1 //===-- ARMAsmPrinter.cpp - ARM LLVM assembly writer ----------------------===//
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 #define DEBUG_TYPE "asm-printer"
17 #include "ARMTargetMachine.h"
18 #include "ARMAddressingModes.h"
19 #include "ARMConstantPoolValue.h"
20 #include "ARMMachineFunctionInfo.h"
21 #include "llvm/Constants.h"
22 #include "llvm/Module.h"
23 #include "llvm/CodeGen/AsmPrinter.h"
24 #include "llvm/CodeGen/DwarfWriter.h"
25 #include "llvm/CodeGen/MachineModuleInfo.h"
26 #include "llvm/CodeGen/MachineFunctionPass.h"
27 #include "llvm/CodeGen/MachineJumpTableInfo.h"
28 #include "llvm/Target/TargetAsmInfo.h"
29 #include "llvm/Target/TargetData.h"
30 #include "llvm/Target/TargetMachine.h"
31 #include "llvm/Target/TargetOptions.h"
32 #include "llvm/ADT/Statistic.h"
33 #include "llvm/ADT/StringExtras.h"
34 #include "llvm/ADT/StringSet.h"
35 #include "llvm/Support/Compiler.h"
36 #include "llvm/Support/Mangler.h"
37 #include "llvm/Support/MathExtras.h"
38 #include "llvm/Support/raw_ostream.h"
42 STATISTIC(EmittedInsts, "Number of machine instrs printed");
45 struct VISIBILITY_HIDDEN ARMAsmPrinter : public AsmPrinter {
46 ARMAsmPrinter(raw_ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
47 : AsmPrinter(O, TM, T), DW(0), MMI(NULL), AFI(NULL), MCP(NULL),
49 Subtarget = &TM.getSubtarget<ARMSubtarget>();
53 MachineModuleInfo *MMI;
55 /// Subtarget - Keep a pointer to the ARMSubtarget around so that we can
56 /// make the right decision when printing asm code for different targets.
57 const ARMSubtarget *Subtarget;
59 /// AFI - Keep a pointer to ARMFunctionInfo for the current
63 /// MCP - Keep a pointer to constantpool entries of the current
65 const MachineConstantPool *MCP;
67 /// We name each basic block in a Function with a unique number, so
68 /// that we can consistently refer to them later. This is cleared
69 /// at the beginning of each call to runOnMachineFunction().
71 typedef std::map<const Value *, unsigned> ValueMapTy;
72 ValueMapTy NumberForBB;
74 /// GVNonLazyPtrs - Keeps the set of GlobalValues that require
75 /// non-lazy-pointers for indirect access.
76 StringSet<> GVNonLazyPtrs;
78 /// HiddenGVNonLazyPtrs - Keeps the set of GlobalValues with hidden
79 /// visibility that require non-lazy-pointers for indirect access.
80 StringSet<> HiddenGVNonLazyPtrs;
82 /// FnStubs - Keeps the set of external function GlobalAddresses that the
83 /// asm printer should generate stubs for.
86 /// True if asm printer is printing a series of CONSTPOOL_ENTRY.
89 virtual const char *getPassName() const {
90 return "ARM Assembly Printer";
93 void printOperand(const MachineInstr *MI, int opNum,
94 const char *Modifier = 0);
95 void printSOImmOperand(const MachineInstr *MI, int opNum);
96 void printSOImm2PartOperand(const MachineInstr *MI, int opNum);
97 void printSORegOperand(const MachineInstr *MI, int opNum);
98 void printAddrMode2Operand(const MachineInstr *MI, int OpNo);
99 void printAddrMode2OffsetOperand(const MachineInstr *MI, int OpNo);
100 void printAddrMode3Operand(const MachineInstr *MI, int OpNo);
101 void printAddrMode3OffsetOperand(const MachineInstr *MI, int OpNo);
102 void printAddrMode4Operand(const MachineInstr *MI, int OpNo,
103 const char *Modifier = 0);
104 void printAddrMode5Operand(const MachineInstr *MI, int OpNo,
105 const char *Modifier = 0);
106 void printAddrModePCOperand(const MachineInstr *MI, int OpNo,
107 const char *Modifier = 0);
108 void printThumbAddrModeRROperand(const MachineInstr *MI, int OpNo);
109 void printThumbAddrModeRI5Operand(const MachineInstr *MI, int OpNo,
111 void printThumbAddrModeS1Operand(const MachineInstr *MI, int OpNo);
112 void printThumbAddrModeS2Operand(const MachineInstr *MI, int OpNo);
113 void printThumbAddrModeS4Operand(const MachineInstr *MI, int OpNo);
114 void printThumbAddrModeSPOperand(const MachineInstr *MI, int OpNo);
115 void printPredicateOperand(const MachineInstr *MI, int opNum);
116 void printSBitModifierOperand(const MachineInstr *MI, int opNum);
117 void printPCLabel(const MachineInstr *MI, int opNum);
118 void printRegisterList(const MachineInstr *MI, int opNum);
119 void printCPInstOperand(const MachineInstr *MI, int opNum,
120 const char *Modifier);
121 void printJTBlockOperand(const MachineInstr *MI, int opNum);
123 virtual bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
124 unsigned AsmVariant, const char *ExtraCode);
126 void printModuleLevelGV(const GlobalVariable* GVar);
127 bool printInstruction(const MachineInstr *MI); // autogenerated.
128 void printMachineInstruction(const MachineInstr *MI);
129 bool runOnMachineFunction(MachineFunction &F);
130 bool doInitialization(Module &M);
131 bool doFinalization(Module &M);
133 /// EmitMachineConstantPoolValue - Print a machine constantpool value to
135 virtual void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
136 printDataDirective(MCPV->getType());
138 ARMConstantPoolValue *ACPV = static_cast<ARMConstantPoolValue*>(MCPV);
139 GlobalValue *GV = ACPV->getGV();
140 std::string Name = GV ? Mang->getValueName(GV) : TAI->getGlobalPrefix();
142 Name += ACPV->getSymbol();
143 if (ACPV->isNonLazyPointer()) {
144 if (GV->hasHiddenVisibility())
145 HiddenGVNonLazyPtrs.insert(Name);
147 GVNonLazyPtrs.insert(Name);
148 printSuffixedName(Name, "$non_lazy_ptr");
149 } else if (ACPV->isStub()) {
150 FnStubs.insert(Name);
151 printSuffixedName(Name, "$stub");
154 if (ACPV->hasModifier()) O << "(" << ACPV->getModifier() << ")";
155 if (ACPV->getPCAdjustment() != 0) {
156 O << "-(" << TAI->getPrivateGlobalPrefix() << "PC"
157 << utostr(ACPV->getLabelId())
158 << "+" << (unsigned)ACPV->getPCAdjustment();
159 if (ACPV->mustAddCurrentAddress())
165 // If the constant pool value is a extern weak symbol, remember to emit
166 // the weak reference.
167 if (GV && GV->hasExternalWeakLinkage())
168 ExtWeakSymbols.insert(GV);
171 void getAnalysisUsage(AnalysisUsage &AU) const {
172 AsmPrinter::getAnalysisUsage(AU);
173 AU.setPreservesAll();
174 AU.addRequired<MachineModuleInfo>();
175 AU.addRequired<DwarfWriter>();
178 } // end of anonymous namespace
180 #include "ARMGenAsmWriter.inc"
182 /// runOnMachineFunction - This uses the printInstruction()
183 /// method to print assembly for each instruction.
185 bool ARMAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
186 AFI = MF.getInfo<ARMFunctionInfo>();
187 MCP = MF.getConstantPool();
189 SetupMachineFunction(MF);
192 // NOTE: we don't print out constant pools here, they are handled as
196 // Print out labels for the function.
197 const Function *F = MF.getFunction();
198 switch (F->getLinkage()) {
199 default: assert(0 && "Unknown linkage type!");
200 case Function::InternalLinkage:
201 SwitchToTextSection("\t.text", F);
203 case Function::ExternalLinkage:
204 SwitchToTextSection("\t.text", F);
205 O << "\t.globl\t" << CurrentFnName << "\n";
207 case Function::WeakLinkage:
208 case Function::LinkOnceLinkage:
209 if (Subtarget->isTargetDarwin()) {
211 ".section __TEXT,__textcoal_nt,coalesced,pure_instructions", F);
212 O << "\t.globl\t" << CurrentFnName << "\n";
213 O << "\t.weak_definition\t" << CurrentFnName << "\n";
215 O << TAI->getWeakRefDirective() << CurrentFnName << "\n";
220 printVisibility(CurrentFnName, F->getVisibility());
222 if (AFI->isThumbFunction()) {
223 EmitAlignment(1, F, AFI->getAlign());
224 O << "\t.code\t16\n";
225 O << "\t.thumb_func";
226 if (Subtarget->isTargetDarwin())
227 O << "\t" << CurrentFnName;
233 O << CurrentFnName << ":\n";
234 // Emit pre-function debug information.
235 DW->BeginFunction(&MF);
237 if (Subtarget->isTargetDarwin()) {
238 // If the function is empty, then we need to emit *something*. Otherwise,
239 // the function's label might be associated with something that it wasn't
240 // meant to be associated with. We emit a noop in this situation.
241 MachineFunction::iterator I = MF.begin();
243 if (++I == MF.end() && MF.front().empty())
247 // Print out code for the function.
248 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
250 // Print a label for the basic block.
251 if (I != MF.begin()) {
252 printBasicBlockLabel(I, true, true);
255 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
257 // Print the assembly for the instruction.
258 printMachineInstruction(II);
262 if (TAI->hasDotTypeDotSizeDirective())
263 O << "\t.size " << CurrentFnName << ", .-" << CurrentFnName << "\n";
265 // Emit post-function debug information.
266 DW->EndFunction(&MF);
273 void ARMAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
274 const char *Modifier) {
275 const MachineOperand &MO = MI->getOperand(opNum);
276 switch (MO.getType()) {
277 case MachineOperand::MO_Register:
278 if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
279 O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
281 assert(0 && "not implemented");
283 case MachineOperand::MO_Immediate: {
284 if (!Modifier || strcmp(Modifier, "no_hash") != 0)
287 O << (int)MO.getImm();
290 case MachineOperand::MO_MachineBasicBlock:
291 printBasicBlockLabel(MO.getMBB());
293 case MachineOperand::MO_GlobalAddress: {
294 bool isCallOp = Modifier && !strcmp(Modifier, "call");
295 GlobalValue *GV = MO.getGlobal();
296 std::string Name = Mang->getValueName(GV);
297 bool isExt = (GV->isDeclaration() || GV->hasWeakLinkage() ||
298 GV->hasLinkOnceLinkage());
299 if (isExt && isCallOp && Subtarget->isTargetDarwin() &&
300 TM.getRelocationModel() != Reloc::Static) {
301 printSuffixedName(Name, "$stub");
302 FnStubs.insert(Name);
306 printOffset(MO.getOffset());
308 if (isCallOp && Subtarget->isTargetELF() &&
309 TM.getRelocationModel() == Reloc::PIC_)
311 if (GV->hasExternalWeakLinkage())
312 ExtWeakSymbols.insert(GV);
315 case MachineOperand::MO_ExternalSymbol: {
316 bool isCallOp = Modifier && !strcmp(Modifier, "call");
317 std::string Name(TAI->getGlobalPrefix());
318 Name += MO.getSymbolName();
319 if (isCallOp && Subtarget->isTargetDarwin() &&
320 TM.getRelocationModel() != Reloc::Static) {
321 printSuffixedName(Name, "$stub");
322 FnStubs.insert(Name);
325 if (isCallOp && Subtarget->isTargetELF() &&
326 TM.getRelocationModel() == Reloc::PIC_)
330 case MachineOperand::MO_ConstantPoolIndex:
331 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
332 << '_' << MO.getIndex();
334 case MachineOperand::MO_JumpTableIndex:
335 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
336 << '_' << MO.getIndex();
339 O << "<unknown operand type>"; abort (); break;
343 static void printSOImm(raw_ostream &O, int64_t V, const TargetAsmInfo *TAI) {
344 assert(V < (1 << 12) && "Not a valid so_imm value!");
345 unsigned Imm = ARM_AM::getSOImmValImm(V);
346 unsigned Rot = ARM_AM::getSOImmValRot(V);
348 // Print low-level immediate formation info, per
349 // A5.1.3: "Data-processing operands - Immediate".
351 O << "#" << Imm << ", " << Rot;
352 // Pretty printed version.
353 O << ' ' << TAI->getCommentString() << ' ' << (int)ARM_AM::rotr32(Imm, Rot);
359 /// printSOImmOperand - SOImm is 4-bit rotate amount in bits 8-11 with 8-bit
360 /// immediate in bits 0-7.
361 void ARMAsmPrinter::printSOImmOperand(const MachineInstr *MI, int OpNum) {
362 const MachineOperand &MO = MI->getOperand(OpNum);
363 assert(MO.isImm() && "Not a valid so_imm value!");
364 printSOImm(O, MO.getImm(), TAI);
367 /// printSOImm2PartOperand - SOImm is broken into two pieces using a 'mov'
368 /// followed by an 'orr' to materialize.
369 void ARMAsmPrinter::printSOImm2PartOperand(const MachineInstr *MI, int OpNum) {
370 const MachineOperand &MO = MI->getOperand(OpNum);
371 assert(MO.isImm() && "Not a valid so_imm value!");
372 unsigned V1 = ARM_AM::getSOImmTwoPartFirst(MO.getImm());
373 unsigned V2 = ARM_AM::getSOImmTwoPartSecond(MO.getImm());
374 printSOImm(O, ARM_AM::getSOImmVal(V1), TAI);
376 printPredicateOperand(MI, 2);
382 printSOImm(O, ARM_AM::getSOImmVal(V2), TAI);
385 // so_reg is a 4-operand unit corresponding to register forms of the A5.1
386 // "Addressing Mode 1 - Data-processing operands" forms. This includes:
388 // REG REG 0,SH_OPC - e.g. R5, ROR R3
389 // REG 0 IMM,SH_OPC - e.g. R5, LSL #3
390 void ARMAsmPrinter::printSORegOperand(const MachineInstr *MI, int Op) {
391 const MachineOperand &MO1 = MI->getOperand(Op);
392 const MachineOperand &MO2 = MI->getOperand(Op+1);
393 const MachineOperand &MO3 = MI->getOperand(Op+2);
395 assert(TargetRegisterInfo::isPhysicalRegister(MO1.getReg()));
396 O << TM.getRegisterInfo()->get(MO1.getReg()).AsmName;
398 // Print the shift opc.
400 << ARM_AM::getShiftOpcStr(ARM_AM::getSORegShOp(MO3.getImm()))
404 assert(TargetRegisterInfo::isPhysicalRegister(MO2.getReg()));
405 O << TM.getRegisterInfo()->get(MO2.getReg()).AsmName;
406 assert(ARM_AM::getSORegOffset(MO3.getImm()) == 0);
408 O << "#" << ARM_AM::getSORegOffset(MO3.getImm());
412 void ARMAsmPrinter::printAddrMode2Operand(const MachineInstr *MI, int Op) {
413 const MachineOperand &MO1 = MI->getOperand(Op);
414 const MachineOperand &MO2 = MI->getOperand(Op+1);
415 const MachineOperand &MO3 = MI->getOperand(Op+2);
417 if (!MO1.isReg()) { // FIXME: This is for CP entries, but isn't right.
418 printOperand(MI, Op);
422 O << "[" << TM.getRegisterInfo()->get(MO1.getReg()).AsmName;
425 if (ARM_AM::getAM2Offset(MO3.getImm())) // Don't print +0.
427 << (char)ARM_AM::getAM2Op(MO3.getImm())
428 << ARM_AM::getAM2Offset(MO3.getImm());
434 << (char)ARM_AM::getAM2Op(MO3.getImm())
435 << TM.getRegisterInfo()->get(MO2.getReg()).AsmName;
437 if (unsigned ShImm = ARM_AM::getAM2Offset(MO3.getImm()))
439 << ARM_AM::getShiftOpcStr(ARM_AM::getAM2ShiftOpc(MO3.getImm()))
444 void ARMAsmPrinter::printAddrMode2OffsetOperand(const MachineInstr *MI, int Op){
445 const MachineOperand &MO1 = MI->getOperand(Op);
446 const MachineOperand &MO2 = MI->getOperand(Op+1);
449 unsigned ImmOffs = ARM_AM::getAM2Offset(MO2.getImm());
450 assert(ImmOffs && "Malformed indexed load / store!");
452 << (char)ARM_AM::getAM2Op(MO2.getImm())
457 O << (char)ARM_AM::getAM2Op(MO2.getImm())
458 << TM.getRegisterInfo()->get(MO1.getReg()).AsmName;
460 if (unsigned ShImm = ARM_AM::getAM2Offset(MO2.getImm()))
462 << ARM_AM::getShiftOpcStr(ARM_AM::getAM2ShiftOpc(MO2.getImm()))
466 void ARMAsmPrinter::printAddrMode3Operand(const MachineInstr *MI, int Op) {
467 const MachineOperand &MO1 = MI->getOperand(Op);
468 const MachineOperand &MO2 = MI->getOperand(Op+1);
469 const MachineOperand &MO3 = MI->getOperand(Op+2);
471 assert(TargetRegisterInfo::isPhysicalRegister(MO1.getReg()));
472 O << "[" << TM.getRegisterInfo()->get(MO1.getReg()).AsmName;
476 << (char)ARM_AM::getAM3Op(MO3.getImm())
477 << TM.getRegisterInfo()->get(MO2.getReg()).AsmName
482 if (unsigned ImmOffs = ARM_AM::getAM3Offset(MO3.getImm()))
484 << (char)ARM_AM::getAM3Op(MO3.getImm())
489 void ARMAsmPrinter::printAddrMode3OffsetOperand(const MachineInstr *MI, int Op){
490 const MachineOperand &MO1 = MI->getOperand(Op);
491 const MachineOperand &MO2 = MI->getOperand(Op+1);
494 O << (char)ARM_AM::getAM3Op(MO2.getImm())
495 << TM.getRegisterInfo()->get(MO1.getReg()).AsmName;
499 unsigned ImmOffs = ARM_AM::getAM3Offset(MO2.getImm());
500 assert(ImmOffs && "Malformed indexed load / store!");
502 << (char)ARM_AM::getAM3Op(MO2.getImm())
506 void ARMAsmPrinter::printAddrMode4Operand(const MachineInstr *MI, int Op,
507 const char *Modifier) {
508 const MachineOperand &MO1 = MI->getOperand(Op);
509 const MachineOperand &MO2 = MI->getOperand(Op+1);
510 ARM_AM::AMSubMode Mode = ARM_AM::getAM4SubMode(MO2.getImm());
511 if (Modifier && strcmp(Modifier, "submode") == 0) {
512 if (MO1.getReg() == ARM::SP) {
513 bool isLDM = (MI->getOpcode() == ARM::LDM ||
514 MI->getOpcode() == ARM::LDM_RET);
515 O << ARM_AM::getAMSubModeAltStr(Mode, isLDM);
517 O << ARM_AM::getAMSubModeStr(Mode);
519 printOperand(MI, Op);
520 if (ARM_AM::getAM4WBFlag(MO2.getImm()))
525 void ARMAsmPrinter::printAddrMode5Operand(const MachineInstr *MI, int Op,
526 const char *Modifier) {
527 const MachineOperand &MO1 = MI->getOperand(Op);
528 const MachineOperand &MO2 = MI->getOperand(Op+1);
530 if (!MO1.isReg()) { // FIXME: This is for CP entries, but isn't right.
531 printOperand(MI, Op);
535 assert(TargetRegisterInfo::isPhysicalRegister(MO1.getReg()));
537 if (Modifier && strcmp(Modifier, "submode") == 0) {
538 ARM_AM::AMSubMode Mode = ARM_AM::getAM5SubMode(MO2.getImm());
539 if (MO1.getReg() == ARM::SP) {
540 bool isFLDM = (MI->getOpcode() == ARM::FLDMD ||
541 MI->getOpcode() == ARM::FLDMS);
542 O << ARM_AM::getAMSubModeAltStr(Mode, isFLDM);
544 O << ARM_AM::getAMSubModeStr(Mode);
546 } else if (Modifier && strcmp(Modifier, "base") == 0) {
547 // Used for FSTM{D|S} and LSTM{D|S} operations.
548 O << TM.getRegisterInfo()->get(MO1.getReg()).AsmName;
549 if (ARM_AM::getAM5WBFlag(MO2.getImm()))
554 O << "[" << TM.getRegisterInfo()->get(MO1.getReg()).AsmName;
556 if (unsigned ImmOffs = ARM_AM::getAM5Offset(MO2.getImm())) {
558 << (char)ARM_AM::getAM5Op(MO2.getImm())
564 void ARMAsmPrinter::printAddrModePCOperand(const MachineInstr *MI, int Op,
565 const char *Modifier) {
566 if (Modifier && strcmp(Modifier, "label") == 0) {
567 printPCLabel(MI, Op+1);
571 const MachineOperand &MO1 = MI->getOperand(Op);
572 assert(TargetRegisterInfo::isPhysicalRegister(MO1.getReg()));
573 O << "[pc, +" << TM.getRegisterInfo()->get(MO1.getReg()).AsmName << "]";
577 ARMAsmPrinter::printThumbAddrModeRROperand(const MachineInstr *MI, int Op) {
578 const MachineOperand &MO1 = MI->getOperand(Op);
579 const MachineOperand &MO2 = MI->getOperand(Op+1);
580 O << "[" << TM.getRegisterInfo()->get(MO1.getReg()).AsmName;
581 O << ", " << TM.getRegisterInfo()->get(MO2.getReg()).AsmName << "]";
585 ARMAsmPrinter::printThumbAddrModeRI5Operand(const MachineInstr *MI, int Op,
587 const MachineOperand &MO1 = MI->getOperand(Op);
588 const MachineOperand &MO2 = MI->getOperand(Op+1);
589 const MachineOperand &MO3 = MI->getOperand(Op+2);
591 if (!MO1.isReg()) { // FIXME: This is for CP entries, but isn't right.
592 printOperand(MI, Op);
596 O << "[" << TM.getRegisterInfo()->get(MO1.getReg()).AsmName;
598 O << ", " << TM.getRegisterInfo()->get(MO3.getReg()).AsmName;
599 else if (unsigned ImmOffs = MO2.getImm()) {
600 O << ", #" << ImmOffs;
608 ARMAsmPrinter::printThumbAddrModeS1Operand(const MachineInstr *MI, int Op) {
609 printThumbAddrModeRI5Operand(MI, Op, 1);
612 ARMAsmPrinter::printThumbAddrModeS2Operand(const MachineInstr *MI, int Op) {
613 printThumbAddrModeRI5Operand(MI, Op, 2);
616 ARMAsmPrinter::printThumbAddrModeS4Operand(const MachineInstr *MI, int Op) {
617 printThumbAddrModeRI5Operand(MI, Op, 4);
620 void ARMAsmPrinter::printThumbAddrModeSPOperand(const MachineInstr *MI,int Op) {
621 const MachineOperand &MO1 = MI->getOperand(Op);
622 const MachineOperand &MO2 = MI->getOperand(Op+1);
623 O << "[" << TM.getRegisterInfo()->get(MO1.getReg()).AsmName;
624 if (unsigned ImmOffs = MO2.getImm())
625 O << ", #" << ImmOffs << " * 4";
629 void ARMAsmPrinter::printPredicateOperand(const MachineInstr *MI, int opNum) {
630 ARMCC::CondCodes CC = (ARMCC::CondCodes)MI->getOperand(opNum).getImm();
632 O << ARMCondCodeToString(CC);
635 void ARMAsmPrinter::printSBitModifierOperand(const MachineInstr *MI, int opNum){
636 unsigned Reg = MI->getOperand(opNum).getReg();
638 assert(Reg == ARM::CPSR && "Expect ARM CPSR register!");
643 void ARMAsmPrinter::printPCLabel(const MachineInstr *MI, int opNum) {
644 int Id = (int)MI->getOperand(opNum).getImm();
645 O << TAI->getPrivateGlobalPrefix() << "PC" << Id;
648 void ARMAsmPrinter::printRegisterList(const MachineInstr *MI, int opNum) {
650 for (unsigned i = opNum, e = MI->getNumOperands(); i != e; ++i) {
652 if (i != e-1) O << ", ";
657 void ARMAsmPrinter::printCPInstOperand(const MachineInstr *MI, int OpNo,
658 const char *Modifier) {
659 assert(Modifier && "This operand only works with a modifier!");
660 // There are two aspects to a CONSTANTPOOL_ENTRY operand, the label and the
662 if (!strcmp(Modifier, "label")) {
663 unsigned ID = MI->getOperand(OpNo).getImm();
664 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
665 << '_' << ID << ":\n";
667 assert(!strcmp(Modifier, "cpentry") && "Unknown modifier for CPE");
668 unsigned CPI = MI->getOperand(OpNo).getIndex();
670 const MachineConstantPoolEntry &MCPE = MCP->getConstants()[CPI];
672 if (MCPE.isMachineConstantPoolEntry()) {
673 EmitMachineConstantPoolValue(MCPE.Val.MachineCPVal);
675 EmitGlobalConstant(MCPE.Val.ConstVal);
676 // remember to emit the weak reference
677 if (const GlobalValue *GV = dyn_cast<GlobalValue>(MCPE.Val.ConstVal))
678 if (GV->hasExternalWeakLinkage())
679 ExtWeakSymbols.insert(GV);
684 void ARMAsmPrinter::printJTBlockOperand(const MachineInstr *MI, int OpNo) {
685 const MachineOperand &MO1 = MI->getOperand(OpNo);
686 const MachineOperand &MO2 = MI->getOperand(OpNo+1); // Unique Id
687 unsigned JTI = MO1.getIndex();
688 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
689 << '_' << JTI << '_' << MO2.getImm() << ":\n";
691 const char *JTEntryDirective = TAI->getJumpTableDirective();
692 if (!JTEntryDirective)
693 JTEntryDirective = TAI->getData32bitsDirective();
695 const MachineFunction *MF = MI->getParent()->getParent();
696 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
697 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
698 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
699 bool UseSet= TAI->getSetDirective() && TM.getRelocationModel() == Reloc::PIC_;
700 std::set<MachineBasicBlock*> JTSets;
701 for (unsigned i = 0, e = JTBBs.size(); i != e; ++i) {
702 MachineBasicBlock *MBB = JTBBs[i];
703 if (UseSet && JTSets.insert(MBB).second)
704 printPICJumpTableSetLabel(JTI, MO2.getImm(), MBB);
706 O << JTEntryDirective << ' ';
708 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
709 << '_' << JTI << '_' << MO2.getImm()
710 << "_set_" << MBB->getNumber();
711 else if (TM.getRelocationModel() == Reloc::PIC_) {
712 printBasicBlockLabel(MBB, false, false, false);
713 // If the arch uses custom Jump Table directives, don't calc relative to JT
714 if (!TAI->getJumpTableDirective())
715 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI"
716 << getFunctionNumber() << '_' << JTI << '_' << MO2.getImm();
718 printBasicBlockLabel(MBB, false, false, false);
725 bool ARMAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
726 unsigned AsmVariant, const char *ExtraCode){
727 // Does this asm operand have a single letter operand modifier?
728 if (ExtraCode && ExtraCode[0]) {
729 if (ExtraCode[1] != 0) return true; // Unknown modifier.
731 switch (ExtraCode[0]) {
732 default: return true; // Unknown modifier.
733 case 'c': // Don't print "$" before a global var name or constant.
734 case 'P': // Print a VFP double precision register.
735 printOperand(MI, OpNo);
738 if (TM.getTargetData()->isLittleEndian())
742 if (TM.getTargetData()->isBigEndian())
745 case 'H': // Write second word of DI / DF reference.
746 // Verify that this operand has two consecutive registers.
747 if (!MI->getOperand(OpNo).isReg() ||
748 OpNo+1 == MI->getNumOperands() ||
749 !MI->getOperand(OpNo+1).isReg())
751 ++OpNo; // Return the high-part.
755 printOperand(MI, OpNo);
759 void ARMAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
762 int Opc = MI->getOpcode();
764 case ARM::CONSTPOOL_ENTRY:
765 if (!InCPMode && AFI->isThumbFunction()) {
771 if (InCPMode && AFI->isThumbFunction())
775 // Call the autogenerated instruction printer routines.
776 printInstruction(MI);
779 bool ARMAsmPrinter::doInitialization(Module &M) {
781 bool Result = AsmPrinter::doInitialization(M);
783 // Emit initial debug information.
784 MMI = getAnalysisToUpdate<MachineModuleInfo>();
786 DW = getAnalysisToUpdate<DwarfWriter>();
787 assert(DW && "Dwarf Writer is not available");
788 DW->BeginModule(&M, MMI, O, this, TAI);
790 // Darwin wants symbols to be quoted if they have complex names.
791 if (Subtarget->isTargetDarwin())
792 Mang->setUseQuotes(true);
797 /// PrintUnmangledNameSafely - Print out the printable characters in the name.
798 /// Don't print things like \n or \0.
799 static void PrintUnmangledNameSafely(const Value *V, raw_ostream &OS) {
800 for (const char *Name = V->getNameStart(), *E = Name+V->getNameLen();
806 void ARMAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
807 const TargetData *TD = TM.getTargetData();
809 if (!GVar->hasInitializer()) // External global require no code
812 // Check to see if this is a special global used by LLVM, if so, emit it.
814 if (EmitSpecialLLVMGlobal(GVar)) {
815 if (Subtarget->isTargetDarwin() &&
816 TM.getRelocationModel() == Reloc::Static) {
817 if (GVar->getName() == "llvm.global_ctors")
818 O << ".reference .constructors_used\n";
819 else if (GVar->getName() == "llvm.global_dtors")
820 O << ".reference .destructors_used\n";
825 std::string name = Mang->getValueName(GVar);
826 Constant *C = GVar->getInitializer();
827 const Type *Type = C->getType();
828 unsigned Size = TD->getTypePaddedSize(Type);
829 unsigned Align = TD->getPreferredAlignmentLog(GVar);
830 bool isDarwin = Subtarget->isTargetDarwin();
832 printVisibility(name, GVar->getVisibility());
834 if (Subtarget->isTargetELF())
835 O << "\t.type " << name << ",%object\n";
837 if (C->isNullValue() && !GVar->hasSection() && !GVar->isThreadLocal()) {
838 // FIXME: This seems to be pretty darwin-specific
840 if (GVar->hasExternalLinkage()) {
841 SwitchToSection(TAI->SectionForGlobal(GVar));
842 if (const char *Directive = TAI->getZeroFillDirective()) {
843 O << "\t.globl\t" << name << "\n";
844 O << Directive << "__DATA, __common, " << name << ", "
845 << Size << ", " << Align << "\n";
850 if (GVar->hasInternalLinkage() || GVar->mayBeOverridden()) {
851 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
854 if (GVar->hasInternalLinkage()) {
855 O << TAI->getLCOMMDirective() << name << "," << Size
857 } else if (GVar->hasCommonLinkage()) {
858 O << TAI->getCOMMDirective() << name << "," << Size
861 SwitchToSection(TAI->SectionForGlobal(GVar));
862 O << "\t.globl " << name << '\n'
863 << TAI->getWeakDefDirective() << name << '\n';
864 EmitAlignment(Align, GVar);
865 O << name << ":\t\t\t\t" << TAI->getCommentString() << ' ';
866 PrintUnmangledNameSafely(GVar, O);
868 EmitGlobalConstant(C);
871 } else if (TAI->getLCOMMDirective() != NULL) {
872 if (GVar->hasInternalLinkage()) {
873 O << TAI->getLCOMMDirective() << name << "," << Size;
875 O << TAI->getCOMMDirective() << name << "," << Size;
876 if (TAI->getCOMMDirectiveTakesAlignment())
877 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
880 SwitchToSection(TAI->SectionForGlobal(GVar));
881 if (GVar->hasInternalLinkage())
882 O << "\t.local\t" << name << "\n";
883 O << TAI->getCOMMDirective() << name << "," << Size;
884 if (TAI->getCOMMDirectiveTakesAlignment())
885 O << "," << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
887 O << "\t\t" << TAI->getCommentString() << " ";
888 PrintUnmangledNameSafely(GVar, O);
894 SwitchToSection(TAI->SectionForGlobal(GVar));
895 switch (GVar->getLinkage()) {
896 case GlobalValue::CommonLinkage:
897 case GlobalValue::LinkOnceLinkage:
898 case GlobalValue::WeakLinkage:
900 O << "\t.globl " << name << "\n"
901 << "\t.weak_definition " << name << "\n";
903 O << "\t.weak " << name << "\n";
906 case GlobalValue::AppendingLinkage:
907 // FIXME: appending linkage variables should go into a section of
908 // their name or something. For now, just emit them as external.
909 case GlobalValue::ExternalLinkage:
910 O << "\t.globl " << name << "\n";
912 case GlobalValue::InternalLinkage:
915 assert(0 && "Unknown linkage type!");
919 EmitAlignment(Align, GVar);
920 O << name << ":\t\t\t\t" << TAI->getCommentString() << " ";
921 PrintUnmangledNameSafely(GVar, O);
923 if (TAI->hasDotTypeDotSizeDirective())
924 O << "\t.size " << name << ", " << Size << "\n";
926 // If the initializer is a extern weak symbol, remember to emit the weak
928 if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
929 if (GV->hasExternalWeakLinkage())
930 ExtWeakSymbols.insert(GV);
932 EmitGlobalConstant(C);
937 bool ARMAsmPrinter::doFinalization(Module &M) {
938 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
940 printModuleLevelGV(I);
942 if (Subtarget->isTargetDarwin()) {
943 SwitchToDataSection("");
945 // Output stubs for dynamically-linked functions
946 for (StringSet<>::iterator i = FnStubs.begin(), e = FnStubs.end();
948 if (TM.getRelocationModel() == Reloc::PIC_)
949 SwitchToTextSection(".section __TEXT,__picsymbolstub4,symbol_stubs,"
952 SwitchToTextSection(".section __TEXT,__symbol_stub4,symbol_stubs,"
956 O << "\t.code\t32\n";
958 const char *p = i->getKeyData();
959 printSuffixedName(p, "$stub");
961 O << "\t.indirect_symbol " << p << "\n";
963 printSuffixedName(p, "$slp");
965 if (TM.getRelocationModel() == Reloc::PIC_) {
966 printSuffixedName(p, "$scv");
968 O << "\tadd ip, pc, ip\n";
970 O << "\tldr pc, [ip, #0]\n";
971 printSuffixedName(p, "$slp");
974 printSuffixedName(p, "$lazy_ptr");
975 if (TM.getRelocationModel() == Reloc::PIC_) {
977 printSuffixedName(p, "$scv");
981 SwitchToDataSection(".lazy_symbol_pointer", 0);
982 printSuffixedName(p, "$lazy_ptr");
984 O << "\t.indirect_symbol " << p << "\n";
985 O << "\t.long\tdyld_stub_binding_helper\n";
989 // Output non-lazy-pointers for external and common global variables.
990 if (!GVNonLazyPtrs.empty()) {
991 SwitchToDataSection("\t.non_lazy_symbol_pointer", 0);
992 for (StringSet<>::iterator i = GVNonLazyPtrs.begin(),
993 e = GVNonLazyPtrs.end(); i != e; ++i) {
994 const char *p = i->getKeyData();
995 printSuffixedName(p, "$non_lazy_ptr");
997 O << "\t.indirect_symbol " << p << "\n";
1002 if (!HiddenGVNonLazyPtrs.empty()) {
1003 SwitchToSection(TAI->getDataSection());
1004 for (StringSet<>::iterator i = HiddenGVNonLazyPtrs.begin(),
1005 e = HiddenGVNonLazyPtrs.end(); i != e; ++i) {
1006 const char *p = i->getKeyData();
1008 printSuffixedName(p, "$non_lazy_ptr");
1010 O << "\t.long " << p << "\n";
1015 // Emit initial debug information.
1018 // Funny Darwin hack: This flag tells the linker that no global symbols
1019 // contain code that falls through to other global symbols (e.g. the obvious
1020 // implementation of multiple entry points). If this doesn't occur, the
1021 // linker can safely perform dead code stripping. Since LLVM never
1022 // generates code that does this, it is always safe to set.
1023 O << "\t.subsections_via_symbols\n";
1025 // Emit final debug information for ELF.
1029 return AsmPrinter::doFinalization(M);
1032 /// createARMCodePrinterPass - Returns a pass that prints the ARM
1033 /// assembly code for a MachineFunction to the given output stream,
1034 /// using the given target machine description. This should work
1035 /// regardless of whether the function is in SSA form.
1037 FunctionPass *llvm::createARMCodePrinterPass(raw_ostream &o,
1038 ARMTargetMachine &tm) {
1039 return new ARMAsmPrinter(o, tm, tm.getTargetAsmInfo());
1043 static struct Register {
1045 ARMTargetMachine::registerAsmPrinter(createARMCodePrinterPass);