mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-13 20:32:21 +00:00
e7b068f9f1
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206631 91177308-0d34-0410-b5e6-96231b3b80d8
467 lines
17 KiB
C++
467 lines
17 KiB
C++
//===-- MCMachOStreamer.cpp - MachO Streamer ------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/MC/MCStreamer.h"
|
|
#include "llvm/ADT/DenseMap.h"
|
|
#include "llvm/ADT/SmallVector.h"
|
|
#include "llvm/MC/MCAsmBackend.h"
|
|
#include "llvm/MC/MCAssembler.h"
|
|
#include "llvm/MC/MCCodeEmitter.h"
|
|
#include "llvm/MC/MCContext.h"
|
|
#include "llvm/MC/MCDwarf.h"
|
|
#include "llvm/MC/MCExpr.h"
|
|
#include "llvm/MC/MCInst.h"
|
|
#include "llvm/MC/MCLinkerOptimizationHint.h"
|
|
#include "llvm/MC/MCMachOSymbolFlags.h"
|
|
#include "llvm/MC/MCObjectFileInfo.h"
|
|
#include "llvm/MC/MCObjectStreamer.h"
|
|
#include "llvm/MC/MCSection.h"
|
|
#include "llvm/MC/MCSectionMachO.h"
|
|
#include "llvm/MC/MCSymbol.h"
|
|
#include "llvm/Support/Dwarf.h"
|
|
#include "llvm/Support/ErrorHandling.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
|
|
class MCMachOStreamer : public MCObjectStreamer {
|
|
private:
|
|
/// LabelSections - true if each section change should emit a linker local
|
|
/// label for use in relocations for assembler local references. Obviates the
|
|
/// need for local relocations. False by default.
|
|
bool LabelSections;
|
|
|
|
/// HasSectionLabel - map of which sections have already had a non-local
|
|
/// label emitted to them. Used so we don't emit extraneous linker local
|
|
/// labels in the middle of the section.
|
|
DenseMap<const MCSection*, bool> HasSectionLabel;
|
|
|
|
void EmitInstToData(const MCInst &Inst, const MCSubtargetInfo &STI) override;
|
|
|
|
void EmitDataRegion(DataRegionData::KindTy Kind);
|
|
void EmitDataRegionEnd();
|
|
|
|
public:
|
|
MCMachOStreamer(MCContext &Context, MCAsmBackend &MAB, raw_ostream &OS,
|
|
MCCodeEmitter *Emitter, bool label)
|
|
: MCObjectStreamer(Context, MAB, OS, Emitter),
|
|
LabelSections(label) {}
|
|
|
|
/// @name MCStreamer Interface
|
|
/// @{
|
|
|
|
void ChangeSection(const MCSection *Sect, const MCExpr *Subsect) override;
|
|
void EmitLabel(MCSymbol *Symbol) override;
|
|
void EmitDebugLabel(MCSymbol *Symbol) override;
|
|
void EmitEHSymAttributes(const MCSymbol *Symbol, MCSymbol *EHSymbol) override;
|
|
void EmitAssemblerFlag(MCAssemblerFlag Flag) override;
|
|
void EmitLinkerOptions(ArrayRef<std::string> Options) override;
|
|
void EmitDataRegion(MCDataRegionType Kind) override;
|
|
void EmitVersionMin(MCVersionMinType Kind, unsigned Major,
|
|
unsigned Minor, unsigned Update) override;
|
|
void EmitThumbFunc(MCSymbol *Func) override;
|
|
bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override;
|
|
void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override;
|
|
void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
|
|
unsigned ByteAlignment) override;
|
|
void BeginCOFFSymbolDef(const MCSymbol *Symbol) override {
|
|
llvm_unreachable("macho doesn't support this directive");
|
|
}
|
|
void EmitCOFFSymbolStorageClass(int StorageClass) override {
|
|
llvm_unreachable("macho doesn't support this directive");
|
|
}
|
|
void EmitCOFFSymbolType(int Type) override {
|
|
llvm_unreachable("macho doesn't support this directive");
|
|
}
|
|
void EndCOFFSymbolDef() override {
|
|
llvm_unreachable("macho doesn't support this directive");
|
|
}
|
|
void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) override {
|
|
llvm_unreachable("macho doesn't support this directive");
|
|
}
|
|
void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
|
|
unsigned ByteAlignment) override;
|
|
void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = nullptr,
|
|
uint64_t Size = 0, unsigned ByteAlignment = 0) override;
|
|
virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
|
|
uint64_t Size, unsigned ByteAlignment = 0) override;
|
|
|
|
void EmitFileDirective(StringRef Filename) override {
|
|
// FIXME: Just ignore the .file; it isn't important enough to fail the
|
|
// entire assembly.
|
|
|
|
// report_fatal_error("unsupported directive: '.file'");
|
|
}
|
|
|
|
void EmitIdent(StringRef IdentString) override {
|
|
llvm_unreachable("macho doesn't support this directive");
|
|
}
|
|
|
|
void EmitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) override {
|
|
getAssembler().getLOHContainer().addDirective(Kind, Args);
|
|
}
|
|
|
|
void FinishImpl() override;
|
|
};
|
|
|
|
} // end anonymous namespace.
|
|
|
|
void MCMachOStreamer::ChangeSection(const MCSection *Section,
|
|
const MCExpr *Subsection) {
|
|
// Change the section normally.
|
|
MCObjectStreamer::ChangeSection(Section, Subsection);
|
|
// Output a linker-local symbol so we don't need section-relative local
|
|
// relocations. The linker hates us when we do that.
|
|
if (LabelSections && !HasSectionLabel[Section]) {
|
|
MCSymbol *Label = getContext().CreateLinkerPrivateTempSymbol();
|
|
EmitLabel(Label);
|
|
HasSectionLabel[Section] = true;
|
|
}
|
|
}
|
|
|
|
void MCMachOStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
|
|
MCSymbol *EHSymbol) {
|
|
MCSymbolData &SD =
|
|
getAssembler().getOrCreateSymbolData(*Symbol);
|
|
if (SD.isExternal())
|
|
EmitSymbolAttribute(EHSymbol, MCSA_Global);
|
|
if (SD.getFlags() & SF_WeakDefinition)
|
|
EmitSymbolAttribute(EHSymbol, MCSA_WeakDefinition);
|
|
if (SD.isPrivateExtern())
|
|
EmitSymbolAttribute(EHSymbol, MCSA_PrivateExtern);
|
|
}
|
|
|
|
void MCMachOStreamer::EmitLabel(MCSymbol *Symbol) {
|
|
assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
|
|
|
|
// isSymbolLinkerVisible uses the section.
|
|
AssignSection(Symbol, getCurrentSection().first);
|
|
// We have to create a new fragment if this is an atom defining symbol,
|
|
// fragments cannot span atoms.
|
|
if (getAssembler().isSymbolLinkerVisible(*Symbol))
|
|
insert(new MCDataFragment());
|
|
|
|
MCObjectStreamer::EmitLabel(Symbol);
|
|
|
|
MCSymbolData &SD = getAssembler().getSymbolData(*Symbol);
|
|
// This causes the reference type flag to be cleared. Darwin 'as' was "trying"
|
|
// to clear the weak reference and weak definition bits too, but the
|
|
// implementation was buggy. For now we just try to match 'as', for
|
|
// diffability.
|
|
//
|
|
// FIXME: Cleanup this code, these bits should be emitted based on semantic
|
|
// properties, not on the order of definition, etc.
|
|
SD.setFlags(SD.getFlags() & ~SF_ReferenceTypeMask);
|
|
}
|
|
|
|
void MCMachOStreamer::EmitDebugLabel(MCSymbol *Symbol) {
|
|
EmitLabel(Symbol);
|
|
}
|
|
void MCMachOStreamer::EmitDataRegion(DataRegionData::KindTy Kind) {
|
|
if (!getAssembler().getBackend().hasDataInCodeSupport())
|
|
return;
|
|
// Create a temporary label to mark the start of the data region.
|
|
MCSymbol *Start = getContext().CreateTempSymbol();
|
|
EmitLabel(Start);
|
|
// Record the region for the object writer to use.
|
|
DataRegionData Data = { Kind, Start, nullptr };
|
|
std::vector<DataRegionData> &Regions = getAssembler().getDataRegions();
|
|
Regions.push_back(Data);
|
|
}
|
|
|
|
void MCMachOStreamer::EmitDataRegionEnd() {
|
|
if (!getAssembler().getBackend().hasDataInCodeSupport())
|
|
return;
|
|
std::vector<DataRegionData> &Regions = getAssembler().getDataRegions();
|
|
assert(Regions.size() && "Mismatched .end_data_region!");
|
|
DataRegionData &Data = Regions.back();
|
|
assert(!Data.End && "Mismatched .end_data_region!");
|
|
// Create a temporary label to mark the end of the data region.
|
|
Data.End = getContext().CreateTempSymbol();
|
|
EmitLabel(Data.End);
|
|
}
|
|
|
|
void MCMachOStreamer::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;
|
|
}
|
|
}
|
|
|
|
void MCMachOStreamer::EmitLinkerOptions(ArrayRef<std::string> Options) {
|
|
getAssembler().getLinkerOptions().push_back(Options);
|
|
}
|
|
|
|
void MCMachOStreamer::EmitDataRegion(MCDataRegionType Kind) {
|
|
switch (Kind) {
|
|
case MCDR_DataRegion:
|
|
EmitDataRegion(DataRegionData::Data);
|
|
return;
|
|
case MCDR_DataRegionJT8:
|
|
EmitDataRegion(DataRegionData::JumpTable8);
|
|
return;
|
|
case MCDR_DataRegionJT16:
|
|
EmitDataRegion(DataRegionData::JumpTable16);
|
|
return;
|
|
case MCDR_DataRegionJT32:
|
|
EmitDataRegion(DataRegionData::JumpTable32);
|
|
return;
|
|
case MCDR_DataRegionEnd:
|
|
EmitDataRegionEnd();
|
|
return;
|
|
}
|
|
}
|
|
|
|
void MCMachOStreamer::EmitVersionMin(MCVersionMinType Kind, unsigned Major,
|
|
unsigned Minor, unsigned Update) {
|
|
getAssembler().setVersionMinInfo(Kind, Major, Minor, Update);
|
|
}
|
|
|
|
void MCMachOStreamer::EmitThumbFunc(MCSymbol *Symbol) {
|
|
// Remember that the function is a thumb function. Fixup and relocation
|
|
// values will need adjusted.
|
|
getAssembler().setIsThumbFunc(Symbol);
|
|
|
|
// Mark the thumb bit on the symbol.
|
|
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
|
|
SD.setFlags(SD.getFlags() | SF_ThumbFunc);
|
|
}
|
|
|
|
bool MCMachOStreamer::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_Invalid:
|
|
case MCSA_ELF_TypeFunction:
|
|
case MCSA_ELF_TypeIndFunction:
|
|
case MCSA_ELF_TypeObject:
|
|
case MCSA_ELF_TypeTLS:
|
|
case MCSA_ELF_TypeCommon:
|
|
case MCSA_ELF_TypeNoType:
|
|
case MCSA_ELF_TypeGnuUniqueObject:
|
|
case MCSA_Hidden:
|
|
case MCSA_IndirectSymbol:
|
|
case MCSA_Internal:
|
|
case MCSA_Protected:
|
|
case MCSA_Weak:
|
|
case MCSA_Local:
|
|
return false;
|
|
|
|
case MCSA_Global:
|
|
SD.setExternal(true);
|
|
// This effectively clears the undefined lazy bit, in Darwin 'as', although
|
|
// it isn't very consistent because it implements this as part of symbol
|
|
// lookup.
|
|
//
|
|
// FIXME: Cleanup this code, these bits should be emitted based on semantic
|
|
// properties, not on the order of definition, etc.
|
|
SD.setFlags(SD.getFlags() & ~SF_ReferenceTypeUndefinedLazy);
|
|
break;
|
|
|
|
case MCSA_LazyReference:
|
|
// FIXME: This requires -dynamic.
|
|
SD.setFlags(SD.getFlags() | SF_NoDeadStrip);
|
|
if (Symbol->isUndefined())
|
|
SD.setFlags(SD.getFlags() | SF_ReferenceTypeUndefinedLazy);
|
|
break;
|
|
|
|
// Since .reference sets the no dead strip bit, it is equivalent to
|
|
// .no_dead_strip in practice.
|
|
case MCSA_Reference:
|
|
case MCSA_NoDeadStrip:
|
|
SD.setFlags(SD.getFlags() | SF_NoDeadStrip);
|
|
break;
|
|
|
|
case MCSA_SymbolResolver:
|
|
SD.setFlags(SD.getFlags() | SF_SymbolResolver);
|
|
break;
|
|
|
|
case MCSA_PrivateExtern:
|
|
SD.setExternal(true);
|
|
SD.setPrivateExtern(true);
|
|
break;
|
|
|
|
case MCSA_WeakReference:
|
|
// FIXME: This requires -dynamic.
|
|
if (Symbol->isUndefined())
|
|
SD.setFlags(SD.getFlags() | SF_WeakReference);
|
|
break;
|
|
|
|
case MCSA_WeakDefinition:
|
|
// FIXME: 'as' enforces that this is defined and global. The manual claims
|
|
// it has to be in a coalesced section, but this isn't enforced.
|
|
SD.setFlags(SD.getFlags() | SF_WeakDefinition);
|
|
break;
|
|
|
|
case MCSA_WeakDefAutoPrivate:
|
|
SD.setFlags(SD.getFlags() | SF_WeakDefinition | SF_WeakReference);
|
|
break;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void MCMachOStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
|
|
// Encode the 'desc' value into the lowest implementation defined bits.
|
|
assert(DescValue == (DescValue & SF_DescFlagsMask) &&
|
|
"Invalid .desc value!");
|
|
getAssembler().getOrCreateSymbolData(*Symbol).setFlags(
|
|
DescValue & SF_DescFlagsMask);
|
|
}
|
|
|
|
void MCMachOStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
|
|
unsigned ByteAlignment) {
|
|
// FIXME: Darwin 'as' does appear to allow redef of a .comm by itself.
|
|
assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
|
|
|
|
AssignSection(Symbol, nullptr);
|
|
|
|
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
|
|
SD.setExternal(true);
|
|
SD.setCommon(Size, ByteAlignment);
|
|
}
|
|
|
|
void MCMachOStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
|
|
unsigned ByteAlignment) {
|
|
// '.lcomm' is equivalent to '.zerofill'.
|
|
return EmitZerofill(getContext().getObjectFileInfo()->getDataBSSSection(),
|
|
Symbol, Size, ByteAlignment);
|
|
}
|
|
|
|
void MCMachOStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
|
|
uint64_t Size, unsigned ByteAlignment) {
|
|
MCSectionData &SectData = getAssembler().getOrCreateSectionData(*Section);
|
|
|
|
// The symbol may not be present, which only creates the section.
|
|
if (!Symbol)
|
|
return;
|
|
|
|
// On darwin all virtual sections have zerofill type.
|
|
assert(Section->isVirtualSection() && "Section does not have zerofill type!");
|
|
|
|
assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
|
|
|
|
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
|
|
|
|
// Emit an align fragment if necessary.
|
|
if (ByteAlignment != 1)
|
|
new MCAlignFragment(ByteAlignment, 0, 0, ByteAlignment, &SectData);
|
|
|
|
MCFragment *F = new MCFillFragment(0, 0, Size, &SectData);
|
|
SD.setFragment(F);
|
|
|
|
AssignSection(Symbol, Section);
|
|
|
|
// Update the maximum alignment on the zero fill section if necessary.
|
|
if (ByteAlignment > SectData.getAlignment())
|
|
SectData.setAlignment(ByteAlignment);
|
|
}
|
|
|
|
// This should always be called with the thread local bss section. Like the
|
|
// .zerofill directive this doesn't actually switch sections on us.
|
|
void MCMachOStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
|
|
uint64_t Size, unsigned ByteAlignment) {
|
|
EmitZerofill(Section, Symbol, Size, ByteAlignment);
|
|
return;
|
|
}
|
|
|
|
void MCMachOStreamer::EmitInstToData(const MCInst &Inst,
|
|
const MCSubtargetInfo &STI) {
|
|
MCDataFragment *DF = getOrCreateDataFragment();
|
|
|
|
SmallVector<MCFixup, 4> Fixups;
|
|
SmallString<256> Code;
|
|
raw_svector_ostream VecOS(Code);
|
|
getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, Fixups, STI);
|
|
VecOS.flush();
|
|
|
|
// 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->getContents().append(Code.begin(), Code.end());
|
|
}
|
|
|
|
void MCMachOStreamer::FinishImpl() {
|
|
EmitFrames(&getAssembler().getBackend(), true);
|
|
|
|
// We have to set the fragment atom associations so we can relax properly for
|
|
// Mach-O.
|
|
|
|
// First, scan the symbol table to build a lookup table from fragments to
|
|
// defining symbols.
|
|
DenseMap<const MCFragment*, MCSymbolData*> DefiningSymbolMap;
|
|
for (MCSymbolData &SD : getAssembler().symbols()) {
|
|
if (getAssembler().isSymbolLinkerVisible(SD.getSymbol()) &&
|
|
SD.getFragment()) {
|
|
// An atom defining symbol should never be internal to a fragment.
|
|
assert(SD.getOffset() == 0 && "Invalid offset in atom defining symbol!");
|
|
DefiningSymbolMap[SD.getFragment()] = &SD;
|
|
}
|
|
}
|
|
|
|
// Set the fragment atom associations by tracking the last seen atom defining
|
|
// symbol.
|
|
for (MCAssembler::iterator it = getAssembler().begin(),
|
|
ie = getAssembler().end(); it != ie; ++it) {
|
|
MCSymbolData *CurrentAtom = nullptr;
|
|
for (MCSectionData::iterator it2 = it->begin(),
|
|
ie2 = it->end(); it2 != ie2; ++it2) {
|
|
if (MCSymbolData *SD = DefiningSymbolMap.lookup(it2))
|
|
CurrentAtom = SD;
|
|
it2->setAtom(CurrentAtom);
|
|
}
|
|
}
|
|
|
|
this->MCObjectStreamer::FinishImpl();
|
|
}
|
|
|
|
MCStreamer *llvm::createMachOStreamer(MCContext &Context, MCAsmBackend &MAB,
|
|
raw_ostream &OS, MCCodeEmitter *CE,
|
|
bool RelaxAll,
|
|
bool LabelSections) {
|
|
MCMachOStreamer *S = new MCMachOStreamer(Context, MAB, OS, CE, LabelSections);
|
|
if (RelaxAll)
|
|
S->getAssembler().setRelaxAll(true);
|
|
return S;
|
|
}
|