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Object: Extract a ModuleSymbolTable class from IRObjectFile.

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This class represents a symbol table built from in-memory IR. It provides
access to GlobalValues and should only be used if such access is required
(e.g. in the LTO implementation). We will eventually change IRObjectFile
to read from a bitcode symbol table rather than using ModuleSymbolTable,
so it would not be able to expose the module.

Differential Revision: https://reviews.llvm.org/D27073

llvm-svn: 288319
This commit is contained in:
Peter Collingbourne
2016-12-01 06:51:47 +00:00
parent 57f9b8c5b5
commit 863cbfbeba
8 changed files with 262 additions and 168 deletions
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156
llvm/lib/Object/IRObjectFile.cpp
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@@ -37,162 +37,27 @@ using namespace object;
IRObjectFile::IRObjectFile(MemoryBufferRef Object, std::unique_ptr<Module> Mod)
: SymbolicFile(Binary::ID_IR, Object), M(std::move(Mod)) {
Mang.reset(new Mangler());
for (Function &F : *M)
SymTab.push_back(&F);
for (GlobalVariable &GV : M->globals())
SymTab.push_back(&GV);
for (GlobalAlias &GA : M->aliases())
SymTab.push_back(&GA);
CollectAsmUndefinedRefs(Triple(M->getTargetTriple()), M->getModuleInlineAsm(),
[this](StringRef Name, BasicSymbolRef::Flags Flags) {
SymTab.push_back(new (AsmSymbols.Allocate())
AsmSymbol(Name, Flags));
});
}
// Parse inline ASM and collect the list of symbols that are not defined in
// the current module. This is inspired from IRObjectFile.
void IRObjectFile::CollectAsmUndefinedRefs(
const Triple &TT, StringRef InlineAsm,
function_ref<void(StringRef, BasicSymbolRef::Flags)> AsmUndefinedRefs) {
if (InlineAsm.empty())
return;
std::string Err;
const Target *T = TargetRegistry::lookupTarget(TT.str(), Err);
assert(T && T->hasMCAsmParser());
std::unique_ptr<MCRegisterInfo> MRI(T->createMCRegInfo(TT.str()));
if (!MRI)
return;
std::unique_ptr<MCAsmInfo> MAI(T->createMCAsmInfo(*MRI, TT.str()));
if (!MAI)
return;
std::unique_ptr<MCSubtargetInfo> STI(
T->createMCSubtargetInfo(TT.str(), "", ""));
if (!STI)
return;
std::unique_ptr<MCInstrInfo> MCII(T->createMCInstrInfo());
if (!MCII)
return;
MCObjectFileInfo MOFI;
MCContext MCCtx(MAI.get(), MRI.get(), &MOFI);
MOFI.InitMCObjectFileInfo(TT, /*PIC*/ false, CodeModel::Default, MCCtx);
RecordStreamer Streamer(MCCtx);
T->createNullTargetStreamer(Streamer);
std::unique_ptr<MemoryBuffer> Buffer(MemoryBuffer::getMemBuffer(InlineAsm));
SourceMgr SrcMgr;
SrcMgr.AddNewSourceBuffer(std::move(Buffer), SMLoc());
std::unique_ptr<MCAsmParser> Parser(
createMCAsmParser(SrcMgr, MCCtx, Streamer, *MAI));
MCTargetOptions MCOptions;
std::unique_ptr<MCTargetAsmParser> TAP(
T->createMCAsmParser(*STI, *Parser, *MCII, MCOptions));
if (!TAP)
return;
Parser->setTargetParser(*TAP);
if (Parser->Run(false))
return;
for (auto &KV : Streamer) {
StringRef Key = KV.first();
RecordStreamer::State Value = KV.second;
uint32_t Res = BasicSymbolRef::SF_None;
switch (Value) {
case RecordStreamer::NeverSeen:
llvm_unreachable("NeverSeen should have been replaced earlier");
case RecordStreamer::DefinedGlobal:
Res |= BasicSymbolRef::SF_Global;
break;
case RecordStreamer::Defined:
break;
case RecordStreamer::Global:
case RecordStreamer::Used:
Res |= BasicSymbolRef::SF_Undefined;
Res |= BasicSymbolRef::SF_Global;
break;
case RecordStreamer::DefinedWeak:
Res |= BasicSymbolRef::SF_Weak;
Res |= BasicSymbolRef::SF_Global;
break;
case RecordStreamer::UndefinedWeak:
Res |= BasicSymbolRef::SF_Weak;
Res |= BasicSymbolRef::SF_Undefined;
}
AsmUndefinedRefs(Key, BasicSymbolRef::Flags(Res));
}
SymTab.addModule(M.get());
}
IRObjectFile::~IRObjectFile() {}
static ModuleSymbolTable::Symbol getSym(DataRefImpl &Symb) {
return *reinterpret_cast<ModuleSymbolTable::Symbol *>(Symb.p);
}
void IRObjectFile::moveSymbolNext(DataRefImpl &Symb) const {
Symb.p += sizeof(Sym);
Symb.p += sizeof(ModuleSymbolTable::Symbol);
}
std::error_code IRObjectFile::printSymbolName(raw_ostream &OS,
DataRefImpl Symb) const {
Sym S = getSym(Symb);
if (S.is<AsmSymbol *>()) {
OS << S.get<AsmSymbol *>()->first;
return std::error_code();
}
auto *GV = S.get<GlobalValue *>();
if (GV->hasDLLImportStorageClass())
OS << "__imp_";
if (Mang)
Mang->getNameWithPrefix(OS, GV, false);
else
OS << GV->getName();
SymTab.printSymbolName(OS, getSym(Symb));
return std::error_code();
}
uint32_t IRObjectFile::getSymbolFlags(DataRefImpl Symb) const {
Sym S = getSym(Symb);
if (S.is<AsmSymbol *>())
return S.get<AsmSymbol *>()->second;
auto *GV = S.get<GlobalValue *>();
uint32_t Res = BasicSymbolRef::SF_None;
if (GV->isDeclarationForLinker())
Res |= BasicSymbolRef::SF_Undefined;
else if (GV->hasHiddenVisibility() && !GV->hasLocalLinkage())
Res |= BasicSymbolRef::SF_Hidden;
if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV)) {
if (GVar->isConstant())
Res |= BasicSymbolRef::SF_Const;
}
if (GV->hasPrivateLinkage())
Res |= BasicSymbolRef::SF_FormatSpecific;
if (!GV->hasLocalLinkage())
Res |= BasicSymbolRef::SF_Global;
if (GV->hasCommonLinkage())
Res |= BasicSymbolRef::SF_Common;
if (GV->hasLinkOnceLinkage() || GV->hasWeakLinkage() ||
GV->hasExternalWeakLinkage())
Res |= BasicSymbolRef::SF_Weak;
if (GV->getName().startswith("llvm."))
Res |= BasicSymbolRef::SF_FormatSpecific;
else if (auto *Var = dyn_cast<GlobalVariable>(GV)) {
if (Var->getSection() == "llvm.metadata")
Res |= BasicSymbolRef::SF_FormatSpecific;
}
return Res;
return SymTab.getSymbolFlags(getSym(Symb));
}
GlobalValue *IRObjectFile::getSymbolGV(DataRefImpl Symb) {
@@ -203,13 +68,14 @@ std::unique_ptr<Module> IRObjectFile::takeModule() { return std::move(M); }
basic_symbol_iterator IRObjectFile::symbol_begin() const {
DataRefImpl Ret;
Ret.p = reinterpret_cast<uintptr_t>(SymTab.data());
Ret.p = reinterpret_cast<uintptr_t>(SymTab.symbols().data());
return basic_symbol_iterator(BasicSymbolRef(Ret, this));
}
basic_symbol_iterator IRObjectFile::symbol_end() const {
DataRefImpl Ret;
Ret.p = reinterpret_cast<uintptr_t>(SymTab.data() + SymTab.size());
Ret.p = reinterpret_cast<uintptr_t>(SymTab.symbols().data() +
SymTab.symbols().size());
return basic_symbol_iterator(BasicSymbolRef(Ret, this));
}