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//===- IRObjectFile.cpp - IR object file implementation ---------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Part of the IRObjectFile class implementation.
//
//===----------------------------------------------------------------------===//
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/GVMaterializer.h"
#include "llvm/IR/Mangler.h"
#include "llvm/IR/Module.h"
#include "llvm/Object/IRObjectFile.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
using namespace object;
IRObjectFile::IRObjectFile(std::unique_ptr<MemoryBuffer> Object,
std::error_code &EC, LLVMContext &Context)
: SymbolicFile(Binary::ID_IR, std::move(Object)) {
ErrorOr<Module *> MOrErr = getLazyBitcodeModule(Data.get(), Context);
if ((EC = MOrErr.getError()))
return;
M.reset(MOrErr.get());
// If we have a DataLayout, setup a mangler.
const DataLayout *DL = M->getDataLayout();
if (!DL)
return;
Mang.reset(new Mangler(DL));
}
IRObjectFile::~IRObjectFile() { M->getMaterializer()->releaseBuffer(); }
static const GlobalValue &getGV(DataRefImpl &Symb) {
return *reinterpret_cast<GlobalValue*>(Symb.p & ~uintptr_t(3));
}
static uintptr_t skipEmpty(Module::const_alias_iterator I, const Module &M) {
if (I == M.alias_end())
return 3;
const GlobalValue *GV = &*I;
return reinterpret_cast<uintptr_t>(GV) | 2;
}
static uintptr_t skipEmpty(Module::const_global_iterator I, const Module &M) {
if (I == M.global_end())
return skipEmpty(M.alias_begin(), M);
const GlobalValue *GV = &*I;
return reinterpret_cast<uintptr_t>(GV) | 1;
}
static uintptr_t skipEmpty(Module::const_iterator I, const Module &M) {
if (I == M.end())
return skipEmpty(M.global_begin(), M);
const GlobalValue *GV = &*I;
return reinterpret_cast<uintptr_t>(GV) | 0;
}
void IRObjectFile::moveSymbolNext(DataRefImpl &Symb) const {
const GlobalValue *GV = &getGV(Symb);
const Module &M = *GV->getParent();
uintptr_t Res;
switch (Symb.p & 3) {
case 0: {
Module::const_iterator Iter(static_cast<const Function*>(GV));
++Iter;
Res = skipEmpty(Iter, M);
break;
}
case 1: {
Module::const_global_iterator Iter(static_cast<const GlobalVariable*>(GV));
++Iter;
Res = skipEmpty(Iter, M);
break;
}
case 2: {
Module::const_alias_iterator Iter(static_cast<const GlobalAlias*>(GV));
++Iter;
Res = skipEmpty(Iter, M);
break;
}
case 3:
llvm_unreachable("Invalid symbol reference");
}
Symb.p = Res;
}
std::error_code IRObjectFile::printSymbolName(raw_ostream &OS,
DataRefImpl Symb) const {
const GlobalValue &GV = getGV(Symb);
if (Mang)
Mang->getNameWithPrefix(OS, &GV, false);
else
OS << GV.getName();
return object_error::success;
}
static bool isDeclaration(const GlobalValue &V) {
if (V.hasAvailableExternallyLinkage())
return true;
if (V.isMaterializable())
return false;
return V.isDeclaration();
}
uint32_t IRObjectFile::getSymbolFlags(DataRefImpl Symb) const {
const GlobalValue &GV = getGV(Symb);
uint32_t Res = BasicSymbolRef::SF_None;
if (isDeclaration(GV))
Res |= BasicSymbolRef::SF_Undefined;
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())
Res |= BasicSymbolRef::SF_Weak;
return Res;
}
const GlobalValue &IRObjectFile::getSymbolGV(DataRefImpl Symb) const {
const GlobalValue &GV = getGV(Symb);
return GV;
}
basic_symbol_iterator IRObjectFile::symbol_begin_impl() const {
Module::const_iterator I = M->begin();
DataRefImpl Ret;
Ret.p = skipEmpty(I, *M);
return basic_symbol_iterator(BasicSymbolRef(Ret, this));
}
basic_symbol_iterator IRObjectFile::symbol_end_impl() const {
DataRefImpl Ret;
Ret.p = 3;
return basic_symbol_iterator(BasicSymbolRef(Ret, this));
}
ErrorOr<SymbolicFile *> llvm::object::SymbolicFile::createIRObjectFile(
std::unique_ptr<MemoryBuffer> Object, LLVMContext &Context) {
std::error_code EC;
std::unique_ptr<IRObjectFile> Ret(
new IRObjectFile(std::move(Object), EC, Context));
if (EC)
return EC;
return Ret.release();
}
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