1 //===- ModuleSymbolTable.cpp - symbol table for in-memory IR --------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This class represents a symbol table built from in-memory IR. It provides
11 // access to GlobalValues and should only be used if such access is required
12 // (e.g. in the LTO implementation).
14 //===----------------------------------------------------------------------===//
16 #include "llvm/Object/ModuleSymbolTable.h"
17 #include "RecordStreamer.h"
18 #include "llvm/ADT/STLExtras.h"
19 #include "llvm/ADT/SmallString.h"
20 #include "llvm/ADT/StringMap.h"
21 #include "llvm/ADT/StringRef.h"
22 #include "llvm/ADT/Triple.h"
23 #include "llvm/IR/Function.h"
24 #include "llvm/IR/GlobalAlias.h"
25 #include "llvm/IR/GlobalValue.h"
26 #include "llvm/IR/GlobalVariable.h"
27 #include "llvm/IR/Module.h"
28 #include "llvm/MC/MCAsmInfo.h"
29 #include "llvm/MC/MCContext.h"
30 #include "llvm/MC/MCDirectives.h"
31 #include "llvm/MC/MCInstrInfo.h"
32 #include "llvm/MC/MCObjectFileInfo.h"
33 #include "llvm/MC/MCParser/MCAsmParser.h"
34 #include "llvm/MC/MCParser/MCTargetAsmParser.h"
35 #include "llvm/MC/MCRegisterInfo.h"
36 #include "llvm/MC/MCSubtargetInfo.h"
37 #include "llvm/MC/MCSymbol.h"
38 #include "llvm/MC/MCTargetOptions.h"
39 #include "llvm/Object/SymbolicFile.h"
40 #include "llvm/Support/Casting.h"
41 #include "llvm/Support/CodeGen.h"
42 #include "llvm/Support/ErrorHandling.h"
43 #include "llvm/Support/MemoryBuffer.h"
44 #include "llvm/Support/SMLoc.h"
45 #include "llvm/Support/SourceMgr.h"
46 #include "llvm/Support/TargetRegistry.h"
47 #include "llvm/Support/raw_ostream.h"
55 using namespace object;
57 void ModuleSymbolTable::addModule(Module *M) {
59 assert(FirstMod->getTargetTriple() == M->getTargetTriple());
63 for (GlobalValue &GV : M->global_values())
64 SymTab.push_back(&GV);
66 CollectAsmSymbols(*M, [this](StringRef Name, BasicSymbolRef::Flags Flags) {
67 SymTab.push_back(new (AsmSymbols.Allocate()) AsmSymbol(Name, Flags));
72 initializeRecordStreamer(const Module &M,
73 function_ref<void(RecordStreamer &)> Init) {
74 StringRef InlineAsm = M.getModuleInlineAsm();
75 if (InlineAsm.empty())
79 const Triple TT(M.getTargetTriple());
80 const Target *T = TargetRegistry::lookupTarget(TT.str(), Err);
81 assert(T && T->hasMCAsmParser());
83 std::unique_ptr<MCRegisterInfo> MRI(T->createMCRegInfo(TT.str()));
87 std::unique_ptr<MCAsmInfo> MAI(T->createMCAsmInfo(*MRI, TT.str()));
91 std::unique_ptr<MCSubtargetInfo> STI(
92 T->createMCSubtargetInfo(TT.str(), "", ""));
96 std::unique_ptr<MCInstrInfo> MCII(T->createMCInstrInfo());
100 MCObjectFileInfo MOFI;
101 MCContext MCCtx(MAI.get(), MRI.get(), &MOFI);
102 MOFI.InitMCObjectFileInfo(TT, /*PIC*/ false, MCCtx);
103 MOFI.setSDKVersion(M.getSDKVersion());
104 RecordStreamer Streamer(MCCtx, M);
105 T->createNullTargetStreamer(Streamer);
107 std::unique_ptr<MemoryBuffer> Buffer(MemoryBuffer::getMemBuffer(InlineAsm));
109 SrcMgr.AddNewSourceBuffer(std::move(Buffer), SMLoc());
110 std::unique_ptr<MCAsmParser> Parser(
111 createMCAsmParser(SrcMgr, MCCtx, Streamer, *MAI));
113 MCTargetOptions MCOptions;
114 std::unique_ptr<MCTargetAsmParser> TAP(
115 T->createMCAsmParser(*STI, *Parser, *MCII, MCOptions));
119 Parser->setTargetParser(*TAP);
120 if (Parser->Run(false))
126 void ModuleSymbolTable::CollectAsmSymbols(
128 function_ref<void(StringRef, BasicSymbolRef::Flags)> AsmSymbol) {
129 initializeRecordStreamer(M, [&](RecordStreamer &Streamer) {
130 Streamer.flushSymverDirectives();
132 for (auto &KV : Streamer) {
133 StringRef Key = KV.first();
134 RecordStreamer::State Value = KV.second;
135 // FIXME: For now we just assume that all asm symbols are executable.
136 uint32_t Res = BasicSymbolRef::SF_Executable;
138 case RecordStreamer::NeverSeen:
139 llvm_unreachable("NeverSeen should have been replaced earlier");
140 case RecordStreamer::DefinedGlobal:
141 Res |= BasicSymbolRef::SF_Global;
143 case RecordStreamer::Defined:
145 case RecordStreamer::Global:
146 case RecordStreamer::Used:
147 Res |= BasicSymbolRef::SF_Undefined;
148 Res |= BasicSymbolRef::SF_Global;
150 case RecordStreamer::DefinedWeak:
151 Res |= BasicSymbolRef::SF_Weak;
152 Res |= BasicSymbolRef::SF_Global;
154 case RecordStreamer::UndefinedWeak:
155 Res |= BasicSymbolRef::SF_Weak;
156 Res |= BasicSymbolRef::SF_Undefined;
158 AsmSymbol(Key, BasicSymbolRef::Flags(Res));
163 void ModuleSymbolTable::CollectAsmSymvers(
164 const Module &M, function_ref<void(StringRef, StringRef)> AsmSymver) {
165 initializeRecordStreamer(M, [&](RecordStreamer &Streamer) {
166 for (auto &KV : Streamer.symverAliases())
167 for (auto &Alias : KV.second)
168 AsmSymver(KV.first->getName(), Alias);
172 void ModuleSymbolTable::printSymbolName(raw_ostream &OS, Symbol S) const {
173 if (S.is<AsmSymbol *>()) {
174 OS << S.get<AsmSymbol *>()->first;
178 auto *GV = S.get<GlobalValue *>();
179 if (GV->hasDLLImportStorageClass())
182 Mang.getNameWithPrefix(OS, GV, false);
185 uint32_t ModuleSymbolTable::getSymbolFlags(Symbol S) const {
186 if (S.is<AsmSymbol *>())
187 return S.get<AsmSymbol *>()->second;
189 auto *GV = S.get<GlobalValue *>();
191 uint32_t Res = BasicSymbolRef::SF_None;
192 if (GV->isDeclarationForLinker())
193 Res |= BasicSymbolRef::SF_Undefined;
194 else if (GV->hasHiddenVisibility() && !GV->hasLocalLinkage())
195 Res |= BasicSymbolRef::SF_Hidden;
196 if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV)) {
197 if (GVar->isConstant())
198 Res |= BasicSymbolRef::SF_Const;
200 if (dyn_cast_or_null<Function>(GV->getBaseObject()))
201 Res |= BasicSymbolRef::SF_Executable;
202 if (isa<GlobalAlias>(GV))
203 Res |= BasicSymbolRef::SF_Indirect;
204 if (GV->hasPrivateLinkage())
205 Res |= BasicSymbolRef::SF_FormatSpecific;
206 if (!GV->hasLocalLinkage())
207 Res |= BasicSymbolRef::SF_Global;
208 if (GV->hasCommonLinkage())
209 Res |= BasicSymbolRef::SF_Common;
210 if (GV->hasLinkOnceLinkage() || GV->hasWeakLinkage() ||
211 GV->hasExternalWeakLinkage())
212 Res |= BasicSymbolRef::SF_Weak;
214 if (GV->getName().startswith("llvm."))
215 Res |= BasicSymbolRef::SF_FormatSpecific;
216 else if (auto *Var = dyn_cast<GlobalVariable>(GV)) {
217 if (Var->getSection() == "llvm.metadata")
218 Res |= BasicSymbolRef::SF_FormatSpecific;