1 //===-- AlphaAsmPrinter.cpp - Alpha 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 Alpha assembly language.
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "asm-printer"
17 #include "AlphaInstrInfo.h"
18 #include "AlphaTargetMachine.h"
19 #include "llvm/Module.h"
20 #include "llvm/MDNode.h"
21 #include "llvm/Type.h"
22 #include "llvm/Assembly/Writer.h"
23 #include "llvm/CodeGen/AsmPrinter.h"
24 #include "llvm/CodeGen/DwarfWriter.h"
25 #include "llvm/Target/TargetAsmInfo.h"
26 #include "llvm/Target/TargetMachine.h"
27 #include "llvm/Support/Compiler.h"
28 #include "llvm/Support/ErrorHandling.h"
29 #include "llvm/Support/Mangler.h"
30 #include "llvm/Support/raw_ostream.h"
31 #include "llvm/ADT/Statistic.h"
34 STATISTIC(EmittedInsts, "Number of machine instrs printed");
37 struct VISIBILITY_HIDDEN AlphaAsmPrinter : public AsmPrinter {
38 /// Unique incrementer for label values for referencing Global values.
41 explicit AlphaAsmPrinter(raw_ostream &o, TargetMachine &tm,
42 const TargetAsmInfo *T, bool V)
43 : AsmPrinter(o, tm, T, V) {}
45 virtual const char *getPassName() const {
46 return "Alpha Assembly Printer";
48 bool printInstruction(const MachineInstr *MI);
49 void printOp(const MachineOperand &MO, bool IsCallOp = false);
50 void printOperand(const MachineInstr *MI, int opNum);
51 void printBaseOffsetPair (const MachineInstr *MI, int i, bool brackets=true);
52 void printModuleLevelGV(const GlobalVariable* GVar);
53 bool runOnMachineFunction(MachineFunction &F);
54 bool doInitialization(Module &M);
55 bool doFinalization(Module &M);
57 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
58 unsigned AsmVariant, const char *ExtraCode);
59 bool PrintAsmMemoryOperand(const MachineInstr *MI,
62 const char *ExtraCode);
64 } // end of anonymous namespace
66 /// createAlphaCodePrinterPass - Returns a pass that prints the Alpha
67 /// assembly code for a MachineFunction to the given output stream,
68 /// using the given target machine description. This should work
69 /// regardless of whether the function is in SSA form.
71 FunctionPass *llvm::createAlphaCodePrinterPass(raw_ostream &o,
74 return new AlphaAsmPrinter(o, tm, tm.getTargetAsmInfo(), verbose);
77 #include "AlphaGenAsmWriter.inc"
79 void AlphaAsmPrinter::printOperand(const MachineInstr *MI, int opNum)
81 const MachineOperand &MO = MI->getOperand(opNum);
82 if (MO.getType() == MachineOperand::MO_Register) {
83 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
85 O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
86 } else if (MO.isImm()) {
88 assert(MO.getImm() < (1 << 30));
95 void AlphaAsmPrinter::printOp(const MachineOperand &MO, bool IsCallOp) {
96 const TargetRegisterInfo &RI = *TM.getRegisterInfo();
98 switch (MO.getType()) {
99 case MachineOperand::MO_Register:
100 O << RI.get(MO.getReg()).AsmName;
103 case MachineOperand::MO_Immediate:
104 LLVM_UNREACHABLE("printOp() does not handle immediate values");
107 case MachineOperand::MO_MachineBasicBlock:
108 printBasicBlockLabel(MO.getMBB());
111 case MachineOperand::MO_ConstantPoolIndex:
112 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
116 case MachineOperand::MO_ExternalSymbol:
117 O << MO.getSymbolName();
120 case MachineOperand::MO_GlobalAddress:
121 O << Mang->getMangledName(MO.getGlobal());
124 case MachineOperand::MO_JumpTableIndex:
125 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
126 << '_' << MO.getIndex();
130 O << "<unknown operand type: " << MO.getType() << ">";
135 /// runOnMachineFunction - This uses the printMachineInstruction()
136 /// method to print assembly for each instruction.
138 bool AlphaAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
141 SetupMachineFunction(MF);
144 // Print out constants referenced by the function
145 EmitConstantPool(MF.getConstantPool());
147 // Print out jump tables referenced by the function
148 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
150 // Print out labels for the function.
151 const Function *F = MF.getFunction();
152 SwitchToSection(TAI->SectionForGlobal(F));
154 EmitAlignment(MF.getAlignment(), F);
155 switch (F->getLinkage()) {
156 default: LLVM_UNREACHABLE( "Unknown linkage type!");
157 case Function::InternalLinkage: // Symbols default to internal.
158 case Function::PrivateLinkage:
160 case Function::ExternalLinkage:
161 O << "\t.globl " << CurrentFnName << "\n";
163 case Function::WeakAnyLinkage:
164 case Function::WeakODRLinkage:
165 case Function::LinkOnceAnyLinkage:
166 case Function::LinkOnceODRLinkage:
167 O << TAI->getWeakRefDirective() << CurrentFnName << "\n";
171 printVisibility(CurrentFnName, F->getVisibility());
173 O << "\t.ent " << CurrentFnName << "\n";
175 O << CurrentFnName << ":\n";
177 // Print out code for the function.
178 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
180 if (I != MF.begin()) {
181 printBasicBlockLabel(I, true, true);
184 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
186 // Print the assembly for the instruction.
188 if (!printInstruction(II)) {
189 LLVM_UNREACHABLE("Unhandled instruction in asm writer!");
194 O << "\t.end " << CurrentFnName << "\n";
196 // We didn't modify anything.
200 bool AlphaAsmPrinter::doInitialization(Module &M)
202 if(TM.getSubtarget<AlphaSubtarget>().hasCT())
203 O << "\t.arch ev6\n"; //This might need to be ev67, so leave this test here
205 O << "\t.arch ev6\n";
206 O << "\t.set noat\n";
207 return AsmPrinter::doInitialization(M);
210 void AlphaAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
211 const TargetData *TD = TM.getTargetData();
213 if (!GVar->hasInitializer()) return; // External global require no code
215 // Check to see if this is a special global used by LLVM, if so, emit it.
216 if (EmitSpecialLLVMGlobal(GVar))
219 std::string name = Mang->getMangledName(GVar);
220 Constant *C = GVar->getInitializer();
221 if (isa<MDNode>(C) || isa<MDString>(C))
223 unsigned Size = TD->getTypeAllocSize(C->getType());
224 unsigned Align = TD->getPreferredAlignmentLog(GVar);
226 // 0: Switch to section
227 SwitchToSection(TAI->SectionForGlobal(GVar));
229 // 1: Check visibility
230 printVisibility(name, GVar->getVisibility());
233 switch (GVar->getLinkage()) {
234 case GlobalValue::LinkOnceAnyLinkage:
235 case GlobalValue::LinkOnceODRLinkage:
236 case GlobalValue::WeakAnyLinkage:
237 case GlobalValue::WeakODRLinkage:
238 case GlobalValue::CommonLinkage:
239 O << TAI->getWeakRefDirective() << name << '\n';
241 case GlobalValue::AppendingLinkage:
242 case GlobalValue::ExternalLinkage:
243 O << TAI->getGlobalDirective() << name << "\n";
245 case GlobalValue::InternalLinkage:
246 case GlobalValue::PrivateLinkage:
249 LLVM_UNREACHABLE("Unknown linkage type!");
252 // 3: Type, Size, Align
253 if (TAI->hasDotTypeDotSizeDirective()) {
254 O << "\t.type\t" << name << ", @object\n";
255 O << "\t.size\t" << name << ", " << Size << "\n";
258 EmitAlignment(Align, GVar);
262 EmitGlobalConstant(C);
266 bool AlphaAsmPrinter::doFinalization(Module &M) {
267 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
269 printModuleLevelGV(I);
271 return AsmPrinter::doFinalization(M);
274 /// PrintAsmOperand - Print out an operand for an inline asm expression.
276 bool AlphaAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
278 const char *ExtraCode) {
279 printOperand(MI, OpNo);
283 bool AlphaAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
286 const char *ExtraCode) {
287 if (ExtraCode && ExtraCode[0])
288 return true; // Unknown modifier.
290 printOperand(MI, OpNo);
295 // Force static initialization.
296 extern "C" void LLVMInitializeAlphaAsmPrinter() { }
299 static struct Register {
301 AlphaTargetMachine::registerAsmPrinter(createAlphaCodePrinterPass);