mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-29 13:29:28 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146377 91177308-0d34-0410-b5e6-96231b3b80d8
395 lines
13 KiB
C++
395 lines
13 KiB
C++
//===- lib/MC/MCELFStreamer.cpp - ELF Object Output ------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file assembles .s files and emits ELF .o object files.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "MCELFStreamer.h"
|
|
#include "MCELF.h"
|
|
#include "llvm/MC/MCStreamer.h"
|
|
#include "llvm/MC/MCCodeEmitter.h"
|
|
#include "llvm/MC/MCELFSymbolFlags.h"
|
|
#include "llvm/MC/MCExpr.h"
|
|
#include "llvm/MC/MCInst.h"
|
|
#include "llvm/MC/MCSection.h"
|
|
#include "llvm/MC/MCSymbol.h"
|
|
#include "llvm/MC/MCValue.h"
|
|
#include "llvm/MC/MCAsmBackend.h"
|
|
#include "llvm/Support/Debug.h"
|
|
#include "llvm/Support/ELF.h"
|
|
#include "llvm/Support/ErrorHandling.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
|
|
using namespace llvm;
|
|
|
|
void MCELFStreamer::InitSections() {
|
|
// This emulates the same behavior of GNU as. This makes it easier
|
|
// to compare the output as the major sections are in the same order.
|
|
SetSectionText();
|
|
SetSectionData();
|
|
SetSectionBss();
|
|
SetSectionText();
|
|
}
|
|
|
|
void MCELFStreamer::EmitLabel(MCSymbol *Symbol) {
|
|
assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
|
|
|
|
MCObjectStreamer::EmitLabel(Symbol);
|
|
|
|
const MCSectionELF &Section =
|
|
static_cast<const MCSectionELF&>(Symbol->getSection());
|
|
MCSymbolData &SD = getAssembler().getSymbolData(*Symbol);
|
|
if (Section.getFlags() & ELF::SHF_TLS)
|
|
MCELF::SetType(SD, ELF::STT_TLS);
|
|
}
|
|
|
|
void MCELFStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
|
|
switch (Flag) {
|
|
case MCAF_SyntaxUnified: return; // no-op here.
|
|
case MCAF_Code16: return; // Change parsing mode; no-op here.
|
|
case MCAF_Code32: return; // Change parsing mode; no-op here.
|
|
case MCAF_Code64: return; // Change parsing mode; no-op here.
|
|
case MCAF_SubsectionsViaSymbols:
|
|
getAssembler().setSubsectionsViaSymbols(true);
|
|
return;
|
|
}
|
|
|
|
assert(0 && "invalid assembler flag!");
|
|
}
|
|
|
|
void MCELFStreamer::EmitThumbFunc(MCSymbol *Func) {
|
|
// FIXME: Anything needed here to flag the function as thumb?
|
|
|
|
getAssembler().setIsThumbFunc(Func);
|
|
|
|
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Func);
|
|
SD.setFlags(SD.getFlags() | ELF_Other_ThumbFunc);
|
|
}
|
|
|
|
void MCELFStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
|
|
// TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
|
|
// MCObjectStreamer.
|
|
// FIXME: Lift context changes into super class.
|
|
getAssembler().getOrCreateSymbolData(*Symbol);
|
|
Symbol->setVariableValue(AddValueSymbols(Value));
|
|
}
|
|
|
|
void MCELFStreamer::ChangeSection(const MCSection *Section) {
|
|
const MCSymbol *Grp = static_cast<const MCSectionELF *>(Section)->getGroup();
|
|
if (Grp)
|
|
getAssembler().getOrCreateSymbolData(*Grp);
|
|
this->MCObjectStreamer::ChangeSection(Section);
|
|
}
|
|
|
|
void MCELFStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
|
|
getAssembler().getOrCreateSymbolData(*Symbol);
|
|
MCSymbolData &AliasSD = getAssembler().getOrCreateSymbolData(*Alias);
|
|
AliasSD.setFlags(AliasSD.getFlags() | ELF_Other_Weakref);
|
|
const MCExpr *Value = MCSymbolRefExpr::Create(Symbol, getContext());
|
|
Alias->setVariableValue(Value);
|
|
}
|
|
|
|
void MCELFStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
|
|
MCSymbolAttr Attribute) {
|
|
// Indirect symbols are handled differently, to match how 'as' handles
|
|
// them. This makes writing matching .o files easier.
|
|
if (Attribute == MCSA_IndirectSymbol) {
|
|
// Note that we intentionally cannot use the symbol data here; this is
|
|
// important for matching the string table that 'as' generates.
|
|
IndirectSymbolData ISD;
|
|
ISD.Symbol = Symbol;
|
|
ISD.SectionData = getCurrentSectionData();
|
|
getAssembler().getIndirectSymbols().push_back(ISD);
|
|
return;
|
|
}
|
|
|
|
// Adding a symbol attribute always introduces the symbol, note that an
|
|
// important side effect of calling getOrCreateSymbolData here is to register
|
|
// the symbol with the assembler.
|
|
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
|
|
|
|
// The implementation of symbol attributes is designed to match 'as', but it
|
|
// leaves much to desired. It doesn't really make sense to arbitrarily add and
|
|
// remove flags, but 'as' allows this (in particular, see .desc).
|
|
//
|
|
// In the future it might be worth trying to make these operations more well
|
|
// defined.
|
|
switch (Attribute) {
|
|
case MCSA_LazyReference:
|
|
case MCSA_Reference:
|
|
case MCSA_NoDeadStrip:
|
|
case MCSA_SymbolResolver:
|
|
case MCSA_PrivateExtern:
|
|
case MCSA_WeakDefinition:
|
|
case MCSA_WeakDefAutoPrivate:
|
|
case MCSA_Invalid:
|
|
case MCSA_IndirectSymbol:
|
|
assert(0 && "Invalid symbol attribute for ELF!");
|
|
break;
|
|
|
|
case MCSA_ELF_TypeGnuUniqueObject:
|
|
// Ignore for now.
|
|
break;
|
|
|
|
case MCSA_Global:
|
|
MCELF::SetBinding(SD, ELF::STB_GLOBAL);
|
|
SD.setExternal(true);
|
|
BindingExplicitlySet.insert(Symbol);
|
|
break;
|
|
|
|
case MCSA_WeakReference:
|
|
case MCSA_Weak:
|
|
MCELF::SetBinding(SD, ELF::STB_WEAK);
|
|
SD.setExternal(true);
|
|
BindingExplicitlySet.insert(Symbol);
|
|
break;
|
|
|
|
case MCSA_Local:
|
|
MCELF::SetBinding(SD, ELF::STB_LOCAL);
|
|
SD.setExternal(false);
|
|
BindingExplicitlySet.insert(Symbol);
|
|
break;
|
|
|
|
case MCSA_ELF_TypeFunction:
|
|
MCELF::SetType(SD, ELF::STT_FUNC);
|
|
break;
|
|
|
|
case MCSA_ELF_TypeIndFunction:
|
|
MCELF::SetType(SD, ELF::STT_GNU_IFUNC);
|
|
break;
|
|
|
|
case MCSA_ELF_TypeObject:
|
|
MCELF::SetType(SD, ELF::STT_OBJECT);
|
|
break;
|
|
|
|
case MCSA_ELF_TypeTLS:
|
|
MCELF::SetType(SD, ELF::STT_TLS);
|
|
break;
|
|
|
|
case MCSA_ELF_TypeCommon:
|
|
MCELF::SetType(SD, ELF::STT_COMMON);
|
|
break;
|
|
|
|
case MCSA_ELF_TypeNoType:
|
|
MCELF::SetType(SD, ELF::STT_NOTYPE);
|
|
break;
|
|
|
|
case MCSA_Protected:
|
|
MCELF::SetVisibility(SD, ELF::STV_PROTECTED);
|
|
break;
|
|
|
|
case MCSA_Hidden:
|
|
MCELF::SetVisibility(SD, ELF::STV_HIDDEN);
|
|
break;
|
|
|
|
case MCSA_Internal:
|
|
MCELF::SetVisibility(SD, ELF::STV_INTERNAL);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void MCELFStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
|
|
unsigned ByteAlignment) {
|
|
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
|
|
|
|
if (!BindingExplicitlySet.count(Symbol)) {
|
|
MCELF::SetBinding(SD, ELF::STB_GLOBAL);
|
|
SD.setExternal(true);
|
|
}
|
|
|
|
MCELF::SetType(SD, ELF::STT_OBJECT);
|
|
|
|
if (MCELF::GetBinding(SD) == ELF_STB_Local) {
|
|
const MCSection *Section = getAssembler().getContext().getELFSection(".bss",
|
|
ELF::SHT_NOBITS,
|
|
ELF::SHF_WRITE |
|
|
ELF::SHF_ALLOC,
|
|
SectionKind::getBSS());
|
|
Symbol->setSection(*Section);
|
|
|
|
struct LocalCommon L = {&SD, Size, ByteAlignment};
|
|
LocalCommons.push_back(L);
|
|
} else {
|
|
SD.setCommon(Size, ByteAlignment);
|
|
}
|
|
|
|
SD.setSize(MCConstantExpr::Create(Size, getContext()));
|
|
}
|
|
|
|
void MCELFStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
|
|
unsigned ByteAlignment) {
|
|
// FIXME: Should this be caught and done earlier?
|
|
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
|
|
MCELF::SetBinding(SD, ELF::STB_LOCAL);
|
|
SD.setExternal(false);
|
|
BindingExplicitlySet.insert(Symbol);
|
|
EmitCommonSymbol(Symbol, Size, ByteAlignment);
|
|
}
|
|
|
|
void MCELFStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
|
|
// TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
|
|
// MCObjectStreamer.
|
|
getOrCreateDataFragment()->getContents().append(Data.begin(), Data.end());
|
|
}
|
|
|
|
void MCELFStreamer::EmitValueToAlignment(unsigned ByteAlignment,
|
|
int64_t Value, unsigned ValueSize,
|
|
unsigned MaxBytesToEmit) {
|
|
// TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
|
|
// MCObjectStreamer.
|
|
if (MaxBytesToEmit == 0)
|
|
MaxBytesToEmit = ByteAlignment;
|
|
new MCAlignFragment(ByteAlignment, Value, ValueSize, MaxBytesToEmit,
|
|
getCurrentSectionData());
|
|
|
|
// Update the maximum alignment on the current section if necessary.
|
|
if (ByteAlignment > getCurrentSectionData()->getAlignment())
|
|
getCurrentSectionData()->setAlignment(ByteAlignment);
|
|
}
|
|
|
|
void MCELFStreamer::EmitCodeAlignment(unsigned ByteAlignment,
|
|
unsigned MaxBytesToEmit) {
|
|
// TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
|
|
// MCObjectStreamer.
|
|
if (MaxBytesToEmit == 0)
|
|
MaxBytesToEmit = ByteAlignment;
|
|
MCAlignFragment *F = new MCAlignFragment(ByteAlignment, 0, 1, MaxBytesToEmit,
|
|
getCurrentSectionData());
|
|
F->setEmitNops(true);
|
|
|
|
// Update the maximum alignment on the current section if necessary.
|
|
if (ByteAlignment > getCurrentSectionData()->getAlignment())
|
|
getCurrentSectionData()->setAlignment(ByteAlignment);
|
|
}
|
|
|
|
// Add a symbol for the file name of this module. This is the second
|
|
// entry in the module's symbol table (the first being the null symbol).
|
|
void MCELFStreamer::EmitFileDirective(StringRef Filename) {
|
|
MCSymbol *Symbol = getAssembler().getContext().GetOrCreateSymbol(Filename);
|
|
Symbol->setSection(*getCurrentSection());
|
|
Symbol->setAbsolute();
|
|
|
|
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
|
|
|
|
SD.setFlags(ELF_STT_File | ELF_STB_Local | ELF_STV_Default);
|
|
}
|
|
|
|
void MCELFStreamer::fixSymbolsInTLSFixups(const MCExpr *expr) {
|
|
switch (expr->getKind()) {
|
|
case MCExpr::Target: llvm_unreachable("Can't handle target exprs yet!");
|
|
case MCExpr::Constant:
|
|
break;
|
|
|
|
case MCExpr::Binary: {
|
|
const MCBinaryExpr *be = cast<MCBinaryExpr>(expr);
|
|
fixSymbolsInTLSFixups(be->getLHS());
|
|
fixSymbolsInTLSFixups(be->getRHS());
|
|
break;
|
|
}
|
|
|
|
case MCExpr::SymbolRef: {
|
|
const MCSymbolRefExpr &symRef = *cast<MCSymbolRefExpr>(expr);
|
|
switch (symRef.getKind()) {
|
|
default:
|
|
return;
|
|
case MCSymbolRefExpr::VK_GOTTPOFF:
|
|
case MCSymbolRefExpr::VK_INDNTPOFF:
|
|
case MCSymbolRefExpr::VK_NTPOFF:
|
|
case MCSymbolRefExpr::VK_GOTNTPOFF:
|
|
case MCSymbolRefExpr::VK_TLSGD:
|
|
case MCSymbolRefExpr::VK_TLSLD:
|
|
case MCSymbolRefExpr::VK_TLSLDM:
|
|
case MCSymbolRefExpr::VK_TPOFF:
|
|
case MCSymbolRefExpr::VK_DTPOFF:
|
|
case MCSymbolRefExpr::VK_ARM_TLSGD:
|
|
case MCSymbolRefExpr::VK_ARM_TPOFF:
|
|
case MCSymbolRefExpr::VK_ARM_GOTTPOFF:
|
|
case MCSymbolRefExpr::VK_Mips_TLSGD:
|
|
case MCSymbolRefExpr::VK_Mips_GOTTPREL:
|
|
case MCSymbolRefExpr::VK_Mips_TPREL_HI:
|
|
case MCSymbolRefExpr::VK_Mips_TPREL_LO:
|
|
break;
|
|
}
|
|
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(symRef.getSymbol());
|
|
MCELF::SetType(SD, ELF::STT_TLS);
|
|
break;
|
|
}
|
|
|
|
case MCExpr::Unary:
|
|
fixSymbolsInTLSFixups(cast<MCUnaryExpr>(expr)->getSubExpr());
|
|
break;
|
|
}
|
|
}
|
|
|
|
void MCELFStreamer::EmitInstToFragment(const MCInst &Inst) {
|
|
this->MCObjectStreamer::EmitInstToFragment(Inst);
|
|
MCInstFragment &F = *cast<MCInstFragment>(getCurrentFragment());
|
|
|
|
for (unsigned i = 0, e = F.getFixups().size(); i != e; ++i)
|
|
fixSymbolsInTLSFixups(F.getFixups()[i].getValue());
|
|
}
|
|
|
|
void MCELFStreamer::EmitInstToData(const MCInst &Inst) {
|
|
MCDataFragment *DF = getOrCreateDataFragment();
|
|
|
|
SmallVector<MCFixup, 4> Fixups;
|
|
SmallString<256> Code;
|
|
raw_svector_ostream VecOS(Code);
|
|
getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, Fixups);
|
|
VecOS.flush();
|
|
|
|
for (unsigned i = 0, e = Fixups.size(); i != e; ++i)
|
|
fixSymbolsInTLSFixups(Fixups[i].getValue());
|
|
|
|
// Add the fixups and data.
|
|
for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
|
|
Fixups[i].setOffset(Fixups[i].getOffset() + DF->getContents().size());
|
|
DF->addFixup(Fixups[i]);
|
|
}
|
|
DF->getContents().append(Code.begin(), Code.end());
|
|
}
|
|
|
|
void MCELFStreamer::Finish() {
|
|
EmitFrames(true);
|
|
|
|
for (std::vector<LocalCommon>::const_iterator i = LocalCommons.begin(),
|
|
e = LocalCommons.end();
|
|
i != e; ++i) {
|
|
MCSymbolData *SD = i->SD;
|
|
uint64_t Size = i->Size;
|
|
unsigned ByteAlignment = i->ByteAlignment;
|
|
const MCSymbol &Symbol = SD->getSymbol();
|
|
const MCSection &Section = Symbol.getSection();
|
|
|
|
MCSectionData &SectData = getAssembler().getOrCreateSectionData(Section);
|
|
new MCAlignFragment(ByteAlignment, 0, 1, ByteAlignment, &SectData);
|
|
|
|
MCFragment *F = new MCFillFragment(0, 0, Size, &SectData);
|
|
SD->setFragment(F);
|
|
|
|
// Update the maximum alignment of the section if necessary.
|
|
if (ByteAlignment > SectData.getAlignment())
|
|
SectData.setAlignment(ByteAlignment);
|
|
}
|
|
|
|
this->MCObjectStreamer::Finish();
|
|
}
|
|
|
|
MCStreamer *llvm::createELFStreamer(MCContext &Context, MCAsmBackend &MAB,
|
|
raw_ostream &OS, MCCodeEmitter *CE,
|
|
bool RelaxAll, bool NoExecStack) {
|
|
MCELFStreamer *S = new MCELFStreamer(Context, MAB, OS, CE);
|
|
if (RelaxAll)
|
|
S->getAssembler().setRelaxAll(true);
|
|
if (NoExecStack)
|
|
S->getAssembler().setNoExecStack(true);
|
|
return S;
|
|
}
|