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#
#
# Nimrod's Runtime Library
# (c) Copyright 2009 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
# This file implements the ability to call native procs from libraries.
# It is not possible to do this in a platform independant way, unfortunately.
# However, the interface has been designed to take platform differences into
# account and been ported to all major platforms.
type
TLibHandle = pointer # private type
TProcAddr = pointer # libary loading and loading of procs:
const
NilLibHandle: TLibHandle = nil
proc nimLoadLibrary(path: string): TLibHandle {.compilerproc.}
proc nimUnloadLibrary(lib: TLibHandle) {.compilerproc.}
proc nimGetProcAddr(lib: TLibHandle, name: cstring): TProcAddr {.compilerproc.}
proc nimLoadLibraryError(path: string) {.compilerproc, noinline.} =
raise newException(EInvalidLibrary, "could not load: " & path)
# this code was inspired from Lua's source code:
# Lua - An Extensible Extension Language
# Tecgraf: Computer Graphics Technology Group, PUC-Rio, Brazil
# http://www.lua.org
# mailto:info@lua.org
when defined(posix):
#
# =========================================================================
# This is an implementation based on the dlfcn interface.
# The dlfcn interface is available in Linux, SunOS, Solaris, IRIX, FreeBSD,
# NetBSD, AIX 4.2, HPUX 11, and probably most other Unix flavors, at least
# as an emulation layer on top of native functions.
# =========================================================================
#
# c stuff:
var
RTLD_NOW {.importc: "RTLD_NOW", header: "<dlfcn.h>".}: int
proc dlclose(lib: TLibHandle) {.importc, header: "<dlfcn.h>".}
proc dlopen(path: CString, mode: int): TLibHandle {.
importc, header: "<dlfcn.h>".}
proc dlsym(lib: TLibHandle, name: cstring): TProcAddr {.
importc, header: "<dlfcn.h>".}
proc nimUnloadLibrary(lib: TLibHandle) =
dlclose(lib)
proc nimLoadLibrary(path: string): TLibHandle =
result = dlopen(path, RTLD_NOW)
proc nimGetProcAddr(lib: TLibHandle, name: cstring): TProcAddr =
result = dlsym(lib, name)
if result == nil: nimLoadLibraryError($name)
elif defined(windows) or defined(dos):
#
# =======================================================================
# Native Windows Implementation
# =======================================================================
#
type
THINSTANCE {.importc: "HINSTANCE".} = pointer
proc FreeLibrary(lib: THINSTANCE) {.importc, header: "<windows.h>", stdcall.}
proc winLoadLibrary(path: cstring): THINSTANCE {.
importc: "LoadLibraryA", header: "<windows.h>", stdcall.}
proc GetProcAddress(lib: THINSTANCE, name: cstring): TProcAddr {.
importc: "GetProcAddress", header: "<windows.h>", stdcall.}
proc nimUnloadLibrary(lib: TLibHandle) =
FreeLibrary(cast[THINSTANCE](lib))
proc nimLoadLibrary(path: string): TLibHandle =
result = cast[TLibHandle](winLoadLibrary(path))
proc nimGetProcAddr(lib: TLibHandle, name: cstring): TProcAddr =
result = GetProcAddress(cast[THINSTANCE](lib), name)
if result == nil: nimLoadLibraryError($name)
elif defined(mac):
#
# =======================================================================
# Native Mac OS X / Darwin Implementation
# =======================================================================
#
{.error: "no implementation for dyncalls yet".}
proc nimUnloadLibrary(lib: TLibHandle) =
NSUnLinkModule(NSModule(lib), NSUNLINKMODULE_OPTION_RESET_LAZY_REFERENCES)
var
dyld_present {.importc: "_dyld_present", header: "<dyld.h>".}: int
proc nimLoadLibrary(path: string): TLibHandle =
var
img: NSObjectFileImage
ret: NSObjectFileImageReturnCode
modul: NSModule
# this would be a rare case, but prevents crashing if it happens
result = nil
if dyld_present != 0:
ret = NSCreateObjectFileImageFromFile(path, addr(img))
if ret == NSObjectFileImageSuccess:
modul = NSLinkModule(img, path, NSLINKMODULE_OPTION_PRIVATE or
NSLINKMODULE_OPTION_RETURN_ON_ERROR)
NSDestroyObjectFileImage(img)
result = TLibHandle(modul)
proc nimGetProcAddr(lib: TLibHandle, name: cstring): TProcAddr =
var
nss: NSSymbol
nss = NSLookupSymbolInModule(NSModule(lib), name)
result = TProcAddr(NSAddressOfSymbol(nss))
if result == nil: nimLoadLibraryError($name)
else:
{.error: "no implementation for dyncalls".}
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