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+/* -----------------------------------------------------------------------
+ raw_api.c - Copyright (c) 1999, 2008 Red Hat, Inc.
+
+ Author: Kresten Krab Thorup <krab@gnu.org>
+
+ Permission is hereby granted, free of charge, to any person obtaining
+ a copy of this software and associated documentation files (the
+ ``Software''), to deal in the Software without restriction, including
+ without limitation the rights to use, copy, modify, merge, publish,
+ distribute, sublicense, and/or sell copies of the Software, and to
+ permit persons to whom the Software is furnished to do so, subject to
+ the following conditions:
+
+ The above copyright notice and this permission notice shall be included
+ in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ DEALINGS IN THE SOFTWARE.
+ ----------------------------------------------------------------------- */
+
+/* This file defines generic functions for use with the raw api. */
+
+#include <ffi.h>
+#include <ffi_common.h>
+
+#if !FFI_NO_RAW_API
+
+size_t
+ffi_raw_size (ffi_cif *cif)
+{
+ size_t result = 0;
+ int i;
+
+ ffi_type **at = cif->arg_types;
+
+ for (i = cif->nargs-1; i >= 0; i--, at++)
+ {
+#if !FFI_NO_STRUCTS
+ if ((*at)->type == FFI_TYPE_STRUCT)
+ result += ALIGN (sizeof (void*), FFI_SIZEOF_ARG);
+ else
+#endif
+ result += ALIGN ((*at)->size, FFI_SIZEOF_ARG);
+ }
+
+ return result;
+}
+
+
+void
+ffi_raw_to_ptrarray (ffi_cif *cif, ffi_raw *raw, void **args)
+{
+ unsigned i;
+ ffi_type **tp = cif->arg_types;
+
+#if WORDS_BIGENDIAN
+
+ for (i = 0; i < cif->nargs; i++, tp++, args++)
+ {
+ switch ((*tp)->type)
+ {
+ case FFI_TYPE_UINT8:
+ case FFI_TYPE_SINT8:
+ *args = (void*) ((char*)(raw++) + FFI_SIZEOF_ARG - 1);
+ break;
+
+ case FFI_TYPE_UINT16:
+ case FFI_TYPE_SINT16:
+ *args = (void*) ((char*)(raw++) + FFI_SIZEOF_ARG - 2);
+ break;
+
+#if FFI_SIZEOF_ARG >= 4
+ case FFI_TYPE_UINT32:
+ case FFI_TYPE_SINT32:
+ *args = (void*) ((char*)(raw++) + FFI_SIZEOF_ARG - 4);
+ break;
+#endif
+
+#if !FFI_NO_STRUCTS
+ case FFI_TYPE_STRUCT:
+ *args = (raw++)->ptr;
+ break;
+#endif
+
+ case FFI_TYPE_POINTER:
+ *args = (void*) &(raw++)->ptr;
+ break;
+
+ default:
+ *args = raw;
+ raw += ALIGN ((*tp)->size, FFI_SIZEOF_ARG) / FFI_SIZEOF_ARG;
+ }
+ }
+
+#else /* WORDS_BIGENDIAN */
+
+#if !PDP
+
+ /* then assume little endian */
+ for (i = 0; i < cif->nargs; i++, tp++, args++)
+ {
+#if !FFI_NO_STRUCTS
+ if ((*tp)->type == FFI_TYPE_STRUCT)
+ {
+ *args = (raw++)->ptr;
+ }
+ else
+#endif
+ {
+ *args = (void*) raw;
+ raw += ALIGN ((*tp)->size, sizeof (void*)) / sizeof (void*);
+ }
+ }
+
+#else
+#error "pdp endian not supported"
+#endif /* ! PDP */
+
+#endif /* WORDS_BIGENDIAN */
+}
+
+void
+ffi_ptrarray_to_raw (ffi_cif *cif, void **args, ffi_raw *raw)
+{
+ unsigned i;
+ ffi_type **tp = cif->arg_types;
+
+ for (i = 0; i < cif->nargs; i++, tp++, args++)
+ {
+ switch ((*tp)->type)
+ {
+ case FFI_TYPE_UINT8:
+ (raw++)->uint = *(UINT8*) (*args);
+ break;
+
+ case FFI_TYPE_SINT8:
+ (raw++)->sint = *(SINT8*) (*args);
+ break;
+
+ case FFI_TYPE_UINT16:
+ (raw++)->uint = *(UINT16*) (*args);
+ break;
+
+ case FFI_TYPE_SINT16:
+ (raw++)->sint = *(SINT16*) (*args);
+ break;
+
+#if FFI_SIZEOF_ARG >= 4
+ case FFI_TYPE_UINT32:
+ (raw++)->uint = *(UINT32*) (*args);
+ break;
+
+ case FFI_TYPE_SINT32:
+ (raw++)->sint = *(SINT32*) (*args);
+ break;
+#endif
+
+#if !FFI_NO_STRUCTS
+ case FFI_TYPE_STRUCT:
+ (raw++)->ptr = *args;
+ break;
+#endif
+
+ case FFI_TYPE_POINTER:
+ (raw++)->ptr = **(void***) args;
+ break;
+
+ default:
+ memcpy ((void*) raw->data, (void*)*args, (*tp)->size);
+ raw += ALIGN ((*tp)->size, FFI_SIZEOF_ARG) / FFI_SIZEOF_ARG;
+ }
+ }
+}
+
+#if !FFI_NATIVE_RAW_API
+
+
+/* This is a generic definition of ffi_raw_call, to be used if the
+ * native system does not provide a machine-specific implementation.
+ * Having this, allows code to be written for the raw API, without
+ * the need for system-specific code to handle input in that format;
+ * these following couple of functions will handle the translation forth
+ * and back automatically. */
+
+void ffi_raw_call (ffi_cif *cif, void (*fn)(void), void *rvalue, ffi_raw *raw)
+{
+ void **avalue = (void**) alloca (cif->nargs * sizeof (void*));
+ ffi_raw_to_ptrarray (cif, raw, avalue);
+ ffi_call (cif, fn, rvalue, avalue);
+}
+
+#if FFI_CLOSURES /* base system provides closures */
+
+static void
+ffi_translate_args (ffi_cif *cif, void *rvalue,
+ void **avalue, void *user_data)
+{
+ ffi_raw *raw = (ffi_raw*)alloca (ffi_raw_size (cif));
+ ffi_raw_closure *cl = (ffi_raw_closure*)user_data;
+
+ ffi_ptrarray_to_raw (cif, avalue, raw);
+ (*cl->fun) (cif, rvalue, raw, cl->user_data);
+}
+
+ffi_status
+ffi_prep_raw_closure_loc (ffi_raw_closure* cl,
+ ffi_cif *cif,
+ void (*fun)(ffi_cif*,void*,ffi_raw*,void*),
+ void *user_data,
+ void *codeloc)
+{
+ ffi_status status;
+
+ status = ffi_prep_closure_loc ((ffi_closure*) cl,
+ cif,
+ &ffi_translate_args,
+ codeloc,
+ codeloc);
+ if (status == FFI_OK)
+ {
+ cl->fun = fun;
+ cl->user_data = user_data;
+ }
+
+ return status;
+}
+
+#endif /* FFI_CLOSURES */
+#endif /* !FFI_NATIVE_RAW_API */
+
+#if FFI_CLOSURES
+
+/* Again, here is the generic version of ffi_prep_raw_closure, which
+ * will install an intermediate "hub" for translation of arguments from
+ * the pointer-array format, to the raw format */
+
+ffi_status
+ffi_prep_raw_closure (ffi_raw_closure* cl,
+ ffi_cif *cif,
+ void (*fun)(ffi_cif*,void*,ffi_raw*,void*),
+ void *user_data)
+{
+ return ffi_prep_raw_closure_loc (cl, cif, fun, user_data, cl);
+}
+
+#endif /* FFI_CLOSURES */
+
+#endif /* !FFI_NO_RAW_API */
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