1//===----------- Mangling.cpp -- Name Mangling Utilities for ORC ----------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "llvm/ExecutionEngine/Orc/Mangling.h"
10#include "llvm/IR/Constants.h"
11#include "llvm/IR/Mangler.h"
12#include "llvm/Support/Debug.h"
13
14#define DEBUG_TYPE "orc"
15
16namespace llvm {
17namespace orc {
18
19MangleAndInterner::MangleAndInterner(ExecutionSession &ES, const DataLayout &DL)
20 : ES(ES), DL(DL) {}
21
22SymbolStringPtr MangleAndInterner::operator()(StringRef Name) {
23 std::string MangledName;
24 {
25 raw_string_ostream MangledNameStream(MangledName);
26 Mangler::getNameWithPrefix(OS&: MangledNameStream, GVName: Name, DL);
27 }
28 return ES.intern(SymName: MangledName);
29}
30
31void IRSymbolMapper::add(ExecutionSession &ES, const ManglingOptions &MO,
32 ArrayRef<GlobalValue *> GVs,
33 SymbolFlagsMap &SymbolFlags,
34 SymbolNameToDefinitionMap *SymbolToDefinition) {
35 if (GVs.empty())
36 return;
37
38 MangleAndInterner Mangle(ES, GVs[0]->getDataLayout());
39 for (auto *G : GVs) {
40 assert(G && "GVs cannot contain null elements");
41 if (!G->hasName() || G->isDeclaration() || G->hasLocalLinkage() ||
42 G->hasAvailableExternallyLinkage() || G->hasAppendingLinkage())
43 continue;
44
45 if (G->isThreadLocal() && MO.EmulatedTLS) {
46 auto *GV = cast<GlobalVariable>(Val: G);
47
48 auto Flags = JITSymbolFlags::fromGlobalValue(GV: *GV);
49
50 auto EmuTLSV = Mangle(("__emutls_v." + GV->getName()).str());
51 SymbolFlags[EmuTLSV] = Flags;
52 if (SymbolToDefinition)
53 (*SymbolToDefinition)[EmuTLSV] = GV;
54
55 // If this GV has a non-zero initializer we'll need to emit an
56 // __emutls.t symbol too.
57 if (GV->hasInitializer()) {
58 const auto *InitVal = GV->getInitializer();
59
60 // Skip zero-initializers.
61 if (isa<ConstantAggregateZero>(Val: InitVal))
62 continue;
63 const auto *InitIntValue = dyn_cast<ConstantInt>(Val: InitVal);
64 if (InitIntValue && InitIntValue->isZero())
65 continue;
66
67 auto EmuTLST = Mangle(("__emutls_t." + GV->getName()).str());
68 SymbolFlags[EmuTLST] = Flags;
69 if (SymbolToDefinition)
70 (*SymbolToDefinition)[EmuTLST] = GV;
71 }
72 continue;
73 }
74
75 // Otherwise we just need a normal linker mangling.
76 auto MangledName = Mangle(G->getName());
77 SymbolFlags[MangledName] = JITSymbolFlags::fromGlobalValue(GV: *G);
78 if (SymbolToDefinition)
79 (*SymbolToDefinition)[MangledName] = G;
80 }
81}
82
83} // End namespace orc.
84} // End namespace llvm.
85