1 //===-- IA64AsmPrinter.cpp - Print out IA64 LLVM as assembly --------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Duraid Madina and is distributed under the
6 // University of Illinois Open Source 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 excellent 'ias' assembler is bundled with
15 // the Intel C/C++ compiler for Itanium Linux.
17 //===----------------------------------------------------------------------===//
20 #include "IA64TargetMachine.h"
21 #include "llvm/Module.h"
22 #include "llvm/Type.h"
23 #include "llvm/Assembly/Writer.h"
24 #include "llvm/CodeGen/AsmPrinter.h"
25 #include "llvm/CodeGen/MachineConstantPool.h"
26 #include "llvm/CodeGen/MachineFunctionPass.h"
27 #include "llvm/CodeGen/ValueTypes.h"
28 #include "llvm/Target/TargetMachine.h"
29 #include "llvm/Support/Mangler.h"
30 #include "llvm/ADT/Statistic.h"
31 #include "llvm/Support/CommandLine.h"
35 Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
37 struct IA64SharedAsmPrinter : public AsmPrinter {
39 std::set<std::string> ExternalFunctionNames;
41 IA64SharedAsmPrinter(std::ostream &O, TargetMachine &TM)
42 : AsmPrinter(O, TM) { }
44 void printConstantPool(MachineConstantPool *MCP);
45 bool doFinalization(Module &M);
49 static bool isScale(const MachineOperand &MO) {
50 return MO.isImmediate() &&
51 (MO.getImmedValue() == 1 || MO.getImmedValue() == 2 ||
52 MO.getImmedValue() == 4 || MO.getImmedValue() == 8);
55 static bool isMem(const MachineInstr *MI, unsigned Op) {
56 if (MI->getOperand(Op).isFrameIndex()) return true;
57 if (MI->getOperand(Op).isConstantPoolIndex()) return true;
58 return Op+4 <= MI->getNumOperands() &&
59 MI->getOperand(Op ).isRegister() && isScale(MI->getOperand(Op+1)) &&
60 MI->getOperand(Op+2).isRegister() && (MI->getOperand(Op+3).isImmediate() ||
61 MI->getOperand(Op+3).isGlobalAddress());
64 // SwitchSection - Switch to the specified section of the executable if we are
67 static void SwitchSection(std::ostream &OS, std::string &CurSection,
68 const char *NewSection) {
69 if (CurSection != NewSection) {
70 CurSection = NewSection;
71 if (!CurSection.empty())
72 OS << "\t" << NewSection << "\n";
76 /// printConstantPool - Print to the current output stream assembly
77 /// representations of the constants in the constant pool MCP. This is
78 /// used to print out constants which have been "spilled to memory" by
79 /// the code generator.
81 void IA64SharedAsmPrinter::printConstantPool(MachineConstantPool *MCP) {
82 const std::vector<Constant*> &CP = MCP->getConstants();
83 const TargetData &TD = TM.getTargetData();
85 if (CP.empty()) return;
87 O << "\n\t.section .data\n"; // would be nice to have this rodata? hmmm
88 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
89 emitAlignment(TD.getTypeAlignmentShift(CP[i]->getType()));
90 O << ".CPI" << CurrentFnName << "_" << i << ":\t\t\t\t\t" << CommentString
92 emitGlobalConstant(CP[i]);
96 bool IA64SharedAsmPrinter::doFinalization(Module &M) {
97 const TargetData &TD = TM.getTargetData();
98 std::string CurSection;
100 // Print out module-level global variables here.
101 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
103 if (I->hasInitializer()) { // External global require no code
105 std::string name = Mang->getValueName(I);
106 Constant *C = I->getInitializer();
107 unsigned Size = TD.getTypeSize(C->getType());
108 unsigned Align = TD.getTypeAlignmentShift(C->getType());
110 if (C->isNullValue() &&
111 (I->hasLinkOnceLinkage() || I->hasInternalLinkage() ||
112 I->hasWeakLinkage() /* FIXME: Verify correct */)) {
113 SwitchSection(O, CurSection, ".data");
114 if (I->hasInternalLinkage())
115 O << "\t.local " << name << "\n";
117 O << "\t.common " << name << "," << TD.getTypeSize(C->getType())
118 << "," << (1 << Align);
120 WriteAsOperand(O, I, true, true, &M);
123 switch (I->getLinkage()) {
124 case GlobalValue::LinkOnceLinkage:
125 case GlobalValue::WeakLinkage: // FIXME: Verify correct for weak.
126 // Nonnull linkonce -> weak
127 O << "\t.weak " << name << "\n";
128 SwitchSection(O, CurSection, "");
129 O << "\t.section\t.llvm.linkonce.d." << name
130 << ", \"aw\", \"progbits\"\n";
132 case GlobalValue::AppendingLinkage:
133 // FIXME: appending linkage variables should go into a section of
134 // their name or something. For now, just emit them as external.
135 case GlobalValue::ExternalLinkage:
136 // If external or appending, declare as a global symbol
137 O << "\t.global " << name << "\n";
139 case GlobalValue::InternalLinkage:
140 if (C->isNullValue())
141 SwitchSection(O, CurSection, ".data"); // FIXME: this was
142 // '.bss', but in ia64-land .bss means "nobits" (i.e. uninitialized)
145 SwitchSection(O, CurSection, ".data");
147 case GlobalValue::GhostLinkage:
148 std::cerr << "GhostLinkage cannot appear in IA64AsmPrinter!\n";
152 emitAlignment(Align);
153 O << "\t.type " << name << ",@object\n";
154 O << "\t.size " << name << "," << Size << "\n";
155 O << name << ":\t\t\t\t// ";
156 WriteAsOperand(O, I, true, true, &M);
158 WriteAsOperand(O, C, false, false, &M);
160 emitGlobalConstant(C);
164 // we print out ".global X \n .type X, @function" for each external function
165 O << "\n\n// br.call targets referenced (and not defined) above: \n";
166 for (std::set<std::string>::iterator i = ExternalFunctionNames.begin(),
167 e = ExternalFunctionNames.end(); i!=e; ++i) {
168 O << "\t.global " << *i << "\n\t.type " << *i << ", @function\n";
172 AsmPrinter::doFinalization(M);
173 return false; // success
177 struct IA64AsmPrinter : public IA64SharedAsmPrinter {
178 IA64AsmPrinter(std::ostream &O, TargetMachine &TM)
179 : IA64SharedAsmPrinter(O, TM) {
181 CommentString = "//";
182 Data8bitsDirective = "\tdata1\t";
183 Data16bitsDirective = "\tdata2\t";
184 Data32bitsDirective = "\tdata4\t";
185 Data64bitsDirective = "\tdata8\t";
186 ZeroDirective = "\t.skip\t";
187 AsciiDirective = "\tstring\t";
191 virtual const char *getPassName() const {
192 return "IA64 Assembly Printer";
195 /// printInstruction - This method is automatically generated by tablegen
196 /// from the instruction set description. This method returns true if the
197 /// machine instruction was sufficiently described to print it, otherwise it
199 bool printInstruction(const MachineInstr *MI);
201 // This method is used by the tablegen'erated instruction printer.
202 void printOperand(const MachineInstr *MI, unsigned OpNo, MVT::ValueType VT){
203 const MachineOperand &MO = MI->getOperand(OpNo);
204 if (MO.getType() == MachineOperand::MO_MachineRegister) {
205 assert(MRegisterInfo::isPhysicalRegister(MO.getReg())&&"Not physref??");
206 //XXX Bug Workaround: See note in Printer::doInitialization about %.
207 O << TM.getRegisterInfo()->get(MO.getReg()).Name;
213 void printS16ImmOperand(const MachineInstr *MI, unsigned OpNo,
215 O << (short)MI->getOperand(OpNo).getImmedValue();
217 void printU16ImmOperand(const MachineInstr *MI, unsigned OpNo,
219 O << (unsigned short)MI->getOperand(OpNo).getImmedValue();
221 void printS21ImmOperand(const MachineInstr *MI, unsigned OpNo,
223 O << (int)MI->getOperand(OpNo).getImmedValue(); // FIXME (21, not 32!)
225 void printS32ImmOperand(const MachineInstr *MI, unsigned OpNo,
227 O << (int)MI->getOperand(OpNo).getImmedValue();
229 void printU32ImmOperand(const MachineInstr *MI, unsigned OpNo,
231 O << (unsigned int)MI->getOperand(OpNo).getImmedValue();
233 void printU64ImmOperand(const MachineInstr *MI, unsigned OpNo,
235 O << (uint64_t)MI->getOperand(OpNo).getImmedValue();
238 void printCallOperand(const MachineInstr *MI, unsigned OpNo,
240 printOp(MI->getOperand(OpNo), true); // this is a br.call instruction
243 void printMachineInstruction(const MachineInstr *MI);
244 void printOp(const MachineOperand &MO, bool isBRCALLinsn= false);
245 bool runOnMachineFunction(MachineFunction &F);
246 bool doInitialization(Module &M);
248 } // end of anonymous namespace
251 // Include the auto-generated portion of the assembly writer.
252 #include "IA64GenAsmWriter.inc"
255 /// runOnMachineFunction - This uses the printMachineInstruction()
256 /// method to print assembly for each instruction.
258 bool IA64AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
259 setupMachineFunction(MF);
262 // Print out constants referenced by the function
263 printConstantPool(MF.getConstantPool());
265 // Print out labels for the function.
266 O << "\n\t.section .text, \"ax\", \"progbits\"\n";
267 // ^^ means "Allocated instruXions in mem, initialized"
269 O << "\t.global\t" << CurrentFnName << "\n";
270 O << "\t.type\t" << CurrentFnName << ", @function\n";
271 O << CurrentFnName << ":\n";
273 // Print out code for the function.
274 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
276 // Print a label for the basic block if there are any predecessors.
277 if (I->pred_begin() != I->pred_end())
278 O << ".LBB" << CurrentFnName << "_" << I->getNumber() << ":\t"
279 << CommentString << " " << I->getBasicBlock()->getName() << "\n";
280 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
282 // Print the assembly for the instruction.
284 printMachineInstruction(II);
288 // We didn't modify anything.
292 void IA64AsmPrinter::printOp(const MachineOperand &MO,
293 bool isBRCALLinsn /* = false */) {
294 const MRegisterInfo &RI = *TM.getRegisterInfo();
295 switch (MO.getType()) {
296 case MachineOperand::MO_VirtualRegister:
297 if (Value *V = MO.getVRegValueOrNull()) {
298 O << "<" << V->getName() << ">";
302 case MachineOperand::MO_MachineRegister:
303 case MachineOperand::MO_CCRegister: {
304 O << RI.get(MO.getReg()).Name;
308 case MachineOperand::MO_SignExtendedImmed:
309 case MachineOperand::MO_UnextendedImmed:
310 O << /*(unsigned int)*/MO.getImmedValue();
312 case MachineOperand::MO_MachineBasicBlock: {
313 MachineBasicBlock *MBBOp = MO.getMachineBasicBlock();
314 O << ".LBB" << Mang->getValueName(MBBOp->getParent()->getFunction())
315 << "_" << MBBOp->getNumber () << "\t// "
316 << MBBOp->getBasicBlock ()->getName ();
319 case MachineOperand::MO_PCRelativeDisp:
320 std::cerr << "Shouldn't use addPCDisp() when building IA64 MachineInstrs";
324 case MachineOperand::MO_ConstantPoolIndex: {
325 O << "@gprel(.CPI" << CurrentFnName << "_"
326 << MO.getConstantPoolIndex() << ")";
330 case MachineOperand::MO_GlobalAddress: {
332 // functions need @ltoff(@fptr(fn_name)) form
333 GlobalValue *GV = MO.getGlobal();
334 Function *F = dyn_cast<Function>(GV);
336 bool Needfptr=false; // if we're computing an address @ltoff(X), do
337 // we need to decorate it so it becomes
338 // @ltoff(@fptr(X)) ?
339 if(F && !isBRCALLinsn && F->isExternal())
342 // if this is the target of a call instruction, we should define
343 // the function somewhere (GNU gas has no problem without this, but
344 // Intel ias rightly complains of an 'undefined symbol')
346 if(F && isBRCALLinsn && F->isExternal())
347 ExternalFunctionNames.insert(Mang->getValueName(MO.getGlobal()));
353 O << Mang->getValueName(MO.getGlobal());
355 O << ")"; // close fptr(
357 O << ")"; // close ltoff(
358 int Offset = MO.getOffset();
360 O << " + " << Offset;
362 O << " - " << -Offset;
365 case MachineOperand::MO_ExternalSymbol:
366 O << MO.getSymbolName();
369 O << "<AsmPrinter: unknown operand type: " << MO.getType() << " >"; return;
373 /// printMachineInstruction -- Print out a single IA64 LLVM instruction
374 /// MI to the current output stream.
376 void IA64AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
380 // Call the autogenerated instruction printer routines.
381 printInstruction(MI);
384 bool IA64AsmPrinter::doInitialization(Module &M) {
385 AsmPrinter::doInitialization(M);
387 O << "\t.psr lsb\n" // should be "msb" on HP-UX, for starters
389 << "\t.psr abi64\n"; // we only support 64 bits for now
393 /// createIA64CodePrinterPass - Returns a pass that prints the IA64
394 /// assembly code for a MachineFunction to the given output stream, using
395 /// the given target machine description.
397 FunctionPass *llvm::createIA64CodePrinterPass(std::ostream &o,TargetMachine &tm){
398 return new IA64AsmPrinter(o, tm);