first steps for FFI support at compile time

1 files changed, 149 insertions, 0 deletions

diff --git a/lib/wrappers/libffi.nim b/lib/wrappers/libffi.nim
new file mode 100644
index 000000000..514ce024f
--- /dev/null
+++ b/lib/wrappers/libffi.nim
@@ -0,0 +1,149 @@
+# -----------------------------------------------------------------*-C-*-
+#   libffi 3.0.10 - Copyright (c) 2011 Anthony Green
+#                    - Copyright (c) 1996-2003, 2007, 2008 Red Hat, Inc.
+#
+#   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.
+#
+#   ----------------------------------------------------------------------- 
+
+{.deadCodeElim: on.}
+
+when defined(windows): 
+  const libffidll* = "libffi.dll"
+elif defined(macosx): 
+  const libffidll* = "libffi.dylib"
+else: 
+  const libffidll* = "libffi.so"
+
+type
+  TArg* = int
+  TSArg* = int
+
+when defined(windows) and defined(x86):
+  type
+    TABI* {.size: sizeof(cint).} = enum
+      FIRST_ABI, SYSV, STDCALL
+
+  const DEFAULT_ABI* = SYSV
+elif defined(amd64) and defined(windows):
+  type 
+    TABI* {.size: sizeof(cint).} = enum 
+      FIRST_ABI, WIN64
+  const DEFAULT_ABI* = WIN64
+else:
+  type 
+    TABI* {.size: sizeof(cint).} = enum
+      FIRST_ABI, SYSV, UNIX64
+
+  when defined(i386):
+    const DEFAULT_ABI* = SYSV
+  else: 
+    const DEFAULT_ABI* = UNIX64
+    
+const 
+  tkVOID* = 0
+  tkINT* = 1
+  tkFLOAT* = 2
+  tkDOUBLE* = 3
+  tkLONGDOUBLE* = 4
+  tkUINT8* = 5
+  tkSINT8* = 6
+  tkUINT16* = 7
+  tkSINT16* = 8
+  tkUINT32* = 9
+  tkSINT32* = 10
+  tkUINT64* = 11
+  tkSINT64* = 12
+  tkSTRUCT* = 13
+  tkPOINTER* = 14
+
+  tkLAST = tkPOINTER
+  tkSMALL_STRUCT_1B* = (tkLAST + 1)
+  tkSMALL_STRUCT_2B* = (tkLAST + 2)
+  tkSMALL_STRUCT_4B* = (tkLAST + 3)
+
+type
+  TType* = object
+    size*: int
+    alignment*: uint16
+    typ*: uint16
+    elements*: ptr ptr TType
+
+var
+  type_void* {.importc: "ffi_type_void", dynlib: libffidll.}: TType
+  type_uint8* {.importc: "ffi_type_uint8", dynlib: libffidll.}: TType
+  type_sint8* {.importc: "ffi_type_sint8", dynlib: libffidll.}: TType
+  type_uint16* {.importc: "ffi_type_uint16", dynlib: libffidll.}: TType
+  type_sint16* {.importc: "ffi_type_sint16", dynlib: libffidll.}: TType
+  type_uint32* {.importc: "ffi_type_uint32", dynlib: libffidll.}: TType
+  type_sint32* {.importc: "ffi_type_sint32", dynlib: libffidll.}: TType
+  type_uint64* {.importc: "ffi_type_uint64", dynlib: libffidll.}: TType
+  type_sint64* {.importc: "ffi_type_sint64", dynlib: libffidll.}: TType
+  type_float* {.importc: "ffi_type_float", dynlib: libffidll.}: TType
+  type_double* {.importc: "ffi_type_double", dynlib: libffidll.}: TType
+  type_pointer* {.importc: "ffi_type_pointer", dynlib: libffidll.}: TType
+  type_longdouble* {.importc: "ffi_type_longdouble", dynlib: libffidll.}: TType
+
+type 
+  Tstatus* {.size: sizeof(cint).} = enum 
+    OK, BAD_TYPEDEF, BAD_ABI
+  TTypeKind* = cuint
+  TCif* {.pure, final.} = object 
+    abi*: TABI
+    nargs*: cuint
+    arg_types*: ptr ptr TType
+    rtype*: ptr TType
+    bytes*: cuint
+    flags*: cuint
+
+type
+  TRaw* = object 
+    sint*: TSArg
+
+proc raw_call*(cif: var Tcif; fn: proc () {.cdecl.}; rvalue: pointer; 
+               avalue: ptr TRaw) {.cdecl, importc: "ffi_raw_call", 
+                                   dynlib: libffidll.}
+proc ptrarray_to_raw*(cif: var Tcif; args: ptr pointer; raw: ptr TRaw) {.cdecl, 
+    importc: "ffi_ptrarray_to_raw", dynlib: libffidll.}
+proc raw_to_ptrarray*(cif: var Tcif; raw: ptr TRaw; args: ptr pointer) {.cdecl, 
+    importc: "ffi_raw_to_ptrarray", dynlib: libffidll.}
+proc raw_size*(cif: var Tcif): int {.cdecl, importc: "ffi_raw_size", 
+                                     dynlib: libffidll.}
+
+proc prep_cif*(cif: var Tcif; abi: TABI; nargs: cuint; rtype: ptr TType; 
+               atypes: ptr ptr TType): TStatus {.cdecl, importc: "ffi_prep_cif", 
+    dynlib: libffidll.}
+proc call*(cif: var Tcif; fn: proc () {.cdecl.}; rvalue: pointer; 
+           avalue: ptr pointer) {.cdecl, importc: "ffi_call", dynlib: libffidll.}
+
+# the same with an easier interface:
+type
+  TParamList* = array[0..100, ptr TType]
+  TArgList* = array[0..100, pointer]
+
+proc prep_cif*(cif: var Tcif; abi: TABI; nargs: cuint; rtype: ptr TType; 
+               atypes: TParamList): TStatus {.cdecl, importc: "ffi_prep_cif",
+    dynlib: libffidll.}
+proc call*(cif: var Tcif; fn, rvalue: pointer;
+           avalue: TArgList) {.cdecl, importc: "ffi_call", dynlib: libffidll.}
+
+# Useful for eliminating compiler warnings 
+##define FFI_FN(f) ((void (*)(void))f)