1 //===-- SystemZAsmPrinter.cpp - SystemZ 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 the SystemZ assembly language.
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "asm-printer"
17 #include "SystemZInstrInfo.h"
18 #include "SystemZTargetMachine.h"
19 #include "llvm/Constants.h"
20 #include "llvm/DerivedTypes.h"
21 #include "llvm/Module.h"
22 #include "llvm/Assembly/Writer.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/MachineConstantPool.h"
28 #include "llvm/CodeGen/MachineInstr.h"
29 #include "llvm/MC/MCStreamer.h"
30 #include "llvm/MC/MCAsmInfo.h"
31 #include "llvm/MC/MCSymbol.h"
32 #include "llvm/Target/TargetData.h"
33 #include "llvm/Target/TargetLoweringObjectFile.h"
34 #include "llvm/Target/TargetRegistry.h"
35 #include "llvm/ADT/Statistic.h"
36 #include "llvm/Support/Compiler.h"
37 #include "llvm/Support/FormattedStream.h"
38 #include "llvm/Support/Mangler.h"
42 STATISTIC(EmittedInsts, "Number of machine instrs printed");
45 class VISIBILITY_HIDDEN SystemZAsmPrinter : public AsmPrinter {
47 SystemZAsmPrinter(formatted_raw_ostream &O, TargetMachine &TM,
48 const MCAsmInfo *MAI, bool V)
49 : AsmPrinter(O, TM, MAI, V) {}
51 virtual const char *getPassName() const {
52 return "SystemZ Assembly Printer";
55 void printOperand(const MachineInstr *MI, int OpNum,
56 const char* Modifier = 0);
57 void printPCRelImmOperand(const MachineInstr *MI, int OpNum);
58 void printRIAddrOperand(const MachineInstr *MI, int OpNum,
59 const char* Modifier = 0);
60 void printRRIAddrOperand(const MachineInstr *MI, int OpNum,
61 const char* Modifier = 0);
62 void printS16ImmOperand(const MachineInstr *MI, int OpNum) {
63 O << (int16_t)MI->getOperand(OpNum).getImm();
65 void printS32ImmOperand(const MachineInstr *MI, int OpNum) {
66 O << (int32_t)MI->getOperand(OpNum).getImm();
69 void printInstruction(const MachineInstr *MI); // autogenerated.
70 const char *getRegisterName(unsigned RegNo) const;
72 void printMachineInstruction(const MachineInstr * MI);
74 void emitFunctionHeader(const MachineFunction &MF);
75 bool runOnMachineFunction(MachineFunction &F);
76 void PrintGlobalVariable(const GlobalVariable* GVar);
78 void getAnalysisUsage(AnalysisUsage &AU) const {
79 AsmPrinter::getAnalysisUsage(AU);
83 } // end of anonymous namespace
85 #include "SystemZGenAsmWriter.inc"
87 void SystemZAsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
88 unsigned FnAlign = MF.getAlignment();
89 const Function *F = MF.getFunction();
91 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
93 EmitAlignment(FnAlign, F);
95 switch (F->getLinkage()) {
96 default: assert(0 && "Unknown linkage type!");
97 case Function::InternalLinkage: // Symbols default to internal.
98 case Function::PrivateLinkage:
99 case Function::LinkerPrivateLinkage:
101 case Function::ExternalLinkage:
102 O << "\t.globl\t" << CurrentFnName << '\n';
104 case Function::LinkOnceAnyLinkage:
105 case Function::LinkOnceODRLinkage:
106 case Function::WeakAnyLinkage:
107 case Function::WeakODRLinkage:
108 O << "\t.weak\t" << CurrentFnName << '\n';
112 printVisibility(CurrentFnName, F->getVisibility());
114 O << "\t.type\t" << CurrentFnName << ",@function\n"
115 << CurrentFnName << ":\n";
118 bool SystemZAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
119 SetupMachineFunction(MF);
122 // Print out constants referenced by the function
123 EmitConstantPool(MF.getConstantPool());
125 // Print the 'header' of function
126 emitFunctionHeader(MF);
128 // Print out code for the function.
129 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
131 // Print a label for the basic block.
132 if (!VerboseAsm && (I->pred_empty() || I->isOnlyReachableByFallthrough())) {
133 // This is an entry block or a block that's only reachable via a
134 // fallthrough edge. In non-VerboseAsm mode, don't print the label.
136 EmitBasicBlockStart(I);
140 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
142 // Print the assembly for the instruction.
143 printMachineInstruction(II);
146 if (MAI->hasDotTypeDotSizeDirective())
147 O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n';
149 // Print out jump tables referenced by the function.
150 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
152 // We didn't modify anything
156 void SystemZAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
159 processDebugLoc(MI->getDebugLoc());
161 // Call the autogenerated instruction printer routines.
162 printInstruction(MI);
164 if (VerboseAsm && !MI->getDebugLoc().isUnknown())
169 void SystemZAsmPrinter::printPCRelImmOperand(const MachineInstr *MI, int OpNum){
170 const MachineOperand &MO = MI->getOperand(OpNum);
171 switch (MO.getType()) {
172 case MachineOperand::MO_Immediate:
175 case MachineOperand::MO_MachineBasicBlock:
176 GetMBBSymbol(MO.getMBB()->getNumber())->print(O, MAI);
178 case MachineOperand::MO_GlobalAddress: {
179 const GlobalValue *GV = MO.getGlobal();
180 std::string Name = Mang->getMangledName(GV);
184 // Assemble calls via PLT for externally visible symbols if PIC.
185 if (TM.getRelocationModel() == Reloc::PIC_ &&
186 !GV->hasHiddenVisibility() && !GV->hasProtectedVisibility() &&
187 !GV->hasLocalLinkage())
190 printOffset(MO.getOffset());
193 case MachineOperand::MO_ExternalSymbol: {
194 std::string Name(MAI->getGlobalPrefix());
195 Name += MO.getSymbolName();
198 if (TM.getRelocationModel() == Reloc::PIC_)
204 assert(0 && "Not implemented yet!");
209 void SystemZAsmPrinter::printOperand(const MachineInstr *MI, int OpNum,
210 const char* Modifier) {
211 const MachineOperand &MO = MI->getOperand(OpNum);
212 switch (MO.getType()) {
213 case MachineOperand::MO_Register: {
214 assert (TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
215 "Virtual registers should be already mapped!");
216 unsigned Reg = MO.getReg();
217 if (Modifier && strncmp(Modifier, "subreg", 6) == 0) {
218 if (strncmp(Modifier + 7, "even", 4) == 0)
219 Reg = TRI->getSubReg(Reg, SystemZ::SUBREG_EVEN);
220 else if (strncmp(Modifier + 7, "odd", 3) == 0)
221 Reg = TRI->getSubReg(Reg, SystemZ::SUBREG_ODD);
223 assert(0 && "Invalid subreg modifier");
226 O << '%' << TRI->getAsmName(Reg);
229 case MachineOperand::MO_Immediate:
232 case MachineOperand::MO_MachineBasicBlock:
233 GetMBBSymbol(MO.getMBB()->getNumber())->print(O, MAI);
235 case MachineOperand::MO_JumpTableIndex:
236 O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_'
240 case MachineOperand::MO_ConstantPoolIndex:
241 O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
244 printOffset(MO.getOffset());
246 case MachineOperand::MO_GlobalAddress: {
247 const GlobalValue *GV = MO.getGlobal();
248 std::string Name = Mang->getMangledName(GV);
253 case MachineOperand::MO_ExternalSymbol: {
254 std::string Name(MAI->getGlobalPrefix());
255 Name += MO.getSymbolName();
260 assert(0 && "Not implemented yet!");
263 switch (MO.getTargetFlags()) {
265 llvm_unreachable("Unknown target flag on GV operand");
266 case SystemZII::MO_NO_FLAG:
268 case SystemZII::MO_GOTENT: O << "@GOTENT"; break;
269 case SystemZII::MO_PLT: O << "@PLT"; break;
272 printOffset(MO.getOffset());
275 void SystemZAsmPrinter::printRIAddrOperand(const MachineInstr *MI, int OpNum,
276 const char* Modifier) {
277 const MachineOperand &Base = MI->getOperand(OpNum);
279 // Print displacement operand.
280 printOperand(MI, OpNum+1);
282 // Print base operand (if any)
285 printOperand(MI, OpNum);
290 void SystemZAsmPrinter::printRRIAddrOperand(const MachineInstr *MI, int OpNum,
291 const char* Modifier) {
292 const MachineOperand &Base = MI->getOperand(OpNum);
293 const MachineOperand &Index = MI->getOperand(OpNum+2);
295 // Print displacement operand.
296 printOperand(MI, OpNum+1);
298 // Print base operand (if any)
301 printOperand(MI, OpNum);
302 if (Index.getReg()) {
304 printOperand(MI, OpNum+2);
308 assert(!Index.getReg() && "Should allocate base register first!");
311 void SystemZAsmPrinter::PrintGlobalVariable(const GlobalVariable* GVar) {
312 const TargetData *TD = TM.getTargetData();
314 if (!GVar->hasInitializer())
315 return; // External global require no code
317 // Check to see if this is a special global used by LLVM, if so, emit it.
318 if (EmitSpecialLLVMGlobal(GVar))
321 std::string name = Mang->getMangledName(GVar);
322 Constant *C = GVar->getInitializer();
323 unsigned Size = TD->getTypeAllocSize(C->getType());
324 unsigned Align = std::max(1U, TD->getPreferredAlignmentLog(GVar));
326 printVisibility(name, GVar->getVisibility());
328 O << "\t.type\t" << name << ",@object\n";
330 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(GVar, Mang,
333 if (C->isNullValue() && !GVar->hasSection() &&
334 !GVar->isThreadLocal() &&
335 (GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
337 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
339 if (GVar->hasLocalLinkage())
340 O << "\t.local\t" << name << '\n';
342 O << MAI->getCOMMDirective() << name << ',' << Size;
343 if (MAI->getCOMMDirectiveTakesAlignment())
344 O << ',' << (MAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
347 O << "\t\t" << MAI->getCommentString() << ' ';
348 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
354 switch (GVar->getLinkage()) {
355 case GlobalValue::CommonLinkage:
356 case GlobalValue::LinkOnceAnyLinkage:
357 case GlobalValue::LinkOnceODRLinkage:
358 case GlobalValue::WeakAnyLinkage:
359 case GlobalValue::WeakODRLinkage:
360 O << "\t.weak\t" << name << '\n';
362 case GlobalValue::DLLExportLinkage:
363 case GlobalValue::AppendingLinkage:
364 // FIXME: appending linkage variables should go into a section of
365 // their name or something. For now, just emit them as external.
366 case GlobalValue::ExternalLinkage:
367 // If external or appending, declare as a global symbol
368 O << "\t.globl " << name << '\n';
370 case GlobalValue::PrivateLinkage:
371 case GlobalValue::LinkerPrivateLinkage:
372 case GlobalValue::InternalLinkage:
375 assert(0 && "Unknown linkage type!");
378 // Use 16-bit alignment by default to simplify bunch of stuff
379 EmitAlignment(Align, GVar, 1);
382 O << "\t\t\t\t" << MAI->getCommentString() << ' ';
383 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
386 if (MAI->hasDotTypeDotSizeDirective())
387 O << "\t.size\t" << name << ", " << Size << '\n';
389 EmitGlobalConstant(C);
392 // Force static initialization.
393 extern "C" void LLVMInitializeSystemZAsmPrinter() {
394 RegisterAsmPrinter<SystemZAsmPrinter> X(TheSystemZTarget);