1 //===-- SparcAsmPrinter.cpp - Sparc 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 SPARC assembly language.
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "asm-printer"
17 #include "SparcInstrInfo.h"
18 #include "llvm/Constants.h"
19 #include "llvm/DerivedTypes.h"
20 #include "llvm/Module.h"
21 #include "llvm/CodeGen/AsmPrinter.h"
22 #include "llvm/CodeGen/MachineFunctionPass.h"
23 #include "llvm/CodeGen/MachineConstantPool.h"
24 #include "llvm/CodeGen/MachineInstr.h"
25 #include "llvm/Target/TargetAsmInfo.h"
26 #include "llvm/Target/TargetData.h"
27 #include "llvm/Target/TargetMachine.h"
28 #include "llvm/Support/Mangler.h"
29 #include "llvm/ADT/Statistic.h"
30 #include "llvm/ADT/StringExtras.h"
31 #include "llvm/Support/CommandLine.h"
32 #include "llvm/Support/MathExtras.h"
38 STATISTIC(EmittedInsts, "Number of machine instrs printed");
41 struct VISIBILITY_HIDDEN SparcAsmPrinter : public AsmPrinter {
42 SparcAsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
43 : AsmPrinter(O, TM, T) {
46 /// We name each basic block in a Function with a unique number, so
47 /// that we can consistently refer to them later. This is cleared
48 /// at the beginning of each call to runOnMachineFunction().
50 typedef std::map<const Value *, unsigned> ValueMapTy;
51 ValueMapTy NumberForBB;
53 virtual const char *getPassName() const {
54 return "Sparc Assembly Printer";
57 void printModuleLevelGV(const GlobalVariable* GVar);
58 void printOperand(const MachineInstr *MI, int opNum);
59 void printMemOperand(const MachineInstr *MI, int opNum,
60 const char *Modifier = 0);
61 void printCCOperand(const MachineInstr *MI, int opNum);
63 bool printInstruction(const MachineInstr *MI); // autogenerated.
64 bool runOnMachineFunction(MachineFunction &F);
65 std::string getSectionForFunction(const Function &F) const;
66 bool doInitialization(Module &M);
67 bool doFinalization(Module &M);
69 } // end of anonymous namespace
71 #include "SparcGenAsmWriter.inc"
73 /// createSparcCodePrinterPass - Returns a pass that prints the SPARC
74 /// assembly code for a MachineFunction to the given output stream,
75 /// using the given target machine description. This should work
76 /// regardless of whether the function is in SSA form.
78 FunctionPass *llvm::createSparcCodePrinterPass(std::ostream &o,
80 return new SparcAsmPrinter(o, tm, tm.getTargetAsmInfo());
83 // Substitute old hook with new one temporary
84 std::string SparcAsmPrinter::getSectionForFunction(const Function &F) const {
85 return TAI->SectionForGlobal(&F);
88 /// runOnMachineFunction - This uses the printInstruction()
89 /// method to print assembly for each instruction.
91 bool SparcAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
92 SetupMachineFunction(MF);
94 // Print out constants referenced by the function
95 EmitConstantPool(MF.getConstantPool());
97 // BBNumber is used here so that a given Printer will never give two
98 // BBs the same name. (If you have a better way, please let me know!)
99 static unsigned BBNumber = 0;
102 // What's my mangled name?
103 CurrentFnName = Mang->getValueName(MF.getFunction());
105 // Print out the label for the function.
106 const Function *F = MF.getFunction();
107 SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
109 O << "\t.globl\t" << CurrentFnName << '\n';
110 O << "\t.type\t" << CurrentFnName << ", #function\n";
111 O << CurrentFnName << ":\n";
113 // Number each basic block so that we can consistently refer to them
114 // in PC-relative references.
115 // FIXME: Why not use the MBB numbers?
117 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
119 NumberForBB[I->getBasicBlock()] = BBNumber++;
122 // Print out code for the function.
123 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
125 // Print a label for the basic block.
126 if (I != MF.begin()) {
127 printBasicBlockLabel(I, true, true);
130 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
132 // Print the assembly for the instruction.
133 printInstruction(II);
138 // We didn't modify anything.
142 void SparcAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
143 const MachineOperand &MO = MI->getOperand (opNum);
144 const TargetRegisterInfo &RI = *TM.getRegisterInfo();
145 bool CloseParen = false;
146 if (MI->getOpcode() == SP::SETHIi && !MO.isRegister() && !MO.isImmediate()) {
149 } else if ((MI->getOpcode() == SP::ORri || MI->getOpcode() == SP::ADDri)
150 && !MO.isRegister() && !MO.isImmediate()) {
154 switch (MO.getType()) {
155 case MachineOperand::MO_Register:
156 if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
157 O << "%" << LowercaseString (RI.get(MO.getReg()).AsmName);
159 O << "%reg" << MO.getReg();
162 case MachineOperand::MO_Immediate:
163 O << (int)MO.getImm();
165 case MachineOperand::MO_MachineBasicBlock:
166 printBasicBlockLabel(MO.getMBB());
168 case MachineOperand::MO_GlobalAddress:
169 O << Mang->getValueName(MO.getGlobal());
171 case MachineOperand::MO_ExternalSymbol:
172 O << MO.getSymbolName();
174 case MachineOperand::MO_ConstantPoolIndex:
175 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
179 O << "<unknown operand type>"; abort (); break;
181 if (CloseParen) O << ")";
184 void SparcAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
185 const char *Modifier) {
186 printOperand(MI, opNum);
188 // If this is an ADD operand, emit it like normal operands.
189 if (Modifier && !strcmp(Modifier, "arith")) {
191 printOperand(MI, opNum+1);
195 if (MI->getOperand(opNum+1).isRegister() &&
196 MI->getOperand(opNum+1).getReg() == SP::G0)
197 return; // don't print "+%g0"
198 if (MI->getOperand(opNum+1).isImmediate() &&
199 MI->getOperand(opNum+1).getImm() == 0)
200 return; // don't print "+0"
203 if (MI->getOperand(opNum+1).isGlobalAddress() ||
204 MI->getOperand(opNum+1).isConstantPoolIndex()) {
206 printOperand(MI, opNum+1);
209 printOperand(MI, opNum+1);
213 void SparcAsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) {
214 int CC = (int)MI->getOperand(opNum).getImm();
215 O << SPARCCondCodeToString((SPCC::CondCodes)CC);
220 bool SparcAsmPrinter::doInitialization(Module &M) {
221 Mang = new Mangler(M);
222 return false; // success
225 bool SparcAsmPrinter::doFinalization(Module &M) {
226 // Print out module-level global variables here.
227 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
229 printModuleLevelGV(I);
233 return AsmPrinter::doFinalization(M);
236 void SparcAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
237 const TargetData *TD = TM.getTargetData();
239 if (!GVar->hasInitializer())
240 return; // External global require no code
242 // Check to see if this is a special global used by LLVM, if so, emit it.
243 if (EmitSpecialLLVMGlobal(GVar))
247 std::string SectionName = TAI->SectionForGlobal(GVar);
248 std::string name = Mang->getValueName(GVar);
249 Constant *C = GVar->getInitializer();
250 unsigned Size = TD->getABITypeSize(C->getType());
251 unsigned Align = TD->getPreferredAlignment(GVar);
253 // FIXME: ELF supports visibility
254 SwitchToDataSection(SectionName.c_str());
256 if (C->isNullValue() && !GVar->hasSection()) {
257 if (!GVar->isThreadLocal() &&
258 (GVar->hasInternalLinkage() || GVar->isWeakForLinker())) {
259 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
261 if (GVar->hasInternalLinkage())
262 O << "\t.local " << name << '\n';
264 O << TAI->getCOMMDirective() << name << ',' << Size;
265 if (TAI->getCOMMDirectiveTakesAlignment())
266 O << ',' << (1 << Align);
273 switch (GVar->getLinkage()) {
274 case GlobalValue::CommonLinkage:
275 case GlobalValue::LinkOnceLinkage:
276 case GlobalValue::WeakLinkage: // FIXME: Verify correct for weak.
277 // Nonnull linkonce -> weak
278 O << "\t.weak " << name << '\n';
280 case GlobalValue::AppendingLinkage:
281 // FIXME: appending linkage variables should go into a section of
282 // their name or something. For now, just emit them as external.
283 case GlobalValue::ExternalLinkage:
284 // If external or appending, declare as a global symbol
285 O << TAI->getGlobalDirective() << name << '\n';
287 case GlobalValue::InternalLinkage:
289 case GlobalValue::GhostLinkage:
290 cerr << "Should not have any unmaterialized functions!\n";
292 case GlobalValue::DLLImportLinkage:
293 cerr << "DLLImport linkage is not supported by this target!\n";
295 case GlobalValue::DLLExportLinkage:
296 cerr << "DLLExport linkage is not supported by this target!\n";
299 assert(0 && "Unknown linkage type!");
303 O << "\t.align " << Align << '\n';
305 if (TAI->hasDotTypeDotSizeDirective()) {
306 O << "\t.type " << name << ",#object\n";
307 O << "\t.size " << name << ',' << Size << '\n';
311 EmitGlobalConstant(C);