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
|
//===----------- Mangling.cpp -- Name Mangling Utilities for ORC ----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/ExecutionEngine/Orc/Mangling.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Mangler.h"
#include "llvm/Object/MachO.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Debug.h"
#define DEBUG_TYPE "orc"
namespace llvm {
namespace orc {
MangleAndInterner::MangleAndInterner(ExecutionSession &ES, const DataLayout &DL)
: ES(ES), DL(DL) {}
SymbolStringPtr MangleAndInterner::operator()(StringRef Name) {
std::string MangledName;
{
raw_string_ostream MangledNameStream(MangledName);
Mangler::getNameWithPrefix(MangledNameStream, Name, DL);
}
return ES.intern(MangledName);
}
void IRSymbolMapper::add(ExecutionSession &ES, const ManglingOptions &MO,
ArrayRef<GlobalValue *> GVs,
SymbolFlagsMap &SymbolFlags,
SymbolNameToDefinitionMap *SymbolToDefinition) {
if (GVs.empty())
return;
MangleAndInterner Mangle(ES, GVs[0]->getParent()->getDataLayout());
for (auto *G : GVs) {
assert(G && "GVs cannot contain null elements");
if (!G->hasName() || G->isDeclaration() || G->hasLocalLinkage() ||
G->hasAvailableExternallyLinkage() || G->hasAppendingLinkage())
continue;
if (G->isThreadLocal() && MO.EmulatedTLS) {
auto *GV = cast<GlobalVariable>(G);
auto Flags = JITSymbolFlags::fromGlobalValue(*GV);
auto EmuTLSV = Mangle(("__emutls_v." + GV->getName()).str());
SymbolFlags[EmuTLSV] = Flags;
if (SymbolToDefinition)
(*SymbolToDefinition)[EmuTLSV] = GV;
// If this GV has a non-zero initializer we'll need to emit an
// __emutls.t symbol too.
if (GV->hasInitializer()) {
const auto *InitVal = GV->getInitializer();
// Skip zero-initializers.
if (isa<ConstantAggregateZero>(InitVal))
continue;
const auto *InitIntValue = dyn_cast<ConstantInt>(InitVal);
if (InitIntValue && InitIntValue->isZero())
continue;
auto EmuTLST = Mangle(("__emutls_t." + GV->getName()).str());
SymbolFlags[EmuTLST] = Flags;
if (SymbolToDefinition)
(*SymbolToDefinition)[EmuTLST] = GV;
}
continue;
}
// Otherwise we just need a normal linker mangling.
auto MangledName = Mangle(G->getName());
SymbolFlags[MangledName] = JITSymbolFlags::fromGlobalValue(*G);
if (SymbolToDefinition)
(*SymbolToDefinition)[MangledName] = G;
}
}
Expected<std::pair<SymbolFlagsMap, SymbolStringPtr>>
getObjectSymbolInfo(ExecutionSession &ES, MemoryBufferRef ObjBuffer) {
auto Obj = object::ObjectFile::createObjectFile(ObjBuffer);
if (!Obj)
return Obj.takeError();
bool IsMachO = isa<object::MachOObjectFile>(Obj->get());
SymbolFlagsMap SymbolFlags;
for (auto &Sym : (*Obj)->symbols()) {
Expected<uint32_t> SymFlagsOrErr = Sym.getFlags();
if (!SymFlagsOrErr)
// TODO: Test this error.
return SymFlagsOrErr.takeError();
// Skip symbols not defined in this object file.
if (*SymFlagsOrErr & object::BasicSymbolRef::SF_Undefined)
continue;
// Skip symbols that are not global.
if (!(*SymFlagsOrErr & object::BasicSymbolRef::SF_Global))
continue;
// Skip symbols that have type SF_File.
if (auto SymType = Sym.getType()) {
if (*SymType == object::SymbolRef::ST_File)
continue;
} else
return SymType.takeError();
auto Name = Sym.getName();
if (!Name)
return Name.takeError();
auto InternedName = ES.intern(*Name);
auto SymFlags = JITSymbolFlags::fromObjectSymbol(Sym);
if (!SymFlags)
return SymFlags.takeError();
// Strip the 'exported' flag from MachO linker-private symbols.
if (IsMachO && Name->startswith("l"))
*SymFlags &= ~JITSymbolFlags::Exported;
SymbolFlags[InternedName] = std::move(*SymFlags);
}
SymbolStringPtr InitSymbol;
if (IsMachO) {
auto &MachOObj = cast<object::MachOObjectFile>(*Obj->get());
for (auto &Sec : MachOObj.sections()) {
auto SecType = MachOObj.getSectionType(Sec);
if ((SecType & MachO::SECTION_TYPE) == MachO::S_MOD_INIT_FUNC_POINTERS) {
size_t Counter = 0;
while (true) {
std::string InitSymString;
raw_string_ostream(InitSymString)
<< "$." << ObjBuffer.getBufferIdentifier() << ".__inits."
<< Counter++;
InitSymbol = ES.intern(InitSymString);
if (SymbolFlags.count(InitSymbol))
continue;
SymbolFlags[InitSymbol] =
JITSymbolFlags::MaterializationSideEffectsOnly;
break;
}
break;
}
}
}
return std::make_pair(std::move(SymbolFlags), std::move(InitSymbol));
}
} // End namespace orc.
} // End namespace llvm.
|
