1 //===-- AlphaAsmPrinter.cpp - Alpha 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 Alpha assembly language.
13 //===----------------------------------------------------------------------===//
16 #include "AlphaInstrInfo.h"
17 #include "AlphaTargetMachine.h"
18 #include "llvm/Module.h"
19 #include "llvm/Type.h"
20 #include "llvm/Assembly/Writer.h"
21 #include "llvm/CodeGen/AsmPrinter.h"
22 #include "llvm/Target/TargetAsmInfo.h"
23 #include "llvm/Target/TargetMachine.h"
24 #include "llvm/Support/Mangler.h"
25 #include "llvm/ADT/Statistic.h"
30 Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
32 struct VISIBILITY_HIDDEN AlphaAsmPrinter : public AsmPrinter {
34 /// Unique incrementer for label values for referencing Global values.
38 AlphaAsmPrinter(std::ostream &o, TargetMachine &tm, const TargetAsmInfo *T)
39 : AsmPrinter(o, tm, T), LabelNumber(0) {
42 /// We name each basic block in a Function with a unique number, so
43 /// that we can consistently refer to them later. This is cleared
44 /// at the beginning of each call to runOnMachineFunction().
46 typedef std::map<const Value *, unsigned> ValueMapTy;
47 ValueMapTy NumberForBB;
48 std::string CurSection;
50 virtual const char *getPassName() const {
51 return "Alpha Assembly Printer";
53 bool printInstruction(const MachineInstr *MI);
54 void printOp(const MachineOperand &MO, bool IsCallOp = false);
55 void printOperand(const MachineInstr *MI, int opNum);
56 void printBaseOffsetPair (const MachineInstr *MI, int i, bool brackets=true);
57 void printMachineInstruction(const MachineInstr *MI);
58 bool runOnMachineFunction(MachineFunction &F);
59 bool doInitialization(Module &M);
60 bool doFinalization(Module &M);
62 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
63 unsigned AsmVariant, const char *ExtraCode);
64 bool PrintAsmMemoryOperand(const MachineInstr *MI,
67 const char *ExtraCode);
69 } // end of anonymous namespace
71 /// createAlphaCodePrinterPass - Returns a pass that prints the Alpha
72 /// assembly code for a MachineFunction to the given output stream,
73 /// using the given target machine description. This should work
74 /// regardless of whether the function is in SSA form.
76 FunctionPass *llvm::createAlphaCodePrinterPass(std::ostream &o,
78 return new AlphaAsmPrinter(o, tm, tm.getTargetAsmInfo());
81 #include "AlphaGenAsmWriter.inc"
83 void AlphaAsmPrinter::printOperand(const MachineInstr *MI, int opNum)
85 const MachineOperand &MO = MI->getOperand(opNum);
86 if (MO.getType() == MachineOperand::MO_Register) {
87 assert(MRegisterInfo::isPhysicalRegister(MO.getReg())&&"Not physreg??");
88 O << TM.getRegisterInfo()->get(MO.getReg()).Name;
89 } else if (MO.isImmediate()) {
90 O << MO.getImmedValue();
91 assert(MO.getImmedValue() < (1 << 30));
98 void AlphaAsmPrinter::printOp(const MachineOperand &MO, bool IsCallOp) {
99 const MRegisterInfo &RI = *TM.getRegisterInfo();
102 switch (MO.getType()) {
103 case MachineOperand::MO_Register:
104 O << RI.get(MO.getReg()).Name;
107 case MachineOperand::MO_Immediate:
108 std::cerr << "printOp() does not handle immediate values\n";
112 case MachineOperand::MO_MachineBasicBlock:
113 printBasicBlockLabel(MO.getMachineBasicBlock());
116 case MachineOperand::MO_ConstantPoolIndex:
117 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
118 << MO.getConstantPoolIndex();
121 case MachineOperand::MO_ExternalSymbol:
122 O << MO.getSymbolName();
125 case MachineOperand::MO_GlobalAddress:
126 O << Mang->getValueName(MO.getGlobal());
129 case MachineOperand::MO_JumpTableIndex:
130 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
131 << '_' << MO.getJumpTableIndex();
135 O << "<unknown operand type: " << MO.getType() << ">";
140 /// printMachineInstruction -- Print out a single Alpha MI to
141 /// the current output stream.
143 void AlphaAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
145 if (printInstruction(MI))
146 return; // Printer was automatically generated
148 assert(0 && "Unhandled instruction in asm writer!");
154 /// runOnMachineFunction - This uses the printMachineInstruction()
155 /// method to print assembly for each instruction.
157 bool AlphaAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
158 SetupMachineFunction(MF);
161 // Print out constants referenced by the function
162 EmitConstantPool(MF.getConstantPool());
164 // Print out jump tables referenced by the function
165 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
167 // Print out labels for the function.
168 const Function *F = MF.getFunction();
169 SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
172 switch (F->getLinkage()) {
173 default: assert(0 && "Unknown linkage type!");
174 case Function::InternalLinkage: // Symbols default to internal.
176 case Function::ExternalLinkage:
177 O << "\t.globl " << CurrentFnName << "\n";
179 case Function::WeakLinkage:
180 case Function::LinkOnceLinkage:
181 O << "\t.weak " << CurrentFnName << "\n";
185 O << "\t.ent " << CurrentFnName << "\n";
187 O << CurrentFnName << ":\n";
189 // Print out code for the function.
190 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
192 printBasicBlockLabel(I, true);
194 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
196 // Print the assembly for the instruction.
198 printMachineInstruction(II);
203 O << "\t.end " << CurrentFnName << "\n";
205 // We didn't modify anything.
209 bool AlphaAsmPrinter::doInitialization(Module &M)
211 AsmPrinter::doInitialization(M);
212 if(TM.getSubtarget<AlphaSubtarget>().hasF2I()
213 || TM.getSubtarget<AlphaSubtarget>().hasCT())
214 O << "\t.arch ev6\n";
216 O << "\t.arch ev56\n";
217 O << "\t.set noat\n";
221 bool AlphaAsmPrinter::doFinalization(Module &M) {
222 const TargetData *TD = TM.getTargetData();
224 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I)
225 if (I->hasInitializer()) { // External global require no code
226 // Check to see if this is a special global used by LLVM, if so, emit it.
227 if (EmitSpecialLLVMGlobal(I))
231 std::string name = Mang->getValueName(I);
232 Constant *C = I->getInitializer();
233 unsigned Size = TD->getTypeSize(C->getType());
234 // unsigned Align = TD->getTypeAlignmentShift(C->getType());
235 unsigned Align = getPreferredAlignmentLog(I);
237 if (C->isNullValue() &&
238 (I->hasLinkOnceLinkage() || I->hasInternalLinkage() ||
239 I->hasWeakLinkage() /* FIXME: Verify correct */)) {
240 SwitchToDataSection("\t.section .data", I);
241 if (I->hasInternalLinkage())
242 O << "\t.local " << name << "\n";
244 O << "\t.comm " << name << "," << TD->getTypeSize(C->getType())
245 << "," << (1 << Align)
248 switch (I->getLinkage()) {
249 case GlobalValue::LinkOnceLinkage:
250 case GlobalValue::WeakLinkage: // FIXME: Verify correct for weak.
251 // Nonnull linkonce -> weak
252 O << "\t.weak " << name << "\n";
253 O << "\t.section\t.llvm.linkonce.d." << name << ",\"aw\",@progbits\n";
254 SwitchToDataSection("", I);
256 case GlobalValue::AppendingLinkage:
257 // FIXME: appending linkage variables should go into a section of
258 // their name or something. For now, just emit them as external.
259 case GlobalValue::ExternalLinkage:
260 // If external or appending, declare as a global symbol
261 O << "\t.globl " << name << "\n";
263 case GlobalValue::InternalLinkage:
264 SwitchToDataSection(C->isNullValue() ? "\t.section .bss" :
265 "\t.section .data", I);
267 case GlobalValue::GhostLinkage:
268 std::cerr << "GhostLinkage cannot appear in AlphaAsmPrinter!\n";
270 case GlobalValue::DLLImportLinkage:
271 std::cerr << "DLLImport linkage is not supported by this target!\n";
273 case GlobalValue::DLLExportLinkage:
274 std::cerr << "DLLExport linkage is not supported by this target!\n";
277 assert(0 && "Unknown linkage type!");
280 EmitAlignment(Align);
281 O << "\t.type " << name << ",@object\n";
282 O << "\t.size " << name << "," << Size << "\n";
284 EmitGlobalConstant(C);
288 AsmPrinter::doFinalization(M);
292 /// PrintAsmOperand - Print out an operand for an inline asm expression.
294 bool AlphaAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
296 const char *ExtraCode) {
297 printOperand(MI, OpNo);
301 bool AlphaAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
304 const char *ExtraCode) {
305 if (ExtraCode && ExtraCode[0])
306 return true; // Unknown modifier.
308 printOperand(MI, OpNo);