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The code this patch removes was there to make sure the text sections went before the dwarf sections. That is necessary because MachO uses offsets relative to the start of the file, so adding a section can change relaxations. The dwarf sections were being printed at the start just to produce symbols pointing at the start of those sections. The underlying issue was fixed in r231898. The dwarf sections are now printed when they are about to be used, which is after we printed the text sections. To make sure we don't regress, the patch makes the MachO streamer assert if CodeGen puts anything unexpected after the DWARF sections. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232842 91177308-0d34-0410-b5e6-96231b3b80d8
503 lines
18 KiB
C++
503 lines
18 KiB
C++
//===-- MCMachOStreamer.cpp - MachO Streamer ------------------------------===//
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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/MCStreamer.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/MC/MCAsmBackend.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/MCInst.h"
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#include "llvm/MC/MCLinkerOptimizationHint.h"
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#include "llvm/MC/MCMachOSymbolFlags.h"
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#include "llvm/MC/MCObjectFileInfo.h"
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#include "llvm/MC/MCObjectStreamer.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/MCSectionMachO.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/Dwarf.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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namespace {
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class MCMachOStreamer : public MCObjectStreamer {
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private:
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/// LabelSections - true if each section change should emit a linker local
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/// label for use in relocations for assembler local references. Obviates the
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/// need for local relocations. False by default.
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bool LabelSections;
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bool DWARFMustBeAtTheEnd;
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bool CreatedADWARFSection;
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/// HasSectionLabel - map of which sections have already had a non-local
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/// label emitted to them. Used so we don't emit extraneous linker local
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/// labels in the middle of the section.
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DenseMap<const MCSection*, bool> HasSectionLabel;
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void EmitInstToData(const MCInst &Inst, const MCSubtargetInfo &STI) override;
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void EmitDataRegion(DataRegionData::KindTy Kind);
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void EmitDataRegionEnd();
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public:
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MCMachOStreamer(MCContext &Context, MCAsmBackend &MAB, raw_ostream &OS,
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MCCodeEmitter *Emitter, bool DWARFMustBeAtTheEnd, bool label)
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: MCObjectStreamer(Context, MAB, OS, Emitter), LabelSections(label),
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DWARFMustBeAtTheEnd(DWARFMustBeAtTheEnd), CreatedADWARFSection(false) {}
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/// state management
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void reset() override {
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HasSectionLabel.clear();
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MCObjectStreamer::reset();
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}
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/// @name MCStreamer Interface
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/// @{
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void ChangeSection(const MCSection *Sect, const MCExpr *Subsect) override;
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void EmitLabel(MCSymbol *Symbol) override;
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void EmitEHSymAttributes(const MCSymbol *Symbol, MCSymbol *EHSymbol) override;
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void EmitAssemblerFlag(MCAssemblerFlag Flag) override;
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void EmitLinkerOptions(ArrayRef<std::string> Options) override;
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void EmitDataRegion(MCDataRegionType Kind) override;
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void EmitVersionMin(MCVersionMinType Kind, unsigned Major,
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unsigned Minor, unsigned Update) override;
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void EmitThumbFunc(MCSymbol *Func) override;
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bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override;
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void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override;
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void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment) override;
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void BeginCOFFSymbolDef(const MCSymbol *Symbol) override {
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llvm_unreachable("macho doesn't support this directive");
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}
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void EmitCOFFSymbolStorageClass(int StorageClass) override {
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llvm_unreachable("macho doesn't support this directive");
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}
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void EmitCOFFSymbolType(int Type) override {
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llvm_unreachable("macho doesn't support this directive");
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}
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void EndCOFFSymbolDef() override {
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llvm_unreachable("macho doesn't support this directive");
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}
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void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) override {
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llvm_unreachable("macho doesn't support this directive");
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}
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void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment) override;
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void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = nullptr,
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uint64_t Size = 0, unsigned ByteAlignment = 0) override;
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void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment = 0) override;
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void EmitFileDirective(StringRef Filename) override {
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// FIXME: Just ignore the .file; it isn't important enough to fail the
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// entire assembly.
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// report_fatal_error("unsupported directive: '.file'");
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}
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void EmitIdent(StringRef IdentString) override {
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llvm_unreachable("macho doesn't support this directive");
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}
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void EmitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) override {
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getAssembler().getLOHContainer().addDirective(Kind, Args);
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}
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void FinishImpl() override;
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};
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} // end anonymous namespace.
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static bool canGoAfterDWARF(const MCSectionMachO &MSec) {
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// These sections are created by the assembler itself after the end of
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// the .s file.
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StringRef SegName = MSec.getSegmentName();
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StringRef SecName = MSec.getSectionName();
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if (SegName == "__LD" && SecName == "__compact_unwind")
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return true;
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if (SegName == "__IMPORT") {
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if (SecName == "__jump_table")
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return true;
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if (SecName == "__pointers")
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return true;
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}
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if (SegName == "__TEXT" && SecName == "__eh_frame")
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return true;
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if (SegName == "__DATA" && SecName == "__nl_symbol_ptr")
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return true;
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return false;
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}
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void MCMachOStreamer::ChangeSection(const MCSection *Section,
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const MCExpr *Subsection) {
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// Change the section normally.
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bool Created = MCObjectStreamer::changeSectionImpl(Section, Subsection);
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const MCSectionMachO &MSec = *cast<MCSectionMachO>(Section);
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StringRef SegName = MSec.getSegmentName();
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if (SegName == "__DWARF")
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CreatedADWARFSection = true;
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else if (Created && DWARFMustBeAtTheEnd && !canGoAfterDWARF(MSec))
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assert(!CreatedADWARFSection && "Creating regular section after DWARF");
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// Output a linker-local symbol so we don't need section-relative local
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// relocations. The linker hates us when we do that.
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if (LabelSections && !HasSectionLabel[Section]) {
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MCSymbol *Label = getContext().CreateLinkerPrivateTempSymbol();
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EmitLabel(Label);
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HasSectionLabel[Section] = true;
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}
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}
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void MCMachOStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
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MCSymbol *EHSymbol) {
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MCSymbolData &SD =
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getAssembler().getOrCreateSymbolData(*Symbol);
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if (SD.isExternal())
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EmitSymbolAttribute(EHSymbol, MCSA_Global);
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if (SD.getFlags() & SF_WeakDefinition)
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EmitSymbolAttribute(EHSymbol, MCSA_WeakDefinition);
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if (SD.isPrivateExtern())
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EmitSymbolAttribute(EHSymbol, MCSA_PrivateExtern);
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}
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void MCMachOStreamer::EmitLabel(MCSymbol *Symbol) {
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assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
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// isSymbolLinkerVisible uses the section.
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AssignSection(Symbol, getCurrentSection().first);
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// We have to create a new fragment if this is an atom defining symbol,
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// fragments cannot span atoms.
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if (getAssembler().isSymbolLinkerVisible(*Symbol))
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insert(new MCDataFragment());
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MCObjectStreamer::EmitLabel(Symbol);
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MCSymbolData &SD = getAssembler().getSymbolData(*Symbol);
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// This causes the reference type flag to be cleared. Darwin 'as' was "trying"
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// to clear the weak reference and weak definition bits too, but the
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// implementation was buggy. For now we just try to match 'as', for
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// diffability.
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//
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// FIXME: Cleanup this code, these bits should be emitted based on semantic
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// properties, not on the order of definition, etc.
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SD.setFlags(SD.getFlags() & ~SF_ReferenceTypeMask);
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}
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void MCMachOStreamer::EmitDataRegion(DataRegionData::KindTy Kind) {
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if (!getAssembler().getBackend().hasDataInCodeSupport())
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return;
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// Create a temporary label to mark the start of the data region.
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MCSymbol *Start = getContext().CreateTempSymbol();
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EmitLabel(Start);
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// Record the region for the object writer to use.
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DataRegionData Data = { Kind, Start, nullptr };
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std::vector<DataRegionData> &Regions = getAssembler().getDataRegions();
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Regions.push_back(Data);
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}
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void MCMachOStreamer::EmitDataRegionEnd() {
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if (!getAssembler().getBackend().hasDataInCodeSupport())
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return;
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std::vector<DataRegionData> &Regions = getAssembler().getDataRegions();
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assert(!Regions.empty() && "Mismatched .end_data_region!");
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DataRegionData &Data = Regions.back();
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assert(!Data.End && "Mismatched .end_data_region!");
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// Create a temporary label to mark the end of the data region.
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Data.End = getContext().CreateTempSymbol();
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EmitLabel(Data.End);
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}
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void MCMachOStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
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// Let the target do whatever target specific stuff it needs to do.
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getAssembler().getBackend().handleAssemblerFlag(Flag);
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// Do any generic stuff we need to do.
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switch (Flag) {
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case MCAF_SyntaxUnified: return; // no-op here.
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case MCAF_Code16: return; // Change parsing mode; no-op here.
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case MCAF_Code32: return; // Change parsing mode; no-op here.
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case MCAF_Code64: return; // Change parsing mode; no-op here.
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case MCAF_SubsectionsViaSymbols:
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getAssembler().setSubsectionsViaSymbols(true);
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return;
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}
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}
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void MCMachOStreamer::EmitLinkerOptions(ArrayRef<std::string> Options) {
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getAssembler().getLinkerOptions().push_back(Options);
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}
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void MCMachOStreamer::EmitDataRegion(MCDataRegionType Kind) {
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switch (Kind) {
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case MCDR_DataRegion:
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EmitDataRegion(DataRegionData::Data);
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return;
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case MCDR_DataRegionJT8:
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EmitDataRegion(DataRegionData::JumpTable8);
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return;
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case MCDR_DataRegionJT16:
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EmitDataRegion(DataRegionData::JumpTable16);
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return;
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case MCDR_DataRegionJT32:
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EmitDataRegion(DataRegionData::JumpTable32);
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return;
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case MCDR_DataRegionEnd:
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EmitDataRegionEnd();
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return;
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}
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}
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void MCMachOStreamer::EmitVersionMin(MCVersionMinType Kind, unsigned Major,
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unsigned Minor, unsigned Update) {
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getAssembler().setVersionMinInfo(Kind, Major, Minor, Update);
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}
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void MCMachOStreamer::EmitThumbFunc(MCSymbol *Symbol) {
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// Remember that the function is a thumb function. Fixup and relocation
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// values will need adjusted.
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getAssembler().setIsThumbFunc(Symbol);
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}
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bool MCMachOStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
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MCSymbolAttr Attribute) {
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// Indirect symbols are handled differently, to match how 'as' handles
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// them. This makes writing matching .o files easier.
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if (Attribute == MCSA_IndirectSymbol) {
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// Note that we intentionally cannot use the symbol data here; this is
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// important for matching the string table that 'as' generates.
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IndirectSymbolData ISD;
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ISD.Symbol = Symbol;
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ISD.SectionData = getCurrentSectionData();
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getAssembler().getIndirectSymbols().push_back(ISD);
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return true;
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}
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// Adding a symbol attribute always introduces the symbol, note that an
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// important side effect of calling getOrCreateSymbolData here is to register
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// the symbol with the assembler.
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MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
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// The implementation of symbol attributes is designed to match 'as', but it
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// leaves much to desired. It doesn't really make sense to arbitrarily add and
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// remove flags, but 'as' allows this (in particular, see .desc).
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//
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// In the future it might be worth trying to make these operations more well
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// defined.
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switch (Attribute) {
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case MCSA_Invalid:
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case MCSA_ELF_TypeFunction:
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case MCSA_ELF_TypeIndFunction:
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case MCSA_ELF_TypeObject:
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case MCSA_ELF_TypeTLS:
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case MCSA_ELF_TypeCommon:
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case MCSA_ELF_TypeNoType:
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case MCSA_ELF_TypeGnuUniqueObject:
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case MCSA_Hidden:
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case MCSA_IndirectSymbol:
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case MCSA_Internal:
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case MCSA_Protected:
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case MCSA_Weak:
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case MCSA_Local:
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return false;
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case MCSA_Global:
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SD.setExternal(true);
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// This effectively clears the undefined lazy bit, in Darwin 'as', although
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// it isn't very consistent because it implements this as part of symbol
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// lookup.
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//
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// FIXME: Cleanup this code, these bits should be emitted based on semantic
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// properties, not on the order of definition, etc.
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SD.setFlags(SD.getFlags() & ~SF_ReferenceTypeUndefinedLazy);
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break;
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case MCSA_LazyReference:
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// FIXME: This requires -dynamic.
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SD.setFlags(SD.getFlags() | SF_NoDeadStrip);
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if (Symbol->isUndefined())
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SD.setFlags(SD.getFlags() | SF_ReferenceTypeUndefinedLazy);
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break;
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// Since .reference sets the no dead strip bit, it is equivalent to
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// .no_dead_strip in practice.
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case MCSA_Reference:
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case MCSA_NoDeadStrip:
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SD.setFlags(SD.getFlags() | SF_NoDeadStrip);
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break;
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case MCSA_SymbolResolver:
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SD.setFlags(SD.getFlags() | SF_SymbolResolver);
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break;
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case MCSA_PrivateExtern:
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SD.setExternal(true);
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SD.setPrivateExtern(true);
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break;
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case MCSA_WeakReference:
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// FIXME: This requires -dynamic.
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if (Symbol->isUndefined())
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SD.setFlags(SD.getFlags() | SF_WeakReference);
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break;
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case MCSA_WeakDefinition:
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// FIXME: 'as' enforces that this is defined and global. The manual claims
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// it has to be in a coalesced section, but this isn't enforced.
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SD.setFlags(SD.getFlags() | SF_WeakDefinition);
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break;
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case MCSA_WeakDefAutoPrivate:
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SD.setFlags(SD.getFlags() | SF_WeakDefinition | SF_WeakReference);
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break;
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}
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return true;
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}
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void MCMachOStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
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// Encode the 'desc' value into the lowest implementation defined bits.
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assert(DescValue == (DescValue & SF_DescFlagsMask) &&
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"Invalid .desc value!");
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getAssembler().getOrCreateSymbolData(*Symbol).setFlags(
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DescValue & SF_DescFlagsMask);
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}
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void MCMachOStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment) {
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// FIXME: Darwin 'as' does appear to allow redef of a .comm by itself.
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assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
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AssignSection(Symbol, nullptr);
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MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
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SD.setExternal(true);
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SD.setCommon(Size, ByteAlignment);
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}
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void MCMachOStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment) {
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// '.lcomm' is equivalent to '.zerofill'.
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return EmitZerofill(getContext().getObjectFileInfo()->getDataBSSSection(),
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Symbol, Size, ByteAlignment);
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}
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void MCMachOStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
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uint64_t Size, unsigned ByteAlignment) {
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MCSectionData &SectData = getAssembler().getOrCreateSectionData(*Section);
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// The symbol may not be present, which only creates the section.
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if (!Symbol)
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return;
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// On darwin all virtual sections have zerofill type.
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assert(Section->isVirtualSection() && "Section does not have zerofill type!");
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assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
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MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
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// Emit an align fragment if necessary.
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if (ByteAlignment != 1)
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new MCAlignFragment(ByteAlignment, 0, 0, ByteAlignment, &SectData);
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MCFragment *F = new MCFillFragment(0, 0, Size, &SectData);
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SD.setFragment(F);
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AssignSection(Symbol, Section);
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// Update the maximum alignment on the zero fill section if necessary.
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if (ByteAlignment > SectData.getAlignment())
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SectData.setAlignment(ByteAlignment);
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}
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// This should always be called with the thread local bss section. Like the
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// .zerofill directive this doesn't actually switch sections on us.
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void MCMachOStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
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uint64_t Size, unsigned ByteAlignment) {
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EmitZerofill(Section, Symbol, Size, ByteAlignment);
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return;
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}
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void MCMachOStreamer::EmitInstToData(const MCInst &Inst,
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const MCSubtargetInfo &STI) {
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MCDataFragment *DF = getOrCreateDataFragment();
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SmallVector<MCFixup, 4> Fixups;
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SmallString<256> Code;
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raw_svector_ostream VecOS(Code);
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getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, Fixups, STI);
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VecOS.flush();
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// Add the fixups and data.
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for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
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Fixups[i].setOffset(Fixups[i].getOffset() + DF->getContents().size());
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DF->getFixups().push_back(Fixups[i]);
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}
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DF->getContents().append(Code.begin(), Code.end());
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}
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void MCMachOStreamer::FinishImpl() {
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EmitFrames(&getAssembler().getBackend());
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// 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 DWARFMustBeAtTheEnd,
|
|
bool LabelSections) {
|
|
MCMachOStreamer *S = new MCMachOStreamer(Context, MAB, OS, CE,
|
|
DWARFMustBeAtTheEnd, LabelSections);
|
|
if (RelaxAll)
|
|
S->getAssembler().setRelaxAll(true);
|
|
return S;
|
|
}
|