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llvm-6502/lib/Target/ARM/ARMAsmPrinter.cpp
Jim Grosbach 3e55612472 First part of refactoring ARM addrmode2 (load/store) instructions to be more 
explicit about the operands. Split out the different variants into separate
instructions. This gives us the ability to, among other things, assign
different scheduling itineraries to the variants. rdar://8477752.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117409 91177308-0d34-0410-b5e6-96231b3b80d8
2010-10-26 22:37:02 +00:00

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//===-- ARMAsmPrinter.cpp - Print machine code to an ARM .s file ----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains a printer that converts from our internal representation
// of machine-dependent LLVM code to GAS-format ARM assembly language.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "asm-printer"
#include "ARM.h"
#include "ARMBuildAttrs.h"
#include "ARMAddressingModes.h"
#include "ARMConstantPoolValue.h"
#include "InstPrinter/ARMInstPrinter.h"
#include "ARMMachineFunctionInfo.h"
#include "ARMMCInstLower.h"
#include "ARMTargetMachine.h"
#include "ARMTargetObjectFile.h"
#include "llvm/Analysis/DebugInfo.h"
#include "llvm/Constants.h"
#include "llvm/Module.h"
#include "llvm/Type.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineModuleInfoImpls.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCObjectStreamer.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Target/Mangler.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetRegistry.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include <cctype>
using namespace llvm;
namespace llvm {
namespace ARM {
enum DW_ISA {
DW_ISA_ARM_thumb = 1,
DW_ISA_ARM_arm = 2
};
}
}
namespace {
// Per section and per symbol attributes are not supported.
// To implement them we would need the ability to delay this emission
// until the assembly file is fully parsed/generated as only then do we
// know the symbol and section numbers.
class AttributeEmitter {
public:
virtual void MaybeSwitchVendor(StringRef Vendor) = 0;
virtual void EmitAttribute(unsigned Attribute, unsigned Value) = 0;
virtual void Finish() = 0;
virtual ~AttributeEmitter() {}
};
class AsmAttributeEmitter : public AttributeEmitter {
MCStreamer &Streamer;
public:
AsmAttributeEmitter(MCStreamer &Streamer_) : Streamer(Streamer_) {}
void MaybeSwitchVendor(StringRef Vendor) { }
void EmitAttribute(unsigned Attribute, unsigned Value) {
Streamer.EmitRawText("\t.eabi_attribute " +
Twine(Attribute) + ", " + Twine(Value));
}
void Finish() { }
};
class ObjectAttributeEmitter : public AttributeEmitter {
MCObjectStreamer &Streamer;
StringRef CurrentVendor;
SmallString<64> Contents;
public:
ObjectAttributeEmitter(MCObjectStreamer &Streamer_) :
Streamer(Streamer_), CurrentVendor("") { }
void MaybeSwitchVendor(StringRef Vendor) {
assert(!Vendor.empty() && "Vendor cannot be empty.");
if (CurrentVendor.empty())
CurrentVendor = Vendor;
else if (CurrentVendor == Vendor)
return;
else
Finish();
CurrentVendor = Vendor;
assert(Contents.size() == 0);
}
void EmitAttribute(unsigned Attribute, unsigned Value) {
// FIXME: should be ULEB
Contents += Attribute;
Contents += Value;
}
void Finish() {
const size_t ContentsSize = Contents.size();
// Vendor size + Vendor name + '\0'
const size_t VendorHeaderSize = 4 + CurrentVendor.size() + 1;
// Tag + Tag Size
const size_t TagHeaderSize = 1 + 4;
Streamer.EmitIntValue(VendorHeaderSize + TagHeaderSize + ContentsSize, 4);
Streamer.EmitBytes(CurrentVendor, 0);
Streamer.EmitIntValue(0, 1); // '\0'
Streamer.EmitIntValue(ARMBuildAttrs::File, 1);
Streamer.EmitIntValue(TagHeaderSize + ContentsSize, 4);
Streamer.EmitBytes(Contents, 0);
Contents.clear();
}
};
class ARMAsmPrinter : public AsmPrinter {
/// Subtarget - Keep a pointer to the ARMSubtarget around so that we can
/// make the right decision when printing asm code for different targets.
const ARMSubtarget *Subtarget;
/// AFI - Keep a pointer to ARMFunctionInfo for the current
/// MachineFunction.
ARMFunctionInfo *AFI;
/// MCP - Keep a pointer to constantpool entries of the current
/// MachineFunction.
const MachineConstantPool *MCP;
public:
explicit ARMAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
: AsmPrinter(TM, Streamer), AFI(NULL), MCP(NULL) {
Subtarget = &TM.getSubtarget<ARMSubtarget>();
}
virtual const char *getPassName() const {
return "ARM Assembly Printer";
}
void printOperand(const MachineInstr *MI, int OpNum, raw_ostream &O,
const char *Modifier = 0);
virtual bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNum,
unsigned AsmVariant, const char *ExtraCode,
raw_ostream &O);
virtual bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum,
unsigned AsmVariant,
const char *ExtraCode, raw_ostream &O);
void EmitJumpTable(const MachineInstr *MI);
void EmitJump2Table(const MachineInstr *MI);
virtual void EmitInstruction(const MachineInstr *MI);
bool runOnMachineFunction(MachineFunction &F);
virtual void EmitConstantPool() {} // we emit constant pools customly!
virtual void EmitFunctionEntryLabel();
void EmitStartOfAsmFile(Module &M);
void EmitEndOfAsmFile(Module &M);
private:
// Helpers for EmitStartOfAsmFile() and EmitEndOfAsmFile()
void emitAttributes();
// Helper for ELF .o only
void emitARMAttributeSection();
public:
void PrintDebugValueComment(const MachineInstr *MI, raw_ostream &OS);
MachineLocation getDebugValueLocation(const MachineInstr *MI) const {
MachineLocation Location;
assert (MI->getNumOperands() == 4 && "Invalid no. of machine operands!");
// Frame address. Currently handles register +- offset only.
if (MI->getOperand(0).isReg() && MI->getOperand(1).isImm())
Location.set(MI->getOperand(0).getReg(), MI->getOperand(1).getImm());
else {
DEBUG(dbgs() << "DBG_VALUE instruction ignored! " << *MI << "\n");
}
return Location;
}
virtual unsigned getISAEncoding() {
// ARM/Darwin adds ISA to the DWARF info for each function.
if (!Subtarget->isTargetDarwin())
return 0;
return Subtarget->isThumb() ?
llvm::ARM::DW_ISA_ARM_thumb : llvm::ARM::DW_ISA_ARM_arm;
}
MCSymbol *GetARMSetPICJumpTableLabel2(unsigned uid, unsigned uid2,
const MachineBasicBlock *MBB) const;
MCSymbol *GetARMJTIPICJumpTableLabel2(unsigned uid, unsigned uid2) const;
MCSymbol *GetARMSJLJEHLabel(void) const;
/// EmitMachineConstantPoolValue - Print a machine constantpool value to
/// the .s file.
virtual void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
SmallString<128> Str;
raw_svector_ostream OS(Str);
EmitMachineConstantPoolValue(MCPV, OS);
OutStreamer.EmitRawText(OS.str());
}
void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV,
raw_ostream &O) {
switch (TM.getTargetData()->getTypeAllocSize(MCPV->getType())) {
case 1: O << MAI->getData8bitsDirective(0); break;
case 2: O << MAI->getData16bitsDirective(0); break;
case 4: O << MAI->getData32bitsDirective(0); break;
default: assert(0 && "Unknown CPV size");
}
ARMConstantPoolValue *ACPV = static_cast<ARMConstantPoolValue*>(MCPV);
if (ACPV->isLSDA()) {
O << MAI->getPrivateGlobalPrefix() << "_LSDA_" << getFunctionNumber();
} else if (ACPV->isBlockAddress()) {
O << *GetBlockAddressSymbol(ACPV->getBlockAddress());
} else if (ACPV->isGlobalValue()) {
const GlobalValue *GV = ACPV->getGV();
bool isIndirect = Subtarget->isTargetDarwin() &&
Subtarget->GVIsIndirectSymbol(GV, TM.getRelocationModel());
if (!isIndirect)
O << *Mang->getSymbol(GV);
else {
// FIXME: Remove this when Darwin transition to @GOT like syntax.
MCSymbol *Sym = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
O << *Sym;
MachineModuleInfoMachO &MMIMachO =
MMI->getObjFileInfo<MachineModuleInfoMachO>();
MachineModuleInfoImpl::StubValueTy &StubSym =
GV->hasHiddenVisibility() ? MMIMachO.getHiddenGVStubEntry(Sym) :
MMIMachO.getGVStubEntry(Sym);
if (StubSym.getPointer() == 0)
StubSym = MachineModuleInfoImpl::
StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage());
}
} else {
assert(ACPV->isExtSymbol() && "unrecognized constant pool value");
O << *GetExternalSymbolSymbol(ACPV->getSymbol());
}
if (ACPV->hasModifier()) O << "(" << ACPV->getModifier() << ")";
if (ACPV->getPCAdjustment() != 0) {
O << "-(" << MAI->getPrivateGlobalPrefix() << "PC"
<< getFunctionNumber() << "_" << ACPV->getLabelId()
<< "+" << (unsigned)ACPV->getPCAdjustment();
if (ACPV->mustAddCurrentAddress())
O << "-.";
O << ')';
}
}
};
} // end of anonymous namespace
void ARMAsmPrinter::EmitFunctionEntryLabel() {
if (AFI->isThumbFunction()) {
OutStreamer.EmitRawText(StringRef("\t.code\t16"));
if (!Subtarget->isTargetDarwin())
OutStreamer.EmitRawText(StringRef("\t.thumb_func"));
else {
// This needs to emit to a temporary string to get properly quoted
// MCSymbols when they have spaces in them.
SmallString<128> Tmp;
raw_svector_ostream OS(Tmp);
OS << "\t.thumb_func\t" << *CurrentFnSym;
OutStreamer.EmitRawText(OS.str());
}
}
OutStreamer.EmitLabel(CurrentFnSym);
}
/// runOnMachineFunction - This uses the EmitInstruction()
/// method to print assembly for each instruction.
///
bool ARMAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
AFI = MF.getInfo<ARMFunctionInfo>();
MCP = MF.getConstantPool();
return AsmPrinter::runOnMachineFunction(MF);
}
void ARMAsmPrinter::printOperand(const MachineInstr *MI, int OpNum,
raw_ostream &O, const char *Modifier) {
const MachineOperand &MO = MI->getOperand(OpNum);
unsigned TF = MO.getTargetFlags();
switch (MO.getType()) {
default:
assert(0 && "<unknown operand type>");
case MachineOperand::MO_Register: {
unsigned Reg = MO.getReg();
assert(TargetRegisterInfo::isPhysicalRegister(Reg));
assert(!MO.getSubReg() && "Subregs should be eliminated!");
O << ARMInstPrinter::getRegisterName(Reg);
break;
}
case MachineOperand::MO_Immediate: {
int64_t Imm = MO.getImm();
O << '#';
if ((Modifier && strcmp(Modifier, "lo16") == 0) ||
(TF == ARMII::MO_LO16))
O << ":lower16:";
else if ((Modifier && strcmp(Modifier, "hi16") == 0) ||
(TF == ARMII::MO_HI16))
O << ":upper16:";
O << Imm;
break;
}
case MachineOperand::MO_MachineBasicBlock:
O << *MO.getMBB()->getSymbol();
return;
case MachineOperand::MO_GlobalAddress: {
const GlobalValue *GV = MO.getGlobal();
if ((Modifier && strcmp(Modifier, "lo16") == 0) ||
(TF & ARMII::MO_LO16))
O << ":lower16:";
else if ((Modifier && strcmp(Modifier, "hi16") == 0) ||
(TF & ARMII::MO_HI16))
O << ":upper16:";
O << *Mang->getSymbol(GV);
printOffset(MO.getOffset(), O);
if (TF == ARMII::MO_PLT)
O << "(PLT)";
break;
}
case MachineOperand::MO_ExternalSymbol: {
O << *GetExternalSymbolSymbol(MO.getSymbolName());
if (TF == ARMII::MO_PLT)
O << "(PLT)";
break;
}
case MachineOperand::MO_ConstantPoolIndex:
O << *GetCPISymbol(MO.getIndex());
break;
case MachineOperand::MO_JumpTableIndex:
O << *GetJTISymbol(MO.getIndex());
break;
}
}
//===--------------------------------------------------------------------===//
MCSymbol *ARMAsmPrinter::
GetARMSetPICJumpTableLabel2(unsigned uid, unsigned uid2,
const MachineBasicBlock *MBB) const {
SmallString<60> Name;
raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix()
<< getFunctionNumber() << '_' << uid << '_' << uid2
<< "_set_" << MBB->getNumber();
return OutContext.GetOrCreateSymbol(Name.str());
}
MCSymbol *ARMAsmPrinter::
GetARMJTIPICJumpTableLabel2(unsigned uid, unsigned uid2) const {
SmallString<60> Name;
raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "JTI"
<< getFunctionNumber() << '_' << uid << '_' << uid2;
return OutContext.GetOrCreateSymbol(Name.str());
}
MCSymbol *ARMAsmPrinter::GetARMSJLJEHLabel(void) const {
SmallString<60> Name;
raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "SJLJEH"
<< getFunctionNumber();
return OutContext.GetOrCreateSymbol(Name.str());
}
bool ARMAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNum,
unsigned AsmVariant, const char *ExtraCode,
raw_ostream &O) {
// Does this asm operand have a single letter operand modifier?
if (ExtraCode && ExtraCode[0]) {
if (ExtraCode[1] != 0) return true; // Unknown modifier.
switch (ExtraCode[0]) {
default: return true; // Unknown modifier.
case 'a': // Print as a memory address.
if (MI->getOperand(OpNum).isReg()) {
O << "["
<< ARMInstPrinter::getRegisterName(MI->getOperand(OpNum).getReg())
<< "]";
return false;
}
// Fallthrough
case 'c': // Don't print "#" before an immediate operand.
if (!MI->getOperand(OpNum).isImm())
return true;
O << MI->getOperand(OpNum).getImm();
return false;
case 'P': // Print a VFP double precision register.
case 'q': // Print a NEON quad precision register.
printOperand(MI, OpNum, O);
return false;
case 'Q':
case 'R':
case 'H':
report_fatal_error("llvm does not support 'Q', 'R', and 'H' modifiers!");
return true;
}
}
printOperand(MI, OpNum, O);
return false;
}
bool ARMAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
unsigned OpNum, unsigned AsmVariant,
const char *ExtraCode,
raw_ostream &O) {
if (ExtraCode && ExtraCode[0])
return true; // Unknown modifier.
const MachineOperand &MO = MI->getOperand(OpNum);
assert(MO.isReg() && "unexpected inline asm memory operand");
O << "[" << ARMInstPrinter::getRegisterName(MO.getReg()) << "]";
return false;
}
void ARMAsmPrinter::EmitStartOfAsmFile(Module &M) {
if (Subtarget->isTargetDarwin()) {
Reloc::Model RelocM = TM.getRelocationModel();
if (RelocM == Reloc::PIC_ || RelocM == Reloc::DynamicNoPIC) {
// Declare all the text sections up front (before the DWARF sections
// emitted by AsmPrinter::doInitialization) so the assembler will keep
// them together at the beginning of the object file. This helps
// avoid out-of-range branches that are due a fundamental limitation of
// the way symbol offsets are encoded with the current Darwin ARM
// relocations.
const TargetLoweringObjectFileMachO &TLOFMacho =
static_cast<const TargetLoweringObjectFileMachO &>(
getObjFileLowering());
OutStreamer.SwitchSection(TLOFMacho.getTextSection());
OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
OutStreamer.SwitchSection(TLOFMacho.getConstTextCoalSection());
if (RelocM == Reloc::DynamicNoPIC) {
const MCSection *sect =
OutContext.getMachOSection("__TEXT", "__symbol_stub4",
MCSectionMachO::S_SYMBOL_STUBS,
12, SectionKind::getText());
OutStreamer.SwitchSection(sect);
} else {
const MCSection *sect =
OutContext.getMachOSection("__TEXT", "__picsymbolstub4",
MCSectionMachO::S_SYMBOL_STUBS,
16, SectionKind::getText());
OutStreamer.SwitchSection(sect);
}
const MCSection *StaticInitSect =
OutContext.getMachOSection("__TEXT", "__StaticInit",
MCSectionMachO::S_REGULAR |
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
SectionKind::getText());
OutStreamer.SwitchSection(StaticInitSect);
}
}
// Use unified assembler syntax.
OutStreamer.EmitAssemblerFlag(MCAF_SyntaxUnified);
// Emit ARM Build Attributes
if (Subtarget->isTargetELF()) {
emitAttributes();
}
}
void ARMAsmPrinter::EmitEndOfAsmFile(Module &M) {
if (Subtarget->isTargetDarwin()) {
// All darwin targets use mach-o.
const TargetLoweringObjectFileMachO &TLOFMacho =
static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
MachineModuleInfoMachO &MMIMacho =
MMI->getObjFileInfo<MachineModuleInfoMachO>();
// Output non-lazy-pointers for external and common global variables.
MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetGVStubList();
if (!Stubs.empty()) {
// Switch with ".non_lazy_symbol_pointer" directive.
OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
EmitAlignment(2);
for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
// L_foo$stub:
OutStreamer.EmitLabel(Stubs[i].first);
// .indirect_symbol _foo
MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
OutStreamer.EmitSymbolAttribute(MCSym.getPointer(),MCSA_IndirectSymbol);
if (MCSym.getInt())
// External to current translation unit.
OutStreamer.EmitIntValue(0, 4/*size*/, 0/*addrspace*/);
else
// Internal to current translation unit.
//
// When we place the LSDA into the TEXT section, the type info
// pointers need to be indirect and pc-rel. We accomplish this by
// using NLPs; however, sometimes the types are local to the file.
// We need to fill in the value for the NLP in those cases.
OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
OutContext),
4/*size*/, 0/*addrspace*/);
}
Stubs.clear();
OutStreamer.AddBlankLine();
}
Stubs = MMIMacho.GetHiddenGVStubList();
if (!Stubs.empty()) {
OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
EmitAlignment(2);
for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
// L_foo$stub:
OutStreamer.EmitLabel(Stubs[i].first);
// .long _foo
OutStreamer.EmitValue(MCSymbolRefExpr::
Create(Stubs[i].second.getPointer(),
OutContext),
4/*size*/, 0/*addrspace*/);
}
Stubs.clear();
OutStreamer.AddBlankLine();
}
// Funny Darwin hack: This flag tells the linker that no global symbols
// contain code that falls through to other global symbols (e.g. the obvious
// implementation of multiple entry points). If this doesn't occur, the
// linker can safely perform dead code stripping. Since LLVM never
// generates code that does this, it is always safe to set.
OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
}
}
//===----------------------------------------------------------------------===//
// Helper routines for EmitStartOfAsmFile() and EmitEndOfAsmFile()
// FIXME:
// The following seem like one-off assembler flags, but they actually need
// to appear in the .ARM.attributes section in ELF.
// Instead of subclassing the MCELFStreamer, we do the work here.
void ARMAsmPrinter::emitAttributes() {
emitARMAttributeSection();
AttributeEmitter *AttrEmitter;
if (OutStreamer.hasRawTextSupport())
AttrEmitter = new AsmAttributeEmitter(OutStreamer);
else {
MCObjectStreamer &O = static_cast<MCObjectStreamer&>(OutStreamer);
AttrEmitter = new ObjectAttributeEmitter(O);
}
AttrEmitter->MaybeSwitchVendor("aeabi");
std::string CPUString = Subtarget->getCPUString();
if (OutStreamer.hasRawTextSupport()) {
if (CPUString != "generic")
OutStreamer.EmitRawText(StringRef("\t.cpu ") + CPUString);
} else {
assert(CPUString == "generic" && "Unsupported .cpu attribute for ELF/.o");
// FIXME: Why these defaults?
AttrEmitter->EmitAttribute(ARMBuildAttrs::CPU_arch, ARMBuildAttrs::v4T);
AttrEmitter->EmitAttribute(ARMBuildAttrs::ARM_ISA_use, 1);
AttrEmitter->EmitAttribute(ARMBuildAttrs::THUMB_ISA_use, 1);
}
// FIXME: Emit FPU type
if (Subtarget->hasVFP2())
AttrEmitter->EmitAttribute(ARMBuildAttrs::VFP_arch, 2);
// Signal various FP modes.
if (!UnsafeFPMath) {
AttrEmitter->EmitAttribute(ARMBuildAttrs::ABI_FP_denormal, 1);
AttrEmitter->EmitAttribute(ARMBuildAttrs::ABI_FP_exceptions, 1);
}
if (NoInfsFPMath && NoNaNsFPMath)
AttrEmitter->EmitAttribute(ARMBuildAttrs::ABI_FP_number_model, 1);
else
AttrEmitter->EmitAttribute(ARMBuildAttrs::ABI_FP_number_model, 3);
// 8-bytes alignment stuff.
AttrEmitter->EmitAttribute(ARMBuildAttrs::ABI_align8_needed, 1);
AttrEmitter->EmitAttribute(ARMBuildAttrs::ABI_align8_preserved, 1);
// Hard float. Use both S and D registers and conform to AAPCS-VFP.
if (Subtarget->isAAPCS_ABI() && FloatABIType == FloatABI::Hard) {
AttrEmitter->EmitAttribute(ARMBuildAttrs::ABI_HardFP_use, 3);
AttrEmitter->EmitAttribute(ARMBuildAttrs::ABI_VFP_args, 1);
}
// FIXME: Should we signal R9 usage?
AttrEmitter->EmitAttribute(ARMBuildAttrs::DIV_use, 1);
AttrEmitter->Finish();
delete AttrEmitter;
}
void ARMAsmPrinter::emitARMAttributeSection() {
// <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 (OutStreamer.hasRawTextSupport())
return;
const ARMElfTargetObjectFile &TLOFELF =
static_cast<const ARMElfTargetObjectFile &>
(getObjFileLowering());
OutStreamer.SwitchSection(TLOFELF.getAttributesSection());
// Format version
OutStreamer.EmitIntValue(0x41, 1);
}
//===----------------------------------------------------------------------===//
static MCSymbol *getPICLabel(const char *Prefix, unsigned FunctionNumber,
unsigned LabelId, MCContext &Ctx) {
MCSymbol *Label = Ctx.GetOrCreateSymbol(Twine(Prefix)
+ "PC" + Twine(FunctionNumber) + "_" + Twine(LabelId));
return Label;
}
void ARMAsmPrinter::EmitJumpTable(const MachineInstr *MI) {
unsigned Opcode = MI->getOpcode();
int OpNum = 1;
if (Opcode == ARM::BR_JTadd)
OpNum = 2;
else if (Opcode == ARM::BR_JTm)
OpNum = 3;
const MachineOperand &MO1 = MI->getOperand(OpNum);
const MachineOperand &MO2 = MI->getOperand(OpNum+1); // Unique Id
unsigned JTI = MO1.getIndex();
// Emit a label for the jump table.
MCSymbol *JTISymbol = GetARMJTIPICJumpTableLabel2(JTI, MO2.getImm());
OutStreamer.EmitLabel(JTISymbol);
// Emit each entry of the table.
const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
for (unsigned i = 0, e = JTBBs.size(); i != e; ++i) {
MachineBasicBlock *MBB = JTBBs[i];
// Construct an MCExpr for the entry. We want a value of the form:
// (BasicBlockAddr - TableBeginAddr)
//
// For example, a table with entries jumping to basic blocks BB0 and BB1
// would look like:
// LJTI_0_0:
// .word (LBB0 - LJTI_0_0)
// .word (LBB1 - LJTI_0_0)
const MCExpr *Expr = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
if (TM.getRelocationModel() == Reloc::PIC_)
Expr = MCBinaryExpr::CreateSub(Expr, MCSymbolRefExpr::Create(JTISymbol,
OutContext),
OutContext);
OutStreamer.EmitValue(Expr, 4);
}
}
void ARMAsmPrinter::EmitJump2Table(const MachineInstr *MI) {
unsigned Opcode = MI->getOpcode();
int OpNum = (Opcode == ARM::t2BR_JT) ? 2 : 1;
const MachineOperand &MO1 = MI->getOperand(OpNum);
const MachineOperand &MO2 = MI->getOperand(OpNum+1); // Unique Id
unsigned JTI = MO1.getIndex();
// Emit a label for the jump table.
MCSymbol *JTISymbol = GetARMJTIPICJumpTableLabel2(JTI, MO2.getImm());
OutStreamer.EmitLabel(JTISymbol);
// Emit each entry of the table.
const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
unsigned OffsetWidth = 4;
if (MI->getOpcode() == ARM::t2TBB)
OffsetWidth = 1;
else if (MI->getOpcode() == ARM::t2TBH)
OffsetWidth = 2;
for (unsigned i = 0, e = JTBBs.size(); i != e; ++i) {
MachineBasicBlock *MBB = JTBBs[i];
const MCExpr *MBBSymbolExpr = MCSymbolRefExpr::Create(MBB->getSymbol(),
OutContext);
// If this isn't a TBB or TBH, the entries are direct branch instructions.
if (OffsetWidth == 4) {
MCInst BrInst;
BrInst.setOpcode(ARM::t2B);
BrInst.addOperand(MCOperand::CreateExpr(MBBSymbolExpr));
OutStreamer.EmitInstruction(BrInst);
continue;
}
// Otherwise it's an offset from the dispatch instruction. Construct an
// MCExpr for the entry. We want a value of the form:
// (BasicBlockAddr - TableBeginAddr) / 2
//
// For example, a TBB table with entries jumping to basic blocks BB0 and BB1
// would look like:
// LJTI_0_0:
// .byte (LBB0 - LJTI_0_0) / 2
// .byte (LBB1 - LJTI_0_0) / 2
const MCExpr *Expr =
MCBinaryExpr::CreateSub(MBBSymbolExpr,
MCSymbolRefExpr::Create(JTISymbol, OutContext),
OutContext);
Expr = MCBinaryExpr::CreateDiv(Expr, MCConstantExpr::Create(2, OutContext),
OutContext);
OutStreamer.EmitValue(Expr, OffsetWidth);
}
// Make sure the instruction that follows TBB is 2-byte aligned.
// FIXME: Constant island pass should insert an "ALIGN" instruction instead.
if (MI->getOpcode() == ARM::t2TBB)
EmitAlignment(1);
}
void ARMAsmPrinter::PrintDebugValueComment(const MachineInstr *MI,
raw_ostream &OS) {
unsigned NOps = MI->getNumOperands();
assert(NOps==4);
OS << '\t' << MAI->getCommentString() << "DEBUG_VALUE: ";
// cast away const; DIetc do not take const operands for some reason.
DIVariable V(const_cast<MDNode *>(MI->getOperand(NOps-1).getMetadata()));
OS << V.getName();
OS << " <- ";
// Frame address. Currently handles register +- offset only.
assert(MI->getOperand(0).isReg() && MI->getOperand(1).isImm());
OS << '['; printOperand(MI, 0, OS); OS << '+'; printOperand(MI, 1, OS);
OS << ']';
OS << "+";
printOperand(MI, NOps-2, OS);
}
void ARMAsmPrinter::EmitInstruction(const MachineInstr *MI) {
ARMMCInstLower MCInstLowering(OutContext, *Mang, *this);
switch (MI->getOpcode()) {
case ARM::t2MOVi32imm:
assert(0 && "Should be lowered by thumb2it pass");
default: break;
case ARM::DBG_VALUE: {
if (isVerbose() && OutStreamer.hasRawTextSupport()) {
SmallString<128> TmpStr;
raw_svector_ostream OS(TmpStr);
PrintDebugValueComment(MI, OS);
OutStreamer.EmitRawText(StringRef(OS.str()));
}
return;
}
case ARM::tPICADD: {
// This is a pseudo op for a label + instruction sequence, which looks like:
// LPC0:
// add r0, pc
// This adds the address of LPC0 to r0.
// Emit the label.
OutStreamer.EmitLabel(getPICLabel(MAI->getPrivateGlobalPrefix(),
getFunctionNumber(), MI->getOperand(2).getImm(),
OutContext));
// Form and emit the add.
MCInst AddInst;
AddInst.setOpcode(ARM::tADDhirr);
AddInst.addOperand(MCOperand::CreateReg(MI->getOperand(0).getReg()));
AddInst.addOperand(MCOperand::CreateReg(MI->getOperand(0).getReg()));
AddInst.addOperand(MCOperand::CreateReg(ARM::PC));
// Add predicate operands.
AddInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
AddInst.addOperand(MCOperand::CreateReg(0));
OutStreamer.EmitInstruction(AddInst);
return;
}
case ARM::PICADD: {
// This is a pseudo op for a label + instruction sequence, which looks like:
// LPC0:
// add r0, pc, r0
// This adds the address of LPC0 to r0.
// Emit the label.
OutStreamer.EmitLabel(getPICLabel(MAI->getPrivateGlobalPrefix(),
getFunctionNumber(), MI->getOperand(2).getImm(),
OutContext));
// Form and emit the add.
MCInst AddInst;
AddInst.setOpcode(ARM::ADDrr);
AddInst.addOperand(MCOperand::CreateReg(MI->getOperand(0).getReg()));
AddInst.addOperand(MCOperand::CreateReg(ARM::PC));
AddInst.addOperand(MCOperand::CreateReg(MI->getOperand(1).getReg()));
// Add predicate operands.
AddInst.addOperand(MCOperand::CreateImm(MI->getOperand(3).getImm()));
AddInst.addOperand(MCOperand::CreateReg(MI->getOperand(4).getReg()));
// Add 's' bit operand (always reg0 for this)
AddInst.addOperand(MCOperand::CreateReg(0));
OutStreamer.EmitInstruction(AddInst);
return;
}
case ARM::PICSTR:
case ARM::PICSTRB:
case ARM::PICSTRH:
case ARM::PICLDR:
case ARM::PICLDRB:
case ARM::PICLDRH:
case ARM::PICLDRSB:
case ARM::PICLDRSH: {
// This is a pseudo op for a label + instruction sequence, which looks like:
// LPC0:
// OP r0, [pc, r0]
// The LCP0 label is referenced by a constant pool entry in order to get
// a PC-relative address at the ldr instruction.
// Emit the label.
OutStreamer.EmitLabel(getPICLabel(MAI->getPrivateGlobalPrefix(),
getFunctionNumber(), MI->getOperand(2).getImm(),
OutContext));
// Form and emit the load
unsigned Opcode;
switch (MI->getOpcode()) {
default:
llvm_unreachable("Unexpected opcode!");
case ARM::PICSTR: Opcode = ARM::STR; break;
case ARM::PICSTRB: Opcode = ARM::STRB; break;
case ARM::PICSTRH: Opcode = ARM::STRH; break;
case ARM::PICLDR: Opcode = ARM::LDRrs; break;
case ARM::PICLDRB: Opcode = ARM::LDRB; break;
case ARM::PICLDRH: Opcode = ARM::LDRH; break;
case ARM::PICLDRSB: Opcode = ARM::LDRSB; break;
case ARM::PICLDRSH: Opcode = ARM::LDRSH; break;
}
MCInst LdStInst;
LdStInst.setOpcode(Opcode);
LdStInst.addOperand(MCOperand::CreateReg(MI->getOperand(0).getReg()));
LdStInst.addOperand(MCOperand::CreateReg(ARM::PC));
LdStInst.addOperand(MCOperand::CreateReg(MI->getOperand(1).getReg()));
LdStInst.addOperand(MCOperand::CreateImm(0));
// Add predicate operands.
LdStInst.addOperand(MCOperand::CreateImm(MI->getOperand(3).getImm()));
LdStInst.addOperand(MCOperand::CreateReg(MI->getOperand(4).getReg()));
OutStreamer.EmitInstruction(LdStInst);
return;
}
case ARM::CONSTPOOL_ENTRY: {
/// CONSTPOOL_ENTRY - This instruction represents a floating constant pool
/// in the function. The first operand is the ID# for this instruction, the
/// second is the index into the MachineConstantPool that this is, the third
/// is the size in bytes of this constant pool entry.
unsigned LabelId = (unsigned)MI->getOperand(0).getImm();
unsigned CPIdx = (unsigned)MI->getOperand(1).getIndex();
EmitAlignment(2);
OutStreamer.EmitLabel(GetCPISymbol(LabelId));
const MachineConstantPoolEntry &MCPE = MCP->getConstants()[CPIdx];
if (MCPE.isMachineConstantPoolEntry())
EmitMachineConstantPoolValue(MCPE.Val.MachineCPVal);
else
EmitGlobalConstant(MCPE.Val.ConstVal);
return;
}
case ARM::MOVi2pieces: {
// FIXME: We'd like to remove the asm string in the .td file, but the
// This is a hack that lowers as a two instruction sequence.
unsigned DstReg = MI->getOperand(0).getReg();
unsigned ImmVal = (unsigned)MI->getOperand(1).getImm();
unsigned SOImmValV1 = ARM_AM::getSOImmTwoPartFirst(ImmVal);
unsigned SOImmValV2 = ARM_AM::getSOImmTwoPartSecond(ImmVal);
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::MOVi);
TmpInst.addOperand(MCOperand::CreateReg(DstReg));
TmpInst.addOperand(MCOperand::CreateImm(SOImmValV1));
// Predicate.
TmpInst.addOperand(MCOperand::CreateImm(MI->getOperand(2).getImm()));
TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(3).getReg()));
TmpInst.addOperand(MCOperand::CreateReg(0)); // cc_out
OutStreamer.EmitInstruction(TmpInst);
}
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::ORRri);
TmpInst.addOperand(MCOperand::CreateReg(DstReg)); // dstreg
TmpInst.addOperand(MCOperand::CreateReg(DstReg)); // inreg
TmpInst.addOperand(MCOperand::CreateImm(SOImmValV2)); // so_imm
// Predicate.
TmpInst.addOperand(MCOperand::CreateImm(MI->getOperand(2).getImm()));
TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(3).getReg()));
TmpInst.addOperand(MCOperand::CreateReg(0)); // cc_out
OutStreamer.EmitInstruction(TmpInst);
}
return;
}
case ARM::MOVi32imm: {
// FIXME: We'd like to remove the asm string in the .td file, but the
// This is a hack that lowers as a two instruction sequence.
unsigned DstReg = MI->getOperand(0).getReg();
const MachineOperand &MO = MI->getOperand(1);
MCOperand V1, V2;
if (MO.isImm()) {
unsigned ImmVal = (unsigned)MI->getOperand(1).getImm();
V1 = MCOperand::CreateImm(ImmVal & 65535);
V2 = MCOperand::CreateImm(ImmVal >> 16);
} else if (MO.isGlobal()) {
MCSymbol *Symbol = MCInstLowering.GetGlobalAddressSymbol(MO.getGlobal());
const MCSymbolRefExpr *SymRef1 =
MCSymbolRefExpr::Create(Symbol,
MCSymbolRefExpr::VK_ARM_LO16, OutContext);
const MCSymbolRefExpr *SymRef2 =
MCSymbolRefExpr::Create(Symbol,
MCSymbolRefExpr::VK_ARM_HI16, OutContext);
V1 = MCOperand::CreateExpr(SymRef1);
V2 = MCOperand::CreateExpr(SymRef2);
} else {
// FIXME: External symbol?
MI->dump();
llvm_unreachable("cannot handle this operand");
}
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::MOVi16);
TmpInst.addOperand(MCOperand::CreateReg(DstReg)); // dstreg
TmpInst.addOperand(V1); // lower16(imm)
// Predicate.
TmpInst.addOperand(MCOperand::CreateImm(MI->getOperand(2).getImm()));
TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(3).getReg()));
OutStreamer.EmitInstruction(TmpInst);
}
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::MOVTi16);
TmpInst.addOperand(MCOperand::CreateReg(DstReg)); // dstreg
TmpInst.addOperand(MCOperand::CreateReg(DstReg)); // srcreg
TmpInst.addOperand(V2); // upper16(imm)
// Predicate.
TmpInst.addOperand(MCOperand::CreateImm(MI->getOperand(2).getImm()));
TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(3).getReg()));
OutStreamer.EmitInstruction(TmpInst);
}
return;
}
case ARM::t2TBB:
case ARM::t2TBH:
case ARM::t2BR_JT: {
// Lower and emit the instruction itself, then the jump table following it.
MCInst TmpInst;
MCInstLowering.Lower(MI, TmpInst);
OutStreamer.EmitInstruction(TmpInst);
EmitJump2Table(MI);
return;
}
case ARM::tBR_JTr:
case ARM::BR_JTr:
case ARM::BR_JTm:
case ARM::BR_JTadd: {
// Lower and emit the instruction itself, then the jump table following it.
MCInst TmpInst;
MCInstLowering.Lower(MI, TmpInst);
OutStreamer.EmitInstruction(TmpInst);
EmitJumpTable(MI);
return;
}
case ARM::TRAP: {
// Non-Darwin binutils don't yet support the "trap" mnemonic.
// FIXME: Remove this special case when they do.
if (!Subtarget->isTargetDarwin()) {
//.long 0xe7ffdefe @ trap
uint32_t Val = 0xe7ffdefeUL;
OutStreamer.AddComment("trap");
OutStreamer.EmitIntValue(Val, 4);
return;
}
break;
}
case ARM::tTRAP: {
// Non-Darwin binutils don't yet support the "trap" mnemonic.
// FIXME: Remove this special case when they do.
if (!Subtarget->isTargetDarwin()) {
//.short 57086 @ trap
uint16_t Val = 0xdefe;
OutStreamer.AddComment("trap");
OutStreamer.EmitIntValue(Val, 2);
return;
}
break;
}
case ARM::t2Int_eh_sjlj_setjmp:
case ARM::t2Int_eh_sjlj_setjmp_nofp:
case ARM::tInt_eh_sjlj_setjmp: {
// Two incoming args: GPR:$src, GPR:$val
// mov $val, pc
// adds $val, #7
// str $val, [$src, #4]
// movs r0, #0
// b 1f
// movs r0, #1
// 1:
unsigned SrcReg = MI->getOperand(0).getReg();
unsigned ValReg = MI->getOperand(1).getReg();
MCSymbol *Label = GetARMSJLJEHLabel();
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::tMOVgpr2tgpr);
TmpInst.addOperand(MCOperand::CreateReg(ValReg));
TmpInst.addOperand(MCOperand::CreateReg(ARM::PC));
// 's' bit operand
TmpInst.addOperand(MCOperand::CreateReg(ARM::CPSR));
OutStreamer.AddComment("eh_setjmp begin");
OutStreamer.EmitInstruction(TmpInst);
}
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::tADDi3);
TmpInst.addOperand(MCOperand::CreateReg(ValReg));
// 's' bit operand
TmpInst.addOperand(MCOperand::CreateReg(ARM::CPSR));
TmpInst.addOperand(MCOperand::CreateReg(ValReg));
TmpInst.addOperand(MCOperand::CreateImm(7));
// Predicate.
TmpInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
TmpInst.addOperand(MCOperand::CreateReg(0));
OutStreamer.EmitInstruction(TmpInst);
}
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::tSTR);
TmpInst.addOperand(MCOperand::CreateReg(ValReg));
TmpInst.addOperand(MCOperand::CreateReg(SrcReg));
// The offset immediate is #4. The operand value is scaled by 4 for the
// tSTR instruction.
TmpInst.addOperand(MCOperand::CreateImm(1));
TmpInst.addOperand(MCOperand::CreateReg(0));
// Predicate.
TmpInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
TmpInst.addOperand(MCOperand::CreateReg(0));
OutStreamer.EmitInstruction(TmpInst);
}
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::tMOVi8);
TmpInst.addOperand(MCOperand::CreateReg(ARM::R0));
TmpInst.addOperand(MCOperand::CreateReg(ARM::CPSR));
TmpInst.addOperand(MCOperand::CreateImm(0));
// Predicate.
TmpInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
TmpInst.addOperand(MCOperand::CreateReg(0));
OutStreamer.EmitInstruction(TmpInst);
}
{
const MCExpr *SymbolExpr = MCSymbolRefExpr::Create(Label, OutContext);
MCInst TmpInst;
TmpInst.setOpcode(ARM::tB);
TmpInst.addOperand(MCOperand::CreateExpr(SymbolExpr));
OutStreamer.EmitInstruction(TmpInst);
}
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::tMOVi8);
TmpInst.addOperand(MCOperand::CreateReg(ARM::R0));
TmpInst.addOperand(MCOperand::CreateReg(ARM::CPSR));
TmpInst.addOperand(MCOperand::CreateImm(1));
// Predicate.
TmpInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
TmpInst.addOperand(MCOperand::CreateReg(0));
OutStreamer.AddComment("eh_setjmp end");
OutStreamer.EmitInstruction(TmpInst);
}
OutStreamer.EmitLabel(Label);
return;
}
case ARM::Int_eh_sjlj_setjmp_nofp:
case ARM::Int_eh_sjlj_setjmp: {
// Two incoming args: GPR:$src, GPR:$val
// add $val, pc, #8
// str $val, [$src, #+4]
// mov r0, #0
// add pc, pc, #0
// mov r0, #1
unsigned SrcReg = MI->getOperand(0).getReg();
unsigned ValReg = MI->getOperand(1).getReg();
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::ADDri);
TmpInst.addOperand(MCOperand::CreateReg(ValReg));
TmpInst.addOperand(MCOperand::CreateReg(ARM::PC));
TmpInst.addOperand(MCOperand::CreateImm(8));
// Predicate.
TmpInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
TmpInst.addOperand(MCOperand::CreateReg(0));
// 's' bit operand (always reg0 for this).
TmpInst.addOperand(MCOperand::CreateReg(0));
OutStreamer.AddComment("eh_setjmp begin");
OutStreamer.EmitInstruction(TmpInst);
}
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::STR);
TmpInst.addOperand(MCOperand::CreateReg(ValReg));
TmpInst.addOperand(MCOperand::CreateReg(SrcReg));
TmpInst.addOperand(MCOperand::CreateReg(0));
TmpInst.addOperand(MCOperand::CreateImm(4));
// Predicate.
TmpInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
TmpInst.addOperand(MCOperand::CreateReg(0));
OutStreamer.EmitInstruction(TmpInst);
}
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::MOVi);
TmpInst.addOperand(MCOperand::CreateReg(ARM::R0));
TmpInst.addOperand(MCOperand::CreateImm(0));
// Predicate.
TmpInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
TmpInst.addOperand(MCOperand::CreateReg(0));
// 's' bit operand (always reg0 for this).
TmpInst.addOperand(MCOperand::CreateReg(0));
OutStreamer.EmitInstruction(TmpInst);
}
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::ADDri);
TmpInst.addOperand(MCOperand::CreateReg(ARM::PC));
TmpInst.addOperand(MCOperand::CreateReg(ARM::PC));
TmpInst.addOperand(MCOperand::CreateImm(0));
// Predicate.
TmpInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
TmpInst.addOperand(MCOperand::CreateReg(0));
// 's' bit operand (always reg0 for this).
TmpInst.addOperand(MCOperand::CreateReg(0));
OutStreamer.EmitInstruction(TmpInst);
}
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::MOVi);
TmpInst.addOperand(MCOperand::CreateReg(ARM::R0));
TmpInst.addOperand(MCOperand::CreateImm(1));
// Predicate.
TmpInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
TmpInst.addOperand(MCOperand::CreateReg(0));
// 's' bit operand (always reg0 for this).
TmpInst.addOperand(MCOperand::CreateReg(0));
OutStreamer.AddComment("eh_setjmp end");
OutStreamer.EmitInstruction(TmpInst);
}
return;
}
case ARM::Int_eh_sjlj_longjmp: {
// ldr sp, [$src, #8]
// ldr $scratch, [$src, #4]
// ldr r7, [$src]
// bx $scratch
unsigned SrcReg = MI->getOperand(0).getReg();
unsigned ScratchReg = MI->getOperand(1).getReg();
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::LDRi12);
TmpInst.addOperand(MCOperand::CreateReg(ARM::SP));
TmpInst.addOperand(MCOperand::CreateReg(SrcReg));
TmpInst.addOperand(MCOperand::CreateImm(8));
// Predicate.
TmpInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
TmpInst.addOperand(MCOperand::CreateReg(0));
OutStreamer.EmitInstruction(TmpInst);
}
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::LDRi12);
TmpInst.addOperand(MCOperand::CreateReg(ScratchReg));
TmpInst.addOperand(MCOperand::CreateReg(SrcReg));
TmpInst.addOperand(MCOperand::CreateImm(4));
// Predicate.
TmpInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
TmpInst.addOperand(MCOperand::CreateReg(0));
OutStreamer.EmitInstruction(TmpInst);
}
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::LDRi12);
TmpInst.addOperand(MCOperand::CreateReg(ARM::R7));
TmpInst.addOperand(MCOperand::CreateReg(SrcReg));
TmpInst.addOperand(MCOperand::CreateImm(0));
// Predicate.
TmpInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
TmpInst.addOperand(MCOperand::CreateReg(0));
OutStreamer.EmitInstruction(TmpInst);
}
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::BRIND);
TmpInst.addOperand(MCOperand::CreateReg(ScratchReg));
// Predicate.
TmpInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
TmpInst.addOperand(MCOperand::CreateReg(0));
OutStreamer.EmitInstruction(TmpInst);
}
return;
}
case ARM::tInt_eh_sjlj_longjmp: {
// ldr $scratch, [$src, #8]
// mov sp, $scratch
// ldr $scratch, [$src, #4]
// ldr r7, [$src]
// bx $scratch
unsigned SrcReg = MI->getOperand(0).getReg();
unsigned ScratchReg = MI->getOperand(1).getReg();
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::tLDR);
TmpInst.addOperand(MCOperand::CreateReg(ScratchReg));
TmpInst.addOperand(MCOperand::CreateReg(SrcReg));
// The offset immediate is #8. The operand value is scaled by 4 for the
// tSTR instruction.
TmpInst.addOperand(MCOperand::CreateImm(2));
TmpInst.addOperand(MCOperand::CreateReg(0));
// Predicate.
TmpInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
TmpInst.addOperand(MCOperand::CreateReg(0));
OutStreamer.EmitInstruction(TmpInst);
}
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::tMOVtgpr2gpr);
TmpInst.addOperand(MCOperand::CreateReg(ARM::SP));
TmpInst.addOperand(MCOperand::CreateReg(ScratchReg));
// Predicate.
TmpInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
TmpInst.addOperand(MCOperand::CreateReg(0));
OutStreamer.EmitInstruction(TmpInst);
}
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::tLDR);
TmpInst.addOperand(MCOperand::CreateReg(ScratchReg));
TmpInst.addOperand(MCOperand::CreateReg(SrcReg));
TmpInst.addOperand(MCOperand::CreateImm(1));
TmpInst.addOperand(MCOperand::CreateReg(0));
// Predicate.
TmpInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
TmpInst.addOperand(MCOperand::CreateReg(0));
OutStreamer.EmitInstruction(TmpInst);
}
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::tLDR);
TmpInst.addOperand(MCOperand::CreateReg(ARM::R7));
TmpInst.addOperand(MCOperand::CreateReg(SrcReg));
TmpInst.addOperand(MCOperand::CreateImm(0));
TmpInst.addOperand(MCOperand::CreateReg(0));
// Predicate.
TmpInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
TmpInst.addOperand(MCOperand::CreateReg(0));
OutStreamer.EmitInstruction(TmpInst);
}
{
MCInst TmpInst;
TmpInst.setOpcode(ARM::tBX_RET_vararg);
TmpInst.addOperand(MCOperand::CreateReg(ScratchReg));
// Predicate.
TmpInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
TmpInst.addOperand(MCOperand::CreateReg(0));
OutStreamer.EmitInstruction(TmpInst);
}
return;
}
}
MCInst TmpInst;
MCInstLowering.Lower(MI, TmpInst);
OutStreamer.EmitInstruction(TmpInst);
}
//===----------------------------------------------------------------------===//
// Target Registry Stuff
//===----------------------------------------------------------------------===//
static MCInstPrinter *createARMMCInstPrinter(const Target &T,
unsigned SyntaxVariant,
const MCAsmInfo &MAI) {
if (SyntaxVariant == 0)
return new ARMInstPrinter(MAI);
return 0;
}
// Force static initialization.
extern "C" void LLVMInitializeARMAsmPrinter() {
RegisterAsmPrinter<ARMAsmPrinter> X(TheARMTarget);
RegisterAsmPrinter<ARMAsmPrinter> Y(TheThumbTarget);
TargetRegistry::RegisterMCInstPrinter(TheARMTarget, createARMMCInstPrinter);
TargetRegistry::RegisterMCInstPrinter(TheThumbTarget, createARMMCInstPrinter);
}
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