mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-05 13:09:10 +00:00
712c27f870
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238150 91177308-0d34-0410-b5e6-96231b3b80d8
462 lines
16 KiB
C++
462 lines
16 KiB
C++
//===- lib/MC/MCObjectStreamer.cpp - Object File MCStreamer Interface -----===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/MC/MCObjectStreamer.h"
|
|
#include "llvm/ADT/STLExtras.h"
|
|
#include "llvm/MC/MCAsmBackend.h"
|
|
#include "llvm/MC/MCAsmInfo.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/MCObjectWriter.h"
|
|
#include "llvm/MC/MCSection.h"
|
|
#include "llvm/MC/MCSymbol.h"
|
|
#include "llvm/Support/ErrorHandling.h"
|
|
#include "llvm/Support/TargetRegistry.h"
|
|
using namespace llvm;
|
|
|
|
MCObjectStreamer::MCObjectStreamer(MCContext &Context, MCAsmBackend &TAB,
|
|
raw_pwrite_stream &OS,
|
|
MCCodeEmitter *Emitter_)
|
|
: MCStreamer(Context),
|
|
Assembler(new MCAssembler(Context, TAB, *Emitter_,
|
|
*TAB.createObjectWriter(OS), OS)),
|
|
CurSectionData(nullptr), EmitEHFrame(true), EmitDebugFrame(false) {}
|
|
|
|
MCObjectStreamer::~MCObjectStreamer() {
|
|
delete &Assembler->getBackend();
|
|
delete &Assembler->getEmitter();
|
|
delete &Assembler->getWriter();
|
|
delete Assembler;
|
|
}
|
|
|
|
void MCObjectStreamer::flushPendingLabels(MCFragment *F, uint64_t FOffset) {
|
|
if (PendingLabels.size()) {
|
|
if (!F) {
|
|
F = new MCDataFragment();
|
|
CurSectionData->getFragmentList().insert(CurInsertionPoint, F);
|
|
F->setParent(CurSectionData);
|
|
}
|
|
for (MCSymbolData *SD : PendingLabels) {
|
|
SD->setFragment(F);
|
|
SD->setOffset(FOffset);
|
|
}
|
|
PendingLabels.clear();
|
|
}
|
|
}
|
|
|
|
bool MCObjectStreamer::emitAbsoluteSymbolDiff(const MCSymbol *Hi,
|
|
const MCSymbol *Lo,
|
|
unsigned Size) {
|
|
// Must have symbol data.
|
|
if (!Assembler->hasSymbolData(*Hi) || !Assembler->hasSymbolData(*Lo))
|
|
return false;
|
|
auto &HiD = Assembler->getSymbolData(*Hi);
|
|
auto &LoD = Assembler->getSymbolData(*Lo);
|
|
|
|
// Must both be assigned to the same (valid) fragment.
|
|
if (!HiD.getFragment() || HiD.getFragment() != LoD.getFragment())
|
|
return false;
|
|
|
|
// Must be a data fragment.
|
|
if (!isa<MCDataFragment>(HiD.getFragment()))
|
|
return false;
|
|
|
|
assert(HiD.getOffset() >= LoD.getOffset() &&
|
|
"Expected Hi to be greater than Lo");
|
|
EmitIntValue(HiD.getOffset() - LoD.getOffset(), Size);
|
|
return true;
|
|
}
|
|
|
|
void MCObjectStreamer::reset() {
|
|
if (Assembler)
|
|
Assembler->reset();
|
|
CurSectionData = nullptr;
|
|
CurInsertionPoint = MCSectionData::iterator();
|
|
EmitEHFrame = true;
|
|
EmitDebugFrame = false;
|
|
PendingLabels.clear();
|
|
MCStreamer::reset();
|
|
}
|
|
|
|
void MCObjectStreamer::EmitFrames(MCAsmBackend *MAB) {
|
|
if (!getNumFrameInfos())
|
|
return;
|
|
|
|
if (EmitEHFrame)
|
|
MCDwarfFrameEmitter::Emit(*this, MAB, true);
|
|
|
|
if (EmitDebugFrame)
|
|
MCDwarfFrameEmitter::Emit(*this, MAB, false);
|
|
}
|
|
|
|
MCFragment *MCObjectStreamer::getCurrentFragment() const {
|
|
assert(getCurrentSectionData() && "No current section!");
|
|
|
|
if (CurInsertionPoint != getCurrentSectionData()->getFragmentList().begin())
|
|
return std::prev(CurInsertionPoint);
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
MCDataFragment *MCObjectStreamer::getOrCreateDataFragment() {
|
|
MCDataFragment *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
|
|
// When bundling is enabled, we don't want to add data to a fragment that
|
|
// already has instructions (see MCELFStreamer::EmitInstToData for details)
|
|
if (!F || (Assembler->isBundlingEnabled() && !Assembler->getRelaxAll() &&
|
|
F->hasInstructions())) {
|
|
F = new MCDataFragment();
|
|
insert(F);
|
|
}
|
|
return F;
|
|
}
|
|
|
|
void MCObjectStreamer::visitUsedSymbol(const MCSymbol &Sym) {
|
|
Assembler->getOrCreateSymbolData(Sym);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitCFISections(bool EH, bool Debug) {
|
|
MCStreamer::EmitCFISections(EH, Debug);
|
|
EmitEHFrame = EH;
|
|
EmitDebugFrame = Debug;
|
|
}
|
|
|
|
void MCObjectStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
|
|
const SMLoc &Loc) {
|
|
MCStreamer::EmitValueImpl(Value, Size, Loc);
|
|
MCDataFragment *DF = getOrCreateDataFragment();
|
|
|
|
MCLineEntry::Make(this, getCurrentSection().first);
|
|
|
|
// Avoid fixups when possible.
|
|
int64_t AbsValue;
|
|
if (Value->EvaluateAsAbsolute(AbsValue, getAssembler())) {
|
|
EmitIntValue(AbsValue, Size);
|
|
return;
|
|
}
|
|
DF->getFixups().push_back(
|
|
MCFixup::create(DF->getContents().size(), Value,
|
|
MCFixup::getKindForSize(Size, false), Loc));
|
|
DF->getContents().resize(DF->getContents().size() + Size, 0);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
|
|
// We need to create a local symbol to avoid relocations.
|
|
Frame.Begin = getContext().createTempSymbol();
|
|
EmitLabel(Frame.Begin);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
|
|
Frame.End = getContext().createTempSymbol();
|
|
EmitLabel(Frame.End);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitLabel(MCSymbol *Symbol) {
|
|
MCStreamer::EmitLabel(Symbol);
|
|
|
|
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
|
|
assert(!SD.getFragment() && "Unexpected fragment on symbol data!");
|
|
|
|
// If there is a current fragment, mark the symbol as pointing into it.
|
|
// Otherwise queue the label and set its fragment pointer when we emit the
|
|
// next fragment.
|
|
auto *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
|
|
if (F && !(getAssembler().isBundlingEnabled() &&
|
|
getAssembler().getRelaxAll())) {
|
|
SD.setFragment(F);
|
|
SD.setOffset(F->getContents().size());
|
|
} else {
|
|
PendingLabels.push_back(&SD);
|
|
}
|
|
}
|
|
|
|
void MCObjectStreamer::EmitULEB128Value(const MCExpr *Value) {
|
|
int64_t IntValue;
|
|
if (Value->EvaluateAsAbsolute(IntValue, getAssembler())) {
|
|
EmitULEB128IntValue(IntValue);
|
|
return;
|
|
}
|
|
insert(new MCLEBFragment(*Value, false));
|
|
}
|
|
|
|
void MCObjectStreamer::EmitSLEB128Value(const MCExpr *Value) {
|
|
int64_t IntValue;
|
|
if (Value->EvaluateAsAbsolute(IntValue, getAssembler())) {
|
|
EmitSLEB128IntValue(IntValue);
|
|
return;
|
|
}
|
|
insert(new MCLEBFragment(*Value, true));
|
|
}
|
|
|
|
void MCObjectStreamer::EmitWeakReference(MCSymbol *Alias,
|
|
const MCSymbol *Symbol) {
|
|
report_fatal_error("This file format doesn't support weak aliases.");
|
|
}
|
|
|
|
void MCObjectStreamer::ChangeSection(MCSection *Section,
|
|
const MCExpr *Subsection) {
|
|
changeSectionImpl(Section, Subsection);
|
|
}
|
|
|
|
bool MCObjectStreamer::changeSectionImpl(MCSection *Section,
|
|
const MCExpr *Subsection) {
|
|
assert(Section && "Cannot switch to a null section!");
|
|
flushPendingLabels(nullptr);
|
|
|
|
bool Created;
|
|
CurSectionData = &getAssembler().getOrCreateSectionData(*Section, &Created);
|
|
|
|
int64_t IntSubsection = 0;
|
|
if (Subsection &&
|
|
!Subsection->EvaluateAsAbsolute(IntSubsection, getAssembler()))
|
|
report_fatal_error("Cannot evaluate subsection number");
|
|
if (IntSubsection < 0 || IntSubsection > 8192)
|
|
report_fatal_error("Subsection number out of range");
|
|
CurInsertionPoint =
|
|
CurSectionData->getSubsectionInsertionPoint(unsigned(IntSubsection));
|
|
return Created;
|
|
}
|
|
|
|
void MCObjectStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
|
|
getAssembler().getOrCreateSymbolData(*Symbol);
|
|
MCStreamer::EmitAssignment(Symbol, Value);
|
|
}
|
|
|
|
bool MCObjectStreamer::mayHaveInstructions(MCSection &Sec) const {
|
|
return Sec.hasInstructions();
|
|
}
|
|
|
|
void MCObjectStreamer::EmitInstruction(const MCInst &Inst,
|
|
const MCSubtargetInfo &STI) {
|
|
MCStreamer::EmitInstruction(Inst, STI);
|
|
|
|
MCSectionData *SD = getCurrentSectionData();
|
|
SD->getSection().setHasInstructions(true);
|
|
|
|
// Now that a machine instruction has been assembled into this section, make
|
|
// a line entry for any .loc directive that has been seen.
|
|
MCLineEntry::Make(this, getCurrentSection().first);
|
|
|
|
// If this instruction doesn't need relaxation, just emit it as data.
|
|
MCAssembler &Assembler = getAssembler();
|
|
if (!Assembler.getBackend().mayNeedRelaxation(Inst)) {
|
|
EmitInstToData(Inst, STI);
|
|
return;
|
|
}
|
|
|
|
// Otherwise, relax and emit it as data if either:
|
|
// - The RelaxAll flag was passed
|
|
// - Bundling is enabled and this instruction is inside a bundle-locked
|
|
// group. We want to emit all such instructions into the same data
|
|
// fragment.
|
|
if (Assembler.getRelaxAll() ||
|
|
(Assembler.isBundlingEnabled() && SD->getSection().isBundleLocked())) {
|
|
MCInst Relaxed;
|
|
getAssembler().getBackend().relaxInstruction(Inst, Relaxed);
|
|
while (getAssembler().getBackend().mayNeedRelaxation(Relaxed))
|
|
getAssembler().getBackend().relaxInstruction(Relaxed, Relaxed);
|
|
EmitInstToData(Relaxed, STI);
|
|
return;
|
|
}
|
|
|
|
// Otherwise emit to a separate fragment.
|
|
EmitInstToFragment(Inst, STI);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitInstToFragment(const MCInst &Inst,
|
|
const MCSubtargetInfo &STI) {
|
|
if (getAssembler().getRelaxAll() && getAssembler().isBundlingEnabled())
|
|
llvm_unreachable("All instructions should have already been relaxed");
|
|
|
|
// Always create a new, separate fragment here, because its size can change
|
|
// during relaxation.
|
|
MCRelaxableFragment *IF = new MCRelaxableFragment(Inst, STI);
|
|
insert(IF);
|
|
|
|
SmallString<128> Code;
|
|
raw_svector_ostream VecOS(Code);
|
|
getAssembler().getEmitter().encodeInstruction(Inst, VecOS, IF->getFixups(),
|
|
STI);
|
|
VecOS.flush();
|
|
IF->getContents().append(Code.begin(), Code.end());
|
|
}
|
|
|
|
#ifndef NDEBUG
|
|
static const char *const BundlingNotImplementedMsg =
|
|
"Aligned bundling is not implemented for this object format";
|
|
#endif
|
|
|
|
void MCObjectStreamer::EmitBundleAlignMode(unsigned AlignPow2) {
|
|
llvm_unreachable(BundlingNotImplementedMsg);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitBundleLock(bool AlignToEnd) {
|
|
llvm_unreachable(BundlingNotImplementedMsg);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitBundleUnlock() {
|
|
llvm_unreachable(BundlingNotImplementedMsg);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
|
|
unsigned Column, unsigned Flags,
|
|
unsigned Isa,
|
|
unsigned Discriminator,
|
|
StringRef FileName) {
|
|
// In case we see two .loc directives in a row, make sure the
|
|
// first one gets a line entry.
|
|
MCLineEntry::Make(this, getCurrentSection().first);
|
|
|
|
this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
|
|
Isa, Discriminator, FileName);
|
|
}
|
|
|
|
static const MCExpr *buildSymbolDiff(MCObjectStreamer &OS, const MCSymbol *A,
|
|
const MCSymbol *B) {
|
|
MCContext &Context = OS.getContext();
|
|
MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
|
|
const MCExpr *ARef = MCSymbolRefExpr::Create(A, Variant, Context);
|
|
const MCExpr *BRef = MCSymbolRefExpr::Create(B, Variant, Context);
|
|
const MCExpr *AddrDelta =
|
|
MCBinaryExpr::Create(MCBinaryExpr::Sub, ARef, BRef, Context);
|
|
return AddrDelta;
|
|
}
|
|
|
|
static void emitDwarfSetLineAddr(MCObjectStreamer &OS, int64_t LineDelta,
|
|
const MCSymbol *Label, int PointerSize) {
|
|
// emit the sequence to set the address
|
|
OS.EmitIntValue(dwarf::DW_LNS_extended_op, 1);
|
|
OS.EmitULEB128IntValue(PointerSize + 1);
|
|
OS.EmitIntValue(dwarf::DW_LNE_set_address, 1);
|
|
OS.EmitSymbolValue(Label, PointerSize);
|
|
|
|
// emit the sequence for the LineDelta (from 1) and a zero address delta.
|
|
MCDwarfLineAddr::Emit(&OS, LineDelta, 0);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
|
|
const MCSymbol *LastLabel,
|
|
const MCSymbol *Label,
|
|
unsigned PointerSize) {
|
|
if (!LastLabel) {
|
|
emitDwarfSetLineAddr(*this, LineDelta, Label, PointerSize);
|
|
return;
|
|
}
|
|
const MCExpr *AddrDelta = buildSymbolDiff(*this, Label, LastLabel);
|
|
int64_t Res;
|
|
if (AddrDelta->EvaluateAsAbsolute(Res, getAssembler())) {
|
|
MCDwarfLineAddr::Emit(this, LineDelta, Res);
|
|
return;
|
|
}
|
|
insert(new MCDwarfLineAddrFragment(LineDelta, *AddrDelta));
|
|
}
|
|
|
|
void MCObjectStreamer::EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
|
|
const MCSymbol *Label) {
|
|
const MCExpr *AddrDelta = buildSymbolDiff(*this, Label, LastLabel);
|
|
int64_t Res;
|
|
if (AddrDelta->EvaluateAsAbsolute(Res, getAssembler())) {
|
|
MCDwarfFrameEmitter::EmitAdvanceLoc(*this, Res);
|
|
return;
|
|
}
|
|
insert(new MCDwarfCallFrameFragment(*AddrDelta));
|
|
}
|
|
|
|
void MCObjectStreamer::EmitBytes(StringRef Data) {
|
|
MCLineEntry::Make(this, getCurrentSection().first);
|
|
getOrCreateDataFragment()->getContents().append(Data.begin(), Data.end());
|
|
}
|
|
|
|
void MCObjectStreamer::EmitValueToAlignment(unsigned ByteAlignment,
|
|
int64_t Value,
|
|
unsigned ValueSize,
|
|
unsigned MaxBytesToEmit) {
|
|
if (MaxBytesToEmit == 0)
|
|
MaxBytesToEmit = ByteAlignment;
|
|
insert(new MCAlignFragment(ByteAlignment, Value, ValueSize, MaxBytesToEmit));
|
|
|
|
// Update the maximum alignment on the current section if necessary.
|
|
MCSection *CurSec = getCurrentSection().first;
|
|
if (ByteAlignment > CurSec->getAlignment())
|
|
CurSec->setAlignment(ByteAlignment);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitCodeAlignment(unsigned ByteAlignment,
|
|
unsigned MaxBytesToEmit) {
|
|
EmitValueToAlignment(ByteAlignment, 0, 1, MaxBytesToEmit);
|
|
cast<MCAlignFragment>(getCurrentFragment())->setEmitNops(true);
|
|
}
|
|
|
|
bool MCObjectStreamer::EmitValueToOffset(const MCExpr *Offset,
|
|
unsigned char Value) {
|
|
int64_t Res;
|
|
if (Offset->EvaluateAsAbsolute(Res, getAssembler())) {
|
|
insert(new MCOrgFragment(*Offset, Value));
|
|
return false;
|
|
}
|
|
|
|
MCSymbol *CurrentPos = getContext().createTempSymbol();
|
|
EmitLabel(CurrentPos);
|
|
MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
|
|
const MCExpr *Ref =
|
|
MCSymbolRefExpr::Create(CurrentPos, Variant, getContext());
|
|
const MCExpr *Delta =
|
|
MCBinaryExpr::Create(MCBinaryExpr::Sub, Offset, Ref, getContext());
|
|
|
|
if (!Delta->EvaluateAsAbsolute(Res, getAssembler()))
|
|
return true;
|
|
EmitFill(Res, Value);
|
|
return false;
|
|
}
|
|
|
|
// Associate GPRel32 fixup with data and resize data area
|
|
void MCObjectStreamer::EmitGPRel32Value(const MCExpr *Value) {
|
|
MCDataFragment *DF = getOrCreateDataFragment();
|
|
|
|
DF->getFixups().push_back(MCFixup::create(DF->getContents().size(),
|
|
Value, FK_GPRel_4));
|
|
DF->getContents().resize(DF->getContents().size() + 4, 0);
|
|
}
|
|
|
|
// Associate GPRel32 fixup with data and resize data area
|
|
void MCObjectStreamer::EmitGPRel64Value(const MCExpr *Value) {
|
|
MCDataFragment *DF = getOrCreateDataFragment();
|
|
|
|
DF->getFixups().push_back(MCFixup::create(DF->getContents().size(),
|
|
Value, FK_GPRel_4));
|
|
DF->getContents().resize(DF->getContents().size() + 8, 0);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue) {
|
|
// FIXME: A MCFillFragment would be more memory efficient but MCExpr has
|
|
// problems evaluating expressions across multiple fragments.
|
|
getOrCreateDataFragment()->getContents().append(NumBytes, FillValue);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitZeros(uint64_t NumBytes) {
|
|
const MCSection *Sec = getCurrentSection().first;
|
|
assert(Sec && "need a section");
|
|
unsigned ItemSize = Sec->isVirtualSection() ? 0 : 1;
|
|
insert(new MCFillFragment(0, ItemSize, NumBytes));
|
|
}
|
|
|
|
void MCObjectStreamer::FinishImpl() {
|
|
// If we are generating dwarf for assembly source files dump out the sections.
|
|
if (getContext().getGenDwarfForAssembly())
|
|
MCGenDwarfInfo::Emit(this);
|
|
|
|
// Dump out the dwarf file & directory tables and line tables.
|
|
MCDwarfLineTable::Emit(this);
|
|
|
|
flushPendingLabels(nullptr);
|
|
getAssembler().Finish();
|
|
}
|