mirror of
https://github.com/RPCS3/llvm.git
synced 2024-12-30 16:34:03 +00:00
4186005edc
In assembly the expression a=b is parsed as an assignment, so it should be printed as one. This remove a truly horrible hack for producing a label with "a=.". It would be used by codegen but would never be reached by the asm parser. Sorry I missed this when it was first committed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211639 91177308-0d34-0410-b5e6-96231b3b80d8
588 lines
20 KiB
C++
588 lines
20 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 "llvm/MC/MCELFStreamer.h"
|
|
#include "llvm/ADT/STLExtras.h"
|
|
#include "llvm/ADT/SmallPtrSet.h"
|
|
#include "llvm/MC/MCAsmBackend.h"
|
|
#include "llvm/MC/MCAssembler.h"
|
|
#include "llvm/MC/MCCodeEmitter.h"
|
|
#include "llvm/MC/MCContext.h"
|
|
#include "llvm/MC/MCELF.h"
|
|
#include "llvm/MC/MCELFSymbolFlags.h"
|
|
#include "llvm/MC/MCExpr.h"
|
|
#include "llvm/MC/MCInst.h"
|
|
#include "llvm/MC/MCObjectFileInfo.h"
|
|
#include "llvm/MC/MCObjectStreamer.h"
|
|
#include "llvm/MC/MCSection.h"
|
|
#include "llvm/MC/MCSectionELF.h"
|
|
#include "llvm/MC/MCSymbol.h"
|
|
#include "llvm/MC/MCValue.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;
|
|
|
|
MCELFStreamer::~MCELFStreamer() {
|
|
}
|
|
|
|
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.
|
|
SwitchSection(getContext().getObjectFileInfo()->getTextSection());
|
|
EmitCodeAlignment(4);
|
|
|
|
SwitchSection(getContext().getObjectFileInfo()->getDataSection());
|
|
EmitCodeAlignment(4);
|
|
|
|
SwitchSection(getContext().getObjectFileInfo()->getBSSSection());
|
|
EmitCodeAlignment(4);
|
|
|
|
SwitchSection(getContext().getObjectFileInfo()->getTextSection());
|
|
}
|
|
|
|
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) {
|
|
// Let the target do whatever target specific stuff it needs to do.
|
|
getAssembler().getBackend().handleAssemblerFlag(Flag);
|
|
// Do any generic stuff we need to do.
|
|
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;
|
|
}
|
|
|
|
llvm_unreachable("invalid assembler flag!");
|
|
}
|
|
|
|
void MCELFStreamer::ChangeSection(const MCSection *Section,
|
|
const MCExpr *Subsection) {
|
|
MCSectionData *CurSection = getCurrentSectionData();
|
|
if (CurSection && CurSection->isBundleLocked())
|
|
report_fatal_error("Unterminated .bundle_lock when changing a section");
|
|
const MCSymbol *Grp = static_cast<const MCSectionELF *>(Section)->getGroup();
|
|
if (Grp)
|
|
getAssembler().getOrCreateSymbolData(*Grp);
|
|
this->MCObjectStreamer::ChangeSection(Section, Subsection);
|
|
}
|
|
|
|
void MCELFStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
|
|
getAssembler().getOrCreateSymbolData(*Symbol);
|
|
const MCExpr *Value = MCSymbolRefExpr::Create(
|
|
Symbol, MCSymbolRefExpr::VK_WEAKREF, getContext());
|
|
Alias->setVariableValue(Value);
|
|
}
|
|
|
|
// When GNU as encounters more than one .type declaration for an object it seems
|
|
// to use a mechanism similar to the one below to decide which type is actually
|
|
// used in the object file. The greater of T1 and T2 is selected based on the
|
|
// following ordering:
|
|
// STT_NOTYPE < STT_OBJECT < STT_FUNC < STT_GNU_IFUNC < STT_TLS < anything else
|
|
// If neither T1 < T2 nor T2 < T1 according to this ordering, use T2 (the user
|
|
// provided type).
|
|
static unsigned CombineSymbolTypes(unsigned T1, unsigned T2) {
|
|
unsigned TypeOrdering[] = {ELF::STT_NOTYPE, ELF::STT_OBJECT, ELF::STT_FUNC,
|
|
ELF::STT_GNU_IFUNC, ELF::STT_TLS};
|
|
for (unsigned i = 0; i != array_lengthof(TypeOrdering); ++i) {
|
|
if (T1 == TypeOrdering[i])
|
|
return T2;
|
|
if (T2 == TypeOrdering[i])
|
|
return T1;
|
|
}
|
|
|
|
return T2;
|
|
}
|
|
|
|
bool 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 true;
|
|
}
|
|
|
|
// 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_SymbolResolver:
|
|
case MCSA_PrivateExtern:
|
|
case MCSA_WeakDefinition:
|
|
case MCSA_WeakDefAutoPrivate:
|
|
case MCSA_Invalid:
|
|
case MCSA_IndirectSymbol:
|
|
return false;
|
|
|
|
case MCSA_NoDeadStrip:
|
|
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, CombineSymbolTypes(MCELF::GetType(SD),
|
|
ELF::STT_FUNC));
|
|
break;
|
|
|
|
case MCSA_ELF_TypeIndFunction:
|
|
MCELF::SetType(SD, CombineSymbolTypes(MCELF::GetType(SD),
|
|
ELF::STT_GNU_IFUNC));
|
|
break;
|
|
|
|
case MCSA_ELF_TypeObject:
|
|
MCELF::SetType(SD, CombineSymbolTypes(MCELF::GetType(SD),
|
|
ELF::STT_OBJECT));
|
|
break;
|
|
|
|
case MCSA_ELF_TypeTLS:
|
|
MCELF::SetType(SD, CombineSymbolTypes(MCELF::GetType(SD),
|
|
ELF::STT_TLS));
|
|
break;
|
|
|
|
case MCSA_ELF_TypeCommon:
|
|
// TODO: Emit these as a common symbol.
|
|
MCELF::SetType(SD, CombineSymbolTypes(MCELF::GetType(SD),
|
|
ELF::STT_OBJECT));
|
|
break;
|
|
|
|
case MCSA_ELF_TypeNoType:
|
|
MCELF::SetType(SD, CombineSymbolTypes(MCELF::GetType(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;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
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());
|
|
|
|
AssignSection(Symbol, Section);
|
|
|
|
struct LocalCommon L = {&SD, Size, ByteAlignment};
|
|
LocalCommons.push_back(L);
|
|
} else {
|
|
SD.setCommon(Size, ByteAlignment);
|
|
}
|
|
|
|
SD.setSize(MCConstantExpr::Create(Size, getContext()));
|
|
}
|
|
|
|
void MCELFStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
|
|
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
|
|
SD.setSize(Value);
|
|
}
|
|
|
|
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::EmitValueImpl(const MCExpr *Value, unsigned Size,
|
|
const SMLoc &Loc) {
|
|
if (getCurrentSectionData()->isBundleLocked())
|
|
report_fatal_error("Emitting values inside a locked bundle is forbidden");
|
|
fixSymbolsInTLSFixups(Value);
|
|
MCObjectStreamer::EmitValueImpl(Value, Size, Loc);
|
|
}
|
|
|
|
void MCELFStreamer::EmitValueToAlignment(unsigned ByteAlignment,
|
|
int64_t Value,
|
|
unsigned ValueSize,
|
|
unsigned MaxBytesToEmit) {
|
|
if (getCurrentSectionData()->isBundleLocked())
|
|
report_fatal_error("Emitting values inside a locked bundle is forbidden");
|
|
MCObjectStreamer::EmitValueToAlignment(ByteAlignment, Value,
|
|
ValueSize, MaxBytesToEmit);
|
|
}
|
|
|
|
// Add a symbol for the file name of this module. They start after the
|
|
// null symbol and don't count as normal symbol, i.e. a non-STT_FILE symbol
|
|
// with the same name may appear.
|
|
void MCELFStreamer::EmitFileDirective(StringRef Filename) {
|
|
getAssembler().addFileName(Filename);
|
|
}
|
|
|
|
void MCELFStreamer::EmitIdent(StringRef IdentString) {
|
|
const MCSection *Comment = getAssembler().getContext().getELFSection(
|
|
".comment", ELF::SHT_PROGBITS, ELF::SHF_MERGE | ELF::SHF_STRINGS,
|
|
SectionKind::getReadOnly(), 1, "");
|
|
PushSection();
|
|
SwitchSection(Comment);
|
|
if (!SeenIdent) {
|
|
EmitIntValue(0, 1);
|
|
SeenIdent = true;
|
|
}
|
|
EmitBytes(IdentString);
|
|
EmitIntValue(0, 1);
|
|
PopSection();
|
|
}
|
|
|
|
void MCELFStreamer::fixSymbolsInTLSFixups(const MCExpr *expr) {
|
|
switch (expr->getKind()) {
|
|
case MCExpr::Target:
|
|
cast<MCTargetExpr>(expr)->fixELFSymbolsInTLSFixups(getAssembler());
|
|
break;
|
|
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_Mips_TLSGD:
|
|
case MCSymbolRefExpr::VK_Mips_GOTTPREL:
|
|
case MCSymbolRefExpr::VK_Mips_TPREL_HI:
|
|
case MCSymbolRefExpr::VK_Mips_TPREL_LO:
|
|
case MCSymbolRefExpr::VK_PPC_DTPMOD:
|
|
case MCSymbolRefExpr::VK_PPC_TPREL:
|
|
case MCSymbolRefExpr::VK_PPC_TPREL_LO:
|
|
case MCSymbolRefExpr::VK_PPC_TPREL_HI:
|
|
case MCSymbolRefExpr::VK_PPC_TPREL_HA:
|
|
case MCSymbolRefExpr::VK_PPC_TPREL_HIGHER:
|
|
case MCSymbolRefExpr::VK_PPC_TPREL_HIGHERA:
|
|
case MCSymbolRefExpr::VK_PPC_TPREL_HIGHEST:
|
|
case MCSymbolRefExpr::VK_PPC_TPREL_HIGHESTA:
|
|
case MCSymbolRefExpr::VK_PPC_DTPREL:
|
|
case MCSymbolRefExpr::VK_PPC_DTPREL_LO:
|
|
case MCSymbolRefExpr::VK_PPC_DTPREL_HI:
|
|
case MCSymbolRefExpr::VK_PPC_DTPREL_HA:
|
|
case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHER:
|
|
case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHERA:
|
|
case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHEST:
|
|
case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHESTA:
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TPREL:
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO:
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HI:
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA:
|
|
case MCSymbolRefExpr::VK_PPC_GOT_DTPREL:
|
|
case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_LO:
|
|
case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HI:
|
|
case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HA:
|
|
case MCSymbolRefExpr::VK_PPC_TLS:
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TLSGD:
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO:
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HI:
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA:
|
|
case MCSymbolRefExpr::VK_PPC_TLSGD:
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TLSLD:
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO:
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HI:
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA:
|
|
case MCSymbolRefExpr::VK_PPC_TLSLD:
|
|
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,
|
|
const MCSubtargetInfo &STI) {
|
|
this->MCObjectStreamer::EmitInstToFragment(Inst, STI);
|
|
MCRelaxableFragment &F = *cast<MCRelaxableFragment>(getCurrentFragment());
|
|
|
|
for (unsigned i = 0, e = F.getFixups().size(); i != e; ++i)
|
|
fixSymbolsInTLSFixups(F.getFixups()[i].getValue());
|
|
}
|
|
|
|
void MCELFStreamer::EmitInstToData(const MCInst &Inst,
|
|
const MCSubtargetInfo &STI) {
|
|
MCAssembler &Assembler = getAssembler();
|
|
SmallVector<MCFixup, 4> Fixups;
|
|
SmallString<256> Code;
|
|
raw_svector_ostream VecOS(Code);
|
|
Assembler.getEmitter().EncodeInstruction(Inst, VecOS, Fixups, STI);
|
|
VecOS.flush();
|
|
|
|
for (unsigned i = 0, e = Fixups.size(); i != e; ++i)
|
|
fixSymbolsInTLSFixups(Fixups[i].getValue());
|
|
|
|
// There are several possibilities here:
|
|
//
|
|
// If bundling is disabled, append the encoded instruction to the current data
|
|
// fragment (or create a new such fragment if the current fragment is not a
|
|
// data fragment).
|
|
//
|
|
// If bundling is enabled:
|
|
// - If we're not in a bundle-locked group, emit the instruction into a
|
|
// fragment of its own. If there are no fixups registered for the
|
|
// instruction, emit a MCCompactEncodedInstFragment. Otherwise, emit a
|
|
// MCDataFragment.
|
|
// - If we're in a bundle-locked group, append the instruction to the current
|
|
// data fragment because we want all the instructions in a group to get into
|
|
// the same fragment. Be careful not to do that for the first instruction in
|
|
// the group, though.
|
|
MCDataFragment *DF;
|
|
|
|
if (Assembler.isBundlingEnabled()) {
|
|
MCSectionData *SD = getCurrentSectionData();
|
|
if (SD->isBundleLocked() && !SD->isBundleGroupBeforeFirstInst())
|
|
// If we are bundle-locked, we re-use the current fragment.
|
|
// The bundle-locking directive ensures this is a new data fragment.
|
|
DF = cast<MCDataFragment>(getCurrentFragment());
|
|
else if (!SD->isBundleLocked() && Fixups.size() == 0) {
|
|
// Optimize memory usage by emitting the instruction to a
|
|
// MCCompactEncodedInstFragment when not in a bundle-locked group and
|
|
// there are no fixups registered.
|
|
MCCompactEncodedInstFragment *CEIF = new MCCompactEncodedInstFragment();
|
|
insert(CEIF);
|
|
CEIF->getContents().append(Code.begin(), Code.end());
|
|
return;
|
|
} else {
|
|
DF = new MCDataFragment();
|
|
insert(DF);
|
|
if (SD->getBundleLockState() == MCSectionData::BundleLockedAlignToEnd) {
|
|
// If this is a new fragment created for a bundle-locked group, and the
|
|
// group was marked as "align_to_end", set a flag in the fragment.
|
|
DF->setAlignToBundleEnd(true);
|
|
}
|
|
}
|
|
|
|
// We're now emitting an instruction in a bundle group, so this flag has
|
|
// to be turned off.
|
|
SD->setBundleGroupBeforeFirstInst(false);
|
|
} else {
|
|
DF = getOrCreateDataFragment();
|
|
}
|
|
|
|
// 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->getFixups().push_back(Fixups[i]);
|
|
}
|
|
DF->setHasInstructions(true);
|
|
DF->getContents().append(Code.begin(), Code.end());
|
|
}
|
|
|
|
void MCELFStreamer::EmitBundleAlignMode(unsigned AlignPow2) {
|
|
assert(AlignPow2 <= 30 && "Invalid bundle alignment");
|
|
MCAssembler &Assembler = getAssembler();
|
|
if (Assembler.getBundleAlignSize() == 0 && AlignPow2 > 0)
|
|
Assembler.setBundleAlignSize(1 << AlignPow2);
|
|
else
|
|
report_fatal_error(".bundle_align_mode should be only set once per file");
|
|
}
|
|
|
|
void MCELFStreamer::EmitBundleLock(bool AlignToEnd) {
|
|
MCSectionData *SD = getCurrentSectionData();
|
|
|
|
// Sanity checks
|
|
//
|
|
if (!getAssembler().isBundlingEnabled())
|
|
report_fatal_error(".bundle_lock forbidden when bundling is disabled");
|
|
else if (SD->isBundleLocked())
|
|
report_fatal_error("Nesting of .bundle_lock is forbidden");
|
|
|
|
SD->setBundleLockState(AlignToEnd ? MCSectionData::BundleLockedAlignToEnd :
|
|
MCSectionData::BundleLocked);
|
|
SD->setBundleGroupBeforeFirstInst(true);
|
|
}
|
|
|
|
void MCELFStreamer::EmitBundleUnlock() {
|
|
MCSectionData *SD = getCurrentSectionData();
|
|
|
|
// Sanity checks
|
|
if (!getAssembler().isBundlingEnabled())
|
|
report_fatal_error(".bundle_unlock forbidden when bundling is disabled");
|
|
else if (!SD->isBundleLocked())
|
|
report_fatal_error(".bundle_unlock without matching lock");
|
|
else if (SD->isBundleGroupBeforeFirstInst())
|
|
report_fatal_error("Empty bundle-locked group is forbidden");
|
|
|
|
SD->setBundleLockState(MCSectionData::NotBundleLocked);
|
|
}
|
|
|
|
void MCELFStreamer::Flush() {
|
|
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);
|
|
}
|
|
|
|
LocalCommons.clear();
|
|
}
|
|
|
|
void MCELFStreamer::FinishImpl() {
|
|
EmitFrames(nullptr);
|
|
|
|
Flush();
|
|
|
|
this->MCObjectStreamer::FinishImpl();
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
void MCELFStreamer::EmitThumbFunc(MCSymbol *Func) {
|
|
llvm_unreachable("Generic ELF doesn't support this directive");
|
|
}
|
|
|
|
void MCELFStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
|
|
llvm_unreachable("ELF doesn't support this directive");
|
|
}
|
|
|
|
void MCELFStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
|
|
llvm_unreachable("ELF doesn't support this directive");
|
|
}
|
|
|
|
void MCELFStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {
|
|
llvm_unreachable("ELF doesn't support this directive");
|
|
}
|
|
|
|
void MCELFStreamer::EmitCOFFSymbolType(int Type) {
|
|
llvm_unreachable("ELF doesn't support this directive");
|
|
}
|
|
|
|
void MCELFStreamer::EndCOFFSymbolDef() {
|
|
llvm_unreachable("ELF doesn't support this directive");
|
|
}
|
|
|
|
void MCELFStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
|
|
uint64_t Size, unsigned ByteAlignment) {
|
|
llvm_unreachable("ELF doesn't support this directive");
|
|
}
|
|
|
|
void MCELFStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
|
|
uint64_t Size, unsigned ByteAlignment) {
|
|
llvm_unreachable("ELF doesn't support this directive");
|
|
}
|