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/ADT/Statistic.h"
32 STATISTIC(EmittedInsts, "Number of machine instrs printed");
35 struct IA64AsmPrinter : public AsmPrinter {
36 std::set<std::string> ExternalFunctionNames, ExternalObjectNames;
38 IA64AsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
39 : AsmPrinter(O, TM, T) {
42 virtual const char *getPassName() const {
43 return "IA64 Assembly Printer";
46 /// printInstruction - This method is automatically generated by tablegen
47 /// from the instruction set description. This method returns true if the
48 /// machine instruction was sufficiently described to print it, otherwise it
50 bool printInstruction(const MachineInstr *MI);
52 // This method is used by the tablegen'erated instruction printer.
53 void printOperand(const MachineInstr *MI, unsigned OpNo){
54 const MachineOperand &MO = MI->getOperand(OpNo);
55 if (MO.getType() == MachineOperand::MO_Register) {
56 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
58 //XXX Bug Workaround: See note in Printer::doInitialization about %.
59 O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
65 void printS8ImmOperand(const MachineInstr *MI, unsigned OpNo) {
66 int val=(unsigned int)MI->getOperand(OpNo).getImm();
67 if(val>=128) val=val-256; // if negative, flip sign
70 void printS14ImmOperand(const MachineInstr *MI, unsigned OpNo) {
71 int val=(unsigned int)MI->getOperand(OpNo).getImm();
72 if(val>=8192) val=val-16384; // if negative, flip sign
75 void printS22ImmOperand(const MachineInstr *MI, unsigned OpNo) {
76 int val=(unsigned int)MI->getOperand(OpNo).getImm();
77 if(val>=2097152) val=val-4194304; // if negative, flip sign
80 void printU64ImmOperand(const MachineInstr *MI, unsigned OpNo) {
81 O << (uint64_t)MI->getOperand(OpNo).getImm();
83 void printS64ImmOperand(const MachineInstr *MI, unsigned OpNo) {
84 // XXX : nasty hack to avoid GPREL22 "relocation truncated to fit" linker
85 // errors - instead of add rX = @gprel(CPI<whatever>), r1;; we now
86 // emit movl rX = @gprel(CPI<whatever);;
88 // this gives us 64 bits instead of 22 (for the add long imm) to play
89 // with, which shuts up the linker. The problem is that the constant
90 // pool entries aren't immediates at this stage, so we check here.
91 // If it's an immediate, print it the old fashioned way. If it's
92 // not, we print it as a constant pool index.
93 if(MI->getOperand(OpNo).isImmediate()) {
94 O << (int64_t)MI->getOperand(OpNo).getImm();
95 } else { // this is a constant pool reference: FIXME: assert this
96 printOp(MI->getOperand(OpNo));
100 void printGlobalOperand(const MachineInstr *MI, unsigned OpNo) {
101 printOp(MI->getOperand(OpNo), false); // this is NOT a br.call instruction
104 void printCallOperand(const MachineInstr *MI, unsigned OpNo) {
105 printOp(MI->getOperand(OpNo), true); // this is a br.call instruction
108 std::string getSectionForFunction(const Function &F) const;
110 void printMachineInstruction(const MachineInstr *MI);
111 void printOp(const MachineOperand &MO, bool isBRCALLinsn= false);
112 void printModuleLevelGV(const GlobalVariable* GVar);
113 bool runOnMachineFunction(MachineFunction &F);
114 bool doInitialization(Module &M);
115 bool doFinalization(Module &M);
117 } // end of anonymous namespace
120 // Include the auto-generated portion of the assembly writer.
121 #include "IA64GenAsmWriter.inc"
124 // Substitute old hook with new one temporary
125 std::string IA64AsmPrinter::getSectionForFunction(const Function &F) const {
126 return TAI->SectionForGlobal(&F);
129 /// runOnMachineFunction - This uses the printMachineInstruction()
130 /// method to print assembly for each instruction.
132 bool IA64AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
133 SetupMachineFunction(MF);
136 // Print out constants referenced by the function
137 EmitConstantPool(MF.getConstantPool());
139 const Function *F = MF.getFunction();
140 SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
142 // Print out labels for the function.
144 O << "\t.global\t" << CurrentFnName << "\n";
145 O << "\t.type\t" << CurrentFnName << ", @function\n";
146 O << CurrentFnName << ":\n";
148 // Print out code for the function.
149 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
151 // Print a label for the basic block if there are any predecessors.
152 if (!I->pred_empty()) {
153 printBasicBlockLabel(I, true, true);
156 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
158 // Print the assembly for the instruction.
159 printMachineInstruction(II);
163 // We didn't modify anything.
167 void IA64AsmPrinter::printOp(const MachineOperand &MO,
168 bool isBRCALLinsn /* = false */) {
169 const TargetRegisterInfo &RI = *TM.getRegisterInfo();
170 switch (MO.getType()) {
171 case MachineOperand::MO_Register:
172 O << RI.get(MO.getReg()).AsmName;
175 case MachineOperand::MO_Immediate:
178 case MachineOperand::MO_MachineBasicBlock:
179 printBasicBlockLabel(MO.getMBB());
181 case MachineOperand::MO_ConstantPoolIndex: {
182 O << "@gprel(" << TAI->getPrivateGlobalPrefix()
183 << "CPI" << getFunctionNumber() << "_" << MO.getIndex() << ")";
187 case MachineOperand::MO_GlobalAddress: {
189 // functions need @ltoff(@fptr(fn_name)) form
190 GlobalValue *GV = MO.getGlobal();
191 Function *F = dyn_cast<Function>(GV);
193 bool Needfptr=false; // if we're computing an address @ltoff(X), do
194 // we need to decorate it so it becomes
195 // @ltoff(@fptr(X)) ?
196 if (F && !isBRCALLinsn /*&& F->isDeclaration()*/)
199 // if this is the target of a call instruction, we should define
200 // the function somewhere (GNU gas has no problem without this, but
201 // Intel ias rightly complains of an 'undefined symbol')
203 if (F /*&& isBRCALLinsn*/ && F->isDeclaration())
204 ExternalFunctionNames.insert(Mang->getValueName(MO.getGlobal()));
206 if (GV->isDeclaration()) // e.g. stuff like 'stdin'
207 ExternalObjectNames.insert(Mang->getValueName(MO.getGlobal()));
213 O << Mang->getValueName(MO.getGlobal());
215 if (Needfptr && !isBRCALLinsn)
216 O << "#))"; // close both fptr( and ltoff(
219 O << "#)"; // close only fptr(
221 O << "#)"; // close only ltoff(
224 int Offset = MO.getOffset();
226 O << " + " << Offset;
228 O << " - " << -Offset;
231 case MachineOperand::MO_ExternalSymbol:
232 O << MO.getSymbolName();
233 ExternalFunctionNames.insert(MO.getSymbolName());
236 O << "<AsmPrinter: unknown operand type: " << MO.getType() << " >"; return;
240 /// printMachineInstruction -- Print out a single IA64 LLVM instruction
241 /// MI to the current output stream.
243 void IA64AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
246 // Call the autogenerated instruction printer routines.
247 printInstruction(MI);
250 bool IA64AsmPrinter::doInitialization(Module &M) {
251 bool Result = AsmPrinter::doInitialization(M);
253 O << "\n.ident \"LLVM-ia64\"\n\n"
254 << "\t.psr lsb\n" // should be "msb" on HP-UX, for starters
256 << "\t.psr abi64\n"; // we only support 64 bits for now
260 void IA64AsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
261 const TargetData *TD = TM.getTargetData();
263 if (!GVar->hasInitializer())
264 return; // External global require no code
266 // Check to see if this is a special global used by LLVM, if so, emit it.
267 if (EmitSpecialLLVMGlobal(GVar))
271 std::string SectionName = TAI->SectionForGlobal(GVar);
272 std::string name = Mang->getValueName(GVar);
273 Constant *C = GVar->getInitializer();
274 unsigned Size = TD->getABITypeSize(C->getType());
275 unsigned Align = TD->getPreferredAlignmentLog(GVar);
277 // FIXME: ELF supports visibility
279 SwitchToDataSection(SectionName.c_str());
281 if (C->isNullValue() && !GVar->hasSection()) {
282 if (!GVar->isThreadLocal() &&
283 (GVar->hasInternalLinkage() || GVar->isWeakForLinker())) {
284 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
286 if (GVar->hasInternalLinkage()) {
287 O << "\t.lcomm " << name << "#," << Size
288 << "," << (1 << Align);
291 O << "\t.common " << name << "#," << Size
292 << "," << (1 << Align);
300 switch (GVar->getLinkage()) {
301 case GlobalValue::LinkOnceLinkage:
302 case GlobalValue::CommonLinkage:
303 case GlobalValue::WeakLinkage:
304 // Nonnull linkonce -> weak
305 O << "\t.weak " << name << "\n";
307 case GlobalValue::AppendingLinkage:
308 // FIXME: appending linkage variables should go into a section of
309 // their name or something. For now, just emit them as external.
310 case GlobalValue::ExternalLinkage:
311 // If external or appending, declare as a global symbol
312 O << TAI->getGlobalDirective() << name << "\n";
314 case GlobalValue::InternalLinkage:
316 case GlobalValue::GhostLinkage:
317 cerr << "GhostLinkage cannot appear in IA64AsmPrinter!\n";
319 case GlobalValue::DLLImportLinkage:
320 cerr << "DLLImport linkage is not supported by this target!\n";
322 case GlobalValue::DLLExportLinkage:
323 cerr << "DLLExport linkage is not supported by this target!\n";
326 assert(0 && "Unknown linkage type!");
329 EmitAlignment(Align);
331 if (TAI->hasDotTypeDotSizeDirective()) {
332 O << "\t.type " << name << ",@object\n";
333 O << "\t.size " << name << "," << Size << "\n";
336 O << name << ":\t\t\t\t// " << *C << "\n";
337 EmitGlobalConstant(C);
341 bool IA64AsmPrinter::doFinalization(Module &M) {
342 // Print out module-level global variables here.
343 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
345 printModuleLevelGV(I);
347 // we print out ".global X \n .type X, @function" for each external function
348 O << "\n\n// br.call targets referenced (and not defined) above: \n";
349 for (std::set<std::string>::iterator i = ExternalFunctionNames.begin(),
350 e = ExternalFunctionNames.end(); i!=e; ++i) {
351 O << "\t.global " << *i << "\n\t.type " << *i << ", @function\n";
355 // we print out ".global X \n .type X, @object" for each external object
356 O << "\n\n// (external) symbols referenced (and not defined) above: \n";
357 for (std::set<std::string>::iterator i = ExternalObjectNames.begin(),
358 e = ExternalObjectNames.end(); i!=e; ++i) {
359 O << "\t.global " << *i << "\n\t.type " << *i << ", @object\n";
363 return AsmPrinter::doFinalization(M);
366 /// createIA64CodePrinterPass - Returns a pass that prints the IA64
367 /// assembly code for a MachineFunction to the given output stream, using
368 /// the given target machine description.
370 FunctionPass *llvm::createIA64CodePrinterPass(std::ostream &o,
371 IA64TargetMachine &tm) {
372 return new IA64AsmPrinter(o, tm, tm.getTargetAsmInfo());