mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-26 23:29:22 +00:00
a2f9a2c30d
This replaces several "compile unit ID -> thing" mappings in favor of one mapping from CUID to the whole line table structure (files, directories, and lines). This is another step along the way to refactoring out reusable components of line table handling for use when generating debug_line.dwo for fission type units. Also, might be a good basis to fold some of this handling down into MCStreamers to avoid the special case of "One line table when doing asm printing, line table per CU otherwise" by building it into the different MCStreamer implementations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203821 91177308-0d34-0410-b5e6-96231b3b80d8
391 lines
14 KiB
C++
391 lines
14 KiB
C++
//===- lib/MC/MCObjectStreamer.cpp - Object File MCStreamer Interface -----===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCObjectStreamer.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/MC/MCAsmBackend.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCCodeEmitter.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCDwarf.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCObjectWriter.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/ErrorHandling.h"
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using namespace llvm;
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MCObjectStreamer::MCObjectStreamer(MCContext &Context, MCAsmBackend &TAB,
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raw_ostream &OS, MCCodeEmitter *Emitter_)
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: MCStreamer(Context),
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Assembler(new MCAssembler(Context, TAB, *Emitter_,
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*TAB.createObjectWriter(OS), OS)),
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CurSectionData(0) {}
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MCObjectStreamer::MCObjectStreamer(MCContext &Context, MCAsmBackend &TAB,
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raw_ostream &OS, MCCodeEmitter *Emitter_,
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MCAssembler *_Assembler)
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: MCStreamer(Context), Assembler(_Assembler), CurSectionData(0) {}
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MCObjectStreamer::~MCObjectStreamer() {
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delete &Assembler->getBackend();
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delete &Assembler->getEmitter();
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delete &Assembler->getWriter();
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delete Assembler;
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}
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void MCObjectStreamer::reset() {
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if (Assembler)
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Assembler->reset();
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CurSectionData = 0;
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CurInsertionPoint = MCSectionData::iterator();
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MCStreamer::reset();
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}
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MCFragment *MCObjectStreamer::getCurrentFragment() const {
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assert(getCurrentSectionData() && "No current section!");
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if (CurInsertionPoint != getCurrentSectionData()->getFragmentList().begin())
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return std::prev(CurInsertionPoint);
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return 0;
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}
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MCDataFragment *MCObjectStreamer::getOrCreateDataFragment() const {
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MCDataFragment *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
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// When bundling is enabled, we don't want to add data to a fragment that
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// already has instructions (see MCELFStreamer::EmitInstToData for details)
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if (!F || (Assembler->isBundlingEnabled() && F->hasInstructions())) {
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F = new MCDataFragment();
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insert(F);
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}
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return F;
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}
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const MCExpr *MCObjectStreamer::AddValueSymbols(const MCExpr *Value) {
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switch (Value->getKind()) {
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case MCExpr::Target:
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cast<MCTargetExpr>(Value)->AddValueSymbols(Assembler);
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break;
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case MCExpr::Constant:
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break;
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case MCExpr::Binary: {
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const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value);
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AddValueSymbols(BE->getLHS());
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AddValueSymbols(BE->getRHS());
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break;
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}
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case MCExpr::SymbolRef:
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Assembler->getOrCreateSymbolData(cast<MCSymbolRefExpr>(Value)->getSymbol());
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break;
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case MCExpr::Unary:
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AddValueSymbols(cast<MCUnaryExpr>(Value)->getSubExpr());
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break;
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}
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return Value;
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}
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void MCObjectStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size) {
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MCDataFragment *DF = getOrCreateDataFragment();
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MCLineEntry::Make(this, getCurrentSection().first);
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// Avoid fixups when possible.
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int64_t AbsValue;
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if (AddValueSymbols(Value)->EvaluateAsAbsolute(AbsValue, getAssembler())) {
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EmitIntValue(AbsValue, Size);
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return;
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}
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DF->getFixups().push_back(
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MCFixup::Create(DF->getContents().size(), Value,
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MCFixup::getKindForSize(Size, false)));
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DF->getContents().resize(DF->getContents().size() + Size, 0);
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}
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void MCObjectStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
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RecordProcStart(Frame);
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}
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void MCObjectStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
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RecordProcEnd(Frame);
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}
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void MCObjectStreamer::EmitLabel(MCSymbol *Symbol) {
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MCStreamer::EmitLabel(Symbol);
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MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
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// FIXME: This is wasteful, we don't necessarily need to create a data
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// fragment. Instead, we should mark the symbol as pointing into the data
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// fragment if it exists, otherwise we should just queue the label and set its
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// fragment pointer when we emit the next fragment.
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MCDataFragment *F = getOrCreateDataFragment();
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assert(!SD.getFragment() && "Unexpected fragment on symbol data!");
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SD.setFragment(F);
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SD.setOffset(F->getContents().size());
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}
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void MCObjectStreamer::EmitDebugLabel(MCSymbol *Symbol) {
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EmitLabel(Symbol);
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}
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void MCObjectStreamer::EmitULEB128Value(const MCExpr *Value) {
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int64_t IntValue;
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if (Value->EvaluateAsAbsolute(IntValue, getAssembler())) {
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EmitULEB128IntValue(IntValue);
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return;
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}
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Value = ForceExpAbs(Value);
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insert(new MCLEBFragment(*Value, false));
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}
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void MCObjectStreamer::EmitSLEB128Value(const MCExpr *Value) {
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int64_t IntValue;
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if (Value->EvaluateAsAbsolute(IntValue, getAssembler())) {
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EmitSLEB128IntValue(IntValue);
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return;
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}
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Value = ForceExpAbs(Value);
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insert(new MCLEBFragment(*Value, true));
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}
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void MCObjectStreamer::EmitWeakReference(MCSymbol *Alias,
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const MCSymbol *Symbol) {
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report_fatal_error("This file format doesn't support weak aliases.");
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}
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void MCObjectStreamer::ChangeSection(const MCSection *Section,
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const MCExpr *Subsection) {
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assert(Section && "Cannot switch to a null section!");
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CurSectionData = &getAssembler().getOrCreateSectionData(*Section);
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int64_t IntSubsection = 0;
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if (Subsection &&
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!Subsection->EvaluateAsAbsolute(IntSubsection, getAssembler()))
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report_fatal_error("Cannot evaluate subsection number");
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if (IntSubsection < 0 || IntSubsection > 8192)
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report_fatal_error("Subsection number out of range");
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CurInsertionPoint =
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CurSectionData->getSubsectionInsertionPoint(unsigned(IntSubsection));
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}
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void MCObjectStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
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getAssembler().getOrCreateSymbolData(*Symbol);
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Symbol->setVariableValue(AddValueSymbols(Value));
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}
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void MCObjectStreamer::EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) {
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// Scan for values.
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for (unsigned i = Inst.getNumOperands(); i--; )
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if (Inst.getOperand(i).isExpr())
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AddValueSymbols(Inst.getOperand(i).getExpr());
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MCSectionData *SD = getCurrentSectionData();
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SD->setHasInstructions(true);
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// Now that a machine instruction has been assembled into this section, make
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// a line entry for any .loc directive that has been seen.
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MCLineEntry::Make(this, getCurrentSection().first);
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// If this instruction doesn't need relaxation, just emit it as data.
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MCAssembler &Assembler = getAssembler();
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if (!Assembler.getBackend().mayNeedRelaxation(Inst)) {
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EmitInstToData(Inst, STI);
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return;
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}
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// Otherwise, relax and emit it as data if either:
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// - The RelaxAll flag was passed
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// - Bundling is enabled and this instruction is inside a bundle-locked
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// group. We want to emit all such instructions into the same data
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// fragment.
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if (Assembler.getRelaxAll() ||
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(Assembler.isBundlingEnabled() && SD->isBundleLocked())) {
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MCInst Relaxed;
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getAssembler().getBackend().relaxInstruction(Inst, Relaxed);
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while (getAssembler().getBackend().mayNeedRelaxation(Relaxed))
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getAssembler().getBackend().relaxInstruction(Relaxed, Relaxed);
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EmitInstToData(Relaxed, STI);
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return;
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}
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// Otherwise emit to a separate fragment.
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EmitInstToFragment(Inst, STI);
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}
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void MCObjectStreamer::EmitInstToFragment(const MCInst &Inst,
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const MCSubtargetInfo &STI) {
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// Always create a new, separate fragment here, because its size can change
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// during relaxation.
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MCRelaxableFragment *IF = new MCRelaxableFragment(Inst, STI);
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insert(IF);
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SmallString<128> Code;
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raw_svector_ostream VecOS(Code);
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getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, IF->getFixups(),
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STI);
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VecOS.flush();
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IF->getContents().append(Code.begin(), Code.end());
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}
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#ifndef NDEBUG
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static const char *const BundlingNotImplementedMsg =
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"Aligned bundling is not implemented for this object format";
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#endif
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void MCObjectStreamer::EmitBundleAlignMode(unsigned AlignPow2) {
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llvm_unreachable(BundlingNotImplementedMsg);
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}
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void MCObjectStreamer::EmitBundleLock(bool AlignToEnd) {
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llvm_unreachable(BundlingNotImplementedMsg);
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}
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void MCObjectStreamer::EmitBundleUnlock() {
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llvm_unreachable(BundlingNotImplementedMsg);
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}
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void MCObjectStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
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unsigned Column, unsigned Flags,
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unsigned Isa,
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unsigned Discriminator,
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StringRef FileName) {
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// In case we see two .loc directives in a row, make sure the
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// first one gets a line entry.
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MCLineEntry::Make(this, getCurrentSection().first);
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this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
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Isa, Discriminator, FileName);
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}
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void MCObjectStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
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const MCSymbol *LastLabel,
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const MCSymbol *Label,
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unsigned PointerSize) {
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if (!LastLabel) {
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EmitDwarfSetLineAddr(LineDelta, Label, PointerSize);
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return;
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}
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const MCExpr *AddrDelta = BuildSymbolDiff(getContext(), Label, LastLabel);
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int64_t Res;
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if (AddrDelta->EvaluateAsAbsolute(Res, getAssembler())) {
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MCDwarfLineAddr::Emit(this, LineDelta, Res);
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return;
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}
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AddrDelta = ForceExpAbs(AddrDelta);
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insert(new MCDwarfLineAddrFragment(LineDelta, *AddrDelta));
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}
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void MCObjectStreamer::EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
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const MCSymbol *Label) {
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const MCExpr *AddrDelta = BuildSymbolDiff(getContext(), Label, LastLabel);
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int64_t Res;
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if (AddrDelta->EvaluateAsAbsolute(Res, getAssembler())) {
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MCDwarfFrameEmitter::EmitAdvanceLoc(*this, Res);
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return;
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}
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AddrDelta = ForceExpAbs(AddrDelta);
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insert(new MCDwarfCallFrameFragment(*AddrDelta));
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}
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void MCObjectStreamer::EmitBytes(StringRef Data) {
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MCLineEntry::Make(this, getCurrentSection().first);
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getOrCreateDataFragment()->getContents().append(Data.begin(), Data.end());
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}
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void MCObjectStreamer::EmitValueToAlignment(unsigned ByteAlignment,
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int64_t Value,
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unsigned ValueSize,
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unsigned MaxBytesToEmit) {
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if (MaxBytesToEmit == 0)
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MaxBytesToEmit = ByteAlignment;
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insert(new MCAlignFragment(ByteAlignment, Value, ValueSize, MaxBytesToEmit));
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// Update the maximum alignment on the current section if necessary.
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if (ByteAlignment > getCurrentSectionData()->getAlignment())
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getCurrentSectionData()->setAlignment(ByteAlignment);
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}
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void MCObjectStreamer::EmitCodeAlignment(unsigned ByteAlignment,
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unsigned MaxBytesToEmit) {
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EmitValueToAlignment(ByteAlignment, 0, 1, MaxBytesToEmit);
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cast<MCAlignFragment>(getCurrentFragment())->setEmitNops(true);
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}
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bool MCObjectStreamer::EmitValueToOffset(const MCExpr *Offset,
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unsigned char Value) {
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int64_t Res;
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if (Offset->EvaluateAsAbsolute(Res, getAssembler())) {
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insert(new MCOrgFragment(*Offset, Value));
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return false;
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}
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MCSymbol *CurrentPos = getContext().CreateTempSymbol();
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EmitLabel(CurrentPos);
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MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
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const MCExpr *Ref =
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MCSymbolRefExpr::Create(CurrentPos, Variant, getContext());
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const MCExpr *Delta =
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MCBinaryExpr::Create(MCBinaryExpr::Sub, Offset, Ref, getContext());
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if (!Delta->EvaluateAsAbsolute(Res, getAssembler()))
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return true;
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EmitFill(Res, Value);
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return false;
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}
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// Associate GPRel32 fixup with data and resize data area
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void MCObjectStreamer::EmitGPRel32Value(const MCExpr *Value) {
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MCDataFragment *DF = getOrCreateDataFragment();
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DF->getFixups().push_back(MCFixup::Create(DF->getContents().size(),
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Value, FK_GPRel_4));
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DF->getContents().resize(DF->getContents().size() + 4, 0);
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}
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// Associate GPRel32 fixup with data and resize data area
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void MCObjectStreamer::EmitGPRel64Value(const MCExpr *Value) {
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MCDataFragment *DF = getOrCreateDataFragment();
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DF->getFixups().push_back(MCFixup::Create(DF->getContents().size(),
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Value, FK_GPRel_4));
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DF->getContents().resize(DF->getContents().size() + 8, 0);
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}
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void MCObjectStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue) {
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// FIXME: A MCFillFragment would be more memory efficient but MCExpr has
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// problems evaluating expressions across multiple fragments.
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getOrCreateDataFragment()->getContents().append(NumBytes, FillValue);
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}
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void MCObjectStreamer::EmitZeros(uint64_t NumBytes) {
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unsigned ItemSize = getCurrentSection().first->isVirtualSection() ? 0 : 1;
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insert(new MCFillFragment(0, ItemSize, NumBytes));
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}
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void MCObjectStreamer::FinishImpl() {
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// Dump out the dwarf file & directory tables and line tables.
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const MCSymbol *LineSectionSymbol = NULL;
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if (getContext().hasMCLineSections())
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LineSectionSymbol = MCDwarfFileTable::Emit(this);
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// If we are generating dwarf for assembly source files dump out the sections.
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if (getContext().getGenDwarfForAssembly())
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MCGenDwarfInfo::Emit(this, LineSectionSymbol);
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getAssembler().Finish();
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}
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