1 //===-- SparcV8AsmPrinter.cpp - SparcV8 LLVM assembly writer --------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the 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 GAS-format Sparc V8 assembly language.
13 //===----------------------------------------------------------------------===//
16 #include "SparcV8InstrInfo.h"
17 #include "llvm/Constants.h"
18 #include "llvm/DerivedTypes.h"
19 #include "llvm/Module.h"
20 #include "llvm/Assembly/Writer.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/TargetMachine.h"
26 #include "llvm/Support/Mangler.h"
27 #include "llvm/ADT/Statistic.h"
28 #include "llvm/ADT/StringExtras.h"
29 #include "llvm/Support/CommandLine.h"
30 #include "llvm/Support/MathExtras.h"
35 Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
37 struct SparcV8AsmPrinter : public AsmPrinter {
38 SparcV8AsmPrinter(std::ostream &O, TargetMachine &TM) : AsmPrinter(O, TM) {
39 Data16bitsDirective = "\t.half\t";
40 Data32bitsDirective = "\t.word\t";
41 Data64bitsDirective = 0; // .xword is only supported by V9.
42 ZeroDirective = 0; // no .zero or .space!
44 ConstantPoolSection = "\t.section \".rodata\",#alloc\n";
47 /// We name each basic block in a Function with a unique number, so
48 /// that we can consistently refer to them later. This is cleared
49 /// at the beginning of each call to runOnMachineFunction().
51 typedef std::map<const Value *, unsigned> ValueMapTy;
52 ValueMapTy NumberForBB;
54 virtual const char *getPassName() const {
55 return "SparcV8 Assembly Printer";
58 void printOperand(const MachineInstr *MI, int opNum);
59 void printMemOperand(const MachineInstr *MI, int opNum);
60 bool printInstruction(const MachineInstr *MI); // autogenerated.
61 bool runOnMachineFunction(MachineFunction &F);
62 bool doInitialization(Module &M);
63 bool doFinalization(Module &M);
65 } // end of anonymous namespace
67 #include "SparcV8GenAsmWriter.inc"
69 /// createSparcV8CodePrinterPass - Returns a pass that prints the SparcV8
70 /// assembly code for a MachineFunction to the given output stream,
71 /// using the given target machine description. This should work
72 /// regardless of whether the function is in SSA form.
74 FunctionPass *llvm::createSparcV8CodePrinterPass (std::ostream &o,
76 return new SparcV8AsmPrinter(o, tm);
79 /// runOnMachineFunction - This uses the printMachineInstruction()
80 /// method to print assembly for each instruction.
82 bool SparcV8AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
83 SetupMachineFunction(MF);
85 // Print out constants referenced by the function
86 EmitConstantPool(MF.getConstantPool());
88 // BBNumber is used here so that a given Printer will never give two
89 // BBs the same name. (If you have a better way, please let me know!)
90 static unsigned BBNumber = 0;
93 // What's my mangled name?
94 CurrentFnName = Mang->getValueName(MF.getFunction());
96 // Print out labels for the function.
99 O << "\t.globl\t" << CurrentFnName << "\n";
100 O << "\t.type\t" << CurrentFnName << ", #function\n";
101 O << CurrentFnName << ":\n";
103 // Number each basic block so that we can consistently refer to them
104 // in PC-relative references.
106 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
108 NumberForBB[I->getBasicBlock()] = BBNumber++;
111 // Print out code for the function.
112 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
114 // Print a label for the basic block.
116 O << ".LBB" << Mang->getValueName(MF.getFunction ())
117 << "_" << I->getNumber () << ":\t! "
118 << I->getBasicBlock ()->getName () << "\n";
119 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
121 // Print the assembly for the instruction.
123 printInstruction(II);
128 // We didn't modify anything.
132 void SparcV8AsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
133 const MachineOperand &MO = MI->getOperand (opNum);
134 const MRegisterInfo &RI = *TM.getRegisterInfo();
135 bool CloseParen = false;
136 if (MI->getOpcode() == V8::SETHIi && !MO.isRegister() && !MO.isImmediate()) {
139 } else if ((MI->getOpcode() == V8::ORri || MI->getOpcode() == V8::ADDri)
140 && !MO.isRegister() && !MO.isImmediate()) {
144 switch (MO.getType()) {
145 case MachineOperand::MO_VirtualRegister:
146 if (Value *V = MO.getVRegValueOrNull()) {
147 O << "<" << V->getName() << ">";
151 case MachineOperand::MO_MachineRegister:
152 if (MRegisterInfo::isPhysicalRegister(MO.getReg()))
153 O << "%" << LowercaseString (RI.get(MO.getReg()).Name);
155 O << "%reg" << MO.getReg();
158 case MachineOperand::MO_SignExtendedImmed:
159 case MachineOperand::MO_UnextendedImmed:
160 O << (int)MO.getImmedValue();
162 case MachineOperand::MO_MachineBasicBlock: {
163 MachineBasicBlock *MBBOp = MO.getMachineBasicBlock();
164 O << ".LBB" << Mang->getValueName(MBBOp->getParent()->getFunction())
165 << "_" << MBBOp->getNumber () << "\t! "
166 << MBBOp->getBasicBlock ()->getName ();
169 case MachineOperand::MO_PCRelativeDisp:
170 std::cerr << "Shouldn't use addPCDisp() when building SparcV8 MachineInstrs";
173 case MachineOperand::MO_GlobalAddress:
174 O << Mang->getValueName(MO.getGlobal());
176 case MachineOperand::MO_ExternalSymbol:
177 O << MO.getSymbolName();
179 case MachineOperand::MO_ConstantPoolIndex:
180 O << PrivateGlobalPrefix << "CPI" << getFunctionNumber() << "_"
181 << MO.getConstantPoolIndex();
184 O << "<unknown operand type>"; abort (); break;
186 if (CloseParen) O << ")";
189 void SparcV8AsmPrinter::printMemOperand(const MachineInstr *MI, int opNum) {
190 printOperand(MI, opNum);
191 MachineOperand::MachineOperandType OpTy = MI->getOperand(opNum+1).getType();
193 if ((OpTy == MachineOperand::MO_VirtualRegister ||
194 OpTy == MachineOperand::MO_MachineRegister) &&
195 MI->getOperand(opNum+1).getReg() == V8::G0)
196 return; // don't print "+%g0"
197 if ((OpTy == MachineOperand::MO_SignExtendedImmed ||
198 OpTy == MachineOperand::MO_UnextendedImmed) &&
199 MI->getOperand(opNum+1).getImmedValue() == 0)
200 return; // don't print "+0"
203 if (OpTy == MachineOperand::MO_GlobalAddress ||
204 OpTy == MachineOperand::MO_ConstantPoolIndex) {
206 printOperand(MI, opNum+1);
209 printOperand(MI, opNum+1);
214 bool SparcV8AsmPrinter::doInitialization(Module &M) {
215 Mang = new Mangler(M);
216 return false; // success
219 bool SparcV8AsmPrinter::doFinalization(Module &M) {
220 const TargetData &TD = TM.getTargetData();
222 // Print out module-level global variables here.
223 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I)
224 if (I->hasInitializer()) { // External global require no code
226 std::string name = Mang->getValueName(I);
227 Constant *C = I->getInitializer();
228 unsigned Size = TD.getTypeSize(C->getType());
229 unsigned Align = TD.getTypeAlignment(C->getType());
231 if (C->isNullValue() &&
232 (I->hasLinkOnceLinkage() || I->hasInternalLinkage() ||
233 I->hasWeakLinkage() /* FIXME: Verify correct */)) {
234 SwitchSection(".data", I);
235 if (I->hasInternalLinkage())
236 O << "\t.local " << name << "\n";
238 O << "\t.comm " << name << "," << TD.getTypeSize(C->getType())
239 << "," << (unsigned)TD.getTypeAlignment(C->getType());
241 WriteAsOperand(O, I, true, true, &M);
244 switch (I->getLinkage()) {
245 case GlobalValue::LinkOnceLinkage:
246 case GlobalValue::WeakLinkage: // FIXME: Verify correct for weak.
247 // Nonnull linkonce -> weak
248 O << "\t.weak " << name << "\n";
249 SwitchSection("", I);
250 O << "\t.section\t\".llvm.linkonce.d." << name
251 << "\",\"aw\",@progbits\n";
254 case GlobalValue::AppendingLinkage:
255 // FIXME: appending linkage variables should go into a section of
256 // their name or something. For now, just emit them as external.
257 case GlobalValue::ExternalLinkage:
258 // If external or appending, declare as a global symbol
259 O << "\t.globl " << name << "\n";
261 case GlobalValue::InternalLinkage:
262 if (C->isNullValue())
263 SwitchSection(".bss", I);
265 SwitchSection(".data", I);
267 case GlobalValue::GhostLinkage:
268 std::cerr << "Should not have any unmaterialized functions!\n";
272 O << "\t.align " << Align << "\n";
273 O << "\t.type " << name << ",#object\n";
274 O << "\t.size " << name << "," << Size << "\n";
275 O << name << ":\t\t\t\t! ";
276 WriteAsOperand(O, I, true, true, &M);
278 WriteAsOperand(O, C, false, false, &M);
280 EmitGlobalConstant(C);
284 AsmPrinter::doFinalization(M);
285 return false; // success