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https://github.com/c64scene-ar/llvm-6502.git
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Any code creating an MCSectionELF knows ELF and already provides the flags. SectionKind is an abstraction used by common code that uses a plain MCSection. Use the flags to compute the SectionKind. This removes a lot of guessing and boilerplate from the MCSectionELF construction. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227476 91177308-0d34-0410-b5e6-96231b3b80d8
1381 lines
44 KiB
C++
1381 lines
44 KiB
C++
//===- lib/MC/ARMELFStreamer.cpp - ELF Object Output for ARM --------------===//
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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 ARM ELF .o object files. Different
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// from generic ELF streamer in emitting mapping symbols ($a, $t and $d) to
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// delimit regions of data and code.
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//
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//===----------------------------------------------------------------------===//
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#include "ARMArchName.h"
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#include "ARMFPUName.h"
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#include "ARMRegisterInfo.h"
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#include "ARMUnwindOpAsm.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/Twine.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/MCELF.h"
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#include "llvm/MC/MCELFStreamer.h"
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#include "llvm/MC/MCELFSymbolFlags.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/MCInstPrinter.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/MCRegisterInfo.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/MCSectionELF.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/MC/MCValue.h"
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#include "llvm/Support/ARMBuildAttributes.h"
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#include "llvm/Support/ARMEHABI.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ELF.h"
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#include "llvm/Support/FormattedStream.h"
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#include "llvm/Support/LEB128.h"
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#include "llvm/Support/raw_ostream.h"
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#include <algorithm>
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using namespace llvm;
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static std::string GetAEABIUnwindPersonalityName(unsigned Index) {
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assert(Index < ARM::EHABI::NUM_PERSONALITY_INDEX &&
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"Invalid personality index");
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return (Twine("__aeabi_unwind_cpp_pr") + Twine(Index)).str();
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}
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static const char *GetFPUName(unsigned ID) {
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switch (ID) {
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default:
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llvm_unreachable("Unknown FPU kind");
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break;
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#define ARM_FPU_NAME(NAME, ID) case ARM::ID: return NAME;
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#include "ARMFPUName.def"
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}
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return nullptr;
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}
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static const char *GetArchName(unsigned ID) {
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switch (ID) {
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default:
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llvm_unreachable("Unknown ARCH kind");
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break;
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#define ARM_ARCH_NAME(NAME, ID, DEFAULT_CPU_NAME, DEFAULT_CPU_ARCH) \
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case ARM::ID: return NAME;
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#define ARM_ARCH_ALIAS(NAME, ID) /* empty */
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#include "ARMArchName.def"
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}
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return nullptr;
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}
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static const char *GetArchDefaultCPUName(unsigned ID) {
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switch (ID) {
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default:
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llvm_unreachable("Unknown ARCH kind");
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break;
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#define ARM_ARCH_NAME(NAME, ID, DEFAULT_CPU_NAME, DEFAULT_CPU_ARCH) \
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case ARM::ID: return DEFAULT_CPU_NAME;
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#define ARM_ARCH_ALIAS(NAME, ID) /* empty */
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#include "ARMArchName.def"
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}
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return nullptr;
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}
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static unsigned GetArchDefaultCPUArch(unsigned ID) {
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switch (ID) {
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default:
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llvm_unreachable("Unknown ARCH kind");
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break;
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#define ARM_ARCH_NAME(NAME, ID, DEFAULT_CPU_NAME, DEFAULT_CPU_ARCH) \
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case ARM::ID: return ARMBuildAttrs::DEFAULT_CPU_ARCH;
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#define ARM_ARCH_ALIAS(NAME, ID) /* empty */
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#include "ARMArchName.def"
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}
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return 0;
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}
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namespace {
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class ARMELFStreamer;
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class ARMTargetAsmStreamer : public ARMTargetStreamer {
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formatted_raw_ostream &OS;
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MCInstPrinter &InstPrinter;
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bool IsVerboseAsm;
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void emitFnStart() override;
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void emitFnEnd() override;
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void emitCantUnwind() override;
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void emitPersonality(const MCSymbol *Personality) override;
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void emitPersonalityIndex(unsigned Index) override;
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void emitHandlerData() override;
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void emitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset = 0) override;
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void emitMovSP(unsigned Reg, int64_t Offset = 0) override;
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void emitPad(int64_t Offset) override;
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void emitRegSave(const SmallVectorImpl<unsigned> &RegList,
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bool isVector) override;
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void emitUnwindRaw(int64_t Offset,
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const SmallVectorImpl<uint8_t> &Opcodes) override;
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void switchVendor(StringRef Vendor) override;
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void emitAttribute(unsigned Attribute, unsigned Value) override;
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void emitTextAttribute(unsigned Attribute, StringRef String) override;
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void emitIntTextAttribute(unsigned Attribute, unsigned IntValue,
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StringRef StrinValue) override;
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void emitArch(unsigned Arch) override;
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void emitObjectArch(unsigned Arch) override;
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void emitFPU(unsigned FPU) override;
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void emitInst(uint32_t Inst, char Suffix = '\0') override;
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void finishAttributeSection() override;
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void AnnotateTLSDescriptorSequence(const MCSymbolRefExpr *SRE) override;
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void emitThumbSet(MCSymbol *Symbol, const MCExpr *Value) override;
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public:
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ARMTargetAsmStreamer(MCStreamer &S, formatted_raw_ostream &OS,
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MCInstPrinter &InstPrinter, bool VerboseAsm);
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};
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ARMTargetAsmStreamer::ARMTargetAsmStreamer(MCStreamer &S,
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formatted_raw_ostream &OS,
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MCInstPrinter &InstPrinter,
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bool VerboseAsm)
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: ARMTargetStreamer(S), OS(OS), InstPrinter(InstPrinter),
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IsVerboseAsm(VerboseAsm) {}
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void ARMTargetAsmStreamer::emitFnStart() { OS << "\t.fnstart\n"; }
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void ARMTargetAsmStreamer::emitFnEnd() { OS << "\t.fnend\n"; }
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void ARMTargetAsmStreamer::emitCantUnwind() { OS << "\t.cantunwind\n"; }
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void ARMTargetAsmStreamer::emitPersonality(const MCSymbol *Personality) {
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OS << "\t.personality " << Personality->getName() << '\n';
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}
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void ARMTargetAsmStreamer::emitPersonalityIndex(unsigned Index) {
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OS << "\t.personalityindex " << Index << '\n';
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}
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void ARMTargetAsmStreamer::emitHandlerData() { OS << "\t.handlerdata\n"; }
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void ARMTargetAsmStreamer::emitSetFP(unsigned FpReg, unsigned SpReg,
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int64_t Offset) {
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OS << "\t.setfp\t";
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InstPrinter.printRegName(OS, FpReg);
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OS << ", ";
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InstPrinter.printRegName(OS, SpReg);
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if (Offset)
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OS << ", #" << Offset;
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OS << '\n';
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}
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void ARMTargetAsmStreamer::emitMovSP(unsigned Reg, int64_t Offset) {
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assert((Reg != ARM::SP && Reg != ARM::PC) &&
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"the operand of .movsp cannot be either sp or pc");
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OS << "\t.movsp\t";
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InstPrinter.printRegName(OS, Reg);
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if (Offset)
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OS << ", #" << Offset;
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OS << '\n';
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}
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void ARMTargetAsmStreamer::emitPad(int64_t Offset) {
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OS << "\t.pad\t#" << Offset << '\n';
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}
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void ARMTargetAsmStreamer::emitRegSave(const SmallVectorImpl<unsigned> &RegList,
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bool isVector) {
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assert(RegList.size() && "RegList should not be empty");
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if (isVector)
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OS << "\t.vsave\t{";
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else
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OS << "\t.save\t{";
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InstPrinter.printRegName(OS, RegList[0]);
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for (unsigned i = 1, e = RegList.size(); i != e; ++i) {
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OS << ", ";
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InstPrinter.printRegName(OS, RegList[i]);
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}
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OS << "}\n";
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}
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void ARMTargetAsmStreamer::switchVendor(StringRef Vendor) {
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}
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void ARMTargetAsmStreamer::emitAttribute(unsigned Attribute, unsigned Value) {
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OS << "\t.eabi_attribute\t" << Attribute << ", " << Twine(Value);
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if (IsVerboseAsm) {
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StringRef Name = ARMBuildAttrs::AttrTypeAsString(Attribute);
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if (!Name.empty())
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OS << "\t@ " << Name;
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}
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OS << "\n";
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}
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void ARMTargetAsmStreamer::emitTextAttribute(unsigned Attribute,
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StringRef String) {
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switch (Attribute) {
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case ARMBuildAttrs::CPU_name:
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OS << "\t.cpu\t" << String.lower();
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break;
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default:
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OS << "\t.eabi_attribute\t" << Attribute << ", \"" << String << "\"";
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if (IsVerboseAsm) {
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StringRef Name = ARMBuildAttrs::AttrTypeAsString(Attribute);
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if (!Name.empty())
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OS << "\t@ " << Name;
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}
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break;
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}
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OS << "\n";
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}
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void ARMTargetAsmStreamer::emitIntTextAttribute(unsigned Attribute,
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unsigned IntValue,
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StringRef StringValue) {
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switch (Attribute) {
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default: llvm_unreachable("unsupported multi-value attribute in asm mode");
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case ARMBuildAttrs::compatibility:
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OS << "\t.eabi_attribute\t" << Attribute << ", " << IntValue;
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if (!StringValue.empty())
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OS << ", \"" << StringValue << "\"";
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if (IsVerboseAsm)
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OS << "\t@ " << ARMBuildAttrs::AttrTypeAsString(Attribute);
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break;
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}
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OS << "\n";
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}
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void ARMTargetAsmStreamer::emitArch(unsigned Arch) {
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OS << "\t.arch\t" << GetArchName(Arch) << "\n";
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}
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void ARMTargetAsmStreamer::emitObjectArch(unsigned Arch) {
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OS << "\t.object_arch\t" << GetArchName(Arch) << '\n';
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}
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void ARMTargetAsmStreamer::emitFPU(unsigned FPU) {
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OS << "\t.fpu\t" << GetFPUName(FPU) << "\n";
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}
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void ARMTargetAsmStreamer::finishAttributeSection() {
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}
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void
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ARMTargetAsmStreamer::AnnotateTLSDescriptorSequence(const MCSymbolRefExpr *S) {
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OS << "\t.tlsdescseq\t" << S->getSymbol().getName();
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}
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void ARMTargetAsmStreamer::emitThumbSet(MCSymbol *Symbol, const MCExpr *Value) {
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OS << "\t.thumb_set\t" << *Symbol << ", " << *Value << '\n';
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}
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void ARMTargetAsmStreamer::emitInst(uint32_t Inst, char Suffix) {
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OS << "\t.inst";
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if (Suffix)
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OS << "." << Suffix;
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OS << "\t0x" << utohexstr(Inst) << "\n";
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}
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void ARMTargetAsmStreamer::emitUnwindRaw(int64_t Offset,
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const SmallVectorImpl<uint8_t> &Opcodes) {
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OS << "\t.unwind_raw " << Offset;
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for (SmallVectorImpl<uint8_t>::const_iterator OCI = Opcodes.begin(),
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OCE = Opcodes.end();
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OCI != OCE; ++OCI)
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OS << ", 0x" << utohexstr(*OCI);
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OS << '\n';
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}
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class ARMTargetELFStreamer : public ARMTargetStreamer {
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private:
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// This structure holds all attributes, accounting for
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// their string/numeric value, so we can later emmit them
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// in declaration order, keeping all in the same vector
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struct AttributeItem {
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enum {
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HiddenAttribute = 0,
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NumericAttribute,
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TextAttribute,
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NumericAndTextAttributes
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} Type;
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unsigned Tag;
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unsigned IntValue;
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StringRef StringValue;
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static bool LessTag(const AttributeItem &LHS, const AttributeItem &RHS) {
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// The conformance tag must be emitted first when serialised
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// into an object file. Specifically, the addenda to the ARM ABI
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// states that (2.3.7.4):
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//
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// "To simplify recognition by consumers in the common case of
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// claiming conformity for the whole file, this tag should be
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// emitted first in a file-scope sub-subsection of the first
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// public subsection of the attributes section."
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//
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// So it is special-cased in this comparison predicate when the
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// attributes are sorted in finishAttributeSection().
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return (RHS.Tag != ARMBuildAttrs::conformance) &&
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((LHS.Tag == ARMBuildAttrs::conformance) || (LHS.Tag < RHS.Tag));
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}
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};
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StringRef CurrentVendor;
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unsigned FPU;
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unsigned Arch;
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unsigned EmittedArch;
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SmallVector<AttributeItem, 64> Contents;
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const MCSection *AttributeSection;
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AttributeItem *getAttributeItem(unsigned Attribute) {
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for (size_t i = 0; i < Contents.size(); ++i)
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if (Contents[i].Tag == Attribute)
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return &Contents[i];
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return nullptr;
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}
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void setAttributeItem(unsigned Attribute, unsigned Value,
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bool OverwriteExisting) {
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// Look for existing attribute item
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if (AttributeItem *Item = getAttributeItem(Attribute)) {
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if (!OverwriteExisting)
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return;
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Item->Type = AttributeItem::NumericAttribute;
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Item->IntValue = Value;
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return;
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}
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// Create new attribute item
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AttributeItem Item = {
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AttributeItem::NumericAttribute,
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Attribute,
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Value,
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StringRef("")
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};
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Contents.push_back(Item);
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}
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void setAttributeItem(unsigned Attribute, StringRef Value,
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bool OverwriteExisting) {
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// Look for existing attribute item
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if (AttributeItem *Item = getAttributeItem(Attribute)) {
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if (!OverwriteExisting)
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return;
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Item->Type = AttributeItem::TextAttribute;
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Item->StringValue = Value;
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return;
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}
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// Create new attribute item
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AttributeItem Item = {
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AttributeItem::TextAttribute,
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Attribute,
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0,
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Value
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};
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Contents.push_back(Item);
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}
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void setAttributeItems(unsigned Attribute, unsigned IntValue,
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StringRef StringValue, bool OverwriteExisting) {
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// Look for existing attribute item
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if (AttributeItem *Item = getAttributeItem(Attribute)) {
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if (!OverwriteExisting)
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return;
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Item->Type = AttributeItem::NumericAndTextAttributes;
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Item->IntValue = IntValue;
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Item->StringValue = StringValue;
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return;
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}
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// Create new attribute item
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AttributeItem Item = {
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AttributeItem::NumericAndTextAttributes,
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Attribute,
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IntValue,
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StringValue
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};
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Contents.push_back(Item);
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}
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void emitArchDefaultAttributes();
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void emitFPUDefaultAttributes();
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ARMELFStreamer &getStreamer();
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void emitFnStart() override;
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void emitFnEnd() override;
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void emitCantUnwind() override;
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void emitPersonality(const MCSymbol *Personality) override;
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void emitPersonalityIndex(unsigned Index) override;
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void emitHandlerData() override;
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void emitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset = 0) override;
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void emitMovSP(unsigned Reg, int64_t Offset = 0) override;
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void emitPad(int64_t Offset) override;
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void emitRegSave(const SmallVectorImpl<unsigned> &RegList,
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bool isVector) override;
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void emitUnwindRaw(int64_t Offset,
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const SmallVectorImpl<uint8_t> &Opcodes) override;
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void switchVendor(StringRef Vendor) override;
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void emitAttribute(unsigned Attribute, unsigned Value) override;
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void emitTextAttribute(unsigned Attribute, StringRef String) override;
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void emitIntTextAttribute(unsigned Attribute, unsigned IntValue,
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StringRef StringValue) override;
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void emitArch(unsigned Arch) override;
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void emitObjectArch(unsigned Arch) override;
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void emitFPU(unsigned FPU) override;
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void emitInst(uint32_t Inst, char Suffix = '\0') override;
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void finishAttributeSection() override;
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void emitLabel(MCSymbol *Symbol) override;
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void AnnotateTLSDescriptorSequence(const MCSymbolRefExpr *SRE) override;
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void emitThumbSet(MCSymbol *Symbol, const MCExpr *Value) override;
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size_t calculateContentSize() const;
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public:
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ARMTargetELFStreamer(MCStreamer &S)
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: ARMTargetStreamer(S), CurrentVendor("aeabi"), FPU(ARM::INVALID_FPU),
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Arch(ARM::INVALID_ARCH), EmittedArch(ARM::INVALID_ARCH),
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AttributeSection(nullptr) {}
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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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/// ARM ELF ABI: infocenter.arm.com/help/topic/com.arm.../IHI0044D_aaelf.pdf.
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///
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/// In brief: $a, $t or $d should be emitted at the start of each contiguous
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/// region of ARM code, Thumb code or data in a section. In practice, this
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/// emission does not rely on explicit assembler directives but on inherent
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/// properties of the directives doing the emission (e.g. ".byte" is data, "add
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/// r0, r0, r0" an 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 ARMELFStreamer : public MCELFStreamer {
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public:
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friend class ARMTargetELFStreamer;
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ARMELFStreamer(MCContext &Context, MCAsmBackend &TAB, raw_ostream &OS,
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MCCodeEmitter *Emitter, bool IsThumb)
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: MCELFStreamer(Context, TAB, OS, Emitter), IsThumb(IsThumb),
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MappingSymbolCounter(0), LastEMS(EMS_None) {
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Reset();
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}
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~ARMELFStreamer() {}
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void FinishImpl() override;
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// ARM exception handling directives
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void emitFnStart();
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void emitFnEnd();
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void emitCantUnwind();
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void emitPersonality(const MCSymbol *Per);
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void emitPersonalityIndex(unsigned index);
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void emitHandlerData();
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void emitSetFP(unsigned NewFpReg, unsigned NewSpReg, int64_t Offset = 0);
|
|
void emitMovSP(unsigned Reg, int64_t Offset = 0);
|
|
void emitPad(int64_t Offset);
|
|
void emitRegSave(const SmallVectorImpl<unsigned> &RegList, bool isVector);
|
|
void emitUnwindRaw(int64_t Offset, const SmallVectorImpl<uint8_t> &Opcodes);
|
|
|
|
void ChangeSection(const MCSection *Section,
|
|
const MCExpr *Subsection) override {
|
|
// We have to keep track of the mapping symbol state of any sections we
|
|
// use. Each one should start off as EMS_None, which is provided as the
|
|
// default constructor by DenseMap::lookup.
|
|
LastMappingSymbols[getPreviousSection().first] = LastEMS;
|
|
LastEMS = LastMappingSymbols.lookup(Section);
|
|
|
|
MCELFStreamer::ChangeSection(Section, Subsection);
|
|
}
|
|
|
|
/// This function is the one used to emit instruction data into the ELF
|
|
/// streamer. We override it to add the appropriate mapping symbol if
|
|
/// necessary.
|
|
void EmitInstruction(const MCInst& Inst,
|
|
const MCSubtargetInfo &STI) override {
|
|
if (IsThumb)
|
|
EmitThumbMappingSymbol();
|
|
else
|
|
EmitARMMappingSymbol();
|
|
|
|
MCELFStreamer::EmitInstruction(Inst, STI);
|
|
}
|
|
|
|
void emitInst(uint32_t Inst, char Suffix) {
|
|
unsigned Size;
|
|
char Buffer[4];
|
|
const bool LittleEndian = getContext().getAsmInfo()->isLittleEndian();
|
|
|
|
switch (Suffix) {
|
|
case '\0':
|
|
Size = 4;
|
|
|
|
assert(!IsThumb);
|
|
EmitARMMappingSymbol();
|
|
for (unsigned II = 0, IE = Size; II != IE; II++) {
|
|
const unsigned I = LittleEndian ? (Size - II - 1) : II;
|
|
Buffer[Size - II - 1] = uint8_t(Inst >> I * CHAR_BIT);
|
|
}
|
|
|
|
break;
|
|
case 'n':
|
|
case 'w':
|
|
Size = (Suffix == 'n' ? 2 : 4);
|
|
|
|
assert(IsThumb);
|
|
EmitThumbMappingSymbol();
|
|
for (unsigned II = 0, IE = Size; II != IE; II = II + 2) {
|
|
const unsigned I0 = LittleEndian ? II + 0 : (Size - II - 1);
|
|
const unsigned I1 = LittleEndian ? II + 1 : (Size - II - 2);
|
|
Buffer[Size - II - 2] = uint8_t(Inst >> I0 * CHAR_BIT);
|
|
Buffer[Size - II - 1] = uint8_t(Inst >> I1 * CHAR_BIT);
|
|
}
|
|
|
|
break;
|
|
default:
|
|
llvm_unreachable("Invalid Suffix");
|
|
}
|
|
|
|
MCELFStreamer::EmitBytes(StringRef(Buffer, Size));
|
|
}
|
|
|
|
/// This is one of the functions used to emit data into an ELF section, so the
|
|
/// ARM streamer overrides it to add the appropriate mapping symbol ($d) if
|
|
/// necessary.
|
|
void EmitBytes(StringRef Data) override {
|
|
EmitDataMappingSymbol();
|
|
MCELFStreamer::EmitBytes(Data);
|
|
}
|
|
|
|
/// This is one of the functions used to emit data into an ELF section, so the
|
|
/// ARM streamer overrides it to add the appropriate mapping symbol ($d) if
|
|
/// necessary.
|
|
void EmitValueImpl(const MCExpr *Value, unsigned Size,
|
|
const SMLoc &Loc) override {
|
|
if (const MCSymbolRefExpr *SRE = dyn_cast_or_null<MCSymbolRefExpr>(Value))
|
|
if (SRE->getKind() == MCSymbolRefExpr::VK_ARM_SBREL && !(Size == 4))
|
|
getContext().FatalError(Loc, "relocated expression must be 32-bit");
|
|
|
|
EmitDataMappingSymbol();
|
|
MCELFStreamer::EmitValueImpl(Value, Size);
|
|
}
|
|
|
|
void EmitAssemblerFlag(MCAssemblerFlag Flag) override {
|
|
MCELFStreamer::EmitAssemblerFlag(Flag);
|
|
|
|
switch (Flag) {
|
|
case MCAF_SyntaxUnified:
|
|
return; // no-op here.
|
|
case MCAF_Code16:
|
|
IsThumb = true;
|
|
return; // Change to Thumb mode
|
|
case MCAF_Code32:
|
|
IsThumb = false;
|
|
return; // Change to ARM mode
|
|
case MCAF_Code64:
|
|
return;
|
|
case MCAF_SubsectionsViaSymbols:
|
|
return;
|
|
}
|
|
}
|
|
|
|
private:
|
|
enum ElfMappingSymbol {
|
|
EMS_None,
|
|
EMS_ARM,
|
|
EMS_Thumb,
|
|
EMS_Data
|
|
};
|
|
|
|
void EmitDataMappingSymbol() {
|
|
if (LastEMS == EMS_Data) return;
|
|
EmitMappingSymbol("$d");
|
|
LastEMS = EMS_Data;
|
|
}
|
|
|
|
void EmitThumbMappingSymbol() {
|
|
if (LastEMS == EMS_Thumb) return;
|
|
EmitMappingSymbol("$t");
|
|
LastEMS = EMS_Thumb;
|
|
}
|
|
|
|
void EmitARMMappingSymbol() {
|
|
if (LastEMS == EMS_ARM) return;
|
|
EmitMappingSymbol("$a");
|
|
LastEMS = EMS_ARM;
|
|
}
|
|
|
|
void EmitMappingSymbol(StringRef Name) {
|
|
MCSymbol *Start = getContext().CreateTempSymbol();
|
|
EmitLabel(Start);
|
|
|
|
MCSymbol *Symbol =
|
|
getContext().GetOrCreateSymbol(Name + "." +
|
|
Twine(MappingSymbolCounter++));
|
|
|
|
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
|
|
MCELF::SetType(SD, ELF::STT_NOTYPE);
|
|
MCELF::SetBinding(SD, ELF::STB_LOCAL);
|
|
SD.setExternal(false);
|
|
AssignSection(Symbol, getCurrentSection().first);
|
|
|
|
const MCExpr *Value = MCSymbolRefExpr::Create(Start, getContext());
|
|
Symbol->setVariableValue(Value);
|
|
}
|
|
|
|
void EmitThumbFunc(MCSymbol *Func) override {
|
|
getAssembler().setIsThumbFunc(Func);
|
|
EmitSymbolAttribute(Func, MCSA_ELF_TypeFunction);
|
|
}
|
|
|
|
// Helper functions for ARM exception handling directives
|
|
void Reset();
|
|
|
|
void EmitPersonalityFixup(StringRef Name);
|
|
void FlushPendingOffset();
|
|
void FlushUnwindOpcodes(bool NoHandlerData);
|
|
|
|
void SwitchToEHSection(const char *Prefix, unsigned Type, unsigned Flags,
|
|
SectionKind Kind, const MCSymbol &Fn);
|
|
void SwitchToExTabSection(const MCSymbol &FnStart);
|
|
void SwitchToExIdxSection(const MCSymbol &FnStart);
|
|
|
|
void EmitFixup(const MCExpr *Expr, MCFixupKind Kind);
|
|
|
|
bool IsThumb;
|
|
int64_t MappingSymbolCounter;
|
|
|
|
DenseMap<const MCSection *, ElfMappingSymbol> LastMappingSymbols;
|
|
ElfMappingSymbol LastEMS;
|
|
|
|
// ARM Exception Handling Frame Information
|
|
MCSymbol *ExTab;
|
|
MCSymbol *FnStart;
|
|
const MCSymbol *Personality;
|
|
unsigned PersonalityIndex;
|
|
unsigned FPReg; // Frame pointer register
|
|
int64_t FPOffset; // Offset: (final frame pointer) - (initial $sp)
|
|
int64_t SPOffset; // Offset: (final $sp) - (initial $sp)
|
|
int64_t PendingOffset; // Offset: (final $sp) - (emitted $sp)
|
|
bool UsedFP;
|
|
bool CantUnwind;
|
|
SmallVector<uint8_t, 64> Opcodes;
|
|
UnwindOpcodeAssembler UnwindOpAsm;
|
|
};
|
|
} // end anonymous namespace
|
|
|
|
ARMELFStreamer &ARMTargetELFStreamer::getStreamer() {
|
|
return static_cast<ARMELFStreamer &>(Streamer);
|
|
}
|
|
|
|
void ARMTargetELFStreamer::emitFnStart() { getStreamer().emitFnStart(); }
|
|
void ARMTargetELFStreamer::emitFnEnd() { getStreamer().emitFnEnd(); }
|
|
void ARMTargetELFStreamer::emitCantUnwind() { getStreamer().emitCantUnwind(); }
|
|
void ARMTargetELFStreamer::emitPersonality(const MCSymbol *Personality) {
|
|
getStreamer().emitPersonality(Personality);
|
|
}
|
|
void ARMTargetELFStreamer::emitPersonalityIndex(unsigned Index) {
|
|
getStreamer().emitPersonalityIndex(Index);
|
|
}
|
|
void ARMTargetELFStreamer::emitHandlerData() {
|
|
getStreamer().emitHandlerData();
|
|
}
|
|
void ARMTargetELFStreamer::emitSetFP(unsigned FpReg, unsigned SpReg,
|
|
int64_t Offset) {
|
|
getStreamer().emitSetFP(FpReg, SpReg, Offset);
|
|
}
|
|
void ARMTargetELFStreamer::emitMovSP(unsigned Reg, int64_t Offset) {
|
|
getStreamer().emitMovSP(Reg, Offset);
|
|
}
|
|
void ARMTargetELFStreamer::emitPad(int64_t Offset) {
|
|
getStreamer().emitPad(Offset);
|
|
}
|
|
void ARMTargetELFStreamer::emitRegSave(const SmallVectorImpl<unsigned> &RegList,
|
|
bool isVector) {
|
|
getStreamer().emitRegSave(RegList, isVector);
|
|
}
|
|
void ARMTargetELFStreamer::emitUnwindRaw(int64_t Offset,
|
|
const SmallVectorImpl<uint8_t> &Opcodes) {
|
|
getStreamer().emitUnwindRaw(Offset, Opcodes);
|
|
}
|
|
void ARMTargetELFStreamer::switchVendor(StringRef Vendor) {
|
|
assert(!Vendor.empty() && "Vendor cannot be empty.");
|
|
|
|
if (CurrentVendor == Vendor)
|
|
return;
|
|
|
|
if (!CurrentVendor.empty())
|
|
finishAttributeSection();
|
|
|
|
assert(Contents.empty() &&
|
|
".ARM.attributes should be flushed before changing vendor");
|
|
CurrentVendor = Vendor;
|
|
|
|
}
|
|
void ARMTargetELFStreamer::emitAttribute(unsigned Attribute, unsigned Value) {
|
|
setAttributeItem(Attribute, Value, /* OverwriteExisting= */ true);
|
|
}
|
|
void ARMTargetELFStreamer::emitTextAttribute(unsigned Attribute,
|
|
StringRef Value) {
|
|
setAttributeItem(Attribute, Value, /* OverwriteExisting= */ true);
|
|
}
|
|
void ARMTargetELFStreamer::emitIntTextAttribute(unsigned Attribute,
|
|
unsigned IntValue,
|
|
StringRef StringValue) {
|
|
setAttributeItems(Attribute, IntValue, StringValue,
|
|
/* OverwriteExisting= */ true);
|
|
}
|
|
void ARMTargetELFStreamer::emitArch(unsigned Value) {
|
|
Arch = Value;
|
|
}
|
|
void ARMTargetELFStreamer::emitObjectArch(unsigned Value) {
|
|
EmittedArch = Value;
|
|
}
|
|
void ARMTargetELFStreamer::emitArchDefaultAttributes() {
|
|
using namespace ARMBuildAttrs;
|
|
|
|
setAttributeItem(CPU_name, GetArchDefaultCPUName(Arch), false);
|
|
if (EmittedArch == ARM::INVALID_ARCH)
|
|
setAttributeItem(CPU_arch, GetArchDefaultCPUArch(Arch), false);
|
|
else
|
|
setAttributeItem(CPU_arch, GetArchDefaultCPUArch(EmittedArch), false);
|
|
|
|
switch (Arch) {
|
|
case ARM::ARMV2:
|
|
case ARM::ARMV2A:
|
|
case ARM::ARMV3:
|
|
case ARM::ARMV3M:
|
|
case ARM::ARMV4:
|
|
case ARM::ARMV5:
|
|
setAttributeItem(ARM_ISA_use, Allowed, false);
|
|
break;
|
|
|
|
case ARM::ARMV4T:
|
|
case ARM::ARMV5T:
|
|
case ARM::ARMV5TE:
|
|
case ARM::ARMV6:
|
|
case ARM::ARMV6J:
|
|
setAttributeItem(ARM_ISA_use, Allowed, false);
|
|
setAttributeItem(THUMB_ISA_use, Allowed, false);
|
|
break;
|
|
|
|
case ARM::ARMV6T2:
|
|
setAttributeItem(ARM_ISA_use, Allowed, false);
|
|
setAttributeItem(THUMB_ISA_use, AllowThumb32, false);
|
|
break;
|
|
|
|
case ARM::ARMV6Z:
|
|
case ARM::ARMV6ZK:
|
|
setAttributeItem(ARM_ISA_use, Allowed, false);
|
|
setAttributeItem(THUMB_ISA_use, Allowed, false);
|
|
setAttributeItem(Virtualization_use, AllowTZ, false);
|
|
break;
|
|
|
|
case ARM::ARMV6M:
|
|
setAttributeItem(THUMB_ISA_use, Allowed, false);
|
|
break;
|
|
|
|
case ARM::ARMV7:
|
|
setAttributeItem(THUMB_ISA_use, AllowThumb32, false);
|
|
break;
|
|
|
|
case ARM::ARMV7A:
|
|
setAttributeItem(CPU_arch_profile, ApplicationProfile, false);
|
|
setAttributeItem(ARM_ISA_use, Allowed, false);
|
|
setAttributeItem(THUMB_ISA_use, AllowThumb32, false);
|
|
break;
|
|
|
|
case ARM::ARMV7R:
|
|
setAttributeItem(CPU_arch_profile, RealTimeProfile, false);
|
|
setAttributeItem(ARM_ISA_use, Allowed, false);
|
|
setAttributeItem(THUMB_ISA_use, AllowThumb32, false);
|
|
break;
|
|
|
|
case ARM::ARMV7M:
|
|
setAttributeItem(CPU_arch_profile, MicroControllerProfile, false);
|
|
setAttributeItem(THUMB_ISA_use, AllowThumb32, false);
|
|
break;
|
|
|
|
case ARM::ARMV8A:
|
|
setAttributeItem(CPU_arch_profile, ApplicationProfile, false);
|
|
setAttributeItem(ARM_ISA_use, Allowed, false);
|
|
setAttributeItem(THUMB_ISA_use, AllowThumb32, false);
|
|
setAttributeItem(MPextension_use, Allowed, false);
|
|
setAttributeItem(Virtualization_use, AllowTZVirtualization, false);
|
|
break;
|
|
|
|
case ARM::IWMMXT:
|
|
setAttributeItem(ARM_ISA_use, Allowed, false);
|
|
setAttributeItem(THUMB_ISA_use, Allowed, false);
|
|
setAttributeItem(WMMX_arch, AllowWMMXv1, false);
|
|
break;
|
|
|
|
case ARM::IWMMXT2:
|
|
setAttributeItem(ARM_ISA_use, Allowed, false);
|
|
setAttributeItem(THUMB_ISA_use, Allowed, false);
|
|
setAttributeItem(WMMX_arch, AllowWMMXv2, false);
|
|
break;
|
|
|
|
default:
|
|
report_fatal_error("Unknown Arch: " + Twine(Arch));
|
|
break;
|
|
}
|
|
}
|
|
void ARMTargetELFStreamer::emitFPU(unsigned Value) {
|
|
FPU = Value;
|
|
}
|
|
void ARMTargetELFStreamer::emitFPUDefaultAttributes() {
|
|
switch (FPU) {
|
|
case ARM::VFP:
|
|
case ARM::VFPV2:
|
|
setAttributeItem(ARMBuildAttrs::FP_arch,
|
|
ARMBuildAttrs::AllowFPv2,
|
|
/* OverwriteExisting= */ false);
|
|
break;
|
|
|
|
case ARM::VFPV3:
|
|
setAttributeItem(ARMBuildAttrs::FP_arch,
|
|
ARMBuildAttrs::AllowFPv3A,
|
|
/* OverwriteExisting= */ false);
|
|
break;
|
|
|
|
case ARM::VFPV3_D16:
|
|
setAttributeItem(ARMBuildAttrs::FP_arch,
|
|
ARMBuildAttrs::AllowFPv3B,
|
|
/* OverwriteExisting= */ false);
|
|
break;
|
|
|
|
case ARM::VFPV4:
|
|
setAttributeItem(ARMBuildAttrs::FP_arch,
|
|
ARMBuildAttrs::AllowFPv4A,
|
|
/* OverwriteExisting= */ false);
|
|
break;
|
|
|
|
case ARM::VFPV4_D16:
|
|
setAttributeItem(ARMBuildAttrs::FP_arch,
|
|
ARMBuildAttrs::AllowFPv4B,
|
|
/* OverwriteExisting= */ false);
|
|
break;
|
|
|
|
case ARM::FP_ARMV8:
|
|
setAttributeItem(ARMBuildAttrs::FP_arch,
|
|
ARMBuildAttrs::AllowFPARMv8A,
|
|
/* OverwriteExisting= */ false);
|
|
break;
|
|
|
|
// FPV5_D16 is identical to FP_ARMV8 except for the number of D registers, so
|
|
// uses the FP_ARMV8_D16 build attribute.
|
|
case ARM::FPV5_D16:
|
|
setAttributeItem(ARMBuildAttrs::FP_arch,
|
|
ARMBuildAttrs::AllowFPARMv8B,
|
|
/* OverwriteExisting= */ false);
|
|
break;
|
|
|
|
case ARM::NEON:
|
|
setAttributeItem(ARMBuildAttrs::FP_arch,
|
|
ARMBuildAttrs::AllowFPv3A,
|
|
/* OverwriteExisting= */ false);
|
|
setAttributeItem(ARMBuildAttrs::Advanced_SIMD_arch,
|
|
ARMBuildAttrs::AllowNeon,
|
|
/* OverwriteExisting= */ false);
|
|
break;
|
|
|
|
case ARM::NEON_VFPV4:
|
|
setAttributeItem(ARMBuildAttrs::FP_arch,
|
|
ARMBuildAttrs::AllowFPv4A,
|
|
/* OverwriteExisting= */ false);
|
|
setAttributeItem(ARMBuildAttrs::Advanced_SIMD_arch,
|
|
ARMBuildAttrs::AllowNeon2,
|
|
/* OverwriteExisting= */ false);
|
|
break;
|
|
|
|
case ARM::NEON_FP_ARMV8:
|
|
case ARM::CRYPTO_NEON_FP_ARMV8:
|
|
setAttributeItem(ARMBuildAttrs::FP_arch,
|
|
ARMBuildAttrs::AllowFPARMv8A,
|
|
/* OverwriteExisting= */ false);
|
|
setAttributeItem(ARMBuildAttrs::Advanced_SIMD_arch,
|
|
ARMBuildAttrs::AllowNeonARMv8,
|
|
/* OverwriteExisting= */ false);
|
|
break;
|
|
|
|
case ARM::SOFTVFP:
|
|
break;
|
|
|
|
default:
|
|
report_fatal_error("Unknown FPU: " + Twine(FPU));
|
|
break;
|
|
}
|
|
}
|
|
size_t ARMTargetELFStreamer::calculateContentSize() const {
|
|
size_t Result = 0;
|
|
for (size_t i = 0; i < Contents.size(); ++i) {
|
|
AttributeItem item = Contents[i];
|
|
switch (item.Type) {
|
|
case AttributeItem::HiddenAttribute:
|
|
break;
|
|
case AttributeItem::NumericAttribute:
|
|
Result += getULEB128Size(item.Tag);
|
|
Result += getULEB128Size(item.IntValue);
|
|
break;
|
|
case AttributeItem::TextAttribute:
|
|
Result += getULEB128Size(item.Tag);
|
|
Result += item.StringValue.size() + 1; // string + '\0'
|
|
break;
|
|
case AttributeItem::NumericAndTextAttributes:
|
|
Result += getULEB128Size(item.Tag);
|
|
Result += getULEB128Size(item.IntValue);
|
|
Result += item.StringValue.size() + 1; // string + '\0';
|
|
break;
|
|
}
|
|
}
|
|
return Result;
|
|
}
|
|
void ARMTargetELFStreamer::finishAttributeSection() {
|
|
// <format-version>
|
|
// [ <section-length> "vendor-name"
|
|
// [ <file-tag> <size> <attribute>*
|
|
// | <section-tag> <size> <section-number>* 0 <attribute>*
|
|
// | <symbol-tag> <size> <symbol-number>* 0 <attribute>*
|
|
// ]+
|
|
// ]*
|
|
|
|
if (FPU != ARM::INVALID_FPU)
|
|
emitFPUDefaultAttributes();
|
|
|
|
if (Arch != ARM::INVALID_ARCH)
|
|
emitArchDefaultAttributes();
|
|
|
|
if (Contents.empty())
|
|
return;
|
|
|
|
std::sort(Contents.begin(), Contents.end(), AttributeItem::LessTag);
|
|
|
|
ARMELFStreamer &Streamer = getStreamer();
|
|
|
|
// Switch to .ARM.attributes section
|
|
if (AttributeSection) {
|
|
Streamer.SwitchSection(AttributeSection);
|
|
} else {
|
|
AttributeSection = Streamer.getContext().getELFSection(
|
|
".ARM.attributes", ELF::SHT_ARM_ATTRIBUTES, 0);
|
|
Streamer.SwitchSection(AttributeSection);
|
|
|
|
// Format version
|
|
Streamer.EmitIntValue(0x41, 1);
|
|
}
|
|
|
|
// Vendor size + Vendor name + '\0'
|
|
const size_t VendorHeaderSize = 4 + CurrentVendor.size() + 1;
|
|
|
|
// Tag + Tag Size
|
|
const size_t TagHeaderSize = 1 + 4;
|
|
|
|
const size_t ContentsSize = calculateContentSize();
|
|
|
|
Streamer.EmitIntValue(VendorHeaderSize + TagHeaderSize + ContentsSize, 4);
|
|
Streamer.EmitBytes(CurrentVendor);
|
|
Streamer.EmitIntValue(0, 1); // '\0'
|
|
|
|
Streamer.EmitIntValue(ARMBuildAttrs::File, 1);
|
|
Streamer.EmitIntValue(TagHeaderSize + ContentsSize, 4);
|
|
|
|
// Size should have been accounted for already, now
|
|
// emit each field as its type (ULEB or String)
|
|
for (size_t i = 0; i < Contents.size(); ++i) {
|
|
AttributeItem item = Contents[i];
|
|
Streamer.EmitULEB128IntValue(item.Tag);
|
|
switch (item.Type) {
|
|
default: llvm_unreachable("Invalid attribute type");
|
|
case AttributeItem::NumericAttribute:
|
|
Streamer.EmitULEB128IntValue(item.IntValue);
|
|
break;
|
|
case AttributeItem::TextAttribute:
|
|
Streamer.EmitBytes(item.StringValue);
|
|
Streamer.EmitIntValue(0, 1); // '\0'
|
|
break;
|
|
case AttributeItem::NumericAndTextAttributes:
|
|
Streamer.EmitULEB128IntValue(item.IntValue);
|
|
Streamer.EmitBytes(item.StringValue);
|
|
Streamer.EmitIntValue(0, 1); // '\0'
|
|
break;
|
|
}
|
|
}
|
|
|
|
Contents.clear();
|
|
FPU = ARM::INVALID_FPU;
|
|
}
|
|
|
|
void ARMTargetELFStreamer::emitLabel(MCSymbol *Symbol) {
|
|
ARMELFStreamer &Streamer = getStreamer();
|
|
if (!Streamer.IsThumb)
|
|
return;
|
|
|
|
const MCSymbolData &SD = Streamer.getOrCreateSymbolData(Symbol);
|
|
unsigned Type = MCELF::GetType(SD);
|
|
if (Type == ELF_STT_Func || Type == ELF_STT_GnuIFunc)
|
|
Streamer.EmitThumbFunc(Symbol);
|
|
}
|
|
|
|
void
|
|
ARMTargetELFStreamer::AnnotateTLSDescriptorSequence(const MCSymbolRefExpr *S) {
|
|
getStreamer().EmitFixup(S, FK_Data_4);
|
|
}
|
|
|
|
void ARMTargetELFStreamer::emitThumbSet(MCSymbol *Symbol, const MCExpr *Value) {
|
|
if (const MCSymbolRefExpr *SRE = dyn_cast<MCSymbolRefExpr>(Value)) {
|
|
const MCSymbol &Sym = SRE->getSymbol();
|
|
if (!Sym.isDefined()) {
|
|
getStreamer().EmitAssignment(Symbol, Value);
|
|
return;
|
|
}
|
|
}
|
|
|
|
getStreamer().EmitThumbFunc(Symbol);
|
|
getStreamer().EmitAssignment(Symbol, Value);
|
|
}
|
|
|
|
void ARMTargetELFStreamer::emitInst(uint32_t Inst, char Suffix) {
|
|
getStreamer().emitInst(Inst, Suffix);
|
|
}
|
|
|
|
void ARMELFStreamer::FinishImpl() {
|
|
MCTargetStreamer &TS = *getTargetStreamer();
|
|
ARMTargetStreamer &ATS = static_cast<ARMTargetStreamer &>(TS);
|
|
ATS.finishAttributeSection();
|
|
|
|
MCELFStreamer::FinishImpl();
|
|
}
|
|
|
|
inline void ARMELFStreamer::SwitchToEHSection(const char *Prefix,
|
|
unsigned Type,
|
|
unsigned Flags,
|
|
SectionKind Kind,
|
|
const MCSymbol &Fn) {
|
|
const MCSectionELF &FnSection =
|
|
static_cast<const MCSectionELF &>(Fn.getSection());
|
|
|
|
// Create the name for new section
|
|
StringRef FnSecName(FnSection.getSectionName());
|
|
SmallString<128> EHSecName(Prefix);
|
|
if (FnSecName != ".text") {
|
|
EHSecName += FnSecName;
|
|
}
|
|
|
|
// Get .ARM.extab or .ARM.exidx section
|
|
const MCSectionELF *EHSection = nullptr;
|
|
if (const MCSymbol *Group = FnSection.getGroup()) {
|
|
EHSection =
|
|
getContext().getELFSection(EHSecName, Type, Flags | ELF::SHF_GROUP,
|
|
FnSection.getEntrySize(), Group->getName());
|
|
} else {
|
|
EHSection = getContext().getELFSection(EHSecName, Type, Flags);
|
|
}
|
|
assert(EHSection && "Failed to get the required EH section");
|
|
|
|
// Switch to .ARM.extab or .ARM.exidx section
|
|
SwitchSection(EHSection);
|
|
EmitCodeAlignment(4);
|
|
}
|
|
|
|
inline void ARMELFStreamer::SwitchToExTabSection(const MCSymbol &FnStart) {
|
|
SwitchToEHSection(".ARM.extab",
|
|
ELF::SHT_PROGBITS,
|
|
ELF::SHF_ALLOC,
|
|
SectionKind::getDataRel(),
|
|
FnStart);
|
|
}
|
|
|
|
inline void ARMELFStreamer::SwitchToExIdxSection(const MCSymbol &FnStart) {
|
|
SwitchToEHSection(".ARM.exidx",
|
|
ELF::SHT_ARM_EXIDX,
|
|
ELF::SHF_ALLOC | ELF::SHF_LINK_ORDER,
|
|
SectionKind::getDataRel(),
|
|
FnStart);
|
|
}
|
|
void ARMELFStreamer::EmitFixup(const MCExpr *Expr, MCFixupKind Kind) {
|
|
MCDataFragment *Frag = getOrCreateDataFragment();
|
|
Frag->getFixups().push_back(MCFixup::Create(Frag->getContents().size(), Expr,
|
|
Kind));
|
|
}
|
|
|
|
void ARMELFStreamer::Reset() {
|
|
ExTab = nullptr;
|
|
FnStart = nullptr;
|
|
Personality = nullptr;
|
|
PersonalityIndex = ARM::EHABI::NUM_PERSONALITY_INDEX;
|
|
FPReg = ARM::SP;
|
|
FPOffset = 0;
|
|
SPOffset = 0;
|
|
PendingOffset = 0;
|
|
UsedFP = false;
|
|
CantUnwind = false;
|
|
|
|
Opcodes.clear();
|
|
UnwindOpAsm.Reset();
|
|
}
|
|
|
|
void ARMELFStreamer::emitFnStart() {
|
|
assert(FnStart == nullptr);
|
|
FnStart = getContext().CreateTempSymbol();
|
|
EmitLabel(FnStart);
|
|
}
|
|
|
|
void ARMELFStreamer::emitFnEnd() {
|
|
assert(FnStart && ".fnstart must precedes .fnend");
|
|
|
|
// Emit unwind opcodes if there is no .handlerdata directive
|
|
if (!ExTab && !CantUnwind)
|
|
FlushUnwindOpcodes(true);
|
|
|
|
// Emit the exception index table entry
|
|
SwitchToExIdxSection(*FnStart);
|
|
|
|
if (PersonalityIndex < ARM::EHABI::NUM_PERSONALITY_INDEX)
|
|
EmitPersonalityFixup(GetAEABIUnwindPersonalityName(PersonalityIndex));
|
|
|
|
const MCSymbolRefExpr *FnStartRef =
|
|
MCSymbolRefExpr::Create(FnStart,
|
|
MCSymbolRefExpr::VK_ARM_PREL31,
|
|
getContext());
|
|
|
|
EmitValue(FnStartRef, 4);
|
|
|
|
if (CantUnwind) {
|
|
EmitIntValue(ARM::EHABI::EXIDX_CANTUNWIND, 4);
|
|
} else if (ExTab) {
|
|
// Emit a reference to the unwind opcodes in the ".ARM.extab" section.
|
|
const MCSymbolRefExpr *ExTabEntryRef =
|
|
MCSymbolRefExpr::Create(ExTab,
|
|
MCSymbolRefExpr::VK_ARM_PREL31,
|
|
getContext());
|
|
EmitValue(ExTabEntryRef, 4);
|
|
} else {
|
|
// For the __aeabi_unwind_cpp_pr0, we have to emit the unwind opcodes in
|
|
// the second word of exception index table entry. The size of the unwind
|
|
// opcodes should always be 4 bytes.
|
|
assert(PersonalityIndex == ARM::EHABI::AEABI_UNWIND_CPP_PR0 &&
|
|
"Compact model must use __aeabi_unwind_cpp_pr0 as personality");
|
|
assert(Opcodes.size() == 4u &&
|
|
"Unwind opcode size for __aeabi_unwind_cpp_pr0 must be equal to 4");
|
|
uint64_t Intval = Opcodes[0] |
|
|
Opcodes[1] << 8 |
|
|
Opcodes[2] << 16 |
|
|
Opcodes[3] << 24;
|
|
EmitIntValue(Intval, Opcodes.size());
|
|
}
|
|
|
|
// Switch to the section containing FnStart
|
|
SwitchSection(&FnStart->getSection());
|
|
|
|
// Clean exception handling frame information
|
|
Reset();
|
|
}
|
|
|
|
void ARMELFStreamer::emitCantUnwind() { CantUnwind = true; }
|
|
|
|
// Add the R_ARM_NONE fixup at the same position
|
|
void ARMELFStreamer::EmitPersonalityFixup(StringRef Name) {
|
|
const MCSymbol *PersonalitySym = getContext().GetOrCreateSymbol(Name);
|
|
|
|
const MCSymbolRefExpr *PersonalityRef = MCSymbolRefExpr::Create(
|
|
PersonalitySym, MCSymbolRefExpr::VK_ARM_NONE, getContext());
|
|
|
|
visitUsedExpr(*PersonalityRef);
|
|
MCDataFragment *DF = getOrCreateDataFragment();
|
|
DF->getFixups().push_back(MCFixup::Create(DF->getContents().size(),
|
|
PersonalityRef,
|
|
MCFixup::getKindForSize(4, false)));
|
|
}
|
|
|
|
void ARMELFStreamer::FlushPendingOffset() {
|
|
if (PendingOffset != 0) {
|
|
UnwindOpAsm.EmitSPOffset(-PendingOffset);
|
|
PendingOffset = 0;
|
|
}
|
|
}
|
|
|
|
void ARMELFStreamer::FlushUnwindOpcodes(bool NoHandlerData) {
|
|
// Emit the unwind opcode to restore $sp.
|
|
if (UsedFP) {
|
|
const MCRegisterInfo *MRI = getContext().getRegisterInfo();
|
|
int64_t LastRegSaveSPOffset = SPOffset - PendingOffset;
|
|
UnwindOpAsm.EmitSPOffset(LastRegSaveSPOffset - FPOffset);
|
|
UnwindOpAsm.EmitSetSP(MRI->getEncodingValue(FPReg));
|
|
} else {
|
|
FlushPendingOffset();
|
|
}
|
|
|
|
// Finalize the unwind opcode sequence
|
|
UnwindOpAsm.Finalize(PersonalityIndex, Opcodes);
|
|
|
|
// For compact model 0, we have to emit the unwind opcodes in the .ARM.exidx
|
|
// section. Thus, we don't have to create an entry in the .ARM.extab
|
|
// section.
|
|
if (NoHandlerData && PersonalityIndex == ARM::EHABI::AEABI_UNWIND_CPP_PR0)
|
|
return;
|
|
|
|
// Switch to .ARM.extab section.
|
|
SwitchToExTabSection(*FnStart);
|
|
|
|
// Create .ARM.extab label for offset in .ARM.exidx
|
|
assert(!ExTab);
|
|
ExTab = getContext().CreateTempSymbol();
|
|
EmitLabel(ExTab);
|
|
|
|
// Emit personality
|
|
if (Personality) {
|
|
const MCSymbolRefExpr *PersonalityRef =
|
|
MCSymbolRefExpr::Create(Personality,
|
|
MCSymbolRefExpr::VK_ARM_PREL31,
|
|
getContext());
|
|
|
|
EmitValue(PersonalityRef, 4);
|
|
}
|
|
|
|
// Emit unwind opcodes
|
|
assert((Opcodes.size() % 4) == 0 &&
|
|
"Unwind opcode size for __aeabi_cpp_unwind_pr0 must be multiple of 4");
|
|
for (unsigned I = 0; I != Opcodes.size(); I += 4) {
|
|
uint64_t Intval = Opcodes[I] |
|
|
Opcodes[I + 1] << 8 |
|
|
Opcodes[I + 2] << 16 |
|
|
Opcodes[I + 3] << 24;
|
|
EmitIntValue(Intval, 4);
|
|
}
|
|
|
|
// According to ARM EHABI section 9.2, if the __aeabi_unwind_cpp_pr1() or
|
|
// __aeabi_unwind_cpp_pr2() is used, then the handler data must be emitted
|
|
// after the unwind opcodes. The handler data consists of several 32-bit
|
|
// words, and should be terminated by zero.
|
|
//
|
|
// In case that the .handlerdata directive is not specified by the
|
|
// programmer, we should emit zero to terminate the handler data.
|
|
if (NoHandlerData && !Personality)
|
|
EmitIntValue(0, 4);
|
|
}
|
|
|
|
void ARMELFStreamer::emitHandlerData() { FlushUnwindOpcodes(false); }
|
|
|
|
void ARMELFStreamer::emitPersonality(const MCSymbol *Per) {
|
|
Personality = Per;
|
|
UnwindOpAsm.setPersonality(Per);
|
|
}
|
|
|
|
void ARMELFStreamer::emitPersonalityIndex(unsigned Index) {
|
|
assert(Index < ARM::EHABI::NUM_PERSONALITY_INDEX && "invalid index");
|
|
PersonalityIndex = Index;
|
|
}
|
|
|
|
void ARMELFStreamer::emitSetFP(unsigned NewFPReg, unsigned NewSPReg,
|
|
int64_t Offset) {
|
|
assert((NewSPReg == ARM::SP || NewSPReg == FPReg) &&
|
|
"the operand of .setfp directive should be either $sp or $fp");
|
|
|
|
UsedFP = true;
|
|
FPReg = NewFPReg;
|
|
|
|
if (NewSPReg == ARM::SP)
|
|
FPOffset = SPOffset + Offset;
|
|
else
|
|
FPOffset += Offset;
|
|
}
|
|
|
|
void ARMELFStreamer::emitMovSP(unsigned Reg, int64_t Offset) {
|
|
assert((Reg != ARM::SP && Reg != ARM::PC) &&
|
|
"the operand of .movsp cannot be either sp or pc");
|
|
assert(FPReg == ARM::SP && "current FP must be SP");
|
|
|
|
FlushPendingOffset();
|
|
|
|
FPReg = Reg;
|
|
FPOffset = SPOffset + Offset;
|
|
|
|
const MCRegisterInfo *MRI = getContext().getRegisterInfo();
|
|
UnwindOpAsm.EmitSetSP(MRI->getEncodingValue(FPReg));
|
|
}
|
|
|
|
void ARMELFStreamer::emitPad(int64_t Offset) {
|
|
// Track the change of the $sp offset
|
|
SPOffset -= Offset;
|
|
|
|
// To squash multiple .pad directives, we should delay the unwind opcode
|
|
// until the .save, .vsave, .handlerdata, or .fnend directives.
|
|
PendingOffset -= Offset;
|
|
}
|
|
|
|
void ARMELFStreamer::emitRegSave(const SmallVectorImpl<unsigned> &RegList,
|
|
bool IsVector) {
|
|
// Collect the registers in the register list
|
|
unsigned Count = 0;
|
|
uint32_t Mask = 0;
|
|
const MCRegisterInfo *MRI = getContext().getRegisterInfo();
|
|
for (size_t i = 0; i < RegList.size(); ++i) {
|
|
unsigned Reg = MRI->getEncodingValue(RegList[i]);
|
|
assert(Reg < (IsVector ? 32U : 16U) && "Register out of range");
|
|
unsigned Bit = (1u << Reg);
|
|
if ((Mask & Bit) == 0) {
|
|
Mask |= Bit;
|
|
++Count;
|
|
}
|
|
}
|
|
|
|
// Track the change the $sp offset: For the .save directive, the
|
|
// corresponding push instruction will decrease the $sp by (4 * Count).
|
|
// For the .vsave directive, the corresponding vpush instruction will
|
|
// decrease $sp by (8 * Count).
|
|
SPOffset -= Count * (IsVector ? 8 : 4);
|
|
|
|
// Emit the opcode
|
|
FlushPendingOffset();
|
|
if (IsVector)
|
|
UnwindOpAsm.EmitVFPRegSave(Mask);
|
|
else
|
|
UnwindOpAsm.EmitRegSave(Mask);
|
|
}
|
|
|
|
void ARMELFStreamer::emitUnwindRaw(int64_t Offset,
|
|
const SmallVectorImpl<uint8_t> &Opcodes) {
|
|
FlushPendingOffset();
|
|
SPOffset = SPOffset - Offset;
|
|
UnwindOpAsm.EmitRaw(Opcodes);
|
|
}
|
|
|
|
namespace llvm {
|
|
|
|
MCStreamer *createMCAsmStreamer(MCContext &Ctx, formatted_raw_ostream &OS,
|
|
bool isVerboseAsm, bool useDwarfDirectory,
|
|
MCInstPrinter *InstPrint, MCCodeEmitter *CE,
|
|
MCAsmBackend *TAB, bool ShowInst) {
|
|
MCStreamer *S = llvm::createAsmStreamer(
|
|
Ctx, OS, isVerboseAsm, useDwarfDirectory, InstPrint, CE, TAB, ShowInst);
|
|
new ARMTargetAsmStreamer(*S, OS, *InstPrint, isVerboseAsm);
|
|
return S;
|
|
}
|
|
|
|
MCStreamer *createARMNullStreamer(MCContext &Ctx) {
|
|
MCStreamer *S = llvm::createNullStreamer(Ctx);
|
|
new ARMTargetStreamer(*S);
|
|
return S;
|
|
}
|
|
|
|
MCELFStreamer *createARMELFStreamer(MCContext &Context, MCAsmBackend &TAB,
|
|
raw_ostream &OS, MCCodeEmitter *Emitter,
|
|
bool RelaxAll, bool IsThumb) {
|
|
ARMELFStreamer *S = new ARMELFStreamer(Context, TAB, OS, Emitter, IsThumb);
|
|
new ARMTargetELFStreamer(*S);
|
|
// FIXME: This should eventually end up somewhere else where more
|
|
// intelligent flag decisions can be made. For now we are just maintaining
|
|
// the status quo for ARM and setting EF_ARM_EABI_VER5 as the default.
|
|
S->getAssembler().setELFHeaderEFlags(ELF::EF_ARM_EABI_VER5);
|
|
|
|
if (RelaxAll)
|
|
S->getAssembler().setRelaxAll(true);
|
|
return S;
|
|
}
|
|
|
|
}
|
|
|
|
|