1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
#
#
# Nimrod's Runtime Library
# (c) Copyright 2010 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.
const
NilLibHandle: TLibHandle = nil
proc rawWrite(f: TFile, 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:
#stdout.write("could not load: ")
#quit(path)
stdout.rawWrite("could not load: ")
stdout.rawWrite(path)
stdout.rawWrite("\n")
quit(1)
proc ProcAddrError(name: cstring) {.noinline.} =
# carefully written to avoid memory allocation:
stdout.rawWrite("could not import: ")
stdout.write(name)
stdout.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:
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 dlerror(): cstring {.importc, header: "<dlfcn.h>".}
proc nimUnloadLibrary(lib: TLibHandle) =
dlclose(lib)
proc nimLoadLibrary(path: string): TLibHandle =
result = dlopen(path, RTLD_NOW)
#c_fprintf(c_stdout, "%s\n", dlerror())
proc nimGetProcAddr(lib: TLibHandle, name: cstring): TProcAddr =
result = dlsym(lib, name)
if result == nil: ProcAddrError(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: ProcAddrError(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: ProcAddrError(name)
else:
{.error: "no implementation for dyncalls".}
|