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#
#
# Nim's Runtime Library
# (c) Copyright 2012 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 independent way, unfortunately.
# However, the interface has been designed to take platform differences into
# account and been ported to all major platforms.
{.push stack_trace: off.}
const
NilLibHandle: LibHandle = nil
proc rawWrite(f: File, s: string) =
# we cannot throw an exception here!
discard writeBuffer(f, cstring(s), s.len)
proc nimLoadLibraryError(path: string) =
# carefully written to avoid memory allocation:
stderr.rawWrite("could not load: ")
stderr.rawWrite(path)
stderr.rawWrite("\n")
when not(defined(nimDebugDlOpen)):
stderr.rawWrite("compile with -d:nimDebugDlOpen for more information\n")
quit(1)
proc procAddrError(name: cstring) {.noinline.} =
# carefully written to avoid memory allocation:
stderr.rawWrite("could not import: ")
stderr.write(name)
stderr.rawWrite("\n")
quit(1)
# 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:
when defined(linux) or defined(macosx):
const RTLD_NOW = cint(2)
else:
var
RTLD_NOW {.importc: "RTLD_NOW", header: "<dlfcn.h>".}: cint
proc dlclose(lib: LibHandle) {.importc, header: "<dlfcn.h>".}
proc dlopen(path: cstring, mode: cint): LibHandle {.
importc, header: "<dlfcn.h>".}
proc dlsym(lib: LibHandle, name: cstring): ProcAddr {.
importc, header: "<dlfcn.h>".}
proc dlerror(): cstring {.importc, header: "<dlfcn.h>".}
proc nimUnloadLibrary(lib: LibHandle) =
dlclose(lib)
proc nimLoadLibrary(path: string): LibHandle =
result = dlopen(path, RTLD_NOW)
when defined(nimDebugDlOpen):
let error = dlerror()
if error != nil:
stderr.write(error)
stderr.rawWrite("\n")
proc nimGetProcAddr(lib: LibHandle, name: cstring): ProcAddr =
result = dlsym(lib, name)
if result == nil: procAddrError(name)
elif defined(windows) or defined(dos):
#
# =======================================================================
# Native Windows Implementation
# =======================================================================
#
when defined(cpp):
type
THINSTANCE {.importc: "HINSTANCE".} = object
x: pointer
proc getProcAddress(lib: THINSTANCE, name: cstring): ProcAddr {.
importcpp: "(void*)GetProcAddress(@)", header: "<windows.h>", stdcall.}
else:
type
THINSTANCE {.importc: "HINSTANCE".} = pointer
proc getProcAddress(lib: THINSTANCE, name: cstring): ProcAddr {.
importc: "GetProcAddress", header: "<windows.h>", stdcall.}
proc freeLibrary(lib: THINSTANCE) {.
importc: "FreeLibrary", header: "<windows.h>", stdcall.}
proc winLoadLibrary(path: cstring): THINSTANCE {.
importc: "LoadLibraryA", header: "<windows.h>", stdcall.}
proc nimUnloadLibrary(lib: LibHandle) =
freeLibrary(cast[THINSTANCE](lib))
proc nimLoadLibrary(path: string): LibHandle =
result = cast[LibHandle](winLoadLibrary(path))
proc nimGetProcAddr(lib: LibHandle, name: cstring): ProcAddr =
result = getProcAddress(cast[THINSTANCE](lib), name)
if result != nil: return
const decorated_length = 250
var decorated: array[decorated_length, char]
decorated[0] = '_'
var m = 1
while m < (decorated_length - 5):
if name[m - 1] == '\x00': break
decorated[m] = name[m - 1]
inc(m)
decorated[m] = '@'
for i in countup(0, 50):
var k = i * 4
if k div 100 == 0:
if k div 10 == 0:
m = m + 1
else:
m = m + 2
else:
m = m + 3
decorated[m + 1] = '\x00'
while true:
decorated[m] = chr(ord('0') + (k %% 10))
dec(m)
k = k div 10
if k == 0: break
result = getProcAddress(cast[THINSTANCE](lib), decorated)
if result != nil: return
procAddrError(name)
else:
{.error: "no implementation for dyncalls".}
{.pop.}
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