1 //===-- IA64AsmPrinter.cpp - Print out IA64 LLVM as assembly --------------===//
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 assembly accepted by the GNU binutils 'gas'
12 // assembler. The Intel 'ias' and HP-UX 'as' assemblers *may* choke on this
13 // output, but if so that's a bug I'd like to hear about: please file a bug
14 // report in bugzilla. FYI, the not too bad 'ias' assembler is bundled with
15 // the Intel C/C++ compiler for Itanium Linux.
17 //===----------------------------------------------------------------------===//
19 #define DEBUG_TYPE "asm-printer"
21 #include "IA64TargetMachine.h"
22 #include "llvm/Module.h"
23 #include "llvm/Type.h"
24 #include "llvm/CodeGen/AsmPrinter.h"
25 #include "llvm/CodeGen/MachineFunctionPass.h"
26 #include "llvm/Target/TargetAsmInfo.h"
27 #include "llvm/Target/TargetMachine.h"
28 #include "llvm/Support/Mangler.h"
29 #include "llvm/Support/raw_ostream.h"
30 #include "llvm/ADT/Statistic.h"
33 STATISTIC(EmittedInsts, "Number of machine instrs printed");
36 struct IA64AsmPrinter : public AsmPrinter {
37 std::set<std::string> ExternalFunctionNames, ExternalObjectNames;
39 IA64AsmPrinter(raw_ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
40 : AsmPrinter(O, TM, T) {
43 virtual const char *getPassName() const {
44 return "IA64 Assembly Printer";
47 /// printInstruction - This method is automatically generated by tablegen
48 /// from the instruction set description. This method returns true if the
49 /// machine instruction was sufficiently described to print it, otherwise it
51 bool printInstruction(const MachineInstr *MI);
53 // This method is used by the tablegen'erated instruction printer.
54 void printOperand(const MachineInstr *MI, unsigned OpNo){
55 const MachineOperand &MO = MI->getOperand(OpNo);
56 if (MO.getType() == MachineOperand::MO_Register) {
57 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
59 //XXX Bug Workaround: See note in Printer::doInitialization about %.
60 O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
66 void printS8ImmOperand(const MachineInstr *MI, unsigned OpNo) {
67 int val=(unsigned int)MI->getOperand(OpNo).getImm();
68 if(val>=128) val=val-256; // if negative, flip sign
71 void printS14ImmOperand(const MachineInstr *MI, unsigned OpNo) {
72 int val=(unsigned int)MI->getOperand(OpNo).getImm();
73 if(val>=8192) val=val-16384; // if negative, flip sign
76 void printS22ImmOperand(const MachineInstr *MI, unsigned OpNo) {
77 int val=(unsigned int)MI->getOperand(OpNo).getImm();
78 if(val>=2097152) val=val-4194304; // if negative, flip sign
81 void printU64ImmOperand(const MachineInstr *MI, unsigned OpNo) {
82 O << (uint64_t)MI->getOperand(OpNo).getImm();
84 void printS64ImmOperand(const MachineInstr *MI, unsigned OpNo) {
85 // XXX : nasty hack to avoid GPREL22 "relocation truncated to fit" linker
86 // errors - instead of add rX = @gprel(CPI<whatever>), r1;; we now
87 // emit movl rX = @gprel(CPI<whatever);;
89 // this gives us 64 bits instead of 22 (for the add long imm) to play
90 // with, which shuts up the linker. The problem is that the constant
91 // pool entries aren't immediates at this stage, so we check here.
92 // If it's an immediate, print it the old fashioned way. If it's
93 // not, we print it as a constant pool index.
94 if(MI->getOperand(OpNo).isImmediate()) {
95 O << (int64_t)MI->getOperand(OpNo).getImm();
96 } else { // this is a constant pool reference: FIXME: assert this
97 printOp(MI->getOperand(OpNo));
101 void printGlobalOperand(const MachineInstr *MI, unsigned OpNo) {
102 printOp(MI->getOperand(OpNo), false); // this is NOT a br.call instruction
105 void printCallOperand(const MachineInstr *MI, unsigned OpNo) {
106 printOp(MI->getOperand(OpNo), true); // this is a br.call instruction
109 void printMachineInstruction(const MachineInstr *MI);
110 void printOp(const MachineOperand &MO, bool isBRCALLinsn= false);
111 void printModuleLevelGV(const GlobalVariable* GVar);
112 bool runOnMachineFunction(MachineFunction &F);
113 bool doInitialization(Module &M);
114 bool doFinalization(Module &M);
116 } // end of anonymous namespace
119 // Include the auto-generated portion of the assembly writer.
120 #include "IA64GenAsmWriter.inc"
122 /// runOnMachineFunction - This uses the printMachineInstruction()
123 /// method to print assembly for each instruction.
125 bool IA64AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
126 SetupMachineFunction(MF);
129 // Print out constants referenced by the function
130 EmitConstantPool(MF.getConstantPool());
132 const Function *F = MF.getFunction();
133 SwitchToSection(TAI->SectionForGlobal(F));
135 // Print out labels for the function.
137 O << "\t.global\t" << CurrentFnName << '\n';
139 printVisibility(CurrentFnName, F->getVisibility());
141 O << "\t.type\t" << CurrentFnName << ", @function\n";
142 O << CurrentFnName << ":\n";
144 // Print out code for the function.
145 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
147 // Print a label for the basic block if there are any predecessors.
148 if (!I->pred_empty()) {
149 printBasicBlockLabel(I, true, true);
152 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
154 // Print the assembly for the instruction.
155 printMachineInstruction(II);
159 // We didn't modify anything.
163 void IA64AsmPrinter::printOp(const MachineOperand &MO,
164 bool isBRCALLinsn /* = false */) {
165 const TargetRegisterInfo &RI = *TM.getRegisterInfo();
166 switch (MO.getType()) {
167 case MachineOperand::MO_Register:
168 O << RI.get(MO.getReg()).AsmName;
171 case MachineOperand::MO_Immediate:
174 case MachineOperand::MO_MachineBasicBlock:
175 printBasicBlockLabel(MO.getMBB());
177 case MachineOperand::MO_ConstantPoolIndex: {
178 O << "@gprel(" << TAI->getPrivateGlobalPrefix()
179 << "CPI" << getFunctionNumber() << "_" << MO.getIndex() << ")";
183 case MachineOperand::MO_GlobalAddress: {
185 // functions need @ltoff(@fptr(fn_name)) form
186 GlobalValue *GV = MO.getGlobal();
187 Function *F = dyn_cast<Function>(GV);
189 bool Needfptr=false; // if we're computing an address @ltoff(X), do
190 // we need to decorate it so it becomes
191 // @ltoff(@fptr(X)) ?
192 if (F && !isBRCALLinsn /*&& F->isDeclaration()*/)
195 // if this is the target of a call instruction, we should define
196 // the function somewhere (GNU gas has no problem without this, but
197 // Intel ias rightly complains of an 'undefined symbol')
199 if (F /*&& isBRCALLinsn*/ && F->isDeclaration())
200 ExternalFunctionNames.insert(Mang->getValueName(MO.getGlobal()));
202 if (GV->isDeclaration()) // e.g. stuff like 'stdin'
203 ExternalObjectNames.insert(Mang->getValueName(MO.getGlobal()));
209 O << Mang->getValueName(MO.getGlobal());
211 if (Needfptr && !isBRCALLinsn)
212 O << "#))"; // close both fptr( and ltoff(
215 O << "#)"; // close only fptr(
217 O << "#)"; // close only ltoff(
220 int Offset = MO.getOffset();
222 O << " + " << Offset;
224 O << " - " << -Offset;
227 case MachineOperand::MO_ExternalSymbol:
228 O << MO.getSymbolName();
229 ExternalFunctionNames.insert(MO.getSymbolName());
232 O << "<AsmPrinter: unknown operand type: " << MO.getType() << " >"; return;
236 /// printMachineInstruction -- Print out a single IA64 LLVM instruction
237 /// MI to the current output stream.
239 void IA64AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
242 // Call the autogenerated instruction printer routines.
243 printInstruction(MI);
246 bool IA64AsmPrinter::doInitialization(Module &M) {
247 bool Result = AsmPrinter::doInitialization(M);
249 O << "\n.ident \"LLVM-ia64\"\n\n"
250 << "\t.psr lsb\n" // should be "msb" on HP-UX, for starters
252 << "\t.psr abi64\n"; // we only support 64 bits for now
256 void IA64AsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
257 const TargetData *TD = TM.getTargetData();
259 if (!GVar->hasInitializer())
260 return; // External global require no code
262 // Check to see if this is a special global used by LLVM, if so, emit it.
263 if (EmitSpecialLLVMGlobal(GVar))
267 std::string name = Mang->getValueName(GVar);
268 Constant *C = GVar->getInitializer();
269 unsigned Size = TD->getABITypeSize(C->getType());
270 unsigned Align = TD->getPreferredAlignmentLog(GVar);
272 printVisibility(name, GVar->getVisibility());
274 SwitchToSection(TAI->SectionForGlobal(GVar));
276 if (C->isNullValue() && !GVar->hasSection()) {
277 if (!GVar->isThreadLocal() &&
278 (GVar->hasInternalLinkage() || GVar->isWeakForLinker())) {
279 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
281 if (GVar->hasInternalLinkage()) {
282 O << "\t.lcomm " << name << "#," << Size
283 << ',' << (1 << Align);
286 O << "\t.common " << name << "#," << Size
287 << ',' << (1 << Align);
295 switch (GVar->getLinkage()) {
296 case GlobalValue::LinkOnceLinkage:
297 case GlobalValue::CommonLinkage:
298 case GlobalValue::WeakLinkage:
299 // Nonnull linkonce -> weak
300 O << "\t.weak " << name << '\n';
302 case GlobalValue::AppendingLinkage:
303 // FIXME: appending linkage variables should go into a section of
304 // their name or something. For now, just emit them as external.
305 case GlobalValue::ExternalLinkage:
306 // If external or appending, declare as a global symbol
307 O << TAI->getGlobalDirective() << name << '\n';
309 case GlobalValue::InternalLinkage:
311 case GlobalValue::GhostLinkage:
312 cerr << "GhostLinkage cannot appear in IA64AsmPrinter!\n";
314 case GlobalValue::DLLImportLinkage:
315 cerr << "DLLImport linkage is not supported by this target!\n";
317 case GlobalValue::DLLExportLinkage:
318 cerr << "DLLExport linkage is not supported by this target!\n";
321 assert(0 && "Unknown linkage type!");
324 EmitAlignment(Align, GVar);
326 if (TAI->hasDotTypeDotSizeDirective()) {
327 O << "\t.type " << name << ",@object\n";
328 O << "\t.size " << name << ',' << Size << '\n';
332 EmitGlobalConstant(C);
336 bool IA64AsmPrinter::doFinalization(Module &M) {
337 // Print out module-level global variables here.
338 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
340 printModuleLevelGV(I);
342 // we print out ".global X \n .type X, @function" for each external function
343 O << "\n\n// br.call targets referenced (and not defined) above: \n";
344 for (std::set<std::string>::iterator i = ExternalFunctionNames.begin(),
345 e = ExternalFunctionNames.end(); i!=e; ++i) {
346 O << "\t.global " << *i << "\n\t.type " << *i << ", @function\n";
350 // we print out ".global X \n .type X, @object" for each external object
351 O << "\n\n// (external) symbols referenced (and not defined) above: \n";
352 for (std::set<std::string>::iterator i = ExternalObjectNames.begin(),
353 e = ExternalObjectNames.end(); i!=e; ++i) {
354 O << "\t.global " << *i << "\n\t.type " << *i << ", @object\n";
358 return AsmPrinter::doFinalization(M);
361 /// createIA64CodePrinterPass - Returns a pass that prints the IA64
362 /// assembly code for a MachineFunction to the given output stream, using
363 /// the given target machine description.
365 FunctionPass *llvm::createIA64CodePrinterPass(raw_ostream &o,
366 IA64TargetMachine &tm) {
367 return new IA64AsmPrinter(o, tm, tm.getTargetAsmInfo());