1 //===-- ARMAsmPrinter.cpp - Print machine code to an ARM .s file ----------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains a printer that converts from our internal representation
11 // of machine-dependent LLVM code to GAS-format ARM assembly language.
13 //===----------------------------------------------------------------------===//
15 #include "ARMAsmPrinter.h"
17 #include "ARMConstantPoolValue.h"
18 #include "ARMMachineFunctionInfo.h"
19 #include "ARMTargetMachine.h"
20 #include "ARMTargetObjectFile.h"
21 #include "InstPrinter/ARMInstPrinter.h"
22 #include "MCTargetDesc/ARMAddressingModes.h"
23 #include "MCTargetDesc/ARMMCExpr.h"
24 #include "llvm/ADT/SetVector.h"
25 #include "llvm/ADT/SmallString.h"
26 #include "llvm/CodeGen/MachineFunctionPass.h"
27 #include "llvm/CodeGen/MachineJumpTableInfo.h"
28 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
29 #include "llvm/IR/Constants.h"
30 #include "llvm/IR/DataLayout.h"
31 #include "llvm/IR/DebugInfo.h"
32 #include "llvm/IR/Mangler.h"
33 #include "llvm/IR/Module.h"
34 #include "llvm/IR/Type.h"
35 #include "llvm/MC/MCAsmInfo.h"
36 #include "llvm/MC/MCAssembler.h"
37 #include "llvm/MC/MCContext.h"
38 #include "llvm/MC/MCELFStreamer.h"
39 #include "llvm/MC/MCInst.h"
40 #include "llvm/MC/MCInstBuilder.h"
41 #include "llvm/MC/MCObjectStreamer.h"
42 #include "llvm/MC/MCSectionMachO.h"
43 #include "llvm/MC/MCStreamer.h"
44 #include "llvm/MC/MCSymbol.h"
45 #include "llvm/Support/ARMBuildAttributes.h"
46 #include "llvm/Support/COFF.h"
47 #include "llvm/Support/Debug.h"
48 #include "llvm/Support/ELF.h"
49 #include "llvm/Support/ErrorHandling.h"
50 #include "llvm/Support/TargetParser.h"
51 #include "llvm/Support/TargetRegistry.h"
52 #include "llvm/Support/raw_ostream.h"
53 #include "llvm/Target/TargetMachine.h"
57 #define DEBUG_TYPE "asm-printer"
59 ARMAsmPrinter::ARMAsmPrinter(TargetMachine &TM,
60 std::unique_ptr<MCStreamer> Streamer)
61 : AsmPrinter(TM, std::move(Streamer)), AFI(nullptr), MCP(nullptr),
62 InConstantPool(false), OptimizationGoals(-1) {}
64 void ARMAsmPrinter::EmitFunctionBodyEnd() {
65 // Make sure to terminate any constant pools that were at the end
69 InConstantPool = false;
70 OutStreamer->EmitDataRegion(MCDR_DataRegionEnd);
73 void ARMAsmPrinter::EmitFunctionEntryLabel() {
74 if (AFI->isThumbFunction()) {
75 OutStreamer->EmitAssemblerFlag(MCAF_Code16);
76 OutStreamer->EmitThumbFunc(CurrentFnSym);
78 OutStreamer->EmitAssemblerFlag(MCAF_Code32);
80 OutStreamer->EmitLabel(CurrentFnSym);
83 void ARMAsmPrinter::EmitXXStructor(const DataLayout &DL, const Constant *CV) {
84 uint64_t Size = getDataLayout().getTypeAllocSize(CV->getType());
85 assert(Size && "C++ constructor pointer had zero size!");
87 const GlobalValue *GV = dyn_cast<GlobalValue>(CV->stripPointerCasts());
88 assert(GV && "C++ constructor pointer was not a GlobalValue!");
90 const MCExpr *E = MCSymbolRefExpr::create(GetARMGVSymbol(GV,
92 (Subtarget->isTargetELF()
93 ? MCSymbolRefExpr::VK_ARM_TARGET1
94 : MCSymbolRefExpr::VK_None),
97 OutStreamer->EmitValue(E, Size);
100 void ARMAsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
101 if (PromotedGlobals.count(GV))
102 // The global was promoted into a constant pool. It should not be emitted.
104 AsmPrinter::EmitGlobalVariable(GV);
107 /// runOnMachineFunction - This uses the EmitInstruction()
108 /// method to print assembly for each instruction.
110 bool ARMAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
111 AFI = MF.getInfo<ARMFunctionInfo>();
112 MCP = MF.getConstantPool();
113 Subtarget = &MF.getSubtarget<ARMSubtarget>();
115 SetupMachineFunction(MF);
116 const Function* F = MF.getFunction();
117 const TargetMachine& TM = MF.getTarget();
119 // Collect all globals that had their storage promoted to a constant pool.
120 // Functions are emitted before variables, so this accumulates promoted
121 // globals from all functions in PromotedGlobals.
122 for (auto *GV : AFI->getGlobalsPromotedToConstantPool())
123 PromotedGlobals.insert(GV);
125 // Calculate this function's optimization goal.
126 unsigned OptimizationGoal;
127 if (F->hasFnAttribute(Attribute::OptimizeNone))
128 // For best debugging illusion, speed and small size sacrificed
129 OptimizationGoal = 6;
130 else if (F->optForMinSize())
131 // Aggressively for small size, speed and debug illusion sacrificed
132 OptimizationGoal = 4;
133 else if (F->optForSize())
134 // For small size, but speed and debugging illusion preserved
135 OptimizationGoal = 3;
136 else if (TM.getOptLevel() == CodeGenOpt::Aggressive)
137 // Aggressively for speed, small size and debug illusion sacrificed
138 OptimizationGoal = 2;
139 else if (TM.getOptLevel() > CodeGenOpt::None)
140 // For speed, but small size and good debug illusion preserved
141 OptimizationGoal = 1;
142 else // TM.getOptLevel() == CodeGenOpt::None
143 // For good debugging, but speed and small size preserved
144 OptimizationGoal = 5;
146 // Combine a new optimization goal with existing ones.
147 if (OptimizationGoals == -1) // uninitialized goals
148 OptimizationGoals = OptimizationGoal;
149 else if (OptimizationGoals != (int)OptimizationGoal) // conflicting goals
150 OptimizationGoals = 0;
152 if (Subtarget->isTargetCOFF()) {
153 bool Internal = F->hasInternalLinkage();
154 COFF::SymbolStorageClass Scl = Internal ? COFF::IMAGE_SYM_CLASS_STATIC
155 : COFF::IMAGE_SYM_CLASS_EXTERNAL;
156 int Type = COFF::IMAGE_SYM_DTYPE_FUNCTION << COFF::SCT_COMPLEX_TYPE_SHIFT;
158 OutStreamer->BeginCOFFSymbolDef(CurrentFnSym);
159 OutStreamer->EmitCOFFSymbolStorageClass(Scl);
160 OutStreamer->EmitCOFFSymbolType(Type);
161 OutStreamer->EndCOFFSymbolDef();
164 // Emit the rest of the function body.
167 // Emit the XRay table for this function.
170 // If we need V4T thumb mode Register Indirect Jump pads, emit them.
171 // These are created per function, rather than per TU, since it's
172 // relatively easy to exceed the thumb branch range within a TU.
173 if (! ThumbIndirectPads.empty()) {
174 OutStreamer->EmitAssemblerFlag(MCAF_Code16);
176 for (unsigned i = 0, e = ThumbIndirectPads.size(); i < e; i++) {
177 OutStreamer->EmitLabel(ThumbIndirectPads[i].second);
178 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::tBX)
179 .addReg(ThumbIndirectPads[i].first)
180 // Add predicate operands.
184 ThumbIndirectPads.clear();
187 // We didn't modify anything.
191 void ARMAsmPrinter::printOperand(const MachineInstr *MI, int OpNum,
193 const MachineOperand &MO = MI->getOperand(OpNum);
194 unsigned TF = MO.getTargetFlags();
196 switch (MO.getType()) {
197 default: llvm_unreachable("<unknown operand type>");
198 case MachineOperand::MO_Register: {
199 unsigned Reg = MO.getReg();
200 assert(TargetRegisterInfo::isPhysicalRegister(Reg));
201 assert(!MO.getSubReg() && "Subregs should be eliminated!");
202 if(ARM::GPRPairRegClass.contains(Reg)) {
203 const MachineFunction &MF = *MI->getParent()->getParent();
204 const TargetRegisterInfo *TRI = MF.getSubtarget().getRegisterInfo();
205 Reg = TRI->getSubReg(Reg, ARM::gsub_0);
207 O << ARMInstPrinter::getRegisterName(Reg);
210 case MachineOperand::MO_Immediate: {
211 int64_t Imm = MO.getImm();
213 if (TF == ARMII::MO_LO16)
215 else if (TF == ARMII::MO_HI16)
220 case MachineOperand::MO_MachineBasicBlock:
221 MO.getMBB()->getSymbol()->print(O, MAI);
223 case MachineOperand::MO_GlobalAddress: {
224 const GlobalValue *GV = MO.getGlobal();
225 if (TF & ARMII::MO_LO16)
227 else if (TF & ARMII::MO_HI16)
229 GetARMGVSymbol(GV, TF)->print(O, MAI);
231 printOffset(MO.getOffset(), O);
234 case MachineOperand::MO_ConstantPoolIndex:
235 if (Subtarget->genExecuteOnly())
236 llvm_unreachable("execute-only should not generate constant pools");
237 GetCPISymbol(MO.getIndex())->print(O, MAI);
242 //===--------------------------------------------------------------------===//
244 MCSymbol *ARMAsmPrinter::
245 GetARMJTIPICJumpTableLabel(unsigned uid) const {
246 const DataLayout &DL = getDataLayout();
247 SmallString<60> Name;
248 raw_svector_ostream(Name) << DL.getPrivateGlobalPrefix() << "JTI"
249 << getFunctionNumber() << '_' << uid;
250 return OutContext.getOrCreateSymbol(Name);
253 bool ARMAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNum,
254 unsigned AsmVariant, const char *ExtraCode,
256 // Does this asm operand have a single letter operand modifier?
257 if (ExtraCode && ExtraCode[0]) {
258 if (ExtraCode[1] != 0) return true; // Unknown modifier.
260 switch (ExtraCode[0]) {
262 // See if this is a generic print operand
263 return AsmPrinter::PrintAsmOperand(MI, OpNum, AsmVariant, ExtraCode, O);
264 case 'a': // Print as a memory address.
265 if (MI->getOperand(OpNum).isReg()) {
267 << ARMInstPrinter::getRegisterName(MI->getOperand(OpNum).getReg())
272 case 'c': // Don't print "#" before an immediate operand.
273 if (!MI->getOperand(OpNum).isImm())
275 O << MI->getOperand(OpNum).getImm();
277 case 'P': // Print a VFP double precision register.
278 case 'q': // Print a NEON quad precision register.
279 printOperand(MI, OpNum, O);
281 case 'y': // Print a VFP single precision register as indexed double.
282 if (MI->getOperand(OpNum).isReg()) {
283 unsigned Reg = MI->getOperand(OpNum).getReg();
284 const TargetRegisterInfo *TRI = MF->getSubtarget().getRegisterInfo();
285 // Find the 'd' register that has this 's' register as a sub-register,
286 // and determine the lane number.
287 for (MCSuperRegIterator SR(Reg, TRI); SR.isValid(); ++SR) {
288 if (!ARM::DPRRegClass.contains(*SR))
290 bool Lane0 = TRI->getSubReg(*SR, ARM::ssub_0) == Reg;
291 O << ARMInstPrinter::getRegisterName(*SR) << (Lane0 ? "[0]" : "[1]");
296 case 'B': // Bitwise inverse of integer or symbol without a preceding #.
297 if (!MI->getOperand(OpNum).isImm())
299 O << ~(MI->getOperand(OpNum).getImm());
301 case 'L': // The low 16 bits of an immediate constant.
302 if (!MI->getOperand(OpNum).isImm())
304 O << (MI->getOperand(OpNum).getImm() & 0xffff);
306 case 'M': { // A register range suitable for LDM/STM.
307 if (!MI->getOperand(OpNum).isReg())
309 const MachineOperand &MO = MI->getOperand(OpNum);
310 unsigned RegBegin = MO.getReg();
311 // This takes advantage of the 2 operand-ness of ldm/stm and that we've
312 // already got the operands in registers that are operands to the
313 // inline asm statement.
315 if (ARM::GPRPairRegClass.contains(RegBegin)) {
316 const TargetRegisterInfo *TRI = MF->getSubtarget().getRegisterInfo();
317 unsigned Reg0 = TRI->getSubReg(RegBegin, ARM::gsub_0);
318 O << ARMInstPrinter::getRegisterName(Reg0) << ", ";
319 RegBegin = TRI->getSubReg(RegBegin, ARM::gsub_1);
321 O << ARMInstPrinter::getRegisterName(RegBegin);
323 // FIXME: The register allocator not only may not have given us the
324 // registers in sequence, but may not be in ascending registers. This
325 // will require changes in the register allocator that'll need to be
326 // propagated down here if the operands change.
327 unsigned RegOps = OpNum + 1;
328 while (MI->getOperand(RegOps).isReg()) {
330 << ARMInstPrinter::getRegisterName(MI->getOperand(RegOps).getReg());
338 case 'R': // The most significant register of a pair.
339 case 'Q': { // The least significant register of a pair.
342 const MachineOperand &FlagsOP = MI->getOperand(OpNum - 1);
343 if (!FlagsOP.isImm())
345 unsigned Flags = FlagsOP.getImm();
347 // This operand may not be the one that actually provides the register. If
348 // it's tied to a previous one then we should refer instead to that one
349 // for registers and their classes.
351 if (InlineAsm::isUseOperandTiedToDef(Flags, TiedIdx)) {
352 for (OpNum = InlineAsm::MIOp_FirstOperand; TiedIdx; --TiedIdx) {
353 unsigned OpFlags = MI->getOperand(OpNum).getImm();
354 OpNum += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
356 Flags = MI->getOperand(OpNum).getImm();
358 // Later code expects OpNum to be pointing at the register rather than
363 unsigned NumVals = InlineAsm::getNumOperandRegisters(Flags);
365 InlineAsm::hasRegClassConstraint(Flags, RC);
366 if (RC == ARM::GPRPairRegClassID) {
369 const MachineOperand &MO = MI->getOperand(OpNum);
372 const TargetRegisterInfo *TRI = MF->getSubtarget().getRegisterInfo();
373 unsigned Reg = TRI->getSubReg(MO.getReg(), ExtraCode[0] == 'Q' ?
374 ARM::gsub_0 : ARM::gsub_1);
375 O << ARMInstPrinter::getRegisterName(Reg);
380 unsigned RegOp = ExtraCode[0] == 'Q' ? OpNum : OpNum + 1;
381 if (RegOp >= MI->getNumOperands())
383 const MachineOperand &MO = MI->getOperand(RegOp);
386 unsigned Reg = MO.getReg();
387 O << ARMInstPrinter::getRegisterName(Reg);
391 case 'e': // The low doubleword register of a NEON quad register.
392 case 'f': { // The high doubleword register of a NEON quad register.
393 if (!MI->getOperand(OpNum).isReg())
395 unsigned Reg = MI->getOperand(OpNum).getReg();
396 if (!ARM::QPRRegClass.contains(Reg))
398 const TargetRegisterInfo *TRI = MF->getSubtarget().getRegisterInfo();
399 unsigned SubReg = TRI->getSubReg(Reg, ExtraCode[0] == 'e' ?
400 ARM::dsub_0 : ARM::dsub_1);
401 O << ARMInstPrinter::getRegisterName(SubReg);
405 // This modifier is not yet supported.
406 case 'h': // A range of VFP/NEON registers suitable for VLD1/VST1.
408 case 'H': { // The highest-numbered register of a pair.
409 const MachineOperand &MO = MI->getOperand(OpNum);
412 const MachineFunction &MF = *MI->getParent()->getParent();
413 const TargetRegisterInfo *TRI = MF.getSubtarget().getRegisterInfo();
414 unsigned Reg = MO.getReg();
415 if(!ARM::GPRPairRegClass.contains(Reg))
417 Reg = TRI->getSubReg(Reg, ARM::gsub_1);
418 O << ARMInstPrinter::getRegisterName(Reg);
424 printOperand(MI, OpNum, O);
428 bool ARMAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
429 unsigned OpNum, unsigned AsmVariant,
430 const char *ExtraCode,
432 // Does this asm operand have a single letter operand modifier?
433 if (ExtraCode && ExtraCode[0]) {
434 if (ExtraCode[1] != 0) return true; // Unknown modifier.
436 switch (ExtraCode[0]) {
437 case 'A': // A memory operand for a VLD1/VST1 instruction.
438 default: return true; // Unknown modifier.
439 case 'm': // The base register of a memory operand.
440 if (!MI->getOperand(OpNum).isReg())
442 O << ARMInstPrinter::getRegisterName(MI->getOperand(OpNum).getReg());
447 const MachineOperand &MO = MI->getOperand(OpNum);
448 assert(MO.isReg() && "unexpected inline asm memory operand");
449 O << "[" << ARMInstPrinter::getRegisterName(MO.getReg()) << "]";
453 static bool isThumb(const MCSubtargetInfo& STI) {
454 return STI.getFeatureBits()[ARM::ModeThumb];
457 void ARMAsmPrinter::emitInlineAsmEnd(const MCSubtargetInfo &StartInfo,
458 const MCSubtargetInfo *EndInfo) const {
459 // If either end mode is unknown (EndInfo == NULL) or different than
460 // the start mode, then restore the start mode.
461 const bool WasThumb = isThumb(StartInfo);
462 if (!EndInfo || WasThumb != isThumb(*EndInfo)) {
463 OutStreamer->EmitAssemblerFlag(WasThumb ? MCAF_Code16 : MCAF_Code32);
467 void ARMAsmPrinter::EmitStartOfAsmFile(Module &M) {
468 const Triple &TT = TM.getTargetTriple();
469 // Use unified assembler syntax.
470 OutStreamer->EmitAssemblerFlag(MCAF_SyntaxUnified);
472 // Emit ARM Build Attributes
473 if (TT.isOSBinFormatELF())
476 // Use the triple's architecture and subarchitecture to determine
477 // if we're thumb for the purposes of the top level code16 assembler
479 bool isThumb = TT.getArch() == Triple::thumb ||
480 TT.getArch() == Triple::thumbeb ||
481 TT.getSubArch() == Triple::ARMSubArch_v7m ||
482 TT.getSubArch() == Triple::ARMSubArch_v6m;
483 if (!M.getModuleInlineAsm().empty() && isThumb)
484 OutStreamer->EmitAssemblerFlag(MCAF_Code16);
488 emitNonLazySymbolPointer(MCStreamer &OutStreamer, MCSymbol *StubLabel,
489 MachineModuleInfoImpl::StubValueTy &MCSym) {
491 OutStreamer.EmitLabel(StubLabel);
492 // .indirect_symbol _foo
493 OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
496 // External to current translation unit.
497 OutStreamer.EmitIntValue(0, 4/*size*/);
499 // Internal to current translation unit.
501 // When we place the LSDA into the TEXT section, the type info
502 // pointers need to be indirect and pc-rel. We accomplish this by
503 // using NLPs; however, sometimes the types are local to the file.
504 // We need to fill in the value for the NLP in those cases.
505 OutStreamer.EmitValue(
506 MCSymbolRefExpr::create(MCSym.getPointer(), OutStreamer.getContext()),
511 void ARMAsmPrinter::EmitEndOfAsmFile(Module &M) {
512 const Triple &TT = TM.getTargetTriple();
513 if (TT.isOSBinFormatMachO()) {
514 // All darwin targets use mach-o.
515 const TargetLoweringObjectFileMachO &TLOFMacho =
516 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
517 MachineModuleInfoMachO &MMIMacho =
518 MMI->getObjFileInfo<MachineModuleInfoMachO>();
520 // Output non-lazy-pointers for external and common global variables.
521 MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetGVStubList();
523 if (!Stubs.empty()) {
524 // Switch with ".non_lazy_symbol_pointer" directive.
525 OutStreamer->SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
528 for (auto &Stub : Stubs)
529 emitNonLazySymbolPointer(*OutStreamer, Stub.first, Stub.second);
532 OutStreamer->AddBlankLine();
535 Stubs = MMIMacho.GetThreadLocalGVStubList();
536 if (!Stubs.empty()) {
537 // Switch with ".non_lazy_symbol_pointer" directive.
538 OutStreamer->SwitchSection(TLOFMacho.getThreadLocalPointerSection());
541 for (auto &Stub : Stubs)
542 emitNonLazySymbolPointer(*OutStreamer, Stub.first, Stub.second);
545 OutStreamer->AddBlankLine();
548 // Funny Darwin hack: This flag tells the linker that no global symbols
549 // contain code that falls through to other global symbols (e.g. the obvious
550 // implementation of multiple entry points). If this doesn't occur, the
551 // linker can safely perform dead code stripping. Since LLVM never
552 // generates code that does this, it is always safe to set.
553 OutStreamer->EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
556 if (TT.isOSBinFormatCOFF()) {
558 static_cast<const TargetLoweringObjectFileCOFF &>(getObjFileLowering());
561 raw_string_ostream OS(Flags);
563 for (const auto &Function : M)
564 TLOF.emitLinkerFlagsForGlobal(OS, &Function);
565 for (const auto &Global : M.globals())
566 TLOF.emitLinkerFlagsForGlobal(OS, &Global);
567 for (const auto &Alias : M.aliases())
568 TLOF.emitLinkerFlagsForGlobal(OS, &Alias);
572 // Output collected flags
573 if (!Flags.empty()) {
574 OutStreamer->SwitchSection(TLOF.getDrectveSection());
575 OutStreamer->EmitBytes(Flags);
579 // The last attribute to be emitted is ABI_optimization_goals
580 MCTargetStreamer &TS = *OutStreamer->getTargetStreamer();
581 ARMTargetStreamer &ATS = static_cast<ARMTargetStreamer &>(TS);
583 if (OptimizationGoals > 0 &&
584 (Subtarget->isTargetAEABI() || Subtarget->isTargetGNUAEABI() ||
585 Subtarget->isTargetMuslAEABI()))
586 ATS.emitAttribute(ARMBuildAttrs::ABI_optimization_goals, OptimizationGoals);
587 OptimizationGoals = -1;
589 ATS.finishAttributeSection();
592 static bool isV8M(const ARMSubtarget *Subtarget) {
593 // Note that v8M Baseline is a subset of v6T2!
594 return (Subtarget->hasV8MBaselineOps() && !Subtarget->hasV6T2Ops()) ||
595 Subtarget->hasV8MMainlineOps();
598 //===----------------------------------------------------------------------===//
599 // Helper routines for EmitStartOfAsmFile() and EmitEndOfAsmFile()
601 // The following seem like one-off assembler flags, but they actually need
602 // to appear in the .ARM.attributes section in ELF.
603 // Instead of subclassing the MCELFStreamer, we do the work here.
605 static ARMBuildAttrs::CPUArch getArchForCPU(StringRef CPU,
606 const ARMSubtarget *Subtarget) {
608 return ARMBuildAttrs::v5TEJ;
610 if (Subtarget->hasV8Ops()) {
611 if (Subtarget->isRClass())
612 return ARMBuildAttrs::v8_R;
613 return ARMBuildAttrs::v8_A;
614 } else if (Subtarget->hasV8MMainlineOps())
615 return ARMBuildAttrs::v8_M_Main;
616 else if (Subtarget->hasV7Ops()) {
617 if (Subtarget->isMClass() && Subtarget->hasDSP())
618 return ARMBuildAttrs::v7E_M;
619 return ARMBuildAttrs::v7;
620 } else if (Subtarget->hasV6T2Ops())
621 return ARMBuildAttrs::v6T2;
622 else if (Subtarget->hasV8MBaselineOps())
623 return ARMBuildAttrs::v8_M_Base;
624 else if (Subtarget->hasV6MOps())
625 return ARMBuildAttrs::v6S_M;
626 else if (Subtarget->hasV6Ops())
627 return ARMBuildAttrs::v6;
628 else if (Subtarget->hasV5TEOps())
629 return ARMBuildAttrs::v5TE;
630 else if (Subtarget->hasV5TOps())
631 return ARMBuildAttrs::v5T;
632 else if (Subtarget->hasV4TOps())
633 return ARMBuildAttrs::v4T;
635 return ARMBuildAttrs::v4;
638 // Returns true if all functions have the same function attribute value.
639 // It also returns true when the module has no functions.
640 static bool checkFunctionsAttributeConsistency(const Module &M, StringRef Attr,
642 return !any_of(M, [&](const Function &F) {
643 return F.getFnAttribute(Attr).getValueAsString() != Value;
647 void ARMAsmPrinter::emitAttributes() {
648 MCTargetStreamer &TS = *OutStreamer->getTargetStreamer();
649 ARMTargetStreamer &ATS = static_cast<ARMTargetStreamer &>(TS);
651 ATS.emitTextAttribute(ARMBuildAttrs::conformance, "2.09");
653 ATS.switchVendor("aeabi");
655 // Compute ARM ELF Attributes based on the default subtarget that
656 // we'd have constructed. The existing ARM behavior isn't LTO clean
658 // FIXME: For ifunc related functions we could iterate over and look
659 // for a feature string that doesn't match the default one.
660 const Triple &TT = TM.getTargetTriple();
661 StringRef CPU = TM.getTargetCPU();
662 StringRef FS = TM.getTargetFeatureString();
663 std::string ArchFS = ARM_MC::ParseARMTriple(TT, CPU);
666 ArchFS = (Twine(ArchFS) + "," + FS).str();
670 const ARMBaseTargetMachine &ATM =
671 static_cast<const ARMBaseTargetMachine &>(TM);
672 const ARMSubtarget STI(TT, CPU, ArchFS, ATM, ATM.isLittleEndian());
674 const std::string &CPUString = STI.getCPUString();
676 if (!StringRef(CPUString).startswith("generic")) {
677 // FIXME: remove krait check when GNU tools support krait cpu
679 ATS.emitTextAttribute(ARMBuildAttrs::CPU_name, "cortex-a9");
680 // We consider krait as a "cortex-a9" + hwdiv CPU
681 // Enable hwdiv through ".arch_extension idiv"
682 if (STI.hasDivide() || STI.hasDivideInARMMode())
683 ATS.emitArchExtension(ARM::AEK_HWDIV | ARM::AEK_HWDIVARM);
685 ATS.emitTextAttribute(ARMBuildAttrs::CPU_name, CPUString);
688 ATS.emitAttribute(ARMBuildAttrs::CPU_arch, getArchForCPU(CPUString, &STI));
690 // Tag_CPU_arch_profile must have the default value of 0 when "Architecture
691 // profile is not applicable (e.g. pre v7, or cross-profile code)".
692 if (STI.hasV7Ops() || isV8M(&STI)) {
693 if (STI.isAClass()) {
694 ATS.emitAttribute(ARMBuildAttrs::CPU_arch_profile,
695 ARMBuildAttrs::ApplicationProfile);
696 } else if (STI.isRClass()) {
697 ATS.emitAttribute(ARMBuildAttrs::CPU_arch_profile,
698 ARMBuildAttrs::RealTimeProfile);
699 } else if (STI.isMClass()) {
700 ATS.emitAttribute(ARMBuildAttrs::CPU_arch_profile,
701 ARMBuildAttrs::MicroControllerProfile);
705 ATS.emitAttribute(ARMBuildAttrs::ARM_ISA_use,
706 STI.hasARMOps() ? ARMBuildAttrs::Allowed
707 : ARMBuildAttrs::Not_Allowed);
709 ATS.emitAttribute(ARMBuildAttrs::THUMB_ISA_use,
710 ARMBuildAttrs::AllowThumbDerived);
711 } else if (STI.isThumb1Only()) {
712 ATS.emitAttribute(ARMBuildAttrs::THUMB_ISA_use, ARMBuildAttrs::Allowed);
713 } else if (STI.hasThumb2()) {
714 ATS.emitAttribute(ARMBuildAttrs::THUMB_ISA_use,
715 ARMBuildAttrs::AllowThumb32);
719 /* NEON is not exactly a VFP architecture, but GAS emit one of
720 * neon/neon-fp-armv8/neon-vfpv4/vfpv3/vfpv2 for .fpu parameters */
721 if (STI.hasFPARMv8()) {
723 ATS.emitFPU(ARM::FK_CRYPTO_NEON_FP_ARMV8);
725 ATS.emitFPU(ARM::FK_NEON_FP_ARMV8);
726 } else if (STI.hasVFP4())
727 ATS.emitFPU(ARM::FK_NEON_VFPV4);
729 ATS.emitFPU(STI.hasFP16() ? ARM::FK_NEON_FP16 : ARM::FK_NEON);
730 // Emit Tag_Advanced_SIMD_arch for ARMv8 architecture
732 ATS.emitAttribute(ARMBuildAttrs::Advanced_SIMD_arch,
733 STI.hasV8_1aOps() ? ARMBuildAttrs::AllowNeonARMv8_1a:
734 ARMBuildAttrs::AllowNeonARMv8);
736 if (STI.hasFPARMv8())
737 // FPv5 and FP-ARMv8 have the same instructions, so are modeled as one
738 // FPU, but there are two different names for it depending on the CPU.
739 ATS.emitFPU(STI.hasD16()
740 ? (STI.isFPOnlySP() ? ARM::FK_FPV5_SP_D16 : ARM::FK_FPV5_D16)
742 else if (STI.hasVFP4())
743 ATS.emitFPU(STI.hasD16()
744 ? (STI.isFPOnlySP() ? ARM::FK_FPV4_SP_D16 : ARM::FK_VFPV4_D16)
746 else if (STI.hasVFP3())
747 ATS.emitFPU(STI.hasD16()
750 ? (STI.hasFP16() ? ARM::FK_VFPV3XD_FP16 : ARM::FK_VFPV3XD)
751 : (STI.hasFP16() ? ARM::FK_VFPV3_D16_FP16 : ARM::FK_VFPV3_D16))
753 : (STI.hasFP16() ? ARM::FK_VFPV3_FP16 : ARM::FK_VFPV3));
754 else if (STI.hasVFP2())
755 ATS.emitFPU(ARM::FK_VFPV2);
758 // RW data addressing.
759 if (isPositionIndependent()) {
760 ATS.emitAttribute(ARMBuildAttrs::ABI_PCS_RW_data,
761 ARMBuildAttrs::AddressRWPCRel);
762 } else if (STI.isRWPI()) {
763 // RWPI specific attributes.
764 ATS.emitAttribute(ARMBuildAttrs::ABI_PCS_RW_data,
765 ARMBuildAttrs::AddressRWSBRel);
768 // RO data addressing.
769 if (isPositionIndependent() || STI.isROPI()) {
770 ATS.emitAttribute(ARMBuildAttrs::ABI_PCS_RO_data,
771 ARMBuildAttrs::AddressROPCRel);
775 if (isPositionIndependent()) {
776 ATS.emitAttribute(ARMBuildAttrs::ABI_PCS_GOT_use,
777 ARMBuildAttrs::AddressGOT);
779 ATS.emitAttribute(ARMBuildAttrs::ABI_PCS_GOT_use,
780 ARMBuildAttrs::AddressDirect);
784 if (checkFunctionsAttributeConsistency(*MMI->getModule(),
787 TM.Options.FPDenormalMode == FPDenormal::PreserveSign)
788 ATS.emitAttribute(ARMBuildAttrs::ABI_FP_denormal,
789 ARMBuildAttrs::PreserveFPSign);
790 else if (checkFunctionsAttributeConsistency(*MMI->getModule(),
793 TM.Options.FPDenormalMode == FPDenormal::PositiveZero)
794 ATS.emitAttribute(ARMBuildAttrs::ABI_FP_denormal,
795 ARMBuildAttrs::PositiveZero);
796 else if (!TM.Options.UnsafeFPMath)
797 ATS.emitAttribute(ARMBuildAttrs::ABI_FP_denormal,
798 ARMBuildAttrs::IEEEDenormals);
800 if (!STI.hasVFP2()) {
801 // When the target doesn't have an FPU (by design or
802 // intention), the assumptions made on the software support
803 // mirror that of the equivalent hardware support *if it
804 // existed*. For v7 and better we indicate that denormals are
805 // flushed preserving sign, and for V6 we indicate that
806 // denormals are flushed to positive zero.
808 ATS.emitAttribute(ARMBuildAttrs::ABI_FP_denormal,
809 ARMBuildAttrs::PreserveFPSign);
810 } else if (STI.hasVFP3()) {
811 // In VFPv4, VFPv4U, VFPv3, or VFPv3U, it is preserved. That is,
812 // the sign bit of the zero matches the sign bit of the input or
813 // result that is being flushed to zero.
814 ATS.emitAttribute(ARMBuildAttrs::ABI_FP_denormal,
815 ARMBuildAttrs::PreserveFPSign);
817 // For VFPv2 implementations it is implementation defined as
818 // to whether denormals are flushed to positive zero or to
819 // whatever the sign of zero is (ARM v7AR ARM 2.7.5). Historically
820 // LLVM has chosen to flush this to positive zero (most likely for
821 // GCC compatibility), so that's the chosen value here (the
822 // absence of its emission implies zero).
825 // Set FP exceptions and rounding
826 if (checkFunctionsAttributeConsistency(*MMI->getModule(),
827 "no-trapping-math", "true") ||
828 TM.Options.NoTrappingFPMath)
829 ATS.emitAttribute(ARMBuildAttrs::ABI_FP_exceptions,
830 ARMBuildAttrs::Not_Allowed);
831 else if (!TM.Options.UnsafeFPMath) {
832 ATS.emitAttribute(ARMBuildAttrs::ABI_FP_exceptions, ARMBuildAttrs::Allowed);
834 // If the user has permitted this code to choose the IEEE 754
835 // rounding at run-time, emit the rounding attribute.
836 if (TM.Options.HonorSignDependentRoundingFPMathOption)
837 ATS.emitAttribute(ARMBuildAttrs::ABI_FP_rounding, ARMBuildAttrs::Allowed);
840 // TM.Options.NoInfsFPMath && TM.Options.NoNaNsFPMath is the
841 // equivalent of GCC's -ffinite-math-only flag.
842 if (TM.Options.NoInfsFPMath && TM.Options.NoNaNsFPMath)
843 ATS.emitAttribute(ARMBuildAttrs::ABI_FP_number_model,
844 ARMBuildAttrs::Allowed);
846 ATS.emitAttribute(ARMBuildAttrs::ABI_FP_number_model,
847 ARMBuildAttrs::AllowIEE754);
849 if (STI.allowsUnalignedMem())
850 ATS.emitAttribute(ARMBuildAttrs::CPU_unaligned_access,
851 ARMBuildAttrs::Allowed);
853 ATS.emitAttribute(ARMBuildAttrs::CPU_unaligned_access,
854 ARMBuildAttrs::Not_Allowed);
856 // FIXME: add more flags to ARMBuildAttributes.h
857 // 8-bytes alignment stuff.
858 ATS.emitAttribute(ARMBuildAttrs::ABI_align_needed, 1);
859 ATS.emitAttribute(ARMBuildAttrs::ABI_align_preserved, 1);
861 // ABI_HardFP_use attribute to indicate single precision FP.
862 if (STI.isFPOnlySP())
863 ATS.emitAttribute(ARMBuildAttrs::ABI_HardFP_use,
864 ARMBuildAttrs::HardFPSinglePrecision);
866 // Hard float. Use both S and D registers and conform to AAPCS-VFP.
867 if (STI.isAAPCS_ABI() && TM.Options.FloatABIType == FloatABI::Hard)
868 ATS.emitAttribute(ARMBuildAttrs::ABI_VFP_args, ARMBuildAttrs::HardFPAAPCS);
870 // FIXME: Should we signal R9 usage?
873 ATS.emitAttribute(ARMBuildAttrs::FP_HP_extension, ARMBuildAttrs::AllowHPFP);
875 // FIXME: To support emitting this build attribute as GCC does, the
876 // -mfp16-format option and associated plumbing must be
877 // supported. For now the __fp16 type is exposed by default, so this
878 // attribute should be emitted with value 1.
879 ATS.emitAttribute(ARMBuildAttrs::ABI_FP_16bit_format,
880 ARMBuildAttrs::FP16FormatIEEE);
882 if (STI.hasMPExtension())
883 ATS.emitAttribute(ARMBuildAttrs::MPextension_use, ARMBuildAttrs::AllowMP);
885 // Hardware divide in ARM mode is part of base arch, starting from ARMv8.
886 // If only Thumb hwdiv is present, it must also be in base arch (ARMv7-R/M).
887 // It is not possible to produce DisallowDIV: if hwdiv is present in the base
888 // arch, supplying -hwdiv downgrades the effective arch, via ClearImpliedBits.
889 // AllowDIVExt is only emitted if hwdiv isn't available in the base arch;
890 // otherwise, the default value (AllowDIVIfExists) applies.
891 if (STI.hasDivideInARMMode() && !STI.hasV8Ops())
892 ATS.emitAttribute(ARMBuildAttrs::DIV_use, ARMBuildAttrs::AllowDIVExt);
894 if (STI.hasDSP() && isV8M(&STI))
895 ATS.emitAttribute(ARMBuildAttrs::DSP_extension, ARMBuildAttrs::Allowed);
898 if (const Module *SourceModule = MMI->getModule()) {
899 // ABI_PCS_wchar_t to indicate wchar_t width
900 // FIXME: There is no way to emit value 0 (wchar_t prohibited).
901 if (auto WCharWidthValue = mdconst::extract_or_null<ConstantInt>(
902 SourceModule->getModuleFlag("wchar_size"))) {
903 int WCharWidth = WCharWidthValue->getZExtValue();
904 assert((WCharWidth == 2 || WCharWidth == 4) &&
905 "wchar_t width must be 2 or 4 bytes");
906 ATS.emitAttribute(ARMBuildAttrs::ABI_PCS_wchar_t, WCharWidth);
909 // ABI_enum_size to indicate enum width
910 // FIXME: There is no way to emit value 0 (enums prohibited) or value 3
911 // (all enums contain a value needing 32 bits to encode).
912 if (auto EnumWidthValue = mdconst::extract_or_null<ConstantInt>(
913 SourceModule->getModuleFlag("min_enum_size"))) {
914 int EnumWidth = EnumWidthValue->getZExtValue();
915 assert((EnumWidth == 1 || EnumWidth == 4) &&
916 "Minimum enum width must be 1 or 4 bytes");
917 int EnumBuildAttr = EnumWidth == 1 ? 1 : 2;
918 ATS.emitAttribute(ARMBuildAttrs::ABI_enum_size, EnumBuildAttr);
923 // We currently do not support using R9 as the TLS pointer.
925 ATS.emitAttribute(ARMBuildAttrs::ABI_PCS_R9_use,
926 ARMBuildAttrs::R9IsSB);
927 else if (STI.isR9Reserved())
928 ATS.emitAttribute(ARMBuildAttrs::ABI_PCS_R9_use,
929 ARMBuildAttrs::R9Reserved);
931 ATS.emitAttribute(ARMBuildAttrs::ABI_PCS_R9_use,
932 ARMBuildAttrs::R9IsGPR);
934 if (STI.hasTrustZone() && STI.hasVirtualization())
935 ATS.emitAttribute(ARMBuildAttrs::Virtualization_use,
936 ARMBuildAttrs::AllowTZVirtualization);
937 else if (STI.hasTrustZone())
938 ATS.emitAttribute(ARMBuildAttrs::Virtualization_use,
939 ARMBuildAttrs::AllowTZ);
940 else if (STI.hasVirtualization())
941 ATS.emitAttribute(ARMBuildAttrs::Virtualization_use,
942 ARMBuildAttrs::AllowVirtualization);
945 //===----------------------------------------------------------------------===//
947 static MCSymbol *getPICLabel(StringRef Prefix, unsigned FunctionNumber,
948 unsigned LabelId, MCContext &Ctx) {
950 MCSymbol *Label = Ctx.getOrCreateSymbol(Twine(Prefix)
951 + "PC" + Twine(FunctionNumber) + "_" + Twine(LabelId));
955 static MCSymbolRefExpr::VariantKind
956 getModifierVariantKind(ARMCP::ARMCPModifier Modifier) {
958 case ARMCP::no_modifier:
959 return MCSymbolRefExpr::VK_None;
961 return MCSymbolRefExpr::VK_TLSGD;
963 return MCSymbolRefExpr::VK_TPOFF;
964 case ARMCP::GOTTPOFF:
965 return MCSymbolRefExpr::VK_GOTTPOFF;
967 return MCSymbolRefExpr::VK_ARM_SBREL;
968 case ARMCP::GOT_PREL:
969 return MCSymbolRefExpr::VK_ARM_GOT_PREL;
971 return MCSymbolRefExpr::VK_SECREL;
973 llvm_unreachable("Invalid ARMCPModifier!");
976 MCSymbol *ARMAsmPrinter::GetARMGVSymbol(const GlobalValue *GV,
977 unsigned char TargetFlags) {
978 if (Subtarget->isTargetMachO()) {
980 (TargetFlags & ARMII::MO_NONLAZY) && Subtarget->isGVIndirectSymbol(GV);
983 return getSymbol(GV);
985 // FIXME: Remove this when Darwin transition to @GOT like syntax.
986 MCSymbol *MCSym = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
987 MachineModuleInfoMachO &MMIMachO =
988 MMI->getObjFileInfo<MachineModuleInfoMachO>();
989 MachineModuleInfoImpl::StubValueTy &StubSym =
990 GV->isThreadLocal() ? MMIMachO.getThreadLocalGVStubEntry(MCSym)
991 : MMIMachO.getGVStubEntry(MCSym);
993 if (!StubSym.getPointer())
994 StubSym = MachineModuleInfoImpl::StubValueTy(getSymbol(GV),
995 !GV->hasInternalLinkage());
997 } else if (Subtarget->isTargetCOFF()) {
998 assert(Subtarget->isTargetWindows() &&
999 "Windows is the only supported COFF target");
1001 bool IsIndirect = (TargetFlags & ARMII::MO_DLLIMPORT);
1003 return getSymbol(GV);
1005 SmallString<128> Name;
1007 getNameWithPrefix(Name, GV);
1009 return OutContext.getOrCreateSymbol(Name);
1010 } else if (Subtarget->isTargetELF()) {
1011 return getSymbol(GV);
1013 llvm_unreachable("unexpected target");
1016 void ARMAsmPrinter::
1017 EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1018 const DataLayout &DL = getDataLayout();
1019 int Size = DL.getTypeAllocSize(MCPV->getType());
1021 ARMConstantPoolValue *ACPV = static_cast<ARMConstantPoolValue*>(MCPV);
1023 if (ACPV->isPromotedGlobal()) {
1024 // This constant pool entry is actually a global whose storage has been
1025 // promoted into the constant pool. This global may be referenced still
1026 // by debug information, and due to the way AsmPrinter is set up, the debug
1027 // info is immutable by the time we decide to promote globals to constant
1028 // pools. Because of this, we need to ensure we emit a symbol for the global
1029 // with private linkage (the default) so debug info can refer to it.
1031 // However, if this global is promoted into several functions we must ensure
1032 // we don't try and emit duplicate symbols!
1033 auto *ACPC = cast<ARMConstantPoolConstant>(ACPV);
1034 auto *GV = ACPC->getPromotedGlobal();
1035 if (!EmittedPromotedGlobalLabels.count(GV)) {
1036 MCSymbol *GVSym = getSymbol(GV);
1037 OutStreamer->EmitLabel(GVSym);
1038 EmittedPromotedGlobalLabels.insert(GV);
1040 return EmitGlobalConstant(DL, ACPC->getPromotedGlobalInit());
1044 if (ACPV->isLSDA()) {
1045 MCSym = getCurExceptionSym();
1046 } else if (ACPV->isBlockAddress()) {
1047 const BlockAddress *BA =
1048 cast<ARMConstantPoolConstant>(ACPV)->getBlockAddress();
1049 MCSym = GetBlockAddressSymbol(BA);
1050 } else if (ACPV->isGlobalValue()) {
1051 const GlobalValue *GV = cast<ARMConstantPoolConstant>(ACPV)->getGV();
1053 // On Darwin, const-pool entries may get the "FOO$non_lazy_ptr" mangling, so
1054 // flag the global as MO_NONLAZY.
1055 unsigned char TF = Subtarget->isTargetMachO() ? ARMII::MO_NONLAZY : 0;
1056 MCSym = GetARMGVSymbol(GV, TF);
1057 } else if (ACPV->isMachineBasicBlock()) {
1058 const MachineBasicBlock *MBB = cast<ARMConstantPoolMBB>(ACPV)->getMBB();
1059 MCSym = MBB->getSymbol();
1061 assert(ACPV->isExtSymbol() && "unrecognized constant pool value");
1062 auto Sym = cast<ARMConstantPoolSymbol>(ACPV)->getSymbol();
1063 MCSym = GetExternalSymbolSymbol(Sym);
1066 // Create an MCSymbol for the reference.
1067 const MCExpr *Expr =
1068 MCSymbolRefExpr::create(MCSym, getModifierVariantKind(ACPV->getModifier()),
1071 if (ACPV->getPCAdjustment()) {
1073 getPICLabel(DL.getPrivateGlobalPrefix(), getFunctionNumber(),
1074 ACPV->getLabelId(), OutContext);
1075 const MCExpr *PCRelExpr = MCSymbolRefExpr::create(PCLabel, OutContext);
1077 MCBinaryExpr::createAdd(PCRelExpr,
1078 MCConstantExpr::create(ACPV->getPCAdjustment(),
1081 if (ACPV->mustAddCurrentAddress()) {
1082 // We want "(<expr> - .)", but MC doesn't have a concept of the '.'
1083 // label, so just emit a local label end reference that instead.
1084 MCSymbol *DotSym = OutContext.createTempSymbol();
1085 OutStreamer->EmitLabel(DotSym);
1086 const MCExpr *DotExpr = MCSymbolRefExpr::create(DotSym, OutContext);
1087 PCRelExpr = MCBinaryExpr::createSub(PCRelExpr, DotExpr, OutContext);
1089 Expr = MCBinaryExpr::createSub(Expr, PCRelExpr, OutContext);
1091 OutStreamer->EmitValue(Expr, Size);
1094 void ARMAsmPrinter::EmitJumpTableAddrs(const MachineInstr *MI) {
1095 const MachineOperand &MO1 = MI->getOperand(1);
1096 unsigned JTI = MO1.getIndex();
1098 // Make sure the Thumb jump table is 4-byte aligned. This will be a nop for
1102 // Emit a label for the jump table.
1103 MCSymbol *JTISymbol = GetARMJTIPICJumpTableLabel(JTI);
1104 OutStreamer->EmitLabel(JTISymbol);
1106 // Mark the jump table as data-in-code.
1107 OutStreamer->EmitDataRegion(MCDR_DataRegionJT32);
1109 // Emit each entry of the table.
1110 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
1111 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
1112 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
1114 for (unsigned i = 0, e = JTBBs.size(); i != e; ++i) {
1115 MachineBasicBlock *MBB = JTBBs[i];
1116 // Construct an MCExpr for the entry. We want a value of the form:
1117 // (BasicBlockAddr - TableBeginAddr)
1119 // For example, a table with entries jumping to basic blocks BB0 and BB1
1122 // .word (LBB0 - LJTI_0_0)
1123 // .word (LBB1 - LJTI_0_0)
1124 const MCExpr *Expr = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
1126 if (isPositionIndependent() || Subtarget->isROPI())
1127 Expr = MCBinaryExpr::createSub(Expr, MCSymbolRefExpr::create(JTISymbol,
1130 // If we're generating a table of Thumb addresses in static relocation
1131 // model, we need to add one to keep interworking correctly.
1132 else if (AFI->isThumbFunction())
1133 Expr = MCBinaryExpr::createAdd(Expr, MCConstantExpr::create(1,OutContext),
1135 OutStreamer->EmitValue(Expr, 4);
1137 // Mark the end of jump table data-in-code region.
1138 OutStreamer->EmitDataRegion(MCDR_DataRegionEnd);
1141 void ARMAsmPrinter::EmitJumpTableInsts(const MachineInstr *MI) {
1142 const MachineOperand &MO1 = MI->getOperand(1);
1143 unsigned JTI = MO1.getIndex();
1145 MCSymbol *JTISymbol = GetARMJTIPICJumpTableLabel(JTI);
1146 OutStreamer->EmitLabel(JTISymbol);
1148 // Emit each entry of the table.
1149 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
1150 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
1151 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
1153 for (unsigned i = 0, e = JTBBs.size(); i != e; ++i) {
1154 MachineBasicBlock *MBB = JTBBs[i];
1155 const MCExpr *MBBSymbolExpr = MCSymbolRefExpr::create(MBB->getSymbol(),
1157 // If this isn't a TBB or TBH, the entries are direct branch instructions.
1158 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::t2B)
1159 .addExpr(MBBSymbolExpr)
1165 void ARMAsmPrinter::EmitJumpTableTBInst(const MachineInstr *MI,
1166 unsigned OffsetWidth) {
1167 assert((OffsetWidth == 1 || OffsetWidth == 2) && "invalid tbb/tbh width");
1168 const MachineOperand &MO1 = MI->getOperand(1);
1169 unsigned JTI = MO1.getIndex();
1171 if (Subtarget->isThumb1Only())
1174 MCSymbol *JTISymbol = GetARMJTIPICJumpTableLabel(JTI);
1175 OutStreamer->EmitLabel(JTISymbol);
1177 // Emit each entry of the table.
1178 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
1179 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
1180 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
1182 // Mark the jump table as data-in-code.
1183 OutStreamer->EmitDataRegion(OffsetWidth == 1 ? MCDR_DataRegionJT8
1184 : MCDR_DataRegionJT16);
1186 for (auto MBB : JTBBs) {
1187 const MCExpr *MBBSymbolExpr = MCSymbolRefExpr::create(MBB->getSymbol(),
1189 // Otherwise it's an offset from the dispatch instruction. Construct an
1190 // MCExpr for the entry. We want a value of the form:
1191 // (BasicBlockAddr - TBBInstAddr + 4) / 2
1193 // For example, a TBB table with entries jumping to basic blocks BB0 and BB1
1196 // .byte (LBB0 - (LCPI0_0 + 4)) / 2
1197 // .byte (LBB1 - (LCPI0_0 + 4)) / 2
1198 // where LCPI0_0 is a label defined just before the TBB instruction using
1200 MCSymbol *TBInstPC = GetCPISymbol(MI->getOperand(0).getImm());
1201 const MCExpr *Expr = MCBinaryExpr::createAdd(
1202 MCSymbolRefExpr::create(TBInstPC, OutContext),
1203 MCConstantExpr::create(4, OutContext), OutContext);
1204 Expr = MCBinaryExpr::createSub(MBBSymbolExpr, Expr, OutContext);
1205 Expr = MCBinaryExpr::createDiv(Expr, MCConstantExpr::create(2, OutContext),
1207 OutStreamer->EmitValue(Expr, OffsetWidth);
1209 // Mark the end of jump table data-in-code region. 32-bit offsets use
1210 // actual branch instructions here, so we don't mark those as a data-region
1212 OutStreamer->EmitDataRegion(MCDR_DataRegionEnd);
1214 // Make sure the next instruction is 2-byte aligned.
1218 void ARMAsmPrinter::EmitUnwindingInstruction(const MachineInstr *MI) {
1219 assert(MI->getFlag(MachineInstr::FrameSetup) &&
1220 "Only instruction which are involved into frame setup code are allowed");
1222 MCTargetStreamer &TS = *OutStreamer->getTargetStreamer();
1223 ARMTargetStreamer &ATS = static_cast<ARMTargetStreamer &>(TS);
1224 const MachineFunction &MF = *MI->getParent()->getParent();
1225 const TargetRegisterInfo *RegInfo = MF.getSubtarget().getRegisterInfo();
1226 const ARMFunctionInfo &AFI = *MF.getInfo<ARMFunctionInfo>();
1228 unsigned FramePtr = RegInfo->getFrameRegister(MF);
1229 unsigned Opc = MI->getOpcode();
1230 unsigned SrcReg, DstReg;
1232 if (Opc == ARM::tPUSH || Opc == ARM::tLDRpci) {
1233 // Two special cases:
1234 // 1) tPUSH does not have src/dst regs.
1235 // 2) for Thumb1 code we sometimes materialize the constant via constpool
1236 // load. Yes, this is pretty fragile, but for now I don't see better
1238 SrcReg = DstReg = ARM::SP;
1240 SrcReg = MI->getOperand(1).getReg();
1241 DstReg = MI->getOperand(0).getReg();
1244 // Try to figure out the unwinding opcode out of src / dst regs.
1245 if (MI->mayStore()) {
1247 assert(DstReg == ARM::SP &&
1248 "Only stack pointer as a destination reg is supported");
1250 SmallVector<unsigned, 4> RegList;
1251 // Skip src & dst reg, and pred ops.
1252 unsigned StartOp = 2 + 2;
1253 // Use all the operands.
1254 unsigned NumOffset = 0;
1259 llvm_unreachable("Unsupported opcode for unwinding information");
1261 // Special case here: no src & dst reg, but two extra imp ops.
1262 StartOp = 2; NumOffset = 2;
1263 case ARM::STMDB_UPD:
1264 case ARM::t2STMDB_UPD:
1265 case ARM::VSTMDDB_UPD:
1266 assert(SrcReg == ARM::SP &&
1267 "Only stack pointer as a source reg is supported");
1268 for (unsigned i = StartOp, NumOps = MI->getNumOperands() - NumOffset;
1270 const MachineOperand &MO = MI->getOperand(i);
1271 // Actually, there should never be any impdef stuff here. Skip it
1272 // temporary to workaround PR11902.
1273 if (MO.isImplicit())
1275 RegList.push_back(MO.getReg());
1278 case ARM::STR_PRE_IMM:
1279 case ARM::STR_PRE_REG:
1280 case ARM::t2STR_PRE:
1281 assert(MI->getOperand(2).getReg() == ARM::SP &&
1282 "Only stack pointer as a source reg is supported");
1283 RegList.push_back(SrcReg);
1286 if (MAI->getExceptionHandlingType() == ExceptionHandling::ARM)
1287 ATS.emitRegSave(RegList, Opc == ARM::VSTMDDB_UPD);
1289 // Changes of stack / frame pointer.
1290 if (SrcReg == ARM::SP) {
1295 llvm_unreachable("Unsupported opcode for unwinding information");
1302 Offset = -MI->getOperand(2).getImm();
1306 Offset = MI->getOperand(2).getImm();
1309 Offset = MI->getOperand(2).getImm()*4;
1313 Offset = -MI->getOperand(2).getImm()*4;
1315 case ARM::tLDRpci: {
1316 // Grab the constpool index and check, whether it corresponds to
1317 // original or cloned constpool entry.
1318 unsigned CPI = MI->getOperand(1).getIndex();
1319 const MachineConstantPool *MCP = MF.getConstantPool();
1320 if (CPI >= MCP->getConstants().size())
1321 CPI = AFI.getOriginalCPIdx(CPI);
1322 assert(CPI != -1U && "Invalid constpool index");
1324 // Derive the actual offset.
1325 const MachineConstantPoolEntry &CPE = MCP->getConstants()[CPI];
1326 assert(!CPE.isMachineConstantPoolEntry() && "Invalid constpool entry");
1327 // FIXME: Check for user, it should be "add" instruction!
1328 Offset = -cast<ConstantInt>(CPE.Val.ConstVal)->getSExtValue();
1333 if (MAI->getExceptionHandlingType() == ExceptionHandling::ARM) {
1334 if (DstReg == FramePtr && FramePtr != ARM::SP)
1335 // Set-up of the frame pointer. Positive values correspond to "add"
1337 ATS.emitSetFP(FramePtr, ARM::SP, -Offset);
1338 else if (DstReg == ARM::SP) {
1339 // Change of SP by an offset. Positive values correspond to "sub"
1341 ATS.emitPad(Offset);
1343 // Move of SP to a register. Positive values correspond to an "add"
1345 ATS.emitMovSP(DstReg, -Offset);
1348 } else if (DstReg == ARM::SP) {
1350 llvm_unreachable("Unsupported opcode for unwinding information");
1354 llvm_unreachable("Unsupported opcode for unwinding information");
1359 // Simple pseudo-instructions have their lowering (with expansion to real
1360 // instructions) auto-generated.
1361 #include "ARMGenMCPseudoLowering.inc"
1363 void ARMAsmPrinter::EmitInstruction(const MachineInstr *MI) {
1364 const DataLayout &DL = getDataLayout();
1365 MCTargetStreamer &TS = *OutStreamer->getTargetStreamer();
1366 ARMTargetStreamer &ATS = static_cast<ARMTargetStreamer &>(TS);
1368 // If we just ended a constant pool, mark it as such.
1369 if (InConstantPool && MI->getOpcode() != ARM::CONSTPOOL_ENTRY) {
1370 OutStreamer->EmitDataRegion(MCDR_DataRegionEnd);
1371 InConstantPool = false;
1374 // Emit unwinding stuff for frame-related instructions
1375 if (Subtarget->isTargetEHABICompatible() &&
1376 MI->getFlag(MachineInstr::FrameSetup))
1377 EmitUnwindingInstruction(MI);
1379 // Do any auto-generated pseudo lowerings.
1380 if (emitPseudoExpansionLowering(*OutStreamer, MI))
1383 assert(!convertAddSubFlagsOpcode(MI->getOpcode()) &&
1384 "Pseudo flag setting opcode should be expanded early");
1386 // Check for manual lowerings.
1387 unsigned Opc = MI->getOpcode();
1389 case ARM::t2MOVi32imm: llvm_unreachable("Should be lowered by thumb2it pass");
1390 case ARM::DBG_VALUE: llvm_unreachable("Should be handled by generic printing");
1392 case ARM::tLEApcrel:
1393 case ARM::t2LEApcrel: {
1394 // FIXME: Need to also handle globals and externals
1395 MCSymbol *CPISymbol = GetCPISymbol(MI->getOperand(1).getIndex());
1396 EmitToStreamer(*OutStreamer, MCInstBuilder(MI->getOpcode() ==
1397 ARM::t2LEApcrel ? ARM::t2ADR
1398 : (MI->getOpcode() == ARM::tLEApcrel ? ARM::tADR
1400 .addReg(MI->getOperand(0).getReg())
1401 .addExpr(MCSymbolRefExpr::create(CPISymbol, OutContext))
1402 // Add predicate operands.
1403 .addImm(MI->getOperand(2).getImm())
1404 .addReg(MI->getOperand(3).getReg()));
1407 case ARM::LEApcrelJT:
1408 case ARM::tLEApcrelJT:
1409 case ARM::t2LEApcrelJT: {
1410 MCSymbol *JTIPICSymbol =
1411 GetARMJTIPICJumpTableLabel(MI->getOperand(1).getIndex());
1412 EmitToStreamer(*OutStreamer, MCInstBuilder(MI->getOpcode() ==
1413 ARM::t2LEApcrelJT ? ARM::t2ADR
1414 : (MI->getOpcode() == ARM::tLEApcrelJT ? ARM::tADR
1416 .addReg(MI->getOperand(0).getReg())
1417 .addExpr(MCSymbolRefExpr::create(JTIPICSymbol, OutContext))
1418 // Add predicate operands.
1419 .addImm(MI->getOperand(2).getImm())
1420 .addReg(MI->getOperand(3).getReg()));
1423 // Darwin call instructions are just normal call instructions with different
1424 // clobber semantics (they clobber R9).
1425 case ARM::BX_CALL: {
1426 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::MOVr)
1429 // Add predicate operands.
1432 // Add 's' bit operand (always reg0 for this)
1435 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::BX)
1436 .addReg(MI->getOperand(0).getReg()));
1439 case ARM::tBX_CALL: {
1440 if (Subtarget->hasV5TOps())
1441 llvm_unreachable("Expected BLX to be selected for v5t+");
1443 // On ARM v4t, when doing a call from thumb mode, we need to ensure
1444 // that the saved lr has its LSB set correctly (the arch doesn't
1446 // So here we generate a bl to a small jump pad that does bx rN.
1447 // The jump pads are emitted after the function body.
1449 unsigned TReg = MI->getOperand(0).getReg();
1450 MCSymbol *TRegSym = nullptr;
1451 for (unsigned i = 0, e = ThumbIndirectPads.size(); i < e; i++) {
1452 if (ThumbIndirectPads[i].first == TReg) {
1453 TRegSym = ThumbIndirectPads[i].second;
1459 TRegSym = OutContext.createTempSymbol();
1460 ThumbIndirectPads.push_back(std::make_pair(TReg, TRegSym));
1463 // Create a link-saving branch to the Reg Indirect Jump Pad.
1464 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::tBL)
1465 // Predicate comes first here.
1466 .addImm(ARMCC::AL).addReg(0)
1467 .addExpr(MCSymbolRefExpr::create(TRegSym, OutContext)));
1470 case ARM::BMOVPCRX_CALL: {
1471 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::MOVr)
1474 // Add predicate operands.
1477 // Add 's' bit operand (always reg0 for this)
1480 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::MOVr)
1482 .addReg(MI->getOperand(0).getReg())
1483 // Add predicate operands.
1486 // Add 's' bit operand (always reg0 for this)
1490 case ARM::BMOVPCB_CALL: {
1491 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::MOVr)
1494 // Add predicate operands.
1497 // Add 's' bit operand (always reg0 for this)
1500 const MachineOperand &Op = MI->getOperand(0);
1501 const GlobalValue *GV = Op.getGlobal();
1502 const unsigned TF = Op.getTargetFlags();
1503 MCSymbol *GVSym = GetARMGVSymbol(GV, TF);
1504 const MCExpr *GVSymExpr = MCSymbolRefExpr::create(GVSym, OutContext);
1505 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::Bcc)
1507 // Add predicate operands.
1512 case ARM::MOVi16_ga_pcrel:
1513 case ARM::t2MOVi16_ga_pcrel: {
1515 TmpInst.setOpcode(Opc == ARM::MOVi16_ga_pcrel? ARM::MOVi16 : ARM::t2MOVi16);
1516 TmpInst.addOperand(MCOperand::createReg(MI->getOperand(0).getReg()));
1518 unsigned TF = MI->getOperand(1).getTargetFlags();
1519 const GlobalValue *GV = MI->getOperand(1).getGlobal();
1520 MCSymbol *GVSym = GetARMGVSymbol(GV, TF);
1521 const MCExpr *GVSymExpr = MCSymbolRefExpr::create(GVSym, OutContext);
1523 MCSymbol *LabelSym =
1524 getPICLabel(DL.getPrivateGlobalPrefix(), getFunctionNumber(),
1525 MI->getOperand(2).getImm(), OutContext);
1526 const MCExpr *LabelSymExpr= MCSymbolRefExpr::create(LabelSym, OutContext);
1527 unsigned PCAdj = (Opc == ARM::MOVi16_ga_pcrel) ? 8 : 4;
1528 const MCExpr *PCRelExpr =
1529 ARMMCExpr::createLower16(MCBinaryExpr::createSub(GVSymExpr,
1530 MCBinaryExpr::createAdd(LabelSymExpr,
1531 MCConstantExpr::create(PCAdj, OutContext),
1532 OutContext), OutContext), OutContext);
1533 TmpInst.addOperand(MCOperand::createExpr(PCRelExpr));
1535 // Add predicate operands.
1536 TmpInst.addOperand(MCOperand::createImm(ARMCC::AL));
1537 TmpInst.addOperand(MCOperand::createReg(0));
1538 // Add 's' bit operand (always reg0 for this)
1539 TmpInst.addOperand(MCOperand::createReg(0));
1540 EmitToStreamer(*OutStreamer, TmpInst);
1543 case ARM::MOVTi16_ga_pcrel:
1544 case ARM::t2MOVTi16_ga_pcrel: {
1546 TmpInst.setOpcode(Opc == ARM::MOVTi16_ga_pcrel
1547 ? ARM::MOVTi16 : ARM::t2MOVTi16);
1548 TmpInst.addOperand(MCOperand::createReg(MI->getOperand(0).getReg()));
1549 TmpInst.addOperand(MCOperand::createReg(MI->getOperand(1).getReg()));
1551 unsigned TF = MI->getOperand(2).getTargetFlags();
1552 const GlobalValue *GV = MI->getOperand(2).getGlobal();
1553 MCSymbol *GVSym = GetARMGVSymbol(GV, TF);
1554 const MCExpr *GVSymExpr = MCSymbolRefExpr::create(GVSym, OutContext);
1556 MCSymbol *LabelSym =
1557 getPICLabel(DL.getPrivateGlobalPrefix(), getFunctionNumber(),
1558 MI->getOperand(3).getImm(), OutContext);
1559 const MCExpr *LabelSymExpr= MCSymbolRefExpr::create(LabelSym, OutContext);
1560 unsigned PCAdj = (Opc == ARM::MOVTi16_ga_pcrel) ? 8 : 4;
1561 const MCExpr *PCRelExpr =
1562 ARMMCExpr::createUpper16(MCBinaryExpr::createSub(GVSymExpr,
1563 MCBinaryExpr::createAdd(LabelSymExpr,
1564 MCConstantExpr::create(PCAdj, OutContext),
1565 OutContext), OutContext), OutContext);
1566 TmpInst.addOperand(MCOperand::createExpr(PCRelExpr));
1567 // Add predicate operands.
1568 TmpInst.addOperand(MCOperand::createImm(ARMCC::AL));
1569 TmpInst.addOperand(MCOperand::createReg(0));
1570 // Add 's' bit operand (always reg0 for this)
1571 TmpInst.addOperand(MCOperand::createReg(0));
1572 EmitToStreamer(*OutStreamer, TmpInst);
1575 case ARM::tPICADD: {
1576 // This is a pseudo op for a label + instruction sequence, which looks like:
1579 // This adds the address of LPC0 to r0.
1582 OutStreamer->EmitLabel(getPICLabel(DL.getPrivateGlobalPrefix(),
1583 getFunctionNumber(),
1584 MI->getOperand(2).getImm(), OutContext));
1586 // Form and emit the add.
1587 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::tADDhirr)
1588 .addReg(MI->getOperand(0).getReg())
1589 .addReg(MI->getOperand(0).getReg())
1591 // Add predicate operands.
1597 // This is a pseudo op for a label + instruction sequence, which looks like:
1600 // This adds the address of LPC0 to r0.
1603 OutStreamer->EmitLabel(getPICLabel(DL.getPrivateGlobalPrefix(),
1604 getFunctionNumber(),
1605 MI->getOperand(2).getImm(), OutContext));
1607 // Form and emit the add.
1608 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::ADDrr)
1609 .addReg(MI->getOperand(0).getReg())
1611 .addReg(MI->getOperand(1).getReg())
1612 // Add predicate operands.
1613 .addImm(MI->getOperand(3).getImm())
1614 .addReg(MI->getOperand(4).getReg())
1615 // Add 's' bit operand (always reg0 for this)
1626 case ARM::PICLDRSH: {
1627 // This is a pseudo op for a label + instruction sequence, which looks like:
1630 // The LCP0 label is referenced by a constant pool entry in order to get
1631 // a PC-relative address at the ldr instruction.
1634 OutStreamer->EmitLabel(getPICLabel(DL.getPrivateGlobalPrefix(),
1635 getFunctionNumber(),
1636 MI->getOperand(2).getImm(), OutContext));
1638 // Form and emit the load
1640 switch (MI->getOpcode()) {
1642 llvm_unreachable("Unexpected opcode!");
1643 case ARM::PICSTR: Opcode = ARM::STRrs; break;
1644 case ARM::PICSTRB: Opcode = ARM::STRBrs; break;
1645 case ARM::PICSTRH: Opcode = ARM::STRH; break;
1646 case ARM::PICLDR: Opcode = ARM::LDRrs; break;
1647 case ARM::PICLDRB: Opcode = ARM::LDRBrs; break;
1648 case ARM::PICLDRH: Opcode = ARM::LDRH; break;
1649 case ARM::PICLDRSB: Opcode = ARM::LDRSB; break;
1650 case ARM::PICLDRSH: Opcode = ARM::LDRSH; break;
1652 EmitToStreamer(*OutStreamer, MCInstBuilder(Opcode)
1653 .addReg(MI->getOperand(0).getReg())
1655 .addReg(MI->getOperand(1).getReg())
1657 // Add predicate operands.
1658 .addImm(MI->getOperand(3).getImm())
1659 .addReg(MI->getOperand(4).getReg()));
1663 case ARM::CONSTPOOL_ENTRY: {
1664 /// CONSTPOOL_ENTRY - This instruction represents a floating constant pool
1665 /// in the function. The first operand is the ID# for this instruction, the
1666 /// second is the index into the MachineConstantPool that this is, the third
1667 /// is the size in bytes of this constant pool entry.
1668 /// The required alignment is specified on the basic block holding this MI.
1669 unsigned LabelId = (unsigned)MI->getOperand(0).getImm();
1670 unsigned CPIdx = (unsigned)MI->getOperand(1).getIndex();
1672 // If this is the first entry of the pool, mark it.
1673 if (!InConstantPool) {
1674 OutStreamer->EmitDataRegion(MCDR_DataRegion);
1675 InConstantPool = true;
1678 OutStreamer->EmitLabel(GetCPISymbol(LabelId));
1680 const MachineConstantPoolEntry &MCPE = MCP->getConstants()[CPIdx];
1681 if (MCPE.isMachineConstantPoolEntry())
1682 EmitMachineConstantPoolValue(MCPE.Val.MachineCPVal);
1684 EmitGlobalConstant(DL, MCPE.Val.ConstVal);
1687 case ARM::JUMPTABLE_ADDRS:
1688 EmitJumpTableAddrs(MI);
1690 case ARM::JUMPTABLE_INSTS:
1691 EmitJumpTableInsts(MI);
1693 case ARM::JUMPTABLE_TBB:
1694 case ARM::JUMPTABLE_TBH:
1695 EmitJumpTableTBInst(MI, MI->getOpcode() == ARM::JUMPTABLE_TBB ? 1 : 2);
1697 case ARM::t2BR_JT: {
1698 // Lower and emit the instruction itself, then the jump table following it.
1699 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::tMOVr)
1701 .addReg(MI->getOperand(0).getReg())
1702 // Add predicate operands.
1708 case ARM::t2TBH_JT: {
1709 unsigned Opc = MI->getOpcode() == ARM::t2TBB_JT ? ARM::t2TBB : ARM::t2TBH;
1710 // Lower and emit the PC label, then the instruction itself.
1711 OutStreamer->EmitLabel(GetCPISymbol(MI->getOperand(3).getImm()));
1712 EmitToStreamer(*OutStreamer, MCInstBuilder(Opc)
1713 .addReg(MI->getOperand(0).getReg())
1714 .addReg(MI->getOperand(1).getReg())
1715 // Add predicate operands.
1721 case ARM::tTBH_JT: {
1723 bool Is8Bit = MI->getOpcode() == ARM::tTBB_JT;
1724 unsigned Base = MI->getOperand(0).getReg();
1725 unsigned Idx = MI->getOperand(1).getReg();
1726 assert(MI->getOperand(1).isKill() && "We need the index register as scratch!");
1728 // Multiply up idx if necessary.
1730 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::tLSLri)
1735 // Add predicate operands.
1739 if (Base == ARM::PC) {
1740 // TBB [base, idx] =
1741 // ADDS idx, idx, base
1742 // LDRB idx, [idx, #4] ; or LDRH if TBH
1746 // When using PC as the base, it's important that there is no padding
1747 // between the last ADDS and the start of the jump table. The jump table
1748 // is 4-byte aligned, so we ensure we're 4 byte aligned here too.
1750 // FIXME: Ideally we could vary the LDRB index based on the padding
1751 // between the sequence and jump table, however that relies on MCExprs
1752 // for load indexes which are currently not supported.
1753 OutStreamer->EmitCodeAlignment(4);
1754 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::tADDhirr)
1758 // Add predicate operands.
1762 unsigned Opc = Is8Bit ? ARM::tLDRBi : ARM::tLDRHi;
1763 EmitToStreamer(*OutStreamer, MCInstBuilder(Opc)
1766 .addImm(Is8Bit ? 4 : 2)
1767 // Add predicate operands.
1771 // TBB [base, idx] =
1772 // LDRB idx, [base, idx] ; or LDRH if TBH
1776 unsigned Opc = Is8Bit ? ARM::tLDRBr : ARM::tLDRHr;
1777 EmitToStreamer(*OutStreamer, MCInstBuilder(Opc)
1781 // Add predicate operands.
1786 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::tLSLri)
1791 // Add predicate operands.
1795 OutStreamer->EmitLabel(GetCPISymbol(MI->getOperand(3).getImm()));
1796 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::tADDhirr)
1800 // Add predicate operands.
1807 // Lower and emit the instruction itself, then the jump table following it.
1810 unsigned Opc = MI->getOpcode() == ARM::BR_JTr ?
1811 ARM::MOVr : ARM::tMOVr;
1812 TmpInst.setOpcode(Opc);
1813 TmpInst.addOperand(MCOperand::createReg(ARM::PC));
1814 TmpInst.addOperand(MCOperand::createReg(MI->getOperand(0).getReg()));
1815 // Add predicate operands.
1816 TmpInst.addOperand(MCOperand::createImm(ARMCC::AL));
1817 TmpInst.addOperand(MCOperand::createReg(0));
1818 // Add 's' bit operand (always reg0 for this)
1819 if (Opc == ARM::MOVr)
1820 TmpInst.addOperand(MCOperand::createReg(0));
1821 EmitToStreamer(*OutStreamer, TmpInst);
1825 // Lower and emit the instruction itself, then the jump table following it.
1828 if (MI->getOperand(1).getReg() == 0) {
1830 TmpInst.setOpcode(ARM::LDRi12);
1831 TmpInst.addOperand(MCOperand::createReg(ARM::PC));
1832 TmpInst.addOperand(MCOperand::createReg(MI->getOperand(0).getReg()));
1833 TmpInst.addOperand(MCOperand::createImm(MI->getOperand(2).getImm()));
1835 TmpInst.setOpcode(ARM::LDRrs);
1836 TmpInst.addOperand(MCOperand::createReg(ARM::PC));
1837 TmpInst.addOperand(MCOperand::createReg(MI->getOperand(0).getReg()));
1838 TmpInst.addOperand(MCOperand::createReg(MI->getOperand(1).getReg()));
1839 TmpInst.addOperand(MCOperand::createImm(0));
1841 // Add predicate operands.
1842 TmpInst.addOperand(MCOperand::createImm(ARMCC::AL));
1843 TmpInst.addOperand(MCOperand::createReg(0));
1844 EmitToStreamer(*OutStreamer, TmpInst);
1847 case ARM::BR_JTadd: {
1848 // Lower and emit the instruction itself, then the jump table following it.
1849 // add pc, target, idx
1850 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::ADDrr)
1852 .addReg(MI->getOperand(0).getReg())
1853 .addReg(MI->getOperand(1).getReg())
1854 // Add predicate operands.
1857 // Add 's' bit operand (always reg0 for this)
1862 OutStreamer->EmitZeros(MI->getOperand(1).getImm());
1865 // Non-Darwin binutils don't yet support the "trap" mnemonic.
1866 // FIXME: Remove this special case when they do.
1867 if (!Subtarget->isTargetMachO()) {
1868 uint32_t Val = 0xe7ffdefeUL;
1869 OutStreamer->AddComment("trap");
1875 case ARM::TRAPNaCl: {
1876 uint32_t Val = 0xe7fedef0UL;
1877 OutStreamer->AddComment("trap");
1882 // Non-Darwin binutils don't yet support the "trap" mnemonic.
1883 // FIXME: Remove this special case when they do.
1884 if (!Subtarget->isTargetMachO()) {
1885 uint16_t Val = 0xdefe;
1886 OutStreamer->AddComment("trap");
1887 ATS.emitInst(Val, 'n');
1892 case ARM::t2Int_eh_sjlj_setjmp:
1893 case ARM::t2Int_eh_sjlj_setjmp_nofp:
1894 case ARM::tInt_eh_sjlj_setjmp: {
1895 // Two incoming args: GPR:$src, GPR:$val
1898 // str $val, [$src, #4]
1903 unsigned SrcReg = MI->getOperand(0).getReg();
1904 unsigned ValReg = MI->getOperand(1).getReg();
1905 MCSymbol *Label = OutContext.createTempSymbol("SJLJEH", false, true);
1906 OutStreamer->AddComment("eh_setjmp begin");
1907 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::tMOVr)
1914 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::tADDi3)
1924 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::tSTRi)
1927 // The offset immediate is #4. The operand value is scaled by 4 for the
1928 // tSTR instruction.
1934 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::tMOVi8)
1942 const MCExpr *SymbolExpr = MCSymbolRefExpr::create(Label, OutContext);
1943 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::tB)
1944 .addExpr(SymbolExpr)
1948 OutStreamer->AddComment("eh_setjmp end");
1949 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::tMOVi8)
1957 OutStreamer->EmitLabel(Label);
1961 case ARM::Int_eh_sjlj_setjmp_nofp:
1962 case ARM::Int_eh_sjlj_setjmp: {
1963 // Two incoming args: GPR:$src, GPR:$val
1965 // str $val, [$src, #+4]
1969 unsigned SrcReg = MI->getOperand(0).getReg();
1970 unsigned ValReg = MI->getOperand(1).getReg();
1972 OutStreamer->AddComment("eh_setjmp begin");
1973 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::ADDri)
1980 // 's' bit operand (always reg0 for this).
1983 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::STRi12)
1991 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::MOVi)
1997 // 's' bit operand (always reg0 for this).
2000 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::ADDri)
2007 // 's' bit operand (always reg0 for this).
2010 OutStreamer->AddComment("eh_setjmp end");
2011 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::MOVi)
2017 // 's' bit operand (always reg0 for this).
2021 case ARM::Int_eh_sjlj_longjmp: {
2022 // ldr sp, [$src, #8]
2023 // ldr $scratch, [$src, #4]
2026 unsigned SrcReg = MI->getOperand(0).getReg();
2027 unsigned ScratchReg = MI->getOperand(1).getReg();
2028 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::LDRi12)
2036 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::LDRi12)
2044 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::LDRi12)
2052 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::BX)
2059 case ARM::tInt_eh_sjlj_longjmp: {
2060 // ldr $scratch, [$src, #8]
2062 // ldr $scratch, [$src, #4]
2065 unsigned SrcReg = MI->getOperand(0).getReg();
2066 unsigned ScratchReg = MI->getOperand(1).getReg();
2068 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::tLDRi)
2071 // The offset immediate is #8. The operand value is scaled by 4 for the
2072 // tLDR instruction.
2078 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::tMOVr)
2085 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::tLDRi)
2093 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::tLDRi)
2101 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::tBX)
2108 case ARM::tInt_WIN_eh_sjlj_longjmp: {
2109 // ldr.w r11, [$src, #0]
2110 // ldr.w sp, [$src, #8]
2111 // ldr.w pc, [$src, #4]
2113 unsigned SrcReg = MI->getOperand(0).getReg();
2115 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::t2LDRi12)
2122 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::t2LDRi12)
2129 EmitToStreamer(*OutStreamer, MCInstBuilder(ARM::t2LDRi12)
2138 case ARM::PATCHABLE_FUNCTION_ENTER:
2139 LowerPATCHABLE_FUNCTION_ENTER(*MI);
2141 case ARM::PATCHABLE_FUNCTION_EXIT:
2142 LowerPATCHABLE_FUNCTION_EXIT(*MI);
2144 case ARM::PATCHABLE_TAIL_CALL:
2145 LowerPATCHABLE_TAIL_CALL(*MI);
2150 LowerARMMachineInstrToMCInst(MI, TmpInst, *this);
2152 EmitToStreamer(*OutStreamer, TmpInst);
2155 //===----------------------------------------------------------------------===//
2156 // Target Registry Stuff
2157 //===----------------------------------------------------------------------===//
2159 // Force static initialization.
2160 extern "C" void LLVMInitializeARMAsmPrinter() {
2161 RegisterAsmPrinter<ARMAsmPrinter> X(getTheARMLETarget());
2162 RegisterAsmPrinter<ARMAsmPrinter> Y(getTheARMBETarget());
2163 RegisterAsmPrinter<ARMAsmPrinter> A(getTheThumbLETarget());
2164 RegisterAsmPrinter<ARMAsmPrinter> B(getTheThumbBETarget());