X-Git-Url: https://git.m6w6.name/?p=m6w6%2Fext-psi;a=blobdiff_plain;f=src%2Flibffi.c;h=221e2c24507689b02549a5fd65f6a3551c853685;hp=d5158271b65879a31afccd66dbbbef6f922f5730;hb=8b652242a4ef920f2ab82bfb822596de25bc5a63;hpb=61918592ab618c073b9846783ce79fed9f26c5f7

diff --git a/src/libffi.c b/src/libffi.c
index d515827..221e2c2 100644
--- a/src/libffi.c
+++ b/src/libffi.c
@@ -8,6 +8,7 @@
 
 #include "php_psi.h"
 #include "libffi.h"
+#include "engine.h"
 
 #undef PACKAGE
 #undef PACKAGE_BUGREPORT
@@ -42,10 +43,25 @@ static void *psi_ffi_closure_alloc(size_t s, void **code)
 	}
 	return *code;
 #else
-	return NULL;
+# error "Neither ffi_closure_alloc() nor mmap() available"
 #endif
 }
 
+static ffi_status psi_ffi_prep_closure(ffi_closure **closure, void **code, ffi_cif *sig, void (*handler)(ffi_cif*,void*,void**,void*), void *data) {
+	*closure = psi_ffi_closure_alloc(sizeof(ffi_closure), code);
+	ZEND_ASSERT(*closure != NULL);
+
+#if PSI_HAVE_FFI_PREP_CLOSURE_LOC
+	return ffi_prep_closure_loc(*closure, sig, handler, data, *code);
+
+#elif PSI_HAVE_FFI_PREP_CLOSURE
+	return ffi_prep_closure(*code, sig, handler, data);
+#else
+# error "Neither ffi_prep_closure() nor ffi_prep_closure_loc() is available"
+#endif
+
+}
+
 static void psi_ffi_closure_free(void *c)
 {
 #ifdef PSI_HAVE_FFI_CLOSURE_ALLOC
@@ -55,11 +71,113 @@ static void psi_ffi_closure_free(void *c)
 #endif
 }
 
-static void psi_ffi_handler(ffi_cif *signature, void *_result, void **_args, void *_data);
+static void psi_ffi_handler(ffi_cif *_sig, void *_result, void **_args, void *_data)
+{
+	psi_call(*(zend_execute_data **)_args[0], *(zval **)_args[1], _data);
+}
+
+static void psi_ffi_callback(ffi_cif *_sig, void *_result, void **_args, void *_data)
+{
+	unsigned argc = _sig->nargs;
+	void **argv = _args;
+	ffi_arg *res = _result;
+	let_stmt *let;
+	decl_arg *darg = let->var->arg;
+	decl *decl_cb = darg->type->func;
+	let_callback *cb = let->val->data.callback;
+	impl_arg *iarg = cb->func->arg;
+	size_t i, argc = cb->args->count;
+	zval return_value, *argv = calloc(argc, sizeof(*argv));
+
+	// prepare args for the userland call
+	for (i = 0; i < decl_cb->args->count; ++i) {
+
+	}
+	for (i = 0; i < cb->args->count; ++i) {
+		psi_do_set(&argv[i], cb->args->vals[i]);
+	}
+	zend_fcall_info_argp(iarg->val.zend.cb->fci, argc, argv);
+	zend_fcall_info_call(&iarg->val.zend.cb->fci, &iarg->val.zend.cb->fcc,
+			&return_value, NULL);
+	// marshal return value of the userland call
+	switch (cb->func->type) {
+	case PSI_T_BOOLVAL:
+		break;
+	case PSI_T_INTVAL:
+		break;
+	case PSI_T_FLOATVAL:
+		break;
+	case PSI_T_PATHVAL:
+	case PSI_T_STRVAL:
+		break;
+	case PSI_T_STRLEN:
+		break;
+	case PSI_T_ARRVAL:
+		break;
+	case PSI_T_OBJVAL:
+		break;
+	case PSI_T_CALLBACK:
+		break;
+	EMPTY_SWITCH_DEFAULT_CASE();
+	}
+	darg->ptr = psi_let_val(cb->func->type, iarg, darg->ptr, real_decl_type(darg->type)->strct, &darg->mem);
+}
+
+static inline ffi_type *psi_ffi_decl_arg_type(decl_arg *darg);
+
+typedef struct PSI_LibffiContext {
+	ffi_cif signature;
+	ffi_type *params[2];
+} PSI_LibffiContext;
+
+typedef struct PSI_LibffiCall {
+	void *code;
+	ffi_closure *closure;
+	ffi_cif signature;
+	void *params[1]; /* [type1, type2, NULL, arg1, arg2] ... */
+} PSI_LibffiCall;
 
 static inline ffi_abi psi_ffi_abi(const char *convention) {
 	return FFI_DEFAULT_ABI;
 }
+
+static inline PSI_LibffiCall *PSI_LibffiCallAlloc(PSI_Context *C, decl *decl) {
+	int rc;
+	size_t i, c = decl->args ? decl->args->count : 0;
+	PSI_LibffiCall *call = calloc(1, sizeof(*call) + 2 * c * sizeof(void *));
+
+	for (i = 0; i < c; ++i) {
+		call->params[i] = psi_ffi_decl_arg_type(decl->args->args[i]);
+	}
+	call->params[c] = NULL;
+
+	decl->call.info = call;
+	decl->call.rval = &decl->func->ptr;
+	decl->call.argc = c;
+	decl->call.args = (void **) &call->params[c+1];
+
+	rc = ffi_prep_cif(&call->signature, psi_ffi_abi(decl->abi->convention),
+			c, psi_ffi_decl_arg_type(decl->func), (ffi_type **) call->params);
+	ZEND_ASSERT(FFI_OK == rc);
+
+	return call;
+}
+
+static inline void PSI_LibffiCallInitClosure(PSI_Context *C, PSI_LibffiCall *call, impl *impl) {
+	PSI_LibffiContext *context = C->context;
+	ffi_status rc;
+
+	rc = psi_ffi_prep_closure(&call->closure, &call->code, &context->signature, psi_ffi_handler, impl);
+	ZEND_ASSERT(FFI_OK == rc);
+}
+
+static inline void PSI_LibffiCallFree(PSI_LibffiCall *call) {
+	if (call->closure) {
+		psi_ffi_closure_free(call->closure);
+	}
+	free(call);
+}
+
 static inline ffi_type *psi_ffi_token_type(token_t t) {
 	switch (t) {
 	default:
@@ -86,85 +204,156 @@ static inline ffi_type *psi_ffi_token_type(token_t t) {
 	case PSI_T_BOOL:
 		return &ffi_type_uchar;
 	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_token_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;
 }
+static void psi_ffi_struct_type_dtor(void *type) {
+	ffi_type *strct = type;
 
-typedef struct PSI_LibffiContext {
-	ffi_cif signature;
-	ffi_type *params[2];
-} PSI_LibffiContext;
+	if (strct->elements) {
+		ffi_type **ptr;
 
-typedef struct PSI_LibffiCall {
-	void *code;
-	ffi_closure *closure;
-	ffi_cif signature;
-	void *params[1]; /* [type1, type2, NULL, arg1, arg2] ... */
-} PSI_LibffiCall;
+		for (ptr = strct->elements; *ptr; ++ptr) {
+			free(*ptr);
+		}
+		free(strct->elements);
+	}
+	free(strct);
+}
 
-static inline PSI_LibffiCall *PSI_LibffiCallAlloc(PSI_Context *C, decl *decl) {
-	int rc;
-	size_t i, c = decl->args ? decl->args->count : 0;
-	PSI_LibffiCall *call = calloc(1, sizeof(*call) + 2 * c * sizeof(void *));
+static size_t psi_ffi_struct_type_pad(ffi_type **els, size_t padding) {
+	size_t i;
 
-	for (i = 0; i < c; ++i) {
-		call->params[i] = psi_ffi_decl_arg_type(decl->args->args[i]);
+	for (i = 0; i < padding; ++i) {
+		ffi_type *pad = malloc(sizeof(*pad));
+
+		memcpy(pad, &ffi_type_schar, sizeof(*pad));
+		*els++ = pad;
 	}
-	call->params[c] = NULL;
 
-	decl->call.info = call;
-	decl->call.args = (void **) &call->params[c+1];
+	return padding;
+}
 
-	rc = ffi_prep_cif(&call->signature, psi_ffi_abi(decl->abi->convention),
-			c, psi_ffi_decl_arg_type(decl->func), (ffi_type **) call->params);
-	ZEND_ASSERT(FFI_OK == rc);
+static ffi_type **psi_ffi_struct_type_elements(decl_struct *strct) {
+	size_t i, argc = strct->args->count, nels = 0, offset = 0, maxalign = 0;
+	ffi_type **els = calloc(argc + 1, sizeof(*els));
 
-	return call;
-}
+	for (i = 0; i < strct->args->count; ++i) {
+		decl_arg *darg = strct->args->args[i];
+		ffi_type *type = malloc(sizeof(*type));
+		size_t padding;
 
-static inline void PSI_LibffiCallInitClosure(PSI_Context *C, PSI_LibffiCall *call, impl *impl) {
-	PSI_LibffiContext *context = C->context;
-	int rc;
+		memcpy(type, psi_ffi_decl_arg_type(darg), sizeof(*type));
 
-	call->closure = psi_ffi_closure_alloc(sizeof(ffi_closure), &call->code);
-	ZEND_ASSERT(call->closure != NULL);
+		ZEND_ASSERT(type->size == darg->layout->len);
 
-#if PSI_HAVE_FFI_PREP_CLOSURE_LOC
-	rc = ffi_prep_closure_loc(
-			call->closure,
-			&context->signature,
-			psi_ffi_handler,
-			impl,
-			call->code);
+		if (type->alignment > maxalign) {
+			maxalign = type->alignment;
+		}
 
-#elif PSI_HAVE_FFI_PREP_CLOSURE
-	rc = ffi_prep_closure(data->code, &context->signature, psi_ffi_handler, data);
-#else
-# error "Neither ffi_prep_closure() nor ffi_prep_closure_loc() available"
-#endif
-	ZEND_ASSERT(FFI_OK == rc);
+		if ((padding = psi_offset_padding(darg->layout->pos - offset, type->alignment))) {
+			if (nels + padding + 1 > argc) {
+				argc += padding;
+				els = realloc(els, (argc + 1) * sizeof(*els));
+				els[argc] = NULL;
+			}
+			psi_ffi_struct_type_pad(&els[nels], padding);
+			nels += padding;
+			offset += padding;
+		}
+		ZEND_ASSERT(offset == darg->layout->pos);
+
+		offset = (offset + darg->layout->len + type->alignment - 1) & ~(type->alignment - 1);
+		els[nels++] = type;
+	}
+
+	/* apply struct alignment padding */
+	offset = (offset + maxalign - 1) & ~(maxalign - 1);
+
+	ZEND_ASSERT(offset <= strct->size);
+	if (offset < strct->size) {
+		psi_ffi_struct_type_pad(&els[nels], strct->size - offset);
+	}
+
+	return els;
 }
+static inline ffi_type *psi_ffi_decl_type(decl_type *type) {
+	decl_type *real = real_decl_type(type);
+
+	switch (real->type) {
+	case PSI_T_FUNCTION:
+		if (!real->func->call.sym) {
+			PSI_LibffiCall *call = PSI_LibffiCallAlloc(&PSI_G(context), real->func);
+			ffi_status rc;
+
+			rc = psi_ffi_prep_closure(
+					(void *) &real->func->call.closure.data,
+					&real->func->call.sym, &call->signature, psi_ffi_handler, NULL);
+			if (FFI_OK == rc) {
+				real->func->call.info = call;
+				real->func->call.closure.dtor = psi_ffi_closure_free;
+			}
+		}
+		return &ffi_type_pointer;
 
-static inline void PSI_LibffiCallFree(PSI_LibffiCall *call) {
-	if (call->closure) {
-		psi_ffi_closure_free(call->closure);
+	case PSI_T_STRUCT:
+		if (!real->strct->engine.type) {
+			ffi_type *strct = calloc(1, sizeof(ffi_type));
+
+			strct->type = FFI_TYPE_STRUCT;
+			strct->size = 0;
+			strct->elements = psi_ffi_struct_type_elements(real->strct);
+
+			real->strct->engine.type = strct;
+			real->strct->engine.dtor = psi_ffi_struct_type_dtor;
+		}
+
+		return real->strct->engine.type;
+
+	case PSI_T_UNION:
+		return psi_ffi_decl_arg_type(real->unn->args->args[0]);
+
+	default:
+		return psi_ffi_token_type(real->type);
 	}
-	free(call);
 }
+static inline ffi_type *psi_ffi_decl_arg_type(decl_arg *darg) {
+	if (darg->var->pointer_level) {
+		return &ffi_type_pointer;
+	} else {
+		return psi_ffi_decl_type(darg->type);
+	}
+}
+
 
 static inline PSI_LibffiContext *PSI_LibffiContextInit(PSI_LibffiContext *L) {
 	ffi_status rc;
@@ -182,11 +371,6 @@ static inline PSI_LibffiContext *PSI_LibffiContextInit(PSI_LibffiContext *L) {
 	return L;
 }
 
-static void psi_ffi_handler(ffi_cif *_sig, void *_result, void **_args, void *_data)
-{
-	psi_call(*(zend_execute_data **)_args[0], *(zval **)_args[1], _data);
-}
-
 static void psi_ffi_init(PSI_Context *C)
 {
 	C->context = PSI_LibffiContextInit(NULL);
@@ -250,10 +434,38 @@ static zend_function_entry *psi_ffi_compile(PSI_Context *C)
 	return zfe;
 }
 
-static void psi_ffi_call(PSI_Context *C, impl_val *ret_val, decl *decl) {
-	PSI_LibffiCall *call = decl->call.info;
+static void psi_ffi_call(PSI_Context *C, decl_callinfo *decl_call, impl_vararg *va) {
+	PSI_LibffiCall *call = decl_call->info;
 
-	ffi_call(&call->signature, FFI_FN(decl->call.sym), ret_val, decl->call.args);
+	if (va) {
+		ffi_status rc;
+		ffi_cif signature;
+		size_t i, nfixedargs = decl_call->argc, ntotalargs = nfixedargs + va->args->count;
+		void **params = calloc(2 * ntotalargs + 2, sizeof(void *));
+
+		for (i = 0; i < nfixedargs; ++i) {
+			params[i] = call->params[i];
+			params[i + ntotalargs + 1] = call->params[i + nfixedargs + 1];
+		}
+		for (i = 0; i < va->args->count; ++i) {
+			params[nfixedargs + i] = psi_ffi_impl_type(va->types[i]);
+			params[nfixedargs + i + ntotalargs + 1] = &va->values[i];
+		}
+#ifdef PSI_HAVE_FFI_PREP_CIF_VAR
+		rc = ffi_prep_cif_var(&signature, call->signature.abi,
+				nfixedargs, ntotalargs,
+				call->signature.rtype, (ffi_type **) params);
+#else
+		/* FIXME: test in config.m4; assume we can just call anyway */
+		rc = ffi_prep_cif(&signature, call->signature.abi, ntotalargs,
+				call->signature.rtype, (ffi_type **) params);
+#endif
+		ZEND_ASSERT(FFI_OK == rc);
+		ffi_call(&signature, FFI_FN(decl_call->sym), *decl_call->rval, &params[ntotalargs + 1]);
+		free(params);
+	} else {
+		ffi_call(&call->signature, FFI_FN(decl_call->sym), *decl_call->rval, decl_call->args);
+	}
 }
 
 static PSI_ContextOps ops = {