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Imported Upstream version 5.18.0.167
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//===- lib/MC/AArch64ELFStreamer.cpp - ELF Object Output for AArch64 ------===//
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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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//
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// This file assembles .s files and emits AArch64 ELF .o object files. Different
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// from generic ELF streamer in emitting mapping symbols ($x and $d) to delimit
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// regions of data and code.
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//
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//===----------------------------------------------------------------------===//
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#include "AArch64TargetStreamer.h"
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#include "AArch64WinCOFFStreamer.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/BinaryFormat/ELF.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/MCELFStreamer.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/MCSection.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/MC/MCSymbolELF.h"
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#include "llvm/MC/MCWinCOFFStreamer.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/FormattedStream.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 AArch64ELFStreamer;
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class AArch64TargetAsmStreamer : public AArch64TargetStreamer {
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formatted_raw_ostream &OS;
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void emitInst(uint32_t Inst) override;
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public:
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AArch64TargetAsmStreamer(MCStreamer &S, formatted_raw_ostream &OS);
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};
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AArch64TargetAsmStreamer::AArch64TargetAsmStreamer(MCStreamer &S,
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formatted_raw_ostream &OS)
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: AArch64TargetStreamer(S), OS(OS) {}
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void AArch64TargetAsmStreamer::emitInst(uint32_t Inst) {
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OS << "\t.inst\t0x" << Twine::utohexstr(Inst) << "\n";
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}
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class AArch64TargetELFStreamer : public AArch64TargetStreamer {
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private:
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AArch64ELFStreamer &getStreamer();
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void emitInst(uint32_t Inst) override;
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public:
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AArch64TargetELFStreamer(MCStreamer &S) : AArch64TargetStreamer(S) {}
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};
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/// Extend the generic ELFStreamer class so that it can emit mapping symbols at
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/// the appropriate points in the object files. These symbols are defined in the
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/// AArch64 ELF ABI:
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/// infocenter.arm.com/help/topic/com.arm.doc.ihi0056a/IHI0056A_aaelf64.pdf
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///
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/// In brief: $x or $d should be emitted at the start of each contiguous region
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/// of A64 code or data in a section. In practice, this emission does not rely
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/// on explicit assembler directives but on inherent properties of the
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/// directives doing the emission (e.g. ".byte" is data, "add x0, x0, x0" an
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/// instruction).
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///
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/// As a result this system is orthogonal to the DataRegion infrastructure used
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/// by MachO. Beware!
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class AArch64ELFStreamer : public MCELFStreamer {
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public:
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friend class AArch64TargetELFStreamer;
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AArch64ELFStreamer(MCContext &Context, std::unique_ptr<MCAsmBackend> TAB,
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raw_pwrite_stream &OS,
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std::unique_ptr<MCCodeEmitter> Emitter)
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: MCELFStreamer(Context, std::move(TAB), OS, std::move(Emitter)),
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MappingSymbolCounter(0), LastEMS(EMS_None) {}
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void ChangeSection(MCSection *Section, const MCExpr *Subsection) override {
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// We have to keep track of the mapping symbol state of any sections we
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// use. Each one should start off as EMS_None, which is provided as the
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// default constructor by DenseMap::lookup.
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LastMappingSymbols[getPreviousSection().first] = LastEMS;
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LastEMS = LastMappingSymbols.lookup(Section);
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MCELFStreamer::ChangeSection(Section, Subsection);
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}
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// Reset state between object emissions
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void reset() override {
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MappingSymbolCounter = 0;
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MCELFStreamer::reset();
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LastMappingSymbols.clear();
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LastEMS = EMS_None;
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}
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/// This function is the one used to emit instruction data into the ELF
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/// streamer. We override it to add the appropriate mapping symbol if
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/// necessary.
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void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI,
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bool) override {
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EmitA64MappingSymbol();
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MCELFStreamer::EmitInstruction(Inst, STI);
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}
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/// Emit a 32-bit value as an instruction. This is only used for the .inst
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/// directive, EmitInstruction should be used in other cases.
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void emitInst(uint32_t Inst) {
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char Buffer[4];
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// We can't just use EmitIntValue here, as that will emit a data mapping
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// symbol, and swap the endianness on big-endian systems (instructions are
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// always little-endian).
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for (unsigned I = 0; I < 4; ++I) {
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Buffer[I] = uint8_t(Inst);
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Inst >>= 8;
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}
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EmitA64MappingSymbol();
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MCELFStreamer::EmitBytes(StringRef(Buffer, 4));
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}
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/// This is one of the functions used to emit data into an ELF section, so the
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/// AArch64 streamer overrides it to add the appropriate mapping symbol ($d)
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/// if necessary.
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void EmitBytes(StringRef Data) override {
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EmitDataMappingSymbol();
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MCELFStreamer::EmitBytes(Data);
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}
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/// This is one of the functions used to emit data into an ELF section, so the
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/// AArch64 streamer overrides it to add the appropriate mapping symbol ($d)
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/// if necessary.
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void EmitValueImpl(const MCExpr *Value, unsigned Size, SMLoc Loc) override {
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EmitDataMappingSymbol();
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MCELFStreamer::EmitValueImpl(Value, Size, Loc);
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}
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private:
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enum ElfMappingSymbol {
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EMS_None,
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EMS_A64,
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EMS_Data
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};
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void EmitDataMappingSymbol() {
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if (LastEMS == EMS_Data)
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return;
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EmitMappingSymbol("$d");
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LastEMS = EMS_Data;
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}
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void EmitA64MappingSymbol() {
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if (LastEMS == EMS_A64)
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return;
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EmitMappingSymbol("$x");
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LastEMS = EMS_A64;
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}
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void EmitMappingSymbol(StringRef Name) {
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auto *Symbol = cast<MCSymbolELF>(getContext().getOrCreateSymbol(
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Name + "." + Twine(MappingSymbolCounter++)));
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EmitLabel(Symbol);
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Symbol->setType(ELF::STT_NOTYPE);
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Symbol->setBinding(ELF::STB_LOCAL);
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Symbol->setExternal(false);
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}
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int64_t MappingSymbolCounter;
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DenseMap<const MCSection *, ElfMappingSymbol> LastMappingSymbols;
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ElfMappingSymbol LastEMS;
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};
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} // end anonymous namespace
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AArch64ELFStreamer &AArch64TargetELFStreamer::getStreamer() {
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return static_cast<AArch64ELFStreamer &>(Streamer);
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}
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void AArch64TargetELFStreamer::emitInst(uint32_t Inst) {
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getStreamer().emitInst(Inst);
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}
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namespace llvm {
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MCTargetStreamer *createAArch64AsmTargetStreamer(MCStreamer &S,
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formatted_raw_ostream &OS,
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MCInstPrinter *InstPrint,
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bool isVerboseAsm) {
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return new AArch64TargetAsmStreamer(S, OS);
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}
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MCELFStreamer *createAArch64ELFStreamer(MCContext &Context,
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std::unique_ptr<MCAsmBackend> TAB,
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raw_pwrite_stream &OS,
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std::unique_ptr<MCCodeEmitter> Emitter,
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bool RelaxAll) {
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AArch64ELFStreamer *S =
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new AArch64ELFStreamer(Context, std::move(TAB), OS, std::move(Emitter));
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if (RelaxAll)
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S->getAssembler().setRelaxAll(true);
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return S;
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}
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MCTargetStreamer *
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createAArch64ObjectTargetStreamer(MCStreamer &S, const MCSubtargetInfo &STI) {
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const Triple &TT = STI.getTargetTriple();
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if (TT.isOSBinFormatELF())
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return new AArch64TargetELFStreamer(S);
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if (TT.isOSBinFormatCOFF())
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return new AArch64TargetWinCOFFStreamer(S);
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return nullptr;
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}
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} // end namespace llvm
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