Object: Extract a ModuleSymbolTable class from IRObjectFile.
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
184
llvm/lib/Object/ModuleSymbolTable.cpp
Normal file
184
llvm/lib/Object/ModuleSymbolTable.cpp
Normal file
@@ -0,0 +1,184 @@
|
||||
//===- ModuleSymbolTable.cpp - symbol table for in-memory IR ----*- C++ -*-===//
|
||||
//
|
||||
// The LLVM Compiler Infrastructure
|
||||
//
|
||||
// This file is distributed under the University of Illinois Open Source
|
||||
// License. See LICENSE.TXT for details.
|
||||
//
|
||||
//===----------------------------------------------------------------------===//
|
||||
//
|
||||
// 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).
|
||||
//
|
||||
//===----------------------------------------------------------------------===//
|
||||
|
||||
#include "llvm/Object/IRObjectFile.h"
|
||||
#include "RecordStreamer.h"
|
||||
#include "llvm/ADT/STLExtras.h"
|
||||
#include "llvm/Bitcode/BitcodeReader.h"
|
||||
#include "llvm/IR/GVMaterializer.h"
|
||||
#include "llvm/IR/LLVMContext.h"
|
||||
#include "llvm/IR/Mangler.h"
|
||||
#include "llvm/IR/Module.h"
|
||||
#include "llvm/MC/MCAsmInfo.h"
|
||||
#include "llvm/MC/MCContext.h"
|
||||
#include "llvm/MC/MCInstrInfo.h"
|
||||
#include "llvm/MC/MCObjectFileInfo.h"
|
||||
#include "llvm/MC/MCParser/MCAsmParser.h"
|
||||
#include "llvm/MC/MCParser/MCTargetAsmParser.h"
|
||||
#include "llvm/MC/MCRegisterInfo.h"
|
||||
#include "llvm/MC/MCSubtargetInfo.h"
|
||||
#include "llvm/Object/ObjectFile.h"
|
||||
#include "llvm/Support/MemoryBuffer.h"
|
||||
#include "llvm/Support/SourceMgr.h"
|
||||
#include "llvm/Support/TargetRegistry.h"
|
||||
#include "llvm/Support/raw_ostream.h"
|
||||
using namespace llvm;
|
||||
using namespace object;
|
||||
|
||||
void ModuleSymbolTable::addModule(Module *M) {
|
||||
if (FirstMod)
|
||||
assert(FirstMod->getTargetTriple() == M->getTargetTriple());
|
||||
else
|
||||
FirstMod = M;
|
||||
|
||||
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);
|
||||
|
||||
CollectAsmSymbols(Triple(M->getTargetTriple()), M->getModuleInlineAsm(),
|
||||
[this](StringRef Name, BasicSymbolRef::Flags Flags) {
|
||||
SymTab.push_back(new (AsmSymbols.Allocate())
|
||||
AsmSymbol(Name, Flags));
|
||||
});
|
||||
}
|
||||
|
||||
void ModuleSymbolTable::CollectAsmSymbols(
|
||||
const Triple &TT, StringRef InlineAsm,
|
||||
function_ref<void(StringRef, BasicSymbolRef::Flags)> AsmSymbol) {
|
||||
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;
|
||||
}
|
||||
AsmSymbol(Key, BasicSymbolRef::Flags(Res));
|
||||
}
|
||||
}
|
||||
|
||||
void ModuleSymbolTable::printSymbolName(raw_ostream &OS, Symbol S) const {
|
||||
if (S.is<AsmSymbol *>()) {
|
||||
OS << S.get<AsmSymbol *>()->first;
|
||||
return;
|
||||
}
|
||||
|
||||
auto *GV = S.get<GlobalValue *>();
|
||||
if (GV->hasDLLImportStorageClass())
|
||||
OS << "__imp_";
|
||||
|
||||
Mang.getNameWithPrefix(OS, GV, false);
|
||||
}
|
||||
|
||||
uint32_t ModuleSymbolTable::getSymbolFlags(Symbol S) const {
|
||||
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;
|
||||
}
|
||||
Reference in New Issue
Block a user