get_rpointer(frame),
+			psi_call_frame_get_arg_pointers(frame));
+	if (impl) {
+		impl_info->frame = prev;
+	}
+
+	efree(param_types);
+}
+
+static void *psi_ffi_typeof_impl(struct psi_context *C, token_t impl_type)
+{
+	return psi_ffi_impl_type(impl_type);
+}
+
+static void *psi_ffi_typeof_decl(struct psi_context *C, token_t decl_type)
 {
-	PSI_LibffiContextFree((void *) &C->context);
+	return psi_ffi_token_type(decl_type);
 }
 
-static zend_function_entry *compile(PSI_Context *C, PSI_Data *D)
+static void *psi_ffi_copyof_type(struct psi_context *C, void *orig_type)
 {
-	size_t i, j = 0;
-	zend_function_entry *zfe = calloc(D->impls->count + 1, sizeof(*zfe));
-	PSI_LibffiContext *ctx = C->context;
+	ffi_type *type = pemalloc(sizeof(*type), 1);
 
-	for (i = 0; i < D->impls->count; ++i) {
-		zend_function_entry *zf = &zfe[j];
-		PSI_LibffiData *data;
+	*type = *(ffi_type *) orig_type;
+	return type;
+}
 
-		if (!D->impls->list[i]->decl) {
-			continue;
-		}
+static void psi_ffi_layoutof_type(struct psi_context *C, void *orig_type,
+		struct psi_layout *l)
+{
+	ffi_type *type = orig_type;
 
-		data = PSI_LibffiDataAlloc(ctx, D->impls->list[i]);
-		zf->fname = D->impls->list[i]->func->name + (D->impls->list[i]->func->name[0] == '\\');
-		zf->num_args = D->impls->list[i]->func->args->count;
-		zf->handler = data->code;
-		zf->arg_info = data->arginfo;
-		++j;
+	if (!type->size || !type->alignment) {
+		ffi_cif tmp;
+		ffi_prep_cif(&tmp, FFI_DEFAULT_ABI, 0, type, NULL);
 	}
 
-	return zfe;
+	l->pos = type->alignment;
+	l->len = type->size;
 }
 
-static PSI_ContextOps ops = {
-	init,
-	dtor,
-	compile,
+static struct psi_context_ops ops = {
+	"libffi",
+	psi_ffi_load,
+	psi_ffi_free,
+	psi_ffi_init,
+	psi_ffi_dtor,
+	psi_ffi_composite_init,
+	psi_ffi_composite_dtor,
+	psi_ffi_extvar_init,
+	psi_ffi_extvar_dtor,
+	psi_ffi_decl_init,
+	psi_ffi_decl_dtor,
+	psi_ffi_impl_init,
+	psi_ffi_impl_dtor,
+	psi_ffi_cb_init,
+	psi_ffi_cb_dtor,
+	psi_ffi_call,
+	psi_ffi_call_va,
+	psi_ffi_typeof_impl,
+	psi_ffi_typeof_decl,
+	psi_ffi_copyof_type,
+	psi_ffi_layoutof_type,
 };
 
-PSI_ContextOps *PSI_Libffi(void)
+struct psi_context_ops *psi_libffi_ops(void)
 {
 	return &ops;
 }
+
+#endif /* HAVE_LIBFFI */