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
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
//===-- DynamicLibrary.cpp - Runtime link/load libraries --------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Reid Spencer and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This header file implements the operating system DynamicLibrary concept.
//
//===----------------------------------------------------------------------===//
#include "llvm/System/DynamicLibrary.h"
#include "llvm/Config/config.h"
#include <map>
// Collection of symbol name/value pairs to be searched prior to any libraries.
static std::map<std::string, void *> g_symbols;
void llvm::sys::DynamicLibrary::AddSymbol(const char* symbolName,
void *symbolValue) {
g_symbols[symbolName] = symbolValue;
}
// It is not possible to use ltdl.c on VC++ builds as the terms of its LGPL
// license and special exception would cause all of LLVM to be placed under
// the LGPL. This is because the exception applies only when libtool is
// used, and obviously libtool is not used with Visual Studio. An entirely
// separate implementation is provided in win32/DynamicLibrary.cpp.
#ifdef LLVM_ON_WIN32
#include "Win32/DynamicLibrary.inc"
#else
#include "ltdl.h"
#include <cassert>
using namespace llvm;
using namespace llvm::sys;
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only TRULY operating system
//=== independent code.
//===----------------------------------------------------------------------===//
static inline void check_ltdl_initialization() {
static bool did_initialize_ltdl = false;
if (!did_initialize_ltdl) {
int Err = lt_dlinit();
assert(0 == Err && "Can't init the ltdl library");
did_initialize_ltdl = true;
}
}
static std::vector<lt_dlhandle> OpenedHandles;
DynamicLibrary::DynamicLibrary() : handle(0) {
check_ltdl_initialization();
lt_dlhandle a_handle = lt_dlopen(0);
assert(a_handle == 0 || "Can't open program as dynamic library");
handle = a_handle;
OpenedHandles.push_back(a_handle);
}
/*
DynamicLibrary::DynamicLibrary(const char*filename) : handle(0) {
check_ltdl_initialization();
lt_dlhandle a_handle = lt_dlopen(filename);
if (a_handle == 0)
a_handle = lt_dlopenext(filename);
if (a_handle == 0)
throw std::string("Can't open :") + filename + ": " + lt_dlerror();
handle = a_handle;
OpenedHandles.push_back(a_handle);
}
*/
DynamicLibrary::~DynamicLibrary() {
lt_dlhandle a_handle = (lt_dlhandle) handle;
if (a_handle) {
lt_dlclose(a_handle);
for (std::vector<lt_dlhandle>::iterator I = OpenedHandles.begin(),
E = OpenedHandles.end(); I != E; ++I) {
if (*I == a_handle) {
// Note: don't use the swap/pop_back trick here. Order is important.
OpenedHandles.erase(I);
return;
}
}
}
}
bool DynamicLibrary::LoadLibraryPermanently(const char *Filename,
std::string *ErrMsg) {
check_ltdl_initialization();
lt_dlhandle a_handle = lt_dlopen(Filename);
if (a_handle == 0)
a_handle = lt_dlopenext(Filename);
if (a_handle == 0) {
if (ErrMsg)
*ErrMsg = std::string("Can't open :") +
(Filename ? Filename : "<current process>") + ": " + lt_dlerror();
return true;
}
lt_dlmakeresident(a_handle);
OpenedHandles.push_back(a_handle);
return false;
}
void* DynamicLibrary::SearchForAddressOfSymbol(const char* symbolName) {
check_ltdl_initialization();
// First check symbols added via AddSymbol().
std::map<std::string, void *>::iterator I = g_symbols.find(symbolName);
if (I != g_symbols.end())
return I->second;
// Now search the libraries.
for (std::vector<lt_dlhandle>::iterator I = OpenedHandles.begin(),
E = OpenedHandles.end(); I != E; ++I) {
lt_ptr ptr = lt_dlsym(*I, symbolName);
if (ptr)
return ptr;
}
// If this is darwin, it has some funky issues, try to solve them here. Some
// important symbols are marked 'private external' which doesn't allow
// SearchForAddressOfSymbol to find them. As such, we special case them here,
// there is only a small handful of them.
#ifdef __APPLE__
#define EXPLICIT_SYMBOL(SYM) \
extern void *SYM; if (!strcmp(symbolName, #SYM)) return &SYM
{
EXPLICIT_SYMBOL(__ashldi3);
EXPLICIT_SYMBOL(__ashrdi3);
EXPLICIT_SYMBOL(__cmpdi2);
EXPLICIT_SYMBOL(__divdi3);
EXPLICIT_SYMBOL(__eprintf);
EXPLICIT_SYMBOL(__fixdfdi);
EXPLICIT_SYMBOL(__fixsfdi);
EXPLICIT_SYMBOL(__fixunsdfdi);
EXPLICIT_SYMBOL(__fixunssfdi);
EXPLICIT_SYMBOL(__floatdidf);
EXPLICIT_SYMBOL(__floatdisf);
EXPLICIT_SYMBOL(__lshrdi3);
EXPLICIT_SYMBOL(__moddi3);
EXPLICIT_SYMBOL(__udivdi3);
EXPLICIT_SYMBOL(__umoddi3);
}
#undef EXPLICIT_SYMBOL
#endif
#define EXPLICIT_SYMBOL(SYM) \
if (!strcmp(symbolName, #SYM)) return &SYM
// Try a few well known symbols just to give lli a shot at working.
// Note that on some systems stdin, etc. are macros so we have to
// avoid attempting to take the address of a macro :)
{
#ifndef stdin
EXPLICIT_SYMBOL(stdin);
#endif
#ifndef stdout
EXPLICIT_SYMBOL(stdout);
#endif
#ifndef stderr
EXPLICIT_SYMBOL(stderr);
#endif
}
#undef EXPLICIT_SYMBOL
return 0;
}
void *DynamicLibrary::GetAddressOfSymbol(const char *symbolName) {
assert(handle != 0 && "Invalid DynamicLibrary handle");
return lt_dlsym((lt_dlhandle) handle, symbolName);
}
#endif // LLVM_ON_WIN32
DEFINING_FILE_FOR(SystemDynamicLibrary)
|
